A printhead position control mechanism and thermal printer

Abstract

The application provides a printing head position control mechanism, and relates to the technical field of printing devices.The printing head position control mechanism comprises an adjusting seat and a printing head assembly, one end of the printing head assembly is provided with a printing head, the other end is rotatably connected to the adjusting seat, and the printing head position control mechanism further comprises a control structure for enabling the printing head to be in a closed state or an open state, a control member for controlling the switching of the printing head between the two states, and the control member is rotatably connected to the adjusting seat.The printing head assembly is connected to the adjusting seat through pivoting, the control member is rotatably connected to the adjusting seat, and the control structure and the control member are arranged, so that the printing head can be rotated to avoid the printing head in the printer, and the user can replace the printing consumables conveniently.Meanwhile, under the action of the control member, the printing head in the closed state and the printing rubber roller are in non-rigid contact during the printing process, the control member and the printing assembly are abutted, and the contact pressure between the printing head and the printing rubber roller is adjusted.The application further provides a thermal printer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing devices, in particular to a printing head position control mechanism and a thermal printer. BACKGROUND

[0002] When the thermal printer is working, the ribbon and the printing paper pass through between the printing head and the rubber roller in a stacked manner under the driving of the ribbon winding wheel and the rubber roller, and then the printing head heats the ribbon and prints the toner on the ribbon on the printing paper. When the ribbon is exhausted, it needs to be replaced in the printer. The poor structure setting will cause inconvenience to the user and will cause the position deviation of the ribbon and the printing paper after replacement, thereby affecting the imaging quality.

[0003] The components in the printing head mechanism of the prior art thermal printer are in a rigid structure, that is, when the printing head assembly is pressed against the rubber roller after the new machine is assembled, the printing head assembly and the rubber roller are in rigid contact, and the contact pressure is a fixed value and cannot be adjusted. When the installation precision between the printing head mechanism and the rubber roller is large, the following problems are prone to occur: the contact pressure between the printing head and the rubber roller is too large or too small. Too large will result in slow movement of the ribbon and the printing paper, affecting the printing quality, and too small will result in unclear printing, affecting the printing effect.

[0004] For example, the Chinese patent CN206718740U discloses a "modular printing head of thermal printer and thermal printer", which comprises a printer main body and a printing head. The printing head is a modular printing head. The printer main body is provided with a groove for installing the printing head. The groove is provided with a sliding block on both sides of the length direction of the groove, which is matched with the clamping part of the modular printing head. The sliding block is provided with a buckle, so that the sliding block can be buckled on the clamping part, so that the modular printing head is fixed in the groove. By adopting the sliding clamping mode, the replacement and maintenance of the modular printing head can be facilitated. The modular printing head is fixed in the printer in a sliding buckling mode. The sliding block and the groove are in sliding fit, and the position of the printing head can be adjusted only in the sliding buckling direction. However, the position of the printing head cannot be controlled in the printing direction, and the printing head cannot be avoided from rotating in the printer. SUMMARY

[0005] The present application discloses a printing head position control mechanism and a thermal printer, which aims to improve the problem that the setting of the existing printing head assembly affects the replacement of the ribbon.

[0006] The present application adopts the following scheme:

[0007] A printing head position control mechanism, comprising an adjusting base and a printing head assembly, one end of the printing head assembly is provided with a printing head, the other end is rotatably pivoted to the adjusting base, further comprising a control structure for making the printing head in a closed state or an open state, and a control member for controlling the printing head to switch between the two states, the control member is rotatably pivoted to the adjusting base.

[0008] As a further improvement, the control structure comprises a control shaft provided on the printing head assembly and a control cavity provided on the control member and matched with the control shaft, the printing head assembly rotates relative to the adjusting base and switches between the two states under the limit of the control cavity.

[0009] As a further improvement, the adjusting base is provided with a mounting cavity, the pivoting part of the printing head assembly to the adjusting base and the pivoting part of the control member to the adjusting base are all located in the mounting cavity.

[0010] As a further improvement, the printing head assembly is provided with a clearance part, the control member is rotatably pivoted to the adjusting base through the clearance part, and the control shaft is provided in the clearance part.

[0011] As a further improvement, the control cavity comprises a first control area for making the printing head in a closed state and a second control area for making the printing head in an open state, the rotation of the control member is to make the control shaft move between the first control area and the second control area.

[0012] The application further provides a thermal printer, comprising a base, a driving mechanism and the above-mentioned printing head position control mechanism, the driving mechanism pushes the adjusting base to move up and down to further change the printing distance between the printing head in a closed state and the printing paper.

[0013] As a further improvement, the driving mechanism comprises a motor and a cam, the cam pushes the adjusting base to move up and down.

[0014] As a further improvement, a control lever mechanism is further included, the control lever mechanism comprises a control lever and a swing lever, one end of the swing lever is controlled by the control lever, the other end is matched with the control member via a transmission member to drive the control member to rotate, and the middle part is rotatably pivoted to the base.

[0015] As a further improvement, the transmission member comprises a pressing swing lever and a reset spring, the middle part of the pressing swing lever is hinged to the base, one end is movably connected to the control member to drive the control member to rotate, the other end is pressed to the swing lever to make the swing lever abut against the printing head assembly, and the reset spring is provided on the base and the end of the pressing swing lever close to the control member to provide elastic pressing force for the other end.

[0016] As a further improvement, the adjusting seat is provided with a guide sliding structure cooperating with the base when moving relative to the base, the guide sliding structure comprises a guide column arranged on the printer and arranged along the lifting direction of the printhead assembly, a bushing arranged on the adjusting seat and slidingly sleeved on the guide column, and a buffer member sleeved on the guide column to provide a downward thrust force for the bushing.

[0017] By adopting the above technical scheme, the following technical effects can be achieved:

[0018] The printhead position control mechanism of the present application controls the rotation of the control member on the adjusting seat through the pivotal connection between the printhead assembly and the adjusting seat, and is provided with a control structure for enabling the printhead of the printhead assembly to be in a closed state or an open state, and a control member for controlling the switching of the printhead between the closed state and the open state, so as to realize the avoidance rotation of the printhead in the printer, and facilitate the user to replace the print consumables such as the ink ribbon. At the same time, under the action of the control member, the printhead in the closed state and the printing rubber roller are in non-rigid contact during the printing process, and the contact pressure between the printhead and the printing rubber roller is adjusted through the abutting connection between the control member and the printing assembly.

[0019] Further, the control structure includes a control shaft arranged on the printhead assembly, and a control cavity opened on the control member, and the printhead assembly rotates on the adjusting seat under the limiting of the control cavity to switch to the closed state or the open state. The control cavity includes a first control area and a second control area, and the control member rotates to move the control shaft between the first control area and the second control area in the control cavity, corresponding to the control of the printhead in the closed state or the open state.

[0020] Further, when in the closed state, the control shaft abuts and is limited on the first control area at the end point of the control cavity, at this time the control member is stably placed between the printhead assembly and the adjusting seat without external force, to relatively limit and fix the printhead assembly. And the printhead assembly is elastically abutted and placed in the first control area by the control shaft, to realize the relative elastic limiting and fixing of the printhead assembly on the adjusting seat, so as to realize the elastic contact between the printhead and the printing rubber roller, and avoid the rigid contact in the printing direction.

[0021] The thermal printer provided by the present application further includes a driving mechanism, a base and the above-mentioned printhead position control mechanism, the driving mechanism is provided with a motor and a cam, so that the cam pushes the adjusting seat to move up and down, further changes the printing distance between the printhead in the closed state and the printing paper, facilitates the upward movement to avoid the conveying of the printing paper, and the downward movement to press the printing paper for printing.

[0022] Further, a control lever mechanism is arranged, which comprises a control lever and a swing lever, the swing lever is pivotally connected to the base and one end of the swing lever is connected to the control lever and the other end of the swing lever is connected to the control member to drive the control member to rotate. The swing lever is rotated to drive the control member to rotate, so as to move the control cavity on the control member and the control shaft on the print head assembly. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1 is a structural schematic view of the print head position control mechanism of the embodiment 1 of the present application in a first perspective view;

[0025] Figure 2 is a partial exploded view of Figure 1 ;

[0026] Figure 3 is a partial exploded view of the print head position control mechanism of the embodiment 1 of the present application in a second perspective view;

[0027] Figure 4 is a sectional view of the print head position control mechanism of the embodiment 1 of the present application when the print head is in a closed state;

[0028] Figure 5 is a sectional view of the print head position control mechanism of the embodiment 1 of the present application when the print head is in an open state;

[0029] Figure 6 is a structural schematic view of the thermal printer of the embodiment 2 of the present application;

[0030] Figure 7 is a sectional view in another perspective view; Figure 6

[0031] Figure 8 is a structural schematic view of the thermal printer of the embodiment 2 of the present application in a first perspective view;

[0032] Figure 9 is a structural schematic view of the thermal printer of the embodiment 2 of the present application in a second perspective view;

[0033] Figure 10 is a partial enlarged view of the I area; Figure 9

[0034] Figure 11 ​​This is a schematic diagram of the thermal printer of Embodiment 2 of the present invention from a third-person perspective, with the printhead assembly in a closed state;

[0035] Figure 12 yes Figure 9 A schematic diagram of the structure of the control lever;

[0036] Figure 13 yes Figure 9 A schematic diagram of the printhead assembly of a medium thermal printer in the open state;

[0037] Figure 14 yes Figure 13 A structural diagram from another perspective.

[0038] Icons: 1-Adjusting seat; 11-Mounting cavity; 12-Guide column; 13-Bushing; 14-Buffer; 2-Print head assembly; 21-Print head; 22-Leaving part; 3-Control structure; 31-Control shaft; 32-Control cavity; 321-First control area; 322-Second control area; 4-Control component; 41-Leaving groove; 5-Elastic component; 6-Base; 61-Identification disc; 7-Drive mechanism; 71-Motor; 72-Cam; 73-Linkage shaft; 74-Manual adjustment knob; 8-Control lever mechanism; 81-Control lever; 811-Grip part; 812-Connecting rod; 82-Swing rod; 9-Transmission component; 91-Pressing swing rod; 92-Reset spring; S1-First pivot part; S2-Second pivot part. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] Example 1

[0045] In combination Figures 1 to 4The embodiment provides a printing head position control mechanism, which comprises an adjusting seat 1 and a printing head assembly 2. The printing head assembly 2 is provided with a printing head 21 at one end and rotatably pivoted to the adjusting seat 1 at the other end. In the embodiment, the adjusting seat 1 is provided with a mounting cavity 11 matched with the printing head assembly 2. The printing head assembly 2 is assembled into the mounting cavity 11 of the adjusting seat 1 through a first pivot S1, and rotates along the pivoted end to be in a closed state horizontally arranged on the mounting cavity 11 or an open state obliquely arranged on the mounting cavity 11.

[0046] When in the open state, the printing head 21 is relatively far away from a printing rubber roller (not shown in the figure) in the printing direction. When in the closed state, the printing head 21 is relatively close to the printing rubber roller, so as to further press on the printing rubber roller in the printing process.

[0047] Please refer to Figures 2 to 5 The printing head position control mechanism also comprises a control structure 3 for enabling the printing head 21 to be in the closed state or the open state and a control piece 4 for controlling the printing head 21 to switch between the two states. The control piece 4 is rotatably pivoted to the adjusting seat 1, and in the embodiment, is hinged to the adjusting seat 1 through a second pivot S2 to rotate relative to the pivoted end and adjust the switching of the printing head assembly 2 between the two states. By controlling the printing head 21 to switch between the open state and the closed state, the printing head 21 is enabled to rotate to avoid in the printer, and it is convenient for the user to replace the printing consumables. Meanwhile, under the action of the control piece 4, the printing head 21 in the closed state is in non-rigid contact with the printing rubber roller in the printing process, and the contact pressure between the printing head 21 and the printing rubber roller is adjusted through the abutting cooperation between the control piece 4 and the printing assembly.

[0048] The control structure 3 comprises a control shaft 31 arranged on the printing head assembly 2 and a control cavity 32 arranged on the control piece 4 and matched with the control shaft 31. The printing head assembly 2 rotates relative to the adjusting seat 1 and switches between the two states under the limiting of the control cavity 32 and is fixed after switching.

[0049] The switching and fixing of the printing head assembly 2 between the two states are realized as follows. The printing head assembly 2 is provided with a giving-up part 22, the control piece 4 passes through the giving-up part 22 and is rotatably pivoted to the adjusting seat 1 through the second pivot S2. The control shaft 31 is arranged in the giving-up part 22 and passes through the control cavity 32, so as to realize that the control piece 4 rotates to drive the control shaft 31 in the control cavity 32 to move along the opening direction of the control cavity 32, thereby switching between the two states.

[0050] In this embodiment, the control cavity 32 includes a first control area 321 that keeps the printhead assembly 2 in a closed state and a second control area 322 that keeps the printhead assembly 2 in an open state. The rotation of the control member 4 allows the control shaft 31 to move between the first control area 321 and the second control area 322. An arc-shaped bend is formed between the first control area 321 and the second control area 322, making the control cavity 32 an arc-shaped cavity. The first control area 321 and the second control area 322 are located at the two ends of the arc-shaped cavity, respectively. When the control member 4 rotates, it drives the control shaft 31 on the printhead assembly 2 to move along the arc-shaped cavity to the first control area 321 or the second control area 322 located at the end point, applying a clamping force at the end point, thus limiting and fixing the printhead assembly 2 at the end point when it is in the open or closed state.

[0051] When in the closed state, the control shaft 31 abuts against and is limited to the first control area 321 at the end of the control cavity 32. At this time, the control member 4 is stably placed between the printhead assembly 2 and the adjusting seat 1 without being subjected to external force, thereby relatively limiting and fixing the printhead assembly 2. Furthermore, the printhead assembly 2 is elastically abutted against within the first control area 321 via the control shaft 31, achieving elastic contact between the printhead 21 and the printing roller, avoiding rigid contact in the printing direction. In this embodiment, the printhead assembly 2 is elastically abutted against within the first control area 321 as follows: the size of the first control area 321 is larger than the size of the control shaft 31, creating a buffer elastic region between the control shaft 31 and the first control area 321. The adjusting seat 1 is provided with an elastic member 5 that provides rotational force to the printhead assembly 2, thereby abutting and fixing the control shaft 31 to the first control area 321. Preferably, the elastic element 5 is placed between the printhead assembly 2 and the adjusting seat 1, and is located in the mounting cavity 11, so as to provide elastic force in the printing direction and rotational force to drive the printhead assembly 2 to rotate, thereby realizing the elastic limiting and fixing of the printhead assembly 2 on the adjusting seat 1.

[0052] Control component 4 is subjected to an externally applied force ( Figure 5 (The direction of the arrow F in the middle indicates the direction of the externally applied force) Rotates along the pivot end, and the printhead assembly 2 switches from the closed state to the open state. At this time, the first control area 321 of the control component 4 rotates to release the limiting fixation of the control shaft 31. The printhead assembly 2 rotates along its pivot end, and the control shaft 31 moves within the control cavity 32 to the second control area 322, and then stops moving under the limiting at the end of the control cavity 32. This allows the printhead assembly 2 to be relatively fixed in the second control area 322 of the control cavity 32 after tilting and rotating relative to the adjustment seat 1, realizing the opening and closing rotation of the printhead assembly 2 along the pivot end to avoid relative movement and facilitate the replacement of printing consumables.

[0053] Example 2

[0054] Combination Figures 6 to 8The application further provides a thermal printer comprising the base 6, the driving mechanism 7 and the printing head position control mechanism. The driving mechanism 7 drives the adjusting seat 1 to move up and down to further change the printing distance between the printing head assembly 2 and the printing paper in the closed state, and cooperates with the transmission mechanism inside the printer to realize the avoidance conveying or pressing printing of the printing paper.

[0055] Specifically, the driving mechanism 7 comprises a motor 71 and a cam 72. The cam 72 is used to drive the adjusting seat 1 to move up and down. In the embodiment, the motor 71 is in transmission connection with the cam 72 to drive the cam 72. The cam 72 is in abutting cooperation with the lower end position of the adjusting seat 1, so that when the cam 72 rotates, the adjusting seat 1 is driven to move up and down under the action of the cam 72, thereby controlling the distance between the printing head assembly 2 on the adjusting seat 1 and the printing paper, corresponding to the pressing printing paper or avoiding the printing paper.

[0056] Preferably, the cam 72 is sleeved on the linkage shaft body 73 and rotates synchronously with the linkage shaft body 73. The linkage shaft body 73 is rotatably arranged in the printer, one end of which is fixedly provided with a hand knob 74. The hand knob 74 is located outside the base 6, which is convenient for the user to manually adjust. Correspondingly, the base 6 is provided with an identification disc 61, and the hand knob 74 is arranged on the identification disc 61 and can rotate relative to the identification disc 61. The identification disc 61 is engraved with a HOME scale indicating the highest position of the printing head assembly 2, so as to facilitate the user to adjust the hand knob 74 to the highest position of the printing head assembly 2. By adjusting the hand knob 74, the linkage shaft body 73 is driven to rotate, so that the cam 72 rotates relatively, thereby manually controlling the height of the printing head assembly 2 in the printer to avoid space for replacing the carbon ribbon and the printing paper.

[0057] Please refer to Figure 6The adjusting seat 1 is provided with a guiding sliding structure matched with the base 6 during relative movement, and the guiding sliding structure enables the adjusting seat 1 to be lifted and lowered relative to the base 6 under the action of the cam 72. In the embodiment, the guiding sliding structure comprises a guiding column 12 arranged on the printer and arranged along the lifting direction of the printhead assembly 2, a bushing 13 arranged on the adjusting seat 1 and slidingly sleeved on the guiding column 12, and a buffer 14 sleeved on the guiding column 12 and providing a downward thrust for the bushing 13. The adjusting seat 1 is lifted and lowered along the guiding column 12 under the abutting action of the cam 72 and the elastic pressing action of the buffer 14, and is elastically arranged in the printer to match the lifting and lowering movement of the adjusting seat 1 relative to the printer under the abutting action of the cam 72, so as to correspondingly move away from or close to the printing paper, thereby adjusting the distance between the printhead 21 and the carbon ribbon, and facilitating the replacement of the carbon ribbon when the printhead 21 is in the open state. The adjusting seat 1 is slidingly arranged along the printing direction and is sleeved with the buffer 14. The buffer 14 provides a buffer force for the adjusting seat 1 during the upward and downward movement and a downward pressing force for the printhead 21 on the printing paper during the printing process. In the embodiment, under the driving of the rotation of the cam 72, the printhead assembly 2 is lifted and lowered along the direction of the cam, thereby driving the adjusting seat 1 to synchronously move up and down, and the entire printhead assembly 2 is buffered by the buffer 14 during the upward and downward movement, thereby ensuring the stability of the movement process. Preferably, the buffer 14 is a spring, and the guiding column 12 is provided with at least two guiding columns, and the buffer 14 and the bushing 13 are arranged in pairs with the guiding column 12.

[0058] Please refer to Figures 7 to 14 The control lever mechanism 8 comprises a control lever 81 and a swing lever 82. One end of the swing lever 82 is controlled by the control lever 81, the other end is matched with the control member 4 via the transmission member 9 to drive the control member 4 to rotate, and the middle part of the swing lever 82 is rotatably pivoted to the base 6. In the embodiment, the control lever 81 controls the swing lever 82 to rotate along the pivoted end in the middle part relative to the base 6, thereby driving the control member 4 matched with the other end of the swing lever 82 to rotate under the swing action of the swing lever 82. The control member 4 is rotated along the pivoted end of the control member 4 under the external applied force to provide power to switch the printhead assembly 2 between the open state and the closed state. The printhead assembly 2 is in the printing working state in the closed state, and is in the open state to make the printhead 21 rotate along the adjusting seat 1 to present an inclined opening, thereby facilitating the replacement of the printing paper, the carbon ribbon, and the internal mechanisms of the printer.

[0059] Further, the control lever 81 comprises a gripping portion 811 and a connecting rod 812 connecting the gripping portion 811 and the swing lever 82. In the embodiment, the connecting rod 812 is horizontally arranged in the interior of the printer, and when the gripping portion 811 is pulled upward, the connecting rod 812 drives the swing lever 82 to rotate along the hinged end thereof, thereby driving the control member 4 to rotate about the hinged end thereof. In the embodiment, the swing lever 82 is regularly bent to avoid being arranged in the interior of the printer. The end of the swing lever 82 away from the connecting rod 812 is driven to drive the control member 4 by abutting against the drive transmission member 9 when the gripping portion is pulled.

[0060] Specifically, the swing lever 82 and the control member 4 are cooperated to drive the control member 4 to rotate via the transmission member 9. The transmission member 9 comprises a pressing swing lever 91 and a return spring 92. The middle portion of the pressing swing lever 91 is hinged to the base 6, and one end is movably connected to the control member 4 to drive the control member 4 to rotate, and the other end is pressed to the swing lever 82. The return spring 92 is arranged on the base 6 and the end of the pressing swing lever 91 close to the control member 4 to provide elastic pressing force to the other end thereof. The end of the pressing swing lever 91 close to the control member 4 is lifted upward by the return spring 92 to provide another external applied force (applied force opposite to the direction of the external applied force F) to the control member 4, so that the control shaft 31 is kept in the first control area 321, and the printhead 21 is in the closed state at this time. Figure 5 The cam 72 continues to rotate to drive the adjusting seat 1 and the printhead assembly 2 to move upward synchronously to relatively avoid the printing paper. The adjusting seat 1 provides downward pressure to the printing of the printhead 21 under the action of the buffer 14.

[0061] It should be noted that the movable connection of the pressing swing lever 91 and the control member 4 provides the rotating force of the control member 4 about the hinged end thereof, and at the same time, the printhead assembly 2 is driven to move along the lifting direction thereof when the printhead assembly 2 moves up and down, at this time, the pressing swing lever 91 and the control member 4 move synchronously to keep the connection therebetween, which can be achieved by that the control member 4 is provided with an avoiding slot 41, and the avoiding slot is arranged in the same direction as the lifting direction of the printhead assembly 2. The pressing swing lever 91 is movably arranged in the avoiding slot 41 and moves relatively in the avoiding slot 41 under the action of the return spring 92 to cooperate with the transmission member 9 to drive the control member 4.

[0062] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiment.

Claims

1. A printhead position control mechanism comprising an adjustment base and a printhead assembly, said printhead assembly having a printhead at one end and being pivotally coupled at the other end to said adjustment base, characterized by, The control structure comprises a control shaft arranged on the print head assembly and a control cavity arranged on the control member and matched with the control shaft, the print head assembly rotates relative to the adjusting seat and switches between the two states under the limit of the control cavity; the control cavity comprises a first control area for making the print head in the closed state and a second control area for making the print head in the open state, the control member rotates to make the control shaft move between the first control area and the second control area; the size of the first control area is greater than the size of the control shaft, so that there is a buffer elastic area between the control shaft and the first control area; wherein the first control area and the second control area form an arc bending structure, so that the control cavity formed thereby is an arc-shaped cavity, and the first control area and the second control area are respectively located at the two end point positions of the arc-shaped cavity; the elastic member is arranged between the print head assembly and the adjusting seat.

2. The printhead position control mechanism of claim 1, wherein The adjusting seat is provided with a mounting cavity, and the pivot connection part of the print head assembly and the pivot connection part of the control member with the adjusting seat are located in the mounting cavity.

3. The printhead position control mechanism of claim 2, wherein, The print head assembly is provided with a clearance portion, the control member passes through the clearance portion and is rotatably connected with the adjusting seat, and the control shaft is arranged in the clearance portion.

4. A thermal printer comprising a base and a drive mechanism, characterised in that, The print head position control mechanism further comprises the drive mechanism, the drive mechanism drives the adjusting seat to move up and down to further change the printing distance between the print head in the closed state and the printing paper.

5. The thermal printer according to claim 4, characterized by The drive mechanism comprises a motor and a cam, and the cam drives the adjusting seat to move up and down.

6. The thermal printer according to claim 4, wherein The control lever mechanism comprises a control lever and a swing lever, one end of the swing lever is controlled by the control lever, the other end of the swing lever is matched with the control member through a transmission member to drive the control member to rotate, and the middle part of the swing lever is rotatably connected to the base.

7. The thermal printer according to claim 6, characterized by The transmission member comprises a pressing swing lever and a return spring, the middle part of the pressing swing lever is hingedly connected to the base, one end of the pressing swing lever is movably connected to the control member to drive the control member to rotate, the other end of the pressing swing lever is pressed to the swing lever, and the return spring is arranged on the base and the end of the pressing swing lever close to the control member to provide elastic pressing force for the other end of the pressing swing lever.

8. The thermal printer according to claim 4, characterized by The adjusting seat is provided with a guide sliding structure matched with the base when the base moves relative to the adjusting seat, the guide sliding structure comprises a guide column arranged on the printer and arranged along the lifting direction of the print head assembly, a bushing arranged on the adjusting seat and slidably sleeved on the guide column, and a buffer member sleeved on the guide column to provide downward pushing force for the bushing.

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