Synchronized drive system for a leno selvedge

Details Synchronized drive system for a leno selvedge Synchronized drive system for a leno selvedge

1999-09-27

2001-01-30

Falik, Andy (Department: 3741)

Textiles: weaving

Warp manipulation

Traversing

C361S243000

Reexamination Certificate

active

06179012

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a drive unit for a shaft of a device forming a leno selvedge and synchronized with the frames of a mechanical loom.
2. Description of the Prior Art
The document DE 195 48 955 C1 discloses a device for forming a leno selvedge that is provided with an electromotor whose rotors are having two arms arranged like propeller blades. These arms are provided at their end with an eye through each of which a doup end is guided. The rotation of the rotor and thus the rotation of the arms are creating, together with the weft thread, the leno selvedge. In order to avoid a permanent connection of the doup ends in the area of the spools, the sense of rotation of the motor is reversible.
Devices intended to form a leno selvedge and driven by a shaft are known for example out of DE-PS 195 20 500.6. Up to now, such a device is mechanically coupled to the drive unit of a mechanical loom, a further shaft being usually flanged to the driven shaft of a mechanical loom, that means to a shaft that is coupled to the actuation of the mechanical loom and that drives the accessory units. This further shaft may for example be designed as a flexible shaft that drives the shaft of the device for forming a leno selvedge. It is necessary to have the device for forming a leno selvedge directly driven by a corresponding driven shaft of the mechanical loom because the leno selvedge device has to run in unison with the heald frames of the mechanical loom. That means that the position of the different thread guide elements of the leno selvedge device is depending on the position of the heald frames and subsequently on the angle of aperture of the shed.
Modern mechanical looms often proved to no more have a need for a driven shaft for accessory units, as for example a leno selvedge device, that could be used as actuation for such a device. And even when a mechanical loom is provided with such a driven shaft, the shaft often has such a disadvantageous position that the mechanical coupling between the driven shaft and the shaft of the leno selvedge device require complicated measures.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to provide a drive unit of the type mentioned above with the help of which a synchronization with the movement of the heald frames of a mechanical loom is made possible without any direct mechanical coupling, as for example by means of a flexible shaft.
The solution of this object is to provide a shaft that may be actuated by a first electromotor (driving motor) that is electrically coupled with an electromotor driven by the driven shaft of the mechanical loom by electric transmission wires carrying at least three phases of alternating current waveforms. Such three phase alternating current waveforms synchronize the operation of the driving motor for the leno selvedge device with the driven shaft of the mechanical loom.
The electromotor driving the shaft of the leno selvedge device is more particularly coupled with the second electromotor working like a generator and drivable by the shaft of the mechanical loom in such a way that the phase position of the second electromotor is electrically calipered as a signal with the help of which the electromotor actuating the shaft of the leno selvedge device may be actuated. The first and second electromotor are hereby designed as asynchronous motors. The stator coils of the first and second motors are connected in parallel, the power supply for the first and second motors being advantageously provided by the stator coil since the stator coil, being mounted in a stationary outer shell of the electromotor and being located outwardly of the rotor coils mounted in a rotor of the electromotor a better position to carry off an excess of heat.
The rotor coils of the second motor may be connected to the network in two phases and the rotor coils of the motor for the leno selvedge device in one phase, whereas the rotor coils of the second motor (generator) and the rotor coils of the first motor (driving motor) may be connected to one another in two phases.
In order to explain the invention with the help of an example shown in the attached drawing which shows a circuit diagram of the three phase electric transmission wire wave with the motor driving the leno selvedge device and with the second motor which is working like a generator being coupled to the driving shaft of the mechanical loom. This second motor is electrically coupled to the driving motor of the leno selvedge device.


REFERENCES:
patent: 3010051 (1961-11-01), Lindemann
patent: 5996646 (1999-12-01), Hockemeyer et al.
patent: 5996647 (1999-12-01), Krumm
patent: 6006792 (1999-12-01), Krumm et al.
patent: 6006793 (1999-12-01), Krumm et al.
patent: 4405777 (1995-08-01), None
patent: 19520500 (1996-08-01), None
patent: 19548955 (1996-09-01), None
patent: 0750061 (1996-12-01), None
patent: 9429502 (1994-12-01), None
Patent Abstracts of Japan; vol. 015, No. 227 (C-0839) , Jun. 10, 91 & JP 03 069627 A (Toyota Autom Loom Works Ltd), Mar. 26, 1991.

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