Patent ID: 8905535

Claim:
A dot-matrix printer, comprising a main frame, a first movable frame, and a second movable frame, wherein the main frame supports a printer head; the first movable frame is used for supporting a platen and a first paper feeding roller, and is supported by the main frame and pivotally connected to one end of the main frame via a first pivot shaft so as to permit itself to be opened or closed relative to the main frame, the first movable frame being configured to rotate around the first pivot shaft to be opened towards the one end of the main frame; the second movable frame is used for supporting a second paper feeding roller, and is supported by the main frame and pivotally connected to the other end of the main frame via a second pivot shaft so as to permit itself to be opened or closed relative to the main frame; and wherein when the first movable frame and the second movable frame are closed relative to the main frame, the printer head is opposite to the platen to form a printing position, the second movable frame being configured to rotate around the second pivot shaft to be opened towards the other end of the main frame; the first paper feeding roller is tangent to the second paper feeding roller; and a paper feeding mechanism is formed by the tangential cooperation of the first paper feeding roller and the second paper feeding roller and is provided downstream of the printing position.