JUKI MB-1373 Engineer's Manual
  1. Manuals
  2. Brands
  3. JUKI Manuals
  4. Sewing Machine
  5. MB-1373
  6. Engineer's manual

JUKI MB-1373 Engineer's Manual

Single-thread, chain stitch, button sewing machine with thread-fray- prevention on/off changeover mechanism
Hide thumbs Also See for MB-1373:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual
Single-thread, chain stitch, button sewing machine with
thread-fray- prevention ON/OFF changeover mechanism
MB-1373
MB-1377
ENGINEER'S MANUAL
(Quick stitch-shape changing
mechanism)
®
40041089
No. E378-00

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MB-1373 and is the answer not in the manual?

Questions and answers

Related Manuals for JUKI MB-1373

Summary of Contents for JUKI MB-1373

  • Page 1 ® Single-thread, chain stitch, button sewing machine with thread-fray- prevention ON/OFF changeover mechanism MB-1373 MB-1377 (Quick stitch-shape changing mechanism) ENGINEER’S MANUAL 40041089 No. E378-00...
  • 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 in the Instruction Manual.

  • Page 3: Table Of Contents

    CONTENTS 1. Specifications ......................1 2. Standard Adjustment .................... 2 (1) Height of the needle bar ......................2 (2) Positioning the looper......................2 (3) Yoke-slide timing ........................4 (4) The floating timing of thread tension disc No.2 ..............4 (5) Height and pressure of the button clamp ................6 (6) Thread tension disc No.
  • Page 4 MEMO...

  • Page 5: Specifications

    TQx1 #16 (#14 ~ #20), (TQx7 #16 (#14 ~ #20)) JUKI NEW DEFLEX OIL No.1 or JUKI MACHINE OIL No. 7 Lubricating oil JUKI MACHINE OIL No. 7 (equivalent to ISO VG7) with an oiler Grease Exclusive grease Interlocked with the button clamp lifting mechanism.

  • Page 6: Standard Adjustment

    2. Standard Adjustment (1) Height of the needle bar Standard Adjustment Upper engraved lines on needle bar should be aligned with the bottom of lower bushing TQX1 TQX7 * The two upper engraved lines on needle bar should be used for adjustment when using a TQx1 needle, or the two lower ones should be used when using a TQx7 needle.
  • Page 7 Adjustment Procedure Results of Improper Adjustment 1. Depress the pedal fully forward, turn the needle driving pulley in the o If needle bar is too high, normal sewing direction by hand to bring down the needle bar to skipped stitches will be produced. the lowest position of its stroke and loosen screw o If the needle bar is too low, the 2.

  • Page 8: Yoke-Slide Timing

    (3) Yoke-slide timing Standard Adjustment 1. Crosswise travel timing of the yoke slide The height of ascending needle bar should be 4 to 7 mm when yoke slide begins to travel from left to right. Engraved marks Looper 0.05 to 0.1mm 2.
  • Page 9 Adjustment Procedure Results of Improper Adjustment To adjust the timing of the travel of yoke slide , align the engraved o If loop positioning finger triangu- lar cam begins to travel too late, marks of loop positioning finger cam and loop positioning finger thread breakage, excess thread, triangular cam with the engraved mark of cam and looper sleeve...

  • Page 10: Height And Pressure Of The Button Clamp

    (5) Height and pressure of the button clamp Standard Adjustment 1. The amount of lift of the button clamp : 8.5 to 9.5 mm 2. Pressure of the button clamp 28.5 to 29.5mm (6) Thread tension disc No. 1 Standard Adjustment At the time of stop-motion –...
  • Page 11 Adjustment Procedure Results of Improper Adjustment 1. Amount of lift of the button clamp o Increasing the lifting amount of the (1) The knife moves in accordance with the lifting of the button button clamp will increase the clamp. Therefore, the length of the remaining thread on the length of the remaining thread.

  • Page 12: Positioning The Thread Nipper

    (7) Positioning the thread nipper Standard Adjustment The clearance between thread nipper and nipper block should be 0.4 to 0.6 mm while the machine is in operation. 0.4 to 0.6mm (8) Adjusting the stitch selecting mechanism Standard Adjustment 1. Open the side cover (left). Change the number of stitches with stitch adjusting screw and stitch adjusting lever (accessory part).
  • Page 13 Adjustment Procedure Results of Improper Adjustment 1. Provide a 0.4 to 0.6 mm clearance between nipper block o If the clearance is too large, the nipper to prevent nipper from holding the threading while the thread from the needle will be- machine is in operation.

  • Page 14: Positioning The Stitch Adjusting Cam

    (9) Positioning the stitch adjusting cam Standard Adjustment The clearance between stitch adjusting roller and the recess of stitch adjusting cam should be 0.8 mm at the stop-motion position. Rotational direction Rotational direction of stop-motion disc. of stitch adjusting cam. Stop-motion position (10) Adjusting the stop-motion position Standard Adjustment...
  • Page 15 Adjustment Procedure Results of Improper Adjustment At the time of stop-motion of the machine, adjust so that a clearance of 0.8 mm is provided between stitch adjusting roller and the dent in stitch adjusting cam when stop-motion hook comes in contact with stop-motion disc and tighten setscrew Adjustment Procedure...

  • Page 16: Positioning The Stop-Motion Disc And The Stop-Motion Plunger

    (11) Positioning the stop-motion disc and the stop-motion hook Standard Adjustment The clearance between stop-motion hook and stop-motion disc should be adjusted to 0.5 to 1mm at the position which one stitch before the stop-motion position. 0.5 to 1mm * Turn the cam to the position of the previous stitch.
  • Page 17 Adjustment Procedure Results of Improper Adjustment 1. Turn stop-motion adjusting cam in direction A until it will go no o If the clearance is larger than 0.5 further. to 1 mm, unstable entrance into See “(10) Adjusting the stop-motion position.” the stop-motion state will result.

  • Page 18: Changing Over The Quick Stitch-Shape Changing Mechanism (Mb-1377)

    (12) Changing over the quick stitch-shape changing mechanism (MB-1377) Standard Adjustment Adjusting the mechanism for 2-holed button sewing and for 4-holed button sewing – 14 –...
  • Page 19 1. Measure the space between holes in a button (in mm). In the case of 4-holed buttons, the lengthwise feed amount and crosswise feed amount should be set at the same scale on the graduated plate. [For MB-1373] Lengthwise feed scale For 2-holed buttons, while keeping lengthwise feed adjusting lever pressed down, set the spring at "0"...

  • Page 20: Positioning The Feed Cam

    (13) Positioning the feed cam Standard Adjustment Align the engraved dot on the periphery of the feed cam (lengthwise feed cam , crosswise feed cam ) with pointer fixed on the bed at the time of stop-motion when performing sewing of buttons with 16 stitches. Engraved line (14) Positioning the button clamp lifting link Standard Adjustment...
  • Page 21 Adjustment Procedure Results of Improper Adjustment 1. Adjust so that stop-motion hook comes in contact with stop-motion o If the lengthwise feed cam disc at the stop-motion position. crosswise feed cam are incor- 2. To adjust longitudinal feed cam , align the engraved dot on the rectly positioned, the needle can cam with pointer fixed on the bed and tighten the setscrew in the...

  • Page 22: Positioning The Needle Driving Pulley Pressure Applying Lever

    (15) Positioning the needle driving pulley pressure applying lever Standard Adjustment The clearance at the stop-motion position (while the needle driving pulley is running idle) should be 0.3 to 0.6 mm. Needle driving pulley clutch Needle driving pulley 0.3 to 0.6mm (16) Positioning the thread pull-off lever Standard Adjustment Adjust the distance from thread guide pin...
  • Page 23 Adjustment Procedure Results of Improper Adjustment Loosen nut of the needle driving pulley pressure applying lever and o If the clearance is too large, the adjust it by screwing in and out screw clutch will slip, causing difficulty in The clearance will become larger by screwing it in. starting.

  • Page 24: Adjustments Of The Automatic Thread Trimmer

    3. Adjustments of the Automatic thread trimmer (1) The mechanism and the name of each component of the thread trimmer 1. When button clamp lifting lever is actuated at the last stitch, connecting link (rear) moves forward, causing thread separating claw of moving knife to separate thread before it is trimmed by the knife.
  • Page 25 Nipper bar bearing block Connecting link front Adjusting screw Washer Cushion Lifting lever Spring Thread trimming link Spring shoe Button clamp lifting link Button clamp lifting rod Thread trim lever base Throat plate Thread trimming lever Moving knife Connecting link rear Counter knife Joint stud Thread separating claw...

  • Page 26: Adjusting The Position Of The Moving Knife

    (2) Adjusting the position of the moving knife Standard Adjustment Adjust the position so that the distance between connecting link (front) and the edge of the slot in throat plate is 10 to 11 mm when the button clamp is at its highest position after the stop-motion has been set. 10 to 11mm (3) Adjusting the height of the thread separating claw of the moving knife Standard Adjustment...
  • Page 27 Adjustment Procedure Results of Improper Adjustment If the adjusted distance between the 1. Adjust so that stop-motion hook comes in contact with stop-motion connecting link (front) and the end of disc at the stop-motion position. the slot in the throat plate is smaller: 2.

  • Page 28: Clearance Between The Lifting Lever And The Adjusting Screw

    (4) Clearance between the lifting lever and the adjusting screw Standard Adjustment 0.4 to 0.5 mm (5) Installing the button clamp lifting rod Standard Adjustment – 24 –...
  • Page 29 Adjustment Procedure Results of Improper Adjustment 1. Adjust so that stop-motion hook comes in contact with stop-motion o If the adjustment value is too large, the moving knife will overrun. As disc at the stop-motion position. a result, the thread separating 2.

  • Page 30: Adjustments Of The Knot-Tying Mechanism

    4. Adjustments of the knot-tying mechanism (1) The mechanism and the name of each component of the knot-tying feature 1. When the machine is running, the stitch adjusting cam rotates and the roller rides over the thread bind notch , attached to the stitch adjusting cam , making the thread bind plate actuate by means of the respective links to the hook thread.
  • Page 31 Changing over activation/deactivation of the knot-tying mechanism To activate the knot-tying mechanism: Pulling knot-tying mechanism changeover knob toward you, position it as illustrated. To activate the knot-tying mechanism To deactivate the knot-tying mechanism: Pulling knot-tying mechanism changeover knob toward you, position it as illustrated.

  • Page 32: Adjusting The Thread Bind Arm Stopper

    (3) Adjusting the thread bind arm stopper Standard Adjustment (back) (4) Adjusting the thread bind notch Standard Adjustment – 28 –...
  • Page 33 Adjustment Procedure Results of Improper Adjustment 1. If roller of the knot-tying arm does not come into contact with knot-tying notch when staring the sewing machine, loosen screws and adjust with stopper so that outside periphery of the needle hole almost aligns with top end of the knot-tying plate.

  • Page 34: Adjusting The Lever

    (5) Adjusting the lever Standard Adjustment As a guide, the clearance provided between the end of thread guide and the tip of lever , at the time of stop-motion, should be 8 to 10 mm. (6) Adjusting the speed slowing friction plate Standard Adjustment When roller of the stitch adjusting arm rides over the outmost periphery of stitch adjusting cam...
  • Page 35 Adjustment Procedure Results of Improper Adjustment 1. Adjust so that stop-motion hook comes in contact with stop-motion o If the clearance is too large, disc at the stop-motion position. thread-breakage will occur. 2. When the machine is in the stop-motion state, loosen setscrew o If the clearance is too small, 3.

  • Page 36: Maintenance

    5. Maintenance (1) Applying the exclusive grease As long as the machine is normally used, no grease should be added. If the machine is used under severe conditions, periodical adding the exclusive grease (once every year or two) is one effective way to ensure smooth operation of the machine.
  • Page 37 3. LOOPER SHAFT MECHANISM COMPONENTS ∗ ∗ ∗ Underside ∗ ∗ ∗ ∗ ∗ ∗ ∗ Tooth plane ∗ ∗ ∗ ∗ ∗ ∗ ∗ : Exclusive grease ∗ – 33 –...
  • Page 38 4. NIPPER & THREAD TENSION PARTS COMPONENTS ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ : Exclusive grease – 34 –...
  • Page 39 5. FEED PLATE COMPONENTS ∗ Hole ∗ ∗ ∗ ∗ MB-1373 ∗ ∗ ∗ Hole ∗ Underside ∗ ∗ Inside ∗ Hole ∗ ∗ Inside ∗ ∗ Inside Groove MB-1377 ∗ ∗ ∗ Groove ∗ End face ∗ Groove ∗ ∗ ∗ ∗ ∗...
  • Page 40 6. BUTTON CLAMP LIFTER COMPONENTS ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ End face ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ : Exclusive grease ∗ – 36 –...
  • Page 41 7. NEEDLE DRIVING PULLEY SHAFT COMPONENTS ∗ Tooth plane ∗ ∗ Bearing section ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ : Exclusive grease – 37 –...
  • Page 42 8. NEEDLE BAR DRIVING MECHANISM COMPONENTS ∗ End face ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ : Exclusive grease 9. STOP MOTION MECHANISM COMPONENTS ∗ Contact plane of the stop-motion trip roller ∗ ∗ ∗ ∗ ∗ ∗...
  • Page 43 10.STITCH SELECTING PARTS COMPONENTS ∗ ∗ ∗ ∗ ∗ ∗ ∗ Tooth plane ∗ Tooth plane ∗ ∗ ∗ ∗ ∗ : Exclusive grease 11. THREAD BIND NOTCH COMPONENTS (For MB-1377) ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗...

  • Page 49: Table Diagram

    4x2 Drilling depth 10 (underside) Stand mounting hole 2 Drilling depth 10 (underside) Drawer stopper position 16 Depth 30 2 Drilling depth 10 (underside) 2x2 Drilling depth 10 (underside) Main switch position Drawer position JUKI logotype Part No. : 40040971 – 45 –...
  • Page 50 Please do not hesitate to contact our distributors or agents in your area for further information when necessary. * The description covered in this engineer's manual is subject to change for improvement of the Copyright © 2007 JUKI CORPORATION. commodity without notice.

This manual is also suitable for:

Mb-1377

Table of Contents

Save PDF