Method and device for correcting deviation of paper medium, and financial self-service device

A paper medium skew correcting device, comprising:

• a support comprising a pair of fixed stop plates arranged in parallel;
• a skew correcting tapered roller assembly comprising a tapered roller, a reference plate located at a large end face of the tapered roller and a tapered roller transmission shaft, wherein the skew correcting tapered roller assembly is connected to transmission shaft mounting holes of the pair of fixed stop plates on a left side and a right side by the tapered roller transmission shaft;
• a tapered cover plate covering on the tapered roller, wherein a paper medium skew correcting passage is formed between an inner wall of the tapered cover plate and an outer wall of the tapered roller, an auxiliary pressure roller mechanism is mounted on an outer wall of the tapered cover plate and is configured to press a paper medium in the skew correcting passage against the outer wall of the tapered roller tightly, and the tapered cover plate is provided with an opening for the auxiliary pressure roller mechanism to elastically press the tapered roller tightly;
• and
• a driving transmission assembly for providing power to the tapered roller,
• an entrance leading passage, wherein the entrance leading passage comprises a horizontal passage interface and an inclined turning passage, an inner wall of the inclined turning passage is a smooth curved surface and is tangentially connected to an inner wall of the horizontal passage and the inner wall of the tapered cover plate,
• wherein the entrance leading passage further comprises a driving banknote picking roller, a guide driven pinch roller and a turning driven roller in the listed sequence in a conveying direction of the paper medium, the driving banknote picking roller is connected to the pair of fixed stop plates on the two sides by a fixed shaft, the driving banknote picking roller is in contact with the guide driven pinch roller through a roller slot in the horizontal passage interface, and the turning driven pinch roller is connected to the pair of fixed stop plates on the two sides by an inclined shaft, and the turning driven pinch roller is in contact with the tapered roller through a roller slot in the inclined turning passage.