| 摘要 |
PURPOSE:To control the replenishment of a development replenisher under the same conditions by providing a difference detecting means which compares the 1st signal and the 2nd signal and outputs the differential signal thereof, collating the differential signal with the predetermined value and discriminating the deterioration of a developing soln. CONSTITUTION:The output terminals of the 1st and 2nd impedance meters 18 and 21 are connected to the input terminal of an arithmetic circuit 22 which calculates the difference between the outputs of the meters 18, 21 and outputs the ohmic differential signal. The output terminal of the circuit 22 is connected to the input terminal of a discrimination circuit 23 which discriminates the deterioration or not of the developing soln. by collecting the differential signal with the prescribed value. The circuit 23 outputs the deterioration signal to a driving circuit 14 to drive a pump 13 for the specified time by the circuit 14 and to replenish the developing soln. with the development replenisher when said circuit discriminates the deterioration of the developing soln. The development replenisher is thereby stably replenished without being affected by the width and image area of a photosensitive plate, the amt. of the developing soln. and the carbon dioxide concn. in air. |
