Pfaff 1571 - Machine Installation and Commissioning; General Installation Procedures

Adjustment
27
15.04.17a Thread check spring (on the PFAFF 1574)
Requirement
1. The movement of the thread check spring 3 should be fi nished when the needle
points puncture the material (spring defl ection approx. 7 mm).
2. The thread check spring 3 should lift slightly off the support 1 when forming the
maximum thread loops while passing the thread around the hook.
 Adjust the support 1 (screw 2) according to requirement 1.
 Turn the sleeve 4 (screw 2) to set the spring tension of the thread check spring 3.
 Adjust the slack thread regulator 5 (screw 6) according to requirement 2.
It may be necessary to deviate from the specifi ed spring defl ection or spring
tension for reasons relating to the sewing technology. Adjust the slack thread
regulator 5 (screw 6) by "+" (= more thread) or "-" (= less thread).
Fig. 15 - 17a
5
6
3
2
4
1