PROBLEM TO BE SOLVED: To provide a sewing machine in which the frequency of vertical motion of a presser foot is made more appropriate.
SOLUTION: The sewing machine comprises a vertical needle motion means 2 for moving up and down a sewing needle 108, positioning means 76a, 77a which mutually position a workpiece and the sewing needle, a presser foot means 1 which vertically moves a presser foot 29 so that the workpiece held at a cloth hold section 111 does not go up with the sewing needle, a presser foot height adjusting means 34 which adjusts the height of the presser foot. The presser foot height adjusting means has a driving source 42 for adjusting the height of the presser foot and a motion control means 1000 which drives the driving source at each time the presser foot goes up and goes down and adjusts amplitude of vertical motion of the presser foot.
COPYRIGHT: (C)2006,JPO&NCIPI
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