Table Of Contents - JUKI MOL-254 Engineer's Manual

1. SPECIFICATIONS ...................................................................................... 1
2. NAMES AND FUNCTIONS OF COMPONENTS ........................................ 3
[1] Names and functions of the main unit.................................................................. 3
[2] Names and functions of operation box panel ...................................................... 4
3. TIMING CHART .......................................................................................... 6
4. STANDARD ADJUSTMENT ...................................................................... 7
[1] Machine head components.................................................................................... 7
(1) Adjustment of the main shaft components .................................................................................... 7
1) Removing the play of main shaft ................................................................................................ 7
2) Installing the main shaft coupling ............................................................................................... 7
3) Adjusting the main shaft sensor ................................................................................................. 9
4) Stretching the timing belt (Main shaft-to-hook driving shaft for the front side timing) ................ 9
5) Adjusting the idler .................................................................................................................... 11
(2) Adjusting the hook driving shaft components .............................................................................. 11
1) Adjusting the longitudinal position of the oscillator .................................................................. 11
2) Adjusting the backlash of the oscillator gear ............................................................................ 13
3) Removing the play of the hook driving shaft ............................................................................ 13
(3) Adjusting the thread trimmer mechanism components ............................................................... 15
1) Adjusting the position of the thread trimmer cam .................................................................... 15
2) Adjusting the thread trimmer link stopper screw ..................................................................... 15
3) Adjusting the thread trimming cylinder (front side) .................................................................. 17
4) Position of the thread trimmer shaft ......................................................................................... 19
5) Position of the cam follower stopper ........................................................................................ 19
6) Position of the thread trimming solenoid .................................................................................. 21
7) Adjusting moving and counter knives ...................................................................................... 23
8) Height of the moving and counter knives ................................................................................. 25
9) Parallelism of the blade tip of the counter knife ....................................................................... 25
10) Adjusting the thread trimmer cam timing (only for this side) .................................................. 27
(4) Adjusting the tension release mechanism components .............................................................. 27
1) Installing position of the tension release notch ........................................................................ 27
2) Position of the tension release stopper .................................................................................... 29
3) Releasing amount of the thread tension disk ........................................................................... 29
(5) Adjusting the sensor components ............................................................................................... 31
1) Adjusting the Y origin sensor ................................................................................................... 31
2) Adjusting the X origin sensor ................................................................................................... 31
(6) Adjusting the feed mechanism components ................................................................................ 33
1) Adjusting the position of the X/Y motors .................................................................................. 33
2) Adjusting the position of the cloth presser foot ........................................................................ 35
3) Adjusting the position of the cloth presser lower plate ............................................................. 37
4) Adjusting the lift of the cloth presser foot ................................................................................. 37
(7) Adjusting the position of the needle bar and the hook ................................................................ 39
1) Adjusting the height of the needle bar ..................................................................................... 39
2) Changing the position of the throat plate (hook base) (Adjustment of the 1st hook) ............... 39
3) Adjusting needle-to-inner hook timing (Same adjustment for this side and far side) ............... 41
4) Adjusting the position of the shuttle upper spring (Same adjustment for this side and far side) ..... 43
5) Form of the inner hook presser ................................................................................................ 43
6) Adjusting the timing of the hook on this side ............................................................................ 45
7) Adjusting procedure of the hook removing sensor ................................................................... 47
8) Adjusting the play in the hook removing ball screw ................................................................. 49
(8) With regard to sewing .................................................................................................................. 51
1) Adjusting the thread take-up spring ......................................................................................... 51
2) Adjusting the position of the wiper ........................................................................................... 53
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