Printer

Abstract

The printer comprises a printer shell, the printer shell comprises a fixed shell body and a rotary shell body, and the fixed shell body and the rotary shell body are rotatably connected through a rotating piece; the printer further comprises a swing rod, a first rotating shaft, a substrate, a printing head and a connecting rod. The base plate is rotationally connected with the oscillating rod through a first rotating shaft, and the printing head is arranged on the outer surface of the base plate; the position, close to the bottom end, of the swing rod is connected with the inner wall of the printer shell through a second rotating shaft. A first elastic piece is further arranged between the swing rod and the inner wall of the printer shell. The first elastic piece can drive the upper portion of the swing rod to incline towards the lower portion of the swing rod with the second rotating shaft as the fulcrum. The connecting rod is movably arranged in the printer shell, and the rotating piece is used for driving the connecting rod to move to abut against the swing rod; the scheme has the advantages that the opening of the paper filling position can be enlarged, and paper can be conveniently placed.

Description

Technical Field

[0001] This application relates to the technical field of printers, and specifically, to a printer. Background Art

[0002] A thermal printer is a small and portable printing device, which is internally provided with a roll of printing paper, a print head, a substrate, a swing rod, a rubber roller, and a driving mechanism, etc. Among them, the swing rod is rotationally connected to a vertical steel shaft provided on the substrate. The print head is connected to the substrate. The swing rod directly serves as an open cover trigger element, and it rotates along the steel shaft, so that the print head thereon approaches the rubber roller to print the paper between the two; however, for the swing rod with the above structure, since the axes of the print head and the rubber roller of the printer are parallel to each other, there is a gap with equal width up and down between the two. In order to ensure the printing effect and make it easier for the print head and the rubber roller of the printer to press the paper tightly, the gap is set relatively narrow, so it is very difficult to place the paper into this gap; for example, a portable thermal printer disclosed in the patent application No. CN99221315, the distance between the paper feed rubber roller and the thermal print head in this solution cannot be adjusted, and the gap between the two is very small, making it difficult to place the paper. Utility Model Content

[0003] In view of the above deficiencies of the prior art, this application provides a printer that can expand the opening of the paper loading position to facilitate paper feeding.

[0004] To solve the above technical problems, the technical solution adopted in this application is: a printer, the structure of which includes a printer housing, and the printer housing includes a fixed housing and a rotating housing, and the fixed housing and the rotating housing are rotatably connected through a rotating member; it also includes a swing rod, a first rotating shaft, a substrate, a print head, and a connecting rod; the substrate is rotationally connected to the swing rod through the first rotating shaft, and the print head is arranged on the outer surface of the substrate; the bottom end of the swing rod is connected to the inner wall of the printer housing through a second rotating shaft; a first elastic member is also arranged between the swing rod and the inner wall of the printer housing, and the first elastic member can drive the upper part of the swing rod to tilt downward with the second rotating shaft as a fulcrum; the connecting rod is movably arranged in the printer housing, and the rotating member is used to drive the connecting rod to move and press against the swing rod.

[0005] With the above structure, in this application, the bottom end of the swing rod is connected to the inner wall of the printer housing through a second rotating shaft, and then a first elastic member is arranged between the swing rod and the inner wall of the printer housing to pull the upper part of the swing rod to tilt downward with the second rotating shaft as a fulcrum, so that the substrate and the print head thereon also tilt. At this time, the print head and the rubber roller of the printer are in a V-shaped state with a wider upper part and a narrower lower part, so the opening between the two is enlarged, and thus it is easier to place the paper.

[0006] Further, when the rotating housing rotates to cover the fixed housing, the rotating member drives the connecting rod to move so as to push the swing rod to overcome the driving force of the first elastic member, causing the swing rod to rotate so that the print head approaches the rubber roller; when the fixed housing and the rotating housing are opened, the rotating member moves away from the connecting rod, and the connecting rod disengages from the swing rod, causing the upper part of the swing rod to incline downward relative to the second rotating shaft; that is, by the action of opening the cover, the inclination state of the swing rod can be adjusted, with strong relevance and simple operation.

[0007] Further, a torsion spring is sleeved on the first rotating shaft, and the torsion spring abuts between the substrate and the swing rod; with this structure, when the connecting rod drives the swing rod to reset and the print head approaches the rubber roller, due to the setting of the above torsion spring, the print head presses the rubber roller with a compensating elastic force, and the printing of the printing paper will be clearer.

[0008] Further, the length extension direction of the first elastic member is perpendicular to the axial direction of the second rotating shaft. With this structure, when the first elastic member pulls the upper part of the swing rod, the upper part of the swing rod can be inclined downward relative to the second rotating shaft, so that a V-shaped gap with a wider upper part and a narrower lower part is formed between the print head and the rubber roller, which is convenient for placing the paper.

[0009] Further, a first guiding surface is provided at one end of the connecting rod close to the swing rod, and the first guiding surface is gradually inclined from top to bottom; with this structure, when the connecting rod is driven to contact the swing rod, it smoothly enters below the swing rod through the action of the first guiding surface, and gradually resets the swing rod by overcoming the tensile force of the first elastic member as the connecting rod enters. During this process, the upper part of the print head gradually approaches the rubber roller, so as to effectively press and print the paper.

[0010] Furthermore, a second guiding surface is provided at one end of the connecting rod away from the swing rod, and the second guiding surface is gradually inclined from top to bottom; with this structure, during the process of closing the cover of the rotating member, it will gradually abut against the inclined second guiding surface of the connecting rod and gradually push the connecting rod towards the swing rod, causing the inclined swing rod to reset, and the print head connected thereto is pressed and matched with the rubber roller to achieve printing.

[0011] Further, the fixed housing includes a lower housing and a middle housing. The middle housing is covered on the lower housing. A through hole for the connecting rod to pass through is provided on the middle housing, and the connecting rod enters the groove where the rotating member is located through the through hole. A limiting block is also provided on the middle housing. The limiting block is inserted into the connecting rod, and a second elastic member is abutted between the limiting block and the connecting rod. With the above structure, the connecting rod can be abutted by the second elastic member. When the rotating member drives the connecting rod to move towards the swing rod, the second elastic member is compressed. When the rotating member disengages from driving the connecting rod, the second elastic member extends and resets to push the connecting rod away from the swing rod and enter the groove where the rotating member is located again.

[0012] Further, a rotating connection hole sleeved with the second rotating shaft is provided at a position near the bottom end of the swing rod, and a notch is provided on the rotating connection hole. With this structure, during the connection process between the rotating connection hole and the second rotating shaft, connection can be achieved through the deformation force of the notch. The setting of the notch can enable the notch to be enlarged by pressing the swing rod in a narrow space to achieve connection with the second rotating shaft, making the connection more convenient and saving assembly space.

[0013] Further, a PCB board is provided inside the fixed housing, and an open cover inductor is provided on the PCB board. The open cover inductor (open cover sensor) is located below the swing rod. When the swing rod is pulled and tilted by the first elastic member, the swing rod abuts against the open cover inductor. When the swing rod is pushed back to its original position by the connecting rod, the swing rod separates from the open cover inductor. With the above structure, when the printer is in the open cover state, at this time the swing rod is tilted and its lower end will abut against the open cover inductor to trigger the open cover inductor. It is continuously pressed and connected during opening, indicating that the printer is in the open cover state. When the printer is closed, under the pushing force of the connecting rod, the lower end of the swing rod moves away from the open cover inductor, indicating that the cover is closed. The above structure can protect the safe operation of the printer.

[0014] Further, there are two second rotating shafts, which are symmetrically arranged on the left and right sides in the width direction of the gear bracket respectively. Through this setting, the swing rod can be supported at two points, and it is more balanced and stable during the process of being pulled and tilted by the first elastic member, and the reset is also more accurate. Description of the Drawings

[0015] Figure 1 Structural schematic diagram of the first view of the components related to the swing rod in the printer of the present application.

[0016] Figure 2 Structural schematic diagram of the second view of the components related to the swing rod in the printer of the present application.

[0017] Figure 3Schematic diagram of the structure of the exploded view of the components related to the swing rod in the printer of the present application.

[0018] Figure 4 Schematic diagram of the structure of the first view after the components related to the swing rod in the printer of the present application are combined with the gear assembly.

[0019] Figure 5 Schematic diagram of the structure of the second view after the components related to the swing rod in the printer of the present application are combined with the gear assembly.

[0020] Figure 6 Schematic diagram of the structure of the third view after the components related to the swing rod in the printer of the present application are combined with the gear assembly.

[0021] Figure 7 Schematic diagram of the structure of the first view of the sectional view of the printer of the present application in the open state.

[0022] Figure 8 Schematic diagram of the structure of the second view of the sectional view of the printer of the present application in the open state.

[0023] Figure 9 Schematic diagram of the structure of the sectional view of the printer of the present application in the closed state.

[0024] Figure 10 Schematic diagram of the structure of the first view of the printer of the present application.

[0025] Figure 11 Schematic diagram of the structure of the second view of the printer of the present application.

[0026] Figure 12 Schematic diagram of the structure of the middle shell of the printer of the present application.

[0027] As shown in the attached drawings: 1. Swing rod, 101. Rotating connection hole, 102. Notch, 2. First rotating shaft, 3. Substrate, 301. Connecting plate, 302. Connection hole, 4. Print head, 5. Link rod, 501. First guiding surface, 502. Second guiding surface, 6. Printer housing, 601. Fixed housing, 6011. Lower shell, 6012. Middle shell, 6013. Through hole, 6014. Groove, 6015. Limiting block, 602. Rotating housing, 603. Rotating part, 7. Second rotating shaft, 8. First elastic part, 9. Rubber roller, 10. Motor, 11. Gear bracket, 12. Gear, 13. Torsion spring, 14. Snap ring, 15. Second elastic part, 16. PCB board, 17. Open cover inductor. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings. Obviously, the described embodiments are only preferred embodiments, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application;

[0029] In addition, it should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] As shown in the Figure 1-11 accompanying drawings, a printer according to the present application includes a printer housing 6, and the printer housing 6 includes a fixed housing 601 and a rotating housing 602, and the fixed housing 601 and the rotating housing 602 are rotatably connected through a rotating member 603; it further includes a swing rod 1, a first rotating shaft 2, a substrate 3, a print head 4 and a connecting rod 5; the substrate 3 is rotatably connected to the swing rod 1 through the first rotating shaft 2, and the print head 4 is disposed on the outer surface of the substrate 3; the swing rod 1 is connected to the inner wall of the printer housing 6 through a second rotating shaft 7 at a position near the bottom end, and can rotate relative to the second rotating shaft after connection; more specifically, the first rotating shaft 2 is axially parallel to the rubber roller 9 of the printer, and the second rotating shaft 7 is axially perpendicular to the rubber roller 9 of the printer;

[0031] A first elastic member 8 is further disposed between the swing rod 1 and the inner wall of the printer housing 6. Specifically, the first elastic member may be a tension spring structure, with one end hooked to the upper part of the swing rod and the other end hooked to a position on the inner bottom surface of the housing. Under the pulling force of the first elastic member, the swing rod tilts toward the pulled direction with the second rotating shaft as the fulcrum. At this time, the substrate and the print head connected to the swing rod also tilt together, so that a V-shaped gap that is wider at the top and narrower at the bottom is formed between the print head and the rubber roller 9 of the printer. The first elastic member 8 can drive the upper part of the swing rod 1 to tilt toward its lower part with the second rotating shaft 7 as the fulcrum; the connecting rod 5 is movably disposed in the printer housing 6, and the rotating member 603 is used to drive the connecting rod 5 to move and press against the swing rod 1; specifically, when the rotating housing rotates to be closed with the fixed housing, the rotating member drives the connecting rod to move to push the swing rod 1 to overcome the driving force of the first elastic member 8. The specific process is that after closing, the rotating member will approach and abut against the connecting rod, thereby driving the connecting rod to move toward the swing rod direction, so that the swing rod overcomes the pulling force of the first elastic member and resets, and no longer tilts; during this process, the substrate and the print head connected to the swing rod also reset, so as to approach the rubber roller and no longer form a V-shaped gap, causing the swing rod 1 to reset; when the fixed housing 601 and the rotating housing 602 are opened, the rotating member 603 moves away from the connecting rod 5, and the connecting rod 5 disengages from the swing rod 1, causing the upper part of the swing rod 1 to tilt toward the lower part relative to the second rotating shaft; it should be noted that the swing rod of the present application can be used in a thermal printer, in which the print head 4 and the rubber roller 9 of the printer are adjacent to or tightly press against the paper, and the gap formed between the two allows the paper to be printed to pass through; a gear assembly is further disposed in the printer housing of the present application, specifically including a motor 10 that drives the gear to rotate, a gear bracket 11, and a plurality of gears 12 that are meshed with each other below the gear rack 11; and one end of the first elastic member of the present application can be connected to the upper end of the swing rod, and the other end can be connected to the gear bracket. When there is no pushing by the connecting rod, the first elastic member pulls the swing rod to tilt toward the gear bracket at the bottom.

[0032] With the above structure, in the present application, the bottom end of the swing rod is connected to the inner wall of the printer housing through the second rotating shaft, and then a first elastic member is disposed between the swing rod and the inner wall of the printer housing to pull the upper part of the swing rod to tilt downward with the second rotating shaft as the fulcrum. In this way, the substrate and the print head thereon also tilt. At this time, the print head and the rubber roller of the printer are in a V-shaped state that is wider at the top and narrower at the bottom, so that the opening between the two is enlarged, and thus it is easier to feed paper. Figure 5 and 10 The cylindrical one in the figure is the roll paper, and the paper passes through between the print head and the rubber roller of the printer.

[0033] As shown in the appendix Figure 1 、 3As shown in Figure -4, a torsion spring 13 is sleeved on the first rotating shaft 2 of the present application. The torsion spring 13 abuts between the substrate 3 and the swing rod 1, and an elastic compensation force can be formed by the torsion spring abutting between the two. With this structure, when the connecting rod drives the swing rod to reset and the print head approaches the rubber roller, due to the setting of the above torsion spring, the print head presses the rubber roller with a compensating elastic force, and the printing of the printing paper will be clearer.

[0034] As shown in the attached Figure 1 , 3 -4, at the upper and lower ends of the substrate 3 of the present application in the vertical direction, connecting plates 301 covering the swing rod 1 extend. Connection holes 302 are provided on the connecting plates 301. Specifically, corresponding connection holes for the first rotating shaft to pass through are also provided on the swing rod 1. The first rotating shaft 2 passes through the connection holes 302 and protrudes from the connecting plates 301. A snap ring 14 is sleeved on the protruding first rotating shaft 2. The connection between the substrate and the swing rod is realized in the above manner, and the setting of the snap ring makes disassembly and assembly more convenient.

[0035] As shown in the attached Figure 2 , 4 -5, the length extension direction of the first elastic member 8 of the present application is perpendicular to the axial direction of the second rotating shaft 7, that is, their extension directions are not in the same plane but perpendicular to each other. With this structure, when the first elastic member pulls the upper part of the swing rod, the upper part of the swing rod can be tilted downward relative to the second rotating shaft, so that a V-shaped gap that is wider at the top and narrower at the bottom is formed between the print head and the rubber roller, which is convenient for placing the paper.

[0036] As shown in the attached Figure 3-4 , Figures 7-9, one end of the connecting rod 5 of the present application close to the swing rod 1 is provided with a first guiding surface 501. The first guiding surface 501 is gradually inclined from top to bottom, specifically, it is inclined downward towards the swing rod from top to bottom. With this structure, when the connecting rod is driven to contact the swing rod, it smoothly enters below the swing rod through the action of the first guiding surface. As the connecting rod enters, the swing rod is gradually reset against the tensile force of the first elastic member. During this process, the upper part of the print head of the printer gradually approaches the rubber roller, thereby realizing effective pressing and printing of the paper.

[0037] As shown in the attached Figure 3-4, as shown in FIGS. 7 - 9, at the end of the connecting rod 5 away from the swing rod 1, i.e., the end close to the rotating member 603, a second guiding surface 502 is provided. The second guiding surface 502 is gradually inclined from top to bottom, specifically, the inclination direction is from top to bottom towards the direction of the rotating member, and this second guiding surface 502 is used to abut against the rotating member 603, so that the rotating member 603 can gradually drive the connecting rod 5 to move during the closing process to push the inclined swing rod 1 to reset; with this structure, when the printer housing is being closed, the rotating member on it will abut against the second guiding surface, and as its inclination angle gradually pushes the connecting rod towards the swing rod direction, the swing rod is pushed.

[0038] As shown in the attached Figure 7-9 and FIGS. 11 - 12, the fixed housing 601 described in the present application includes a lower housing 6011 and a middle housing 6012. The middle housing 6012 is covered on the lower housing 6011. A through - hole 6013 for the connecting rod 5 to pass through is provided on the middle housing 6012. The connecting rod 5 enters the groove 6014 where the rotating member 603 is located through the through - hole 6013. Specifically, this groove 6014 can be provided on the middle housing for accommodating the rotating member 603. A limiting block 6015 is further provided on the middle housing 6012. This limiting block is located on the back of the hollow part, i.e., the side close to the inner wall of the lower housing. The limiting block 6015 is inserted into the connecting rod 5. Specifically, the connecting rod 5 is hollow - designed, with an opening at the upper part for the limiting block to be inserted, and a second elastic member 15 abuts between the limiting block 6015 and the connecting rod 5. Specifically, one end of the second elastic member close to the swing rod abuts against the limiting block, and the end close to the rotating member abuts against the inner side wall of the connecting rod; with the above - mentioned structure, the connecting rod can be abutted by the second elastic member. When the rotating member drives the connecting rod towards the swing rod direction, the second elastic member is compressed. When the rotating member disengages from driving the connecting rod, the second elastic member extends and resets to push the connecting rod away from the swing rod and enter the groove where the rotating member is located again.

[0039] More specifically, as shown in the attached Figure 7-9As shown in the figure, a driving assembly for driving the rotation of the driving rubber roller 9 is provided inside the printer housing 6 of the present application. The driving assembly includes a motor 10 for driving the rotation of a gear, a gear bracket 11 for connecting the motor and the gear, and multiple groups of meshing gears 12. Among them, the motor 10 drives the rotation of a main gear, and then the rotation is transmitted through meshing to another gear connected to the rubber roller 9, so that the rubber roller rotates; the gear bracket 11 is located below the swing rod 1, and the second rotating shaft 7 can be arranged on the gear bracket 11 and extend outward along the two side walls in the width direction of the gear bracket 11. The gears 12 are covered below the gear bracket 11, and the driving force is transmitted to the rubber roller 9 through the meshing of the gears 12; the bottom surface of one end of the connecting rod 5 abuts against the upper surface of the gear bracket 11, and the bottom surface of the other end abuts against the lower bottom wall of the through hole 6013, and the abutting surfaces of the bottom surfaces at both ends are on the same horizontal line; that is, both ends of the connecting rod are supported by the inner walls of the gear bracket and the through hole respectively, and the supporting surfaces are at the same height. Adopting this structure can enable the connecting rod to be effectively supported during the forward and backward running process, maintain the stability of its running track, and avoid tilting and difficult resetting.

[0040] As shown in the attached Figure 2-3 figure, a notch 102 is provided on the rotation connection hole 101 of the present application. Specifically, the notch is located at the lower position. Adopting this structure, during the connection process between the rotation connection hole and the second rotating shaft, connection can be achieved through the deformation force of the notch. The setting of the notch can enable connection with the second rotating shaft by pressing the swing rod to expand the notch in a narrow space, making the connection more convenient and saving assembly space.

[0041] As shown in the attached Figure 7-9 figure, a PCB board 16 is provided inside the fixed housing 601 of the present application. An open cover inductor 17 is provided on the PCB board 16. The open cover inductor 17, also known as an open cover sensor, is located below the swing rod 1. When the swing rod 1 is pulled and tilted by the first elastic member 8, the swing rod 1 abuts against the open cover inductor 17; when the swing rod 1 is pushed back to the reset position by the connecting rod 5, the swing rod 1 separates from the open cover inductor 17. Adopting the above structure, when the printer is in the open cover state, at this time the swing rod is tilted and its lower end will abut against the open cover inductor to trigger the open cover inductor. It is continuously pressed and connected during opening, indicating that the printer is in the open cover state; when the printer is closed, under the pushing force of the connecting rod, the lower end of the swing rod moves away from the open cover inductor, indicating closing; the above structure can protect the safe operation of the printer. The PCB of the present application is a conventional PCB control board in the field, used to form a signal association with a calculator or a microprocessor to drive the functions of the printer. The open cover inductor of the present application can also adopt commercially available products, and a signal association is formed through the PCB and a calculator or a microprocessor.

[0042] As shown in the appendix Figure 2-3 As shown, the present application is provided with two second rotating shafts 7, which are symmetrically arranged on the left and right sides of the width direction of the gear bracket 11 respectively; through this setting, the swing rod can be supported through two positions, and it is more balanced and stable during the process of being pulled and tilted by the first elastic member, and the reset is also more accurate.

[0043] The first elastic member of the present application can be a tension spring structure, and the second elastic member of the present application can be a straight spring structure; in addition to the swing rod-related components of the present application inside the printer of the present application, there are also other structures such as rubber rollers, gear assemblies, PCBs, etc. that realize the printing function, which will not be elaborated in detail here.

[0044] The specific working principle and process of the printer of the present application are as follows: the rotating member of the present application is a sickle-shaped structure. After the rotating shell of the printer is closed, it will abut against the connecting rod and trigger the connecting rod to push towards the swing rod against the pressure of the second elastic member. The first guiding surface provided at this end of the connecting rod will drive the swing rod to rotate around the second rotating shaft provided on the gear bracket against the tension of the first elastic member, and finally make the print head close to the rubber roller. There is a torsion spring between the substrate and the swing rod during the pressing process, so that the print head pressing the rubber roller has a compensating elastic force, and the printing of the printing paper is clearer. At the same time, the motor drives the gear assembly to transmit the power to the rubber roller to evenly output and print the paper; after opening the cover, the rotating member disengages from the top push of the connecting rod. At this time, the second elastic member drives the connecting rod to retreat so that the connecting rod enters the groove, and the swing rod is pulled and rotated and tilted by the first elastic member again. At this time, a V-shaped gap with a wider upper part and a narrower lower part is formed between the print head and the rubber roller, which is convenient for putting the paper; in addition, during the process of the swing rod tilting and rotating, it will trigger the cover opening sensor, which is always pressed and connected when opening the cover to indicate opening the cover, and is far away from the cover opening sensor when closing the cover to indicate closing the cover.

Claims

1. A printer, comprising a printer housing (6), wherein the printer housing (6) comprises a fixed housing (601) and a rotating housing (602), wherein the fixed housing (601) and the rotating housing (602) are rotatably connected via a rotating member (603), wherein: It also comprises a swinging rod (1), a first rotating shaft (2), a base plate (3), a printing head (4) and a connecting rod (5); the base plate (3) is rotatably connected to the swinging rod (1) via the first rotating shaft (2), and the printing head (4) is arranged on the outer surface of the base plate (3); the swinging rod (1) is connected to the inner wall of the printer housing (6) at the bottom end via the second rotating shaft (7); A first elastic member (8) is also provided between the swing lever (1) and the inner wall of the printer housing (6), and the first elastic member (8) can drive the upper part of the swing lever (1) to tilt toward its lower part with the second rotating shaft (7) as a fulcrum; the connecting rod (5) is movably arranged in the printer housing (6), and the rotating member (603) is used to drive the connecting rod (5) to move and press against the swing lever (1).

2. The printer according to claim 1, characterized in that: When the rotating shell (602) rotates to cover the fixed shell (601), the rotating member (603) drives the connecting rod (5) to move to push the swinging rod (1) to overcome the driving force of the first elastic member (8), so that the swinging rod (1) rotates so that the print head (4) is close to the rubber roller (9); when the fixed shell (601) and the rotating shell (602) are opened, the rotating member (603) moves away from the connecting rod (5), and the connecting rod (5) is separated from the swinging rod (1), so that the upper part of the swinging rod (1) is tilted toward the lower part relative to the second rotating shaft (7).

3. The printer according to claim 1, characterized in that: A torsion spring (13) is sleeved on the first rotating shaft (2), and the torsion spring (13) is abutted between the base plate (3) and the swing rod (1).

4. The printer according to claim 1, characterized in that: The length extension direction of the first elastic member (8) is perpendicular to the axial direction of the second rotating shaft (7).

5. The printer according to claim 1, characterized in that: A first guide surface (501) is provided at one end of the connecting rod (5) close to the swing rod (1), and the first guide surface (501) is gradually inclined from top to bottom.

6. The printer according to claim 5, characterized in that: A second guide surface (502) is provided at one end of the connecting rod (5) away from the swing rod (1), and the second guide surface (502) is gradually inclined from top to bottom.

7. The printer according to claim 1, characterized in that: The fixed shell (601) comprises a lower shell (6011) and a middle shell (6012), wherein the middle shell (6012) covers the lower shell (6011), and the middle shell (6012) is provided with a through hole (6013) for the connecting rod (5) to pass through, and the connecting rod (5) enters into a groove (6014) where the rotating member (603) is located through the through hole (6013); a limit block (6015) is also provided on the middle shell (6012), and the limit block (6015) is inserted into the connecting rod (5), and a second elastic member (15) is abutted between the limit block (6015) and the connecting rod (5).

8. The printer according to claim 1, characterized in that: The swing rod (1) is provided with a rotation connection hole (101) sleeved with the second rotating shaft (7) at the bottom end thereof, and a notch (102) is provided on the rotation connection hole (101).

9. The printer according to claim 1, characterized in that: A PCB board (16) is arranged inside the fixed shell (601), and a cover opening sensor (17) is arranged on the PCB board (16). The cover opening sensor (17) is located below the swing arm (1). When the swing arm (1) is pulled and tilted by the first elastic member (8), the swing arm (1) abuts against the cover opening sensor (17); when the swing arm (1) is pushed and reset by the connecting rod (5), the swing arm (1) is separated from the cover opening sensor (17).

10. The printer according to claim 1, characterized in that: The second rotating shafts (7) are provided in two pieces, and are symmetrically arranged on the left and right sides of the gear bracket (11) in the width direction.

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