JUKI MF-7923 Instruction Manual
  1. Manuals
  2. Brands
  3. JUKI Manuals
  4. Sewing Machine
  5. MF-7923
  6. Instruction manual

JUKI MF-7923 Instruction Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

MF-7900
INSTRUCTION MANUAL
No.03
70002027
3

Advertisement

Table of Contents
loading

Related Manuals for JUKI MF-7923

Summary of Contents for JUKI MF-7923

  • Page 1 MF-7900 INSTRUCTION MANUAL No.03 70002027...

  • Page 2: Table Of Contents

    coNtENtS !. SPEcIFIcatIoNS ......................1 @. coNFIGuratIoN oF tHE MacHINE coMPoNENtS ..........2 #. INStaLLatIoN ......................3 1. Installing the machine head onto the table ................3 2. Selecting the motor pulley and the belt ................. 9 3. Installing the motor ........................9 4.

  • Page 3: Specifications

    Looper mechansm Sphercal rod drve method Lubrcatng system Forced lubrcaton method by gear pump Lubrcatng ol JUKI GENUINE OIL 8 Ol reservor capacty Ol gauge lower lne : 600 cc to upper lne : 900 cc Installaton Table-fixed type, Semi-submerged type...

  • Page 4: Configuration Of The Machine Components

    @. coNFIGuratIoN oF tHE MacHINE coMPoNENtS 1 Presser sprng regulator !4 Needle tp slcon ol lubrcatng unt 2 Needle bar thread take-up cover !5 Dfferental lock nut 3 Ol crculaton nspecton wndows !6 Mcro-adjustment knob 4 Ol hole cap !7 Fnger guard 5 Mcro-lfter !8 Rockng thread take-up 6 Needle thread slcon ol lubrcatng unt...

  • Page 5: Installation

    #. INStaLLatIoN WarNING : Do not insert the power plug of the motor into the receptacle until all works have been completed. there is a danger of injury by being caught in the machine. 1. Installing the machine head onto the table WarNING : the weight of the sewing machine is more than 42 kg.
  • Page 6 [For the direct-drive type] Attach the pns and the rubber cushons as shown n Table-fixed type the llustraton and properly nstall the sewng machne. 1 Rubber cushon (Black) x 2 2 Washer 3 Sprng washer 4 Nut 5 Pn 6 Rubber cushon (Gray) x 2 Attach the supportng board and the rubber seats as Semi-submerged type shown n the llustraton and properly nstall the sewng...
  • Page 7 1 DraWING oF taBLE (taBLE-FIXED tYPE) V-BELt tYPE – 5 –...
  • Page 8 2 DraWING oF taBLE (taBLE-FIXED tYPE) DIrEct-DrIVE tYPE – 6 –...
  • Page 9 3 DraWING oF taBLE (SEMI-SuBMErGED tYPE) V-BELt tYPE – 7 –...
  • Page 10 4 DraWING oF taBLE (SEMI-SuBMErGED tYPE) DIrEct-DrIVE tYPE – 8 –...

  • Page 11: Selecting The Motor Pulley And The Belt

    2. Selecting the motor pulley and the belt Motor pulley and belt * The table shows the numbers when a 3-phase 50Hz 60Hz 2-pole 400 W clutch motor ( / 2 HP) s used. Pulley sze Belt sze Pulley sze Belt sze Speed of * The commercally-avalable motor pulley near to sttch (st/mn)

  • Page 12: Installing The Belt Cover

    5. Installing the belt cover WARNING : Be sure to install the belt cover. If it is not installed, there is a danger of injury since hands or clothes may be caught in the machine or a danger of damage of the machine since sewing products may be caught in the machine.

  • Page 13: Installing The Needle Bar Thread Take-Up Cover

    When you operate the sewing machine for the first time or after an extended perod of dsuse, be sure to apply 2 to 3 drops of lubrcatng ol to needle bar 4 . For the lubrcatng ol, use JUKI GENUINE OIL 8. –  –...

  • Page 14: Silicon Oil Lubricating Unit

    3. Silicon oil lubricating unit Ths sewng machne s provded wth the slcon ol lubrcatng unt as standard. In case of sewng at a hgh speed, or usng chemcal thread or chemcal fabrc, use the slcon ol lubrcatng unt to prevent thread break- age or sttch skppng.

  • Page 15: Threading The Machine Head

    3. threading the machine head WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. If threading is wrong, stitch skipping, thread breakage, needle breakage or irregular stitches will be caused.

  • Page 16: Adjusting The Stitch Length

    4. Adjusting the stitch length WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. The stitch length can be infinitely adjusted from 0.9 mm to 3.6 mm.

  • Page 17: Adjusting The Presser Foot Pressure

    6. adjusting the presser foot pressure Decrease the presser foot pressure as low as possble to such an extent that sttches are stablzed. To adjust the pressure, loosen lock nut 2 of presser sprng regulator 1 and turn presser sprng regulator 1 . After the adjustment, tghten lock nut 2 .

  • Page 18: Adjusting The Sewing Machine

    ^. aDJuStING tHE SEWING MacHINE 1. adjusting the silicon container thread guide WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. 29 mm ) Loosen setscrews 1 .

  • Page 19: Adjusting The Rocking Thread Take-Up

    3. adjusting the rocking thread take-up WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. ) Loosen setscrew 1 .

  • Page 20: Adjusting The Looper

    6. adjusting the looper WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. [Longitudinal position] [Lateral position] Adjust so that the clearance between blade pont 5 of...

  • Page 21: Adjusting The Rear Needle Guard

    8. adjusting the rear needle guard WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. Adjust the lateral poston of rear needle guard 1 so that t receves the needle wthn the range of B when the needle s n ts lowest poston.

  • Page 22: Adjustment By The Eccentric Cam

    (2) adjustment by the eccentric cam ) Remove the top cover. 2） Loosen screw 1 . 3) Turn the eccentrc cam. The drecton of turnng the eccentrc cam and the relaton between the eccen- trc cam and the needle thread loop s shown n the followng table.

  • Page 23: Adjusting The Height Of The Feed Dog

    10. adjusting the height of the feed dog adjusting the height of the feed dog WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. Adjust the heght from the top surface of throat plate to the rear end of man feed dog to  mm when...

  • Page 24: Adjusting The Spreader Thread Guide And The Needle Clamp Thread Guide

    12. adjusting the spreader thread guide and the needle clamp thread guide WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. [Spreader thread guide] Adjust so that the clearance between spreader thread gude 2 and spreader 1 is 0.4 to 1.0 mm.

  • Page 25: Adjusting The Presser Foot Lift

    14. adjusting the presser foot lift adjusting the presser foot lift WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. To adjust the heght of the presser foot, adjust the heght of screw 1 so that the presser foot does not come in contact with other components and fix the...

  • Page 26: Adjusting The Feed Locus

    16. adjusting the feed locus WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. (1) changing the feed driving motion The tmng of feed drvng eccentrc cam of the feed mechansm can be retarded from the tmng obtaned...

  • Page 27: Retarding The Feed Rocking Motion

    (2) changing the feed rocking motion The tmng of feed rockng eccentrc cam of the feed mechansm can be retarded from the tmng obtaned by the standard adjustment. ) Loosen two setscrews of the feed rockng eccentrc cam. Carry out the adjustment when the hole n the feed rockng rod algns wth the screw of the feed rockng eccentrc cam.

  • Page 28: Adjustment Value Of Balloon

    17. adjustment value of balloon WarNING : to protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. When performng balloon sttch, carry out the adjust- ment referrng to the adjustment values descrbed below.
  • Page 29 3 Hauling amount of the looper thread cam The poston 6 mm lower than the standard poston (Standard: Algns wth the upper marker lne) Lower by 6 mm 4 Matchstick height Matchstck heght Rght needle 7mm Left needle 29mm 29mm 17mm 5 Needle bar thread take-up thread receiver The needle bar thread take-up thread recever algns...

  • Page 30: Maintenance

    In case of the new sewng machne, replace the lubr- catng ol (JUKI GENUINE OIL 8) wth new one after usng t for approxmately one month. Then replace the lubrcatng ol every sx months.

This manual is also suitable for:

Mf-7900

Table of Contents