Iro Ab

Aktiebolaget Iro

Aros Electronics Ab

Jerker Hellstrom

Lars-Berno Fredriksson

Kurt A Jacobsson

Lars Helge Tholander

Bo Akerlind

Ake Alberyd

Controlling a high speed asynchronous motor in a weaving machine

Yarn storage and feed device utilizing correctional air jet nozzles

Opto-electronic detector apparatus

A device for surveying the insertion of a weft yarn in a shed of a jet loom, comprises an arrival sensor arranged at one end of said shed for detecting the arrival of weft yarn there. The arrival sensor and at least one yarn sensor are connected to a surveillance circuit measuring the period of time lapsed since releasing a stopping device and periodically correcting the measured period of time on the basis of the yarn sensor signal. The surveillance circuit only generates a signal indicating the completion of the weft yarn insertion if the following two conditions are simultaneously fulfilled: The measured period of time exceeds a predetermined period of time between 80% and 99.5% of the period of time required for a complete weft yarn insertion cycle, and the arrival sensor generates a signal representing the arrival of the weft yarn.

Device for surveying the insertion of a weft yarn

Yarn supply device group

The present invention provides a method and apparatus which enables thread to be wound onto the motor driven storage drum of a thread storage and feeding device for a thread processing machine strictly continuously and uniformly with the aim of ensuring that the thread as wound off the thread supply bobbin is wound onto the storage drum in such a way that variations in the tension of the thread as pulled off the storage drum are eliminated. This is achieved by controlling the number of revolutions of the motor in response to a control signal which is derived from the thread intermediate supply on the drum and the actual thread consumption, i.e., the average speed of the thread leaving the drum.

Method and apparatus for controlling a thread storage and feeder device

Growing community of inventors

Nol, Sweden

Jerker Hellstrom