JPS5524672A - Size and right-angularity meter for sheet - Google Patents

Abstract

PURPOSE: To simultaneously measure the size and right-angularity of a sheet through a simple operation from the output of a detector by providing a guide, which is at a right angle while acting as a standard guide plane 32, such that one detector is movably arranged at the right angle corner and that one detector is movably arranged at each of the two longitudinal and transverse sides.

CONSTITUTION: There is erected on a surface 51 to e measured a guide 33 which is at a right angle while having a standard guide plane 32 and which is equipped with a detector 40 at its right angle corner and two slidable detectors 41 and 42 at the longitudinal and transverse sides. Along the guide 33, there is formed at a desired portion of the surface 51 a hole 34, through which the light of a projecting unit 31 is guided into the upper detector. The detector is equipped with two sensors 36 and 36' which receive through the hole 34 and light from the projecting unit 31 so that they generate outputs which are different in accordance with the standard plane when the sheet to be measured is pushed onto the guide plane 32. Moreover, the guide 33 is equipped with a paper holder 43 so that the sheet is accurately pushed onto the plant to be measured. Thus, the size and right-angularity of the sheet are simultaneously measured by the outputs of the detectors 40, 41 and 42 while moving the movable detectors 41 and 42.

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