16
3.6.4.2 Wheel feeder and its post
3.6.4.2.1 Setting the chain wheel
The bottom chain wheel (2) must be set in such a way that the
chain does not catch the rib (4).
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Loosen both screws (1).
- Turn the chain wheel (2) until the chain clutch appears.
- Set the distance A= 1 mm between the chain clutch and the
rib (4).
- Tighten firmly the screws (1).
3.6.4.2.2 Height setting of the feeder and tension-
ing of the chain
The wheel feeder (1) is to be set in such a way that the points
of its teeth overtop the throat plate by X= 0.3 to 0.7 mm.
When sewing soft and thick materials, it is necessary to
increase the value X, until a good quality of feeding is
attained, but only to the measure of not deteriorating the
beginning of sewing after the carried out thread trimming.
With every correction of the teeth height, the tension of the
chain (2) is to be corrected.
Caution! Dangere of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Loosen the screw (3).
- Loosen the screw (4).
- Loosen or tighten the screw (5) and push simultaneously with
finger the feeder (1) downwards, until the required height of
the teeth X of the wheel feeder is attained.
- Tighten then still the screw (5) by 45
°
(1/8 revolution).
- Tension the tensioner (6) up to the stop. Be careful in side
shifting it to the centre of the chain. Tighten the screw (3).
- Loosen the screw (5) by 45
°
(1/8 revolution), into its original
position. In this way, the optimal clearance of the chain
transmission is attained.
- Tighten the screw (4).
- Correct the set height of the top roller according to the
par. 3.6.5.
3
6
2
X
4
5
1
1
A = 1 mm
1
3
2
4
