Pulse operated clutch and brake for controlling speed of driven member

Claim 1

CONTROLLABLE APPARATUS COMPRISING: CONTINUOUS DRIVE MEANS; MOVABLE MEANS HAVING A SERIES OF OPENINGS, SAID MOVABLE MEANS TO BE INTERMITTENTLY DRIVEN BY SAID DRIVE MEANS; A DRIVE COIL AND COUPLING ARRANGEMENT INTERCONNECTING SAID DRIVE MEANS AND SAID MOVABLE MEANS TO DRIVE SAID MOVABLE MEANS WHEN SAID DRIVE COIL IS ENERGIZED; A BRAKE COIL AND BRAKING ARRANGEMENT, SAID BRAKING ARRANGEMENT TO INTERMITTENTLY ENGAGE SAID MOVABLE MEANS TO BRAKE SAID MOVABLE MEANS WHEN SAID BRAKE COIL IS ENERGIZED; A SOURCE OF SYNCHRONIZING PULSES; A LIGHT SOURCE DISPOSED ON ONE SIDE OF SAID MOVABLE MEANS OPENINGS, AND A PHOTOELECTRIC TRANSISTOR DISPOSED TO RECEIVE LIGHT THROUGH SAID OPENINGS FROM SAID LIGHT SOURCE TO PRODUCE A BRAKE PULSE; AND A CONTROL CIRCUIT RESPONSIVE TO SAID SYNCHRONIZING PULSES FOR SELECTIVELY ENERGIZING SAID DRIVE COIL TO CAUSE SAID COUPLING ARRANGEMENT TO INTERCONNECT SAID DRIVE MEANS AND SAID MOVABLE MEANS TO DRIVE SAID MOVABLE MEANS, THE SAID CIRCUIT BEING RESPONSIVE TO SAID BRAKE PULSES TO SELECTIVELY ENERGIZE SAID BRAKE COIL AND DE-ENERGIZE SAID DRIVE COIL CAUSING SAID BRAKING ARRANGEMENT TO BRAKE SAID MOVABLE MEANS, WHEREBY, THE SPEED OF MOVEMENT OF SAID MOVABLE MEANS IS DETERMINED BY THE RATIO OF SYNCHRONIZING TO BRAKE PULSES.