Patent ID: 6748888
Filing Date: 2004-06-15
Classification: D05B

Abstract:
A directly motor-driven structure of a sewing machine, the sewing machine comprising:(A) an upper driving shaft mounted on upper side of a housing of the sewing machine for driving an upper stitching needle; (B) a lower driving shaft mounted on lower side of the housing for driving a lower stitching needle; and (C) a driving motor for driving the upper and lower driving shafts, making the upper and lower stitching needles perform sewing operation; the directly motor-driven structure of a sewing machine comprising: (a) a middle rotary shaft pivotally mounted in a middle section of the housing between the upper and lower driving shafts; (b) a first transmission mechanism connected between the lower driving shaft and the middle rotary shaft to drivingly rotatably connect the lower driving shaft with the middle rotary shaft, the first transmission mechanism being spaced from the lower stitching needle by a first length; and (c) a second transmission mechanism connected between the upper driving shaft and the middle rotary shaft to drivingly rotatably connect the upper driving shaft with the middle rotary shaft, the second transmission mechanism being spaced from the upper stitching needle by a second length, the second length being smaller than the first length, whereby the sewing machine is formed with a recessed installation space adjacent to the second transmission mechanism, the driving motor being installed in the recessed installation space and directly fixedly connected with the upper driving shaft.