Radial Position Of The Control Cam To The Bobbin Opener ( Adjustment Without Adjustment Gauge ) - Pfaff 3734-2/01 Instruction Manual

Adjustment
12. Radial position of the control cam to the bobbin opener
05.07
( adjustment without adjustment gauge )
● Operate the engaging lever by hand. While doing so the roller of the tripping lever 1 must
● Bring the needle bar to 4 mm past b.d.c. ( use the adjustment gauge and C-clamp ).
● Turn control cam 3 in the sewing direction until you feel a resistance ( beginning of the
● In this position tighten the accessible screw 2.
● Lift tripping lever 1 out of the control cam 3 by hand.
● Remove the C-clamp and tighten the remaining screws 2.
12 - 28
Requirement
The retracting motion of the bobbin opener must begin when the needle bar is 4 mm after
BDC.
Fig. 12 - 24
drop into the cam track easily and without any impediment.
retracting motion ).
1
2
3