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).
- Turn the hook into the required position.
- Set up the distance of about 0,5 mm between the gear wheel
(6) and the pin (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.
- In deforming the protective sheet (1) set the required play
between the sheet and the needle (2). After having introduced
a suitable screwdriver between the protective sheet and the
hook body (3) we shall reduce the play by levering, in
applying the pressure on the protective sheet in the sense
of the arrow (4), we shall increase the play.
- 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 according to the paragraph 3.1.3.
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.
Caution ! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Remove the sheet guard of the hook post.
- 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.
- Set the height of the eccentric (7) in such a way that it is in its
highest position in retaining the minimum clearance between
the slide (8) and the fork (9).
- Tighten duly the screw (6).
1
2
3
4
205
o
5 7
6 ~ 0,5
1
A
2
3
4
6
5
295
o
7 8
6
9
1
2
4
5
3
