Abstract: A sewing machine includes a sewing head having a sewing needle to be vertically reciprocally driven, and a shuttle base having a shuttle to be rotatably driven in synchronism with the vertical movement of the sewing needle for forming stitches. A machine frame includes a pair of support posts spaced laterally from each other, an upper frame having greater rigidness for mounting the sewing head thereon, and a lower frame having greater rigidness and disposed below the upper frame for mounting the shuttle base thereon. Each of the upper frame and the lower frame extends between the pair of support posts and is fixed thereto.

Abstract: Disclosed is a multi-head sewing machine having an improved structure for driving a main shaft and a lower shaft for driving needle bars and thread take-up levers so as to prevent distortion of these shafts, in turn, variation of stitch performance in the respective heads from occurring.

Abstract: In an embroidery machine according to the present invention, at least one of driving mechanisms required for embroidery sewing has a driving source independent of the other driving mechanisms, and a control device is provided to control the driving source and those of the other driving mechanisms to be synchronously driven. With this construction, as for the driving mechanism having the independent driving source, since an interlocking mechanism can be omitted, the construction can be simplified, so that vibrations or noises can be reduced. Further with a control signal from the control device, a timing of operation of the driving mechanism having the independent drive source can be freely determined according to the embroidery mode.