21
4.7 Setting the retaining spring of the hook thread
The retaining spring (1) holds the hook thread after having
performed the trimming. It is to be set in such a way that the
force necessary for pulling out the thread from the retaining
spring (1) is approximately equal to the force necessary for
pulling out the thread from the hook.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Shape the retaining spring (1) in such a way that it fits close
with all its surface (without wedge) onto the moving trim-
ming knife (4).
- Shape the retaining spring in such a way that with mode-
rately tightened screws (2) it comes to lean against the
moving trimmer knife with a pre-load corresponding to the
force required to draw the thread out of the spring.
The pulling force is tested using a screwdriver according to
the illustration.
Caution!
The setting of the retaining spring (1) depends on
the setting of the hook thread tension and differs
then according to the respective sewing category.
4.8 Setting the switching of electromagnets
The electromagnets of the trimming device and loosening of
the tensioner must work in accordance with the diagram. This
is ensured by setting the stopmotor (see the instructions for
use of the stopmotor).
1- 1. position of the needle (135
°
on the handwheel)
2- 2. position of the needle (64
°
on the handwheel)
3- position of stopping the tensioner (10
°
÷ 25
°
on the hand-
wheel)
4- movement of the pickup roller
5- current of the trimming device electromagnet
6- current of the tensioner loosening electromagnet
5
.
Lifting the presser foot by electromagnet
5.1 Description
The core of the electromagnet, respectively its pin must be set
in such a way that the presser foot lifting is enabled.
5.2 Setting the electromagnet pin
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the cap of the core (1) of the electromagnet.
- Shift the core (2) with the pin (3) and unscrew the locking
screw (4).
-
Unscrew the pin (3) in the core (2) in the A direction up to
the stop.
- Push the core (2) into the magnet (5) in the B direction
up to the stop.
- In this position, set the maximum top roller lifting in the B
direction.
- Screw on and tighten the arresting screw (4).
- Screw on the cap (1).
1
4
2
4
5
6
1
3
2
2
4
1
3
5
A
B
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