Textiles: fiber preparation – Working – Drafting
Patent
1991-05-31
1994-05-24
Crowder, Clifford D.
Textiles: fiber preparation
Working
Drafting
474 92, D01H 518, F16H 710
Patent
active
053136896
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The instant invention relates to a drawing frame to draw fiber slivers with drawing rollers constituting pre-drawing and main drawing roller pairs and power transmission means to drive said drawing rollers as well as a sliver discharge mechanism.
2. Background of Art
The utilization of drawing rollers with two or more pairs of rollers to draw fiber slivers is known. The circumferential speed of the pairs of rollers increases from the inlet of the drawing frame to the outlet of the drawing frame. The lower roller of the roller pairs is driven by toothed wheels or toothed belts so to produce the slippage-free operation which is absolutely necessary for orderly drawing of the fiber slivers. The upper rollers are pressed against the lower rollers and the rollers thus clamp the fiber material running through between them.
It has been shown that toothed-wheel drives as well as toothed-belt drives of the drawing frame rollers have a detrimental effect upon the uniformity of fiber sliver drawing.
With toothed-wheel drives the clearance which exists between the individual teeth of the toothed wheels causes the roller pairs not to be driven simultaneously but one after the other, especially during run-up of the drawing-frame. This produces irregularities in the drawing of the fiber sliver.
DE-OS 20 44 996 proposes driving the drawing rollers via toothed belts. When such drives are used it was found that the accumulation of dirt between the teeth of the drive and deflection wheels over which the toothed belts are guided, as well as between the teeth of the toothed belt, cause irregular rotational movements of the drawing frame rollers to be produced. These irregularities lead to interference in the drawing of the fiber sliver as well as to increased wear of the drive elements. Especially where small toothed wheels are used and with toothed belts with small tooth divisions, such as are required for predrawing rollers because of the limited space available, soiling of the tooth clearances has a very detrimental effect. Manual cleaning of drive and deflection wheels as well as of the toothed belts is time consuming.
In addition to dirt, the oscillating characteristics of the drive means at the constantly increasing drawing speeds seriously impair the uniformity of fiber sliver drawing. Toothed-belt drives have unfavorable oscillating characteristics at high predrawing speeds.
SUMMARY OF THE INVENTION
It is the object of the instant invention to create a substantially maintenance-free drawing-frame roller drive without slippage between the drive element and the drawing-frame roller, making it possible to drive the drawing-frame rollers in an orderly, uniform and rapid manner.
This object is attained through the instant invention in that power transmission means are used to drive the drawing-frame rollers, whereby at least one of these power-transmission means is a flat belt wrapping around the driving wheels, with the loop of the flat belt wrapping around at least one of the driving wheels being increased by the installation of deflection pulleys. Flat belts surprisingly make it eminently possible to achieve high speeds of the drawing-frame rollers at delivery speeds of over 500m/min. Their utilization as power-transmission means to drive drawing-frame rollers has apparently failed until now because it did not appear possible to ensure slippage-free transmission of the drive forces in this manner. By installing deflection wheels to increase the angle of wrap of the flat belt around the driving wheels of the drawing-frame rollers it has been possible for the first time to achieve slippage-free and thereby precisely adjustable rotational speeds of drawing-frame rollers in the field of roller drawing frames. By providing deflection wheels, the wrap of the flat belt around the driving wheels is increased to such an extent that the power transmission makes it possible to achieve slippage-free and therefore precisely adjustable rotational speeds of drawing-frame rollers. By
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Crowder Clifford D.
Izaguirre Ismael
Schubert & Salzer Maschinenfabrik Aktiengesellschaft
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