3.7 Thread cutter
The control cam 4 determines the movement of the thread cutter and
the time of its action. Consequently, the time of action corresponds to
the sequence of movements of the stitch-forming elements.
The thread cutter is switched by electromagnetic means.
3.7.1 Control cam for timing the knife movement
Rule and control
When the thread cutter is in neutral position, the distance between the
outer diameter of the control cam 4 and the ball bearing 6 must range
between 0,2 and 0,3 mm.
When the machine is locket in
D
position, the ball bearing, lowered by
hand, must snap into the recess 5 of the control cam 4.
Caution: Danger of bodily injuries !
Turn off main switch.
Switch off the sewing machine before correcting the control cam.
Correction
–
Loosen the fastening screws of the magnet 1.
–
Shift the magnet 1.
The distance between the control cam 4 and the ball bearing 6
must range between
0,2 - 0,3 mm.
The roller 3 must be in contact with the tappet 2.
–
Tighten the fastening screws of the magnet 1.
–
Lock the sewing machine in D position.
–
Loosen the fastening screws of the control cam 4.
–
Turn the control cam on the lower shaft.
When the ball bearing 6 is lowered by hand, it must snap into the
recess 5 of the control cam.
Select the axial position so that the control cam 4 and the roller 6
face each other.
–
Tighten the fastening screws of the control cam 4.
1
2
3
6
4
5
54
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