Class 275: Differential Foot Overfeed; Adjusting The Overfeed-Foot Travel - Duerkopp Adler 271 Service Manual

12. Class 275: differential foot overfeed

12.1 Adjusting the overfeed-foot travel

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Sewing machines of class 275 enable an extra layer of material to be
processed.
Regulation and inspection
If the sewing machine is in position B and a stitch length of 4 mm is
set, the overfeed foot must not move when the overfeed guide is
swivelled.
If the sewing machine is in position B the advance lever 1 should be
vertical.
Caution: danger of injury
Turn off the main switch.
The feed may only be adjusted with the sewing machine switched off.
Adjusting the feed
1. Adjusting the thrust cam
–
Set stitch length to 4 mm.
–
Remove bobbin-winder cover.
–
Lock sewing machine in position B.
–
Undo 2 screws of thrust cam 4.
–
Rotate the thrust cam on the arm shaft.
–
Retighten 2 screws of thrust cam 4.
2. Adjusting the advance lever
–
Set the stitch length to 4 mm.
–
Remove bobbin-winder cover.
–
Lock sewing machine in position B.
–
Undo 2 screws 3 of the locking hub 2.
–
Move the advance lever 1 to the vertical.
–
Retighten 2 screws 3 of the locking hub 2.
2 3 4