US Patent 10397419 Hinge mechanism and image forming apparatus

A hinge mechanism includes a first member, a second member, and a stopper mechanism. The stopper mechanism has a path and a moving member. The moving member is provided in the path. The path includes a first path part and a second path part. The first path part is located in the first member. The second path part is located in the second member. The first member and the second member are changeable between a first communication state, a non-communication state, and a second communication state depending on a turning angle of the second member relative to the first member.