Device for producing covered yarn

Details Device for producing covered yarn Device for producing covered yarn

2000-06-08

2003-06-03

Worrell, Danny (Department: 3765)

Textiles: spinning, twisting, and twining

Apparatus and processes

Unitary multiple twist devices

C057S058520

Reexamination Certificate

active

06571546

ABSTRACT:

The present invention is relative to a device for manufacturing covered yarn in which one or several threads [yarns] are wound in a helical fashion around a yarn core. A rotating winding [respooling] spindle is provided with a spool [bobbin] on which the winding thread is located and with a fixed pot surrounding the winding spindle which pot can be divided along a geneatrix, especially in the axial direction of the pot.
DE 31 05 832 A1 describes a method and a device for manufacturing covered yarn. It discloses sheaths [jackets] which can be stationary or rotate at the same time and which are arranged around a system of hollow spindle and spool. Accordingly, the use of fiber-reinforced plastic can be provided for rotating sheaths. As a result of the rotating sheath of fiber-reinforced plastic the weight of this part is reduced, which makes possible a desirable, high spindle speed. The rotating sheath is fastened to the mounting of the hollow spindle and thus rotates together with the hollow spindle. It is therefore advantageous in this instance if a plastic is used as light material for the sheath in order to reduce the occurring centrifugal forces of the rotating parts. Nothing can be gathered concerning the material and the buildup in the case of a stationary sheath from the disclosure.
DE 196 26 549 A1 also shows a casing or a housing in a generic device which housing is arranged in a stationary manner and at an interval opposite the spool and surrounds at least the sheath surface of the spool. According to an especially advantageous embodiment the housing consists of two sheath [jacket] parts connected to each other in such a manner that they can pivot open and closed. The operation of such a device is particularly advantageous on account of the divided sheath since the spool is readily assessable when the winding thread has run out by opening the sheath and can be replaced with a full spool. The thread drawn off from the spool forms a balloon. This thread balloon is limited by the pot. In the case of rotating pots and quite particularly in the case of stationary pots surrounding the winding spindle the thread brushes along the inside of the pot while it is being drawn off, which produces a strain in particular on the closely adjacent pot. The pot wears down thereby, in particular at the high speeds of modem spinning winding machines. Current pots are either too cost-intensive in their manufacture or not sufficiently wear-resistant so that in some instances they must be replaced after a short operating time.
The invention therefore has the problem of creating a device, in particular a pot with which the above-cited disadvantages of a relatively rapid wear of the pot at the high speeds of modem spinning winding machines are eliminated and an effective energy savings during the operation of the spinning winding machine is achieved by the pot.
The invention is solved by a device with the features of claim 1. The friction of the winding thread, which brushes against the pot while it is being drawn off from the spool can be coordinated by a mechanically and/or thermally wear-resistant layer coordinated with the particular use. The pot, which functions as a balloon limiter for the thread, creates optimal frictional conditions for the thread with a mechanically and/or thermally wear-resistant layer. Moreover, in addition to the longer service life of the pot an even higher rotating speed of the winding spindles is possible in a particularly advantageous manner since the danger of a thread break can be distinctly limited by means of an appropriately adapted layer. Moreover, the layer also achieves in an especially advantageous manner an energy savings in comparison to traditional pots since the frictional conditions with the thread are optimized. The invention achieves particular advantages by virtue of the fact that the pot is designed to be stationary. In a stationary pot the drawing off of the winding thread can be distinctly improved by the appropriate layer or pot insert since in this instance the friction of the thread on the pot is particularly strong and therefore an adaptation of the frictional surface with an appropriate, wear-resistant and low-friction layer offers particular advantages.
If the pot consists of a base body and a mechanically and/or thermally wear-resistant layer surrounding the spool at least partially it is advantageously possible to adapt a pot optimally to the yarn to be processed as regards its mechanical and/or thermal properties and to use it. All that is necessary is to adapt a mechanically and/or thermally wear-resistant layer to the corresponding winding thread in order to obtain optimal wear results. The base body of the pot can be retained thereby. This creates a pot for various purposes which can be economically manufactured and, in particular, optimally designed. The base body with its fastening devices on the spinning winding device can be retained.
If the pot basically consists completely of the material of the mechanically and/or thermally wear-resistant and/or low-friction layer an especially simple embodiment of the invention is created. In the case of wear or damage to the layer the entire pot is replaced. On the other hand, the manufacture of the pot, especially if it is manufactured from a material which is easy to work such as, e.g., noble steel, is relatively economical.
It is advantageous if the layer is a pot insert arranged inside the pot on the base body. It is advantageous if the pot insert can be readily replaced. It can thus be replaced by a pot insert with a different layer for different purposes.
As a result of the ability of the pot to be divided along a geneatrix the spool can be replaced in a particularly simple manner when the winding thread has run out. As a result of the division of the pot the spool is more readily assessable so that it can be removed manually or automatically out of the device. If the division of the pot is arranged in the axial direction the complete spool is readily assessable by folding open the pot and can thus be replaced in a particularly simple manner.
In order to assure a reliable operation of the spinning winding device the divided pot can be closed with a hinge and a lock so that a simple operation and in particular a reliable operating position is assured as a result in that the divided pot can be reliably closed in order to avoid an unintentional opening of the pot during the spinning process.
In order to assure an especially simple operation of the device, that is, to be able to grasp the spool in a very simple manner and remove it from the spinning winding device and to be able to reinsert it, it is especially advantageous if the pot can be moved away on both sides of the spool. As a result of this opening of the device on both sides it is possible in a very simple manner to grasp and handle the spool since the pot has been removed sufficiently far from the spool and its winding plates. A stop is provided in order to assure a positionally exact closing of the pot. Both parts of the pot are moved against this stop and fastened in this position. The stop assures that the pot is arranged around the spool in a concentric manner when it is in closed position.
A stop is provided in an especially advantageous embodiment that functions as a stop with reference to the adjacent spindle. This reliably prevents the pot of this spinning location from striking against an adjacent spool or spindle and damaging it when a spinning location is opened. The stop functions here as a stop device when the pot of this winding spindle is. opened.
In an especially advantageous embodiment the stop for the concentric closing of the pot parts is identical to the stop for the adjacent pot. The stop has a double function here, namely, on the one hand the concentric closing of the one pot and on the other the protecting of this pot from being damaged by the adjacent pot. This danger of being damaged is especially present when the pot of the adjacent spinning locatio

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