Patent ID: 7720398
Filing Date: 2010-05-18
Classification: G03G

Abstract:
1. A full-color image forming apparatus, comprising: a fixing section that fuses a toner image formed on a sheet by heating to fix the toner image to the sheet, a sheet conveyer for conveying the sheet, a jam detector that detects a sheet jam in the fixing section, a jam recovery detector for detecting a recovery from the sheet jam after the sheet jam is detected by the jam detector, a coverage rate calculator that calculates a coverage rate of a sheet from an image data, based on which toner image was formed on the sheet, and a controller that causes the sheet conveyer to discharge a sheet having no toner image formed thereon by way of the fixing section if the recovery from the sheet jam is detected by the jam recovery detector and if the calculated coverage rate of the sheet that caused the jam, as calculated by the coverage rate calculator, is equal to or higher than a predetermined value, wherein the coverage rate calculator calculates a coverage rate of each color from an image data for forming a full-color image, and sets a sum value of the coverage rates of the respective colors as a coverage rate serving as a judgment criteria by the controller as to determine a quantity of sheets having no toner image formed thereon to be discharged by the sheet conveyer.