Textiles: spinning – twisting – and twining – Apparatus and processes – Driving
Patent
1981-04-20
1983-03-08
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Driving
57264, D01H 126, D01H 104
Patent
active
043757448
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an apparatus for controlling the rotational speed of the spindles of a spinning preparatory machine equipped with spindles and with flyers operatively coordinated thereto, as a function of the increasing bobbin diameter. The control apparatus contains a variator for driving the spindles, and such variator can be infinitely varied by using a control shaft which is stepwise rotated.
In a spinning preparatory machine of this type, also called roving frame or fly frame, a fibre roving is produced and is wound in parallel windings onto the bobbin of each spinning position, using a flyer. As the fibre roving is to be draftable as input material to be fed to the next processing step, a very low twist is imparted to it, barely sufficient for tensionless transfer of the fibre roving to a drafting arrangement of the subsequent processing step, but resulting in an undesirable faulty draft in the roving under the smallest tensile stress.
With such spinning preparatory machines it is necessary to drive both the spindle, and the flyer, which distributes the fibre roving over the bobbin surface and which flyer rotates coaxially with the spindle, and furthermore to precisely adjust the mutual rotational speeds.
In this arrangement the flyer, as a rule, rotates at a constant rotational speed, while the rotational speed of the spindle is adapted according to the increasing bobbin diameter: the spindle, in this arrangement, performs the reciprocating spindle rail stroke between two reversal points moving with respect to space as a function of the bobbin diameter, this traversing stroke ensuring for both the winding of the fibre roving in parallel windings onto the bobbin surface and the conical built or formed shape of the bobbin extremities.
The present invention deals with the problem of adapting the rotational speed of the spindle to the increasing bobbin diameter, and there is not specifically involved the reduction of the spindle rail traverse stroke as a function of the bobbin diameter.
The increase of the bobbin diameter, however, decisively depends on the technological properties of the roving produced, such as e.g. fibre type and quality, count (or linear density), twist, volume, etc. Experience has shown, that e.g. the volume of a roving of this type, or its cross-section respectively, depends on the air or climatic conditions, i.e. it can vary over time, and that also such minute variations already constitute a disturbing factor in the winding process, which is to be corrected using suitable means.
In the state of the art, countless propositions for controlling the rotational speed of a spinning preparatory machine of this type are known, in which machine, for obtaining the precision control which is required, usually a coarse control device and a fine control device are applied working in combination. Using the coarse control device, the best known form of which and that which is most universally utilized is a double-cone belt drive arrangement, the rotational speed of the spindle is roughly adapted to the geometric dimensions of the bobbin and in particular to its diameter. Using the fine control device, which frequently is in the form of a multi-member compensating rail, the speed ratio of the cone belt drive is influenced and a fine correction of the roving tension at different diameters of the bobbin is effected.
A solution of this type is shown, e.g. in Swiss Pat. No. 569,806. As a correcting rail here a control surface is used, which over the whole zone of the belt shifting of the cone belt drive exerts a correcting influence thereon. In a solution of this type with a double cone belt drive arrangement, of course, also adaption of the average speed of the belt shifting movement to the roving volume is required, which as a rule is effected by insertion of a gear train with exchangeable gears. Typical for this solution is the application of an infinitely variable variator, which is adjusted by a control shaft, which is rotated stepwise. The disadvant
REFERENCES:
patent: 3572026 (1971-03-01), Herubel
patent: 3892064 (1975-07-01), Araki et al.
patent: 4134253 (1979-01-01), Handa et al.
patent: 4254615 (1981-03-01), Adolf et al.
Briner Emil
Gasser Hermann
Novak Peter
Kleeman Werner W.
Petrakes John
Rieter Machine Works Ltd.
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