Patent ID: 6951177

Claim:
A buttonhole sewing machine, comprising a base plate ( 2 ), a top arm ( 1 ) and a standard ( 3 ) uniting the arm ( 1 ) and the base plate ( 2 ); a needle ( 6 ) movable in up and down reciprocation; at least one work piece clamp ( 9 a , 9 b ) displaceable in a y direction; a buttonhole cutting device ( 13 ), which is disposed downstream of the work piece clamp ( 9 a , 9 b ) seem from the needle ( 6 ) in the y direction, which has a knife ( 36 ) that is disposed on the base plate ( 2 ), having a straight cutting edge ( 37 ) that extends in the y direction and an eye cutting edge ( 38 ) on one end, a cutting block ( 15 ) which cooperates with the knife ( 36 ), and a cutting drive ( 16 ) for displacement of the cutting block ( 15 ) in a vertical z direction towards the knife ( 36 ); characterized in that the knife ( 36 ) and the cutting block ( 15 ) are motor-adjustable one relative to the other in the y direction.