11 - 4
Adjustment
11.
04.03
Hook-to-needle clearance, needle rise, needle height and needle guard
Requirement
When the needle bar is positioned at 1.8 mm after b.d.c.
1. The point of the hook must be pointing to the centre of the needle and have a side
clearance of
0.05 – 0.1 mm
to the needle.
2. The top edge of the needle eye must be
0.8 – 1.00 mm
below the hook point and
3. The needle guard
5
must lightly touch the needle.
●
Loosen screws
1
and
2
.
●
Bring the needle to its b.d.c. and slide the 1.8 mm thick feeler gauge under the needle
bar bearing.
●
Place the screw clamp on the feeler gauge and tighten it.
●
Remove feeler gauge and turn the balance wheel in the sewing direction until the screw
clamp is resting on the needle bar bearing.
●
Adjust the hook bearing
3
according to
requirement 1
.
3
2
1
4
1
Fig. 11 - 03
0.05 - 0.1 mm
0.8 - 1 mm
5
