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.
Claims6
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 designed as a curved needle (7) which is pivotable about a needle pivot axis (10) in such a way that 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 designed as a looper (9) which is rotatable about a looper rotational axis (15) and having a lower thread reserve (16),
- wherein the looper rotational axis (15) runs parallel to a sewing material support region (12),
- wherein an arrangement of the sewing material support region (11) with respect to a movement path (13) of the curved needle (7) is such that the curved needle (7), during a sewing movement along the movement path (13), penetrates into sewing material (4) to be sewn from a sewing material side (14) and exits again on the same sewing material side (14),
- having a design such that the sewing material is sewn in the form of an abutting-edge sewing using a single-sided double lockstitch.
Dependencies are inferred from the claim text.