Sewing installation for the production of a piped pocket opening

A sewing installation for the production of a lined pocket opening (141) on a workpiece (31, 140), 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, 140) in a Y-direction on the working plate (2);
• a knife (11) for the production of a straight incision (143, 156) running in the Y-direction in the workpiece (31, 140) 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 (135, 136;
• 138, 139) in the workpiece (31, 140), which cutting device (44)
• is disposed underneath the cutout (41) of the working plate (2),
• comprises a first and a second cutting unit (123, 124), which are adjustable relative to each other in the Y-direction, and
• a drive (121) for the adjustment relative to each other of the first and the second cutting unit (123, 124);
• a first corner cutting knife (43), which is disposed on the first cutting unit (123), and a second corner cutting knife (42), which is disposed on the second cutting unit (124), each of the first and second corner cutting knives (43, 42) comprising
• a first knife (100, 125) and
• a second knife (103, 126);
• at least one drive (107, 107') acting on the first and the second cutting unit (123, 124) for the displacement of the first and second knives (100, 103, 125, 126) by a uniform stroke in a Z-direction through the cutout (41) in the working plate (2) and through the workpiece (31, 140) resting thereon;
• a drive (81, 81') disposed on each cutting unit (123, 124) for the adjustment of the second knife (103, 126) in the Y-direction relative to the cutting unit (123, 124);
• and
• a control unit for the triggering of the drives (81, 81', 107, 107', 121).