Adjustment
75
13.05.07 Thread check spring and slack thread regulator
Rule
1. The movement of the thread check spring should be finished when the needle point
punctures the material (spring deflection: approx. 7 mm).
2. The thread check spring should have moved approx. 1 mm when forming the
maximum thread loop while passing the thread around the hook.
Turn the thread tension 1 (screw 2) according to rule 1.
Adjust the slack thread regulator 3 (screws 4) according to rule 2.
It may be necessary to deviate from the specified spring deflection for reasons
relating to the sewing technology.
Adjust the slack thread regulator 3 (screw 4) by “+“ (= more thread) o “-”
(= less thread).
-
+
4
4
3
2
1
7 mm
Fig. 13 - 08
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