Conveyor unit for book carrier in electro-photographic copying machines

A conveyor unit in an electrophotographic copying machine for selectively conveying either a thin original or an original having substantial thickness, such as a book, to an exposure station to form an electrostatic latent image of said original for a copying purpose, comprising:

• a book carrier including a frame having a transparent central portion on which said original having substantial thickness is placed to be conveyed to said exposure station;
• a driven member formed on said book carrier for conveying it;
• first and second commonly driven drive members on said unit respectively engageable with said thin original and said driven member for respectively driving said thin original and said carrier;
• and
• a rigid, stationary carrier retainer plate on said unit for maintaining a slight clearance with respect to the upper surface of the frame of said book carrier to constrain said book carrier from shifting upward as said drive member cooperates with said driven member while providing sufficient clearance to facilitate simple and rapid insertion and/or removal of the book carrier from the conveyor unit.