Patent ID: 7991339

Claim:
An image forming device used with an imaging system for setting toner particles on a recording media, comprising: a frame unit; a pressure roller disposed on the frame unit for causing the toner particles to adhere on the recording media; and a guiding assembly disposed on the frame unit in pressing contact with the pressure roller, the guiding assembly comprising: an elongated heating unit disposed across the guiding assembly parallel to the rotational axis of the pressure roller, a belt tensioner assembly including a pair of base pieces and elastic pieces disposed on the two ends of the guiding assembly, wherein the base piece has a free end portion, a pivot portion and a connecting portion in sequential order, wherein the pivot portion has a pivoting axis parallel to the rotational axis of the pressure roller, wherein the pivot portions of the base pieces and the free end portions of the base pieces have rolling wheels mounted thereon, wherein one end of the elastic piece is coupled to the connecting portion of the base piece; and a belt looped over the rolling wheels of the free end portions of the base piece, the rolling wheels of the pivot portion of the base piece, and the elongated heating unit, wherein the belt is nipped between the pressure roller and the heating unit.