Duplex copying apparatus

In a copying apparatus which includes a housing, an original holder, a single photosensitive member, means to produce and develop a latent image of said original on said photosensitive member including optical means to expose said photosensitive member to said original, and means for transferring and fixing the developed image onto a copy paper, the improvement comprising additional means enabling said copying apparatus to produce images of an original on both sides of said copy paper which includes first and second copy paper cassettes disposed at a copy paper feeding station and a copy paper discharging station, respectively, said first copy paper cassette being detachably mounted at said copy paper feeding station and accommodating copy papers to be fed to said transferring and fixing means, said first copy paper cassette also being detachably mountable at said copy paper discharging station, said second copy paper cassette being detachably mounted at said copy paper discharging station for receiving copy paper upside down, relative to the copy paper in said first copy paper cassette, after completion of a copying process on one side thereof, said second copy paper cassette also being detachably mountable at said copy paper feeding station, whereby the positions of said first and second copy paper cassettes is reversed and another copying process is conducted to thereby obtain a copy paper having original images on both sides thereof.

A duplex copying machine adapted to produce images of an original on both sides of a copy paper comprising a housing, an original holder, an exposure slit, optical means for exposing a photosensitive member to an original image through said slit, copying processing means for forming said original image on one side on said copy paper, driving means for driving said copying processing means, a first copy paper cassette for accommodating copy papers to be fed to said copying processing means, and a second copy paper cassette for receiving copy paper upside down, relative to the copy paper in said first cassette, after completion of a copying process on one side thereof;

• said housing including a first holder means positioned at a copy paper feeding station and a second holder means positioned at a copy paper discharging station, said holder means interchangeably and detachably mounting said first and second cassettes, and at least said second cassette including arranging means for properly stacking copy paper in said second cassette as said paper exits said discharging station, whereby after said copy paper has been fed through the machine from said first cassette to impose an image on one side of the copy paper, and has been arranged in said second cassette, the positions of said first and second cassettes are reversed and another copying process is conducted on the other side of the copy paper to thereby obtain a copy paper having original images on both sides.