Programmable semi-automatic machine for topstitching operations on collars, cuffs, flaps, etc., bottom and top feed, integrated energy-saving servo motor QUICK ROTAN, 4.500 s.p.m., needle positioning, thread trimmer, automatic presser foot lift and bar tacking. The sensor system for the material edge recognizing and the stitch length correction, electronic, programmable edge guide, stitches number programming.