Textiles: weaving – Warp manipulation – Shedding
Patent
1996-07-01
1998-08-18
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
D03C 1300, D03C 300, D03C 324
Patent
active
057946655
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a Jacquard machine which functions without the employment of harness cords, and a method of operating the Jacquard machine in accordance with the invention.
2. Discussion of the Prior Art
In a conventional Jacquard machine, hooks for raising and lowering the warp threads of a weaving machine connected with the Jacquard machine are coupled with driven knives, or released from these knives, in accordance with the weaving pattern to be woven. When the hooks are connected with the driven knives, they carry out a shed-forming lifting and lowering movement. By means of a hook selection device particular hooks can be selected, in dependence upon the pattern to be woven, which are separated from the driven knives and thus do not take part in the lifting and lowering movement. The registering of the pattern is effected by means of a plurality of harness cords which permit a connection through inter-engagement or form fitting or locking--a positive connection--between the hooks and the warp threads during the lowering movement. Respective warp threads in the register of the pattern are connected with respective hooks via harness cords. To provide the connection through force locking or action of a force--a non-positive connection--during the lowering movement, tension springs are in general provided at the end of the harness cords opposite to the hooks.
The employment of harness cords for controlling the lifting and lowering movement of the warp threads is disadvantageous since the harness cords are subject to great wear and the exchange of a torn harness cord during the operation of the weaving machine has the consequence that production must be brought to a halt for a long period of time.
In DE-PS 22 30 486, for the avoidance of this disadvantage, there is proposed a harnessless Jacquard machine. For control of each individual warp thread there is provided a pressing device for coupling a hook provided for each warp thread with two alternately moved lifting knives. The pressing device includes a selection device, which in correspondence to the pattern to be woven selects individual hooks which do not take part in the lifting and lowering of the lifting knives. The hooks are connected, at their underside, the so-called hook floor, in each case with a cord which is engaged with the warp thread to be raised or to be lowered. Since the pressing device, in cooperation with the lifting knives, is however solely capable of delivering the lifting movement of the warp threads, there are provided at the lower ends of the cords tension springs for the lowering movement of the warp threads. DE-PS 22 30 486 discloses the possibility of individual control of the warp threads of the weaving machine and the replacement of the harness cords by means of tear-resistant cords, but for the lowering movement of the warp threads tensioning springs are however still necessary. The known Jacquard machine thus represents a Jacquard machine which during the lifting movement works in a positive manner and during the lowering movement works in a non-positive manner.
From DE-AS 21 19 053 there is known a device which works harnessless, for shed formation in looms. For producing the lifting and lowering movements of the warp threads there is provided for each warp thread a wire or coil element which is connected with the warp thread concerned by means of a cord or rod. The wire or coil elements are arranged in a static magnetic field and are subjected to an electric current. In accordance with the direction of the current the wire or coil elements are deformed or deflected either upwardly or downwardly. The lifting or lowering movement produced by these means is transferred to the warp threads by means of the cords or rods. Such an arrangement is however practically realizable only with difficulty because of the necessary high levels of current and magnetic field strength.
SUMMARY OF THE INVENTION
The object of the present invention is thus to provide a Jacquard
REFERENCES:
patent: 3817292 (1974-06-01), Doehler et al.
patent: 3871415 (1975-03-01), Wolfgang et al.
patent: 5027619 (1991-07-01), Saito
patent: 5309953 (1994-05-01), Speich
Falik Andy
Grosse Webereimaschinen GmbH
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