A paper feeding mechanism includes a vacuum absorption variable-speed paper feeding mechanism and a vacuum absorption constant-speed paper feeding mechanism, two edge pressing wheels are installed on a edge pressing paper feeding shaft arranged above a constant-speed paper feeding wheel in the middle, the gaps between the edge pressing wheels and the constant-speed paper feeding wheel in the middle are smaller than the thickness of a paper board, and the distance between the two edge pressing wheels is adjusted by moving on the edge pressing paper feeding wheel shaft.
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