Motor drive and needle positioning mechanism for sewing machines

Claim 1

MOTOR DRIVE AND NEEDLE POSITIONING MECHANISM FOR A SEWING MACHINE COMPRISING IN COMBINATION: (1) A DRIVE SHAFT AND A DRIVEN SHAFT OF SAID MACHINE, (2) A DRIVING MOTOR, (3) MAIN TRANSMISSION MEANS BETWEEN SAID MOTOR AND SAID DRIVEN SHAFT INCLUDING MAIN COUPLING MEANS HAVING A MAIN DRIVING MEMBER CONNECTED TO SAID MOTOR AND A MAIN DRIVEN MEMBER OPERABLE INTO AND OUT OF ENGAGEMENT WITH SAID DRIVING MEMBER, (4) AN OPERATING MEMBER FOR SAID MAIN COUPLING MEANS OPERABLE FROM A REST POSITION IN A FIRST DIRECTION, TO START AND STOP SAID MACHINE FOR THE CARRYING OUT OF A SEWING OPERATION, AND BEING OPERABLE IN A SECOND OPPOSITE DIRECTION BEYOND SAID REST POSITION, (5) AUXILIARY TRANSMISSION MEANS OPERABLY CONNECTED BETWEEN SAID MOTOR AND SAID DRIVEN SHAFT INCLUDING AUXILIARY COUPLING MEANS HAVING AN AUXILIARY DRIVING MEMBER AND AN AUXILIARY DRIVEN MEMBER OPERABLE INTO AND OUT OF ENGAGEMENT WITH SAID AUXILIARY DRIVING MEMBER, (6) REDUCTION GEARING MEANS CONNECTING SAID MOTOR WITH SAID AUXILIARY DRIVING MEMBER, TO ROTATE THE LATTER AT A REDUCED SPEED COMPARED WITH THE SPEED OF SAID MAIN DRIVING MEMBER, (7) AN ELECTRICAL ACTUATING DEVICE FOR SAID AUXILIARY DRIVEN MEMBER, (8) AN ELECTRICAL CONTROL CIRCUIT INCLUDING A CURRENT SOURCE, SAID ACTUATING DEVICE, A NORMALLY CLOSED CONTROL SWITCH, A TWO-POSITION CHANGE-OVER SWITCH HAVING A FIRST AND A SECOND CHANGE-OVER CONTACT, AND A CONTACT DEVICE, (9) SAID CONTACT DEVICE INCLUDING A ROTARY CONTACT HAVING AN INSULATING SEGMENT AND DRIVEN BY SAID SHAFT, AND A PAIR OF STATIONARY CONTACTS COOPERATING WITH SAID ROTARY CONTACT AND CONNECTED EACH TO ONE OF SAID CHANGE-OVER CONTACTS, WHEREBY TO INTERRUPT SAID CIRCUIT BY SAID INSULATING SEGMENT AND TO STOP SAID MACHINE AT PREDETERMINED FIRST AND SECOND NEEDLE POSITIONS DETERMINED BY THE POSITIONS OF SAID STATIONARY CONTACTS, AND (10) ACTUATING MEANS TO ACTUATE SAID CONTROL AND CHANGE-OVER SWITCHES OPERATED BY SAID OPERATING MEMBER, TO OPEN SAID CONTROL SWITCH AND TO CLOSE SAID FIRST CHANGE-OVER CONTACT DURING OPERATION OF SAID OPERATING MEMBER IN SAID FIRST DIRECTION, TO CLOSE BOTH SAID CONTROL SWITCH AND SAID FIRST CHANGE-OVER CONTACT IN THE REST POSITION OF SAID OPERATING MEMBER, AND TO CLOSE BOTH SAID CONTROL SWITCH AND SAID SECOND CHANGE-OVER CONTACT UPON OPERATION OF SAID MEMBER IN SAID SECOND DIRECTION, WHEREBY TO RE-START AND STOP SAID MACHINE BY SAID AUXILIARY TRANSMISSION MEANS AT SAID FIRST PREDETERMINED NEEDLE POSITION UPON RETURN OF SAID OPERATING MEMBER TO ITS REST POSITION AT THE END OF A SEWING OPERATION, AND TO RE-START AND STOP SAID MACHINE AT SAID SECOND PREDETERMINED NEEDLE POSITION UPON OPERATION OF SAID OPERATING MEMBER IN SAID SECOND DIRECTION BEYOND SAID REST POSITION, RESPECTIVELY.