Adjustment
13 - 42
13.
07.09
Control cam in relation to scissor
Requirements
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 can be necessary to set the relationship
between the control cam and the bobbin opener and the scissors a little „later“.
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 - 38
