Patent ID: 8731431

Claim:
A belt device, comprising: an endless belt to rotate in a belt moving direction; multiple belt tension rollers disposed in contact with an inner surface of the endless belt to tension the endless belt from inside a loop into which the endless belt is formed; a device which contacts the endless belt and charges particles on the belt to a regular charging polarity of residual toner on the belt; a rotary cleaning member, downstream of the device, to contact the endless belt opposite one of the multiple belt tension rollers at an outer surface of the endless belt to form a cleaning nip between the rotary cleaning member and the outer surface of the endless belt, the rotary cleaning member rotating its outer surface in a direction opposite the belt moving direction within the cleaning nip to remove residual toner remaining on an outer surface of the endless belt, the rotary cleaning member having a voltage applied thereto which is opposite to the regular charging polarity; and a toner collection roller, contacting the rotary cleaning member, having a voltage applied thereto which is opposite to the regular charging polarity and has a larger magnitude than the voltage applied to the rotary cleaning member, wherein the multiple belt tension rollers include an upstream tension roller disposed upstream from and adjacent to the belt tension roller disposed opposite the rotary cleaning member in the belt moving direction to press a tensioned belt area between the upstream tension roller and the opposing roller disposed opposite the rotary cleaning member against the rotary cleaning member, and wherein the upstream tension roller includes an insulating member at least partially covering a surface of the upstream tension roller.