Thermal printer

Abstract

The utility model relates to the technical field of printing, and discloses a thermal printer, which comprises a shell assembly, a ticket supply assembly, a printing assembly, a fixed cutter assembly, a movable cutter assembly, a driving assembly and a first elastic reset piece, and is characterized in that the shell assembly is provided with a ticket passing channel; the ticket supply assembly is installed on the shell assembly. The printing assembly is installed on the shell assembly. The fixed cutter assembly comprises a first cutting edge, a first limited part and two second limited parts, the first limited part and the first cutting edge are located on the two opposite sides of the fixed cutter assembly respectively, and the two second limited parts are located on the other two opposite sides of the fixed cutter assembly respectively; the movable cutter assembly is movably installed on the shell assembly and comprises a second cutting edge, and the first cutting edge and the second cutting edge are used for cutting the thermosensitive printing paper; the driving assembly is installed on the shell assembly and can drive the movable cutter assembly. The first elastic reset piece is installed between the fixed cutter assembly and the shell assembly. Through the arrangement, the cutting reliability and stability of the thicker thermosensitive printing paper are improved, and the service life of the thicker thermosensitive printing paper is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of printing, in particular to a thermal printer. Background Art

[0002] Currently, thermal printers generally use a thermal method to form images or text on thermal printing paper, and then the imaged paper is taken out, and the thermal printer can then issue tickets quickly.

[0003] In the related art, a thermal printer generally includes a housing, a movable knife assembly and a fixed knife assembly. The movable knife assembly can move relative to the fixed knife assembly, and the fixed knife assembly is fixedly connected to the housing. During the operation of the thermal printer, a strip of thermal printing paper continuously passes through the thermal printer, and the movable knife assembly performs reciprocating motion, so that the cutting assembly cuts the thermal printing paper, so that the long strip of thermal printing paper is cut into multiple receipts.

[0004] However, during the process of cutting the bill, both ends of the cutting edge of the fixed knife assembly will be subjected to pressure from the moving knife assembly. If there are processing and assembly errors in the fixed knife assembly or the moving knife assembly, for example, the heights of the two sides of the fixed knife assembly are different, or the fixed knife assembly and the moving knife assembly are not in a standard cutting plane, when the thermal printing paper is cut, the forces at different contact points are uneven. When the thickness of the thermal printing paper is thick, the cutting reliability and stability are poor, and it is easy to cause the fixed knife assembly and the moving knife assembly to have a short service life. Utility Model Content

[0005] The embodiment of the utility model aims to provide a thermal printer to solve the technical problem that in the prior art, there are processing and assembly errors in the fixed knife assembly or the movable knife assembly, so that when the thermal printing paper is cut, the thermal printing paper is subjected to different pressures at different contact points of the fixed knife assembly and the movable knife assembly, resulting in poor cutting reliability and poor stability when the thermal printer cuts thicker thermal printing paper.

[0006] The utility model embodiment solves its technical problems by adopting the following technical solutions:

[0007] A thermal printer is provided, comprising:

[0008] A housing component, wherein the housing component is provided with a ticket passage;

[0009] A ticket supply assembly, the ticket supply assembly is installed on the housing assembly, and the ticket supply assembly is used to place thermal printing paper;

[0010] A printing assembly, the printing assembly being mounted on the housing assembly;

[0011] A fixed knife assembly, the fixed knife assembly comprising a first cutting edge, a first limited component and two second limited components, the first limited component and the first cutting edge are respectively located on two opposite sides of the fixed knife assembly, the two second limited components are respectively located on the other opposite sides of the fixed knife assembly, and the first limited component and the second limited component are both movably mounted on the housing assembly;

[0012] A movable knife assembly, the movable knife assembly is movably mounted on the housing assembly, the movable knife assembly comprises a second cutting edge, the second cutting edge is in a "V" shape, the first cutting edge and the second cutting edge are used to cut the thermal printing paper in the ticket passage;

[0013] A driving assembly, the driving assembly being mounted on the housing assembly, and the driving assembly being used to drive the movable knife assembly so that the second cutting edge moves toward or away from the first cutting edge;

[0014] A first elastic reset member is installed between the fixed knife assembly and the housing assembly.

[0015] In some embodiments, the fixed knife assembly includes a first mounting frame and a fixed knife blade, the first elastic reset member is installed between the first mounting frame and the housing assembly; the fixed knife blade is installed on the first mounting frame, the fixed knife blade includes the first cutting edge, and the first limited component is located on the central axis of the fixed knife assembly;

[0016] The housing assembly is provided with a first limiting groove and a second limiting groove, the first limited component is placed in the first limiting groove, and each of the second limited components is placed in a corresponding second limiting groove; the first elastic return member is compressed, and the first mounting frame, the groove wall of the first limiting groove and the groove wall of the second limiting groove jointly clamp the fixed knife blade.

[0017] In some embodiments, the shell assembly includes a first mounting wall and two second mounting walls, the two second mounting walls are respectively connected to opposite sides of the first mounting wall, and the two second mounting walls are perpendicular to the first mounting wall; the first limiting groove is opened on the first mounting wall, and each second limiting groove is opened on a corresponding second mounting wall, the fixed knife blade includes an abutting side edge, the first limited component is connected to the abutting side edge, the first limited component includes two protrusions, the two protrusions are respectively located on opposite sides of the first limited component, the first limited component is penetrated through the first limiting groove, and the first mounting wall can abut against the abutting side edge or the protrusion.

[0018] In some embodiments, the second limiting groove is provided on a side of the second mounting wall away from the first mounting wall, and an opening of the second limiting groove faces away from the first mounting wall;

[0019] The groove wall of the first limiting groove comprises an arc-shaped abutting wall, and the first mounting frame, the arc-shaped abutting wall and the groove wall of the second limiting groove jointly clamp the fixed knife blade;

[0020] The first limiting groove is T-shaped, comprising an inserting portion and a sliding portion that are interconnected, the inserting portion and the sliding portion are both strip-shaped and perpendicular to each other, the sliding portion is arranged along the paper output direction of the thermal printing paper, the inserting portion and the sliding portion are arranged in sequence along the paper output direction of the thermal printing paper, and the arc-shaped abutting wall is located at an end of the sliding portion away from the inserting portion and arches toward the inserting portion;

[0021] When the fixed knife assembly is installed into the housing assembly, the first limited component is inserted into the insertion portion, and the second limited component is inserted into the corresponding second limiting groove; the first elastic return member presses the fixed knife assembly to move the first limited component until the first limited component abuts against the arc-shaped abutting wall.

[0022] In some embodiments, the fixed blade includes an abutting side edge, the first limited component is connected to the abutting side edge, and the direction from the first cutting edge to the first limited component is perpendicular to the direction from one of the second limited components to another of the second limited components;

[0023] There is a preset distance between the second limited component and the first cutting edge, the intersection of the first elastic return member and the fixed knife assembly is located within a triangle, and the three vertices of the triangle are respectively located at one first limited component and two second limited components.

[0024] In some embodiments, the movable knife assembly includes a movable knife blade and a second mounting frame, the movable knife blade includes the second cutting edge, the movable knife blade is mounted on the second mounting frame, and the second mounting frame is movably mounted on the housing assembly; the driving assembly includes a transmission gear, the second mounting frame includes a rack, and the rack is meshed with the transmission gear; the transmission gear is capable of rotating to drive the movable knife assembly so that the second cutting edge moves in a direction toward or away from the first cutting edge.

[0025] In some embodiments, the second mounting frame is provided with a mounting cavity and two positioning cavities, the two positioning cavities are both communicated with the mounting cavity, the movable blade comprises two positioning members, the positioning members and the second cutting edge are respectively located at opposite ends of the movable blade, the two positioning members are symmetrically distributed with respect to the central axis of the movable blade, the movable blade is partially placed in the mounting cavity, and each positioning member is placed in a corresponding one of the positioning cavities;

[0026] The second mounting frame includes two elastic arms and two positioning protrusions, each of the positioning protrusions is connected to one end of a corresponding elastic arm, and each of the positioning protrusions is located in a corresponding positioning cavity; each of the positioning members is provided with a positioning groove, each of the positioning protrusions is installed in a corresponding positioning groove, and the positioning protrusions are in contact with the groove wall of the corresponding positioning groove.

[0027] In some embodiments, the housing assembly includes a main body and an upper cover component, the ticket passage is opened in the main body, and the upper cover component includes a rolling shaft, a third mounting frame, a second elastic reset member and a fourth mounting frame;

[0028] The fixed knife assembly is located at the ticket output end of the ticket passage, the printing assembly is located in the middle of the ticket passage, the rolling shaft is rotatably connected to the third mounting bracket, the rolling shaft is located at the ticket input end of the ticket passage, the third mounting bracket is rotatably connected to the fourth mounting bracket, the fourth mounting bracket is installed on the main body, the second elastic return member is arranged between the third mounting bracket and the fourth mounting bracket; the second elastic return member is used to provide elastic force so that the third mounting bracket abuts against the fourth mounting bracket; when the rolling shaft moves in a direction away from the main body, the second elastic return member is deformed and provides elastic force to the third mounting bracket.

[0029] In some embodiments, the upper cover component also includes a third elastic return member and a connecting rod. The fourth mounting frame is rotatably connected to the main body. The fourth mounting frame is provided with two guide grooves, and the two guide grooves are respectively located on opposite sides of the ticket passing channel. One end of the connecting rod is placed in one guide groove, and the other end of the connecting rod is placed in another guide groove. The third elastic return member is connected between the connecting rod and the fourth mounting frame, and the third elastic return member is used to provide elastic force.

[0030] In some embodiments, the main body is provided with a rotation limiting groove, and the guide groove includes a first end and a second end; in the direction from the third mounting bracket to the fourth mounting bracket, the first end and the second end are arranged in sequence, and the rotation limiting groove is located at the second end;

[0031] The connecting rod is located at the second end and placed in the rotation limiting groove. The connecting rod is in contact with the groove wall of the guide groove and the groove wall of the rotation limiting groove at the same time. The fourth mounting frame, the connecting rod and the main body are relatively fixed.

[0032] Compared with the prior art, in the embodiment of the utility model, the printing component prints on the thermal printing paper in the ticket passing channel to form multiple tickets connected in sequence; when the ticket moves to the fixed knife component, the driving component drives the movable knife component to move toward the fixed knife component, so that the first cutting edge and the second cutting edge cooperate to cut the thermal printing paper to separate the multiple connected tickets.

[0033] When the movable knife assembly and the fixed knife assembly are separated from each other, the housing assembly limits the fixed knife assembly through a first limited component and two second limited components, and the first limited component and the two second limited components correspond to the three vertices of the triangle, so that the housing assembly forms a stable supporting plane for the fixed knife assembly. At the same time, under the pressing action of the first elastic reset member, the fixed knife assembly can be stably installed on the housing assembly, and the movable knife assembly and the fixed knife assembly are easier to cut thermal printing paper, so that the thermal printer can cut thicker thermal printing paper.

[0034] In addition, in the process of the first cutting edge and the second cutting edge jointly cutting the thermal printing paper, the movable knife assembly squeezes the fixed knife assembly, so that the two second limited parts are separated from the shell assembly; at the same time, the second cutting edge abuts against the first cutting edge, and then the second cutting edge can support the fixed knife assembly through the first cutting edge; the second cutting edge is in a "V" shape, one side of the first cutting edge abuts against one side of the second cutting edge, and the other opposite side of the first cutting edge abuts against the other opposite side of the second cutting edge, so that there are always two contacts between the first cutting edge and the second cutting edge, and as the movable knife assembly cuts the thermal printing paper, the two contacts are close to each other At the same time, the shell assembly limits the first limited component, so that the fixed knife assembly can be continuously limited by three points. Even if there are processing and assembly errors in the fixed knife assembly and the movable knife assembly, during the cutting process of the thermal printing paper, the fixed knife assembly is under the action of the first elastic reset member, and the fixed knife assembly is continuously limited by three points. The three points will continue to be located in a plane, so that the fixed knife assembly and the movable knife assembly are always in a standard cutting plane, thereby ensuring the reliability and stability of the cutting when the thermal printer cuts thicker thermal printing paper, so as to increase the service life of the fixed knife assembly and the movable knife assembly.

[0035] In addition, after the first cutting edge and the second cutting edge complete cutting the thermal printing paper, the first elastic reset member can provide elastic force for the fixed knife assembly to reset the fixed knife assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] One or several embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0037] Figure 1 is a three-dimensional diagram of a thermal printer in one embodiment of the present utility model;

[0038] Figure 2 yes Figure 1 A cross-sectional view of a thermal printer in FIG.

[0039] Figure 3 yes Figure 1 A three-dimensional diagram of a thermal printer without some housing components;

[0040] Figure 4 yes Figure 1 A three-dimensional diagram of a fixed knife assembly and a movable knife assembly of a thermal printer;

[0041] Figure 5 yes Figure 1 A three-dimensional diagram of a fixed knife assembly of a thermal printer;

[0042] Figure 6 yes Figure 1 A perspective view of a main body of a thermal printer;

[0043] Figure 7 yes Figure 1 A three-dimensional diagram of a main body, a fixed knife blade and a movable knife assembly of a thermal printer;

[0044] Figure 8 yes Figure 1 A three-dimensional diagram of the transmission gear and the moving knife assembly of the thermal printer in the figure;

[0045] Fig. 9 yes Figure 1 A three-dimensional diagram of a moving knife assembly of a thermal printer;

[0046] Fig.10 yes Figure 1 A perspective view of a second mounting bracket of a thermal printer;

[0047] Fig.11 yes Figure 1 A three-dimensional diagram of a movable blade of a thermal printer;

[0048] Fig.12 yes Figure 1 The thermal printer in the omission of the stereogram after printing the components;

[0049] Fig.13 yes Figure 1A partial cross-sectional view of a thermal printer in FIG.

[0050] Fig.14 yes Figure 1 A three-dimensional diagram of a rolling shaft and a third mounting bracket of a thermal printer;

[0051] Fig.15 yes Figure 1 A perspective view of a fourth mounting bracket of a thermal printer;

[0052] Fig.16 Figure 1 A cross-sectional view of another cross section of the thermal printer;

[0053] Fig.17 yes Figure 1 A partial view of the connecting rod of a thermal printer in FIG.

[0054] Reference numerals:

[0055] 100, thermal printer; 10, housing assembly; 12, main body; 122, first mounting wall; 1222, first limiting groove; 1223, inserting portion; 1224, second limiting groove; 1225, sliding portion; 1226, arc-shaped abutting wall; 1202, rotation limiting groove; 124, second mounting wall; 14, upper cover component; 141, rolling shaft; 142, third mounting frame; 1422, sleeve member; 143, second elastic reset member; 1432, annular hook; 144, fourth mounting frame; 1442, guide groove; 1443, first end; 1444, second end; 1445, abutting inclined surface; 1446, hook; 145, third elastic reset member; 146, Connecting rod; 102, ticket passage; 20, ticket supply assembly; 30, printing assembly; 40, fixed knife assembly; 42, fixed knife blade; 422, first cutting edge; 424, second limited component; 4242, protrusion; 426, first limited component; 428, against side; 44, first mounting bracket; 50, moving knife assembly; 52, moving knife blade; 522, second cutting edge; 524, positioning member; 5242, positioning groove; 5202, arc cavity; 54, second mounting bracket; 542, rack; 544, positioning protrusion; 546, elastic arm; 5402, positioning cavity; 5404, mounting cavity; 60, driving assembly; 62, transmission gear; 70, first elastic reset member. DETAILED DESCRIPTION

[0056] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on another element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0058] A thermal printer 100 provided in an embodiment of the present application is described in detail below through a specific embodiment in conjunction with all the drawings in the specification.

[0059] Please refer to Figure 1 , Figure 2 and Figure 3 In one embodiment of the utility model, a thermal printer 100 is disclosed, including a housing assembly 10, a ticket supply assembly 20, a printing assembly 30, a fixed knife assembly 40, a movable knife assembly 50, a driving assembly 60 and a first elastic reset member 70. The housing assembly 10 is provided with a ticket passage 102; the ticket supply assembly 20 is installed on the housing assembly 10; the printing assembly 30 is installed on the housing assembly 10; the fixed knife assembly 40 includes a first cutting edge 422, a first limited component 424 and two second limited components 426, the first limited component 424 and the first cutting edge 422 are respectively located on opposite sides of the fixed knife assembly 40, and the two second limited components 426 are respectively located on opposite sides of the fixed knife assembly 40. The first limited component 424 and the second limited component 426 are respectively located on the other opposite sides of the fixed knife assembly 40, and are movably mounted on the shell assembly 10; the movable knife assembly 50 is movably mounted on the shell assembly 10, and the movable knife assembly 50 includes a second cutting edge 522, and the second cutting edge 522 is in a "V" shape. The first cutting edge 422 and the second cutting edge 522 are used to cut the thermal printing paper in the ticket passing channel 102; the driving assembly 60 is installed on the shell assembly 10, and the driving assembly 60 is used to drive the movable knife assembly 50 so that the second cutting edge 522 moves toward or away from the first cutting edge 422; the first elastic reset member 70 is installed between the fixed knife assembly 40 and the shell assembly 10.

[0060] The printing assembly 30 includes a rolling shaft 32 and a thermal print head 34. The rolling shaft 32 and the thermal print head 34 clamp the thermal printing paper in the ticket passage 102. The rolling shaft 32 can draw the thermal printing paper into the ticket passage 102 during the rolling process. Through the above structure, the printing assembly 30 prints the thermal printing paper in the ticket passage 102 to form a plurality of tickets connected in sequence; when the ticket moves to the fixed knife assembly 40, the driving assembly 60 drives the moving knife assembly 50 to move toward the fixed knife assembly 40, so that the first cutting edge 422 and the second cutting edge 522 cooperate to cut the thermal printing paper and separate the plurality of connected tickets.

[0061] When the movable knife assembly 50 and the fixed knife assembly 40 are separated from each other, the housing assembly 10 limits the fixed knife assembly 40 through a first limited component 424 and two second limited components 426. The first limited component 424 and the two second limited components 426 correspond to the three vertices of the triangle, and the housing assembly 10 forms a stable support plane for the fixed knife assembly 40. At the same time, under the pressing action of the first elastic reset member 70, the fixed knife assembly 40 can be stably installed on the housing assembly 10, and the movable knife assembly 50 and the fixed knife assembly 40 are easier to cut the thermal printing paper, and the thermal printer 100 can cut thicker thermal printing paper.

[0062] In addition, during the process of the first cutting edge 422 and the second cutting edge 522 jointly cutting the thermal printing paper, the movable knife assembly 50 squeezes the fixed knife assembly 40, so that the two second limited parts 426 are separated from the shell assembly 10; at the same time, the second cutting edge 522 abuts against the first cutting edge 422, and then the second cutting edge 522 can support the fixed knife assembly 40 through the first cutting edge 422; the second cutting edge 522 is in a "V" shape, one side of the first cutting edge 422 abuts against one side of the second cutting edge 522, and the other opposite side of the first cutting edge 422 abuts against the other opposite side of the second cutting edge 522, so that there are always two contacts between the first cutting edge 422 and the second cutting edge 522, and as the movable knife assembly 50 cuts the thermal printing paper During the cutting, the two contacts are close to each other, and at the same time, the housing assembly 10 limits the first limited component 424, so that the fixed knife assembly 40 can be continuously limited by three points. Even if there are processing and assembly errors in the fixed knife assembly 40 and the movable knife assembly 50, during the cutting of the thermal paper, the fixed knife assembly 40 is under the action of the first elastic reset member 70, and at the same time, the fixed knife assembly 40 is continuously limited by three points. The three points will continue to be located in a plane, so that the fixed knife assembly 40 and the movable knife assembly 50 are always in a standard cutting plane, so that when the thermal printer 100 cuts thicker thermal paper, the reliability and stability of the cutting are guaranteed, so as to improve the service life of the fixed knife assembly 40 and the movable knife assembly 50.

[0063] In addition, after the first cutting edge 422 and the second cutting edge 522 finish cutting the thermal printing paper, the movable knife assembly 50 moves away from the fixed knife assembly 40, and the first elastic reset member 70 can provide elastic force for the fixed knife assembly 40 to reset the fixed knife assembly 40.

[0064] Thermal printers in the prior art can generally only cut thermal printing paper with a thickness of at most 0.2 mm, while the thermal printer 100 in this embodiment can stably and reliably cut thermal printing paper with a thickness of 0.5 mm, and can cut plastic materials with a thickness of 0.5 mm. In addition, the fixed knife assembly 40 and the movable knife assembly 50 have a longer service life.

[0065] Specifically, in the present embodiment, the shell assembly 10 as a whole has a structure similar to a rectangular parallelepiped, and the two ends of the ticket passage 102 respectively pass through two opposite sides of the shell assembly 10; the ticket supply assembly 20 is located at one end of the ticket passage 102 (i.e., the ticket input end), and the ticket supply assembly 20 includes a support frame and a rotating shaft, which is rotatably connected to the support frame, and the rotating shaft is used to supply thermal printing paper rolls, and the support frame is installed on the shell assembly 10 by bolts. During the rotation of the rotating shaft, the thermal printing paper can extend into the ticket passage 102.

[0066] The fixed knife assembly 40 is installed in the shell assembly 10. The fixed knife assembly 40 is located at one end of the ticket passage 102 away from the ticket supply assembly 20 (i.e., the ticket discharging end). The fixed knife assembly 40 as a whole is a sheet-like structure similar to a rectangle, and the first cutting edge 422 is a straight line; the first limited component 424 and the second limited component 426 are both convex structures, and the shell assembly 10 is provided with a limiting groove. The first limited component 424 and the second limited component 426 are placed in the corresponding limiting groove. A first elastic return member 70 is provided between the fixed knife assembly 40 and the shell assembly 10. The first elastic return member 70 is a compression spring, and there are two of them. The two compression springs are respectively located on opposite sides of the fixed knife assembly 40. Under the pressure of the compression spring, the first limited component 424 and the second limited component 426 are abutted against the groove wall of the corresponding limiting groove.

[0067] The driving assembly 60 is a motor, and the driving assembly 60 includes a transmission gear 62. The moving knife assembly 50 includes a rack 542 (see Figure 8 ), the driving assembly 60 drives the movable knife assembly 50 to move relative to the housing assembly 10 through the engagement of the transmission gear 62 and the rack 542; the second cutting edge 522 is in a "V" shape.

[0068] In other embodiments, the shell assembly 10 may also be in other shapes, such as a cylinder; the ticket supply assembly 20 may also be installed in the shell assembly 10; the first limited component 424 and the second limited component 426 may also be other structures, such as a threaded connector; the drive assembly 60 may also drive the moving knife assembly 50 to move in other ways, for example, a screw is connected to the rotating shaft of the drive assembly 60, the moving knife assembly 50 includes a slider, a guide structure is provided between the moving knife assembly 50 and the shell assembly 10, and the slider is installed on the screw.

[0069] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the fixed knife assembly 40 includes a first mounting frame 44 and a fixed knife blade 42, and the first elastic reset member 70 is installed between the first mounting frame 44 and the shell assembly 10; the fixed knife blade 42 is installed on the first mounting frame 44, and the fixed knife blade 42 includes a first cutting edge 422, and the first limited component 424 is located on the central axis of the fixed knife assembly 40.

[0070] The shell assembly 10 is provided with a first limiting groove 1222 and a second limiting groove 1224, the first limited component 424 is placed in the first limiting groove 1222, and each second limited component 426 is placed in a corresponding second limiting groove 1224; the first elastic return member 70 is compressed, and the first mounting frame 44, the groove wall of the first limiting groove 1222 and the groove wall of the second limiting groove 1224 jointly clamp the fixed knife blade 42.

[0071] Through the above structure, the first limited component 424 is located on the central axis of the fixed knife assembly 40, and the two second limited components 426 are respectively located on both sides of the fixed knife blade 42, the first limited component 424 and the two second limited components 426 respectively correspond to the three vertices of the isosceles triangle, and each second limited component 426 is equidistant from the first limited component 424, so that the fixed knife assembly 40 can be more stably installed on the shell assembly 10.

[0072] Specifically, in this embodiment, the fixed knife blade 42 is a rectangular sheet structure as a whole, one end face of the first mounting frame 44 is in close contact with the fixed knife blade 42, and the other end face of the first mounting frame 44 is in contact with the first elastic reset member 70; the first mounting frame 44 and the fixed knife blade 42 are connected to each other by threaded connection.

[0073] The first limited component 424 is a T-shaped block structure, and the second limited component 426 is a rectangular parallelepiped; in the direction from the fixed knife blade 42 to the first mounting frame 44, the first limited component 424 can move along the first limiting groove 1222, and the second limited component 426 can move along the corresponding second limiting groove 1224.

[0074] The two second restricted parts 426 are symmetrically distributed with respect to the central axis of the fixed blade 42 , and the first restricted part 424 and the two second restricted parts 426 are respectively located at the three vertices of an isosceles triangle.

[0075] In other embodiments, the fixed knife blade 42 can also be other structures, such as a triangular or semicircular sheet structure; the first mounting frame 44 and the fixed knife blade 42 can also be connected in other ways, such as welding; the first limited component 424 and the second limited component 426 can also be other structures, such as a cylinder.

[0076] In this embodiment, the first position-limited component 424 and the second position-limited component 426 are both formed integrally with the fixed blade 42. In other embodiments, the first position-limited component 424 and the second position-limited component 426 may also be connected to the first mounting frame 44; or one of the first position-limited component 424 and the second position-limited component 426 is connected to the first mounting frame 44, and the other is connected to the fixed blade 42.

[0077] In some embodiments, the fixed blade 42 includes abutting side edge 428, a first limited component 426 is connected to the abutting side edge 428, and a direction from the first cutting edge 422 to the first limited component 426 is perpendicular to a direction from one second limited component 424 to another second limited component 424. A preset distance D1 is provided between the second limited component 424 and the first cutting edge 422, and a junction of the first elastic reset member 70 and the fixed blade assembly 40 is located within a triangle, and three vertices of the triangle are located at one first limited component 426 and two second limited components 424, respectively.

[0078] Through the above structure, there is a preset distance D1 between the second limited part 424 and the first cutting edge 422, so that when the second cutting edge 522 abuts against the first cutting edge 422, the second cutting edge 522 will not directly abut against the second limited part 424, and thus the second cutting edge 522 will not rub against the second limited part 424 and wear.

[0079] In addition, the intersection of the first elastic return member 70 and the fixed knife assembly 40 is located within a triangle, and the three vertices of the triangle are respectively located at a first limited component 426 and two second limited components 424; so that when the fixed knife assembly 40 is subjected to the pressure of the first elastic return member 70, the first elastic return member 70 can be more stable relative to the shell assembly 10.

[0080] Specifically, the two second limited parts 424 are respectively located on both sides of the fixed blade 42, wherein the distance between one second limited part 424 and the first cutting edge 422 is the preset distance D1, and the distance between the other second limited part 424 and the first cutting edge 422 is also the preset distance D1.

[0081] In some embodiments, the shell assembly 10 includes a first mounting wall 122 and two second mounting walls 124, the two second mounting walls 124 are respectively connected to the opposite sides of the first mounting wall 122, and the two second mounting walls 124 are perpendicular to the first mounting wall 122; the first limiting groove 1222 is opened on the first mounting wall 122, and each second limiting groove 1224 is opened on a corresponding second mounting wall 124, the fixed knife blade 42 includes abutting side 428, the first limited component 424 is connected to the abutting side 428, the first limited component 424 includes two protrusions 4242, the two protrusions 4242 are located on opposite sides of the first limited component 424, the first limited component 424 is penetrated by the first limiting groove 1222, and the first mounting wall 122 can abut against the abutting side 428 or the protrusion 4242.

[0082] Through the above structure, the first mounting wall 122 is located between the side edge 428 and the protrusion 4242. When the fixed knife blade 42 is subjected to pressure and moves slightly relative to the shell assembly 10, the groove wall of the first limiting groove 1222 limits the first limited component 424, so that the fixed knife blade 42 will not move too much relative to the shell assembly 10. In addition, the first mounting wall 122 can abut against the two protrusions 4242 to prevent the first limited component 424 from detaching from the first limiting groove 1222.

[0083] Specifically, when the first cutting edge 422 is subjected to pressure, the fixed blade 42 moves upward, and the first mounting wall 122 abuts against the abutting side edge 428 .

[0084] In some embodiments, the second limiting groove 1224 is defined on a side of the second mounting wall 124 away from the first mounting wall 122 , and an opening of the second limiting groove 1224 faces away from the first mounting wall 122 .

[0085] The groove wall of the first limiting groove 1222 includes an arc-shaped abutting wall 1226 , and the first mounting frame 44 , the arc-shaped abutting wall 1226 and the groove wall of the second limiting groove 1224 clamp the fixed blade 42 together.

[0086] The first limiting groove 1222 is T-shaped, and includes an inserting portion 1223 and a sliding portion 1225 that are interconnected. The inserting portion 1223 and the sliding portion 1225 are both bar-shaped and perpendicular to each other. The sliding portion 1225 is arranged along the paper output direction of the thermal printing paper. The inserting portion 1223 and the sliding portion 1225 are arranged in sequence along the paper output direction of the thermal printing paper. The arc-shaped abutting wall 1226 is located at one end of the sliding portion 1225 away from the inserting portion 1223 and arched toward the inserting portion 1223.

[0087] When the fixed knife assembly 40 is installed into the shell assembly 10, the first limited component 424 is inserted into the insertion portion 1223, and the second limited component 424 is inserted into the corresponding second limiting groove 1224; the first elastic return member 70 presses the fixed knife assembly 40, so that the first limited component 424 moves until the first limited component 424 abuts against the arc-shaped abutting wall 1226.

[0088] Through the above structure, the second limiting groove 1224 is opened on the side of the second mounting wall 124 away from the first mounting wall 122, and the opening of the second limiting groove 1224 is facing away from the first mounting wall 122, so that the second limited component 426 is easier to be installed into the corresponding second limiting groove 1224, and when the second limited component 426 is installed into the second limiting groove 1224, the insertion portion 1223 can allow the protrusion 4242 to be inserted, so that the fixed knife assembly 40 is easier to be installed on the shell assembly 10.

[0089] In addition, when the first mounting frame 44, the arcuate abutment wall 1226 and the groove wall of the second limiting groove 1224 jointly clamp the fixed knife blade 42, the arcuate abutment wall 1226 supports the fixed knife blade 42 through a point, and the fixed knife assembly 40 can be swung left and right to better adapt to the extrusion of the movable knife assembly 50, so that the fixed knife blade 42 and the movable knife blade 52 are easier to keep in a standard cutting plane.

[0090] Specifically, the two protrusions 4242 are respectively located on both sides of the first limited component 424, so that the first limited component 424 is in a "T"-shaped structure as a whole; the first limiting groove 1222 is also in a "T"-shaped structure, so that the protrusion 4242 can be inserted into the insertion portion 1223. The first limited component 424 is inserted into the insertion portion 1223 and moves along the sliding portion 1225, so that the groove wall of the sliding portion 1225 is located between the abutting side edge 428 and the protrusion 4242, and the distance between the abutting side edge 428 and the protrusion 4242 is greater than the thickness of the groove wall of the sliding portion 1225.

[0091] Please refer to Figure 8 and Fig. 9In some embodiments, the movable knife assembly 50 includes a movable knife blade 52 and a second mounting frame 54, the movable knife blade 52 includes a second cutting edge 522, the movable knife blade 52 is mounted on the second mounting frame 54, and the second mounting frame 54 is movably mounted on the shell assembly 10; the driving assembly 60 includes a transmission gear 62, and the second mounting frame 54 includes a rack 542, and the rack 542 is meshed with the transmission gear 62; the transmission gear 62 can rotate to drive the movable knife assembly 50 so that the second cutting edge 522 moves toward or away from the first cutting edge 422.

[0092] Through the above structure, under the meshing action of the transmission gear 62 and the rack 542, the driving assembly 60 can more stably drive the second mounting bracket 54 to move, so that the second cutting edge 522 and the first cutting edge 422 can cut the thermal printing paper more smoothly.

[0093] Specifically, in the present embodiment, the second mounting frame 54 is in a structure similar to a rectangular parallelepiped, the second mounting frame 54 is hollow, the movable blade 52 is embedded in the second mounting frame 54, and the number of the transmission gear 62 and the number of the rack 542 are both two.

[0094] In other embodiments, the second mounting frame 54 can also be other structures, such as a cylinder; the movable blade 52 can also be installed on the end face of the second mounting frame 54; the number of racks 542 can also be other, such as one, and the number of transmission gears 62 is consistent with the number of racks 542.

[0095] In some embodiments, there are two racks 542 , which are respectively located on both sides of the second mounting frame 54 , and are symmetrically distributed relative to the central axis of the second mounting frame 54 . Each rack 542 is meshed with a corresponding transmission gear 62 .

[0096] Through the above structure, the two racks 542 cooperate with the corresponding transmission gears 62, so that the second mounting frame 54 is more stable when moving relative to the shell assembly 10, and then when the second cutting edge 522 and the first cutting edge 422 cut the thermal printing paper, the flatness of the cut of the thermal printing paper is improved.

[0097] Specifically, the two racks 542 are respectively located on opposite sides of the second mounting frame 54 , the driving assembly 60 includes a motor, and the two transmission gears 62 are both connected to the rotating shaft of the motor.

[0098] Please refer to Fig.10 and Fig.11In some embodiments, the second mounting frame 54 is provided with an installation cavity 5404 and two positioning cavities 5402. The two positioning cavities 5402 are both connected to the installation cavity 5404. The movable blade 52 includes two positioning members 524. The positioning members 524 and the second cutting edge 522 are respectively located at opposite ends of the movable blade 52. The two positioning members 524 are symmetrically distributed relative to the central axis of the movable blade 52. The movable blade 52 is partially placed in the installation cavity 5404, and each positioning member 524 is placed in a positioning cavity 5402.

[0099] The second mounting frame 54 includes two elastic arms 546 and two positioning protrusions 544, each positioning protrusion 544 is connected to one end of a corresponding elastic arm 546, and each positioning protrusion 544 is located in a corresponding positioning cavity 5402; each positioning member 524 is provided with a positioning groove 5242, and each positioning protrusion 544 is installed in a corresponding positioning groove 5242, and the positioning protrusion 544 abuts against the groove wall of a corresponding positioning groove 5242.

[0100] Through the above structure, when the positioning protrusion 544 abuts against the groove wall of the corresponding positioning groove 5242, the second mounting frame 54 and the movable blade 52 are clamped with each other, and the number of the positioning protrusion 544 and the positioning groove 5242 are both two, so that the connection relationship between the second mounting frame 54 and the movable blade 52 is more stable; in addition, the two positioning protrusions 544 are symmetrically distributed relative to the central axis of the movable blade 52. When the movable blade 52 is subjected to pressure, the positioning protrusions 544 can support the movable blade 52 more evenly.

[0101] Specifically, the movable blade 52 is a sheet-like structure similar to a rectangle; the thickness of the mounting cavity 5404 is adapted to the thickness of the movable blade 52, and the cavity wall of the mounting cavity 5404 clamps the movable blade 52; the positioning member 524 is a sheet-like structure similar to a rectangle, and the formation of the positioning cavity 5402 is adapted to the shape of the positioning member 524; the positioning protrusion 544 is a semicircular columnar structure.

[0102] During the installation of the movable blade 52 relative to the second mounting frame 54, the positioning member 524 is inserted into the corresponding positioning cavity 5402, and the positioning member 524 presses against the positioning protrusion 544, causing the elastic arm 546 to undergo elastic deformation. When the positioning protrusion 544 is aligned with the corresponding positioning groove 5242, the elastic arm 546 is reset, driving the positioning protrusion 544 to embed into the corresponding positioning groove 5242, and the movable blade 52 is installed on the second mounting frame 54.

[0103] During the process of disassembling the movable blade 52 relative to the second mounting frame 54 , applying pressure to the positioning protrusion 544 can cause the positioning protrusion 544 to extend out of the corresponding positioning groove 5242 , thereby enabling the movable blade 52 to be disassembled relative to the second mounting frame 54 .

[0104] In some embodiments, in the direction from the second cutting edge 522 to the first cutting edge 422 , both ends of the second cutting edge 522 protrude relative to the middle of the second cutting edge 522 , and the movable blade 52 is provided with an arc-shaped cavity 5202 , which runs through the middle of the second cutting edge 522 .

[0105] Through the above structure, the second cutting edge 522 is inclined relative to the first cutting edge 422 in the direction from the two ends of the second cutting edge 522 to the middle of the second cutting edge 522. Therefore, in the process of the second cutting edge 522 and the first cutting edge 422 cutting the thermal printing paper, the thermal printing paper is cut from its two ends to the middle, and the contact area between the second cutting edge 522 and the thermal printing paper is reduced, thereby improving the reliability of cutting the thermal printing paper.

[0106] In addition, when the bill reaches the opening of the arc-shaped cavity 5202, the second cutting edge 522 stops moving. At this time, the portion of the bill corresponding to the position of the arc-shaped cavity 5202 is not cut off, and half-cutting of the bill can be achieved.

[0107] Specifically, the second cutting edge 522 is in a V-shape as a whole, the arc cavity 5202 is in a semicircular arc shape, and the arc cavity 5202 is concave relative to the middle of the second cutting edge 522. When the two sides of the second cutting edge 522 contact the first cutting edge 422, the two sides of the second cutting edge 522 contact and press the first cutting edge 422, so that the fixed blade assembly 40 presses the first elastic reset member 70, and then the first elastic reset member 70 and the movable blade 52 can clamp the fixed blade assembly 40, and finally improve the stability of the fixed blade 42 and the movable blade 52 when cutting thermal printing paper.

[0108] Please refer to Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the shell assembly 10 includes a main body 12 and an upper cover component 14 , the ticket passage 102 is opened in the main body 12 , and the upper cover component 14 includes a rolling shaft 141 , a third mounting frame 142 , a second elastic reset member 143 and a fourth mounting frame 144 .

[0109] The fixed knife assembly 40 is located at the ticket output end of the ticket passage 102, the printing assembly 30 is located in the middle of the ticket passage 102, the rolling shaft 141 is rotatably connected to the third mounting frame 142, the rolling shaft 141 is located at the ticket input end of the ticket passage 102, the third mounting frame 142 is rotatably connected to the fourth mounting frame 144, the fourth mounting frame 144 is installed on the main body 12, and the second elastic reset member 143 is arranged between the third mounting frame 142 and the fourth mounting frame 144; the second elastic reset member 143 is used to provide elastic force so that the third mounting frame 142 and the fourth mounting frame 144 are abutted; when the rolling shaft 141 moves in a direction away from the main body 12, the second elastic reset member 143 is deformed and provides elastic force for the third mounting frame 142.

[0110] Through the above structure, when the thermal printer 100 is in operation, the thermal printing paper is continuously pulled into the ticket passage 102, and the thermal printing paper abuts against the rolling shaft 141. The thermal printing paper can drive the rolling shaft 141 to rotate during the movement, so that the surface of the thermal printing paper will not have dynamic friction with the rolling shaft 141, reducing the possibility of damage to the surface of the thermal printing paper.

[0111] In addition, the printing speed of the thermal printing paper by the printing assembly 30 is different, so that the speed at which the thermal printing paper enters the ticket passage 102 is different, and the pressure on the rolling shaft 141 is constantly changing. After receiving the pressure of the thermal printing paper, the rolling shaft 141 can drive the third mounting frame 142 to rotate relative to the fourth mounting frame 144, and the second elastic reset member 143 is deformed and provides elastic force for the third mounting frame 142, so that the second elastic reset member 143 can play a buffering role for the third mounting frame 142; and when the pressure on the rolling shaft 141 is greater, the rotation amplitude of the third mounting frame 142 relative to the fourth mounting frame 144 is greater, the gap between the rolling shaft 141 and the main body 12 is greater, the opening of the input end of the ticket passage 102 is larger, and the thermal printing paper is less likely to be stuck at the input end of the ticket passage 102.

[0112] Specifically, the third mounting frame 142 is located at the upper end of the shell assembly 10, and the third mounting frame 142 as a whole has a structure similar to a triangular prism. Both ends of the third mounting frame 142 are rotatably connected to the fourth mounting frame 144 through a rotating shaft; the second elastic reset member 143 is a tension spring, and the third mounting frame 142 includes a socket 1422, and the socket 1422 is located in the middle of the third mounting frame 142, and the fourth mounting frame 144 is provided with a hook 1446; the annular hook located at one end of the second elastic reset member 143 is sleeved on the socket 1422, and the annular hook located at the other end of the second elastic reset member 143 is sleeved on the hook 1446.

[0113] Please refer to Fig.15 , Fig.16 and Fig.17In some embodiments, the upper cover component 14 also includes a third elastic reset member 145 and a connecting rod 146. The fourth mounting frame 144 is rotatably connected to the main body 12. The fourth mounting frame 144 is provided with two guide grooves 1442. The two guide grooves 1442 are respectively located on opposite sides of the ticket passage 102. One end of the connecting rod 146 is placed in one guide groove 1442, and the other end of the connecting rod 146 is placed in the other guide groove 1442. The third elastic reset member 145 is connected between the connecting rod 146 and the fourth mounting frame 144. The third elastic reset member 145 is used to provide elastic force.

[0114] Through the above structure, when the thermal printer 100 works normally, the third elastic return member 145 provides elastic force to the connecting rod 146, so that the end of the connecting rod 146 abuts against the groove wall of the corresponding guide groove 1442; the connecting rod 146 can be more stably connected to the fourth mounting bracket 144.

[0115] Specifically, the fourth mounting frame 144 has a structure similar to a rectangular parallelepiped as a whole, and the fourth mounting frame 144 includes an abutment slope 1445. When the second elastic reset member 143 is reset, the third mounting frame 142 abuts against the abutment slope 1445, and the hook 1446 is arranged on the abutment slope 1445; the end of the fourth mounting frame 144 facing away from the third mounting frame 142 is rotatably connected to the main body 12 through a rotating shaft.

[0116] An annular hook is respectively provided at both ends of the third elastic reset member 145, the annular hook at one end of the third elastic reset member 145 is hung on the fourth mounting frame 144, and the annular hook at the other end of the third elastic reset member 145 is hung on the connecting rod 146; there are two third elastic reset members 145, and the two third elastic reset members 145 are respectively located on both sides of the fourth mounting frame 144. Two guide grooves 1442 are respectively located at both ends of the connecting rod 146, and the guide grooves 1442 are waist-shaped.

[0117] In some embodiments, the main body 12 is provided with a rotation limit groove 1202, and the guide groove 1442 includes a first end 1443 and a second end 1444; in the direction from the third mounting frame 142 to the fourth mounting frame 144, the first end 1443 and the second end 1444 are arranged in sequence, and the rotation limit groove 1202 is located at the second end 1444.

[0118] The connecting rod 146 is located at the second end 1444 and is placed in the rotation limiting groove 1202. The connecting rod 146 abuts against the groove wall of the guide groove 1442 and the groove wall of the rotation limiting groove 1202 at the same time. The fourth mounting frame 144, the connecting rod 146 and the main body 12 are relatively fixed.

[0119] Through the above structure, when the thermal printing paper is stuck in the ticket passage 102, the third mounting bracket 142 needs to be rotated more significantly relative to the main body 12; at this time, force is applied to the connecting rod 146 from the second end 1444 to the first end 1443, so that the connecting rod 146 moves along the guide groove 1442. When the connecting rod 146 moves to the outside of the rotation limit groove 1202, the fourth mounting bracket 144 rotates relative to the main body 12, driving the third mounting bracket 142 to move in a direction away from the main body 12, thereby increasing the local height of the ticket passage 102 to facilitate the user to remove the jammed thermal printing paper.

[0120] Specifically, the rotation limiting groove 1202 is semicircular, and the cross section of the connecting rod 146 is circular.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal printer, characterized in that: include: A housing component, wherein the housing component is provided with a ticket passage; A ticket supply assembly, the ticket supply assembly is installed on the housing assembly, and the ticket supply assembly is used to place thermal printing paper; A printing assembly, the printing assembly being mounted on the housing assembly; A fixed knife assembly, the fixed knife assembly comprising a first cutting edge, a first limited component and two second limited components, the first limited component and the first cutting edge are respectively located on two opposite sides of the fixed knife assembly, the two second limited components are respectively located on the other opposite sides of the fixed knife assembly, and the first limited component and the second limited component are both movably mounted on the housing assembly; A movable knife assembly, the movable knife assembly is movably mounted on the housing assembly, the movable knife assembly comprises a second cutting edge, the second cutting edge is in a "V" shape, the first cutting edge and the second cutting edge are used to cut the thermal printing paper in the ticket passage; A driving assembly, the driving assembly being mounted on the housing assembly, and the driving assembly being used to drive the movable knife assembly so that the second cutting edge moves toward or away from the first cutting edge; A first elastic reset member is installed between the fixed knife assembly and the housing assembly.

2. The thermal printer according to claim 1, characterized in that: The fixed knife assembly includes a first mounting frame and a fixed knife blade, the first elastic reset member is installed between the first mounting frame and the housing assembly; the fixed knife blade is installed on the first mounting frame, the fixed knife blade includes the first cutting edge, and the first limited component is located on the central axis of the fixed knife assembly; The housing assembly is provided with a first limiting groove and a second limiting groove, the first limited component is placed in the first limiting groove, and each of the second limited components is placed in a corresponding second limiting groove; the first elastic return member is compressed, and the first mounting frame, the groove wall of the first limiting groove and the groove wall of the second limiting groove jointly clamp the fixed knife blade.

3. The thermal printer according to claim 2, characterized in that: The shell assembly includes a first mounting wall and two second mounting walls, the two second mounting walls are respectively connected to the opposite sides of the first mounting wall, and the two second mounting walls are perpendicular to the first mounting wall; the first limiting groove is opened in the first mounting wall, and each second limiting groove is opened in a corresponding second mounting wall, the fixed knife blade includes an abutting side edge, the first limited component is connected to the abutting side edge, the first limited component includes two protrusions, the two protrusions are respectively located on the opposite sides of the first limited component, the first limited component is penetrated by the first limiting groove, and the first mounting wall can abut against the abutting side edge or the protrusion.

4. The thermal printer according to claim 3, characterized in that: The second limiting groove is formed on a side of the second mounting wall away from the first mounting wall, and the opening of the second limiting groove faces away from the first mounting wall; The groove wall of the first limiting groove comprises an arc-shaped abutting wall, and the first mounting frame, the arc-shaped abutting wall and the groove wall of the second limiting groove jointly clamp the fixed knife blade; The first limiting groove is T-shaped, comprising an inserting portion and a sliding portion that are interconnected, the inserting portion and the sliding portion are both strip-shaped and perpendicular to each other, the sliding portion is arranged along the paper output direction of the thermal printing paper, the inserting portion and the sliding portion are arranged in sequence along the paper output direction of the thermal printing paper, and the arc-shaped abutting wall is located at an end of the sliding portion away from the inserting portion and arches toward the inserting portion; When the fixed knife assembly is installed into the housing assembly, the first limited component is inserted into the insertion portion, and the second limited component is inserted into the corresponding second limiting groove; the first elastic return member presses the fixed knife assembly to move the first limited component until the first limited component abuts against the arc-shaped abutting wall.

5. The thermal printer according to claim 2, characterized in that: The fixed blade comprises an abutting side edge, the first limited component is connected to the abutting side edge, and the direction from the first cutting edge to the first limited component is perpendicular to the direction from one of the second limited components to another of the second limited components; There is a preset distance between the second limited component and the first cutting edge, the intersection of the first elastic return member and the fixed knife assembly is located within a triangle, and the three vertices of the triangle are respectively located at one first limited component and two second limited components.

6. The thermal printer according to claim 1, characterized in that: The movable knife assembly comprises a movable knife blade and a second mounting frame, the movable knife blade comprises the second cutting edge, the movable knife blade is mounted on the second mounting frame, and the second mounting frame is movably mounted on the housing assembly; the driving assembly comprises a transmission gear, the second mounting frame comprises a rack, and the rack is meshed with the transmission gear; The transmission gear can rotate to drive the movable knife assembly so that the second cutting edge moves toward or away from the first cutting edge.

7. The thermal printer according to claim 6, characterized in that: The second mounting frame is provided with a mounting cavity and two positioning cavities, the two positioning cavities are both communicated with the mounting cavity, the movable blade comprises two positioning members, the positioning members and the second cutting edge are respectively located at opposite ends of the movable blade, the two positioning members are symmetrically distributed relative to the central axis of the movable blade, the movable blade is partially placed in the mounting cavity, and each positioning member is placed in a corresponding one of the positioning cavities; The second mounting frame includes two elastic arms and two positioning protrusions, each of the positioning protrusions is connected to one end of a corresponding elastic arm, and each of the positioning protrusions is located in a corresponding positioning cavity; each of the positioning members is provided with a positioning groove, each of the positioning protrusions is installed in a corresponding positioning groove, and the positioning protrusions are in contact with the groove wall of the corresponding positioning groove.

8. The thermal printer according to claim 1, characterized in that: The housing assembly comprises a main body and an upper cover component, the ticket passage is opened in the main body, and the upper cover component comprises a rolling shaft, a third mounting frame, a second elastic reset member and a fourth mounting frame; The fixed knife assembly is located at the ticket output end of the ticket passage, the printing assembly is located in the middle of the ticket passage, the rolling shaft is rotatably connected to the third mounting bracket, the rolling shaft is located at the ticket input end of the ticket passage, the third mounting bracket is rotatably connected to the fourth mounting bracket, the fourth mounting bracket is installed on the main body, the second elastic return member is arranged between the third mounting bracket and the fourth mounting bracket; the second elastic return member is used to provide elastic force so that the third mounting bracket abuts against the fourth mounting bracket; when the rolling shaft moves in a direction away from the main body, the second elastic return member is deformed and provides elastic force to the third mounting bracket.

9. The thermal printer according to claim 8, characterized in that: The upper cover component also includes a third elastic reset member and a connecting rod. The fourth mounting frame is rotatably connected to the main body. The fourth mounting frame is provided with two guide grooves, and the two guide grooves are respectively located on opposite sides of the ticket passing channel. One end of the connecting rod is placed in one guide groove, and the other end of the connecting rod is placed in the other guide groove. The third elastic reset member is connected between the connecting rod and the fourth mounting frame, and the third elastic reset member is used to provide elastic force.

10. The thermal printer according to claim 9, characterized in that: The main body is provided with a rotation limiting groove, and the guide groove includes a first end and a second end; in the direction from the third mounting bracket to the fourth mounting bracket, the first end and the second end are arranged in sequence, and the rotation limiting groove is located at the second end; The connecting rod is located at the second end and placed in the rotation limiting groove. The connecting rod is in contact with the groove wall of the guide groove and the groove wall of the rotation limiting groove at the same time. The fourth mounting frame, the connecting rod and the main body are relatively fixed.

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