Printer

Abstract

The present application provides a printer. The printer comprises a rubber roller and a print head, the print head has a heating plane and a rotation axis, the heating plane is provided with a heating element, the print head is able to rotate around the rotation axis so as to move towards or away from the rubber roller, and the print head work in conjunction with the rubber roller so as to load print media of different thicknesses; when the heating plane is in contact with the rubber roller, the heating plane is in line contact with the rubber roller and forms a first contact line, wherein the rotation axis is located on the heating plane; or, the rotation axis is located on one side of the heating plane, the distance between the rotation axis and the heating plane is X, the distance between the projection of the rotation axis on the heating plane and the first contact line is L, and 0<X≤1 / 3L.

Description

A printer

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 2025102163302, filed on February 26, 2025, entitled "A Printer", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of printing equipment technology, and in particular to a printer. Background Technology

[0004] When a printer prints on thermal label paper or other printing media, the printing media is sandwiched between the printer's print head and the printing roller. The print head is equipped with heating elements that heat the printing media, thereby enabling the printing of information.

[0005] In related technologies, printers are prone to insufficient print clarity when printing on media of different thicknesses. Summary of the Invention

[0006] This application provides a printer that can effectively improve print clarity when printing on media of varying thicknesses.

[0007] This application provides a printer including a rubber roller and a printhead. The printhead has a heating plane and a rotation axis. The heating plane is provided with heating lines. The printhead can rotate around the rotation axis to move closer to or further away from the rubber roller. The printhead cooperates with the rubber roller to load printing media of different thicknesses. When the heating plane is in contact with the rubber roller, the heating plane and the rubber roller make line contact and form a first contact line. The rotation axis is located on the heating plane; or, the rotation axis is located on one side of the heating plane, and the distance between the rotation axis and the heating plane is X, and the distance between the projection of the rotation axis on the heating plane and the first contact line is L, where 0 < X ​​≤ 1 / 3L.

[0008] The solution provided in this application embodiment, by setting the rotation axis on the heating plane, or setting it on one side of the heating plane and at a predetermined distance from the heating plane, can control the degree of offset between the heating line and the first contact line within a suitable range when printing on printing media of different thicknesses, so that the heating line and the first contact line at least partially overlap, avoiding the situation where the first contact line and the heating line are completely misaligned, thereby improving the clarity of the print.

[0009] In some possible implementations, the heating wire is closer to the axis of rotation than the first contact wire.

[0010] In some possible implementations, the distance between the heating wire and the first contact wire is greater than or equal to 0.01 mm and less than or equal to 0.2 mm.

[0011] In some possible implementations, the heating wire is a long strip structure with a width greater than or equal to 0.3 mm and less than or equal to 0.8 mm.

[0012] In combination with the above implementation methods, in some possible implementation methods, the heating wire is further away from the rotation axis than the first contact wire, and the distance between the heating wire and the first contact wire is greater than 0 and less than or equal to 0.1 mm.

[0013] In some possible implementations, in conjunction with the above implementations, the print head includes: a rotating shaft having the rotation axis; a support frame rotatably connected to the rotating shaft; a mounting plate rotatably connected to the rotating shaft and rotatable relative to the support frame, the mounting plate having the heating plane; and an elastic element disposed between the support frame and the mounting plate; wherein, when the heating plane contacts the rubber roller, the mounting plate can compress the elastic element and rotate about the rotation axis toward the support frame.

[0014] In some possible implementations, in conjunction with the above implementations, the support frame has a first protrusion on the side near the mounting plate; the mounting plate has a second protrusion on the side near the support frame; one end of the elastic member is connected to the first protrusion, and the other end is connected to the second protrusion.

[0015] In some possible implementations, in conjunction with the above implementations, the number of elastic elements is multiple, and the multiple elastic elements are symmetrically arranged about a plane of symmetry; wherein, the plane of symmetry is a plane perpendicular to the axis of rotation and passing through the geometric center of the mounting plate.

[0016] In some possible implementations, in conjunction with the above implementations, the mounting plate is provided with an oblong hole passing through the rotating shaft, and the length direction of the oblong hole is perpendicular to the heating wire.

[0017] In conjunction with the above implementation methods, in some possible implementations, the printer further includes: a bracket, rotatably connected to the print head; the print head having a retracted position and a printing position relative to the bracket; a drive member configured to drive the print head to switch from the retracted position to the printing position; and a reset elastic member disposed between the print head and the bracket to drive the print head to reset from the printing position to the retracted position when the drive member disengages from the print head.

[0018] In some possible implementations, in conjunction with the above implementation methods, the reset elastic element is a torsion spring, which is sleeved on one end of the rotating shaft, with one end of the torsion spring pressing against the bracket and the other end pressing against the support frame.

[0019] In some possible implementations, in conjunction with the above implementations, when the print head is in the printing position, the drive unit contacts the support frame line and forms a second contact line; the second contact line is parallel to the heating wire body. Attached Figure Description

[0020] Figure 1 is a partial structural schematic diagram of a printer provided in an embodiment of this application;

[0021] Figure 2 is a right view of the printer in Figure 1 without the driver component;

[0022] Figure 3 is a schematic diagram of the printhead structure in the printer shown in Figure 1;

[0023] Figure 4 is a schematic diagram of the exploded structure of the printhead in Figure 3;

[0024] Figure 5 is a bottom view of the printhead in Figure 3 without the support frame.

[0025] The annotations in the attached figures are explained as follows:

[0026] 100—Printer;

[0027] 1—rubber roller; 11—first contact line;

[0028] 2—Print head;

[0029] 21—Mounting plate; 210—Heating plane; 211—Heating wire; 212—Second protrusion; 213—Oval hole;

[0030] 22—shaft; 220—axis of rotation;

[0031] 23—Support frame; 231—First protrusion;

[0032] 24—Elastic element;

[0033] 3—Drive components;

[0034] 4—Reset elastic element;

[0035] L—plane of symmetry; X—length direction of the oblong hole. Embodiments of the present invention

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] When a printer prints on thermal label paper or other printing media, the printing media is sandwiched between the printer's print head and the printing roller. The print head is equipped with heating elements that heat the printing media, thereby enabling the printing of information.

[0038] In related technologies, printers are prone to insufficient print clarity when printing on media of different thicknesses.

[0039] To address the aforementioned technical problems, this application provides a printer. The following is a detailed description of one embodiment of this application with reference to the accompanying drawings.

[0040] Referring to Figures 1 and 2, a printer 100 proposed in this application includes a rubber roller 1 and a print head 2. The print head 2 has a heating plane 210 and a rotation axis 220. The heating plane 210 is provided with heating lines 211. The print head 2 can rotate around the rotation axis 220 to move closer to or further away from the rubber roller 1. The print head 2 cooperates with the rubber roller 1 and can load printing media of different thicknesses. When the heating plane 210 is in contact with the rubber roller 1, the heating plane 210 and the rubber roller 1 make line contact and form a first contact line 11. The rotation axis 220 is located on the heating plane 210; or, the rotation axis 220 is located on one side of the heating plane 210, and the distance between the rotation axis 220 and the heating plane 210 is X, and the distance between the projection of the rotation axis 220 on the heating plane 210 and the first contact line 11 is L, where 0 < X ​​≤ 1 / 3L.

[0041] First, it should be noted that, in order to adapt to printing media of different thicknesses, as shown in Figures 1 and 2, the printer in the exemplary technology allows the print head 2 to rotate relative to the roller 1 about the rotation axis 220. Therefore, the movement trajectory of the heating line 211 on the print head 2 is arc-shaped. Before the printing media is loaded between the print head 2 and the roller 1, the heating plane 210 on the print head 2 makes line contact with the roller 1 and forms a first contact line 11.

[0042] The applicant's research revealed, as shown in Figure 2, that after the printing medium is loaded between the printhead 2 and the roller 1, the printing medium causes the printhead 2 to rotate away from the roller 1. This causes the heating wire 211 on the printhead 2 to shift relative to the first contact wire 11, and the shift increases with the thickness of the printing medium. When the shift exceeds a certain critical value, the printer will exhibit insufficient print sharpness. In other words, when using printing media within a certain thickness range, such as 0.025mm to 0.12mm, the printer will not experience insufficient sharpness. However, when using printing media thicker than this range, such as those thicker than 0.12mm, the printer will exhibit insufficient sharpness, and the sharpness will decrease further with increasing thickness until it fails to meet the usage requirements.

[0043] The applicant's further research revealed that, for printing media of the same thickness, the distance between the rotation axis 220 of the printhead 2 and the heating plane 210 on the printhead 2 affects the printer's print clarity.

[0044] The applicant, through in-depth analysis of the underlying reasons, discovered that the distance between the heating wire 211, which is positioned on the heating plane 210, and the rotation axis 220 of the print head 2, and the heating plane 210 on the print head 2 determines the radius of rotation between the heating wire 211 on the heating plane 210 and the rotation axis 220. The larger this radius of rotation, the greater the degree of offset of the heating wire 211 relative to the first contact line 11. This radius of rotation is jointly determined by the distance X between the rotation axis 220 and the heating plane 210, the projection of the rotation axis 220 onto the heating plane 210, and the distance L between the first contact line 11.

[0045] For example, if the distance L between the projection of the rotation axis 220 on the heating plane 210 and the first contact line 11 is 45mm, for a printing medium with a thickness of 0.2mm, under the condition that other conditions remain unchanged, when the distance between the rotation axis 220 of the print head 2 and the heating plane 210 on the print head 2 is 1 / 9L, i.e. 5mm, after loading the printing medium, the distance by which the heating line 211 is offset relative to the first contact line 11 is 0.04mm.

[0046] When the distance between the rotation axis 220 of the printhead 2 and the heating plane 210 on the printhead 2 is 1 / 3L, i.e. 15mm, after loading the printing medium, the distance by which the heating line 211 is offset relative to the first contact line 11 is 0.09mm.

[0047] It can be seen that, while keeping the distance L between the projection of the rotation axis 220 on the heating plane 210 and the first contact line 11 constant, as the distance between the rotation axis 220 of the print head 2 and the heating plane 210 on the print head 2 increases, that is, as the rotation radius between the heating line 211 on the heating plane 210 and the rotation axis 220 increases, the printing clarity of the printer will gradually decrease until it can no longer meet the usage requirements, resulting in insufficient printing clarity.

[0048] Based on the above research results, in one embodiment of this application, the rotation axis 220 is set on the heating plane 210. In this way, the distance between the rotation axis 220 of the print head 2 and the heating plane 210 on the print head 2 is 0, and the rotation radius between the heating line 211 on the heating plane 210 and the rotation axis 220 is minimized. When loading the printing medium, the degree of offset of the heating line 211 relative to the first contact line 11 can be minimized, thereby obtaining the best printing effect.

[0049] However, considering the limitations of other conditions on the printer 100 in practical applications, such as the arrangement of other components, another embodiment of this application sets the rotation axis 220 on one side of the heating plane 210, and the distance between the rotation axis 220 and the heating plane 210 is X, and the distance between the projection of the rotation axis 220 on the heating plane 210 and the first contact line 11 is L, 0 < X ​​≤ 1 / 3L. Thus, although the distance between the rotation axis 220 of the print head 2 and the heating plane 210 on the print head 2 is 0, the increase in the rotation radius between the heating line 211 on the heating plane 210 and the rotation axis 220 is small. This allows for a smaller degree of offset of the heating line 211 relative to the first contact line 11 when loading the printing medium, thereby ensuring a controllable degree of offset of the heating line 211 relative to the first contact line 11. This guarantees that the printer 100 will not experience insufficient clarity during printing, meeting the usage requirements of the printer 100.

[0050] In summary, the solution provided by the embodiments of this application, by setting the rotation axis 220 on the heating plane 210, or setting it on one side of the heating plane 210 and at a predetermined distance from the heating plane 210, can control the degree of offset between the heating line 211 and the first contact line 11 within a suitable range when printing on printing media of different thicknesses, so that the heating line 211 and the first contact line 11 at least partially overlap, avoiding the situation where the first contact line 11 and the heating line 211 are completely misaligned, thereby improving the clarity of printing.

[0051] Referring to Figures 2 and 3, considering that the first contact line 11 will shift towards the rotation axis 220 after the printing media is loaded between the print head 2 and the roller 1, in some embodiments, the heating line 211 is closer to the rotation axis 220 than the first contact line 11. That is, before loading the printing media, the heating line 211 is pre-staggered from the first contact line 11 by a certain distance. Thus, after loading the printing media, the first contact line 11 will shift towards the rotation axis 220, compensating for the pre-staggered distance. This makes the heating line 211 closer to the first contact line 11 after loading the printing media, thereby further improving print clarity.

[0052] Since there are many types of printing media thicknesses, such as 0.025mm, 0.04mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, etc., when the heating wire 211 is set closer to the rotation axis 220 than the first contact wire 11, the distance between the heating wire 211 and the first contact wire 11 needs to be set reasonably to prevent overcompensation.

[0053] Considering that if the distance between the heating line 211 and the first contact line 11 is too large compared to the thickness of commonly used printing media, then after loading a thinner printing medium between the print head 2 and the roller 1, the offset of the first contact line 11 towards the rotation axis 220 will be too small compared to the distance between the heating line 211 and the first contact line 11. In this case, the heating line 211 cannot get closer to the first contact line 11, which will lead to insufficient printing clarity. Therefore, in some embodiments, the distance between the heating line 211 and the first contact line 11 can be greater than or equal to 0.01 mm and less than or equal to 0.2 mm. For example, it can be 0.01 mm, 0.02 mm, 0.025 mm, 0.04 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, etc. In this way, offset compensation for commonly used thickness printing media can be met, effectively avoiding insufficient printing clarity.

[0054] Considering that a width greater than 0.8mm would result in lower print resolution, while a width less than 0.3mm would make it difficult to eliminate the impact of significant offset between the heating line 211 and the first contact line 11 on print clarity, in this embodiment, the heating line 211 is a long strip structure with a width greater than or equal to 0.3mm and less than or equal to 0.8mm. For example, it can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, or 0.8mm. This not only ensures a high print resolution but also guarantees that the first contact line 11 at least partially overlaps with the heating line 211 even with significant offset, further reducing the impact of the offset on print clarity.

[0055] In practical applications, the heating line 211 of the printhead 2 and the first contact line 11 of the roller 1 may shift due to the influence of processing accuracy and assembly errors. To reduce the impact of this shift on print clarity, in some embodiments of this application, the amount of shift is controlled. That is, in some embodiments, the heating line 211 is controlled to be further away from the rotation axis 220 than the first contact line 11. Meanwhile, considering that the first contact line 11 will shift towards the rotation axis 220 after the printing medium is loaded between the printhead 2 and the roller 1, and due to the uncertainty of processing accuracy and assembly errors, to avoid excessive shift between the heating line 211 and the first contact line 11, affecting the print clarity of the printer 100, embodiments of this application also limit the distance between the heating line 211 and the first contact line 11 when controlling the heating line 211 to be further away from the rotation axis 220. The distance between them is controlled to be within a small range. Specifically, the distance between the heating line 211 and the first contact line 11 is greater than 0 and less than or equal to 0.1 mm. For example, the thickness can be 0.01mm, 0.02mm, 0.03mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc. This reduces the impact of machining accuracy and assembly errors, improves the printing clarity of the printer 100, and prevents excessive offset between the heating line 211 and the first contact line 11, which could affect the printing clarity of the printer 100.

[0056] The printhead 2 can have various structural forms. Referring to Figure 4, in some embodiments, the printhead 2 may include a rotating shaft 22, a support frame 23, a mounting plate 21, and an elastic element 24. The rotating shaft 22 has a rotation axis 220, and the support frame 23 is rotatably connected to the rotating shaft 22; the mounting plate 21 is rotatably connected to the rotating shaft 22 and can rotate relative to the support frame 23, and the mounting plate 21 has a heating surface 210; the elastic element 24 is disposed between the support frame 23 and the mounting plate 21; wherein, when the heating surface 210 is in contact with the rubber roller 1, the mounting plate 21 can compress the elastic element 24 and rotate about the rotation axis 220 toward the support frame 23. The elastic element 24 may be a tension spring, compression spring, sheet spring, rubber spring, etc. Before loading the printing media, the mounting plate 21 can contact the rubber roller 1 under the elastic force of the elastic element 24. After loading the printing media, the mounting plate 21 can cooperate with the rubber roller 1 to clamp the printing media under the elastic force of the elastic element 24. When printing media of different thicknesses are placed between the rubber roller 1 and the mounting plate 21, the elastic element 24 can automatically extend and retract adaptively, thereby moving the mounting plate 21 closer to or further away from the support frame 23, ensuring that printing media of different thicknesses are in the appropriate position between the print head 2 and the rubber roller 1.

[0057] Referring to Figures 4 and 5, in some embodiments, the support frame 23 has a first protrusion 231 on the side near the mounting plate 21; the mounting plate 21 has a second protrusion 212 on the side near the support frame 23; one end of the elastic member 24 is connected to the first protrusion 231, and the other end is connected to the second protrusion 212.

[0058] Understandably, the first protrusion 231 on the support frame 23 and the second protrusion 212 on the mounting plate 21 provide a mounting base for the elastic element 24. The first protrusion 231 and the second protrusion 212 can have various structural forms, and their structures can be the same or different. As shown in Figures 4 and 5, when the elastic element 24 is a telescopic spring, the first protrusion 231 can be an outwardly convex arc-shaped structure, and the second protrusion 212 can be an outwardly convex cross-shaped structure. The outer contours of both the first protrusion 231 and the second protrusion 212 are adapted to the inner diameter of the telescopic spring. Therefore, one end of the elastic element 24 can be fitted onto the first protrusion 231, and the other end can be fastened to the second protrusion 212, achieving effective positioning and reliable connection of the elastic element 24 between the support frame 23 and the mounting plate 21.

[0059] In some embodiments, the number of elastic elements 24 is multiple, and the multiple elastic elements 24 are symmetrically arranged about the plane of symmetry L; wherein, the plane of symmetry L is a plane perpendicular to the axis of rotation 220 and passing through the geometric center of the mounting plate 21. The number of elastic elements 24 can be four as shown in Figure 4, or two, six, eight, etc., and the designer can flexibly set the number of elastic elements 24 according to actual needs.

[0060] This embodiment of the application, by symmetrically arranging multiple elastic elements 24, ensures that the mounting plate 21 is subjected to uniform force, which can avoid uneven pressure on the printing medium between the print head 2 and the printer, thus preventing uneven printing density and preventing inconsistent printing density of the printer 100, thereby further improving the printing effect of the printer 100.

[0061] Due to installation errors and other reasons, the rubber roller 1 of the printer 100 may tilt relative to the mounting plate 21, thereby affecting the printing quality of the printer 100. To mitigate the impact of the rubber roller 1's tilt on printing quality, in some embodiments, the mounting plate 21 is provided with a waist-shaped hole 213 passing through the rotating shaft 22. The length direction X of the waist-shaped hole 213 is perpendicular to the heating line 211. The fact that the length direction X of the waist-shaped hole 213 is perpendicular to the heating line 211 ensures that the mounting plate 21 is adjusted in a direction perpendicular to the heating line 211. The length of the waist-shaped hole 213 can be determined based on the travel distance of the rotating shaft 22 caused by the tilt of the rubber roller 1.

[0062] This embodiment of the application can adaptively adjust the relative position of the mounting plate 21 and the rubber roller 1 under the action of the elastic member 24, so that the mounting plate 21 and the rubber roller 1 are closely fitted together, thereby making the heating wire 211 on the mounting plate 21 parallel to the first contact line 11, and automatically improving the impact of the tilt of the rubber roller 1 on the print quality. For example, referring to FIG4, when the left side of the rubber roller 1 tilts upward, the left side of the mounting plate 21 will be lifted upward under the action of the elastic member 24 and come into contact with and fit against the rubber roller 1, so that the heating wire 211 on the mounting plate 21 is parallel to the first contact line 11, effectively improving the impact of the tilt of the rubber roller 1 on the print quality.

[0063] Referring to Figure 1, in some embodiments, the printer 100 may further include a bracket (not shown), a drive member 3, and a reset elastic member 4. The bracket is rotatably connected to the print head 2; the print head 2 has a retracted position and a printing position relative to the bracket; the drive member 3 is configured to drive the print head 2 to switch from the retracted position to the printing position; the reset elastic member 4 is disposed between the print head 2 and the bracket to drive the print head 2 to reset from the printing position to the retracted position when the drive member 3 disengages from the print head 2.

[0064] The bracket is configured to provide a mounting base for the print head 2, which can rotate relative to the bracket. When the printer 100 is in the power-off reset state, the print head 2 is in the retracted position, separated from the rubber roller 1 and moved away from the rubber roller 1 by a preset distance. When the printer 100 is in the printing state, the print head 2 is in the printing position and cooperates with the rubber roller 1 to hold the printing medium. The drive component 3 can have various structural forms, such as a cam-like structure as shown in Figure 3, or it can be a chain drive mechanism, gear drive mechanism, etc. The drive component 3 can be driven by a power source such as a motor or cylinder. The reset elastic component 4 is configured to apply a restoring force to the print head 2 when the drive component 3 disengages from the print head 2 after printing is completed, so that the print head 2 returns from the printing position to the retracted position.

[0065] The reset elastic element 4 can be a torsion spring, which is sleeved on one end of the rotating shaft 22. One end of the torsion spring presses against the bracket, and the other end presses against the print head 2. Thus, when the driving element 3 disengages from the print head 2, it can drive the print head 2 to reset from the printing position to the retracted position. The torsion spring being sleeved on one end of the rotating shaft 22 allows it to be located at the edge of the print head 2, facilitating its installation.

[0066] As described above, the printhead 2 includes a mounting plate 21 and a support frame 23. The mounting plate 21 and the support frame 23 are rotatably connected, and an elastic element 24 is provided between them. Theoretically, the other end of the torsion spring can press against either the mounting plate 21 or the support frame 23. However, considering that the mounting plate 21 and the support frame 23 are rotatably connected, and that an elastic element 24 is provided between the support frame 23 and the mounting plate 21, if the other end of the torsion spring presses against the mounting plate 21, when the printhead 2 is in the printing position, the elastic force exerted by the other end of the torsion spring on the mounting plate 21 will offset part of the elastic force exerted by the elastic element 24 on the mounting plate 21. This results in the elastic force exerted by the elastic element 24 on the side of the mounting plate 21 closer to the torsion spring being less than the elastic force exerted by the elastic element 24 on the side of the mounting plate 21 farther from the torsion spring. Consequently, the pressure between the mounting plate 21 and the roller 1 becomes uneven, thus affecting the printing effect of the printer 100. If the other end of the torsion spring presses against the support frame 23, the support frame 23 of the print head 2 located at the printing position can be reliably supported by the drive member 3, thus avoiding the influence of the elastic force applied to the support frame 23 by the other end of the torsion spring. Therefore, referring to Figure 1, in some embodiments of this application, the other end of the torsion spring is set to press against the support frame 23, thereby avoiding affecting the normal operation of the elastic member 24 and enabling the printer 100 to obtain better printing results.

[0067] Referring to Figure 1, in some embodiments, when the print head 2 is in the printing position, the drive member 3 makes line contact with the support frame 23 and forms a second contact line; the second contact line is parallel to the heating line 211.

[0068] It is understandable that during the process of the drive unit 3 driving the print head 2 to switch from the retracted position to the printing position, it applies force to the print head 2 by contacting the support frame 23. As shown in Figure 1, the drive unit 3 drives the support frame 23 to lift, thereby moving the print head 2 to the printing position.

[0069] In this embodiment, when the print head 2 is in the printing position, making the second contact line between the drive member 3 and the support frame 23 parallel to the heating line 211 on the mounting plate 21 of the print head 2 can reduce the probability of the print head 2 tilting, thereby reducing the probability of the heating line 211 and the first contact line 11 on the rubber roller 1 being completely misaligned due to the tilt of the print head 2, effectively improving the printing clarity of the printer 100.

[0070] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A printer, wherein, include: Rubber rollers; and The printhead has a heating plane and a rotation axis. The heating plane is provided with heating lines. The printhead can rotate around the rotation axis to move closer to or further away from the rubber roller. The printhead cooperates with the rubber roller to load printing media of different thicknesses. When the heating plane is in contact with the rubber roller, the heating plane makes line contact with the rubber roller and forms a first contact line. Before loading the printing media, the heating line is offset from the first contact line; The distance between the rotation axis and the heating plane is 0; or, the rotation axis is located on one side of the heating plane, and the distance between the rotation axis and the heating plane is X, and the distance between the projection of the rotation axis on the heating plane and the first contact line is L, 0 < X ​​≤ 1 / 3L.

2. The printer according to claim 1, wherein, The heating wire is closer to the axis of rotation than the first contact wire.

3. The printer according to claim 2, wherein, The distance between the heating wire and the first contact wire is greater than or equal to 0.01 mm and less than or equal to 0.2 mm.

4. The printer according to claim 2, wherein, The heating wire is a long strip structure, and the width of the heating wire is greater than or equal to 0.3 mm and less than or equal to 0.8 mm.

5. The printer according to claim 1, wherein, The heating wire is further away from the rotation axis than the first contact wire, and the distance between the heating wire and the first contact wire is greater than 0 and less than or equal to 0.1 mm.

6. The printer according to claim 1, wherein, The printhead includes: A rotating shaft having the aforementioned axis of rotation; The support frame is rotatably connected to the rotating shaft; A mounting plate, rotatably connected to the rotating shaft and rotatable relative to the support frame, the mounting plate having the heating plane; and An elastic element is disposed between the support frame and the mounting plate; When the heating plane is in contact with the rubber roller, the mounting plate can compress the elastic element and rotate about the rotation axis toward the support frame.

7. The printer according to claim 6, wherein, The support frame has a first protrusion on the side near the mounting plate; The mounting plate has a second protrusion on the side near the support frame; One end of the elastic element is connected to the first protrusion, and the other end is connected to the second protrusion.

8. The printer according to claim 6, wherein, The number of elastic elements is multiple, and the multiple elastic elements are symmetrically arranged about the plane of symmetry. The plane of symmetry is a plane that is perpendicular to the axis of rotation and passes through the geometric center of the mounting plate.

9. The printer according to claim 6, wherein, The mounting plate has an oblong hole passing through the rotating shaft, and the length direction of the oblong hole is perpendicular to the heating wire.

10. The printer according to claim 6, wherein, The printer also includes: A bracket is rotatably connected to the print head; the print head has a retracted position and a printing position relative to the bracket. A driver, configured to drive the printhead to switch from the retracted position to the printing position; and A reset elastic element is disposed between the print head and the bracket to drive the print head to reset from the printing position to the retracted position when the drive element disengages from the print head.

11. The printer according to claim 10, wherein, The reset elastic element is a torsion spring, which is sleeved on one end of the rotating shaft. One end of the torsion spring presses against the bracket, and the other end presses against the support frame.

12. The printer according to claim 10, wherein, When the print head is in the printing position, the drive unit contacts the support frame line and forms a second contact line; The second contact line is parallel to the heating wire body.

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