Patent ID: 6684798
Filing Date: 2004-02-03
Classification: B26D,D05B,D05D,F15B,Y10T

Abstract:
A buttonhole sewing machine, comprisinga needle (7) which is drivable in up and down reciprocation; at least one work piece clamp (12a, 12b) which is displaceable in a y direction; a buttonhole cutting device (16), which is disposed downstream of the needle (7) in the y direction, which comprises a knife (26, 26â€²), which comprises a cutting block (42, 43) that cooperates with the knife (26, 26â€²), and a cutting drive (19, 19â€²) for motion of the knife (26, 26â€²) and the cutting block (42, 43) relative to each other by variable cutting force; wherein the cutting drive (19, 19â€²) includes several linear drives, which are connected in parallel; and which are pneumatically actuated selectively.