Combined transmission shaft and rotating device having combined transmission shaft

A rotating device having a combined transmission shaft, comprising:

• a rotating disc comprising a turret and a plurality of driven rollers disposed around the turret;
• and
• a combined transmission shaft located at a side of the rotating disc further comprising:
• a first roller gear cam further comprising a first shaft, a combined shaft and a first helical tooth, the first shaft having a first outer annular surface with two sides opposite to each other, a first side surface and a second side surface, the first side surface and the second side surface being connected to the two sides of the first outer annular surface respectively, the combined shaft protruding outward from the first side surface of the first shaft, the first helical tooth being located at the first outer annular surface and having a first outer surface and a first inner surface, and the first outer surface being opposite to the first inner surface;
• and
• a second roller gear cam further comprising a second shaft and a second helical tooth, the second shaft having a second outer annular surface with two sides opposite to each other, a third side surface, a fourth side surface and a combination hole, the third side surface and the fourth side surface being connected to the two sides of the second outer annular surface respectively, the combination hole extending through the second roller gear cam from the third side surface to the fourth side surface, the second helical tooth being located at the second outer annular surface and having a second outer surface and a second inner surface, the second inner surface being opposite to the second outer surface and facing to the first inner surface, the combined shaft of the first roller gear cam passing through the combination hole of the second roller gear cam, and the first roller gear cam being for moving relative to the second roller gear cam, such that the first outer surface of the first helical tooth and the second outer surface of the second helical tooth are pressed against parts of the plurality of driven rollers respectively, or the first inner surface of the first helical tooth and the second inner surface of the second helical tooth are pressed against parts of the plurality of driven rollers respectively.