Patent ID: 7905346
Filing Date: 2011-03-15
Classification: B41J,G03G

Abstract:
1. A belt skew correction controlling method comprising: detecting a skew speed of a wound endless belt, wherein a transport face of the endless belt is formed by the endless belt being tightly extended between a driving roller and a driven roller; calculating a difference between the skew speed that is acquired in the detecting of the skew speed and the initial target value; determining whether a value acquired in the calculating of the difference is within a predetermined range; maintaining an angle of a skew correcting roller that is wound around the endless belt and can be inclined, by an inclination mechanism which can be selectively driven, such that the inclination mechanism is not driven in a case where the value is determined to be within the predetermined range in the determining of whether the value is within the predetermined range, wherein the skew correcting roller is located between the driving roller and driven roller and contact the portion of the endless belt which is not the transport face; and displacing the angle of the skew correcting roller to a side on which the value acquired in the calculating of the difference becomes closer to the initial target value by driving the inclination mechanism in a case where the value is determined to be out of the predetermined range in the determining of whether the value is within the predetermined range.