Thermal printer core and thermal printer

Abstract

The invention provides a thermal printer core and a thermal printer. The thermal printer core comprises a main body, and a rubber roller assembly, a thermal sheet assembly and an elastic piece which are mounted on the main body, the elastic piece, the thermosensitive piece assembly and the rubber roller assembly abut against one another in sequence, and a paper feeding position is formed between the thermosensitive piece assembly and the rubber roller assembly. On the axial projection of the rubber roller assembly, the arrangement direction of the elastic piece, the thermosensitive piece assembly and the rubber roller assembly is inclined to the thickness direction of the thermosensitive printer core, and the tape feeding direction of the paper feeding position is inclined to the width direction of the thermosensitive printer core. The thermal printer comprises the thermal printer core. According to the invention, the thickness is effectively reduced by improving the movement structure and the structural layout, so that the printer body can be thinner to meet the requirement of appearance optimization.

Description

Technical Field

[0001] The invention relates to the technical field of thermal printers, and in particular to a thermal printer mechanism and a thermal printer with improved mechanism design to achieve the effect of reducing the height of the entire machine. Background Art

[0002] See also Figure 8 The thermal printer body is provided with a thermal printer mechanism, the thickness direction of the thermal printer mechanism is consistent with the thickness direction of the body, and correspondingly, the width direction of the thermal printer mechanism is consistent with the width direction of the body, and the width direction is perpendicular to the thickness direction. The thermal printer mechanism includes a main body and a rubber roller assembly 91, a thermal sheet assembly 92 and a spring 93 arranged on the main body in sequence roughly along the thickness direction. A paper feeding position is formed between the thermal sheet assembly 92 and the rubber roller assembly 91, and the tape feeding direction of the paper feeding position is the width direction, and the width direction is perpendicular to the axial direction of the rubber roller assembly 91. Figure 8 As shown, the thickness direction is vertical, and the width direction and the axial direction of the rubber roller assembly 91 are both horizontal. The spring 93 is a pressure spring, and the spring is used to achieve the floating of the thermal sheet assembly 92.

[0003] The problem with existing thermal printer mechanisms is that the printer body is generally thick and cannot meet the requirements for a thin and light appearance. Summary of the invention

[0004] The first object of the present invention is to provide a thermal printer mechanism with improved component layout to effectively reduce the thickness, so that the printer body can be made thinner to meet the demand for appearance optimization.

[0005] A second object of the present invention is to provide a thermal printer with a thinner body.

[0006] The first purpose of the present invention provides a thermal printer mechanism comprising a main body and a rubber roller assembly, a thermal sheet assembly and an elastic member installed on the main body; the elastic member, the thermal sheet assembly and the rubber roller assembly are abutted against each other in sequence, and a paper feeding position is formed between the thermal sheet assembly and the rubber roller assembly; on the axial projection of the rubber roller assembly, the arrangement direction of the elastic member, the thermal sheet assembly and the rubber roller assembly is inclined to the thickness direction of the thermal printer mechanism, and the tape feeding direction of the paper feeding position is inclined to the width direction of the thermal printer mechanism.

[0007] From the above, it can be seen that after analysis, the reason why the printer body cannot be made thinner is that the rubber roller assembly, thermal film assembly and spring are arranged along the thickness direction, which makes the thermal printer mechanism thicker. For this reason, the present invention first optimizes the internal structure arrangement. Under this setting, taking a horizontally placed printer as an example, the present invention arranges the springs, thermal film assemblies and rubber roller assemblies that were originally arranged vertically or nearly vertically into an inclined arrangement, so that the thickness of the thermal printer mechanism is greatly reduced; in addition, unexpectedly, this setting also makes the paper feed channel inclined, which can realize the "top in front out" paper feeding method, which is more convenient for users to take and put operations compared to the "back in front out" paper feeding method of the background technology, thereby improving the user experience.

[0008] A further solution is that the elastic member is a torsion spring; the thermal sheet assembly is rotatably arranged around a first axis, and the thermal sheet assembly includes a rotating connection portion located at the first axis and a swinging portion spaced apart from the first axis; the base of the torsion spring is arranged at a second axis, the first elastic arm of the torsion spring abuts against the main body, and the second elastic arm of the torsion spring abuts against the swinging portion; the rubber roller assembly is opposite to the swinging portion, and the rotating connection portion is opposite to the base.

[0009] As can be seen from the above scheme, in the background technology, the elastic member is a pressure spring, and the vertical pressure spring is fixed on the horizontal main body plate by means of a positioning column; however, if the elastic member, the thermal sheet assembly and the rubber roller assembly are arranged obliquely, the inclined pressure spring is difficult to be installed and fixed on the horizontal main body plate. For this reason, the present invention uses a torsion spring as the elastic member instead, so that the torsion spring can be fixed by a horizontal torsion spring mounting shaft, and, compared with the pressure spring, the height of the torsion spring is smaller and further helps to reduce the thickness of the movement. In addition, it is unexpected that, since the torsion spring needs to abut the rubber roller assembly with its first elastic arm on the opposite sides of the thermal sheet assembly, that is, under this setting, the base with the largest thickness on the torsion spring and the rubber roller assembly must be misaligned and arranged along the "%" shape, compared with arranging the three along the "I" shape, this can further reduce the thickness of the movement, and then make the printer body thinner to meet the appearance optimization requirements.

[0010] A further solution is that in the normal direction of the thermal sheet assembly, the thermal sheet assembly includes a first side and a second side opposite to each other; the rubber roller assembly is located on the first side and the torsion spring is located on the second side.

[0011] As can be seen from the above, in theory, the torsion spring can be arranged on the first side of the thermal sheet together with the rubber roller assembly, and the second elastic arm of the torsion spring is bent around the second side of the thermal sheet assembly to provide a force, which can also reduce the thickness of the compression core and the body. However, the first side of the thermal sheet assembly is the thermal sheet, which is a sensitive device and needs to be electrically connected. Therefore, it is better to stagger the rubber roller assembly and the spring located on both sides of the thermal sheet assembly into a "%" shape to avoid affecting the normal operation of the thermal sheet.

[0012] A further solution is that the thermal printer core rubber roller assembly is rotatably arranged around a third axis; on the axial projection of the first axis, the normal of the thermal film assembly forms a first angle with the thickness direction of the thermal printer core, and the line direction connecting the second axis and the third axis forms a second angle with the thickness direction of the thermal printer core, and the second angle is greater than the first angle.

[0013] As can be seen from the above, when the second angle is greater than the first angle, the thickness of the core is reduced relative to the prior art. Within a certain angle range, the larger the second angle, the smaller the thickness of the core. Of course, the larger the second angle, the larger the width of the core, so the second angle can be adjusted according to the actual needs of the printer body appearance.

[0014] Another further solution is that the main body includes a fixed torsion spring mounting shaft and a torsion spring bracket; the bases of at least two torsion springs are sleeved on the torsion spring mounting shaft; the first elastic arm abuts against the torsion spring bracket, the torsion spring bracket is provided with a first snap-fit ​​portion, the first elastic arm is provided with a second snap-fit ​​portion, and the first snap-fit ​​portion is snapped with the second snap-fit ​​portion.

[0015] As can be seen from the above, after the spring is replaced with a torsion spring, it is also necessary to consider how the torsion spring is installed and fixed. In addition, generally speaking, the long strip of thermal sensitive sheet assembly needs to be supported by multiple elastic parts, so it is necessary to further consider how multiple torsion springs are installed and fixed. To this end, the present invention, based on the concentricity of the central holes of the winding bases of multiple torsion springs arranged along a straight line, inserts a torsion spring installation shaft to simultaneously complete the center positioning of multiple torsion springs, and adds a torsion spring bracket to fix the first elastic arm of the torsion spring. The cooperation of the first buckle part and the second buckle part effectively prevents the torsion spring from disengaging, and further ensures the installation stability of the torsion spring. In this way, multiple torsion springs can be stably and reliably assembled in the movement.

[0016] A further solution is that the torsion spring mounting shaft and the torsion spring bracket are arranged in sequence along the width direction of the thermal printer mechanism.

[0017] As can be seen from the above, under this setting, the torsion spring mounting shaft and the torsion spring bracket do not increase the thickness of the movement.

[0018] A further solution is that the torsion spring includes two bases spaced apart along its own axial direction; two first elastic arms include a first rod extending from the two bases respectively and a bent section connected to the end of the first rod, the bent section serving as a first snap portion; the second elastic arm includes a second rod extending from the two bases respectively and a cross rod bent and connected between the two second rods.

[0019] As can be seen from the above, since the length of the torsion spring does not affect the thickness of the movement and the printer body, the present invention uses a double torsion spring, and its "door"-shaped second elastic arm can form a better and more stable abutment relationship with the thermal film assembly, ensuring that the interaction force between the thermal film assembly and the rubber roller assembly at each mating point is consistent, further ensuring the printing effect.

[0020] Another further solution is that the main body also includes a bottom plate and a side plate; the two side plates are arranged opposite to each other along the axial direction of the first axis, and the extended ends of the bottom plate are respectively fixed to the two side plates; the axial ends of the torsion spring mounting shaft are respectively connected to the two side plates, and the torsion spring bracket is connected to the bottom plate.

[0021] A further solution is that a first axial hole is set on the side plate, a first short shaft is set on the thermal sensitive sheet assembly, and the first short shaft is inserted and matched with the second axial hole; and / or, a second axial hole is set on the side plate, a second short shaft is set at the axial end of the torsion spring mounting shaft, and the second short shaft is inserted and matched with the second axial hole.

[0022] As can be seen from the above, this arrangement utilizes the simultaneous assembly of multiple components between the side panels to improve assembly efficiency.

[0023] A further solution is that the bottom plate supports the torsion spring bracket from the width direction and / or thickness direction of the thermal printer mechanism.

[0024] It can be seen from the above that in addition to being the basic structure of the main body, the bottom plate also serves as a structure supporting the torsion spring bracket, further ensuring that the torsion spring bracket and the torsion spring have better stability.

[0025] The second object of the present invention is to provide a thermal printer comprising the above-mentioned thermal printer mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axial cross-sectional view of the first embodiment of the thermal printer mechanism of the present invention.

[0027] Figure 2 It is a structural exploded view of the first embodiment of the thermal printer mechanism of the present invention.

[0028] Figure 3 It is a structural diagram of the side plate in the first embodiment of the thermal printer mechanism of the present invention.

[0029] Figure 4 It is a partial view of the bottom plate in the first embodiment of the thermal printer mechanism of the present invention.

[0030] Figure 5 It is a structural diagram of some components of the first embodiment of the thermal printer mechanism of the present invention.

[0031] Figure 6 It is a partial view of the torsion spring bracket in the first embodiment of the thermal printer mechanism of the present invention.

[0032] Figure 7 1 is a structural diagram of a torsion spring in the first embodiment of the thermal printer mechanism of the present invention.

[0033] Figure 8 The schematic diagram of the thermal printer mechanism of the background art is shown in FIG.

[0034] Fig. 9 FIG. 1 is a schematic diagram of a first embodiment of a thermal printer mechanism of the present invention.

[0035] Fig.10 FIG. 2 is a schematic diagram of a second embodiment of a thermal printer mechanism of the present invention. DETAILED DESCRIPTION

[0036] Thermal Printer Mechanism First Embodiment See also Figure 1 and Figure 2 The thermal printer of the present invention comprises a thermal printer mechanism, which comprises a main body 1, a thermal sheet assembly 2, a rubber roller assembly 3, a torsion spring 4 and a gear set 7. The main body 1 comprises a side plate 12, a bottom plate 11, a torsion spring mounting shaft 5, a torsion spring bracket 6 and screws. The thermal sheet assembly 2 comprises a thermal sheet 21, a fixing frame 22 and a side connecting frame 23. The gear set 7 is connected to the outer side of one of the side plates 12.

[0037] The axial directions of the components and assemblies in the following text are the same. Figure 2 The y-axis direction is used as an illustration. In this embodiment, the thickness direction of the thermal printer is consistent with the thickness direction of the thermal printer mechanism, the width direction of the thermal printer is consistent with the width direction of the thermal printer mechanism, the thickness direction of the thermal printer mechanism is vertical, the width direction and the axial direction of the thermal printer mechanism are both horizontal directions, and the width direction and the axial direction are perpendicular to each other.

[0038] See also Figures 2 to 4 The two side plates 12 are arranged opposite to each other along the axial direction (the y-axis direction in the figure) of the first axis 200, and the two extended ends of the bottom plate 11 are respectively fixed to the two side plates 12. In this embodiment, the two axial ends of the bottom plate 11 are provided with two first insertion holes 116 and a first connection hole 111 penetrating along the plate thickness direction thereof, and a first folded edge 14 bent upward, and a second connection hole 140 penetrating along the axial direction is provided on the first folded edge 14.

[0039] Correspondingly, the lower end of the side plate 12 is provided with two first tongues 126 extending downward, the side plate 12 is provided with a third connecting hole 124, the lower end of the side plate 12 is provided with a second folded edge 121 extending axially, and the second folded edge 121 is provided with a fourth connecting hole 1210.

[0040] The side plate 12 is connected to the bottom plate 11, the two first plug tongues 126 are respectively inserted into the two first plug holes 116, the second folded edge 121 overlaps with the bottom plate 12, the first connection hole 111 is connected to the fourth connection hole 1210, and the two are locked with screws. The first folded edge 14 overlaps with the side plate 12, the second connection hole 140 is connected to the third connection hole 124, and the two are locked with screws.

[0041] See also Figure 4 and Figure 5 A first axial hole 122 is provided on the side plate 12, and first short shafts 29 located at the first axis 200 are provided at both axial ends of the thermal sheet assembly 2, and the first short shaft 29 is inserted and matched with the first axial hole 122; a second axial hole 125 is also provided on the side plate 12, and second short shafts 59 located at the second axis 500 are provided at both axial ends of the torsion spring mounting shaft 5, and the second short shaft 59 is inserted and matched with the second axial hole 125; a third axial hole 123 is also provided on the side plate 12, and third short shafts 39 located at the third axis 300 are provided at positions near the ends on both axial sides of the rubber roller assembly 3, and the third short shaft 39 is inserted and matched with the third axial hole 123, and the rubber roller assembly 3 is rotatably arranged around the third axis 300.

[0042] See also Figure 5 In the thermal sheet assembly 2 , the thermal sheet 21 is bonded to the fixing frame 22 , two side connecting frames 23 are respectively fixed to the axial ends of the fixing frame 22 by screws, and two first short shafts 29 are respectively arranged on the two side connecting frames 23 .

[0043] See also Figure 3 , Figure 5 and Figure 6 The torsion spring bracket 6 includes a width direction of the thermal printer mechanism ( Figure 1 The two vertical parts 69 are respectively provided with a second plug tongue 62 and a third plug tongue 63 extending downward, and the second plug tongue 62 is also provided with a fifth connecting hole 620; see in particular Figure 3 The rear side of the bottom plate 11, i.e., the side of the bottom plate 11 in the width direction of the thermal printer mechanism, is provided with an upwardly bent rib 163, the main body of the bottom plate 11 is provided with a second plug hole 161 between the ribs 163, and the rib 163 is provided with a sixth connection hole 160 just above the second plug hole 161. In addition, the main body of the bottom plate 11 is also provided with a third plug hole 162.

[0044] Combination Figure 1 The torsion spring bracket 6 is arranged between the two side plates 12 and fixedly mounted to the bottom plate 11, the second plug tongue 62 is inserted into the second plug hole 161, the third plug tongue 63 is inserted into the third plug hole 162, and the vertical portion 69 of the second plug tongue 62 provided on the torsion spring bracket 6 overlaps with the retaining edge 163 along the above-mentioned width direction, the fifth connecting hole 620 is connected with the sixth connecting hole 160 and the two are locked with screws.

[0045] See also Figure 1 and Figure 5 , see in particular Figure 1 As shown in the axial projection, the torsion spring bracket 6, the torsion spring mounting shaft 5, the thermal sheet assembly 2 and the rubber roller assembly 3 are arranged in sequence along the width direction of the thermal printer mechanism.

[0046] Continue to see Figure 5 and Figure 6 The torsion spring bracket 6 includes a horizontal portion 68 connected between the two vertical portions 69, and a second buckle portion 61 is formed on the horizontal portion 68 by bending upward, and a buckle opening 610 is formed on one side of the second buckle portion 61 and opens toward the axial direction. The torsion spring bracket 6 is provided with a plurality of pairs of second buckle portions 61 spaced apart along its own axial direction, and the openings of the buckle openings 610 of each pair of two second buckle portions 61 are opposite.

[0047] The torsion spring 4 includes a base 40, a first elastic arm 41 and a second elastic arm 42. In this embodiment, the torsion spring 4 includes two bases 40 that are spaced apart along the axial direction thereof and are wound into a cylindrical shape, the two first elastic arms 41 are respectively provided with first rods 411 extending from the two bases 40 and a bent section 412 connected to the end of the first rod 411, and the bent section 412 serves as a first buckle portion; the second elastic arm 42 includes second rods 421 extending from the two bases 40 and a crossbar 422 bent and connected between the two second rods 421.

[0048] The base 40 of all torsion springs 4 is sleeved on the torsion spring mounting shaft 5 and is located at the second axis 500. The two first elastic arms 41 of each torsion spring 4 are respectively buckled into the buckling openings 610 of the two paired second buckling parts 61, and the first elastic arms 41 abut against the horizontal part 68 of the torsion spring bracket.

[0049] See especially Figure 1 , the thermal sheet assembly 2 is rotatably arranged around the first axis 200. Along the extension direction of the thermal sheet assembly 2, the thermal sheet assembly 2 includes a rotating connection portion 201 located at the first axis 200 and a swinging portion 202 at a distance from the first axis 200; in the normal direction of the thermal sheet assembly 2 (direction a in the figure), the thermal sheet assembly 2 includes a first side 208 and a second side 209 opposite to each other, the rubber roller assembly 3 is located on the first side 208 and the torsion spring 4 is located on the second side 209, the second elastic arm 42 of the torsion spring 4 abuts against the swinging portion 202, and the rubber roller assembly 3 is opposite to the swinging portion 202. More specifically, the rubber roller assembly 3 is opposite to the swinging portion 202 along the second straight line L2, the rotating connection portion 201 is opposite to the base 40 along the first straight line L1, and, in Figure 1 It can be seen from the axial projection that the first straight line L1 and the second straight line L2 both extend along the normal direction of the thermal sheet assembly 2, and there is a large distance between the first straight line L1 and the second straight line L2 along the extension direction of the thermal sheet assembly 2. In this manner, the rubber roller assembly 3, the thermal sheet assembly 2 and the torsion spring 4 are arranged in a "%" shape.

[0050] Combination Figure 1 , Figure 8 and Fig. 9 , and compare Figure 8 and Fig. 9 , Figure 8In the prior art shown in the figure, the rubber roller assembly 91, the thermal sheet assembly 92 and the spring 93 are arranged vertically in a nearly straight line. Figure 1 and Fig. 9 In the embodiment shown, firstly, on the axial projection of the rubber roller assembly, the arrangement direction of the torsion spring 4, the thermal sheet assembly 2 and the rubber roller assembly 3, that is, the line direction of the second axis 500 and the third axis 300 (direction b in the figure) is inclined to the thickness direction of the thermal printer mechanism, so that the thickness of the thermal printer mechanism is greatly reduced, and the angle between the b direction and the y direction is smaller than the angle between the a direction and the z direction.

[0051] Furthermore, the rubber roller assembly 3, the thermal sheet assembly 2 and the torsion spring 4 are arranged in a staggered manner in a "%" shape. At this time, it can be seen that in the axial projection of the first axis 200, the normal direction of the thermal sheet assembly 2 forms a first angle with the thickness direction of the thermal printer core, and the connecting direction of the second axis 500 and the third axis 300 (direction b in the figure) forms a second angle with the thickness direction of the thermal printer core, and the second angle is greater than the first angle.

[0052] In addition, unexpectedly, the torsion spring 4, the thermal sheet assembly 2 and the rubber roller assembly 3 are arranged obliquely, so that the paper feeding direction c of the paper feeding position 2000 formed between the thermal sheet assembly 2 and the rubber roller assembly 3 is inclined to the width direction x of the thermal printer mechanism.

[0053] Comparison Figure 8 and Fig. 9 In the figure, the rubber roller assembly 3, the thermal sheet assembly 2 and the elastic members (spring 93 and torsion spring 4) with the same size are compared. Fig. 9 The thickness of the embodiment shown is greatly reduced, and the reduction degree of thickness is greater than the increase degree of width, and the area of ​​the smallest circumscribed rectangle of the axial projection is reduced. It can be seen that the present invention improves the structure and arrangement of the core components, and makes the printer body thinner to meet the requirements of appearance optimization while ensuring the printing effect.

[0054] Thermal Printer Mechanism Second Embodiment See also Fig.10 In this embodiment, the elastic member 96 adopts a pressure spring, and the elastic member 96, the thermal sheet assembly 95 and the rubber roller assembly 94 are arranged along a straight line, and the arrangement direction a of the elastic member 96, the thermal sheet assembly 95 and the rubber roller assembly 94 is inclined to the thickness direction of the thermal printer mechanism.

[0055] In this embodiment, although the elastic member 96, the thermal sheet assembly 95 and the rubber roller assembly 94 are not arranged in a "%" shape, the inclined arrangement can still reduce the thickness of the thermal printer mechanism to a certain extent.

[0056] In other embodiments, a fixing clip may be used to clamp the base of the torsion spring, so there is no need to provide a torsion spring mounting shaft.

[0057] In other embodiments, the first elastic arm of the torsion spring abuts against the protrusion of the bottom plate, so there is no need to provide a torsion spring bracket.

[0058] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermal printer mechanism, comprising a main body and a rubber roller assembly, a thermal sheet assembly and an elastic member installed on the main body; the elastic member, the thermal sheet assembly and the rubber roller assembly are abutted against each other in sequence, and a paper feeding position is formed between the thermal sheet assembly and the rubber roller assembly; Features: In the axial projection of the rubber roller assembly, the arrangement directions of the elastic member, the thermal sheet assembly and the rubber roller assembly are inclined to the thickness direction of the thermal printer mechanism, and the tape feeding direction of the paper feeding position is inclined to the width direction of the thermal printer mechanism.

2. The thermal printer mechanism according to claim 1, characterized in that: The elastic member is a torsion spring; The thermal sheet assembly is rotatably arranged around a first axis, and the thermal sheet assembly comprises a rotating connection portion located at the first axis and a swing portion spaced apart from the first axis; The base of the torsion spring is arranged at the second axis, the first elastic arm of the torsion spring abuts against the main body, and the second elastic arm of the torsion spring abuts against the swinging part; The rubber roller assembly is opposite to the swinging part, and the rotating connecting part is opposite to the base.

3. The thermal printer mechanism according to claim 2, characterized in that: In the normal direction of the thermal sheet assembly, the thermal sheet assembly includes a first side and a second side opposite to each other; The rubber roller assembly is located on the first side and the torsion spring is located on the second side.

4. The thermal printer mechanism according to claim 3, characterized in that: The rubber roller assembly is rotatably arranged around a third axis; In the axial projection of the first axis, the normal of the thermal sheet assembly forms a first angle with the thickness direction of the thermal printer core, and the line direction between the second axis and the third axis forms a second angle with the thickness direction of the thermal printer core, and the second angle is greater than the first angle.

5. The thermal printer mechanism according to any one of claims 2 to 4, characterized in that: The main body comprises a fixedly arranged torsion spring installation shaft and a torsion spring bracket; The bases of at least two of the torsion springs are sleeved on the torsion spring mounting shaft; The first elastic arm is in contact with the torsion spring bracket, the torsion spring bracket is provided with a first buckle portion, the first elastic arm is provided with a second buckle portion, and the first buckle portion is buckled with the second buckle portion.

6. The thermal printer mechanism according to claim 5, characterized in that: The torsion spring installation shaft and the torsion spring bracket are arranged in sequence along the width direction of the thermal printer mechanism.

7. The thermal printer mechanism according to claim 5, characterized in that: The torsion spring comprises two bases spaced apart along its axial direction; The two first elastic arms are respectively formed of a first rod extending from the two bases and a bending section connected to the end of the first rod, wherein the bending section serves as the first buckle portion; The second elastic arm includes second rods extending from the two bases respectively and a cross bar bent and connected between the two second rods.

8. The thermal printer mechanism according to claim 5, characterized in that: The main body also includes a bottom plate and side plates; The two side plates are arranged opposite to each other along the axial direction of the first axis, and the two extended ends of the bottom plate are respectively fixedly connected to the two side plates; The axial ends of the torsion spring installation shaft are respectively connected to the two side plates, and the torsion spring bracket is connected to the bottom plate.

9. The thermal printer mechanism according to claim 8, characterized in that: The side plate is provided with a first shaft hole, the thermal sheet assembly is provided with a first short shaft, and the first short shaft is plug-fitted with the second shaft hole; and / or, A second axial hole is arranged on the side plate, a second short shaft is arranged at the axial end of the torsion spring installation shaft, and the second short shaft is inserted and matched with the second axial hole.

10. The thermal printer mechanism according to claim 8, characterized in that: The bottom plate supports the torsion spring bracket from a width direction and a thickness direction of the thermal printer mechanism.

11. A thermal printer, characterized in that: A thermal printer mechanism comprising any one of claims 1 to 10.

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