WO2023104105A1

WO2023104105A1 - Transmission device and printer

Info

Publication number: WO2023104105A1
Application number: PCT/CN2022/137286
Authority: WO
Inventors: 刘付杰
Original assignee: 深圳市纵维立方科技有限公司
Priority date: 2021-12-08
Filing date: 2022-12-07
Publication date: 2023-06-15
Also published as: CN216804443U

Abstract

Disclosed in the present application are a transmission device and a printer. An abutting assembly acts on an adjusting part, so that self-compensation of the transmission device on the basis of the degree of wear is achieved, thereby guaranteeing that the transmission device is always tightly attached to a screw rod. According to the main technical solution of the present application, provided is a transmission device used for a 3D printer, the transmission device comprising: a transmission nut, wherein the transmission nut is configured to be in threaded connection with a screw rod, and the transmission nut is provided with an adjusting part; and an abutting assembly, wherein the abutting assembly is arranged on an outer side of the transmission nut, the abutting assembly is used for providing an elastic force for pressing the adjusting part, and the adjusting part radially shrinks under the pressing of the abutting assembly, so that the transmission nut is attached to the screw rod. The present application is mainly used for the power transmission of the screw rod and a printing platform.

Description

A kind of transmission device and printer

technical field

The present application relates to the technical field of 3D printing, in particular to a transmission device and a printer.

Background technique

In a 3D printer, the printing platform cantilever is connected to the Z-axis guide frame and the screw motor, and under the action of the screw motor, it moves up and down along the Z-axis guide frame to drive the printing platform to move, thereby realizing layer-by-layer printing. The cantilever of the printing platform and the screw of the screw motor are usually connected by a nut. The nut is screwed on the screw through the central threaded through hole. The cantilever of the printing platform is fixedly connected with the nut. When the screw rotates, the nut is driven by the thread to drive the printing platform. When the cantilever moves, the fitting degree of the thread between the nut and the screw directly affects the transmission quality. The tight fit between the nut and the screw thread can make the transmission effect better and the printing more accurate.

In the existing products, the general nut is connected to the screw rod. Since the contact surface between the screw rod and the nut cannot be kept in close contact, when there is a gap between the screw rod and the nut contact surface, the printing accuracy will decrease, which will affect the actual printing model. size.

Contents of the invention

In view of this, the embodiment of the present application provides a transmission device, which realizes self-compensation of the transmission device according to the degree of wear mainly through the function of the pressing component and the adjustment part, and ensures that the transmission device and the screw rod are always in close contact.

In order to achieve the above object, the application mainly provides the following technical solutions:

On the one hand, the embodiment of the present application provides a transmission device for a 3D printer, including:

The transmission nut is used to be screwed to the screw rod, and the transmission nut is provided with an adjustment part;

a pressing component, the pressing component is arranged outside the drive nut;

The pressing component is used to provide elastic force for squeezing the adjusting part, and the adjusting part shrinks radially under the pressing of the pressing component, so that the drive nut fits the screw rod.

The pressing assembly includes a connected tightening ring and an elastic component, the tightening ring is sleeved on the adjusting part, and the elastic component is connected with the drive nut and the tightening ring; the elastic component is used to provide elastic force to make the tightening ring squeeze the adjusting part.

The adjusting part includes an outer tapered surface, and the tightening ring includes a tapered inner wall adapted to the outer tapered surface of the adjusting part, and the tapered inner wall is in sliding contact with the outer tapered surface.

Drive nuts include main nuts and auxiliary nuts;

The main nut and the auxiliary nut are used to be screwed to the screw rod respectively, and the adjustment part is arranged on the auxiliary nut;

Both ends of the pressing component are respectively connected with the adjustment part and the main nut, and the pressing component is also used to provide external force in opposite directions to the main nut and the auxiliary nut, so that the main nut and the auxiliary nut axially compress the screw rod respectively.

The main nut is provided with a first limiting part, and the auxiliary nut is provided with a second limiting part. The first limiting part and the second limiting part are used to cooperate with each other to fix the circumferential relative positions of the main nut and the auxiliary nut.

The first limiting part is at least one card slot arranged on the main nut, the second limiting part is at least one card seat arranged on the auxiliary nut, and at least one card seat is used to be embedded in at least one card slot, so that the main The circumferential relative positions of the nut and the auxiliary nut are fixed.

The adjustment part includes an opening, and the adjustment part is used for radial contraction by reducing the opening under the extrusion of the pressing component;

The number of openings is at least two, and the at least two openings are evenly distributed in the circumferential direction of the drive nut.

The adjustment part is arranged on the first end of the transmission nut, and the second end of the transmission nut opposite to the first end is provided with a fixing part, and the two ends of the pressing component are respectively connected with the adjustment part and the fixing part.

On the other hand, an embodiment of the present application further provides a printer, including any transmission device described above.

Also includes: base, Z-axis guide assembly, cantilever, motor, screw rod;

The Z-axis guide assembly is connected to the base, the motor is arranged in the base, the screw rod is connected to the motor, the transmission device is connected to the cantilever, and the transmission device is screwed to the screw rod;

The motor is used to drive the screw to rotate, and the screw drives the transmission device through the screw thread to drive the cantilever to rise or fall along the Z-axis guide assembly.

The transmission device proposed in the embodiment of the present application mainly realizes self-compensation of the transmission device according to the degree of wear through the function of the pressing component and the adjustment part, and ensures that the transmission device and the screw rod are always in close contact. In the prior art, the nut is affected by long-term wear, which will cause the screw rod and the nut to no longer be in close contact, resulting in a decrease in printing accuracy and affecting the actual size of the printed model. Compared with the prior art, in this application document, by setting the adjustment part on the transmission device, when there is looseness between the transmission device and the screw rod, the pressing component squeezes the adjustment part, so that the adjustment part shrinks radially, and then sticks to the adjustment part. Close the screw rod to achieve the purpose of tightly screwing the drive nut and the screw rod, and ensure the accuracy of the thread transmission between the screw rod and the nut.

Description of drawings

Fig. 1 is a three-dimensional exploded schematic diagram of the composition structure of a transmission device provided by the embodiment of the present application;

Fig. 2 is an exploded schematic diagram of a transmission device composition structure provided by the embodiment of the present application at a first viewing angle;

FIG. 3 is a schematic structural diagram of a transmission device provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of the overall three-dimensional structure of a printer provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of a partial structure of a printer provided by an embodiment of the present application at a first viewing angle;

FIG. 6 is a schematic diagram of a partial structure of a printer provided in an embodiment of the present application at a second viewing angle.

Detailed ways

In order to further explain the technical means and effects adopted by this application to achieve the intended application purpose, the specific implementation, structure, characteristics and effects of the transmission device proposed according to this application will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. The description is as follows.

On the one hand, as shown in Figures 1-3, the embodiment of the present application provides a transmission device, including:

A transmission nut 10, the transmission nut 10 is used to be screwed to the screw rod, and the transmission nut 10 is provided with an adjustment part 20;

A pressing assembly 30, the pressing assembly 30 is arranged on the outside of the drive nut 10;

The pressing assembly 30 is used to provide elastic force to press the adjusting part 20 , and the adjusting part 20 shrinks radially under the pressing of the pressing assembly 30 , so that the drive nut 10 fits the screw rod.

The transmission device acts as a transmission between the screw rod and the cantilever of the printing platform. The transmission nut 10 is provided with a threaded through hole, the internal thread of the threaded through hole matches the external thread of the screw rod, and the transmission nut 10 is threaded on the screw rod.

The transmission nut 10 and the adjustment part 20 can be in various forms. In one embodiment, the transmission nut 10 is approximately cylindrical, the first end of the transmission nut 10 is used to connect the cantilever of the printing platform, and the adjustment part 20 is arranged on the transmission One end of the nut 10 , or, in another embodiment, the drive nut 10 is approximately cylindrical, and the adjusting part 20 is disposed at a middle position of the drive nut 10 . When the adjustment part 20 is arranged at the end of the transmission nut 10, an opening is provided on the adjustment part 20 so that the adjustment part 20 can shrink radially, or when the adjustment part 20 is arranged at the middle position of the transmission nut 10, the adjustment part 20 includes a plurality of The outer wall of the regulating piece is inclined, and the drive nut 10 is provided with multiple regulating hollow grooves in the circumferential direction. The radially thinner ends of the multiple regulating pieces are connected to the hollowed grooves, and the radially thicker ends of the multiple regulating pieces are suspended at the hollowed grooves. The pressing assembly 30 is used to press a plurality of adjusting pieces from the radially thinner end to the radially thicker end of the adjusting pieces, so that the adjusting pieces are close to the screw rod, and then the drive nut 10 is attached to the screw rod. The adjustment part 20 is not limited to the above two forms, and the structure that can radially contract under the action of an external force or drive the transmission nut 10 to radially contract so that the transmission nut 10 and the screw rod are within the scope of protection of this technical solution.

It can be understood that the adjusting part 20 can act alone to enhance the degree of fit. For example, the inner ring of the adjusting part 20 can be provided with threads, and the adjusting part 20 can be tightly attached to the screw by shrinking inward (that is, shrinking in the radial direction), or, The adjustment part 20 acts on the transmission nut 10, that is, the adjustment part 20 may not be provided with threads, and the adjustment part 20 drives the transmission nut 10 to shrink radially and then closely fits with the screw rod, or, the adjustment part 20 and the transmission nut 10 are both provided with internal threads A part of the adjustment part 20 and the drive nut 10 shrinks radially to achieve enhanced fit.

The pressing assembly 30 always squeezes the adjustment part 20, so that the adjustment part 20 always has a tendency to shrink radially. The trend can eliminate the looseness in time, so that the transmission nut 10 and the screw rod are always in close contact, and the transmission nut 10 will not be over-extruded with the screw rod, thereby avoiding the problem of nut wear.

The transmission device proposed in the embodiment of the present application mainly realizes self-compensation of the transmission device according to the degree of wear through the function of the pressing component and the adjustment part, and ensures that the transmission device and the screw rod are always in close contact. In the prior art, ordinary nuts do not have this function, and the contact surface between the screw and the nut cannot be kept in close contact all the time, and the nut is affected by long-term wear, which will cause the screw and the nut to no longer be in close contact, resulting in a decrease in printing accuracy and affecting the printed model actual size. Compared with the prior art, in this application document, by setting the adjustment part on the transmission device, when there is looseness between the transmission device and the screw rod, the pressing component squeezes the adjustment part, so that the adjustment part shrinks radially, and then sticks to the adjustment part. Close the screw rod to achieve the purpose of tightly screwing the drive nut and the screw rod, and ensure the accuracy of the thread transmission between the screw rod and the nut.

Wherein, the pressing assembly 30 can be an integral structure, one end of the pressing assembly 30 is connected to the transmission nut 10, and the other end abuts on the adjusting part 20, and elastically squeezes the adjusting part 20 through its own elastic force. For example, the adjusting part 20 includes The outer cone surface, the pressing component 30 is a spring, the spring is sleeved on the drive nut 10, the first end of the spring is in contact with the drive nut 10, the second end is in contact with the outer cone surface of the adjustment part 20, the spring is in a compressed state, and the second end of the spring is in contact with the drive nut 10. The two ends always have a tendency to move from the end with a smaller circumference of the adjustment part 20 to the end with a larger circumference, thereby squeezing the adjustment part 20;

Or, since the pressing assembly 30 has the function of providing elastic force and pressing the adjustment part 20, according to the function of the pressing assembly 30, the pressing assembly 30 includes a connected constriction ring 31 and an elastic member 32, and the constriction ring 31 Sleeved on the adjustment part 20 , the elastic member 32 is connected with the drive nut 10 and the tightening ring 31 ; the elastic member 32 is used to provide elastic force to make the tightening ring 31 squeeze the adjusting part 20 .

The tightening ring 31 is sleeved on the outside of the adjusting part 20 and abuts against the outer wall of the adjusting part 20 to squeeze the adjusting part 20. The elastic member 32 connects the drive nut 10 and the tightening ring 31 to provide elastic force. . The tightening ring 31 and the elastic member 32 are provided, compared with the one-piece pressing assembly 30, the processing is more convenient, and the squeezing effect can be improved by finely processing the tightening ring 31. For example, the adjustment part 20 includes an outer tapered surface, The constriction ring 31 includes a tapered inner wall adapted to the outer tapered surface of the adjustment part 20 , and the tapered inner wall is in sliding contact with the outer tapered surface. The elastic member 32 is used to make the tightening ring 31 always have a tendency to move from the end with a smaller circumference of the adjustment part 20 to the end with a larger circumference, and then when there is looseness between the drive nut 10 and the screw rod, it will pass through the conical surface. The extrusion action fits the screw tightly in time. The conical inner wall of the constriction ring 31 makes the contact area between the constriction ring 31 and the adjustment part 20 larger, the force is stronger, and the rigid wear of the constriction ring 31 on the adjustment part 20 is less likely to occur.

Further, the transmission nut 10 can be of an integrated structure, the adjustment part 20 is arranged at one end of the transmission nut 10, the adjustment part 20 includes an outer tapered surface, and the integral pressing assembly 30 connects the transmission nut 10 and the adjustment part 20, or a tightening ring 31 Abutting against the adjustment part 20 , the elastic member 32 connects the drive nut 10 and the constriction ring 31 . The drive nut 10 can also be a split structure, specifically, the drive nut 10 includes a main nut 11 and a secondary nut 12 . The main nut 11 and the auxiliary nut 12 are respectively used to be screwed to the screw rod, and the adjusting part 20 is arranged on the auxiliary nut 12 . Both ends of the pressing assembly 30 are respectively connected with the adjustment part 20 and the main nut 11, and the pressing assembly 30 is also used to provide external forces in opposite directions to the main nut 11 and the auxiliary nut 12, so that the main nut 11 and the auxiliary nut 12 are respectively axially Compress the screw.

The adjustment part 20 is arranged on the first end of the auxiliary nut 12, the second end of the auxiliary nut 12 opposite to the first end is used for docking with the first end of the main nut 11, and the second end of the main nut 11 opposite to the first end The second end is used to connect the cantilever of the printing platform. When the pressing assembly 30 is an integral structure, the pressing assembly 30 connects the main nut 11 and the adjustment part 20. If the pressing assembly 30 is a spring, the spring is sleeved on the main nut 11 and the auxiliary On the nut 12 , one end of the spring is connected to the second end of the main nut 11 , and the other end abuts against the outer tapered surface of the adjusting part 20 . Alternatively, the pressing assembly 30 includes a tightening ring 31 and an elastic member 32, the elastic member 32 is sleeved on the main nut 11 and the auxiliary nut 12, and the two ends of the elastic member 32 are respectively connected to the second end of the tightening ring 31 and the main nut 11. The ends are connected, and the constriction ring 31 abuts against the adjustment part 20 . The above pressing assembly 30 or elastic member 32 plays the role of pushing the main nut 11 and the auxiliary nut 12 in different axial directions of the screw shaft, so that the main nut 11 and the auxiliary nut 12 have a tendency to move away from each other in the axial direction, and then When the drive nut 10 and the lead screw become loose, they move axially to achieve close fit.

Further, the main nut 11 is provided with a first limiting portion 13, and the auxiliary nut 12 is provided with a second limiting portion 14, the first limiting portion 13 and the second limiting portion 14 are used to cooperate with each other to make the main nut 11 The position relative to the peripheral nut 12 is fixed.

The forms of the first limiting portion 13 and the second limiting portion 14 can be various, aiming at preventing relative circumferential movement between the main nut 11 and the auxiliary nut 12, so that the main nut 11 and the auxiliary nut 12 move synchronously, Prevent secondary nut 12 from detaching from main nut 11.

Specifically, the first stopper 13 is at least one slot provided on the main nut 11, the second stopper 14 is at least one seat provided on the auxiliary nut 12, and at least one seat is used to insert at least one In the card slot, the circumferential relative positions of the main nut 11 and the auxiliary nut 12 are fixed.

The number of the card seat and the card slot can be two, and the card slot is arranged on the radial sides of the opening of the main nut 11 for docking with the auxiliary nut 12, and the card seat is arranged on the auxiliary nut 12 for docking with the main nut 11 at one end radial sides of the opening. Specifically, the deck may be a square deck. In other embodiments, the card seat can also be changed corresponding to the shape of the card slot, for example, the card seat forms a triangular protrusion, and the card slot forms a triangular depression.

Further, an opening 21 is provided on the adjustment part 20 , and the adjustment part 20 is used for radial contraction by narrowing the opening 21 under the extrusion of the pressing assembly 30 . The number of openings 21 is at least two, and the at least two openings 21 are evenly distributed in the circumferential direction of the drive nut 10 .

Specifically, there may be three openings 22, and the openings 22 are evenly distributed in the circumferential direction of the transmission nut 10. Taking the transmission nut 10 including the main nut 11 and the auxiliary nut 12 as an example, the openings 22 start at the end of the adjustment part 20 opposite to the main nut 11. Extending to the side wall of the auxiliary nut 12, the adjustment part 20 can be regarded as an adjustment claw with an inclination on the three outer surfaces connected to one end of the auxiliary nut 12. The adjustment claw is radial to the side wall in the direction away from the auxiliary nut 12. The thickness gradually becomes thicker, forming a slope. When the pressing component 30 or the tightening ring 31 squeezes the adjusting part 20, the opening 21 shrinks, that is, the three adjusting claws approach each other, and the side wall of the secondary nut 12 is driven to tighten.

Further, the adjustment part 20 is arranged on the first end of the transmission nut 10, and the second end of the transmission nut 10 opposite to the first end is provided with a fixing part 50, and the two ends of the pressing assembly 30 are connected with the adjustment part 20 and the fixing part respectively. 50 connections.

The fixing part 50 can be a ring-shaped fixing plate, and the fixing plate is provided with a through hole or a screw hole, which is used to connect the cantilever of the printing platform. When the pressing component 30 is an integral structure, the pressing component 30 is a spring, and the spring is sleeved on the drive nut 10, and the two ends of the spring are respectively connected with the adjusting part 20 and the fixing part 50, and the spring is always in a compressed state. Alternatively, when the pressing assembly 30 is a split structure, the tightening ring 31 is sleeved on the adjusting portion 20 , and the two ends of the elastic member 32 are respectively connected to the tightening ring 31 and the fixing portion 50 .

According to the descriptions of the above-mentioned embodiments, the adjusting part 20 designed in this application can be closely attached to the screw rod to eliminate the gap, and the designed first limiting part 13 and second limiting part 14 can make The main nut 11 and the auxiliary nut 12 do not move relative to each other in the circumferential direction, so that the main nut 11 and the auxiliary nut 12 move synchronously to prevent the auxiliary nut 12 from being separated from the main nut 11. When rotating on the screw rod, a rotating whole is formed. . Before being assembled to the screw rod, the first limiting part 13 can be adjusted under the premise that the first limiting part 13 and the second limiting part 14 are kept in cooperation so that the circumferential relative positions of the main nut 11 and the auxiliary nut 12 are fixed. The distance between the second limiting portion 14 and the relative distance between the main nut 11 and the auxiliary nut 12 are adjusted, so as to adjust the compression amount of the spring. After being assembled on the screw rod, the force applied to the adjustment part 20 can be effectively controlled, and then the force applied to the adjustment part 20 on the screw rod can be adjusted. To a certain extent, the adjustment part 20 can be better attached to the screw rod. At the same time, excessive wear on the screw rod due to excessive force on the adjusting part 20 can also be avoided.

On the other hand, as shown in FIGS. 4-6 , an embodiment of the present application further provides a printer, including any one of the above-mentioned transmission devices, including the advantages of any one of the above-mentioned transmission devices, which will not be repeated here.

The printer also includes a base 01, a Z-axis guide assembly 02, a cantilever 03, a motor 04, and a screw rod 05. The Z-axis guide assembly 02 is connected to the base 01, the motor 04 is arranged in the base 01, the screw rod 05 is connected to the motor 04, the transmission device is connected to the cantilever 03, and the transmission device is screwed to the screw rod 05. The motor 04 is used to drive the screw rod 05 to rotate, and the screw rod 05 pushes the transmission device through the thread action to drive the cantilever 03 to rise or fall along the Z-axis guide assembly 02 .

One end of the cantilever 03 is used to connect to the printing platform 07, and the other end is slidingly connected with the Z-axis guide assembly 02. A through hole is set between the two ends of the cantilever 03. Taking the direction of the printer as an example, the transmission device can be the secondary nut 12 under the main nut 11 Through the through hole in the upper direction, the fixed part 50 is connected and fixed by the upper opening edge of the through hole of the cantilever 03 and the cantilever 03. Specifically, it can be connected by bolts. The radial width of the through hole is greater than the width of the spring outer diameter of the transmission device, so that The spring can freely expand and contract in the through hole. The motor 04 is arranged in the base 01 and is fixed on the top plate 06. The threaded mandrel 05 extends upward through the through hole provided in the top plate 06, and then the thread of the threaded mandrel 05 passes through the auxiliary nut 12 and the main nut 11 in sequence, and the The top of the fixing part 50 passes through. The tight fit between the transmission device and the screw rod 05 makes the transmission more accurate, and then effectively drives the printing platform 07 to move up and down to ensure the accuracy of the model forming. In addition, where the threaded rod 05 passes through the top plate 06 and extends upwards, a rubber ring can also be set in the threaded rod 05 to prevent printing materials such as resin of the printer from flowing into the base 01 through the through hole and damage the components of the printer.

The following is a one-time description of the technical solution of the application:

a pressing component, the pressing component is arranged outside the drive nut;

The pressing assembly includes a connected tightening ring and an elastic component, the tightening ring is sleeved on the adjustment part, and the elastic component is connected with the drive nut and the tightening ring;

The elastic component is used to provide elastic force to make the tightening ring squeeze the adjustment part.

Drive nuts include main nuts and auxiliary nuts;

Also includes: base, Z-axis guide assembly, cantilever, motor, screw rod;

The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto. The above-mentioned technical features can be combined according to requirements to obtain other implementation modes. Within the scope of the disclosed technology, changes or substitutions can be easily conceived, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A kind of transmission device, is used for 3D printer, is characterized in that, comprises:

A transmission nut, the transmission nut is used to be screwed to the screw rod, and the transmission nut is provided with an adjustment part;

a pressing component, the pressing component is arranged outside the drive nut;

The pressing component is used to provide elastic force for pressing the adjusting part, and the adjusting part shrinks radially under the pressing of the pressing component, so that the drive nut is in contact with the screw rod.
The transmission device according to claim 1, wherein the pressing assembly comprises a constriction ring and an elastic member, the constriction ring is sleeved on the adjustment part, and the elastic member is connected to the transmission nut and the elastic member. the tightening ring is connected;

The elastic component is used to provide elastic force to make the tightening ring squeeze the adjustment part.
The transmission device according to claim 2, wherein the adjusting part includes an outer tapered surface, and the tightening ring includes a tapered inner wall adapted to the outer tapered surface of the adjusting part, and the tapered The inner wall is in sliding contact with the outer tapered surface.
The transmission device according to claim 1, wherein the transmission nut comprises a main nut and an auxiliary nut;

The main nut and the auxiliary nut are respectively used to be screwed to the screw rod, and the adjustment part is arranged on the auxiliary nut;

The pressing assembly is respectively connected with the adjustment part and the main nut, and the pressing assembly is also used to provide an external force in the opposite direction to the main nut and the auxiliary nut, so that the main nut and the auxiliary nut The secondary nuts axially compress the screw rods respectively.
The transmission device according to claim 4, characterized in that, the main nut is provided with a first limiting portion, the auxiliary nut is provided with a second limiting portion, and the first limiting portion and the The second limiting portion is used to cooperate with each other to fix the circumferential relative position of the main nut and the auxiliary nut.
The transmission device according to claim 5, wherein the first limiting part is at least one slot provided on the main nut, and the second limiting part is provided on the secondary nut At least one clamping seat, at least one clamping seat is used for inserting into at least one of the clamping grooves, so that the peripheral relative positions of the main nut and the auxiliary nut are fixed.
The transmission device according to claim 1, wherein an opening is provided on the adjustment part, and the adjustment part is used for radial contraction by narrowing the opening under the extrusion of the pressing assembly;

The number of the openings is at least two, and the at least two openings are evenly distributed in the circumferential direction of the drive nut.
The transmission device according to claim 1, wherein the adjustment part is arranged at the first end of the transmission nut, and the second end of the transmission nut opposite to the first end is provided with a fixing part , two ends of the pressing component are respectively connected to the adjusting part and the fixing part.
A printer, characterized by comprising the transmission device described in any one of claims 1-8 above.
The printer according to claim 9, further comprising:

Base, Z-axis guide assembly, cantilever, motor, screw rod; the Z-axis guide assembly is connected to the base, the motor is arranged in the base, the screw rod is connected to the motor, and the transmission device It is connected with the cantilever, and the transmission device is screwed to the screw rod; the motor is used to drive the screw rod to rotate, and the screw rod pushes the transmission device to drive the cantilever along the The Z-axis guide assembly goes up or down.