BELT DRIVING DEVICE AND ELECTROPHOTOGRAPHIC DEVICE EQUIPPED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide an electrophotographic color printer for controlling the meandering of a belt by using the torque of a detecting ring 29 rotationally driven during the meandering of a transfer carrying belt 1 arranged along a carrying span for carrying recording paper p to a plurality of image forming parts A-D to move a movable end 6a of a control roller 6 to the front side of the belt in its running direction, achieving proper meandering control function of the control roller 6 for the transfer carrying belt 1 without being excessively restricted on a belt layout. SOLUTION: If a friction coefficientμbetween the control roller 6 and the transfer carrying belt 1 isμ=0.3, a contact area S between both of them 6, 1 is set to be S>=8250 mm2.