3
3.1.4 Angular setting of the hook (timing)
The hook is to be angularly set in such a way that the hook
point (1) is opposite the needle at the moment, when the
needle shifts by 2.5 mm from its bottom dead center. This
corresponds to the 2O5
°
on the scale of the handwheel (3).
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Remove the throat plate.
- Turn the handwheel (3) to the 2O5
°
and fix it with the screw
(4) which is component part ot the accessory of the machine
(tighten it carefully).
- Loosen the screws (5) of wheel (6).
- Turn the hook into the required position.
- Set the gearing of the wheel (6) at the centre of the wheel
(7).
- Tighten to the maximum the screws (5).
3.1.5 Protection of the needle and of the hook point
The protecting sheet (1) is to be set up in such a way that the
clearance between the protecting sheet and the needle (2) is
the least possible.
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Remove the throat plate and the movable trimming knife.
- Unscrew the screw (3).
- Put the screwdriver into the hole of the screw (3) and, using
the regulating screw, set up the required clearance between
the needle (2) and the protecting sheet (1). When turning to
the right, the protecting sheet shifts out from the groowe
and inver-sely.
- Check up the protecting effect in pushing against the needle
in
the sense of the arrow (5). The hook point must not catch
the needle. If so, set up the protecting effect, correct
eventually the setting of the distance of the hook point
from the needle accord-ing to the paragraph 3.1.3.
- Screw in the screw (3).
3.1.6 Setting of the bobbin case opener
The bobbin case opener (1) is to be set in such a way that, at
the moment when the opener is in its dead centre, there would
be a clearance A between the opener (1) and the projection
(2), whereas the finger (3) bears on the projection (4), A =
0.7 mm for the sewing category 1 and 2, A = 0.3 mm for the
sewing category 3 and 4.
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Remove the slide plate.
- On the handwheel (5), set the angle of 295
°
(the hook is in
its dead centre).
- Loosen the screw (6).
- Turn the eccentric (7) in such a way that the required
clearance between the elements (1) and (2) is attained.
- Tighten duly the screw (6).
3
4
205
o
5
7
6
1
2
5
5
295
o
3
7
2
1
6
A
1
2
4
3
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