Motor powered accumulating conveyor

Claim 1

IN A CONVEYOR FOR ARTICLES HAVING A PLURALITY OF DRIVEN ROLLERS FORMING AN ARTICLE TRANSPORTING SURFACE, A POWER DRIVEN PROPELLING MEMBER BENEATH SAID ROLLERS AND A PLURALITY OF PRESSURE ROLLERS BENEATH SAID PROPELLING MEMBER; SAID CONVEYOR BEING CHARACTERIZED BY A FIRST ZONE AND A SECOND ZONE; SAID FIRST ZONE BEING AT THE DISCHARGE END OF SAID CONVEYOR AND OF A LENGTH TO ACCOMODATE AT LEAST A PORTION OF ONE ARTICLE; SAID SECOND ZONE BEING ADJACENT THERETO AND ADAPTED TO DISCHARGE ARTICLES INTO SAID FIRST ZONE; SAID PRESSURE ROLLERS IN SAID FIRST ZONE BEING FIXEDLY SUPPORTED TO HOLD SAID PROPELLING MEMBER IN DRIVING ENGAGEMENT WITH SAID DRIVEN ROLLERS; MEANS SUPPORTING SAID PRESSURE ROLLERS IN SAID SECOND ZONE FOR VERTICAL MOVEMENT, SAID PRESSURE ROLLERS IN ONE POSITION HOLDING SAID MEMBER IN DRIVING ENGAGEMENT WITH SAID DRIVEN ROLLERS AND IN ANOTHER POSITION DISENGAGED FROM SAID DRIVEN ROLLERS; A SENSING ELEMENT ADJACENT THE DISCHARGE END OF SAID FIRST ZONE, SAID SENSING ELEMENT BEING POSITIONED TO BE ACTUATED BY ARTICLES MOVING OVER SAID DRIVEN ROLLERS;