18
Adjusting the timing of the needle and the feed dog
a. Remove the needle and take the timing belt
off.
b. Place the thread take up to the highest point by turning the pulley
and coincide the arm marked point with the marked
point
on the pulley ring by turning the pulley ring .
c. In this state, turn the timing(lower) pulley
to adjust the red baseline on the bed to the red baseline of the timing(lower)
pulley. Then, put the timing belt
.
d. Check after the adjustment if the end of needle descends and coincides with the upper side
of needle plate when the upper
side
of feed dog is ascending and coincided with the upper side of needle plate.
[Figure 25]
Highest point of
thread take up
13) Adjusting timing of needle and hook
KM-380BL
a. Place the stitch to “0” and turn the pulley to place the needle
bar to its lowest point. Later, like in Figure 26, ascend the
needle by 2.4mm so that the gap between the upper side of
thread hole of the needle and the hook point is adjusted to
2mm by loosening two fixing screws
.
After adjusting the needle and the hook point to be around
0.05~0.1mm by moving the hook
from side to side, fasten
tightly two fixing screws
.
[Figure 26]
0.05mm~0.1mm
2.4mm
2mm
Hook point
Thread hole
KM-390BL
a. Place the stitch to “0” and turn the pulley to place the needle
bar to its lowest point. Later, like in Figure 27, ascend the
needle by 2.3mm so that the gap between the upper side of
thread hole of the needle and the hook point
is adjusted to
2mm by loosening three fixing screws
.
b. Loosen the two fixing screws
and adjust it from side to
side so that the clearance between the needle and the hook
point
to be about 0.05~0.1mm.
c. After the adjustment, make the gearing between the hook
shaft gear
and the lower shaft gear to maintain proper
clearance, and fasten tightly the three fixing screws
.
[Figure 27]
Hook point
Needle
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