Hitachi Koki Co., Ltd.

Hitachi, Ltd.

Ricoh Company, Ltd.

Hitachi Printing Solutions, Ltd.

Kazutoshi Obara

Kenichi Ito

Yasuyuki Tsuji

Yoshihiko Sano

Takeshi Terakado

Masaru Kawamoto

Minoru Ohshima

Susumu Saitoh

Akira Arimoto

Kiyoshi Suzuki

Takeshi Mochizuki

Hiroyuki Mabuchi

Makoto Nakura

Hisao Okada

Seiji Maruo

Satoshi Ueda

Masuo Kasai

Minoru Seino

Noritaka Masuda

Osamu Namikawa

Sadanori Kobashi

Shuichi Morio

Masami Ishikawa

Masakazu Nemoto

Tsukasa Ogawa

Yoshinori Kawaai

Kenichi Kamoshida

An image forming system includes an image forming unit configured to output image data onto a recording medium; a first conveying unit configured to convey the medium; a reading unit configured to read an image from the medium; a defect determining unit configured to determine whether the read image has a defect; a device connection determining unit configured to determine whether a discharge device is directly connected to an image inspection device at the downstream side or is connected to the image inspection device via another device at the downstream side; a second conveying unit configured to convey the medium to the discharge device on a longer conveying path, when the discharge device is directly connected to the image inspection device; a defective discharge tray to which the medium having a defective image is discharged; and a normal discharge tray to which the medium having a non-defective image is discharged.

Image forming system with an image inspection device

In an electrophotographic printing apparatus for printing an image to an image transfer sheet medium by producing a latent image on a photosensitive unit and transferring the latent image to the image transfer sheet medium, a width-directional position of the image transfer sheet medium is detected before the latent image is produced and the same after the latent image is produced on the photosensitive unit by the width-directional positional sensor, and the detection results are compared with one another; and it is determined from the comparison result whether or not printing operation is continued.

Electrophotographic printing apparatus and printing system

A laser control device includes a light amount varying section for varying the light exposure amount at plural levels is provided with a correction section for correcting the difference between the times to the peaks of laser outputs of print signals input to a laser control circuit. The turning on time of each print signal is corrected, whereby the difference between the times to the peaks of laser outputs of the print signals different in light exposure amount can be eliminated for correcting the difference between image print positions.

Laser control device

In the tri-level process in which positive and negative latent images are formed on a photosensitive body and then developed using toners of two colors (for example, red and black) charged respectively to opposite polarities with respect to the polarities of the latent images, there has been a problem of degrading the quality of a two-color picture by the appearance of a special phenomenon in which red toner is attached around a black image and black toner is attached around a red image by attraction of the reverse electric field. An exposure control is performed in order to suppress the fringe phenomenon.

Light exposure controlling method of electrophotographic apparatus for

A printed paper sheet, on which plural pages of image are formed, is cut by detecting the position of conveying, the dimension of paper width and the amount of skew of the printed paper sheet, and by controlling the position of a slitter for cutting the printed paper sheet based on the detected result. The plural sheets of the cut printed paper sheets are divided so as to pass through plural routes to pile them in order of page.

Printing apparatus with movable slitter for printed paper sheet

An image forming apparatus for forming images of plurality of pages on one cut sheet, includes: a sheet cutting mechanism for cutting a cut sheet on which images of a plurality of pages have been formed into smaller sheets the number of which corresponds to the number of the pages; a sheet arranging mechanism for arranging the smaller sheets thus provided; and a sheet stacking mechanism for stacking the smaller sheets thus arranged. Hence, it is unnecessary for the apparatus to have a sheet post-processing apparatus.

Image forming apparatus and sheet arranging method for the apparatus

A beam position control apparatus in which a light beam is led into a light detector from a light generating source through a movable reflector and positioning of the light beam is performed by a servo control circuit for feeding a signal from the light detector back to the movable reflector, comprises: an oscillator for oscillating in response to an initializing signal and moving the movable reflector to move the beam onto the light detector; and a control switch for separating the oscillator and the movable reflector from each other in response to the signal from the light detector, the oscillator and the control switch being arranged in the servo control circuit.

Beam position control apparatus

A double beam scan type optical apparatus for use in a laser printer or the like. Such apparatus comprises two light sources and a lens system which provide scanning means for scanning a surface with parallel output light beams of the two light sources and beam distance controlling means for controlling the distance between the light beams. The reliability of the invention is improved by monitoring the intensity of the beams. Beam intensity checking means provide signals to verify that the intensity of each beam is maintained equal thus assuring that no abnormal conditions exist with the light sources or the lens system of the apparatus.

Double beam scan type optical apparatus

Growing community of inventors

Ibaraki, Japan

Kazutoshi Obara