Method and arrangement for limiting the loom shed opening angle

摘要

A method and a device limit the normal shed opening angle (alpha) of warp threads in an open loom shed, to a smaller limited shed opening angle (alpha1) that applies to the selvedge warp threads over a selvedge laying-in width at the edge of the fabric. The limited shed opening angle (alpha1) is smaller than the normal shed opening angle (alpha) and is selected to provide optimal positioning and binding-in of the free thread end of a beat-up weft thread that is guided back and laid or tucked into the next open shed to form a high quality laid-in selvedge. The shed opening limit device includes two thread-constraining prongs that extend perpendicularly to the direction of the warp threads at least along the desired laid-in depth of the selvedge. The selvedge warp threads are guided and constrained between the prongs so that the extent of shed opening of the selvedge warp threads is limited to the limited angle (alpha1).