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JUKI LH-3500A series Instruction Manual

Lh-3500a series
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ENGLISH
LH-3500A Series
INSTRUCTION MANUAL

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Summary of Contents for JUKI LH-3500A series

  • Page 1 ENGLISH LH-3500A Series INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ......................1 2. NAME OF EACH COMPONENT ................... 3 3. INSTALLATION ......................4 3-1. Caution at the time of set-up ..........................4 3-2. Installation of the sewing machine ........................5 3-3. Adjusting the height of the knee lifter ......................6 3-4.

  • Page 3: Specifications

    3.2 to 3.8 mm Lft of presser foot 3 mm by knee lfter, 7 mm by hand lfter lever Lubrcaton JUKI NEW �EFRIX OIL No.  or JUKI MACHINE OIL �7 �eclaraton �eclaraton - Equvalent contnuous emsson sound - Equvalent contnuous emsson sound...
  • Page 4 4.8 to 9.5 mm Lft of presser foot 3 mm by knee lfter, 7 mm by hand lfter lever Lubrcaton JUKI NEW �EFRIX OIL No.  or JUKI MACHINE OIL �7 �eclaraton �eclaraton - Equvalent contnuous emsson sound - Equvalent contnuous emsson sound...

  • Page 5: Name Of Each Component

    2. NAME OF EACH COMPONENT 1 Separately drven needle changeover lever 8 Power swtch (LH-356�8A, 356�8A-7, 3588A, 3588A-7) 9 Reverse feed swtch 2 Thread take-up cover (LH-3528A-7, 356�8A-7, 3528A (F type), 3578A-7, 3 Fnger guard 3588A-7) 4 Thread tenson controller !0 Operaton panel 5 Control box !1 Bobbn wnder...

  • Page 6: Installation

    3. INSTALLATION 3-1. Caution at the time of set-up (1) Transporting procedure of the sewing machine [LH-3528A, 3568A, 3578A, 3588A] [LH-3528A-7, 3568A-7, 3578A-7, 3588A-7] Hold and transport the sewing machine with two persons as shown in the illustration. When carrying the sewing machine, take extreme care not to hold the thread tension controllers by hand.

  • Page 7: Installation Of The Sewing Machine

    3-2. Installation of the sewing machine (1) Installing the under cover 22.5mm 18.5mm ) The under cover should rest on the four corners 2) Fx two rubber seats 1 on sde A (operator’s sde) usng nals 2 as llustrated above. Fx two of the machne table groove.

  • Page 8: Adjusting The Height Of The Knee Lifter

    3-3. Adjusting the height of the knee lifter 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. ) The standard heght of the presser foot lfted usng the knee lfter s 2 mm.

  • Page 9: Preparation Of The Sewing Machine

    4. PREPARATION OF THE SEWING MACHINE 4-1. Method of lubrication For ths sewng machne, one of two dfferent lubrcatng methods can be selected. (1) Method of circulating lubrication (when the oil collected in the under cover is reused) Oil tank Lubrication to hook side Ball float case...

  • Page 10: Lubrication To The Oil Tank

    2,000 sti/min or less. • For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MD- FRX1600C0) or JUKI MACHINE OIL #7 (Part No. : MML007600CA).

  • Page 11: Draining Of Oil From The Oil Tank

    4-3. Draining of oil from the oil tank WARNING : 1. To prevent accidents caused by abrupt start of the sewing machine, do not connect the power plug until draining of oil has been completed. 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.

  • Page 12: Oil In The Feed Box

    To use in safety, replace the oil wick of hook section with a new one approximately once a year with the procedure below. ) Loosen setscrews 2 (small hook : 2 places, large hook : 3 places) and remove hook gb 1 . 2) Remove nner hook 3 .

  • Page 13: Applying Grease

    When using SC-920, when the time of grease-up comes, the warning alarm sounds. When the alarm sounds, perform grease-up. • Never lubricate oil to the grease applying places. • When grease is applied more than is necessary, there is a fear that grease leaks from the thread take-up lever cover section or the needle bar. So, be careful. • Be sure to use the grease contained in JUKI GREASE A TUBE (Part No. : 40006323) supplied with the machine head as accessories. (1) Sections to be applied with grease [LH-3528A, 3528A-7, 3578A, 3578A-7] Thread take-up...
  • Page 14 [LH-3568A, 3568A-7, 3588A, 3588A-7] Thread take-up lever (oil wick) Felt Needle bar Square block Needle bar bracket Face plate lubrication felt [Common] Remove the rubber cap, take out the felt n A , pour new grease n the hole, and put the felt to whch grease has been soaked after removng old grease adhered to the nsde of the hole and the felt.
  • Page 15 (2) Releasing procedure of the grease-up warning for SC-920 When the tme of grease-up has come, screen dsplay of LE� 5 on the left-hand figure becomes "E220". After performng grease-up, release the warnng followng the procedure below. WARNING : To avoid possible personal injuries caused by movement other than that you desired, do not operate the switches in the procedure other than those required, as described below, to specify the functions.

  • Page 16: Setting Up The Sc-920

    5) When settng No. 6 s adjusted to "8", the current set value s dsplayed on LE� 5 . Then Press swtch 4 (swtch 3 ) to change to "". 6�) When the change has been com- pleted, press swtch 2 or 1 to specfy the changed value.
  • Page 17 2) Fx rubber cushon 6 on control-box mountng plate 3 wth nut 4 and sprng washer 7 . Three sets of 2 are requred. 3) Fx control-box mountng plates 2 assembled n step 2) on the table wth decoraton bolts 1 , washers 8 , sprng washers 9 and nuts !0 .
  • Page 18 (3) Setting procedure of the machine head For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used for the setting procedure of the machine head. ) Call functon settng No. 95 refer- rng to "#-6.
  • Page 19 (4) Adjusting the machine head (LH-3528A-7, 3568A-7, 3578A-7 and 3588A-7) When the slip between the white marker dot on the handwheel and the concave of the cover is excessive after thread trimming, adjust the angle of the machine head by the operation below. ) Smultaneously pressng swtch 2 and swtch 3 , turn...

  • Page 20: Installing The Belt Cover (For Lh-3528A, 3568A, 3578A And 3588A)

    4-8. Installing the belt cover (For LH-3528A, 3568A, 3578A and 3588A) 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. LH-3528A, 3568A LH-3578A, 3588A (mm)

  • Page 21: How To Take Out The Bobbin Case

    4-10. How to take out the bobbin case 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. ) Lft latch 1 and take out the bobbn case and the bobbn together.

  • Page 22: Threading The Machine Head

    4-12. Threading the machine head [S type and G type] LH-3528A, 3528A-7, 3568A and 3568A-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. Fig.
  • Page 23 [G type] LH-3578A, 3578A-7, 3588A and 3588A-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. Fig.
  • Page 24 [A type and F type] 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. Fig.

  • Page 25: Thread Tension

    4-13. 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. [S type and G type] [A type and F type] ) Needle thread tenson Turn thread tenson nut No.

  • Page 26: Winding The Bobbin Thread

    4-14. Winding the bobbin thread ) Insert the bobbn deep nto the bobbn wnder spndle 1 untl t wll go no further. 2) Pass the bobbn thread pulled out from the spool rested on the rght sde of the thread stand follow- ing the order as shown in the figure on the left.

  • Page 27: Thread Take-Up Spring

    4-15. Thread take-up spring 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. [S type and G type] (1) When you want to change the stroke of the thread take-up spring ) For thread take-up sprng 3 on the left sde, loosen screw 2 and adjust the stroke of the sprng by mov- ng the screw along the slot for adjustment.
  • Page 28 [A type and F type] (1) When you want to change the stroke of the thread take-up spring To turn ) Stroke of thread take-up sprng 1 on the rght s adjustable by movng thread tenson No. 2 asm. 3 to the left or rght after loosenng thread tenson No.

  • Page 29: Adjusting The Stitch Length

    4-16. Adjusting the stitch length Turn sttch dal 1 counterclockwse (clockwse) to set the value on the dal correspondng to a desred sttch length to the marker dot 3 engraved on the machne arm. When t s hard to turn sttch dal 1 , turn t whle slghtly depressng reverse feed control lever 2 .
  • Page 30 [LH-3568A, 3568A-7, 3588A and 3588A-7] • Adjust the needle and the hook as follows. [Adjusting procedure for DPx5(134) needle] ) Set the sttch dal at 2.5 for the S type or 3 for the G type. 2) Turn the handwheel to algn the blade pont of hook wth the center of needle when the needle bar goes up by 2.2 mm from the lowest poston (lower engraved...

  • Page 31: Pedal Pressure And Pedal Stroke

    4-18. Pedal pressure and pedal stroke 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) Adjusting the pressure required to Upper depress the front part of the pedal...

  • Page 32: Operation Of The Sewing Machine

    5. OPERATION OF THE SEWING MACHINE 5-1. Pedal Operation [The pedal is operated in the following four steps: ] ) The machne runs at low sewng speed when you lghtly depress the front part of the pedal. B 2) The machne runs at hgh sewng speed when you further depress the front part of the pedal.

  • Page 33: Adjusting The Pressure Of The Presser Foot

    5-3. Adjusting the pressure of the presser foot Loosen nut 2 by turnng counterclockwse, and turn presser sprng regulator 1 to adjust the pressure. Decrease Increase Turn the regulator clockwse to ncrease the pres- sure and turn t counterclockwse to decrease the pressure.

  • Page 34: Thread Tension Release Changeover When Using The Knee Lifter

    5-5. Thread tension release changeover when using the knee lifter For the LH-356�8A, 356�8A-7, 3588A and 3588A-7, the thread tenson release of the thread tenson controller has been factory-nterlocked wth the knee lfter or AK devce at the tme of delvery. •...

  • Page 35: Maintenance

    6. MAINTENANCE 6-1. Procedure of changing over between bottom feed and needle feed and the adjustment (for LH-3528A only) 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) Changing procedure to bottom feed and the adjustment ) Set the sttch dal at the mnmum value.
  • Page 36 (2) Changing procedure to needle feed and the adjustment The procedure s the reverse of "() Changng procedure to bottom feed and the adjustment". Loosen hnge screw 1 , move needle bar rockng rod 2 from needle rocking rod fixing base 3 to needle bar rockng rod arm 4 , and fix it with hinge screw 1 .

  • Page 37: Changing The Feed Timing

    6-2. Changing the feed timing The feed tmng has been factory-adjusted as llus- trated n the sketch on the left. The followng descrbes how to change the feed tm- ng to produce better-tensed seams from the state gven n the sketch on the rght. ) Turnng pulley 1 , remove tmng belt 2 from the pul- ley.

  • Page 38: Adjusting The Thread Trimming Cam

    6-3. Adjusting the thread trimming cam (1) Position of the thread trimming cam and the thread trimming timing ) Algn engraved marker dot 1 on the arm wth engraved marker dot 2 (red) on the handwheel. 2) When thread trmmer drvng arm stopper 3 comes n contact wth knfe drvng arm 4 , press cam roller 5 nto the groove n thread trmmng cam 6 .

  • Page 39: Adjusting The Hook Needle Guard

    6-4. 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. (Bend inward.) (Bend outward.) 0 to 0.05mm...

  • Page 40: Adjusting The Height And The Inclination Of The Feed Dog

    6-6. Adjusting the height and the inclination of the feed dog 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) Adjusting the height ) Loosen feed drvng lnk setscrew 1 .

  • Page 41: Replacing The Gauge

    6-7. Replacing the gauge 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. Drive arm pin Drive arm pin •...

  • Page 42: Adjusting The Position Of The Moving Knife

    6-9. Adjusting the position of the moving knife 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. ) Algn counter knfe base 1 wth plane A of counter knfe 2 .

  • Page 43: Position Of The Wiper

    6-10. Position of the wiper 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. Needle ) Adjust engraved marker dot 1 on the machne arm to whte marker dot 2 on the handwheel.

  • Page 44: Replacing The Bobbin Thread Slack Preventer Spring (For Lh-3568A, 3568A-7, 3588A And 3588A-7)

    6-12. Replacing the bobbin thread slack preventer spring (For LH-3568A, 3568A-7, 3588A and 3588A-7) ) Loosen screw 1 and remove bobbn thread slack preventer sprng 2 from the groove on the bobbn case. 2) Ft bobbn thread slack preventer sprng 2 whch replaces the removed sprng n the bobbn case through the groove.

  • Page 45: Stitch-To-Angle Table By Gauge (Pitch And Mm Conversion Table)

    7. STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE) /8"(3.7mm) 5/32"(3.96�mm) Number of Number of 6� sttches sttches 6� Turnng Turnng angle angle 3.6� .6� 6�0 6�0 .6� .6� 2.6� 3/6�"(4.76�mm) 7/32"(5.56�mm) Number of Number of sttches 6� sttches 6�...

  • Page 46: Gauge Sets

    8. GAUGE SETS (1) LH-3528A Swvel gude Needle gauze sze Presser foot asm. Presser foot asm. Tp-dvded Tp-dvded Lower feed Code nch P a r t N o . P a r t N o . P a r t N o .
  • Page 47 Needle gauze sze Feed dog 1 . 7 1 . 7 1 . 7 1 . 7 1 . 7 1 . 1 5 Code 1 . 2 1 . 9 1 . 7 2 . 2 1 . 4 1 .
  • Page 48 (2) LH-3528A-7 Needle gauze sze Throat Plate Needle clamp asm. Feed dog 1 . 7 1 . 7 1 . 7 1 . 7 Code 2 . 2 m m 1 . 7 Wre type Hole type 1 . 9 Opton Opton 2 .
  • Page 49 (3) LH-3568A Sldng plate asm. Sldng plate asm. Needle gauze sze Needle clamp asm. (�P5) (Left) (Front) Needle clamp asm. Needle clamp asm. Needle clamp asm. Needle clamp asm. (Left) (Rght) (Left) (Rght) Code Opton Opton Opton Hole type Hole type nch P a r t N o .
  • Page 50 (4) LH-3568A-7 Swvel gude Needle gauze sze Feed dog Presser foot asm. Throat Plate Presser foot asm. Opton Opton Tp-dvded Tp-dvded 1 . 7 1 . 7 1 . 7 1 . 7 Code 1 . 9 2 . 2 m m 2 .
  • Page 51 (5) LH-3578A (G type) Needle clamp Presser foot Swvel gude Throat Plate Needle gauze sze Feed dog Throat Plate asm. asm. Presser foot asm. (wth tapng) 1 . 7 Tp-dvded 1 . 7 Code 2 . 2 m m 2 . 2 Hole type Opton nch...
  • Page 52 (6) LH-3578A-7 (G type) Needle clamp Needle gauze sze Throat Plate Feed dog asm. 1 . 7 1 . 7 Code 2 . 2 m m Hole type Opton 2 . 4 nch P a r t N o . P a r t N o .
  • Page 53 (7) LH-3588A (G type) Needle gauze sze Needle clamp asm. (�P7) Needle clamp asm. (�P5) Needle clamp Needle clamp Needle clamp Needle clamp asm. (Left) asm. (Rght) asm. (Left) asm. (Rght) Code Opton Opton Hole type Hole type nch P a r t N o .
  • Page 54 (8) LH-3588A-7 (G type) Swvel gude Needle gauze sze Feed dog Throat Plate Presser foot asm. Presser foot asm. Opton Tp-dvded 1 . 7 1 . 7 Code 2 . 2 m m 2 . 4 nch P a r t N o .

  • Page 55: Troubles And Corrective Measures

    9. TROUBLES AND CORRECTIVE MEASURES TROUBLES CAUSES CORRECTIVE MEASURES Thread breakage 1 There s a sharp edge or burr on ™ Remove sharp edge or burr using a fine (Thread s untwsted the thread path, needle pont, hook sandpaper. Polsh the surface of the or scraped.) blade pont or bobbn case restng bobbn case restng groove on the throat...
  • Page 56 TROUBLES CAUSES CORRECTIVE MEASURES Loose sttch 1 Bobbn thread does not pass ™ Thread the bobbn case correctly. through the forked end of the tenson sprng on the bobbn case. 2 Thread path has rough surface. ™ Remove rough surface using a fine sandpaper or polsh the surface usng a buffing wheel.

  • Page 57: Motor Pulley And Belt

    10. MOTOR PULLEY AND BELT ■ Motor pulley and belt for the machine without thread trimmer are as described below. 1) Use a clutch motor with an output 400 W (2P). 2) Use M type V belt. 3) The relation between the motor pulley, belt length and number of revolutions of sewing machine is as shown in the list below.

This manual is also suitable for:

Lh-3528aLh-3528a-7Lh-3578aLh-3578a-7

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