10
3.5 Feeding mechanism of the needle feed and of
the lower feed wheel
3.5.1 Description
The feeding mechanism is formed by the leverage (1) which
is driven from the main shaft through the eccentric with
connection rod (2). The feeding motion is transmitted by the
shaft (3) on the clutch of the bottom feed (7).
The engaging and the disengaging function of the clutch (7)
is controlled from the lower shaft (8) through the eccentric
with the connecting rod (9) and through the wedge coupling
(10). The feeding movement is transmitted by the shaft (11)
through the chain transmission (12) onto the wheel feeder
(13). The stitch length is set by the knob (14) through the
leverage (15) to the feeding mechanism (1).
3.5.2 Stitch length mechanism
3.5.2.1 Setting the upper eccentric
The eccentric (1) must be set in its angular position in such a way
that the horizontal component of the needle motion is in a phase
delay from the vertical component of this movement. This
refers to the angle of 90
°
on the handwheel (2), when the
setting stick (3) is engaged into the eccentric (1) and leans
from above against the feeding shaft (4).
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Set the angle 90
°
on the handwheel (2) and lock it with the
screw (5) which is included in the accessory of the machine
(tighten it carefully).
- Insert the setting stick (3) into the hole in the eccentric (1) and
prop it against the feeding shaft (4).
- Shift axially the eccentric on the shaft up to its extreme position
to the right or to the left and place it in the medium position.
- Tighten the screws of the eccentric (6) to the utmost (one screw
first and, in turning a bit the handwheel, another screw too).
3.5.2.2 Setting the prop
In this machine with a wheel feed, the prop (1) is mounted in the
pits (A and C) as per the drawing.
3.5.2.3a
Forward and rearward stitch length
distribution (rough)
The cam (1) is to be set at the respective angle in such a way that
the stirrup (6) is oriented in such a position, so that the connecting
rods (7 and 8) are in a line with a thoroughly screwed in knob (9)
and with turning the handwheel at 0
°
. This setting can be done
only after having set the top eccentric according to the paragraph
3.5.2.1.
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Set the zero stitch /screw in the knob (9) to the bottom of the
cam (1)/.
- Set the angle 0
°
on the handwheel and lock it with the screw
(4).
- Turn the screw (3) in the respective sense in such a way that
the connecting rods (7 and 8) are in a line and tighten the
screw (2).
5
2
90
o
3
2
1
9
4
0
o
6 7 8
C
D
A
B
1
15
4
5
13
12
14
11
10
6
8
7
2
1
9
1
3
4
6
3
