Riso Kagaku Corporation

Yoshifumi Noguchi

Masashi Hara

Yoshiyuki Okada

Masakazu Kawano

Xiong Jianmin

Akira Ikezawa

Akio Kobayashi

A controller, upon occurrence of a sheet jam in a downstream conveyor, discharges a sheet in an upstream conveyor from a discharge port by controlling an operation of a switchback roller depending on an operation status of the switchback roller at a time of the occurrence of the sheet jam and then stops sheet conveyance by a conveyor.

Conveying apparatus

A sheet discharger includes: an accommodator configured to accommodate sheets; a conveyor configured to convey and discharge a sheet to the accommodator; a detector configured to detect whether a jam of a sheet has occurred in the accommodator and a state of the jam; and a controller configured to control the conveyor to continue sheet discharge upon detection by the detector of the jam in a state where sheet discharge of a jammed sheet is possible.

Sheet discharger

In execution of aligning operation in a paper discharge device, every time the number of discharged print sheets reaches the number of aligning-start print sheets, a control unit performs aligning operation while the unit intermittently drives paper feed rollers of an image forming apparatus, to prevent discharge of a print-completed print sheet to a paper discharge table during aligning operation. Further, the control unit intermittently drives an elevation unit such that the print sheet on the top of a paper discharge table is always lower than a paper discharge position of a pair of paper discharge rollers. In execution of high-speed and high-volume printing, it is possible to perform alignment of the print sheet discharged on the paper discharge table without reducing productivity.

Image forming system

An image signal read out from an original is binary-coded on the basis of a binary-coding threshold value. The binary-coding threshold value is calculated by making a histogram representing a frequency distribution of tones of the image signal, calculating the value of a peak tone at which the frequency is maximized, calculating as a first tone at which the frequency becomes equal to a predetermined level on the lower tone side of the peak tone, calculating a reference binary-coding threshold value by adding to the peak tone the difference between the first tone and the peak tone, and determining the binary-coding threshold value on the basis of the reference binary-coding threshold value.

Method of and apparatus for calculating binary-coding threshold value

A stencil printing apparatus is provided, which comprises a pressure chamber having a first wall and a second wall both of which face each other and are built up together via a frame-like packing, said first wall comprising a frame member which has flexibility in all directions and on which a diaphragm having flexibility is extended; means for supporting a stencil so as to have the stencil disposed opposite to said diaphragm in the pressure chamber; means for supporting printing paper so as to have the printing paper disposed between the stencil and the second wall in the pressure chamber, and means for reducing pressure in the pressure chamber. The diaphragm may be extended on the frame member by laminating it onto the frame member, and the packing and the means for supporting a stencil may be installed on part of said diaphragm overlapping with the frame member. The means for supporting a stencil may be a pair of fabric fastener, one half of the pair being fixed to the frame member.

Growing community of inventors

Ibaraki, Japan

Yoshifumi Noguchi