Sewing machine
AssigneePFAFF Industriesysteme und Maschinen GmbH
InventorsHarald Kallenbach, Berthold Becker, Stefan Samstag
Life of this patent
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Abstract
A sewing machine has seam-forming tools, comprising a needle for guiding an upper thread and a looper. The needle is designed as a curved needle which is pivotable about a needle pivot axis. This embodiment is such that a distance of the curved needle from the pivot axis is equal to a radius of a curve of the curved needle about the pivot axis. The looper is designed as a looper which is rotatable about a looper rotational axis and has a lower thread reserve. The looper rotational axis runs parallel to a sewing material support region. The sewing machine can be used to produce a durable seam.
Claims11
A sewing machine (1) having seam-forming tools (6), comprising a needle (7) for guiding an upper thread (8) and a looper (9),
- wherein the needle (7) is a curved needle (7) which is pivotable about a needle pivot axis (10),
- wherein a distance (A) of the curved needle (7) from the pivot axis (10) is equal to a radius (r) of a curve of the curved needle (7) about the pivot axis (10),
- wherein the looper (9) is rotatable about a looper rotational axis (15) and has a lower thread reserve (16),
- wherein the looper rotational axis (15) runs parallel to a sewing material support region (12),
- wherein the sewing material support region (11) is arranged with respect to a movement path (13) of the curved needle (7) such that the curved needle (7), during a sewing movement along the movement path (13),
- penetrates into a first piece (2) of a sewing material (4) to be sewn from a sewing material side (14),
- exits the first piece (2) and enters a second piece (3) of the sewing material (4) along an abutting edge (5), and
- exits the second piece (3) of the sewing material (4) on the sewing material side (14),
- whereby the first piece (2) and the second piece (3) of the sewing material are sewn to one another by abutting-edge sewing with a single-sided double lockstitch.
Dependencies are inferred from the claim text.