Reverse current motor circuit including dynamic braking

Claim 1

A TWO-CHANNEL CONTROL CIRCUIT FOR EFFECTING THE SELECTIVE ACTUATION OF A DIRECT CURRENT MOTOR IN EITHER A FORWARD OR A REVERSE DIRECTION IN RESPONSE TO AN INPUT SIGNAL BEING APPPLIED TO ONE OR THE OTHER OF SAID CHANNELS FOR EFFECTING THE AUTOMATIC AND IMMEDIATE BRAKING OF SAID MOTOR WHEN THE DESIRED ACTUATION THEREOF HAS BEEN EFFECTED AND IN RESPONSE TO THE TERMINATION OF AN INPUT SIGNAL THAT HAS BEEN SUPPLIED TO ONE OF SAID CHANNELS, AND FOR PRECLUDING SAID MOTOR FROM BEING OPERATED IN THE ABSENCE OF AN INPUT SIGNAL BEING SUPPLIED TO ONE OR THE OTHER OF SAID CHANNELS OR WHEN INPUT SIGNALS ARE SIMULTANEOUSLY SUPPLIED TO BOTH OF SAID CHANNELS; WHICH CONTROL CIRCUIT COMPRISES A SINGLE POLARITY SOURCE OF POTENTIAL; MEANS DEFINING A FIRST MOTOR DRIVE CURRENT SUPPLYING CIRCUIT BETWEEN SAID SINGLE POLARITY SOURCE OF POTENTIAL AND SAID MOTOR; SAID FIRST CIRCUIT DEFINING MEANS INCLUDING A FIRST AMPLIFIER CIRCUIT AND A FIRST SWITCHING CIRCUIT; MEANS DEFINING A SECOND MOTOR DRIVE CURRENT SUPPLYING CIRCUIT BETWEEN SAID SINGLE POLARITY SOURCE OF POTENTIAL AND SAID MOTOR; SAID SECOND CICUIT DEFINING MEANS INCLUDING A SECOND AMPLIFIER CIRCUIT AND A SECOND SWITCHING CIRCUIT; SAID FIRST AND SECOND CIRCUIT DEFINING MEANS BEING RESPONSIVE TO AN INPUT SIGNAL SUPPLIED TO ONE OF SAID CHANNEL TO DRIVE SAID MOTOR IN A FIRST DIRECTION FOR THE DURATION OF SAID INPUT SIGNAL AND RESPONSIVE TO AN INPUT SIGNAL SUPPLIED TO THE OTHER OF SAID CHANNELS TO DRIVE SAID MOTOR IN A SECOND AND REVERSE DIRECTION; A FIRST VARIABLE IMPEDANCE BRAKING NETWORK CONNECTED IN CIRCUIT WITH SAID MOTOR AND INCLUDING AT LEAST A PORTION OF SAID FIRST SWITCHING CIRCUIT; AND SECOND VARIABLE IMPEDANCE BRAKING NETWORK CONNECTED IN CIRCUIT WITH SAID MOTOR AND INCLUDING AT LEAST A PORTION OF SAID SECOND SWITCHING CIRCUIT; SAID VARIABLE IMPEDANCE BRAKING NETWORKS PROVIDING ESSENTIALLY AN OPEN CIRCUIT CONDITION TO SAID MOTOR WHEN ONE OF SAID MOTOR DRIVE CURRENT SUPPLYING CIRCUITS IS COMPLATED IN RESPONSE OF ONE OF SAID AMPLIFIER CIRCUITS BEING RENDERED EFFECTIVE; SAID BRAKING NETWORKS PROVIDING ESSENTIALLY A SHORT CIRCUIT CONDITION ACROSS SAID MOTOR DUE TO THE GENERATOR ACTION OF SAID MOTOR BOTH UPON TERMINATION OF AN INPUT SIGNAL AND WHEN SAID MOTOR IS EXTERNALLY ACTUATED IN EITHER A FORWARD OR REVERSE DIRECTION IN THE ABSENCE OF AN INPUT SIGNAL.