Self-cooling type thick film thermal printing head

Abstract

The utility model discloses a self-cooling type thick film thermal printing head which comprises a printing head body, a protective cover is sleeved on the outer side of the printing head body, a collecting box is fixed inside the protective cover, a heat conducting rod penetrates through the bottom of the collecting box, and the bottom of the heat conducting rod is in contact with the upper end face of the printing head body in an attached mode. The conveying pipe fixedly penetrates through the top of the collecting box, a fixing cavity is formed in the printing head body, a memory metal sheet is arranged in the fixing cavity, and supporting plates are fixed to the two ends of the memory metal sheet; and the cooling mechanism is arranged in the protective cover, and the cooling mechanism automatically dissipates heat of the printing head body. According to the self-cooling type thick film thermal printing head, when the temperature is too high and exceeds the limit in the using process, the memory metal sheet is driven to deform, the cooling mechanism is driven to automatically cool the thermal printing head, and the phenomenon that the printing head is damaged due to the too high temperature, and printing is affected is avoided.

Description

Technical Field

[0001] This utility model relates to the field of thermal printhead technology, specifically a self-cooling thick film thermal printhead. Background Technology

[0002] A thermal printhead is a core component of a machine that outputs images thermally. It primarily heats thermal paper, causing it to change color and form a printed image. Common applications include decorative stickers, convenience store receipts, and barcode labels for logistics and food. Thermal printheads are also used in thick-film production processes. For example, a thick-film thermal printhead with notification number CN215551957U includes a mounting base and a thermal printhead mounted within the mounting base. A data cable harness is located at the lower end of the thermal printhead, which is mounted in a mounting cavity on the upper surface of the mounting base. The thermal printhead is equipped with locking mechanisms at both ends, and a clamping spring at the bottom of the mounting cavity to elastically press the printhead against the paper. Both sides of the mounting base have fixing mechanisms that secure it to the printer. When installing the thermal printhead, it is clamped into the mounting cavity and secured by the locking mechanisms, facilitating easy removal. The clamping springs also elastically press the printhead firmly onto the paper, ensuring clearer printing and reducing the likelihood of blurry images. However, this thick-film thermal printhead still has the following drawbacks in actual use:

[0003] Thermal printheads generate a lot of heat during use. When the heat exceeds the limit, it can easily damage the thermal printhead and affect printing. Traditional thermal printheads lack a structure to dissipate heat and cool the printhead when the temperature is too high. To address the above issues, there is an urgent need for innovative designs based on the existing thermal printheads. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cooling thick-film thermal printhead to solve the problem mentioned in the background art that thermal printheads generate high heat during use, and when the heat exceeds the limit, it can easily damage the thermal printhead and affect printing. Traditional thermal printheads lack a structure to dissipate heat and cool the printhead when the temperature is too high.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a self-cooling thick film thermal printhead, comprising a printhead body, a protective cover fitted on the outside of the printhead body, and a collection box fixed inside the protective cover, a heat-conducting rod penetrating through the bottom of the collection box, the bottom of the heat-conducting rod being in contact with the upper end face of the printhead body, and a collection cavity being opened inside the collection box.

[0006] It also includes: a transmission tube, which is fixedly inserted through the top of the collection box; a fixed cavity is provided inside the print head body; a memory metal sheet is provided inside the fixed cavity; support plates are fixed at both ends of the memory metal sheet; and a fixed plate is provided on the inner wall of the fixed cavity.

[0007] A cooling mechanism is located inside the protective cover, which automatically dissipates heat from the printhead body.

[0008] Preferably, the heat-conducting rods are evenly distributed on the collection box, and the internal height of the collection cavity decreases sequentially from both ends to the middle, so that the heat generated by the printhead body can be transferred to the collection box through the heat-conducting rods.

[0009] Preferably, the collecting cavity is interconnected with the interior of the fixed cavity through the transmission pipe, and the two ends of the memory metal sheet form a sliding structure through the support plate and the interior of the fixed cavity. The top and bottom of the support plate are in contact with the lower end face of the fixed plate and the inner bottom surface of the fixed cavity, respectively. The heat entering the collecting cavity can be transferred to the fixed cavity through the transmission pipe.

[0010] Preferably, the cooling mechanism includes an airbag disposed on the top surface of the fixed cavity, and a one-way air inlet valve is provided on the protective cover above the airbag. When the shape memory metal sheet comes into contact with high temperature, it can deform and compress the airbag.

[0011] Preferably, both ends of the airbag are fixed with one-way air supply tubes, and the lower end of the airbag has a concave structure. The end of the one-way air supply tube away from the airbag is fixed to the protective cover. In this way, the shape memory metal sheet can fit perfectly with the lower end of the airbag after deformation, and squeeze the airbag to transmit the gas inside to the one-way air supply tube.

[0012] Preferably, the airbag is interconnected by a one-way air supply pipe and an air supply channel, and the air supply channel is connected to the air outlet through a connecting cavity. Gas is transmitted to the air supply channel and the connecting cavity through the one-way air supply pipe.

[0013] Preferably, the air supply channel and the connecting cavity are both located on the side of the printhead body, and the air outlets are equally spaced on the inner side of the printhead body. The air outlets are tapered, so that the gas can be discharged from the air outlets and blown onto the printhead body to cool it down.

[0014] Compared with the prior art, the beneficial effects of this utility model are: when the temperature of this self-cooling thick-film thermal printhead is too high during use and exceeds the limit, the cooling mechanism can automatically dissipate heat and cool the thermal printhead by deforming the shape memory metal sheet, thus avoiding printhead damage and printing problems caused by excessive temperature. The specific details are as follows:

[0015] 1. Heat is collected and transferred to the collection cavity through the heat-conducting rod, and then transferred to the fixed cavity through the transfer pipe. When the heat reaches the value of the shape memory metal sheet, the shape memory metal sheet is heated and deformed and bent. During the bending process, the support plate slides between the fixed cavity and the fixed plate to ensure the stability during the bending process.

[0016] 2. When the shape memory metal sheet is bent, it can fit into the recess of the airbag and compress the airbag. In this way, the gas inside the airbag can be transmitted to the air supply channel through the one-way air supply tube, and then to the connecting cavity. Finally, it can be discharged from the air outlet and blown onto the print head body to cool it down. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0019] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 4 This is a cross-sectional view of the collection box of this utility model;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the airbag of this utility model;

[0022] Figure 6 This is a schematic diagram of the shape memory metal sheet deformation structure of this utility model.

[0023] In the diagram: 1. Printhead body; 2. Protective cover; 3. Heat-conducting rod; 4. Collection box; 5. Collection chamber; 6. Transfer pipe; 7. Air outlet; 8. Fixing chamber; 9. Memory metal sheet; 10. Support plate; 11. Fixing plate; 12. Airbag; 13. One-way air inlet valve; 14. One-way air delivery pipe; 15. Air delivery channel; 16. Connecting chamber. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 This utility model provides a technical solution:

[0026] To address the problems existing in the prior art, this embodiment provides the following technical solution: a self-cooling thick-film thermal printhead, comprising a printhead body 1, a protective cover 2 fitted on the outer side of the printhead body 1, and a collection box 4 fixed inside the protective cover 2. A heat-conducting rod 3 penetrates through the bottom of the collection box 4, and the bottom of the heat-conducting rod 3 is in contact with the upper end face of the printhead body 1. A collection cavity 5 is provided inside the collection box 4. The printhead body 1 also includes: a transmission pipe 6 fixedly penetrating the top of the collection box 4; a fixed cavity 8 provided inside the printhead body 1; a memory metal sheet 9 disposed inside the fixed cavity 8; support plates 10 fixed at both ends of the memory metal sheet 9; and a fixed plate 11 disposed on the inner wall of the fixed cavity 8; and a cooling mechanism disposed inside the protective cover 2, which automatically dissipates heat from the printhead body 1.

[0027] Because thermal printheads generate high temperatures during use, excessive heat can damage them, affecting printing. Traditional thermal printheads lack a cooling system to dissipate heat when temperatures are too high. Heat-conducting rods 3 are evenly spaced on the collection box 4, and the internal height of the collecting cavity 5 decreases from both ends towards the middle. The collecting cavity 5 is interconnected with the interior of the fixed cavity 8 via the transmission pipe 6. The two ends of the shape memory metal sheet 9 form a sliding structure with the support plate 10 and the interior of the fixed cavity 8. The top and bottom of the airbag are respectively in contact with the lower end face of the fixing plate 11 and the inner bottom face of the fixing cavity 8; the cooling mechanism includes an airbag 12 disposed on the top surface of the fixing cavity 8, and a one-way air inlet valve 13 is provided on the protective cover 2 above the airbag 12; one-way air supply pipes 14 are fixed at both ends of the airbag 12, and the lower end face of the airbag 12 is a concave structure, and the end of the one-way air supply pipe 14 away from the airbag 12 is fixed on the protective cover 2; the airbag 12 is interconnected with the air supply channel 15 through the one-way air supply pipe 14, and the air supply channel 15 is connected to the connecting cavity 16. It is connected to the air outlet 7; the air supply channel 15 and the connecting cavity 16 are both located on the side of the printhead body 1, and the air outlet 7 is evenly spaced on the inner side of the printhead body 1, and the air outlet 7 has a conical structure; the printhead body 1 generates heat during use, which is collected by the heat conducting rod 3 and transferred to the collection cavity 5 of the collection box 4, and then transferred to the fixed cavity 8 through the transmission pipe 6. The heat comes into contact with the shape memory metal sheet 9. When the heat reaches the value that the shape memory metal sheet 9 can deform, the shape memory metal sheet 9 deforms and bends due to heat. During the bending process The support plate 10 slides between the fixed cavity 8 and the fixed plate 11 to ensure the stability of the shape memory metal sheet 9 during bending. After bending, the shape memory metal sheet 9 can fit into the recess of the air bag 12 and squeeze the air bag 12. In this way, the gas in the air bag 12 can be transmitted to the air supply channel 15 through the one-way air supply pipe 14, and then to the connecting cavity 16. Finally, it can be discharged from the air outlet 7 and blown onto the print head body 1 to cool it down. Since the air outlet 7 has a conical structure, it can make the blown gas stronger and improve the cooling effect.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-cooling thick film thermal printhead, comprising a printhead body (1), a protective cover (2) is provided on the outer side of the printhead body (1), and a collection box (4) is fixed inside the protective cover (2), a heat-conducting rod (3) is passed through the bottom of the collection box (4), and the bottom of the heat-conducting rod (3) is in contact with the upper end face of the printhead body (1), and a collection cavity (5) is provided inside the collection box (4). characterized in that Also includes: The transmission tube (6) is fixedly inserted through the top of the collection box (4). The inside of the print head body (1) is provided with a fixed cavity (8), and a memory metal sheet (9) is provided inside the fixed cavity (8). Both ends of the memory metal sheet (9) are fixed with support plates (10), and a fixed plate (11) is provided on the inner wall of the fixed cavity (8). A cooling mechanism is installed inside the protective cover (2), which automatically dissipates heat from the printhead body (1).

2. A self-cooled thick film thermal printhead according to claim 1 wherein: The heat-conducting rods (3) are evenly distributed on the collection box (4), and the internal height of the collection cavity (5) decreases from both ends to the middle.

3. A self-cooled thick film thermal printhead according to claim 1 wherein: The collection cavity (5) is interconnected with the interior of the transmission pipe (6) and the fixed cavity (8). The two ends of the memory metal sheet (9) form a sliding structure through the support plate (10) and the interior of the fixed cavity (8). The top and bottom of the support plate (10) are in contact with the lower end face of the fixed plate (11) and the inner bottom face of the fixed cavity (8), respectively.

4. A self-cooled thick film thermal printhead according to claim 2 wherein: The cooling mechanism includes an airbag (12) disposed on the top surface of the fixed cavity (8), and a one-way air inlet valve (13) is provided on the protective cover (2) above the airbag (12).

5. A self-cooled thick film thermal printhead according to claim 4 wherein: Both ends of the airbag (12) are fixed with one-way air supply pipes (14), and the lower end of the airbag (12) is a concave structure. The end of the one-way air supply pipe (14) away from the airbag (12) is fixed on the protective cover (2).

6. A self-cooled thick film thermal printhead according to claim 5 wherein: The airbag (12) is connected to the air supply channel (15) via a one-way air supply pipe (14), and the air supply channel (15) is connected to the air outlet (7) via a connecting cavity (16).

7. A self-cooled thick film thermal printhead according to claim 6 wherein: The air supply channel (15) and the connecting cavity (16) are both located on the side of the print head body (1), and the air outlet (7) is equally spaced on the inner side of the print head body (1), and the air outlet (7) has a conical structure.

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