Electric driving device for sewing machines or the like

Claim 1

IN A SEWING MACHINE HAVING AN ELECTRIC MOTOR, A ROTATABLE SHAFT AND BRAKE MEANS OPERATIVELY RELATED TO SAID SHAFT, CONTROL MEANS FOR OPERATING BRAKE MEANS TO STP SAID MOTOR IN A PREDETERMINED POSITON, SAID CONTROL MEANS COMPRISING AN ELECTROMAGNETIC COIL MOUNTED AROUND SAID SHAFT FOR CONTROLLING SAID BRAKE MEANS, A LINE POWER SUPPLY CIRCUIT AND A MOTOR POWER CIRCUIT A TRANSFORMER, AN ADJUSTABLE STARTER INCLUDING A PLURALITY OF REGULATING RESISTANCES ADAPTED TO BE SHORT CIRCUITED STEP-BY-STEP OPERABLE IN SEQUENCE ONE AFTER THE OTHER IN CONNECT SAID SUPPLY CIRCUIT TO SAID MOTOR POWER CIRCUIT AND INCLDUING A PAIR OF CONTACTS IN THE CIRCUIT OF SAID TRANSFORMER ADAPTED TO CONNECT SAID TRANSFORMER TO SAID POWER SUPPLY CIRCUIT, A CONTROL PEDAL OPERATIVE ALTERNATIVELY TO SHORT CIRCUIT SAID RESISTANCES AND TO CONNECT SAID CONTACTS, A RELAY CONNECTED PARALLEL TO SAID COIL AND HAVING A PAIR OF CONTACTS IN A CIRCUIT ACROSS SAID STATER, A RECTIFIER BRIDGE CIRCUIT CONNECTED TO SAID TRANSFORMER ADAPTED TO SUPPLY DIRECT CURRENT TO SAID COIL AND TO SAID RELAY, A TRANSISTOR HAVING AN EMITTER CONNECTED TO SAID BRIDGE CIRCUIT AND A COLLECTOR CONNECTED TO SAID COIL, A LIGHT SOURCE SUPPLIED WITH CURRENT BY SAID TRANSFORMER, A CENTRIFUGAL SWITCH MOUNTED FOR MOVEMENT WITH SAID SHAFT AND CONNECTED INTERMEDIATE SAID COIL AND THE BASE OF SAID TRANSISTOR, A REFECTOR SUCH AS A MIRROR PROVIDED ON A MOVABLE PART OF SAID MACHINE, AND A PHOTO TRANSISTOR OPERATIVELY DISPOSED IN RELATION TO SAID REFLECTOR AND TO SAID LIGHT SOURCE AND CONNECTED TO SAID COIL AND TO SAID TRANSISTOR BASE AND SHUNTED ACROSS SAID CENTRIFUGAL SWITCH.