Canon Kabushiki Kaisha

Masashi Kurihara

Kengo Nieda

Masato Izumi

Hiroyuki Kakishima

A decision is made for each page as to whether to allow image printing on that page, by comparing the remaining sheet length DL with a length of an image about to be printed, IL. A length of a non-printed, rear-end cut sheet is also checked to determine whether the non-printed cut sheet needs to be further cut into smaller sheets. This arrangement can prevent a complete image to be printed in one page from being broken and only partly printed in the last portion of a paper roll, ensure that printed cut sheets and non-printed cut sheets are stably conveyed and discharged and enable the non-printed cut sheets to be almost equal in size so that they can be properly accommodated in the associated tray.

Printing apparatus

An image forming apparatus includes a control unit arranged to control an image forming unit so as to form images based on image information and to form maintenance images for maintaining the image forming unit. The control unit is arranged to control the image forming unit so as to form images on the second side of the sheet after forming images on the first side of the sheet, and so as to form the maintenance images on the second side at positions such that the maintenance images do not overlap with the images based on the image information formed on the first side.

Image forming apparatus

The objective of the present invention is to solve a problem that a printing throughput is not improved so much in a conventional printing processing device arranged for example in a serial printer such as an ink-jet printer etc., due to a requirement to repeat printing in the main scanning direction and feeding a paper in the sub scanning direction, until a blank area where the printing is not allowed is confirmed in printing different data on respective discrete papers. To fulfill the objective a function to supply the succeeding paper while the current paper is held in the printer and means to change supplying conditions of the paper and to adjust overlapping extent of papers are arranged in a device where a print operation is executed by a combination of the printing in the main scanning direction and paper feeding in the sub scanning direction.

Print operation processing device for serial printer

The invention relates to communication processing system and communication processing method which can process data at a high speed by efficiently and smoothly executing data processings for transmission and reception. The system has small scale memory areas which are independent in layers and a large scale memory area which is common to the layers. Data of a small size is transferred to the small scale memory areas and the large scale memory area is released.

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Hiratsuka, Japan

Masashi Kurihara