As shown in the figure, the power transmitted from the main motor drives M3 and M through deceleration of the belt pulley 2. The rack M1 (equipped with a pair of ring-hole rollers) is driven by the crank linkage mechanism to make periodic reciprocating motion. In one cycle, when the machine head reaches the limit position (position A in the figure), the pass is gradually expanded, and a certain amount of tube blank is fed forward through the intermittent action of the rotary feed mechanism, and it is rotated by an angle. 

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