SunStar KM-957 Series - Adjusting Timing of Needle and Hook

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13) Adjusting timing of needle and hook
⑴ 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 35.
⑵ 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 37 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 36. Adjust the left and right sides ⑥
of the hook tray. (After adjustment, tighten ①, ②, ③, ④, ⑤.)
[Figure 35]
[Figure 37]
Hook edge
1mm
1.8mm
[Figure 36]
Hook edge
Needle
Touching
part
0.05~0.1mm