Cover opening structure and printer

Abstract

The utility model discloses a cover opening structure and a printer. The cover opening structure comprises a lower shell, an upper shell, a support and an elastic piece. The lower shell is provided with a containing cavity with an opening in one side; the upper shell is rotationally mounted on the lower shell, is located at the opening and can open and close the opening during rotation, and a receding opening communicated with the containing cavity is formed in the rotating end of the upper shell; the support is provided with a seat body and an installation arm which are connected, the seat body is detachably installed on the lower shell and located in the containing cavity, and the installation arm extends out of the containing cavity from the receding opening; and the elastic piece is provided with two elastic arms which are respectively pressed against the mounting arm and the rotating end and is used for driving the upper shell to open the opening. According to the scheme, the mounting arm of the support extends out of the containing cavity from the receding opening, so that an assembler can press the two elastic arms of the elastic piece to the mounting arm outside the containing cavity and the rotating end respectively, the assembling convenience is improved, and the compactness of the overall structure is improved; and moreover, the adverse effect of difficulty or non-uniformity in cover closing caused by serious abrasion of the elastic piece to the shell is weakened, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printer opening, and particularly relates to an opening structure and a printer. Background Art

[0002] A label printer is a device that prints various image information such as barcodes, two-dimensional codes, graphics, and text on labels by using thermal or thermal transfer printing methods. Currently, most label printers on the market directly fix a torsion spring to the upper and lower shells of the machine case by a shaft.

[0003] For example, Patent CN 211764285 U discloses a thermal printer with an opening torsion spring. Its flip cover (upper shell) is rotatably connected to the middle frame (lower shell) through a rotating shaft, and a support plate is arranged on the flip cover. A channel is correspondingly arranged on the installation table in the middle frame for the support plate, and then the torsion spring is sleeved on the rotating shaft. At the same time, one end of the torsion spring is hooked on the support plate, and the other end is placed in the channel of the installation table, so that the torsion spring will be relatively fixed after multiple uses, not easily deformed, and will not shift.

[0004] However, the torsion spring in this patent is arranged in the inner cavity of the lower shell, which has the problem of relatively inconvenient assembly for small-sized printers. At the same time, one end of the torsion spring directly presses against the channel of the installation table. After long-term use, the channel of the installation table is easily worn and deformed, resulting in difficulties in closing the cover and uneven gaps after closing the cover. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies and propose an opening structure to solve the technical problem that the torsion spring in the prior art is arranged in the inner cavity of the lower shell, which is relatively inconvenient for assembly of small-sized printers.

[0006] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides an opening structure, including:

[0008] A lower shell having a cavity with one side open;

[0009] An upper shell rotatably installed on the lower shell, located at the opening, and capable of opening and closing the opening when rotating. An avoidance opening communicating with the cavity is provided at its rotating end;

[0010] A bracket having a connected seat body and an installation arm. The seat body is detachably installed on the lower shell and located in the cavity, and the installation arm extends out of the cavity from the avoidance opening; and

[0011] The elastic member has two elastic arms respectively pressing against the mounting arm and the rotating end, and is used to drive the upper shell to reset to the position where the opening is opened.

[0012] In some embodiments, a shaft hole is provided along the axial direction of the rotating end. The opening cover structure further includes a rotating shaft, which is installed on the mounting arm, passes through the shaft hole, and the end close to the mounting arm extends out of the shaft hole;

[0013] The elastic member further includes a spiral spring connected between the two elastic arms. One of the two elastic arms is a short force arm, and the other is a long force arm. The short force arm presses against the mounting arm. The spiral spring is sleeved on the end of the rotating shaft outside the shaft hole, and the long force arm presses against the rotating end.

[0014] In some embodiments, a clamping groove is provided on the rotating end. The clamping groove and the shaft hole are arranged at intervals along the radial direction thereof, and the side away from the shaft hole is open;

[0015] The long force arm includes an extension section and a pressing section connected to each other. The extension section is connected to the spiral spring. The pressing section is connected to the extension section at an angle and is arranged in the clamping groove.

[0016] In some embodiments, there are two relief openings. The two relief openings are located on both sides of the shaft hole in the axial direction of the shaft hole and are arranged at intervals with the shaft hole to form an installation gap. The mounting arm is provided with two corresponding to the relief openings. The two ends of the rotating shaft respectively extend out of the shaft hole and are installed on the two mounting arms;

[0017] There are two sets of elastic members. The spiral springs of the two sets are respectively sleeved on the two ends of the rotating shaft and are located in the corresponding installation gaps. The short force arms of the two sets respectively press against the two mounting arms, and the pressing sections of the two sets are both arranged in the clamping groove and are integrally connected.

[0018] In some embodiments, the mounting arm is provided with a mounting groove for placing the short force arm; and / or,

[0019] The mounting arm is provided with a through hole along the axial direction of the rotating shaft. The rotating shaft is rotatably arranged in the through hole. The opening cover structure further includes a baffle plate, which is placed on the side of one mounting arm away from the shaft hole for blocking the rotating shaft.

[0020] In some embodiments, the upper shell includes an upper inner shell and an upper cover along the direction away from the lower shell. The upper inner shell and the upper cover are detachably connected and jointly enclose an installation cavity;

[0021] The rotating end is located in the upper inner shell and is placed in the installation cavity. The relief opening communicates the accommodation cavity and the installation cavity.

[0022] In some embodiments, the upper inner shell is provided with connecting holes, the upper cover is provided with mounting screw holes corresponding to the connecting holes, and the upper shell further includes mounting bolts that pass through the connecting holes and are screwed into the mounting screw holes; and / or,

[0023] A positioning groove is provided on the inner side of the upper cover, and a positioning protrusion is provided on the upper inner shell corresponding to the positioning groove. The positioning protrusion can be clamped in the positioning groove.

[0024] In some embodiments, the rotating end is provided with a wire passing groove that extends along the axial direction of the rotating end.

[0025] In some embodiments, the seat body is provided with a mating hole, the lower shell is provided with a fixing screw hole corresponding to the mating hole, and the open cover structure further includes a fixing bolt that passes through the mating hole and is screwed into the fixing screw hole; and / or,

[0026] The seat body is provided with a limiting groove, and the lower shell is provided with a limiting protrusion corresponding to the limiting groove. The limiting protrusion can be clamped in the limiting groove.

[0027] In a second aspect, the present utility model further provides a printer, including the open cover structure described in any one of the above.

[0028] Compared with the prior art, in the open cover structure provided by the present utility model, the mounting arm of the bracket extends out of the cavity from the avoidance opening, so that the assembly personnel can respectively press the two elastic arms of the elastic member against the mounting arm and the rotating end outside the cavity, improving the assembly convenience; at the same time, the seat body of the bracket is placed in the cavity, avoiding the seat body occupying additional external space and improving the compactness of the overall structure; in addition, the seat body is detachably connected to the lower shell, so that the seat body can be replaced when it is severely worn, reducing the adverse effects of difficult or uneven closing of the cover caused by severe wear of the elastic member on the casing, and improving the practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the open cover structure provided by an embodiment of the present utility model;

[0030] Figure 2 is Figure 1 a schematic diagram of the upper shell in

[0031] Figure 3 is Figure 1 a schematic diagram of the open cover structure in

[0032] Figure 4 is Figure 3 a partial schematic diagram of the open cover structure in

[0033] Figure 5 Yes Figure 4 Schematic diagram of the middle rotating shaft and two sets of elastic members;

[0034] Figure 6 Yes Figure 3 Partial schematic diagram of the upper inner shell;

[0035] Figure 7 Yes Figure 6 Partial schematic diagram of the upper inner shell from another angle;

[0036] Figure 8 Yes Figure 3 Schematic diagram of the middle bracket;

[0037] Figure 9 Yes Figure 2 Schematic diagram of the upper cover;

[0038] Figure 10 Yes Figure 3 Schematic diagram of the lower shell and the bracket;

[0039] Figure 11 Yes Figure 10 Partial schematic diagram of the middle bracket and the lower inner shell;

[0040] Figure 12 Yes Figure 11 Partial schematic diagram of the lower inner shell;

[0041] Figure 13 Yes Figure 1 Partial cross-sectional view of the middle cover opening structure.

[0042] Explanation of reference numerals:

[0043] 1. Lower shell; 1a. Cavity; 1b. Hollow cavity; 11. Lower inner shell; 11a. Fixed screw hole; 111. Limiting protrusion; 12. Bottom shell; 2. Upper shell; 2a. Installation cavity; 21. Rotating end; 21a. Avoidance opening; 21b. Shaft hole; 21c. Card slot; 21d. Installation gap; 21e. Wire groove; 22. Upper inner shell; 22a. Connection hole; 221. Positioning protrusion; 23. Upper cover; 23a. Installation screw hole; 23b. Positioning groove; 24. Installation bolt; 3. Bracket; 31. Seat body; 31a. Fitting hole; 31b. Limiting groove; 32. Installation arm; 32a. Installation groove; 32b. Through hole; 33. Fixed bolt; 4. Elastic member; 41. Elastic force arm; 42. Short force arm; 43. Long force arm; 431. Extension section; 432. Pressing section; 44. Helical spring; 5. Rotating shaft; 6. Baffle; 7. Cable. Detailed implementation manners

[0044] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0045] To solve the technical problem that in the prior art, the torsion spring is arranged in the inner cavity of the lower shell, which causes relatively inconvenient assembly for small-sized printers, the present utility model provides an opening structure that can respectively press two elastic arms of the elastic member against the mounting arm and the rotating end outside the cavity, improving the assembly convenience.

[0046] It should be noted that the opening structure described in the present utility model is applicable to but not limited to printers, etc. For the convenience of description, in the present utility model, only the case where the opening structure is applied to a printer is taken as an example for description, and the principle of the opening structure applied to other types of devices is essentially the same as that applied to a printer, and will not be elaborated herein one by one.

[0047] Please refer to Figures 1 to 4 , Figures 1 to 4 which is a schematic structural diagram of the opening structure in an embodiment of the present utility model. The opening structure includes a lower shell 1, an upper shell 2, a bracket 3 and an elastic member 4; the lower shell 1 has a cavity 1a with one side being open; the upper shell 2 is rotatably installed on the lower shell 1 and is located at the opening, and can open and close the opening when rotating, and a relief opening 21a communicating with the cavity 1a is provided at its rotating end 21; the bracket 3 has a seat body 31 and a mounting arm 32 connected to each other. The seat body 31 is detachably installed on the lower shell 1 and is located in the cavity 1a, and the mounting arm 32 extends out of the cavity 1a from the relief opening 21a; the elastic member 4 has two elastic arms 41 respectively pressing against the mounting arm 32 and the rotating end 21, and is used to drive the upper shell 2 to reset to the position of opening the above-mentioned opening.

[0048] In the opening structure provided by the present utility model, the mounting arm 32 of the bracket 3 is extended out of the cavity 1a from the relief opening 21a, so that the assembler can respectively press two elastic arms 41 of the elastic member 4 against the mounting arm 32 and the rotating end 21 outside the cavity 1a, improving the assembly convenience; at the same time, the seat body 31 of the bracket 3 is placed in the cavity 1a to avoid the seat body 31 additionally occupying external space and improving the compactness of the overall structure; in addition, the seat body 31 is detachably connected to the lower shell 1, so that the seat body 31 can be replaced when it is severely worn, reducing the adverse effect of difficult or uneven closing of the cover caused by the severe wear of the elastic member 4 on the casing and improving the practicability. It should be noted that in an embodiment, a pressing buckle is further provided at one end of the upper shell 2 opposite to the rotating end 21, and the pressing buckle is movably buckled on the lower shell 1 to be able to buckle and release from the lower shell 1. The specific structure and principle of the pressing buckle are prior art and will not be elaborated herein.

[0049] In one of the embodiments, please refer to Figures 5 to 7 , a shaft hole 21b is provided along the axial direction of the rotating end 21. The open-cover structure further includes a wrapping rotating shaft 5. The rotating shaft 5 is installed on the installation arm 32, passes through the shaft hole 21b, and one end close to the installation arm 32 extends out of the shaft hole 21b; the elastic member 4 further includes a spiral spring 44 connected between the two elastic arms 41. One of the two elastic arms 41 is a short force arm 42, and the other is a long force arm 43. The short force arm 42 presses against the installation arm 32. The spiral spring 44 is sleeved on one end of the rotating shaft 5 outside the shaft hole 21b, and the long force arm 43 presses against the rotating end 21.

[0050] In this embodiment, the elastic member 4 is arranged as a torsion spring composed of the short force arm 42, the spiral spring 44 and the long force arm 43, with a simple and reliable structure; and the spiral spring 44 is sleeved on the rotating shaft 5, and the short force arm 42 presses against the installation arm 32, and the long force arm 43 presses against the rotating section, so that the force of the torsion spring on the installation arm 32 is greater than that on the rotating section, thereby reducing the wear of the torsion spring on the upper shell 2, and the seat body 31 can be disassembled and replaced in time when the installation arm 32 is severely worn, further weakening the adverse effect caused by the wear of the torsion spring on the casing, and having better practicability. It should be noted that in this solution, the bracket 3 is made of metal material to improve its wear resistance.

[0051] In one of the embodiments, the rotating end 21 is provided with a card slot 21c. The card slot 21c and the shaft hole 21b are arranged at intervals along the radial direction thereof, and the side away from the shaft hole 21b is open; the long force arm 43 includes an extension section 431 and a pressing section 432 which are connected. The extension section 431 is connected to the spiral spring 44, the pressing section 432 is connected to the extension section 431 at an angle, and is arranged in the card slot 21c.

[0052] In this embodiment, the long force arm 43 is in the form of the extension section 431 and the pressing section 432 to extend the long force arm 43 as much as possible, and make the force on the rotating end 21 uniform, reducing the wear effect of the long force arm 43 on the rotating end 21; and the pressing section 432 is placed in the card slot 21c to improve the assembly convenience of the long force arm 43 and the rotating end 21.

[0053] In one of the embodiments, please refer to Figure 7 and Figure 8 , there are two avoidance openings 21a. The two avoidance openings 21a are located on both sides of the shaft hole 21b in the axial direction and are arranged at intervals from the shaft hole 21b to form an installation gap 21d. The installation arm 32 is provided with two corresponding to the avoidance openings 21a. The two ends of the rotating shaft 5 extend out of the shaft hole 21b respectively and are installed on the two installation arms 32; there are two groups of elastic members 4. The spiral springs 44 of the two groups are respectively sleeved on the two ends of the rotating shaft 5 and are located in the corresponding installation gaps 21d. The short force arms 42 of the two groups respectively press against the two installation arms 32, and the pressing sections 432 of the two groups are both arranged in the card slot 21c and are integrally connected.

[0054] In this embodiment, two sets of elastic members 4 are provided at both ends of the rotating shaft 5 and correspondingly press against the two mounting arms 32, so that the elastic members 4 can stably drive the upper shell 2 to reset to the position of opening the above-mentioned opening. And the pressing sections 432 of the two sets are integrally connected, so that the two sets of elastic members 4 form a whole, improving the assembly convenience.

[0055] In one embodiment, the mounting arm 32 is provided with a mounting groove 32a for placing the short force arm 42; the mounting arm 32 is provided with a through hole 32b along the axial direction of the rotating shaft 5, the rotating shaft 5 is rotatably arranged in the through hole 32b, and the opening structure further includes a baffle 6, and the baffle 6 is placed on one side of a mounting arm 32 away from the shaft hole 21b for blocking the rotating shaft 5.

[0056] In this embodiment, the short force arm 42 is placed in the mounting groove 32a of the mounting arm 32 to prevent the short force arm 42 from running off the mounting arm 32 and facilitate installation. At the same time, when installing the rotating shaft 5, one end of the rotating shaft 5 is sequentially passed through the shaft hole 21b and the through hole 32b, and the installation is completed when the rotating shaft 5 is blocked by the baffle 6, improving the installation convenience of the rotating shaft 5. At the same time, the friction force between the spiral spring 44 and the rotating shaft 5 can be used to limit the running-off of the rotating shaft 5.

[0057] In one embodiment, please refer to Figure 2 、 Figure 6 and Figure 9 , the upper shell 2 includes an upper inner shell 22 and an upper cover 23 along the direction away from the lower shell 1. The upper inner shell 22 and the upper cover 23 are detachably connected and jointly enclose an installation cavity 2a; the rotating end 21 is located in the upper inner shell 22 and is placed in the installation cavity 2a, and the avoidance opening 21a communicates with the accommodation cavity 1a and the installation cavity 2a.

[0058] In this embodiment, the upper shell 2 is set in the form of an upper inner shell 22 and an upper cover 23, and the elastic member 4 and the rotating end 21 are arranged on the upper inner shell 22 and correspondingly placed in the installation cavity 2a to form a hidden installation, improving the aesthetics and avoiding interference from external foreign objects at the same time. It should be noted that in this solution, the installation cavity 2a can also accommodate the circuit board and components corresponding to the start switch.

[0059] In one embodiment, the upper inner shell 22 is provided with a connection hole 22a, the upper cover 23 is provided with a mounting screw hole 23a corresponding to the connection hole 22a, and the upper shell 2 further includes a mounting bolt 24. The mounting bolt 24 passes through the connection hole 22a and is screwed into the mounting screw hole 23a; a positioning groove 23b is provided on the inner side of the upper cover 23, and a positioning protrusion 221 is provided on the upper inner shell 22 corresponding to the positioning groove 23b, and the positioning protrusion 221 can be clamped in the positioning groove 23b.

[0060] In this embodiment, the detachable connection between the upper inner shell 22 and the upper cover 23 is realized through the mounting bolts 24, and the structure is stable and reliable. And through the cooperation of the positioning protrusion 221 and the positioning groove 23b, it is convenient for the connection hole 22a and the mounting bolt 24 to be centered, improving the assembly convenience.

[0061] In one embodiment, the rotating end 21 is provided with a wire passing groove 21e, and the wire passing groove 21e extends along the axial direction of the rotating end 21.

[0062] In this embodiment, the cable 7 on the other side can be converged to the same side of the casing through the wire passing groove 21e, and the cable 7 is in the form of a stranded wire. At the place where the cable 7 passes through the above-mentioned wire passing groove 21e, acetic acid adhesive tape is wound to avoid abrasion, and at the same time, the cost of the cable 7 and the stress in the cable 7 can be effectively reduced.

[0063] In one embodiment, please refer to Figures 10 to 12 , the seat body 31 is provided with a mating hole 31a, the lower shell 1 is provided with a fixing screw hole 11a corresponding to the mating hole 31a, and the open cover structure further includes a fixing bolt 33. The fixing bolt 33 passes through the mating hole 31a and is screwed into the fixing screw hole 11a; the seat body 31 is provided with a limiting groove 31b, and the lower shell 1 is provided with a limiting protrusion 111 corresponding to the limiting groove 31b. The limiting protrusion 111 can be clamped in the limiting groove 31b.

[0064] In this embodiment, the detachable connection between the seat body 31 and the lower shell 1 is realized in the form of a fixing bolt 33, and the structure is simple and reliable. And through the cooperation of the limiting groove 31b and the limiting protrusion 111, the centering of the mating hole 31a and the fixing screw hole 11a is realized, improving the assembly convenience.

[0065] It should be noted that, in one embodiment, please refer to Figure 10 and Figure 13 , the lower shell 1 is arranged as the lower inner shell 11 and the bottom shell 12 in the direction away from the upper shell 2. The cavity 1a is formed in the lower inner shell 11, and a cavity 1b is formed between the lower inner shell 11 and the bottom shell 12. The cavity 1b is provided with a communication port communicating with the outside and corresponding to the rotating end 21. The seat body 31 is detachably mounted on the lower inner shell 11 and is located in the cavity 1b between the lower inner shell 11 and the bottom shell 12 and is placed at the communication port. The lower inner shell 11 and the bottom shell 12 are connected by bolts.

[0066] In addition, the present invention also provides a printer, and the printer includes the open cover structure described in any one of the above. It should be noted that the detailed structure of the open cover structure of the printer can refer to the embodiments of the above open cover structure and will not be elaborated here; since the above open cover structure is used in the printer of the present invention, therefore, the embodiments of the printer of the present invention include all the technical solutions of all the embodiments of the above open cover structure, and the achieved technical effects are also exactly the same, and will not be elaborated here.

[0067] For a better understanding of the present utility model, the following will Figures 1 to 13 describe in detail the technical solution of the present utility model:

[0068] In this solution, before assembling the elastic member 4, the installation of the seat body 31 and the lower shell 1 is first completed, so that the installation arm 32 passes through the avoidance opening 21a of the upper shell 2 to extend out of the cavity 1a of the lower shell 1. Then, two spiral springs 44 are placed in the two installation gaps 21d, and the short force arm 42 is placed in the limiting groove 31b of the adjacent installation arm 32. At the same time, the two integrally connected pressing sections 432 are placed in the clamping groove 21c of the rotating end 21. Then, the rotating shaft 5 is sequentially passed through the through hole 32b of the installation arm 32 far from the baffle 6, the spiral spring 44 far from the baffle 6, the shaft hole 21b, the spiral spring 44 close to the baffle 6, and the through hole 32b of the installation arm 32 close to the baffle 6, and finally blocked by the baffle 6 to complete the installation of the elastic member 4. After the installation of the elastic member 4 is completed, the upper cover 23 is installed on the upper inner shell 22.

[0069] The above specific implementation manners of the present utility model do not constitute a limitation on the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A cover opening structure, characterized in that: include: A lower shell having a cavity with an opening on one side; An upper shell is rotatably mounted on the lower shell and is located at the opening. The upper shell can open and close the opening when rotating, and a rotation end thereof is provided with an escape opening communicating with the cavity. A bracket, comprising a seat body and a mounting arm connected to each other, wherein the seat body is detachably mounted on the lower shell and is located in the cavity, and the mounting arm extends out of the cavity from the avoidance opening; and The elastic member has two elastic arms respectively pressed against the installation arm and the rotating end, and is used for driving the upper shell to return to the position of opening the opening.

2. The cover opening structure according to claim 1, characterized in that: The rotating end is provided with an axial hole along its axial direction, and the cover opening structure further includes a rotating shaft, the rotating shaft is installed on the mounting arm and penetrates the axial hole, and one end close to the mounting arm protrudes from the axial hole; The elastic member also includes a coil spring connected between the two elastic arms, one of the two elastic arms is a short arm and the other is a long arm, the short arm presses against the mounting arm, the coil spring is sleeved on one end of the rotating shaft outside the shaft hole, and the long arm presses against the rotating end.

3. The cover opening structure according to claim 2, characterized in that: The rotating end is provided with a clamping groove, the clamping groove is spaced apart from the shaft hole along the radial direction thereof, and the side away from the shaft hole is open; The long force arm comprises an extending section and a pressing section connected to each other, the extending section is connected to the coil spring, the pressing section is connected to the extending section at an angle and is arranged in the clamping slot.

4. The cover opening structure according to claim 3, characterized in that: The avoidance openings are provided with two, and the two avoidance openings are located on both sides of the shaft hole in the axial direction, and are spaced apart from the shaft hole to form a mounting gap, and the mounting arms are provided with two corresponding avoidance openings, and the two ends of the rotating shaft extend out of the shaft hole respectively, and are mounted on the two mounting arms; The elastic member is provided with two groups, the coil springs of the two groups are respectively sleeved on the two ends of the rotating shaft and located in the corresponding installation gaps, the short force arms of the two groups are respectively pressed against the two installation arms, and the pressing sections of the two groups are both arranged in the slots and connected as one.

5. The cover opening structure according to claim 2, characterized in that: The mounting arm is provided with a mounting slot for placing the short lever arm; and / or, The mounting arm is provided with a through hole along the axial direction of the rotating shaft, and the rotating shaft is rotatably arranged in the through hole. The opening cover structure also includes a baffle, which is arranged on a side of the mounting arm away from the shaft hole and is used to stop the rotating shaft.

6. The cover opening structure according to claim 1, characterized in that: The upper shell includes an upper inner shell and an upper cover along a direction away from the lower shell, wherein the upper inner shell and the upper cover are detachably connected and together surround a mounting cavity; The rotating end is located on the upper inner shell and placed in the installation cavity, and the avoidance port is connected with the containing cavity and the installation cavity.

7. The cover opening structure according to claim 6, characterized in that: The upper inner shell is provided with a connecting hole, the upper cover is provided with a mounting screw hole corresponding to the connecting hole, the upper shell further comprises a mounting bolt, the mounting bolt is passed through the connecting hole and is screwed into the mounting screw hole; and / or, A positioning groove is provided on the inner side of the upper cover, and a positioning protrusion is provided on the upper inner shell corresponding to the positioning groove, and the positioning protrusion can be clamped in the positioning groove.

8. The cover opening structure according to claim 6, characterized in that: The rotating end is provided with a wire passing groove, and the wire passing groove extends along the axial direction of the rotating end.

9. The cover opening structure according to claim 1, characterized in that: The seat body is provided with a matching hole, the lower shell is provided with a fixing screw hole corresponding to the matching hole, and the cover opening structure further includes a fixing bolt, the fixing bolt is passed through the matching hole and screwed into the fixing screw hole; and / or, The seat body is provided with a limiting groove, and the lower shell is provided with a limiting protrusion corresponding to the limiting groove, and the limiting protrusion can be clamped in the limiting groove.

10. A printer, characterized in that: It comprises the cover opening structure as described in any one of claims 1 to 9.

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