Method and apparatus for regulation of seam shape

A device for regulating the shape of a seam on goods produced by a sewing machine, comprising

• at least one detection head on the sewing machine in the vicinity of a formation point of a seam,
• at least one light emitter arranged adjacent to the formation point of the seam,
• driving means on the sewing machine for transferring the goods while sewing,
• an information processing system concerning to said detection head and driving means so that when sewing information is stored in the information processing system at an information recording state, edge position of the goods detected by the detection head and movement of the goods detected by the driving means are memorized, and when an automatic sewing is performed, edge position of the goods actually sensed by the detection head is compared with the memorized value in the information processing system and goods being sewn are positioned and moved in accordance with the data detected at the information recording stage and stored in the information processing system,
• said information processing system comprising a first measured data receiver for manual guidance for receiving information from the driving means and the detection head at the information recording stage, a memory connected to the first measured data receiver for recording data at the information recording state, a second measured data receiver for automatic sewing for receiving information from the driving means and the detection head for the automatic sewing, a comparator for comparing the data in the memory and the data from the second measured data receiver, and a seam shape regulator connected to the comparator so that when there is a deviation between the data in the memory and the data from the second measured data receiver, the driving means is controlled to minimize the deviation.