CN111421964A

CN111421964A - Novel thermal printer with carbon ribbon

Info

Publication number: CN111421964A
Application number: CN202010126258.1A
Authority: CN
Inventors: 张毅
Original assignee: Lineng Shenzhen Technology Co ltd
Current assignee: Lineng Shenzhen Technology Co ltd
Priority date: 2019-12-31
Filing date: 2020-02-26
Publication date: 2020-07-17

Abstract

The invention discloses a novel thermal printer with a carbon ribbon, which comprises a printing base and a printing component, wherein the printing component is arranged at the upper end of the printing base and is provided with a carbon ribbon bin; the printing component comprises a structure frame, a power carbon belt shaft arranged on the structure frame, a rewinding carbon belt shaft arranged on the side edge of the power carbon belt shaft, a driving assembly used for driving the power carbon belt shaft to rotate, a power shaft hand wheel sleeved on the power carbon belt shaft, a rewinding shaft hand wheel sleeved on the rewinding carbon belt shaft, a protection box used for installing the driving assembly, a structure upper cover arranged at the upper end of the structure frame and used for shielding a carbon belt bin, a printing head arranged at the lower end of the structure frame, and a printing head cover plate used for fixing the printing head. The thermal printer for the carbon ribbon overcomes the problem that printing can be realized by non-thermal paper, can be implemented on common paper, brings economic advantages for enterprise production and management, and is convenient to detach, install and maintain.

Description

Novel thermal printer with carbon ribbon

Technical Field

The invention relates to the technical field of printers, in particular to a novel thermal printer with a thermal ribbon.

Background

With the improvement and innovation of industrial technology, the existing printer, such as the cross 2401, including the motor, the electrical control box, the frame, the printing head, the ribbon, etc., is mainly used for printing documents, and can not print font patterns on ticket paper or non-thermosensitive paper.

At present, the non-thermal paper printing mode is mainly to stamp the date of delivery at the sealing position by a sealing machine, or to print the entrance ticket information on the entrance ticket paper material by an ink type printing machine. The sealing machine has the disadvantages that printed characters are unclear and obvious, the production cost is higher by using an ink type printing machine, and the heat-sensitive paper is not suitable for the current enterprise operation needs, generally, the price of the heat-sensitive paper is better, and the heat-sensitive paper is used for a long time to bring economic waste to places with higher ticket demands, such as tourist attractions.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

The applicant proposes a new thermal printer with thermal ribbon, aiming to solve the above mentioned problems.

Disclosure of Invention

In order to meet the above requirements, it is an object of the present invention to provide a novel thermal printer with a thermal ribbon.

In order to achieve the purpose, the invention adopts the following technical scheme:

a novel thermal printer with a carbon ribbon comprises a printing base and a printing component which is arranged at the upper end of the printing base and is provided with a carbon ribbon bin;

the printing component comprises a structural frame, a power carbon belt shaft arranged on the structural frame, a rewinding carbon belt shaft arranged on the side edge of the power carbon belt shaft, a driving assembly used for driving the power carbon belt shaft to rotate, a power shaft hand wheel sleeved on the power carbon belt shaft, a rewinding shaft hand wheel sleeved on the rewinding carbon belt shaft, a protection box used for mounting the driving assembly, a structural upper cover arranged at the upper end of the structural frame and used for shielding a carbon belt bin, a printing head arranged at the lower end of the structural frame, and a printing head cover plate used for fixing the printing head;

the printing base comprises a rear inner cover, a slidable paper slot arranged on the rear inner cover, a sensor support arranged on the slidable paper slot, and a positioning sensor arranged on the sensor support and used for detecting the position of printing paper;

the carbon belt is arranged on the power carbon belt shaft, the carbon belt is in contact with the lower end of the printing head and is rewound by the rewinding carbon belt shaft, and the printing head is used for driving the carbon belt to print printing paper arranged in the slidable paper slot by utilizing a thermal effect;

the power carbon tape spool, the carbon tape spool of rolling back all are connected with the structure frame is detachable, the structure frame is equipped with and is used for fixed power carbon tape spool, the carbon tape spool of rolling back and installs the subassembly of dismantling in the guard box.

In one possible embodiment, the structural frame is provided with a first mounting groove and a second mounting groove for mounting a power carbon belt shaft and a rewinding carbon belt shaft, and the detachable components are mounted on the outer sides of the first mounting groove and the second mounting groove;

the detachable assembly comprises a clasp structure and a baffle structure, wherein the clasp structure is provided with hook-shaped parts at two ends for clamping the power carbon belt shaft and the rewinding carbon belt shaft, and the baffle structure is arranged on the outer side of the clasp structure and used for fixing the clasp structure;

the hook-shaped part is rotatably or elastically connected with the clasp structure.

In one possible embodiment, the driving assembly comprises a driving motor arranged on the structural frame, and a turbine which is in transmission connection with an output shaft of the driving motor and sleeved on the power carbon belt shaft;

the output shaft of driving motor is equipped with the external screw thread that is used for being connected with the turbine meshing, a plurality of switches that are used for controlling driving motor and the pilot lamp that is used for demonstrateing operating conditions are installed to the guard box.

In a possible implementation mode, the rewinding shaft hand wheel is further connected with a limiting clutch plate which rotates synchronously with the rewinding shaft hand wheel, the limiting clutch plate is wound with a carbon ribbon tensioning tension spring, one end of the carbon ribbon tensioning tension spring is fixed to the structural frame, the other end of the carbon ribbon tensioning tension spring is fixed to the limiting clutch plate, and the carbon ribbon tensioning tension spring is used for pre-tightening the carbon ribbon when the carbon ribbon starts to work.

In one possible embodiment, a paper outlet nozzle is connected to the printing base, and the paper outlet nozzle is communicated with the slidable paper slot.

In one possible embodiment, a rubber roller for driving printing paper to move is arranged between the paper outlet nozzle and the slidable paper slot on the printing base.

In one possible embodiment, a fixed blade and a movable blade hinged with the fixed blade and used for cutting printing paper are arranged between the printing base and the front inner cover and the paper outlet nozzle; the movable blade is provided with a rotary sliding groove, the rotary sliding groove is provided with a protruding part, the protruding part is connected with a cam installed inside the printing base, a motor is further installed inside the printing base and is connected with the cam in a transmission mode, and the motor is used for driving the cam to rotate so as to drive the movable blade to rotate.

In a possible implementation manner, paper output sensors for detecting whether printing paper exists are arranged between the printing base and the paper output nozzles, and the number of the paper output sensors is at least 2, and the paper output sensors are respectively distributed at positions above the paper output nozzles and at positions below the paper output nozzles.

In a possible implementation mode, a hinge rotating shaft for connecting the printing base and the printing component is arranged between the printing base and the printing component, the printing component is provided with a fixing pin, and the printing base is provided with a locking head which is detachably connected with the fixing pin through a button.

In a possible implementation mode, the structure frame is provided with a plurality of sensors used for detecting whether the power shaft hand wheel and the rewinding shaft hand wheel rotate or not, the structure frame is provided with a plurality of through holes used for installing the sensors, and the power shaft hand wheel and the rewinding shaft hand wheel are close to one end of the structure frame and are provided with a plurality of contrast grooves opposite to the through holes.

Compared with the prior art, the invention has the beneficial effects that: the carbon ribbon thermal printer of this scheme of adoption, the problem of printing has been realized to non-thermal paper side of having overcome, can implement to print on ordinary paper, for enterprise's production and management has brought the advantage on the economy, simultaneously because this scheme has detachable power carbon tape spool, rewind carbon tape spool and can dismantle the subassembly, convenient to detach installation is maintained, in addition, set up and can effectively detect out the paper mouthful and whether have the ticket of printing in the sensor of paper outlet nozzle, set up in the sensor in slidable paper groove, set up and also can realize detecting whether the paper is removing in the sensor of structure frame side, whether power carbon tape spool and rewind carbon tape spool rotate, so that judge whether the printer normally works.

The invention is further described below with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a novel thermal ribbon printer of the present invention;

FIG. 2 is a schematic view of the printer of FIG. 1 with the paper nozzle hidden;

FIG. 3 is a schematic view of the structure of FIG. 1 from another angle;

FIG. 4 is a schematic view of the slidable paper slot of the printer of FIG. 1;

FIG. 5 is a schematic view of the printer of FIG. 1 with the nozzle hidden structure (including the sensor);

FIG. 6 is a schematic diagram of the internal structure of the printing element of the printer of FIG. 1;

FIG. 7 is a schematic diagram of the structure of the printing element of the printer of FIG. 1;

FIG. 8 is an exploded view of the powered carbon ribbon spool of the printer of FIG. 1;

FIG. 9 is an exploded view of the carbon tape spool of the printer of FIG. 1;

FIG. 10 is an exploded view of the printing element of the printer of FIG. 1.

Reference numerals

1 print 2 carbon ribbon storehouses of base

3 hinge pivot 4 fixed pins

5 rubber roller 6 printing head

7 lock 8 rear inner cover

9 paper outlet 10 slidable paper slot

11 sensor support 12 positioning sensor

13 paper out sensor 14 power carbon tape shaft

15-rewinding carbon tape shaft 16 driving motor

17 worm 18 worm wheel

19 power shaft hand wheel 20 rewinding shaft hand wheel

21 switch 22 indicator lamp

23 washer 24 compression spring

25 fixed screw 26 carbon ribbon tension spring

27 spacing clutch disc of extension spring set screw 28

29 structure upper cover 30 clasp structure

31 baffle structure 32 print head positioning shaft

33 print head cover 34 fixed blade

35 structure frame 36 protective box

37 first mounting groove 38 second mounting groove

39 hook 40 through hole

41 rotary sliding groove 42 projection

43 motor 44 front inner cover

45 contrast tank

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means 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 with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9 and fig. 10, the novel thermal printer for thermal ribbon according to the present invention comprises a printing base 1, a printing component mounted on the upper end of the printing base 1 and provided with a carbon ribbon cartridge 2;

the printing component comprises a structure frame 35, a power carbon belt shaft 14 arranged on the structure frame 35, a rewinding carbon belt shaft 15 arranged on the side edge of the power carbon belt shaft 14, a driving component for driving the power carbon belt shaft 14 to rotate, a power shaft hand wheel 19 sleeved on the power carbon belt shaft 14, a rewinding shaft hand wheel 20 sleeved on the rewinding carbon belt shaft 15, and a protection component for installing the driving componentBox 36A structural upper cover 29 mounted on the upper end of the structural frame 35 for shielding the carbon ribbon cartridge 2, and mounted on the knotA print head 6 provided at a lower end of the frame 35, and a head cover plate 33 for fixing the print head 6;

the printing base 1 comprises a rear inner cover 8, a slidable paper slot 10 arranged on the rear inner cover 8, a sensor support 11 arranged on the slidable paper slot 10, and a positioning sensor 12 arranged on the sensor support 11 and used for detecting the position of printing paper;

the positioning sensor 12 may be, but is not limited to, a photoelectric sensor.

The power carbon belt shaft 14 is provided with a carbon belt which is contacted with the lower end of the printing head 6 and is rewound by a rewinding carbon belt shaft 15, and the printing head 6 is used for driving the carbon belt to print the printing paper arranged in the slidable paper slot 10 by utilizing the heat-sensitive effect;

power carbon tape spool 14, carbon tape spool 15 of rolling back all are connected with structure frame 35 is detachable, structure frame 35 is equipped with and is used for fixed power carbon tape spool 14, carbon tape spool 15 of rolling back and installs the subassembly of dismantling in guard box 36.

As a preferred embodiment, as shown in fig. 10, the structural frame 35 is provided with a first mounting groove 37 and a second mounting groove 38 for mounting the power carbon belt shaft 14 and the rewinding carbon belt shaft 15, and the detachable components are mounted outside the first mounting groove 37 and the second mounting groove 38;

specifically, as shown in the figure, the detachable assembly includes a clasp structure 30 having two ends provided with hook portions 39 for locking the power carbon belt shaft 14 and the rewinding carbon belt shaft 15, and a baffle structure 31 mounted on the outer side of the clasp structure 30 for fixing the clasp structure 30;

the hook 39 is rotatably or resiliently connected to the clasp 30.

Wherein, clasp structure 30 and structure frame 35 realize fixedly through the fitting pin, clasp structure 30 is equipped with the mounting hole that is used for installing the fitting pin, and structure frame 35 is fixed with the fitting pin.

In other embodiments, the fastening pin may also be replaced with other fasteners.

As an alternative embodiment, as shown in fig. 7, the driving assembly includes a driving motor 16 mounted on the structural frame 35, a turbine 18 drivingly connected to an output shaft of the driving motor 16 and sleeved on the power carbon belt shaft 14;

optionally, the output shaft of the driving motor 16 is provided with an external thread for meshing connection with the turbine 18;

optionally, the driving motor 16 is connected with a worm 17, the worm 17 is used for realizing transmission with a worm wheel 18,

in the embodiment shown in fig. 7, the protection box 36 is provided with a plurality of switches 21 for controlling the driving motor 16 and an indicator lamp 22 for indicating the operation.

Specifically, the designer can set the indication effect of the indicator lamp 22 according to actual needs, such as power-on, start of printing, and the like.

As an alternative embodiment, as shown in fig. 8, the power carbon belt shaft 14 and the power shaft hand wheel 19 are fixedly connected through a clamping groove of the power shaft hand wheel 19, so as to achieve an effect of synchronous rotation, one end of the power shaft hand wheel 19, which is far away from the power carbon belt shaft 14, is provided with a cylindrical connecting portion, and the connecting portion is sequentially sleeved with a gasket 23, a turbine 18, a gasket 23, a pressure spring 24, a gasket 23, and a fixing screw 25, wherein the pressure spring 24 is used for obtaining a force towards the structural frame 35 when the power shaft hand wheel 19 is installed, so that the pressure spring keeps tightly attached to the structural frame 35, so as to achieve a better transmission effect.

In one possible embodiment, as shown in fig. 9, the rewind shaft hand wheel 20 is further connected with a limit clutch plate 28 rotating synchronously therewith, the limit clutch plate 28 is wound with a carbon ribbon tension spring 26, one end of the carbon ribbon tension spring 26 is fixed to the structural frame 35, the other end of the carbon ribbon tension spring 26 is fixed to the limit clutch plate 28, and the carbon ribbon tension spring 26 is used for pre-tightening the carbon ribbon when the carbon ribbon starts to work.

When the printer is started, the carbon tape tension spring 26 can temporarily prevent the carbon tape rewinding shaft 15 from rotating due to self elasticity, and at the moment, the carbon tape is tensioned due to the rotation of the carbon tape shaft 14, so that the phenomenon of poor printing effect is avoided.

In a preferred embodiment, when the printer needs to be ejected and reprinted, the user can pull the ribbon back by manually turning the rewind hand wheel 20.

Specifically, one end of the rewind shaft hand wheel 20 is provided with a columnar connecting part, and the connecting part is sequentially connected with a gasket 23, a spacing clutch plate 28 wound with a carbon tape tension spring 26, the gasket 23, a pressure spring 24, the gasket 23 and a fixing screw 25.

Wherein, the spacing clutch plate 28 is fixed with the carbon ribbon tension spring 26 through a tension spring fixing screw 27.

In one possible embodiment, as shown in fig. 3, a paper outlet 9 is connected to the printing base 1, and the paper outlet 9 is communicated with a slidable paper slot 10.

Specifically, the paper for printing is moved out in a predetermined direction by the paper outlet nozzle 9.

As a preferred embodiment, as shown in fig. 1, a rubber roller 5 for driving printing paper to move is disposed between the paper outlet 9 and the slidable paper slot 10 of the printing base 1.

The rubber roller 5 is driven by a motor positioned inside the printing base 1 to rotate so as to realize the moving and transmission of printing paper out of the paper outlet nozzle 9.

As a preferred embodiment, as shown in fig. 2, a fixed blade 34 and a movable blade 35 hinged to the fixed blade 34 and used for cutting printing paper are installed between the front inner cover 44 of the printing base 1 and the paper output nozzle 9; the movable blade 35 is equipped with rotatory sliding tray 41, bellying 42 is installed to rotatory sliding tray 41, bellying 42 is connected with and installs in the inside cam of printing base 1, print the inside motor 43 that still installs of base 1, motor 43 is connected with cam drive, thereby motor 43 is used for driving cam rotation to drive movable blade 35 and rotates, and then reaches the effect that the cutting was beaten printing paper and was printed the admission ticket.

Specifically, the user can design the cam structure as desired, which is not described herein.

The fixed blade 34 functions as a cutting platform, and when the movable blade 35 is driven to rotate, the fixed blade 34 is used as a stress point to cut the printing paper.

In one possible embodiment, as shown in fig. 3 and 5, paper discharge sensors 13 for detecting whether there is printing paper are disposed at positions between the printing base 1 and the paper discharge nozzles 9, and the number of the paper discharge sensors 13 is at least 2, and the paper discharge sensors are respectively disposed at positions above the paper discharge nozzles 9 and at positions below the paper discharge nozzles 9.

The paper output sensor 13 may be, but not limited to, a photo sensor, and when the two photo sensors receive signals of each other, the paper output is considered to have no printing paper. The printing of the next ticket can be performed according to a program set by the user.

In one possible embodiment, as shown in fig. 1, a hinge shaft 3 is provided between the printing base 1 and the printing component for connecting the two.

Specifically, the user can separate the printing component from the printing base by using the hinge shaft 3, so as to facilitate installation and maintenance.

In a possible embodiment, the printing element is provided with a fixing pin 4, and the printing base 1 is provided with a locking head 7 which is detachably connected with the fixing pin 4 by a button.

Wherein, the user accessible presses the button of tapered end 7, realizes the unblock of printing part and printing base 1 to can make printing part and printing base 1 take place to rotate.

In one possible embodiment, as shown in fig. 6, the structural frame 35 is provided with a plurality of sensors (not shown, but not limited to, photoelectric sensors) for detecting whether the power shaft hand wheel 19 and the rewind shaft hand wheel 20 rotate, the structural frame 35 is provided with a plurality of through holes 40 for installing the sensors, and one ends of the power shaft hand wheel 19 and the rewind shaft hand wheel 20 close to the structural frame 35 are provided with a plurality of contrast slots 45 (see fig. 8 for example in particular) opposite to the through holes 40.

In the embodiment shown in fig. 10, the print head 6 is fixed to the lower end of the print base 1 by a head positioning shaft 32.

In the embodiment shown in fig. 10, the printhead cover 33 is connected to the printing base 1 by the printhead pressure adjusting screw 34, and the user can change the position of the printhead 6 and detach the printhead from the printing base by the printhead pressure adjusting screw 34.

To sum up, adopt the thermal printer of this scheme, the problem of non-thermal paper side ability realization printing has been overcome, can implement to print on ordinary paper, the production and operation of enterprise have brought economic advantage, simultaneously because this scheme has detachable power carbon tape spool, carbon tape spool and the removable assembly of backrush, convenient to detach installation is maintained, in addition, set up and to detect out the entrance ticket that whether the paper mouth exists the printing effectively in the sensor of paper outlet nozzle, set up in the sensor in slidable paper groove, set up and to realize detecting the paper and also moving in the sensor of structure frame side, whether power carbon tape spool and carbon tape spool of backrush rotate, so that judge whether the printer normally works.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims

1. A novel thermal printer with a carbon ribbon is characterized by comprising a printing base and a printing component which is arranged at the upper end of the printing base and is provided with a carbon ribbon bin;

2. The novel thermal printer of the carbon ribbon as claimed in claim 1, wherein the structural frame is provided with a first mounting groove and a second mounting groove for mounting the power carbon ribbon shaft and the rewinding carbon ribbon shaft, and the detachable component is mounted outside the first mounting groove and the second mounting groove;

3. The novel thermal ribbon printer as claimed in claim 1, wherein the driving assembly comprises a driving motor mounted on the structural frame, a turbine connected with an output shaft of the driving motor in a transmission manner and sleeved on the power carbon ribbon shaft;

4. The novel thermal printer for the carbon ribbon as claimed in claim 1, wherein the hand wheel of the rewinding shaft is further connected with a limiting clutch plate rotating synchronously with the hand wheel, the limiting clutch plate is wound with a carbon ribbon tension spring, one end of the carbon ribbon tension spring is fixed on the structural frame, the other end of the carbon ribbon tension spring is fixed on the limiting clutch plate, and the carbon ribbon tension spring is used for pre-tightening the carbon ribbon when the carbon ribbon starts to work.

5. The new thermal ribbon printer as defined in claim 1 wherein a paper outlet nozzle is connected to the print base, the paper outlet nozzle communicating with the slidable paper slot.

6. The novel thermal ribbon printer as claimed in claim 5, wherein a rubber roller for driving the printing paper to move is arranged between the paper outlet nozzle and the slidable paper slot on the printing base.

7. The novel carbon ribbon thermal printer according to claim 6, wherein a fixed blade and a movable blade hinged with the fixed blade and used for cutting printing paper are arranged between the front inner cover of the printing base and the paper outlet nozzle; the movable blade is provided with a rotary sliding groove, the rotary sliding groove is provided with a protruding part, the protruding part is connected with a cam installed inside the printing base, a motor is further installed inside the printing base and is connected with the cam in a transmission mode, and the motor is used for driving the cam to rotate so as to drive the movable blade to rotate.

8. The novel thermal ribbon printer according to claim 5, wherein a paper output sensor for detecting whether printing paper exists is arranged at a position between the printing base and the paper output nozzle, and the number of the paper output sensors is at least 2, and the paper output sensors are respectively distributed at a position above the paper output nozzle and a position below the paper output nozzle.

9. The novel thermal printer of claim 1, wherein a hinge shaft for connecting the printing base and the printing component is arranged between the printing base and the printing component, the printing component is provided with a fixing pin, and the printing base is provided with a locking head which is detachably connected with the fixing pin through a button.

10. The thermal printer of claim 1, wherein the frame is provided with a plurality of sensors for detecting rotation of the power shaft handwheel and the rewind shaft handwheel, the frame is provided with a plurality of through holes for mounting the sensors, and the ends of the power shaft handwheel and the rewind shaft handwheel close to the frame are provided with a plurality of contrast grooves opposite to the through holes.