Thread Check Spring (Pfaff 571 And 591) - Pfaff 571 Instruction Manual

Adjustment
11

Thread check spring (PFAFF 571 and 591)

.04.26
● Adjust support 1 (screw 2) according to requirement 1.
● To adjust the spring tension turn screw 3 (screw 4).
● Adjust the thread regulator 5 (screw 6) according to requirement 2.
11 - 30
Requirement
1. The movement of thread check spring 7 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 7 should rise slightly from its support
Fig. 11 - 26
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).
4
6
5
+
1
7
3
_
2