21
3.9 Bobbin winder
3.9.1 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).
3.9.2
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.
3.9.3 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.
5
1
4
3
2
7
8
9
A
B
1
6
5
2
