Abstract: A device suitable for an electrophotographic copying machine which comprises a detection bar for detecting the transport of a copy paper and causing its pivotal movement by being pushed by the front side of the copy paper, a plurality of paper prevention claws responsive to the position of the detection bar for selectively allowing the transport of the copy paper and, otherwise, preventing the transport of the copy paper, and a rotatable shaft for coaxially coupling the detection bar with the paper prevention claws. According to the pivotal movement of the detecton bar, the rotatable shaft can be rotated to thereby rotate and lift the plurality of paper prevention claws.

Abstract: A table start position selecting mechanism for an electrophotographic copying machine of the type with a movable table comprises a unistructural lamp unit with a lamp and a primary mirror for initially reflecting light from a document on the table. A table start position detection switch is attached to a supporting plate which is independent of the lamp unit and adjustable with respect thereto in the direction of motion of the table. A positioning device such as a pin is affixed to the lamp unit at the center of its optical axis such that the switch-supporting plate can be easily and accurately positioned with respect to the lamp unit in the direction of motion of the table.

Abstract: A document table reciprocating device for a copying machine comprising a pair of sprockets which are disposed near to end of the path of a document table, a chain engaged around the pair of sprockets, a roller engaged with the chain, and a plate having an opening in such a shape for enabling the roller to stay in the opening when the roller is positioned adjacent a turning point around the sprocket.