| 摘要 |
Disclosed is a sewing arm mechanism of an embroidery machine. Within the sewing arm mechanism, there are provided a needle bar vertical drive unit and a cloth pressing member vertical drive unit for vertically moving a needle bar and a cloth pressing member, respectively, by using the rotational driving force of an upper shaft. The sewing arm mechanism is configured in such a manner that the needle bar drive reaction force exerted on the upper shaft by the driving of the needle bar vertical drive unit, and the cloth pressing member drive reaction force exerted on the upper shaft by the driving of the cloth pressing member vertical drive unit act in opposite directions of each other, whereby the magnitudes of the reaction forces exerted on the upper shaft can be cancelled with each other. According to the present invention, two types of reaction forces produced when the needle bar vertical drive unit and the cloth pressing member vertical drive unit by the rotating drive force of the upper shaft within the sewing arm of the embroidery machine acting on the upper shaft act opposite to each other. As a result, the reaction forces exerted on the upper shaft are cancelled with each other, so that the noise and vibration occurring within the sewing arm of the embroidery machine when the needle bar vertical drive unit and the cloth pressing member vertical drive unit are driven. Furthermore, because it is possible to drive the needle bar vertical drive unit and the cloth pressing member vertical drive unit in high speed within the sewing arm of the embroidery machine, the work speed of the embroidery machine can be increased, thereby dramatically improving work productivity.
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