APPARATUS TO PREVENT CONTAMINATION OF FIXING UNIT IN IMAGE FORMING APPARATUS AND METHOD OF USING SUCH

摘要

When the density of a toner image of a leading end of a printing sheet is no less than a predetermined reference density, a printing start time is delayed or printing data is deleted so that printing data is not printed in the leading end of the sheet. When the printing is performed in a state where a cover used for copying is opened, a printing start time is delayed or the printing data of the leading end of the printing sheet is deleted. Therefore, it is possible to prevent a fixing unit from being contaminated due to the toner image transferred to the leading end of the printing sheet.