Retraction Of Folding Table - Duerkopp Adler 743-221 Service Manual

3.2.1

Retraction of folding table

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2
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4
5
The folding table is extended by a pneumatic cylinder and retracted by
a tension spring.
Regulation and inspection
The tension in the spring must be such that with the folding table
retracted the lever lies parallel to the edge of the base plate.
The extension movement of the folding table must be rapid, but not
instantaneous.
Caution: danger of injury
Turn off the main switch.
The retraction of the folding table may only be adjusted with the
sewing machine switched off.
Adjustment work and function testing with the sewing machine running
must be carried out with the utmost care.
Adjustment
1. Adjusting the retraction of folding table
–
Push the folding table in.
–
Remove the right-hand casing and detach the tension spring 4.
–
Undo screw 2.
–
Press the pressure roller 6 onto the control cam 7, at the same
time aligning the lever 3 in parallel with the edge 1 of the base
plate and tighten screw 2.
The axial play in the shaft must not exceed 0.5 mm.
–
Re-attach the tension spring 4.
2. Adjusting the extension speed
–
Adjust the extension speed of the folding table at the throttle valve.
The movement should be rapid, but not instantaneous.
The throttle valve can be reached through hole 5.