Importance

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Abstract

An image duplicating apparatus has a mode of copying operation of two consecutive cycles and includes an image duplicator module for reproducing on a copying sheet a visible image duplicated from an original image on a document sheet. A document feed module for automatically feeding a document sheet to and from a position enabling the image duplicator module to reproduce the visible image on a copying sheet is included as is a paper recirculation unit for receiving from the image duplicator module the copying sheet on which the visible image has been reproduced during an earlier cycle of copying operation. The paper recirculation unit is operative to recirculate the copying sheet towards the image duplicator module during the later cycle of copying operation. Any difference is detected between the number of copying sheets received by the paper recirculation unit during the earlier cycle of copying operation and the number of copying sheets recirculated from the paper recirculation unit during the latter cycle of copying operation so as to produce a signal when the difference is detected upon completion of two consecutive cycles of copying operation. In response to such a signal, the document feed module may be disabled from feeding a document sheet to the position enabling the image duplicator module to reproduce the visible image on a copying sheet.

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First Claim