Driving device

A driving device including a drive source, and an input-side joint member to be driven to rotate by the drive source, the driving device configured to drive a driven body to rotate by connecting the input-side joint member to an output-side joint member fixed to the driven body, the driving device comprising:

• a shaft having a screw portion formed on an outer peripheral surface thereof;
• a support member configured to rotatably support the shaft;
• a restraining member configured to restrain the shaft so as not to be movable in an axial direction thereof;
• and
• a connection portion formed in one end portion of the shaft and having the output-side joint member detachably connected thereto, wherein
• the input-side joint member is engaged by thread with the screw portion of the shaft so as to be rotatably supported, and is configured to, by being driven to rotate by the drive source, be able to move between a connection position where the input-side joint member is connected to the output-side joint member and a withdrawal position where the connection is cut off, and
• the driving device further comprises a compression spring configured to, when the input-side joint member is moved from the withdrawal position to the connection position by the drive source, compressively deform, while being sandwiched by the input-side joint member and the output-side joint member.