Gebruder Loepfe Ag

Gebrueder Loepfe Ag

Other

Loepfe Brothers Limited

Erich Loepfe

Erich Weidmann

Fritz Stahlecker

Walter Schumperli

Walter Graf

The electronic weft stop motion is designed for monitoring the weft thread in a last phase immediately following the weft insertion into the weaving shed when a thread tensioning device located on the picking side of the machine laterally deflects the weft or filling thread and thus holds it tensioned. A tactile thread sensor is arranged in the region of the lateral deflection of the weft thread in such a manner that the thread sensor goes free from the weft thread in the undeflected condition thereof, however is frictionally contacted by the weft thread when the latter is being laterally deflected.

Electronic weft stop motion on a gripper shuttle weaving machine

An electronic circuitry for evaluating electrical sensing signals furnished by a sensing device responsive to ballooning motion of a yarn in a textile machine and delivering a series of high frequency pulses having a repetition rate corresponding to the low frequency of the ballooning motion, comprises a series arrangement of an A.C.-amplifier, a rectifier, a low-pass filter having an upper cut-off frequency smaller than said high frequency but greater than the low frequency of the ballooning motion, and a frequency discriminator made up of a high-pass filter and integrator, and a final stage to either indicate improper yarn ballooning or disable the machine operation.

Device for monitoring yarn motion on a textile machine

At each work position of a textile machine having a plurality of work positions driven by a common drive unit (warper's creels, winder or spooling and spinning machines, or circular knitting machines, for example), an electronic monitor device is provided which is responsive to thread travel. An indicator device is associated with each travel monitor and comprises a storage element and an indicator connected thereto, for the permanent indication of a thread breakage. To prevent false indications of thread breakage when the machine is stopped, a control signal is generated when the machine's drive unit is operating. Each indicator device further includes an electronic switch responsive to the control signal to insure the storage unit can be set to indicate a thread breakage only during operation of the drive unit.

Electronic device for monitoring a plurality of running threads on a

A sensing device responsive to ballooning motion of textile yarns, and producing electrical sensing signals comprising a hollow or ring-shaped yarn guide body whose interior periphery is provided with motion responsive and non-responsive elements in alternate sequence.

The invention is concerned with an electronic weft or filling thread monitoring device on a gripper shuttle weaving machine provided with means for moving the gripper shuttle, at the end of the shuttle insertion, back from a stop position to a yarn releasing position, and simultaneously tensioning the thread. The monitoring device comprises thread sensing means responsive to thread travel as well as to thread tensioning and provides machine stopping signals when neither continuous thread travel nor thread tensioning occurs in predetermined, machine-controlled monitoring intervals.

Electronic thread monitoring device for gripper shuttle weaving machines

Open-end spinning machine apparatus is provided which includes a yarn measuring device at each of the individual spinning units for determining the transverse dimension of the running yarn produced at the spinning units. In addition, intermediate storage means are provided for electronically storing yarn measurement data at each of the individual spinning units. In order to process the yarn measurement data, a process computer is provided at a mobile servicing instrument which is selectively movable to respective servicing positions at the spinning units. The process computer and mobile servicing instrument also includes means for carrying out servicing operations at the respective spinning units in the event of detected yarn flaws or the like. By providing the process computer at the mobile servicing unit, with individual separate intermediate storage systems at each spinning unit, the total cost for electronic equipment is substantially minimized while obtaining all of the advantages of a complete computerized analysis system. According to certain preferred embodiments the circuitry at the individual spinning units is designed to store data as to periodic yarn defects leading to a moire appearance. In other preferred embodiments, the circuitry at the spinning units is designed to provide data storage indicating deviations of the yarn dimensioned from predetermined minimum and maximum standards.

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Pfaffhausen, Switzerland

Erich Loepfe