Random lay wire twisting machine

Details Random lay wire twisting machine Random lay wire twisting machine

1998-11-13

2001-11-20

Stryjewski, William (Department: 3765)

Textiles: spinning, twisting, and twining

Apparatus and processes

Unitary multiple twist devices

C057S092000, C057S058490, C057S058520, C057S058670, C057S058650, C057S206000, C057S237000, C057S264000

Reexamination Certificate

active

06318062

ABSTRACT:

BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a wire twisting machine, wire construction and method which provides a randomly varying lay of a twisted pair of wires over a given length or time. This improves the electrical characteristics of the final cable construction.
The problem of interference of random noise between insulated wires in runs of communication wires and cables has always been a problem. As the need for more and more cabling has increased, it is necessary to run more and more wires within given conduits or in bundles formed for purposes of transporting data and information. This has become even more important in recent years as the frequencies used in connection with wires for telecommunications and computer applications have increased and therefore the chances of leakage or contamination of information passing between adjacent wires has become ever greater.
In order to minimize problems resulting from the closeness of the wires and to facilitate the handling of long lengths of wires, the wires are generally twisted in pairs or numbers greater than two to form cables. However, it is important that the wires not be in a close parallel relationship for any substantial length in order to minimize the possibility of contamination or noise from one wire effecting another wire.
Therefore, efforts are made in the manufacturing of wire to insure that different lays of wire are placed alongside each other for pairs of wires so that there can be no intertwining between groups of twisted wires which would exacerbate any cross contamination problems. Various different attempts have been made to accomplish this purpose. For example, when forming cables of various numbers of pairs, care is taken to insure that the lay length of each pair of wires is different to reduce the effects of proximity between the various pairs. Similarly, efforts in the past have attempted to vary the length of the lay along the path of the wire, but this has generally not proved to be easy to accomplish.
Various different machines have been provided for winding wires, but none of these machines have been able to produce a randomly varying length of lay or twist pitch in the wire.
DESCRIPTION OF THE PRIOR ART
A variety of apparatus for twisting strands of fiber and wire have been utilized in the past and are presently employed. Examples of such known devices are shown in the following prior patents and publications.
U.S. Pat. No. 1,684,511 to O'Donnell discloses a strand-twisting apparatus for cotton, consisting of a pair of flyer bows and twisting member which coact to form two complete twists in the cotton core and the tinsel served threads for each revolution of the flyer.
U.S. Pat. No. 2,002,975 to Brooks discloses twisted strands and a method of producing same consisting of a twisting frame and a plurality of reels to produce a strand consisting of a flat and at least one round wire twisted together.
U.S. Pat. No. 2,010,888 to Pool discloses a method for doubling yarns, threads, or filaments utilizing a pair of flyer tubes wherein one of the threads is provided with an added twist during the drawing operation, and the other of the threads has not been twisted during the operation and is doubled with the thread drawn with the twist. The degree of doubling is dependent upon the rate of take-up which is adjustable relative to the rate of twisting. This variation is selectable from a low to a high degree.
U.S. Pat. No. 2,734,525 to Blaisdell discloses a wire twisting machine consisting of a flyer section with a rotatable tubular shaft at one end thereof and within which a wire strand passes relative to the flyer section to be guided along a shaft in which a plurality of rotatable rollers thereon engage the strand as it passes through the guide for alignment of the wires prior to twisting.
U.S. Pat. No. 2,773,344 to Van Hook discloses a vertical twisting machine consisting of three flyer arms and a capstan unit pivoted at its upper end proximate to a cradle for the flyer bows, whereby the capstan may be swung about the pivotal axis for changing the gears of the apparatus to vary the lay of the product.
U.S. Pat. No. 3,142,952 to Krafft et al discloses a stranding apparatus consisting of an endless belt mounted on the flyer for the cable and revolving therewith, in combination with means for driving the belt at approximately the same speed as the speed of the advancement strand. The belt prevents excess tension on the strand during the winding operation.
U.S. Pat. No. 3,147,580 to Blaisdell et al discloses controlling means for a double twist wire machine consisting of first and second responsive means connected to the flyer for the apparatus to feed a precise length of wire required to make each layer of concentric double twist strand, and to also act as a means for controlling the speed of the take-up reel to produce a uniform twist.
U.S. Pat. No. RE 26,757 to Vibber discloses an apparatus for twisting and plying strands consisting of a mechanism for controlling the rotating loop or balloon of a twisting mechanism. Means responsive to variations in tension of the second strand are provided for varying the speed of rotation of a shaft for the strand for twisting together evenly two strands of two-ply cord.
U.S. Pat. No. 4,133,167 to Schofield discloses a cable making machine consisting of separate machine sections for lapping and twisting so that the machine can be used selectively therefor, or for both twisting and lapping. Common drive means are used for the machine including a conventional clutch for isolating the drive to the lapping section when required.
U.S. Pat. No. 4,222,221 to Lenorak discloses a winding machine with a multitwist spindle for textile working of fibers and yarn consisting of a multitwist spindle rotatably mounted on the supporting frame and a winding-on means synchronized with respect to each other.
U.S. Pat. No. 4,300,339 to Orlandi et al discloses a system for stranding and cabling elongate filaments. A plurality of modules is adapted for end-to-end alignment, each of the modules supporting supply reels which elongate filaments that are drawn off and guided to a rotating flyer guide to cause the stranding of the filaments to the next successive module.
U.S. Pat. No. 4,328,662 to Bretegnier et al discloses a multiple twisting machine for high speed helical winding of unitary strands to form a cable. The machine consists of central and external frames and drive means therefor, for reversing rotation and driving the frames in opposite directions at substantially the same speed. One of the frames is driven by pulleys at its ends and includes plates connected by a stretch-taut rope which guides the cable over a path to be twisted.
U.S. Pat. No. 4,446,688 to Ueda discloses a double twisting machine consisting of two motors for directly and separately driving each end of a flyer which thereby eliminates the need for a drive shaft, driving pulleys and timing belts for the apparatus.
U.S. Pat. No. 4,545,190 to Rye et al discloses a metallic cable, method and apparatus for making same, wherein the cable consists of strands of identical shaped filaments positioned beside and against each other such that each filament of the strand is in line and in contact with at least one filament of the strand. A series of “kill rolls”, freely rotating pulleys, mechanically deform the filaments of a strand or cable to permanently fix the position of the filaments with respect to one another and relieve the stresses in the strand or the cable. The helixes of the filaments of the strand are sloped in a first direction and a single filament twisted with said strand in a direction opposite thereto.
U.S. Pat. No. 4,570,428 to Blackmore discloses a twin track buncher having a cradle upon which is supported two wire receiving bobbins, and wire guides at axial ends of the buncher for receiving and guiding two separate groups of wires in combination with a transverse mechanism laying each group of wires onto a respective bobbin.
U.S. Pat. No. 5,118,278 to Nishi

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