Beisler 739-23-1 Service Manual - Manual (Page 14)

2.10 Thread tensioning spring
Caution! Risk of injury!
Switch off main switch!
Adjust thread tensioning spring only when the sewing machine is
switched off.
Instruction and inspection
The thread tensioning spring 1 must hold the needle thread tense until
the needle point has penetrated the sewing material.
Thread run adjustment
–
Loosen screw 4.
– Turn bushing 3.
The thread tensioning spring 1 must hold the needle thread tense
until the needle point has penetrated the sewing material.
– Tighten screw 4.
Spring tension adjustment
–
Loosen screw 5.
– Adjust tension by turning the tensioning bolt 2.
Depending on the sewing material and the thread properties, the
tension of the thread tensioning spring must be between 20 and 50
cN (1 cN = 1 g).
– Tighten screw 5.
3-14
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