Claims
- 1. An arrangement for producing packages used as feeding packages for twisting and having two yarn components which are wound up side-by-side comprising:
- drafting means for drafting the two yarn components,
- prestrengthening means for prestrengthening the drafted yarn components,
- guiding means for guiding together the two yarn components to form a double yarn,
- withdrawing means for withdrawing the double yarn,
- winding means including cross-winding means for cross-winding the double yarn on a package,
- yarn component detection means arranged behind the prestrengthening means for detecting the respective yarn components, and
- processing device means for processing the double yarn in such a manner as to assure disposition of the two yarn ends in position for a subsequent separate piecing operation involving locating and returning the two yarn ends to a piecing apparatus other than the processing device means, wherein the processing device means is disposed at a position substantially spaced from the detection means and directly in front of the winding means to thereby lengthen the time period for a broken yarn end to travel between the detection means and the processing device means, and wherein a yarn guide is arranged between the cross-winding means and the processing device means to limit cross-winding in the area of the processing device means.
- 2. An arrangement according to claim 1, wherein the processing device means is arranged between a yarn length compensating device and the cross-winding means.
- 3. An arrangement according to claim 2, wherein a suction device is arranged between the processing device means and the compensating device, said suction device being actuable by the yarn component detectors means.
- 4. An arrangement according to claim 3, wherein a yarn testing device for the double yarn is connected in front of the processing device means.
- 5. An arrangement according to claim 3, wherein the processing device means is equipped with devices for cutting the double yarn.
- 6. An arrangement according to claim 3, wherein the processing device means is equipped with devices for connecting the two yarns.
- 7. An arrangement according to claim 2, wherein a yarn testing device for the double yarn is connected in front of the processing device means.
- 8. An arrangement according to claim 2, wherein the processing device means is equipped with devices for cutting the double yarn.
- 9. An arrangement according to claim 2, wherein the processing device means is equipped with devices for connecting the two yarns.
- 10. An arrangement according to claim 1, wherein a yarn testing device for the double yarn is connected in front of the processing device means.
- 11. An arrangement according to claim 10, wherein the processing device means is equipped with devices for cutting the double yarn.
- 12. An arrangement according to claim 11, wherein the processing device means contains a pneumatic twisting nozzle.
- 13. An arrangement according to claim 10, wherein the processing device means is equipped with devices for connecting the two yarns.
- 14. An arrangement according to claim 1, wherein the processing device means is equipped with devices for cutting the double yarn.
- 15. An arrangement according to claim 14, wherein the processing device means contains a pneumatic twisting nozzle.
- 16. An arrangement according to claim 1, wherein the processing device means is equipped with devices for connecting the two yarns.
- 17. An arrangement according to claim 16, wherein the processing device means contains a pneumatic twisting nozzle.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 3819858 |
Jun 1988 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 07/361,321, filed June 5, 19898 now abandoned.
The invention relates to an arrangement for producing packages used as feeding packages for twisting, which contain two yarn components wound up side-by-side. The arrangement includes drafting devices for drawing two slivers into yarn components, prestrengthening devices for the prestrengthening of the drafted yarn components into yarns, guiding devices for guiding together the two yarns to form a double yarn, withdrawing devices for withdrawing the double yarn and winding devices for winding the double yarn on a package. The winding devices contain devices for the cross-winding. Yarn detectors are provided which are arranged behind the prestrengthening devices for the prestrengthening and control a processing device which is assigned to the double yarn.
In the arrangement of my commonly assigned pending U.S. Pat. Application Ser. No. 07/311,731, filed Feb. 17, 1989 now U.S. Pat. No. 4,947,633, the processing device is constructed as a separating device which is arranged in the area in which the double yarn cross-winds. If one of the two yarn components breaks, a cutting of the still existing double yarn takes place so that the two yarns have at least approximately the same length and their ends are located at the same point on the package. As a result, it is possible to find the double yarn by means of an automatic searching device during a piecing and to withdraw it.
In another arrangement disclosed in my commonly assigned Pending U.S. Pat. Application Ser. No. 07/340,708, filed Apr. 20, 1989 now abandoned, if a yarn breaks, the winding up of the double yarn on the package is interrupted, the unbroken yarn being gripped and held at a given point. It can then be picked up at this point by an automatic piecing device. During the withdrawal of the unbroken yarn, the broken yarn is also withdrawn from the package so that also its end is found easily and without any problems. In order to, in the case of this arrangement, facilitate the taking-along of the broken double yarn during a withdrawal from the package, a processing device is provided in the form of a connecting device which is activated by the yarn detectors and which connects the broken yarn component with the unbroken yarn component.
An object of the invention is to increase the effectiveness of the arrangement of the initially mentioned type.
This object is achieved in that the processing device is connected directly in front of the devices for the winding-up, a yarn guide being arranged between the devices for the cross-winding and the processing device.
By means of this construction, the processing device is moved as closely as possible in the direction of the package, so that the largest possible distance is maintained between the yarn detectors and the processing device. In view of the high operating speeds, this distance is advantageous since otherwise there is the risk that, in the time period which a yarn detector requires for the actuating of the processing device, the broken yarn end may already have passed through the area of the processing device. By means of the yarn guide arranged behind the processing device, it is ensured that the double yarn does not cross-wind in the area of the processing device, i.e., that it is continuously located in the area of the processing device, so that this processing device can act upon the double yarn immediately in the case of a corresponding signal.
In a further development of preferred embodiments of the invention, it is provided that the processing device is arranged between a compensating device and the devices for the cross-winding. The compensating device provides that the changes of length in the double yarn are absorbed which occur during the cross-winding movement, without the occurrence of tensions which are unacceptable for the double yarn which is formed of relatively weak yarns. In this case it is contemplated to coordinate the start of the operation of the processing device triggered by one or both yarn detectors with the speed of the double yarn existing between the device for the cross-winding and the compensating device, so that the carrying-out of the separating cut as well as, as an alternative, a connecting of the two yarns can be carried out particularly effectively.
The yarn detectors are connected directly behind the devices for the prestrengthening which are preferably constructed as pneumatic false-twisting devices. In the yarn components, a false twist is generated which opens up when the false-twisting devices are left so that, in this area, the yarns only still have the strength which was caused by the prestrengthening; i.e., they are relatively weak. It is therefore expedient to arrange the yarn detectors directly at the outlet of the false-twisting devices since, on the one hand, this is the area most at risk, while, on the other hand, in this area, a possible yarn breakage can be detected the earliest. Yarn detectors are used preferably which have only a yes-no function; i.e., react to the presence or absence of a yarn. The currently known yarn detectors, which, in addition, have a testing function with respect to the quality, are still relatively slow. If the existing yarn moving path between the yarn detectors and the processing device, in view of the high production speed and the response time of the yarn detectors and/or of the processing device should be too short, it is possible to extend the yarn moving path by means of deflecting guides and to adapt it to the allowed time.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
US Referenced Citations (7)
Foreign Referenced Citations (1)
| Number |
Date |
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| 3634464 |
Apr 1988 |
DEX |
Continuations (1)
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Number |
Date |
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| Parent |
361321 |
Jun 1989 |
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Patent Grant
5044150
