Arrangement for stage-wise advancement of recording carriers

Claim 1

APPARATUS FOR THE STAGEWISE MOVING OF STRIP, BAND, AND SIMILARLY FORMED RECORDING CARRIERS, COMPRISING A PAIR OF SPACED CLAMPING DEVICES DISPOSED FOR INTERMITTENT ENGAGEMENT WITH A RECORDING CARRIER TO ALTERNATELY APPLY BRAKING FORCES THERETO, A ROTATABLE CAM DISPOSED BETWEEN SAID CLAMPING DEVICES, CONSTRUCTED TO INTERMITTENTLY ENGAGE SUCH A RECORDING CARRIER, EXTENDING BETWEEN SAID CLAMPING DEVICES, OPERATIVE TO FORM A LOOP IN SAID CARRIER PERPENDICULARLY TO THE ADVANCING MOVEMENT OF THE LATTER, SAID CAM BEING ARRANGED TO PRODUCE SUCH A LOOP WHEN SAID CLAMPING DEVICES ARE IN ONE OF THEIR ALTERNATE OPERATIVE POSITIONS, A GUIDE MEMBER DISPOSED ADJACENT SAID CAM FOR GUIDING SAID RECORDING CARRIER, SAID GUIDE MEMBER HAVING A RECESS THEREIN DISPOSED OPPOSITE SAID CAM AND OF A SIZE TO RECEIVE A PORTION OF THE LATTER, SAID RECESS HAVING A PORTION WHICH IS UNIFORMLY SPACED FROM THE AXIS OF SAID CAM AND WHICH EXTENDS OVER AN ANGLE OF GENERATION WHICH IS LESS THAN THE ANGLE OF GENERATION OF THE UNIFORM HIGH PORTION OF SAID CAM.