| 摘要 |
A multiple magnification mode copying apparatus includes a full and half-rate scanning mirror system, the scanning system including a cable and a pulley arrangement for driving a full rate mirror carriage in a predetermined direction at a predetermined speed and for simultaneously driving a half-rate mirror carriage in the same direction at half the speed. The cable is driven by a capstan mounted on a drive shaft, and the drive shaft is rotated at a speed in accordance with the magnification mode by a multiple ratio gearing system. The apparatus also includes an optical sensor and a timing disc, the timing disc comprising a notched disc driven by the drive shaft, and the optical sensor being arranged to detect the masking or unmasking of a light source by the notches in the disc to provide signals that are used in controlling the copying apparatus.
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