The main motor A of the computerized multi-head embroidery machine drives the lower shaft I through a poly-ribbed belt. The lower shaft and the upper shaft IV are driven by a chain with a transmission ratio of 1. The speed of the main motor can be adjusted to achieve the upper shaft in the range of 300-650 stitches/min. Internal rotation, 80 stitches/min when inching. The end of the lower shaft drives the rotary encoder E through gear pairs 3 and 4 with a transmission ratio of 1, so that it generates a series of pulse signals corresponding to the rotation angle of the lower shaft. The host control program uses this pulse signal to coordinate the movement of the entire embroidery machine.

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