18
3.7.5 Replacement the indented belt
Before replacing the indented belt, the bottom feeding shaft is to be
removed. The procedure is as follows:
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Loosen the screw (1) of the tensioning roller (2) and loosen it.
- Loosen the screws (3) of the pulley (4) and shift it to the left in such
a way that the screws (5 and 6) of the feeding clutch (7) are accessible.
- Loosen the screws (5 and 6).
- Loosen the screw (8) of the axial ring (9).
- Loosen the screws (10) of the chain wheel (11).
- Push the shaft (12) to the left in such a way that it is out of the pulley
(4).
- Remove the pulley (4).
- Remove the front guard.
- Loosen and unscrew the screw (4) of the holder of the wheel (15)
and remove it from the holder (24).
- Loosen the screws (16 and 17) of the holder (18).
- Remove the holder (18) together with the holder (15) and articulated
shaft (13) from the machine.
- Loosen the screws (19) of the pulley (20).
- Remove the retaining ring (21) from the shaft (22).
- Hold the pulley (20) and pull out the feeding shaft (22) from the arm
in such a way that it is possible to remove the indented belt (23)
from the arm of the machine.
- Replace the belt with a new one and proceed to the assembly (inverted
procedure of dismantling).
- Proceed to the setting operation according to the par. 3.7.2, 3.7.3
and 3.7.4.
3.7.6 Setting the feeding difference
The size of feeding by the driven top roller is regulated by means
of a regulating screw. The top roller feeding is to be set in cases, when
a difference between the size of the top and bottom feeding of the sewn
material is evident. This will show up in upward or downward bending
of the sewn parts. It is therefore necessary, when bending the sewn
parts:
1. upwards - to increase the feeding performance of the top roller.
2. downwards - to reduce the feeding performance of the top roller.
This setting operation is done as follows:
- Loosen the locking nut (1) of the adjusting screw (2).
- Turn the screw to the left (in increasing so the feeding perfor-mance
of the top roller) or to the right (in reducing so the feeding performance
of the top roller).
- Test the result of this setting in sewing.
- Tighten the locking nut (1).
- The standard setting for the zero difference is 3 mm (see Fig.)
- the gap between the front faces of the screw (2) and the nut (1).
11
10
12
4
3
8
9
1
2
5 6
7
24
15
14
21
22
23
20
19
13
17
18
16
2
1
3
