Thread Check Springs (Pfaff 574) - Pfaff 571 Instruction Manual

11

Thread check springs (PFAFF 574)

.04.27
Requirement
1. The movement of thread check springs 3 and 6 should be completed when the needle
points penetrate the fabric (spring stroke approx. 7 mm).
2. When the largest thread loop is formed while the thread is passed around the hook, the
thread check springs 3 and 6 should rise slightly from supports 1 and 9.
Fig. 11 - 27
● Adjust support 1 (screw 2) according to requirement 1.
● To adjust the spring tension of thread check spring 3 turn screw 4 (screw 5).
● To adjust the spring tension of thread check spring 6 turn bush 7 (screw 8).
● Adjust support 9 (screw 10) according to requirement 1. (If the adjustment range is too
low, support 9 can be screwed into another hole).
● Adjust the thread regulator 11 (screw 12) according to requirement 2.
5
+
6
9
4
For technical reasons it may be necessary to deviate from the specified spring
stroke or spring tension.
Move the thread regulator 11 (screw 12) towards "+" (= more thread) or "-" (=
less thread).
11
12
3
1
8
10
7
Adjustment
2
11 - 31