DRIVING FORCE TRANSMISSION DEVICE, DRIVING DEVICE AND IMAGING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a driving force transmission device which is equipped with a joint having an intermediate transmission member, and is capable of absorbing eccentricity, declination and axial displacement of rotary shafts between the driving side and the driven side, and reducing vibration due to looseness in fitting parts without degrading rotational rigidity.SOLUTION: A drive transmission device 115 includes a detachable coupling 130 including: a driving-side member 131 connected to an output shaft 123 of a drive motor 121; a driven-side member 132 connected to a drum driving shaft 91 of a photoreceptor drum 40; and an intermediate body 140 for transmitting rotational driving force between the driving-side member 131 and the driven-side member 132. The drive transmission device 115 has a brake mechanism 150 which presses a brake pad 152 provided at the front end of a brake arm 151 against the outer peripheral surface of a brake disc 142 provided around the intermediate body 140 of the coupling 130 so as to apply friction force therebetween.