D. c. motor for position control with dynamic and mechanical braking

Claim 1

A CONTROL ARRANGEMENT FOR A MACHINE OF THE CLASS DESCRIBED HAVING A DRIVE MOTOR AND A ROTATABLE SHAFT TO EFFECT ROTATION OF THE SHAFT A PREDETERMINED NUMBER OF REVOLUTIONS IN ONE DIRECTION AND FOR STOPPING THE SHAFT IN A PRESELECTED ROTATIONAL END AND START POSITION IN THE LAST REVOLUTION OF SAID PREDETERMINED NUMBER OF REVOLUTIONS COMPRISING, DYNAMIC BRAKING MEANS POSITIONED TO SELECTIVELY APPLY A RETARDING FORCE TO SAID SHAFT TO SUBSTANTIALLY REDUCE TO MOMENTUM THEREOF, MECHANICAL BRAKING MEANS POSITIONED TO SELECTIVELY APPLY A STOPPING FORCE TO SAID SHAFT, AND A CONTROL SYSTEM COMPRISING CIRCUIT MEANS AFFORDING ELECTRICAL CIRCUITS FOR EFFECTING ACTUATION OF SAID DRIVE MOTOR, SAID DYNAMIC BRAKING MEANS AND SAID MECHANICAL BRAKING MEANS, MEANS FOR ADJUSTING THE PREDETERMINED NUMBER OF REVOLUTIONS OF SAID SHAFT, MEANS OPERATIVE DURING SAID LAST REVOLUTION OF SAID SHAFT TO INTERRUPT THE CIRCUIT FOR SAID DRIVING MOTOR AND TO CONTROL SAID CIRCUIT OF SAID DYNAMIC BRAKING MEANS TO APPLY THE SAME AND REDUCE THE MOMENTUM OF SAID SHAFT, AND SAID LAST NAMED MEANS INCLUDING MEANS TO CONTROL SAID CIRCUIT OF SAID MECHANICAL BRAKING MEANS TO APPLY THE LATTER AND BRAKE SAID SHAFT DURING SAID LAST REVOLUTION THEREOF AFTER THE EXPIRATION OF A PREDETERMINED INTERVAL FOLLOWING THE APPLICATION OF SAID DYNAMIC BRAKING MEANS TO SAID SHAFT TO THEREBY STOP SAID SHAFT AT SAID PRESELECTED ROTATIONAL END AND START POSITION, AND MEANS TO CLOSE SAID CIRCUIT FOR SAID DRIVING MOTOR AND TO CONTROL SAID CIRCUITS OF AND RELEASE SAID DYNAMIC BRAKING MEANS AND SAID MECHANICAL BRAKING MEANS TO PROVIDE FOR FLEECTING ROTATION OF SAID SHAFT IN SAID ONE DIRECTION FROM SAID END AND START POSITION.