Related Manuals for JUKI MF-7000 Series
Summary of Contents for JUKI MF-7000 Series
- Page 1 2-3 Needle Flat Bed Coverseam Machine MF-7000 Series 2-3 Needle Cylinder Bed Coverseam Machine MFC-7000 Series ENGINEER’S MANUAL 29275609 No.02...
- Page 2 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. This manual describes “Standard Adjustment” , “Adjustment Procedures” , “Results of Improper Adjutment”, and other important information 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 these machines.
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Page 3: Table Of Contents
CONTENTS 1. SPECIFICATIONS ........................1 2. MOTOR AND BELT ........................2 3. MODEL NUMBERING SYSTEM ....................3 4. STANDARD ADJUSTMENT ....................... 7 (1) MF .................................... 7 1) Timing relation between the needle and the feed ....................7 2) Adjusting the timing relation between the needle bar and looper (synchronization) : Without gauges ......7 3) Returning amount of the looper ......................... -
Page 4: Specifications
Stretching stitch 1 : 0.6 Needle UY128GAS #65 / 025 to #90 / 036 Presser foot 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. -
Page 5: Motor And Belt
2. MOTOR AND BELT MF-7000 Series 50 Hz 60Hz Sewing speed Motor pulley V belt (inch) Motor pulley V belt (inch) (r.p.m.) Outer dia. (mm) Fully-submerged Semi-submerged Fully-submerged Semi-submerged Outer dia. (mm) type type type type 6500 6000 5500 5000... -
Page 6: Model Numbering System
− −... - Page 7 − −...
- Page 8 Covering With adjustable seam guide for medium- to heavy-weight fabrics Universal Differential feed dog 3-row Universal Differential feed dog 4-row Elastic tape cutter (MF-7000 Series) Code Description Applicable model Pneumatic type tape cutter Single action air cylinder knee switch E12, C02...
- Page 9 Under-bed thread trimming device Solenoid type Pneumatic type Top covering Needle Needle Top covering Code Applicable model Thread Needle Thread thread thread wiper thread wiper thread Auto-lifter Auto-lifter trimmer thread wiper trimmer trimmer (Mechanical) (Pneumatic) trimmer ○ ○ ○ MFC7406,7407 ○...
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Page 10: Standard Adjustment
4. STANDARD ADJUSTMENT (1) MF Standard Adjustment 1) Timing relation between the needle and the feed First screw A in operating direction on double eccentric 1 of feed drive assembly must be straight up, when the needle bar is at bottom of stroke. 2) Adjusting the timing relation between the needle bar and looper (synchronization) : Without gauges Move to the left... - Page 11 Adjustment Procedures Results of Improper Adjustment ™ Remove top cover, feed cover, gasket and cloth plate. ™ Needle breakage ™ Loosen screws B of sprocket 2. ™ Looper fails to catch needle thread. ™ Rotate lower main shaft in operating direction counterclockwise, until the first screw A on double eccentric 1 is straight up.
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Page 12: Returning Amount Of The Looper
Standard Adjustment 3) Returning amount of the looper When the looper is in the extreme right position,the distance between the blade point of the looper and the center of the right needle is 4.4 ± 0.1 mm. Right needle Looper 4.4 ±... - Page 13 Adjustment Procedures Results of Improper Adjustment ™ Loosen the looper base setscrew 4 and adjust the returning ™ If the returning amount is large, amount of the looper. skipping stitch and tangling stitch (Use a 5/32 inch hexagonal wrench.) may occur and the range of the thickness of the cloth to be sewn is reduced.
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Page 14: Clearance Between The Looper And Needle
Standard Adjustment 5) Clearance between the looper and needle Clearance between the blade point of the looper and the grooves of the right/left needles is 0 to 0.05 mm. (Clearance of the middle needle becomes larger a little.) Right needle Looper 0 to 0.05 mm 0 to 0.05 mm... - Page 15 Adjustment Procedures Results of Improper Adjustment ™ Loosen the looper base setscrew 4 and adjust by moving the ™ If the clearance is too large, the looper base back and forth. loop of the needle thread is not scooped and the back of the looper hits strongly the top point of the needle which causes the damage of the needle point.
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Page 16: Position Of The Needle Guard
Standard Adjustment 7) Position of the needle guard 1 Rear needle guard ™ The height of the rear needle guard is in the position that the rear needle guard is 0.8 mm above the top of the needle when the looper moves to the left as shown in the figure. ™... - Page 17 Adjustment Procedures Results of Improper Adjustment ™ Loosen the screw 8 and adjust the height and inclination of the rear needle guard 9. Loosen the screw !0 and adjust the longitudinal position 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.
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Page 18: Position Of The Feed Dog
Standard Adjustment 8) Position of the feed dog ™ The clearance of the left/right sides of the feed dog should be equal in 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’. - Page 19 Adjustment Procedures Results of Improper Adjustment Open the cover located at the rear side of the needle entry. ™ If the left/right positions of the ™ Adjust the longitudinal position of the main feed dog after feed dog are incorrect, the left/ loosening the nut !3 and rotating the eccentric nut !4 .
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Page 20: Spreader
Standard Adjustment 9) Spreader 1 Timing 2 Stroke Descend Highest point 2.5 ± 0.1 mm Direction of cloth feeding Return 19 ± 0.1 mm Just when the needle descends 2.5 mm from the highest point of the needle bar, the spreader begins to return from its extreme left position. - Page 21 Adjustment Procedures Results of Improper Adjustment ™ Adjust the timing by loosening screw # 0 of the spreader ™ If the timing is too advanced, the eccentric cam @9 and rotate the spreader eccentric cam @9 . needle does not catch the covering ™...
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Page 22: Looper Thread Cam
Standard Adjustment 10) Looper thread cam 1 Timing ™ When the looper thread is pulled from the highest point of the looper thread cam, the top point of the left needle aligns with the lower face of the looper. Looper thread Needle descends... - Page 23 Adjustment Procedures Results of Improper Adjustment ™ Adjust the timing of the looper thread cam by loosening the ™ If the timing of the looper thread two screws #9 . cam is too advanced, the skip ™ Adjust the height of the looper thread guide plate by loosening stitching on the back of the the screw $0 and move the looper thread guide plate $1 up and looper will occur.
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Page 24: Position Of The Presser Bar
Standard Adjustment 11) Position of the presser bar The clearance between the presser bar bracket and the presser bar bushing is 0.8 mm when the feed dog is under the throat plate and the bottom face of the presser foot touches the upper face of the throat plate at the time that the needle bar is in the lowest point. - Page 25 Adjustment Procedures Results of Improper Adjustment ™ Adjust by loosening the two screws %4 and move the presser ™ If the clearance between the bar bracket %5 up and down. presser bar bracket and the presser bar bushing is small, the bottom face of the presser foot can not contact tightly to the throat plate.
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Page 26: Position And Height Of The Presser Foot
Standard Adjustment 13) Position and height of the presser foot 1 Adjust the position of the presser foot so that the needles enter the center of the needle entry holes in the presser foot on condition that the presser foot is set correct to the presser bar. 2 Adjust 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. - Page 27 Adjustment Procedures Results of Improper Adjustment ™ Adjust the position by loosening the screw % 8 and move the ™ If the position of the presser foot presser foot %9 to the left and right. is not correct, it will cause ™...
- Page 28 Standard Adjustment 2 Needle bar needle thread release ™ When the loop of the needle thread is not easily formed, raise the needle thread release as shown in the figure at the time of the lowest point of the needle bar. Lowest point of needle bar Needle bar eyelet Needle thread release...
- Page 29 Adjustment Procedures Results of Improper Adjustment ™ Loosen screw ^1 and adjust by moving the needle thread release ™ If it is raised, the loop of the ^2 up and down. needle thread becomes large. ™ Loosen screw ^3 and adjust by moving the right needle thread ™...
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Page 30: Thread Trimmer Device (Mf)
(2) Thread trimmer device (MF) Standard Adjustment 1) Adjustment of the thread trimmer device 3 mm 7.5 mm 1.2 mm 0.5 mm 0.05 to 0.1 mm − −... - Page 31 Adjustment Procedures Results of Improper Adjustment ™ Loosen screws 3 to such an extent that bracket 1 in terms of support 2 moves. ™ Align engraved marker dot on the frame with that on the hand pulley when needle is at its upper dead point, and perform all adjustments.
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Page 32: Thread Tension Release (Looper Thread Trimmer Device)
Standard Adjustment 2) Thread tension release (Looper thread trimmer device) − −... - Page 33 Adjustment Procedures Results of Improper Adjustment ™ Set tongue 2 of thread tension disk separating plate to such a near position where the tongue hardly comes in contact with thread tension disks 1. Thread tension disk 1 starts floating immediately after the start of thread trimming.
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Page 34: Mfc
(3) MFC Standard Adjustment 1) Timing relation between the needle and the feed First screw A in operating direction on double eccentric 1 of feed assembly must be straight up, when the needle bar is at top of stroke. 2) Adjusting the timing of the needle bar and looper (Synchronization) : Without gauges Move to the left Move to the right Looper... - Page 35 Adjustment Procedures Results of Improper Adjustment ™ Remove top cover, feed cover, gasket and cloth plate. ™ Needle breakage ™ Loosen screws B of sprocket 2. ™ Looper fails to catch needle ™ Rotate lower main shaft in operating direction clockwise, until thread.
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Page 36: Returning Amount Of The Looper
Standard Adjustment 3) Returning amount of the looper When the looper is at the extreme right position, the distance between the blade point of the looper and the center of the 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... - Page 37 Adjustment Procedures Results of Improper Adjustment ™ Adjust the returning amount by loosening the looper holder If the returning amount is large, binder screw 4. skipping stitch and tangling stitch will occur. And the thickness of the material to be sewn will be reduced. If the returning amount is small, skipping stitch and tangling stitch will occur.
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Page 38: Position Of The Needle Guard
Standard Adjustment 5) Position of the needle guard 1 The height of the rear needle guard is adjusted so that the point of the right needle comes to the 1/ 2 height of the contact surface of the rear needle guard when the blade point of the looper aligns with the right side of the right needle. - Page 39 Adjustment Procedures Results of Improper Adjustment ™ Adjust the height of the rear needle guard by loosening the ™ If the clearance between the rear screw !2 and move the rear needle guard !1 up and down. needle guard and the needle is Adjust the pushing amount by loosening the screw ! 3 and move large, it causes the skipping the rear needle guard back and forth.
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Page 40: Adjusting Amount Of The Looper-Avoid
Standard Adjustment 7) Adjusting amount of the looper-avoid ™ When there is only one adjustment line in the sewing machine, adjust so that the looper path shifting cam is placed 8 mm from the adjustment eccentric line. (Measurement of 8 mm should be performed on the top surface of the looper path shifting cam.) New type Adjustment line 8 mm... - Page 41 Adjustment Procedures Results of Improper Adjustment 1 Adjustment of looper path Old type Left needle Right needle Engrared line D Engrared 3 mm (Standard) line C Looper path Engrared Position of D-C shifting cam line E Setscrew ™ If the engraved line E is turned Setscrew more than 3 mm from D, the looper path is left downward.
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Page 42: Position Of The Feed Dog
Standard Adjustment 8) Position of the feed dog ™ The clearance between the slot on the throat plate and the left/right sides of the feed dog should be equal. ™ In the maximum stroke end of the main feed dog and differential feed dog, the clearance should be equal to A = A’... - Page 43 Adjustment Procedures Results of Improper Adjustment ™ If the lateral position of the feed dog is not correct, the left/right sides of the feed dog and the throat plate will wear out. Heating and abnormal noise will be produced. Also, the feed components will wear out quickly and looseness and bending of the components will occur.
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Page 44: Spreader
Standard Adjustment 9) Spreader 1 Timing 2 Stroke Descend Highest point Direction of cloth feed 2.5 ±0.1 mm Return 19 ±0.1 mm Just when the needle descends 2.5 mm from the highest point of the needle bar, the spreader begins to return from the extreme left position. 3 Position of spreader ™... - Page 45 Adjustment Procedures Results of Improper Adjustment A d j u s t t h e t i m i n g b y ™ If the timing is too advanced, loosening the screw #0 of the skipping stitch is likely to occur spreader eccentric cam @9 as when the needle decends, the and rotating the spreader...
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Page 46: Looper Thread Cam
Standard Adjustment 10) Looper thread cam 1 Timing of the looper thread cam When the needle bar descends and the tip of the left needle aligns with the lower part of the looper, the looper thread can be cast off from the highest point of the looper cam. - Page 47 Adjustment Procedures Results of Improper Adjustment ™ Timing of the looper thread ™ If the timing of the looper thread Looper thread c a m i s a d j u s t e d b y cam is too advanced, skip loosening the screw $6 and stitching on the back of the 4.0 mm...
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Page 48: Position Of The Presser Bar
Standard Adjustment 12) Position of the presser bar When the feed dog is under the lower part of the throat plate and the bottom face of the presser foot contacts the upper face of the throat plate at the lowest point of the needle bar, the clearance between the presser bar bracket and the upper end of the presser bar bushing is 0.8 mm. - Page 49 Adjustment Procedures Results of Improper Adjustment ™ Loosen the two screws %4 and adjust the position by moving ™ If the clearance between the the presser bar bracket %5 up and down. 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.
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Page 50: Position And Height Of The Presser Foot
Standard Adjustment 14) Position and height of the presser foot 1 Adjust the position of the presser foot so that the needles are positioned to enter the centers of the holes of the needle entry of the presser foot on condition that the presser foot is set right to the presser bar. - Page 51 Adjustment Procedures Results of Improper Adjustment ™ Adjust the position by loosening the screw % 8 and move the ™ If the position of the presser foot presser foot %9 to the left and right. is not correct, it will cause ™...
- Page 52 Standard Adjustment 2 Needle bar needle thread release ™ When the loop of the needle thread is not easily formed, Lowest point of needle bar raise the needle thread release as shown in the left figure Needle bar at the time of the lowest point of the needle bar. balance Needle thread release...
- Page 53 Adjustment Procedures Results of Improper Adjustment ™ Loosen screw ^1 and adjust by moving the needle thread ™ If it is raised, the loop of the release ^2 up and down. needle thread becomes large. ™ Loosen screw ^3 and adjust by moving the right needle thread ™...
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Page 54: Thread Trimmer Device (Mfc)
(4) Thread trimmer device (MFC) Standard Adjustment 1) Stroke adjustment (common to both elctromagnetic and pneumatic type) Stroke A 17mm : Gauge 4.8mm or less 18mm : Gauge 5.6mm or more 2) Adjustment of the right position of movable knife (return) Space between lower knife 7 and lever 8 is to be 0.4 mm 0.4 mm − ... - Page 55 Adjustment Procedures Results of Improper Adjustment Loosen the nut 1 , and make adjustment by moving the block 2 ™ Too short stroke disables thread along the shaft 3 . cutting. ™ Too large stroke disables looper thread from being clamped. Shorter stroke Longer stroke Remove hinge screw 4 , remove driving lever 5 , and make...
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Page 56: Adjustment Of Stationary Knife And Looper Thread Clamp Spring
Standard Adjustment 3) Adjustment of stationary knife and looper thread clamp spring Overlapping amount between the catching part 0.5 mm in pointed end of movable knife !0 and pointed end of stationary knife 9 is to be 0.5 mm. The distance from pointed end of movable knife ! 0 to clamp spring ! 1 is to be 3.2 mm from stationary knife 9 to the top end of flat spring !2 to be 0.5 mm. - Page 57 Adjustment Procedures Results of Improper Adjustment For the adjustment of stationary knife 9 and clamp spring !1 , ™ Too small overlapping amount of loosen 2 screws 7 and a screw 8 . catching part in pointed end of Be sure to retain the screw 8 which adjusts the clamping pressure movable knife with the stationary knife disables cutting of looper after thread trimming and make adjustment of clamping pressure...
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Page 58: Adjustment Of Operating Speed Of Thread Trimmer (Pneumatic Type)
Standard Adjustment 5) Adjustment of operating speed of thread trimmer (pneumatic type) Forward travel of movable knife Backward travel of movable knife 6) Confirmation of thread trimming − −... - Page 59 Adjustment Procedures Results of Improper Adjustment ™ The speed of the forward travel of movable knife is reduced by ™ Incorrect adjustment could turning the screw of speed controller @2 clockwise and increased c a u s e a b n o r m a l w e a r o f counter-clockwise.
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Page 60: Adjustment Of Pneumatic Lifter
Standard Adjustment 7) Adjustment of pneumatic lifter Left needle Spreader Spreader Max. 7.0 mm At the time of bottom dead point of needle At the time of top dead point of needle bar bar the presser foot should not contact the the left needle point should not go beyond underside of spreader when lifted. - Page 61 Adjustment Procedures Results of Improper Adjustment ™ Make adjustment by loosening the screw inside @9 so that @9 ™ Too short stroke could cause the is mounted around the intermediate point between 2 holes for insufficient lifting amount. the hook of lifter lever. ™...
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Page 62: Adjustment Of Tension Release (Equipped With Thread Trimmer)
Standard Adjustment 8) Adjustment of tension release (equipped with thread trimmer) 1 Disk floating timing When the presser foot is lowered : ™ Tongue #6 in 5 places is near thread tension disk # 7 and should not come in contact with it. (0.8 ™... - Page 63 Adjustment Procedures Results of Improper Adjustment 1 Disc float timing ™ Incorrect adjustment could ™ Make a provisional adjustment by cause defective stitch or stitch loosening screw #8 so that it is skip. situated at the center of eccentric nut #9 adjusting range. ™...
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Page 64: Adjustment Of Top Covering Thread Trimmer
Standard Adjustment 10) Adjustment of top covering thread trimmer Make adjustment such that the top covering thread cutting movable knife %1 comes to the center in V- shaped slot of spreader when the sewing machine is at rest, and does not contact the spreader % 2 and the top covering thread when the movable knife %1 is open. - Page 65 Adjustment Procedures Results of Improper Adjustment ™ Loosen the 2 screws %3 . Move the holder %4 so that the movable ™ Incorrect adjustment could knife %1 can come to the center in V-shaped slot of spreader. cause breakage of spreader, ™...
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Page 66: Assembling And Adjustment Of Fixed Cam Thread Take-Up
5. ASSEMBLING AND ADJUSTMENT OF FIXED CAM THREAD TAKE-UP (1) Parts used Standard Adjustment <Existing state> <Changed parts> − −... - Page 67 Adjustment Procedures Results of Improper Adjustment Deleted parts Added parts Name of part Part No. Name of part Part No. Needle thread US00050366B Needle bar cam US00050358Z strike-off asm. plate Needle bar guard US00050317C Needle bar guard US00050317E Needle bar thread US00050323P Needle bar fork US0050363CL...
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Page 68: Needle Bar Cam Plate And Needle Bar Fork Thread Take-Up
(2) Needle bar cam plate and needle bar fork thread take-up Standard Adjustment (3) Needle thread guide and medium thread path base Standard Adjustment 53 mm − −... - Page 69 Adjustment Procedures Results of Improper Adjustment ™ Adjust the vertical position of needle bar cam plate 4 and <When excessively hard-to-slip longitudinal position of needle bar fork thread take-up 6 so thread is used> that the hole for the right needle of needle bar fork thread take- Needle bar cam plate up 6 is as shown in the figure on the left-hand side when the ...
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Page 70: Spreader Thread Guide
(4) Spreader thread guide Standard Adjustment 1) Parts used 2) Assembling and adjustment of spreader thread guide To align height of holes (At the time of needle bar upper dead point) Use the thread hole located in extreme rear position. Normally, use the hole on lower side. -
Page 71: Other Precautions
Adjustment Procedures Results of Improper Adjustment Deleted parts Added parts Name of part Part No. Name of part Part No. Eyelet US00050392T Spreader thread US0050392BG guide ™ Remove eyelet !2 and install spreader thread guide !3 . The hole on the left-hand side of the ™... -
Page 72: Troubles And Corrective Measures
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Page 87: Drawing Of Table
5-ø8.5, ø26 Counterbore 1 deep with slot Drawer stopper installing position (back side) 81.5 50.5 Stand installing position Drawer installing position Push button switch mounting position JUKI logotype (810) Right side Z-Z (5 places) (ø26) Table Part No.30148654 (ø8.5) − − −... - Page 88 346 ±1 346 ±1 (22) 159 ±1 125 ±1 3-ø8.5, ø26 Counterbore 5 deep 5-ø10 264 ±1 379 ±1 (82.5) Table Part No.30148803 − − − −...
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Page 89: Desktop Type For Mf
152.5 379±1 Drawer installing position Stand installing position Push button switch mounting position 264±1 JUKI logotype (810) Right side Detailed measurement (2 : 1) Extracted characters : Helvetica Reg. Condensed Outline number Y - Y (3 places) Thickness : 1.5 (ø26) -
Page 90: Desktop Type For Mf With Fabric Under Trimmer
(back side) Z - Z (2 places) (241.5) 152.5 Drawer installing 379±1 position Stand installing position Push button switch mounting position JUKI logotype 264±1 (810) Right side (ø26) Y - Y (3 places) 30˚ (ø8.5) Table Part No. 30162101 −... -
Page 91: Desktop Type For Mfc
Drawer stopper installing position (back side) 5-ø26, 19 deep Drawer installing 70 ±1 position 262 ±1 242 ±1 Stand installing position Push button switch mounting position JUKI logotype (810) Right side (ø26) (ø8.5) Table Part No.30148001 − − − −... -
Page 92: Semi-Submerged Type For Mfc
1 deep with slot Drawer stopper installing position (back side) Drawer installing position Stand installing position Push botton switch mounting position 120 ±1 JUKI logotype (810) Right side Detailed measurement (2:1) Extracted characters:Helvetica Reg. Z-Z (7 places) Outlined number (ø26) Thickness:1.5 (ø8.5) -
Page 93: Semi-Submerged Down Table For Mfc
(6) Semi-submerged down table for MFC 413 ±1 5-ø26, 19 deep 70 ±1 262 ±1 242 ±1 4-ø10 120 ±1 (40) Table Part No.30148308 − − − −... - Page 94 Drawer stopper installing position (back side) 5-ø26, 19 deep 70±1 262±1 Drawer installing position Stand installing position 242±1 Push button switch mounting position (810) JUKI logotype Right side (ø26) 30˚ (ø8.5) Table Part No. 19254705 − − − −...
- Page 95 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright C 1997-2000 JUKI CORPORATION. All rights reserved throughout the world. 00 · 12 Printed in Japan (E)
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