Sharp Kabushiki Kaisha Corporation

Koji Wakamoto

Junya Masuda

Hiroshi Kida

Tatsuya Inoue

Shinji Nakazawa

Shinichi Takeda

Masao Matsui

Norio Tomita

Masaru Tsuji

Takahiro Fukunaga

Yasuaki Fukada

Tadasu Taniguchi

Masanobu Yamamoto

Atsushi Ogo

Hidetoshi Atsumi

Ryosuke Sakai

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

A switch back path is connected to a sheet feed path through a branch portion. A plurality of pairs of forward and backward rotating rollers are disposed along the switch back path from the branch portion. A driving portion selectively supplies rotation of a forward rotation direction or of a backward rotation direction to a plurality of pairs of forward and backward rotating rollers. A separation mechanism separates a first pair of forward and backward rotating rollers from each other. A control portion controls operation of the driving portion and the separation mechanism so that a sheet to be fed into the switch back path and a sheet to be fed out of the switch back path pass each other in the switch back path.

Sheet feeder

There are provided a conveying path provided in an apparatus body and serving to convey a sheet-like object in a longitudinal direction, a moving body capable of being moved to a position in which the conveying path is to be exposed and a position in which the sheet-like object can be conveyed to cover the conveying path, and at least three support members for supporting the moving body to be slid in an almost horizontal direction with respect to the apparatus body and to be separated or joined are provided on a lower end portion at the side that a user accesses for a jam processing in the moving body and both upper and lower end portions at the opposite side thereof. Accordingly, in the case in which the user is to carry out the jam processing by separating the moving body from the apparatus body, a jammed paper in the conveying path can be removed easily.

Sheet-like object conveying apparatus with movable body exposing a conveying path

Sheet-like object conveying apparatus

In an image forming apparatus for reproducing an image on an image carrier by means of a laser beam, a frame structure for supporting a laser scanning device has a basic configuration in which lower portions of front and rear frames are coupled to each other by combining square pipes. In the frame structure, a reinforcing member of a flat plate made of a rigid material is fixed to upper square pipes of the front and rear frames which is required to be reinforced. A supporting member which supports optical components constituting the laser scanning device is fixed and supported by the reinforcing member.

Image forming apparatus

A sheet post-processing apparatus having a post-processing tray arranged upright, a post-processing device such as stapler etc., an offset tray to which post-processed sheets are discharged, includes: the third and forth discharge rollers for introducing the sheet into the post-processing tray from its bottom and discharging the sheet after post-processing to the offset tray; a sheet guide arranged opposing the post-processing tray, a pusher mechanism and paddlers, for aligning the sheets to be stacked so as to be substantially upright and pressing the sheet by particular portions when the sheet is introduced into the post-processing.

Sheet post-processing apparatus

Growing community of inventors

Nara, Japan

Koji Wakamoto