Miyakoshi Printing Machinery Co., Ltd.

Osamu Ebuchi

Hideo Izawa

Yasushi Katagiri

To provide a printing method capable of inhibiting a paper sheet from being damaged at the time of conveyance and efficiently starting reprinting with high positional accuracy after printing is once stopped. The present invention is directed to a printing method of printing a unit image G by a printing partbased on detection of a reference punched holeof a hole detection sensorto form a print portion P, then stopping printing to form a non-print portion P, then by a mark detection sensordetecting a register mark G, recognizing a boundary between the print portion Pand the non-print portion P, and reprinting the unit image G from the non-print portion Pbased on detection of the reference punched holeby the hole detection sensor

Printing method

A method of correcting print images in an electrophotographic printer wherein an image formed by a print head () on a peripheral surface of a photoconductor drum () is transferred and printed on a sheet of paper. The method comprises: furnishing the print head with a standard tacho signal in the form of pulses and thereby printing on a sheet of paper a check mark () for each given number of pulses of the standard tacho signal while the photoconductor drum makes one rotation; by means of a camera (), detecting a periodic deviation in each spacing between successive such check marks; in response to the deviation in each spacing between the successive check marks, varying the pulse width of pulses of the standard tacho signal for each spacing between the successive check marks, thereby to provide a modified tacho signal; and effecting printing thereafter based on the modified tacho signal.

Method and apparatus for correcting print images in an electrophotographic printer

A electronic photograph printer includes a density-measurement section and a density controller section. The density-measurement section includes a density sensorfor measuring densities of images printed on a web by electronic-photograph-printing units. The density controller section adjusts densities of images which are about to be printed on the web by the electronic-photograph-printing units based on measurement data obtained by using the density sensorassociated with the densities of the image on the web. This configuration enables accurate and stable print-density control at a low cost.

Growing community of inventors

Narashino, Japan

Osamu Ebuchi