Printer with top cover convenient to disassemble and assemble

Abstract

A printer with a top cover convenient to disassemble and assemble comprises a printer body and the top cover. A printing mechanism and a paper rolling mechanism are installed in the machine body, at least one movable opening is formed in the machine body, and a rotating shaft is installed in the movable opening. At least one connecting arm is arranged on the top cover, a semicircular shaft sleeve with a notch is arranged on the connecting arm, the connecting arm is located in the movable opening, and the shaft sleeve is rotationally connected with the rotating shaft and is in transition fit with the rotating shaft; the interior of the machine body can be opened or closed by rotating the top cover around the rotating shaft, and the rotating shaft can be driven to enter and exit from the shaft sleeve through the notch by moving the top cover and overcoming the acting force between the shaft sleeve and the rotating shaft, so that the top cover is disassembled and assembled. Compared with the prior art, the scheme has the advantages that the semicircular shaft sleeve is designed on the top cover to be matched with the rotating shaft on the machine body for use, so that the top cover is simpler and more convenient to disassemble and assemble on the premise of ensuring that the top cover can be turned over normally, and the top cover can be suitable for various use scenes.

Description

Technical Field

[0001] The utility model belongs to the technical field of printing devices, and particularly relates to a printer with a top cover that is convenient to disassemble and assemble. Background Art

[0002] A printer is one of the output devices of a computer, and it can quickly convert information, pictures, etc. in the computer into a paper form. A traditional printer consists of a machine body and a top cover. A paper feeding mechanism for placing a paper roll and conveying paper is arranged inside the machine body, and a printing mechanism for printing dyes on the paper is also arranged inside the machine body. The top cover is installed on the machine body and is used to open and close the inside of the machine body to facilitate the user to replace the paper roll consumables on the paper feeding mechanism or maintain the printing mechanism.

[0003] In normal use scenarios, for example, when using a printer in an office, the paper consumption speed is relatively slow, and the user does not need to frequently open the top cover to replace the paper roll consumables. However, in some special use scenarios, for example, when using a printer in a factory, the paper consumption speed is extremely fast, and the user often needs to frequently open and close the top cover to replace the paper roll consumables. This process is not only time-consuming and laborious, but also easily causes damage to the top cover and the machine body. Therefore, users generally choose to remove the top shell before using the printer.

[0004] Since only normal use scenarios are considered in the prior art, the top cover and the bottom shell are mostly installed in a hinged manner. Although this installation method makes the connection between the top cover and the bottom shell stable, it also causes the user to need to use tools to complete the disassembly and assembly of the top cover. The inconvenience of disassembling and assembling the top cover will bring great trouble to users who need to use the printer in special scenarios. Therefore, it is very important to make the top cover easier to disassemble and assemble on the premise of ensuring that the top cover can be normally flipped. Content of the Utility Model

[0005] Technical Problem to be Solved

[0006] The utility model provides a printer with a top cover that is convenient to disassemble and assemble. On the premise of ensuring that the top cover can be normally flipped, the disassembly and assembly of the top cover are made more convenient, so it can be applied to a variety of use scenarios.

[0007] Technical Solution

[0008] To achieve the above object, the utility model provides the following technical solution:

[0009] A printer with a top cover that is convenient to disassemble and assemble, including a machine body and a top cover; a printing mechanism and a paper roll mechanism are installed inside the machine body, and at least one movable opening is formed on the machine body, and a rotating shaft is installed in the movable opening; at least one connecting arm is provided on the top cover, a semi-circular shaft sleeve with a notch is provided on the connecting arm, the connecting arm is located in the movable opening, and the shaft sleeve is rotatably connected with the rotating shaft and has a clearance fit.

[0010] Among them, rotating the top cover around the rotating shaft can open or close the interior of the body. Moving the top cover and overcoming the acting force between the shaft sleeve and the rotating shaft can drive the rotating shaft to enter and exit the shaft sleeve through the notch, realizing the disassembly and assembly of the top cover. Therefore, the combined use of the shaft sleeve and the rotating shaft enables the top cover to normally flip and open / close the interior of the body on the one hand, facilitating the replacement of the paper roll consumables on the paper feeding mechanism or the maintenance of the printing mechanism. On the other hand, it makes the disassembly and assembly of the top cover more convenient, and the top cover can be easily disassembled and assembled without the aid of tools. Thus, this printer can be applied to various usage scenarios, improving the overall usage experience.

[0011] Preferably, the cross-section of the rotating shaft is an irregular circular surface. The diameter of the irregular circular surface in a specific direction is α, and the diameter in other directions is β. The cross-section of the shaft sleeve is a regular semi-circular surface, and the diameter of the regular semi-circular surface is d, where α < d ≤ β. Among them, flipping the top cover so that the notch of the shaft sleeve rotates to the specific direction of the irregular circular surface and moving the top cover along the current direction can perform the disassembly and assembly.

[0012] Preferably, the diameter of the irregular circular surface in the 45° direction is α, and the diameters in the vertical and horizontal directions are β. Among them, flipping the top cover so that the notch of the shaft sleeve rotates to the 45° direction of the irregular circular surface and moving the top cover along the current direction can perform the disassembly and assembly.

[0013] Preferably, when the top cover closes the interior of the body, it is in a horizontal position, and the notch of the shaft sleeve is in the vertical direction of the irregular circular surface. After the top cover rotates 90°, the notch of the shaft sleeve is in the horizontal direction of the irregular circular surface, and the connecting arm abuts against the bottom wall of the movable opening.

[0014] Preferably, it further includes a locking part. When the top cover closes the interior of the body, the locking part can lock the top cover to the body.

[0015] Preferably, the locking part includes a buckle and a bayonet. The buckle is arranged on the top cover, and the bayonet is arranged on the body, and the buckle can be snapped into or disengaged from the bayonet.

[0016] Preferably, a receiving port is opened on the top cover. The buckle includes a pressing block and a clamping head. The pressing block is movably installed in the receiving port, and the clamping head is integrally formed with the pressing block and is located outside the receiving port. A slot is opened on the body, and the slot communicates with the outside and the bayonet. Among them, the clamping head can be inserted into the slot and snapped into the bayonet, and pressing the pressing block can drive the clamping head to disengage from the bayonet.

[0017] Preferably, anti-slip patterns are provided on the outer wall of the briquette.

[0018] Preferably, there are two movable openings, both of which are located on one side of the body, and there are two connecting arms, both of which are located on one side of the top cover. The bushings on the two connecting arms are designed corresponding to the rotating shafts in the two movable openings one by one.

[0019] Preferably, a paper outlet corresponding to the printing mechanism is provided on the body, and an insertion block with a sawtooth rack is provided on the top cover. When the top cover closes the inside of the body, the insertion block encloses the paper outlet so that the sawtooth rack can cut the printed paper.

[0020] Beneficial effects

[0021] A printer with a top cover that is convenient for disassembly and assembly provided by the present utility model, by designing a semi-circular bushing on the top cover to cooperate with the rotating shaft on the body, on the one hand, enables the top cover to normally flip open and close the inside of the body, facilitating the replacement of the paper roll consumables on the paper feeding mechanism or the maintenance of the printing mechanism, and on the other hand, makes the disassembly and assembly of the top cover more convenient, and the top cover can be easily disassembled and assembled without the aid of tools. Therefore, this printer can be applied to a variety of usage scenarios, improving the overall usage experience. Description of the drawings

[0022] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0023] Figure 1 Shows the schematic diagram of the usage state of the present utility model Figure 1 ;

[0024] Figure 2 Shows Figure 1 The top view of

[0025] Figure 3 Shows Figure 2 The sectional view A-A of

[0026] Figure 4 Shows Figure 4 The enlarged view of part A in

[0027] Figure 5 Shows Figure 2 The sectional view B-B of

[0028] Figure 6 Shows Figure 5 The enlarged view of part B in

[0029] Figure 7 Shows the schematic diagram of the usage state of the present utility model Figure 2 ;

[0030] Figure 8 shows a Figure 7 cross-sectional view;

[0031] Figure 9 shows a Figure 8 magnified view at position C in

[0032] Figure 10 schematic diagram of the usage state of the present utility model Figure 3 ;

[0033] Figure 11 shows a Figure 10 exploded schematic diagram of

[0034] Figure 12 shows a Figure 11 magnified view at position D in

[0035] Figure 13 shows a Figure 11 cross-sectional view;

[0036] Figure 14 shows a Figure 13 magnified view at position E in

[0037] Figure 15 structural schematic diagram of the top cover of the present utility model;

[0038] Figure 16 shows a Figure 15 magnified view at position F in

[0039] In the figure: 1 body, 10 movable opening, 100 rotating shaft, 11 printing mechanism, 12 paper roll mechanism, 13 slot, 14 paper outlet, 2 top cover, 20 connecting arm, 200 bushing, 201 notch, accommodation opening 21, 22 insertion block, 23 sawtooth rack, 3 locking part, 31 buckle, 311 pressing block, 3110 anti-slip pattern, 312 clamping head, 32 clamping opening. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present application. The connection relationships shown in the drawings are only for clear description and do not limit the connection methods.

[0041] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component present at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. It should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "joined" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. The terms used in the description of this application in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] It should also be noted that in the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] Refer to the attached Figure 1 - attached Figure 14 , a printer facilitating the disassembly and assembly of the top cover, including a machine body 1 and a top cover 2; a printing mechanism 11 and a paper feeding mechanism 12 are installed inside the machine body 1, and at least one movable opening 10 is provided on the machine body 1, and a rotating shaft 100 is installed in the movable opening 10; at least one connecting arm 20 is provided on the top cover 2, and a semi-circular bushing 200 with a notch 201 is provided on the connecting arm 20. The connecting arm 20 is located in the movable opening 10, and the bushing 200 is rotatably connected to the rotating shaft 100 and has a transition fit.

[0044] Specifically, as shown in the attached Figure 1 - attached Figure 9 As shown in the figure, when using the printer in a conventional usage scenario such as an office, the user can rotate the top cover 2 around the rotating shaft 100 to normally open or close the inside of the machine body 1, and then replace the paper roll consumables on the paper feeding mechanism or maintain the printing mechanism 11.

[0045] As shown in the attached Figure 10 - attached Figure 14As shown in the figure, when using the printer in special usage scenarios such as factories, first rotate the top cover 2 to open the inside of the machine body 1, and then apply a certain pulling force to the top cover 2 to overcome the acting force between the bushing 200 and the rotating shaft 100, then the rotating shaft 100 can be driven to enter and exit the bushing 200 through the notch 201, realizing the disassembly of the top cover 2; similarly, when installing the top cover 2, first align the notch 201 with the rotating shaft 100, and then push the top cover 2 forcefully to drive the bushing 200 to sleeve the rotating shaft 100, and make the connecting arm 20 placed in the movable port 10.

[0046] Among them, the design of the notch 201 enables the bushing 200 to have a certain expansion ability, and the bushing 200 is generally made of materials with a certain recovery ability such as plastic and metal. Therefore, during the process of the bushing 200 entering and exiting the rotating shaft 100, the bushing 200 will undergo adaptive deformation to ensure that the bushing 200 can always be stably connected and matched with the rotating shaft 100.

[0047] In summary, the present utility model designs a semi-circular bushing 200 on the top cover 2 to cooperate with the rotating shaft 100 on the machine body 1. On the one hand, it enables the top cover 2 to normally flip and open the inside of the machine body 1, facilitating the replacement of the paper roll consumables on the paper feeding mechanism or the maintenance of the printing mechanism 11. On the other hand, it makes the disassembly and assembly of the top cover 2 more convenient, and the top cover 2 can be easily disassembled and assembled without tools. Therefore, this printer can be applicable to a variety of usage scenarios, improving the overall usage experience.

[0048] It should be noted that there are various types of printers, such as thermal transfer printers, thermal printer, etc. Correspondingly, the machine body 1 can also be selected according to the corresponding type of printer. This is not restricted in the present utility model. For the convenience of understanding, the thermal transfer printer is taken as an example in the present utility model.

[0049] Refer to the attached Figure 10 - attached Figure 14 Considering that if only rely on brute force to pull the top cover 2 to drive the bushing 200 to disengage or sleeve the rotating shaft 100, after long-term use, there may be certain damage between the bushing 200 and the rotating shaft 100 due to repeated friction, and the bushing 200 itself is also prone to losing the recovery ability due to excessive expansion, which will cause the bushing 200 and the rotating shaft 100 to no longer be stably matched. To solve this problem, in the present utility model, the cross-section of the rotating shaft 100 is an irregular circular surface, the diameter of the irregular circular surface in a specific direction is α, and the diameter in other directions is β; the cross-section of the bushing 200 is a regular semi-circular surface, and the diameter of the regular semi-circular surface is d, where α < d ≤ β.

[0050] Specifically, under normal circumstances, the user can rotate the top cover 2 around the axis of the rotating shaft 100 to open and close the interior of the body 1. Since d ≤ β, without applying a large force to the top cover 2, the bushing 200 cannot be separated from the rotating shaft 100 normally, that is, the top cover 2 will not easily separate from the body 1 during the flipping process.

[0051] When disassembling the top cover 2, first flip the top cover 2 so that the notch 201 of the bushing 200 rotates to a specific direction on the non-regular circular surface, and then move the top cover 2 along the current direction. Since α < d, the rotating shaft 100 can easily pass through the notch 201 and separate from the bushing 200 to remove the top cover 2 from the body 1; similarly, when installing the top cover 2, first adjust the position of the top cover 2 so that the notch 201 is located in a specific direction on the non-regular circular surface, and then move the top cover 2 along the current direction so that the rotating shaft 100 can easily pass through the notch 201 and be sleeved with the bushing 200.

[0052] Therefore, the above structure relies on the dimensional fit relationship between the rotating shaft 100 and the bushing 200, so that after the bushing 200 rotates to a specific position, it still needs to move along a specific direction to facilitate the smooth removal of the top cover 2. This design is very ingenious. It can not only prevent the top cover 2 from easily separating from the body 1 during the flipping process, ensuring the structural stability, but also facilitate the user to easily disassemble and assemble the top cover 2, improving the usability; at the same time, it can also reduce the possibility of damage to the rotating shaft 100 and the bushing 200, extending the service life of the relevant structure.

[0053] Refer to the appendix Figure 10 - appendix Figure 14 Based on the above content, it can be seen that the top cover 2 has specific installation and disassembly positions. In order to make the installation and disassembly positions of the top cover 2 more reasonable, in the present utility model, the diameter of the non-regular circular surface in the 45° direction is α, and the diameters in the vertical and horizontal directions are β; among them, flipping the top cover 2 so that the notch 201 of the bushing 200 rotates to the 45° direction of the non-regular circular surface and moving the top cover 2 along the current direction can perform the installation and disassembly.

[0054] Specifically, when flipping the top cover 2 so that the notch 201 of the bushing 200 rotates to the 45° direction of the non-regular circular surface, the top cover 2 is generally in a semi-open state. At this time, it is more convenient for the user to move the top cover 2 along the current direction, which conforms to the operation habits of ordinary people and improves the operation convenience.

[0055] Refer to the appendix Figure 10 - appendix Figure 14, the irregular circular surface actually has positions in four 45° directions, which enables the bushing 200 to disengage from the rotating shaft 100 in the upper left, lower left, upper right, and lower right directions of the rotating shaft 100, causing trouble to users. To enable the bushing 200 to disengage from the rotating shaft 100 only in one direction, corresponding structures need to be restricted. For this purpose, in the present utility model, when the top cover 2 closes the inside of the body 1, it is in a horizontal position, and the notch 201 of the bushing 200 is located in the vertical direction of the irregular circular surface. After the top cover 2 rotates 90°, the notch 201 of the bushing 200 is located in the horizontal direction of the irregular circular surface, and the connecting arm 20 abuts against the bottom wall of the movable port 10.

[0056] Specifically, under the restriction of the body 1 and the movable port 10, the upper left, lower left, and lower right directions of the rotating shaft 100 are all covered, enabling the top cover 2 to have a 90° rotation range, that is, the top cover 2 can only move in the upper right direction to enable the bushing 200 to disengage from the rotating shaft 100. Also, because when the notch 201 of the bushing 200 is in the upper right direction, the top cover 2 has a downward movement tendency under its own gravity, so if no reverse acting force is applied to the top cover 2, it is difficult for the bushing 200 to disengage from the rotating shaft 100.

[0057] Therefore, the above design can not only enable the bushing 200 to disengage from the rotating shaft 100 only in one direction, improving the operation convenience, but also reduce the risk of the top cover 2 falling off the body 1 by itself, improving the use stability.

[0058] It should be noted that the restrictions such as "upper left", "lower left", "upper right", and "lower right" in the above embodiments are only described for the convenience of review and understanding. In fact, those skilled in the art can also select other directions of the bushing 200 for the bushing 200 to move and disengage according to needs, and the present utility model does not limit this.

[0059] Refer to the attached Figure 1 - attached Figure 4 and attached Figure 7 - attached Figure 10 , when the printer is working, it will generate slight vibrations. Under the influence of the vibration force, the top cover 2 may continuously knock against the body 1. To solve this problem, the present utility model also includes a locking part 3. When the top cover 2 closes the inside of the body 1, the locking part 3 can lock the top cover 2 to the body 1, thereby avoiding the top cover 2 knocking against the body 1 due to the influence of the vibration force.

[0060] Refer to the attached Figure 1 - attached Figure 4 and attached Figure 10 - attached Figure 16The existing locking portion 3 includes a snap-on structure, a magnetic structure, a Velcro adhesive structure, etc. Due to the variety of related structures, the present utility model does not limit this. For the convenience of understanding, the locking portion 3 in this embodiment includes a buckle 31 and a bayonet 32. The buckle 31 is arranged on the top cover 2, and the bayonet 32 ​​is arranged on the body 1, and the buckle 31 cooperates with the bayonet 32.

[0061] Specifically, when the top cover 2 closes the inside of the body 1 , the buckle 31 engages with the bayonet 32 ​​to lock the top cover 2 onto the body 1 , and the user can release the restriction by driving the buckle 31 out of the bayonet 32 ​​, and then the top cover 2 can be flipped over to open the inside of the body 1 .

[0062] Furthermore, a receiving opening 21 is provided on the top cover 2, and the buckle 31 includes a pressure block 311 and a clamping head 312. The pressure block 311 can be movably installed in the receiving opening 21, and the clamping head 312 is integrally formed with the pressure block 311 and is located outside the receiving opening 21; a slot 13 is provided on the body 1, and the slot 13 connects the outside world and the clamping opening 32; wherein, pressing the pressure block 311 can drive the clamping head 312 to disengage from the clamping opening 32.

[0063] Specifically, when the top cover 2 closes the inside of the body 1, the clamping head 312 is inserted into the slot 13 and engages with the slot 32 to lock the top cover 2 on the body 1; and when the user presses the pressure block 311 to drive the clamping head 312 to disengage from the slot 32 to release the restriction, the top cover 2 can be flipped over to open the inside of the body 1; and when the user flips the top cover 2 over again to close the inside of the body 1, the clamping head 312 is squeezed by the inner wall of the slot 13 and drives the pressure block 311 to adaptively deform in the accommodating opening 21, until the top cover 2 is completely attached to the body 1, the pressure block 311 returns to its original state and drives the clamping head 312 to engage with the slot 32.

[0064] See attached Figure 15 -Attached Figure 16 The outer wall of the pressing block 311 is provided with anti-slip grooves 3110. The design of the anti-slip grooves 3110 can increase the friction between the pressing block 311 and the fingers. On the one hand, it is convenient for the customer to press the pressing block 311 to drive the clamping head 312 out of the clamping port 32. On the other hand, it can serve as a fulcrum for the user to apply pressure to flip the top cover 2.

[0065] See attached Figure 1 -Attached Figure 11, there are two movable ports 10, both of which are located on one side of the body 1, and there are two connecting arms 20, both of which are located on one side of the top cover 2. The bushings 200 on the two connecting arms 20 are designed corresponding to the rotating shafts 100 in the two movable ports 10 one by one. This structural design can improve the supporting force of the body 1 on the top cover 2, make the two points on one side of the top cover 2 receive uniform force, and further ensure that the top cover 2 can rotate relative to the body 1 more stably. At the same time, the cooperation of the two bushings 200 and the two rotating shafts 100 can also make the connection between the top cover 2 and the body 1 more stable, reducing the possibility of the top cover 2 detaching from the body 1 during the rotation process.

[0066] Refer to the appendix Figure 1 - appendix Figure 7 and appendix Figure 15 - appendix Figure 16 , a paper outlet 14 corresponding to the printing mechanism 11 is provided on the body 1, and a plug 22 with a sawtooth rack 23 is provided on the top cover 2. When the top cover 2 closes the inside of the body 1, the plug 22 encloses the paper outlet 14 so that the sawtooth rack 23 can cut the printed paper.

[0067] Specifically, the paper printed by the printing mechanism 11 is moved out of the outside world from the paper outlet 14. At this time, the user grabs the paper located outside and pulls it upward to make it contact the sawtooth rack 23 to complete the cutting. In conventional use scenarios such as offices, the top cover 2 closes the inside of the body 1 for a long time. This structural design is convenient for users to cut the paper and improves the usability. In special use scenarios such as factories, the top cover 2 is removed, so it does not have the corresponding paper cutting function.

[0068] It should also be noted that although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application.

Claims

1. A printer with a top cover that is easy to disassemble and assemble, characterized in that: include: A machine body (1), wherein a printing mechanism (11) and a paper rolling mechanism (12) are installed inside the machine body (1), and at least one movable opening (10) is provided on the machine body (1), and a rotating shaft (100) is installed inside the movable opening (10); A top cover (2), wherein at least one connecting arm (20) is provided on the top cover (2), and a semicircular shaft sleeve (200) having a notch (201) is provided on the connecting arm (20), the connecting arm (20) is located in the movable opening (10), and the shaft sleeve (200) is rotatably connected to and transitionally matched with the rotating shaft (100); The top cover (2) is rotated around the rotating shaft (100) to open or close the interior of the machine body (1), and the top cover (2) is moved to overcome the action force between the shaft sleeve (200) and the rotating shaft (100), so that the rotating shaft (100) can be driven to enter and exit the shaft sleeve (200) through the notch (201), thereby realizing the disassembly and assembly of the top cover (2).

2. A printer with an easily detachable top cover according to claim 1, characterized in that: The cross section of the rotating shaft (100) is an irregular circular surface, the diameter of the irregular circular surface in a specific direction is α, and the diameter in other directions is β; the cross section of the shaft sleeve (200) is a regular semicircular surface, the diameter of the regular semicircular surface is d, α<d≤β; wherein the top cover (2) is turned over so that the notch (201) of the shaft sleeve (200) is rotated to the specific direction of the irregular circular surface, and the top cover (2) is moved along the current direction for assembly and disassembly.

3. A printer with an easily detachable top cover according to claim 2, characterized in that: The diameter of the irregular circular surface in the 45° direction is α, and the diameter in the vertical and horizontal directions is β; wherein the top cover (2) is flipped so that the notch (201) of the shaft sleeve (200) is rotated to the 45° direction of the irregular circular surface, and the top cover (2) is moved in the current direction for installation and removal.

4. A printer with an easily detachable top cover according to claim 3, characterized in that: When the top cover (2) closes the interior of the machine body (1), it is in a horizontal position, and the notch (201) of the sleeve (200) is located in the vertical direction of the irregular circular surface; after the top cover (2) is rotated 90 degrees, the notch (201) of the sleeve (200) is located in the horizontal direction of the irregular circular surface, and the connecting arm (20) abuts against the bottom wall of the movable opening (10).

5. A printer with an easily detachable top cover according to claim 1, characterized in that: It also comprises a locking portion (3), and when the top cover (2) closes the interior of the machine body (1), the locking portion (3) can lock the top cover (2) onto the machine body (1).

6. A printer with an easily detachable top cover according to claim 5, characterized in that: The locking portion (3) comprises a buckle (31) and a bayonet (32); the buckle (31) is arranged on the top cover (2), and the bayonet (32) is arranged on the machine body (1); and the buckle (31) can be engaged with or disengaged from the bayonet (32).

7. A printer with an easily detachable top cover according to claim 6, characterized in that: The top cover (2) is provided with a receiving opening (21), the buckle (31) comprises a pressing block (311) and a clamping head (312), the pressing block (311) is movably mounted in the receiving opening (21), and the clamping head (312) is integrally formed with the pressing block (311) and is located outside the receiving opening (21); a slot (13) is provided on the body (1), the slot (13) is connected to the outside and the clamping opening (32); the clamping head (312) can be inserted into the slot (13) and clamped to the clamping opening (32), and the pressing block (311) can be pressed to drive the clamping head (312) to detach from the clamping opening (32).

8. A printer with an easily detachable top cover according to claim 7, characterized in that: Anti-slip grooves (3110) are provided on the outer wall of the pressing block (311).

9. A printer with an easily detachable top cover according to any one of claims 1 to 8, characterized in that: The movable openings (10) are provided with two and are both located on one side of the machine body (1); the connecting arms (20) are provided with two and are both located on one side of the top cover (2); and the shaft sleeves (200) on the two connecting arms (20) are designed to correspond one to one to the rotating shafts (100) in the two movable openings (10).

10. A printer with an easily detachable top cover according to claim 9, characterized in that: The machine body (1) is provided with a paper outlet (14) corresponding to the printing mechanism (11), and the top cover (2) is provided with an insert block (22) having a sawtooth bar (23); when the top cover (2) closes the inside of the machine body (1), the insert block (22) encloses the paper outlet (14) so ​​that the sawtooth bar (23) can cut the printed paper.

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