Flattening device and financial self-service equipment

A flattening device, configured to flatten a sheet medium being input, comprising:

• a holder configured to support the following components;
• at least one flattening roller set, comprising a first flattening roller and a second flattening roller arranged oppositely at two sides of a sheet medium conveying path;
• and a power mechanism configured to drive the first flattening roller and the second flattening roller to rotate;
• wherein a surface of the first flattening roller is distributed with n arc-shaped grooves arranged in parallel with an axis direction of the first flattening roller, wherein n is a natural number greater than or equal to 1, and a surface of the second flattening roller is provided with at least one arc-shaped protruding portion in rolling engagement with the arc-shaped grooves of the first flattening roller;
• and wherein, the first flattening roller and the second flattening roller are in rolling engagement to form a conveying passage for the sheet medium;
• and
• wherein, at least one side of two sides of the flattening roller set is provided with a conveying guide roller;
• and a preset differential value is provided between a surface linear velocity of the conveying guide roller and a surface linear velocity of the first flattening roller.