Patent ID: 7568691

Claim:
An apparatus having a sheet feeding apparatus for blowing an air to sheets stacked on a tray, loosening the sheets, and feeding the loosened sheet toward an image forming unit, comprising: an air blowing mechanism which is constructed by combining a plurality of fans in order to blow the air to the sheets stacked on the tray; a control unit which controls the air blowing mechanism so as to form a set wind pressure by combining the plurality of fans, the control unit controlling rotational speeds of at least two of the plurality of fans, individually, wherein the control unit controls rotational speeds of at least two of the plurality of fans of the air blowing mechanism so as to be equal to a target rotational speed set for each of the plurality of fans so that the set wind pressure can be obtained, wherein the control device discriminates whether or not the rotational speeds of the plurality of fans are within target rotational speed ranges which have been set for the plurality of fans, and wherein the rotational speeds of the plurality of fans are controlled by PWM control and if it is determined by the control device that the rotational speeds of the plurality of fans are not within the target rotational speed ranges, a PWM value of the fan whose rotational speed is not within the target rotational speed range is adjusted; and a memory which stores the PWM values of the every plurality of fans at the time when it is determined by the control device that the rotational speeds of the plurality of fans are within the target rotational speed ranges, wherein if it is determined by the control device that the rotational speeds of the plurality of fans are not within the target rotational speed ranges, the PWM value of the fan whose rotational speed is not within the target rotational speed range is set to the PWM value stored in the memory.