| 摘要 |
PURPOSE:To improve operability and workability, and especially, to simplify a work at the time of setting a lot of originals of various sizes by screwing a pair of paper guides to a screw threaded to a common shaft, comparing the present position of a driving motor of the shaft with the target position, and rotating the driving motor forward or backward by that difference portion. CONSTITUTION:A count value corresponding to the present position of a pulse motor 6 is held in an up-down counter 12, and its count value is supplied to a comparator 11. In this comparator 11, a present position data of a pulse motor 6 supplied from the up-down counter 12 is compared with a target position data of the pulse motor supplied from an AND gate 8. A forward rotation signal (x) is outputted continuously from the comparator 11 until a data supplied to the comparator 11 from the up-down counter 12, namely, the present position data of the pulse motor 6 coincides with a data supplied from the AND gate 8, namely, the target position data of the pulse motor 6, and the pulse motor 6 is driven. |
