Heating device for fixing of laser printer

Abstract

The utility model discloses a heating device for fixing of a laser printer. Comprising the following improvements on the form of a traditional roller body 3 and heating pieces 5 arranged in the traditional roller body 3: a reducing mechanism 4 is additionally arranged in the roller body 3, and the mechanism can dynamically adjust the arrangement of the heating pieces 5 when the roller body rotates. The heating pieces 5 are arranged in the roller body 3 in an annular array mode, and the diameter of a circle defined by the heating pieces 5 is accurately adjusted through the diameter changing mechanism 4. In addition, gaps between the heating pieces 5 are filled with the heat conduction pieces 6, and the design enables heat to be transferred and distributed in the roller body 3 more effectively. The utility model belongs to the technical field of laser printers. According to the utility model, the halogen lamp tube is used as a heating element, and the rotary actuator is combined to accurately control the roller body and the reducing mechanism, so that the surface temperature of the heating roller is accurately adjusted. The accurate temperature control is beneficial for ensuring the fixing effect in the printing process and improving the printing quality.

Description

Technical Field

[0001] The invention relates to the technical field of laser printers, specifically to the technical field of heating rollers of fixing units, and particularly to a heating device for fixing laser printers. Background Art

[0002] During the printing process, a laser printer transfers the toner image to the paper via the photosensitive drum. However, the toner image is not yet fixed and requires a fusing process to permanently fix it to the paper. The main principle of fusing is that heat from a heated roller melts the resin in the toner. This heat is then applied to the paper, and the toner is firmly pressed together with the carbon powder to form a permanent image.

[0003] However, for toner images of different sizes, if the heating roller of the fixing device is too high or too low, it will have certain adverse effects:

[0004] When the heating roller temperature is too high, the toner may melt excessively, causing the toner image to diffuse and blur the edges, thus affecting print quality. While the temperature of the halogen lamp built into traditional heating rollers is controllable, when heat is transferred to the heating roller surface, the polytetrafluoroethylene coating on the heating roller surface, while having excellent heat resistance and non-stick properties, also affects the conduction and distribution of heat. Therefore, it is difficult to precisely control the fusing temperature on the heating roller surface simply by controlling the temperature of the halogen lamp. Therefore, traditional technology typically limits halogen lamps to around 150-180°C. However, this limitation also means that optimal printing results may not be achieved in certain printing tasks that require higher fusing temperatures.

[0005] For this reason, the present invention proposes a laser printer fixing heating device. Utility Model Content

[0006] In view of this, the present invention aims to provide a laser printer fusing heating device to solve or alleviate the technical problem existing in the prior art, namely, how to optimize and control the heating temperature of the heating roller, and to provide at least a useful option for this problem. The technical solution of the present invention is achieved as follows:

[0007] A laser printer fusing heating device comprises a conventional roller body 3 and a heating element 5 disposed therein, with the following improvements: a diameter-changing mechanism 4 is added to the roller body 3, which dynamically adjusts the arrangement of the heating elements 5 as the roller body rotates. The heating elements 5 are arranged in a circular array within the roller body 3, and the diameter-changing mechanism 4 enables precise adjustment of the diameter of the circle they form. Furthermore, the gaps between the heating elements 5 are filled with heat conductors 6. This design enables more efficient heat transfer and distribution within the roller body 3. The density and heat distribution of the heat conductors 6 can be dynamically adjusted to accommodate the changes in the diameter of the heating elements 5, thereby achieving precise control of the surface temperature distribution of the roller body 3.

[0008] In one embodiment, the diameter-changing mechanism 4 is composed of a first cylinder 401 and a second cylinder 402, and there is a rotational fit relationship between the two. A plurality of sliders 403 are arranged in a circular array inside the second cylinder 402. The number of these sliders is the same as the number of the heating elements 5, and there is a sliding fit relationship between them and the second cylinder 402. Each slider 403 is connected to the corresponding heating element 5 through a connecting frame 404. When the second cylinder 402 rotates, the slider 403 will extend or retract into the second cylinder 402 according to the direction of rotation, thereby achieving the adjustment of the diameter of the circle surrounded by the heating element 5, that is, the diameter-changing adjustment.

[0009] In one embodiment, the second cylinder 402 is provided with linear racks 4021 of the same number as the heating elements 5. These linear racks 4021 provide sliding tracks for the slider 403, so that the slider 403 can slide along a specific linear track inside the second cylinder 402. At the same time, the surface of the first cylinder 401 is provided with sliding grooves 4011 of the same number as the heating elements 5. Moving pins 4031 are fixed on the slider 403, and there is a sliding fit relationship between these moving pins 4031 and the sliding grooves 4011. When the second cylinder 402 rotates relative to the first cylinder 401, the moving pins 4031 will slide along the track of the sliding grooves 4011, thereby driving the slider 403 to slide on the linear racks 4021 inside the second cylinder 402. This design plans the moving track and direction of the slider 403, so that the heating element 5 can be adjusted in diameter in a predetermined manner.

[0010] In one embodiment, a circular array of partitioning frames 7 is arranged within the roller body 3. These partitioning frames 7 effectively separate the heating element 5 and the heat conducting element 6, ensuring that their respective functions and performance are not interfered with. The partitioning frames 7 are made of aluminum alloy, which offers excellent thermal conductivity and mechanical strength, meeting the requirements of its use. Furthermore, the heat conducting element 6 is filled with polytetrafluoroethylene, a material with excellent heat resistance and chemical stability, effectively transferring and distributing heat.

[0011] In one embodiment, the present invention further includes a frame 1 provided at the left and right ends of the roller body 3 and a rotary actuator 2 mounted on the frame 1. The rotary actuator 2, such as a servo motor, is used to control the rotation of the roller body 3 and the diameter-changing mechanism 4. Two diameter-changing mechanisms 4 are symmetrically provided at both ends of the roller body 3 to achieve more uniform diameter adjustment. One of the rotary actuators 2 is responsible for controlling the rotation of one end of the roller body 3, while the other end of the roller body 3 is mounted on the frame 1 closest to it through a rotational fit. The other rotary actuator 2 is specifically used to control the rotation of the second cylinder 402 in a diameter-changing mechanism 4. At the same time, the first cylinder 401 in the diameter-changing mechanism 4 is fixedly mounted on the frame 1 closest to it.

[0012] In one embodiment, the surface of the roller 3 is coated with a polytetrafluoroethylene (PTFE) coating. This coating is chosen for its excellent heat resistance, chemical stability, and low friction coefficient, protecting the roller 3 from high temperatures and chemicals while reducing friction with the printing material, thereby improving print quality. Furthermore, a halogen lamp is used as the heat source for the heater 5. Halogen lamps are widely used in various heating devices due to their efficient and stable heating performance. They generate heat quickly and evenly, meeting the temperature requirements of the laser printer fusing process.

[0013] Compared with the prior art, the beneficial effects of this novel method are:

[0014] 1. Temperature Control: This new model uses a halogen lamp as the heating element, combined with a rotary actuator to precisely control the roller body and the diameter-changing mechanism, to achieve precise regulation of the heating roller surface temperature. This precise temperature control helps ensure the best fixing effect during printing and improves print quality.

[0015] Second, strong adaptability: The design of this novel variable diameter mechanism enables the heating device to be flexibly adjusted to suit the different sizes of toner images. Whether printing small or large images, the arrangement and spacing of the heating elements can be adjusted to achieve uniform heating, thus meeting different printing requirements.

[0016] 3. Efficient and Stable Heating Performance: This new halogen lamp, used as the heating element, offers efficient and stable heating performance. It quickly converts electrical energy into heat and evenly distributes it across the roller, ensuring precise and stable temperature control during the fusing process. This helps improve printing efficiency and reduces print quality issues caused by temperature fluctuations.

[0017] 4. Protect the Roller and Extend its Service Life: The polytetrafluoroethylene coating on the surface of this new roller offers excellent heat resistance, chemical stability, and a low coefficient of friction. This coating effectively protects the roller from high temperatures and chemicals, reducing damage caused by friction and corrosion. This extends the service life of the heating device and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a three-dimensional schematic diagram of the new model;

[0020] Figure 2 This is a three-dimensional diagram of the internal structure of the new model after the roller body is hidden;

[0021] Figure 3 This is a schematic diagram of the internal structure of the new model after the roller body is hidden from another perspective;

[0022] Figure 4 This is a three-dimensional schematic diagram of the arrangement mode of the heating element of this novel invention;

[0023] Figure 5 This is a three-dimensional schematic diagram of the new diameter-changing mechanism.

[0024] Figure numerals: 1, frame; 2, rotary actuator; 3, roller body; 4, diameter-changing mechanism; 401, first cylinder; 4011, slide groove; 402, second cylinder; 4021, linear frame; 403, slider; 4031, movable pin; 404, connecting frame; 5, heating element; 6, heat-conducting element; 7, dividing frame. DETAILED DESCRIPTION

[0025] To make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar improvements without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] See also Figure 1-5This embodiment discloses a laser printer fixing heating device, which includes a conventional roller body 3 and a heating element 5 disposed therein, with the following improvements: a diameter reducing mechanism 4 is disposed within the roller body 3; and a heat conducting element 6 is filled in the gaps between the heating elements 5 within the roller body 3;

[0027] During the rotation of the roller body 3, the diameter-changing mechanism 4 can control the diameter of the circle surrounded by all the heating elements 5 arranged in a ring array inside the roller body 3 to be adjusted;

[0028] The density and heat distribution of the heat conducting member 6 are dynamically changed and adjustable during the process of the diameter adjustment of the heating member 5 , thereby making the temperature distribution on the surface of the roller body 3 adjustable.

[0029] Specifically: The core of this technology lies in the design and application of the variable diameter mechanism 4 and the heat conductor 6. The variable diameter mechanism 4 adjusts the arrangement and spacing of the heating elements 5 in real time according to the requirements of the printing task, thereby changing the diameter of the circle they form. This variable diameter capability allows the heating elements 5 to more flexibly adapt to the temperature distribution requirements of different printing tasks. The heat conductor 6 plays a role in heat transfer and distribution. The dynamic adjustability of its density and heat distribution ensures that heat can be transferred evenly and effectively within the roller 3, thereby achieving precise control of the roller surface temperature. This design principle improves printing quality and efficiency while reducing printing problems caused by uneven temperature.

[0030] It can be understood that in the above solution: from an application perspective, the fixing effect of the laser printer is significantly improved. Through the dynamic adjustment of the variable diameter mechanism 4, the heating element 5 can more accurately control the temperature distribution on the surface of the roller body 3, so that the toner can be melted and adhered to the paper evenly and firmly during the fixing process. This not only improves the print quality, but also reduces problems such as toner diffusion and blurred edges caused by uneven temperature. At the same time, the design of the heat conductor 6 further enhances the heat transfer and distribution effect, making the printing process more efficient and stable. Overall, this technology brings higher print quality and more stable printing performance to laser printers.

[0031] In some specific embodiments of this application, please refer to Figures 3-5 The diameter-changing mechanism 4 includes a first cylindrical body 401 and a second cylindrical body 402 that rotatably engages with the first cylindrical body 401. The second cylindrical body 402 includes sliders 403 arranged in a circular array and slidably engaged therewith, the same number as the heating elements 5. The sliders 403 are connected to the heating elements 5 via a connecting bracket 404. When the second cylindrical body 402 rotates, the sliders 403 extend or retract within the second cylindrical body 402 depending on the direction of rotation, achieving diameter adjustment.

[0032] Specifically, the principle of this embodiment is primarily based on mechanical motion using sliding and rotational fit. The rotation of the second cylinder 402 is converted into the extension or retraction of the slider 403 through the sliding fit between the slider 403 and the second cylinder 402. This conversion enables the relative position of the heating element 5 to be changed, thereby achieving variable diameter adjustment. The connecting frame 404, serving as the connecting component between the slider 403 and the heating element 5, ensures their synchronous movement, allowing the heating element 5 to accurately follow the movement of the slider 403.

[0033] It can be understood that in the above scheme: from the application level, this embodiment enables the diameter-changing mechanism 4 to more flexibly adjust the arrangement and spacing of the heating elements 5, thereby adapting to the temperature distribution requirements of different printing tasks. By simply rotating the second cylinder 402, the diameter of the circle surrounded by the heating element 5 can be continuously adjusted, thereby achieving precise control of the surface temperature distribution of the roller body 3. This design not only improves the printing quality and efficiency, but also makes the operation of the heating device simpler and faster. At the same time, due to the sliding fit relationship between the slider 403 and the second cylinder 402, this embodiment also has a certain degree of adaptability, and can compensate to a certain extent for the position deviation of the heating element 5 caused by factors such as temperature changes or mechanical wear.

[0034] It should be noted that precise control of the surface temperature of the roller 3 is achieved through precise adjustment of the heating element 5, heat conduction, and a possible feedback control system. By precisely controlling the heat output and distribution of the heating element, combined with the thermal conductivity of the roller material, precise control of the roller surface temperature can be achieved. As mentioned above, by adjusting the arrangement and spacing of the heating elements 5, the heat output of the heating area can be precisely controlled. This helps to form a uniform or specifically distributed temperature field on the roller surface. The multi-layer structure of the heat conducting element 5 of this design embeds temperature control elements (heating elements 5) between different layers, which can monitor and adjust the heat transfer efficiency of each layer in real time (such as built-in thermal sensors), thereby achieving dynamic control of heat distribution.

[0035] In some specific embodiments of this application, please refer to Figures 3-5 : The second cylinder 402 is provided with linear frames 4021 having the same number as the heating elements 5, and the slider 403 is slidably fitted in the linear frames 4021;

[0036] The surface of the first cylinder 401 is provided with the same number of sliding grooves 4011 as the number of the heating elements 5. The slider 403 is fixed with a moving pin 4031, which slides in the sliding grooves 4011. This determines the movement trajectory and direction of the slider 403.

[0037] Specifically: The principle of this embodiment is mainly based on sliding fit and trajectory planning. The linear frame 4021 provides a stable sliding track for the slider 403, ensuring the stability and accuracy of the slider 403 during the sliding process. The sliding fit relationship between the slide 4011 and the movable pin 4031 plays a role in trajectory planning, allowing the slider 403 to slide according to a predetermined trajectory and direction. When the second cylinder 402 rotates, the movable pin 4031 will slide along the trajectory of the slide 4011, thereby driving the slider 403 to slide on the linear frame 4021, thereby realizing the variable diameter adjustment of the heating element 5.

[0038] It is understood that in the above-described solution, from an application perspective, this embodiment enables the variable diameter mechanism 4 to more precisely control the movement trajectory and direction of the heating element 5. By planning the movement trajectory and direction of the slider 403, the arrangement and spacing of the heating elements 5 can be precisely adjusted, thereby meeting the temperature distribution requirements of different printing tasks. At the same time, due to the design of the linear frame 4021 and the slide 4011, this embodiment also has a certain degree of stability and reliability, capable of maintaining high precision and stability during long-term use. This design not only improves printing quality and efficiency, but also extends the service life of the heating device.

[0039] In some specific embodiments of this application, please refer to Figures 3-5 : A dividing frame 7 is provided in an annular array in the roller body 3, and the dividing frame 7 divides the heating element 5 and the heat conducting element 6. The dividing frame 7 is made of aluminum alloy, and the heat conducting element 6 is a polytetrafluoroethylene filler.

[0040] Specifically, the partition frame 7 effectively separates the heating element 5 and the heat conductor 6, preventing direct contact and mutual interference between them. This allows the heating element 5 to focus on generating heat, while the heat conductor 6 transfers heat evenly to the roller 3. The aluminum alloy partition frame 7 not only offers excellent thermal conductivity but can also withstand high temperatures and mechanical stress, ensuring its stability and durability. The heat conductor 6, filled with polytetrafluoroethylene, leverages its excellent heat resistance and chemical stability to achieve efficient heat transfer and distribution.

[0041] It is understood that in the above scheme, the provision of the partition frame 7 effectively isolates the heating element 5 and the heat conductor 6, preventing mutual influence and interference between them. This enables the heating element 5 to generate heat more efficiently, while the heat conductor 6 can transfer heat to the roller 3 more evenly. The aluminum alloy partition frame 7 and the polytetrafluoroethylene-filled heat conductor 6 work together to achieve effective heat management and control, improving printing quality and efficiency. This design also enhances the stability and durability of the heating device, extending its service life.

[0042] In some specific embodiments of this application, please refer to Figures 3-5 : It also includes a frame 1 provided at the left and right ends of the roller body 3 and a rotary actuator 2 installed thereon, and the rotary actuator 2 (such as a servo motor) is used to control the rotation of the roller body 3 and the diameter-changing mechanism 4;

[0043] Two diameter-changing mechanisms 4 are symmetrically provided at both ends of the roller body 3 .

[0044] A rotary actuator 2 controls the rotation of one end of the roller body 3, and the other end of the roller body 3 is rotatably fitted on the frame 1 closest to it;

[0045] Another rotary actuator 2 controls the rotation of a second cylinder 402 in a diameter-changing mechanism 4 , and the first cylinder 401 in the diameter-changing mechanism 4 is fixed on the frame 1 closest thereto.

[0046] Furthermore, the rotation functions between the roller body 3 and the diameter-changing mechanism 4 are isolated from each other, and the diameter-changing mechanism 4 can be flexibly controlled in practice.

[0047] Furthermore, the second cylinder 402 of the diameter-changing mechanism 4 is connected to the output shaft of the servo motor. Meanwhile, the end face of the roller body 3 at the other diameter-changing mechanism 4 is configured as a closed surface, which is then connected to and driven by the output shaft of the servo motor to rotate the roller body 3. The main function of the other diameter-changing mechanism 4 within the roller body 3 is to support the heating element 5 for diameter adjustment.

[0048] Specifically, this embodiment is based on a design combining rotational control and mechanical isolation. By providing two rotary actuators 2, the rotation of the roller 3 and the reducing mechanism 4 can be independently controlled, achieving mutual isolation between their rotational functions. This design allows for more flexible control of the reducing mechanism 4 in practical applications without affecting the rotation of the roller 3. Furthermore, by securely mounting the first cylinder 401 of the reducing mechanism 4 on the frame 1, the stability of the reducing mechanism 4 during rotation is ensured.

[0049] It can be understood that, in the above scheme, from an application perspective, this implementation provides greater flexibility and control precision. By separately controlling the rotation of the roller 3 and the reducing mechanism 4, the arrangement and spacing of the heating elements 5 can be more precisely adjusted, thereby achieving precise control of the surface temperature distribution of the roller 3. This design not only improves printing quality and efficiency, but also enables the heating device to adapt to a wider range of printing tasks. Furthermore, since the rotation functions of the roller 3 and the reducing mechanism 4 are isolated from each other, maintenance and component replacement are more convenient and faster.

[0050] In some specific embodiments of this application, please refer to Figures 3-5 The surface of the roller body 3 is coated with a polytetrafluoroethylene coating. The heating element 5 is a halogen lamp.

[0051] Specifically, the polytetrafluoroethylene coating is chosen for its unique physical and chemical properties. It maintains stability in the presence of high temperatures and chemicals, thus protecting roller 3 from damage. Its low coefficient of friction also helps reduce friction with the printing material, lowering resistance during printing and improving print quality. Halogen lamps are chosen as heating element 5 for their efficient heating performance and stable heat output. Halogen lamps quickly convert electrical energy into heat and evenly distribute it across roller 3, ensuring precise and stable temperature control during the fusing process.

[0052] Preferably, the halogen lamp is powered by an electric slip ring provided on the first cylinder 401, thereby preventing the halogen lamp from being entangled with the wires. Meanwhile, the halogen lamp can also be powered by a built-in battery, which can also prevent the wires from being entangled.

[0053] It is understood that in the above-described solution, from an application perspective, this implementation significantly improves the performance and service life of the laser printer fuser heating device. The polytetrafluoroethylene coating effectively protects the roller body 3, enabling it to operate stably and for extended periods in high-temperature and chemical environments, reducing damage caused by friction and corrosion. The use of a halogen lamp as the heating element 5 provides efficient and stable heating performance, ensuring temperature control accuracy and print quality during the fuser process. This design not only improves printing efficiency and quality, but also reduces maintenance costs and failure rates, extending the service life of the heating device.

[0054] In summary, in response to the related problems in the conventional technology, this specific embodiment, based on the above-mentioned laser printer fixing heating device, adopts the following technical means or features to achieve a solution:

[0055] (1) Optimizing and controlling the heating roller's temperature: By providing two rotary actuators 2 to control the rotation of the roller 3 and the diameter-changing mechanism 4, respectively, the relative position between the heating element 5 (halogen lamp) and the roller 3 can be precisely adjusted, thereby controlling the intensity and distribution of the heating. The polytetrafluoroethylene coating on the surface of the roller 3 not only provides excellent heat resistance but also ensures more efficient heat transfer to the printing material while minimizing heat loss.

[0056] (2) Adapting to Different Toner Image Sizes: The design of the variable diameter mechanism 4 allows the arrangement and spacing of the heating elements 5 to be adjusted according to the size of the toner image. When printing a smaller toner image, the variable diameter mechanism 4 can be adjusted to reduce the diameter of the circle formed by the heating elements 5, thereby reducing the heating intensity in that area. Conversely, when printing a larger toner image, the diameter of the circle formed by the heating elements 5 can be increased to improve heating efficiency and ensure that the entire toner image is evenly and appropriately heated.

[0057] The above embodiments merely illustrate practical implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present patent shall be determined by the appended claims.

Claims

1. A heating device for fixing a laser printer, comprising a roller body (3) and a heating element (5) disposed therein, characterized in that: A diameter-changing mechanism (4) is provided in the roller body (3); and a heat-conducting member (6) is filled in the gaps between the heating elements (5) in the roller body (3); During the rotation of the roller body (3), the diameter-changing mechanism (4) can control the diameter-changing adjustment of a circle surrounded by all the heating elements (5) arranged in a ring array inside the roller body (3); The density and heat distribution of the heat conducting element (6) dynamically follow the changes and are adjustable during the process of the heating element (5) performing diameter adjustment.

2. The heating device according to claim 1, characterized in that: The diameter-changing mechanism (4) comprises a first cylinder (401) and a second cylinder (402) rotatably engaged therewith, wherein sliders (403) are arranged in an annular array in the second cylinder (402) and slidably engaged therewith, and the sliders (403) are connected to the heating element (5).

3. The heating device according to claim 2, characterized in that: The second cylinder (402) is provided with a linear frame (4021) therein, and the slider (403) is slidably fitted on the linear frame (4021); A sliding groove (4011) is provided on the surface of the first cylinder (401), and a movable pin (4031) is fixed on the slider (403), and the movable pin (4031) is slidably fitted in the sliding groove (4011).

4. The heating device according to claim 1, characterized in that: A dividing frame (7) is provided in an annular array inside the roller body (3), and the dividing frame (7) divides the heating element (5) and the heat conducting element (6) into separate parts.

5. The heating device according to claim 4, characterized in that: The dividing frame (7) is made of aluminum alloy, and the heat conducting member (6) is a polytetrafluoroethylene filler.

6. The heating device according to claim 2, characterized in that: It also includes a frame (1) provided at the left and right ends of the roller body (3) and a rotary actuator (2) mounted thereon, wherein the rotary actuator (2) is used to control the rotation of the roller body (3) and the diameter-changing mechanism (4); Two diameter-changing mechanisms (4) are symmetrically provided at both ends of the roller body (3).

7. The heating device according to claim 6, characterized in that: A rotary actuator (2) controls the rotation of one end of the roller body (3), and the other end of the roller body (3) is rotationally engaged with the frame (1) closest thereto; Another rotary actuator (2) controls the rotation of the second cylinder (402) in one of the diameter-changing mechanisms (4), and the first cylinder (401) in the diameter-changing mechanism (4) is fixed on the frame (1) closest to it.

8. The heating device according to claim 7, characterized in that: The rotary actuator (2) is a servo motor.

9. The heating device according to any one of claims 1 to 8, characterized in that: The surface of the roller body (3) is coated with a polytetrafluoroethylene coating.

10. The heating device according to any one of claims 1 to 8, characterized in that: The heating element (5) is a halogen lamp.

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