Adjustment
63
12.05.06 Needle rise, hook-to-needle clearance, needle height and bobbin case positi-
on fi nger
Requirement
With the needle at 1.8 mm after BDC,
the hook point 6 must point to the middle of the needle and be at a distance of
0.05 mm - 0.1 mm to the clearance cut of the needle, and
the top edge of the needle eye must be 0.8 mm below the hook point.
Between the projection of the bobbin case position fi nger 4 and the bottom of the re-
taining groove there should be a distance of 0.5 mm.
1.
2.
3.
Using the adjustment pin, position the needle bar at 1.8 mm after BDC.
Adjust hook 1 (screws 2) in accordance with requirement 1.
Tighten screw 1.
Move needle bar 2 (screw 3) without turning it according to requirement 2.
Align bobbin case position fi nger 4 (screw 5) according to requirement 3..
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●
●
●
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Fig. 12 - 07
50-030
1
7
0,05 - 0,10 mm
50-031
0,5 mm
5
0,8 mm
4
3
6
5
2
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