Thread Take-Up Spring - Duerkopp Adler 271 Service Manual

4.1 Thread take-up spring

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1
2
Regulation and inspection
The thread take-up spring 1 should keep the upper thread under
tension at least until the tip of the needle has penetrated the material.
Caution: danger of injury
Turn off the main switch.
The thread take-up spring may only be adjusted with the sewing
machine switched off.
Adjusting the spring travel
–
Undo screw 4.
–
Rotate bush 3.
The spring 1 must pre-tension the upper thread at least until the tip
of the needle enters the material.
–
Retighten screw 4.
Adjusting the spring tension
–
Undo screw 5.
–
Adjust the tension value by rotating the tension bolt 2.
The tension of the thread-tension spring must be between 20 and
50 cN (1 cN = 1 g) depending on the material and thread.
–
Retighten screw 5.
3
4
5