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22. Setting of the movable cutting knife lifting (Fig. 22)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
After having engaged the pin (3) into the cam (2), turn the hand wheel towards ourselves, until the bottom thread and one branch
of the loop enter into the cutout on the side of the cutting knife. When this does not occur, loosen the nut (7) on the tilting lever
(8) and shift the draw bar (9) in the groove of the lever (8). To increase the movement, the lever arm is to be lenghtened. Secure
the position in tightening up the nut (7).
23. Setting of the upper thread tensioner releasing (Fig. 22)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
The cutting mechanism needs that, within its course, the upper thread is released i.e. that the main thread tensioner is to be
released. It is automatically released within the necessary cutting cycle through the cable (13) and the lever system when starting
the cutting operation. If there no release thereof occurs, it is necessary to set the tension of the cable (13). This is done when
loosening the screw (11) on the lever (12) or in turning slightly the whole lever (12) after having loosened the screw (10).
24. Setting of the adjusting spring function (Fig. 23)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
After having loosened the screw (1) remove the complete upper thread
tensioner from the machine arm. The size of the elasticity of the adjusting
spring (2) is to be set after having loosened the screw (3) on the sleeve (4)
in turning slightly the pin (5) using a screwdriver. In turning the pin to the
left, the size of the spring elasticity is being reduced, in turning it to the
right, it is increased. In the same way, the lesser or the greater swing of the
spring arm is to be set. The correct setting of the adjusting spring is to be
checked after having sewn some stitches. Tilt the machine head and check
the correct passing of the thread over the hook. The thread passing over
the biggest hook diameter should slightly move the adjusting spring
without tensioning it.
25. Setting of the starting position of the movable
thread cutter (Fig. 24, 25)
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
The cutting knife (1) should be set in its starting position in such
a way, so that there is between the outer knife edge and the outer
edge of the plate (2) the distance of 0,5 - 1 mm (the outer edge of
the plate (2) is idential with the outer edge of the bedplate). The
plate must be fastened with two screws (3) to the bedplate of the
machine in such position, that there is no gap between this plate
and the throat plate. The position of the cutting knife is to be set
after loosening the lock nuts (5) in turning the connecting draw
bar (6). In turning the driving draw bar, its necessary length is to
be set for securing the correct position of the thread wiper, then
tighten anew the lock nuts (5).
26. Setting of the stationary knife pressure (Fig. 25)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation,
wait until the motor stops!
For ensuring the correct function of the thread cutting, it is necessary to
regulate the pressure of the stationary cutting knife. In screwing the screw
(4) in the plate (2), the pressure is increased, in screwing it out, it is reduced.
Be careful in having this pressure the least possible when the knife still cuts
the thread in a reliable way. In the opposite case there occurs an excessive
wear of the stationary and of the movable knife (and that of the thread
wiper). When even after having set up no reliable trimming occurs, it is
necessary to check up the state of the cutting edge of the stationary knife,
to restore this cutting edge or to replace the knife.
2
1
0,5 - 1
3
2
9
1
3
4
2
5
S
5
6
5
4
Fig. 23
Fig. 24
Fig. 25
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