Sheet feed trays

Claim 1

IN A COPY PRODUCING MACHINE PROVIDED WITH A SHEET FEED TRAY FOR SUPPORTING AND POSITIONING A STACK OF COPY SHEETS FOR INPUT TO THE MACHINE AND PROVIDED WITH A SHEET FEED DRIVE MEANS DISPOSED ADJACENT THE SHEET FEED TRAY FOR RETRACTILE MOVEMENT INTO ENGAGEMENT WITH THE UPPERMOST SHEET OF THE STACK OF COPY SHEETS THEREON, THE IMPROVEMENT IN THE SHEET FEED TRAY COMPRISING: A PLATEN FOR SUPPORTING THE STACK OF COPY SHEETS, SAID PLATEN HAVING A FRONT EDGE; AT LEAST ONE SIDE RAIL MOUNTED ON SAID PLATEN AND EXTENDING REARWARDLY FROM SAID FRONT EDGE FOR LATERALLY CONTAINING THE STACK OF COPY SHEETS; A CORNER SEPARATOR MOUNTED FOR MOVEMENT VERTICAL TO SAID PLATEN AT SAID FRONT EDGE OF SAID PLATEN ADJACENT SAID SIDE RAIL, SAID CORNER SEPARATOR INCLUDING A VERTICAL STOP PORTION AND A HORIZONTAL FLANGE PORTION CONNECTED THERETO, SAID VERTICAL STOP PORTION EXTENDING LATERALLY OF SAID SIDE RAIL TO PROVIDE A FRONT STOP FOR THE STACK OF COPY SHEETS AND SAID HORIZONTAL FLANGE PORTION EXTENDING REARWARDLY FROM SAID VERTICAL STOP PORTION TO OVERLIE A CORNER OF THE STACK OF COPY SHEETS; AND SPRING LOADED CORNER SEPARATOR LIFT MEANS UPSTANDING FROM SAID PLATEN VERTICALLY OPERATING SAID CORNER SEPARATOR INTO A RAISED STACK LOADING POSITION, SAID LIFT MEANS BEING POSITIONED TO BE ENGAGED BY THE SHEET FEED DRIVE MEANS SO THAT AS THE SHEET FEED DRIVE MEANS IS MOVED INTO ENGAGEMENT WITH THE UPPERMOST SHEET OF THE STACK OF COPY SHEETS SAID LIFT MEANS IS MOVED TO LOWER SAID CORNER SEPARATOR INTO ENGAGEMENT WITH THE CORNER OF THE STACK OF COPY SHEETS AT SAID FLANGE PORTION.