Transmission switching device, feeding equipment, material returning equipment and 3D printer

Abstract

The utility model provides a transmission switching device, feeding equipment, material returning equipment and a 3D printer, and the transmission switching device comprises a switching assembly which comprises a switching piece and a switching gear arranged on the switching piece; the driving assembly comprises a driving part and an output shaft arranged on the driving part, the output shaft is in transmission connection with the switching part, and the driving assembly is configured to selectively arrange the switching gear at the first position or the second position; the driving force of the driving part is transmitted to equipment which is directly or indirectly meshed with the switching gear; a first gear assembly is further included, the first gear assembly comprises at least one first gear, and the first gear is in meshed connection with a switching gear arranged at the first position or the second position so as to transmit the driving force of the driving part to equipment meshed with the first gear. The switching gear is switched between the first position and the second position, the feeding and discharging requirements of the consumables are met, and the feeding and discharging reliability of the consumables is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of 3D printing, and specifically relates to a transmission switching device, a feeding device, a material discharging device, and a 3D printer. Background Art

[0002] FDM (Fused Deposition Modeling) is one of the most widely used 3D printing technologies at present. 3D printers using FDM technology use linear consumables, melt them, and deposit them on the working platform to form a shape. This type of 3D printer has a relatively simple structure, low manufacturing, usage, and maintenance costs, and low material costs. Therefore, this type of 3D printer has the widest application fields and the fastest promotion speed.

[0003] Generally, the consumables used in existing 3D printing equipment are wound around a drum-shaped feeding tray. A certain pulling force is applied to the consumables through an extrusion mechanism, so that the feeding tray rotates under the action of the pulling force to convey the consumables to the extrusion mechanism for extrusion and application. Or, through a material discharging mechanism, the feeding tray is controlled to rotate in the opposite direction to wind the excess consumables back onto the feeding tray to achieve material discharging. However, both the extrusion mechanism and the material discharging mechanism need to be controlled by separate drive motors, and it is impossible to switch between the extrusion mechanism and the material discharging mechanism through the same drive mechanism, resulting in less than ideal usage effects. Therefore, how to switch the feeding state and the material discharging state of the consumables and improve the reliability of the feeding and discharging of the consumables is an urgent problem to be solved. Summary of the Utility Model

[0004] This application provides a transmission switching device, a feeding device, a material discharging device, and a 3D printer to meet the need for switching the feeding state and the material discharging state of the consumables and improve the reliability of the feeding and discharging of the consumables.

[0005] To solve the above technical problems, this application provides a transmission switching device for the feeding and discharging of consumables on a material tray. The transmission switching device includes:

[0006] A switching assembly, including a switching member and a switching gear provided on the switching member;

[0007] A driving assembly, including a driving member and an output shaft provided on the driving member, and the output shaft is in transmission connection with the switching member;

[0008] Wherein, the driving assembly is configured to selectively arrange the switching gear in a first position or a second position to transmit the driving force of the driving member to a device that is directly or indirectly engaged with the switching gear.

[0009] As a further improvement of the present application, the transmission switching device further includes a first gear assembly, the first gear assembly includes at least one first gear, and the first gear is meshed and connected with the switching gear arranged at the first position or the second position to transmit the driving force of the driving member to the device meshed with the first gear;

[0010] Wherein, when the number of the first gears is 2n - 1, the rotation direction of the switching gear is opposite to that of the material tray; when the number of the first gears is 2n, the rotation direction of the switching gear is the same as that of the material tray.

[0011] As a further improvement of the present application, the driving assembly further includes a driving worm arranged on the output shaft and a driving worm wheel in transmission connection with the switching member, and the driving worm is meshed and connected with the driving worm wheel; or,

[0012] The driving assembly further includes an output gear arranged on the output shaft and a transmission gear in transmission connection with the switching member, and the output gear and the transmission gear are in transmission connection through a synchronous belt; and / or,

[0013] The driving assembly further includes a reduction mechanism arranged on the output shaft, and the reduction mechanism is in transmission connection with the switching member.

[0014] As a further improvement of the present application, a driving gear meshed and connected with the switching gear is further arranged on the switching member, and the driving gear is in transmission connection with the output shaft of the driving assembly;

[0015] The driving assembly is configured to drive the switching member to rotate clockwise or counterclockwise so that the switching gear is selectively arranged at the first position or the second position.

[0016] As a further improvement of the present application, the driving gear and the driving assembly are in transmission connection through a first transmission rod to drive the driving gear and the switching member to rotate when the driving member rotates.

[0017] As a further improvement of the present application, knurling is provided at the positions where the first transmission rod is connected to the driving gear and the driving assembly;

[0018] and / or, a limiting surface is provided at the positions where the first transmission rod is connected to the driving gear and the driving assembly, and abutting surfaces adapted to the limiting surface are provided at the positions of the shaft holes of the driving gear and the driving assembly corresponding to the limiting surface;

[0019] And / or, a protruding portion is provided at the position where the first transmission rod is connected to the driving gear and the driving assembly, and a groove portion adapted to the protruding portion is provided at the position of the shaft holes of the driving gear and the driving assembly corresponding to the protruding portion.

[0020] As a further improvement of the present application, the switching member includes two oppositely arranged limiting walls, and through holes for the first transmission rod to pass through are provided on the two limiting walls;

[0021] The driving gear and the switching gear are arranged between the two limiting walls.

[0022] As a further improvement of the present application, a swinging gear meshed with the driving gear is further provided on the switching member, and the swinging gear and the switching gear are oppositely arranged at both ends of the switching member;

[0023] The switching member is provided with a switching rotating shaft for the switching gear to rotate at the position corresponding to the switching gear, and a swinging rotating shaft for the swinging gear to rotate at the position corresponding to the swinging gear.

[0024] Based on the above transmission switching device, the present application further provides a material discharging device, which includes the transmission switching device described in any one of the above; and,

[0025] A material discharging assembly, the material discharging assembly includes a material discharging roller and a material discharging gear connected to the material discharging roller, and the material discharging gear is configured to be directly or indirectly meshed with the switching gear, and drives the material discharging gear to rotate counterclockwise through the switching gear, so as to drive the tray on the material discharging roller to rotate clockwise to achieve material discharging.

[0026] As a further improvement of the present application, when the switching gear is arranged at the first position, the first gear assembly is respectively connected to the switching gear and the material discharging gear;

[0027] Wherein, when the number of the first gears is odd, the switching gear rotates counterclockwise to drive the material discharging gear to rotate counterclockwise; when the number of the first gears is even, the switching gear rotates clockwise to drive the material discharging gear to rotate counterclockwise, and the material discharging is achieved by driving the tray to rotate clockwise through the counterclockwise rotation of the material discharging gear.

[0028] Based on the above transmission switching device, the present application further provides a material feeding device, which includes the transmission switching device described in any one of the above; and,

[0029] A feed assembly, wherein the feed assembly includes a feed gear set and a feed gear, wherein the feed gear is connected to the feed gear set, and the feed gear is configured to directly or indirectly mesh with the switching gear, and the switching gear drives the feed gear to rotate clockwise to drive the feed gear set to rotate clockwise to extrude the consumables to achieve feeding.

[0030] As a further improvement of the present application, when the switching gear is arranged in the second position, the first gear assembly is connected to the switching gear and the feeding gear respectively;

[0031] Among them, when the number of the first gears is an odd number, the switching gear rotates clockwise to drive the feed gear to rotate clockwise; when the number of the first gears is an even number, the switching gear rotates counterclockwise to drive the feed gear to rotate clockwise, and the feeding is achieved by the clockwise rotation of the feed gear to drive the material tray to rotate counterclockwise.

[0032] Based on the above-mentioned transmission switching device, feeding equipment and material return equipment, the present application also provides a 3D printer, which includes the transmission switching device described in any one of the above items, or includes the feeding equipment described in any one of the above items, or includes the material return equipment described in any one of the above items.

[0033] Compared with the prior art, the transmission switching device, feeding equipment, material return equipment and 3D printer provided in the embodiments of the present application are used for feeding and returning consumables wound on a material tray. The switching gear is arranged in the first position or the second position through the driving component to transmit the driving force of the driving member to the device directly or indirectly meshed with the switching gear to realize the feeding or returning of the consumables. The present application controls the output shaft and the switching member connected to the output shaft to rotate through the driving member, so that the switching gear arranged on the switching member is directly or indirectly meshed with the corresponding feeding device or material return device, thereby transmitting the driving force of the driving member to the device directly or indirectly meshed with the switching gear. The present application satisfies the demand for switching between the feeding state and the withdrawing state of the consumables by switching the switching gear between the first position and the second position, thereby improving the feeding and withdrawing reliability of the consumables and ensuring the 3D printing efficiency and printing quality; a first gear meshingly connected to the feeding device or the withdrawing device is arranged at the first position and / or the second position, and the number of the first gears and the rotation direction of the switching gear are adjusted to meet the clockwise or counterclockwise rotation demand of the material tray to achieve a higher torque, and the present application does not need to separately set a driving part for the feeding device or the withdrawing device, thereby reducing the occupied space and effectively reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Structural schematic diagram of the transmission switching device provided by the embodiment of the present application;

[0036] Figure 2 For Figure 1 Structural schematic diagram of the driving gear in the shown transmission switching device;

[0037] Figure 3 For Figure 1 Structural schematic diagram of the switching gear in the shown transmission switching device;

[0038] Figure 4 For Figure 1 Structural schematic diagram of the knurling in the shown transmission switching device;

[0039] Figure 5 For Figure 1 Structural schematic diagram of the limiting surface in the shown transmission switching device;

[0040] Figure 6 For Figure 1 Stereo assembly drawing of the switching member in the shown transmission switching device;

[0041] Figure 7 For Figure 1 Structural schematic diagram of the first gear in the shown transmission switching device;

[0042] Figure 8 Structural schematic diagram of the 3D printer provided by the embodiment of the present application;

[0043] Figure 9 For Figure 8 Structural schematic diagram of the frame in the shown 3D printer;

[0044] Figure 10 For Figure 8 Structural schematic diagram of the material outlet in the shown 3D printer;

[0045] Figure 11 For Figure 8 Structural schematic diagram of the housing in the shown 3D printer;

[0046] Explanation of reference numerals:

[0047] 10 - Driving assembly; 11 - Driving member; 12 - Driving worm gear; 13 - Driving worm;

[0048] 20 - switching component; 21 - switching part; 211 - limiting wall; 212 - clamping part; 213 - switching rotating shaft; 214 - swinging rotating shaft; 215 - fastening structure; 216 - first limiting groove; 22 - switching gear; 23 - driving gear; 24 - first transmission rod; 241 - knurling; 242 - limiting surface; 243 - abutting surface; 25 - swinging gear

[0049] 30 - material discharging component; 31 - material discharging gear; 32 - material discharging roller; 321 - silica gel sleeve; 33 - first transmission gear

[0050] 40 - material feeding component; 41 - material feeding gear; 42 - feeding gear set

[0051] 50 - frame; 51 - housing; 52 - discharging port; 53 - sealing port

[0052] 60 - consumable Detailed implementation manners

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0055] In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the implementation manners and specific embodiments of the present application; however, this is not the only form for implementing or applying the specific embodiments of the present application. The implementation manners cover the features of multiple specific embodiments and the method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0056] Please refer to Figures 1 - 11 , to meet the need to switch the feeding state and discharging state of the consumable, and to improve the reliability of the feeding and discharging of the consumable and the 3D printing efficiency, the embodiments of the present application provide a transmission switching device, a feeding device, a discharging device and a 3D printer for feeding and discharging the consumable wound on a material tray (not shown in the figure).

[0057] Please refer to Figure 1 , which is a schematic structural diagram of the transmission switching device provided by the embodiment of the present application. The transmission switching device includes a driving component 10 and a switching component 20. Among them, the driving component 10 includes a driving member 11 and an output shaft 111 arranged on the driving member 11. The switching component 20 includes a switching member 21 and a switching gear 22 arranged on the switching member 21. In the present application, the output shaft 111 on the driving member 11 is in transmission connection with the driving member 11. By driving the driving member 11, the switching member 21 is driven to rotate clockwise or counterclockwise, so that the switching gear 22 on the switching member 21 is arranged at a first position or a second position, and the driving force of the driving member 11 is transmitted to the device that is directly or indirectly engaged with the switching gear 22.

[0058] Please refer to Figure 2 , for Figure 1 shown is a schematic structural diagram of the driving gear 23 in the transmission switching device. It can be observed that the switching component 20 includes a switching member 21 and a switching gear 22 arranged on the switching member 21. Since the switching gear 22 is arranged on the switching member 21, the switching gear 22 will be driven to rotate synchronously during the rotation of the switching member 21.

[0059] In the embodiment of the present application, through the driving component 10, the switching gear 22 arranged on the switching member 21 can be switched between a first position and a second position, so that the switching gear 22 is directly or indirectly engaged and connected with the device arranged at the corresponding position, thereby transmitting the driving force of the driving member 11 to the device that is directly or indirectly engaged with the switching gear 22.

[0060] Please refer to Figure 8 , which is a schematic structural diagram of the 3D printer provided by the embodiment of the present application. The device that is directly or indirectly engaged with the switching gear 22 described above can be a material discharging device or a material feeding device. When the switching gear 22 is directly or indirectly connected to the material discharging device, the driving force of the driving member 11 can be transmitted to the material discharging device to realize the discharging of the printing consumables. When the switching gear 22 is directly or indirectly connected to the material feeding device, the driving force of the driving member 11 can be transmitted to the material feeding device to realize the feeding of the printing consumables.

[0061] As an optional implementation manner, when the switching gear 22 is arranged at a first position or a second position, a first gear assembly may be further arranged between the switching gear 22 and the material discharging gear 31. The first gear assembly includes at least one first gear 33, and the first gear 33 is connected to the switching gear 33 arranged at a first position or a second position, so as to transmit the driving force of the driving member 11 to the device that is engaged with the first gear 33.

[0062] In an alternative embodiment, the device meshed with the first gear 33 is a material discharging device. When the switching gear 22 is arranged at the first position, it will be meshed with the first gear 33 at the corresponding position, and transmit the driving force of the driving member 11 to the material discharging device meshed with the first gear 33.

[0063] In an alternative embodiment, the device meshed with the first gear 33 is a material feeding device. When the switching gear 22 is arranged at the second position, it will be meshed with the first gear 33 at the corresponding position, and transmit the driving force of the driving member 11 to the material feeding device meshed with the first gear 33.

[0064] In the first alternative embodiment, both the material discharging device and the material feeding device are meshed with corresponding first gears 33. When the switching gear 22 is arranged at the first position, it will be meshed with the first gear 33 corresponding to the first position, and transmit the driving force of the driving member 11 to the material discharging device meshed with the first gear 33. When the switching gear 22 is arranged at the second position, it will be meshed with the first gear 33 corresponding to the second position, and transmit the driving force of the driving member 11 to the material feeding device meshed with the first gear 33.

[0065] Of course, the setting methods provided in the above embodiments are all feasible, and the present application does not further limit the specific setting position and the number of the above first gears 33.

[0066] In the embodiment of the present application, when the number of the first gears 33 is configured as 2n - 1, the rotation direction of the switching gear 22 is opposite to that of the material tray. When the number of the first gears 33 is configured as 2n, the rotation direction of the switching gear 22 is the same as that of the material tray, where n is a positive integer.

[0067] It can also be understood that when the number of the first gears 33 is odd, the rotation direction of the switching gear 22 is opposite to that of the material tray. When the number of the first gears 33 is even, the rotation direction of the switching gear 22 is the same as that of the material tray; wherein, the rotation direction of the switching gear 22 and the material tray includes clockwise rotation or counterclockwise rotation.

[0068] It should be noted that the above-mentioned opposite rotation direction of the switching gear 22 and the material tray can be understood as that when the switching gear 22 rotates clockwise, the material tray rotates counterclockwise, and when the switching gear 22 rotates counterclockwise, the material tray rotates clockwise; the above-mentioned same rotation direction of the switching gear 22 and the material tray can be understood as that when the switching gear 22 rotates clockwise, the material tray rotates clockwise, and when the switching gear 22 rotates counterclockwise, the material tray rotates counterclockwise.

[0069] In an embodiment of the present application, when it is necessary to unload the consumables wound on the material tray, it is necessary to ensure that the material tray rotates clockwise. At this time, when the number of the first gears 33 is an odd number, it is necessary to set the switching gear 22 to rotate counterclockwise to drive the material tray to rotate clockwise. When the number of the first gears 33 is an even number, it is necessary to set the switching gear 22 to rotate clockwise to drive the material tray to rotate clockwise.

[0070] Similarly, when it is necessary to feed the consumables wound on the material tray, it is necessary to ensure that the material tray rotates counterclockwise. At this time, when the number of the first gears 33 is an odd number, it is necessary to set the switching gear 22 to rotate clockwise to drive the material tray to rotate counterclockwise. When the number of the first gears 33 is an even number, it is necessary to set the switching gear 22 to rotate counterclockwise to drive the material tray to rotate counterclockwise.

[0071] In principle, regardless of whether an odd number or an even number is set or whether the first gear 33 is not set, it is necessary to switch the gear 22 while rotating to drive the material tray to rotate counterclockwise to achieve material return, or to drive the material tray to rotate clockwise to achieve material feeding. Therefore, this application does not impose further restrictions on the specific setting number of the above-mentioned first gear 33.

[0072] The present application provides a first gear 33 meshingly connected to a feeding device or a returning device at the first position and / or the second position. By adjusting the number of the first gears 33 and the rotation direction of the switching gear 22, the clockwise or counterclockwise rotation requirement of the material tray can be met, thereby achieving a higher torque than a traditional direct drive motor.

[0073] As an optional embodiment, the above-mentioned driving assembly 10 may include a driving worm 13 arranged on the driving shaft, and a driving worm wheel 12 which is transmission-connected to the switching member 21. It can be observed that a thread groove is provided at one end of the driving worm 13 close to the driving worm wheel 12, and the thread groove is meshingly connected with the outer tooth profile of the driving worm wheel 12, so that the driving member 11 drives the driving shaft 111 and the driving worm 13 on the driving shaft 111 to rotate, and then the driving worm 13 drives the driving worm wheel 12 to rotate. Since the switching member 21 is transmission-connected to the driving worm wheel 12, the driving worm wheel 12 will drive the switching member 21 to rotate while rotating, so that the switching gear 22 is arranged in the first position or the second position according to demand, so as to mesh with the material return device or the feeding device arranged at the corresponding position to realize the material return or feeding of the consumables.

[0074] The above-mentioned method of cooperating through the driving worm 13 and the driving worm wheel 12 can provide a very high reduction ratio, which is suitable for application scenarios requiring a large torque, such as application scenarios suitable for consumer-grade 3D printers. The transmission structure of the worm gear is compact and occupies a small space. Therefore, it is suitable for application scenarios with limited space such as the inside of a material box. The transmission structure of the worm gear usually has a self-locking feature, so it can achieve self-locking when there is no power drive, thereby preventing the consumables 60 wrapped around the material tray from being squeezed out or pulled out.

[0075] Optionally, the above-mentioned drive assembly 10 may also include an output gear (not shown in the figure) arranged on the output shaft 111, and a reduction gear (not shown in the figure) transmission-connected to the switching member 21. The number of the reduction gears is set to at least one. When only one reduction gear is provided, the reduction gear is transmission-connected to the switching member 21, and should be meshed with the output gear. When the driving member 11 drives the driving shaft 111 and the output gear arranged on the driving shaft 111 to rotate, the reduction gear and the switching member are driven to rotate; when the number of reduction gears is set to several, the output gear should be meshed with the adjacent reduction gear, and the switching member 21 should also be meshed with the adjacent reduction gear. Several reduction gears satisfy the meshing connection relationship, so that when the driving member 11 drives the driving shaft 111 and the output gear arranged on the driving shaft 111 to rotate, it drives several reduction gears to rotate, so that the switching gear 22 on the switching member 21 is arranged at the first position or the second position according to needs.

[0076] It can be understood that the above-mentioned method of cooperating through the output gear and the reduction gear can reduce the rotational speed of the driving member 11 and increase the output torque, and can achieve higher torque compared to the setting method of the traditional direct drive motor. Therefore, this application does not further limit the specific number of the above-mentioned reduction gears.

[0077] As an optional embodiment, the above-mentioned driving component 10 may further include an output gear arranged on the output shaft 111, and a transmission gear (not shown in the figure) connected to the switching member 21. The output gear and the transmission gear may be connected by a belt or a synchronous belt, so that when the driving member 11 drives the driving shaft 111 and the output gear arranged on the driving shaft 111 to rotate, the belt or the synchronous belt drives the transmission gear and the switching member 21 to rotate synchronously, so that the switching gear 22 on the switching member 21 is arranged at the first position or the second position according to needs, thereby effectively reducing the cost.

[0078] Alternatively, the above-mentioned drive assembly 10 may also include a reduction mechanism arranged on the output shaft 111, and the reduction mechanism may be arranged in the form of a gear reducer, a worm reducer or a planetary gear reducer, which is connected to the switching member in a transmission manner, and can also drive the switching member 21 to rotate when the driving member 11 drives the driving shaft 111 and the reduction mechanism to rotate, so that the switching gear 22 on the switching member 21 is arranged at the first position or the second position according to requirements. High-precision position control can be provided by means of the reduction mechanism and the driving member 11, which is suitable for application scenarios requiring high dynamic response and precise control, such as application scenarios of industrial-grade 3D printers.

[0079] It should be noted that the above-mentioned driving worm wheel 12 and driving worm 13, the output gear and the reduction gear, the output gear and the transmission gear are connected by belt or synchronous belt transmission, as well as by a reduction mechanism transmission connection. The specific setting form of the above-mentioned driving component 10 can be selected and used according to the actual application scenario. As long as it can be connected to the output shaft 111 for transmission, it is feasible to arrange the switching gear 22 in the first position or the second position according to the needs. The present application does not impose further restrictions on the specific setting form of the above-mentioned driving component 10.

[0080] Please refer to Figure 3 ,for Figure 1 The structural schematic diagram of the switching gear 22 in the transmission switching device shown is illustrated by taking the transmission connection between the driving component 10 and the switching component 20 through the driving worm wheel 12 and the driving worm 13 as an example for explanation. In the present application, a driving gear 23 which is transmission-connected to the output shaft 111 is further provided on the switching member 21, and the driving gear 23 is meshingly connected with the switching gear 22. Since the driving shaft 111 and the driving gear 23 are transmission-connected through the driving worm wheel 12 and the driving worm 13, and the driving gear 23 is provided on the switching member 21, the driving member 11 will drive the driving worm 13 to rotate while rotating, and the driving worm wheel 12 will further drive the driving gear 23 to rotate to further drive the switching member 21 to rotate, and the switching gear 22 is provided on the switching member 21 and meshingly connected with the driving gear 23, so the driving gear 23 will also drive the switching gear 22 to rotate while rotating.

[0081] Optionally, the driving assembly 10 can also drive the switching member 21 to rotate clockwise or counterclockwise, so that the switching gear 22 is selectively arranged in the first position or the second position, thereby directly or indirectly engaging with the material return device or the material feed device at the corresponding position.

[0082] In a specific embodiment, when the switching gear 22 is arranged in the first position, it will directly or indirectly engage with the material return device set at the first position. When the switching gear 22 is arranged in the second position, it will directly or indirectly engage with the material feeding device set at the second position. When the driving component 10 drives the switching member 21 to rotate clockwise, the switching gear 22 will be arranged in the first position. When the driving component 10 drives the switching member 21 to rotate counterclockwise, the switching gear 22 will be arranged in the second position.

[0083] Of course, the positions of the feeding equipment and the returning equipment can also be adjusted according to actual needs to reduce the space occupied by the transmission switching device, the returning equipment and the feeding equipment. The above adjustment methods are all allowed and this application does not impose further restrictions on this.

[0084] As an optional implementation, please continue to refer to Figure 3 It can be observed that the driving gear 23 and the driving assembly 10 can be connected through the first transmission rod 24 to drive the driving gear 23 and the switching member 21 to rotate when the driving member 11 rotates.

[0085] Exemplarily, a knurling 241 may be provided at a position where the first transmission rod 24 is connected to the driving gear 23 and the driving assembly 10 .

[0086] Exemplarily, a limiting surface 242 may be provided at the position where the first transmission rod 21 is connected to the driving gear 23 and the driving assembly 10, and an abutment surface 243 matching the limiting surface 242 may be provided at the position of the axial hole of the driving gear 23 and the driving assembly 10 corresponding to the limiting surface 242.

[0087] Exemplarily, a protrusion (not shown in the figure) can also be provided at the position where the first transmission rod 21 is connected to the driving gear 23 and the driving assembly 10, and a groove portion adapted to the protrusion is provided at the position of the axial hole of the driving gear 23 and the driving assembly 10 corresponding to the protrusion.

[0088] It can be understood that when the driving component 10 and the switching component 20 are connected by driving the worm wheel 12 and the driving worm 13, the shaft hole of the driving component 10 refers to the gear shaft hole of the driving worm wheel 12; when the driving component 10 and the switching component 20 are connected by the output gear and the reduction gear, the shaft hole of the driving component 10 refers to the gear shaft hole of the reduction gear; when the driving component 10 and the switching component 20 are connected by the output gear, the transmission gear, and the belt or the synchronous belt, the shaft hole of the driving component 10 refers to the gear shaft hole of the transmission gear; when the driving component 10 and the switching component 20 are connected by the reduction mechanism, the shaft hole of the driving component 10 refers to the shaft hole set on the reduction mechanism. As long as the driving member 11 drives the main control gear 23 and the switching member 21 to rotate through the first transmission rod 21 when rotating, the shaft hole setting form is feasible, and technical personnel in this field should know it.

[0089] Similarly, the transmission connection between the driving component 10 and the switching component 20 through the driving worm wheel 12 and the driving worm 13 is used as an example for explanation. Please continue to refer to Figure 2 It can be observed that the driving gear 23 and the driving worm wheel 12 are connected through the first transmission rod 24. The driving gear 23 and the driving worm wheel 12 are both provided with corresponding gear shaft holes. The first transmission rod 24 sequentially penetrates the driving worm wheel 12, the driving member 11 and the driving gear 23 provided on the driving member 11, thereby realizing the transmission connection between the driving gear 23 and the driving worm wheel 12. At this time, when the driving worm wheel 12 rotates, it will drive the driving gear 23 and the switching member 21 to rotate.

[0090] Optionally, in order to prevent the driving gear 23 and the driving member 11 from slipping or idling during rotation, please refer to Figure 4 ,for Figure 1 The structural schematic diagram of the knurling 241 in the transmission switching device shown in the figure shows that the knurling 241 is arranged at the connection position between the first transmission rod 24 and the driving gear 23 and the driving worm gear 12 in the present application, so as to ensure that the driving gear 23 and the switching member 21 are driven to rotate while the driving worm gear 12 rotates.

[0091] The knurling 241 can improve the matching accuracy between the driving gear 23 and the driving worm gear 12 , and this form has low noise and is easy to produce in actual applications, without the need to additionally set a stop limit structure for the driving worm gear 12 .

[0092] As an optional implementation, please refer to Figure 5 ,for Figure 1Schematic diagram of the structure of the limiting surface 242 in the shown transmission switching device. A limiting surface 242 can also be provided at the position where the first transmission rod 24 is connected to the driving gear 23 and the driving worm wheel 12. And an abutting surface 243 is provided at the position of the gear shaft holes of the driving gear 23 and the driving worm wheel 12 corresponding to the limiting surface 242. When the first transmission rod 24 sequentially passes through the driving worm wheel 12 and the driving gear 23, the abutting surface 243 abuts against the corresponding limiting surface 242, thereby increasing the friction between the first transmission rod 24 and the driving worm wheel 12 and the driving gear 23, and ensuring that while the driving worm wheel 12 rotates, it drives the driving gear 23 and the switching member 21 to rotate.

[0093] Certainly, the first transmission rod 24 can also be set in a prism shape, and the gear shaft holes of the driving gear 23 and the driving worm wheel 12 are set corresponding to this prism shape, which can also ensure that while the driving worm wheel 12 rotates, it drives the driving gear 23 and the switching member 21 to rotate.

[0094] It should be understood that the present application does not further limit the specific shape of the above-mentioned first transmission rod 24 and the shapes of the gear shaft holes of the driving gear 23 and the driving worm wheel 12. As long as it can ensure that while the driving worm wheel 12 rotates, it drives the driving gear 23 and the switching member 21 to rotate, such a method is feasible, and the present application does not further limit it.

[0095] This way of setting the limiting surface 242 and the abutting surface 243 is easy to assemble, but wear is likely to occur at the contact position after long-term use, resulting in a reduction in the matching accuracy between the driving gear 23 and the driving worm wheel 12. And this configuration has a large noise, and an additional stop and limit structure needs to be set for the driving worm wheel 12.

[0096] As an alternative implementation, a protrusion can also be provided at the position where the first transmission rod 24 is connected to the driving gear 23 and the driving worm wheel 12, and a groove portion adapted to the protrusion is provided at the position of the gear shaft holes of the driving gear 23 and the driving worm wheel 12 corresponding to the limiting surface 242. When the first transmission rod 24 sequentially passes through the driving worm wheel 12 and the driving gear 23, the protrusion is snapped into the groove portion, thereby increasing the friction between the first transmission rod 24 and the driving worm wheel 12 and the driving gear 23, and ensuring that while the driving worm wheel 12 rotates, it drives the driving gear 23 and the switching member 21 to rotate.

[0097] It should be understood that the present application does not further limit the specific shape and the actual number of the protrusions provided on the above-mentioned first transmission rod 24. As long as it can ensure that while the driving worm wheel 12 rotates, it drives the driving gear 23 and the switching member 21 to rotate, such a method is feasible, and the present application does not further limit it.

[0098] The fitting method in which the above-mentioned protruding part is clamped in the groove part is easy to assemble, the fitting accuracy between the driving gear 23 and the driving worm wheel 12 is high, and the noise is low and it is not easy to wear in practical applications. However, it is not easy to process and produce, and an additional stop and limit structure needs to be set for the driving worm wheel 12.

[0099] It can be seen that the above-mentioned knurling 241, limiting surface 242 and abutting surface 243, and the fitting method in which the protruding part is clamped in the groove part all have advantages and disadvantages. The connection form between the first transmission rod 24, the driving gear 23 and the driving worm wheel 12 can be set according to actual needs, and the present application does not make further restrictions on this.

[0100] Please refer to Figure 6 , for Figure 1 the three-dimensional assembly drawing of the switching member 21 in the shown transmission switching device. The switching member 21 provided in the present application includes two oppositely arranged limiting walls 211. The two limiting walls 211 clamp the driving gear 23 and the switching gear 22 between the two limiting walls 211, and through holes for the first transmission rod 24 to pass through are provided on the two limiting walls 211.

[0101] As an optional implementation manner, one end of the two limiting walls 211 can be connected by a clamping member 212. The two ends of the clamping member 212 are respectively connected to the corresponding limiting walls 211, and the clamping member 212 has a certain elasticity, so as to clamp the driving gear 23 and the switching gear 22 between the two limiting walls 211.

[0102] Furthermore, a buckle structure is provided at the other end of the two limiting walls 211, so as to realize the snap connection between the two limiting walls 211, which is convenient to adjust and replace the driving gear 23 and the switching gear 22 according to actual needs, and is convenient for the disassembly and installation of the driving gear 23 and the switching gear 22; of course, it is also feasible to replace the buckle structure at the other end of the two limiting walls 211 with the form of the above-mentioned clamping member 212. In principle, the setting positions of the two limiting walls 211 and the clamping member 212 should not affect the meshing connection between the switching gear 22 and the corresponding equipment.

[0103] As an optional implementation manner, the ends of the two limiting walls 211 can also be connected by means of threaded bolts, so as to increase the connection strength between the two limiting walls 211.

[0104] In the embodiment of the present application, in order to increase the friction force and prevent the switching member 21 from rotating smoothly due to unbalanced weight during rotation, a swing gear 25 meshing with the driving gear 23 can also be provided on the switching member 21.

[0105] Preferably, please continue to refer to Figure 6, the swing gear 25 can be set as a gear with a diameter and weight similar to those of the switching gear 22. The swing gear 25 and the switching gear 22 are oppositely arranged at both ends of the switching member 21 and are respectively meshed and connected with the driving gear 23. At this time, the weights at both ends of the switching member 21 are balanced, thereby increasing the overall friction between the driving gear 23, the switching gear 22, the swing gear 25 and the two limiting walls 211, and also enabling the switching member 21 to rotate more smoothly to avoid failures.

[0106] As an alternative embodiment, a switching rotating shaft 213 is provided at the position of the switching member 21 corresponding to the switching gear 22. The switching rotating shaft 213 penetrates through the gear shaft hole of the switching gear 22 to enable the switching gear 22 to rotate between the two limiting walls 211; a swing rotating shaft 214 is provided at the position of the switching member 21 corresponding to the swing gear 25. The swing rotating shaft 214 penetrates through the gear shaft hole of the swing gear 25 to enable the swing gear 25 to rotate between the two limiting walls 211. Through the above-mentioned switching rotating shaft 213 and swing rotating shaft 214, the switching gear 22 and the swing gear 25 are correspondingly arranged on the switching member 21.

[0107] In this application, the driving assembly 10 drives the switching member 21 to rotate clockwise or counterclockwise, so that the switching gear 22 is selectively arranged at the first position or the second position, thereby being directly or indirectly meshed with the material discharging device or the material feeding device at the corresponding position, and realizing the material discharging or material feeding of the consumables.

[0108] Based on the above transmission switching device, this application also provides a material discharging device, which includes a material discharging assembly 30, and can realize the material discharging of the consumables through the material discharging assembly 30 and the above transmission switching device.

[0109] As an alternative embodiment, please continue to refer to Figure 1 , the material discharging assembly 30 includes a material discharging roller 32 and a material discharging gear 31 connected to the material discharging roller 32. In actual printing, a material tray (not shown in the figure) can be placed on the material discharging roller 32. Since the material required for 3D printing is wound on the material tray, the material tray will rotate along its own axis during the process of feeding or discharging the consumables. In this application, the material discharging gear 31 is arranged on the material discharging roller 32. During the process of discharging the consumables, by driving the material discharging roller 32 to rotate, the excess consumables can be rewound onto the material tray.

[0110] In the embodiment of this application, when the switching gear 22 is arranged at the first position, it can be directly or indirectly meshed with the material discharging gear 31. At this time, by further driving the material discharging gear 31 to rotate through the rotation of the switching gear 22, the material tray placed on the material discharging roller 32 rotates counterclockwise to realize material discharging.

[0111] Specifically, when the switching gear 22 is directly connected to the unloading gear 31, since the tray mounted on the unloading roller 32 needs to rotate clockwise to achieve unloading, it is necessary to ensure that the unloading gear 31 and the unloading roller 32 rotate counterclockwise. At this time, it is necessary to control the switching gear 22 to rotate clockwise through the driving assembly 10. And the switching gear 22 is directly meshed with the driving gear 23, so it is necessary to ensure that the driving gear 23 rotates counterclockwise.

[0112] That is to say, when the switching gear 22 is directly connected to the unloading gear 31, it is necessary for the driving assembly 10 to control the driving gear 23 to rotate counterclockwise. At this time, the switching gear 22 meshed with the driving gear 23 rotates clockwise, so that the unloading gear 31 directly meshed with the switching gear 22 rotates counterclockwise. The unloading roller 32 and the unloading gear 31 are coaxially arranged and also rotate counterclockwise, so that the tray mounted on the unloading roller 32 rotates clockwise, and the excess consumables are rewound onto the tray to achieve the unloading of the consumables.

[0113] As an alternative embodiment, when the switching gear 22 is arranged at the first position, the indirect meshing between the switching gear 22 and the unloading gear 31 may be realized through the first gear assembly.

[0114] Exemplarily, as Figure 1 and Figure 2 shown, a first gear 33 is provided between the switching gear 22 and the unloading gear 31 in the present application. The outer tooth profiles of the first gear 33 are respectively meshed with the switching gear 22 and the unloading gear 31. Of course, several first gears 33 may also be provided between the switching gear 22 and the unloading gear 31, and the present application does not further limit the specific number of the first gears 33.

[0115] In the embodiment of the present application, when the number of the first gears 33 is configured to be an odd number, since the tray mounted on the unloading roller 32 needs to rotate clockwise to achieve unloading, it is necessary to ensure that the unloading gear 31 and the unloading roller 32 rotate counterclockwise. At this time, it is necessary to ensure that the first gear 33 directly meshed with the unloading gear 31 rotates clockwise. Since the number of the first gears 33 is an odd number, the first gear 33 directly meshed with the switching gear 22 should also rotate clockwise. Therefore, it is necessary to ensure that the switching gear 22 rotates counterclockwise, and the corresponding driving gear 23 should rotate clockwise.

[0116] Similarly, when the number of first gears 33 is configured as an even number, it is also necessary to ensure that the material return gear 31 and the material return roller 32 rotate counterclockwise. At this time, the first gear 33 directly meshing with the material return gear 31 rotates clockwise. Since the number of first gears 33 is an even number, the first gear 33 directly meshing with the switching gear 22 rotates counterclockwise. It is necessary to ensure that the switching gear 22 rotates clockwise, and the corresponding driving gear 23 should rotate counterclockwise.

[0117] That is to say, when the number of first gears 33 is an odd number, it is necessary to control the switching gear 22 to rotate counterclockwise to drive the material return gear 31 to rotate counterclockwise. When the number of first gears 33 is an even number, it is necessary to control the switching gear 22 to rotate clockwise to drive the material return gear 31 to rotate counterclockwise. In principle, no matter whether an odd number or an even number is set or no first gear 33 is set, it is necessary to ensure that the material return gear 31 and the material return roller 32 are driven to rotate counterclockwise, so that the material tray mounted on the material return roller 32 rotates clockwise to realize material return. This application will not go into details here.

[0118] Optionally, a silicone sleeve 321 may be provided on the material-removing roller 32 to apply sufficient friction force to the material tray when the material-removing roller 32 rotates, thereby ensuring that the material tray rotates clockwise to realize material removal.

[0119] As an optional implementation, a consumable material detection component may be provided to monitor the rotation information of the material return gear 31 , so as to obtain the returned amount of the consumable material.

[0120] In a specific embodiment provided in the present application, the above-mentioned consumable detection component can be set as a photoelectric encoder (not shown in the figure), and the photoelectric encoder is set to be connected to the material return gear 31. Since the photoelectric encoder will be driven to rotate synchronously when the material return gear 31 rotates, the photoelectric encoder can be used to collect the amount of consumables returned within a specific period of time. As for how to obtain the amount of consumables returned based on the rotation information of the material return gear 31, it is an existing technology widely used in the field of photoelectric encoders, and this application will not further elaborate on this.

[0121] In another specific embodiment provided in the present application, the above-mentioned consumable detection component can be set in the form of a Hall sensor (not shown in the figure) and a magnetic part. The magnetic part is set on the material return gear 31 as needed. During the material return process, the material return gear 31 drives the magnetic part to rotate synchronously. The Hall sensor is fixedly arranged at a position close to the material return gear 31. The Hall sensor can output a corresponding pulse signal according to the intensity of the magnetic field change of the magnetic part, and send the pulse signal to the main controller for signal processing, so as to calculate the current consumable return amount according to the pulse signal. Similarly, how the above-mentioned main controller calculates the current consumable return amount according to the pulse signal is an existing technology widely used in the field of mileage calculation by Hall sensors, and the present application will not go into details here.

[0122] Of course, the material discharge amount of the consumable can also be obtained through other forms of angular velocity detection, and the present application does not further limit the setting form of the above-mentioned consumable detection component.

[0123] In an optional embodiment, the above-mentioned driving member 11 can be set in the form of a driving motor. Please continue to refer to Figure 1 , a driving worm 13 is connected to the output shaft 111 of the driving motor in the present application. The driving worm 13 is meshed and connected with a driving worm wheel 12. The driving motor drives the driving worm 13 to further drive the driving worm wheel 12 to rotate clockwise or counterclockwise. Of course, as long as it can provide driving force to the driving gear 23 and the switching member 21 to make them rotate clockwise or counterclockwise and switch the switching gear 22 between the first position and the second position, any form of driving member 11 selected is feasible, and the present application does not further limit this.

[0124] Based on the above transmission switching device, the present application further provides a feeding device. The material discharging device includes a feeding component 40, and the feeding of the consumable is realized through the feeding component 40 and the above-mentioned transmission switching device.

[0125] As an optional implementation manner, please continue to refer to Figure 2 , the feeding component 40 provided in the present application includes a feeding gear set 42 and a feeding gear 41. The feeding gear set 42 and the feeding gear 41 are coaxially arranged, and a pressing gap (not shown in the figure) through which the consumable passes is provided in the feeding gear set 42. In the present application, by connecting the feeding gear 41 with the feeding gear set 42, when the switching gear 22 is arranged at the second position, the switching gear 22 is directly or indirectly meshed with the above-mentioned feeding gear 41, and the switching gear 22 drives the feeding gear 41 to rotate clockwise, thereby driving the feeding gear set 42 to rotate clockwise to extrude the consumable to realize feeding.

[0126] Specifically, when the switching gear 22 is directly connected to the feeding gear 41, since the feeding gear set 42 needs to rotate clockwise to feed the consumable, it is necessary to ensure that both the feeding gear 41 and the feeding gear set 42 rotate clockwise. At this time, the switching gear 22 should rotate counterclockwise, and the corresponding driving gear 23 rotates clockwise.

[0127] That is to say, when the switching gear 22 is directly connected to the feeding gear 41, it is necessary for the driving component 10 to control the driving gear 23 to rotate clockwise. At this time, the switching gear 22 meshed with the driving gear 23 rotates counterclockwise, so that the feeding gear 41 directly meshed with the switching gear 22 rotates clockwise, and the feeding gear set 42 coaxially arranged with the feeding gear 41 also rotates clockwise, so that the consumable is extruded to realize feeding.

[0128] As an alternative embodiment, when the switching gear 22 is arranged at the second position, the indirect meshing between the switching gear 22 and the feeding gear 41 can be realized through the first gear assembly.

[0129] Exemplarily, a first gear 33 (not shown in the figure) can be provided between the switching gear 22 and the feeding gear 41, and the outer tooth profiles of the first gear 33 are respectively meshed and connected with the switching gear 22 and the feeding gear 41. Of course, several first gears 33 can also be provided between the switching gear 22 and the feeding gear 41, and the present application does not further limit the specific number of the first gears 33.

[0130] Since the feeding gear set 42 needs to rotate clockwise to feed the consumables, it is necessary to ensure that both the feeding gear 41 and the feeding gear set 42 rotate clockwise. At this time, it is necessary to ensure that the first gear 33 directly meshed with the feeding gear 41 rotates counterclockwise. Since the number of the first gears 33 is odd, the first gear 33 directly meshed with the switching gear 22 should also rotate counterclockwise. Therefore, it is necessary to ensure that the switching gear 22 rotates clockwise, and the corresponding driving gear 23 should rotate counterclockwise.

[0131] Similarly, when the number of the first gears 33 is configured to be even, it is also necessary to ensure that both the feeding gear 41 and the feeding gear set 42 rotate clockwise. At this time, the first gear 33 directly meshed with the feeding gear 41 rotates counterclockwise. Since the number of the first gears 33 is even, the first gear 33 directly meshed with the switching gear 22 rotates clockwise. Then, it is necessary to ensure that the switching gear 22 rotates counterclockwise, and the corresponding driving gear 23 should rotate clockwise.

[0132] That is to say, when the number of the first gears 33 is odd, it is necessary to control the switching gear 22 to rotate clockwise to drive the feeding gear 41 to rotate clockwise. When the number of the first gears 33 is even, it is necessary to control the switching gear 22 to rotate counterclockwise to drive the feeding gear 41 to rotate clockwise. In principle, whether an odd number, an even number or no first gear 33 is set, it is necessary to ensure that the feeding gear 41 and the feeding gear set 42 are driven to rotate clockwise to drive the material tray to rotate counterclockwise, so that the consumables are extruded from the feeding device to achieve feeding. The above setting methods are all feasible, and the present application does not limit this too much.

[0133] As an alternative embodiment, a consumable detection component can also be provided to monitor the rotation information of the feeding gear 41, so as to obtain the feeding amount of the consumables.

[0134] Similarly, the above consumable detection component can be set as an optical encoder (not shown in the figure), and the optical encoder is set to be drivingly connected to the feeding gear 41. Since the feeding gear 41 drives the optical encoder to rotate synchronously while rotating, the feeding amount of the consumable within a certain specific time period can be collected by the optical encoder. The above consumable detection component can also be set in the form of a Hall sensor (not shown in the figure) and a magnetic member. The magnetic member is arranged on the feeding gear 41 as required, and the magnetic member is driven to rotate synchronously by the discharging gear 31 during the feeding process. The Hall sensor is fixedly arranged at a position close to the feeding gear 41 to further obtain the current feeding amount of the consumable.

[0135] Of course, the feeding amount of the consumable can also be obtained through other forms of angular velocity detection, and the present application does not further limit the setting form of the above consumable detection component.

[0136] Based on the above transmission switching device, discharging device, and feeding device, please refer to Figure 11 , for Figure 8 the structural schematic diagram of the housing 51 in the 3D printer shown. The present application also provides a 3D printer, which is provided with a frame 50 for mounting the above transmission switching device, discharging device, and feeding device, and a housing 51 for accommodating the above transmission switching device, discharging device, and feeding device.

[0137] As an optional implementation manner, please refer to Figure 7 , for Figure 1 the structural schematic diagram of the first gear 33 in the transmission switching device shown. The present application provides a first gear 33 meshing with the discharging gear 31 on the frame 50, and a first limiting groove 216 is provided at the position of the switching member 21 corresponding to the first gear 33. At this time, when the switching gear 22 is arranged at the first position and indirectly meshes with the discharging gear 31, the first limiting groove 216 will abut against the side wall of the frame 50 to limit the switching gear 22 at the first position.

[0138] Since when the switching gear 22 is arranged at the first position and indirectly meshes with the discharging gear 31, the first limiting groove 216 will abut against the side wall of the frame 50, and when it is arranged at the second position and indirectly meshes with the feeding gear 41, the side wall of the switching member 21 will also abut against the side wall of the frame 50. Therefore, a position detection mechanism can be provided at the positions of the frame 50 corresponding to the above first position and second position to determine whether the switching gear 22 is arranged at the first position, the second position, or between the first position and the second position. Of course, the position detection mechanism can be set as an optoelectronic detection mechanism, a Hall detection mechanism, a mechanical detection mechanism, or other detection mechanisms. As long as it is any setting form that can detect the current position of the switching gear 22, it is feasible, and the present application does not further limit this.

[0139] It should be noted that since the transmission switching device, the material discharging device, and the material feeding device are all arranged in the frame 50, the frame 50 can be set as an integrally formed structure or a detachable structure according to requirements. Setting it as an integrally formed structure can ensure the overall structural strength of the frame 50 and reduce the production cost after mold opening. After setting it as a detachable structure, it is convenient to disassemble and maintain the transmission switching device, the material discharging device, or the material feeding device. All the above setting methods are feasible.

[0140] Of course, a cover (not shown in the figure) can also be provided on the frame 50 to protect the structures integrated in the frame 50, avoid the influence of dust deposition on the working accuracy of the transmission switching device, the material discharging device, or the material feeding device, and increase the later maintenance cost.

[0141] Furthermore, several sets of matching transmission switching devices, material discharging devices, and material feeding devices can be arranged in the housing 51, which can simultaneously realize the feeding and discharging operations of several trays.

[0142] Exemplarily, please refer to Figure 9 , for Figure 8 the structural schematic diagram of the frame 50 in the 3D printer shown. In this application, 4 sets of matching transmission switching devices, material discharging devices, and material feeding devices are arranged in the housing 51, which can simultaneously realize the feeding and discharging operations of four trays. Of course, the number of the above-mentioned transmission switching devices, material discharging devices, and material feeding devices can be adjusted according to the actual volume of the housing 51. This application does not make further restrictions on this.

[0143] Optionally, please refer to Figure 10 , for Figure 8 the structural schematic diagram of the material outlet 52 in the 3D printer shown. In this application, a material outlet 52 is also arranged at the bottom of the housing 51 corresponding to the feeding, so that the consumables pass through the material outlet 52 to cooperate with the 3D printer for model printing. A sealing port 53 is also arranged at the bottom of the housing 51, which can prevent the consumables from absorbing humid air and affecting the printing effect.

[0144] For other details of implementing the above technical solutions in the above 3D printer, reference can be made to the descriptions of the transmission switching device, the material discharging device, and the material feeding device provided in the embodiments of the above application, which will not be elaborated here.

[0145] The transmission switching device, feeding equipment, material return equipment and 3D printer provided in the embodiments of the present application are used for feeding and returning consumables wound on a material tray. The switching gear is arranged in the first position or the second position through the driving component to transmit the driving force of the driving member to the device directly or indirectly meshing with the switching gear to realize the feeding or returning of the consumables. The present application controls the output shaft and the switching member connected to the output shaft to rotate through the driving member, so that the switching gear arranged on the switching member is directly or indirectly meshed with the corresponding feeding device or material return device, thereby transmitting the driving force of the driving member to the device directly or indirectly meshing with the switching gear. By switching the switching gear between the first position and the second position, the demand for switching between the feeding state and the withdrawing state of the filament is met, the feeding and withdrawing reliability of the filament is improved, and the 3D printing efficiency and printing quality are ensured; a first gear meshingly connected to the feeding device or the withdrawing device is arranged at the first position and / or the second position, and the number of the first gears and the rotation direction of the switching gear are adjusted to meet the clockwise or counterclockwise rotation demand of the material tray to achieve a higher torque, and the present application does not need to separately set a driving part for the feeding device or the withdrawing device, thereby reducing the occupied space and effectively reducing the production cost.

[0146] It can be understood that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, 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.

[0147] The above embodiments are merely exemplary embodiments used to illustrate the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A transmission switching device for feeding and withdrawing consumables on a tray, characterized in that: include: A switching assembly, comprising a switching member and a switching gear disposed on the switching member; A driving assembly, comprising a driving member and an output shaft disposed on the driving member, wherein the output shaft is drivingly connected to the switching member; The driving assembly is configured to selectively arrange the switching gear in a first position or a second position so as to transmit the driving force of the driving member to a device directly or indirectly meshed with the switching gear.

2. The transmission switching device according to claim 1, characterized in that: The transmission switching device further comprises a first gear assembly, the first gear assembly comprising at least one first gear, the first gear being meshedly connected with the switching gear arranged at the first position or the second position to transmit the driving force of the driving member to the device meshed with the first gear; When the number of the first gears is 2n-1, the switching gear and the material tray have opposite rotation directions; when the number of the first gears is 2n, the switching gear and the material tray have the same rotation direction.

3. The transmission switching device according to claim 1, characterized in that: The driving assembly further comprises a driving worm arranged on the output shaft, and a driving worm wheel drivingly connected to the switching member, wherein the driving worm is meshingly connected to the driving worm wheel; or, The driving assembly further comprises an output gear disposed on the output shaft, and a transmission gear drivingly connected to the switching member, wherein the output gear and the transmission gear are connected to each other via a synchronous belt; and / or, The driving assembly further comprises a speed reduction mechanism disposed on the output shaft, and the speed reduction mechanism is drivingly connected to the switching member.

4. The transmission switching device according to any one of claims 1 to 3, characterized in that: The switching member is also provided with a driving gear meshingly connected with the switching gear, and the driving gear is drivingly connected with the output shaft of the driving assembly; The driving assembly is configured to drive the switching member to rotate clockwise or counterclockwise so that the switching gear is selectively arranged in the first position or the second position.

5. The transmission switching device according to claim 4, characterized in that: The driving gear and the driving assembly are connected in transmission via a first transmission rod, so as to drive the driving gear and the switching member to rotate when the driving member rotates.

6. The transmission switching device according to claim 5, characterized in that: The first transmission rod is provided with knurling at the positions where it is connected with the driving gear and the driving assembly; And / or, a limiting surface is provided at a position where the first transmission rod is connected to the driving gear and the driving assembly, and an abutment surface matching the limiting surface is provided at a position of the axial hole of the driving gear and the driving assembly corresponding to the limiting surface; And / or, a protrusion is provided at a position where the first transmission rod is connected to the driving gear and the driving assembly, and a groove matched with the protrusion is provided at a position of the axial hole of the driving gear and the driving assembly corresponding to the protrusion.

7. The transmission switching device according to claim 5, characterized in that: The switching member comprises two limiting walls arranged opposite to each other, and the two limiting walls are provided with through holes for the first transmission rod to pass through; The driving gear and the switching gear are arranged between the two limiting walls.

8. The transmission switching device according to claim 5, characterized in that: The switching member is also provided with a swing gear meshingly connected with the driving gear, and the swing gear and the switching gear are arranged at two ends of the switching member opposite to each other; The switching member is provided with a switching shaft for the switching gear to rotate at a position corresponding to the switching gear, and a swing shaft for the swing gear to rotate is provided at a position corresponding to the swing gear.

9. A material return device, characterized in that: include: The transmission switching device according to any one of claims 1 to 8; and, A material unloading assembly, the material unloading assembly includes a material unloading roller and a material unloading gear connected to the material unloading roller, the material unloading gear is configured to directly or indirectly engage with the switching gear, and the switching gear drives the material unloading gear to rotate counterclockwise to drive the material tray on the material unloading roller to rotate clockwise to realize material unloading.

10. The material return device according to claim 9, characterized in that: When the switching gear is arranged at the first position, the first gear assembly is connected to the switching gear and the material-removing gear respectively; Among them, when the number of the first gears is an odd number, the switching gear rotates counterclockwise to drive the material unloading gear to rotate counterclockwise; when the number of the first gears is an even number, the switching gear rotates clockwise to drive the material unloading gear to rotate counterclockwise, and the material unloading is achieved by the counterclockwise rotation of the material unloading gear to drive the material tray to rotate clockwise.

11. A feeding device, characterized in that: include: The transmission switching device according to any one of claims 1 to 8; and, A feed assembly, wherein the feed assembly includes a feed gear set and a feed gear, wherein the feed gear is connected to the feed gear set, and the feed gear is configured to directly or indirectly mesh with the switching gear, and the switching gear drives the feed gear to rotate clockwise to drive the feed gear set to rotate clockwise to extrude the consumables to achieve feeding.

12. The feeding device according to claim 11, characterized in that When the switching gear is arranged in the second position, the first gear assembly is connected to the switching gear and the feeding gear respectively; Among them, when the number of the first gears is an odd number, the switching gear rotates clockwise to drive the feed gear to rotate clockwise; when the number of the first gears is an even number, the switching gear rotates counterclockwise to drive the feed gear to rotate clockwise, and the feeding is achieved by the clockwise rotation of the feed gear to drive the material tray to rotate counterclockwise.

13. A 3D printer, characterized in that: The 3D printer comprises the transmission switching device as described in any one of claims 1-8, or comprises the material return device as described in any one of claims 9-10, or comprises the material feeding device as described in any one of claims 11-12.

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