Transmission mechanism and 3D printer

Abstract

The utility model discloses a transmission mechanism and a 3D printer. The transmission mechanism comprises a first synchronous belt assembly and a second synchronous belt assembly, the first synchronous belt assembly and the second synchronous belt assembly are configured to jointly drive the printing mechanism to move along a plane defined by a first direction and a second direction, and the first direction is perpendicular to the second direction; the first synchronous belt assembly comprises a first driving part, a second driving part and a first synchronous belt, and the first driving part and the second driving part jointly drive the first synchronous belt to move; the second synchronous belt assembly comprises a third driving part, a fourth driving part and a second synchronous belt, and the third driving part and the fourth driving part jointly drive the second synchronous belt to move; the first synchronous belt and the second synchronous belt are distributed at intervals in the third direction, and the two ends of the first synchronous belt and the second synchronous belt are connected to the printing mechanism. The transmission mechanism is simple in structure, large in transmission driving force and suitable for devices with large transmission distances such as large-size 3D printers.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and in particular to a transmission mechanism and a 3D printer. Background Technology

[0002] 3D printers include a transmission mechanism for driving the 3D print head to move along the XY plane, enabling the 3D print head to perform layer-by-layer printing. Existing 3D printers use transmission mechanisms based on transmission belts; however, when applied to large-format 3D printers, this type of transmission mechanism suffers from insufficient driving torque due to the excessive length of the transmission belt and the large transmission distance, resulting in poor transmission performance and insufficient driving force on the 3D print head, thus affecting the quality of the 3D print.

[0003] Therefore, it is essential to provide a transmission mechanism and 3D printer that can improve transmission efficiency and increase the driving force on the 3D printing head. Utility Model Content

[0004] The purpose of this application is to solve the above problems and provide a transmission mechanism and a 3D printer; the transmission mechanism has a simple structure, large transmission driving force, and is suitable for devices with a large transmission distance, including large-size 3D printers.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a transmission mechanism including a first synchronous belt assembly and a second synchronous belt assembly, the first synchronous belt assembly and the second synchronous belt assembly being configured to jointly drive a printing mechanism to move along a plane enclosed by a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other; the first synchronous belt assembly includes a first driving member, a second driving member and a first synchronous belt, the first driving member and the second driving member being configured to jointly drive the first synchronous belt to move; the second synchronous belt assembly includes a third driving member, a fourth driving member and a second synchronous belt, the third driving member and the fourth driving member being configured to jointly drive the second synchronous belt to move; the first synchronous belt and the second synchronous belt are spaced apart along a third direction, and the opposite ends of the first synchronous belt are respectively connected to the printing mechanism, and the opposite ends of the second synchronous belt are respectively connected to the printing mechanism.

[0007] Optionally, the transmission mechanism further includes a first guide rail, a second guide rail, and a third guide rail. The first guide rail extends along the first direction, and the second and third guide rails are spaced apart along the second direction. A first slider is disposed between the first and third guide rails, and a second slider is disposed between the first and second guide rails. A first synchronous belt is wound around the first and second sliders, and a second synchronous belt is wound around the first and second sliders. The first guide rail is configured to mount the printing mechanism.

[0008] Optionally, the transmission mechanism further includes a bracket that encloses a rectangular area. The first and second synchronous belt assemblies are configured to jointly drive the printing mechanism to move within the rectangular area. The second and third guide rails form two opposite sides of the rectangular area. The bracket includes a first and a second bracket located at one set of diagonal points of the rectangular area, and a third and a fourth bracket located at another set of diagonal points of the rectangular area. The first and fourth brackets are located at opposite ends of the second guide rail, and the second and third brackets are located at opposite ends of the third guide rail. The first and third brackets are arranged adjacent to each other. The first synchronous belt passes through the first, second, third, and fourth brackets, and the second synchronous belt passes through the first, second, third, and fourth brackets.

[0009] Optionally, the first driving member is disposed on the first bracket, the second driving member is disposed on the second bracket, the third driving member is disposed on the third bracket, and the fourth driving member is disposed on the fourth bracket; the first slider is disposed between the second driving member and the third driving member, and the second slider is disposed between the first driving member and the fourth driving member; each of the first bracket, the second bracket, the third bracket, and the fourth bracket is provided with a synchronous pulley, and the synchronous pulley is configured to be connected to the first synchronous belt or the second synchronous belt for transmission, so that the first synchronous belt and the second synchronous belt extend along the outer periphery of the rectangular area.

[0010] Optionally, when the first bracket and the third bracket are respectively provided with synchronous pulleys, the synchronous pulley on the first bracket is used to drive the second synchronous belt, and the synchronous pulley on the third bracket is used to drive the first synchronous belt.

[0011] Optionally, the first slider is provided with a first synchronous pulley, which is connected to the first synchronous belt; the second slider is provided with a second synchronous pulley, which is connected to the second synchronous belt; the first synchronous pulley is positioned above the second synchronous pulley along a third direction; the rotating ends of the first driving member and the second driving member are respectively provided with first drive pulleys, which are connected to the first synchronous belt; the rotating ends of the third driving member and the fourth driving member are respectively provided with second drive pulleys, which are connected to the second synchronous belt.

[0012] Optionally, the first slider is provided with a first rotating shaft, and the second slider is provided with a second rotating shaft; the first synchronous pulley is located on the upper part of the first rotating shaft, and the second synchronous pulley is rotatably connected to the lower part of the second rotating shaft.

[0013] Optionally, the transmission mechanism further includes a first tensioning component and a second tensioning component. The first tensioning component includes a first idler pulley and a first limiting member. The first synchronous belt is sleeved on the first idler pulley. The first limiting member is used to adjust the position of the first idler pulley and to limit and fix the first idler pulley. The first idler pulley and the first limiting member together are used to tension the first synchronous belt. The second tensioning component includes a second idler pulley and a second limiting member. The second synchronous belt is sleeved on the second idler pulley. The second limiting member is used to adjust the position of the second idler pulley and to limit and fix the second idler pulley. The second idler pulley and the second limiting member together are used to tension the second synchronous belt.

[0014] Secondly, this application provides a 3D printer, which includes a frame, a printing mechanism, and a transmission mechanism as described above. The transmission mechanism is supported on the frame and is used to drive the printing mechanism to move in a planar area enclosed by the first direction and the second direction.

[0015] Optionally, the printing mechanism includes a print head with a print nozzle, the print head being slidably connected to a first guide rail, and the first synchronous belt and the second synchronous belt being respectively connected to opposite sides of the print head.

[0016] The beneficial effects of this application include at least the following:

[0017] The transmission mechanism described in this application includes a first synchronous belt assembly and a second synchronous belt assembly. The first synchronous belt assembly includes a first driving member, a second driving member, and a first synchronous belt jointly driven by the first and second driving members. The second synchronous belt assembly includes a third driving member, a fourth driving member, and a second synchronous belt jointly driven by the third and fourth driving members. The first and second driving members jointly drive the first synchronous belt to rotate, and the third and fourth driving members jointly drive the second synchronous belt to rotate. The printing mechanism moves along a plane enclosed by the first and second directions under the joint drive of the first and second synchronous belt assemblies. In the transmission mechanism described in this application, the structure of multiple driving members jointly driving the synchronous belt provides a large driving force for the transmission of the synchronous belt, overcoming the defects of excessive synchronous belt extension length, insufficient driving torque, and poor transmission effect in large-size 3D printers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the transmission mechanism of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the first and second synchronous belt components;

[0020] Figure 3 A schematic diagram of a bracket equipped with a synchronous belt pulley;

[0021] Figure 4 A schematic diagram of a bracket without a timing pulley;

[0022] Figure 5 This is a schematic diagram of the structure of the first slider;

[0023] Figure 6 This is a schematic diagram of the structure of a 3D printer.

[0024] Among them, 1-transmission mechanism, 11-first synchronous belt assembly, 111-first driving component, 112-second driving component, 113-first synchronous belt, 114-first drive pulley, 115-first tensioning assembly, 1151-first idler pulley, 1152-first limiting component, 12-second synchronous belt assembly, 121-third driving component, 122-fourth driving component, 123-second synchronous belt, 124-second drive pulley, 125-second tensioning assembly, 1251-second idler pulley, 1252-second limiting component, 13-bracket, 1 31-First support, 132-Second support, 133-Third support, 134-Fourth support, 14-First slider, 141-First rotating shaft, 15-Second slider, 151-Second rotating shaft, 16-Synchronous pulley, 17-First synchronous pulley, 18-Second synchronous pulley, 101-First guide rail, 102-Second guide rail, 103-Third guide rail, 2-Printing mechanism, 21-Print head, 211-Print nozzle, 22-Heat sink, 3-Frame, x-First direction, y-Second direction, z-Third direction. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0026] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component present.

[0027] In this application, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0028] In the description of this application, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. They 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, and therefore should not be construed as a limitation of this application. It should be noted that in this application, the first direction, the second direction, and the third direction are mutually perpendicular in space, corresponding to the X-axis, Y-axis, and Z-axis of the spatial coordinate system, respectively; the direction of "up" refers to the direction away from the transmission mechanism or the mounting plane of the device equipped with the transmission mechanism along the third direction, and the direction of "down" refers to the direction close to the transmission mechanism or the mounting plane of the device equipped with the transmission mechanism.

[0029] Example:

[0030] Firstly, this application provides a transmission mechanism, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, it includes a first synchronous belt assembly 11 and a second synchronous belt assembly 12. The first synchronous belt assembly 11 and the second synchronous belt assembly 12 are configured to jointly drive the printing mechanism 2 to move along a plane enclosed by a first direction x and a second direction y, wherein the first direction x and the second direction y are perpendicular to each other. The first synchronous belt assembly 11 includes a first drive member 111, a second drive member 112 and a first synchronous belt 113. The first drive member 111 and the second drive member 112 are configured to jointly drive the first synchronous belt 113 to move. The second synchronous belt assembly 12 includes a third drive member 121, a fourth drive member 122 and a second synchronous belt 123. The third drive member 121 and the fourth drive member 122 are configured to jointly drive the second synchronous belt 123 to move. The first synchronous belt 113 and the second synchronous belt 123 are distributed at intervals along a third direction z, and the opposite ends of the first synchronous belt 113 are respectively connected to the printing mechanism 2, and the opposite ends of the second synchronous belt 123 are respectively connected to the printing mechanism 2.

[0031] In use, the first driving member 111 and the second driving member 112 jointly drive the first synchronous belt 113 to rotate, and the third driving member 121 and the fourth driving member 122 jointly drive the second synchronous belt 123 to rotate. The printing mechanism 2 moves along the plane enclosed by the first synchronous belt assembly 11 and the second synchronous belt assembly 12 under the joint drive of the first synchronous belt assembly 11 and the second synchronous belt assembly 12. In the transmission mechanism described in this application, the structure of multiple driving members jointly driving the synchronous belt provides a large driving force for the transmission of the synchronous belt, overcoming the defects of excessive synchronous belt extension length, insufficient driving torque, and poor transmission effect in large-size 3D printers.

[0032] In practical use, the driving configuration of the first synchronous belt component 11 and the second synchronous belt component 12 can be specifically set according to actual needs. For example, the first synchronous belt component 11 and the second synchronous belt component 12 jointly drive the printing mechanism 2 to move along the first direction x or the second direction y. In this case, the first synchronous belt component 11 and the second synchronous belt component 12 act on the printing mechanism 2 simultaneously, further enhancing the driving force. In a second embodiment, the first synchronous belt component 11 is used to drive the printing mechanism 2 to move along the first direction x, and the second synchronous belt component 12 is used to drive the printing mechanism 2 to move along the second direction y. In a third embodiment, the first synchronous belt component 11 is used to drive the printing mechanism 2 to move along the second direction y, and the second synchronous belt component 12 is used to drive the printing mechanism 2 to move along the first direction x. In the second and third embodiments, the first synchronous belt component 11 and the second synchronous belt component 11 respectively control the printing mechanism 2 to move independently along the first direction x or the second direction y, simplifying the setup difficulty of the operating system and reducing the operational difficulty.

[0033] Optionally, the transmission mechanism further includes a first guide rail 101, a second guide rail 102, and a third guide rail 103. The first guide rail 101 extends along the first direction x, and the second guide rail 102 and the third guide rail 103 are spaced apart along the second direction y. A first slider 14 is disposed between the first guide rail 101 and the third guide rail 103, and a second slider 15 is disposed between the first guide rail 101 and the second guide rail 102. A first synchronous belt 113 is wound around the first slider 14 and the second slider 15, and a second synchronous belt 123 is wound around the first slider 14 and the second slider 15. The first guide rail 101 is configured to mount the printing mechanism 2. In use, the first slider 14 and the second slider 15 move along the second direction y under the drive of the first synchronous belt 113 and / or the second synchronous belt 123, thereby driving the printing mechanism 2 disposed between the first slider 14 and the second slider 15 to move along the second direction y; the first synchronous belt 113 and / or the second synchronous belt 123 drive the printing mechanism 2 to move along the first direction x.

[0034] The first guide rail 101 guides the movement of the printing mechanism 2 along the first direction x, improving the stability of its movement. The second guide rail 102 and the third guide rail 103 guide the movement of the first slider 14 and the second slider 15 along the second direction y, further improving their stability. The stable arrangement of the first guide rail 101, the second guide rail 102, and the third guide rail 103 enhances the stability of the movement of the printing mechanism 2, the first slider 14, and the second slider 15, further ensuring the stability of the printing mechanism 2 in large-size 3D printers, avoiding swaying caused by the length setting process of the transmission belt, and further ensuring print quality.

[0035] Optionally, the transmission mechanism further includes a bracket 13 that encloses a rectangular area. The first synchronous belt assembly 11 and the second synchronous belt assembly 12 are configured to jointly drive the printing mechanism 2 to move within the rectangular area. The second guide rail 102 and the third guide rail 103 form two opposite sides of the rectangular area. The bracket 13 includes a first bracket 131 and a second bracket 132 located at one set of diagonal points of the rectangular area, and a third bracket 133 and a fourth bracket 134 located at another set of diagonal points of the rectangular area. The first bracket 131... The fourth support 134 is located at opposite ends of the second guide rail 102, the second support 132 and the third support 133 are located at opposite ends of the third guide rail 103, the first support 131 and the third support 133 are arranged adjacent to each other, the first synchronous belt 113 passes through the first support 131, the second support 132, the third support 133 and the fourth support 134, and the second synchronous belt 123 passes through the first support 131, the second support 132, the third support 133 and the fourth support 134.

[0036] In some embodiments, the first driving member 111 is disposed on the first bracket 131, the second driving member 112 is disposed on the second bracket 132, the third driving member 121 is disposed on the third bracket 133, and the fourth driving member 122 is disposed on the fourth bracket 134; the first slider 14 is disposed between the second driving member 112 and the third driving member 121, and the second slider 15 is disposed between the first driving member 111 and the fourth driving member 122; the first bracket 131, the second bracket 132, the third bracket 133, and the fourth bracket 134 are all provided with synchronous pulleys 16, and the synchronous pulleys 16 are configured to... The first synchronous belt 113 or the second synchronous belt 123 are connected for transmission, so that the first synchronous belt 113 and the second synchronous belt 123 extend along the outer periphery of the rectangular area; thereby, the winding paths of the first synchronous belt 113 and the second synchronous belt 123 both extend along the outer periphery of the rectangular area formed between the supports 13. While ensuring that the printing mechanism 2 is driven to move along the planar area enclosed by the first direction x and the second direction y, the regularity of the setting of the first synchronous belt 113 and the second synchronous belt 123 is improved, and the setting of the first synchronous belt 113 and the second synchronous belt 123 is avoided from interfering with the setting of other mechanisms.

[0037] See Figure 3 As shown, the structure of the bracket equipped with the synchronous pulley 16 is illustrated using the third bracket 133 as an example. Figure 4 The structure of a bracket without the timing pulley 16 is illustrated using the fourth bracket 134 as an example. Whether or not the timing pulley 16 is provided on the bracket can be specifically set according to the winding path of the first timing belt 113 and the second timing belt 123, so as to ensure the normal transmission of the first timing belt 113 and the second timing belt 123.

[0038] For example, in some embodiments, when the first bracket 131 and the third bracket 133, which are arranged along the first direction x, are respectively provided with synchronous pulleys 16, the synchronous pulley 16 on the first bracket 131 is used for transmission connection with the second synchronous belt 123, and the synchronous pulley 16 on the third bracket 133 is used for transmission connection with the first synchronous belt 113. That is, when the first bracket 131 and the third bracket 133, which are arranged along the second direction y, are respectively provided with synchronous pulleys 16, the two ends of the first synchronous belt 113 are respectively connected to the two sides of the printing mechanism 2, and are wound around the first drive member 111, the second slider 15, the first slider 14, the second drive member 112 and the synchronous pulley 16 provided on the third bracket 133, and the two ends of the second synchronous belt 123 are respectively connected to the two sides of the printing mechanism 2, and are wound around the third drive member 121, the first slider 14, the second slider 15, the fourth drive member 122 and the synchronous pulley 16 provided on the first bracket 131.

[0039] In other embodiments, when the first bracket 131 and the third bracket 133 are respectively provided with synchronous pulleys 16, the synchronous pulley 16 on the first bracket 131 is used for transmission connection with the second synchronous belt 123, and the synchronous pulley 16 on the third bracket 133 is used for transmission connection with the first synchronous belt 113. That is, when the second bracket 132 and the fourth bracket 134 arranged along the second direction y are provided with the synchronous pulleys 16, the two ends of the first synchronous belt 113 are respectively connected to the two sides of the printing mechanism 2 and are wound around the synchronous pulleys 16 on the first drive member 111, the second slider 15, the first slider 14, the second drive member 112 and the third bracket 133, and the two ends of the second synchronous belt 123 are respectively connected to the printing mechanism 2 and are wound around the third drive member 121, the first slider 14, the second slider 15, the fourth drive member 122 and the synchronous pulley 16 on the second bracket 132.

[0040] Optionally, the first slider 14 is provided with a first synchronous pulley 17, which is connected to the first synchronous belt 113; the second slider 15 is provided with a second synchronous pulley 18, which is connected to the second synchronous belt 123. Figure 5The example shown uses the first slider 14. The first synchronous pulley 17 and the second synchronous pulley 18 guide the first synchronous belt 113 and the second synchronous belt 123, respectively, so that the first synchronous belt 113 and the second synchronous belt 123 extend along the first direction x in the section between the first slider 14 and the second slider 15. The first synchronous pulley 17 is positioned above the second synchronous pulley 18 along the third direction z; this ensures that the first synchronous belt 113 and the second synchronous belt 123 are distributed along the third direction z. The rotating ends of the first driving member 111 and the second driving member 112 are respectively provided with first drive pulleys 114, which are connected to the first synchronous belt 113. The rotating ends of the third driving member 121 and the fourth driving member 122 are respectively provided with second drive pulleys 124, which are connected to the second synchronous belt 123.

[0041] In some embodiments, the first slider 14 is provided with a first rotating shaft 141, and the second slider 15 is provided with a second rotating shaft 151; the first synchronous pulley 17 is located on the upper part of the first rotating shaft 141, and the second synchronous pulley 18 is rotatably connected to the lower part of the second rotating shaft 151. In use, the first synchronous belt 113 is wound around the first synchronous pulley 17, and the second synchronous belt 123 is wound around the second synchronous pulley 18, ensuring that the first synchronous belt 113 and the second synchronous belt 123 are distributed vertically along the third direction z. This guides the connection between the first synchronous belt 113 and the second synchronous belt 123 and the printing mechanism 2, ensuring stable driving of the 3D printing head 21 during subsequent use and guaranteeing the printing quality of the 3D printer.

[0042] See Figure 2 and Figure 4As shown, the transmission mechanism further includes a first tensioning assembly 115 and a second tensioning assembly 125. The first tensioning assembly 115 includes a first idler wheel 1151 and a first limiting member 1152. The first synchronous belt 113 is sleeved on the first idler wheel 1151. The first limiting member 1152 is used to adjust the position of the first idler wheel 1151 and to limit and fix the first idler wheel 1151. The first idler wheel 1151 and the first limiting member 1152 are used together to tension the first synchronous belt 113. The second tensioning assembly 125 includes a second idler wheel 1251 and a second limiting member 1252. The second synchronous belt 123 is sleeved on the second idler wheel 1251. The second limiting member 1252 is used to adjust the position of the second idler wheel 1251 and to limit and fix the second idler wheel 1251. The second idler wheel 1251 and the second limiting member 1252 are used together to tension the second synchronous belt 123.

[0043] Specifically, the first idler pulley 1151 can move in a direction deviating from the extension direction of the first synchronous belt 113, and the first limiting member 1152 can limit and fix the new position of the first idler pulley 1151 after movement, thereby achieving tensioning of the first synchronous belt 113. The second idler pulley 1251 can move in a direction deviating from the extension direction of the second synchronous belt 123, and the second limiting member 1252 can limit and fix the new position of the second idler pulley 1251 after movement, thereby achieving tensioning of the second synchronous belt 123.

[0044] Secondly, a 3D printer is provided, see [link to relevant documentation] Figure 6 As shown, it includes a frame 3, a printing mechanism 2, and a transmission mechanism 1 as described above. The transmission mechanism 1 is supported on the frame 3 and is used to drive the printing mechanism 2 to move in the planar region enclosed by the first direction x and the second direction y.

[0045] The printing mechanism 2 includes a print head 21 with a print nozzle 211. The print head 21 is slidably connected to a first guide rail 101. A first synchronous belt 113 and a second synchronous belt 123 are respectively connected to opposite sides of the print head 21. When the first guide rail 101 is provided, the first guide rail 101 passes through the print head 21.

[0046] The first guide rail 101 guides the movement of the printing mechanism 2 along the first direction x, improving the stability of its movement. The second guide rail 102 and the third guide rail 103 guide the movement of the first slider 14 and the second slider 15 along the second direction y, further improving their stability. The stable arrangement of the first guide rail 101, the second guide rail 102, and the third guide rail 103 enhances the stability of the movement of the printing mechanism 2, the first slider 14, and the second slider 15, further ensuring the stability of the printing mechanism 2 in large-size 3D printers, avoiding swaying caused by the length setting process of the transmission belt, and further ensuring print quality.

[0047] The printing mechanism 2 further includes a heat sink 22 disposed on the print head 21, the heat sink 22 being located close to the print nozzle 211. In some embodiments, the heat sink 22 is a cooling fan.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above embodiments merely illustrate preferred implementations of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A transmission mechanism, characterized in that: It includes a first synchronous belt assembly and a second synchronous belt assembly, which are configured to jointly drive a printing mechanism to move along a plane enclosed by a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other; the first synchronous belt assembly includes a first driving member, a second driving member, and a first synchronous belt, which are configured to jointly drive the first synchronous belt to move; the second synchronous belt assembly includes a third driving member, a fourth driving member, and a second synchronous belt, which are configured to jointly drive the second synchronous belt to move; the first synchronous belt and the second synchronous belt are spaced apart along a third direction, and the opposite ends of the first synchronous belt are respectively connected to the printing mechanism, and the opposite ends of the second synchronous belt are respectively connected to the printing mechanism.

2. The transmission mechanism according to claim 1, characterized in that: The transmission mechanism further includes a first guide rail, a second guide rail, and a third guide rail. The first guide rail extends along the first direction, and the second and third guide rails are spaced apart along the second direction. A first slider is provided between the first and third guide rails, and a second slider is provided between the first and second guide rails. A first synchronous belt is wound around the first and second sliders, and a second synchronous belt is wound around the first and second sliders. The first guide rail is configured to mount the printing mechanism.

3. The transmission mechanism according to claim 2, characterized in that: The transmission mechanism further includes a bracket that encloses a rectangular area. The first and second synchronous belt assemblies are configured to jointly drive the printing mechanism to move within the rectangular area. The second and third guide rails form two opposite sides of the rectangular area. The bracket includes a first and a second bracket located at one set of diagonal points of the rectangular area, and a third and a fourth bracket located at another set of diagonal points of the rectangular area. The first and fourth brackets are located at opposite ends of the second guide rail, and the second and third brackets are located at opposite ends of the third guide rail. The first and third brackets are arranged adjacent to each other. The first synchronous belt passes through the first, second, third, and fourth brackets, and the second synchronous belt passes through the first, second, third, and fourth brackets.

4. The transmission mechanism according to claim 3, characterized in that: The first driving member is disposed on the first bracket, the second driving member is disposed on the second bracket, the third driving member is disposed on the third bracket, and the fourth driving member is disposed on the fourth bracket; the first slider is disposed between the second driving member and the third driving member, and the second slider is disposed between the first driving member and the fourth driving member; the first bracket, the second bracket, the third bracket, and the fourth bracket are all provided with synchronous pulleys, and the synchronous pulleys are configured to be connected to the first synchronous belt or the second synchronous belt for transmission, so that the first synchronous belt and the second synchronous belt extend along the outer periphery of the rectangular area.

5. The transmission mechanism according to claim 4, characterized in that: When the first bracket and the third bracket are respectively provided with synchronous pulleys, the synchronous pulley on the first bracket is used to drive the second synchronous belt, and the synchronous pulley on the third bracket is used to drive the first synchronous belt.

6. The transmission mechanism according to claim 2, characterized in that: The first slider is provided with a first synchronous pulley, which is connected to the first synchronous belt. The second slider is provided with a second synchronous pulley, which is connected to the second synchronous belt. The first synchronous pulley is located above the second synchronous pulley along a third direction. The rotating ends of the first driving member and the second driving member are respectively provided with first drive pulleys, which are connected to the first synchronous belt. The rotating ends of the third driving member and the fourth driving member are respectively provided with second drive pulleys, which are connected to the second synchronous belt.

7. The transmission mechanism according to claim 6, characterized in that: The first slider is provided with a first rotating shaft, and the second slider is provided with a second rotating shaft; the first synchronous pulley is located on the upper part of the first rotating shaft, and the second synchronous pulley is rotatably connected to the lower part of the second rotating shaft.

8. The transmission mechanism according to claim 1, characterized in that: The transmission mechanism further includes a first tensioning component and a second tensioning component. The first tensioning component includes a first idler pulley and a first limiting member. The first synchronous belt is sleeved on the first idler pulley. The first limiting member is used to adjust the position of the first idler pulley and to limit and fix the first idler pulley. The first idler pulley and the first limiting member together are used to tension the first synchronous belt. The second tensioning component includes a second idler pulley and a second limiting member. The second synchronous belt is sleeved on the second idler pulley. The second limiting member is used to adjust the position of the second idler pulley and to limit and fix the second idler pulley. The second idler pulley and the second limiting member together are used to tension the second synchronous belt.

9. A 3D printer, characterized in that: It includes a frame, a printing mechanism, and a transmission mechanism as described in any one of claims 1-8, the transmission mechanism being supported on the frame and used to drive the printing mechanism to move in a planar region enclosed by the first direction and the second direction.

10. The 3D printer according to claim 9, characterized in that: The printing mechanism includes a print head equipped with a print nozzle, the print head being slidably connected to a first guide rail, and a first synchronous belt and a second synchronous belt being respectively connected to opposite sides of the print head.

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