Involute checker

Claim 1

IN A GEAR CHECKING MACHINE COMPRISING A BASE, A BASE ROLL, MEANS MOUNTING SAID BASE ROLL FOR ROTATION IN A FIXED POSITION ON SAID BASE, A MAIN SLIDE MOVABLE ON SAID BASE TOWARD AND AWAY FROM SAID BASE ROLL, A CROSS SLIDE ON SAID MAIN SLIDE MOVABLE THEREON TRANSVERSELY OF SAID BASE ROLL, SAID CROSS SLIDE HAVING A PLANE ROLL DRIVE SURFACE THEREON, AN ACTUATOR FOR MOVING SAID MAIN SLIDE TOWARD AND AWAY FROM SAID BASE ROLL, SAID ACTUATOR COMPRISING A FEED SCREW AND NUT ASSEMBLY, AND RESILIENT MEANS CONNECTING SAID ASSEMBLY BETWEEN SAID BASE AND SAID MAIN SLIDE, BALANCE MECHANISM ON SAID BASE ENGAGEABLE WITH THE SIDE OF SAID BASE ROLL OPPOSITE SAID CROSS SLIDE, SAID BALANCE MECHANISM INCLUDING BASE ROLL ENGAGING MEANS MOVABLE TOWARD AND AWAY FROM SAID BASE ROLL, AND CONNECTIONS BETWEEN SAID ACTUATOR AND SAID BALANCE MECHANISM EFFECTIVE TO MOVE SAID ROLL ENGAGING MEANS TOWARD AND AWAY FROM SAID BASE ROLL AS SAID MAIN SLIDE IS MOVED TOWARD AND AWAY FROM SAID BASE ROLL, SAID BALANCE MECHANISM COMPRISING A BALANCE SLIDE MOVABLE ON SAID BASE, A PAIR OF ARMS PIVOTED TO SAID BASE, SAID ROLL ENGAGING MEANS COMPRISING ROLLERS ON SAID ARMS, AND ACTUATING CONNECTIONS BETWEEN SAID BALANCE SLIDE AND SAID ARMS, SAID ACTUATING CONNECTIONS COMPRISING A PIVOTED EQUALIZER BAR ON SAID BALANCE SLIDE AND CONNECTIONS BETWEEN SAID BAR AND BOTH OF SAID ARMS TO SWING SAID ARMS UPON MOVEMENT OF SAID BALANCE SLIDE.