10
3.5 Feeding mechanism of the bootom feed
3.5.1 Description
The bottom feed is formed by two independent mechanisms
necessary for attaining an elliptical way of the feeder. The
feeding mechanism for the horizontal component of the feeder
movement is formed by the lever mechanism (1) the
mechanism of the stitch length. This is driven from the main
upper shaft through the eccentric with the connecting rod
(2). The feeding movement is then transmitted by means of
the draw bar (3)on the oscillating shaft (4) and, through the
lever (10), on the feeder carrier (9). The stitch length (the size
of the horizontal component of the feeder movement) is to be
set using the button (5) through the leverage (6) onto the
lever mechanism (1).
The feeding mechanism for the vertical component of the
feeder movement is formed by the lifting eccentric (7) on the
bottom shaft. The movement is transmitted by the connecting
rod (8) through the feeder carrier (9) and, further, through the
balance beam (11) onto the feeder.
3.5.2 Stitch length mechanism
3.5.2.1
Setting of the horizontal component
of the feeder movement
(setting of the upper feeding eccentric)
The feeding eccentric (1) must be angularly set in such a way,
so that the feeding movement for the horizontal feeding
component is delayed in phase against the needle movement.
This requirement is fulfilled when setting the 90
°
angle on the
handwheel (2), when the setting bar (3) is pushed 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 fix it with the
screw (5) which is component part of the accessory of the
machine (tighten it with care).
- Loosen the gripping joints of the levers (6) and (7).
- Turn the feeding shaft (4) in such a way, so that the recesses
(flats) point towards the bedplate (owing to the unambi-
guous setting of the eccentric by means of the setting bar).
- Insert the setting bar (3) into the hole in the eccentric (1)
and prop it from above against the feeding shaft (4).
- Shift axially the eccentric (1) on the shaft into its extreme
positions and place it in the middle.
- Tighten the screws of the eccentric (1) to the maximum
(one screw first and, after having turned slightly the hand-
wheel, the second screw as well).
- Turn the feeding shaft (4) back into the position for setting
the leverage in such a way, so that the levers (10) of the
mechanism pass in the spots of the recesses.
- Tighten the gripping joints of the levers (6) and (7).
- Test the sufficient clearance in the recesses of the feeding
shaft (4) and, using the levers (10) with the maximum stitch
length forward and rearward push against the reverse
stitching lever.
- Correct eventually the position of the feeding shaft.
- Check the position of the prop (11). In this machine provided
with a bottom feed, the prop is mounted into the pits (A and
B) as per the respective drawing.
3
4
5
1
2
6
3
11
8
7
9
10
5
2
90
o
6
10
1
4
3
7
A
B
11
C
D
