Printer

Abstract

The printer comprises a machine body, the machine body comprises a cover body and a base, locking assemblies are arranged on the two sides of the cover body in the width direction of the machine body, each locking assembly comprises a locking piece, the cover body is rotationally connected with the base, a locking groove is formed in the base, and the locking pieces can be connected with the locking grooves in a clamped mode so as to limit rotation of the cover body relative to the base; wherein the two locking assemblies are relatively independent. In the invention, when the locking piece is clamped with the locking groove, the cover body keeps a state of buckling the base, namely, the locking assembly can enable the machine body to be stably in a closed state. The two locking assemblies can be respectively clamped with the locking groove, so that the two locking assemblies do not influence each other, and the situation that one locking assembly is clamped with the locking groove and the other locking assembly cannot be clamped with the locking groove is avoided, so that the cover body can accurately buckle the base, the structure of the printer in the left-right direction is balanced, and the service life of the printer is prolonged. And the printing quality of the printer is ensured.

Description

Technical Field

[0001] This application relates to the field of printing technology, and particularly to a printer. Background Art

[0002] A printer has a cover and a base. There are two locking mechanisms provided on the cover, and the two locking mechanisms are connected by a rotating shaft. When the rotating shaft is deformed due to production errors or use, a situation may occur where one of the locking mechanisms fails to lock in place, resulting in the cover not being accurately latched onto the base, a gap appearing between the cover and the base, affecting the balance of the printer in the left-right direction and the printing quality. Summary of the Utility Model

[0003] This application provides a printer for solving the problem that the cover cannot be accurately latched onto the base.

[0004] A printer provided by an embodiment of this application includes a body, and the body includes: a cover and a base. Along the width direction of the body, locking components are provided on both sides of the cover, and the locking components include locking members; the cover is rotatably connected to the base, and a locking groove is provided on the base, and the locking member can be engaged with the locking groove to limit the rotation of the cover relative to the base; wherein, the two locking components are relatively independent.

[0005] In a possible design, the cover includes an upper frame, the locking member is rotatably connected to the upper frame, the locking member can rotate between a first position and a second position, when the locking member is in the first position, the locking member can be engaged with the locking groove, and when the locking member is in the second position, the locking member is disengaged from the locking groove.

[0006] In a possible design, the locking member includes a body, a rotating shaft is provided on one of the upper frame and the body, and a rotating hole is provided on the other, and the rotating hole is rotatably connected to the rotating shaft.

[0007] In a possible design, the locking component includes an elastic member, the elastic member is connected to the locking member, and the elastic member can apply a force to the locking member to move from the second position to the first position.

[0008] In a possible design, the elastic member has a first extension arm and a second extension arm, a convex ring and a limiting fan ring are provided on the body, the convex ring is located on the outer periphery of the rotating hole, the elastic member is sleeved on the convex ring, the first extension arm abuts against the limiting fan ring, and the second extension arm abuts against the cover.

[0009] In a possible design, a guiding groove is provided on the upper frame, and a guiding convex portion is provided on the body. When the locking member is in the first position, the guiding convex portion cooperates with the guiding groove.

[0010] In a possible design, the cover body includes an upper shell and a limiting plate connected to the upper shell. The locking member has a limiting convex portion, and the limiting convex portion extends into the space between the limiting plate and the upper shell to limit the movement of the locking member.

[0011] In a possible design, an installation through hole is provided on the cover body. The locking assembly includes a driving member. The driving member has a pressing portion and a connecting shaft. The locking member has a connecting convex portion, and a connecting hole is provided on the connecting convex portion. The connecting shaft passes through the installation through hole and is connected to the connecting hole. When the locking member is in the first position, pressing the pressing portion can apply a force to the locking member to move from the first position to the second position.

[0012] In a possible design, the locking member has a hook portion, and the base is provided with a limiting arm protruding into the locking groove. When the locking member is in the first position, the hook portion abuts against the limiting arm.

[0013] In a possible design, the machine body further includes a ribbon holder, and the cover body is provided with a convex platform, and the convex platform can abut against the ribbon holder.

[0014] In the present application, when the locking member is engaged with the locking groove, the cover body remains in a state of being buckled to the base, that is, the locking assembly can keep the machine body in a stable closed state. Since the two locking assemblies can be respectively engaged with the locking groove, the two locking assemblies do not affect each other, and there will be no situation where one locking assembly is engaged with the locking groove, resulting in the other locking assembly being unable to be engaged with the locking groove, so that the cover body can accurately buckle the base, and the structure of the printer in the left-right direction is balanced, thereby ensuring the printing quality of the printer.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the printer provided by the present application in a specific embodiment, wherein the machine body of the printer is in a closed state;

[0017] Figure 2 is Figure 1 a schematic structural diagram of the machine body of the printer in FIG.

[0018] Figure 3 is Figure 1 a partial cross-sectional view of the printer in FIG.

[0019] Figure 4 is Figure 2 a schematic structural view of the upper-middle frame and the locking component;

[0020] Figure 5 is Figure 4 a partial schematic structural view of the upper-middle frame;

[0021] Figure 6 is Figure 4 a schematic structural view of the locking piece in the middle;

[0022] Figure 7 is Figure 4 a schematic structural view of the elastic piece in the middle;

[0023] Figure 8 is Figure 4 a schematic structural view of the driving piece in the middle;

[0024] Figure 9 is Figure 2 a schematic structural view of the upper shell in the middle;

[0025] Figure 10 is Figure 2 a partial schematic structural view of the cover body in the middle;

[0026] Figure 11 is Figure 2 a partial structural sectional view of the lower-middle frame.

[0027] Reference numerals:

[0028] 1 - machine body;

[0029] 11 - cover body;

[0030] 111 - upper-middle frame;

[0031] 111a - rotating shaft;

[0032] 111b - guiding groove;

[0033] 111c - boss;

[0034] 111d - mounting plate;

[0035] 112 - upper shell;

[0036] 112a - mounting through hole;

[0037] 112b - limiting groove;

[0038] 113 - limiting plate;

[0039] 12 - base;

[0040] 121 - lower-middle frame;

[0041] 121a - Locking groove;

[0042] 121b - Limiting wall

[0043] 122 - Bottom case;

[0044] 123 - Baffle;

[0045] 124 - Pressure roller;

[0046] 13 - Ribbon cassette;

[0047] 14 - Media outlet;

[0048] 2 - Media roll;

[0049] 3 - Locking assembly;

[0050] 31 - Locking member;

[0051] 311 - Body;

[0052] 311a - Rotating hole;

[0053] 311b - Convex ring;

[0054] 311c - Limiting sector ring;

[0055] 311d - Guide convex part;

[0056] 312 - Hook part;

[0057] 313 - Limiting convex part;

[0058] 314 - Connecting convex part;

[0059] 314a - Connecting hole;

[0060] 32 - Elastic member;

[0061] 321 - First extension arm;

[0062] 322 - Second extension arm;

[0063] 33 - Driving member;

[0064] 331 - Pressing part;

[0065] 332 - Connecting shaft;

[0066] 4 - Print head.

[0067] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application and used together with the specification to explain the principles of this application. Detailed implementation manners

[0068] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0069] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0070] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0071] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0072] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0073] The present application provides a printer, as Figure 1 and Figure 2 shown, the printer includes: a body 1, the body 1 includes a cover 11, a base 12 and a ribbon cassette 13, the cover 11 is rotatably connected to the base 12, and the ribbon cassette 13 is disposed therebetween. The body 1 has an open state and a closed state. When the body 1 is in the closed state, the cover 11 covers the base 12, and the ribbon cassette 13 is enclosed between the cover 11 and the base 12; when the body 1 is in the open state, the cover 11 rotates relative to the base 12 to open, so that the ribbon cassette 13 is exposed to the user. The ribbon cassette 13 also has a connecting rod, and the ribbon cassette 13 is rotatably connected to the cover 11 through the connecting rod, so that when the cover 11 rotates relative to the base 12 to open, the ribbon cassette 13 can also rotate and lift relative to the base 12.

[0074] As Figure 2 and Figure 3As shown, along the width direction of the machine body 1, locking components 3 are provided on both sides of the cover body 11. The locking components 3 include locking members 31, and locking grooves 121a are provided on both sides of the base 12. The locking members 31 can be engaged with the locking grooves 121a to limit the rotation of the cover body 11 relative to the base 12; among them, the two locking components 3 are relatively independent.

[0075] When the locking member 31 is engaged with the locking groove 121a, the cover body 11 remains in the state of being buckled to the base 12, that is, the locking component 3 can make the machine body 1 stably in the closed state. Since the two locking components 3 can be respectively engaged with the locking groove 121a, the two locking components 3 do not affect each other, and there will be no situation where one locking component 3 is engaged with the locking groove 121a, resulting in the other locking component 3 not being able to be engaged with the locking groove 121a, so that the cover body 11 can accurately buckle the base 12, and the structure of the printer in the left and right directions is balanced, thereby ensuring the printing quality of the printer. At the same time, there will be no gap between the cover body 11 and the base 12, making the appearance of the printer more beautiful.

[0076] Specifically, as Figure 2 shown, the cover body 11 includes an upper frame 111 and an upper shell 112, and the upper frame 111 is installed on the upper shell 112. As Figure 3 and Figure 4 shown, the locking member 31 is rotatably connected to the upper frame 111. The locking member 31 can rotate between a first position and a second position. When the locking member 31 is in the first position, the locking member 31 can be engaged with the locking groove 121a, that is, the machine body 1 can be in the closed state; when the locking member 31 is in the second position, the locking member 31 is disengaged from the locking groove 121a, that is, the locking member 31 no longer restricts the rotation of the cover body 11 relative to the base 12, and the machine body 1 can be in the open state.

[0077] When the locking member 31 is in the second position, its relative position with respect to the cover body 11 is more forward than when the locking member 31 is in the first position, that is, when the locking member 31 rotates from the first position to the second position, the locking member 31 rotates forward relative to the cover body 11, and when the locking member 31 rotates from the second position to the first position, the locking member 31 rotates backward relative to the cover body 11.

[0078] In addition, as Figure 2 shown, the locking members 31 are located on both sides inside the upper shell 112, and a part of the locking members 31 protrudes from the upper shell 112 to facilitate engagement with the locking grooves 121a.

[0079] More specifically, as Figure 5 and Figure 6As shown, the locking member 31 includes a body 311. One of the upper frame 111 and the body 311 is provided with a rotating shaft 111a, and the other is provided with a rotating hole 311a. The rotating hole 311a is rotatably connected to the rotating shaft 111a, so as to realize the rotational connection between the locking member 31 and the upper frame 111, enabling the locking member 31 to rotate between a first position and a second position.

[0080] Optionally, the upper frame 111 is provided with the rotating shaft 111a, and the body 311 is provided with the rotating hole 311a.

[0081] Optionally, the upper frame 111 is provided with the rotating hole 311a, and the body is provided with the rotating shaft 111a.

[0082] Preferably, for the convenience of connecting the locking member 31 and the upper frame 111, the upper frame 111 has a protruding mounting plate 111d. The rotating shaft 111a or the rotating hole 311a is arranged on the mounting plate 111d, and the body 311 abuts against the mounting plate 111d to improve the stability of the locking member 31 when rotating relative to the upper frame 111.

[0083] In a specific embodiment, as Figure 4 and Figure 6 shown, the locking assembly 3 includes a driving member 33. The locking member 31 has a connecting convex portion 314, and the driving member 33 is connected to the connecting convex portion 314. When the user presses the driving member 33, the driving member 33 drives the locking member 31 to move from the first position to the second position, thereby releasing the clamping state between the locking member 31 and the locking groove 121a.

[0084] It can be understood that the connecting convex portion 314 can be detachably connected to or integrally formed with the body 311.

[0085] Specifically, as Figure 6 and Figure 8 shown, the driving member 33 has a pressing portion 331 and a connecting shaft 332. The connecting convex portion 314 is provided with a connecting hole 314a, and the connecting shaft 332 is connected to the connecting hole 314a. The connecting shaft 332 has a cylindrical portion and a non-cylindrical portion. The connecting hole 314a also correspondingly has a cylindrical portion and a non-cylindrical portion. The cylindrical portion can guide the cooperation between the connecting shaft 332 and the connecting hole 314a, facilitating the assembly of the two. The non-cylindrical portion can limit the rotation of the connecting shaft 332 relative to the connecting hole 314a, enabling the force received by the driving member 33 to be efficiently transmitted to the locking member 31.

[0086] Optionally, the driving member 33 and the connecting convex portion 314 are also connected by fasteners such as screws to ensure the firmness of the connection between the driving member 33 and the connecting convex portion 314.

[0087] Optionally, the non-cylindrical partial cross-section can be in the shape of a runway. The pressing part 331 has an arc surface, enabling the user to easily press the driving part 33.

[0088] More specifically, as Figure 9 shown, an installation through-hole 112a is provided on the cover body 11. The connecting shaft 332 passes through the installation through-hole 112a and is connected to the connecting convex part 314, so that the pressing part 331 can be located outside the cover body 11, and the locking part 31 can be located inside the cover body 11. During the use of the printer, the cover body 11 plays a protective role for the locking part 31, preventing the user and external impacts from touching the locking part 31, thereby effectively preventing the user or other external objects from accidentally touching the locking part 31 and ensuring the reliability of the locking assembly 3 for locking the cover body 11 and the base 12.

[0089] Preferably, a limiting groove 112b is further provided on the cover body 11. The installation through-hole 112a is located in the limiting groove 112b, and the pressing part 331 is installed in the limiting groove 112b. The connecting shaft 332 can move along the installation through-hole 112a, that is, the installation through-hole 112a guides the movement of the connecting shaft 332 and limits its movement range. At the same time, the pressing part 331 can move along the limiting groove 112b, that is, the limiting groove 112b guides the movement of the pressing part 331 and limits its movement range. When the user presses the driving part 33, the installation through-hole 112a and the limiting groove 112b enable the driving part 33 to move only along a preset trajectory, reducing the use difficulty and improving the use experience of the printer.

[0090] Furthermore, as Figure 6 and Figure 10 shown, the cover body 11 further includes a limiting plate 113 connected to the upper shell 112. The locking part 31 has a limiting convex part 313, and the limiting convex part 313 extends into the space between the limiting plate 113 and the upper shell 112 to limit the movement of the locking part 31.

[0091] The limiting convex part 313 is connected to the main body 311, and the limiting convex part 313 can only move in the space between the limiting plate 113 and the upper shell 112, thereby limiting the movement range of the locking part 31 and improving the working reliability of the locking assembly 3.

[0092] It can be understood that the limiting convex part 313 can be detachably connected to or integrally formed with the main body 311.

[0093] Even further, as Figure 5 and Figure 6 shown, the upper frame 111 is provided with a guiding groove 111b, and the main body 311 is provided with a guiding convex part 311d. When the locking part 31 is in the first position, the guiding convex part 311d cooperates with the guiding groove 111b.

[0094] The side wall of the guiding groove 111b close to the locking member 31 is inclined towards the locking member 31. When the locking member 31 rotates from the second position to the first position, the guiding convex portion 311d can gradually extend into the guiding groove 111b along the side wall of the guiding groove 111b, thereby realizing the guiding of the movement of the locking member 31 and fixing the movement path of the locking member 31.

[0095] Meanwhile, when the locking member 31 is in the first position, the guiding groove 111b can also limit the movement of the guiding convex portion 311d, and further limit the movement of the locking member 31 relative to the cover body 11, improving the stability and reliability of the locking assembly 3 to keep the machine body 1 in the closed state.

[0096] In a specific embodiment, as Figure 4 shown, the locking assembly 3 includes an elastic member 32. The elastic member 32 is connected to the locking member 31. The elastic member 32 can apply a force to the locking member 31 to move from the second position to the first position, so that the locking member 31 can be kept in the first position, and further the printer can be kept in the closed state, and the state of the printer during the printing process is relatively stable.

[0097] Specifically, as Figure 6 and Figure 7 shown, the elastic member 32 has a first extension arm 321 and a second extension arm 322. A convex ring 311b and a limiting sector ring 311c are arranged on the main body 311. The convex ring 311b is located on the outer periphery of the rotation hole 311a. The elastic member 32 is sleeved on the convex ring 311b. The first extension arm 321 abuts against the limiting sector ring 311c, and the second extension arm 322 abuts against the cover body 11.

[0098] When the user presses the driving member 33 to rotate the locking member 31 from the first position to the second position, the limiting sector ring 311c pushes the first extension arm 321 closer to the second extension arm 322, and the elastic member 32 is compressed. The compressed elastic member 32 applies a force to the locking member 31 to move from the second position to the first position. Among them, the first extension arm 321 applies a force to the locking member 31 by applying an elastic force to the limiting sector ring 311c.

[0099] When the user no longer presses the driving member 33, the elastic member 32 applies an elastic force to the locking member 31, so that the locking member 31 rotates from the second position to the first position, and at the same time drives the driving member 33 to reset.

[0100] Optionally, when the locking member 31 is in the first position, the elastic member 32 is also in a compressed state, and the degree of compression of the elastic member 32 when the locking member 31 is in the second position is greater than the degree of compression of the elastic member 32 when the locking member 31 is in the first position.

[0101] More specifically, a recessed installation space is formed between the convex ring 311b and the limiting sector ring 311c. The installation space is annular, and a part of the elastic member 32 is installed in the installation space, that is, the convex ring 311b and the limiting sector ring 311c limit the elastic member 32. As Figure 8 shown, the first extension arm 321 has a structure protruding towards the second extension arm 322. The end of the limiting sector ring 311c abuts against the protruding structure, so that the force exerted by the limiting sector ring 311c on the first extension arm 321 can be efficiently transmitted, and the force exerted by the first extension arm 321 on the limiting sector ring 311c can also be efficiently transmitted.

[0102] Furthermore, the convex ring 311b and the limiting sector ring 311c are arranged on the side of the locking member 31 facing the upper frame 111, that is, the elastic member 32 is located between the locking member 31 and the mounting plate 111d, so that the elastic member 32 is not easily detached from the cover body 11, ensuring the reliability of the locking assembly 3.

[0103] In a specific embodiment, as Figure 10 and Figure 11 shown, the locking member 31 has a hook portion 312, and the base 12 is provided with a limiting arm 121b protruding towards the locking groove 121a. When the locking member 31 is in the first position, the hook portion 312 abuts against the limiting arm 121b. Among them, the hook portion 312 is connected to the body 311.

[0104] In this embodiment, as Figure 10 and Figure 11 shown, when the body 1 is in the closed state, the hook portion 312 extends into the locking groove 121a, and the limiting arm 121b restricts the hook portion 312 from detaching from the locking groove 121a, so that the locking member 31 is kept in the first position, and further the body 1 is kept in the closed state, and the printer can print in a stable state.

[0105] Specifically, as Figure 11 shown, the side of the limiting arm 121b facing the cover body 11 has a first guiding surface, and the first guiding surface is inclined towards the direction where the locking groove 121a is located. The hook portion 312 is also correspondingly provided with an inclined second guiding surface. During the process of the hook portion 312 extending into the locking groove 121a, the second guiding surface abuts against the first guiding surface and moves along the first guiding surface. The first guiding surface exerts a force on the first guiding surface, causing the locking member 31 to rotate in the direction from the first position to the second position. At this time, the first extension arm 321 approaches the second extension arm 322, and the elastic member 32 is compressed; when the hook portion 312 passes over the limiting arm 121b, the second guiding surface is separated from the first guiding surface. At this time, the locking member 31 rotates in the direction from the second position to the first position under the elastic force of the elastic member 32, and the hook portion 312 is clamped with the locking groove 121a.

[0106] More specifically, as Figure 2As shown, the base 12 includes a lower frame 121, a bottom shell 122, and a baffle 123. The lower frame 121 is installed on the bottom shell 122, and the baffle 123 is detachably connected to the lower frame 121 and the bottom shell 122, facilitating the assembly and repair of the base 12. A locking groove 121a and a limiting arm 121b are provided on the lower frame 121.

[0107] In the above embodiment, as Figure 10 shown, the cover 11 is provided with a boss 111c, and the boss 111c can abut against the ribbon cassette 13. When the machine body 1 is in the closed state, the boss 111c presses the ribbon cassette 13, making the structure of the printer more stable and ensuring the stability of the printer during the printing process.

[0108] Preferably, there are at least two bosses 111c, and the two bosses 111c are symmetrically arranged on the upper frame 111.

[0109] Furthermore, the material of the boss 111c can be relatively soft rubber, silica gel, etc., so that the ribbon cassette 13 is not easily damaged while being pressed.

[0110] Specifically, as Figure 2 shown, the ribbon cassette 13 has a frame body, a supply shaft, a recovery shaft, and a print head 4 provided on the frame body. A ribbon roll is installed on the supply shaft. The ribbon is supplied from the supply shaft to the print head 4 and then recovered from the print head 4 to the recovery shaft. A pressure roller 124 is provided on the base 12. When the machine body 1 is in the closed state, the pressure roller 124 contacts the print head 4. A media roll 2 is installed between the ribbon cassette 13 and the base 12. The media and the ribbon are supplied to the print head 4 together. The pressure roller 124 presses the media and the ribbon against the print head 4, and the ink on the ribbon is transferred to the media. Therefore, the contact position between the pressure roller 124 and the print head 4 is the printing position. There is also a media outlet 14 between the cover 11 and the base 12, and the printed media can be discharged from the media outlet 14 under the rotation of the pressure roller 124.

[0111] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A printer, characterized in that: The printer comprises a body (1), and the body (1) comprises: A cover body (11), wherein locking components (3) are arranged on both sides of the cover body (11) along the width direction of the body (1), and the locking components (3) include locking pieces (31); A base (12), the cover body (11) being rotatably connected to the base (12), the base (12) being provided with a locking groove (121a), the locking member (31) being capable of engaging with the locking groove (121a) to limit the rotation of the cover body (11) relative to the base (12); Wherein, the two locking components (3) are relatively independent.

2. The printer according to claim 1, characterized in that: The cover body (11) comprises an upper frame (111), the locking member (31) is rotatably connected to the upper frame (111), the locking member (31) can be rotated between a first position and a second position, when the locking member (31) is located at the first position, the locking member (31) can be engaged with the locking groove (121a), and when the locking member (31) is located at the second position, the locking member (31) is disengaged from the locking groove (121a).

3. The printer according to claim 2, characterized in that: The locking member (31) comprises a body (311), one of the upper frame (111) and the body (311) is provided with a rotating shaft (111a), and the other is provided with a rotating hole (311a), and the rotating hole (311a) is rotatably connected to the rotating shaft (111a).

4. The printer according to claim 3, characterized in that: The locking assembly (3) comprises an elastic member (32), wherein the elastic member (32) is connected to the locking member (31), and the elastic member (32) is capable of applying a force to the locking member (31) to move the locking member (31) from the second position to the first position.

5. The printer according to claim 4, characterized in that: The elastic member (32) comprises a first extension arm (321) and a second extension arm (322); a convex ring (311b) and a limit ring (311c) are provided on the main body (311); the convex ring (311b) is located on the outer periphery of the rotating hole (311a); the elastic member (32) is sleeved on the convex ring (311b); the first extension arm (321) is in contact with the limit ring (311c); and the second extension arm (322) is in contact with the cover body (11).

6. The printer according to claim 3, characterized in that: The upper frame (111) is provided with a guide groove (111b), and the body (311) is provided with a guide protrusion (311d). When the locking member (31) is located at the first position, the guide protrusion (311d) cooperates with the guide groove (111b).

7. The printer according to claim 2, characterized in that: The cover body (11) comprises an upper shell (112) and a limiting plate (113) connected to the upper shell (112); the locking member (31) has a limiting protrusion (313); the limiting protrusion (313) extends between the limiting plate (113) and the upper shell (112) to limit the movement of the locking member (31).

8. The printer according to claim 2, characterized in that: The cover body (11) is provided with a mounting through hole (112a); the locking assembly (3) comprises a driving member (33); the driving member (33) has a pressing portion (331) and a connecting shaft (332); the locking member (31) has a connecting protrusion (314); the connecting protrusion (314) is provided with a connecting hole (314a); the connecting shaft (332) passes through the mounting through hole (112a) and is connected to the connecting hole (314a); When the locking member (31) is located at the first position, pressing the pressing portion (331) can apply a force to the locking member (31) to move from the first position to the second position.

9. The printer according to claim 2, characterized in that: The locking member (31) has a hook portion (312), and the base (12) is provided with a limiting wall (121b) protruding toward the locking groove (121a); ​​when the locking member (31) is located at the first position, the hook portion (312) abuts against the limiting wall (121b).

10. The printer according to any one of claims 1 to 9, characterized in that: The machine body (1) also includes a ribbon frame (13); the cover body (11) is provided with a boss (111c); and the boss (111c) can abut against the ribbon frame (13).

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