Method of forming an image on both sides of a sheet
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United States of America Patent
Stats
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Dec 4, 1990
Grant Date -
N/A
app pub date -
Jan 18, 1990
filing date -
Jan 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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