Sewing machine control system

Claim 1

IN A SEWING MACHINE INCLUDING A NEEDLE, A MECHANSIM FOR OPERATING SAID NEEDLE, DRIVE MEANS FOR SAID MECHANISM, AND A PRESSURE FOOT OPERABLE FROM A RELEASED POSITION TO A NORMALLY RESILIENTLY BIASED FABRIC-HOLDING POSITION, AN OPERATOR''S CONTROL MOVABLE FROM A NORMAL POSITION THROUGH AN INTERMEDIATE POSITION TO AN OPERATING POSITION, FIRST FLUID MEANS CONNECTED TO SAID CONTROL AND TO SAID PRESSURE FOOT REGULATING THE MOVEMENT OF SAID PRESSURE FOOT TO SAID FABRIC-HOLDING POSITION IN RESPONSE TO MOVEMENT OF SAID CONTROL FROM SAID NORMAL POSITION TO SAID INTERMEDIATE POSITION AND FOR OPERATING SAID PRESSURE FOOT TO SAID RELEASED POSITION IN RESPONSE TO MOVEMENT OF SAID CONTROL FROM SAID INTERMEDIATE POSITION TOWARD SAID NORMAL POSITION, SECOND FLUID MENS CONNECTED TO SAID OPERATOR''S CONTROL AND SAID DRIVE MEANS REGULATING THE MOVEMENT OF SAID DRIVE MEANS IN RESPONSE TO MOVEMENT OF SAID CONTROL TO SAID OPERATING POSITION FROM A NORMALLY RESILIENTLY BIASED NON-OPERATING POSITION AND FOR DEACTIVATING SAID DRIVE MEANS IN RESPONSE TO MOVEMENT OF SAID CONTROL FROM SAID OPERATING POSITION TOWARD SAID INTERMEDIATE POSITION AND FLUID INTERLOCK MEANS SEPARATE FROM SAID FIRST AND SECOND FLUID MEANS CONNECTED TO SAID SECOND FLUID MEANS RESPONSIVE TO ACTIVATION OF SAID PRESSURE FOOT REGULATING OPERATION OF THE DRIVE MEANS WHEREBY WHEN SAID PRESSURE FOOT IS IN THE RELEASED POSITION THE DRIVE MEANS IS HELD IN AN INOPERATIVE POSITION.