Photocopying – Contact printing – Light boxes
Patent
1993-11-02
1996-07-23
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
355271, 355309, G03G 1520
Patent
active
055395090
ABSTRACT:
Sheet transportation apparatus operating in an image forming system for xerographic printing employing magnetic toner. The inventive features of the sheet processing apparatus are directed toward smooth transportation and discharge of printing sheets sent through a system image printing unit, across a sheet transport guide, and through an image fixing and sheet transporting unit which finally discharges the printing sheets. The sheet transport guide dips downward and meets a sheet admission guide, having superficial resistivity lower than that of the sheet transport guide to reduce electrical repulsion of the leading edge of a transported sheet. The sheet admission guide guides each sheet into a nipping position of a heating/pressure roller pair as fixing rollers in the image fixing unit. The heating roller heater is designed to promote even heat emission axially along the cylindrical surface of the heating roller, counteracting unidirectional flow of cooling air in the system, ensuring smoothness in the image fixing, sheet-nipping transport of the printing sheet. Further, a gear train transmits power simultaneously to the fixing rollers, and to a discharge roller pair. A middle gear of the train is disengagable by a mechanism releasing the pressure roller from the heating roller, in turn releasing drive power engagement of the discharge rollers, so that a sheet-jam condition in the system is easily remedied.
REFERENCES:
patent: 4369729 (1983-01-01), Shigenobu et al.
patent: 5223901 (1993-06-01), Endo et al.
patent: 5285245 (1994-02-01), Goto et al.
patent: 5287156 (1994-02-01), Shikada et al.
patent: 5477314 (1995-12-01), Tsuchiya et al.
Hayashi Daisuke
Tanaka Shin-ichi
Tomoe Tetsuro
Tsuchiya Hiroaki
Grimley Arthur T.
Lee Shuk Y.
Mita Industrial Co. Ltd.
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