Automatic gear checker for internal gears

Claim 1

APPARATUS FOR USE WITH AN INTERNAL GEAR HAVING A SMOOTH OUTER PERIPHERY, SAID APPARATUS HAVING AN IMAGINARY CENTER LINE, IN WHICH THE INTERNAL GEAR IS MOUNTED WITH ITS AXIS COINCIDENT WITH THE CENTER LINE, THREE ROTARY PINION SUPPORTS FOR SUPPORTING PINIONS IN A COMMON PLANE COINCIDENT WITH THE PLANE OF THE GREAR AND ADAPTED TO MESH THEREWITH, PINIONS ON SAID SUPPORTS, MEANS MOUNTING TWO OF SAID SUPPORTS IN FIXED OPERATIVE POSITION AND MOUNTING SAID OTHER SUPPORT FOR MOVEMENT IN SAID PLANE RADIALLY WITH RESPECT TO THE CENTER LINE, SAID SUPPORTS BEING SPACED SUBSTANTIALLY EQUIDISTANT FROM SAID CENTER LINE, A DRIVE ROLLER ENGAGEABLE WITH THE SMOOTH OUTER PERIPHERY OF THE INTERNAL GEAR AT A POINT INTERMEDIATE GEAR AND PINIONS CARING ENGAGEMENT BETWEEN THE INTERNAL GEAR AND PINIONS CARRIED BY SAID TWO SUPPORTS, SAID ROLLER BEING IN FRICTIONAL DRIVING ENGAGEMENT WITH THE INTERNAL GEAR, AND MEANS FOR DRIVING SAID ROLLER IN ROTATION ONE OF SAID PINION SUPPORTS BEING MOUNTED FOR ANGULAR MOVEMENT ABOUT AN AXIS EXTENDING RADIALLY WITH RESPECT TO THE AFORESAID CENTER LINE, AND MEANS FOR MEASURING ANGULAR MOVEMENT OF SAID LAST MENTIONED PINION SUPPORT DURING ROTATION OF THE INTERNAL GEAR.