Textiles: spinning – twisting – and twining – Apparatus and processes – Alternate twist
Patent
1988-09-27
1990-12-04
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Alternate twist
57 9, 57294, 57311, 57314, H01B 1302
Patent
active
049744089
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to alternate reverse or so-called SZ-twisting.
More specifically, the object of the present invention is to provide an alternate reverse twisting method to form a product, such as a cable or similar, composed of an inner core element (9) and/or of alternately reversely twisted elongated elements (2) which can be wires, leads, optical fibers or their groups, or similar or which can be twisted as quads of wires, leads etc., by an alternate reverse twisting apparatus comprising: treated, output end of the treated elements (2,9), the treated elements (2,9) tightly against each other, and which means are arranged between said dividing and twisting means.
The object of the present invention is also to provide an alternate reverse twisting apparatus to form a product, such as a cable or similar, composed of an inner core element (9) and/or alternately reversely twisted elongated elements (2) which can be wires, leads, optical fibers or their groups or similar or which can be twisted as quads of wires, leads etc. The apparatus comprises different treatment stations from an upstream to a downstream end, as follows: elements (2,9) to be treated at the upstream end of the apparatus, end of the treated elements (2,9) between the upstream and downstream ends, pressing said treated elements (2,9) tightly against each other at the downstream end and which means are arranged between said dividing and twisting means (3,6).
Further the object of the present invention is the provision of an alternate reversely twisted product, such as an electric and/or optical cable, lead or similar elements.
Elongated elements as leads, wires or similar are conventionally produced in a SZ-twisting apparatus for example by means of a tracked pulling device from input sides for pulling the elongated elements through a first circumferentially perforated holeplate serving as a fixed dividing means and then through to an to an opposite directions by means of a periodically rotating second circumferentially perforated oscillating holeplate for serving as a twisting means and thereafter pulling the elongated elements into a pressing means, preferably a nipple, in which the elements are pressed tightly against each other. Further a spinning device can be used to bind the pressed elements as an alternate reversely twisted product. After completion of the stages using the pulling device, spooling either takes place or the twisted product can be fed to a next work phase. In this kind of a conventional SZ-twisting device it has usually been placed between the dividing and twisting means so that a tubular intermediate element rotating with the twisting means can be centrally fixed to it as well as mounted at its opposite end in bearings to rotate in relation to the dividing means.
This kind of a conventional arrangement includes, however, the disadvantage, that the rotation speed of the intermediate element is always constant, so that twisting turns of elongated elements tends to accumulate to the end towards the twisting means, whereby the pitch of the elongated elements becomes denser and their angular deviation into the twisting means increases. Then between the direction reverse points of the twisting direction the number of helices of the twisted elements is very limited being 10 at the highest, and also the force required for pulling the elements increases whereby the helices of the twisted product tends to open.
This main problem, i.e., an accumulation of the elements to be twisted, a large pulling force and a low number of helices has previously been tried to solve the problems by principally three different methods, however, without finding a satisfactory solution.
Firstly, according to patent publication U.S. Pat. No. 3,910,022 and U.S. Pat. No. 4,414,802 between a fixed dividing holeplate at one end and, at another end downstream of the other end, there is provided a periodically oscillating twisting holeplate for rotating in different directions, and a torsion-elastic torsion pipe is provi
REFERENCES:
patent: 3847190 (1974-11-01), Forester
patent: 3910022 (1975-10-01), Reed
patent: 4414802 (1983-11-01), Garner et al.
patent: 4426838 (1984-01-01), Garner et al.
patent: 4426839 (1984-01-01), Garner et al.
Derwent's Abstract No. J.8082 D/38, SU 781 982-Nov. 23, 1980.
Oy Nokia AB
Petrakes John
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