9
3.4.5 Setting the thread limiter
The thread limiter is to be set in such a way that, when sewing
and passing the thread through the most distant point of the
hook, the spring (2) shifts by about 1/4 to 1/2 length of its
total length. This means that the thicker will be the sewn
material and the longer will be the stitch length, the more will
be the limiter shifted in the sense of the arrow and inversely.
Under standard sewing conditions, the thread limiter is set in
its tested positions depending on the sewing category in
accordance with the chapter 11.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Tighten the screw (3).
-
Set the thread limiter (1) so as to ensure a minimum motion
of the adapting spring (2) when the thread passes around
the bottom of the hook.
- Tighten the screw (3).
3.5 Feeding mechanism of the bootom feed
and of needle 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 lower 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) onto the feeder carrier (9).
A source of the needle feed motion is also the mechanism (1).
The swinging motion is transmitted by the shaft (11) to the
connecting rod (12) and to the needle bar holder (13).
3
4
5
1
2
6
3
9
7
8
10
13
12
11
11
2
3
1
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