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US 6,275,676 B1Granted
Duplex image forming apparatus with sheet interval selection means
AssigneeCanon Kabushiki Kaisha
InventorKenji Ushio
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Abstract
The present invention provides an image forming apparatus having an electrophotographic image forming means for fixing a toner image formed on a sheet to the sheet by heating the toner image, wherein an interval between the sheets when the sheets are continuously sent to the image forming means to form images on both surfaces of plural sheets is selected to become smaller than an interval between the sheets when the sheets are continuously sent to the image forming means to form images on one surfaces of the plural sheets.
Claims6
An image forming apparatus comprising:
- electrophotographic image forming means for forming a toner image on a sheet;
- fixing means for fixing the toner image formed on the sheet by heating the toner image;
- sheet supply means for supplying sheets to said image forming means;
- sheet supporting means for supporting sheets on which an image has been formed on a first surface;
- and
- re-convey means for returning sheets supported on the sheet supporting means to said image forming means to form an image on second surfaces of the sheets supported on the sheet supporting means;
- wherein the sheets returned to the image forming means by said re-convey means and the sheets conveyed by said sheet supply means are conveyed to the image forming means alternately;
- and
- a sheet interval when sheets are alternately conveyed to said image forming means by said sheet supply means and said re-convey means is selected to be smaller than a sheet interval when sheets are continuously conveyed to said image forming means to form images on only one surface of each of the sheets.
6 more elements
Dependencies are inferred from the claim text.