27
5.2 Mounting and dismantling the motor
trimming drive
A complete electric motor including holder (1), compensating
clutch (2) of the shaft (3), eccentric (4) and conneting rod (5)
is fixed on the beam (6) of the trimming mechanism using
three screws (7).
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
When dismantling, it is necessary to loosen first the screw (8)
on the coulisse (9) and to remove the pin. Furthermore, it is
necessary to loosen and to shift the feeding shaft (10) in the
direction of the respective arrow, after having disconnected
the connector (11), the supply cable and after unscrewing the
screws (7) it is possible to remove the drive of the trimming
mechanism. When mounting, the procedure is inverse.
5.3 Setting the position of the material trimming knife
Turn the adjustable eccentric (1) in the slot of the medium post
(2), using the pin
(
ø
3 mm)
inserted into the hole marked with
a ground face, upwards up to the stop.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
After having loosened the screw (4) on the sleeve (5) shift the
knife holder (6) with the knife above the needle plate (7) to the
height X = 2,5 mm (this value corresponds to the trimmed
material of maximum thickness). In this position tighten the
screw (4). At the same time mind having the trimming knife in
parallel position with the edge of the needle plate insert. After
having performed this setting, the operator alone may regulate
the height of the knife above the needle plate using the pin
ø
3
after having put it into the holes of the eccentric (1).
Set the distance of the knife towards the needle plate insert
using the screw (8) which can be turned after having loosened
the screw (9). Set the knife with the minimum clearance between
the cutting edge and the edge of the needle plate insert. Set the
movement of the knife in such a way, so that the movement of
its cutting edge is evenly distributed with regard to the centre
of the piercing hole in the needle plate insert. Mind avoiding
friction of the knife with the needle plate insert during the whole
trimming knife lifting (excessive heating up or blunting of the
knife). Shift the knife in the direction of the knife movement
after having loosened the screw (10). This position of the knife
is not equal for all technologies. With this type of setting, it is
necessary to respect the position of the cutting edge after the
repeated regrinding of the knife.
5.4 Setting the length of the trimming knife
movement with regard to the stitch length
With its basic setting, the trimming knife moves on the path of
2 mm. For sewing operations, when the stitch length exceeds
2,5 mm, it is possible to set (increase) even the size of the
movement of the trimming knife.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
The setting operation is to be done in putting the pin
ø
3
into
the free hole in the respective portion of the clutch (2). Loosen
the screws (12) on the eccentric (4) of the connecting rod (5)
and set it up according to the gauge marks. In turning upwards,
the knife lifting is increased. The movement of the trimming
knife can be set in this way from 1,5 to 3,5 mm. Secure the set-
up position of the eccentric (4) by two screws (12), remove the
pin
ø
3
and check up the required knife lifting.
1
7
2
3
5
4
9
6
8
10
11
1
2
8
10
9
6
5
4
X
7
2
4
5
12