Sharp Kabushiki Kaisha Corporation

Ryosuke Sakai

Norio Tomita

Hiroshi Nakatani

Kyosuke Taka

Kohichi Yamauchi

Takumi Mori

Yasuaki Fukada

Atsushi Ogo

Koji Wakamoto

Hidetoshi Atsumi

The image forming apparatus includes: a paper feed unit; a print unit; a registration roller; a sheet leading end sensor provided downstream, in a transport direction of the recording paper, of the registration roller; a time measuring unit for measuring a time from a start point of transportation of the recording paper by the registration roller to a point of detection of the leading end of the recording paper by the sheet leading end sensor; a memory unit for storing a reference image forming time and a reference time; a print control unit; and an arithmetic unit for obtaining a difference between the reference time and the time detected by the time measuring unit. The print control unit adjusts the length of the image forming period in accordance with the adjusted image forming time determined based on the difference obtained by the arithmetic unit and the reference image forming time.

Image forming apparatus capable of adjusting print position of image on recording paper

An image forming apparatus includes a coating portion configured to perform a coating process that forms a coating film on a recording sheet with an image formed thereon, a main transport path configured to transport the recording sheet with the image formed thereon and to have a branching portion formed thereon, and a sub transport path configured to be once branched from the main transport path at the branching portion and to be returned to the main transport path again. The coating portion is disposed on the sub transport path.

Image forming apparatus, processing unit, and image forming method

An image forming apparatus includes a registration roller configured to adjust a starting time point of conveying a paper sheet; a printing unit configured to form a color image or a monochrome image on a photosensitive drum, and transfer the image to the paper sheet at a downstream side with respect to the registration roller in a conveyance direction to print; a line sensor configured to detect a conveyance position at an upstream side with respect to the printing unit in the conveyance direction; and a control unit configured to obtain a displacement amount with respect to a preset reference position based on the conveyance position, correct an image formation position according to the displacement amount to correct a printing position on the paper sheet, and change a correction method for the printing position according to whether any of the color image and the monochrome image is formed.

Image forming apparatus

An image forming apparatus includes an image forming portion that forms an image on a recording sheet, a transport path that transports the recording sheet with the image formed thereon by the image forming portion, a coating portion that performs a coating process that forms a coating film on the recording sheet that is being transported on the transport path, and a reading portion that reads a calibration chart on the recording sheet that is being transported on the transport path. The coating portion is disposed on the upstream side in a recording sheet transport direction of the reading portion on the transport path, a calibration process is performed for an image formed by the image forming portion, and the calibration chart is formed on the recording sheet by the image forming portion in order to perform the calibration process.

Growing community of inventors

Osaka, Japan

Ryosuke Sakai