Baler pick-up drive and counterbalance

Claim 1

IN AN AGRICULTURAL MACHINE HAVING A MOBILE FRAME HAVING A POWER SOURCE, A WORKING MEMBER CARRIED BY THE FRAME FOR MOVEMENT IN A VERTICAL ARC ABOUT A SUBSTANTIALLY HORIZONTAL PIVOT EXTENDING TRANSVERSELY TO THE DIRECTION OF MACHINE TRAVEL AND WIELDING A DRIVABLE PART ROTATING ON A SHAFT PARALLEL TO AND FORWARDLY SPACED FROM SAID PIVOT, AND VERTICALLY ADJUSTABLE SUPPORT MEANS FOR LIMITING THE DOWNWARD MOVEMENT OF SAID WORKING MEMBER ABOUT ITS PIVOT, IMPROVED DRIVE MEANS FOR ROTATING SAID DRIVABLE PART AND COUNTERBALANCING THE WORKING MEMBER COMPRISING A DRIVEN SHEAVE CARRIED BY THE WORKING MEMBER SHAFT, A DRIVE SHEAVE ROTATED BY SAID SAID POWER SOURCE ABOUT AN AXIS PARALLEL TO AND SPACED ON THE FRAME FORWARDLY AND UPWARDLY FROM THE DRIVEN SHEAVE AXIS, A FIRST IDLER SHEAVE ROTATING ABOUT AN AXIS SPACED ON THE FRAME PARALLEL TO AND DOWNWARDLY FROM THE DRIVE SHEAVE AXIS AND FORWARDLY FROM THE DRIVEN SHEAVE AXIS, A LEVER MOVABLE ABOUT A PIVOT AFFIXED TO THE FRAME, A SECOND IDLER SHEAVE ROTATING ABOUT AN AXIS CARRIED BY THE LEVER PARALLEL TO AND UPWARDLY FROM THE DRIVEN SHEAVE AXIS, A CONTINUOUS BELT MOVING SUCCESSIVELY ABOUT THE DRIVEN SHEAVE, THE FIRST IDLER, THE DRIVE SHEAVE, AND THE SECOND IDLER, AND MEANS FOR BIASING THE SECOND IDLER AGAINST THE BELT TO PROVIDE TENSION IN SAID BELT WHICH EXERTS AN UPWARD FORCE ON THE DRIVEN SHEAVE TENDING TO RAISE THE WORKING MEMBER ABOUT ITS PIVOT, PARTLY COUNTERBALANCING THE WEIGHT OF THE WORKING MEMBER.