Patent ID: 6053832
Filing Date: 2000-04-25
Classification: B65G,F16H

Abstract:
A belt driving device, comprising:a drive pulley;a driven pulley;an endless belt which spans around the drive pulley and the driven pulley and which is driven by rotation of the drive pulley; anda belt shift correcting member which, when the endless belt is shifted toward one side in an axial direction of one of the drive pulley and the driven pulley, increases an angle of a circumference of said one of the drive and driven pulleys contacting a width-wise end part of the endless belt at said one side in the axial direction of said one of the drive and driven pulleys such that the angle of the circumference of said one of the drive and driven pulleys contacting said width-wise end part of the endless belt at said one side in the axial direction of said one of the drive and driven pulleys is larger at a part of said one of the drive and driven pulleys contacting an edge part of said width-wise end part of the endless belt than at other parts of said one of the drive and driven pulleys contacting other parts of said width-wise end part of the endless belt and said angle of the circumference of said one of the drive and driven pulleys contacting said width-wise end part of the endless belt decreases toward a part of said one of the drive and driven pulleys contacting a width-wise center part of the endless belt,wherein a coefficient of friction of said one of the drive and driven pulleys relative to the endless belt is higher at a circumferential surface of an axial end part thereof, which comes in contact with said width-wise end part of the endless belt at said one side in the axial direction of said one of the drive and driven pulleys, than at a circumferential surface of an axial center part of said one of the drive and driven pulleys.