Duerkopp Adler 171 Руководство по эксплуатации - Страница 12
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3.5 Adjusting the looper thread take-up
The looper thread take-up 1 automatically
adjusts the looper thread amount to the
set stitch length.
This means: Always optimum stitch forma-
tion and stitch tightening with every stitch
length, and also with condensed stitches.
No seam grinning and seam puckering.
The pulled amount of looper thread can
be changed by adjusting the looper
a)
b)
c)
14
thread take-up cam.
Without change of the thread tensions
a) tight, b) regular, c) highly elastic
seams (balloon stitch) are yielded.
After loosening the screws 2 and
adjusting the looper thread take-up 1,
regulate as follows:
In direction 0 = tighter seam
In direction 5 = more elastic seam
Important information!
1)
In the case of an extreme setting, eg
a stitch length that is as short as
possible and a maximum amount of
thread (elastic seam), be sure that
the needle does enter the thread
triangle safely.
Excessive looper thread may result
in skipped stitches.
2)
If the stitch length is substantially in-
creased with the adjustment values
1
described under 1), eg to 4 mm, the
thread guide must be set back
toward 0. Otherwise, the looper
thread might drop off the looper
thread take-up cam.
During the backward motion of the
looper, the looper thread would not
be pulled back by the looper thread
take-up cam, as is required.
3)
If the stitch length is changed on the
171-131110 which has no coulisse
shaft, the take-up lever must be
readjusted manually.
2