| 摘要 |
An electrophotographic digital copier for sequentially writing bicolor image data signals onto a photoconductive element and producing a bicolor hard copy by a single image transfer. The copier has a black developing device and a red developing device for developing respectively a latent image electrostatically formed by a black image data signal on a photoconductive element and a latent image electrostatically formed by a red image data signal. A signal detecting device determines whether or not the red image data is present. A control device starts the drive of the red developing device when the signal detecting device detects the red image data signal and ends the drive on upon the elapse of a predetermined period of time after the signal detecting device determines, during the driving of the red developing device that the red image data signal is absent.
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