Tape recorder automatic block selector

Claim 1

IN A TAPE RECORDER, A SELECTOR MECHANISM FOR SELECTING A DESIRED POINT ON SAID TAPE FROM A PLURALITY OF POINTS DEFINED BY MARKS ALONG THE LENGTH OF SAID TAPE COMPRISING SUPPORTING STRUCTURE, A FIRST ROTATABLE MEMBER CARRIED ON SAID STRUCTURE AND DRIVEN IN SYNCHRONISM WITH SAID TAPE SO AS TO MAKE NOT MORE THAN ONE COMPLETE REVOLUTION DURING THE TRAVERSE OF THE WHOLE LENGTH OF SAID TAPE, A SECOND MEMBER CARRIED BY SAID FIRST MEMBER AND ROTATABLE THEREWITH, MEANS FOR ADJUSTING THE ROTATIONAL POSITION OF SAID SECOND MEMBER WITH RESPECT TO SAID FIRST MEMBER, INDICATING MEANS ASSOCIATED WITH SAID ADJUSTING MEANS FOR PRESELECTING SAID POINT ON SAID TAPE, A SWITCH MOUNTED ON SAID STRUCTURE, MEANS TO ACTUATE SAID SWITCH CARRIED ON SAID SECOND MEMBER, AND A SENSING DEVICE RESPONSIVE TO SAID MARKS ON SAID TAPE, SAID SWITCH BEING CONNECTED IN CIRCUIT WITH SAID SENSING DEVICE TO ALERT SAID SENSING DEVICE WHEN SAID SWITCH IS ACTUATED, SAID ACTUATING MEANS BEING SO POSITIONED WITH RESPECT TO SAID SECOND MEMBER THAT SAID SENSING DEVICE IS ALERTED WHEN SAID POINT IS BEING APPROACHED, AND SAID SENSING DEVICE PRODUCES A SIGNAL WHEN SAID POINT IS REACHED.