Feed adjusting and reversing mechanism for sewing machines

Claim 1

IN A SEWING MACHINE HAVING A FRAME, AN ACTUATING MEANS IN SAID FRAME INCLUDING A ROTARY SHAFT FOR ACTUATING A WORK FEEDING MECHANISM, A FEED DRIVE MEANS INCLUDING A FEED DRIVING ECCENTRIC, MEANS SUPPORTING SAID FEED DRIVING ECCENTRIC FOR ROTATION WITH SAID ROTARY SHAFT AND FOR SHIFTING MOVEMENT TRANSVERSELY OF SAID ROTARY SHAFT TO VARY THE ECCENTRICITY THEREOF, AN ECCENTRIC ADJUSTING MEMBER ROTATABLE WITH SAID SHAFT AND SLIDABLE LENGTHWISE THEREON, AN ECCENTRIC ENGAGING SURFACE ON SAID ADJUSTING MEMBER INCLINED RELATIVELY TO SAID ROTARY SHAFT, A RADIAL ABUTMENT ELEMENT FIXED FOR ROTATION AND LENGTHWISE SLIDING MOVEMENT WITH SAID ECCENTRIC ADJUSTING MEMBER, OPERATOR INFLUENCED MEANS FOR SHIFTING SAID ECCENTRIC ADJUSTING MEMBER LENGTHWISE RELATIVELY TO SAID ROTARY SHAFT FOR REVERSING THE DIRECTION OF FEED, AND MEANS FOR LIMITING THE LENGTHWISE SLIDING MOVEMENT OF SAID RADIAL ABUTMENT ELEMENT AND SAID ECCENTRIC ADJUSTING MEMBER COMPRISING MEANS FIXED RELATIVELY TO SAID ROTARY SHAFT AND HAVING ADJACENT PORTIONS FORMED WITH SCREW THREADS OF THE OPPOSITE HAND, A PAIR OF STOP NUTS DISPOSED ONE AT EACH SIDE OF SAID RADIAL ABUTMENT ELEMENT AND THREADEDLY ENGAGED EACH WITH ONE OF SAID PORTIONS FORMED WITH SCREW THREADS OF THE OPPOSITE HAND, AND OPERATOR INFLUENCED MEANS FOR RESTRAINING SAID STOP NUTS FROM ROTATION WITH SAID ROTARY SHAFT AND THUS MOVE THE STOP NUTS LENGTHWISE RELATIVELY TO SAID ROTARY SHAFT AND VARY THE LIMITS OF LENGTHWISE MOTION OF SAID RADIAL ABUTMENT MEMBER AND SAID ECCENTRIC ADJUSTING MEMBER.