| 摘要 |
PURPOSE:To take corresponding even when printing content changes at every one page by subjecting the data resulting from the OR of printing data to be printed and the image data of a memory medium itself preliminarily read by an image sensor and the image data actually printed and read by the image sensor to comparative operation to detect whether or not there is difference between both data. CONSTITUTION:At the time of initial feed, the image data corresponding to one page of printing paper 1 itself whose image is taken by an image sensor 3 is stored in a paper image data memory 8. When printing operation is started, the image data of actual printing taken by the image sensor 3 is successively transferred to a control part 12. The printing data corresponding to one page read from a printing data memory 9 and the paper image data of the printing paper 1 itself taken in from the paper image data memory 8 at the time of initial feed are successively transmitted to the control part 12. The printing data and the image data are superposed one upon another to take the OR of both data in the operation part 10 of the control part 12 and this OR data is collated with the image data of actual printing transmitted from the image sensor 3 in a bit unit and the exclusive OR of both data is taken to inspect the image data of actual printing and the printing data to be printed originally. |
