10
3.5.4 Setting the adapting spring
The mechanism of the adapting springs is to be set up in such a way
that, when unscrewing the nut (1) up to the stop against the washer
(2), the conical springs (3) remain under the tension which is to be set
up 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 washers (7) are to be oriented in such a way, so that the distance
B = 1 to 1.5 mm. The bushings (8) are to be oriented in such a way
that the adapting springs (9) are tensed up by 90
°
from their 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 washers with their noses (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 immobilizes.
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 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
1
5
6
11
C
9
F
B
A
10 8
7
1
4
2
7
3
3
2
1
