Thread Check Spring (On To Pfaff 1571; 1591 And 1593) - Pfaff 1571 Adjustment Manual

Adjustment
15 Thread check spring
.04.17
 Adjust support 1 (screw 2) according to requirement 1.
 Turn the thread tension spring 3 and sleeve 4 (screw 2) to adjust the spring force.
 Adjust the thread regulator 5 (screw 6) according to requirement 2.
26
(on the PFAFF 1571; 1591 and 1593)
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.
Fig. 15 - 17
For technical reasons it may be necessary to deviate from the specifi ed
springstroke or spring tension.Move the thread regulator 5 (screw 6) towards
"+" (= more thread) or "-" (= lessthread).
6
5
3 2
4
1