JUKI MO-644DN Instruction Manual
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JUKI MO-644DN Instruction Manual

2-needle, 2/3/4-thread overlock sewing machine
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2-Needle, 2/3/4-Thread Overlock Sewing Machine
MO-644DN/654DEN
INSTRUCTION MANUAL
MO-644DN
IMPORTANT:
Read all safety regulations carefully and under-
stand them before using your sewing machine.
Retain this instruction manual for future reference.
MO-654DEN
EN

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Summary of Contents for JUKI MO-644DN

  • Page 1 2-Needle, 2/3/4-Thread Overlock Sewing Machine MO-644DN/654DEN INSTRUCTION MANUAL MO-644DN MO-654DEN IMPORTANT: Read all safety regulations carefully and under- stand them before using your sewing machine. Retain this instruction manual for future reference.

  • Page 2: Safety Instructions

    “IMPORTANT SAFETY INSTRUCTIONS” When using an electrical appliance, basic safety precautions should always be followed, including the following: Read all instructions before using this sewing machine. “DANGER To reduce the risk of electric shock:” ____ 1. The appliance should never be left unattended when plugged in. 2.
  • Page 3 Congratulations on your purchase of a JUKI sewing machine. Please be sure to read safety precautions in “To use the sewing machine safely” in the Instruction Manual before use to fully understand the functions and operating procedures of the sewing machine so as to use the sewing machine for a long time.
  • Page 4 WARNING For the combination of the material and the thread and needle, in particular, refer to the explanation table in “Replacement of the needle”. If the needle or thread does not match the material used such as in the case that an extra heavy- weight material (e.g., denim) is sewn with a thin needle (#11 or higher), the needle can break result- ing in an unexpected personal injury.

  • Page 5: Table Of Contents

    Contents 2/3-thread converter Safety instructions ·····································1-3 Contents···················································· 4 • How to use the 2/3 thread converter ············23 Details of the machine ································ 5,6 Trial sewing • Accessories ············································· 6 • After threading, make a trial sewing ·············24 Assembling thread stand ····························7-8 Preparing the machine ·································...

  • Page 6: Details Of The Machine

    Details of the machine Details of the machine Thread guide Open thread guide Retractable support rod Left-hand needle thread tension dial Presser foot adjusting screw Right-hand needle thread tension dial Thread guide plate Presser foot lifter Thread take-up cover Spool holder pin LED light Anti-vibration cone Presser foot lifter...

  • Page 7: Accessories

    Details of the machine View with cloth plate open Lower knife adjusting knob Stitch length adjusting knob (MO-644DN) Differential feed adjusting knob (MO-644DN) Accessories Foot controller Needle in the needle box Small screwdriver Large screwdriver (MO-654DEN) Lower knife (MO-654DEN) Oiler...

  • Page 8: Assembling Thread Stand

    Assembling thread stand Raise the support rod fully Turn the thread stand until it engages the positioning stopper (A) with a click. Put the thread guide on the support rod Insert the thread guide into the tip of the support rod so that the ar- row in the thread guide comes in front of you.
  • Page 9 Assembling thread stand For overlock spools For large spools For spools of large inside diameter, position the anti-vibration come upside down. For small house-use spools When using house-use spools, remove the anti-vibration cones. Place a spool on the spoolholder with its notch downward and push the spool caps on with the rounded outside edge at the bottom.

  • Page 10: Preparing The Machine

    2. Be sure to remove the power plug from the wall outlet. 3. Do not place a thing on the foot controller. MO-644DN On/Off of the power/light switch The power/light switch is conveniently placed on the handwheel side of the machine in front of the socket.

  • Page 11: Operation And Function

    Operation and function Handwheel (Pulley) The handwheel turns toward you. * Upon completion of threading, at sewing start or sewing end, be sure to turn the handwheel toward you. Opening and closing the looper cover Opening: To open the looper cover, pull the looper cover opening handle to the right, and tilt the looper cover toward you.

  • Page 12: Presser Foot Lifter

    Operation and function Presser foot lifter (To raise the presser foot by the presser foot lifter) A For regular sewing operation (sewing a medium-weight material), raise the presser foot to position (A) illustrated in the figure. B When you sew a heavy-weight material, raise the presser foot to position (B) illustrated in the figure, to provide more space be- tween presser foot and throat plate.

  • Page 13: Raising The Upper Knife

    Operation and function Raising the upper knife Be sure to turn the power switch OFF. 1. Turn the handwheel until the upper knife is fully raised. Open the looper cover. 2. Press the part indicated as (A) in the figure toward the right until it will go no further.

  • Page 14: Stitch Length Adjusting Knob

    * For normal overlocking stitches set the stitch length adjusting knob at 2 to 3. MO-654DEN MO-654DEN MO-644DN MO-644DN Differential feed adjusting knob (to adjust the feeding for gathering or stretching) To adjust feeding for gathering or stretching, turn the differential feed adjusting knob upward or downward.

  • Page 15: Overlocking Width Selection Knob

    Operation and function Overlocking width selection knob (for overlocking or roll hemming) * Turn the handweel until the needles are fully raised. • For overlocking: Push the overlocking width selection knob back so that it aligns with the rear red marking on the throat plate. •...

  • Page 16: Changing The Needles

    Operation and function Changing the needles Be sure to turn the power switch OFF. • Applying the needle attaching hole (A) of the cleaning brush will help replace the needle ease. 1. Turn the handwheel until the needle are fully raised. 2.

  • Page 17: Threading

    Threading Be sure to turn the power switch OFF. Thread the machine carefully and in the correct sequence. This is important for marking beautiful seams. Preparation 1. Retractable support rod with thread guide must be fully raised. 2. Open the looper cover and cloth plate. 3.

  • Page 18: Upper Looper Thread (Blue)

    Threading (1) MO-644DN/654DEN 1. Upper looper thread (Blue) Place the spool on the spool holder pin right under blue marking on the retractable support rod thread guide. (1) Bring thread up from the rear of the retractable support rod thread guide with blue marking.

  • Page 19: Lower Looper Thread (Red)

    Threading (2) MO-654DEN 2. Lower looper thread (Red) Place the spool on the spool holder pin right under red marking on the retractable support rod thread guide. (1,2) Bring thread up from the rear of the retractable support rod thread guide to the front of it. (3,4) Pass the thread through the thread guide plate.
  • Page 20 Threading (2) MO-644DN MO-644DN only: (13) Using the looper threader, pass the threader from the right through to the left of the sewing machine. Turn the handwheel toward you until the lower looper is in the left-most position. Insert the thread into the slit on the lower looper.

  • Page 21: Right-Hand Needle Thread (Green)

    Threading (3) MO-644DN/654DEN 3. Right-hand needle thread (Green) Place the spool on the spool holder pin right under the green mark- ing on the retractable support rod thread guide. (1,2) Bring thread up from the rear of the retractable support rod thread guide with the green markings to the front of it.

  • Page 22: Left-Hand Needle Thread (Yellow)

    Threading (4) MO-644DN/654DEN 4. Left-hand needle thread (Yellow) Place the spool on the spool holder pin right under the yellow mark- ing on the retractable support rod thread guide. (1) Bring thread up from the spool to the thread guide and take it through the yellow thread guide.

  • Page 23: 3-Thread Overlocking

    3-thread overlocking 4 mm wide 3-thread Overlocking (Right-hand needle) (Blue, red and green) * Remove the left-hand needle. Thread in the following order. (1) Upper looper thread (Blue) (2) Lower looper thread (Red) (3) Right-hand needle thread (Green) * If the machine is already threaded with the left-hand needle thread, cut off and remove the thread.

  • Page 24: 2/3-Thread Converter

    2/3-thread converter MO-654DEN How to use the 2/3 thread converter: 2-thread flatlock Be sure to turn the power switch OFF. * This attachment enable the 1-needle type machine to perform overedging or decorative-stitching for 1-ply fabric. It enables the 2-needle type machine to perform 3-thread super stretch stitch- 2-thread wrapped overlock ing.

  • Page 25: Trial Sewing

    Trial sewing After threading, make a trial sewing Be sure to use a double layer of fabric in order to check whether the seam and thread tension are adequate. 1. Set the lower/upper looper, left-hand/right-hand needle thread tension dial “4”. 2.

  • Page 26: Adjusting The Thread Tension

    Adjusting the thread tension Adjusting the thread tension Turn the thread tension dial in the direction of the arrow, and make a trial sewing. A: If the upper looper thread meet on the underside of the fabric. B: If the lower looper thread meet on the upper side of the fabric. C: If the right-hand needle thread forms loops on the underside of the fabric.

  • Page 27: Roll Hemming

    Roll hemming ③ ② ① MO-654DEN MO-644DN ④ ④ Roll hemmer The roll hemmer is built-in to the sewing machine. The fabric edge is automatically rolled and oversewn. The result is a very fine and narrow edge finishing. Preparation for roll hemming: 1.

  • Page 28: Sewing In Tape

    Sewing in tape Sewing in tape The standard presser foot is equipped with a tape guide. When sewing shoulders or side seams of stretchy fabrics as a knitted fabric, a tape works effectively to prevent undesirable stretch of the fabric. 1.

  • Page 29: Differential Feed (Mo-654Den)

    MO-654DEN Gathering and stretching of the fabric can be adjusted by adjusting the differential feed adjusting knob (differentiate the feeding amount MO-644DN of front feed dog (A) or rear feed dog (B)). After adjusted, be sure to sew on trial.

  • Page 30: Gathering (Mo-654Den)

    * Gathering (MO-654DEN, 644DN) Gathering 1. A single layer of light-weight fabric can be gathered. 2. Set the stitch length adjusting knob at max. “4”. 3. Set the differential feed adjusting knob at “1.5 - 2”. For examples: Sleeve heads, lower edges, yokes, lace edging or frills * When sewing without differential feed, set the differential feed ad- justing knob at “N”.

  • Page 31: Thread Breakage During Sewing

    Thread breakage during sewing Thread breakage during sewing 1. Turn the workpiece at a right angle direction and stop sewing im- mediately. The remove the workpiece. 2. Rethread * If the lower looper thread is broken, cut the both needle threads off at the needle.

  • Page 32: Maintenance

    Maintenance WARNING : Please refer to the safety instructions. Changing the upper knife The upper knife (moving knife) is made from special hardened ma- terial. Replace the upper knife only when the knife blade tip is damaged. For a replacement, contact your local dealer. Changing the lower knife Main switch off “O”.

  • Page 33: Measures

    Maintenance Before you call for help: Trouble and corrective measures The following problems should not be regarded as the machine trouble. Check the following table before you call for help from us. Trouble Cause (reason) Corrective measures Page Fabric does not feed •...

  • Page 34: Specifications

    Specifications Item Specifications Number of threads 4 threads, 3 threads, 2 threads Needles Right-hand needle 130/705H Left-hand needle 130/705H (JL×2) Overlocking width Left-hand needle: 6 mm Right-hand needle: 4 mm (for roll hemming: 2 mm) Stitch length (feeding 1 to 4 mm amount) (standard stitch length: 2.5 mm) Differential feed...

  • Page 35: Optional Accessories

    Optional Accessories • Blind stitch presser foot • Gathering presser foot A9810 634 0A0A A9860 655 0A0C • Elasticator • Piping presser foot A9815 655 0A0A A9865 655 0A0A • Cording presser foot • Beading presser foot A9820 655 0A0A A9870 634 0A0A •...
  • Page 36 2-11-1, TSURUMAKI, TAMA-SHI, TOKYO, 206-8551, JAPAN PHONE : (81)42-357-2341 FAX : (81)42-357-2379 Copyright © 2020 JUKI CORPORATION All rights reserved throughout the world. 40239271 002003...

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