Adjustment
16
15
.06.10
Needle bar rise, hook-to-needle clearance, needle height and bobbin case
position finger
Rule
When the needle bar is positioned 1.8 mm after b.d.c.,
1. The tip of the hook
6
should be at the needle midpoint and be a distance of
0.05 mm -
0.1 mm
from the fillet of the needle and
2. The upper edge of the eye of the needle should be
0.8 mm
under the tip of the hook.
3. There should be a clearance of
0.5 mm
between the lug of the bobbin case position
finger
4
and the base of the stop groove.
O
Switch the machine on.
O
Set the stitch length to “
0
” using the control panel and turn the handwheel until the feed
regulator motor responds.
O
Switch the machine off.
Fig. 15 - 11
0.05 - 0.1 mm
6
1
0.5 mm
4
2
3
0.8
mm
5
4