Adjustment
13.07.09 Control cam in relation to the scissor
Requirement
1. The cutting motion must begin when the needle bar is 0.6 mm after TDC.
2. There must be a clearance of 9 mm between control cams 2 and 4.
● Loosen screws 1.
● Bring the needle bar to BDC and activate the engaging lever by hand.
● Bring the needle bar to 0.6 mm after TDC ( use adjustment gauge and C-clamp ).
● Turn control cam 2 until the trip is touching the roller of the tripping lever 3.
● Taking care that control cam 2 is 9 mm from retractor cam 4, tighten one of the screws 1.
● Remove the C-clamp, make the second screw 1 accessible and tighten it.
When using elastic sewing threads it may be necessary to set the the control
cams in relation to the bobbin opener and the scissor at a „later“ point in time.
A thread tension control ( subclass 906/10 ) is available for automatic tension-
release with highly elastic sewing threads.
9 mm
4
1
2
3
Fig. 13 - 41
13 - 46
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