Bobbin Case Opener Stroke - Pfaff 422 Instruction Manual

Adjustment
11 Bobbi case opener stroke
.04.11
11 - 13
Requirement
1. The front edges of retaining spring 1 and retaining trip 7 must be flush.
2. With bobbin case opener 5 in its rear position, hook base 6 and retaining spring 1 must
have a clearance equal to the thread thickness.
3
4
Fig. 11 - 11
Position retaining spring 1 (screw 2) according to Requirement 1.
Re-position shafts 3 (screws 4) according to Requirement 2.
Carry out adjustment on both hooks.
1
6
7
2
3
4
5