2.7 Thread controller spring
Caution: Danger of injury!
Switchthemainswitchoff.
Adjust the thread controller spring only with the sewing unit s witched
off.
Standard checking
The thread controller springs must keep the needle threads under
tension until the needle points penetrate the fabric.
If the needle threads are slack when the needles penetrate the fabric it
may happen that the needles prick the threads when moving down.
–
Turn the handwheel forwards slowly and watch the thread
controller springs at the moment of the needle penetration.
Correction of the spring travel
–
Loosen screw 1.
–
Adjust the regulator 3 by turning.
–
Tighten screw 1.
Correction of the spring tension
–
Loosen screw 1.
–
Turn bush 2.
Turn in clockwise direction: Increase the spring tension
Turn counter-clockwise: Reduce the spring tension
–
Tighten screw 1.
39
2
3
1
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