20
3.8 Bobbin winder
3.8.1 Description
The winder (bobbin winder) winds a reserve of the hook thread.
It is driven by a spring-mounted friction gear, which stops
after having filled the bobbin.
An ideal winding is attained with a sufficient pretension of the
thread obtained on the thread guide (4) and with 1 mm under
the diameter of the bobbin. The shaft is mounted in a swinging
way and the friction gear is put into engagement by means of
a pickup lever (1) and a cam. The winder is fixed on the machine
arm by two screws (3). The thread is passed through according
to the illustration, the thread is cut off after having stopped
the winding operation using the cutting device (5).
3.8.2
Setting the bobbin winder stop
The moment of interrupting the winding is determined by the
mutual position of the pickup lever (1) and the cam (5) on a
common shaft.
The cam is locked in its functional position by the screw (6).
The mutual position is to be set on a not incorporated winder
in such a way that in the moment, when the pickup lever
leaves the space of the bobbin, the pressing function of the
cam on the winders shaft is interrupted and it moves in the
sense of the arrow. A fine setting is to be done on an
incorporated condition in the machine. Using the screw (2),
the position of the friction part of the pickup lever (1) is
adapted. In opening the lever, the stopping function is
accelerated. Its inverse function delays it. A test is to be done
after having inserted the bobbin, when passing the thread
through the device and when winding at the running of the
machine.
3.8.3 Setting the friction gear
The friction gear is formed frontally by the disk (8) on the
main top shaft of the machine and by the disk (7) with a rubber
ring on the shaft of the winder.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Proceed to the setting operation with a removed rear guard.
- The winder is in its stopped position.
- Loosen two screws (9) in the disk (8) through the hole in
the arm.
- By shifting axially the disk in the sense A, B, set the disks of
the winder (7) at the distance of 0.5 mm from the rubber
ring.
- Tighten the screws (9) in the disk (8).
- Put the winder in its working position and proceed to a
winding test.
- Mount the rear guard.
1
5
1
4
3
3
6
5
2
7
8
9
A
B
