Textiles: weaving – Warp manipulation – Shedding
Patent
1998-03-19
2000-03-28
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
139455, 139 59, D03C 1300
Patent
active
060418311
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to a device for selectively controlling the oscillating transverse movement of a yarn, in particular a warp yarn of a loom with at least one sinker driven in an oscillating manner with at least one carrier for a yarn.
2. State of the Art
Devices of the above mentioned type are well known. For example, such devices are employed in the manufacture of patterned materials for selectively controlling the warp yarns of shaft machines or Jacquard machines. Each warp yarn therein is guided through the closed eye of a heddle, and is indirectly raised or lowered by means of the shafts of a shaft machine or the harness strings of a Jacquard machine. Such devices are otherwise known from U.S. Pat. No. 4,936,352, EP-B 0 421 370, EP-A 0 302 798, EP-A 0 534 523 and DE-C 40 23 512.
One disadvantage with this type of selection and movement of the individual warp yarns is the considerable electronic and mechanical expense which makes such large space demands in the shaft or Jacquard machines as to be close to or above that for a loom and, which is high in cost. The more individual threads that must be controlled, the more expensive the solution. As a further and greater disadvantage of existing technical apparatus, independent of the Jacquard or shaft technology, all warp yarns must be individually guided through the closed eye of the loom heddles. For drawing the yarns, considerable manual or mechanical expense is involved. Due to the guidance in the closed eye of the heddle, the degree of freedom in the yarn is reduced, so that the yarn is free to move only in the warp direction. This must be compensated for through expensive control and operation by direct elements, such as heddles, as well as indirect elements, such as shafts, harnesses, Jacquard plates, magnets and so forth, whereby the elements temporarily perform different movements of the yarns individually in the Jacquard machine or groupwise in the shaft machines.
In U.S. Pat. No. 5,261,464 a device is described which consists of heddles with open eyes in a sinker which moves up and down. This device however has other disadvantages. The design of the openings allows no connection or disconnection of the threads during weaving, but serves solely for drawing the warp threads when the loom is at rest. Still further, only a few yarn thicknesses can be accepted by the guide element due to the design. The operation of the heddles is accompanied by a great deal of mechanical expense.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a device of the above mentioned type which is designed such that direct control of a yarn is possible, which replaces the formerly closed yarn openings in the heddles, which avoids the direct elements as in shaft or Jacquard machines, and which makes possible the selection of individual yarns, in particular warp yarns with essentially minimal space demands.
This object is accomplished in the present invention by control means operated by an actuator in order to engage a yarn with a carrier. Accordingly, the carriers pickup the yarn only if the actuator operates the control means such that the yarn is engaged by the corresponding carrier. The yarn is otherwise free. On the one hand the threading of the yarn through the device is substantially facilitated, and on the other hand the yarn can be individually picked up and controlled in the simplest manner. Accordingly the control of the yarns and, correspondingly, in the case of a loom, the possibilities for making patterns in the manufactured material are substantially improved.
The device is suitable for the widest possible applications. So for example it can be used in a weft yarn transport device to selectively grasp yarns of various colors and qualities.
The device possesses in particular further substantial advantages when used in conjunction with a loom. Through the integration of the selection mechanism into the sinkers numerous useful mechanical elements for controlling and deflecting the
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patent: 5261464 (1993-11-01), Lorenzo et al.
patent: 5400834 (1995-03-01), Lewyllie et al.
patent: 5477892 (1995-12-01), Corain et al.
De Angelis Marco
Kuoni Christian
Falik Andy
Textilma AG
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