Mechanism for mounting and dismounting a screen-like photosensitive medium

A construction for enabling a screen-like photosensitive medium, having a number of fine passage openings, to be removably mounted with respect to an apparatus body, comprising:

• a photosensitive medium frame member for supporting said photosensitive medium in the form of a drum;
• a rotary center shaft for providing the center of rotation of said photosensitive medium frame member, said shaft being rotatably fixed at one end to the apparatus body;
• a drive unit mounted adjacent the fixed end of said rotary center shaft;
• a frame member side supporting unit for supporting that side of said photosensitive medium frame member which is adjacent to said drive unit, with respect to said rotary center shaft;
• an electrical power consuming element provided inside of said photosensitive medium frame member;
• and
• power source means, coupled to said power consuming element, provided on the apparatus body side;
• said drive unit having a rotary bearing member, drive force transmitting means disposed radially outward of said rotary bearing member, and a fixed portion for carrying electrical wiring inside of the bearing member, said fixed portion being fixed on said rotary center shaft, said frame member side supporting unit having, outside of the rotary bearing member, a portion for supporting said photosensitive medium frame member and having a fixed portion for carrying electrical wiring disposed inside of said bearing member, said latter fixed portion lying on said rotary center shaft and being slidable relative to said center shaft, said electrical wiring on said drive unit side and said electrical wiring on said side supporting unit side having removable contacts, whereby when said photosensitive medium supporting member is mounted or dismounted with respect to the apparatus body, said power source portion on the body side and said power consuming portion on said supporting member side are connected or disconnected by said contacts.