CN107310285B

CN107310285B - Thermal transfer printer

Info

Publication number: CN107310285B
Application number: CN201710127873.2A
Authority: CN
Inventors: 陈激; 赵运翔
Original assignee: Shanghai Guao Electronic Technology Co Ltd
Current assignee: Shanghai Guao Electronic Technology Co Ltd
Priority date: 2017-03-06
Filing date: 2017-03-06
Publication date: 2023-04-28
Anticipated expiration: 2037-03-06
Also published as: CN107310285A

Abstract

The invention discloses a thermal transfer printer, comprising: the rack comprises a control box and a carbon ribbon box, wherein the carbon ribbon box is arranged above the control box, a partition plate is arranged between the control box and the carbon ribbon box, and the upper side of the carbon ribbon box is of an open structure; the frame cover plate is hinged with the upper side of the carbon ribbon box, and is covered with the frame; the locking mechanism comprises a locking shaft part and a locking part, the locking shaft part is connected with the frame, the locking part is connected with the frame cover plate, and the locking part is matched with the locking shaft part; the two ink ribbon tensioning mechanisms are arranged in the carbon ribbon box and are respectively arranged on two sides of the partition plate, and the two ink ribbon tensioning mechanisms are opposite to each other; the printing mechanism is arranged inside the control box. The invention can tension the carbon belt, and can maintain a certain tension force, so that the tension force of the paper belt is controlled in a reasonable range. The locking mechanism can rapidly open and lock the shell of the printer, and is convenient for replacing the carbon belt.

Description

Thermal transfer printer

Technical Field

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

Background

Many labels are required to withstand time, even if the labels are stored in a solvent or at a higher temperature, the labels are not deformed for a long time, characters are not discolored, the characteristics cannot be guaranteed by common ink-jet printing technology and laser printing, and the characteristics of the labels can be achieved by thermal transfer technology, so that the thermal transfer technology is widely applied. The thermal transfer printer is a printer that heats a carbon tape by a thermal print head to transfer a coating material of the carbon tape onto a printing medium to form an image or a character. Therefore, the carbon ribbon of the thermal transfer printer has a relatively frequent replacement requirement, and the thermal transfer printer needs to be opened to be installed inside the thermal transfer printer, so that the thermal transfer printer is generally provided with a relatively convenient opening and closing mechanism and a locking structure. In addition, the carbon tape needs to be tensioned when the thermal transfer printer performs printing to transfer the coating of the carbon tape onto the printing medium, and thus a tensioning device suitable for the thermal transfer printer is required.

Disclosure of Invention

In view of the above-described problems, an object of the present invention is to provide a thermal transfer printer.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

a thermal transfer printer, comprising: the machine frame comprises a control box and a carbon ribbon box, wherein the carbon ribbon box is arranged above the control box, a partition plate is arranged between the control box and the carbon ribbon box, and the upper side of the carbon ribbon box is of an open structure; the frame cover plate is hinged with the upper side of the carbon ribbon box and is covered with the frame; the locking mechanism comprises a locking shaft part and a locking part, the locking shaft part is connected with the frame, the locking part is connected with the frame cover plate, and the locking part is matched with the locking shaft part; the two ink ribbon tensioning mechanisms are arranged in the carbon ribbon box and are respectively arranged on two sides of the partition board, and the two ink ribbon tensioning mechanisms are opposite to each other; and the printing mechanism is arranged in the control box.

The thermal transfer printer described above, wherein the locking mechanism includes: the lock shaft base is of a hollow cylindrical structure, and an annular boss is formed in the middle of the inside of the lock shaft base; the lock shaft is positioned in the lock shaft base, penetrates through the annular boss, a clamping block is arranged at one end of the lock shaft, and a spring is arranged between the clamping block and the annular boss; the lock comprises a lock cylinder, wherein one end of the lock cylinder is fixedly connected with the other end of the lock shaft, a pin is arranged at the other end of the lock cylinder, the pin is fixedly connected with the lock cylinder, and the pin penetrates through the lock cylinder; the latch portion includes: the fixing plate is provided with a special-shaped hole, and the two sides of the special-shaped hole are provided with rectangular circles; the knob is fixedly connected with the fixing plate, a hollow structure is arranged in the knob, and the hollow structure is communicated with the special-shaped hole.

The thermal transfer printer comprises a lock shaft base, a lock pin, a positioning pin, a clamping block, a positioning hole and a waist-shaped hole, wherein the side face of the lock shaft base is provided with a penetrating positioning hole, the positioning hole is located on the other side of the lock shaft base opposite to the clamping block, the positioning hole is a waist-shaped hole, the middle of the lock cylinder is fixedly provided with the positioning pin, and the positioning pin is arranged in the positioning hole.

The thermal transfer printer described above, further comprising: the outer edge of the fixing plate is also provided with the lock catch limiting plate, the lock catch limiting plate is arc-shaped, and the lock catch limiting plate is also provided with a groove; the cover plate limiting plate is fixedly connected with the frame, the cover plate limiting plate is arc-shaped, the cover plate limiting plate is further provided with a protrusion, the protrusion abuts against the lock catch limiting plate, and the protrusion is matched with the groove.

The thermal transfer printer comprises a rotary knob, a fixing plate, a rack cover plate, a locking part and a locking part, wherein the rotary knob is arranged on the rack cover plate, the fixing plate is arranged on the rack cover plate, the locking part is arranged on the rack cover plate, and the locking part is arranged on the rack cover plate.

The thermal transfer printer described above, wherein each of the ribbon take-up mechanisms includes: the bracket is fixedly connected with one side of the partition plate; the rotary positioning plate is rotatably connected with the bracket through a positioning plate rotating shaft; one end of a motor shaft of the motor is fixedly connected with the rotary positioning plate; one end of the first rotating shaft is fixedly connected with the other end of the motor shaft; the two sides of the first rotating shaft are respectively provided with a rotating shaft bracket, and the rotating shaft brackets are fixedly connected with the first rotating shaft; the second rotating shaft is fixedly connected with the other sides of the two rotating shaft brackets relative to the first rotating shaft; and the sensor is fixedly connected with the rotary positioning plate.

The thermal transfer printer comprises a rotary positioning plate, a sensor and a support, wherein the rotary positioning plate is a circular sheet body, one end of the rotary shaft of the positioning plate is fixedly connected with the circle center of the rotary positioning plate, the other end of the rotary shaft of the positioning plate is rotatably connected with the support, a protrusion is formed on one side of the support, and the sensor is fixedly connected with one side of the rotary positioning plate, which is close to the protrusion.

The above thermal transfer printer, wherein, the cover is equipped with a torsional spring in the locating plate pivot, a torsion arm of torsional spring with support fixed connection, another torsion arm of torsional spring with rotary locating plate fixed connection still is provided with an auxiliary torsion spring on the opposite side of rotary locating plate one the pivot support, a torsion arm of auxiliary torsion spring with pivot support fixed connection, another the pivot support is arranged in between the motor with the first pivot.

The thermal transfer printer is characterized in that a first rotary shaft is sleeved with a first rotary drum, and a second rotary shaft is sleeved with a second rotary drum.

The invention adopts the technology, so that compared with the prior art, the invention has the positive effects that:

(1) The ink ribbon tensioning mechanism can tension the carbon ribbon of the thermal transfer printer to realize thermal transfer printing, and can maintain certain tension without being too loose or too tight, so that the tension of the paper ribbon is controlled in a reasonable range.

(2) The locking mechanism can rapidly open and lock the shell of the printer, and is convenient for replacing the carbon belt.

Drawings

Fig. 1 is a schematic view of a thermal transfer printer of the present invention.

Fig. 2a is a side view of the latching mechanism of the thermal transfer printer of the present invention.

Fig. 2b is a perspective view of the locking mechanism of the thermal transfer printer of the present invention.

Fig. 2c is a cross-sectional view of a lock shaft portion of the thermal transfer printer of the present invention.

Fig. 2d is a perspective view of a lock shaft portion of the thermal transfer printer of the present invention.

Fig. 2e is a front view of a latch portion of the thermal transfer printer of the present invention.

Fig. 2f is a perspective view of a latch portion of the thermal transfer printer of the present invention.

Fig. 3 is a schematic view of an ink ribbon take-up mechanism of the thermal transfer printer of the present invention.

In the accompanying drawings: 11. a control box; 12. a carbon ribbon box; 13. a partition plate; 14. a frame cover plate; 141. a handle; 2. a locking mechanism; 21. a lock shaft base; 211. an annular boss; 22. a lock shaft; 221. a clamping block; 222. a spring; 23. a lock core; 231. a pin; 232. a positioning pin; 24. a fixing plate; 241. a special-shaped hole; 25. a knob; 26. a lock catch limiting plate; 27. a cover plate limiting plate; 3. an ink ribbon tensioning mechanism; 31. a bracket; 311. a protrusion; 32. rotating the positioning plate; 321. a torsion spring; 322. an auxiliary torsion spring; 33. a motor; 34. a first rotating shaft; 341. a roller; 351. a rotating shaft bracket; 352. a rotating shaft bracket; 36. a second rotating shaft; 361. a roller; 37. a sensor; 310. an ink ribbon; .

Detailed Description

The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.

Fig. 1 is a schematic view of a thermal transfer printer according to the present invention, and referring to fig. 1, there is shown a thermal transfer printer according to a preferred embodiment, including: the machine frame comprises a control box 11 and a carbon ribbon box 12, wherein the carbon ribbon box 12 is arranged above the control box 11, a partition plate 13 is arranged between the control box 11 and the carbon ribbon box 12, and the upper side of the carbon ribbon box 12 is of an open structure. The frame cover 14 is hinged to the upper side of the carbon ribbon case 12, and the frame cover 14 is covered with the frame.

Further, as a preferred embodiment, the thermal transfer printer further comprises: a locking mechanism 2, the locking mechanism 2 comprises a locking shaft part and a locking part, the locking shaft part is connected with the frame, the locking part is connected with the frame cover plate 14, and the locking part is matched with the locking shaft part.

In addition, as a preferred embodiment, the thermal transfer printer further includes: and the two ink ribbon tensioning mechanisms 3 are arranged in the carbon ribbon box 12, the two ink ribbon tensioning mechanisms 3 are respectively arranged on two sides of the partition 13, and the two ink ribbon tensioning mechanisms 3 are opposite.

Also, as a preferred embodiment, the thermal transfer printer further comprises: a printing mechanism is provided inside the control box 11.

Further, as a preferred embodiment, the left and right sides of the frame cover 14 are also provided with handles 141.

The following details the various mechanisms of the invention:

locking mechanism 2:

fig. 2a is a side view of the locking mechanism of the thermal transfer printer of the present invention, fig. 2b is a perspective view of the locking mechanism of the thermal transfer printer of the present invention, fig. 2c is a cross-sectional view of the locking shaft portion of the thermal transfer printer of the present invention, fig. 2d is a perspective view of the locking shaft portion of the thermal transfer printer of the present invention, and referring to fig. 2a to 2d, a locking mechanism 2 of a preferred embodiment is shown, comprising: a lock shaft portion connected to the frame, and a lock catch portion connected to the frame cover 14, the lock catch portion matching the lock shaft portion, wherein the lock shaft portion includes: a lock shaft base 21, the lock shaft base 21 is a hollow cylinder structure, and an annular boss 211 is formed in the middle of the inside of the lock shaft base 21.

Furthermore, as a preferred embodiment, the lock shaft portion further includes: the lock shaft 22 is positioned in the lock shaft base 21, the lock shaft 22 penetrates through the annular boss 211, a clamping block 221 is arranged at one end of the lock shaft 22, a spring 222 is arranged between the clamping block 221 and the annular boss 211, the spring 222 is a compression spring, one end of the spring 222 abuts against the clamping block 221, the other end of the spring 222 abuts against the annular boss 211, and the clamping block 221 of the lock shaft 22 keeps away from the annular boss 211 through the spring 222.

Further, as a preferred embodiment, the lock shaft portion further includes: and one end of the lock cylinder 23 is fixedly connected with the other end of the lock shaft 22, the other end of the lock cylinder 23 is provided with a pin 231, the pin 231 is fixedly connected with the lock cylinder 23, and the pin 231 penetrates through the lock cylinder 23.

Fig. 2e is a front view of a latch portion of the thermal transfer printer of the present invention. Fig. 2f is a perspective view of a latch portion of the thermal transfer printer of the present invention, and fig. 2a to 2f are shown.

Further, as a preferred embodiment, the latch portion includes: a fixing plate 24, on which a special-shaped hole 241 is formed on the fixing plate 24, the special-shaped hole 241 is a circle with rectangular sides, and the pin 231 can be inserted into the special-shaped hole 241.

Still further, as a preferred embodiment, the latch portion includes: the knob 25 is fixedly connected with the fixing plate 24, the knob 25 is of a hollow structure, the hollow structure is communicated with the special-shaped hole 241, the pin 231 can penetrate through the special-shaped hole 241 to be arranged in the hollow structure, and the pin 231 can rotate around the axis of the lock core 23 in the hollow structure. After the pin 231 is inserted into the special-shaped hole 241, the knob 25 is rotated to drive the fixing plate 24 to rotate, at this time, the special-shaped hole 241 rotates for a certain angle relative to the pin 231, and the narrower part of the special-shaped hole 241 can clamp the pin 231, so that the locking part and the locking part are kept relatively fixed, and the locking purpose is realized. When the unlocking is needed, the knob 25 is reversely rotated, so that the wider part of the special-shaped hole is rotated to a position matched with the pin 231, and the pin 231 can be pulled out from the locking part, thereby achieving the unlocking purpose.

In addition, as a preferred embodiment, a positioning hole is formed on the side surface of the lock shaft base 21, and the positioning hole is located on the other side of the lock shaft base 21 opposite to the clamping block 221, and the positioning hole is a waist-shaped hole.

In addition, as a preferred embodiment, a positioning pin 232 is fixed to the middle part of the lock cylinder 23, the positioning pin 232 is disposed inside the positioning hole of the lock shaft base 1, and the positioning pin 232 can slide along the length direction of the lock shaft base 21 in the waist-shaped positioning hole of the lock shaft base 21.

Further, as a preferred embodiment, the outer edge of the fixing plate 24 is further provided with a locking limiting plate 26, the locking limiting plate 26 is arc-shaped, and the locking limiting plate 26 is further provided with a groove.

Still further, as a preferred embodiment, the latch portion further includes: the cover plate limiting plate 27 is fixedly connected with the frame, the cover plate limiting plate 27 is arc-shaped, the cover plate limiting plate 27 further has a protrusion, the protrusion is abutted to the lock catch limiting plate 26, and the protrusion of the cover plate limiting plate 26 is matched with the groove of the lock catch limiting plate 26. When the fixing plate 24 is rotated through the knob 25, the locking limiting plate 26 on the fixing plate is driven to rotate, when the locking limiting plate 26 rotates to a certain position from an initial position, the protrusions on the cover plate limiting plate 27 are abutted in the grooves of the locking limiting plate 26, and a user can judge that the locking mechanism has reached a locked position through the sound of collision between the protrusions and the grooves. Under the condition that unlocking is needed, a user reversely rotates the knob 25, and when the knob is rotated back to the initial position, the lock shaft 22 drives the lock cylinder 23 to retract due to the elastic force of the spring 222, so that the user can judge that the locking mechanism has reached the unlocking state.

The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the embodiments and the protection scope of the present invention.

The present invention has the following embodiments based on the above description:

in a further embodiment of the present invention, a clamping groove is provided between the knob 25 and the fixing plate 24, and a through hole matching with the clamping groove is provided on the frame cover 14, and the locking part is fixed on the frame cover 14 through the clamping groove.

In a further embodiment of the invention, the minimum width of the shaped aperture 241 is less than the length of the peg 231 and the maximum width of the shaped aperture 241 is greater than the length of the peg 231.

In a further embodiment of the invention, the diameter of the hollow structure is greater than the length of the pin 231.

In a further embodiment of the invention, the other end of the lock shaft base 21 opposite the pin 231 is fixedly connected to the frame. When the latch portion and the latch portion are latched, the chassis and chassis cover 14 is also latched by the latching of the latch portion and the latch portion.

In a further embodiment of the present invention, as shown in FIG. 1, the knob 25 protrudes outside the housing cover 14, and the lock shaft base and the fixing plate 24 are located inside the carbon ribbon housing 12.

Ribbon take-up mechanism 3:

fig. 3 is a schematic view of an ink ribbon tensioning mechanism of a thermal transfer printer according to the present invention, and referring to fig. 3, an ink ribbon tensioning mechanism 3 according to a preferred embodiment is shown, comprising: the device comprises a bracket 31, a rotary positioning plate 32, a motor 33 and a first rotating shaft 34, wherein the rotary positioning plate 32 is rotatably connected with the bracket 31 through a positioning plate rotating shaft. One end of a motor shaft of the motor 33 is fixedly connected with the rotary positioning plate 32. One end of the first rotating shaft 34 is fixedly connected with the other end of the motor shaft of the motor 33.

Furthermore, as a preferred embodiment, the ribbon take-up mechanism further includes: the rotating shaft bracket 351, the rotating shaft bracket 352 and the second rotating shaft 36, wherein the rotating shaft bracket 351 and the rotating shaft bracket 352 are respectively arranged on two sides of the first rotating shaft 34, and the rotating shaft bracket 351 and the rotating shaft bracket 352 are fixedly connected with the first rotating shaft 34. The second rotating shaft 36 is fixedly connected to the other sides of the rotating shaft bracket 351 and the rotating shaft bracket 352 with respect to the first rotating shaft 34.

In addition, as a preferred embodiment, the ribbon take-up mechanism further includes: the sensor 37, the sensor 37 is fixed connection with the rotation locating plate 32, and the sensor 37 is the contact sensor.

Further, as a preferred embodiment, the rotary positioning plate 32 is a circular plate, one end of the rotating shaft of the positioning plate is fixedly connected to the center of the rotary positioning plate 32, the other end of the rotating shaft of the positioning plate is rotatably connected to the bracket 31, and the rotary positioning plate 32 can rotate relative to the bracket 31.

Further, as a preferred embodiment, a protrusion 311 is formed on one side of the bracket 31, and the sensor 37 is fixedly connected to the side of the rotation positioning plate 32 adjacent to the protrusion 311.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the embodiments and the protection scope of the present invention.

in a further embodiment of the present invention, as shown in fig. 3, a torsion spring 321 is sleeved on the rotation shaft of the positioning plate, one torsion arm of the torsion spring 321 is fixedly connected with the bracket 31, and the other torsion arm of the torsion spring 321 is fixedly connected with the rotation positioning plate 32, so that the rotation positioning plate 32 always has a tendency to rotate anticlockwise as shown in fig. 3.

In a further embodiment of the present invention, an auxiliary torsion spring 322 is further disposed on a rotating shaft bracket 352 opposite to the rotating positioning plate 32, and a torsion arm of the auxiliary torsion spring 322 is fixedly connected to the rotating shaft bracket 352. The other torsion arm of the auxiliary torsion spring 322 can be abutted against the frame of the thermal transfer printer, and the torsion direction of the auxiliary torsion spring 322 is the same as that of the torsion spring 321. The motor shaft of the motor 33 rotates in the opposite direction to the torsion directions of the auxiliary torsion spring 322 and the torsion spring 321.

In a further embodiment of the invention, the motor shaft of the motor 33 is constantly rotated clockwise as viewed in fig. 3, and the auxiliary torsion spring 322 and the torsion spring 321 are constantly rotated counterclockwise as viewed in fig. 3.

In a further embodiment of the present invention, another rotating shaft bracket 351 is provided between the motor 33 and the first rotating shaft 34.

In a further embodiment of the present invention, the first rotating shaft 34 is sleeved with the first roller 341, the second rotating shaft 36 is sleeved with the second roller 361, and the first roller 341 and the second roller 361 have the function of reducing friction force, so as to prevent the ribbon 310 from being broken or scratched due to friction with the first rotating shaft 34 and the second rotating shaft 36 during use.

The following illustrates the method of use of the present invention:

the ink ribbon 310 passes through the first roller 341 and the second roller 361 in the direction shown in fig. 3, the second rotating shaft 36 rotates counterclockwise around the first rotating shaft 34 to the upper side in fig. 3 by the combined action of the torsion spring 321 and the torsion spring 322, the ink ribbon is tensioned, the rotation positioning plate 32 drives the sensor 37 to rotate counterclockwise together, when the sensor 37 touches the protrusion 311 of the bracket 31, the motor 33 is started, the motor shaft rotates clockwise to loosen the ink ribbon, and the sensor 37 is separated from the protrusion 311, so that the tension of the ink ribbon 310 is adjusted within a controllable range and cannot be too tight or too loose.

The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. A thermal transfer printer, comprising:

the machine frame comprises a control box and a carbon ribbon box, wherein the carbon ribbon box is arranged above the control box, a partition plate is arranged between the control box and the carbon ribbon box, and the upper side of the carbon ribbon box is of an open structure;

the frame cover plate is hinged with the upper side of the carbon ribbon box and is covered with the frame;

the locking mechanism comprises a locking shaft part and a locking part, the locking shaft part is connected with the frame, the locking part is connected with the frame cover plate, and the locking part is matched with the locking shaft part;

the two ink ribbon tensioning mechanisms are arranged in the carbon ribbon box and are respectively arranged on two sides of the partition board, and the two ink ribbon tensioning mechanisms are opposite to each other;

the printing mechanism is arranged in the control box;

wherein each of the ribbon take-up mechanisms includes:

the bracket is fixedly connected with one side of the partition plate;

the rotary positioning plate is rotatably connected with the bracket through a positioning plate rotating shaft;

one end of a motor shaft of the motor is fixedly connected with the rotary positioning plate;

one end of the first rotating shaft is fixedly connected with the other end of the motor shaft;

the two sides of the first rotating shaft are respectively provided with a rotating shaft bracket, and the rotating shaft brackets are fixedly connected with the first rotating shaft;

the second rotating shaft is fixedly connected with the other sides of the two rotating shaft brackets relative to the first rotating shaft;

the sensor is fixedly connected with the rotary positioning plate;

the locating plate is characterized in that a torsion spring is sleeved on the rotating shaft of the locating plate, one torsion arm of the torsion spring is fixedly connected with the support, the other torsion arm of the torsion spring is fixedly connected with the rotating locating plate, an auxiliary torsion spring is further arranged on the rotating shaft support corresponding to the other side of the rotating locating plate, one torsion arm of the auxiliary torsion spring is fixedly connected with the rotating shaft support, and the other rotating shaft support is arranged between the motor and the first rotating shaft.

2. The thermal transfer printer of claim 1, wherein the locking mechanism comprises:

the lock shaft base is of a hollow cylindrical structure, and an annular boss is formed in the middle of the inside of the lock shaft base;

the lock shaft is positioned in the lock shaft base, penetrates through the annular boss, a clamping block is arranged at one end of the lock shaft, and a spring is arranged between the clamping block and the annular boss;

the lock comprises a lock cylinder, wherein one end of the lock cylinder is fixedly connected with the other end of the lock shaft, a pin is arranged at the other end of the lock cylinder, the pin is fixedly connected with the lock cylinder, and the pin penetrates through the lock cylinder;

the latch portion includes:

the fixing plate is provided with a special-shaped hole, and the two sides of the special-shaped hole are provided with rectangular circles;

the knob is fixedly connected with the fixing plate, a hollow structure is arranged in the knob, and the hollow structure is communicated with the special-shaped hole.

3. The thermal transfer printer of claim 2, wherein a positioning hole is formed in a side surface of the lock shaft base, the positioning hole is located at the other side of the lock shaft base opposite to the clamping block, the positioning hole is a waist-shaped hole, a positioning pin is fixed in the middle of the lock cylinder, and the positioning pin is arranged in the positioning hole.

4. The thermal transfer printer of claim 3, further comprising:

the outer edge of the fixing plate is also provided with the lock catch limiting plate, the lock catch limiting plate is arc-shaped, and the lock catch limiting plate is also provided with a groove;

the cover plate limiting plate is fixedly connected with the frame, the cover plate limiting plate is arc-shaped, the cover plate limiting plate is further provided with a protrusion, the protrusion abuts against the lock catch limiting plate, and the protrusion is matched with the groove.

5. The thermal transfer printer of claim 4, wherein a slot is provided between the knob and the fixing plate, and a through hole is provided in the frame cover plate, the through hole being matched with the slot, and the locking portion is fixed to the frame cover plate through the slot.

6. The thermal transfer printer according to claim 1, wherein the rotary positioning plate is a circular sheet, one end of the positioning plate rotating shaft is fixedly connected with the center of the rotary positioning plate, the other end of the positioning plate rotating shaft is rotatably connected with the bracket, a protrusion is formed on one side of the bracket, and the sensor is fixedly connected with one side of the rotary positioning plate, which is close to the protrusion.

7. The thermal transfer printer of claim 1, wherein the first rotating shaft is sleeved with a first roller, and the second rotating shaft is sleeved with a second roller.