| 摘要 |
PURPOSE:To enable an overlap to be detected regardless of the kind of forms (material and thickness) and also enable the overlap, which occurs for the first time though, to be positively detected by arranging a thickness detecting sensors at the form passage allowing the detected thickness to be stored one after another so as to to be processed by means of a comparison means. CONSTITUTION:Sensors 34 and 35 are arranged in front of a register roller to detect the thickness of a form in such a way that they hold a form passage from the both sides. A light passing hole 37 is arranged on an upper and a lower guide plates 36 which guide the form 18 allowing a light receiving element 35 to receive light from a light sourse lamp 34. The light receiving element 35 allows its electric resistance to vary with the amount of light received. Accordingly, electric current which flows the light receiving element 35 varies with the amount of light which penetrates the form 18, allowing electric potential at a point A to be a value that corresponds to the thickness of the form. And the thickness tN of the form (thickness of the Nth form) is stored in a memory whenever the form passes through a thickness detecting unit. In case that N is 1, the thickness is stored as tmin. And the thickness TN detected in the form which comes from the second form, is compared with tmin allowing any overlap to be detected. Even if the first form causes overlapping, it is detected. And even if the first form overlaps with the second one each other, the overlap is definitely detected.
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