Method of forming an image on both sides of a sheet

Details Method of forming an image on both sides of a sheet Method of forming an image on both sides of a sheet

1990-01-18

1990-12-04

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Methods

355 24, 355314, 355319, G03B 2732, G03B 2752, G03G 2100

Patent

active

049757385

ABSTRACT:
A method of forming images on both sides of a plurality of sheets by an image forming apparatus having an image forming unit and a sheet path selection unit comprises a repetition of a group of substeps as a job unit, the group of substeps including substeps of feeding a predetermined number of new sheets to the image forming unit, forming the images on a first side of the sheets, turning over the side of the sheets by the sheet path selection unit, refeeding the predetermined number of sheets to the image forming unit responsive to the turning-over of each sheet, forming the images on a second side of the sheets by the image forming unit, and discharging the predetermined number of sheets by the sheet path selection unit each time the sheet is formed with the image on the second side thereof, wherein said substep of feeding the new sheets is commenced for a new job unit when the last sheet of the currently performed job unit is fed to the sheet path selection unit after formed with the image on its second side but before the last sheet is discharged.

REFERENCES:
patent: 4499500 (1985-02-01), Nagashima
patent: 4640607 (1987-02-01), Bray
patent: 4692020 (1987-09-01), Tsujihara
patent: 4806979 (1989-02-01), Tokoro et al.
patent: 4845527 (1989-07-01), Murata et al.
patent: 4884110 (1989-11-01), Tsurubuchi et al.

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