Fabric heat transfer printing equipment

By designing the positioning components and the heat printing module, the problems of cumbersome roll replacement and slow temperature drop in fabric heat transfer equipment have been solved, achieving the effects of simplified installation, improved production efficiency and reduced labor intensity.

CN120840237AInactive Publication Date: 2025-10-28SHAOXING RENXIANG TRANSFER PRINTING CO LTD
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Patent Information

Application Number
CN202511172685.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2025-10-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing fabric heat transfer equipment has a cumbersome roll change process and slow worktable temperature drop, which affects production efficiency and increases the labor intensity of workers.

Method used

The design incorporates a positioning assembly and a heat-printing module, including an automatically positioned positioning compartment and a quick-release heat-printing platen, simplifying roll installation and ensuring uniform double-sided printing and rapid cooling.

Benefits of technology

It simplifies the roll installation process, improves production efficiency, reduces the labor intensity of workers, and ensures fabric quality and production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of fabric heat transfer printing equipment, in particular to fabric heat transfer printing equipment which comprises a supporting frame, the supporting frame is fixedly connected with two sets of limiting frames used for limiting fabric and printing paper and a set of transmission frame, the number of each set of limiting frames is two, and the number of the transmission frame is two. A tensioning cylinder and two first limiting cylinders are rotationally connected to each limiting frame, the number of the transmission frames is two, the transmission frames are arranged between the two limiting frames, a hot stamping module is arranged between the two transmission frames and used for conducting hot stamping on fabric and printing paper which are tightly attached to each other, and the hot stamping module comprises two hot stamping plates moving in the opposite directions. The supporting frame is fixedly connected with the printing paper cylinder and used for conducting double-face hot stamping on the fabric and the printing paper which are tightly attached, the cooling fan is fixedly connected to the supporting frame and used for cooling the fabric subjected to hot stamping, and the clamping assembly is arranged on the supporting frame and used for facilitating positioning of the printing paper cylinder by a worker. According to the technical scheme, the production efficiency of equipment is improved, and the labor intensity of workers is reduced.
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Description

Technical Field

[0001] This invention relates to the field of fabric heat transfer equipment technology, and particularly to a fabric heat transfer equipment. Background Technology

[0002] The background of heat transfer technology can be traced back to the mid-20th century, when printing technology mainly relied on traditional methods such as screen printing and offset printing. These methods were generally complex and inefficient, especially in terms of personalized and small-batch production. The emergence of heat transfer technology provided a solution to these problems. It not only has high precision and clarity, but can also print on a variety of material surfaces, making it particularly suitable for personalized customization and small-batch production.

[0003] Existing fabric heat transfer equipment has several technical problems, primarily the cumbersome roll-up changing process and the slow cooling of the worktable. The roll-up is bolted to the mounting position and operated via a movable shaft, making disassembly and installation complex and affecting the changeover speed. Furthermore, after the heat transfer process, the temperature of the lower worktable cannot drop quickly enough, and the high temperature may continue to heat the transferred pattern, affecting the quality of the fabric and pattern, leading to defective products, increased rework, reduced production efficiency, and increased labor intensity for workers. Summary of the Invention

[0004] The main objective of this invention is to provide a fabric heat transfer printing device that improves the production efficiency of the device and reduces the labor intensity of workers.

[0005] To achieve the above objectives, the present invention proposes a fabric heat transfer printing device, comprising a support frame, on which two sets of limiting frames for limiting the fabric and printing paper and a transmission frame are fixedly connected. Each set of limiting frames consists of two units, and each limiting frame is rotatably connected to a tensioning cylinder and two first limiting cylinders. Each set of transmission frames consists of two units, and the transmission frames are disposed between the two sets of limiting frames. A heat printing module is provided between the two transmission frames for heat printing on the tightly attached fabric and printing paper. The heat printing module includes two heat printing plates that move in opposite directions for double-sided heat printing on the tightly attached fabric and printing paper. A cooling fan is fixedly connected to the support frame to cool the fabric after heat printing. The support frame is equipped with a positioning component to facilitate workers in positioning the printing roller and to protect it.

[0006] In one possible implementation, the locking component includes: A protective compartment is fixedly connected to a support frame. Several rollers are rotatably connected inside the protective compartment. A positioning compartment is provided inside the protective compartment, and the outer wall of the positioning compartment abuts against each of the rollers. Two end caps are slidably connected to both ends of the protective chamber to adjust the axial distance between the two ends of the positioning chamber. Each end cap abuts against the outer wall of both ends of the positioning chamber. Each end cap is rotatably connected to a second limiting cylinder to limit the center of the printing paper roller. One end cap is fixedly connected to a first motor, and the drive shaft of the first motor is fixedly connected to the adjacent second limiting cylinder. The control module is used to drive the positioning compartment and the protective compartment to rotate relative to each other.

[0007] In one possible implementation, the control module includes: A toothed ring, which is fixedly connected to the outer wall of the positioning chamber; A first gear and a second gear mesh with each other, both of which are rotatably connected to the protective chamber, and the second gear meshes with a gear ring. The second motor is fixedly connected inside the protective chamber, and its drive shaft is coaxially and fixedly connected to the second gear.

[0008] In one possible implementation, the outer wall of the second limiting cylinder is provided with a plurality of interval grooves, and a lifting plate is hinged to the inner wall of each interval groove. A limiting post is fixedly connected inside the second limiting cylinder, and a limiting plate is slidably connected to the limiting post. A first linkage plate is hinged between the limiting plate and each lifting plate. A limiting spring is sleeved on the limiting post, and the two ends of the limiting spring abut against the inner wall of the limiting plate and the second limiting cylinder on the side away from the positioning chamber.

[0009] In one possible implementation, the protective compartment is hinged to a disengagement plate on its side.

[0010] In one possible implementation, a handle is fixedly connected to the dislocation plate.

[0011] In one possible implementation, the thermal printing module further includes: A motor base is fixedly connected to a support frame. A linkage disk is rotatably connected to the motor base. A third motor is fixedly connected to the motor base. The drive shaft of the third motor is coaxially fixedly connected to the linkage disk. Two second linkage plates are hinged to the non-center part of the linkage disk. A limit block is hinged to the end of each second linkage plate away from the linkage disk. Each limit block slides and abuts against the transmission frame. Each limit block is fixedly connected to each heat-printing plate.

[0012] This invention's technical solution, through the design of the positioning component, allows workers to simply insert the printing roller along the opening on the long side of the positioning compartment, and the roller will automatically position itself. This simplifies the installation process, avoids tedious disassembly, and reduces operational difficulty. This automatic positioning and simplified installation design eliminates the need for manual alignment, saving significant time and effort, significantly improving equipment production efficiency, and reducing worker workload. Combined with the heat-printing module, it ensures the uniformity and accuracy of double-sided printing. After heat printing, the heat-printing plate quickly detaches from the printing area, accelerating the heat printing process and effectively preventing prolonged contact between the heat-printing plate and the fabric, reducing heat accumulation and protecting the fabric surface from high-temperature damage. Simultaneously, the rapid detachment of the heat-printing plate allows the printed fabric to cool quickly, preventing high temperatures from affecting subsequent processing and fabric quality, maintaining the fabric's softness and elasticity. The rapid detachment and movement of the heat-printing plate increases the speed of the heat printing cycle, enabling more heat printing tasks to be completed per unit time, thereby further improving production efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a fabric heat transfer printing device according to the present invention. Figure 1 ; Figure 2 for Figure 1 Enlarged diagram of A in the middle; Figure 3 This is a schematic diagram of the control module of a fabric heat transfer printing device according to the present invention; Figure 4 This is a schematic diagram of a fabric heat transfer printing device of the present invention, highlighting the second limiting cylinder; Figure 5 This is a schematic diagram of the cooperation between the end cap and the slotting compartment in a fabric heat transfer printing device according to the present invention; Figure 6 This is a schematic diagram illustrating the cooperation between the disengagement plate and the positioning chamber in a fabric heat transfer printing device according to the present invention; Figure 7 This is a schematic diagram of the protective chamber in a fabric heat transfer printing device according to the present invention.

[0015] Description of Figure Numbers: 11. Support frame; 12. Limiting frame; 13. Tensioning cylinder; 14. First limiting cylinder; 15. Transmission frame; 16. Heat-printing plate; 17. Cooling fan; 21. Protective chamber; 22. Roller; 23. Positioning chamber; 24. End cap; 25. Second limiting cylinder; 251. Spacing groove; 252. Lifting plate; 253. Limiting post; 254. Limiting disc; 255. First linkage plate; 256. Limiting spring; 26. First motor; 31. Gear ring; 32. First gear; 33. Second gear; 34. Second motor; 41. Disengagement plate; 42. Handle; 51. Motor base; 52. Linkage disc; 53. Third motor; 54. Second linkage plate; 55. Limiting block.

[0016] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] This invention proposes a fabric heat transfer printing device.

[0019] Reference Figures 1 to 7 The system includes a support frame 11, on which two sets of limiting frames 12 for limiting the fabric and printing paper and a transmission frame 15 are fixedly connected. Each set of limiting frames 12 consists of two units, and each limiting frame 12 is rotatably connected to a tensioning cylinder 13 and two first limiting cylinders 14. Each set of transmission frames 15 consists of two units, and the transmission frames 15 are arranged between the two sets of limiting frames 12. A heat printing module is arranged between the two transmission frames 15 for heat printing the closely attached fabric and printing paper. The heat printing module includes two heat printing plates 16 that move in opposite directions for double-sided heat printing of the closely attached fabric and printing paper. Cooling fan 17 is fixedly connected to support frame 11 and is used to cool the fabric after heat printing. The positioning component is used to facilitate workers in positioning the printing roller and to protect the printing roller. The positioning component is mounted on the support frame 11. The positioning component allows workers to simply insert the printing roller along the opening on the long side of the positioning compartment 23, and the roller will automatically position itself, greatly simplifying the installation process and avoiding tedious disassembly, thus reducing operational difficulty. This automatic positioning and simplified installation design eliminates the need for manual alignment, saving significant time and effort, significantly improving equipment production efficiency, and reducing worker workload. Furthermore, combined with the heat printing module, it ensures uniform and accurate double-sided printing. After heat printing is complete, the heat printing plate 16 quickly detaches from the printing area. This design not only accelerates the heat printing process but also effectively prevents prolonged contact between the heat printing plate 16 and the fabric, reducing heat accumulation and ensuring the fabric surface is not damaged by excessive temperature. In addition, the rapid detachment of the heat printing plate 16 allows the printed fabric to cool down quickly, preventing high temperatures from affecting subsequent processing and fabric quality, maintaining the fabric's softness and elasticity. The rapid detachment and movement of the heat printing plate 16 increases the heat printing cycle speed, meaning more heat printing tasks can be completed per unit time, thereby improving production efficiency.

[0020] Reference Figures 1 to 7 The card slot components include: The protective compartment 21 is fixedly connected to the support frame 11. Several rollers 22 are rotatably connected inside the protective compartment 21. The protective compartment 21 is provided with a locking compartment 23, and the outer wall of the locking compartment 23 abuts against each roller 22. Two end caps 24 are slidably connected to both ends of the protective chamber 21 to adjust the axial distance between the two ends of the positioning chamber 23. Each end cap 24 abuts against the outer wall of both ends of the positioning chamber 23. Each end cap 24 is rotatably connected to a second limiting cylinder 25 to limit the center of the printing paper roller. A first motor 26 is fixedly connected to one of the end caps 24. The drive shaft of the first motor 26 is fixedly connected to the adjacent second limiting cylinder 25. The control module is used to drive the positioning compartment 23 and the protective compartment 21 to rotate relative to each other; The control module in the positioning module causes the positioning chamber 23 and the protective chamber 21 to rotate relative to each other. When the positioning chamber 23 rotates, the end cap 24, which is connected to the groove on the outer wall of the positioning chamber 23, moves towards the positioning chamber 23 under the action of the groove. This squeezing positioning action effectively fixes the printing roller in the positioning chamber 23 into place, ensuring that the printing roller is in the correct position. The worker only needs to insert the printing roller along the opening on the long side of the positioning chamber 23, and the printing roller can be automatically positioned, which greatly simplifies the installation process of the printing roller, avoids tedious disassembly work, and reduces the difficulty of operation. Through this automatic positioning and simplified installation design, the worker does not need to perform manual alignment, saving a lot of time and energy, significantly improving the production efficiency of the equipment, and reducing the labor intensity of the workers. The first motor 26 drives the end cap 24 to rotate, and the end cap 24 drives the squeezed printing roller to rotate synchronously, thereby realizing the stable unwinding of the printing roller. Stable unwinding is the key to ensuring the quality of heat printing, ensuring that the pattern or text on the printed paper remains uniform, and avoiding unstable heat printing effects. Then, in conjunction with the control module, the printing roller is effectively limited, preventing it from falling due to accidental contact or external force, thus maintaining its stability. Simultaneously, other parts within the clamping compartment 23 are also protected, effectively preventing external factors from affecting the printing roller. This effectively prevents dust and contaminants from contaminating the printing paper surface, keeping the paper clean, which helps improve the heat printing effect and ensures consistent printing quality. Furthermore, when the equipment is not in operation, it effectively prevents dust generated during the heat printing process and dust settling in the workshop from contaminating the printing roller surface, ensuring that the printing paper is not contaminated during storage and guaranteeing excellent printing results in subsequent operations.

[0021] Reference Figure 3 The control module includes: Gear ring 31 is fixedly connected to the outer wall of the positioning chamber 23; The first gear 32 and the second gear 33 mesh with each other, and both the first gear 32 and the second gear 33 are rotatably connected to the protective chamber 21. The second gear 33 meshes with the gear ring 31. The second motor 34 is fixedly connected inside the protective chamber 21, and the drive shaft of the second motor 34 is coaxially and fixedly connected to the second gear 33. The second motor 34 in the control module drives the gear ring 31 to rotate, enabling relative rotation between the positioning chamber 23 and the protective chamber 21, thus misaligning their side openings. This achieves several benefits: First, the relative rotation of the positioning chamber 23 and the protective chamber 21 tensions the unwinding section of the printing cylinder located between them, ensuring stable unwinding. Second, it limits the movement of the printing cylinder, preventing it from falling due to accidental contact, ensuring its stability. Simultaneously, other parts within the positioning chamber 23 are protected. This effectively protects the printing cylinder, preventing dust and contaminants from affecting the paper surface, maintaining paper cleanliness, and improving the printing effect. Furthermore, when the equipment is not in operation, it effectively prevents dust generated during the printing process and dust settling in the workshop from contaminating the printing cylinder surface. This ensures that the printing paper is not contaminated during storage, guaranteeing excellent printing results in subsequent operations. Furthermore, the design of the first gear 32 provides sufficient space for the installation of the second motor 34, ensuring ample space for its installation and maintenance. This makes maintenance more convenient for workers, reducing time and operational difficulty. The relative rotational speed between the locking chamber 23 and the protective chamber 21 can be precisely controlled by adjusting the gear ratio of the first gear 32 to the second gear 33, resulting in more stable equipment operation. This prevents excessively high rotational speeds from injuring installation workers and ensures their safety.

[0022] Reference Figures 3 to 4 The outer wall of the second limiting cylinder 25 is provided with several interval slots 251. Each interval slot 251 is hinged to a lifting plate 252. A limiting post 253 is fixedly connected inside the second limiting cylinder 25. A limiting plate 254 is slidably connected to the limiting post 253. A first linkage plate 255 is hinged between the limiting plate 254 and each lifting plate 252. A limiting spring 256 is sleeved on the limiting post 253. The two ends of the limiting spring 256 abut against the inner wall of the limiting plate 254 and the second limiting cylinder 25 on the side away from the locking chamber 23, respectively. By adding lifting plates 252 to the second limiting cylinder 25 and utilizing the spring force of the limiting spring 256, each lifting plate 252 can open outwards. After the printing cylinder is placed on the second limiting cylinder 25, the pressure exerted by the lifting plates 252 on the inner wall of the printing cylinder improves the positioning accuracy and driving effect of the printing cylinder. With the improvement of positioning accuracy, the unwinding action of the printing cylinder becomes more precise, avoiding uneven unwinding or unstable tension caused by cylinder position deviation. This effectively improves production quality and reduces unnecessary downtime and scrap rate in actual production. Precise unwinding control makes the production process smoother, reduces production interruptions caused by mechanical failures or inaccurate operation, and improves work efficiency. At the same time, the improvement of unwinding accuracy also directly affects the quality of the final product, ensuring the consistency and accuracy of paper unwinding.

[0023] Reference Figures 6 to 7 The protective compartment 21 has a disengagement plate 41 hinged to its side; Because the side openings of the protective chamber 21 and the positioning chamber 23 are narrow, it is difficult for workers to quickly disassemble the printing roller. By adding the release plate 41, after the printing paper on the printing roller is completely unwound, the worker can press the area of ​​the release plate 41 that is exposed outside the protective chamber 21, so that one end of the release plate 41 inside the protective chamber 21 can be tilted upward, thereby pushing the printing roller out, which makes it easier for the worker to disassemble the printing roller.

[0024] Reference Figures 6 to 7 A handle 42 is fixedly connected to the dislocation plate 41; The handle 42 design allows users to more easily control the release plate 41, enabling smooth disassembly of the printing roller. When the user rotates or pushes the handle 42, the release plate 41 pushes the printing roller, causing it to disengage smoothly from the locking chamber 23. This design greatly simplifies the disassembly process, reduces the complexity and effort required for manual operation, and makes it more efficient and convenient for workers to maintain or replace the printing roller.

[0025] Reference Figures 1 to 2 The hot stamping module also includes: Motor base 51 is fixedly connected to support frame 11. Linkage disk 52 is rotatably connected to motor base 51. Third motor 53 is fixedly connected to motor base 51. The drive shaft of third motor 53 is coaxially fixedly connected to linkage disk 52. Two second linkage plates 54 are hinged to the non-center part of linkage disk 52. Each second linkage plate 54 has a limit block 55 hinged to the end away from linkage disk 52. Each limit block 55 slides and abuts against transmission frame 15. Each limit block 55 is fixedly connected to each heat printing plate 16. The heat printing module drives the linkage disk 52 via a third motor 53, precisely controlling the opposing movement of the two heat printing plates 16 to achieve double-sided heat printing on both the fabric and the printing paper. The entire process is stably supported by the transmission frame 15, allowing the heat printing plates 16 to slide smoothly along the slots on the frame. During heat printing, the fabric and printing paper are in close contact, ensuring uniform and accurate double-sided printing. After heat printing is complete, the heat printing plates 16 quickly detach from the printing area. This design not only accelerates the heat printing process but also effectively avoids prolonged contact between the heat printing plates 16 and the fabric, reducing heat accumulation and ensuring the fabric surface is not damaged by excessive temperature. Furthermore, the rapid detachment of the heat printing plates 16 allows the printed fabric to cool down quickly, preventing high temperatures from affecting subsequent processing and fabric quality, and maintaining the fabric's softness and elasticity. The rapid detachment and movement of the heat printing plates 16 increases the heat printing cycle speed, meaning more heat printing tasks can be completed per unit time, thus improving production efficiency. This module is designed to be applicable to a variety of fabrics, especially heat-sensitive materials. By adjusting the heating time and temperature of the heat-printing plate 16, damage to special fabrics can be avoided, providing a more personalized solution.

[0026] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fabric heat transfer printing device, comprising a support frame (11), wherein two sets of limiting frames (12) for limiting the fabric and printing paper and a set of transmission frames (15) are fixedly connected to the support frame (11), each set of limiting frames (12) consists of two, and each limiting frame (12) is rotatably connected to a tensioning cylinder (13) and two first limiting cylinders (14), and each set of transmission frames (15) consists of two, and the transmission frames (15) are disposed between the two sets of limiting frames (12), characterized in that, A heat printing module is provided between the two transmission frames (15) for heat printing the tightly attached fabric and printing paper. The heat printing module includes two heat printing plates (16) that move in opposite directions for double-sided heat printing on the tightly attached fabric and printing paper. A cooling fan (17) is fixedly connected to the support frame (11) for cooling the fabric after heat printing. The support frame (11) is equipped with a positioning component, which is used to facilitate workers in positioning the printing roller and to protect the printing roller.

2. The fabric heat transfer printing equipment according to claim 1, characterized in that, The card slot component includes: The protective compartment (21) is fixedly connected to the support frame (11). Several rollers (22) are rotatably connected inside the protective compartment (21). The protective compartment (21) is provided with a positioning compartment (23). The outer wall of the positioning compartment (23) abuts against each of the rollers (22). Two end caps (24) are slidably connected to both ends of the protective chamber (21) to adjust the axial distance between the two ends of the positioning chamber (23). Each end cap (24) abuts against the outer wall of both ends of the positioning chamber (23). Each end cap (24) is rotatably connected to a second limiting cylinder (25) to limit the center of the printing paper roller. A first motor (26) is fixedly connected to one of the end caps (24). The drive shaft of the first motor (26) is fixedly connected to the adjacent second limiting cylinder (25). The control module is used to drive the positioning compartment (23) and the protective compartment (21) to rotate relative to each other.

3. The fabric heat transfer printing equipment according to claim 2, characterized in that, The control module includes: A toothed ring (31) is fixedly connected to the outer wall of the positioning chamber (23); The first gear (32) and the second gear (33) mesh with each other, and both the first gear (32) and the second gear (33) are rotatably connected to the protective chamber (21). The second gear (33) meshes with the gear ring (31). The second motor (34) is fixedly connected inside the protective chamber (21), and the drive shaft of the second motor (34) is coaxially fixedly connected to the second gear (33).

4. The fabric heat transfer printing equipment according to claim 2, characterized in that, The outer wall of the second limiting cylinder (25) is provided with several interval grooves (251), and each interval groove (251) is hinged with a lifting plate (252). A limiting post (253) is fixedly connected inside the second limiting cylinder (25). A limiting plate (254) is slidably connected on the limiting post (253). A first linkage plate (255) is hinged between the limiting plate (254) and each lifting plate (252). A limiting spring (256) is sleeved on the limiting post (253). The two ends of the limiting spring (256) abut against the inner wall of the limiting plate (254) and the second limiting cylinder (25) on the side away from the positioning chamber (23).

5. The fabric heat transfer printing equipment according to claim 2, characterized in that, The protective compartment (21) has a disengagement plate (41) hinged to its side.

6. The fabric heat transfer printing equipment according to claim 5, characterized in that, A handle (42) is fixedly connected to the dislocation plate (41).

7. The fabric heat transfer printing equipment according to claim 1, characterized in that, The hot stamping module also includes: A motor base (51) is fixedly connected to a support frame (11). A linkage disk (52) is rotatably connected to the motor base (51). A third motor (53) is fixedly connected to the motor base (51). The drive shaft of the third motor (53) is coaxially fixedly connected to the linkage disk (52). Two second linkage plates (54) are hinged at the non-center position of the linkage disk (52). A limit block (55) is hinged to the end of each second linkage plate (54) away from the linkage disk (52). Each limit block (55) slides and abuts against the transmission frame (15). Each limit block (55) is fixedly connected to each heat-printing plate (16).