Textiles: spinning – twisting – and twining – Apparatus and processes – With drafting
Patent
1982-03-12
1984-11-27
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
With drafting
57 6, 57 18, 57310, 57281, D02G 304, D02G 338
Patent
active
044844352
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a method of production of yarns from sliver of textile fibres and its attenuation into roving, where the latter is strengthened by wrapping with a fine filament yarn, drawing of the roving in the drawing equipment of a spinning-machine down to the required yarn thickness, and strengthening of the fibre ribbon which arises in doing so, e.g., by imparting twist, as well as a device for the performance of the method.
A roving capable of being drawn, produced by wrapping with a filament yarn, is described in the West German No. P 24 47 715. As the prerequisite for satisfactory drawing characteristics it is mentioned in it that the elongation at rupture of the enwrapping filament yarns must be extraordinarily low and also a definite geometrical arrangement of the filament yarns in the roving is necessary.
Rupturing the filament portion in the pre-drawing zone suggests itself, since then a fibre ribbon is fed to the main drawing zone, which may be drawn completely unimpeded. Through the examples quoted in the patent specification the possibility of pursuing this course is described.
Moreover if the elongation at rupture of the enwrapping filament yarn is higher than specified in the example of the West German No. P 24 47 715, an alteration of the geometrical arrangement of the enwrapping filament yarn in the roving as is caused, e.g., by an alteration in the balloon tension during wrapping, may prevent uniform rupture of it. This then leads to trouble in drawing in the main drawing zone.
Greater pre-drawing might in this case lead again to more uniform rupture of the filament yarns. But it has been established that the uniformity of the yarn thereby becomes impaired.
The production of filament yarns having the low elongation at rupture necessary for roving of that kind is described in the West German O/S No. 26 14 523. This way is not simple technically and above all is loaded with additional costs which make more difficult an economical application of rovings wrapped with filament yarns.
A method of production of yarns for wrapping, which in principle is suitable also for the production of wrapped rovings, is described in the West German A/S No. 24 28 483. For improvement of the course of the process as regards quality of yarn and thread breakage but also for the saving of energy, various executions of the wrapping unit are described in the patent literature.
Thus in the West German O/S No. 28 33 326 it is proposed to surround the hollow spindle and bobbin of filament yarn for wrapping, with a can rotating with it, which is provided with a removable cover in the centre of which is fitted an axially adjustable thread guide tube rotating with it.
In the West German O/S No. 29 02 404 a hollow spindle is described which is surrounded by a stationary cylinder which is closed with a cover and in the interior of which prevails a raised air pressure.
The West German O/S No. 29 13 762 describes a hollow spindle which is likewise surrounded by a stationary cylinder, and the bobbin of yarn for wrapping is closed off by an arched cover.
For a satisfactory course of the process it is necessary to put the wrapping point as close as possible to the delivery mechanism for the sliver. But in the case of the stated constructions of spindle this is only possible if for the fitting or respectively removal of the bobbin with the yarn for wrapping, the axis of the hollow spindle is shifted so far that the bobbin does not come into contact with the delivery mechanism.
The removal from the hollow spindle of the bobbin with the yarn for wrapping is also made more difficult by the various casings proposed, which indeed must have only a slight clearance from the bobbin. The removable cover in addition makes more difficult the exchange of the bobbin.
Upon starting spinning or in the case of breakage of the wrap yarn the bobbin with the wrap yarn must each time be removed from the hollow spindle, the end of the yarn sought, the bobbin mounted again and the end of the yarn threaded into the hollow spindle. Although t
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Dority Julian W.
Watkins Donald
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