Paper-cutting moving knife device for miniature printer

The utility model discloses a paper-cutting moving knife device for a miniature printer, and relates to a printer. The device is provided with a shell cover, a motor, a worm gear pair, a moving knife blade, a moving knife blade fixing plate, a power unit, and an installation plate. The motor, the worm gear pair, the moving knife blade, the moving knife blade fixing plate and the power unit are disposed in the shell cover, and the installation plate is disposed at the bottom of the shell cover. An output shaft of the motor is connected with a worm, and an axis hole of the worm sleeves a convex column of an upper cover plate. The moving knife blade is buckled on the moving knife blade fixing plate. A lower cover plate is disposed on the installation plate. The power unit is provided with a sliding block, a moving knife limiting plate and a spring. The moving knife limiting plate is provided with an embedded groove, and the moving knife limiting plate is pressed on the moving knife blade fixing plate. Two ends of the moving knife limiting plate are respectively in fixed connection with the lower cover plate. The sliding block is disposed in the embedded groove of the moving knife blade fixing plate and is in sliding fit with the embedded groove. The sliding block is in contact connection with an eccentric column disposed on a worm gear. Two ends of the spring are respectively embedded on the sliding block and the moving knife blade fixing plate in a hooked manner. The device can prevent the moving knife from bouncing during movement, guarantees that paper-cutting positions are located in the same horizontal line, and achieve full cutting and semi-cutting through the same cutter.