Duerkopp Adler 171 Manuale di istruzioni per l'uso - Pagina 10
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3. Operating
3.1 Threading the needle
thread
Turn off main switch.
-Danger of injury! -
For threading the needle thread proceed
as shown in the figures opposite.
3.2 Threading the looper
thread
Turn off main switch.
-Danger of injury! -
For threading the looper thread also
proceed as shown in the figures
opposite. To do this, lift the thread down-
holder 3 out of its locked position.
3.3 Setting the thread
tensions
The needle thread tension must be
tighter than that of the looper thread.
The looper thread tension 2 is, therefore,
equipped with a spring made of thinner
wire.
Too tight thread tensions cause com-
pression of the material. A too loose
thread tension may lead to skipped
stitches.
For a larger amount of looper thread
pulled into the seam see section 3.5.
12
3.4 Needle thread amount for
secure stitch formation
In the case of elastic sewing threads, eg
synthetic spun threads or monofilament
threads, a certain amount of needle
thread must be pulled to assure a secure
stitch formation.
This takes place when the take-up lever
is in its bottom position in conjunction
with the height adjustment of the thread
regulator 1.
With the take-up lever in bottom position
adjust the thread regulator as follows:
In the case of elastic needle threads the
thread eyelet in the take-up lever should
be visible below the thread regulator.
Pass the needle thread on the left of the
bracket. See fig. a.
With unelastic threads, such as eg cot-
ton, the thread eyelet should be visible
above the thread regulator. Pass the
thread on the right of the bracket. See fig.
b.
1
a
Abb. / Fig.
3
b