Thread cutting mechanism for a sewing machine

A thread cutting mechanism, for attachment to the body of a sewing machine, comprising, in combination:

• i. a cylindrical tube open at both ends
• ii. a bracket having a first end and a second end, said bracket being secured at said first end to the cylindrical tube, said second end being intended for securing to the body of the sewing machine
• iii. an operating rod disposed within said tube and having a first screwthreaded end projecting from one end of said tube and a second end projecting from the other end of said tube, said rod being freely slidable in said tube,
• iv. guiding and limiting means comprising a longitudinal guide recess and a lug engaged in said guide recess, the guide recess and the lug being provided one on one item of the assembly of tube and rod and the other on the other item of the assembly of tube and rod,
• v. spring means positioned within said tube and acting between said tube and said rod to urge said rod into a first limiting position of longitudinal sliding determined by said guiding and limiting means,
• vi. a cutter support member having a first end and a second end, said member having at said first end a threaded hole by which the member is engaged on the threaded end of the rod, said member having an elongated slot extending longitudinally from said second end, said member having two longitudinally spaced securing means extending transversely to said elongated slot, and
• vii. a cutter having a cutting edge, said cutter including a blade portion having two elongated holes positioned to correspond to the securing means of the support member, thereby to permit adjustment of the cutter longitudinally in the support member, and securing of the cutter in a predetermined position of adjustment.