Package binding machines

Claim 1

A FEED DRIVE MECHANISM FOR CONTROLLING THE FEEDING AND RETRACTION OF BINDING MATERIAL IN A PACKAGE BINDING MACHINE, COMPRISING A FORWARD DRIVING ROLLER AND A REVERSE DRIVING ROLLER ROTATABLY MOUNTED IN A SUPPORT, COMMON DRIVING MEANS COUPLED TO SAID FORWARD AND REVERSE DRIVING ROLLERS AND OPERATIVE TO DRIVE SAID ROLLERS CONTINUOUSLY IN OPPOSITE DIRECTIONS OF ROTATION, A FORWARD DRIVE PRESSURE IDLER ROTATABLY CARRIED ADJACENT SAID FORWARD DRIVING ROLLER, A REVERSE DRIVE PRESSURE IDLER ROTATABLY CARRIED ADJACENT SAID REVERSE DRIVING ROLLER, SAID PRESSURE IDLERS BEING ROTATABLY MOUNTED IN A TILTING HOLDER PIVOTED ON SAID SUPPORT, FLUID PRESSURE MOTOR MEANS BEING PROVIDED MOUNTED BETWEEN SAID TILTING HOLDER AND SAID SUPPORT AND SELECTIVELY OPERABLE TO PIVOT SAID TILTING HOLDER IN ONE DIRECTION TO MOVE ONE PRESSURE IDLER INTO RUNNING ENGAGEMENT WITH ITS CORRESPONDING DRIVING ROLLER AND IN THE OPPOSITE DIRECTION TO MOVE THE OTHER PRESSURE IDLER INTO RUNNING ENGAGEMENT WITH ITS CORRESPONDING DRIVING ROLLER, THE TILTING HOLDER HAVING AN INTERMEDIATE INOPERATIVE POSITION IN WHICH NEITHER PRESSURE IDLER IS IN RUNNING ENGAGEMENT WITH ITS CORRESPONDING DRIVING ROLELR.