Dürkopp Adler 52 i Series Service Instructions Manual page 30

4. Set the tooth clearance as small as possible on the entire circumference
5. Tighten 4 screws (4) on the conical worm (1).
6. Move the regulating ring (2) on touch with the conical worm (1).
7. Tighten 2 screws (3).
8. Check the toot clearance.
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of the conical worm (1).
• Shift the conical worm (1) to the thread lever mechanism:
Reduce the tooth clearance
• Conical worm (1) shifting to the hand wheel:
Increase the tooth clearance
Form stitch mechanism of machine 525
Service Instructions 52Xi, 52Xi-75 - 00.0 - 11/2021