CN212860840U

CN212860840U - Thermal transfer printer

Info

Publication number: CN212860840U
Application number: CN202021260343.9U
Authority: CN
Inventors: 不公告发明人
Original assignee: Xiamen Hanyin Electronic Technology Co Ltd
Current assignee: Xiamen Hanyin Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-02
Anticipated expiration: 2030-06-30

Abstract

The utility model relates to the technical field of printers, in particular to a thermal transfer printer, which comprises a printing head mechanism, a switching mechanism, a carbon ribbon mechanism, a retainer, a first driving component and a differential component, wherein the printing head mechanism comprises a printing head and a printing rubber roller, the printing head is provided with a printing position which is in tangent fit with the printing rubber roller and a separation position which is separated from the printing rubber roller, and the switching mechanism can enable the printing head to be switched between the printing position and the separation position; the first driving assembly is in selective transmission connection with the first recovery roller of the carbon ribbon mechanism, the stopper can brake or brake the first release roller of the carbon ribbon mechanism, after printing of the content on the printing medium is finished, the switching mechanism enables the printing head to move to the separation position, the differential piece enables the first driving assembly to slip relative to the first recovery roller, the stopper brakes the first release roller, the first release roller cannot rotate, the carbon ribbon keeps static, the printing medium can be conveyed normally, and therefore waste of the carbon ribbon can be avoided.

Description

Thermal transfer printer

Technical Field

The utility model relates to a printer technical field especially relates to a thermal transfer printer.

Background

When a thermal transfer printer in the prior art works, a thermal transfer ribbon and a printing medium pass through a space between a printing head and a printing rubber roller at the same time, ink on the thermal transfer ribbon is usually transferred onto the printing medium by heating the printing head, and the printing rubber roller is driven by a driving mechanism to rotate so as to move the thermal transfer ribbon and the printing medium downstream along with the printing rubber roller at the same linear velocity. In general, the print head is pressed against the printing rubber roller by spring pressure, a partial area is usually reserved between two adjacent printing media without printing, and the printing content on a single printing medium does not need to be covered with the whole printing medium, which results in waste of the carbon ribbon due to synchronous movement of the carbon ribbon and the printing medium in the area without printing content.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: a thermal transfer printer is provided to save a thermal transfer ribbon.

The utility model provides a thermal transfer printer, this thermal transfer printer includes:

the printing head mechanism comprises a printing head and a printing rubber roller, the printing head is provided with a printing position in tangent fit with the printing rubber roller and a separation position separated from the printing rubber roller, and a printing medium and a carbon ribbon can penetrate through the printing head and the printing rubber roller;

a switching mechanism capable of driving the print head to switch between the printing position and the separation position;

the carbon ribbon mechanism comprises a first releasing roller used for releasing the carbon ribbon and a first recovery roller used for rolling the carbon ribbon;

a stopper capable of braking or releasing the braking of the first payout roller;

the printing device comprises a first driving assembly and a differential piece, wherein the differential piece is arranged between the first recovery roller and the first driving assembly, the differential piece is configured to enable the first driving assembly and the first recovery roller to be in transmission connection or to enable the first driving assembly and the first recovery roller to slip relatively, when the printing head is in the printing position, the stopper releases the brake of the first releasing roller, and the differential piece enables the first driving assembly and the first recovery roller to be in transmission connection; when the printing head is at the separation position, the stopper brakes the first releasing roller, and the differential piece enables the first driving assembly and the first recovery roller to slip relatively.

As a preferred technical scheme of the thermal transfer printer, the printing head mechanism comprises a housing which can rotate relative to the printing rubber roller, and the printing head is arranged in the housing;

the switching mechanism comprises a cam and a second driving assembly in transmission connection with the cam, and the cam can drive the housing to rotate around the printing rubber roller so as to enable the printing head to be switched from the printing position to the separation position.

In a preferred embodiment of the thermal transfer printer, the print head mechanism includes a roller rotatably connected to the housing, and an outer peripheral surface of the cam abuts against an outer peripheral surface of the roller.

As a preferred technical solution of the thermal transfer printer, the print head mechanism includes an elastic component, and the elastic component abuts against the housing and can drive the housing to rotate around the printing rubber roller, so that the print head is switched from the separation position to the printing position.

As the preferred technical scheme of the thermal transfer printer, the second driving assembly comprises a driving motor and a rotating shaft in transmission connection with the driving motor, two cams are arranged on the rotating shaft, and the two cams can drive the housing to rotate around the printing rubber roller.

As the preferred technical scheme of thermal transfer printer, thermal transfer printer including set up in sensor in thermal transfer printer's the frame, and set up in epaxial detection piece rotates, works as it is located to beat printer head when the isolated position, the sensor in detect the cooperation of piece, works as it is located to beat printer head when the printing position, the sensor in detect a separation.

As a preferable aspect of the thermal transfer printer, the thermal transfer printer includes a printing medium mechanism including a second discharge roller for discharging a printing medium.

As a preferred technical solution of the thermal transfer printer, the printing medium is label paper, and the label paper comprises a base paper and a plurality of labels arranged at equal intervals along the length direction of the base paper;

the printing medium mechanism comprises a second recovery roller, the first driving assembly is in transmission connection with the second recovery roller, the label and the base paper can be separated after passing through the printing head mechanism, and the second recovery roller is used for guiding the base paper to be conveyed along a set path.

As the preferred technical scheme of thermal transfer printer, the thermal transfer printer includes the separation plate, the separation plate set up in the output side of beating printer head mechanism, beat printer head mechanism can with label paper is carried extremely along the first direction the separation plate, the bottom paper is walked around the separation plate, just the second is retrieved the roller and can be driven the bottom paper is kept away from along the second direction the separation plate, the first direction with contained angle between the second direction is the obtuse angle.

As a preferred technical solution of the thermal transfer printer, the printing medium mechanism includes a pressing assembly, the pressing assembly includes a pressing shaft rotatably connected to a frame of the thermal transfer printer, a link rod disposed on the pressing shaft, and a pressing roller rotatably disposed on the link rod, the pressing roller can abut against the second recovery roller, and the base paper passes through between the second recovery roller and the pressing roller.

The utility model has the advantages that:

the utility model provides a thermal transfer printer, this thermal transfer printer beat printer head mechanism, switching mechanism, carbon ribbon mechanism, clog, a drive assembly and difference piece including. The printing head mechanism comprises a printing head and a printing rubber roller, the printing head is provided with a printing position in tangent fit with the printing rubber roller and a separation position separated from the printing rubber roller, and the switching mechanism can drive the printing head to switch between the printing position and the separation position; the stopper can brake or release the brake of the first releasing roller of the carbon ribbon mechanism; the differential piece is arranged between the first recovery roller and the first driving assembly of the carbon belt mechanism, and the differential piece is configured to enable the first driving assembly and the first recovery roller to be in transmission connection or to slip relatively. When the printing content on the printing medium is printed but the printing medium is not fully distributed, the printing head can be switched to the separation position from the printing position through the switching mechanism, the differential piece enables the first driving assembly and the first recovery roller to be connected in a relatively slipping mode, the first releasing roller is braked by the stopper, the first driving assembly slips relative to the first recovery roller at the moment, the stopper holds the first releasing roller tightly, the carbon ribbon is kept static, the printing medium can be conveyed normally, and therefore waste of the carbon ribbon can be avoided.

Drawings

FIG. 1 is a front view of a thermal transfer printer according to an embodiment of the present invention;

FIG. 2 is a rear view of a thermal transfer printer according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a thermal transfer printer according to an embodiment of the present invention;

fig. 4 is a sectional view of a partial structure of a thermal transfer printer according to an embodiment of the present invention.

In the figure:

1. a print head mechanism; 11. a print head; 12. printing a rubber roller; 13. a housing; 14. an elastic component; 141. a support bar; 142. a base; 143. a pressure head; 144. a pressure spring; 15. a roller;

21. a cam; 22. a second drive assembly; 221. a rotating shaft; 222. a drive motor; 223. a third driven wheel; 224. a third belt;

3. a carbon ribbon mechanism; 31. a first payout roller; 32. a first recovery roll;

4. a first drive assembly; 41. a first motor; 42. a first drive belt; 43. a second driven wheel; 44. a second belt; 45. an idler pulley; 46. a fourth driven wheel; 47. a fourth belt;

5. a differential member;

6. a stopper;

7. a print medium mechanism; 71. a second launch roller; 72. a second recovery roller; 73. a compression assembly; 731. a pressing shaft; 732. a connecting rod; 733. a pressure roller;

8. a sensor;

9. a detection member;

10. a separation plate;

20. a frame;

100. a print medium; 101. base paper; 102. a label;

200. a carbon ribbon.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means 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 of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 to 4, the present embodiment provides a thermal transfer printer including a head mechanism 1, a switching mechanism, a ribbon mechanism 3, a stopper 6, a first drive assembly 4, and a differential 5.

The printing head mechanism 1 comprises a printing head 11 and a printing rubber roller 12, the printing head 11 is provided with a printing position matched with the printing rubber roller 12 in a tangent mode and a separation position separated from the printing rubber roller 12, and the printing head 11 can be driven to switch between the printing position and the separation position through a switching mechanism. The printing medium 100 and the carbon ribbon 200 can pass through between the printing head 11 and the printing rubber roller 12, when the printing head 11 is in a printing position, the coating surface of the carbon ribbon 200 is in contact with the surface of the printing medium 100, the non-coating surface of the carbon ribbon 200 is in contact with the printing head 11, and the ink coating on the carbon ribbon 200 can be transferred onto the printing medium 100 by heating the printing head 11; when the print head 11 is in the separation position, the print head 11 can be separated from the non-coated surface of the carbon ribbon 200, and the carbon ribbon 200 is not used.

The carbon tape mechanism 3 includes a first release roller 31 and a first recovery roller 32 on both sides of the print head mechanism 1, the first release roller 31 is used for releasing the carbon tape 200, and the first recovery roller 32 is used for winding the carbon tape 200. Wherein, the stopper 6 can brake or release the first releasing roller 31, and the first driving assembly 4 can selectively drive the first recovering roller 32 to rotate. The stopper 6 is prior art and will not be described herein. In this embodiment, the differential element 5 is disposed between the first recovery roller 32 and the first driving assembly 4, and the differential element 5 is configured to enable the first driving assembly 4 and the first recovery roller 32 to be in transmission connection or to slip relatively. Specifically, referring to fig. 2, the first driving assembly 4 includes a first motor 41, a first driving wheel (not shown in the drawing) disposed on an output shaft of the first motor 41, a first driven wheel (not shown in the drawing) disposed on a one-way bearing, and a first driving belt 42 supported on the first driven wheel and the first driving wheel. In other embodiments, the differential member 5 achieves a driving connection or relative slip between the first drive assembly 4 and the first recovery roller 32 via a driving friction plate and a driven friction plate. The driving friction plate is connected with the first driven wheel, the driven friction plate is connected with the first recovery roller 32, when the driving friction plate is attached to the end face of the driven friction plate, the first driven wheel is in transmission connection with the first recovery roller 32, and when the driving friction plate is separated from the end face of the driven friction plate, the first driven wheel is disconnected with the first recovery roller 32. In other embodiments, the differential 5 may be a one-way bearing, an electromagnetic clutch, or the like.

When the print head 11 is at the printing position, the differential 5 can be used to drive the first driving assembly 4 to connect with the first recovery roller 32 and the stopper 6 can be used to release the brake of the first releasing roller 31, the thermal transfer printer can move the carbon ribbon 200 and the printing medium 100 at the same linear velocity, the print head 11 can print the coating on the carbon ribbon 200 on the printing medium 100, the carbon ribbon 200 is used, the first releasing roller 31 releases the carbon ribbon 200, and the used carbon ribbon 200 can be reeled up on the first recovery roller 32 under the driving of the first driving assembly 4. When the printing content on the printing medium 100 is printed and the printing medium 100 is not full, the printing head 11 can be switched from the printing position to the separation position by the switching mechanism, so that the differential member 5 slides the first driving assembly 4 and the first recovery roller 32 relatively, and the stopper 6 brakes the first release roller 31, at this time, the first driving assembly 4 slides relative to the first recovery roller 32, the stopper 6 holds the first release roller 31 tightly, the carbon ribbon 200 is kept static, and the printing medium 100 can be normally conveyed, thereby avoiding waste of the carbon ribbon 200.

In order to facilitate the printing medium 100 and the carbon ribbon 200 to be smoothly input into the print head mechanism 1 and smoothly output from the print head mechanism 1, in this embodiment, the printing roller 12 may be driven to rotate by the first driving assembly 4. Specifically, referring to fig. 2, the first driving assembly 4 includes a second driven wheel 43 disposed on the printing roller 12, and a second transmission belt 44 supported on the first driving wheel and the second driven wheel 43, and the printing roller 12 can be driven to rotate by the second transmission belt 44. And the first motor 41 drives the printing rubber roller 12 and the first recovery roller 32 to rotate at the same time, so that the cost can be effectively reduced. Of course, in other embodiments, the printing roller 12 can be directly driven to rotate by the motor.

This thermal transfer printer includes frame 20, and it all sets up in frame 20 to beat printer head mechanism 1, switching mechanism, carbon ribbon mechanism 3, first drive assembly 4, specifically, beats printer head 11 and frame 20 swing joint, and printing rubber roll 12, first releasing roll 31 and first recovery roller 32 all rotate with frame 20 to be connected, and first motor 41 is fixed in frame 20. Preferably, the frame 20 has a first side and a second side opposite to each other, the print head mechanism 1, the switching mechanism and the thermal transfer ribbon mechanism 3 are located on the first side of the frame 20, and the first driving assembly 4 is located on the second side of the frame 20, so that the assembly is convenient, and the overall structure of the thermal transfer printer can be more compact.

Optionally, referring to fig. 1, 3 and 4, the print head mechanism 1 includes a housing 13 capable of rotating relative to the printing roller 12, and the print head 11 is disposed in the housing 13; the switching mechanism comprises a cam 21 and a second driving assembly 22 in transmission connection with the cam 21, and the cam 21 can drive the housing 13 to rotate around the printing rubber roller 12 so as to switch the printing head 11 from the printing position to the separation position. This embodiment is through making cam 21 direct drive housing 13 rotate, and then drives and beat printer head 11 and rotate, need not to set up other parts between cam 21 and the housing 13, and the structure is retrencied, and the space occupies for a short time, is favorable to making the inner space of thermal transfer printer compacter. And the housing 13 is in running fit with the rubber roller 12, so that the structure is more compact. Of course, in other embodiments, the frame 20 may be provided with a pivot, and the cover 13 is pivotally connected to the pivot. Preferably, the print head mechanism 1 includes a roller 15 rotatably attached to the housing 13, and the outer peripheral surface of the cam 21 abuts against the outer peripheral surface of the roller 15. By providing the roller 15, rolling friction between the cam 21 and the roller 15 facilitates driving the housing 13 and the print head 11 to rotate integrally by the cam 21. In other embodiments, the switching mechanism may also be replaced by an air cylinder or an electric push rod, the housing 13 is pivotally connected to the printing roller 12, and the air cylinder or the electric push rod pushes the housing 13 to rotate relative to the printing roller 12 so that the print head 11 can move from the printing position to the separation position.

Optionally, referring to fig. 2 and 4, in this embodiment, the second driving assembly 22 includes a driving motor 222, and a rotating shaft 221 in transmission connection with the driving motor 222, where two cams 21 are disposed on the rotating shaft 221, and the two cams 21 can simultaneously drive the housing 13 to rotate around the printing roller 12. So arranged, the housing 13 is conveniently ensured to rotate stably. Specifically, the second driving assembly 22 includes a second driving wheel (not shown in the drawings) disposed on the output shaft of the driving motor 222, a third driven wheel 223 disposed on the rotating shaft 221, and a third transmission belt 224 supported on the second driving wheel and the third driven wheel 223, when the driving motor 222 rotates, the third transmission belt 224 drives the rotating shaft 221 to rotate, and then the two cams 21 can drive the housing 13 to rotate at the same time.

Alternatively, with continued reference to fig. 2, the thermal transfer printer includes a sensor 8 disposed on the frame 20 of the thermal transfer printer, and a detecting member 9 disposed on the rotating shaft 221, wherein the sensor 8 cooperates with the detecting member 9 when the print head 11 is located at the separation position, and the sensor 8 separates from the detecting member 9 when the print head 11 is located at the printing position. In this embodiment, the rotating shaft 221 can drive the detecting member 9 to rotate, and the sensor 8 is located on a rotating path of the detecting member 9. Specifically, the sensor 8 is a photoelectric sensor, the photoelectric sensor includes a light receiving end and a light emitting end which are arranged at an interval and opposite to each other, the light receiving end can receive a light signal emitted by the light emitting end, when the detecting member 9 is located between the light receiving end and the light emitting end, the detecting member 9 shields the light signal, so that the light receiving end cannot receive the light signal emitted by the light emitting end, at this time, the cam 21 lifts the housing 13 to the highest position, and the printing head 11 is located at the separation position, the sensor 8 can emit a first detection signal to the controller; when the detecting member 9 is separated from between the light receiving end and the light emitting end, the light receiving end can receive the light signal emitted from the light emitting end, at this time, the base circle portion of the cam 21 abuts against the roller 15, the printing head 11 is located at the printing position under the action of the elastic component 14, and the sensor 8 can emit a second detecting signal to the controller.

Optionally, with continued reference to fig. 1, fig. 3, and fig. 4, the print head mechanism 1 includes an elastic component 14, and the elastic component 14 abuts against the casing 13 and can drive the casing 13 to rotate around the printing rubber roller 12, so as to switch the print head 11 from the separation position to the printing position. Through setting up elastic component 14, can make printer head 11 have the motion trend that is close to with printing rubber roll 12 all the time, can make printer head 11 self return to the printing position on the one hand, on the other hand is at the printing in-process, still can guarantee the printing effect. Specifically, the elastic assembly 14 includes a supporting rod 141 mounted on the frame 20, a base 142 fixed on the supporting rod 141, a pressing head 143 slidably engaged with the base 142, and a pressing spring 144 sleeved on the pressing head 143 and respectively abutting against the base 142 and the pressing head 143, where the pressing spring 144 is in a compressed state, and the pressing spring 144 can drive the pressing head 143 to extend relative to the base 142 and press the housing 13 to rotate downward, so as to move the print head 11 to the printing position. It will be appreciated that when the switch mechanism moves the printhead 11 to the disengaged position, the housing 13 urges the ram 143 to retract relative to the base 142 and the compression spring 144 to be compressed.

Alternatively, the thermal transfer printer includes a printing medium mechanism 7, and the printing medium mechanism 7 includes a second dispensing roller 71 for dispensing the printing medium 100. The printing medium 100 may be released and transported into the print head mechanism 1 by the printing medium 100 structure. In the present embodiment, the printing medium 100 is a label sheet including a base sheet 101 and a plurality of labels 102 disposed at equal intervals along the length direction of the base sheet 101; a gap is formed between two adjacent labels 102, which may cause the printing medium 100 to undulate, and may cause the printing head 11 to be worn seriously when the printing head 11 is located at a printing position. In the thermal transfer printer provided in this embodiment, after printing the content on the label 102, the print head 11 can move to the separation position, so that the print head 11 can be separated from the label 102, and the gap between adjacent labels 102 does not affect the print head 11, thereby prolonging the service life of the print head 11. In other embodiments, the printing medium 100 may also be a ticket, an invoice, or the like, and the printing medium mechanism 7 may also be omitted as necessary.

Optionally, the print medium mechanism 7 includes a second recovery roller 72, the first driving assembly 4 is in driving connection with the second recovery roller 72, the label 102 and the base paper 101 can be separated after passing through the print head mechanism 1, and the second recovery roller 72 is used for guiding the base paper 101 to be conveyed along the set path. Specifically, the first driving assembly 4 includes an idler pulley 45 disposed on the printing roller 12, a fourth driven pulley 46 disposed on the second recovery roller 72, and a fourth transmission belt 47 supported on the idler pulley 45 and the fourth driven pulley 46, so that the first recovery roller 32, the printing roller 12, and the second recovery roller 72 are driven to rotate by the first motor 41, the structure is simplified, the cost is low, and the saving of the internal space of the thermal transfer printer is facilitated.

Preferably, the printing medium mechanism 7 comprises a pressing assembly 73, the pressing assembly 73 comprises a pressing shaft 731 rotatably connected with the frame 20 of the thermal transfer printer, a connecting rod 732 arranged on the pressing shaft 731, and a pressing roller 733 rotatably arranged on the connecting rod 732, the base paper 101 passes through between the second recovery roller 72 and the pressing roller 733, the pressing roller 733 and the second recovery roller 72 can be separated or matched in a tangent mode by rotating the connecting rod 732, and when the pressing roller 733 and the second recovery roller 72 are matched in the tangent mode, the base paper 101 can be conveyed to the downstream continuously under the driving of the second recovery roller 72. When the pinch roller 733 is separated from the second recovery roller 72, the printing medium 100 may be replaced. The base paper 101 is pressed against the second recovery roller 72 by the pressing assembly 73, and the base paper 101 and the second recovery roller 72 move synchronously, so that the travel stroke of the base paper 101, namely the printed length of the label paper can be calculated according to the basic variable of the linear speed of the second recovery roller 72 and the running time of the second recovery roller 72.

Optionally, the thermal transfer printer includes a separating plate 10, the separating plate 10 is disposed on an output side of the print head mechanism 1, the printing rubber roller 12 of the print head mechanism 1 can convey the label paper to the separating plate 10 along a first direction, the base paper 101 bypasses the separating plate 10, and the base paper 101 is driven by the second recovery roller 72 to be away from the separating plate 10 along a second direction, and an included angle between the first direction and the second direction is an obtuse angle. It will be appreciated that the label 102 has a stiffness such that one side of the label 102 is separated from the base paper 101 and automatically peeled off, so that the operator can directly remove the label 102, thereby improving the working efficiency.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A thermal transfer printer, comprising:

the printing head mechanism (1) comprises a printing head (11) and a printing rubber roller (12), the printing head (11) is provided with a printing position matched with the printing rubber roller (12) in a tangent mode and a separation position separated from the printing rubber roller (12), and a printing medium (100) and a carbon ribbon (200) can penetrate through the space between the printing head (11) and the printing rubber roller (12);

a switching mechanism capable of driving the print head (11) to switch between the printing position and the separation position;

a carbon tape mechanism (3) including a first dispensing roller (31) for dispensing the carbon tape (200) and a first recovery roller (32) for taking up the carbon tape (200);

a stopper (6) capable of braking or releasing the braking of the first payout roller (31);

a first drive assembly (4) and a differential (5), the differential (5) being disposed between the first recovery roller (32) and the first drive assembly (4), the differential (5) being configured to cause a driving connection or relative slippage between the first drive assembly (4) and the first recovery roller (32), the brake (6) releasing the first launch roller (31) when the print head (11) is in the print position, and the differential (5) causing a driving connection between the first drive assembly (4) and the first recovery roller (32); when the printing head (11) is in the separation position, the stopper (6) brakes the first launch roller (31), and the differential member (5) causes relative slip between the first drive assembly (4) and the first recovery roller (32).

2. The thermal transfer printer according to claim 1, characterised in that the print head mechanism (1) comprises a casing (13) rotatable with respect to the printing roller (12), the print head (11) being arranged inside the casing (13);

the switching mechanism comprises a cam (21) and a second driving assembly (22) in transmission connection with the cam (21), and the cam (21) can drive the casing (13) to rotate around the printing rubber roller (12) so as to enable the printing head (11) to be switched from the printing position to the separation position.

3. The thermal transfer printer according to claim 2, wherein the print head mechanism (1) comprises a roller (15) rotatably attached to the housing (13), and an outer circumferential surface of the cam (21) abuts against an outer circumferential surface of the roller (15).

4. The thermal transfer printer according to claim 2, characterised in that the print head mechanism (1) comprises an elastic assembly (14), the elastic assembly (14) being in abutment with the casing (13) and being able to drive the casing (13) in rotation about the printing roller (12) so as to switch the print head (11) from the detached position to the printing position.

5. The thermal transfer printer according to claim 2, wherein the second driving assembly (22) comprises a driving motor (222) and a rotating shaft (221) in transmission connection with the driving motor (222), two cams (21) are arranged on the rotating shaft (221), and the two cams (21) can simultaneously drive the casing (13) to rotate around the printing rubber roller (12).

6. The thermal transfer printer according to claim 5, characterized in that it comprises a sensor (8) arranged on a frame (20) of the thermal transfer printer, and a detection member (9) arranged on the rotary shaft (221), the sensor (8) cooperating with the detection member (9) when the print head (11) is in the separation position, the sensor (8) being separated from the detection member (9) when the print head (11) is in the printing position.

7. The thermal transfer printer according to claim 1, characterized in that it comprises a print media mechanism (7), said print media mechanism (7) comprising a second dispensing roller (71) for dispensing a print media (100).

8. The thermal transfer printer according to claim 7, wherein the printing medium (100) is a label sheet including a base sheet (101) and a plurality of labels (102) provided at equal intervals in a length direction of the base sheet (101);

the printing medium mechanism (7) comprises a second recovery roller (72), the first driving assembly (4) is in transmission connection with the second recovery roller (72), the label (102) and the base paper (101) can be separated after passing through the printing head mechanism (1), and the second recovery roller (72) is used for guiding the base paper (101) to be conveyed along a set path.

9. The thermal transfer printer of claim 8, comprising a separator plate (10), the separator plate (10) being disposed on an output side of the print head mechanism (1), the print head mechanism (1) being capable of transporting the label paper to the separator plate (10) in a first direction, the liner (101) bypassing the separator plate (10), and the second recovery roller (72) being capable of driving the liner (101) away from the separator plate (10) in a second direction, an included angle between the first direction and the second direction being an obtuse angle.

10. The thermal transfer printer according to claim 8, wherein the printing medium mechanism (7) includes a pressing member (73), the pressing member (73) includes a pressing shaft (731) rotatably connected to a frame (20) of the thermal transfer printer, a link (732) provided on the pressing shaft (731), a pressing roller (733) rotatably provided on the link (732), the pressing roller (733) is capable of abutting against the second recovery roller (72), and the base paper (101) passes between the second recovery roller (72) and the pressing roller (733).