Raising Stroke Of The Puller; Puller Pressure; Fabric Keep-Off Plate; Timing Belt Tension - Duerkopp Adler 171 Service Manual

3.3 Raising stroke of the puller

Upper end position
The raised puller must not strike the sewing foot.
Turn the bolt 8 such that its slot is vertical.
Limit the stroke of the piston in the cylinder 9
accordingly using the self-locking set screw 7.
To do this, use a 2.5-mm-Allen key.
Lower end position
After the vulcollan puller has lowered onto the
throat plate, the rocker 6 must still be able to
oscillate 2 mm, before the stopper of the hand lever
5 reaches its end position. The material is thus
slightly tensioned by the touching down puller.
Loosen the lock nut 10 and turn the threaded pin 11
accordingly.
Attention!
Steel pullers must not rest on the throat plate. The
distance between the puller and plate should be
approx. 0.2 mm.

3.4 Puller pressure

The puller pressure can be modified by adjusting
the lever arm for the cylinder force and can thus be
adjusted to the respective material.
Loosen the screw 13. Cylinder in
arrow-indicated direction A = higher pressure
arrow-indicated direction B = lower pressure

3.5 Fabric keep-off plate

The distance between the puller and the fabric
keep-off plate 12 should be as small as possible.
To prevent the material from getting caught in this
gap, the distance needs to be corrected depending
on the abrasion of the puller.
On machines without thread trimmer the fabric
keep-off plate at the same time serves as trimming
knife for the thread chain.

3.6 Timing belt tension

The timing belts should be tensioned so as to
assure the accurate transmission of the step
lengths of the puller.
A too great belt tension may result in excessive
wear and tear and malfunctioning.
5
4
7
8
9
10
11
12
13
A
B
23