Claims
- 1. In an open-end spinning system, a method for graduated precision winding of a staple fiber yarn fed at a constant yarn speed onto a cheese rotating at constant circumferential speed, wherein the winding ratio during progressive building of the cheese is reduced in stages by graduations of decreasing size as the diameter of the cheese increases, each such graduation decreasing the winding ratio by a value not exceeding 0.3, and each such graduation decreasing the winding ratio being selected to be sufficiently small to produce a change in a crossing angle of the yarn during winding of between about ±0.8° of a predetermined set-point value for the crossing angle and selected to be sufficiently large to completely fill a smallest number of yarn winding diamonds occurring in the respective yarn winding stage.
- 2. The method of claim 1, characterized in that each graduation is selected to produce a change in the crossing angle of between about ±0.5° of the set- point value of the crossing angle.
- 3. The method of claim 1, characterized in that a graduation in a core region of the cheese is increased by a predetermined multiplier.
- 4. The method of claim 1, characterized in that each graduation is selected by calculating each successive winding ratio by subtracting from the then prevailing winding ratio an amount obtained by multiplying the integral component of the prevailing winding ratio by a graduation factor.
- 5. The method of claim 4, characterized in that the graduation factor is no greater than 0.05.
- 6. The method of claim 5, characterized in that the graduation factor is between 0.02 and 0.05.
- 7. The method of claim 1, characterized in that each graduation is selected by calculating each successive winding ratio by multiplying the then prevailing cheese diameter by a percentage factor, adding the resultant multiplication product to the prevailing cheese diameter, and converting the value of the resultant cheese diameter sum into a corresponding value for the successive winding ratio.
- 8. The method of claim 1, characterized in that each winding ratio is selected by adding to or subtracting from the prevailing winding ratio a supplemental step-up ratio derived from a quotient of a yarn spacing value and a number of diamonds for the prevailing winding ratio.
- 9. The method of claim 1, characterized in that each graduation is selected to obtain a successive winding ratio which will produce a desired known number of yarn winding diamonds.
- 10. The method of claim 9, characterized in that the number of yarn winding diamonds is no greater than 50.
Priority Claims (1)
Number |
Date |
Country |
Kind |
100 15 933 |
Mar 2000 |
DE |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims the benefit of German patent application 10015933.8 filed Mar. 30, 2000, herein incorporated by reference.
US Referenced Citations (6)
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Non-Patent Literature Citations (1)
Entry |
German Search Report. |