Textiles: weaving – Warp manipulation – Shedding
Patent
1994-06-06
1995-10-31
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
66218, D03C 320, D03C 1300, D04B 2732
Patent
active
054620970
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention deals with a control device for a yarn or thread of a textile machine having a traction member connected to the yarn, with the traction member being connectable by a coupling assembly with a lifting device, and with the coupling assembly being controlled by a piezoelectric switching member. Such a control device is for instance suited for controlling a single yarn or thread, however also for a Jacquard- or dobby loom of a weaving- or knitting machine.
2. Description of the Prior Art
Numerous control devices for the thread of a textile machine are known, thus the DE-OS 21 30 502 describes for instance a control arrangement of the above-named type in a Jacquard machine for textile machines. The Jacquard machine contains a plurality of traction members as well as a lifting device for raising or lowering traction members selected according to the pattern. A coupling arrangement serves for selecting the traction members in accordance with the pattern. A piezoelectric switching member controls the coupling assembly. However herein it is disadvantageous, that the build-up of the device is extraordinarily complicated and that the piezoelectric switching member serves only as a substitute organ, which controls the drive means which themselves cause the coupling or uncoupling to happen. Herein it is additionally impossible to monitor the operational state of the coupling arrangement.
SUMMARY OF THE INVENTION
It is the object of the invention to design a control device of the type described above in such a way that the mentioned disadvantages are eliminated.
The object of the invention is achieved by providing a control device of the previously mentioned type the coupling assembly of which comprises a coupling link pin reciprocating between neutral and engaged positions, with two piezoelectric switching members being associated with the link pin and acting alternately as actuators and sensors having two piezoelectric switching members serve alternately as an actuator and a sensor and by having them move the coupling link pin to and fro between a neutral position and a coupling engaged position, there results an extraordinarily simple apparatus, since the piezoelectric switching members serve directly for controlling and for driving of the link pin and do not require any additional driving means. Since the piezoelectric switching members serve alternately not only as actuator rather also as sensor, they serve at the same time for monitoring the state of the coupling. Thus a control device results which incorporates an extremely simple build-up with simultaneous simple control and the greatest degree of security or safety.
BRIEF DESCRIPTION OF THE DRAWING
Embodiment examples of the subject in the invention are described with particularity in the following with the help of the drawings. It is shown on:
FIG. 1 A control device for controlling the warp thread of a weaving machine, partially in section and in diagrammatic illustration and in front view transversely to the longitudinal direction of the warp thread or warp yarn;
FIG. 2 the control device in FIG. 1 in section along the line II--II;
FIGS. 3a to 3c the functional mode of the control device in FIG. 1 in different shift positions of the link pin in diagrammatic presentation;
FIG. 4 a control device with two traction members according to the double lift principle for controlling a warp thread of a weaving machine analogously to the apparatus in FIG. 1, in front view transversely to the longitudinal direction of the warp thread;
FIG. 5 control device with group-like disposition of traction members and assigned thereto link pins and electrical actuation, shown diagrammatically;
FIG. 6 control apparatus consisting of several modularly structured control devices viewed from the top;
FIG. 7 the control device in FIG. 6 sectioned along the line VII--VII, shown diagrammatically;
FIG. 8 mode of operation of the device in FIGS. 6 and 7 shown diagrammatically.
DETAILED DESCRIPTION OF THE PREFERRED
REFERENCES:
patent: 3828826 (1974-08-01), Hurzeler et al.
patent: 3871415 (1975-03-01), Wolfgang et al.
patent: 4830386 (1989-05-01), Snoke et al.
patent: 5027619 (1991-07-01), Saito
patent: 5042274 (1991-08-01), Maruyama et al.
Falik Andy
Textilma AG
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