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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 2O8 ° 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 2O8 ° 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 .
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).
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