Distorted texture detecting method

Abstract

Abstract The invention relates to a method for detecting continuously the direction of the weft threads in a moving woven material. A plurality of unit slits (at least three), hereinafter referred to as a "divided slit arrangement," is provided, the plurality of unit slits having a pitch substantially the same as that of the weft threads. The divided slit arrangement is disposed adjacent to the woven material which moves traversely between a light source and at least three unit weft thread detectors. Each detector comprises an alignment slit and a transducer, and is designed so that a moire (generated by light passing through the divided slit arrangement and the weft threads of the woven material), as transmitted through a condensing lens and the alignment slit to the transducer, is converted to an electric signal. The alignment slits are arranged in correspondence to the preset angles of inclination of the respective unit slits which are deviated, for each detector, by suitable angles from the direction of the weft threads in a normal woven material. The output signals of the unit weft thread detectors are electrically scanned to obtain respective output voltages proportional to the light incident on each detector. Then, the detector having the maximum voltage is selected so as to identify, by means of the preset angle of inclination corresponding to a given alignment slit, the angle of inclination of the weft threads.

Inventors

• 👤 Ryoichi Shimada

Bibliographic Details