Image forming apparatus.

摘要

An image forming apparatus comprising: a rotating section of a rotatable cassette movable between a longitudinal feed position from which paper longitudinally oriented with respect to a feeding direction is fed and a lateral feed position from which paper laterally oriented with respect to the feeding direction is fed, the rotating section being driven by a driving motor; a document size detection device for detecting the size and orientation of a document; an automatic paper selection function for selecting a cassette which stores appropriate copy paper to be fed, in accordance with document size/orientation data obtained from the document size detection device and magnification data; a timer for measuring a predetermined period of time; a RAM for storing the document size/orientation data; and control means for (i) controlling the timer to start its measuring operation upon detection of a document size/orientation by the document size detection device, (ii) controlling the driving motor to move the rotating section of the rotatable cassette to either of the longitudinal and lateral feed positions which corresponds to a determined orientation of the copy paper if the copy material orientation changing means is selected by the automatic paper selection function, and there occurs no change in the document size/orientation data sent from the document size detection device to the RAM before the completion of the measuring operation by the timer, and renewing the document size/orientation data stored in the RAM and restarting the measuring operation of the timer if the document size/orientation data have been changed before the completion of the first set measuring operation of the timer. With the above arrangement, even if there occurs a change in the document size/orientation data due to a detection error etc. within a predetermined time period, the rotating section of the rotatable cassette can be set in a desired feed position without undesirable rotations.