Canon Aptex

Canon Aptex Kabushiki Kaisha

Seiji Niida

Hideaki Kishida

Akira Katayama

Takefumi Tamura

Kimio Ebata

Katsuo Nakayama

The main controller of an ink-jet printer sets a read address in a driver controller to read out image data from an image memory which stores image data to be printed, in units of print lines. The driver controller reads out image data of one line from the image memory in accordance with the set address to print the image of one line, and conveys printing paper in synchronism with this printing. The main controller controls setting of the read address in the driver controller to execute magnification processing in the direction of conveyance on the basis of a set correction amount. When appropriate magnification processing is performed for print image data, any mechanical error of the conveyor mechanism is absorbed.

Printing apparatus and control method therefor

This invention not only separates printing and barcode checking as independent processes but also simplifies printer processing to allow to print a large number of barcodes at high speed and to satisfactorily check barcodes. For this purpose, when a print control circuit unit (501) receives print information including a barcode, information associated with barcode checking is transmitted to a barcode checker unit (601) prior to printing. Upon actually printing an image including a barcode, when the printed barcode is conveyed to the position of a reader (603) in the barcode checker unit (601), an RD.sub.-- TRG signal is output to check the printed barcode. Upon reception of this signal, the barcode checker unit (601) reads the printed barcode a plurality of number of times at different positions, and when the normal reading ratio is low, it outputs an error signal to the print control circuit unit (501).

Barcode printing system and its control method

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Fussa, Japan

Seiji Niida