Thermal printing head pressure device and printer

Abstract

The utility model relates to the technical field of printing, in particular to a thermal printing head pressure device and a printer. The thermal printing head pressure device comprises a supporting rod and at least one pressure mechanism. The supporting rod comprises at least two first locking parts arranged in the extending direction of the supporting rod. The pressure mechanism comprises a force application assembly, a mounting frame and a locking piece, the force application assembly is used for applying acting force to the thermal printing head, the force application assembly is mounted on the mounting frame, and the mounting frame is connected with the supporting rod in a sleeving mode and can slide along the supporting rod so as to adjust the position of the force application assembly relative to the supporting rod in the extending direction of the supporting rod; the locking piece comprises a second locking part, and the second locking part is used for being matched with any first locking part so as to lock the position, relative to the supporting rod, of the mounting frame in the extending direction of the supporting rod. The thermal printing head pressure device can reliably lock the position of the force application assembly relative to the supporting rod in the extending direction of the supporting rod, and the stability of the position where the force application assembly applies acting force to the thermal printing head during normal work is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a thermal printhead pressure device and printer. Background Technology

[0002] The related technology provides a thermal printhead pressure device including a support rod and a force-applying component disposed on the support rod. The support rod extends along the printing width direction of the thermal printhead, and the force-applying component applies force to the thermal printhead, pressing it firmly against the printing medium to improve the printing quality. To accommodate printing media of different widths, the thermal printhead pressure device also requires that the position of the force-applying component relative to the support rod along the extension direction of the support rod be adjustable to change the position where the force-applying component applies force to the thermal printhead. Furthermore, after the position of the force-applying component relative to the support rod along the extension direction of the support rod is adjusted, it needs to be locked. However, in the related technology, the position of the force-applying component relative to the support rod cannot be reliably locked, and the stability of the position where the force-applying component applies force to the thermal printhead cannot be guaranteed. Utility Model Content

[0003] The purpose of this invention is to provide a thermal printhead pressure device and printer, so as to reliably lock the position of the force-applying component installed on the mounting bracket relative to the support rod along the extension direction of the support rod, and ensure the stability of the position of the force-applying component applying force to the thermal printhead during normal operation.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A thermal printhead pressure device includes a support rod and at least one pressure mechanism. The support rod extends along the printing width direction of the thermal printhead. The support rod includes at least two first locking portions arranged along the extension direction of the support rod. The pressure mechanism includes a force-applying component, a mounting bracket, and a locking member. The force-applying component applies force to the thermal printhead and is mounted on the mounting bracket. The mounting bracket is sleeved with the support rod and can slide along the support rod to adjust the position of the force-applying component relative to the support rod along the extension direction of the support rod. The locking member is connected to the mounting bracket and includes a second locking portion. The second locking portion cooperates with any one of the first locking portions to lock the position of the mounting bracket relative to the support rod along the extension direction of the support rod. The first locking portion is either a protrusion or a groove, and the second locking portion is either the protrusion or the groove. When the second locking portion cooperates with any one of the first locking portions, the protrusion engages with the groove.

[0006] As an optional embodiment, the locking member is movably connected to the mounting bracket, and the locking member can move relative to the mounting bracket, so that the locking member has a locked position and an unlocked position relative to the mounting bracket. When the locking member is in the locked position, the second locking part cooperates with any one of the first locking parts. When the locking member is in the unlocked position, the second locking part is separated from each of the first locking parts. The pressure mechanism also includes an operating part fixedly connected to the locking member. The operating part is used for operation by the operator to drive the locking member to move to the locked position or the unlocked position, wherein the moving direction of the locking member forms an angle with the extending direction of the support rod.

[0007] As an optional solution, the locking member is provided with a limiting groove, the limiting groove having a first wall and a second wall that are opposite to and spaced apart along the moving direction of the locking member, the support rod being located between the first wall and the second wall, the second locking part being disposed on the first wall, the second wall being able to be spaced apart from or abut against the support rod, and when the locking member is in the locked position, the second wall is spaced apart from the support rod, and when the second wall abuts against the support rod, the locking member is in the unlocked position.

[0008] As an optional solution, the mounting bracket is provided with a mounting cavity and a first guide hole communicating with the mounting cavity, and the support rod passes through the mounting cavity; the locking member includes a slider, the slider being slidably inserted into the first guide hole, a second locking part being disposed on the slider and located inside the mounting cavity, and an operating part being disposed at one end of the slider along its moving direction and located outside the mounting cavity.

[0009] As an optional solution, the slider is provided with a clearance groove, and the locking member further includes an elastic arm. The first end of the elastic arm is connected to the slider and located in the clearance groove, and the second end of the elastic arm is suspended. When the locking member is in the locked position, the second end of the elastic arm extends out of the clearance groove and is positioned opposite to the inner wall of the mounting cavity along the moving direction of the locking member, so as to prevent the slider from exiting the mounting cavity through the first guide hole. Under the action of external force, the second end of the elastic arm can generate elastic deformation relative to the first end of the elastic arm and retract into the clearance groove, so that the elastic arm can move with the slider and pass through the first guide hole.

[0010] As an optional embodiment, the mounting cavity has a first cavity wall and a second cavity wall, which are opposite to and spaced apart along the moving direction of the locking member; the support rod passes through the mounting cavity between the first cavity wall and the second cavity wall, the first guide hole is provided in the first cavity wall, and the second cavity wall is provided with a second guide hole opposite to the first guide hole; the locking member also includes a guide shaft fixedly connected to the slider, and the guide shaft is slidably inserted into the second guide hole.

[0011] As an optional embodiment, the pressure mechanism further includes a first elastic element connected between the locking member and the mounting bracket, the first elastic element being used to ensure that the locking member always has a tendency to slide toward the locking position.

[0012] As an optional embodiment, the support rod includes a rack along the extension direction of the support rod, the support rod is provided with a mounting groove, the rack is disposed in the mounting groove, a first locking part is formed between two adjacent teeth of the rack, and the second locking part is a tooth-shaped protrusion that can engage with the rack.

[0013] As an optional solution, the mounting bracket is provided with a mounting cavity and a third guide hole communicating with the mounting cavity; the force application component includes a pressing member and a second elastic member both disposed in the mounting cavity, the pressing member is slidably inserted into the third guide hole, and one end of the pressing member extends out of the mounting cavity through the third guide hole, the pressing member is used to apply force to the thermal printhead under the action of the second elastic member.

[0014] A printer includes a frame, a printing device, and a thermal printhead pressure device as described above. The support rod of the thermal printhead pressure device is supported by the frame. The printing device includes a printhead bracket and a thermal printhead. The printhead bracket is movably connected to the frame. The thermal printhead is disposed on the printhead bracket and is used to print on printing media. A force-applying component abuts against the printhead bracket to apply a force to the thermal printhead through the printhead bracket.

[0015] The beneficial effects of this utility model are:

[0016] This invention provides a thermal printhead pressure device, which includes a support rod and at least one pressure mechanism. The support rod extends along the printing width direction of the thermal printhead and includes at least two first locking portions arranged along its extension direction. The pressure mechanism includes a force-applying component, a mounting bracket, and a locking member. The force-applying component applies force to the thermal printhead and is mounted on the mounting bracket. The mounting bracket is sleeved with the support rod and can slide along the support rod to adjust the position of the force-applying component relative to the support rod along its extension direction. The locking member is connected to the mounting bracket and includes a second locking portion. The second locking portion cooperates with any one of the first locking portions to lock the position of the mounting bracket relative to the support rod along its extension direction. The first locking portion is either a protrusion or a groove, and the second locking portion is either a protrusion or a groove. When the second locking portion cooperates with any one of the first locking portions, the protrusion and the groove are inserted into each other.

[0017] The thermal printhead pressure device provided by this utility model allows for adjustment of the force applied to the thermal printhead by separating the second locking part from each of the first locking parts. This releases the position lock on the mounting bracket, allowing the force applying component to slide along the support rod with the mounting bracket. This adjusts the position of the force applying component relative to the support rod along its extension direction, changing the position of the force applying component on the thermal printhead. After the position of the force applying component relative to the support rod along its extension direction is adjusted, the second locking part engages with the corresponding first locking part, i.e., the protrusion and groove interlock, reliably locking the position of the mounting bracket relative to the support rod along its extension direction. This, in turn, reliably locks the position of the force applying component mounted on the mounting bracket relative to the support rod along its extension direction, ensuring the stability of the position of the force applying the component to the thermal printhead during normal operation.

[0018] This utility model also provides a printer, which includes a frame, a printing device, and the aforementioned thermal printhead pressure device. The support rod of the thermal printhead pressure device is supported by the frame. The printing device includes a printhead bracket and a thermal printhead. The printhead bracket is movably connected to the frame, and the thermal printhead is disposed on the printhead bracket for printing on printing media. A force-applying component abuts against the printhead bracket to apply force to the thermal printhead through the printhead bracket. The printer provided by this utility model, by applying the aforementioned thermal printhead pressure device, can reliably lock the position of the force-applying component mounted on the mounting frame relative to the support rod along the extension direction of the support rod, ensuring the stability of the position where the force-applying component applies force to the thermal printhead during normal operation. Attached Figure Description

[0019] Figure 1 This is a first structural schematic diagram of the thermal printhead pressure device provided in this embodiment of the utility model;

[0020] Figure 2 This is a second structural schematic diagram of the thermal printhead pressure device provided in this embodiment of the utility model;

[0021] Figure 3 This is a structural cross-sectional view of the thermal printhead pressure device provided in this embodiment of the utility model;

[0022] Figure 4 This is a first structural schematic diagram of the locking component of the thermal printhead pressure device provided in this embodiment of the utility model;

[0023] Figure 5 This is a partial exploded view of the thermal printhead pressure device provided in an embodiment of the present invention;

[0024] Figure 6 This is a second structural schematic diagram of the locking component of the thermal printhead pressure device provided in this embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of the printer provided in an embodiment of the present invention.

[0026] In the picture:

[0027] 10-Thermal printhead pressure device; 20-Frame; 30-Printing device; 301-Printhead support; 302-Printing roller; 303-Thermal printhead; 40-Rotating shaft;

[0028] 1-Support rod; 11-Groove; 12-Abutting surface; 13-Rack; 14-Mounting slot; 15-Scale line;

[0029] 2-Pressure mechanism; 21-Force application component; 211-Pressing element; 212-Second elastic element; 213-Mounting plate; 214-Screw; 215-Adjusting nut; 216-Limiting part; 22-Mounting bracket; 221-Mounting cavity; 205-First cavity wall; 206-Second cavity wall; 222-First guide hole; 223-Second guide hole; 224-Third guide hole; 225-Opening; 23-Locking element; 231-Slider; 201-Allowing groove; 232-Elastic arm; 233-Guide shaft; 234-Protrusion; 235-Limiting groove; 202-First wall; 203-Second wall; 204-Third wall; 24-Operating part; 25-First elastic element. Detailed Implementation

[0030] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Figure 1 This is a first structural schematic diagram of the thermal printhead pressure device 10 provided in this embodiment of the present invention. Figure 2 This is a second structural schematic diagram of the thermal printhead pressure device 10 provided in this embodiment of the present invention. Figure 3 This is a structural cross-sectional view of the thermal printhead pressure device 10 provided in this embodiment of the utility model. Figure 4 This is a first structural schematic diagram of the locking member 23 of the thermal printhead pressure device 10 provided in this embodiment of the utility model. Figure 5 This is a partial exploded view of the thermal printhead pressure device 10 provided in this embodiment of the present invention. Figure 6 This is a second structural schematic diagram of the locking member 23 of the thermal printhead pressure device 10 provided in this embodiment of the utility model. Figures 1-6As shown, this embodiment provides a thermal printhead pressure device 10, which includes a support rod 1 and at least one pressure mechanism 2. The support rod 1 extends along the printing width direction of the thermal printhead 303, and includes at least two first locking parts arranged along the extension direction of the support rod 1. The pressure mechanism 2 includes a force-applying component 21, a mounting bracket 22, and a locking member 23. The force-applying component 21 is used to apply force to the thermal printhead 303, and is mounted on the mounting bracket 22. The mounting bracket 22 is sleeved with the support rod 1 and can extend along the support rod 303. The rod 1 slides to adjust the position of the force-applying component 21 relative to the support rod 1 along the extension direction of the support rod 1; the locking member 23 is connected to the mounting bracket 22, and the locking member 23 includes a second locking part, which is used to cooperate with any one of the first locking parts to lock the position of the mounting bracket 22 relative to the support rod 1 along the extension direction of the support rod 1. The first locking part is one of the protrusion 234 and the groove 11, and the second locking part is the other of the protrusion 234 and the groove 11. When the second locking part cooperates with any one of the first locking parts, the protrusion 234 is inserted into the groove 11.

[0035] The thermal printhead pressure device 10 provided in this embodiment, when it is necessary to adjust the position of the force applied by the force-applying component 21 to the thermal printhead 303, separates the second locking part from each of the first locking parts, thereby releasing the position lock of the mounting bracket 22. This allows the force-applying component 21 to slide along the support rod 1 with the mounting bracket 22, thereby adjusting the position of the force-applying component 21 relative to the support rod 1 along the extension direction of the support rod 1. This changes the position of the force-applying component 21 applying force to the thermal printhead 303. After the position of the force-applying component 21 relative to the support rod 1 along the extension direction of the support rod 1 is adjusted, the second locking part cooperates with the corresponding first locking part, that is, the protrusion 234 and the groove 11 are inserted into each other, thereby reliably locking the position of the mounting bracket 22 relative to the support rod 1 along the extension direction of the support rod 1. This reliably locks the position of the force-applying component 21 installed on the mounting bracket 22 relative to the support rod 1 along the extension direction of the support rod 1, ensuring the stability of the position of the force-applying component 21 applying force to the thermal printhead 303 during normal operation.

[0036] Preferably, such as Figure 1 and Figure 2 As shown, the thermal printhead pressure device 10 includes two pressure mechanisms 2, which are spaced apart along the extension direction of the support rod 1. Preferably, the support rod 1 has multiple scale lines 15 spaced apart, and the mounting bracket 22 can be aligned with any scale line 15 to ensure the accuracy of the position adjustment of the force-applying component 21. In this embodiment, there are multiple first locking parts and one second locking part. In other embodiments, there are multiple first locking parts and two or more second locking parts, and the number of first locking parts is greater than the number of second locking parts.

[0037] Optionally, such as Figures 2-4 As shown, the support rod 1 includes a rack 13 extending along its extension direction. The support rod 1 has a mounting groove 14, and the rack 13 is disposed within the mounting groove 14. A first locking portion is formed between two adjacent teeth of the rack 13, such that the first locking portion is a groove 11, and the second locking portion is a toothed protrusion 234 capable of engaging with the rack 13. This configuration enables stepless adjustment of the position of the force-applying component 21 along the extension direction of the support rod 1, improving the adaptability of the thermal printhead pressure device 10 to the width specifications of the printing media. The rack 13, disposed within the mounting groove 14, reduces the space occupied and improves the overall strength of the connection between the protrusion 234 and the groove 11, thereby enhancing the locking reliability of the force-applying component 21. In other embodiments, the support rod 1 has a mounting plane, and the rack 13 protrudes from the mounting plane. In other embodiments, the support rod 1 includes multiple first locking portions, which are arranged sequentially at intervals along the extension direction of the support rod 1. Preferably, the support rod 1 has a square cross-section, the mounting groove 14 is provided on one side of the support rod 1, and the mounting frame 22 is provided with a support hole extending along the extension direction of the support rod 1. The support hole is sleeved with the support rod 1, and the cross-sectional shape of the support hole is adapted to the cross-sectional shape of the support rod 1, so that the mounting frame 22 can only move relative to the support rod 1 along the extension direction of the support rod 1, thereby improving the reliability of the force application component 21 applying force to the thermal print head 303.

[0038] In this embodiment, as Figures 1-4As shown, the locking member 23 is movably connected to the mounting bracket 22, allowing the locking member 23 to move relative to the mounting bracket 22, thus having a locked position and an unlocked position relative to the mounting bracket 22. When the locking member 23 is in the locked position, the second locking part engages with any one of the first locking parts; when the locking member 23 is in the unlocked position, the second locking part separates from each of the first locking parts. The pressure mechanism 2 also includes an operating part 24 fixedly connected to the locking member 23. The operating part 24 is used by the operator to drive the locking member 23 to move to the locked or unlocked position, wherein the direction of movement of the locking member 23 forms an angle with the extension direction of the support rod 1. In this embodiment, the locking member 23 can be driven to move to the locked or unlocked position by the operator applying force to the operating part 24, which is simple to operate and improves the efficiency of adjusting the position of the force application component 21. Preferably, the direction of movement of the locking member 23 is perpendicular to the extension direction of the support rod 1. In other embodiments, the locking member 23 is pivotally connected to the mounting bracket 22 via a pivot shaft and can rotate relative to the mounting bracket 22 about the pivot axis to a locked position or an unlocked position. In other embodiments, the locking member 23 is made of an elastic material, with a first end connected to the mounting bracket 22 and a second end suspended. A second locking part is disposed at the second end of the locking member 23. Under no external force, the second locking part cooperates with any one of the first locking parts. When an external force is applied to the second end of the locking member 23, the second locking part can be separated from each of the first locking parts.

[0039] In this embodiment, as Figure 3 and Figure 4 As shown, the locking member 23 is provided with a limiting groove 235. The limiting groove 235 has a first wall 202 and a second wall 203 that are opposite to and spaced apart along the moving direction of the locking member 23. The support rod 1 is located between the first wall 202 and the second wall 203. The second locking part is provided on the first wall 202. The second wall 203 can be spaced apart from or abut against the support rod 1. When the locking member 23 is in the locked position, the second wall 203 is spaced apart from the support rod 1. When the second wall 203 abuts against the support rod 1, the locking member 23 is in the unlocked position. The above arrangement allows the locking member 23 to abut against the support rod 1 through the second wall 203 after leaving the locked position, limiting the maximum travel of the locking member 23 after leaving the locked position and improving the reliability of the locking member 23's movement between the locked and unlocked positions. Preferably, the support rod 1 is provided with an abutting surface 12 for abutting against the second wall 203. Preferably, the limiting groove 235 further includes a third wall 204 connected between the first wall 202 and the second wall 203. The third wall 204 is disposed opposite to the support rod 1, and the support rod 1 is located between the first wall 202, the second wall 203, and the third wall 204. This arrangement further improves the positional stability of the locking member 23 relative to the support rod 1.

[0040] Optionally, such as Figure 3 and Figure 5 As shown, the mounting bracket 22 is provided with a mounting cavity 221 and a first guide hole 222 communicating with the mounting cavity 221. The support rod 1 passes through the mounting cavity 221. The locking member 23 includes a slider 231, which is slidably inserted into the first guide hole 222. A second locking part is provided on the slider 231 and located inside the mounting cavity 221. An operating part 24 is provided at one end of the slider 231 along its moving direction and is located outside the mounting cavity 221. The above configuration improves the support stability of the support rod 1 on the mounting bracket 22 and the moving stability of the locking member 23 relative to the mounting bracket 22. In addition, the operating part 24 is located outside the mounting cavity 221, making it easier to operate. Preferably, the operating part 24 is formed on the end face of the slider 231 along its moving direction. Pressing the operating part 24 along the moving direction of the slider 231 can drive the locking member 23 to move to the unlocked position. In other embodiments, the operating part 24 is a handle provided at one end of the slider 231 along its moving direction, and pulling the handle along the moving direction of the slider 231 can drive the locking member 23 to move to the unlocked position.

[0041] In this embodiment, as Figure 3 and Figure 6 As shown, the slider 231 is provided with a relief groove 201, and the locking member 23 also includes an elastic arm 232. The first end of the elastic arm 232 is connected to the slider 231 and located in the relief groove 201, and the second end of the elastic arm 232 is suspended. When the locking member 23 is in the locked position, the second end of the elastic arm 232 extends out of the relief groove 201 and is positioned opposite to the inner wall of the mounting cavity 221 along the moving direction of the locking member 23, so as to prevent the slider 231 from exiting the mounting cavity 221 through the first guide hole 222. Under the action of external force, the second end of the elastic arm 232 can generate elastic deformation relative to the first end of the elastic arm 232 and retract into the relief groove 201, so that the elastic arm 232 can move with the slider 231 and pass through the first guide hole 222. The above configuration allows the slider 231 to slide along the first guide hole 222 when the locking member 23 is installed on the mounting bracket 22. Under the action of the hole wall of the first guide hole 222, the second end of the elastic arm 232 undergoes elastic deformation relative to the first end of the elastic arm 232 and enters the relief groove 201. This allows the elastic arm 232 to slide with the slider 231 and pass through the first guide hole 222 into the mounting cavity 221. After the elastic arm 232 enters the mounting cavity 221, the second end of the elastic arm 232 resets and extends out of the relief groove 201. The second end of the elastic arm 232 is opposite to the inner wall of the mounting cavity 221, preventing the slider 231 from exiting the mounting cavity 221 through the first guide hole 222. Thus, the installation of the locking member 23 can be completed through the first guide hole 222, improving the ease of operation of the installation of the locking member 23.

[0042] In this embodiment, as Figure 3 and Figure 5As shown, the mounting cavity 221 has a first cavity wall 205 and a second cavity wall 206. Along the moving direction of the locking member 23, the first cavity wall 205 and the second cavity wall 206 are opposite to each other and spaced apart. The support rod 1 passes through the mounting cavity 221 between the first cavity wall 205 and the second cavity wall 206. A first guide hole 222 is provided in the first cavity wall 205, and a second guide hole 223 opposite to the first guide hole 222 is provided in the second cavity wall 206. The locking member 23 also includes a guide shaft 233 fixedly connected to the slider 231, and the guide shaft 233 is slidably inserted into the second guide hole 223. This arrangement allows the locking member 23 to be supported by both sides of the support rod 1 through the first guide hole 222 and the second guide hole 223, improving the support stability of the mounting frame 22 on the locking member 23, ensuring the reliability of the insertion and engagement of the protrusion 234 and the groove 11, and further improving the locking reliability of the force-applying component 21.

[0043] In this embodiment, as Figure 3 As shown, the pressure mechanism 2 also includes a first elastic element 25, which is connected between the locking element 23 and the mounting bracket 22. The first elastic element 25 is used to ensure that the locking element 23 always has a tendency to slide towards the locked position. By setting the first elastic element 25, when no external force is applied, the locking element 23 can be located in the locked position under the elastic force of the first elastic element 25. When an external force is applied to the locking element 23, the locking element 23 can overcome the elastic force of the first elastic element 25 and move to the unlocked position to adjust the position of the force-applying component 21 relative to the support rod 1. When the external force applied to the locking element 23 is removed, the first elastic element 25 causes the locking element 23 to automatically move to the locked position to lock the position of the force-applying component 21 relative to the support rod 1 along the extension direction of the support rod 1. The operation is simple and helps to improve the adjustment efficiency of the force-applying component 21. Preferably, the first elastic element 25 is a compression spring or a tension spring. The first elastic element 25 is sleeved on the guide shaft 233 and abuts against the second cavity wall 206 and the slider 231, thereby improving the installation stability of the first elastic element 25.

[0044] like Figure 3 and Figure 5As shown, the mounting bracket 22 is provided with a third guide hole 224 communicating with the mounting cavity 221. The force application component 21 includes a pressing member 211 and a second elastic member 212 both disposed in the mounting cavity 221. The pressing member 211 is slidably inserted into the third guide hole 224, and one end of the pressing member 211 extends out of the mounting cavity 221 through the third guide hole 224. The pressing member 211 is used to apply force to the thermal print head 303 under the action of the second elastic member 212. Optionally, the mounting bracket 22 is further provided with an opening 225 communicating with the mounting cavity 221. The force application component 21 also includes a mounting plate 213, a screw 214, and an adjusting nut 215, all disposed within the mounting cavity 221. The first end of the screw 214 is fixedly connected to the mounting plate 213. The adjusting nut 215 is threadedly connected to the screw 214 and protrudes through the opening 225. The pressing member 211 is slidably sleeved with the second end of the screw 214. The force application component 21 also includes a limiting part 216 fixedly connected to the pressing member 211. The limiting part 216 is opposite to the inner wall of the mounting cavity 221. A second elastic member 212 is connected between the adjusting nut 215 and the limiting part 216. The second elastic member 212 is used to ensure that the mounting plate 213 always has a tendency to abut against the support rod 1. The second elastic member 212 is also used to ensure that the limiting part 216 always has a tendency to abut against the inner wall of the mounting cavity 221. The axial direction of the screw 214 is perpendicular to the extension direction of the support rod 1. Rotating the adjusting nut 215 causes it to move along the screw 214, which changes the elastic deformation of the second elastic element 212. This allows adjustment of the force exerted by the second elastic element 212 on the pressing element 211, and consequently, the force exerted by the pressing element 211 on the thermal printhead 303. Optionally, in this embodiment, the second elastic element 212 is a compression spring or a tension spring. The second elastic element 212 is sleeved on the screw 214 and the pressing element 211, thereby improving the installation stability of the second elastic element 212.

[0045] Figure 7 This is a schematic diagram of the printer provided in an embodiment of this utility model. Figure 7As shown, the printer provided in this embodiment includes a frame 20, a printing device 30, and the aforementioned thermal printhead pressure device 10. The support rod 1 of the thermal printhead pressure device 10 is supported by the frame 20. The printing device 30 includes a printhead bracket 301 and a thermal printhead 303. The printhead bracket 301 is movably connected to the frame 20. The thermal printhead 303 is disposed on the printhead bracket 301 and is used to print on the printing medium. The force-applying component 21 abuts against the printhead bracket 301 to apply force to the thermal printhead 303 through the printhead bracket 301. The printer provided in this embodiment, by applying the aforementioned thermal printhead pressure device 10, can reliably lock the position of the force-applying component 21 mounted on the mounting frame 22 relative to the support rod 1 along the extension direction of the support rod 1, ensuring the stability of the position of the force-applying component 21 applying force to the thermal printhead 303 during normal operation.

[0046] Preferably, such as Figure 7 As shown, the printhead support 301 is pivotally connected to the frame 20 via a pivot 40, and the position where the force-applying component 21 applies force to the thermal printhead 303 is spaced apart from the axis of the pivot 40. The printing device 30 also includes a printing roller 302, which is supported by the frame 20 and can rotate around its own axis. The printing roller 302 is used to cooperate with the thermal printhead 303. During printing, the printing medium passes between the printing roller and the thermal printhead 303. The thermal printhead 303 and the printing roller 302 are located on the first side of the printhead support 301, and the force-applying component 21 is located on the second side of the printhead support 301. The force applied by the force-applying component 21 to the printhead support 301 is used to ensure that the printhead support 301 always has a rotational tendency to drive the thermal printhead 303 closer to the printing roller 302. When the adjusting nut 215 is rotated and moved along the screw 214, the amount of elastic deformation of the second elastic element 212 can be changed to change the magnitude of the force applied by the second elastic element 212 to the pressing element 211. The force of the pressing element 211 on the thermal print head 303 changes synchronously through the print head bracket 301, so as to adjust the magnitude of the force of the thermal print head 303 pressing the printing medium onto the printing roller 302, thereby improving the printing quality of the thermal print head 303 on the printing medium.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A thermal printhead pressure device, characterized in that, The device includes a support rod (1) and at least one pressure mechanism (2). The support rod (1) extends along the printing width direction of the thermal printhead (303). The support rod (1) includes at least two first locking parts arranged along the extension direction of the support rod (1). The pressure mechanism (2) includes a force-applying component (21), a mounting bracket (22), and a locking element (23). The force-applying component (21) is used to apply force to the thermal printhead (303). The force-applying component (21) is mounted on the mounting bracket (22). The mounting bracket (22) is sleeved with the support rod (1) and can slide along the support rod (1) to adjust the force-applying component (21) relative to the support rod (1). The position of the rod (1) along the extension direction of the support rod (1); the locking member (23) is connected to the mounting bracket (22), the locking member (23) includes a second locking part, the second locking part is used to cooperate with any one of the first locking parts to lock the position of the mounting bracket (22) relative to the support rod (1) along the extension direction of the support rod (1), wherein the first locking part is one of a protrusion (234) and a groove (11), and the second locking part is the other of the protrusion (234) and the groove (11). When the second locking part cooperates with any one of the first locking parts, the protrusion (234) is inserted into the groove (11).

2. The thermal printhead pressure device according to claim 1, characterized in that, The locking member (23) is movably connected to the mounting bracket (22). The locking member (23) can move relative to the mounting bracket (22) so that the locking member (23) has a locked position and an unlocked position relative to the mounting bracket (22). When the locking member (23) is in the locked position, the second locking part cooperates with any one of the first locking parts. When the locking member (23) is in the unlocked position, the second locking part is separated from each of the first locking parts. The pressure mechanism (2) also includes an operating part (24) fixedly connected to the locking member (23). The operating part (24) is used for operation by the operator to drive the locking member (23) to move to the locked position or the unlocked position. The moving direction of the locking member (23) is at an angle to the extending direction of the support rod (1).

3. The thermal printhead pressure device according to claim 2, characterized in that, The locking member (23) is provided with a limiting groove (235). The limiting groove (235) has a first wall (202) and a second wall (203) that are opposite to and spaced apart along the moving direction of the locking member (23). The support rod (1) is located between the first wall (202) and the second wall (203). The second locking part is disposed on the first wall (202). The second wall (203) can be spaced apart from or abut against the support rod (1). When the locking member (23) is in the locked position, the second wall (203) is spaced apart from the support rod (1). When the second wall (203) abuts against the support rod (1), the locking member (23) is in the unlocked position.

4. The thermal printhead pressure device according to claim 2, characterized in that, The mounting bracket (22) is provided with a mounting cavity (221) and a first guide hole (222) communicating with the mounting cavity (221). The support rod (1) passes through the mounting cavity (221). The locking member (23) includes a slider (231), which is slidably inserted into the first guide hole (222). The second locking part is disposed on the slider (231) and located inside the mounting cavity (221). The operating part (24) is disposed at one end of the slider (231) along its moving direction and is located outside the mounting cavity (221).

5. The thermal printhead pressure device according to claim 4, characterized in that, The slider (231) is provided with a clearance groove (201), and the locking member (23) further includes an elastic arm (232). The first end of the elastic arm (232) is connected to the slider (231) and located in the clearance groove (201). The second end of the elastic arm (232) is suspended. When the locking member (23) is in the locked position, the second end of the elastic arm (232) extends out of the clearance groove (201) and is positioned opposite to the inner wall of the mounting cavity (221) along the moving direction of the locking member (23) to prevent the slider (231) from exiting the mounting cavity (221) through the first guide hole (222). Under the action of external force, the second end of the elastic arm (232) can generate elastic deformation relative to the first end of the elastic arm (232) and retract into the clearance groove (201), so that the elastic arm (232) can move with the slider (231) and pass through the first guide hole (222).

6. The thermal printhead pressure device according to claim 4, characterized in that, The mounting cavity (221) has a first cavity wall (205) and a second cavity wall (206). Along the moving direction of the locking member (23), the first cavity wall (205) and the second cavity wall (206) are opposite to each other and spaced apart. The support rod (1) passes through the mounting cavity (221) between the first cavity wall (205) and the second cavity wall (206). The first guide hole (222) is provided in the first cavity wall (205), and the second cavity wall (206) is provided with a second guide hole (223) opposite to the first guide hole (222). The locking member (23) also includes a guide shaft (233) fixedly connected to the slider (231). The guide shaft (233) is slidably inserted into the second guide hole (223).

7. The thermal printhead pressure device according to any one of claims 2 to 6, characterized in that, The pressure mechanism (2) further includes a first elastic element (25) connected between the locking member (23) and the mounting bracket (22), the first elastic element (25) being used to make the locking member (23) always have a tendency to slide toward the locking position.

8. The thermal printhead pressure device according to claim 1, characterized in that, The support rod (1) includes a rack (13) extending along the extension direction of the support rod (1). The support rod (1) is provided with a mounting groove (14). The rack (13) is disposed in the mounting groove (14). A first locking part is formed between two adjacent teeth of the rack (13). The second locking part is a toothed protrusion (234) that can engage with the rack (13).

9. The thermal printhead pressure device according to claim 1, characterized in that, The mounting bracket (22) is provided with a mounting cavity (221) and a third guide hole (224) communicating with the mounting cavity (221); the force application component (21) includes a pressing member (211) and a second elastic member (212) both disposed in the mounting cavity (221), the pressing member (211) is slidably inserted into the third guide hole (224), and one end of the pressing member (211) extends out of the mounting cavity (221) through the third guide hole (224), and the pressing member (211) is used to apply force to the thermal printhead (303) under the action of the second elastic member (212).

10. A printer, characterized in that, The device includes a frame (20), a printing device (30), and a thermal printhead pressure device as described in any one of claims 1 to 9. The support rod (1) of the thermal printhead pressure device is supported by the frame (20). The printing device (30) includes a printhead support (301) and a thermal printhead (303). The printhead support (301) is movably connected to the frame (20). The thermal printhead (303) is disposed on the printhead support (301) and is used to print on printing media. The force-applying component (21) abuts against the printhead support (301) to apply force to the thermal printhead (303) through the printhead support (301).

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