A cover opening structure and a printer

Abstract

The utility model discloses a kind of cover opening structure and printer, it is related to printer technical field, including the seat body and cover body of rotation connection, the cover body is provided with elastic block, and limiting slot is provided on the elastic block;The abutment convex strip is set on the seat body, the abutment convex strip is used when the cover body is overturned to specific angle relative to the seat body, the abutment convex strip is clamped into the limiting slot, to maintain the cover opening state of the cover body.Elastic deformation capability is provided by elastic block on cover body, make the limiting slot and the abutment convex strip on seat body cooperate, when cover body is overturned to specific angle, the abutment convex strip is clamped into limiting slot on elastic block, using the energy storage and release of elastic deformation of elastic block, maintain cover opening state.No additional torsion spring is needed, reduce the dependence on elastic element, reduce manufacturing cost;Simultaneously avoid torsion spring due to long-term fatigue and lead to self-locking failure problem.

Description

Technical Field

[0001] This utility model relates to the field of printer technology, and in particular to a cover-opening structure and a printer. Background Technology

[0002] Printers typically have an upper and lower shell structure, with the upper and lower shells opening and closing directly through the relationship between the shaft and holes. To facilitate paper changing, the upper cover needs to be kept open when it is rotated to a certain angle relative to the base.

[0003] For example, the Chinese invention patent published on May 10, 2017, entitled "A Connecting Structure for Upper and Lower Shells and a Printer Thereof," with publication number CN106626823A, provides an upper shell assembly and a lower shell assembly that are rotatably connected. The rear ends of the upper shell assembly and the lower shell assembly are rotatably connected by a torsion spring and a rotating shaft. A limiting member is provided between the upper shell assembly and the lower shell assembly to restrict the rearward rotation range of the upper shell assembly. Thus, the upper shell assembly flips backward under the action of the torsion spring. A limiting platform is provided on the lower shell, and a boss is provided on the upper shell to prevent the upper shell from over-flipping, thus completing the limiting and self-locking.

[0004] This self-locking limit method requires higher torque force from the torsion spring, which increases the cost of the torsion spring and makes it more difficult to close the lid. When the elasticity of the torsion spring weakens due to long-term use, it is less effective at maintaining the open state.

[0005] Therefore, a printer lid opening structure with a long lifespan and more stable self-locking mechanism is needed. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a cover opening structure and a printer to solve the problem of the short lifespan of the current cover opening structure.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a cover opening structure, including a base and a cover that are rotatably connected, wherein an elastic block is provided on the cover and a limiting groove is provided on the elastic block; an abutting protrusion is provided on the base, wherein the abutting protrusion is used to engage with the limiting groove when the cover is rotated relative to the base to a specific angle, so as to maintain the open state of the cover.

[0008] Preferably, the elastic block extends integrally from the cover body, and the two sides of the elastic block are not connected to the rest of the cover body, forming a cantilever structure.

[0009] Preferably, the elastic block is located on the side of the rotating shaft portion of the cover away from the middle of the cover, and the side of the elastic block near the middle of the cover has a notch.

[0010] Preferably, there are two elastic blocks, which are symmetrically located on the left and right ends of the rotating shaft of the cover.

[0011] Preferably, the elastic block bends and deforms following the rotation axis of the cover, and the limiting groove is located outside the tail end of the bent portion of the elastic block.

[0012] Preferably, the length of the elastic block along the rotation axis of the cover is 3~5mm, the depth of the limiting groove along the thickness direction of the elastic block is 1.5~2.5mm, and the width of the limiting groove along the extension direction of the elastic block is 1.5~2.5mm.

[0013] Preferably, the material of the elastic block is one of silicone, rubber, or polyurethane.

[0014] Preferably, the protrusion of the abutting ridge is oriented towards the height direction of the seat.

[0015] Preferably, the limiting groove is V-shaped with an opening angle of 110~150°, and the vertical cross-section of the abutting protrusion in the width direction is arc-shaped.

[0016] Preferably, it includes the opening structure as described in any of the above, and the printer core.

[0017] Compared with the prior art, the beneficial effects that this utility model can achieve are: This invention utilizes an elastic block on the cover to provide elastic deformation capability, allowing the limiting groove to engage with the abutting protrusion on the base. When the cover is flipped to a specific angle, the abutting protrusion engages with the limiting groove on the elastic block, storing and releasing energy through the elastic deformation of the elastic block to maintain the open state. This eliminates the need for an additional torsion spring, reducing reliance on elastic elements and lowering manufacturing costs; it also avoids the self-locking failure problem caused by long-term fatigue of the torsion spring.

[0018] By setting the limiting groove on the elastic block, the cover can be elastically engaged or disengaged from the limiting groove when rotated by external force. This avoids the problem of the column being easily tilted and deformed after repeated use due to the need for abutment protrusions on the top of the column directly on the base to cooperate with the limiting groove directly on the cover. This results in the abutment protrusions not fitting properly with the limiting groove and not locking tightly. Therefore, setting the limiting groove on the elastic block can effectively improve the service life of the cover opening structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the printer according to an embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram of the structure in the open state; Figure 3 for Figure 2A structural diagram of the hidden part of the structure; Figure 4 for Figure 1 A schematic diagram of the structure of the base; Figure 5 for Figure 1 A schematic diagram of the cover structure; The components are: 1. Cover; 11. Limiting groove; 12. Elastic block; 2. Seat; 21. Elastic arm; 211. First connecting section; 212. Top abutting section; 213. Free section; 214. Second connecting section; 22. Abutting protrusion; 23. Anti-interference groove; 3. Rotating shaft; 31. Rotating shaft core; 4. Printer. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.

[0021] like Figures 1-5 As shown, this utility model provides a stable opening structure, including a seat 2 and a cover 1 that are rotatably connected. In this embodiment, the seat 2 and the cover 1 have a rotating shaft 3 on one side, and are rotatably connected by a rotating shaft core 31.

[0022] The cover 1 is provided with a limiting groove 11. The limiting groove 11 can be directly part of the cover 1, or it can be fixedly connected to the cover 1 by an intermediate component. The seat 2 is provided with an elastic arm 21 and an abutting protrusion 22 provided on the elastic arm 21; the abutting protrusion 22 is used to engage in the limiting groove 11 when the cover 1 is flipped to a specific angle relative to the seat 2, so as to maintain the open state of the cover 1.

[0023] This invention replaces the traditional torsion spring by having an elastic arm 21 on the base 2 cooperate with a limiting groove 11 on the cover 1. When the cover 1 is flipped to a specific angle, the elastic arm 21 drives the abutment strip 22 to engage with the limiting groove 11. The elastic deformation of the elastic arm 21 provides the self-locking force, eliminating the need for an additional torsion spring, reducing reliance on elastic elements, simplifying the structure, and reducing the risk of self-locking failure due to torsion spring fatigue after long-term use. This solves the problems of high cost and poor long-term stability of traditional self-locking structures that rely on torsion springs.

[0024] In a basic embodiment, a rigid or low-elasticity column is directly fixed to the base 2, with an abutment protrusion 22 positioned at the top of the column. A limiting groove 11 is directly formed on the cover 1 corresponding to the abutment protrusion 22. When the cover 1 is repeatedly opened and closed, it achieves self-locking through the limiting groove 11 and the abutment protrusion 22 at the top of the column. This self-locking structure does not require high requirements for the torsion spring. However, this structure suffers from stress concentration leading to deformation and failure of fit accuracy: the connection between the column and the base 2 is a fixed constraint point. When the cover 1 rotates, the collision force and friction force between the abutment protrusion 22 and the limiting groove 11 are transmitted to the root of the column, forming significant bending and torque. After long-term, high-frequency use, the root of the column is prone to plastic deformation due to stress concentration, causing the column to tilt as a whole. After the column tilts, the position and direction of the abutment protrusion 22 at its top will shift, increasing the fit gap with the limiting groove 11 or even causing misalignment, ultimately leading to self-locking failure.

[0025] In this embodiment, the abutment protrusion 22 is integrated into the elastic arm 21. Utilizing the elastic deformation characteristics of the elastic arm 21, the deformation problem of traditional rods is fundamentally solved. The elastic arm 21 itself possesses high elastic modulus and fatigue resistance. When the cover 1 rotates, the elastic arm 21 undergoes controllable elastic stretching or bending with the movement of the cover 1, rather than rigidly transmitting force. At this time, the engagement force between the abutment protrusion 22 and the limiting groove 11 is "buffered" and "dispersed" through the deformation of the elastic arm 21, avoiding local stress concentration. Even with repeated opening and closing over a long period, the elastic arm 21 only undergoes reversible deformation within its elastic range, and its overall shape and the position of the abutment protrusion 22 remain stable. The elastic characteristics of the elastic arm 21 allow it to finely adjust the position of the abutment protrusion 22 during the opening and closing of the cover 1. For example, when the cover 1 experiences angular displacement due to manufacturing tolerances or slight collisions, the elastic arm 21 can actively push the abutment protrusion 22 to conform to the limiting groove 11 through its own deformation, compensating for gaps and ensuring the accuracy of the locking action. This "adaptive" capability significantly reduces the risk of misalignment. Since the elastic arm 21 avoids plastic deformation and the force on the abutting protrusion 22 is borne by the elastic arm 21 as a whole rather than concentrated at a certain point, the wear rate of its key components, the elastic arm 21 and the limiting groove 11, is greatly reduced. The service life of the abutting protrusion 22 and the limiting groove 11 in this solution can reach more than 3 times that of the traditional column solution.

[0026] Therefore, this embodiment, by setting the abutting protrusion 22 on the elastic arm 21, has the advantages of elastic deformation to disperse stress, dynamic adjustment of fitting accuracy, and extended structural life compared to the above basic embodiment, significantly improving the service life and reliability of the opening structure.

[0027] Furthermore, the protruding direction of the abutting ridge 22 faces the height direction of the base 2, which is perpendicular to the direction of the cover 1 in its closed state. By limiting the protruding direction of the abutting ridge 22, the contact between the abutting ridge 22 and the limiting groove 11 is made to better conform to the opening and closing movement trajectory of the cover 1. This directional design is consistent with the displacement direction when the cover 1 is flipped, reducing the lateral force during contact.

[0028] The protruding direction of the abutting protrusion 22 is adapted to the opening state. The abutting protrusion 22 is located below the upper limit groove 11 of the cover 1. Compared with the abutting protrusion 22 being located on the side of the limit groove 11 with the protruding direction facing the horizontal direction, the abutting protrusion 22 being located below the upper limit groove 11 of the cover 1 can utilize the gravitational potential energy of the cover 1 to make the engagement of the limit groove 11 and the abutting protrusion 22 tighter. When the cover 1 is opened and closed, the elastic block 12 deforms with the rotation of the cover 1, causing the position of the limit groove 11 to droop accordingly. The abutting protrusion 22 is pushed upward by the elastic force of the elastic arm 21, making the engagement tighter. The tighter engagement can effectively resist external disturbances and prevent the cover 1 from closing accidentally.

[0029] Please refer to Figure 4 The elastic arm 21 includes a first connecting segment 211, a top abutment segment 212, a free segment 213, and a second connecting segment 214 connected in sequence; wherein, one end of the first connecting segment 211 is connected to one side of the rotating shaft portion 3 of the seat body 2, and the other end is connected to one end of the top abutment segment 212; the top abutment segment 212 is inclined upward, and its other end is connected to one end of the free segment 213; the other end of the free segment 213 is connected to one end of the second connecting segment 214, and the other end of the second connecting segment 214 is connected to the other side of the rotating shaft portion 3 of the seat body 2; the abutment protrusion 22 is provided on the top of the top abutment segment 212.

[0030] The elastic arm 21 is composed of a first connecting section 211 fixed to one side of the rotating shaft 3 of the base 2, an upwardly inclined abutting section 212, a transitional free section 213, and a second connecting section 214 fixed to the other side of the base 2, connected in sequence. The upwardly inclined design of the abutting section 212 allows it to undergo tensile / compressive deformation when the cover 1 is opened, storing elastic potential energy. When the cover 1 reaches a specific angle, the abutting protrusion 22 at the top of the abutting section 212 precisely engages with the limiting groove 11, releasing some potential energy to maintain the open state. The multi-segment structure disperses stress concentration points, avoiding fatigue fracture caused by long-term deformation at a single location, extending the life of the elastic arm 21, and improving the accuracy and durability of self-locking through multi-segment elastic deformation.

[0031] In this embodiment, the base 2 is provided with an anti-interference groove 23 in the area below the non-force-bearing side of the elastic arm 21. By providing the anti-interference groove 23 below the non-force-bearing side of the base 2 corresponding to the elastic arm 21, the base 2 is protected from interference. Without this groove, the bottom of the elastic arm 21 might come into contact with other components of the base 2 during deformation, causing friction or jamming. The anti-interference groove 23, by providing reserved space, avoids such contact, ensuring that the elastic arm 21 can deform freely, guaranteeing that the abutment protrusion 22 accurately engages with the limiting groove 11, improving the reliability of the self-locking action, and ensuring the smoothness of the self-locking action.

[0032] Preferably, in this embodiment, the length of the abutting protrusion 22 along the rotation axis of the cover 1 is 3-5 mm, the height of the abutting protrusion 22 is 1-2 mm, and the width of the abutting protrusion 22 is 1-2 mm. Its longer length ensures sufficient contact area with the limiting groove 11, avoiding excessive localized force and providing greater resistance. The height and width control the deformation of the elastic arm 21, ensuring moderate self-locking force. The dimensional range conforms to conventional machining accuracy, reducing manufacturing costs.

[0033] Preferably, in this embodiment, there are two elastic arms 21 and two abutting protrusions 22, symmetrically distributed on both sides of the rotating shaft portion 3 of the base 2; the limiting groove 11 on the cover 1 is provided corresponding to the position of the abutting protrusions 22. When the cover 1 is opened, the elastic arms 21 on both sides deform synchronously, and the abutting protrusions 22 on both sides simultaneously engage with the limiting groove 11, ensuring uniform force on the cover 1 and preventing wear or deformation caused by stress concentration on one side; the symmetrical structure also improves the overall resistance to lateral impact and enhances the reliability of the self-locking structure.

[0034] Preferably, the top abutment section 212 is inclined upward, and its other end is inclined downward to connect to one end of the free section 213; the other end of the free section 213 extends horizontally to connect with one end of the second connecting section 214. After the top abutment section 212 is inclined upward, the free section 213 is inclined downward to connect to the second connecting section 214, and the free section 213 extends horizontally to the second connecting section 214. This multi-segment bending design of "first inclined upward and then inclined downward" makes the deformation trajectory of the elastic arm 21 smoother when the cover 1 is opened and closed, the deformation stress distribution more uniform, and reduces the risk of fatigue fracture in local high stress areas. The horizontally extending free section 213 can also increase the effective length of the elastic arm 21, improve its elastic deformation, and under the same material, the longer the length of the free section 213, the stronger the elastic potential energy storage capacity, thereby enhancing the stability of the self-locking force.

[0035] Preferably, in this embodiment, an elastic block 12 is integrally formed and extended on the cover 1, and the limiting groove 11 is disposed on the elastic block 12. The limiting groove 11 is disposed on the elastic block 12 of the cover 1. When the abutting protrusion 22 is engaged in the limiting groove 11, the elastic deformation of the elastic block 12 can absorb some of the impact energy, such as the inertial force when the cover 1 is quickly opened, avoiding wear on the protrusion or limiting groove 11 caused by hard collisions. Simultaneously, the flexible characteristics of the elastic block 12 make the fit between the limiting groove 11 and the protrusion tighter, and slight deformation can compensate for manufacturing tolerances, improving the reliability of the self-locking mechanism.

[0036] In another embodiment, a rigid or low-elasticity column is directly fixed to the base 2, with an abutment protrusion 22 disposed on the top of the column. An elastic block 12 is fixedly connected to the cover 1, and a limiting groove 11 is disposed on the elastic block 12. This allows the elastic block 12 on the cover 1 to provide elastic deformation capability. The limiting groove 11 cooperates with the abutment protrusion 22 on the base 2. When the cover 1 is flipped to a specific angle, the abutment protrusion 22 engages with the limiting groove 11 on the elastic block 12, utilizing the elastic deformation of the elastic block 12 to store and release energy, maintaining the open state. This eliminates the need for an additional torsion spring, reducing reliance on elastic elements and lowering manufacturing costs; it also avoids the self-locking failure problem caused by long-term fatigue of the torsion spring. Furthermore, it avoids the problem of stress concentration leading to deformation and failure of fit accuracy caused by the limiting groove 11 being directly disposed on the cover 1 and lacking elasticity.

[0037] By setting the limiting groove 11 on the elastic block 12, the cover 1 can be elastically engaged or disengaged from the limiting groove 11 when rotated by external force. This avoids the situation where the column is easily tilted and deformed after multiple uses due to the abutting protrusion 22 on the top of the column directly set on the base 2 cooperating with the limiting groove 11 directly set on the cover 1. As a result, the position and direction of the abutting protrusion 22 are not compatible with the limiting groove 11 and cannot be tightly engaged. Therefore, setting the limiting groove 11 on the elastic block 12 can effectively improve the service life of the cover opening structure.

[0038] Preferably, in this embodiment, the elastic block 12 extends integrally from the cover 1, forming a cantilever structure whose two sides are not connected to the rest of the cover 1, allowing it to bend and deform freely when the cover 1 rotates. The cantilever structure of the elastic block 12 is equivalent to an elastic lever: one end is fixed to the cover 1, and the other end can undergo controllable elastic deformation with the movement of the cover 1. This design avoids stress concentration caused by traditional rigid connections, allowing the elastic block 12 to absorb the kinetic energy of the cover 1 rotation more efficiently, buffering the collision between the abutment protrusion 22 and the limiting groove 11, and extending the structural life. By enhancing its elastic deformation capability through the cantilever structure, the flexibility and durability of the self-locking action are improved, and the integral molding manufacturing method can reduce production costs.

[0039] Preferably, in this embodiment, the elastic block 12 is located on the side of the rotating shaft portion 3 of the cover 1 away from the middle of the cover 1, and the elastic block 12 has a notch on the side near the middle of the cover 1. The notch on the side of the elastic block 12 near the middle reduces material usage, weight, and cost. Simultaneously, a deformation guiding zone is formed at the notch. When the cover 1 rotates, the elastic block 12 corresponding to the notch, being unconstrained, can deform preferentially, guiding the elastic block 12 to bend along a preset path, avoiding stress concentration caused by localized twisting. By limiting the position of the elastic block 12 and the notch design, its deformation path and force distribution are optimized, further improving self-locking stability and manufacturing feasibility.

[0040] Furthermore, there are two elastic blocks 12, symmetrically located on the left and right ends of the rotating shaft portion 3 of the cover 1. The two elastic blocks 12 are symmetrically distributed on the left and right ends of the rotating shaft portion 3 of the cover 1, and corresponding limiting grooves 11 are provided on the cover 1. When the cover 1 is opened, the elastic blocks 12 on both sides undergo synchronous elastic deformation, and their limiting grooves 11 simultaneously engage with the abutting protrusions 22 of the seat 2. The symmetrical structure ensures that the cover 1 is subjected to uniform force, avoiding excessive deformation or breakage of the elastic block 12 on one side due to individual force; simultaneously, the abutting protrusions 22 on both sides simultaneously engage with the limiting grooves 11, enhancing the reliability of the self-locking mechanism.

[0041] Preferably, in this embodiment, the elastic block 12 bends and deforms following the rotation axis 3 of the cover 1, and the limiting groove 11 is located on the outer side of the tail end of the bent portion of the elastic block 12. The elastic block 12 bends and deforms following the rotation axis 3 of the cover 1, such as in an arc shape, with the limiting groove 11 provided on the outer side of the tail end of the bent portion. Thus, when the cover 1 rotates from the closed state to the opening direction to the position abutting the protrusion 22, the elastic block 12 bends and deforms with the movement of the cover 1, storing elastic potential energy; when the cover 1 reaches a specific angle, the limiting groove 11 at the tail end of the bent portion moves precisely to the position where the seat 2 abuts the protrusion 22. At this time, the elastic block 12 releases some elastic potential energy, pushing the limiting groove 11 to tightly engage with the protrusion, maintaining the open state. The design of the bent portion extends the deformation path of the elastic block 12, increases the storage of elastic potential energy, and makes the self-locking force more stable.

[0042] Preferably, in this embodiment, the length of the elastic block 12 along the rotation axis of the cover 1 is 3-5 mm, the depth of the limiting groove 11 along the thickness direction of the elastic block 12 is 1.5-2.5 mm, and the width of the limiting groove 11 along the extension direction of the elastic block 12 is 1.5-2.5 mm. The length along the rotation axis of the cover 1 determines the deformation range of the elastic block 12. If the length is too short, the deformation will be insufficient and it will not be able to store enough elastic potential energy; if it is too long, it may break unexpectedly due to insufficient rigidity. The range of 3-5 mm is the result of optimizing the elastic modulus of conventional materials such as polyurethane. The depth and width need to match the size of the abutting protrusion 22. If it is too shallow or too narrow, the fitting gap will be too large and the self-locking will not be firm; if it is too deep or too wide, it will increase the resistance when the cover 1 is opened and closed. The range of 1.5-2.5 mm is the result of ergonomics, moderate closing force, and optimized manufacturing process. By limiting the key dimensional parameters of the elastic block 12 and the limiting groove 11, the elastic deformation and fitting accuracy are balanced to ensure the processing feasibility and long-term stability of the self-locking structure.

[0043] Preferably, in this embodiment, the material of the elastic block 12 is one of silicone, rubber, or polyurethane. By selecting a suitable material for the elastic block 12, elasticity, fatigue resistance, and cost are balanced, thus solving the long-term stability problem of traditional torsion springs caused by material aging.

[0044] Preferably, the limiting groove 11 is V-shaped with an opening angle of 110~150°, and the vertical cross-section of the abutting protrusion 22 in the width direction is arc-shaped. The two side walls of the V-shaped structure can guide and constrain the abutting protrusion 22. When the protrusion slides into the groove, the two side walls gradually tighten, automatically correcting the positional deviation of the protrusion, such as the offset caused by manufacturing tolerances or collisions, to ensure precise fit. The opening angle of 110~150° can ensure sufficient limiting space without causing looseness due to excessive opening. The vertical cross-section of the abutting protrusion 22 in the width direction is arc-shaped, forming line contact with the arc-shaped inner wall of the V-shaped groove, rather than point contact, which increases the contact area and reduces the pressure per unit area. At the same time, the arc structure can better disperse the impact force, such as the inertial force when the cover 1 is opened quickly, and improve the durability of the fit.

[0045] Preferably, the elastic block 12 is made of an elastic material (such as silicone, rubber, or polyurethane); the elastic arm 21 is made of an elastic metal or elastic plastic (such as stainless steel, spring steel, or polycarbonate). By selecting the right materials, the rigidity of the elastic arm 21 and the cushioning properties of the elastic block 12 are balanced, thus improving the overall lifespan.

[0046] This application also provides a printer 4, including the opening structure described above, and a printer core. The printer 4 requires a reliable self-locking function to maintain the open state, such as during paper changes or maintenance. This structure, through the design of an elastic arm 21 + abutment protrusion 22 + limiting groove 11, replaces the traditional torsion spring, avoiding the self-locking failure problem caused by torsion spring fatigue over long-term use, while also reducing the difficulty of closing the cover (no need to overcome high torque), thus improving the user experience and reliability of the printer 4.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cover opening structure, comprising a base and a cover rotatably connected, characterized in that: An elastic block is provided on the cover, and a limit groove is provided on the elastic block; The base is provided with an abutting protrusion. When the cover is flipped to a specific angle relative to the base, the abutting protrusion is engaged in the limiting groove to maintain the open state of the cover.

2. The opening structure according to claim 1, characterized in that: The elastic block extends integrally from the cover, and the two sides of the elastic block are not connected to the rest of the cover, forming a cantilever structure.

3. The opening structure according to claim 2, characterized in that: The elastic block is located on the side of the rotating shaft of the cover away from the middle of the cover, and the side of the elastic block near the middle of the cover has a notch.

4. The opening structure according to claim 3, characterized in that: There are two elastic blocks, which are symmetrically located on the left and right ends of the rotating shaft of the cover.

5. The opening structure according to claim 3, characterized in that: The elastic block bends and deforms following the rotation axis of the cover, and the limiting groove is located outside the tail end of the bent portion of the elastic block.

6. The opening structure according to claim 1, characterized in that: The length of the elastic block along the rotation axis of the cover is 3~5mm, the depth of the limiting groove along the thickness direction of the elastic block is 1.5~2.5mm, and the width of the limiting groove along the extension direction of the elastic block is 1.5~2.5mm.

7. The opening structure according to claim 2, characterized in that: The material of the elastic block is one of silicone, rubber, or polyurethane.

8. The opening structure according to claim 1, characterized in that: The protrusion of the abutting ridge is oriented towards the height direction of the seat.

9. The opening structure according to claim 1, characterized in that: The limiting groove is V-shaped with an opening angle of 110~150°, and the vertical cross-section of the abutting protrusion in the width direction is arc-shaped.

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

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