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Adjustment
12.
Radial position of the control cam to the bobbin opener
05.07
( adjustment without adjustment gauge )
12 - 26
Requirement
The retracting motion of the bobbin opener must begin when the needle bar is 4 mm after
BDC.
Fig. 12 - 24
Operate the engaging lever by hand. While doing so the roller of the tripping lever 1 must
drop into the cam track easily and without any impediment.
Bring the needle bar to 4 mm past b.d.c. ( use the adjustment gauge and C-clamp ).
Turn control cam 3 in the sewing direction until you feel a resistance ( beginning of the
retracting motion ).
In this position tighten the accessible screw 2.
Lift tripping lever 1 out of the control cam 3 by hand.
Remove the C-clamp and tighten the remaining screws 2.
1
2
3
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