Positional control systems

Claim 1

A CONTROL MECHANISM FOR THE STOPPING OF ELECTRICALLY DRIVEN SEWING MACHINES IN ONE OR MORE PREDETERMINED POSITIONS OF THE NEEDLE BAR, COMPRISING A MOTOR (17) FOR DRIVING THE SEWING MACHINE, BRAKE MEANS (15) FOR STOPPING THE SEWING MACHINE, MANUALLY CONTROLLED MEANS (18) FOR OPERATIVELY CONNECTING AND DISCONNECTING THE MOTOR TO AND FROM THE SEWING MACHINE, FIRST AND SECOND ELECTRICAL CIRCUITS, A SWITCH (36) CONNECTED IN THE FIRST CIRCUIT AND OPERATED BY THE MANUALLY CONTROLLED MEANS SO AS TO PERMIT THE ENERGIZATION OF THE FIRST CIRCUIR WHEN THE MOTOR IS OPERATIVELY DISCONNECTED FROM THE MACHINE, TIMEDELAY RELAY MEANS (42) IN THE FIRST CIRCUIT RESPONSIVE AFTER A TIME DELAY INITIATED BY THE OPERATION OF THE SWITCH TO PREPARE A SECOND CIRCUIT WHICH, WHEN CLOSED, APPLIES THE BRAKING MEANS, AND THE FIRST CIRCUIT INCLUDING MEANS (48) CONNECTED WITH POSITIVELY OPERATED PARTS OF THE SEWING MACHINE AND OPERATIVE IN RESPONSE TO PREDETERMINED ANGULAR POSITIONS OF THE PARTS FOR CLOSING THE SECOND CIRCUIT TO BRAKE THE MACHINE.