Buttonhole machine i.e. sewing machine, for producing e.g. eyelet buttonhole in sewing goods, has control device to correct signal to reduce position deviation, when deviation exceeds limit, before cutting unit reaches cutting end position

摘要

The machine (1) has an encoder, which outputs a detection pulse, which corresponds to an actual moved position of a sewing piece cutting unit (30)/cutter sensor (50). A control device calculates position deviation between a movement position of a sewing piece cutting unit dependent on a command signal and the actual moved position. The control device functions as a correction unit for correcting the command signal to reduce the position deviation, when the position deviation exceeds a permissible limit, before the cutting unit or the cutter sensor reaches a cutting end position.