Textiles: spinning – twisting – and twining – Apparatus and processes – Feeding
Reexamination Certificate
1999-11-18
2001-03-06
Calvert, John J. (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Feeding
C057S279000, C019S157000
Reexamination Certificate
active
06195974
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a process and to a device for the automatic introduction of a fiber sliver into a textile machine equipped with a feed mechanism. The fiber sliver is brought with its end into a defined receiving position in which it is introduced into the feed mechanism.
DE 40 35 439 A1 discloses a method by which a fiber sliver end hanging out of a can is taken up by a relative movement between fiber sliver and sliver feeder and is then prepared for introduction into a spinning machine. To prepare this fiber sliver, it is proposed that a piece of the grasped fiber sliver end be torn off, causing a thinning out and tapering of the fiber sliver end.
In this known embodiment, it is a disadvantage that the fiber sliver end which was torn off must be scrapped. This causes a loss in raw material and the problem of collecting and removing scrap which is produced in large quantities in the course of the operation of the device. Another disadvantage of this known embodiment is the fact that the fiber sliver end to be grasped by the feed mechanism becomes so thin because of the thinning-out and tapering of the fiber sliver end before its introduction into the feed mechanism that the desired result is not achieved with some materials.
OBJECTS AND SUMMARY OF THE INVENTION
It is therefore a principal object of the instant invention to create a process and a device for the automatic introduction of a fiber sliver that can be used reliably with all materials and results practically in no material loss. Additional objects and advantages of the invention will be set forth in, or obvious from, the following description, or may be learned by practice of the invention.
The objects are attained by a process in which a predetermined length of the end of the fiber sliver is grasped, is shortened to a second predetermined length, and is then introduced into the feed mechanism. In this process it is advantageous that fiber slivers of very different lengths can be presented to the grasping device by grasping a first predetermined length of a fiber sliver. Thanks to the great allowable tolerance in fiber sliver presentation, the first predetermined length, which is relatively great by comparison with the second predetermined length is securely grasped. The greater the first predetermined length, the greater the tolerances which can be allowed in fiber sliver presentation.
For further processing, in particular for the introduction of the fiber sliver into the feed mechanism, it is advantageous if the fiber sliver length is as short as possible. This makes it possible to obtain more precise introduction movements when the fiber sliver is slack. Due to the fact that the first grasped length is known, simple automatic process, such as by means of time control or distance control components, can be used to shorten the fiber sliver to the second predetermined length.
According to the invention, the fiber sliver end is grasped by a first grasping device and is then transferred to a second grasping device. The first predetermined length of the fiber sliver end is set in the first grasping device, and the fiber sliver is shortened to the second length in the second grasping device.
The fiber sliver is advantageously grasped by the first grasping device at the can in which the fiber sliver is presented to the textile machine. The second grasping device conveys the fiber sliver into proximity of the feed mechanism of the textile machine and assists in the subsequent introduction.
The first predetermined length is advantageously obtained by means of a suction pipe. The suction pipe seizes a fiber sliver end hanging over the rim of the can and sucks it in. If long cans are used, where the fiber sliver end hangs over the narrow side of the long can, it suffices to convey the suction pipe along this narrow side. If the suction pipe grasps the fiber sliver at a point where the length to the end of the fiber sliver is shorter than the length of the suction of the suction pipe, the fiber sliver end is sucked into the suction pipe and is pulled straight. The suction pipe is advantageously delimited at a point in such manner that the fiber sliver can be sucked in only as far as that point. Additionally, missing fiber sliver is pulled from the can so that the suction pipe is completely filled with fiber sliver up to the limit point. If the fiber sliver end hanging from the can is longer than the suction point from the point at which it is seized to its end, a loop forms in the suction pipe. The loop is disappears again after transfer to the second grasping device.
The fiber sliver, of which a predetermined length is now present, is conveyed by this first grasping device to a second grasping device. The second grasping device is advantageously designed so that it grasps the fiber sliver on the one hand, and is able to change the length of the fiber sliver on the other hand. When the fiber sliver has been shortened, the second grasping device conveys the fiber sliver to a loop catcher of the feed mechanism. If the fiber sliver is sucked in by the loop catcher on the one hand and is conveyed by the second grasping device through the loop catcher on the other hand while the fiber sliver is again extended in the second grasping device, easy and secure introduction of the fiber sliver is ensured.
If the fiber sliver is brought to a point after passing through the loop catcher or before introduction into the feed mechanism, this introduction into the feed mechanism is facilitated. Fibers in the fiber sliver would then not stick out and would not cause problems with the introduction.
The fiber sliver is advantageously introduced into the feed mechanism by a conveyor. If the feed mechanism is opened before the introduction of the end of the fiber sliver and is closed again when the end of the fiber sliver is present between the feed rollers, the introduction process is facilitated.
The fiber sliver is advantageously assisted by the conveyor, as well as by the second grasping device which guides the fiber sliver as it is introduced into the feed mechanism.
The device according to the invention is designed so that the end of the fiber sliver can be received by a first grasping device at a first predetermined length and can be shortened to a second predetermined length by means of a second grasping device. The two grasping devices make it possible to receive first a fiber sliver to which great tolerances apply and to shorten this fiber sliver subsequently to a length that is suitable for introduction of the fiber sliver into the feed mechanism.
It is especially advantageous for the first grasping device to be a suction pipe. To limit the length of the aspired fiber sliver, a sieve is advantageously provided. The aspired fiber sliver is thus aspired as far as the sieve, plugs up the sieve and thus terminates the suction process. The fiber sliver is then present in a defined length which corresponds to the length of the suction pipe.
To avoid that fibers of the fiber sliver hook into the sieve, the sieve is given a relatively great length. This length makes it impossible for the fibers to form hooks behind the sieve on the one hand, and from remaining in the fiber sliver on the other hand. Thus, as the fiber sliver is removed, such fibers do not hook into the sieve and thus do not plug up the sieve in course of its utilization.
The first grasping device is advantageously brought in such manner to a can containing the fiber sliver that it reaches the area in which an end segment of the fiber sliver is located. If the can is a so-called long can it suffices if the grasping device searches a narrow side of the can for the presence of a fiber sliver if the fiber sliver has been deposited on this narrow side. With round cans it may be necessary for the grasping device to search for and to take up the fiber sliver on the circumference of the round can. It is also possible for the fiber sliver end to be held in a clamp provided on the can, from which the first grasping device can take up the fiber
Greis Dietmar
Tuschl Robert
Calvert John J.
Dority & Manning
Rieter Ingolstadt Spinnereimaschinenbau AG
Welch Gary L.
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