Actuator power supply

Claim 1

AN ELECTRICAL CIRCUIT FOR PROVIDING CURRENT PULSES FROM A SOURCE OF THE ACTUATING COIL OF A PINCH ROLER ACTUATOR OF A TAPE TRANSPORT SYSTEM, COMPRISING A STORAGE CAPACITOR, MEANS FOR CHARGING THE STORAGE CAPACITOR FROM THE SOURCE INCLUDING AN INDUCTOR AND A UNIDIRECTIONAL DEVICE CONNECTED TO SERIES BETWEEN SAID SOURCE AND THE STORAGE CAPACITOR, SAID INDUCTOR HAVING AN INDUCTANCE VALUE RELATIVE TO THE CAPACITANCE VALUE OF THE STORAGE CAPACITOR FOR SUSTAINING THE FLOW OF CHARGING CURRENT THROUGH SAID UNIDIRECTIONAL DEVICE FOR AN INTERVAL AFTER THE STORAGE CAPACITOR HAS BEEN CHARGED TO A VOLTAGE EQUAL TO THAT OF SAID SOURCE, A SECOND UNIDIRECTIONAL DEVICE CONNECTED BETWEEN THE CAPACITOR AND THE ACTUATING COIL TO PASS THE CURRENT FROM THE CAPACITOR TO THE ACTUATING COIL TO ACTUATE THE PINCH ROLLER ACTUATOR, AND SWITCH MEANS FOR SELECTIVELY CONNECTING THE SOURCE THROUGH THE INDUCTOR IN THE FIRST UNIDIRECTIONAL DEVICE TO CHARGE THE STORAGE CAPACITOR DURING A FIRST INTERVAL AND COMPLETING THE CIRCUIT BETWEEN THE CHARGED STORAGE CAPACITOR AND THE ACTUATING COIL THROUGH THE SECOND UNIDIRECTIONAL DEVICE DURING A SECOND INTERVAL TO OPERATE THE PINCH ROLLER ACTUATOR.