JUKI Union Special MFC-7406 Engineer'S Manual Download Page 58

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−

MFC

Standard Adjustment

6) Confirmation of thread trimming

5) Adjustment of operating speed of thread trimmer (pneumatic type)

Backward travel of
movable knife

Forward travel of
movable knife

From

the

library

of:

Diamond

Needle

Corp

Summary of Contents for Union Special MFC-7406

Page 1: ...R ENGINEER S MANUAL 29275609 No 02 2 3 Needle Flat Bed Coverseam Machine MF 7000 Series 2 3 Needle Cylinder Bed Coverseam Machine MFC 7000 Series From the library of Diamond Needle Corp...

Page 2: ...rmation which are not covered by the Instruction Manual It is advisable to use the relevant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance of...

Page 3: ...type 43 12 Position of the presser bar 45 13 Position of the needle thread tension release without thread trimmer 45 14 Position and height of the presser foot 47 15 Position of the thread guide 47 4...

Page 4: ...t lift 8 1 mm Lubricating oil JUKI specified oil equivalent to ISO VG32 Part No 30149207 MFC 7000 Series MFC 7406 MFC 7407 MFC 7602 MFC 7605 Sewing speed 6 500 r p m Max Stitch length 1 6 to 3 2 mm No...

Page 5: ...pulley of the machine head is 49 mm MFC 7000 Series Sewing speed r p m 6500 140 35 120 35 6000 125 35 105 35 5500 110 35 90 34 5000 100 34 85 34 4500 90 34 75 34 4000 80 34 70 34 3500 70 34 60 33 Mot...

Page 6: ...lass C02 H01 U03 E12 L01 U06 Needle gauge 32 3 2 mm 40 4 0 mm 48 4 8 mm 56 5 6 mm 64 6 4 mm Devices and attachments CC1 PL5 TC2 MD1 UT12 TC3 MD2 UT13 TC4 MD6 Shape of the throat plate stitch tongue A...

Page 7: ...market U For general export T For JE JME Turkey Sub class C02 H01 K02 E11 H11 U03 E61 H21 U06 H31 Needle gauge 32 3 2 mm 40 4 0 mm 48 4 8 mm 56 5 6 mm 64 6 4 mm Devices and attachments UT1 PL1 UT2 PL4...

Page 8: ...hing With fabric under trimmer and cloth puller H01 For hemming Basic style with hem guide H11 For hemming With cloth puller H21 For hemming Left hand fabric under trimmer H31 For hemming Left hand fa...

Page 9: ...echanical type MF 7406 7407 7602 7605 E12 Under bed thread trimming device Code Description Applicable model CC1 Pneumatic type chain off thread cutter Horizontal type MF7602 MF7605 Cloth puller Code...

Page 10: ...n the blade point of the looper moves to the left in the rear of the needle and to the right in front of the needle align the upper end of the eyelet of the left needle with the lower face of the loop...

Page 11: ...Dimension B Continue turning handwheel in operating direction until bottom of looper is even with top of needle eye when looper is in front of needle If dimension A is greater than dimension B 1 Loos...

Page 12: ...distance between the blade point of the looper and the center of the right needle is 4 4 0 1 mm 4 Height of the needle bar When the looper moves to the left and the blade point of the looper comes out...

Page 13: ...tch may occur If the distance of C is small skip stitching and tangling stitch may occur If defective stitch occurs with the wooly nylon thread make the distance C as small as possible Loosen the loop...

Page 14: ...ance of the middle needle becomes larger a little Top end of looper Looper Needle 0 to 0 05 mm 6 Adjusting amount of the looper avoid When the needle descends the top point of the needle touches the b...

Page 15: ...the two screws 6 and adjust by rotating the eccentric pin 7 Amount of the avoid increases in the direction of Amount of the avoid reduces in the direction of Caution After the adjustment check again t...

Page 16: ...e longitudinal position and inclination of the rear needle guard are in the position that when the right side of the respective needles comes to the blade top of the looper the top of the needle sligh...

Page 17: ...ition of the rear needle guard 9 Caution Check that the rear needle guard does not break the loop of the needle thread by touching the groove of the needle Loosen the screw 1 and adjust the clearance...

Page 18: ...the slots of the throat plate At the maximum travel the clearance of the main feed dog and differential feed dog is equal to A A B B The height of the feed dog is 1 1 mm at the top of their stroke Th...

Page 19: ...ation of the feed dog after loosening the screw 7 and rotating the eccentric shaft inside with a slit screwdriver through the hole 8 If the position of the feed dog is high it causes the return feed s...

Page 20: ...e extreme right position the top blade of the spreader should be between left side and middle of the spreader thread guide groove The height is 0 8 to 1 2 mm from the surface of the spreader 5 Needle...

Page 21: ...rge If the movement amount of the spreaderisnotsetright itwillcause skip stitching of the top covering thread If the height of the spreader is not set right it will cause skip stitching of the top cov...

Page 22: ...er thread cam pawl wire The height of the looper thread guide plate is 1 6 mm from the lowest part of the looper cam to the upper part of the looper thread guide plate The rear side of the looper thre...

Page 23: ...the looper thread cam is too advanced the skip stitching on the back of the looper will occur If it is too retarded the tightening of the thread will be inferior If the clearance between the looper th...

Page 24: ...esser foot touches the upper face of the throat plate at the time that the needle bar is in the lowest point 12 Position of the needle thread tension release without thread trimmer When the presser fo...

Page 25: ...s small the bottom face of the presser foot can not contact tightly to the throat plate If the clearance is large the lifting amount of the presser foot will be reduced Adjust by loosening the two scr...

Page 26: ...djust the height of the presser foot so that when the needle bar is in its highest point the needle point does not come out from the lower face of the presser foot 14 Position of the thread guide 1 Mi...

Page 27: ...mes 0 5 mm on condition that the presser foot descends and rests tightly on the throat plate If the position of the presser foot is not correct it will cause defective and non straight sewing If the h...

Page 28: ...ch it 3 Spreader balance thread guide When the spreader moved to the extreme left position it should be positioned that the top covering thread does not slacken and the spreader does not pull out the...

Page 29: ...the loop is not formed the loop is too small and skip stitching occurs raise the needle thread release If the loop is excessively formed the loop is too large and the skip stitching occurs lower the...

Page 30: ...2 Thread trimmer device MF 0 05 to 0 1 mm 1 2 4 7 1 3 5 6 8 7 0 1 2 3 4 3 mm 7 5 mm 0 5 mm 5 1 2 mm Standard Adjustment 1 Adjustment of the thread trimmer device 9 From the library of Diamond Needle C...

Page 31: ...be kept flush at the time of thread trimming Loosen screw 7 and adjust upper knife 8 to the position of 7 5 mm from the right edge of feed dog At this time make sure with screw 7 that the vertical pr...

Page 32: ...29 1 2 3 4 5 6 7 8 9 7 8 9 MF Standard Adjustment 2 Thread tension release Looper thread trimmer device From the library of Diamond Needle Corp...

Page 33: ...ased and the separating plate works smoothly Thread tension release is simultaneously performed with the start of thread trimmer device Adjust the length of remaining needle thread after thread trimmi...

Page 34: ...hen the blade point of the looper moves to the left in the rear of the needle and to the right in the front of the needle and the top end of the hole of the left needle aligns with the lower part of t...

Page 35: ...s even with top of needle eye Dimension B Continue turning handwheel in operating direction until bottom of looper is even with top of needle eye when looper is in front of needle If dimension A is gr...

Page 36: ...e right needle is 4 8 0 1 mm Right needle Looper 4 8 0 1 mm 4 Height of the needle bar When the looper moves to the left and the point of the looper comes out from the left side of the left needle by...

Page 37: ...ll skipping stitch and tangling stitch will occur Loosen the screw 5 of the needle bar binder bracket inside the face cover and adjust the height of the needle bar Caution After the adjustment check t...

Page 38: ...needles 2 The height of the front needle guard is 1 75 0 1 mm from the lower part of the looper The face of the guard position is parallel to all needles having a clearance of 0 25 0 1 mm No contact...

Page 39: ...he screw 3 and move the rear needle guard back and forth Adjust the height of the front needle guard by loosening the screw 5 and move the front needle guard 4 up and down Adjust the inclination at th...

Page 40: ...back of the looper at the position of 2 3 from the upper side of the looper Adjust when the needle is replaced with an excessively different sized needle Check that the clearance between the looper an...

Page 41: ...le Position of D C If the engraved line E is turned more than 3 mm from D the looper path is left downward The damage of the blade point of the looper and needle breakage occur If the amount of avoid...

Page 42: ...d be equal to A A and B B Height of the feed dog is 1 1 mm at the top of their stroke Tilt of the feed dog is parallel to the throat plate when the needle bar is in its highest position Adjust so that...

Page 43: ...main feed dog 7 Loosen screw 2 to adjust the left right position of the differential feed dog 1 Loosen screw 9 and move the main feed dog back and forth to adjust the longitudinal position of the mai...

Page 44: ...is in the lowest position the clearance between the needle clamp spreader thread guide and the upper face of the fixing spreader thread guide is 4 0 5 mm The center of the thread guide hole aligns wit...

Page 45: ...the timing is too retarded the right needle is likely to be broken as the resistance of the covering thread becomes strong when it passes the covering thread looper If the movement amount of the spre...

Page 46: ...p preventing cam Old type 1 Height of the looper thread thread guide base The position is that the highest point of the looper thread tangling preventing cam is 0 to 0 5 mm lower than the upper part o...

Page 47: ...guide are not set right the thread may be entangled If the timing of the looper thread cam is too advanced skip stitching on the back of the looper occurs If the timing of the looper is too retarded...

Page 48: ...ar bracket and the upper end of the presser bar bushing is 0 8 mm Presser bar bushing Presser bar bracket 0 8 mm 13 Position of the needle thread tension release without thread trimmer When the presse...

Page 49: ...up and down If the clearance between the presser bar bracket and the presser bar bushing is too small the bottom face of the presser foot is not closely fitted on the throat plate If the clearance is...

Page 50: ...le top does not come out from the bottom face of the presser foot when the needle bar is in its highest point 15 Position of the thread guide 1 Middle thread guide and thread guide attaching base Spun...

Page 51: ...ning the nut 3 and rotate the screw 4 and hit it to the lever 2 so that the needle top comes 0 3 mm over from the lower part of the presser foot when the needle is in its highest point At this time lo...

Page 52: ...touch it 3 Spreader balance thread guide When the spreader moved to the extreme left position it should be positioned that the top cover thread does not slacken and the spreader does not pull out the...

Page 53: ...ing the thread guide 6 up and down If it is raised the loop of the needle thread becomes large If it is lowered the loop of the needle thread becomes small If the loop is not formed the loop is too sm...

Page 54: ...ween lower knife 7 and lever 8 is to be 0 4 mm 1 Stroke adjustment common to both elctromagnetic and pneumatic type Stroke A 17mm Gauge 4 8mm or less 18mm Gauge 5 6mm or more 4 Thread trimmer device M...

Page 55: ...nce could generate interference of knife with looper Remove hinge screw 4 remove driving lever 5 and make adjustment by turning round the connecting bar 6 Loosen the nut 1 and make adjustment by movin...

Page 56: ...knife s pointed end Position of stopper plate When looper moves forward all the way to its limit push on the thread trimmer cylinder by hand so that the distance from the pointed end of stationary kn...

Page 57: ...stationary knife 9 so that they are parallel to the side of movable knife 0 When looper moves forward all the way to its limit push on the solenoid so that the pointed end of stationary knife is situ...

Page 58: ...dard Adjustment 6 Confirmation of thread trimming 5 Adjustment of operating speed of thread trimmer pneumatic type Backward travel of movable knife Forward travel of movable knife From the library of...

Page 59: ...king adjustment of thread trimmer thread the machine and try to sew and cut off the electric power in a state that the needle bar is situated at the top dead point to disable the operation of the sewi...

Page 60: ...m At the time of bottom dead point of needle bar the presser foot should not contact the underside of spreader when lifted At the time of top dead point of needle bar the left needle point should not...

Page 61: ...oo small to turn remove the collar 0 Make adjustment by loosening the nut 3 and turning the screw 4 so that the clearance between the hinge screw 5 and the top end of screw is to be around 1 mm when t...

Page 62: ...hread 3 in 3 places Raise thread tension release hook 3 to shorten the length of the remaining thread and lower thread tension release hook 3 to lengthen the length of the remaining thread Adjust thre...

Page 63: ...tension disc 7 Remove the hinge screw 2 to confirm that thread trimmer mechanism and thread tension release mechanism work smoothly Loosen the screw 6 and move up and down the thread tension release...

Page 64: ...p covering thread when the movable knife 1 is open 0 5 mm Top covering thread Movable knife open Movable knife close 3 4 6 5 1 8 7 9 Old type Adjusting cover thread trimme The following adjustments ar...

Page 65: ...moving knife 0 picks up the thread from the underside where the thread goes from spreader 2 to the stitch side Loosen screws 3 and 4 and adjust so that the bottom of moving knife 0 should be 1 5 to 2...

Page 66: ...63 4 5 6 7 8 1 2 3 9 0 1 Existing state Changed parts 5 ASSEMBLING AND ADJUSTMENT OF FIXED CAM THREAD TAKE UP 1 Parts used Standard Adjustment From the library of Diamond Needle Corp...

Page 67: ...r cam plate 4 needle bar guard 5 and needle bar fork thread take up 6 Temporarily tighten needle bar cam plate 4 and needle bar guard 5 with screw 8 for easy assembling Part No US00050358Z US00050317E...

Page 68: ...53 mm C B A 4 0 1 2 Needle bar cam plate and needle bar fork thread take up 3 Needle thread guide and medium thread path base Standard Adjustment Standard Adjustment From the library of Diamond Needl...

Page 69: ...edle bar fork thread take up Adjust it to the rear side Horizontal direction 53 mm from the right hand side of needle bar cam plate 4 Height direction From the top end of needle thread eyelet installi...

Page 70: ...read guide 2 3 4 4 4 Spreader thread guide Normally use the hole on lower side Standard Adjustment To align height of holes At the time of needle bar upper dead point Use the thread hole located in ex...

Page 71: ...gure at the time of the lowest point of the needle bar The hole on the left hand side of the spreader thread guide When general thread is used Use the hole located on the lower side When stretchy thre...

Page 72: ...ead top covering thread Threading Thread path Needle guard Needle Needle heat Thread Thread tension Interference Chain off thread defect Thread guide Looper thread cam adjustment Thread tension To the...

Page 73: ...guard due to incorrect position Too thin needle for fabric used Needle thread tension is too strong Feed dog is too high or needle height is too low resulting in needle breakage due to needle swerve I...

Page 74: ...ght to appropriate height Refer to standard adjustment Refer to threading diagram Use needle guard Reduce the tension Same described in page Thread breakage by needle heat Refer to standard adjustment...

Page 75: ...o standard adjustment Refer to standard adjustment Replace it with the genuine part Replace the needle with new one Correct the mounting direction Use UY121GJS CS100 UY128 GBS FS300 Do not use nipper...

Page 76: ...eading diagram Refer to standard adjustment Increase tension Refer to standard adjustment Looper Needle Needle height Threading Looper adjustment Looper thread tension Looper thread cam timing Trouble...

Page 77: ...ustment Increase tension Refer to standard adjustment Spreader Needle Spreader adjustment Stationary spreader thread guide Needle height Threading N e e d l e c l a m p s p r e a d e r thread guide Sp...

Page 78: ...to standard adjustment Refer to standard adjustment Needle Spreader adjustment Needle height Threading Spreader thread tension Spreader pull off Stationary spreader thread guide Troubles 1 Troubles 2...

Page 79: ...stment Refer to standard adjustment Refer to standard adjustment Refer to threading diagram Increase tension Refer to standard adjustment Spreader Needle Spreader adjustment Stationary spreader thread...

Page 80: ...r thread is too much Replace the needle with the new one Use UY121GJS CS100 UY128GBS FS300 Refer to standard adjustment Refer to threading diagram Increase R Polish correctly Replace it with the genui...

Page 81: ...78 One chain stitch by right needle One chain stitch by middle needle One chain stitch by left needle Right needle thread miss Middle needle thread miss From the library of Diamond Needle Corp...

Page 82: ...JS CS100 UY128GBS FS300 Replace the looper when modified or its shape is changed too much Refer to standard adjustment Refer to threading diagram Increase tension Lift the thread Do not use nipper Thr...

Page 83: ...rd adjustment Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Correct or replace part Replace needle with new one Use UY121GJS CS100 UY128GBS FS300 Repl...

Page 84: ...shape is changed too much Refer to standard adjustment Increase tension Refer to threading diagram Increase tension Reduce drawing in amount of thread Replace when modified or its shape is changed too...

Page 85: ...o standard adjustment Refer to standard adjustment Increase tension Refer to threading diagram Increase tension Replace when its shape is modified or changed too much Replace needle with new one Use U...

Page 86: ...ce edge Refer to standard adjustment Refer to standard adjustment Refer to standard adjustment Refer to standard adjustment Lift the position Sharpen or replace edge Refer to standard adjustment Make...

Page 87: ...1 151 346 1 346 1 183 18 24 30 60 93 5 810 360 15 Drawer installing position 390 100 Drawer stopper installing position back side Push button switch mounting position Stand installing position 120 13...

Page 88: ...terbore 3 2 4 0 40 125 1 173 1 208 1 58 32 337 5 225 379 1 82 5 Y Z 54 2 5 R R23 5 R 2 3 5 R 2 3 5 R 2 3 5 R 2 5 2 R 2 5 2 R25 523 533 234 5 90 5 305 1 22 24 738 346 1 346 1 264 1 159 1 66 5 1 R 2 E n...

Page 89: ...80 130 810 600 R 2 5 R 2 5 R 2 3 5 2 2 7 R 2 3 5 264 1 40 136 5 173 1 295 Drawer stopper installing position back side 100 390 570 10 15 JUKI logotype R 6 40 21 50 R2 R 2 Detailed measurement 2 1 11 1...

Page 90: ...66 5 1 40 32 42 191 Stand installing position Push button switch mounting position R 6 30 125 280 264 1 489 60 130 810 40 2 2 7 3 R10 R 2 0 R10 R10 R20 97 5 173 1 136 5 295 40 100 570 390 10 15 JUKI...

Page 91: ...1 40 500 1200 70 1 340 30 600 500 R30 R 3 0 R 6 R 3 0 R 6 17 R30 R 164 1 6 0 159 1 75 100 15 390 60 570 120 40 3 8 5 26 Counterbore 1 deep with slot Stand installing position JUKI logotype Drawer stop...

Page 92: ...R 30 R 3 0 R 6 R30 R 3 0 R 6 R 159 1 75 100 15 390 60 570 120 40 Z Z JUKI logotype Push botton switch mounting position Stand installing position Drawer stopper installing position back side 40 R 2 R...

Page 93: ...8 5 26 19 deep 78 5 123 5 60 80 60 471 214 136 30 185 1 143 1 20 1 258 23 32 1 46 R 4 116 262 1 242 1 413 1 32 15 4 10 25 64 143 20 143 164 1 35 125 80 70 1 40 120 1 40 R2 Entire round R 2 E n t i r e...

Page 94: ...32 214 3 8 5 26 Counterbore 1 deep with slot Z Z 66 5 1 98 53 2 0 70 1 262 1 242 1 45 R8 R8 R 8 5 26 19 deep R30 R 6 164 1 118 80 154 339 380 450 R 8 R 3 0 R 6 15 JUKI logotype 40 50 21 R 3 0 R 6 10...

Page 95: ...l is subject to change for improvement of the commodity without notice 00 12 Printed in Japan E R INTERNATIONAL SALES H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3430 4001 to 4005...

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