Automatic balancing arrangement for grinding wheels

Claim 1

IN AN ARRANGEMENT FOR THE STATIC AND DYNAMIC BALANCING OF GRINDING WHEELS ON GRINDING MACHINES, THE COMBINATION COMPRISING AN OSCILLATION IMBALANCE INDICATOR HAVING A DAMPED INDICATOR POINTER AND A TRAILING POINTER PUSHED BY SAID INDICATOR POINTER IN THE DIRECTION OF DECREASING IMBALANCE INDICATION, THERE BEING ENGAGEABLE ELECTRICAL CONTACTS ON SAID POINTERS, A FIRST ADJUSTING DRIVE FOR ADJUSTING THE RADIAL DIRECTION OF COUNTERWEIGHTS WITH RESPECT TO A GRINDING WHEEL, A SECOND ADJUSTING DRIVE FOR ADJUSTING THE QUANTITY OF THE COUNTERWEIGHTS, A THIRD ADJUSTING DRIVE FOR AXIALLY DISPLACING THE COUNTERWEIGHTS WITH RESPECT TO THE AXIS OF A GRINDING WHEEL, A REVERSIBLE SERVOMOTOR DRIVINGLY ENGAGEABLE WITH SAID ADJUSTING DRIVES, A CONTROL CIRCUIT FOR DRIVINGLY CONNECTING SAID FIRST ADJUSTING DRIVE TO SAID SERVOMOTOR, A SECOND CONTROL CIRCUIT INCLUDING A STEP SWITCH MECHANISM FOR REVERSING THE DIRECTION OF ROTATION OF SAID SERVOMOTOR AND FOR SUCCESSIVELY CONNECTING SAID SECOND AND THIRD ADJUSTING DRIVES TO SAID SERVOMOTOR, A THIRD CONTROL CIRCUIT CONNECTED TO SAID POINTER CONTACTS FOR ACTUATING SAID STEP SWITCH MECHANISM UPON SEPARATION OF SAID POINTER CONTACTS, AND MEANS ACTUATED BY A PREDETERMINED MINIMUM POSITION OF SAID TRAILING POINTER FOR TERMINATING THE BALANCING OPERATION.