Printer

Abstract

A printer structurally comprises an upper cover and a lower shell, one end of the upper cover is provided with a first shaft hole, one end of the lower shell is provided with a second shaft hole corresponding to the first shaft hole, and the first shaft hole and the second shaft hole are aligned to allow a rotating shaft to penetrate through. The upper cover is rotatably connected relative to the lower shell; an elastic arm is arranged on the side, located on the first shaft hole, of the upper cover or the side, located on the second shaft hole, of the lower shell, the elastic arm at least partially shields the first shaft hole or the second shaft hole, and the rotating shaft is used for extruding the elastic arm to penetrate through the first shaft hole or the second shaft hole; according to the scheme, the rotating shaft on the printer is not easy to fall off, so that the problem that the rotating shaft of the printer is easy to loosen due to abrasion and even falls off from the shaft hole can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of printers, and in particular to a printer whose rotating shaft is not easily detached. Background Art

[0002] Printers are widely used printing tools in offices, and thermal printers are small and portable printing devices.

[0003] Currently, the upper and lower housings of thermal printers are typically connected by a rotating shaft extending through a shaft hole, enabling the upper and lower housings to be opened and closed. However, in existing designs, for ease of installation, both ends of the rotating shaft are typically exposed. This results in the rotating shaft becoming loose due to wear and tear over time, and even falling out of the shaft hole. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a printer with a rotating shaft that is not easy to fall off, so as to solve the problem that the rotating shaft of the printer is easy to loosen due to wear and even fall off from the shaft hole.

[0005] In order to solve the above technical problems, the technical solution adopted in the present application is: a printer, the structure of which includes an upper cover and a lower shell, one end of the upper cover is provided with a first axial hole, and one end of the lower shell is provided with a second axial hole corresponding to the first axial hole, the first axial hole and the second axial hole are aligned for the passage of the rotating shaft, so that the upper cover can be rotatably connected relative to the lower shell; the upper cover is located on one side of the first axial hole or the lower shell is located on one side of the second axial hole. An elastic arm is provided, and the elastic arm at least partially blocks the first axial hole or the second axial hole, and the rotating shaft is used to squeeze the elastic arm to pass through the first axial hole or the second axial hole.

[0006] When the cam is in the first and second positions, the spring forces the cam to move in a direction that is perpendicular to the axis of the shaft and, when the cam is in the second position, the spring forces the cam to move in a direction that is perpendicular to the axis of the shaft and, when the cam is in the second position, the spring forces the cam to move in a direction that is perpendicular to the axis of the shaft and, when the cam is in the second position, the spring forces the cam to move in a direction that is perpendicular to the axis of the shaft and, when the cam is in the second position, the spring forces the cam to move in a direction that is perpendicular to the axis of the shaft and, when the cam is in the

[0007] Furthermore, a hinge block is provided on the upper cover, and the first axial hole is provided on the hinge block; correspondingly, a hinge groove for accommodating the hinge block is provided on the lower shell, and the second axial hole is provided on the groove wall of the hinge groove; adopting this structure, an effective rotational connection between the upper cover and the lower shell can be achieved, and the hinge block is accommodated in the hinge groove opened in the lower shell without taking up additional space.

[0008] Furthermore, a limiting plate is provided on the side of the second shaft hole of the lower shell or the side of the first shaft hole of the upper cover, and the limiting plate is used to abut against the end face of the rotating shaft away from the elastic arm; with this structure, after the rotating shaft is plugged and assembled into place, one axial end thereof is abutted by the elastic arm and the other end is abutted by the limiting plate, so that the axial direction of the rotating shaft does not shift, thereby achieving a stable limiting effect to maintain the stability of the rotating shaft connection.

[0009] Furthermore, the distance between the limit plate and the adjacent first axial hole or the second axial hole is not greater than the axial length of the rotating shaft, and the distance between the elastic arm and the adjacent first axial hole or the second axial hole is not greater than the axial length of the rotating shaft; this structure is adopted to prevent the rotating shaft from escaping from the gap formed between the above-mentioned components, so as to ensure that the rotating shaft can always be passed through the first axial hole and the second axial hole, thereby realizing a stable rotatable connection between the upper cover and the lower shell.

[0010] Furthermore, two of the first axial holes and the second axial holes are provided, which are respectively provided on the corresponding hinge blocks and the groove walls at both ends in the width direction of the hinge groove, and the two first axial holes and the second axial holes are coaxially arranged; with this structure, in the process of flipping the upper cover and the upper shell relative to the lower shell, the flipping is more stable and smooth.

[0011] Furthermore, a locking structure is provided between the hinge block and the hinge groove, and the locking structure is used to position the upper cover after it is flipped relative to the lower shell. With this locking structure, when the upper cover and the upper shell are flipped 90 degrees relative to the lower shell around the rotation axis, the locking structure will lock and position the upper cover and the lower shell at this state, so that the paper clamping structure on the lower shell can be clamped without holding the upper cover and the upper shell, freeing both hands.

[0012] Furthermore, the locking structure includes a second protrusion arranged at the lower part of the hinge block, and an elastic clip arranged on the groove wall extending in the width direction of the hinge groove. After the upper cover is rotated around the rotation axis at a suitable angle, the second protrusion is engaged with the elastic clip; by adopting this structure, the second protrusion and the elastic clip are locked and positioned, thereby achieving the positioning of the upper cover after it is flipped relative to the lower shell at a suitable angle.

[0013] Furthermore, a sliding groove is provided on the lower shell along the rotation trajectory of the second protrusion, the sliding groove passes through the thickness direction of the lower shell, and the elastic clip is provided at the tail end of the sliding groove; with this structure, when the upper cover and the upper shell are flipped relative to the lower shell around the rotation axis, the second protrusion slides and rotates upward in the sliding groove, and since the sliding groove is provided along the thickness direction of the lower shell, the second protrusion will not generate contact friction with the lower shell during the rotation process, thereby reducing the wear between the two, and when sliding to the position of the elastic clip, the second protrusion pushes the elastic clip to deform backward, so that the second protrusion passes over the engaging position of the elastic clip, and then the elastic clip is reset to achieve abutment with the second protrusion.

[0014] Furthermore, the elastic buckle includes a connecting portion connected to the lower shell body, a buckle located at the tail end of the connecting portion, and a guide slope is provided on the buckle. With this structure, when the second protrusion contacts the elastic buckle, it contacts the guide slope, and under the guidance of the guide slope, it is easier to pass over the buckle and then abut against the upper end face of the buckle to achieve snap-on positioning.

[0015] Furthermore, the upper end of the connecting part is integrally connected to the lower shell, and a distance is provided between the left and right sides and the lower end of the connecting part and the lower shell; with this structure, the elastic clip is integrally connected to the lower shell only through the upper end, because the integral setting has sufficient connection firmness, and the other directions are suspended in the air, which is more conducive to the deformation of the elastic clip to effectively cooperate with the second protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the printer in the closed state.

[0017] Figure 2 This is a schematic diagram of the structure of the printer after removing the upper shell and upper cover for this application.

[0018] Figure 3 This is a structural schematic diagram of a longitudinal cross-sectional view of the printer in the closed state of this application.

[0019] Figure 4 This is a structural schematic diagram of a cross-sectional view of the printer in the flip cover state of this application.

[0020] Figure 5 For this application Figure 4 Structural diagram of a partially enlarged view.

[0021] Figure 6 This is a structural schematic diagram of a width-direction cross-sectional view of the printer in the closed state of this application.

[0022] Figure 7 This is a structural diagram of the exploded view of the printer in this application.

[0023] Figure 8 This is a structural diagram of the upper cover of this application.

[0024] Figure 9 This is a structural diagram of the lower shell of this application.

[0025] Figure 10 This is a structural diagram of the local structure of the lower shell.

[0026] As shown in the accompanying drawings: 1. upper shell, 2. upper cover, 201. first axial hole, 202. elastic arm, 203. hinge block, 204. first protrusion, 205. second protrusion, 3. lower shell, 301. second axial hole, 302. hinge groove, 303. limiting plate, 304. elastic buckle, 305. slide groove, 306. connecting part, 307. buckle, 308. guide slope, 4. rotating axis. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the embodiments and drawings. Obviously, the embodiments described are only preferred embodiments, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] It should also be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component fixed through the intermediate component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] It should be noted that, as Figure 1-2In the embodiment of the present invention, the upward extension direction of the printer height is set as the y direction, and the upward and downward extension along the y direction is called the upper and lower directions. The width extension direction of the printer is set as the z direction, and the directions extending forward and backward in the z direction are called the front and rear directions. The length extension direction of the printer is set as the x direction, and the directions extending along the x direction are called the left and right directions. X, Y and Z are perpendicular to each other to form a three-dimensional space. The upper and lower, left and right, and front and rear directions involved in the specific embodiments of the present application are uniformly attached. Figure 1-2 The x, y, and z coordinates marked in 7 are used as the reference.

[0030] As attached Figure 1-10 The figure shows a printer of the present application, which includes an upper housing 1, an upper cover 2, and a lower housing 3. The upper housing 1 and the upper cover 2 can be snap-connected to each other and can be flipped open relative to the lower housing 3 as a whole. A first shaft hole 201 is provided at one end of the upper cover 2, and a second shaft hole 301 corresponding to the first shaft hole 201 is provided at one end of the lower housing 3. The first shaft hole 201 and the second shaft hole 301 are aligned to allow the rotation shaft 4 to pass through, so that the upper cover 2 can be rotatably connected relative to the lower housing 3.

[0031] The upper cover 2 is located on one side of the first axis hole 201 or the lower shell 3 is located on one side of the second axis hole 301, and an elastic arm 202 is provided. The elastic arm 202 at least partially blocks the first axis hole 201 or the second axis hole 301, that is, the projection formed by the elastic arm 202 on the axis hole along the axial direction of the axis hole at least partially blocks the axis hole, and the rotating shaft 4 is used to squeeze the elastic arm 202 to pass through the first axis hole 201 or the second axis hole 301. In this way, when assembling the rotating shaft 4, force is applied to the rotating shaft 4 to squeeze the elastic arm 202, so that the elastic arm 202 shrinks to the first axis hole 201 or the second axis hole 301 and is exposed to facilitate the installation of the rotating shaft 4. The above definition can be specifically realized as follows: when the rotating shaft 4 passes through the first shaft hole 201 or the second shaft hole 301, the rotating shaft 4 pushes the elastic arm 202, causing the elastic arm 202 to deform; when the rotating shaft 4 is inserted into the first shaft hole 201 and the second shaft hole 301 and assembled in place, the rotating shaft 4 is released from pushing the elastic arm 202, and the elastic arm 202 is reset, so that the end face of the rotating shaft 4 close to the elastic arm 202 abuts against the side face of the elastic arm 202. The elastic arm 202 is a structural component with a certain elastic restoring force and deformation force. Under the action of the pushing force of the rotating shaft 4, the elastic arm 202 can be retracted to the first shaft hole 201 or the second shaft hole 301 to be exposed. After the rotating shaft 4 is released, it can automatically reset, and at this time, its side face can abut against the end face of the rotating shaft 4.

[0032] When the cam is in the first and second positions, the spring forces the cam to move in a direction that is perpendicular to the axis of rotation and which will cause ...

[0033] As an example, the attached Figure 6-7 As shown, the elastic arm 202 is located on the inner side of the first axis hole 201 and is provided on the upper cover 2; the second axis hole 301 is located at the outer end of the first axis hole 201. When assembling the rotating shaft 4, it is plugged and assembled from the inner end of the first axis hole 201 toward the second axis hole 301. At this time, the rotating shaft 4 and the lower surface of the elastic arm 202 abut against each other and push each other. Due to the above-mentioned mutual abutment and pushing force, the rotating shaft 4 will not fall off during the assembly process.

[0034] As another example, the elastic arm 202 of the present application can also be set on the lower shell body 3. At this time, the rotating shaft 4 can be inserted from the outer end side of the second shaft hole 301 toward the direction of the first shaft hole 201. During the insertion process, one end of the rotating shaft 4 and the lower surface of the elastic arm 202 abut against each other and push each other. Due to the above-mentioned mutual abutment and pushing force, the rotating shaft 4 will not fall off during the assembly process; the above-mentioned scheme is not shown in the accompanying drawings, but is used as an illustration of the scope of protection of the present application, that is, the elastic arm 202 of the present application is not only set on the upper cover 2, but can also be set on the lower shell body 3. As long as it can generate a pushing force on the rotating shaft 4 during the assembly process and will not cause it to slip, the scheme is applicable to the present application.

[0035] As attached Figure 7 、 8 and Figure 10As shown, the upper cover 2 described in the present application is provided with a hinge block 203, and the first axial hole 201 is provided on the hinge block 203; the corresponding lower shell 3 is provided with a hinge groove 302 for accommodating the hinge block 203, and the second axial hole 301 is provided on the hinge groove 302 located on the groove walls provided at both ends in the width direction of the printer; adopting the above structure, by providing a downwardly concave hinge groove 302 at one end in the length direction of the lower shell 3, and providing a downwardly protruding hinge block 203 at the corresponding end of the upper cover 2, the first axial hole 201 is provided on the hinge block 203, and the second axial hole 301 is provided on the groove walls at both ends in the width direction of the hinge groove 302, so that the two are more convenient to assemble when they rotate and cooperate, and no extra space is occupied.

[0036] As attached Figure 6 and Figure 8 As shown, the lower bottom surface of the elastic arm 202 described in the present application is provided with a first protrusion 204 extending downward, and the first protrusion 204 is used to abut against the rotating shaft 4, that is, the first protrusion 204 is close to the bottom surface position of the front end of the elastic arm 202. It can be a whole first protrusion 204 extending along the length direction of the elastic arm 202, that is, in a direction parallel to the axial direction of the rotating shaft 4, or a protrusion structure arranged at intervals. In this way, its side surface will abut against the proximal end surface of the rotating shaft 4 after the rotating shaft 4 is plugged and assembled into place. With this structure, a fulcrum can be formed when the rotating shaft 4 pushes the elastic arm 202, which makes it easier to push it upward and deform. There is no need to set the entire elastic arm 202 to be very thick. It is only necessary for the first protrusion 204 to extend downward by a certain thickness, and after resetting, a larger area of side surface is formed, which is more conducive to a firm abutment against the end surface of the rotating shaft 4.

[0037] The lower shell 3 described in the present application is located on one side of the second shaft hole 301 or the upper cover 2 is located on one side of the first shaft hole 201. A limit plate 303 is provided. The limit plate 303 is used to abut the end face of the rotating shaft 4 away from the elastic arm 202; that is, both ends of the axial direction of the rotating shaft 4 are abutted. With this structure, after the rotating shaft 4 is plugged and assembled in place, one end of its axial direction is abutted by the elastic arm 202 and the other end is abutted by the limit plate 303, so that the axial direction of the rotating shaft 4 does not shift, and a stable limiting effect is achieved to maintain the stability of the connection of the rotating shaft 4 and prevent it from falling off. Moreover, the setting of the limit plate 303 not only ensures that the rotating shaft 4 is not easily separated from the shaft hole during the assembly process, but also limits the two ends of the rotating shaft 4 after the assembly is completed, making the assembled position of the rotating shaft 4 more stable. Under the premise that there is no external force pushing the elastic arm 202 to deform and separate from the abutment of the end face of the rotating shaft 4, the rotating shaft 4 will not separate from the shaft hole.

[0038] Specifically, as an example, as shown in the attached Figure 6 and Figure 9 As shown, the limiting plate 303 is located on one side of the second axis hole 301 of the lower shell 3, and the elastic arm 202 is located on one side of the first axis hole 201 of the upper cover 2; at this time, the inner end of the rotating shaft 4 is abutted by the side of the elastic arm 202, and the other end is abutted by the limiting plate 303, so that the two ends are limited and it is not easy to fall off.

[0039] As another example, when the elastic arm 202 is close to the side of the second axis hole 301 of the lower shell 3, the limit plate 303 is correspondingly arranged on the side of the upper cover 2 close to the first axis hole 201, so that after the rotating shaft 4 is assembled into place, the end face of this end abuts against the corresponding limit plate 303, and similarly, after the assembly is in place, the axial ends of the rotating shaft 4 are respectively abutted and limited by the elastic arm 202 and the limit plate 303; the above scheme is shown in the figure, but as an illustration of the scope of protection of this application, that is, the limit plate 303 of this application is not only arranged inside the lower shell 3, but can also be arranged on the inner side of the first axis hole 201. As long as the two ends of the rotating shaft 4 can be abutted and limited by the elastic arm 202 and the limit plate 303 after the rotating shaft 4 is assembled, and the scheme that does not cause it to slip is applicable to this application.

[0040] As an example, the distance between the limiting plate 303 described in the present application and the adjacent first shaft hole 201 or the second shaft hole 301 is not greater than the axial length of the rotating shaft 4, and the distance between the elastic arm 202 and the adjacent first shaft hole 201 or the second shaft hole 301 is not greater than the axial length of the rotating shaft 4; specifically, as an example, when the limiting plate 303 is arranged on the side close to the second shaft hole 301, as shown in the attached Figure 6 As shown, at this time, the limit plate 303 is adjacent to the second shaft hole 301, and the elastic arm 202 is adjacent to the first shaft hole 201; as another example, when the limit plate 303 is arranged on one side of the first shaft hole 201, the corresponding elastic arm 202 is arranged close to the second shaft hole 301; adopting the above scheme, when the rotating shaft 4 is inserted into the shaft hole, even if the two ends of the rotating shaft 4 are not abutted by the limit plate 303 and the elastic arm 202, it will not fall off from the gap between the limit plate 303 and the adjacent shaft hole or from the gap between the elastic arm and the adjacent shaft hole, and it will still be sleeved in the two shaft holes, realizing the rotational connection between the upper cover 2 and the lower shell 3.

[0041] As attached Figure 7As shown, the first axial hole 201 and the second axial hole 301 described in the present application are both provided with two, which are respectively provided on the corresponding hinge blocks 203 and hinge grooves 302 on the groove walls provided at both ends along the width direction of the printer, and the two first axial holes 201 and the second axial holes 301 are provided coaxially; that is, the two axial holes at the same end are aligned with each other and coaxially, and the hole diameters are also the same, so as to adapt to the outer diameter of the rotating shaft 4, so as to facilitate the rotating shaft 4 of the through-axis structure to fit into the two axial holes. With this structure, in the process of flipping the upper cover 2 and the upper shell 1 relative to the lower shell 3, the flipping is more stable and smooth; the first axial hole 201 of the present application is located on the inner side of the second axial hole 301.

[0042] As attached Figure 3-4 and Figure 8-9 As shown, a locking structure is provided between the hinge block 203 and the hinge slot 302 of the present application, and the locking structure is used to position the upper cover 2 after it is flipped relative to the lower shell 3. For example, after the upper cover 2 is flipped 90 degrees or other suitable angles relative to the lower shell 3, the locking structure at this time realizes the fixation of the state after the flipping angle, so that the paper clamping structure on the lower shell 3 can be clamped without holding the upper cover 2 and the upper shell 1, freeing both hands.

[0043] As attached Figure 3-4 and Figure 8-9 As shown, the latching structure described in the present application includes a second protrusion 205 provided at the lower part of the hinge block 203, and an elastic snap 304 provided on the slot wall of the hinge slot 302 extending along the width direction of the printer. After the upper cover 2 is rotated around the rotating shaft 4 by a suitable angle, such as 90 degrees, the second protrusion 205 is engaged with the elastic snap 304. At this time, the upper shell 1 and the upper cover 2 are flipped open 90 degrees relative to the lower shell 3, and this state is fixed by the engagement of the second protrusion 205 and the elastic snap 304. For details, please refer to the attached Figure 3-4 and Figure 6-7 As shown in FIG, the position where the second protrusion 205 is provided on the upper cover 2 is the hinge block 203 extending downward, the tail end of the hinge block 203 is arc-shaped, and a corresponding hinge groove 302 is provided on the lower shell 3. The extension arc of a groove wall of the hinge groove 302 extending along the width direction of the printer is adapted to the arc of the hinge block 203. Then, during the flipping process, the second protrusion 205 runs along the extension direction of the groove wall until it slides to the position of the elastic buckle 304 to realize the snap-fit positioning. The state at this time is shown in FIG. Figure 4 When the cover needs to be closed, the upper shell 1 and the upper cover 2 rotate in opposite directions around the rotation axis 4 to cover the lower shell 3. During this process, the second protrusion 205 will push the elastic buckle 304 back to achieve separation between the two, thereby restoring the initial covering state, that is, the attached Figure 3 The status shown.

[0044] As attached Figure 7 and Figure 10 As shown, the lower shell 3 described in the present application is provided with a slide groove 305 along the rotation track of the second protrusion 205. The slide groove 305 penetrates along the thickness direction of the lower shell 3, that is, a through-type slide groove 305 structure, and the elastic buckle 304 is provided at the tail end of the slide groove 305, which is the position where the second protrusion 205 is located after the cover is rotated to open. With this structure, when the upper cover 2 and the upper shell 1 are turned 90 degrees relative to the lower shell 3 around the rotation axis 4, the second protrusion 205 is rotated. The second protrusion 205 slides in the slide groove 305 and rotates upward. Since the slide groove 305 is provided along the thickness direction of the lower shell 3, no contact friction occurs between the second protrusion 205 and the lower shell 3 during the rotation process, thereby reducing wear between the two. When the second protrusion 205 slides to the position of the elastic buckle 304, the second protrusion 205 pushes the elastic buckle 304 backward to deform, so that the second protrusion 205 passes over the engaging position of the elastic buckle 304. Then, the elastic buckle 304 returns to its original position and contacts the second protrusion 205.

[0045] As attached Figure 7 and Figure 10 As shown, the elastic snap fastener 304 described in the present application includes a connecting portion 306 connected to the lower shell body 3, and a snap fastener 307 located at the tail end, i.e., the lower end, of the connecting portion 306. A guide slope 308 is provided on the snap fastener 307, and the inclination direction of the guide slope 308 here gradually approaches the side of the second protrusion 205. With this structure, when the second protrusion 205 contacts the elastic snap fastener 304, that is, contacts the guide slope 308, it is easier to cross the snap fastener 307 under the guidance of the guide slope 308 and then abut against the upper end face of the snap fastener 307 to achieve snap-in positioning.

[0046] As an example, the attached Figure 7 and Figure 10 As shown, the upper end of the connecting portion 306 described in the present application is integrally connected to the lower shell 3, and a distance is set between the left and right sides and the lower end of the connecting portion 306 and the lower shell 3, that is, it is only connected to the lower shell 3 through the upper end, and the two can be prepared by integral molding; because the integrated setting has sufficient connection firmness, and the other directions are suspended in the air, it is more conducive to the deformation of the elastic buckle 304 to effectively cooperate with the second protrusion 205.

[0047] The shell of the present application can be made of plastic injection molding, and the rotating shaft of the present application can be made of a steel shaft to improve its strength and stability. The other components are conventional component structures of printers or thermal printers and do not need to be described in detail here; the most critical innovation of the present application is that the elastic arm can be pressed with the rotating shaft through the setting of the elastic arm, so that the rotating shaft is limited during assembly and subsequent use and is not easy to fall off; in addition, a card connection structure is set between the upper cover and the lower shell to fix the angle after the flip cover, thereby freeing both hands and achieving more convenient paper clamping operation.

[0048] The specific working principle and process of the printer of the present application are as follows: first, assemble the various driving parts and rubber rollers, paper pressing parts, paper clamping mechanisms and other parts required for the thermal printer in the shell to the corresponding positions; then assemble the upper shell, upper cover and lower shell according to the assembly sequence, wherein the specific assembly process of the rotating shaft is as follows: Figure 1-10 The structure shown is used as an illustration: insert one end of the rotating shaft into the first shaft hole of the upper cover by means of a clamping tool such as tweezers. At this time, the inner end of the rotating shaft is located below the elastic arm and pushes against the elastic arm, so that the elastic arm is deformed upward under the extrusion of the rotating shaft, thereby limiting the rotating shaft. With this extrusion force, the rotating shaft can be prevented from falling during the assembly process, thereby improving production efficiency and saving labor costs. Then continue to apply force to the end face of the rotating shaft by means of tweezers, so that the rotating shaft is inserted into the second shaft hole on the lower shell body while passing through the first shaft hole and the lower shell body. At this time, the inner end of the rotating shaft is separated from the bottom of the elastic arm, and the elastic arm is released. The lever arm is reset downward until the rotating shaft is plugged and assembled in place. At this time, the side surface of the elastic arm abuts against the inner end surface of the rotating shaft, and the other end of the rotating shaft is abutted and limited by the limit plate provided in the lower shell, thereby axially fixing the rotating shaft in the two shaft holes, realizing the rotational connection between the upper shell, the upper cover and the lower shell, and the upper shell and the upper cover can be flipped open and closed around the rotating shaft; after the upper cover and the lower shell are installed, if the cover is opened 90 degrees, the second protrusion provided on the lower part of the upper cover will rotate to the elastic buckle position and abut and engage with the buckle. At this time, the cover is opened 90 degrees and is locked, which is convenient for operations such as clamping paper.

Claims

1. A printer, comprising an upper cover (2) and a lower housing (3), characterized in that: One end of the upper cover (2) is provided with a first axial hole (201), and one end of the lower shell (3) is provided with a second axial hole (301) corresponding to the first axial hole (201), and the first axial hole (201) and the second axial hole (301) are aligned to allow the rotation shaft (4) to pass through, so that the upper cover (2) can be rotatably connected relative to the lower shell (3); The upper cover (2) is located on one side of the first axial hole (201) or the lower shell (3) is located on one side of the second axial hole (301) and is provided with an elastic arm (202), the elastic arm (202) at least partially blocks the first axial hole (201) or the second axial hole (301), and the rotating shaft (4) is used to squeeze the elastic arm (202) so as to pass through the first axial hole (201) or the second axial hole (301).

2. The printer according to claim 1, wherein: The upper cover (2) is provided with a hinge block (203), and the first axial hole (201) is provided on the hinge block (203); the corresponding lower shell (3) is provided with a hinge groove (302) for accommodating the hinge block (203), and the second axial hole (301) is provided on the groove wall of the hinge groove (302).

3. The printer according to claim 1, wherein: A limit plate (303) is provided on the side of the lower shell (3) located at the second shaft hole (301) or the side of the upper cover (2) located at the first shaft hole (201), and the limit plate (303) is used to abut against the end face of the rotating shaft (4) away from the elastic arm (202).

4. The printer according to claim 3, wherein: The distance between the limiting plate (303) and the adjacent first axial hole (201) or the second axial hole (301) is not greater than the axial length of the rotating shaft (4), and the distance between the elastic arm (202) and the adjacent first axial hole (201) or the second axial hole (301) is not greater than the axial length of the rotating shaft (4).

5. The printer according to claim 2, wherein: The first axial hole (201) and the second axial hole (301) are both provided in pairs, and are respectively provided on the groove walls at both ends of the width direction of the corresponding hinge block (203) and the hinge groove (302), and the two first axial holes (201) and the second axial holes (301) are provided coaxially.

6. The printer according to claim 2, wherein: A locking structure is provided between the hinge block (203) and the hinge slot (302), and the locking structure is used for positioning the upper cover (2) after it is flipped over relative to the lower shell (3).

7. The printer according to claim 6, wherein: The locking structure comprises a second protrusion (205) provided at the lower part of the hinge block (203), and an elastic buckle (304) provided on the groove wall extending along the width direction of the hinge groove (302); after the upper cover (2) is rotated around the rotating shaft (4) to a suitable angle, the second protrusion (205) is locked with the elastic buckle (304).

8. The printer according to claim 7, wherein: A slide groove (305) is provided on the lower shell (3) along the rotation track of the second protrusion (205), and the slide groove (305) penetrates along the thickness direction of the lower shell (3), and the elastic buckle (304) is provided at the tail end of the slide groove (305).

9. The printer according to claim 8, wherein: The elastic buckle (304) comprises a connecting portion (306) connected to the lower shell (3), a buckle (307) located at the tail end of the connecting portion (306), and a guiding inclined surface (308) is provided on the buckle (307).

10. The printer according to claim 9, wherein: The upper end of the connecting portion (306) is integrally connected to the lower shell (3), and a distance is provided between the left and right sides and the lower end of the connecting portion (306) and the lower shell (3).

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