20
3.7.6.4 Replacement of the top roller
When replacing the top roller, proceed as follows:
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the screw (1).
- Unscrew the screw (3) with the washer (2).
- Remove the driven top roller with the holder (4) from the
holder (5) and from the articulated shaft (6).
- Mount another top roller in inverted procedure to
dismantling.
- Set the top roller according to the par. 3.7.6.2.
3.8 Setting the presser foot lift
The maximum lift of the presser foot when lifting the foot
with knee lever or with electromagnet is to be A = 12.5 mm.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Place a cube (1) having the height of A = 12.5 ± 0.7 mm
under the presser foot.
- Screw in thoroughly downwards the screw (2).
- Tighten slightly the screw (3) in such a way that the lever
(4) turns on the shaft (5) with a certain friction moment.
- Push with the screwdriver on the lever (4), until it attains
the wall inside the arm of the sewing machine.
-
Return the lever (4) back by about 1 mm and tighten the
screw (3). With the maximum top roller lifting, the lever will
not strike into the machine arm.
- Check the axial clearance of the shaft (5) which should be
the least possible.
- Using the screw (4) set the normal pressure force of the
presser foot.
6
3
1
4
2
5
4
5 3
2
1
A
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