Electrophotographic copying machine
AssigneeOlympus Optical Co., Ltd.
InventorsKazuo Sugawa, Norio Amemiya
Life of this patent
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Abstract
A copying machine includes a shutter mechanism comprising a light shield member which intercepts the incidence of extraneous light onto a photosensitive drum through an exposure window, and a detecting member which is operated by a cover which forms a conveyor unit for a sheet-shaped original or by a book carrier on which a thick original is placed. A movement of the light shield member into or out of an exposure light path is controlled by the operation of the detecting member.
Claims8
An electrophotographic copying machine comprising
- a cover which is located in opposing relationship with an exposure window when copying from an original in the form of a sheet and defines a conveyor unit for the original and which is angularly moved to a position remote from the exposure window when copying from a thick original and defines an extension of an original conveying path for allowing a thick original placed on a book carrier to move past the exposure window;
- a detecting member disposed adjacent to the exposure window and projecting above the plane of the original conveying path so as to be depressed by the cover or the book carrier to thereby detect the presence of the cover or book carrier above the exposure window which is effective to intercept the incidence of extraneous light;
- and a light shield member adapted to be moved from a position where it intercepts an exposure light path extending between the exposure window and a photosensitive drum on which an electrostatic latent image corresponding to an original is formed to a position opening the exposure light path in response to the depression of the detecting member by the cover or book carrier.
An electrophotographic copying machine comprising a photosensitive surface and cover means movable between a first position in opposing relationship with an exposure window when copying from an original in the form of a sheet positioned between said cover and said window, and a second position displaced from said exposure window;
- means for providing a light path for directing light from the exposure window to said photosensitive surface;
- and
- light shielding means movable from a position displaced from said light path enabling light passing through the exposure window to reach said photosensitive surface to a position intercepting said light path for preventing light from passing through the exposure from reaching the photosensitive surface responsive to placement of the cover means in said first position.
Dependencies are inferred from the claim text.