Maschinenfabrik Rieter Ag

Sulzer Brothers Limited

Kurt Salvisberg

Markus Erni

Kurt Schefer

Marcel Zund

An apparatus for controlling the effective length of thread wound into a thread package during a winding operation includes a sensor which senses the rotation of a driving roller that drives the package being wound and issues signals representative of the number of revolutions, a divider which divides such signals by a divisor that is selectively adjustable by a user, and a counting arrangement which compares the output of the divider with the desired length of the thread wound into the package as selectively set into the counting arrangement by the user. At least one thread package wound to an actual length with the divisor adjusted to a known value is unwound under conditions that are anticipated to exist during the unwinding of the package by the ultimate user, and the effective length of the unwound thread is measured. The measured value is then used for adjusting the divisor of the divider in the event that the measured effective length deviates from the desired effective length. The operation of the counting arrangement is interrupted when there is encountered a break in the thread being wound.

Method and apparatus for controlling the effective length of thread

An arrangement for evaluating the performance of a yarn processing machine including a plurality of yarn processing stations that are individually operatable and each of which includes a monitoring device for the operating conditions thereof and a yarn quality monitoring device capable of detecting yarn quality defects comprises data links which separately supply first signals from the condition monitoring devices and second signals from the yarn quality monitoring devices to an evaluation location. An associating device is situated at the evaluation location, being connected to the data links and operative for associating the second signals which are representative of quality defects with the associated yarn processing stations. The associating device includes two storage devices one of which stores data representative of random yarn breaks at the associated stations while the other stores data representative of quality defects at such stations, and there is further provided an arrangement for entering data into the storage devices in response to those of the second signals which are representative of defective yarn quality at the associated stations, and to those of the first signals which are representative of changes in the conditions of the associated stations that are indicative of yarn breaks at such stations.

Method and arrangement for evaluating the performance of a yarn

A filament winder of the automatic exchange type in which chucks are brought successively into winding positions relative to a friction drive roller and thread is transferred from a package on an outgoing chuck to a bobbin on an incoming chuck. Each chuck moves along its own predetermined path towards and away from the friction drive roller. A free thread length is created between the friction drive roller and the outgoing chuck and this free thread length is intercepted by thread catching means on the incoming chuck.

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Gachlingen, Switzerland

Kurt Salvisberg