Winding Form Of The Bobbin; Winding Tightness - Duerkopp Adler 281 Service Instructions Manual

8.2 Winding form of the bobbin

4
3

8.3 Winding tightness

30
1
2
Caution: Risk of injury!
Turn the main switch off!
Check and set the bobbin winder only with the sewing machine
switched off.
Standard checking
The winding form depends on the position of the gap 3 between both
thread guide sleeves. It should be cylindrical in order to evenly fill the
bobbin to its whole width.
·
In the case a the gap is set too low.
·
In the case c the gap is set too high.
Correction
–
Loosen the knurled nut 2.
–
Shift the guide bolt 1 axially through turning it with a screw driver.
Make sure not to alter the position of the adjusting knob 4.
–
Tighten the knurled nut 2 again.
Standard checking
A minimum pretension of the bobbin thread is required in order to get a
regular winding result (accurate winding on the bobbin).
This depends on the sliding qualities and the thickness of the thread.
A too strong tightness of the winding is favourable to the formation of
ruffs.
Correction
–
Turn the adjusting knob 4 clockwise = increase the pretension
–
Turn the adjusting knob 4 counter-clockwise = decrease the
pretension