34
8-5. Adjusting timing of needle and hook
1. Adjusting the height of the needle and the timing of hook
Turn the pulley manually so that the needle will be 1.8mm from the lowest position. Then adjust so that the edge of the hook
will be directly in the center of the needle. The height of the needle bar can be adjusted by loosening the clamp screw
①
. The
hook timing is adjusted by loosening the lower shaft collar clamp screw
②
and aligning the hook shaft gear
④
and the lower
shaft gear
⑤
and fixing the lower shaft collar
③
so that it will not move.
After this adjustment has been made, the hook edge will be placed 1mm above the needle
’
s thread hole top as in Figure 50.
2. Adjusting the clearance between the needle and the hook edge
When the needle goes up from the lowest point and the hook edge fits the needle center, loosen
①
,
②
,
③
,
④
,
⑤
in Figure 51
so that the clearance between the hook edge and the needle groove inside is within 0.05~0.1mm when the needle bottom touches
softly the needle guide plate
①
of the hook as seen in figure 52. Adjust the left and right sides
⑥
of the hook tray. (After
adjustment, tighten
①
,
②
,
③
,
④
,
⑤
.)
[ Figure 50 ]
[ Figure 52 ]
Hook edge
1mm
1.8mm
[ Figure 51 ]
Hook edge
Needle
Touching
part
0.05~0.1mm
①
②
④
⑤
③
①
①
⑥
③
④
⑤
②
Summary of Contents for KM-1957-7
Page 2: ......
