Adjustment
11 - 31
11
.04.27 Thread check springs (PFAFF 574)
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.
● 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.
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).
Fig. 11 - 27
61-046
5
3
2
4
6
7
8
9
10
12
1
7 mm
11
+
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