Bag filling machines

Claim 1

A BAG FILLING MACHINE COMPRISING A CONDITIONING CHAMBER, A BAG SUPPORTING SPOUT COMMUNICATING WITH SAID CHAMBER AND ADAPTED TO PROJECT INTO A BAG TO BE FILLED, A FIRST CONDUIT EXTENDING BETWEEN SAID SPOUT AND SAID CHAMBER, CUT OFF MEANS LOCATED IN SAID FIRST CONDUIT FOR CUTTING OFF THE FLOW OF MATERIAL THERETHROUGH, BAG WEIGHT RESPONSIVE MEANS FOR CAUSING OPERATION OF SAID CUT OFF MEANS WHEN A PREDETERMINED AMOUNT OF MATERIAL HAS BEEN FED INTO SAID BAG TO TERMINATE THE BAG FILLING OPERATION, AN INLET VALVE LOCATED IN THE UPPER PORTION OF SAID CHAMBER FOR PERMITTING MATERIAL TO FLOW INTO SAID CONDITIONING CHAMBER, MEANS FOR CLOSING OFF SAID INLET VALVE DURING THE BAG FILLING OPERATION, SAID MEANS INCLUDING A LEVEL RESPONSIVE DEVICE WHICH ALSO MAINTAINS A FREE SPACE IN THE UPPER PORTION OF SAID CONDITIONING CHAMBER, SAID CONDITIONING CHAMBER HAVING A DIFFUSER PAD LOCATED AT THE BOTTOM THEREOF, SAID SPOUT BEING LOCATED ABOVE THE LEVEL OF SAID DIFFUSER PAD, THE INNER AND LOWER END OF SAID FIRST CONDUIT BEING LOCATED IMMEDIATELY ABOVE SAID DIFFUSER PAD, A SECOND CONDUIT COMMUNICATING WITH SAID FILL SPACE, A CONSTANT DELIVERY AIR PUMP CONNECTED TO SAID SECOND CONDUIT, A PRESSURIZING VALVE INTERPOSED IN SAID SECOND CONDUIT FOR CONTROLLING THE FLOW OF AIR FROM SAID AIR PUMP TO SAID CHAMBER, AND A PRESSURE RELIEF VALVE OF THE CONTINUOUSLY BLEEDING TYPE CONNECTED TO SAID SECOND CONDUIT TO MAINTAIN THE AIR WITHIN SAID CONDUIT AT A SUBSTANTIALLY CONSTANT PRESSURE.