Patent ID: 8355143

Claim:
A continuous paper duplex printer comprising: a front surface image processing apparatus that performs image processing of image data for printing on a front surface of continuous paper; a back surface image processing apparatus that performs image processing of image data for printing on a back surface of the continuous paper; a printer controller that converts print data into image data per page, during duplex printing, transmits image data for an odd-numbered page to the front surface image processing apparatus, and transmits image data for an even-numbered page to the back surface image processing apparatus; and a printing engine that forms an image for an odd-numbered page on a front of the continuous paper and that forms an image for an even-numbered page different from an even-numbered page subsequent to the odd-numbered page being in printing on a back of the continuous paper in parallel with image formation of the image data for an odd-numbered page, based on the image data subjected to the image processing performed by the front surface image processing apparatus and the image data subjected to the image processing performed by the back surface image processing apparatus, wherein during single sided printing: when the printer controller transmits the image data for an odd-numbered page to the front surface image processing apparatus, the printer controller transmits blank page image data or a blank page instruction to the back surface image processing apparatus, and when the printer controller transmits the image data for an even-numbered page to the back surface image processing apparatus, the printer controller transmits blank page image data or a blank page instruction to the front surface image processing apparatus.