Sliver deflecting mechanism in a regulated draw frame

Details Sliver deflecting mechanism in a regulated draw frame Sliver deflecting mechanism in a regulated draw frame

2000-08-22

2001-09-25

Worrell, Danny (Department: 3741)

Textiles: fiber preparation

Working

Drafting

Reexamination Certificate

active

06292982

ABSTRACT:

This application claims the priority of German Application No. 199 06 139.4 filed Feb. 13, 1999, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a regulated draw frame for a sliver bundle composed of cotton or chemical fibers or the like and is of the type which has at least one draw field, a regulated drive system for determining the extent of draw in the draw field, a programmable control device for the drive system and at least one sensor to determine the mass of the running fiber per length unit at a measuring location. A signal determining the extent of draw is stored for a predetermined period in a memory of the control device. Information for adapting and/or determining the quality of the input slivers is extracted from the stored values. Such information is to include, for example, the CV value of the input sliver bundle, its spectrogram and/or its length variation curve. The signal determining the extent of draw may be an output signal of a sensor or a setting signal for the drive system. Sliver sensors at the intake end and at the outlet end of the draw unit are provided for measuring the mass fluctuations of the slivers.
The above-outlined conventional arrangement has, among others, the following disadvantages:
The adaptation of the draw unit is limited to the regulation of the principal drawing process, that is, to an rpm regulation of the drive motors for the rolls of the draw unit. The information is to be gleaned only from data relating to the input sliver bundle. Obtaining the information has to be performed by a complex system and further, the adaptation is provided only for a certain processed fiber lot.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved regulated draw frame of the above-outlined type from which the discussed disadvantages are eliminated and which, in particular, significantly improves the adaptation of the draw frame to each fiber lot and/or to any quality changes of the produced fiber structure.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the regulated draw unit for drawing sliver running therethrough includes a plurality of roll pairs each defining respective nips through which the sliver consecutively passes in a running direction. A pressure bar which is situated between two adjoining roll pairs has a region for contacting the running sliver. The pressure bar is supported in such a manner that the pressure bar region is spaced from an imaginary straight line extending from the nips of the two adjoining roll pairs, whereby the running sliver is deflected. A measuring device is coupled to the pressure bar for emitting signals representing forces applied to the pressure bar by the running, deflected sliver.
By virtue of the invention, an adaptation (setting) of the draw frame can be significantly improved. Undesired deviations from the desired magnitudes such as machine-specific values and/or values relating to fiber technology in each fiber lot and/or quality changes of the produced fiber may be recognized in a simple manner from the electric signals. The kind and extent of the deviation is determined. Advantageously, undesired deviations may be recognized during operation and may serve for adapting the draw frame, for example, by changing the clamping line (nip) distances and/or draws by the operating personnel. The invention further permits a computer-assisted evaluation and a corresponding adaptation of the draw unit based on the results of evaluation either by the operating personnel or automatically by the computer.


REFERENCES:
patent: 2905976 (1959-09-01), Matthew et al.
patent: 4075739 (1978-02-01), Staheli
patent: 4864694 (1989-09-01), Konig et al.
patent: 5230125 (1993-07-01), Clement et al.
patent: 5461757 (1995-10-01), Leifeld
patent: 5490308 (1996-02-01), Huber et al.
patent: 5535488 (1996-07-01), Yao et al.
patent: 5815889 (1998-10-01), Barth et al.
patent: 821023 (1959-09-01), None

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