Adjustable paper blocking structure of thermal printers

1. An adjustable paper blocking structure of a thermal printer, comprising:

a base evenly provided with a plurality of tooth grooves;

a paper blocking component comprising a first paper blocking plate and a second paper blocking plate, wherein the first paper blocking plate and the second paper blocking plate are mirror-symmetrically arranged on the base and slidably connected to the base;

a locking component having one end rotatably connected to the first paper blocking plate and the other end engaged in the corresponding tooth groove;

wherein the base is provided with a first slot and a second slot, and a bottom end of the first paper blocking plate and a bottom end of the second paper blocking plate are respectively provided with a first rack and a second rack, the first rack and the second rack pass through the first slot and the second slot respectively and are engaged by a ratchet, the ratchet is rotatably attached to the base;

wherein the locking component comprises a rotating handle, a pin, and a reset spring, a bottom end of the pin passes through the bottom end of the first paper blocking plate and is slidably connected to the tooth groove, a top end of the pin passes through a top end of the first paper blocking plate and is rotatably connected to the rotating handle, a middle of the pin is fitted with the reset spring, and a top end of the reset spring is connected to a bottom surface of the first paper blocking plate and a bottom end of the reset spring is connected to a side wall of the pin.

2. The adjustable paper blocking structure of a thermal printer of claim 1 , wherein a first convex platform and a second convex platform are provided in a middle of an inner wall of the first paper blocking plate and in a middle of an inner wall of the second paper blocking plate, respectively.

3. The adjustable paper blocking structure of a thermal printer of claim 2 , wherein a lower side of the inner wall of the first paper blocking plate and a lower side of the inner wall of the second paper blocking plate are provided with a receiving groove, respectively, and the rotating handle is rotatably connected in the corresponding receiving groove.

4. The adjustable paper blocking structure of a thermal printer of claim 3 , wherein two blocking bars are provided in the receiving groove, and the rotating handle is connected between the two blocking bars.

5. The adjustable paper blocking structure of a thermal printer of claim 1 , wherein a middle of a top end of the rotating handle is provided with an arc-shaped surface and an outer edge of the top end of the rotating handle is provided with a rounded corner.

6. The adjustable paper blocking structure of a thermal printer of claim 1 , wherein two opposite side walls of the tooth groove are provided with a vertical surface and an inclined surface respectively, an angle between the vertical surface and a bottom surface of the tooth groove is 90°, and an angle between the inclined surface and the bottom surface of the tooth groove is 15°-75°, and a geometric dimension of the bottom end of the pin is adapted to a geometric dimension of the tooth groove.

7. The adjustable paper blocking structure of a thermal printer of claim 6 , wherein a tension spring is connected between the first rack and a side of the base close to the vertical surface.

8. The adjustable paper blocking structure of a thermal printer of claim 1 , wherein a block is provided in a middle of the base.

9. The adjustable paper blocking structure of a thermal printer of claim 8 , wherein the base is provided with a scale at a place where the first paper blocking plate and the second paper blocking plate are in contact with each other, and an origin of the scale is arranged at a middle position of the block, and a distance between the first paper blocking plate and the second paper blocking plate is 20-84 mm.

10. The adjustable paper blocking structure of a thermal printer of claim 1 , wherein an outer side wall of the second paper blocking plate is inwardly concave and surrounded by a coil, and the outer side wall of the second paper blocking plate is connected to a coil cover plate, the coil is located between the coil cover plate and the second paper blocking plate, a side of the coil in contact with the second paper blocking plate is provided with an identification module, and a side of the coil extending from the second paper blocking plate is provided with a signal transmission module.