JUKI LU-2810-7 (01) PDF MANUAL


Post questions, comments, reviews or errors in the comment box below.

Your File is Ready … Download PDF

CLICK HERE TO DOWNLOAD JUKI LU-2810-7 (01) PDF MANUAL


PDF Content Summary: LU-2810, 2810-7, 2860, 2860-7, 2818-7, 2868-7 INSTRUCTION MANUAL CONTENTS 1. SPECIFICATIONS ............................................................................................................ 1 2. INSTALLATION ................................................................................................................ 4 2-1. Installation of the sewing machine ....................................................................................................4 2-2. Installing the belt cover and the belt (LU-2810, LU-2860) ...............................................................7 2-3. Adjusting the belt tension (LU-2810, LU-2860) .................................................................................7 2-4. Installing the oil shield .......................................................................................................................8 2-5. Pneumatic components (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) .......................................8 2-6. Installing the thread stand ...............................................................................................................10 2-7. Installing the thread guide pin ......................................................................................................... 11 3. PREPARATION OF THE SEWING MACHINE .............................................................. 12 3-1. Lubrication ......................................................................................................................................... 12 3-2. Attaching the needle ......................................................................................................................... 14 3-3. Attaching and removing the bobbin ................................................................................................15 3-4. Threading the hook ...........................................................................................................................15 3-5. Winding a bobbin .............................................................................................................................. 16 3-6. Threading the machine head ...........................................................................................................17 3-7. How to set the model of the machine head ....................................................................................19 3-8. Adjusting the machine head (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) ...................................... 21 4. ADJUSTING THE SEWING MACHINE ......................................................................... 23 4-1. Adjusting the stitch length ...............................................................................................................23 4-2. Thread tension ..................................................................................................................................24 4-3. Thread take-up spring ......................................................................................................................25 4-4. Adjusting the pressure of the presser foot .....................................................................................26 4-5. Needle-to-hook relation .................................................................................................................... 27 4-6. Adjusting the hook needle guard ....................................................................................................28 4-7. Adjusting the bobbin case opening lever .......................................................................................29 4-8. Adjusting the position of counter knife, knife pressure and clamp pressure .............................30 4-9. Adjusting the condensation stitch (LU-2818-7, LU-2868-7) ...........................................................31 4-10. Adjusting the amount of the alternating vertical movement of the walking foot and the presser foot .......................................................................................................................................32 5. OPERATION OF THE SEWING MACHINE ................................................................... 32 5-1. Hand lifter ..........................................................................................................................................32 5-2. Resetting the safety clutch ..............................................................................................................33 5-3. Adjusting the automatic presser foot lifter .....................................................................................34 5-4. Fixing the feed adjusting dial ...........................................................................................................35 5-5. How to change the maximum stitch length (LU-2818-7, LU-2868-7) ............................................37 5-6. Normal-/reverse-feed stitch needle entry points alignment at the time of automatic reverse feed stitching (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) .......................................................38 5-7. Operation switches (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) .............................................39 5-8. Knee switch .......................................................................................................................................41 5-9. Function setting for the SC-922 (LU-2818-7, LU-2868-7) ...............................................................44 6. SEWING SPEED TABLE ............................................................................................... 45 7. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860) ................................................... 45 8. TROUBLES IN SEWING AND CORRECTIVE MEASURES ......................................... 46 i 1. SPECIFICATIONS No. Item Application 1 Model LU-2810 LU-2860

2 Model name 1-needle, unison-feed, lockstitch machine 2-needle, unison-feed, lockstitch machine

3 Application Medium- to heavy-weight materials, car seat, furniture

4 Sewing speed Max. 3,000 sti/min (See "6. SEWING SPEED TABLE" p.45.) Max. 2,700 sti/min (See "6. SEWING SPEED TABLE" p.45.)

5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160) 6 Applicable thread size for sewing #30 to #5 7 Stitch length Max. 9 mm (forward/reverse feed) 8 Stitch length dial 1-pitch dial 9 Presser foot lift Hand lifter : 10 mm By knee lifter : 20 mm

10 Stitch length adjusting mechanism By dial

11 Reverse stitch adjusting method By lever 12 Thread take-up Link thread take-up 13 Needle bar stroke 40 mm

14 Amount of the alternate vertical movement 1 mm to 9 mm (Alternate vertical dial adjustment type)

15 Hook Full-rotary vertical-axis 2-fold hook (Latch type) 16 Feed mechanism Box feed

17 Top and bottom feed actuation mechanism Timing belt

18 Lubrication Automatic lubrication by oil tank (with oil gauge) 19 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7) or JUKI MACHINE OIL No. 7 20 Bed size 643 mm × 178 mm 21 Space under the arm 347 mm × 127 mm 22 Hand wheel size Effective diameter of the V belt section : ø76.0 mm Outer diameter : ø140 mm 23 Motor/Control box M51N 750W / SC-922A 24 Machine head weight 56 kg 61 kg

25 Noise - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 83.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 3,000 sti/ min. - Sound power level (LWA); A-weighted value of 88.5 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 3,000 sti/min. - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 83.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 2,700 sti/ min. - Sound power level (LWA); A-weighted value of 88.5 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 2,700 sti/min. – 1 –

No. Item Application 1 Model LU-2810-7 LU-2860-7

2 Model name 1-needle, unison-feed, lockstitch machine with automatic thread trimmer 2-needle, unison-feed, lockstitch machine with automatic thread trimmer

3 Application Medium- to heavy-weight materials, car seat, furniture

4 Sewing speed Max. 3,000 sti/min (See "6. SEWING SPEED TABLE" p.45.) *1 Max. 2,700 sti/min (See "6. SEWING SPEED TABLE" p.45.) *1

5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160) 6 Applicable thread size for sewing #30 to #5 7 Applicable thread size to be cut #30 to #5 8 Stitch length Max. 9 mm (forward/reverse feed) 9 Stitch length dial 2-pitch dial 10 Presser foot lift Hand lifter : 10 mm Automatic presser foot lifter : 20 mm

11 Stitch length adjusting mechanism By dial

12 Reverse stitch adjusting method Air cylinder type (with touch-back switch) 13 Thread take-up Link thread take-up 14 Needle bar stroke 40 mm

15 Amount of the alternate vertical movement 1 mm to 9 mm (Alternate vertical dial adjustment type)

16 Hook Full-rotary vertical-axis 2-fold hook (Latch type) 17 Feed mechanism Box feed

18 Top and bottom feed actuation mechanism Timing belt

19 Thread trimming method Cam-driven scissors type 20 Lubrication Automatic lubrication by oil tank (with oil gauge) 21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7) or JUKI MACHINE OIL No. 7 22 Bed size 643 mm × 178 mm 23 Space under the arm 347 mm × 127 mm 24 Hand wheel size Outer diameter : ø123 mm 25 Motor/Control box SC-922B 26 Machine head weight 61 kg 66 kg 27 Rated power consumption 180VA 110VA

28 Noise - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 83.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 3,000 sti/ min. - Sound power level (LWA); A-weighted value of 88.5 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 3,000 sti/min. - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 83.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 2,700 sti/ min. - Sound power level (LWA); A-weighted value of 88.5 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 2,700 sti/min.

*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser foot is automatically carried out. – 2 – No. Item Application 1 Model LU-2818-7 LU-2868-7

2 Model name 1-needle, unison-feed, lockstitch machine with automatic thread trimmer (with 2.7-fold vertical axis hook/long pitch type) 2-needle, unison-feed, lockstitch machine with automatic thread trimmer (with 2.7-fold vertical axis hook/long pitch type)

3 Application Medium- to heavy-weight materials, car seat, furniture

4 Sewing speed Max. 3,000 sti/min (See "6. SEWING SPEED TABLE" p.45.) *1 Max. 2,700 sti/min (See "6. SEWING SPEED TABLE" p.45.) *1

5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160) 6 Applicable thread size for sewing #30 to #5 7 Applicable thread size to be cut #30 to #5 8 Stitch length Max. 12 mm (forward/reverse feed) 9 Stitch length dial 2-pitch dial 10 Presser foot lift Hand lifter : 10 mm Automatic presser foot lifter : 20 mm

11 Stitch length adjusting mechanism By dial

12 Reverse stitch adjusting method Air cylinder type (with touch-back switch) 13 Thread take-up Link thread take-up 14 Needle bar stroke 40 mm

15 Amount of the alternate vertical movement 1 mm to 9 mm (Alternate vertical dial adjustment type)

16 Hook Full-rotary vertical-axis 2.7-fold hook (Latch type) 17 Feed mechanism Box feed

18 Top and bottom feed actuation mechanism Timing belt

19 Thread trimming method Cam-driven scissors type 20 Lubrication Automatic lubrication by oil tank (with oil gauge) 21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7) or JUKI MACHINE OIL No. 7 22 Bed size 643 mm × 178 mm 23 Space under the arm 347 mm × 127 mm 24 Hand wheel size Outer diameter : ø123 mm 25 Motor/Control box SC-922B 26 Machine head weight 66 kg 68.5 kg 27 Rated power consumption 120 VA 110 VA

28 Noise - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 84.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 2,750 sti/ min. - Sound power level (LWA); A-weighted value of 84.0 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 3,000 sti/min. - Equivalent continuous emission sound pressure level (LpA) at the workstation: A-weighted value of 84.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 11204 GR2 at 2,600 sti/ min. - Sound power level (LWA); A-weighted value of 84.0 dB; (Includes KWA = 2.5 dB); according to ISO 10821- C.6.2 - ISO 3744 GR2 at 2,700 sti/min.

*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser foot is automatically carried out. – 3 –

Sheet B Sheet CSheet A ❹ ❶ ❷ bers of the machine head Place sheets A and B (standard: three pieces) and C (standard: one piece) between hinge seat ❶ and machine head support rubbers ❷ and ❸. Then, fix them on the table with nail. Use nail ❺ for sheet C. Use nail ❹ for other sheets. There are two different machine head support rubbers ❸ ; i.e., the rubber for the right and that for the left. Be sure to check the types of the support rubbers before fixing them. Be sure to use a short nail ❺ for sheet C. If long nail ❹ is used, the nail tip can pene- trate the table giving rise to a risk of injury. ❸ ❺ ❺ ❸ ❸ bers of the machine head Place sheets A and B (standard: three pieces) and C (standard: one piece) between hinge seat ❶ and machine head support rubbers ❷ and ❸. Then, fix them on the table with nail. Use nail ❺ for sheet C. Use nail ❹ for other sheets. There are two different machine head support rubbers ❸ ; i.e., the rubber for the right and that for the left. Be sure to check the types of the support rubbers before fixing them. bers of the machine head Place sheets A and B (standard: three pieces) and C (standard: one piece) between hinge seat ❶ and machine head support rubbers ❷ and ❸. Then, fix them on the table with nail. Use nail ❺ for sheet C. Use nail ❹ for other sheets. There are two different machine head support rubbers ❸ ; i.e., the rubber for the right and that for the left. Be sure to check the types of the support rubbers before fixing them. bers of the machine head Place sheets A and B (standard: three pieces) and C (standard: one piece) between hinge seat ❶ and machine head support rubbers ❷ and ❸. Then, fix them on the table with nail. Use nail ❺ for sheet C. Use nail ❹ for other sheets. There are two different machine head support rubbers ❸ ; i.e., the rubber for the right and that for the left. Be sure to check the types of the support rubbers before fixing them.

2. INSTALLATION 2-1. Installation of the sewing machine 1) To prevent possible accidents caused by the full of the sewing machine, perform the work by two persons or more when the machine is moved. Do not hold the pulley and the reverse feed lever. 2) Do not put protruding articles such as the screwdriver and the like at the location where the sewing machine is placed.

Sheets A and B (eight pieces each) and sheets C (four pieces) are supplied with the machine as accessories. For the sheets A and B, three sheets are to be used as standard for each mounting position. For the sheet C, one sheet is to be used as standard. (The state shown in the left figure) The sheets A, B and C are used for adjust- ing the height of the top surface of the bed. Use one more sheet to increase the height, or use only one sheet to decrease it. ❹ 25 mm ❺ ❺ 19 mm 19 mm – 4 –

3) Attaching the hinge seats and the support rub- Operator’s side Table ❼ ❽ Top surface ❺ Align ❺ Align Multi-layered part ❻ – 5 –6) Install hinge ❼ on the bed with screw ❽ . En- gage the hinge with the rubber hinge of the table. Then, place the machine head on the machine head support rubber. 5) Attach a filter ❻ to the oil pan ❺ as shown in the figure. Install filter ❻ so that its multi-layered part is brought to the right side as observed from you. 4) Attaching the oil pan Fix the oil pan ❺ supplied with the machine on the table by tightening ten wood screws.

❺ ❾ A – 6 – pan ❺ . Secure the pipe in groove . 9) Fix filter and filter clamp with fitting . head on the frame. 11) Install bracket on CP panel with screws supplied with the panel. 12) Install bracket on spacer with screws supplied with the machine head and washers supplied with the panel. Do not use the screws supplied the panel instead of screws supplied with the ma- chine head. When it is really necessary to conduct work with the machine head supporting rod re- moved for the purpose of maintenance and repair, it is necessary to carry out the work with two or more persons. In the case the machine head is tilted more than necessary, oil can leak from the oil in- let of the oil tank. It is, therefore, necessary to remove oil from the oil tank before tilting the machine head.

8) Put reflux pipe in the oil reservoir A of oil 10) Mount spacers supplied with the machine 7) Securely attach head support rod ❾ until its rib is closely pressed against the table. * Accessory screw supplied with the machine head: Thread diameter M5; Length: 8 mm 2-2. Installing the belt cover and the belt (LU-2810, LU-2860) ❷ V-belt When the sewing machine is used, covers ❶ and ❷ must be installed without fail. Handwheel 2-3. Adjusting the belt tension (LU-2810, LU-2860) WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 15mm 9.8N Motor pulley ❶ – (Installation procedure) 1) Put the V-belt on the sewing machine pulley. 2) Install belt cover ❶ on the machine arm. 3) Install belt cover B ❷ on the table. 4) Mount the handle section of the pulley with a screw. Adjust the belt tension with the height of the motor so that the belt sags 15 mm when the center of V belt is applied with a 9.8 N load. 7 – LU-2810, LU-2810-7, LU-2818-7 LU-2860, LU-2860-7, LU-2868-7 2-4. Installing the oil shield 2-5. Pneumatic components (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (1) Installing the regulator 1) Install regulator (asm.) ❶ on mounting plate ❺ with screw ❷ , spring washer ❸ and nut ❹ which are supplied with the unit. 2) Install couplings ❻ and ❼ on regulator ❶ . 3) Attach mounting plate ❺ on the undersurface of the table with accessory screws ❽ supplied with the plate. 4) Connect ø6 air tube coming from the sewing machine to coupling ❻ . ❷ ❶❷ WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❽ ❺ ❷ ❸ ❼ ❻ ❹ ❶ ❶ ❷ – 8 –Install oil shield ❶ , supplied with the unit, on the frame with screws ❷ .

Decrease Increase (3) Exhaust tube 1) The operating air pressure is 0.5 to 0.55 MPa. Pass ø8 exhaust tube ❶ coming from the sew- ing machine through hole ❷ in the table. In the case of high humidity, water may flow out from the exhaust tube. ❶ ❷ ❶❷A – 9 – Adjust the air pressure using air pressure regu- lating knob ❶ of the filter regulator. 2) In the case fluid accumulation is observed in A section of the filter regulator, turn drain cock ❷ to drain the fluid.

(2) Adjusting the air pressure

2-6. Installing the thread stand LU-2810, LU-2810-7, LU-2818-7 LU-2860, LU-2860-7, LU-2868-7 ❶ ❶ – 10 – Assemble the thread stand, set it up on the machine table using the installation hole in the table and tight- en nut ❶ gently.

2-7. Installing the thread guide pin LU-2810, LU-2810-7, LU-2818-7 ❷ ❶ LU-2860, LU-2860-7, LU-2868-7❷ ❶ – 11 –Insert needle thread guide pin ❶ into the corre- sponding hole in top cover ❷ . ・ LU-2810, LU-2810-7, LU-2818-7: One needle thread guide pin ・ LU-2860, LU-2860-7, LU-2868-7: Two needle thread guide pins LU-2810, LU-2810-7 LU-2860, LU-2860-7 C ❶ BA ❷ LU-2818-7, LU-2868-7 ■ Lubrication procedure Fill the oil tank with oil before operating the sewing machine. 1) Fill the oil tank with JUKI NEW DEFRIX OIL No.1 (Part No. : MDFRX1600C0) or JUKI MA- CHINE OIL #7 (Part No. : MML007600CA) using the oiler supplied with the machine from section C. 2) Fill the oil tank with the oil until the top end of oil amount indicating rod ❷ comes between the upper engraved marker line A and the lower engraved marker line B of oil amount indicating window ❶ . If the oil is filled excessively, it will leak from the air vent hole in the oil tank or proper lubrication will be not performed. In addition, when the oil is vigorously filled, it may overflow from the oil hole. So, be careful. 3) When you operate the sewing machine, refill

3. PREPARATION OF THE SEWING MACHINE 3-1. Lubrication 1. When using a new sewing machine for the first time or using the sewing machine which has not been used for a long time, run in the sewing machine at a sewing speed of 1,000 sti/min or less and check the oil quantity in the hook before use. If the quantity of oil in the hook is insufficient, adjust the quantity of oil by turning the oil quantity adjusting screw counterclockwise to ensure that the oil quantity in the hook is adequate. After that, adjust the quantity of oil to the adequate one. (Refer to "■ Adjusting the oil quantity in the hook" p.13.) 2. For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MDFRX1600C0) or JUKI MACHINE OIL #7 (Part No. : MML007600CA). 3. Be sure to lubricate clean oil. WARNING : 1. Do not connect the power plug until the lubrication has been completed so as to prevent accidents due to abrupt start of the sewing machine. 2. To prevent the occurrence of an inflammation or rash, immediately wash the related portions if oil adheres to your eyes or other parts of your body. 3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children cannot reach.

C – 12 – oil if the top end of oil amount indicating rod ❷ comes down to the lower engraved marker line B of oil amount indicating window ❶ .

❶ ❷ A sheet of paper ❸ ❸ ❷ A B D ❹❺❻ – ■ Adjusting the oil quantity in the hook LU-2810, LU-2810-7, LU-2818-7 1) Remove rubber cap ❶ . 2) Loosen nut ❷ and turn oil amount adjustment screw ❸ to adjust the amount of oil in the hook. Turning the screw clockwise A will decrease the amount of oil in the hook or counterclockwise B will increase it. 3) The appropriate amount of oil, when a sheet of paper is placed near the periphery of the hook, ❶ is to such an extent that splashes of oil from the hook appear in approximately five seconds as shown in the figure on the left. ❹❺ C 13 – ■ Cleaning the oil filter 1) Loosen fastening plate ❶ on the back-flow side. Remove oil filter joint (asm.) ❷ on the back-flow side. 2) Clean up filters ❸ , ❹ and ❺ and oil reservoir ❻ of the oil pan. Be sure to clean up the oil reservoir of the oil pan and the filter case approximately once a month. If the filter is clogged with soil, lubrication fails resulting in trouble. In the case the oil quantity in the hook can- not be adjusted to the proper quantity, it should be adjusted by loosening nut ❹ and turning oil quantity adjusting screw ❺ . The oil quantity in the hook is increased by turn- ing the oil quantity adjusting screw coun- terclockwise C, or is decreased by turning it clockwise D. Also check to be sure that the oil is fed to the hook at the sewing speed of 1,000 sti/min.

WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest.

LU-2810, LU-2810-7, LU-2818-7 LU-2860, LU-2860-7, LU-2868-7 D 3-2. Attaching the needle ❷ ❷ In the case the oil quantity in the hook cannot be adjusted to the proper quantity, it should be ad- justed by loosening nut ❺ and turning oil quantity adjusting screw ❻ . The oil quantity in the hook is increased by turning the oil quantity adjusting screw coun- terclockwise C, or is decreased by turning it clockwise D. Also check to be sure that the oil is fed to the hook at the sewing speed of 1,000 sti/min. Long groove ❶❷ B ❺❻ ❺❻ C Switch "off" the motor. Use 135x17 needles. 1) Turn the handwheel to bring the needle bar to the highest position of its stroke. 2) Loosen needle clamp screw ❷ . Hold the nee- dle so that the long groove on needle ❶ faces directly to the right for the LU-2810, 2810-7 and 2818-7, and so that the long groove on each the two needles faces inward for the LU-2860, 2860- 7 and 2868-7. 3) Push needle ❶ deep into the needle clamp hole the highest position of its stroke. 2) Loosen needle clamp screw ❷ . Hold the nee- dle so that the long groove on needle ❶ faces directly to the right for the LU-2810, 2810-7 and 2818-7, and so that the long groove on each the two needles faces inward for the LU-2860, 2860- 7 and 2868-7. 3) Push needle ❶ deep into the needle clamp hole When replacing the needle, check the clear- ance provided between the needle and the blade point of hook. (Refer to "4-5. Needle- to-hook relation" p.27 and "4-6. Adjusting the hook needle guard" p.28.) If there is no clearance, the needle and the hook will be damaged. ❶ A sheet of paper ❶ ❶ Long groove A ❸❹ – 14 – When replacing the needle, check the clear- ance provided between the needle and the blade point of hook. (Refer to "4-5. Needle- to-hook relation" p.27 and "4-6. Adjusting the hook needle guard" p.28.) If there is no clearance, the needle and the hook will be damaged. When replacing the needle, check the clear- ance provided between the needle and the blade point of hook. (Refer to "4-5. Needle- to-hook relation" p.27 and "4-6. Adjusting the hook needle guard" p.28.) If there is no clearance, the needle and the hook will be damaged. justment screw ❹ to adjust the amount of oil in the hook. Turning the screw clockwise A will de- crease the amount of oil in the hook or counterclockwise B will increase it. 3) The appropriate amount of oil, when a sheet of paper is placed near the pe- riphery of the hook, is to such an extent that splashes of oil from the hook ap- pear in approximately five seconds as shown in the figure on the left.

until it will go no further. 4) Tighten needle clamp screw ❷ firmly.

❷ LU-2860, LU-2860-7, LU-2868-7 1) Adjust distribution board ❶ to adjust the oil quantity in the left hook or distri- bution board ❷ to adjust the oil quanti- ty in the right hook as described below. 2) Loosen nut ❸ and turn oil amount ad-

LU-2810, LU-2860 ❷ LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7 1) Pass the thread through thread path ❶ in the inner hook and thread hole ❷ in the lever, and slowly draw the thread. Now, the thread passes under the tension spring. 2) Make sure that the bobbin revolves in the direc- tion of the arrow when you draw the thread. 3-3. Attaching and removing the bobbin 3-4. Threading the hook WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❶ ❷ ❶ ❶ – 1) Lift latch ❶ of hook, and take out the bobbin. 2) Put the bobbin into the shaft in the hook correct- ly and release the latch. 1. Do not make the machine run idle with the bobbin (bobbin thread). The bobbin thread is caught in the hook. As a result, the hook may be damaged. 2. Be careful so as not to get hurt with the top end of the counter knife. 1) Pass the thread through thread path ❶ in the inner hook and between ❷ the opener and in- ner hook, and slowly draw the thread. Now, the thread passes under the tension spring. 2) Make sure that the bobbin revolves in the direc- tion of the arrow when you draw the thread. 15 – 3-5. Winding a bobbin ❶ ❻ ❽ ❼ ❹ ❸ ❷ ❺ – 16 – clamp ❺ is reached. Then, trim the thread. (The thread end is retained under the looper thread clamp.) 3) Load a bobbin on bobbin winder shaft ❻ . 4) Press bobbin winder lever ❼ in the direction of justed by loosening setscrew ❽. The bob- bin thread winding amount is increased by moving bobbin wider lever ❼ upward. 2. If the thread comes off the thread tension controller, wind the thread on the interme- diate thread guide by one turn. controller, wind the thread on the interme- diate thread guide by one turn. controller, wind the thread on the interme- diate thread guide by one turn. controller, wind the thread on the interme- diate thread guide by one turn. 1. This is the one-touch type bobbin wind- er. When the bobbin is fully wound with thread, bobbin thread clamp ❺ automati- cally returns to the initial position. 2. To terminate bobbin winding before the 1. This is the one-touch type bobbin wind- er. When the bobbin is fully wound with thread, bobbin thread clamp ❺ automati- cally returns to the initial position. 2. To terminate bobbin winding before the

1) Pass the thread through sections ❶ to ❹ in the numerical order. 2) Put the thread until the root of bobbin thread the arrow. 5) When you start the sewing machine, the bobbin rotates to automatically wind the thread on itself. 6) When the bobbin is filled up, the bobbin winder lever automatically releases the bobbin and the bobbin winder stops running. 1. The bobbin thread winding amount is ad- bobbin is fully wound with thread, turn the handwheel, while slightly lifting bobbin winder lever ❼ , to bring bobbin thread clamp ❺ back to its initial position. 3. If the thread is not brought to the root of the bobbin thread clamp, the thread slips off the bobbin at the beginning of bobbin winding. [LU-2810, 2810-7, 2818-7] WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 3-6. Threading the machine head ❶ Thread the machine head following the order as illustrated in the figure. * Pass thread through the right side of thread guide . LU-2810-7 LU-2818-7 1. Thread guide is necessary to prevent the thread from slipping off the needle eyelet when per- forming thread trimming at a position which is outside the material. 2. If thread tangling failure occurs when starting sewing from the material edge, the thread should be removed from the location where it is clamped with the spring of thread guide , or thread guide should be changed with another one. The replacement thread guide is separately available. Part number of replacement thread guide: 40084142 LU-2810 ❾ ❽ ❷ ❸ ❹ ❻ ❼ ❺ – 17 – ❺ ❻ ❹ ❸ ❼ [LU-2860, 2860-7, 2868-7] WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Left-hand needle thread LU-2860-7 LU-2868-7 LU-2860 1. Thread guide is necessary to prevent the thread from slipping off the needle eyelet when per- forming thread trimming at a position which is outside the material. 2. If thread tangling failure occurs when starting sewing from the material edge, the thread should be removed from the location where it is clamped with the spring of thread guide , or thread guide should be changed with another one. The replacement thread guide is separately available. Part number of replacement thread guide: 40084142 ❷ ❾ ❸ ❹❺ ❻ ❼ ❽ Right-hand needle thread – 18 – Thread the machine head following the order as illustrated in the figure. ❻❸ ❸ ❹ ❹❺ ❻❺ ❶ ❶ ❼ • CP-18 2) The type of machine head can be se-

lected by pressing 3-7. How to set the model of the machine head ❻ ❺ ❹ ❸ switch ❺ ( ❻ ❺ ❹ ❸ ❻ ❺ ❹ ❸ – 19 – 1) Call Function Setting No. 95 in refer- Model Indication LU-2810 LU81 LU-2860 LU86 LU-2810-7 L81d LU-2860-7 L86d LU-2818-7 L81L LU-2868-7 L86L

ence to "III-6. Function Setting of SC-922" in the Instruction Manual for the SC-922. switch ❻ ). Select the model of the machine head according to the table shown below. 3) After selecting the type of machine

head, by pressing switch ❸ (

switch ❹ ), the step proceeds to 94 or 96, and the display automatically changes to the contents of the setting corresponding with the type of ma- chine head. 4) Turn the power OFF. • CP-180 3) After selecting the type of machine head, by pressing switch ❷ , the step proceeds to 96 or 94, and the display automatically initializes to the contents of the setting corresponding with the type of machine head. 4) Turn the power OFF. ❷ ❶ – 1) Refer to "18. FUNCTION SETTING SWITCH" in the Instruction Manual for the CP-180, and call the function setting No. 95. 2) The type of machine head can be selected by pressing switch ❶ . Select the model of the machine head accord- ing to the table shown below. Model Indication LU-2810 LU81 LU-2860 LU86 LU-2810-7 L81d LU-2860-7 L86d LU-2818-7 L81L LU-2868-7 L86L 20 – • CP-18 3-8. Adjusting the machine head (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) A 1) Simultaneously pressing ❸ ❹ ❺ ❻ ❸ ❹ ❺ ❻ ❸ ❹ ❺ ❻ B ❽ ❼ When checking the adjustment result, set "Function setting No. 90; Initial sewing machine movement function" at "1: Initial operation - Sewing machine stops with its needle up". Then, check whether or not marker dot ❼ is aligned with marker line ❽ . If they are not aligned, carry out the adjustment again. After checking the adjustment result, return the setting of No. 90 to the previous setting. (Initial value is "2. Initial operation: Sewing machine turns in the reverse direction and stop with its needle up".) For the function setting procedure, refer to "III-6. How to set the functions of the SC-922" in the Instruc- tion Manual for the SC-922. – 21 – switch ❹ and switch ❺ , turn ON the power switch. 2) is displayed A in the indicator and the mode is changed over to the adjustment mode. 3) Turn the pulley of the machine head by hand until the main-shaft reference sig- nal is detected. At this time, the degree of an angle from the main-shaft refer- ence signal is displayed on the indicator B. (The value is the reference value.) 4) In this state, align one of the marker dots ❼ on the pulley with marker line ❽ on the pulley cover as shown in the figure. 5) Press switch ❻ to finish the adjust- ment work. (The value is the reference value.) 6) Turn the power OFF. • CP-180 2) is displayed A in the indicator and the mode is changed over to the adjustment mode. 3) Turn the pulley of the machine head by hand until the main-shaft reference signal is detected. At this time, the degree of an angle from the main-shaft reference signal is displayed on the indicator B. (The value is the reference value.) 4) In this state, align one of the marker dots ❼ on the pulley with marker line ❽ on the pulley cov- er as shown in the figure. ❽ ❼ 5) Press switch ❹ to finish the adjustment work. (The value is the reference value.) 6) Turn the power OFF. When checking the adjustment result, set "Function setting No. 90; Initial sewing ma- chine movement function" at "1: Initial oper- ation - Sewing machine stops with its needle up". Then, check whether or not marker dot ❼ is aligned with marker line ❽ . If they are not aligned, carry out the adjustment again. After checking the adjustment result, return the setting of No. 90 to the previous setting. (Initial value is "2. Initial operation: Sewing machine turns in the reverse direction and stop with its needle up".) For the function setting procedure, refer to "18. How to set the functions" in the Instruc- tion Manual for the CP-180. ❹ ❷ ❶ B A – 22 – 1) Simultaneously pressing switch ❶ and switch ❷ , turn ON the power switch. 4. ADJUSTING THE SEWING MACHINE 4-1. Adjusting the stitch length ❹ ❺ ❻ ❸❷❸ ❶ – 23 –Turn standard feed adjusting dial ❶ and 2P feed ad- justing dial ❷ to align the desired number with mark- er dot ❸ on the machine dial. (1) Reverse feed stitching 1) Press down reverse feed control lever ❹ . 2) Reverse feed stitches are made as long as you keep pressing the lever down. 3) Release the lever, and the machine will run in the normal feed direction. (2) Manual one-touch reverse feed stitching 1) Press touch-back switch ❺ . 2) Reverse feed stitches are made as long as you keep pressing the lever down. 3) Release the switch, and the machine will run in the normal feed direction. (3) Changing over the stitching pitch (LU-2810-7, 2860-7, 2818-7 and 2868-7) 1) Press stitching pitch changeover switch ❻ to change over the stitch length to the one cor- responding to the scale mark on the 2P feed ad- justing dial. (The LED on the switch lights up.) 1. Set 2P feed adjusting dial ❷ at a value smaller than the value set by standard feed adjusting dial ❶ . 2. Adjust the 2P feed adjusting dial when the stitching pitch changeover switch is placed in OFF. 3. (LU-2810-7, LU-2860-7) Scale mark on the 2P feed adjusting dial smaller than 3 (at which the dial is stopped by the dial stopper) is used for the 0 (zero) alignment of the 2P dial. Scale marks smaller than 3 cannot be used. 4. (LU-2818-7, LU-2868-7) In the case standard stitch dial ❶ is set at a small pitch value, move feed control lever ❹ up and down several times before starting sewing. Refer to "5-7. Operation switches (LU-2810- 7, LU-2860-7, LU-2818-7, LU-2868-7)" p.39 for the details of the 2P device. 4-2. Thread tension WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❸ B A B A CD ❶❷ – (1) Adjusting the needle thread tension 1) Turn thread tension nut No. 1 ❶ clockwise A to shorten the length of thread remaining on the top of needle after thread trimming. Turn the nut counterclockwise B to lengthen it. 2) Turn thread tension nut No. 2 ❷ clockwise C to increase the needle thread tension, or counter- clockwise D to decrease it. Apply the same tension to both of the thread tension nut No. 2. In the case, the length of thread remaining at the needle tip cannot be increased, re- place the spring of tension controller No. 1 with 22945505 which is separately available. (2) Adjusting the bobbin thread tension Turn tension adjustment screw ❸ clockwise A to increase the bobbin thread tension, or counterclock- wise B to decrease it. 24 – 4-3. Thread take-up spring ❸ ❶ ❾ Decrease Increase ❼ ❶ ❸ ❽ ❷ ❹ ❻ ❺ – 25 –(1) When you want to change the stroke of the thread take-up spring 1) Loosen screw ❷ . Adjust thread take-up spring ❶ by moving it in the slot. 2) Loosen screw ❹ . Adjust thread take-up spring ❸ by moving thread take-up spring adjusting plate ❺ along thread take-up spring base ❻ . * The LU-2810, 2810-7 and 2818-7 do not have thread take-up spring ❸ . (2) When you want to change the tension of the thread take-up spring 1) To adjust the tension of thread take-up spring ❶, loosen nut ❼ first. Turn spring shaft ❽ counter- clockwise to increase the tension or clockwise to decrease it. After the adjustment, fix the stud by tightening nut ❼ . 2) To change the tension of thread take-up spring ❸ , loosen screw ❾ first. Turn nut counter- clockwise to increase the tension or clockwise to decrease it. After the adjustment, fix nut by tightening screw ❾ . * The LU-2810, 2810-7 and 2818-7 do not have thread take-up spring ❸ . 4-4. Adjusting the pressure of the presser foot – Turn presser spring regulating dial ❶ clockwise A to B A increase the pressure of the presser foot, or counter- clockwise B to decrease it. ❶ Be sure to operate the sewing machine with the pressure of the presser foot minimized as long as the presser foot securely holds the material. A The adjustable range extends from 38 mm to 60 mm which represents the distance from the upper sur- face A of the arm to presser spring regulating dial ❶. The standard value at the time of shipment is 47 mm. 26 – ❸ 1) Adjust the standard feed adjusting dial to "0". (Caution 1) 2) Loosen hook driving shaft set collar clamping screw ❸ , and turn the handwheel counterclockwise to make the needle bar ascend by 2.3 mm from the lowest position of its stroke. 3) In the state described in 2), align blade point ❶ of the hook with the center of needle ❷ , and tighten hook driving shaft set collar clamping screw ❸ . At this time, a clearance of 1.5 mm is provided be- tween the blade point of the hook and the top end of the needle eyelet. (The hook driving shaft set collar should be flush with end faces C and D of the hook driving shaft.) 4) Loosen setscrews ❹ and ❺ of the hook driving shaft saddle on the top face of the bed. Adjust the clear- ance between the blade point of the hook and the needle to 0.05 to 0.1 mm by moving the hook driving shaft saddle to the right or left to change its position. Then, tighten setscrews ❹ and ❺ . 5) Align the largest scale mark of the standard feed adjusting dial with the marker dot on the machine arm. Check to be sure that the blade point of the hook does not come in contact with the needle. 1. If stitch skipping and thread breakage occur when using elastic thread such as vinylon, adjust the hook timing with the pitch used for sewing. 2. The operation panel could come in contact with the thread stand when tilting the machine head. To protect the relevant parts from contact, shift the thread stand to a position at which the thread stand does not interfere with the control panel. Hook Hook driving shaft driving shaft D setting collar Hook driving shaft C The hook driving shaft setting collar is aligned Left hook with the end face of hook driving shaft D 4-5. Needle-to-hook relation0.05 to 0.1 mm [Only for the LU-2810-7, LU-2860-7, LU-2818-7 and LU-2868-7] To check the needle bar position as described in the aforementioned 2) [i.e., "...the needle bar ascend by 2.3 mm from the lowest position of its stroke"], you may use the display of the main shaft rotation angel under the "machine head adjustment mode" of the SC-922. Increase the numerical value displayed when the needle bar is in its lowest position of its stroke under the "machine head adjustment mode" by 25 degrees of an angle, the needle bar goes up by 2.3 mm. (When the needle bar ascends by 2.3 mm from its lowest position of its stroke, the main shaft rotation angle is 25 degrees of an angle.) * In the case of adjusting the needle-to-hook relation under the "machine head adjustment mode", do not press switch. Refer to "II-10. Adjustment of the machine head" in the Instruction Manual for the SC-922 for the machine head adjustment mode. WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❷❶ Right hook – 27 – Hook driving shaft setting collar ❸ The hook driving shaft setting collar is aligned with the end face of hook driving shaft C ❹ ❺ 0.05 to 0.2 mm 4-6. Adjusting the hook needle guard WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❹ ❶B A❷ a b ❸ – 28 –When a hook has been replaced, be sure to check the position of the hook needle guard. As the standard position of the hook needle guard, hook needle guard ❷ must push the side face of needle ❶ to lean the needle by 0.05 to 0.2 mm away from its straight position. If the state of the hook is not as shown above, fit hexagon wrench ❹ into ❸ of needle guard adjusting screw and adjust as follows: 1) To bend the hook needle guard in direction a, turn the needle guard adjusting screw in direc- tion A. 2) To bend the hook needle guard in direction b, turn the needle guard adjusting screw in direc- tion B. 3) At the final step of procedure, appropriately ad- just the clearance provided between the needle and the hook. 4-7. Adjusting the bobbin case opening lever WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❸ ❷ ❹ ❶A LU-2810, 2810-7, 2818-7 0.7 to 0.9 mm LU-2860, 2860-7, 2868-7 0.9 to 1.1 mm LU-2810, 2810-7 LU-2860, 2860-7, 2818-7, 2868-7 ❼ ❽ ❻ ❺ – 29 –LU-2810, LU-2810-7 1) Turn the handwheel in the normal direction of rotation to bring bobbin case opening lever ❶ to the closest position to inner hook ❷ . 2) Turn inner hook ❷ in the direction of the arrow until stopper ❸ is pressed against the slits in throat plate ❹ . 3) Loosen opener crank setscrew ❺ . Adjust the clearance provided between the bobbin case opening lever and protruding portion A of the inner hook to 0.7 to 0.9 mm. Tighten setscrew ❺ while pressing down bobbin case opening lever crank ❻ . LU-2860, LU-2860-7, LU-2818-7, LU-2868-7 1) Turn the handwheel in the normal direction of rotation to bring bobbin case opening lever ❶ to the closest position to inner hook ❷ . 2) Turn inner hook ❷ in the direction of the arrow until stopper ❸ is pressed against the slits in throat plate ❹ . 3) Loosen setscrews ❼ of the bobbin case open- ing lever sleeve. Adjust the clearance provided between the bobbin case opening lever and protruding portion A of the inner hook to 0.9 to 1.1 mm for the LU-2860, -2860-7 and 2868-7, or to 0.7 to 0.9 mm for the LU-2818-7. Tighten setscrews ❼ while pressing bobbin case opening lever ❶ downward and pressing the bobbin case holding lever sleeve ❽ upward. 1) Move the moving knife ❺ by hand to its forward travel end. • Adjusting the counter knife 2) Loosen counter knife base setscrews ❶ . Adjust the position of the counter knife so that top end of the counter knife ❸ so that it is spaced 1.2 to 1.5 mm from the end face of the throat plate in terms of the lateral direction, and so that it is pressed against the stepped section of hook driving shaft saddle in terms of the longitudinal direction. Then, tighten setscrews ❶ . Loosen counter knife setscrews ❼ . Adjust the distance between the bed slide mounting plane and the counter knife tip to 37 ± 0.1mm for the LU-2810-7 and LU-2860-7, or 34.5 ± 0.1 mm for the LU-2818-7 and LU-2868-7. Then, tighten setscrews ❼ . • Adjusting the knife pressure 3) Loosen setscrews ❷ in the moving knife. Turn the handwheel to move the moving knife and adjust the knife pressure. As the standard adjustment, the knife pressure should be applied from the time when the distance from the top end of the moving knife to the top end of the counter knife is 6 to 7 mm for the LU-2810-7, or 8 to 9 mm for the LU-2860-7, -2818-7 and -2868-7. 1. Adjust the knife pressure in the state that the clamp spring ❹ does not come in contact with the moving knife ❺ (the clamp pressure is not developed). 2. Be sure to carefully prevent from getting injured by the moving knife ❺ , counter knife ❸ , blade point of the hook, etc. • Adjusting the clamp pressure 4) To adjust the clamp pressure, firstly loosen clamp spring setscrew ❻ . Adjust the lateral position of clamp spring so that a clearance of 3.7 ± 0.1 mm is provided between clamp spring ❹ and counter knife ❸ . Then, adjust the longitudinal position of the clamp spring by tightening setscrew ❻ with the clamp spring pressed against the stepped portion of the counter knife base. Check to make sure that the clamp pressure is applied when moving knife ❺ moves to its back end. 4-8. Adjusting the position of counter knife, knife pressure and clamp pressure LU-2810-7, LU-2860-7 LU-2818-7, LU-2868-7 3.7 ± 0.1 mm Strike ❸ ❹❺ 1.2 to 1.5 mm WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❻ LU-2810-7: 6 to 7 mm LU-2860-7: 8 to 9 mm Knife pressure starts to be developed ❼ ❶ ❷ – 30 – Strike 3.7 ± 0.1 mm ❸ ❼ ❹ ❶ ❻ 8 to 9 mm ❺ ❷ 1.2 to 1.5 mm Knife pressure starts to be developed 4-9. Adjusting the condensation stitch (LU-2818-7, LU-2868-7) 1) Place stitch dial plate ❺ at the desired conden-

sation amount. (Pitch 2 in the case of condensation amount of 2 mm) Loosen condensation stitch arm bracket screw ❶ . 2) Push up condensation cylinder ❹ in the di- rection of the arrow. At this time, push down reverse feed control lever ❻ by hand to put the sewing machine in the reverse feed stitching state. In this state, tighten condensation crank clamping screw ❶ at the position where the top end of slot in link ❷ comes in contact with hinge screw ❸ . If the condensation amount is excessively small, the material can be torn depending on the type of seam to cause stitch skip- ping. This can cause a thread trimming fail- ure. ❹❷ ❶ ❸ ❺ Contact

WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❻ – 31 – 4-10. Adjusting the amount of the alternating vertical movement of the walking foot and the presser foot Adjust the amount of the alternating vertical move- ment of the walking foot and the presser foot us- ❶ ing dial ❶ . Turn the dial clockwise to increase the amount of the alternating vertical movement of the walking foot and the presser foot, or counterclock- wise to decrease it. Excluding the 1-needle European gauge type sew- ing machine, the amount of the alternating vertical movement of the walking foot and the presser foot has been factory-limited to 6.5 mm at the time of shipment. To cancel the restriction to the amount of the alter- nating vertical movement of the walking foot and the ❸ presser foot, remove the top cover, loosen setscrews ❷ and shift stopper ❸ to the right. To release the stopper by means of the standard gauge, the presser foot may inter- fere with the walking foot. The presser foot ❷ may also interfere with the needle bar when a heavy-weight material is used. Make sure that the presser foot interferes with neither the walking foot nor the presser bar before operating the sewing machine. 5. OPERATION OF THE SEWING MACHINE 5-1. Hand lifter To lift the presser foot manually, pull hand lifter ❶ in the direction of the arrow. This makes the presser foot rise 10 mm and stay at ❶ that position. – 32 – 5-2. Resetting the safety clutch WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❶ – 33 –The safety clutch functions when an excessive load is applied to the hook or the other components dur- ing sewing. At this time, the hook will never rotate even if turning the handwheel. When the safety clutch has functioned, remove the cause and reset the safety clutch as given in the following procedure. 1) Pressing push button ❶ located on the top surface of the machine bed, strongly turn the handwheel in the reverse direction of rotation. 2) The resetting procedure completes when the handwheel clicks. Turn the handwheel by hand, and confirm that push button ❶ has returned. 3) At the final step of procedure, check the needle- to-hook relation. (Refer to "4-5. Needle-to-hook relation" p.27) 5-3. Adjusting the automatic presser foot lifter ❶

❷ ❸ ❹ For the standard gauge type machine, the top end of the walking foot interferes with the needle bar frame when the auto-lifter is used in the case the amount of the alter- nating vertical movement of the walking foot and the presser foot is set at 2 mm or smaller and in the case it is set at 7 mm or more and the reverse-rotation needle-up is carried out. To use the machine with the amount of the alternating vertical movement of the walking foot and the presser foot set at 2 mm or less, set the lifting amount of the presser foot by means of the auto-lifter at 17 mm or less. For the standard gauge type machine, the top end of the walking foot interferes with the needle bar frame when the auto-lifter is used in the case the amount of the alter- nating vertical movement of the walking foot and the presser foot is set at 2 mm or smaller and in the case it is set at 7 mm or more and the reverse-rotation needle-up is carried out. To use the machine with the amount of the alternating vertical movement of the walking foot and the presser foot set at 2 mm or less, set the lifting amount of the presser foot by means of the auto-lifter at 17 mm or less.

WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 1) Turn the power ON. Carry out thread trimming once. Turn ON the automatic presser lifter. 2) Place a 20 mm spacer ❶ under the presser foot. 3) Turn the power OFF. 4) Remove rubber cap ❷ from the rear face of the machine arm. Loosen setscrew ❸ . 5) Turn presser bar lifting arm ❹ in the direction of the arrow until it will go no further. Then, tighten setscrew ❸ . – 34 – 5-4. Fixing the feed adjusting dial LU-2810, 2810-7, 2860, 2860-7 LU-2810, 2810-7, 2860, 2860-7 ❶ ❷❸❹ ❺ ❻ – 35 – If the feed adjusting dial moves out of the set po- sition when the automatic reverse feed device is operated (LU-2810, 2810-7, 2860, 2860-7): 1) Remove rubber cap ❶ . Tighten screws ❷ . To prohibit the adjustment of the feed adjusting dial (LU-2810, 2810-7, 2860, 2860-7): 1) Remove the motor cover or the belt cover. 2) Insert stopper pin ❺ and screw ❻ in tapped hole ❸ (or holes ❸ and ❹ for the LU-2810-7 and -2860-7) and tighten it. Insert stopper pin ❺ into the tapped hole from its thinner end as illustrated in the figure. Stopper pin ❺ and screw ❻ are separately available. Part number of stopper pin : TA0440401MO Part number of screw : SM8060612TP

LU-2818-7, 2868-7 ❹❷ ❸❶A ❼ ❻ ❼ ❺ – 36 – To prohibit the adjustment of the feed adjusting dial (LU-2818-7, 2868-7): 1) Loosen stitch dial setscrew ❸ (or ❹ ). Remove stitch dial ❶ (or ❷ ) and four washers ❺ . 2) Insert stitch dial ❶ (or ❷ ) back to its original position and push it in direction A. Notch ❻ of the dial fits on projecting sections ❼ of the cover to fix the dial so that it will not turn any further. 3) In the state as described in 2), tighten feed reg- position and push it in direction A. Notch ❻ of the dial fits on projecting sections ❼ of the cover to fix the dial so that it will not turn any further. 3) In the state as described in 2), tighten feed reg- position and push it in direction A. Notch ❻ of the dial fits on projecting sections ❼ of the cover to fix the dial so that it will not turn any further. 3) In the state as described in 2), tighten feed reg- ulating dial setscrews ❸ (or ❹ ) alternately to fix dial ❶ (or ❷ ).

5-5. How to change the maximum stitch length (LU-2818-7, LU-2868-7)

1) Loosen stitch dial setscrew ❶ . Remove stitch dial ❷ . 2) Loosen dial cover setscrew ❸ . Remove dial cover ❹ . ❹ 3) Loosen dial plate setscrew ❺ . Remove dial plate ❻ . ❹ 4) Insert stopper pin ❼ into one of the dial plate holes which corresponds to the desired maxi- mum stitch length until the pin will go no further. Re-attach stitch dial ❷ , dial cover ❹ and dial plate ❻ respectively with setscrews ❶ , ❸ and ❺ . 1. If inserted stopper pin ❼ and tightened Maximum stitch length 10 mm 9 mm setscrew ❺ get loose, apply epoxy adhe- sive to them. 2. Adjust the tightening depth of dial plate setscrew ❺ to allow dial plate ❻ to move smoothly with no backlash. ❸ ❶ ❼ 6 mm 4 mm ❷ ❺ ❻ Stopper pin ❼ is separately available. Part number of stopper pin : PH0400062C0 – 37 –

5-6. Normal-/reverse-feed stitch needle entry points alignment at the time of automatic reverse feed stitching (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) When the sewing speed or stitch pitch is changed, the normal- and reverse-feed stitch needle entry points may not be aligned at the time of automatic reverse feed stitching. In such a case, correct the alignment of needle entry points by changing the ON/OFF timing of the automatic reverse feed cylinder. In the case the stitch pitch is large and correction of the timing is difficult, it is recommended to decrease the reverse feed sewing speed or use the temporary stop function at each corner section of the sewing pattern. Refer to "III-8. Detailed explanation of selection of functions 16 Compensation of timing of the sole- noid for reverse feed stitching" in the Instruction Manual for the SC-922 for detail. Normal- and reverse-feed stitches may need to be adjusted according to the stitch pitch to be used. Refer to the Engineer's Manual for how to adjust the stitches. 1) How to align needle entry points of the reverse feed stitching with those of the normal feed stitching Carry out "correction of the timing of the reverse feed stitching" according to the difference between the needle entry points of the reverse feed stitching and those of the normal feed stitching. Refer to "III-6. Setting the SC-922 functions" in the Instruction Manual for the SC-922 for how to carry out the "correction of the timing of the reverse feed stitching". 1 ON-timing of the reverse feed Sewing starting position stitching at the beginning of sew- ing (Function setting No. 51) Stitch length is smaller Decrease the set value of No. 51. Increase the set value of No. 51. 2 Correction of the OFF-timing of Stitch length is Stitch length is smaller smaller the reverse feed stitching at the beginning of sewing (Function setting No. 52) Decrease the set value of No. 52. Increase the set value of No. 52. 3 Correction of the OFF-timing of the reverse feed stitching at the Stitch length is smaller end of sewing (Function setting No. 53) Sewing end position Sewing end position Decrease the set Increase the set value of No. 53. value of No. 53. 2) Stitch-by-stitch reverse feed stitching speed (Function setting No. 8) and the temporary stop function at each corner section of the sewing pattern (Function No. 151) Default value Recommended value Recommended value Recommended value Stitch pitch (mm) 3 to 6 7 to 8 9 10 to 12 Reverse feed stitching speed (sti/min) 600 500 400 400 Temporary stop function at each corner section of the sewing pattern 0 (OFF) 0 (OFF) 0 (OFF) 1 (ON) – 38 –

If this switch is pressed the amount of the alter- nating vertical movement of the walking foot and the presser foot will be maximized. (Lamp above the switch lights up) Use this switch when a multilayered portion of the sewing product is not smoothly fed. To change over the amount of the alternating vertical movement of the walking foot and the presser foot by means of the knee switch, join the knee switch and the mounting plate, sup- plied with the unit, together and fix them on the table with wood screw. For the wiring, refer to "5-8. Knee switch" p.41. ❷ Automatic reverse feed stitching cancellation/addition switch • If this switch is pressed when the following automatic reverse feed stitching has been specified, the re- verse stitching will not take place (for once immediately after it is pressed). (Example 1) • If this switch is pressed when no automatic reverse feed stitching has been specified, the reverse feed stitching will take place (once immediately after it is pressed). (Example 2) (Example 1) In the case where both automatic reverse feed stitching for start and that for end have been specified : If the (Example 2) In the case where neither automatic reverse feed stitching for start nor that for end have been specified : 5-7. Operation switches (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) switch is pressed during sewing, the automatic reverse feed stitching for end (be- tween C and D) will not be carried out. If the switch is pressed before starting sew- ing, the automatic reverse feed stitching for start (between A and B) will not be carried out. switch is pressed before starting sewing, the automatic reverse feed stitching for start (between A and B) will be carried out. ❶ ❷ ❸ ❹ ❺ ❻ A BC D C D – ❶ Alternating vertical movement amount change-over switch If the A B C D 39 –If the switch is pressed during sewing, the automatic reverse feed stitching for end (be- tween C and D) will be carried out. A BC D A B

❸ Needle lifting switch ❺ Needle thread tension changeover switch When the switch is pressed, the double tension function is selected to increase the needle thread ten- sion. (The lamp above the switch is lit up.) ❻ This is not used for the LU-2810-7, 2860-7, 2818-7 and 2868-7.

・2P feed adjusting dial scale : 6 ・Standard feed adjusting dial scale : 9 ・When this switch is pressed, the stitch length is changed over from 9 to 6 and the lamp lights up. OFF ON ・When this switch pressed again, the stitch length returns from 6 to 9 and the lamp goes out. If this switch is pressed, the stitch length is changed over to that of the scale on the 2P feed adjusting dial. (Lamp in the button is lit up.)

When the switch is pressed, the needle moves from its lower-end stop position to its upper-end stop position. When raising the machine head which has been tilted, do not hold the operation switch to raise it.

Example ❹ 2P switch – 40 – Be sure to make the number of 2P feed adjusting dial less than that of the standard feed adjusting dial.

5-8. Knee switch WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❸❶ ❷❹ ❺ Black (No. 11) White (No. 4) 147 8 1White line Black line Cords of knee switch – (1) Installation of the knee switch 1) Install knee switch mounting plate ❶ on the underside of the table with wood screw ❷ sup- plied with the unit. 2) Install knee switch ❸ on knee switch mounting plate ❶ with tapping screw ❹ and washer ❺ supplied with the unit so that the cord of knee switch ❸ is brought to the downside of the switch. 3) Connect the knee switch to #4 and #11 pins of the machine connector 14P which is connected to CN36 of the machine controller. (2) Functions of the knee switch If knee switch ❸ is pressed, the amount of the al- ternating vertical movement of the walking foot and the presser foot will be maximized. (Same with the performance carried out by pressing the alternating vertical movement amount change-over switch “ ” on the machine head.) The knee lifter switch can also be used as the press- er bar lifting lever through the relevant function set- ting. (When the switch is used as the presser lifting switch, the function as the alternating vertical move- ment amount changeover switch is lost.) 41 –

・CP-18 List 1 (3) Function setting of the knee switch 1 2 TPo _ Po T _ni _ 3i 1 rEv T The lamps will be on alternately. L 2 4 3i 1 L 2 4 Po T i n nE d 1 2 TPo _ switch ❷ and return to the function setting mode. Function code Abbreviation Functional item Remarks 5 FL Presser lifter switch function Presser output will be ON while the switch is being pressed. 31 ALFL Presser lifter alternate switch function Presser output will be ON or OFF each time the switch is pressed. 24 vErT Alternate vertical movement amount conversion alternate switch function Alternate vertical movement amount output will be ON or OFF each time the switch is pressed. 25 vSW Alternate vertical movement amount conversion switch function Alternate vertical movement amount output will be ON while the switch is being pressed. 1) Enter the function setting mode referring to "6. Setting of functions of SC-922, 1)" in the Instruction Manual for the SC-922. 2) Press switch ❷ to call out function setting No.12 (option input/output function selection). 3) Press switch ❹ and select the item for “in”. 4) Press switch ❷ and select display No.i31. 5) Press switch ❹ to select the knee switch func- tion. Refer to list 1 for the details of the functions. 6) Press switch ❷ and fix the function. 7) Press switch ❷ and end the option input. 8) Select “End” item using switch ❹ . 9) Press ❹ ❸ ❷ ❶ switch ❶ or switch ❶ or switch ❸ or switch ❸ or – 42 – switch ❸ or ・CP-180 The lamps will be on alternately. 1) Enter the function setting mode referring to "18. FUNC- ❶

TION SETTING SWITCH, 1)" in the Instruction Manual for the CP-180. 2) Select function number 12 according to the function set- ting method. 3) Select the item of " " by switch ❸ . 4) Select the displayed number " " by means of switch ❷ . 5) Select the knee switch function by switch ❸ . Refer to list 1 for the details of the functions. 6) Fix the knee switch function by switch ❷ . 7) The above function is fixed by switch ❷ . 8) The option input is ended by switch ❷ . 9) Select the item of " " by switch ❸ , and return to the function setting mode. – 43 – ❸ ❷ 5-9. Function setting for the SC-922 (LU-2818-7, LU-2868-7) This section describes how to set the functions of the SC-922 specific to the LU-2818-7 and 2868-7 (Long pitch type). Refer to "6. Function setting for the SC-922" in the Instruction Manual for the SC-922. Function setting list No Item Description Setting range Indication of function setting 158 Condensation stitching function during thread trimming The function is enabled when the SC-922 is used in combina- tion with the machine head which is provided with condensa- tion stitching function for thread trimming. This item is used for setting whether or not the output of con- densation stitching function for thread trimming is produced while the thread trimmer is under control. 0 : The function is disabled 1 : The function is enabled 0/1 1 5 8 1 Details of the function setting ● Condensation stitching function during thread trimming (function setting No. 158) This function setting number is used for setting whether or not the output of condensation stitching func- tion for thread trimming is produced while the thread trimmer is under control. When this setting is set to "0" (condensation stitching function is disabled), the same thread trimming control as the LU-2810-7 is carried out. 51 8 1 0: Condensation stitching function is disabled 1: Condensation stitching function is enabled (initial value) If thread trimming failure occurs, with a heavy-weight material, since the needle enters the same entry points repeatedly when carrying out condensation stitching during thread trimming, the condensa- tion stitching function during thread trimming should be disabled, or adjust to increase the conden- sation stitch pitch. – 44 – 6. SEWING SPEED TABLE Operate the sewing machine at a speed equal to or lower than the maximum sewing speed selected from those shown in the table below according to the sewing conditions. For the LU-2810-7, 2860-7, 2818-7 and 2868-7, the sewing speed is automatically set according to the amount of the alternating vertical movement of the walking foot and the presser foot. In the case the stitch length exceeds 7 mm, change the maximum sewing speed referring to "6. Function set- ting of SC-922" in the Instruction Manual for the SC-922. Amount of alternate vertical movement of the walking foot and presser foot Stitch length : More than 9 mm and 12 mm or less (Only for the LU-2818-7 and -2868-7) 3 or less 3,000 sti/min * 2,000 sti/min 1,800 sti/min More than 3 or 4 or less 2,400 sti/min * 2,000 sti/min 1,800 sti/min More than 4 or 5 or less 2,000 sti/min 2,000 sti/min 1,800 sti/min More than 5 or 9 or less 1,800 sti/min 1,800 sti/min 1,800 sti/min * For the LU-2860, 2860-7 and 2868-7, the maximum sewing speed is 2,700 sti/min. * In the case the LU-2860, LU-2860-7 or LU-2868-7 is used with the needle gauge of 20 mm or more, the sewing speed has to be set to 2,000 sti/min or less at all times. 7. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860) The M-type belt should be used. The relation between the motor pulley and belt length and the sewing speed is as shown below. Sewing speed Effective diameter of handwheel Stitch length : 7 mm or less Stitch length : More than 7 mm and 9 mm or less Number of poles Frequency Number of revolutions of motor Effective diameter of motor pulley V-belt size 2,500 sti/min Φ 76 mm 2 50 Hz 60 Hz 2,840 rpm 3,400 rpm Φ 65 mm 42 inch Φ 55 mm 41 inch The 3-phase, 400 W, 2P clutch motor (1/2 HP) should be used. – 45 – 8. TROUBLES IN SEWING AND CORRECTIVE MEASURES Troubles Causes Corrective measures

1. Thread breakage (Thread frays or is worn out.) 1 Thread path, needle point, hook blade point or bobbin case resting groove on the throat plate has sharp edges or burrs. ○ Remove the sharp edges or burrs on the blade point of hook using a fine emery paper. Buff up the bobbin case resting groove on the throat plate. ○ Remove the sharp edges or burrs on the blade point of hook using a fine emery paper. Buff up the bobbin case resting groove on the throat plate. ○ Remove the sharp edges or burrs on the blade point of hook using a fine emery paper. Buff up the bobbin case resting groove on the throat plate. (Needle thread trails 2 to 3 cm from the wrong side of the fabric.) 6 Needle thread tension is too low. 7 Thread take-up spring works excessively or the stroke of the spring is too small. 8 Timing between the needle and the hook is excessively advanced or retarded. ○ Increase the needle thread tension. ○ Increase the needle thread tension. ○ Decrease the tension of the spring and increase the stroke of the spring. ○ Decrease the tension of the spring and increase the stroke of the spring. ○ Refer to "4-5. Needle-to-hook relation" p.27. 2 Needle thread tension is too high. 3 Bobbin case opening lever provides an excessive clearance at the bobbin case. 4 Needle comes in contact with the blade point of hook. 5 Amount of oil in the hook is too small. ○ Decrease the needle thread tension. ○ Decrease the clearance provided between the bobbin case opening lever and the bobbin. Refer to "4-7. Adjusting the bobbin case opening lever" p.29. ○ Refer to "4-5. Needle-to-hook relation" p.27. ○ Adjust the amount of oil in the hook properly. Refer to "3-1. Lubrication" p.12. 2. Stitch skipping 1 Timing between the needle and the hook is excessively advanced or retarded. 2 Pressure of the presser foot is too low. 3 The clearance provided between the top end of the needle eyelet and the blade point of hook is not correct. 4 Hook needle guard is not functional. 5 Improper type of needle is used. ○ Refer to "4-5. Needle-to-hook relation" p.27. ○ Tighten the presser spring regulator. ○ Refer to "4-5. Needle-to-hook relation" p.27. ○ Refer to "4-6. Adjusting the hook needle guard" p.28. ○ Replace the needle with one which is thicker than the current needle by one count. 3. Loose stitches 1 Bobbin thread does not pass through the tension spring of the inner hook. 2 The hook, feed dog or the thread path of thread guide, etc. has worn out or has flaws. 3 Bobbin fails to move smoothly. 4 Bobbin case opening lever provides too much clearance at the bobbin. 5 Bobbin thread tension is too low. 6 Bobbin has been wound too tightly. 7 The needle does not match the needle hole in the feed dog. ○ Thread the bobbin thread correctly. ○ Remove rough parts with a fine emery paper or buff it up. ○ Replace the bobbin or hook with a new one. ○ Refer to "4-7. Adjusting the bobbin case opening lever" p.29. ○ Increase the bobbin thread tension. ○ Decrease the tension applied to the bobbin winder. ○ Change the feed dog appropriately. (Refer to the Parts List.) 4. Thread slips off the needle eyelet simultaneously with thread trimming. 1 Thread tension given by the tension controller No. 1 is too high. ○ Decrease the thread tension given by the tension controller No. 1. ○ Decrease the thread tension given by the tension controller No. 1. ○ Decrease the thread tension given by the tension controller No. 1. ○ Decrease the thread tension given by the tension controller No. 1. – 46 –

○ 5. Thread slips off the Decrease the thread tension given by the needle eyelet at the tension controller No. 1. start of sewing. ○ Replace the clamp spring with a new one or correct the current one. ○ Increase the bobbin thread tension. 6. Thread is not cut sharply. ○ Refer to "4-8. Adjusting the position of counter knife, knife pressure and clamp pressure" p.30. ○ Replace the moving knife and counter knife with new ones, or correct the current ones. ○ Increase the bobbin thread tension. 7. Thread remains uncut after thread trimming. (Bobbin thread trimming failure when stitch length is comparatively short.) 1 The blades of moving knife and counter knife have been improperly adjusted. 2 The knives have blunt blades. 3 Bobbin thread tension is too low. ○ Refer to the Engineer’s Manual. ○ Increase the bobbin thread tension. 8. Thread breaks at the start of sewing after thread trimming. 1 Initial position of the moving knife has been improperly adjusted. 2 Bobbin thread tension is too low. 1 The needle thread is caught in the hook. ○ Shorten the length of thread remaining on the needle after thread trimming. Refer to "4-2. Thread tension" p.24. 9. When a heave-weight material is sewn, the material warps. ○ Decrease the feed dog height and reduce the feed amount of the bottom feed. (Refer to the Engineer's Manual for the adjustment procedure.) 10. Stitch skipping at the beginning of sewing (in the case of starting sewing from the material edge) 1 The feed amount of the top feed is inadequate. 1 Needle thread and bobbin thread fail to ○ Refer to "3-6. Threading the machine intertwine with each other. head" p.17. ○ Retain the needle thread on the material. Troubles Causes Corrective measures 1 Thread tension given by the tension controller No. 1 is too high. 2 The clamp spring has deformed. 3 Bobbin thread tension is too low. – 47 –


FREE ENGLISH PDF

OPERATING INSTRUCTIONS

USER GUIDE - USER MANUAL

OWNER GUIDE - OWNER MANUAL

REFERENCE GUIDE - REFERENCE MANUAL

INSTRUCTION GUIDE - INSTRUCTION MANUAL

Leave a Reply