Thread Catcher Range Of Motion; Pressure Of The Counter Knife On The Thread Catcher; Position Of The Bobbin Thread Clamp; Position Of The Released Thread Tension Assembly - Duerkopp Adler N291 Service Manual

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3.7 Thread catcher range of
motion
Rule:
When the thread catcher 6 has been swung
into its home position, its point should be
located below the counter knife and be at a
distance of 1 mm to the cutting edge of the
counter knife 2.
Correction:
Loosen the screw 8 and change the position of
the thread catcher accordingly.
3.8 Pressure of the counter knife on
the thread catcher
Rule:
The knives should trim securely with minimum
pressure.
Basic adjustment:
– Bring the handwheel to position B.
– Turn back the pressure screw 1.
– Swing the thread catcher 6 under the counter
knife 2.
– Turn in the pressure screw 1 accordingly,
loosen the screw 4 at the carrier, and then use
the screw 5 to change the position of the carrier
such that the counter knife is parallel to the
thread catcher.
– Make a trimming test by moving the thread
catcher by hand.
Correction:
Turn the pressure screw 1 accordingly and
position the counter knife parallel to the thread
catcher using the screw 5.
Please note:
The lower the knife pressure, the less the wear
of the blades.
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3.9 Position of the bobbin thread clamp

Explanation:
During the trimming action the clamp 3 is to
clamp the bobbin thread so that the needle
thread securely carries the bobbin thread with
it during the first stitches.
Rule:
The side of the clamp 3 should rest against the
carrier.
3.10 Position of the released thread
tension
Rule:
The thread tension should be opened just
enough so that threads of the size 11/3 pull
easily through the tension discs.
Check:
Press the lever 9 in the arrow-indicated
direction as far as possible.
Correction:
Change the position of the stopper 10
accordingly.

3.11 Pressure of the thread pre-tension

Explanation:
During thread trimming the main thread tension
is opened so that just the thread pre-tension is
effective.
Rule:
The thread end hanging out of the needle after
thread trimming should be sufficiently long so
that it can be pulled up to the front throat plate
screw.
The required adjustment depends on the size
and texture of the thread.
Correction:
Turn the button of the thread pre-tension at the
face plate accordingly.