Adjustment
13.
04.17
Thread check spring
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
.
13 - 20
_
6
5
+
7 mm
2
7
1
3
4
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
.
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).
Summary of Contents for 1421E1
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