Document stacking device

Claim 1

IN A MACHINE HAVING MEANS TO FEED A SHEET OF PAPER EDGEWISE ALONG A GUIDED PATH OF TRAVEL, A SHEET STACKING DEVICE FOR THE MACHINE COMPRISING A SHEET GUIDE MEMBER EXTENDING ALONG THE PATH OF TRAVEL AND FORMING A SIDE OF A SHEET STACKING POCKET AND ENTRANCE THERETO, SAID GUIDE MEMBER HAVING AN OPENING THERETHROUGH, AN AIR JET ADJACENT SAID ENTRANCE DIRECTING A STREAM OF AIR FROM THE POCKET SIDE OF SAID GUIDE MEMBER ACROSS THE PATH OF TRAVEL OF THE SHEET AND THROUGH SAID OPENING, A SHEET ABUTMENT MEMBER FORMING AN END WALL OF THE POCKET AND HAVING A JUNCTION WITH SAID GUIDE MEMBER, A MOVABLE BACK-UP PLATE FORMING THE OTHER SIDE WALL OF THE POCKET AND MOVABLE AWAY FROM SAID GUIDE MEMBER TO ACCOMMODATE AN INCREASING NUMBER OF SHEETS IN THE POCKET, AN AIR MANIFOLD HAVING A PLURALITY OF AIR OUTLETS ON THE OTHER SIDE OF SAID GUIDE MEMBER FROM SAID AIR JET AND DIRECTING AIR STREAMS THROUGH SAID GUIDE MEMBER TO URGE A PASSING SHEET TOWARD SAID BACK-UP PLATE, AND SAID MANIFOLD HAVING AN INLET ON THE SAID OTHER SIDE OF SAID GUIDE MEMBER IN REGISTRY WITH SAID AIR JET TO RECEIVE AIR FROM THE LATTER FOLLOWING THE PASSING OF A SHEET BETWEEN SAID JET AND INLET.