Printing device

The invention relates to a printing device, which can release clamped paper in a printing process. A transmission structure of the printing device comprises a swinging arm, a movable baffle plate, a first gear and a gear set, wherein the movable baffle plate is arranged on the position corresponding to the swinging arm; the first gear is driven to rotate by a motor; and the gear set consists of asecond gear and a third gear which are mutually meshed, and the second gear is arranged on the swinging arm and driven by the first gear. Wherein the movable baffle plate influenced by different outside forces can relatively change the position of the swinging arm so as to change the meshing state of the second gear and the third gear in the gear set, to make the gear connection of the whole transmission system broken and to take out the clamped paper.