Claims
- 1. A yarn piecing device, comprising an evaluation arrangement for determining parameters of an automatic piecing process, at least one sensor device for measuring yarn diameter and for detecting a location of a measuring point in respect to a yarn piecing, a control device operable initially in a test phase for controlling formation of at least one test piecing and controlling subsequent removal of the created test piecing prior to a supplementary delivery of additional fiber, means for determining the length of a thinner extent of the yarn downstream of the test piecing, and means for determining from the detected length of the thinner extent an amount of supplementary delivery of additional fiber required for compensating the thinner extent.
- 2. The piecing device in accordance with claim 1, characterized in that the control device is operable for controlling a reduction in drafting of the yarn during the test phase.
- 3. The piecing device in accordance with claim 1, characterized in that a profile of the thinner extent is formed from determining an average value from a plurality of test piecings.
- 4. The piecing device in accordance with claim 3, characterized in that the number of the test piecings used for forming the average value increases with an increased drafting of the yarn.
- 5. The piecing device in accordance with claim 3, characterized further by a device for displaying the piecing profile.
- 6. A yarn piecing device, comprising an evaluation arrangement for determining parameters of an automatic piecing process, at least one sensor device for measuring yarn diameter and for detecting a location of a measuring point in respect to a yarn piecing, a control device operable in a test phase for controlling formation of at least one test piecing without a supplementary delivery of additional fiber and controlling subsequent removal of the created test piecing, means for determining the length of a thinner extent of the yarn downstream of the test piecing, and means for determining from the detected length of the thinner extent an amount of supplementary delivery of additional fiber required for compensating the thinner extent, wherein the control device is operable for controlling a reduction in drafting of the yarn during the test phase and for determining the size of the draft reduction by means of an algorithm which takes into consideration a staple length and a limited measuring range for measuring the yarn diameter.
- 7. A yarn piecing device, comprising an evaluation arrangement for determining parameters of an automatic piecing process, at least one sensor device for measuring yarn diameter and for detecting a location of a measuring point in respect to a yarn piecing, a control device operable in a test phase for controlling formation of at least one test piecing without a supplementary delivery of additional fiber and controlling subsequent removal of the created test piecing, means for determining the length of a thinner extent of the yarn downstream of the test piecing, and means for determining from the detected length of the thinner extent an amount of supplementary delivery of additional fiber required for compensating the thinner extent, wherein the control device is operable for controlling a reduction in drafting of the yarn during the test phase and the draft during the test phase is determined by multiplying a nominal draft with a predetermined factor.
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 55 674 |
Nov 1999 |
DE |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims the benefit of German patent application DE P 19955674.1 filed Nov. 19, 1999, herein incorporated by reference.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4712367 |
Lassmann |
Dec 1987 |
A |
4825632 |
Raasch et al. |
May 1989 |
A |
5832709 |
Lassmann et al. |
Nov 1998 |
A |
6035622 |
Fox et al. |
Mar 2000 |
A |
Foreign Referenced Citations (4)
Number |
Date |
Country |
34 40 009 |
Dec 1987 |
DE |
37 16 728 |
May 1989 |
DE |
196 49 329 |
Jun 1997 |
DE |
40 30 100 |
Mar 2000 |
DE |
Non-Patent Literature Citations (2)
Entry |
Raasch et al German Publication entitled “Automatisches Anspinnen beim OE-Rotorspninen” (Automatic Piecing in Open-End Rotor Spinning), Melliand Textilberichte (Textile Reports); Mar. 1989, pp. 251 to 256. |
German Search Report. |