Adjustment
13 - 40
13.07.07 Radial position of the control cam in relation to the bobbin opener
Requirement
The retracting motion of the bobbin opener must begin when the needle bar is 4 mm after
BDC.
1
2
3
Fig. 13 - 36
● Activate the tripping lever by hand. The roller of the tripping lever 1 must engage easily
and unobstructedly in the cam track.
● Bring the needle bar to 4 mm after BDC ( use adjustment gauge and C-clamp ).
● Loosen screws 2.
● Turn control cam 3 in the direction of rotation until you feel resistance ( start of the
retracting motion ).
● In this position tighten the accessible screw 2.
● Remove tripping lever 1 out of the control cam 3 by hand.
● Remove the C-clamp and tighten the remaining screws 2.
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