Method and arrangement for operating a creel for a winding machine and creel

Abstract

The invention concerns a creel (2) comprising a plurality of winding heads (7) from which several yarns of the same type or of different types are drawn simultaneously by means of a winding machine (3). Said creel comprises at least one dynamic yarn tension device (6) which is associated with each winding head and at which a variable braking force is applied to the yarn to produce a predeterminedyarn tension. Each yarn tension device (6) can be activated by means of an associated drive motor (20). Said creel (2) comprises a control device for controlling the yarn tension based on the angularspeed or the yarn speed during a start-up and / or an interruption of the winding machine (3), as well as a regulator (25) for regulating the yarn tension during the normal stationary phase of the winding machine (3). The control device and the regulator (25) are designed such that the yarn tension or the output tension of each yarn can be maintained at a substantially constant level relative to a setpoint value. In order to determine a quantity of regulation (32) of the braking force required to control the yarn tension device (6), a precompensation of the disturbing quantity is implemented. Said precompensation calculates from the yarn speed (v) as input quantity a compensated correction quantity (34) of at least the inertia of the motor and a friction coefficient of the drive motor (20).

Description

technical field [0001] The invention relates to a method and device for operating a creel of a winding plant and a creel, wherein a winding machine rotating at an angular velocity jointly draws a plurality of yarns of the same type or different types from a plurality of bobbin positions of the creel. At each bobbin position, the yarn is subjected to a variable braking force by means of at least one yarn tensioner to generate a certain yarn tension, which is driven by its associated drive motor. With this method, the aim is to obtain the best possible tension balance for all yarns on the creel, since the different yarn run lengths and the associated yarn paths between the bobbin position and the winding machine are in the Failure to adjust accordingly will result in different yarn tensions and the result will be uneven package densities. Background technique [0002] Creel operating methods are known in which the yarn tension of each yarn is kept as close to a constant nomin...

AI Technical Summary

Problems solved by technology

But in other working conditions, especially in the process of accelerating or stopping, this adjustment is usually impossible

Especially for winding installations with long yarns between the creel and the winding machine, the operation of this method proves to be difficult

For fast processes, especially when the winding machine is accelerated or stopped, long yarns may vibrate due to rapid tension adjustment during yarn tension adjustment

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