Patent ID: 7673869

Claim:
An image forming apparatus comprising: a sheet mounting part for mounting a plurality of sheets thereon; a sheet feeding part having a sheet feeding roller for feeding one of the plural sheets mounted on the sheet mounting part to a sheet conveying path by rotating the sheet feeding roller; a sheet detecting part for detecting the sheet fed by the sheet feeding part on the sheet conveying path; and a control part for repeating a first operation of rotating and stopping the sheet feeding roller in a predetermined interval and executing a second operation of rotating the sheet feeding roller at a predetermined speed after repeating the first operation, the first and second operations being executed during a period which begins when starting the feeding of the sheet and ends when detecting the sheet on the sheet conveying path, wherein the control part includes a calculating part for calculating the amount of friction between the sheet and the sheet feeding roller, and a setting part for setting the number of times of repeating the first operation based on the calculated amount of friction, and wherein the calculation of the calculating part includes calculating the frictional coefficient based on the type of the sheet, the material of the sheet feeding roller, and the wear status of the sheet feeding roller, wherein the setting of the setting part includes setting the number of times of repeating the first operation based on the calculated frictional coefficient.