Setting The Adapting Spring; Setting The Thread Limiter - Duerkopp Adler 1280i-6 Instructions For Service Manual

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- In the rest state of the machine (with not relieved tensioner
discs) set the lever (3) in turning it slightly on the shaft (4)
to a position in which the roller (5) of the lever (3) is in
contact with the slanting surface (6) of the lever (7) and is
about 0.1 mm distant from the flat surface (8) of the lever.
- At the maximum lift of the top roller, the roller (5) moves on
the flat surface (9) of the lever (7); in this condition, there
must be a minimal play at the tensioner plate lift (when
pushing qat the spot “A” (3.5.1), the plate must still have a
minimum lifting - between the roller (5) and the surface (9)
there is a minimum clearance). Retighten the screws (1) and
(2), check the play, and correct it in case of need.

3.5.4 Setting the adapting spring

The mechanism of the adapting spring is in the machine arm
set by the pin (1) and fixed by the screw (2). The axial
adjustment shall ensure that the surfaces of the parts (3) and
(4) are aligned (the threaded thread must in no place break on
edges). The initial position of the adapting spring (5) shall
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ensure that “B” = 1 to 1.5 mm (see the Figure).
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
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- Loosen the screw (2) and take the mechanism out of the
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machine arm.
- Turning the body (6) relative to the pin (1), set the required
initial position of the adapting spring /the screw (7) has
9 been set at the producer´s so as to permit the turning
movement of the body (6) the screw must not be fully
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tightened/.
- During the installation of the mechanism into the machine
arm take care of the axial adjustment of the mechanism.
- Retighten the screw (2) and check the adjustment.
- Loosen the nut (8) of the mechanism, insert a screwdriver
into the notch of the screw (9) and set the required value of
the adapting spring. By turning the screw clockwise you
increase the spring force, and vice versa.
- Retighten the nut (8) and check the function of the adapting
spring.

3.5.5 Setting the thread limiter

The thread limiter is to be set in such a way that, when sewing
and passing the thread through the most distant point of the
hook, the spring (2) shifts by about 1/4 to 1/2 length of its
total length. This means that the thicker will be the sewn
material and the longer will be the stitch length, the more will
be the limiter shifted in the sense of the arrow and inversely.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Tighten the screw (3).
- Set the thread limiter (1) so as to ensure a minimum motion
of the adapting spring (2) when the thread passes around
the bottom of the hook.
- Tighten the screw (3).
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