Adjusting Needle-To-Inner Hook Timing (Same Adjustment For This Side And Far Side) - JUKI MOL-254 Engineer's Manual

3) Adjusting needle-to-inner hook timing (Same adjustment for this side and far side)

1) Needle bar timing
When the needle bar goes up from its lowest dead point, the lower engraved marker line on the
needle bar is aligned with the end face of the needle bar lower bushing. (Fig. 1)
2) Hook timing
The center of the needle is aligned with the blade point of inner hook (section
1) (Fig. 2)
3) Clearance provided between the needle and the shuttle driver
Clearance provided between the needle and the shuttle driver is 0 mm at the time of step 2). (Fig. 3)
4) Clearance provided between the needle and the blade point of inner hook (Adjustment of the 2nd
hook)
Clearance provided between the needle and the blade point of inner hook (section
to 0.1 mm at the time of step 2). (Fig. 4)
5) Clearance provided between the needle and the shuttle
Clearance provided between the side face of needle and the shuttle is 7.5 mm. (Fig. 5)
6) Clearance provided between the inner hook and the shuttle driver is 0.5 to 0.7 mm. (Fig. 2)
1) Needle bar timing
Fig. 1
3) Clearance provided between needle and shuttle
driver
Shuttle driver
5) Clearance provided between needle and shuttle
Standard Adjustment
Lower engraved
marker line
0 mm
Fig. 3
7.5 mm (0.294")
Shuttle
Fig. 5
2) Hook timing
0.5 to 0.7 mm
(0.019 to 0.028")
Inner hook
4) Clearance provided between needle and blade
point of inner hook
41
− −
) at the time of step
) is 0.05 mm
Adjust to 0 mm
when adjusting
hook timing.
0 mm
Fig. 2
0.05 to 0.1 mm
(0.002 to 0.004)
Fig. 4