DD286002A5 - PROCESS FOR PREPARING PREPARATION PULES - Google Patents

Abstract

The invention relates to a method for producing roving bobbins for automatic ring spinning machines and relates to the field of roving. The purpose of the invention is to provide a method for producing roving bobbins, which avoids damage or ripping of the roving when using roving bobbins for the automatic roving bobbin changing process. The invention is based on the object of developing a method for the production of roving bobbins for automatic roving bobbin change on the ring spinning machine, with which optimum take-off conditions under extreme mechanical roving stresses are guaranteed on the roving bobbin. In accordance with the present invention, this has been accomplished by a method that varies roving twists within a roving bobbin winding by optimizing the number of roving plies and the increased fluence rate by per se known counters and regulators in a microcomputer so that the roving over a given number of roving plies will have an optimum Increased turn of 10-30% gets. Fig. 1 {roving bobbin; roving; Vorgarnspulenwechselprozesz; Withdrawal conditions; Creel; roving; Fluegeldrehzahl; Counter; regulator; Microcomputer; Sliver}

Description

It is known and procedural condition that the tensile strength of roving at the beginning of coil formation

swelling winding forces, in particular beating sleeves, is reduced.

These production-related influences, especially if they lead to extreme Vorgarnzugkräften, the fiber strand

schfidigen.

In exposed areas of the coil winding, where the roving additionally high mechanical stresses,

For example, during the automatic bobbin changing operation, were inventively in

Rewind process by increasing the wing speed by 10-30% in the roving real multi-turns generated. The length of the provided with multi-turns Vorgarnstückes depends on textile-technological aspects, such as

the bobbin change time, which is programmable and controllable in the microcomputer. The acted upon by multi-turns

Vorgar / istück is completely required for the change process or gets as remaining on the sleeve remaining piece in the

Waste.

The multi-turns are depending on the requirements of the strength of the roving preferably at the beginning of the coil and on Coil end produced (Fig. 1). To carry out the automatic bobbin changing process inevitably several turns with over-twisted Roving at the beginning of the coil needed (Fig. 2). For the realization of. * Predetermined technological parameters in the Bewicklungsphasen described become per se

used known counter and rogler.

After the phase of increased vane speed, the vane speed delivery speed ratio changes as much as

It is usually provided by the technology.

The short - term changes in production conditions lead to barely noticeable restrictions Machine productivity.

Claims (2)

A method of manufacturing roving bobbins for the automatic feeding of reel bobbins on ring spinning machines, characterized in that the roving rotation is varied within a roving bobbin winding by optimizing the number of roving layers and the increased vane rotation speed by known counters and regulators in a microcomputer in that the roving receives an increased rotation of 10-30% over a certain number of roving layers. 2. Ancestors according to claim 1, characterized in that the roving at the coil start and at the coil end an increased rotation of 10-30% is granted. For this 1 page drawings Field of application of the invention The invention relates to a method for the production of roving bobbins, which are suitable for automatic loading of the creel of the ring spinning machine.
The method is used on roving machines. Characteristic of the known state of the art On roving the drive speed is known to be regulated by means of a central drive. The ratio of winglet speed delivery speed is not affected thereby, so that the Vorgarndrehungen always remain constant. Due to the separation of the central drive in group drives, as they emerge from the WP-DD 217832, influencing the above ratio has become possible. Since the withdrawal conditions for the roving are almost constant at the ring spinning machine, so far there was no reason to depart from a uniform over the entire process of roving bobbin Vorgarnddrehung. However, with the roving bobbins produced in the usual manner, an automatic change of the roving bobbins on the ring spinning machine is problematic. Object of the invention The aim of the invention is to avoid damage or tearing of the roving when using roving for the automatic roving bobbin change process. Explanation of the essence of the invention The invention has for its object to provide a method for producing roving, which allows for the roving bobbins on the ring spinning machine optimal deduction conditions and the roving thereby meets the extremely mechanical stresses. According to the invention, this is achieved by a method that the Vorgarndrehung varies within e Vorner Vorgarnspulenbewicklung by the number of Vorgarnlagen and the increased Flügcldrehzahl be optimized by per se known counters and regulators in a microcomputer so that the roving over a certain number of Vorgarnlagen an increased rotation of 10-30%. Ausfuhrungsbelsplel On the basis of an exemplary embodiment diagrams illustrating the invention will be described in more detail. Fig. 1: diagram with two Vorgarnddrehungswechsel in dependence dos the degree of coil filling Fig. 2: diagram with a single Vorgarnddrehungswechsel depending on the degree of coil filling In ring spinning machines equipped with an automatic roving feed, the running roving hoses are replaced by wound roving bobbins. This change process takes place without interrupting the spinning process. Here are the expiring and there; Neuo Vorgarnstück mechanically interconnected and shifted the Vorgarnhülse and the roving bobbin under normal process conditions several times in Vorgarnspulenwechselwagen, so that the roving is exposed during the bobbin changing operation increased mechanical stresses. The roving runs, for example, with a loop ven over 180 ° over rollers and edges, where it often comes to the rotation jam and the dynamics of the sliding movement of the coil within the bobbin wagon leads to longitudinal forces in the fiber structure, which have an overall tensile strength reduction. By rotational movements of the running Vorgarnhülse, which are in the nature of the exchange process, occasionally slip turns that lead to loss of rotation and the tensile strength reduction of the roving.