9
3.4.4 Setting the adapting spring
The mechanism of the adapting spring is to be set up in such
a way that, when uscrewing the nut (1) up to the stop to the
washer (2), the conical spring (3) remains under the tension
which is set by shifting the adjusting ring (4) locked by the
screw (1O). The angular setting thereof is to be done in such
a way that the angle A = 45
°
. The axial setting is to be done
in such a way that the plate (5) and the plate (6) are at the
mutual distance equal to the measure C= 3 mm. The washer
(7) is to be oriented in such a way that the distance B = 1 to
1.5 mm. The bushing (8) is to be oriented in such a way that
the adapting spring (9) is tensed up by 90
°
from the free state.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the nut (1) up to the stop towards the washer (2).
- Loosen the screw (10), push heavily the ring (4) against the
washer (2) and tighten the screw (10).
- Mount the mechanism of the adapting spring into the
machine in such a way, so that the pieces (5 and 6) are at
the distance C = 3 mm, set the angle A = 45
°
and tighten
the screw (11).
- Turn the washer with the nose (7) in such a way that the
distance B = 3 mm is attained.
- Put the screwdriver into the slit in the bushing (8) and turn
it in counterclockwise direction, until the spring (9) touches
slightly the nose of the washer (7). Turn then still the bushing
(8) by 1/4 revolution.
- Tighten the nut (1). In this way, the whole mechanism im-
mobilizes.
3.4.5 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 3/4 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.
Under standard sewing conditions, the thread limiter is set in
its tested positions depending on the sewing category in
accordance with the chapter 11.
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) in such a way that the screw (3)
is situated above some letter according to the chapter 11.
- Tighten the screw (3).
3.4.6 Setting the additional thread limiter
The new version of the machine is equipped with an additional
thread limiter for improving the stitch uniformity. To set it,
proceed as follows:
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Set the stitch length to the required value.
- Sew an approximately 5 cm long seam along the edge of
sewn work, switch off the machine, and tilt away the hook
cover.
- Rotate the handwheel until the thread taken up by the hook
will be stretched across its bottom, i.e., across the full
diameter of the hook.
- Adjust the position of the additional limiter (1) so as to obtain
an almost complete stretching of the thread (2) at that
moment, as shown in the drawing.
- Sew next stitch and check the adjustment.
3
1
2
10
1
5
6
11
C
8
7
1
4
3
2
9
F
B
A
2
1