JUKI MO-6100D Series Engineer's Manual
  1. Manuals
  2. Brands
  3. JUKI Manuals
  4. Sewing Machine
  5. MO-6100D Series
  6. Engineer's manual

JUKI MO-6100D Series Engineer's Manual

Dry-head, high-speed, overlock machine/safety stitch machine
Hide thumbs Also See for MO-6100D Series:
Table of Contents

Advertisement

Quick Links

Download this manual
R
DRY-HEAD, HIGH-SPEED, OVERLOCK MACHINE /
SAFETY STITCH MACHINE
MO-6100D series
ENGINEER'S MANUAL
40004771
No.E353-00

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MO-6100D Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for JUKI MO-6100D Series

Summary of Contents for JUKI MO-6100D Series

  • Page 1 DRY-HEAD, HIGH-SPEED, OVERLOCK MACHINE / SAFETY STITCH MACHINE MO-6100D series ENGINEER’S MANUAL 40004771 No.E353-00...
  • Page 2 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered by the Instruction Manual.

  • Page 3: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ..................... 1 (1) MO-6100D SERIES ......................1 2. MODEL NUMBERING SYSTEM ............... 2 3. STANDARD ADJUSTMENT ................4 (1) Adjusting the needle height.................... 4 (2) Positioning the throat plate .................... 4 (3) Installing position of the needle clamp ................. 6 (4) Adjusting the length of the lower looper holder (Applicable only to MO-6116D series) ................
  • Page 4 2) Pat No. of frame support plate bolt ......................48 5. ADJUSTMENT VALUES OF THE NEEDLE HEIGHT AND LOOPER TIMING..................49 (1) MO-6100D SERIES ......................49 6. TROUBLES AND CORRECTIVE MEASURES..........50 7. DIMENSIONS OF TABLE ................62 (1) Semi-sunken type ......................62 (2) Semi-sunken type (when SC-380 synchronizer is used) ...........

  • Page 5: Specifications

    Differential feed adjustment By lever with micro adjustment mechanism Weight 28 kg Lubrication system Complete non-lubrication system Lubricating oil JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Grease Exclusive grease (Part No. 23640204) Needle cooler Optional Needle thread cooler Optional...

  • Page 6: Model Numbering System

    2. MODEL NUMBERING SYSTEM MO-6100D SERIES MODEL NUMBERING SYSTEM 2 3 4 5 10 11 12 13 14 15 16 17 18 19 20 21 22 M O 6 1 3 to 6 Model classification Type classification 6104 1-needle 3-thread overlock...
  • Page 7 −  −...

  • Page 8: Standard Adjustment

    3. STANDARD ADJUSTMENT Standard Adjustment (1) Adjusting the needle height When the needle(s) is in the highest position, the needle height from the throat plate surface should be as shown below. (Unit : mm) 2-needle : right 6104D Model 1-needle/ 2-needle : left MO- 6104D -4 H...
  • Page 9 Adjustment Procedures Results of Improper Adjustment 1) Take off the upper cover, loosen setscrew 2 of needle driving ™ Any other needle height than forked crank 1 and move needle driving forked crank 1 up or specified here will badly affect down to adjust the needle height.

  • Page 10: Installing Position Of The Needle Clamp

    Standard Adjustment (3) Installing position of the needle clamp Needle clamp connecting stud 1 should fit with the bottom end of needle bar 2 or be spaced within 0 to 0.5 mm. 0 to 0.5 mm Butt the needle clamp with the bottom end of the needle bar.
  • Page 11 Adjustment Procedures Results of Improper Adjustment 1) Loosen setscrew 3 and adjust, by slightly turning needle clamp ™ If the clearance provided 4, the clearance provided between the right-hand side needle between the needle and the and the lower looper (for 2-needle overlock machine) and the looper is excessive, the needle clearance provided between the needle hole in the throat plate thread will be likely to skip at the...

  • Page 12: Adjusting The Lower Looper

    Standard Adjustment (5) Adjusting the lower looper 1) Returning amount of the lower looper The distance between the blade point of the lower looper and the center of the needle should be as follows when the lower looper is at the extreme left of its stroke. (Unit : mm) Dimension J Model...
  • Page 13 Adjustment Procedures Results of Improper Adjustment 1) Returning amount of the lower looper ™ Excessive return of the lower 1 Loosen setscrew 2 of lower looper support arm 1 and adjust looper tends to cause stitch lower looper 4 to make adjustment of the returning amount. skipping when filament thread is used.

  • Page 14: Position Of The Upper Looper Guide

    Standard Adjustment (6) Position of the upper looper guide Vertical position : To be in close contact with the frame guide surface. Laternal position : To be pressed against the upper looper guide support gauge 1. (Unit : mm) 7 5.5 13131909 13132006 Marker dot...
  • Page 15 Adjustment Procedures Results of Improper Adjustment 1) Fit upper looper guide support gauge 1 over gauge fixing pin ™ If the upper looper guide has 3 which has been driven in frame 2 and secure the gauge improperly positioned vertically, with an O ring.

  • Page 16: Positioning The Upper Looper Holder

    Standard Adjustment (7) Positioning the upper looper holder The distance between the bottom surface of the frame and the upper end of the upper looper holder pin 2 should be as shown below when the upper looper holder 1 is at the highest point of its stroke. Bottom surface of frame (Unit : mm) Model...
  • Page 17 Adjustment Procedures Results of Improper Adjustment 1) Loosen the setscrew of upper looper ball arm 3 and setscrew ™ Inaccurately positioned upper 5 of the upper looper holder. l o o p e r h o l d e r w i l l c a u s e 2) Adjust the clearances between upper looper bracket 4 and excessive projection of the upper looper holder 1 to approximately 0.2 mm respectively,...

  • Page 18: Positioning The Upper Looper

    Standard Adjustment (8) Positioning the upper looper 1) Height of the upper looper The distance between the throat plate surface and the blade point of the looper should be as follows when the upper looper is at the extreme left of its travel. (Unit : mm) Model Dimension...
  • Page 19 Adjustment Procedures Results of Improper Adjustment ™ If the upper looper has been 1) Height of the upper looper 1 Set a hexagon wrench key onto setscrew 2 at the end of upper p o s i t i o n e d t o o h i g h , a n looper bracket 1 to adjust height D.

  • Page 20: Adjusting The Double Chain Looper (Applicable Only To Mo-6116D Series)

    Standard Adjustment (9) Adjusting the double chain looper (Applicable only to MO-6116D series) 1) Returning amount of the double chain looper The distance between the needle center and the blade point of the double chain looper should be 1.4 to 1.7 mm when the looper is at the extreme left of its travel. 1.4 to 1.7 mm 2) Longitudinal motion (Avoid motion) The standard minor axis of the elliptical motion should be :...
  • Page 21 Adjustment Procedures Results of Improper Adjustment ™ Excessive return of the double 1) Returning amount of the double chain looper 1 Loosen setscrew 2 of double chain lopper driving arm 1 to chain looper will cause frequent make this adjustment. stitch skipping when filament 2 Radius M of the double chain looper driving arm 1 will be thread is used.

  • Page 22: Adjusting The Height And Clearance Of The Needle Guard

    Standard Adjustment (10) Adjusting the height and clearance of the needle guard 1) For 1-needle or 2-needle overlock machine The overlock machine has two needle guards, A and B. The needle guard B should be located 1 mm below the throat plate bottom surface. Needle guard Needle guard (Traveling needle guard)
  • Page 23 Adjustment Procedures Results of Improper Adjustment ™ Excessively close contact between 1) For 1-needle or 2-needle overlock machine the needle guard A and the 1 Adjust needle guard A with setscrews 1 in the needle guard so that needles will lead to needle bend it lightly comes in contact with the needle when the blade point of the or stitch skipping.

  • Page 24: Adjusting The Height Of The Feed Dog

    Standard Adjustment (11) Adjusting the height of the feed dog The height of main feed dog 2 from the top surface of the throat plate 1 should be as follows when it is at its highest posion. (Unit : mm) Needle Model Dimension A...
  • Page 25 Adjustment Procedures Results of Improper Adjustment 1) Adjust the height of main feed dog 2 to dimension A with ™ If the feed dogs are too high, the setscrew 5. needles will be deflected and 2) Adjust the height of differential feed dog 3 with setscrew 7 so broken when sewing heavy- that there is no difference in level between main feed dog 2 weight materials.

  • Page 26: Adjusting The Differential Feed Ratio

    Standard Adjustment (13) Adjusting the differential feed ratio Pin at its highest Pin at its position Washer lowest Center position of nut Lower marker line (Standard) (Max, stretching) (Max, gathering) Gathering: 1: 2 Gathering: 1:1.6 Gathering: 1: 4 Stretching: 1: 0.7 Stretching: 1:0.6 Stretching: 1: 1.3 (14) Longitudinal position of the feed dog...
  • Page 27 Adjustment Procedures Results of Improper Adjustment 1) Remove cover 1 on the rear of the frame and loosen main feed pin and nut 3. 2) Move main feed pin 2 up or down to adjust the differential feed ratio. 3) Adjust so that the lower engraved marker line on main feed rocker 4 aligns with the center of nut 3.

  • Page 28: Adjusting The Presser Foot

    Standard Adjustment (15) Adjusting the presser foot 1) Adjusting the tilt of the presser foot The presser foot should be positioned so that the feed dogs go down under the specified presser foot pressure, and the presser foot sole comes in contact evenly with the throat plate surface. Throat plate 2) Adjusting the micro-lifting mechanism of the presser foot − ...
  • Page 29 Adjustment Procedures Results of Improper Adjustment 1) Adjusting the tilt of the presser foot ™ Uneven contact will result in bad 1 Turn the handwheel and place the feed dog in the position straight material feed and weak where the feed dog does not jut out the top surface of the throat feed force.

  • Page 30: Positioning The Upper Knife Arm Shaft

    Standard Adjustment (16) Positioning the upper knife arm shaft The upper knife shaft should be positioned 34 mm above the top surface of the throat plate when it is at its highest position. 34 mm (17) Positioning the upper and lower knives, and available overedge widths 1) Lower knife Throat plate Lower knife...
  • Page 31 Adjustment Procedures Results of Improper Adjustment 1) Remove the upper cover, loosen setscrew 2 in upper knife ™ Improperly positioned upper driving arm 1, and turn upper knife shaft 3 to adjust the position knife arm shaft will come in from the top surface of the throat plate to 34 mm.

  • Page 32: Resharpening Of The Knife

    Standard Adjustment (18) Resharpening of the knife Lower knife gauge Part No. 11996907 55˚ 10˚ (19) Position of the thread cam (Applicable only to MO-6116D series) 1) Adjustment of the thread cam Level 2) Adjusting looper thread cam thread guides A and B and the looper thread cam nail Level − ...
  • Page 33 Adjustment Procedures Results of Improper Adjustment ™ If the 10˚ angle of the lower knife 1) When the knives have become dull, fully resharpen lower knife 1 until the contact mark of it disappears. is exceeded, the durability of the 2) When the upper knife has become dull, replace it with a new knife will be deteriorated, often one.

  • Page 34: Adjusting The Looper Thread Auxiliary Thread Take-Up Lever (Exclusive For 30P)

    Standard Adjustment 3) Adjusting the looper thread auxiliary thread take-up lever (Exclusive for 30P) When looper thread auxiliary thread take-up lever 2 is in its lower dead point, the thread hole should align with the hole in looper thread auxiliary thread take-up lever guide 1. The holes should align with each other at the lower dead point.
  • Page 35 Adjustment Procedures Results of Improper Adjustment 1) Open the cloth base cover and loosen setscrew 3. 2) When looper thread auxiliary thread take-up lever is in its lower dead point (when the feed dog goes back to the end), tighten setscrew 3 so that the thread hole in looper thread auxiliary thread take-up lever 2 aligns with the thread hole in looper thread auxiliary thread take-up lever guide 1.

  • Page 36: Adjusting The Throat Plate Support

    Standard Adjustment (20) Adjusting the throat plate support Uniform contact (21) Adjusting the feed mechanism cover presser (22) Adjusting the looper cover ™ The looper cover should smoothly close without coming in contact with upper knife 1 when slowly closing looper cover 2 with upper knife 1 in its lowest position of its troke. Cloth chip cover Frame...
  • Page 37 Adjustment Procedures Results of Improper Adjustment 1) Loosen setscrews 1 and adjust so that throat plate support 2 ™ If the throat plate support comes should not come in single-sided contact but come in uniform in single sided contact with the contact with throat plate 3 using setscrews 1.

  • Page 38: Adjusting The Cloth Chip Cover

    Standard Adjustment (23) Adjusting the cloth chip cover ™ When cloth chip cover 3 is pressed away from you, it should not rattle. In addition, the cloth chip cover should not come in contact with upper knife 1 and lower looper 4. (There are 2 pcs.
  • Page 39 Adjustment Procedures Results of Improper Adjustment 1) Loosen setscrew 5 and temporarily tighten the setscrew with cloth chip cover stopper 6 raised. 2) Loosen setscrews 7 in the cloth chip cover, and adjust the longitudinal position of cloth chip cover 3. 3) Loosen setscrew 5 in the cloth chip cover stopper again, and press cloth chip cover stopper 6 downward until the stopper slightly comes in contact with looper cover 2.

  • Page 40: Position Of The Thread Guides And The Looper Thread Take-Ups

    Standard Adjustment (24) Position of the thread guides and the looper thread take-ups MO-6104D MO-6116D MO-6114D Needle thread Needle thread take-up lever of guide 2-needle machine Needle thread Needle thread take-up take-up lever of Needle thread take- Needle Needle thread guide of double- up guide of double- thread guide...
  • Page 41 Adjustment Procedures Results of Improper Adjustment ™ Distance a 1) Perform the adjustment by the setscrews. Position of the needle thread guide 1 and needle thread take up 2 lever is a very W h e n s e t s m a l l e r , b e t t e r important decisive factor when making soft chains since the tightness of needle thread needle thread take-up amount is increased in this case.

  • Page 42: Adjusting Soft Chain Making Mechanism

    Standard Adjustment (25) Adjusting soft chain making mechanism 1) Replacing the parts with those exclusively designed for making soft chains 1 Needle thread presser plate C ..12112504 Cam face 2 Driving cam ........12112603 3 Needle thread presser spring B ..12112702 4 Throat plate ........

  • Page 43: Important Points In Adjustment

    3) Important points in adjustment 1 Increase the thread take-up amount of the needle thread take-up lever. Refer to the adjustment values related to the needle thread guide and needle thread take-up lever. 2 Reduce the feed of the looper threads. (Mainly lower looper thread) Set J, K, L and M for the soft chain distances.

  • Page 44: Additional Information And Precautions

    4. ADDITIONAL INFORMATION AND PRECAUTIONS (1) Removing the air vent cap Remove air vent cap 1. (When transporting the sewing machine, be sure to attach air vent cap 1.) (Caution) 1. When the sewing machine is operated without removing air vent cap 1, oil leakage may occur.

  • Page 45: Center-To-Center Distance Of The Upper Looper Holder

    Apply the sealant to the bottom surface of the upper looper guide support 3, which contacts with the frame surface. 3 After assembling the front edge of the upper looper guide support 3 (JUKI seal), apply the sealant to 1 2 3 4 5 6 7...
  • Page 46 7 Various sealants * : It is commonly called “JUKI seal”. Maker’s name Part No. Three Bond 1104D * Three Bond 1104 Three Bond 1212 JUKI exclusive part Nos. of the above 3 kinds of the sealants are not set. −  −...

  • Page 47: Precautions To Be Taken With Respect To The Lubricating Components

    2) Precautions to be taken with respect to the lubricating components 1 Feed bar components ™ Be careful of the orientation of the oil shield rubber 4 and the dust-proof rubber 5. * Assembling as shown in the illustration will result in oil leakage.

  • Page 48: Applying The Exclusive Grease

    3) Applying the exclusive grease ™ The exclusive grease (23640204) is applied to the necessary components other than the lubricating components. Never use any grease other than the exclusive one. It is not necessary to additionally apply grease to the components when the sewing machine is used under the normal condition.
  • Page 49 3 Feed components (1) 4 Feed components (2) −  −...
  • Page 50 5 Upper looper components 6 Double chain looper components (For MO-6116D) −  −...

  • Page 51: Kinds Of Motor Pulleys, Belts And Frame Support Plate Bolts

    (6) Kinds of motor pulleys, belts and frame support plate bolts 1) Motor pulleys and belts 60 Hz Sewing 50 Hz speed of Outside diameter V-belt Outside diameter V-belt sewing of motor pulley mm of motor pulley mm Semi- Fully- Semi- Fully- machine...

  • Page 52: Pat No. Of Frame Support Plate Bolt

    2) Pat No. of frame support plate bolt 1 Semi-sunken type Support plate bolt (A) 13155007 Locknut NS6240630SE Washer WP1002036SE Spring washer WS1002560KR 2 Fully-sunken type Support plate bolt (C) 13155106 Support plate bolt (D) 13155205 Locknut NS6240630SE x 12 Washer WP1002036SE x 12...

  • Page 53: Adjustment Values Of The Needle Height And Looper Timing

    5. ADJUSTMENT VALUES OF THE NEEDLE HEIGHT AND LOOPER TIMING (1) MO-6100D SERIES (Unit : mm) Needle height Upper looper components Lower looper components Double-chain looper Description 1- needle overlock 2- needle overlock 1-needle 2-needle Upper looper Projection of Height of pin...

  • Page 54: Troubles And Corrective Measures

    6. TROUBLES AND CORRECTIVE MEASURES Trouble Case (1) Case(2) Check and Corrective measures Page 1. Needle thread breakage Threading The thread is entangled with the thread guide, or the Refer to the threading diagram. machine head has been incorrectly threaded. Thread path Scratches, burrs or rust on the pawls or needle holes of Remove such scratches, burrs, etc.
  • Page 55 Trouble Case (1) Case(2) Check and Corrective measures Page 2. Looper thread breakage Thread path Scratches, burrs, rust, etc, on the paw of the throat plate, Remove such scratches, burrs, etc. and carry out thread stitch tongue, looper, looper thread take-up, thread path finishing.
  • Page 56 Trouble Case (1) Case(2) Check and Corrective measures Page From the previous page Needle guards A needle guard has been improperly positioned, causing Refer to the pertinent Standard Adjustment. the needle point to strike it. Needle No. The needle is too thin for the materials. Replace the needle with a thicker one.
  • Page 57 Trouble Case (1) Case(2) Check and Corrective measures Page From the previous page Height of needle The needle has incorrect height and does not properly Refer to the related Standard Adjustment. 4, 8 pick up loops even if the looper has a correct return. Needle heat Stitch skipping occurs before the thread breaks due to Refer to the clause relating to the needle thread breakage...
  • Page 58 Trouble Case (1) Case(2) Check and Corrective measures Page 7. Upper looer thread stitches are skipped. Threading The thread has been entangled with a thread guide. See the threading diagram. Threading has not been done correctly. The needle does not take the upper looper Needle height The needle, if positioned too high or low, may fail to Refer to the related Standard Adjustment...
  • Page 59 Trouble Case (1) Case(2) Check and Corrective measures Page From the previous page Adjustment of looper Clearance or returning amount is not correct. Refer to the related Standard Adjustment. Thread tension The thread tension is too high, preventing formation of Reduce the tension.
  • Page 60 Trouble Case (1) Case(2) Check and Corrective measures Page 10. Triangle double chain needle thread stitches Double chain looper The chain looper is too high and too close to the throat Correct the height of the chain looper by pushing it down are skipped.
  • Page 61 Trouble Case (1) Case(2) Check and Corrective measures Page 12. Problems with double chain stitch chain-off Adjustment of loopers Adjustment of the loopers for producing chain-off thread Refer to the related Standard Adjustment. thread. without materials requires higher accuracy. Needle Guard The needle guard (C) is too high, damaging loops.
  • Page 62 Trouble Case (1) Case(2) Check and Corrective measures Page 13. Overlocking needle thread is loose. Position of the needle thread take-up guide and They are positioned too high, and the thread take-up Refer to the pertinent Standard Adjustment. needle thread guide draws out excessive needle thread.
  • Page 63 Trouble Case (1) Case(2) Check and Corrective measures Page 16. Uneven double chain stitches Thread tension The looper thread tension is not enough. Slightly increase the tension. Presser foot The presser foot comes into contact with the throat plate Make the presser foot come into contact with the throat unevenly.
  • Page 64 Trouble Case (1) Case(2) Check and Corrective measures Page 20. Uneven material feed Presser foot pressure The presser foot pressure is too high. Reduce the presser foot pressure except for the uneven material feed due to packering. Presser foot The hinge is too stiff. Remove the stiffness provided no hinge play is produced.

  • Page 66: Dimensions Of Table

    (26) 125±1 37.5 Leg installing position Push button switch installing position (806) JUKI logotype Top of table Type : Helvetica Reg. Condensed Detail drawing of measure (2:1) Condensed voided letters This plane is finished (ø26) (ø26) in the method same as 37.5...

  • Page 67: Semi-Sunken Type (When Sc-380 Synchronizer Is Used)

    42±1 125±1 (37.5) Leg installing position Push button switch installing position (806) JUKI logotype Top of table Type : Helvetica Reg. Condensed Detail drawing of measure (2:1) Condensed voided letters This plane is finished (ø26) (ø26) in the method same as the outside wood.

  • Page 68: Fully-Suken Type

    Location of silk screening on the table surface Brand label location indicating of drawing Screw Lid support plate Section Z-Z Section Y-Y Section X-X ø26 (ø26) 30˚ JUKI logotype (silk screening) (Note) All dimensions are in millimeter. (ø10) (ø8.5) Part No. of table : 11959558 − −...
  • Page 69 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright c 2003 JUKI CORPORATION. All rights reserved throughout the world. 03 · 03 Printed in Japan (E)

This manual is also suitable for:

Mo-6104dMo-6114dMo-6116d

Table of Contents