Method of sewing supplementary parts on a workpiece

A method of sewing at least one supplementary part (43, 44;

• 57 to 61) on a workpiece (30;
• 56) by a seam (51, 55;
• 63) by use of a sewing machine (1) that is drivable by an electric driving motor (15), which is provided with a computer-equipped control unit (17) and has an external operating switch (18) to be actuated by an operator for triggering a sewing operation, comprising the following steps:
• a) input of a workpiece identification (46;
• 71) that is applied to the workpiece (30;
• 56) into the computer (21) and activation of a sewing program out of a plurality of sewing programs stored in the computer (21), with each sewing program including data for allocation of a given supplementary part (43, 44;
• 57 to 61);
• b) insertion of the workpiece (30;
• 56) into the sewing machine (1);
• c) seizure of the supplementary part (43, 44;
• 57 to 61) by the operator and placement thereof on the workpiece (30;
• 56);
• d) input of an identification (48, 54;
• 72 to 76) that is applied to the supplementary part (43, 44;
• 57 to 61) into the computer (21);
• e) release of the operating switch (18) in case of conformity, with the data included in the activated sewing program, of the workpiece identification (46;
• 71) and of the identification of the supplementary part (43, 44;
• 57 to 61) that is to be sewn on by the seam (51, 55;
• 63);
• and
• f) production of the seam (51, 55;
• 63) by the supplementary part (43, 44;
• 57 to 61) being sewn on the workpiece (30;
• 56).