Copying machine with registration adjusting device

Claim 1

A copying apparatus comprising: (a) a platen on which an original document is placed, an image of which is optically read and then processed being formed on an image carrier; (b) at least one sheet feeding cassette for storing recording sheets thereon; (c) a sheet feeder provided on said cassette for feeding recording sheets one by one toward said image carrier to transfer the processed image which has been formed on said image carrier on recording sheet; and (d) registering means for conveying the recording sheet fed by said feeder, for temporarily stopping the fed recording sheet in timed relation with the processed image on said image carrier, and for registering the processed image and the fed recording sheet; wherein each value of a period of time corresponding to a temporary stop of the recording sheets at said registering means fed by each cassette is used to calculate a mean value; and, upon comparing the calculated mean value with a predetermined reference value, a sheet feeding timing by said sheet feeder being advanced according to the comparison.