Thermal printing head and printer
By arranging a limiting plate on the substrate of the thermal print head to limit the elastic member, the problem of uneven heat dissipation caused by limiting protrusions or grooves is solved, and the printing quality is improved.
Patent Information
- Application Number
- CN202423085588.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In existing thermal print heads, the provision of limiting protrusions or limiting grooves on the substrate causes uneven heat dissipation of the head chip, thus affecting the printing quality.
A limiting plate is provided on the other end surface of the substrate to limit the elastic member through the limiting plate to prevent the elastic member from shifting, thereby improving its working stability and improving the heat dissipation uniformity of the head piece.
The design of the limiting plate avoids protrusions or grooves on the substrate, improves the stability of the elastic part and the heat dissipation uniformity of the print head, thereby improving the printing quality.
Smart Images
Figure CN223355235U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of printers, in particular to a thermal print head and a printer. Background Art
[0002] Thermal transfer printers, thermal sublimation printers, and thermal printers all require a thermal print head. The specific structure of a thermal print head typically includes a frame, a rubber roller, and a print head assembly. The rubber roller is mounted on the frame and is spaced and parallel to the back plate on the frame. The print head assembly is mounted on the frame and located between the rubber roller and the back plate. The print head assembly includes a substrate, a head chip mounted on one side of the substrate, and an elastic member. The substrate is mounted on the frame, and the elastic member is positioned between the other side of the substrate and the back plate. The elastic member can drive the substrate to move, so that the head chip presses against the carbon ribbon on the rubber roller.
[0003] Among them, in order to fix the elastic part, a limiting protrusion or limiting groove is usually punched out on the other side of the substrate so that one end of the elastic part can be sleeved on the limiting protrusion or inserted into the limiting groove. However, when a limiting protrusion or limiting groove appears on the other side of the substrate, a corresponding limiting groove or limiting protrusion will appear on one side of the substrate, and the head piece is set on one side of the substrate, which makes the heat dissipation of the head piece uneven, and shadow spots will appear on the head piece at the position of the limiting groove or limiting protrusion, which will affect the printing quality.
[0004] Therefore, a thermal print head is urgently needed to solve the above problems. Utility Model Content
[0005] The purpose of the present utility model is to provide a thermal print head and a printer to solve the problem in the related art that when a limiting protrusion or a limiting groove is set on a substrate, the head piece will produce shadow spots at the corresponding positions of the limiting protrusion or the limiting groove, thereby affecting the printing quality.
[0006] In one aspect, the present invention provides a thermal print head, comprising:
[0007] Rack, including backplane;
[0008] A rubber roller, the rubber roller is arranged on the frame and spaced apart from the back plate;
[0009] A print head assembly is arranged between the back plate and the rubber roller. The print head assembly includes a substrate, a head piece, an elastic part and a limit plate. The head piece is arranged on one end face of the substrate, and an elastic part is arranged between the other end face of the substrate and the back plate. The elastic part is used to drive the substrate to move so that the head piece has a tendency to approach the rubber roller. The limit plate is attached to the other end face of the substrate, and the limit plate is used to limit the elastic part.
[0010] As an optimal technical solution for the thermal print head, the limiting plate is provided with a limiting hole corresponding to the elastic member, the axis of the limiting hole is arranged perpendicular to the other end face of the substrate, and one end of the elastic member is inserted into the corresponding limiting hole.
[0011] As an optimal technical solution for the thermal print head, the side wall of the limiting plate perpendicular to the other end face of the substrate is recessed with a limiting slot corresponding to the elastic member, and the limiting slot passes through the limiting plate in a direction perpendicular to the end face of the substrate, and one end of the elastic member is inserted into the corresponding limiting slot.
[0012] As a preferred technical solution of the thermal print head, a bending portion is provided on a side of the substrate close to the notch of the limiting slot, and the bending portion is bent toward a side close to the limiting plate.
[0013] As a preferred technical solution of the thermal print head, the limiting plate includes a plate body and a limiting protrusion protruding from the plate body, and the limiting protrusion is plugged into the corresponding elastic member.
[0014] As a preferred technical solution of the thermal print head, the wall surface of the limiting plate perpendicular to the end surface of the substrate is the first side wall, and the wall surface of the substrate perpendicular to the end surface of the substrate is the second side wall;
[0015] At least two adjacent first side walls are flush with at least two adjacent second side walls in a one-to-one correspondence.
[0016] As a preferred technical solution of the thermal print head, a plurality of elastic members are provided, and the plurality of elastic members are spaced apart along the length direction of the substrate.
[0017] As an optimal technical solution for the thermal print head, the limiting plate and the base plate are glued and fixed.
[0018] As a preferred technical solution for the thermal print head, the limiting plate is a plastic part with one side coated with glue.
[0019] On the other hand, the present invention provides a printer comprising the thermal print head of any of the above solutions.
[0020] The beneficial effects of the utility model are:
[0021] The utility model provides a thermal print head and a printer, wherein the thermal print head includes a frame, a rubber roller and a print head assembly, wherein the frame includes a back plate; the rubber roller is arranged on the frame and spaced apart from the back plate; the print head assembly is arranged between the back plate and the rubber roller, and the print head assembly includes a substrate, a head piece, an elastic member and a limiting plate, wherein the head piece is arranged on one end face of the substrate, and an elastic member is arranged between the other end face of the substrate and the back plate, and the elastic member is used to drive the substrate to move so that the head piece has a tendency to approach the rubber roller, and the limiting plate is attached to the other end face of the substrate, and the limiting plate is used to limit the elastic member. In the thermal print head, by arranging a limiting plate on the other end face of the substrate, the elastic member is limited, the elastic member is avoided from shifting, and the working stability of the elastic member is improved. At the same time, the stamping of protrusions or grooves on the substrate is avoided, thereby improving the problem of uneven heat dissipation of the head piece and improving the printing quality of the printer. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic structural diagram of a thermal print head in an embodiment of the present utility model;
[0023] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;
[0024] Figure 3 for Figure 1 A partial enlarged view of point A in the middle;
[0025] Figure 4 This is a schematic diagram of the assembly of the base plate, the limiting plate and the elastic member in the embodiment of the present utility model;
[0026] Figure 5 This is a schematic structural diagram of a limit plate in an embodiment of the present utility model;
[0027] Figure 6 for Figure 1 A partial enlarged view of point A in the middle.
[0028] In the picture:
[0029] 1. Frame; 11. Back plate; 111. Position limiting protrusion; 12. Side support plate;
[0030] 2. Rubber roller;
[0031] 31. Base plate; 311. Second side wall; 312. Bending portion; 32. Head piece; 33. Elastic member; 34. Limiting plate; 341. Limiting slot; 342. First side wall. DETAILED DESCRIPTION
[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.
[0036] Example 1
[0037] like Figures 1 to 6As shown, this embodiment provides a thermal print head, which includes a frame 1, a rubber roller 2, and a print head assembly. The frame 1 includes a back plate 11; the rubber roller 2 is arranged on the frame 1 and spaced apart from the back plate 11; the print head assembly is arranged between the back plate 11 and the rubber roller 2. The print head assembly includes a substrate 31, a head chip 32, an elastic member 33, and a limiting plate 34. The head chip 32 is arranged on one end surface of the substrate 31, and the elastic member 33 is arranged between the other end surface of the substrate 31 and the back plate 11. The elastic member 33 is used to drive the substrate 31 to move so that the head chip 32 has a tendency to approach the rubber roller 2. The limiting plate 34 is attached to the other end surface of the substrate 31 and is used to limit the elastic member 33. In this thermal print head, by providing the limiting plate 34 on the other end surface of the substrate 31, the elastic member 33 is limited, thereby preventing the elastic member 33 from shifting and improving the working stability of the elastic member 33. At the same time, it avoids stamping protrusions or grooves on the substrate 31, thereby improving the problem of uneven heat dissipation of the head chip 32 and improving the printing quality of the printer.
[0038] Optionally, the frame 1 further includes two side support plates 12, which are respectively arranged at the two ends of the back plate 11 along the length direction of the back plate 11 and are arranged to form a U-shaped structure with the back plate 11. The two ends of the rubber roller 2 are respectively rotatably engaged with the two side support plates 12, so that the rubber roller 2 can rotate relative to the frame 1. The print head assembly is arranged between the rubber roller 2 and the back plate 11, and the base plate 31 is pivotally connected to the two side layers so that the base plate 31 can swing relative to the frame 1, thereby making the head piece 32 arranged on one end face of the base plate 31 have two states: close to the rubber roller 2 and away from the rubber roller 2. The elastic member 33 is arranged between the base plate 31 and the back plate 11, so that the elastic force of the elastic member 33 can drive the base plate 31 to swing, so that the head piece 32 always has a tendency to move closer to the rubber roller 2, so that the head piece 32 presses the carbon ribbon onto the rubber roller 2. In other embodiments, the two ends of the base plate 31 may be respectively slidably engaged with the two side support plates 12 , so that the base plate 31 can slide in two directions, namely, close to the rubber roller 2 and away from the rubber roller 2 .
[0039] Optionally, the elastic member 33 is a compression spring.
[0040] Regarding the specific structure of the limiting plate 34 limiting the position of the elastic member 33, optionally, a limiting slot 341 corresponding to the elastic member 33 is recessed on the sidewall of the limiting plate 34 on the other end surface perpendicular to the base plate 31. The limiting slot 341 extends through the limiting plate 34 in a direction perpendicular to the end surface of the base plate 31, and one end of the elastic member 33 is inserted into the corresponding limiting slot 341. In this embodiment, one end of the elastic member 33 is inserted into the limiting slot 341 along the recessed direction of the limiting slot 341, so that the limiting slot 341 limits the position of one end of the elastic member 33. The opening of the limiting slot 341 is located on the sidewall of the limiting plate 34 on the other end surface perpendicular to the base plate 31. This configuration reduces the difficulty of installing one end of the elastic member 33 and improves the efficiency of installing the elastic member 33. Moreover, this configuration only requires cutting the limiting plate 34 to obtain the limiting slot 341, which simplifies the manufacturing process of the limiting plate 34 and improves the processing efficiency of the limiting plate 34.
[0041] Optionally, a bending portion 312 is provided on one side of the substrate 31 near the notch of the limiting slot 341, and the bending portion 312 bends toward the side near the limiting plate 34. In this embodiment, the bending portion 312 is opposite to the notch of the limiting slot 341, thereby preventing the elastic member 33 from sliding out of the notch. Specifically, the distance between the bending portion 312 and the limiting plate 34 is less than the diameter of the elastic member 33. In addition, the substrate 31 is a sheet metal part, which is easily deformed. In this embodiment, the bending portion 312 is bent on the substrate 31, thereby improving the overall rigidity of the substrate 31, making the substrate 31 less susceptible to bending and deformation.
[0042] Optionally, the wall of the limiting plate 34 perpendicular to the end face of the substrate 31 is the first side wall 342, and the wall of the substrate 31 perpendicular to the end face of the substrate 31 is the second side wall 311; at least two adjacent first side walls 342 are flush with at least two adjacent second side walls 311 in a one-to-one correspondence. In this embodiment, after the limiting plate 34 is attached to the other end face of the substrate 31, in order to ensure that the limiting slot 341 on the limiting plate 34 is exactly opposite to one end of the elastic member 33, it is necessary to adjust the relative position of the limiting plate 34 and the substrate 31. In order to achieve rapid positioning of the limiting slot 341 and one end of the elastic member 33, and thereby make at least two adjacent first side walls 342 flush with at least two adjacent second side walls 311 in a one-to-one correspondence, one end of the elastic member 33 can be just inserted into the limiting slot 341. Preferably, the three adjacent first side walls 342 are flush with the three adjacent second side walls 311 in a one-to-one correspondence.
[0043] Optionally, a plurality of elastic members 33 are provided, and the plurality of elastic members 33 are spaced apart along the length direction of the substrate 31. In this embodiment, this arrangement can improve the uniformity of force applied to the substrate 31 and avoid deflection or jamming of the substrate 31 due to uneven force.
[0044] Optionally, the limiting plate 34 is glued to the base plate 31. In this embodiment, since the base plate 31 cannot be provided with threaded holes and clamping parts, the limiting plate 34 is glued to the base plate 31 to ensure the flatness of the base plate 31.
[0045] Optionally, the limiting plate 34 is a plastic part with glue coated on one side. In this embodiment, one side of the limiting plate 34 is coated with glue, and then the side of the limiting plate 34 coated with glue is adhered to the substrate 31. If the limiting plate 34 is set as a metal part, after the limiting plate 34 and the substrate 31 are bonded, a thicker metal bonded plate will be formed. The total thickness of the metal bonded plate is thick, which is easy to accumulate heat and may cause uneven heat dissipation of the substrate 31. Compared with the limiting plate 34 being set as a metal part, the limiting plate 34 of this embodiment is a plastic part. This setting will not affect the heat dissipation of the substrate 31, and can also reduce the overall weight of the thermal print head and reduce manufacturing costs. In other embodiments, the limiting plate 34 can also be made of silicone or ceramic fiber material with glue coated on one side.
[0046] Optionally, the back plate 11 is provided with a retaining protrusion 111 corresponding to the elastic member 33, and the other end of the elastic member 33 is sleeved on the retaining protrusion 111. In this embodiment, this arrangement allows the other end of the elastic member 33 to be retained in position by the back plate 11, further improving the operational stability of the elastic member 33. In other embodiments, the back plate 11 is provided with a retaining recess corresponding to the elastic member 33, and the other end of the elastic member 33 is inserted into the retaining recess.
[0047] This embodiment further provides a printer, comprising the thermal print head in the above solution; the printer may be a thermal transfer printer, a thermal sublimation printer, or a direct thermal printer.
[0048] Example 2
[0049] This embodiment is substantially identical to the first embodiment, differing only in the structure of the limiting plate 34. Optionally, the limiting plate 34 is provided with a limiting hole corresponding to the elastic member 33. The axis of the limiting hole is perpendicular to the other end surface of the base plate 31, and one end of the elastic member 33 is inserted into the corresponding limiting hole. In this embodiment, one end of the elastic member 33 is inserted into the limiting hole of the limiting plate 34, thereby restricting the movement of the elastic member 33 along the plane of the other end surface of the base plate 31, thereby limiting the position of the elastic member 33.
[0050] Example 3
[0051] This embodiment is substantially identical to the first embodiment, differing only in the structure of the limiting plate 34. Optionally, the limiting plate 34 comprises a plate body and a limiting protrusion protruding from the plate body, which engages with the corresponding elastic member 33. In this embodiment, the limiting protrusion can limit one end of the elastic member 33 to restrict the relative position of the elastic member 33 and the base plate 31. Specifically, the limiting plate 34 is an integrally formed component.
[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A thermal print head, characterized in that: include: A frame (1) including a back panel (11); A rubber roller (2), the rubber roller (2) being arranged on the frame (1) and spaced apart from the back plate (11); A print head assembly is provided between the back plate (11) and the rubber roller (2), and the print head assembly comprises a substrate (31), a head piece (32), an elastic member (33) and a limiting plate (34). One end face of the substrate (31) is provided with the head piece (32), and an elastic member (33) is provided between the other end face of the substrate (31) and the back plate (11). The elastic member (33) is used to drive the substrate (31) to move so that the head piece (32) has a tendency to approach the rubber roller (2). The limiting plate (34) is attached to the other end face of the substrate (31), and the limiting plate (34) is used to limit the elastic member (33).
2. The thermal print head according to claim 1, wherein: The limiting plate (34) is provided with a limiting hole corresponding to the elastic member (33), the axis of the limiting hole is arranged along the other end surface perpendicular to the base plate (31), and one end of the elastic member (33) is inserted into the corresponding limiting hole.
3. The thermal print head according to claim 1, wherein: A side wall of the limiting plate (34) perpendicular to the other end face of the base plate (31) is recessed with a limiting slot (341) corresponding to the elastic member (33); the limiting slot (341) passes through the limiting plate (34) in a direction perpendicular to the end face of the base plate (31); and one end of the elastic member (33) is inserted into the corresponding limiting slot (341).
4. The thermal print head according to claim 3, wherein: A bending portion (312) is provided on one side of the base plate (31) close to the notch of the limiting slot (341), and the bending portion (312) is bent toward a side close to the limiting plate (34).
5. The thermal print head according to claim 1, wherein: The limiting plate (34) comprises a plate body and a limiting protrusion protruding from the plate body, and the limiting protrusion is plugged into the corresponding elastic member (33).
6. The thermal print head according to claim 1, wherein: The wall surface of the limiting plate (34) perpendicular to the end surface of the base plate (31) is a first side wall (342), and the wall surface of the base plate (31) perpendicular to the end surface of the base plate (31) is a second side wall (311); At least two adjacent first side walls (342) are flush with at least two adjacent second side walls (311) in a one-to-one correspondence.
7. The thermal print head according to claim 1, wherein: A plurality of elastic members (33) are provided, and the plurality of elastic members (33) are spaced apart along the length direction of the substrate (31).
8. The thermal print head according to any one of claims 1 to 6, characterized in that: The limiting plate (34) and the base plate (31) are glued and fixed.
9. The thermal print head according to any one of claims 1 to 6, characterized in that: The limiting plate (34) is a plastic part with one side coated with glue.
10. A printer, characterized in that The thermal print head comprises the thermal print head according to any one of claims 1 to 9.