Electrophotographic desk copier

Claim 1

A DESK-TYPE ELECTROPHOTOGRAPHIC COPIER COMPRISING, IN COMBINATION, A HOUSING HAVING A REAR OPENING AND A FRONT OPENING, AN OPEN FACE TRAY ADAPTED TO OVERLIE AND COMPLETELY CLOSE SAID FRONT OPENING, MEANS IN SAID TRAY FOR SUPPORTING A PHOTO-CONDUCTIVE PLATE THEREIN, SAID TRAY BEING MOVABLE TO POSITION SAID PHOTO-CONDUCTIVE PLATE FOR EXPOSURE ADJACENT SAID FRONT OPENING IN SAID HOUSING, PLATE MEANS SLIDABLY MOUNTED ON SAID TRAY FROM A POSITION IN WHICH SAID PLATE MEANS CLOSES THE OPEN FACE OF SAID TRAY TO RENDER IT LIGHT-TIGHT, TO A POSITION IN WHICH THE OPEN FACE OF SAID TRAY IS UNOBSTRUCTED TO PERMIT EXPOSURE OF THE PHOTO-CONDUCTIVE PLATE THEREIN, MEANS ON SAID PLATE MEANS FOR CHARGING SAID PHOTO-CONDUCTIVE PLATE, MEANS FOR SUPPORTING AN ORIGINAL ADJACENT SAID REAR OPENING, ILLUMINATION MEANS WITHIN SAID HOUSING FOR PROJECTING LIGHT ONTO SAID ORIGINAL, A LENS FOR FOCUSING A LIGHT IMAGE REFLECTED FROM THE ORIGINAL ONTO SAID PLATE TO FORM A LATENT IMAGE THEREON WHEN SAID TRAY IS POSITIONED TO OVERLIE AND CLOSE SAID FRONT OPENING, SAID TRAY HAVING DEVELOPER POWDER CHAMBERS ALONG THE OPPOSITE SIDES THEREOF ADJACENT THE OPPOSITE SIDES OF SAID PHOTO-CONDUCTIVE PLATE, SAID CHAMBERS HAVING OPENINGS THEREIN PLACING SAID CHAMBERS IN COMMUNICATION WITH THE INTERIOR OF SAID TRAY CONTAINING SAID PLATE, SAID TRAY BEING PIVOTALLY MOUNTED ON SAID HOUSING ALONG A SIDE THAT IS PARALLEL TO THE LENGTH OF SAID CHAMBERS FOR SWINGING MOVEMENT ABOUT ITS PIVOTAL MOUNTING ABOVE AND BELOW A HORIZONTAL PLANE PASSING THROUGH THE PIVOTAL CONNECTION OF SAID TRAY TO SAID HOUSING EFFECTING CASCADING OF DEVELOPING POWDER OVER SAID PHOTO-CONDUCTIVE PLATE IN SAID TRAY.