Pfaff 3511-2/01 - Thread Check Spring and Slack Regulator

Adjustment
64
Fig. 12 - 08
50-063
7 mm
4
3
2
1
4
+
-
12.05.07 Thread check spring and slack thread regulator
Requirement
The motion of the thread check spring must be completed when the needle point en-
ters the material (spring stroke approx. 7 mm).
When the thread loop is at its largest when going around the hook, the thread check
spring must have moved by approx. 1 mm.
1.
2.
Turn thread tension 1 (screw 2) according to requirement 1.
Turn thread tension 3 (screw 4) according to requirement 2.
Due to technical sewing reasons it may be necessary to deviate from the
spring stroke indicated above.
Move the slack thread regulator 3 (screw 4) toward the "+" (= more thread) or
toward the "-" (= less thread)
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