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 i
n 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.
