7
3.3 Throat plate and its post
3.3.1 Description
The throat plate (1) is universal for all categories of sewing. In
the throat plate there is mounted an exchangeable insert (2).
The machine is supplied with several types of inserts differing
in the width of their needle aperture (3), see tab. in the par.
11.2).
For ensuring a good function of the thread trimming device, the
insert can be set in various positions in the sense of arrows in
such a way that the rear edge of the hole in the throat plate (4)
prevents unthreading the thread from the sewn material when
forming the first stitches at the beginning of the seam.
3.3.2 Mounting and removing the throat plate and
its insert
When mounting the throat plate (1), the finger (2) must engage
into the recess (3). To remove the throat plate insert (4), screw
out the screw (5), take out the washer (7, loosen the screw (8)
and remove the insert (4) by oblique upward movement shown
by the arrow.
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Turn the finger (2) in the sense towards the throat plate (1).
- Mount the throat plate (1).
- Screw in the screws (6).
- Slide in the insert under the washer (9)in the oblique
rearward sense (4).
- Mount the insert (7) and screw in the screw (5).
- Tighten the screw (8).
- When removing the insert, proceed in an inverse sequence.
3.3.3 Setting the throat plate and its insert
The insert of the throat plate should be set in the machines with
the trimming device in such a way that the edge (1) is at the distance
A = 1 to 2 mm before the spot of interlacing of the threads (2).
For the stitches up to the length of 2/3 of the maximum length,
the insert is to be set in its extreme front position in the sense of
the arrow. For long stitches, it should be in its extreme rear position,
against the sense of the arrow. With the machines without the
trimming device, the insert is in its extreme rear position.
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Loosen the screws (3).
- By applying a heavy pressure of the screwdriver, shift the insert
in its required position.
- Tighten the screws (3).
3.3.4 Side setting of the throat plate post
The post of the throat plate (1) is to be side set in such a way that
the axis of the hole in the insert of the throat plate (2) is at the
distance A = 0.1 mm to the right from the axis of the needle (3).
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
- Loosen the screws (4 and 5) (from the rear side of the post
as well).
- Shift the post (1) in the sense required for attaining the
distance A = 0.1 mm.
- Tighten the screws (4 and 5) and check up for the correct
setting.
3
1
2
2
4
3
1
2
A
3
6
1
3
2
4
5
6
7
4
1
5
2
A
3
