Sewing installation for the production of a piped pocket opening

A sewing installation for the production of a piped pocket opening (98, 101) on a workpiece (31), comprising

• a working plate (2);
• a two-needle sewing machine (3) disposed on the working plate (2);
• a workpiece advancing device (26) for the transport of the workpiece (31) in a Y-direction on the working plate (2);
• a knife (11) for the production of a straight incision (103) running in the Y-direction in the workpiece (31) during the transport thereof in the Y-direction;
• a cutout (41) running in the Y-direction in the working plate (2);
• a cutting device (44) for the production of corner cuts (96, 97;
• 99, 100) in the workpiece (31), which cutting device (44)
• is disposed underneath the cutout (41) of the working plate (2),
• comprises a first and a second cutting unit (52, 53), which are adjustable relative to each other in the Y-direction, and
• a drive (54) for the adjustment relative to each other of the first and the second cutting unit (52, 53);
• a first corner cutting knife (43), which is disposed on the first cutting unit (52), and a second corner cutting knife (42), which is disposed on the second cutting unit (53), each of the first and second corner cutting knives (43, 42) comprising
• a first knife (82),
• a second knife (83), and
• a cutting point (87),
• at least one knife (82, 83) being adjustable in a pivot guide to pivot about an axis (76) which intersects the cutting point (87) and runs in an X-direction;
• at least one drive (71) disposed on the first and the second cutting unit (52, 53) for the displacement of the corner cutting knives (42, 43) by a uniform stroke in a Z-direction through the cutout (41) in the working plate (2) and through the workpiece (31) resting thereon;
• at least one drive (66, 67) disposed on each cutting unit (52, 53) for the pivotal adjustment of at least one knife (82, 83) relative to the cutting unit (52, 53);
• and
• a control unit for triggering the drives (54, 66, 67, 71).