Auxiliary stack holder

Claim 1

IN A SHEET FEEDING APPARATUS HAVING AN ELEVATOR FOR SUPPORTING A STACK OF SHEETS AND SHEET FEEDING MEANS FOR REMOVING SHEETS SUCCESSIVELY FROM THE TOP OF THE STACK; MEANS FOR TEMPORARILY SUPPORTING, IN POSITION FOR CONTINUED SUCCESSIVE REMOVAL BY SAID SHEET FEEDING MEANS, A PLURALITY OF SHEETS REMAINING IN THE STACK AS THE SUPPLY OF SHEETS ON THE STACK APPROACHES EXHAUSTION, SAID TEMPORARY SUPPORTING MEANS INCLUDING A FRAME HAVING A PLURALITY OF SPACED FORKS THAT ARE IN PIVOTAL CONNECTION WITH THE FRAME AND ARE ADAPTED FOR INSERTION UNDER SAID SHEETS TO BE SUPPORTED THEREBY, DRIVING MEANS FOR MOVING THE FRAME TO PLACE THE FORKS SELECTIVELY IN SHEET-SUPPORTING POSITION AND FOR RETRACTING THE FORKS FROM THE SHEET-SUPPORTING POSITION TO ENABLE THE ELEVATOR TO BE LOWERED FOR RELOADING WITH ANOTHER STACK OF SHEETS AND THEN RAISED TO OPERATIVE POSITION TO INCLUDE IN THE STACK THOSE SHEETS THEN SUPPORTED BY THE FORKS, ALL WITHOUT CEASING THE OPERATION OF THE SHEET FEEDING MEANS, SAID FRAME BEING ROTATABLE ABOUT ITS PIVOT AXIS AN AMOUNT SUFFICIENT TO SWING THE FORKS TO AN UPRIGHT POSITION, AND MEANS FOR MAINTAINING SAID FORKS IN SAID UPRIGHT POSITION.