Control Cam In Relation To Scissor - Pfaff 1491E1 Instruction Manual

13.

Control cam in relation to scissor

07.09
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.
Fig. 13 - 38
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.
Adjustment
1
2
9 mm
4
3
13 - 42