Patent ID: 8693905

Claim:
An image forming apparatus comprising: a sensor that detects at least one property of a developer material; a transport unit that contacts the developer material during operation, and that moves the developer material toward a recording medium; and a controller that receives data regarding the at least one property of the developer material from the sensor unit and sets both an attraction voltage and a velocity of the transport unit based on the data regarding the detected at least one property of the developer material, wherein the controller sets the attraction voltage and the velocity to maximum constant values when the data regarding the at least one property is a value that is less than a first property threshold value, the controller sets the attraction voltage and the velocity to minimum constant values greater than zero when the data regarding the at least one property is a value that is greater than a second property threshold value, and the controller decreases the attraction voltage and the velocity linearly as the data regarding the at least one property increases when the data regarding the at least one property is a value between the first property threshold value and the second property threshold value.