Hitachi Koki Co., Ltd.

Mitsuaki Hayakawa

Hiroyoshi Tokoro

Tsuneki Kobayashi

Kensei Hosoya

Kazuo Sugano

Shogo Nobumori

Kiyoo Kawate

A mechanism for preventing the skew of a cut paper sheet, for use in a duplex printing machine or a paper reversing mechanism having a switchback mechanism for switching the cut sheet backward from its trailing end by reverse rollers and so on immediately after the cut sheet subjected to the printing at a printing portion is once discharged onto a reverse plate by paper discharge rollers and so on, the mechanism comprising: a plurality of paper guides formed on a surface of the reverse plate of the switchback mechanism so as to limit the lateral movement of the cut sheets of several kinds in the direction of the width thereof, the paper guides being arranged in a manner to correspond respectively to the widths of the cut sheets of several kinds to be discharged onto the reverse plate, the distance between each two paper guides for guiding a respective one of the cut sheets being slightly greater than the width of the corresponding cut sheet, and the paper guide for guiding the wider cut sheet being higher than the paper guide for guiding the narrower cut sheet, whereby each of the cut sheets discharged onto the reverse plate is guided by the corresponding paper guides according to the size of the cut sheet, and is switched backward, thereby preventing the skew of the cut sheet.

Mechanism for preventing skew of cut paper sheet

A cleaner for a toner fixing device in an electrophotographic machine or the like. A housing is provided near a pair of fixing rollers, and an endless-belt type felt member is partially disposed in the housing in a folded state. The remaining portion of the felt extends outside of the housing and contacts one of the fixing rollers while the felt is being pressed upon by a drive roller and pressure member. The felt is moved at a slow speed, preferably such that its service life corresponds to one rotation of the felt.

Cleaner for toner fixing device

In a perfecting printing machine, a switch-back mechanism moves backwardly each sheet delivered out of the printing section, and a switching gate provided immediately after the switch-back mechanism selects a first sheet path to return the sheet whose one side has been printed to the printing section and a second sheet path so that the sheet whose both sides have been printed is delivered to the stacker after being moved backwardly by the switch-back mechanism.

Growing community of inventors

Ibaraki, Japan

Mitsuaki Hayakawa