Loepfe Brothers Limited

Gebruder Loepfe Ag

Walter Schumperli

Erich Weidmann

Erich Loepfe

In order to monitor the correct receiving of an inserted weft yarn by a gripper in a receiving unit of a shuttleless weaving loom a detector is provided which is stationary mounted on the receiving side in an interspace between said gripper and a slay bar or reed of said weaving loom. Said detector comprises a plate-member projecting into said interspace or gap and having an inclined flank which is contacted by the weft yarn on his path between the inserting position and the beaten-up position. The passing of the weft yarn over this flank is detected by measuring potential variations in the detector during a defined phase of the machine cycle.

Weft yarn detector for a shuttleless weaving loom

An inductive projectile sensor on a gripper shuttle weaving machine or loom comprises a flat induction coil surrounding at least one of the guide teeth which are mounted on the lathe beam of the weaving machine to form a guide duct for the projectile when passing through the weaving shed. Means for magnetizing the guide tooth or teeth, such as a permanently magnetized small plate or lamella, are provided beneath the induction coil to form a magnetic core or bridge between two neighboring guide teeth, one of which is surrounded by the induction coil.

Electronic control device on a gripper shuttle weaving machine

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.

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Wetzikon, Switzerland

Walter Schumperli