Benninger Ag

Karl Mayer Textilmaschinen

Alfred Jakob

Andreas Kleiner

The invention relates to a yarn-tensioning device for producing a specific thread pull on a thread () that is unwound from a winding point () of a creel () and is guided to a warping machine arrangement (). Said yarn-tensioning device comprises a rotating body () which is at least partially wound round by threads and an electric motor () which is connected to the rotation body. Said motor () is equipped with at least one brake transistor () for discharging excess energy produced when the generator of the motor is operated, said brake transistor being able to convert generator energy, arising when the generator is operated, into heat.

Yarn-tensioning device and arrangement and method for operating a creel

The invention concerns a creel () comprising a plurality of winding heads () from which several yarns of the same type or of different types are drawn simultaneously by means of a winding machine (). Said creel comprises at least one dynamic yarn tension device () which is associated with each winding head and at which a variable braking force is applied to the yarn to produce a predetermined yarn tension. Each yarn tension device () can be activated by means of an associated drive motor (). Said creel () comprises a control device for controlling the yarn tension based on the angular speed or the yarn speed during a start-up and/or an interruption of the winding machine (), as well as a regulator () for regulating the yarn tension during the normal stationary phase of the winding machine (). The control device and the regulator () 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 () of the braking force required to control the yarn tension device (), a precompensation of the disturbing quantity is implemented. Said precompensation calculates from the yarn speed (v) as input quantity a compensated correction quantity () of at least the inertia of the motor and a friction coefficient of the drive motor ().

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Niederuzwil, Switzerland

Alfred Jakob