A cover opening and closing structure and a printer

Abstract

The utility model discloses a kind of opening and closing cover structure and printer, including shell, machine core, bin cover and rubber roller, shell has paper bin, machine core both sides are provided with mounting groove, one side of each mounting groove is provided with elastic member, bin cover is rotatably installed in shell, bin cover both sides are provided with tab, each tab is provided with limiting slot, bin cover two side walls are further provided with protrusion, rubber roller both ends are provided with rotating support, rotating support is inserted into mounting groove, elastic member is abutted on rotating support circumference surface.The utility model is provided with elastic member in the position of machine core mounting groove, limiting slot is opened in the tab of bin cover both sides, rotating support is set in the both ends of rubber roller and is inserted into mounting groove, elastic member is abutted on rotating support circumference surface, the closure locking of bin cover is realized, when opening, only need to exert external force to overcome elastic member elasticity to make rotating support separate from mounting groove, without key structure, avoid the wear and tear, jam or jam problem between traditional key and slot hole due to long-term use.

Description

Technical Field

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

[0002] Current printers typically use a button-type mechanical structure to control the opening of the paper tray cover. This method relies on the user applying pressure to the button, and the unlocking and opening actions are achieved through the direct interaction between the button component and the corresponding slot on the housing. However, this structure has gradually revealed inherent technical flaws in actual long-term use.

[0003] Because the paper tray cover is opened and closed frequently, the button and slot continuously generate mechanical friction and pressure during repeated pressing and resetting. This long-term, reciprocating interaction causes gradual wear on the surfaces around the button and the mating surfaces in contact with the slot, especially plastic parts, which are prone to wear marks or plastic deformation. As wear accumulates, the clearance between the button and the slot may change, causing not only loose parts and abnormal noises, but more seriously, interference between them, or even jamming or complete seizure. Once jammed, the user will be unable to open the paper tray cover by normal pressing, which not only directly affects paper loading and replacement, but also brings significant inconvenience to daily maintenance and troubleshooting. Therefore, we provide a cover opening and closing structure and printer to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an opening and closing cover structure and a printer.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An opening and closing cover structure having three perpendicular directions: a first direction, a second direction, and a third direction, comprising:

[0007] A housing having a paper compartment;

[0008] The movement is fixedly installed on the housing. The movement has mounting grooves on both sides along the first direction, and each mounting groove has an elastic element on one side along the second direction.

[0009] A storage compartment cover is rotatably mounted on the housing and is used to cover the paper compartment. The storage compartment cover has protruding plates on both sides along the first direction. The protruding plates are located at the ends of the storage compartment cover along the second direction and extend along the third direction. Each protruding plate has a limiting groove, and the two limiting grooves are coaxially arranged. The storage compartment cover also has protrusions on both side walls along the first direction.

[0010] A rubber roller, with its two ends respectively disposed in the two limiting grooves, a convex plate sleeved on both ends of the rubber roller, and a rotating support member disposed at both ends of the rubber roller, the rotating support member extending into the mounting groove, and the elastic member abutting against the circumferential surface of the rotating support member.

[0011] Preferably, the sidewall of the mounting groove is provided with a first inclined guide surface.

[0012] Preferably, the cover is provided with grooves on both sides of the first direction, and the protrusion is provided on the bottom wall of the groove.

[0013] Preferably, the mechanism includes a bracket, on which a print head is mounted, and mounting slots are provided at both ends of the bracket along the first direction. A rotary drive component is also fixedly mounted on the bracket, and a drive wheel is provided at the rotating end of the rotary drive component. The drive wheel is connected to the rubber roller in a transmission connection.

[0014] Preferably, rotating arms are fixedly provided on both sides of the cover, and rotating columns are fixedly provided on the sides of the two rotating arms that are close to each other. Mounting holes are provided on both sides of the housing, and the rotating columns extend at least partially into the mounting holes on the same side.

[0015] Preferably, the housing is further provided with clearance grooves on both side walls along the first direction, the clearance grooves extending to the mounting holes, and a second inclined guide surface is provided between the clearance grooves and the mounting holes.

[0016] Preferably, the housing includes a bottom shell and a middle shell connected to each other, the bottom shell and the middle shell surrounding each other to form a receiving cavity, the middle shell having the paper tray, the receiving cavity communicating with the paper tray, and flanges provided on both side walls of the middle shell along a first direction, the flanges having through holes along a third direction.

[0017] Preferably, the rubber roller includes a rotating shaft and a roller body. The roller body is disposed in the middle of the rotating shaft along the axial direction. The length of the roller body is less than that of the rotating shaft. Rotating support members are disposed at both ends of the rotating shaft. A driven wheel is disposed at one end of the rotating shaft along the axial direction. The driven wheel is connected to the driving wheel in a driving transmission.

[0018] Preferably, the limiting groove has an opening, and an elastic arm is formed between the opening and the side wall of the protruding plate. The diameter of the limiting groove is D1, the diameter of the rotating shaft is D2, and the maximum length of the opening is L, satisfying: L < D2 < D1.

[0019] This application also provides a printer, including the opening and closing cover structure described in any one of the above-mentioned methods.

[0020] This utility model has the following advantages:

[0021] 1. This utility model utilizes the cooperation of a housing, a mechanism, a compartment cover, and a rubber roller. Elastic elements are installed at the mounting grooves on both sides of the mechanism. Limiting grooves are formed on the protruding plates on both sides of the compartment cover. Rotating support elements are installed at both ends of the rubber roller and extend into the mounting grooves. The elastic elements abut against the circumferential surface of the rotating support elements to achieve the closing and locking of the compartment cover. When opening the cover, only external force needs to be applied to overcome the elastic force of the elastic elements, causing the rotating support elements to disengage from the mounting grooves. No button structure is required, avoiding the wear, loosening, abnormal noise, interference, jamming, or stuck problems that occur between traditional buttons and slots due to long-term use. This improves the reliability and service life of the opening operation and ensures the convenience of paper loading and replacement.

[0022] 2. This utility model provides a first inclined guide surface on the side wall of the mounting groove. This first inclined guide surface can guide and position the rotating support component as it enters the mounting groove, so that the rotating support component can overcome the elastic force of the elastic component and enter the mounting groove more smoothly and accurately. This effectively reduces the resistance of the closing operation, avoids misalignment and interference between components, and improves the smoothness and reliability of the lid closing action.

[0023] 3. This utility model provides users with a clear and easy-to-apply operating position by opening grooves on both sides of the lid along the first direction and setting protrusions on the bottom wall of the grooves. This increases the contact area and friction of the point of application of external force when opening the lid, effectively preventing hand slippage during operation and ensuring that the applied external force can be fully and effectively applied to the lid. This more reliably overcomes the elastic force of the elastic element to open the lid, improving the convenience and success rate of opening the lid. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the printer of this utility model in an exploded state.

[0025] Figure 2 This is a structural diagram of the shell and cover of this utility model in their assembled state.

[0026] Figure 3 This is a side view of the inner shell of this utility model.

[0027] Figure 4 This is a schematic diagram of the three-dimensional structure of the bin cover of this utility model.

[0028] Figure 5 This is a three-dimensional structural diagram of the mechanism of this utility model.

[0029] Figure 6 This is a cross-sectional view of the compartment cover of this utility model.

[0030] Figure 7 This is a three-dimensional schematic diagram of the rubber roller of this utility model.

[0031] Figure 8 This is a front view schematic diagram of the rubber roller of this utility model.

[0032] In the diagram, 100 is the housing; 101 is the mounting hole; 102 is the clearance groove; 103 is the second inclined guide surface; 104 is the clearance hole; 110 is the bottom shell; 120 is the middle shell; 200 is the mechanism; 201 is the mounting groove; 202 is the elastic element; 203 is the first inclined guide surface; 210 is the bracket; 220 is the print head; 230 is the rotary drive component; 231 is the drive wheel; 300 is the compartment cover; 301 is the protrusion; 302 is the groove; 310 is the convex plate; 311 is the limiting groove; 312 is the opening; 320 is the rotating arm; 321 is the rotating column; 400 is the rubber roller; 401 is the rotating support component; 410 is the rotating shaft; 420 is the roller body; 430 is the driven wheel; X is the first direction; Y is the second direction; Z is the third direction. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] like Figure 1 — Figure 8 The example shown.

[0036] A paper tray opening and closing structure has three perpendicular directions: a first direction, a second direction, and a third direction. It includes a housing 100, a paper tray 200, a tray cover 300, and a rubber roller 400. The housing 100 has a paper tray. The paper tray 200 is fixedly installed in the housing 100. The paper tray 200 has mounting grooves 201 on both sides along the first direction. Each mounting groove 201 has an elastic element 202 on one side along the second direction. The tray cover 300 is rotatably installed in the housing 100 and is used to seal the paper tray. The tray cover 300 has protruding plates 310 on both sides along the first direction. The convex plate 310 is located at the end of the bin cover 300 along the second direction. The convex plate 310 extends along the third direction. Each convex plate 310 has a limiting groove 311. The two limiting grooves 311 are coaxially arranged. The bin cover 300 also has protrusions 301 on both sides of the side wall along the first direction. The two ends of the rubber roller 400 are respectively set in the two limiting grooves 311. The convex plate 310 is sleeved on both ends of the rubber roller 400. The two ends of the rubber roller 400 are also provided with rotating support members 401. The rotating support members 401 extend into the mounting groove 201, and the elastic member 202 abuts against the circumferential surface of the rotating support member 401.

[0037] See Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, in the initial state, the compartment cover 300 is rotatably mounted on the housing 100, and the rubber roller 400 is mounted in the limiting groove 311 of the protruding plate 310. The limiting groove 311 can restrict the rubber roller 400 from disengaging from the protruding plate 310. During the rotation of the rubber roller 400, the inner wall of the limiting groove 311 will not cause motion interference to the rubber roller 400, thereby enabling the rubber roller 400 to rotate normally to drive the printing paper roll located in the paper compartment.

[0038] When the rotating cover 300 needs to cover the paper tray, the drive cover 300 rotates toward the housing 100, so that the rotating support members 401 at both ends of the rubber roller 400 enter the mounting groove 201 of the core 200. During the process of the rotating support member 401 entering the mounting groove 201, the rotating support member 401 overcomes the elastic force of the elastic member 202 and enters the mounting groove 201. At this time, the elastic member 202 abuts against the circumferential surface of the rotating support member 401, thereby limiting the rotating support member 401 and preventing the rotating support member 401 from leaving the mounting groove 201. At this time, the closing of the cover 300 is completed.

[0039] In this embodiment, in order to enable the rubber roller 400 to rotate relative to the core 200, the rotating support 401 can be a bearing, thereby reducing friction and enabling the rubber roller 400 to rotate more smoothly.

[0040] It is understandable that after the cover 300 is closed, the elastic force of the elastic element 202 prevents the cover 300 from rotating and opening the paper tray. Therefore, when it is necessary to open the cover, it is only necessary to apply an external force to the cover 300 that overcomes the elastic force of the elastic element 202, and then drive the cover 300 to rotate in the direction away from the housing 100 to open the paper tray.

[0041] In order to ensure that the force acting on the bin cover 300 has a point of application, protrusions 301 are provided on both sides of the bin cover 300 to increase friction and drive the bin cover 300 to rotate.

[0042] In this embodiment, it can be understood that since the application achieves the closing of the cover through the elastic force of the elastic element 202, it is only necessary to overcome the elastic force of the elastic element 202 when opening the paper compartment, so there is no need to press the button to unlock, thereby avoiding the inability to open the paper compartment due to jamming between the button and the button hole.

[0043] In some embodiments, the sidewall of the mounting groove 201 is provided with a first inclined guide surface 203.

[0044] Please see Figure 5 As shown, in order to make it easier for the rotating support 401 to enter the mounting groove 201, a first inclined guide surface 203 is provided on the side wall of the mounting groove 201. The first inclined guide surface 203 guides the rotating support 401, making it easier for the rotating support 401 to enter the mounting groove 201.

[0045] In some embodiments, the cover 300 is further provided with grooves 302 on both side walls along the first direction, and protrusions 301 are provided on the bottom wall of the grooves 302.

[0046] Please see Figure 1 and Figure 2 As shown, in order to further improve the application of external force to the cover 300, grooves 302 are provided on both sides of the cover 300. It can be understood that when the external force needs to drive the cover 300 to rotate, the corners or bends of the cover 300 can be used as force points to prevent the protrusions 301 from protruding too little and causing slippage, thus preventing the external force from being fully applied to the cover 300.

[0047] In some embodiments, the mechanism 200 includes a bracket 210, on which a print head 220 is disposed. Mounting grooves 201 are provided at both ends of the bracket 210 along a first direction. A rotary drive component 230 is also fixedly mounted on the bracket 210. A drive wheel 231 is provided at the rotating end of the rotary drive component 230. The drive wheel 231 is connected to the rubber roller 400 in a transmission connection.

[0048] Please see Figure 5As shown, the rotary drive 230 drives the rubber roller 400 to rotate via the drive wheel 231. The rubber roller 400 drives and transports the paper in the paper tray to the position of the print head 220. The print head 220 prints on the paper. At this time, the rubber roller 400 rotates in the circle of the mounting groove 201, that is, the rubber roller 400 and the mounting groove 201 are coaxial.

[0049] For example, the printhead 220 is a thermal printhead, the rotary drive 230 is a motor, and the drive wheel 231 can be a gear or a pulley. If the drive wheel 231 is a gear, it meshes with the rubber roller 400 for transmission. If the drive wheel 231 is a pulley, it is driven by the rubber roller 400 via a belt.

[0050] In some embodiments, rotating arms 320 are fixedly provided on both sides of the cover 300, and rotating columns 321 are fixedly provided on the sides of the two rotating arms 320 that are close to each other. Mounting holes 101 are provided on both sides of the housing 100, and the rotating columns 321 extend at least partially into the mounting holes 101 located on the same side.

[0051] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the rotating column 321 engages with the mounting hole 101, thereby enabling the cover 300 to rotate around the rotating column 321 as the pivot, thus achieving a rotational engagement connection between the cover 300 and the housing 100.

[0052] In this embodiment, the rotating column 321 is a cylinder, and the mounting hole 101 is a cylindrical hole. The rotating column 321 and the mounting hole 101 are fitted together to achieve a hole-shaft rotational fit.

[0053] In some embodiments, the housing 100 is further provided with clearance grooves 102 on both side walls along the first direction, the clearance grooves 102 extend to the mounting holes 101, and a second inclined guide surface 103 is provided between the clearance grooves 102 and the mounting holes 101.

[0054] Please continue reading. Figure 3As shown, in this embodiment, in order to make it easier for the rotating column 321 to extend into the mounting hole 101, clearance grooves 102 are provided on both side walls of the housing 100, so that the rotating column 321 can enter the mounting hole 101 without obstruction. In order to prevent the rotating column 321 from falling out of the mounting hole 101, a second inclined guide surface 103 is provided between the mounting hole 101 and the clearance groove 102. Specifically, the second inclined guide surface 103 guides the rotating column 321 and can also block the rotating column 321 when it is inserted into the mounting hole 101, so as to prevent the rotating column 321 from falling out of the mounting hole 101. That is, the second inclined guide surface 103 plays the role of guiding and limiting the rotating column 321.

[0055] In some embodiments, the housing 100 includes a bottom shell 110 and a middle shell 120 connected to each other. The bottom shell 110 and the middle shell 120 surround each other to form a receiving cavity. The middle shell 120 has a paper tray. The receiving cavity communicates with the paper tray. Flanges are provided on both side walls of the middle shell 120 along a first direction. The flanges are provided with clearance holes 104 through them along a third direction.

[0056] Please see Figure 1 As shown, the housing 100 is composed of a bottom shell 110 and a middle shell 120 that are detachably connected. After the bottom shell 110 and the middle shell 120 are connected, they form a receiving cavity for accommodating and installing the machine core 200. This receiving cavity is connected to the paper tray so that when the tray cover 300 rotates toward the middle shell 120, the rotating support member 401 of the rubber roller 400 can extend into the mounting groove 201.

[0057] In this embodiment, in order to facilitate the removal of the printer, flanges are provided on both sides of the middle shell 120. In order to prevent the flanges from blocking the rotating arm 320 when it rotates, clearance holes 104 are provided through the flanges to achieve clearance for the rotating arm 320.

[0058] In some embodiments, the rubber roller 400 includes a rotating shaft 410 and a roller body 420. The roller body 420 is disposed in the middle of the rotating shaft 410. Along the axial direction, the length of the roller body 420 is less than that of the rotating shaft 410. Rotary support members 401 are provided at both ends of the rotating shaft 410. A driven wheel 430 is provided at one end of the rotating shaft 410 along the axial direction. The driven wheel 430 is connected to the drive wheel 231 in a transmission connection.

[0059] Please see Figure 7 and Figure 8 As shown, the driven wheel 430 is connected to the rotating column 321, thereby driving the rotating shaft 410 to rotate, which in turn drives the roller 420 to rotate, so that the roller 420 can drive the paper in the paper tray to be fed to the print head 220 for printing.

[0060] In order to provide sufficient installation space for the rotating support 401 and the driven wheel 430, the axial length of the roller body 420 is less than the axial length of the rotating shaft 410. That is, the two rotating supports 401 are respectively installed at both ends of the rotating shaft 410, and the driven wheel 430 is installed at one end of the rotating shaft 410.

[0061] In some embodiments, the limiting groove 311 has an opening 312, and an elastic arm is formed between the opening 312 and the sidewall of the protrusion 310. The diameter of the limiting groove 311 is D1, the diameter of the rotating shaft 410 is D2, and the maximum length of the opening 312 is L, satisfying: L < D2 < D1.

[0062] Please see Figure 6 and Figure 8 As shown, in order to prevent the rubber roller 400 from detaching from the convex plate 310 and to ensure that the rubber roller 400 can rotate relative to the convex plate 310, the diameter of the rotating shaft 410 needs to be smaller than the diameter of the limiting groove 311. This ensures that the rotating shaft 410 will not interfere with the convex plate 310 when it rotates. In the rotating state, the rotating shaft 410 and the limiting groove 311 are coaxial.

[0063] Furthermore, in order to prevent the entire rubber roller 400 from separating from the convex plate 310, i.e., to prevent the rotating shaft 410 from disengaging from the limiting groove 311, the maximum length of the opening 312 should be less than the diameter of the rotating shaft 410. This achieves the limitation of the rotating shaft 410 located in the limiting groove 311, preventing the rotating shaft 410 from disengaging from the limiting groove 311. Furthermore, the convex plate 310 has a certain elasticity. Specifically, the convex plate 310 can be made of plastic and can undergo a certain elastic deformation. The part between the opening 312 and the side wall of the convex plate 310 is an elastic arm. During the process of the rotating shaft 410 entering the limiting groove 311, the rotating shaft 410 provides a resistance force to the elastic arm, thereby causing the elastic arm to deform and enlarge the opening 312, so that the rotating shaft 410 can smoothly enter the limiting groove 311 and complete the installation of the rotating shaft 410.

[0064] This application also provides a printer that includes the opening and closing cover structure described above.

[0065] The working process of this utility model is as follows: In the initial state, the cover 300 is engaged with the mounting holes 101 on the side walls of the housing 100 via the rotating columns 321 on the rotating arms 320 on both sides, so that the cover 300 can rotate around the rotating columns 321, thereby opening or closing the paper compartment. The rubber roller 400 is installed in the limiting grooves 311 of the protrusions 310 on both sides of the cover 300 via the rotating shaft 410. The limiting groove 311 has an opening 312, which forms an elastic arm with the side wall of the protrusion 310, so that the rotating shaft 410 can squeeze the opening 312 into the limiting groove 311 during installation, and is restricted from falling off after entering the position by the elastic arm. At the same time, the diameter D1 of the limiting groove 311 is larger than the diameter D2 of the rotating shaft 410, allowing the rubber roller 400 to rotate freely in the limiting groove 311. When the tray cover 300 is closed, the tray cover 300 rotates toward the housing 100, causing the rotating support members 401 at both ends of the rubber roller 400 to enter the mounting grooves 201 on both sides of the core 200. The first inclined guide surface 203 on the side wall of the mounting groove 201 guides the rotating support member 401 to enter smoothly. After the rotating support member 401 overcomes the elastic force of the elastic member 202 in the mounting groove 201, the elastic member 202 abuts against the circumferential surface of the rotating support member 401, fixing it in the mounting groove 201, thereby keeping the tray cover 300 closed. At this time, the rotating drive member 230 of the core 200 is connected to the driven wheel 430 at one end of the rubber roller 400 through the drive wheel 231, driving the rubber roller 400 to rotate. The roller body 420 of the rubber roller 400 contacts the paper and is transported to the print head 220 for printing. When it is necessary to open the cover 300, the user applies external force to the protrusions 301 or grooves 302 on both sides of the cover 300 to overcome the elastic force of the elastic element 202, so that the rotating support 401 is disengaged from the mounting groove 201, and the cover 300 can be rotated outward to open the paper compartment.

[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An opening and closing cover structure having a first direction, a second direction, and a third direction that are perpendicular to each other, characterized in that, include: A housing (100) having a paper tray; The movement (200) is fixedly installed on the housing (100). The movement (200) has mounting grooves (201) on both sides along the first direction. Each mounting groove (201) has an elastic element (202) on one side along the second direction. A storage compartment cover (300) is rotatably mounted on the housing (100). The storage compartment cover (300) is used to cover the paper compartment. The storage compartment cover (300) has protruding plates (310) on both sides along the first direction. The protruding plates (310) are located at the ends of the storage compartment cover (300) along the second direction. The protruding plates (310) extend along the third direction. Each protruding plate (310) has a limiting groove (311). The two limiting grooves (311) are coaxially arranged. The storage compartment cover (300) also has protrusions (301) on both side walls along the first direction. A rubber roller (400) has two ends respectively disposed in two limiting grooves (311), a protruding plate (310) sleeved on both ends of the rubber roller (400), and a rotating support member (401) is also provided at both ends of the rubber roller (400). The rotating support member (401) extends into the mounting groove (201), and the elastic member (202) abuts against the circumferential surface of the rotating support member (401).

2. The opening and closing cover structure according to claim 1, characterized in that: The side wall of the mounting groove (201) is provided with a first inclined guide surface (203).

3. The opening and closing cover structure according to claim 1, characterized in that: The cover (300) is provided with grooves (302) on both sides of the first direction, and the protrusion (301) is provided on the bottom wall of the groove (302).

4. The opening and closing cover structure according to claim 1, characterized in that: The mechanism (200) includes a bracket (210), on which a print head (220) is provided. The bracket (210) has mounting grooves (201) at both ends along the first direction. A rotary drive component (230) is also fixedly installed on the bracket (210). The rotating end of the rotary drive component (230) is provided with a drive wheel (231), which is connected to the rubber roller (400) in a transmission connection.

5. The opening and closing cover structure according to claim 1, characterized in that: Rotating arms (320) are fixedly provided on both sides of the cover (300), and rotating columns (321) are fixedly provided on the sides of the two rotating arms (320) that are close to each other. Mounting holes (101) are provided on both sides of the housing (100), and the rotating columns (321) extend at least partially into the mounting holes (101) on the same side.

6. The opening and closing cover structure according to claim 5, characterized in that: The housing (100) is further provided with clearance grooves (102) on both side walls along the first direction. The clearance grooves (102) extend to the mounting holes (101), and a second inclined guide surface (103) is provided between the clearance grooves (102) and the mounting holes (101).

7. The opening and closing cover structure according to claim 1, characterized in that: The housing (100) includes a bottom shell (110) and a middle shell (120) connected to each other. The bottom shell (110) and the middle shell (120) surround each other to form a receiving cavity. The middle shell (120) has the paper tray. The receiving cavity is in communication with the paper tray. The middle shell (120) has flanges on its two side walls along a first direction. The flanges have clearance holes (104) that pass through them along a third direction.

8. The opening and closing cover structure according to claim 4, characterized in that: The rubber roller (400) includes a rotating shaft (410) and a roller body (420). The roller body (420) is located in the middle of the rotating shaft (410) along the axial direction. The length of the roller body (420) is less than that of the rotating shaft (410). The rotating support member (401) is provided at both ends of the rotating shaft (410). A driven wheel (430) is provided at one end of the rotating shaft (410) along the axial direction. The driven wheel (430) is connected to the driving wheel (231) in a transmission connection.

9. The opening and closing cover structure according to claim 8, characterized in that: The limiting groove (311) has an opening (312), and an elastic arm is formed between the opening (312) and the side wall of the protrusion plate (310). The diameter of the limiting groove (311) is D1, the diameter of the rotating shaft (410) is D2, and the maximum length of the opening (312) is L, satisfying: L < D2 < D1.

10. A printer, characterized in that, The opening and closing cover structure includes any one of the above 1 to 9.

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