COLOR IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately transmit angular velocity of an output shaft to a photoreceptor by matching a shaft center of the output shaft and a shaft center of a photoreceptor supporting shaft and having couplings of both engaged in a state where an image forming unit that has received the thrust force of the output shaft is received by a device body. SOLUTION: In this color image forming device, the photoreceptor shaft 40 is moved forward while being matched to the shaft center of the output shaft 70 when the tip of a tapered part 75 of the output shaft 70 is pushed out and engagement with a recessed tapered surface 48 of the photoreceptor shaft 40 is started. The shaft center of the photoreceptor shaft 40 and the shaft center of the output shaft 70 are completely matched with and the photoreceptor 30 is accurately positioned to an image forming position 10 when the tapered tip part 75 and the recessed tapered part 48 are engaged to each other and the output shaft 70 is further pushed by a thrust bearing. At this time, the edge surface of a flange 41 is pushed against a side plate bearing of the image forming unit 3 by the thrust force imparted by the output shaft 70 and the side plate bearing part is received by being abutted to a left sidewall 20L of a carriage 2. The whole image forming unit 3 including the photoreceptor 30 is made to travel inside the carriage.