Thread Check Spring - Pfaff 521 Instruction Manual

13

Thread check spring

.04.15
Requirements
1. The motion of the thread check spring 7 must be finished when the needle point enters
the material (spring stroke approx. 7 mm).
2. When the thread loop is at its largest when going around the hook, the thread check
spring must raise slightly from the workpiece rack 1.
Fig. 13 - 16
Move workpiece rack 1 (screw 2) in accordance with requirement 1.
Turn screw 3 (screw 4) to adjust the strength of the spring.
Move the slack thread regulator 5 (screw 6) in accordance with requirement 2.
+
1
Due to technical sewing reasons it may be necessary to deviate from the spring
stroke / spring strength mentioned here.
Move the slack thread regulator 5 (screw 6) toward the "+" (= more thread)
or toward the "-" (= less thread).
4
6
5
7
3
Adjustment
_
2
13 - 17