Tile size responsive apparatus and control

Claim 1

APPARATUS FOR SENSING WHENEVER OBJECTS SPACED APART ON A TRAVELLING CONVEYOR BY A PREDETERMINED DISTANCE ARE OUTSIDE OF TOLERANCES IN THICKNESS COMPRISING FIRST, SECOND AND THIRD PHOTOCELL SYSTEMS EACH INCLUDING A SOURCE OF LIGHT ENERGY AND A PHOTOCELL SPACED APART TRANSVERSE TO THE DIRECTION OF TRAVEL OF THE OBJECTS, THE FIRST PHOTOCELL SYSTEM BEING ALIGNED PARALLEL TO THE THICKNESS DIMENSION OF THE OBJECTS AND POSITIONED IN SUCH FASHION THAT THE OBJECTS PREVENT LIGHT FROM THE SOURCE FROM REACHING THE ASSOCIATED PHOTOCELL EXCEPT WHEN THE SPACING BETWEEN OBJECTS IS OPPOSITE SAID FIRST PHOTOCELL SYSTEM, THE SECOND AND THIRD PHOTOCELL SYSTEMS BEING ALIGNED TRANSVERSELY TO SAID THICKNESS DIMENSION SUFFICIENTLY REARWARDLY WITH RESPECT TO SAID DIRECTION OF TRAVEL THAT AN OBJECT IS POSITIONED BETWEEN THE LIGHT SOURCE AND THE PHOTOCELL OF EACH OF SAID SECOND AND THIRD PHOTOCELL SYSTEMS WHENEVER THE SPACING BETWEEN OBJECTS IS OPPOSITE SAID FIRST PHOTOCELL SYSTEM, WITH THE SECOND SYSTEM POSITIONED SUCH THAT LIGHT FROM THE SOURCE REACHES THE PHOTOCELL EXCEPT WHEN THE OBJECT IS THICKER THAN A FIRST PREDETERMINED LIMIT AND THE THIRD SYSTEM POSITIONED SUCH THAT LIGHT FROM THE SOURCE REACHES THE PHOTOCELL ONLY WHEN THE OBJECT IS THINNER THAN A SECOND PREDETERMINED LIMIT, AND MEANS CONNECTED TO EACH OF SAID PHOTOCELL SYSTEMS RESPONSIVE TO EACH INTERRUPTION OF THE LIGHT PATH OF SAID SECOND PHOTOCELL SYSTEM AND COMPLETION OF THE LIGHT PATH OF SAID THIRD PHOTOCELL SYSTEM ONLY WHEN THE LIGHT PATH OF SAID FIRST PHOTOCELL SYSTEM IS COMPLETED, SAID LAST-NAMED MEANS INCLUDING FIRST, SECOND AND THIRD THYRATRON TUBE CIRCUITS AND FIRST,