Tohoku Ricoh Co., Ltd.

Ricoh Company, Ltd.

Canon Aptex

Tomoya Otomo

Mitsuo Sato

Kazuyosi Kobayasi

Toshiharu Hasegawa

Masayuki Shima

Hiromi Omura

Mitsuo Sate

Kazuyosi Kobayashi

A stencil printer includes an ink drum having a hollow cylindrical porous support and a pair of flanges supporting opposite ends of the support. Annular elastic members are respectively affixed between the inner periphery of the porous support and the outer circumferences of the flanges. When the ink drum is pressed against a press roller, the elastic members deform and cause an ink roller disposed in the ink drum to be displaced. As a result, the ink roller contacts the inner periphery of the porous support brought into contact with and positioned by the press roller. The ink roller and the inner periphery of the ink drum can therefore contact each other under uniform pressure without the rigidity of the drum being reduced and without any shaking.

Stencil printer

A stencil printer of the present invention is selectively operable in a simplex print mode or a duplex print mode and includes two drums. The drums each has a respective master support on its circumferential surface. The master supports of the two drums are movable into and out of contact with each other without the distance between the shafts of the drums being changed. In the duplex print mode, the master supports contact each other with the intermediary of a paper so as to print images on both sides of the paper at the same time. The printer obviates noise and insures high image quality.

A sorter having an intermediate transport device using a belt and for transporting printings to bins, and a transport speed control device for changing the transport speed depending on the size of the printings, and the type of the printings including thickness and quality, such that the transport device transports the printings at an optimal speed. The trailing edge portions of the printings are prevented from being left at the outside of the bins and causing jams and other troubles to occur.

Sorter for a stencil printer and paper transport speed control device

An image forming apparatus operable with a plurality of on-line sorters each having a plurality of bins, and a control device therefor are disclosed. A first sorter and a second sorter, for example, are linked to a stencil printer in an online configuration. A sorter to be used can be freely selected or can be automatically selected by the control device. A sorter link mode key is pressed in a particular manner to select one of a first sorfer priority mode, second sorter priority mode, first sorter only mode, and second sorter only mode. One of the first and second sorters is selected on the basis of the mode selected on the sorter link mode key.

Image forming apparatus with interconnected sorters and control device

A printer for printing a stencil image on a sheet is provided having a scraper which prevents ink from flowing axially outward beyond the ink supply roller. The scraper can be connected to a plate which supports the ink supply roller and preferably includes a portion extending toward and/or contacting the ink supply roller.

Ink scraper for a stencil printer

A printer for printing out an image formed in a stencil on a sheet. The stencil formed with perforations representative of an image is wrapped around a drum which is made up of a hollow cylindrical support and a mesh screen covering the support. The cylindrical support has an apertured portion and a non-apertured portion and accommodates an inking roller therein for supplying ink to a sheet via the stencil. The sheet is pressed against the stencil by a press roller that faces the inking roller with the intermediary of the drum. A high friction member is located at a predetermined position on the non-apertured portion of the drum or a predetermined position on the mesh screen corresponding to a position where the press roller begins to press a sheet against the stencil.

Stencil and screen assembly for a printer

A printer for printing out an image formed in a stencil on a sheet. The stencil formed with perforations representative of an image is wrapped around a drum which is made up of a hollow cylindrical support and a mesh screen covering the support. The cylindrical support has an apertured portion and a non-apertured portion and accommodates an inking roller therein for supplying ink to a sheet via the stencil. The sheet is pressed against the stencil by a press roller that faces the inking roller with the intermediary of the drum. The press roller is biassed by a cam having a profile such that the press roller contacts the drum before the sheet arrives between the press roller and the drum. The cam is also profiled such that the press roller gradually comes into contact with the drum to reduce oscillations between the press roller and the drum.

Stencil printer with a cam baissed press roller

A printer for printing out on image formed in a stencil on a sheet. The stencil formed with perforations representative of an image is wrapped around a drum which is made up of a hollow cylindrical support and a mesh screen covering the support. The cylindrical support has an apertured portion and a non-apertured portion and accommodates an inking roller therein for supplying ink to a sheet via the stencil. The sheet is pressed against the stencil by a press roller that faces the inking roller with the intermediary of the drum. A high friction member is located at a predetermined position on the non-apertured portion of the drum or a predetermined position on the mesh screen corresponding to a position where the press roller beings to press a sheet against the stencil.

Growing community of inventors

Sendai, Japan

Tomoya Otomo