Zigzag sewing machine with a manually operable device for the making of buttonholes

Claim 1

A ZIGZAG SEWING MACHINE HAVING A BUTTONHOLE ATTACHMENT FOR SELECTIVELY CONTROLLING OPERATING ELEMENTS OF THE SEWING MACHINE, SAID ATTACHMENT COMPRISING A PLURALITY OF MANUALLY ROTATABLE CAMS, FEELERS ENGAGED WITH SAID CAMS, AND LEVERS CONNECTED TO SAID FEELERS FOR MOVEMENT THEREBY AND FOR EFFECTING THE REQUIRED CONTROL ON THE SEWING MACHINE OPERATING ELEMENTS TO EFFECT THE SEWING OF BUTTONHOLES, SAID CAMS HAVING ALIGNED PORTIONS WHEN ENGAGED BY SAID FEELERS RENDERING SAID LEVERS INEFFECTIVE TO CONTROL THE SEWING MACHINE OPERATING ELEMENTS AND PERMITTING THE NORMAL CONTROL THEREOF BY OTHER CONTROL MEANS OF THE SEWING MACHINE, SAID ATTACHMENT INCLUDING A HANDLE FOR CONTROLLING THE POSITION OF SAID CAMS, SAID HANDLE BEING REMOVABLE WHEREBY THE APPEARANCE OF THE SEWING MACHINE IS NOT DETRACTED FROM BY THE ADDITION OF SAID ATTACHMENT, SAND MEANS RELEASABLY INTERCONNECTING SAID HANDLE AND SAID CAMS FOR ALLOWING REMOVAL OF SAID HANDLE FROM SAID CAMS ONLY WHEN SAID CAMS ARE IN THEIR INEFFECTIVE POSITION.