Winding – tensioning – or guiding – Helical or random winding of material
Reexamination Certificate
1997-06-26
2001-10-16
Mansen, Michael R. (Department: 3653)
Winding, tensioning, or guiding
Helical or random winding of material
Reexamination Certificate
active
06302349
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method and an apparatus for the production of random wound yarn packages at a winding station of a winding machine having a friction roller for driving the yarn package and sensors for the continuous detection of values representative of the angular velocities of the friction roller and the yarn package and, in particular, relates to such a method and apparatus wherein a value representative of yarn application is calculated which is indicative of the winding density of the yarn package being wound.
BACKGROUND OF THE INVENTION
In German Patent Publication DE 42 39 579 A1, random wound yarn packages are produced at a winding station of a winding machine having a friction roller for driving the yarn package and sensors for the continuous detection and evaluation of the angular velocities of the friction roller and the yarn package. Specifically, this reference discloses the detection and evaluation of the angular velocities of the friction roller and the yarn package at a winding station for the detection of so-called pattern winding zones and the subsequent initiation of pattern disruption methods when pattern zones are detected in order to prevent or reduce pattern windings on the yarn package. However, the invention of German Patent Publication DE 42 39 579 A1 relates only to pattern windings and there exists a need for a method of monitoring the winding density of the yarn package during the winding operation.
OBJECTIVE AND SUMMARY OF THE INVENTION
It is an objective of the present invention to insure the quality of the yarn package produced at a winding station by monitoring the density of the yarn package as it is being wound and, if required, adjusting parameters of the winding process during the winding process in order to improve the yarn package quality.
Briefly summarized, the method of the present invention which obtains this objective includes continuously detecting during a winding process the angular velocities of the yarn package and the friction roller and calculating therefrom a value for the yarn application of the yarn package being wound.
As used in the present invention, “yarn application” is a mathematically defined herein as one-half the increase in the yarn package diameter (i.e., the increase in the radius of the yarn package) for each revolution of the yarn package during the course of the winding process, and yarn application can be expressed as a function of the number of revolutions of the yarn package or, alternatively, as a function of time. Yarn application is an important characteristic value representative of the quality of a yarn package because it indicates the winding density of the yarn package. For example, if the yarn application during a winding operation is substantially uniform and constant, the winding density will be substantially uniform and constant and the yarn package will have advantages over other yarn packages during further processing, such as during dyeing and, in particular, during unwinding.
In one feature of the present invention the yarn application values are recorded as a function of time and, alternatively, as a function of the yarn package diameter during the winding operation. This can be done, for example, by graphing the function simultaneously with the winding operation. It is also possible to store the yarn application values for later print out, or for later display of a graph thereof on a monitor so that the quality of a yarn package can be judged.
In a further feature of the present invention the diameter of the yarn package is calculated from the yarn application values and is compared with a threshold value corresponding to the maximum yarn package diameter to be produced, whereby the winding operation of the yarn package is stopped when the maximum yarn package diameter is reached. It is thereby possible to produce yarn packages having a uniform diameter.
In yet a further feature of the present invention the yarn application values are continuously compared to set values, at least in an area of a pattern winding zone, and if deviations are detected, the parameters of the winding operation are adjusted so that the yarn application values more closely match the set values. Thus, particularly in the area of a pattern winding zone, it is possible at least to reduce winding density fluctuations in this area so that a yarn package of improved quality can be produced.
The present invention also includes a winding station of a winding machine which performs the method of the present invention having a control and evaluation device that continuously detects and evaluates yarn application values during the winding process.
Further features and benefits of the present invention will become apparent to one of ordinary skill in the art from the following detailed description and from the drawings. For example, it should be recognized that in spite of a compensation of the contact force with which the yarn package rests on the friction roller during the winding process, and in spite of the regulation of the yarn tension at a constant value, both methods of which are conventionally known, relatively high density fluctuations nevertheless still occur, especially in the areas of pattern zones; an additional benefit of the present invention is that the yarn application values detected during pattern windings in the winding process indicate the effectiveness of a particular pattern disruption method used during a particular winding process.
REFERENCES:
patent: 4805844 (1989-02-01), Hermanns et al.
patent: 4964582 (1990-10-01), Hermanns et al.
patent: 5141169 (1992-08-01), Sugioka
patent: 5954289 (1999-09-01), Hermanns et al.
Hermanns Ferdinand
Meyer Urs
Kennedy Covington Lobdell & Hickman LLP
Mansen Michael R.
W. Schlafhorst AG & Co.
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