摘要 |
In the present invention, an occlusion detection mechanism is provided with a drive-side gear part, a pusher-side gear part, an insulating part, a first contact part, a second contact part, and a temporary holding part. The insulating part electrically insulates the drive-side gear part and the pusher-side gear part from each other. When the rotational resistance on the pusher-side gear part exceeds a predetermined force, the temporary holding part releases the pusher-side gear part from the held state. |