35
1
.04.26 Thread check springs (PFAFF 574)
Fig. 1- 26
5
+
6
3
2
4
1
Requirement
1. The movement of thread check spring 3 should be completed when the needle point
penetrates 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 spring 3 should rise slightly from its support 1.
Adjust support 1 (screw 2) according to requirement 1.
Adjust the thread regulator 5 (screw 6) according to requirement 2.
Turn sleeve 4 (screw 2) to adjust the tension of thread check spring 3.
For technical reasons it may be necessary to deviate from the specified spring
stroke or spring tension.
Move the thread regulator 5 (screw 6) towards "+" (= more thread) or "-" (= less
thread).
Adjustment
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