Thread Check Spring And Thread Regulator - Pfaff 481 Service Manual

17

Thread check spring and thread regulator

22 PFAFF
Requirement
1. Thread check spring 3 must have moved by its full stroke by the time the point of the
needle enters the material (stroke approx. 7 mm).
2. Thread regulator 4 must be fixed in the elongated hole so that thread check spring 3
moves by 1 mm by the time the hook has widened the thread loop to its maximum.
4
3
1
Turn thread tension 1 (screws 2) according to requirement 1.
Shift thread regulator 4 (screws 5) according to requirement 2.
Note:
The stroke of thread check spring 3 and the position of thread regulator 4 are dependent
on the type of thread and material used and should be adjusted according to the
appearance of the seam.
5
2
7 mm