ELEKTRONISK APPARAT TIL AUTOMATISK OG TRINLOES INDSTILLING AF OPSKAERINGSHOEJDEN FOR TEKSTILARTIKLER MED FORSKELLIG TYKKELSE OGSAA I NAERHEDEN AF SAMMENSYNINGER

A device is described which permits automatic, uniform, and precise shearing of cloth pieces, including those areas near the seams, and which thus minimizes the economic loss due to non-sheared areas of cloth. The device employs the logic processing of information continuously delivered by a detector which measures the thickness of the cloth at a point before it reaches the shearing cylinder. This information is processed in an electronic system so as to adjust properly the width of the shearing slit in synchronism with the movement of the cloth. By the technique described herein, spurious signals of thickness information caused by the presence of a seam are discarded and replaced by certain fictitious signals that will bring about the desired height of pile in the sheared cloth in the areas near the seams, while nevertheless permitting the seam to pass through the shearing slit.