Duerkopp Adler 744-122 Service Instructions Manual page 24

f) With switched on cutting stroke the counter
knife 17 should move so far to the front that the
middle of the catcher groove 30 lies about even
with the needle.
– Enter testing program 55 and switch on the
cutting stroke position (long stroke) with the
key to check.
– The position mentioned above results
automatically if the push rod 29 is set as
described in e).
31
b16
g) The trimmer movement speeds can be
regulated with throttle valves. They should not
be jerky. The thread trimmer must be able to
securely take up and cut the thread chain. The
trimmer movement to the left must be
appropriate to the rail transport speed.
Trimmer forward, cut (long stroke)
_ throttle valve 1
Trimmer to the left, tension thread chain =
_ throttle valve 2
Thread chain release (short stroke)
_ throttle valve 3
Trimmer to the right,slacken thread chain =
_ throttle valve 4
2
1
3 4
=
=
30
29
h) Should the guide roller 13 not be in the material
guide rail groove then the complete thread
trimmer will be pushed too far to the back.
The contact maker 31 moves over switch b16.
The malfunction message * Schiene * appears
in the display.
The sewing unit cannot be started.
– There should be a clearance of o.5 mm
between the contact maker and the switch b16.
– After lowering the roller 13 into the rail the error
message will disappear.
17
13
25