Thermal printer with pulsator adjusting clamping width

Abstract

The utility model provides a thermal printer with a pulsator adjusting clamping width, which comprises a base, a cover body, a rubber roller, a thermosensitive sheet and a paper clamping assembly, the paper clamping assembly comprises a mounting bracket, two clamping plates, two sliding blocks, a central gear, an elastic piece, a limiting block, a pulsator and a worm, the mounting bracket is provided with two sliding grooves and a limiting groove along the paper width direction, and the two sliding grooves are communicated with the central gear. The two sliding blocks move in opposite directions, the elastic piece is connected between the sliding blocks and the mounting support, the worm is arranged on the mounting support in the paper width direction, the impeller is connected with the worm, the limiting block is in threaded fit with the worm, the limiting block is provided with a limiting part in the limiting groove, and the limiting part moves in the limiting groove in the paper width direction along with coaxial rotation of the worm driven by the impeller. The limiting part is matched with the sliding block in a limiting mode, the printing paper roll can be clamped and fixed at the clamping position through the two clamping plates which are elastically connected, and due to the fact that the center gear is meshed with the gear, center clamping and center resetting are achieved.

Description

Technical Field

[0001] The utility model relates to the field of thermal printers, in particular to a thermal printer with a clamping width adjustable by a wave wheel. Background Art

[0002] With the popular application of thermal printers, thermal printers are used not only in automatic teller machines in banks, cash registers in supermarkets, e-commerce shipping places, and catering shops, etc. In particular, the printing in the e-commerce industry and the express delivery industry is growing rapidly, and higher requirements are put forward for the use stability and operation convenience of printers.

[0003] In order to improve the rotational operation stability of the printing roll paper, generally a paper clamping component is arranged in the paper bin of the printer, and the printing roll paper is clamped and supported by a clamping plate. The existing clamping plates generally drive the clamping plates to be centered and clamped through the arrangement of elastic members. When the printing paper roll is removed, the clamping plates on both sides are adjacent to each other due to the central elastic force. Therefore, it is difficult for users to separate and move the adjacent clamping plates, which affects the convenience of replacing the printing paper roll. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a thermal printer with a clamping width adjustable by a wave wheel.

[0005] To achieve the purpose of the utility model, the utility model provides a thermal printer with a clamping width adjustable by a wave wheel, which includes a base, a cover body, a rubber roller, a thermal film and a paper clamping component. The base is provided with a paper bin, the paper clamping component is arranged in the paper bin, the cover body is hinged to the base and covers the paper bin, an outlet is formed between the cover body and the base, one of the rubber roller and the thermal film is arranged on the base, the other of the rubber roller and the thermal film is arranged on the cover body, the thermal film and the rubber roller are opposite to each other and form a paper feeding channel, and the paper feeding channel communicates between the outlet and the paper bin; the paper clamping component includes a mounting bracket, two clamping plates, two sliders, a central gear, an elastic member, a limiting block, a wave wheel and a worm. The mounting bracket is provided with two sliding grooves and a limiting groove along the paper width direction, the limiting groove communicates with one of the sliding grooves, the central gear is rotatably arranged on the mounting bracket, the slider is provided with a rack extending along the paper width direction, the two racks are respectively located on the radial two sides of the central gear and meshed with the central gear, the slider is slidably arranged in the sliding groove, the two sliders move in opposite directions, the elastic member is connected between the slider and the mounting bracket, one clamping plate is connected with one slider, and a clamping position is formed between the two clamping plates; the worm is arranged on the mounting bracket along the paper width direction, the wave wheel is connected with the worm, the limiting block is in threaded cooperation with the worm, the limiting block is provided with a limiting portion in the limiting groove, and as the wave wheel drives the worm to rotate coaxially, the limiting portion moves along the paper width direction in the limiting groove, and the limiting portion is in limiting cooperation with the slider.

[0006] A further solution is that the mounting bracket is provided with support blocks at both ends of the worm respectively, the support blocks are provided with support grooves, and the worm is rotatably mounted between the two support grooves.

[0007] A further solution is that the impeller is sleeved on the outer circumference of the worm, and the diameter of the impeller is larger than the diameter of the worm.

[0008] A further solution is that the impeller is close to the support block on one side.

[0009] A further solution is that the support block and the worm are located above the slide slot, the limit block is provided with a threaded hole extending along the paper width direction at the upper end, the worm is threadedly matched with the threaded hole, and the limit portion is located at the lower end of the limit block.

[0010] A further solution is that the limit groove is located on the back side of the slide groove relative to the clamping position, and the mounting bracket is provided with a limit strip extending along the paper width direction on the back side of the clamping position, a limit groove is formed between the limit strip and the mounting bracket, the limit groove is provided with an opening at the upper end, the limit part is inserted into the limit groove from the opening, and the limit part cooperates with the limit strip and the mounting bracket.

[0011] A further solution is that the base is provided with a bottom plate at the bottom of the paper bin, and two sliding windows and an adjustment window are arranged through the bottom plate, the two sliding windows extend along the paper width direction, and the mounting bracket is arranged on the back side of the bottom plate equivalent to the clamping position, a sliding window is opposite to and connected to a slide groove, and the impeller is located at the adjustment window.

[0012] A further solution is that the adjustment window is located in the middle of the upper end of the base plate.

[0013] The beneficial effect of the utility model is that the printing paper roll can be clamped and fixed in the clamping position by the two elastically connected clamping plates, and the center clamping and center resetting can be realized by utilizing the meshing of the center gear and the gear. In addition, the present invention can drive the limit block to move along the paper width direction by rotating the impeller. Therefore, the limit part cooperates with the slider to limit the resetting position of the slider, and the adjustable limit part is utilized to realize the adjustability of the resetting position. Then, when resetting, the two clamping plates can also be separated at a certain preset distance, which is more convenient for the user to pull the clamping plates apart, and is also convenient for replacing and installing the printing paper roll. In addition, through the shielding of the bottom plate and the use of the adjustment window, the impeller is arranged in the center and close to the support block, which not only makes the printing paper feeding smoother, but also makes the adjustment of the impeller more convenient and stable. Furthermore, by utilizing the arrangement of the limit strip, the limit block can move stably along the paper width direction when the worm rotates, and the limit part can better limit the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an embodiment of a thermal printer of the utility model.

[0015] Figure 2 This is the structural diagram of an embodiment of the thermal printer of the present utility model when the cover is opened.

[0016] Figure 3 This is the structural diagram of the base in an embodiment of the thermal printer of the present utility model.

[0017] Figure 4 This is the structural diagram of the paper clamping assembly in an embodiment of the thermal printer of the present utility model.

[0018] Figure 5 This is the structural diagram of the paper clamping assembly in another perspective in an embodiment of the thermal printer of the present utility model.

[0019] Figure 6 This is the schematic diagram of the paper clamping assembly in the paper clamping state in an embodiment of the thermal printer of the present utility model.

[0020] Figure 7 This is the schematic diagram of the paper clamping assembly in the reset state in an embodiment of the thermal printer of the present utility model.

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0022] Refer to Figures 1 to 7 , the thermal printer includes a base 11, a cover 12, a rubber roller 111, a thermal film 124, and a paper clamping assembly 2. The base 11 is provided with a paper bin 112. The cover 12 is hinged to the base 11 and covers the paper bin 112. An outlet 13 is formed between the cover 12 and the base 11. The rubber roller 111 is rotatably arranged on the base 11. The thermal film 124 is arranged on the cover 12. The thermal film 124 and the rubber roller 111 face each other and form a paper feeding channel. The paper feeding channel communicates between the outlet 13 and the paper bin 112.

[0023] The paper clamping assembly 2 includes a mounting bracket 25, two clamping plates 21, two sliders 22, a central gear 23, an elastic member 24, a limiting block 263, a cam 261, and a worm 262. The mounting bracket 25 is provided with two chutes 251 and a limiting groove 252 along the paper width direction Y. The two chutes 251 are distributed vertically. The limiting groove 252 communicates with one of the upper chutes 251. The limiting groove 252 is located on the back side of the chute 251 relative to the clamping position 20. The mounting bracket 25 is provided with a limiting strip 253 extending along the paper width direction Y on the back side of the clamping position 20. A limiting groove 252 is formed between the limiting strip 253 and the mounting bracket 25. The limiting groove 252 has an opening at the upper end.

[0024] The central gear 23 is rotatably arranged on the mounting bracket 25. The slider 22 is provided with racks 221 extending along the paper width direction Y. The two racks 221 are respectively located on the radial two sides of the central gear 23 and mesh with the central gear 23. The slider 22 is slidably arranged in the chute 251. The two sliders 22 move in opposite directions. The elastic member 24 is connected between the slider 22 and the mounting bracket 25. The elastic member 24 can be a spring, a tension spring or a torsion spring, etc. to reset the slider. One end of the elastic member 24 is connected to the connecting block 222 of the lower slider 22, and the other end of the elastic member 24 is connected to the fixed block 223 of the mounting bracket 25. A clamping plate 21 is connected to one slider 22. A clamping position 20 is formed between the two clamping plates 21. The clamping position 20 is located in the paper bin 112 and is used for clamping the printing paper roll.

[0025] The worm 262 is arranged on the mounting bracket 25 along the paper width direction Y. The mounting bracket 25 is respectively provided with support blocks 254 at both ends of the worm 262. The support blocks 254 are provided with support grooves 255. The support grooves 255 have bayonets and are arranged in a C-shaped groove. The worm 262 is rotatably mounted between the two support grooves 255. The pulley 261 is sleeved on the outer periphery of the worm 262. The pulley 261 is close to one of the support blocks 254. The diameter of the pulley 261 is larger than that of the worm 262. By using the drive connection between the pulley 261 and the worm 262, rotating the pulley 261 can drive the worm 262 to rotate coaxially.

[0026] The support block 254 and the worm 262 are located above the chute 251. The limiting block 263 is provided with a threaded hole 264 extending along the paper width direction Y at the upper end, and a limiting portion 265 is extended and arranged at the lower end of the limiting block 263. The worm 262 is in threaded cooperation with the threaded hole 264 of the limiting block 263. The limiting portion 265 is inserted into the limiting groove 252 from the opening. By using the limiting cooperation between the limiting portion 265, the limiting strip 253 and the mounting bracket 25, then through the rotation of the worm 262, the limiting portion 265 moves along the paper width direction Y in the limiting groove 252. By adjusting the position of the limiting portion 265, the limiting portion 265 is in limiting cooperation with the slider 22 and limits the reset position of the upper slider 22.

[0027] The base 11 is provided with a bottom plate 113 at the bottom of the paper bin 112. The upper surface of the bottom plate 113 encloses a part of the paper bin 112, and the bottom plate 113 is arranged obliquely from bottom to top. The bottom plate 113 is provided with two sliding windows 115 and an adjustment window 114 in a penetrating manner. The two sliding windows 115 extend along the paper width direction Y and are distributed vertically. The adjustment window 114 is located in the middle of the upper end of the bottom plate 113 and above the upper sliding window 115. The mounting bracket 25 is arranged on the back side of the bottom plate 113 corresponding to the clamping position 20. One sliding window 115 is opposite to and communicated with one chute 251. The pulley 261 is located at the adjustment window 114.

[0028] Reference Figure 6 When the printing paper roll 10 is clamped between the two clamping plates 21, the two clamping plates 21 are clamped in the middle by the cooperation of the elastic member 24 and the central gear 23. Figure 7 When the printing paper roll 10 is replaced, that is, the printing paper roll 10 is removed, the two clamps 21 are reset to the center under the action of the elastic member 24, and since the limiter 265 limits the slider 22, the limiter 265 is adjacent to the slider 22, and then the two clamps 21 can be reset separately at a preset distance, and the user can easily move the clamps 21 when installing the printing paper roll again. Of course, when the distance between the two clamps is slightly larger than the paper width of the printing paper roll, the two clamps can also support the printing paper roll at a preset distance, which can also achieve the purpose of this case.

[0029] Of course, the above-mentioned paper clamping assembly 2 can also be used in another model or type of thermal printer, such as a thermal sheet arranged on a base, and a rubber roller rotatably arranged on a cover. This type of printer can also achieve the purpose of the invention by using the paper clamping assembly of this case.

[0030] As can be seen from the above, the printing paper roll can be clamped and fixed in the clamping position by the two elastically connected clamping plates. The center gear and the gear are engaged to achieve center clamping and center resetting. In addition, the present invention can drive the limit block to move along the paper width direction by rotating the impeller. Therefore, the limit part and the slider are used to limit the reset position of the slider, and the adjustable limit part is used to achieve the adjustability of the reset position. Then, when resetting, the two clamping plates can be separated at a certain preset distance, which is more convenient for the user to pull the clamping plates apart, and it is also convenient for the replacement and installation of the printing paper roll.

Claims

1. A thermal printer with a wave wheel for adjusting the clamping width, comprising a base, a cover, a rubber roller, a thermal film, and a paper clamping assembly. The base is provided with a paper bin, the paper clamping assembly is arranged in the paper bin, the cover is hinged to the base and covers the paper bin, an outlet is formed between the cover and the base, one of the rubber roller and the thermal film is arranged on the base, the other of the rubber roller and the thermal film is arranged on the cover, the thermal film and the rubber roller face each other and form a paper feeding channel, and the paper feeding channel communicates between the outlet and the paper bin; It is characterized in that: The paper clamping assembly includes a mounting bracket, two clamping plates, two sliders, a central gear, an elastic member, a limiting block, a wave wheel, and a worm. The mounting bracket is provided with two sliding grooves and a limiting groove along the paper width direction, the limiting groove communicates with one of the sliding grooves, the central gear is rotatably arranged on the mounting bracket, the slider is provided with a rack extending along the paper width direction, the two racks are respectively located on the radial two sides of the central gear and mesh with the central gear, the slider is slidably arranged in the sliding groove, the two sliders move in opposite directions, the elastic member is connected between the slider and the mounting bracket, one clamping plate is connected to one slider, and a clamping position is formed between the two clamping plates; The worm is arranged on the mounting bracket along the paper width direction, the wave wheel is connected to the worm, the limiting block is in threaded cooperation with the worm, the limiting block is provided with a limiting portion in the limiting groove, and as the wave wheel drives the worm to rotate coaxially, the limiting portion moves along the paper width direction in the limiting groove, and the limiting portion is in limiting cooperation with the slider.

2. The thermal printer according to claim 1, characterized in that: The mounting bracket is respectively provided with support blocks at both ends of the worm, the support blocks are provided with support grooves, and the worm is rotatably supported between the two support grooves.

3. The thermal printer according to claim 2, characterized in that: The wave wheel is sleeved on the outer periphery of the worm, and the diameter of the wave wheel is larger than that of the worm.

4. The thermal printer according to claim 3, characterized in that: The wave wheel is close to one of the support blocks.

5. The thermal printer according to claim 2, characterized in that: The support blocks and the worm are located above the sliding groove, the limiting block is provided with a threaded hole extending along the paper width direction at the upper end, the worm is in threaded cooperation with the threaded hole, and the limiting portion is located at the lower end of the limiting block.

6. The thermal printer according to claim 2, characterized in that: The limiting groove is located on the back side of the sliding groove relative to the clamping position, the mounting bracket is provided with a limiting strip extending along the paper width direction on the back side of the clamping position, the limiting strip and the mounting bracket form the limiting groove, the limiting groove is provided with an opening at the upper end, the limiting portion is inserted into the limiting groove from the opening, and the limiting portion is in limiting cooperation with the limiting strip and the mounting bracket.

7. The thermal printer according to any one of claims 1 to 6, characterized in that: The base is provided with a bottom plate at the bottom of the paper bin, and two sliding windows and an adjustment window are penetrated through the bottom plate. The two sliding windows extend along the paper width direction. The mounting bracket is arranged on the back side of the bottom plate corresponding to the clamping position. One of the sliding windows is opposite to and communicated with one of the sliding grooves. The pulley is located at the adjustment window.

8. The thermal printer according to claim 7, characterized in that: The adjustment window is located in the middle of the upper end of the bottom plate.

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