Patent ID: 6564732
Filing Date: 2003-05-20
Classification: D05B

Abstract:
Actuating device intended for a sewing means or sewing machine, comprising:a presser means for holding down sewn material during stitching and material transport, an actuating element for the presser means including at least one linear motor with a drive rod for controlling the presser force which is applied by the presser means to the sewn material, which rod is connected to the presser means, at least one elastic, low-mass coupling element connecting the drive rod to the presser means, wherein the presser means can be moved by the linear motor between a raised position and a lowered position, and means for controlling the linear motor as the rpm (n) of the sewing means or sewing machine increases to apply an additional compressive force to the sewn material by controlling current flow to the linear motor by applying a direct current component IG which changes depending on time or depending on the angular position of the main shaft of the sewing means or the sewing machine.