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US 6,684,798 B2Granted
Buttonhole sewing machine
AssigneeDurkopp Adler Aktiengesellschaft
InventorsKarsten Filges, Theodor Janocha, Jochen Fischer
Life of this patent
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Abstract
A buttonhole sewing machine comprises a buttonhole cutting device which includes a knife and at least one cutting block that cooperates with the knife. Provision is made for a cutting drive for motion of the knife and the cutting block relative to each other by variable cutting force, the cutting drive comprising several linear drives which are connected in parallel and pneumatically actuated selectively.
Claims7
A buttonhole sewing machine, comprising
- a 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, 26′),
- which comprises a cutting block (42, 43) that cooperates with the knife (26, 26′), and
- a cutting drive (19, 19′) for motion of the knife (26, 26′) and the cutting block (42, 43) relative to each other by variable cutting force;
- wherein the cutting drive (19, 19′) includes several linear drives,
- which are connected in parallel;
- and
- which are pneumatically actuated selectively.
8 more elements
Dependencies are inferred from the claim text.