| 摘要 |
PROBLEM TO BE SOLVED: To minimize damage to the body of machine such as the breakage of a photoreceptor by immediately detecting the breakage of a transfer belt, in the case where plural photoreceptor drums and a single transfer belt are used. SOLUTION: This device is constituted so that the plural photoreceptor drums 25 corresponds to printing colors are arranged in the same plane, electrostatic latent images are formed on the surfaces of the respective photoreceptor drums 25 by an electrophotographic method and developed by developing parts and materials to be recorded are carried to the transfer positions A of the drums 25 by a transfer belt 20, to superimpose/transfer the developed images on the respective drums 25 to the materials to be recorded. At this time, a transfer belt damage detecting sensor 40 capable of detecting the tearing and pinhole of the transfer belt 20 is provided. Since the damage of the transfer belt 20 can be immediately detected and the exchange period of the belt 20 is easily judged, the damage to the machine body such as the breakage of the photoreceptor can be minimized. |
