Textiles: fiber preparation – Assembling – Web forming
Patent
1992-03-04
1994-02-22
Crowder, Clifford D.
Textiles: fiber preparation
Assembling
Web forming
19105, D01G 2306, D01G 916
Patent
active
052876004
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method as well as a device for controlling an opening process, for example at a card or cleaning machine, in which an opening element is moved past a fiber feed and fibers are loosened and transferred and which simultaneously attenuates the fiber feed.
Even though, the method in accordance with the invention or the device in accordance with the invention is advantageously applied at a card, the method or the device is not exclusively employed with a card, the method or device being able to be employed in general for controlling the drive of the opening elements, e.g. also at a cleaning cylinder of a cleaning machine.
Many controls and regulations have been proposed contemporarily which enable the rotating speed of the opening elements to be approached at or controlled according to certain predetermined values, furthermore, to enable an adjustment to other parameters.
It is the object to reach a predetermined quality of the product at a highest-possible production rate in order for the end product, i.e. the finished yarn, also to reach a desired quality and furthermore not to disturb the various other steps in the course of the yarn production, for example, with frequent thread breakage.
The quality criteria with, e.g. a card, which are of importance here are low nep number in the card sliver little or no staple damage and little residual dirt content of the fibers.
Although there are attempts to create methods or devices to directly measure the nep number, staple length and residual dirt content during the operation of the card, this has not yet been successfully done to a sufficient degree, the corresponding parameters having to be determined in laboratory tests, at least in the foreseeable future. For this reason such parameters cannot be used directly, i.e. on line, for the control of the production process. Based on collected experience we know today the desirable basic adjustments of the parameters of the yarn producing machine for each fiber mixture.
Even if these basic adjustments for the various parameters are known and it is also known how these parameters must be mutually adjusted during run-up and stopping of the machine or installation, there still remains a very big margin for optimizing the mutual adjustments of speeds in order to increase the quality of the product, even when no production increase is aimed at, e.g. because a critical part of the installation is already set at the upper limit of its output.
Research has already been done in order to determine the so-called card force at high-production cards, probably aiming at developing optimum forms for the spiked clothings or determining optimum adjustments for opening the fiber feed into single fibers.
There is, for example, a report in Melliand Textilberichten February 1973, pp. 107-115, by Dr. Ing. Peter Artzt and Ing. grad. Osswald Schreiber about investigation on the conditions in the area of the taker-in. The authors noticed that the fiber is subject to high stress in the region between the feed trough and the taker-in and can be transported to the swift in a torn or in a flocculated form, i.e. with staple reductions or with insufficient previous opening.
The authors determined the moment at the taker-in caused by the opening of the supplied fiber as measure for the fiber stress.
In practice it was proven that the measurement of the moment at the taker-in is extremely difficult, because the forces to be measured are very little in relation to the massive construction of the taker-in, which is also expressed in the report.
In a later report (Melliand Textilberichte September 1973, pp. 885-888) the same authors report on a photographic method for determining the fiber coating of the swift in order to determine the quality of the previous opening and hence the dependence of the feed and the taker-in speed at high production cards.
These measurements can have their justifications, and can be suitable for the performance of trial courses, but they are not suited for the direct control of, e.g., the ope
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Melliand Textilberichte, Feb. 1973, pp. 107 through 115, by Dr.-Ing. Peter Artzt and Ing. (grad.) Oswald Schreiber.
Melliand Textilberichte, Sep. 1973, pp. 885 through 888, by Dr.-Ing. Peter Artzt and Ing. (grad.) Oswald Schreiber.
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Calvert John J.
Crowder Clifford D.
Maschinenfabrik Rieter AG
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