Maintenance And Adjustment Of Sewing; Adjusting Needle Bar; Adjusting Timing Of Needle And Hook - SunStar KM-1640BL-7 User Manual

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Maintenance and Adjustment of Sewing

•For machine maintenance and repair, consult with qualified technicians.
•For electrical maintenance and repair, consult with qualified technicians or agencies.
•When safety devices are disassembled, make sure to return them to original positions.
•Use both hands when bending the machine backwards or returning it to the original position. Using
only one hand can lead to severe hand injuries due to the weight of the machine.
•Turn off the switch and pull the plug. Pressing pedal by mistake may result in physical injuries.
Caution
- Inspection, maintenance, repair
- Exchanging expendable parts such as needle, hook, knife.
- Adjusting hook oil flow
•In case you operate the machine when the power is on, please take special precaution.

8.1) Adjusting needle bar

As in Figure 8-1, place the needle bar in the lowest
position by pulling out the needle bar adjusting hole
rubber cover① and rotating the pulley, and then
loosen the needle bar holder clamp screw② and
move the needle bar such that the needle bar' s
lowest position mark carved sign④ is aligned with
the lower side of the needle bar lower bushing③
After fixing tightly the needle bar holder clamp
screw② and place the rubber cover①.

8.2) Adjusting timing of needle and hook

As in Figure8-2, align the lower side of the needle
bushing① with the fixed hook position carved line②
marked in the needle bar. Then, loosen three hook
fixing bolts③. When the hook edge④ is aligned
with the center of needle, turn the loosened hook so
that the clearance between the needle groove inside
carved in the lateral side of the needle and the hook
edge④ becomes 0.05~0.1mm. Later, tight again the
three fixing bolts③.
①
DB×1#22
DP×17#22
0.05~0.1mm
②
③
DB×1#22
④
DP×17#22
[Fig. 8-1]
[Fig. 8-2]
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