A thermal transfer printer

Abstract

The present application relates to the technical field of printing, and particularly relates to a thermal transfer printer. The thermal transfer printer comprises a frame, a printing mechanism, a ribbon mechanism, a transmission assembly and a motor. The printing mechanism comprises a rubber roller, a print head assembly, a first elastic member and a lifting assembly. The print head assembly comprises a movable frame and a print head. The movable frame has a pressing position and a lifting position. The ribbon mechanism comprises a dispensing shaft assembly and a recycling shaft assembly. The dispensing shaft assembly comprises a dispensing shaft for supporting unused ribbon. The recycling shaft assembly comprises a recycling shaft for winding used ribbon. The motor is in transmission connection with the transmission assembly. The transmission assembly is in transmission connection with the lifting assembly and the recycling shaft alternatively. When the transmission assembly is in transmission connection with the lifting assembly, the lifting assembly drives the movable frame to move to the lifting position. When the transmission assembly is in transmission connection with the recycling shaft, the recycling shaft rotates to rewind the ribbon. The thermal transfer printer uses one motor to drive the lifting assembly and the recycling shaft alternatively, thereby reducing cost and simplifying structure.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and more particularly to a thermal transfer printer. Background Technology

[0002] Existing thermal transfer printers include a frame, a rubber roller, a printing assembly, and a ribbon assembly. The rubber roller is rotatably mounted on the frame and drives the movement of sheet-like media. The printing assembly includes a movable frame, a print head, an elastic element, and a cam. The movable frame is pivotally connected to the frame via a pivot shaft. When the movable frame rotates relative to the frame around the axis of the pivot shaft, it has a depressed position and a raised position. The print head is mounted on the movable frame. When the movable frame is in the depressed position, the print head is tangentially engaged with the rubber roller for printing on the printing media. When the movable frame is in the raised position, the print head is separated from the rubber roller. The elastic element is connected to the movable frame, and under the action of the elastic element, the movable frame always tends to move to the depressed position. The cam is rotatably connected to the frame, and when the cam rotates, it drives the movable frame to move to the raised position. The ribbon assembly includes a dispensing shaft and a retracting shaft spaced apart. When the retracting shaft rotates, it can rewind the ribbon led out by the dispensing shaft. Because the rotation of the cam and the rotation of the retracting shaft are driven by different motors, the cost of the thermal transfer printer is high and it is not conducive to achieving a compact structure for the thermal transfer printer. Summary of the Invention

[0003] The purpose of this invention is to provide a low-cost, compact thermal transfer printer.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A thermal transfer printer includes a frame, a printing mechanism, a ribbon mechanism, a transmission assembly, and a motor. The printing mechanism includes a rubber roller, a printhead assembly, a first elastic element, and a lifting assembly. The rubber roller is rotatably mounted on the frame. The printhead assembly includes a movable frame and a printhead mounted on the movable frame. The movable frame is movably connected to the frame and has a depressed position and a lifted position relative to the frame. When the movable frame is in the depressed position, the printhead engages with the rubber roller; when the movable frame is in the lifted position, the printhead disengages from the rubber roller. The first elastic element is configured to always have a tendency to move the movable frame towards the depressed position. The lifting assembly drives the movable frame. The ribbon mechanism is moved to the raised position. It includes a dispensing shaft assembly and a retracting shaft assembly. The dispensing shaft assembly includes a dispensing shaft for supporting unused ribbon, and the retracting shaft assembly includes a retracting shaft for winding used ribbon. The motor is driven by the transmission assembly, which is selectively driven by both the raised assembly and the retracting shaft. When the transmission assembly is driven by the raised assembly, it transmits the power output from the motor to the raised assembly, causing the raised assembly to drive the movable frame to the raised position. When the transmission assembly is driven by the retracting shaft, it transmits the power output from the motor to the retracting shaft, causing the retracting shaft to rotate and rewind the ribbon.

[0006] As an optional embodiment, the transmission assembly includes a first support shaft, a first gear, a second gear, and a swing member. The first support shaft is fixedly connected to the frame, and the first gear is driven by the motor and can rotate around the axis of the first support shaft. The swing member is sleeved on the first support shaft and can rotate around the axis of the first support shaft. The swing member is frictionally connected to the first gear, and there is a preset friction force between them. The preset friction force is configured such that when the first gear rotates, it can drive the swing member to rotate, and when the resistance of the swing member is greater than the preset friction force, the swing member slips relative to the first gear. The second gear is mounted on the swing member and is driven by the first gear. When the output shaft of the motor rotates in the forward direction, the first gear drives the swing member to rotate in a first direction, so that the second gear is driven by the lifting assembly. When the output shaft of the motor rotates in the reverse direction, the first gear drives the swing member to rotate in a second direction, so that the second gear is driven by the retraction shaft, wherein the first direction and the second direction are opposite.

[0007] Alternatively, the axial end face of the first gear may be in frictional connection with the axial end face of the oscillating member, or the radial circumferential surface of the first gear may be in frictional connection with the radial circumferential surface of the oscillating member.

[0008] As an optional solution, when the radial circumferential surface of the first gear is in frictional contact with the radial circumferential surface of the swing member, the first gear includes a first sleeve, the swing member includes a second sleeve, the first sleeve is sleeved on the first support shaft, the second sleeve is sleeved on the first sleeve, and the inner circumferential surface of the second sleeve is in frictional contact with the outer circumferential surface of the first sleeve; or, the second sleeve is sleeved on the first support shaft, the first sleeve is sleeved on the second sleeve, and the inner circumferential surface of the first sleeve is in frictional contact with the outer circumferential surface of the second sleeve.

[0009] As an optional solution, when the first sleeve is fitted onto the second sleeve, the first sleeve has at least two first opening slots spaced apart along its circumference, each of the first opening slots extending along the axial direction of the first sleeve; or, when the second sleeve is fitted onto the first sleeve, the second sleeve has at least two second opening slots spaced apart along its circumference, each of the second opening slots extending along the axial direction of the second sleeve.

[0010] As an optional embodiment, the frame includes a fixed frame and a rotating shaft supported by the fixed frame; the movable frame is sleeved on the rotating shaft and can rotate around the rotating shaft to the raised position and the pressed position; the raised assembly includes a camshaft, a cam, and a cam gear, the camshaft is rotatably supported by the frame, the cam and the cam gear are both fixedly sleeved on the camshaft, the cam gear is used to mesh with the second gear, when the second gear is connected to the raised assembly, the second gear meshes with the cam gear, the motor drives the camshaft to drive the cam to rotate, so that the cam abuts against the movable frame and drives the movable frame to rotate to the raised position.

[0011] As an optional embodiment, the camshaft is provided with a first limiting surface and a second limiting surface, both of which are parallel to and spaced apart from the axis of the camshaft; the lifting assembly further includes a limiting member and a second elastic member, the limiting member being movably connected to the frame and capable of moving relative to the frame, the limiting member including a blocking surface; the second elastic member is connected to the limiting member and configured to apply a second elastic force to the limiting member, wherein when the cam drives the movable frame to the lifting position, the second elastic force causes the blocking surface to abut against the first limiting surface, and when the cam separates from the movable frame, the second elastic force causes the blocking surface to abut against the second limiting surface.

[0012] As an optional solution, the fixed frame includes a first wall, a second wall, and a third wall connected at an angle in sequence, the third wall being opposite to the first wall, and the second wall having a clearance groove; the movable frame includes a first plate, a second plate, and a third plate connected at an angle in sequence, the third plate passing through the clearance groove between the first wall and the third wall, so that the first plate is opposite to the first wall, the print head is fixed to the side of the first plate away from the third plate, the first elastic element is a compression spring, and the compression spring is connected between the first plate and the first wall; the cam is located between the third plate and the first wall, and when the cam rotates, it can abut against the third plate to drive the movable frame to rotate to the raised position.

[0013] As an optional embodiment, the recycling shaft assembly further includes a second support shaft, a ribbon gear, and a ratchet and pawl mechanism. The second support shaft is fixedly mounted on the frame, and both the ribbon gear and the recycling shaft are rotatably mounted on the second support shaft. The ribbon gear is used for transmission connection with the transmission assembly. The ratchet and pawl mechanism includes a ratchet and a pawl. One of the ratchet and the pawl is connected to the ribbon gear, and the other of the ratchet and the pawl is connected to the recycling shaft. When the transmission assembly is transmissionally connected to the ribbon gear and drives the ribbon gear to rotate, the pawl meshes with the ratchet and drives the recycling shaft to rotate to rewind the ribbon.

[0014] As an optional embodiment, the recycling shaft assembly further includes a second support shaft, a ribbon gear, a locking disc, a locking element, and a ratchet and pawl mechanism. The second support shaft is fixedly mounted on the frame. The ribbon gear and the recycling shaft are rotatably mounted on the second support shaft. The ribbon gear is used for transmission connection with the transmission assembly. The locking disc is frictionally connected to the recycling shaft. The locking element is rotatably connected to the end face of the ribbon gear. The ratchet and pawl mechanism includes a ratchet and a pawl. The ratchet is fixedly connected to the locking disc, and the pawl is fixedly connected to the locking element. When the transmission assembly is transmissionally connected to the ribbon gear and drives the ribbon gear to rotate, the ribbon gear drives the pawl to mesh with the ratchet. The ratchet drives the recycling shaft to rotate through the locking disc to rewind the ribbon.

[0015] The beneficial effects of this invention are:

[0016] This invention provides a thermal transfer printer, which includes a frame, a printing mechanism, a ribbon mechanism, a transmission assembly, and a motor. The printing mechanism includes a rubber roller, a printhead assembly, a first elastic element, and a lifting assembly. The rubber roller is rotatably mounted on the frame. The printhead assembly includes a movable frame and a printhead mounted on the movable frame. The movable frame is movably connected to the frame and has a depressed position and a lifted position relative to the frame. When the movable frame is in the depressed position, the printhead engages with the rubber roller; when the movable frame is in the lifted position, the printhead separates from the rubber roller. The first elastic element is configured to always have a tendency to move the movable frame towards the depressed position. The lifting assembly... The device is used to drive the movable frame to the raised position; the ribbon mechanism includes a dispensing shaft assembly and a take-up shaft assembly. The dispensing shaft assembly includes a dispensing shaft for supporting unused ribbon, and the take-up shaft assembly includes a take-up shaft for winding used ribbon; the motor is driven by a transmission assembly, which is selectively driven by the raising assembly and the take-up shaft. When the transmission assembly is driven by the raising assembly, it transmits the power output from the motor to the raising assembly, so that the raising assembly drives the movable frame to the raised position. When the transmission assembly is driven by the take-up shaft, it transmits the power output from the motor to the take-up shaft, so that the take-up shaft rotates to rewind the ribbon.

[0017] The thermal transfer printer provided by this invention, during normal printing, has the movable frame in the depressed position, the print head engaged with the rubber roller, and the printing medium passing between the print head and the rubber roller. Unused ribbon is placed on the feed shaft. After passing between the print head and the rubber roller, the ribbon is wound onto the take-up shaft. The take-up shaft rotates to rewind the ribbon, and the feed shaft rotates to release the ribbon. Simultaneously, the print head heats up, melting the toner on the ribbon and transferring it to the printing medium. When feeding paper empty, the movable frame is in the raised position, the print head and the rubber roller are separated, and the printing medium passes through the gap between them. During normal printing, the motor, transmission assembly, and take-up shaft are sequentially connected, driving the take-up shaft to rewind the ribbon. When feeding paper empty, the motor, transmission assembly, and lifting assembly are sequentially connected, enabling the lifting assembly to drive the movable frame to the raised position, separating the print head from the rubber roller. Simultaneously, the take-up shaft has no power and does not rotate, while the printing medium passes through the gap between the print head and the rubber roller. The thermal transfer printer provided by this invention uses the same motor to selectively drive the lifting component and the retracting shaft, which greatly reduces costs, simplifies the structure, and improves structural compactness. At the same time, when printing blank data, only the lifting component needs to be driven, without driving the retracting shaft, thereby avoiding ribbon waste and reducing equipment operating costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the thermal transfer printer provided in this embodiment of the invention when the movable frame is in the raised position;

[0019] Figure 2 This is a schematic diagram of the structure of the thermal transfer printer provided in this embodiment of the invention when the movable frame is in the depressed position;

[0020] Figure 3 This is a schematic diagram of the structure of the thermal transfer printer provided in this embodiment of the invention when the transmission component and the lifting component are connected in a transmission manner;

[0021] Figure 4 This is a schematic diagram of the structure of the thermal transfer printer provided in this embodiment of the invention when the transmission component is connected to the recycling shaft.

[0022] Figure 5 This is a schematic diagram of a first partial structure of the thermal transfer printer provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the transmission component in the thermal transfer printer provided in an embodiment of the present invention;

[0024] Figure 7 This is an exploded view of the transmission component in the thermal transfer printer provided in this embodiment of the invention;

[0025] Figure 8 This is a first partial structural cross-sectional view of the thermal transfer printer provided in an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the second partial structure of the thermal transfer printer provided in an embodiment of the present invention;

[0027] Figure 10 This is a second partial structural cross-sectional view of the thermal transfer printer provided in an embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the third partial structure of the thermal transfer printer provided in an embodiment of the present invention;

[0029] Figure 12 This is a schematic diagram of the fourth partial structure of the thermal transfer printer provided in an embodiment of the present invention;

[0030] Figure 13 This is a schematic diagram of the fifth partial structure of the thermal transfer printer provided in an embodiment of the present invention;

[0031] Figure 14 This is a third partial structural cross-sectional view of the thermal transfer printer provided in an embodiment of the present invention;

[0032] Figure 15 This is a schematic diagram of the sixth partial structure of the thermal transfer printer provided in an embodiment of the present invention.

[0033] In the picture:

[0034] 1. Frame; 11. Mounting base; 12. Fixture; 121. First wall; 122. Second wall; 101. Clearance groove; 123. Third wall; 124. Fourth wall; 125. Fifth wall; 13. Rotating shaft;

[0035] 2. Printing mechanism; 21. Glue roller; 22. Print head assembly; 221. Movable frame; 201. First plate; 202. Second plate; 203. Third plate; 204. Fourth plate; 205. Fifth plate; 222. Print head; 23. First elastic element; 24. Lifting assembly; 241. Camshaft; 206. First limiting surface; 207. Second limiting surface; 242. Cam; 243. Cam gear; 244. Limiting element; 208. Blocking surface; 245. Second elastic element;

[0036] 3. Ribbon mechanism; 311. Dispensing shaft; 32. Retrieval shaft assembly; 321. Retrieval shaft; 322. Second support shaft; 323. Ribbon gear; 303. Groove; 304. Limiting post; 305. Support post; 324. Ratchet and pawl mechanism; 301. Ratchet; 302. Pawl; 325. Locking disc; 326. Locking element; 306. Protrusion; 327. Torsion spring; 328. Code disc; 329. Sensor;

[0037] 4. Transmission assembly; 41. First support shaft; 42. First gear; 421. First sleeve; 422. Gear section; 43. Second gear; 44. Swinging component; 441. Second sleeve; 401. Second opening slot; 442. Third sleeve; 443. Connecting rod; 45. Gear shaft;

[0038] 5. Motor; 51. Motor gear; 52. Motor output shaft; 6. Pivot shaft. Detailed Implementation

[0039] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0043] like Figures 1 to 15 As shown, this embodiment provides a thermal transfer printer, which includes a frame 1, a printing mechanism 2, a ribbon mechanism 3, a transmission assembly 4, and a motor 5. The printing mechanism 2 includes a rubber roller 21, a printhead assembly 22, a first elastic element 23, and a lifting assembly 24. The rubber roller 21 is rotatably mounted on the frame 1. The printhead assembly 22 includes a movable frame 221 and a printhead 222 mounted on the movable frame 221. The movable frame 221 is movably connected to the frame 1 and has a depressed position and a lifted position relative to the frame 1. When the movable frame 221 is in the depressed position, the printhead 222 engages with the rubber roller 21. When the movable frame 221 is in the lifted position, the printhead 222 separates from the rubber roller 21. The first elastic element 23 is configured to always have the ability to move the movable frame 221 towards the depressed position. The lifting assembly 24 drives the movable frame 221 to the lifted position; the ribbon mechanism 3 includes a dispensing shaft assembly and a retracting shaft assembly 32. The dispensing shaft assembly includes a dispensing shaft 311 for supporting unused ribbon, and the retracting shaft assembly 32 includes a retracting shaft 321 for winding used ribbon; the motor 5 is driven by the transmission assembly 4, which is selectively driven by both the lifting assembly 24 and the retracting shaft 321. When the transmission assembly 4 is driven by the lifting assembly 24, it transmits the power output from the motor 5 to the lifting assembly 24, causing the lifting assembly 24 to drive the movable frame 221 to the lifted position. When the transmission assembly 4 is driven by the retracting shaft 321, it transmits the power output from the motor 5 to the retracting shaft 321, causing the retracting shaft 321 to rotate and rewind the ribbon.

[0044] In this embodiment, the thermal transfer printer is normally operated with the movable frame 221 in the depressed position, the print head 222 cooperating with the rubber roller 21, and the printing medium passing between the print head 222 and the rubber roller 21. Unused ribbon rolls are placed on the dispensing shaft 311. After passing between the print head 222 and the rubber roller 21, the ribbon is wound onto the take-up shaft 321. Rotation of the take-up shaft 321 can rewind the ribbon, and rotation of the dispensing shaft 311 can release the ribbon roll. At the same time, the print head 222 heats up, melting the toner on the ribbon and transferring it to the printing medium. When feeding paper empty, the movable frame 221 is in the raised position, the print head 222 and the rubber roller 21 are separated, and the printing medium passes through the gap between the print head 222 and the rubber roller 21. In this embodiment, during normal printing, the thermal transfer printer has the motor 5, transmission assembly 4, and take-up shaft 321 connected in sequence. The motor 5 can drive the take-up shaft 321 to rotate to rewind the ribbon. When the paper is empty, the motor 5, transmission assembly 4, and lifting assembly 24 are connected in sequence. The motor 5 can drive the lifting assembly 24 to move the movable frame 221 to the lifted position, so that the print head 222 is separated from the rubber roller 21. At the same time, the take-up shaft 321 has no power and will not rotate, while the printing medium passes through the gap between the print head 222 and the rubber roller 21. The thermal transfer printer provided in this embodiment uses the same motor 5 to selectively drive the lifting assembly 24 and the take-up shaft 321, which greatly reduces costs, simplifies the structure, and improves the structural compactness of the thermal transfer printer. At the same time, the lifting of the print head 222 and the rotation of the take-up shaft 321 are driven by the same motor 5, making the control more flexible and improving printing accuracy and efficiency. Moreover, the separation and engagement control of the print head 222 and the rubber roller 21 is more flexible, avoiding paper jamming or paper stacking problems caused by the print head 222 and the rubber roller 21 clamping paper, thus improving print quality. Finally, when printing blank data, only the lifting assembly 24 needs to be driven, without driving the take-up shaft 321, thereby avoiding ribbon waste and reducing equipment operating costs.

[0045] In this embodiment, as Figures 3-5 As shown, the transmission assembly 4 includes a first support shaft 41, a first gear 42, a second gear 43, and a swing member 44. The first support shaft 41 is fixedly connected to the frame 1. The first gear 42 is driven by the motor 5 and can rotate around the axis of the first support shaft 41. The swing member 44 is sleeved on the first support shaft 41 and can rotate around the axis of the first support shaft 41. The swing member 44 is frictionally connected to the first gear 42, and there is a preset friction force between them. The preset friction force is configured such that when the first gear 42 rotates, it can drive the swing member 44 to rotate. When the resistance of the swing member 44 is greater than the preset friction force, the swing member 44 and the first gear 42 slip relative to each other. The second gear 43 is installed on the swing member 44 and is driven by the first gear 42. When the output shaft of the motor 5 moves in the positive direction ( Figure 3When the first gear 42 rotates in the direction indicated by arrow a), it drives the oscillating member 44 to rotate in the first direction, so that the second gear 43 is connected to the lifting assembly 24. When the second gear 43 is connected to the lifting assembly 24, the resistance experienced by the oscillating member 44 is greater than the preset friction force, and the oscillating member 44 slips relative to the first gear 42. The oscillating member 44 stops rotating and remains in the position where the second gear 43 is connected to the lifting assembly 24. When the output shaft of the motor 5 rotates in the reverse direction (…), the first gear 42 drives the oscillating member 44 to rotate in the first direction, so that the second gear 43 is connected to the lifting assembly 24. Figure 4 When rotating in the direction indicated by arrow b, the first gear 42 drives the oscillating member 44 to rotate in the second direction, so that the second gear 43 is connected to the retrieval shaft 321. When the second gear 43 is connected to the retrieval shaft 321, the resistance experienced by the oscillating member 44 is greater than the preset frictional force, and the oscillating member 44 slips relative to the first gear 42, stopping the rotation of the oscillating member 44 and maintaining the position where the second gear 43 is connected to the retrieval shaft 321. The first direction is opposite to the second direction. The transmission assembly 4 provided in this embodiment has a simple structure and low cost.

[0046] It should be noted that the frictional connection between A and B in this embodiment means that there is friction between A and B. Under the action of friction, when A rotates, it can drive B to rotate. When the resistance on B is greater than the friction, A and B slip, and A's rotation cannot drive B to rotate.

[0047] It should be noted that the positive direction mentioned above can be the same as or opposite to the first direction.

[0048] It should be noted that the transmission connection between the second gear 43 and the first gear 42 means that the rotation of the first gear 43 can drive the rotation of the second gear 42. In this embodiment, the second gear 43 and the first gear 42 are meshed together. In other embodiments, the transmission assembly 4 also includes a transition gear, which is rotatably mounted on the swing member 44. The second gear 43, the transition gear, and the first gear 42 are meshed together in sequence.

[0049] Specifically, the frame 1 includes a mounting base 11, and a first support shaft 41 is fixedly inserted into the mounting base 11. The motor 5 is fixed on the mounting base 11, and a motor gear 51 is fixedly sleeved on the motor output shaft 52. The motor gear 51 meshes with the first gear 42. When the motor output shaft 52 rotates in the forward direction and the second gear 43 is connected to the lifting assembly 24, the sequentially meshing motor gear 51, the first gear 42, and the second gear 43 transmit the power of the motor 5 to the lifting assembly 24, so that the lifting assembly 24 drives the movable frame 221 to the lifting position. When the motor output shaft 52 rotates in the reverse direction and the second gear 43 is connected to the recovery shaft 321, the sequentially meshing motor gear 51, the first gear 42, and the second gear 43 transmit the power of the motor 5 to the recovery shaft 321, so that the recovery shaft 321 rotates and rewinds the ribbon.

[0050] Optionally, the axial end face of the first gear 42 is frictionally connected to the axial end face of the oscillating member 44, or the radial circumferential surface of the first gear 42 is frictionally connected to the radial circumferential surface of the oscillating member 44. The transmission between the oscillating member 44 and the first gear 42 is achieved through end face friction connection or circumferential surface friction connection, which has the advantages of simple structure and low cost. In this embodiment, as... Figure 6 and Figure 7 As shown, the radial circumferential surface of the first gear 42 is in frictional connection with the radial circumferential surface of the swing member 44. In other embodiments, the axial end face of the first gear 42 is in frictional connection with the axial end face of the swing member 44. When the axial end face of the first gear 42 is in frictional connection with the axial end face of the swing member 44, the first gear 42 and the swing member 44 are sequentially sleeved on the first support shaft 41, and their adjacent axial end faces abut against each other and have a preset frictional force. In other embodiments, the transmission assembly 4 also includes a felt pad and a first compression spring. The felt pad and the first compression spring are both sleeved on the first support shaft 41. The felt pad is located between the first gear 42 and the swing member 44. The first compression spring biases the swing member 44, causing the swing member 44 to press the felt pad tightly against the axial end face of the first gear 42. With the above arrangement, the axial end face of the swing member 44 is in frictional connection with the axial end face of the first gear 42 through the felt pad. Utilizing the high coefficient of friction of the felt pad and the pressure of the first compression spring, the axial end face of the swing member 44 is in frictional connection with the first support shaft 41. The friction between the axial end faces of gear 42 meets the set requirements, so that when the first gear 42 rotates, it can reliably drive the swing member 44 to rotate around the axis of the first support shaft 41. It can also be connected to the lifting assembly 24 or the retraction shaft 321 by the second gear 43. When the resistance of the swing member 44 is greater than the preset friction force, the first gear 42 and the swing member 44 slip relative to each other, so that the swing member 44 stops rotating. In this way, the power of the motor 5 can be reliably transmitted to the lifting assembly 24 or the retraction shaft 321.

[0051] like Figure 6 and Figure 7As shown, when the radial circumferential surface of the first gear 42 is in frictional contact with the radial circumferential surface of the oscillating member 44, the first gear 42 includes a first sleeve 421, and the oscillating member 44 includes a second sleeve 441. The first sleeve 421 is sleeved on the first support shaft 41, and the second sleeve 441 is sleeved on the first sleeve 421. The inner circumferential surface of the second sleeve 441 is in frictional contact with the outer circumferential surface of the first sleeve 421. Alternatively, the second sleeve 441 is sleeved on the first support shaft 41, and the first sleeve 421 is sleeved on the second sleeve 441. The inner circumferential surface of the first sleeve 421 is in frictional contact with the outer circumferential surface of the second sleeve 441. In this embodiment, the first sleeve 421 is sleeved on the first support shaft 41, and the second sleeve 441 is sleeved on the first sleeve 421. The inner circumferential surface of the second sleeve 441 is in frictional contact with the outer circumferential surface of the first sleeve 421. In other embodiments, the second sleeve 441 is sleeved on the first support shaft 41, the first sleeve 421 is sleeved on the second sleeve 441, and the inner circumferential surface of the first sleeve 421 is frictionally connected to the outer circumferential surface of the second sleeve 441.

[0052] Specifically, in this embodiment, the first gear 42 further includes a gear portion 422 coaxially and fixedly connected to the first sleeve 421. The gear portion 422 meshes with the second gear 43 and is also meshed with the motor gear 51. The swing member 44 further includes a third sleeve 442 and a connecting rod 443. The third sleeve 442 is arranged parallel to and spaced apart from the second sleeve 441. The connecting rod 443 connects the second sleeve 441 and the third sleeve 442. The transmission assembly 4 further includes a gear shaft 45, which is inserted into the third sleeve 442. The second gear 43 is sleeved on the gear shaft 45. Optionally, the gear shaft 45 is fixedly inserted into the third sleeve 442, and the second gear 43 can rotate around the gear shaft 45. Alternatively, the gear shaft 45 is rotatably inserted into the third sleeve 442, and the second gear 43 is fixedly sleeved on the gear shaft 45, allowing the second gear 43 to rotate relative to the third sleeve 442 along with the gear shaft 45.

[0053] Optionally, when the first sleeve 421 is fitted onto the second sleeve 441, the first sleeve 421 has at least two first opening slots spaced apart along its circumference, each first opening slot extending axially along the first sleeve 421; or, when the second sleeve 441 is fitted onto the first sleeve 421, the second sleeve 441 has at least two second opening slots 401 spaced apart along its circumference, each second opening slot 401 extending axially along the second sleeve 441. By providing opening slots, the connection structure between adjacent opening slots is elastic, thus allowing an interference fit between the first sleeve 421 and the second sleeve 441. Utilizing the elastic deformation of the connection structure, the first sleeve 421 is fitted onto and held tightly onto the second sleeve 441 / or the second sleeve 441 is fitted onto and held tightly onto the first sleeve 421, thereby achieving a preset frictional force between the first sleeve 421 and the second sleeve 441, ensuring the transmission reliability of the transmission assembly 4. In this embodiment, as... Figure 6 and Figure 7 As shown, the second sleeve 441 is sleeved on the first sleeve 421. The second sleeve 441 has at least two second opening slots 401 arranged at intervals along its circumference, and each second opening slot 401 extends along the axial direction of the second sleeve 441. Optionally, the materials of the swing member 44 and the first gear 42 are both plastic.

[0054] In this embodiment, as Figures 8-10 As shown, the frame 1 also includes a fixed frame 12 and a rotating shaft 13 supported by the fixed frame 12; the movable frame 221 is sleeved on the rotating shaft 13 and can rotate around the rotating shaft 13 to a raised position and a pressed position; the lifting assembly 24 includes a camshaft 241, a cam 242, and a cam gear 243. The camshaft 241 is rotatably supported by the frame 1. The cam 242 and the cam gear 243 are both fixedly sleeved on the camshaft 241. The cam gear 243 is used to mesh with the second gear 43. When the second gear 43 meshes with the cam gear 243, the motor 5 drives the camshaft 241 to rotate the cam 242, so that the cam 242 abuts against the movable frame 221 and drives the movable frame 221 to rotate to the raised position. Optionally, the camshaft 241 is rotatably supported by the fixed frame 12. Optionally, the first elastic element 23 is connected between the fixed frame 12 and the movable frame 221.

[0055] In this embodiment, as Figures 9-11As shown, the camshaft 241 is provided with a first limiting surface 206 and a second limiting surface 207. Both the first limiting surface 206 and the second limiting surface 207 are parallel to and spaced apart from the axis of the camshaft 241. The lifting assembly 24 also includes a limiting member 244 and a second elastic member 245. The limiting member 244 is movably connected to the frame 1 and can move relative to the frame 1. The limiting member 244 includes a blocking surface 208. The second elastic member 245 is connected to the limiting member 244. The second elastic element 245 is configured to apply a second elastic force to the limiting element 244. The second elastic force causes the blocking surface 208 of the limiting element 244 to always have a tendency to abut against the cam shaft 241. Specifically, when the cam 242 drives the movable frame 221 to move to the lifted position, the second elastic force causes the blocking surface 208 to abut against the first limiting surface 206, and when the cam 242 separates from the movable frame 221, the second elastic force causes the blocking surface 208 to abut against the second limiting surface 207. In this embodiment, the second elastic element 245 is a tension spring. The first end of the limiting element 244 is pivotally connected to the frame 1 via the pivot shaft 6. The first end of the tension spring is connected to the first support shaft 41, and the second end of the tension spring is connected to the second end of the limiting element 244. The blocking surface 208 is located between the first and second ends of the limiting element 244. Under the tension of the tension spring, the blocking surface 208 of the limiting element 244 is always in contact with the cam shaft 241. When the cam 242 drives the movable frame 221 to the raised position, the blocking surface 208 abuts against the first limiting surface 206. When the cam 242 separates from the movable frame 221, the blocking surface 208 abuts against the second limiting surface 207. In other embodiments, the limiting element 244 is slidably connected to the frame 1.

[0056] In this embodiment, since both the first limiting surface 206 and the second limiting surface 207 are parallel to the axis of the camshaft 241, the blocking surface 208 can block the rotation of the camshaft 241 when it abuts against either the first limiting surface 206 or the second limiting surface 207. When the motor 5 rotates in the forward direction, it drives the swing member 44 to rotate in the first direction, causing the second gear 43 to mesh with the cam gear 243, driving the camshaft 241 to rotate. The camshaft 241 drives the limiting member 244 to rotate against the elastic force of the second elastic member 245. When the camshaft 241 rotates and causes the cam 242 to drive the movable frame 221 to rotate to the lifted position, the motor 5 stops working. At this time, the first limiting surface 206 on the camshaft 241 abuts against the blocking surface 208 of the limiting member 244, locking the cam 24. At position 2, cam 242 will no longer rotate, so the movable frame 221 is stable in the raised position. Before the print head 222 is lowered and the drive retraction shaft assembly 32 is rotated, the motor 5 continues to rotate in the forward direction, causing cam 242 to separate from the movable frame 221. The movable frame 221 rotates to the pressed position under the action of the first elastic member 23. When the second limiting surface 207 on the cam shaft 241 abuts against the blocking surface 208 of the limiting member 244, the motor 5 stops rotating. Under the action of the second elastic member 245, the position of the cam shaft 241 is locked, preventing cam 242 from continuing to rotate and thus contacting the movable frame 221 and affecting the print head 222. Then the motor 5 rotates in the reverse direction, driving the swing member 44 to rotate in the second direction, causing the second gear 43 to separate from the cam gear 243. In this embodiment, by providing a limiting member 244 connected to the second elastic member 245, the blocking surface 208 of the limiting member 244 is always in contact with the camshaft 241, and when the cam 242 drives the movable frame 221 to move to the raised or lowered position, it can prevent the camshaft 241 from rotating, so that the movable frame 221 is kept in the lowered or raised position, thereby improving the stability of the print head 222 position.

[0057] In this embodiment, as Figure 9 , Figure 10 and Figure 12As shown, the fixed frame 12 includes a first wall 121, a second wall 122, and a third wall 123 connected at an angle in sequence. The third wall 123 is opposite to the first wall 121, and the second wall 122 is provided with a clearance groove 101. The movable frame 221 includes a first plate 201, a second plate 202, and a third plate 203 connected at an angle in sequence. The third plate 203 passes through the clearance groove 101 between the first wall 121 and the third wall 123, so that the first plate 201 is opposite to the first wall 121. The print head 222 is fixed on the side of the first plate 201 away from the third plate 203. The first elastic element 23 is a compression spring, and the compression spring is connected between the first plate 201 and the first wall 121. The cam 242 is located between the third plate 203 and the first wall 121. When the cam 242 rotates, it can abut against the third plate 203 to drive the movable frame 221 to rotate to the raised position. Optionally, the fixed frame 12 further includes a fourth wall 124 and a fifth wall 125 arranged at intervals. The first ends of the fourth wall 124 and the fifth wall 125 are respectively connected at an angle to the two ends of the second wall 122. The pivot 13 supports the second ends of the fourth wall 124 and the fifth wall 125. The movable frame 221 further includes a fourth plate 204 and a fifth plate 205 arranged at intervals. The first ends of the fourth plate 204 and the fifth plate 205 are respectively connected at an angle to the two ends of the second plate 202. The fourth plate 204 is opposite to the fourth wall 124, and the fifth plate 205 is opposite to the fifth wall 125. The second ends of the fourth plate 204 and the fifth plate 205 are respectively sleeved on the pivot 13, so that the movable frame 221 can rotate around the pivot 13 to the raised position and the pressed position. In this embodiment, the connection structure between the printhead assembly 22 and the fixed frame 12 is compact, and the support for the printhead 222 is reliable.

[0058] In this embodiment, as Figures 13-15 As shown, the recovery shaft assembly 32 also includes a second support shaft 322, a ribbon gear 323, and a ratchet-pawl mechanism 324. The second support shaft 322 is fixedly mounted on the frame 1. Both the ribbon gear 323 and the recovery shaft 321 are rotatably mounted on the second support shaft 322. The ribbon gear 323 is used for transmission connection with the transmission assembly 4. The ratchet-pawl mechanism 324 includes a ratchet 301 and a pawl 302. One of the ratchet 301 and the pawl 302 is connected to the ribbon gear 323, and the other of the ratchet 301 and the pawl 302 is connected to the recovery shaft 321. When the transmission assembly 4 is transmissionally connected to the ribbon gear 323 and drives the ribbon gear 323 to rotate, the pawl 302 meshes with the ratchet 301 and drives the recovery shaft 321 to rotate to rewind the ribbon. By setting the ratchet-pawl mechanism 324, when the motor 5 drives the ribbon gear 323 along the transmission assembly 4... Figure 15When rotating in the direction indicated by arrow b, the ribbon gear 323 pushes the take-up shaft 321 to rotate in the same direction through the meshing ratchet 302 and pawl 301. The take-up shaft 321 rewinds the ribbon. When the transmission assembly 4 disengages from the ribbon gear 323, if the take-up shaft 321 wants to release the rewinding ribbon, that is, if the take-up shaft 321 moves along... Figure 15 Rotating in the direction indicated by arrow a causes ratchet 301 and pawl 302 to re-engage, preventing take-up shaft 321 from rotating in the direction indicated by arrow a. This prevents the take-up shaft 321 from rotating and releasing the ribbon, thus preventing the ribbon from slackening and keeping the ribbon taut, thereby ensuring printing quality. When installing a new ribbon, the starting end of the ribbon needs to be wound around the take-up shaft 321. At this time, the take-up shaft 321 needs to be manually rotated in the direction of arrow b. At this time, pawl 302 slips relative to ratchet 301, so the take-up shaft 321 can be rotated to wind the ribbon onto it. In this embodiment, a ratchet and pawl mechanism 324 is provided between the ribbon gear 323 and the take-up shaft 321. This mechanism not only transmits power from the ribbon gear 323 to the take-up shaft 321 to rewind the ribbon, but also prevents the take-up shaft 321 from rotating in the opposite direction and releasing the ribbon when there is no power to drive it to rewind. This prevents the ribbon on the take-up shaft 321 from becoming loose and affecting the printing effect. Furthermore, it allows for manual ribbon installation by winding the ribbon onto the take-up shaft 321. The structure is simple and inexpensive. Optionally, in this embodiment, the ratchet 301 is connected to the take-up shaft 321, and the pawl 302 is connected to the ribbon gear 323. In other embodiments, the ratchet 301 is connected to the ribbon gear 323, and the pawl 302 is connected to the take-up shaft 321.

[0059] Optionally, the recycling shaft assembly 32 further includes an encoder 328 and a sensor 329. The encoder 328 is coaxially and fixedly connected to the ribbon gear 323. The sensor 329 is mounted on the frame 1 and is used to cooperate with the encoder 328. The sensor 329 cooperates with the encoder 328 to detect the rotation speed of the recycling shaft 321. When the rotation speed of the recycling shaft 321 is too high, the motor 5 can be controlled to reduce the speed to avoid breaking the ribbon. It should be noted that in this embodiment, the second support shaft 322 is fixedly mounted on the mounting base 11, and the sensor 329 is mounted on the mounting base 11.

[0060] like Figures 13-15As shown, in this embodiment, the recycling shaft assembly 32 further includes a locking disc 325 and a locking member 326. The locking disc 325 is frictionally connected to the recycling shaft 321, and the locking member 326 is rotatably connected to the end face of the ribbon gear 323. The ratchet 301 is fixedly connected to the locking disc 325, and the pawl 302 is fixedly connected to the locking member 326. When the transmission assembly 4 is connected to the ribbon gear 323 and drives the ribbon gear 323 to rotate, the ribbon gear 323 drives the pawl 302 to mesh with the ratchet 301. The ratchet 301 drives the recycling shaft 321 to rotate through the locking disc 325 to rewind the ribbon. Specifically, the end face of the ribbon gear 323 is fixed with a groove 303, and a support post 305 and a limiting post 304 are provided in the groove 303. Both the support post 305 and the limiting post 304 extend along the axis of the ribbon gear 323. The middle part of the locking member 326 is sleeved on the support post 305 and can rotate around the support post 305. The pawl 302 is fixedly connected to the first end of the locking member 326. The second end of the locking member 326 is located between the limiting post 304 and the side wall of the groove 303. Optionally, the second end of the locking member 326 is also provided with a protrusion 306. The protrusion 306 is used to prevent the locking member 326 from disengaging from the limiting post 304 and the side wall of the groove 303. Optionally, the recovery shaft assembly 32 also includes a torsion spring 327. One torsion arm of the torsion spring 327 is connected to the locking disc 325. The torsion spring 327 is held tightly on the recovery shaft 321. When the ratchet 301 and pawl 302 engage and drive the locking disc 325 to rotate, the recovery shaft 321 is driven to rotate through the torsion spring 327. When the tension on the recovery shaft 321 is too great when it rewinds the ribbon, the inner diameter of the torsion spring 327 increases and will loosen the recovery shaft 321. The recovery shaft 321 is disconnected from the locking disc 325 to prevent the ribbon from breaking.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A thermal transfer printer, characterized in that, The system includes a frame (1), a printing mechanism (2), a ribbon mechanism (3), a transmission assembly (4), and a motor (5). The printing mechanism (2) includes a rubber roller (21), a printhead assembly (22), a first elastic element (23), and a lifting assembly (24). The rubber roller (21) is rotatably mounted on the frame (1). The printhead assembly (22) includes a movable frame (221) and a printhead (222) mounted on the movable frame (221). The movable frame (221) is movably connected to the frame (1). The movable frame (221) has a depressed position and a lifted position relative to the frame (1). When the movable frame (221) is in the depressed position, The print head (222) engages with the rubber roller (21), and when the movable frame (221) is in the raised position, the print head (222) separates from the rubber roller (21); the first elastic element (23) is configured to always have a tendency to move the movable frame (221) toward the pressed position; the lifting assembly (24) is used to drive the movable frame (221) to the raised position; the ribbon mechanism (3) includes a dispensing shaft assembly and a take-up shaft assembly (32), the dispensing shaft assembly including a dispensing shaft (311) for supporting unused ribbon, and the take-up shaft assembly (32) including a take-up shaft (321) for winding used ribbon; The motor (5) is connected to the transmission assembly (4). The transmission assembly (4) is selectively connected to the lifting assembly (24) and the recovery shaft (321). When the transmission assembly (4) is connected to the lifting assembly (24), the transmission assembly (4) transmits the power output by the motor (5) to the lifting assembly (24) so ​​that the lifting assembly (24) drives the movable frame (221) to the lifting position. When the transmission assembly (4) is connected to the recovery shaft (321), the transmission assembly (4) transmits the power output by the motor (5) to the recovery shaft (321) so that the recovery shaft (321) rotates to rewind the ribbon.

2. The thermal transfer printer according to claim 1, characterized in that, The transmission assembly (4) includes a first support shaft (41), a first gear (42), a second gear (43), and a swing member (44). The first support shaft (41) is fixedly connected to the frame (1). The first gear (42) is driven by the motor (5) and can rotate around the axis of the first support shaft (41). The swing member (44) is sleeved on the first support shaft (41) and can rotate around the axis of the first support shaft (41). The swing member (44) is frictionally connected to the first gear (42) and there is a preset friction force between them. The preset friction force is configured such that when the first gear (42) rotates, it can drive the swing member (44) to rotate, and when the swing member (44) is subjected to When the resistance is greater than the preset friction force, the swing member (44) slips relative to the first gear (42); the second gear (43) is mounted on the swing member (44) and is driven by the first gear (42). When the output shaft of the motor (5) rotates in the forward direction, the first gear (42) drives the swing member (44) to rotate in the first direction, so that the second gear (43) is driven by the lifting assembly (24); when the output shaft of the motor (5) rotates in the reverse direction, the first gear (42) drives the swing member (44) to rotate in the second direction, so that the second gear (43) is driven by the recovery shaft (321), wherein the first direction is opposite to the second direction.

3. The thermal transfer printer according to claim 2, characterized in that, The axial end face of the first gear (42) is in frictional connection with the axial end face of the swing member (44), or the radial circumferential surface of the first gear (42) is in frictional connection with the radial circumferential surface of the swing member (44).

4. The thermal transfer printer according to claim 3, characterized in that, When the radial circumferential surface of the first gear (42) is in frictional connection with the radial circumferential surface of the swing member (44), the first gear (42) includes a first sleeve (421), and the swing member (44) includes a second sleeve (441). The first sleeve (421) is sleeved on the first support shaft (41), and the second sleeve (441) is sleeved on the first sleeve (421). The inner circumferential surface of the second sleeve (441) is in frictional connection with the outer circumferential surface of the first sleeve (421). Alternatively, the second sleeve (441) is sleeved on the first support shaft (41), and the first sleeve (421) is sleeved on the second sleeve (441). The inner circumferential surface of the first sleeve (421) is in frictional connection with the outer circumferential surface of the second sleeve (441).

5. The thermal transfer printer according to claim 4, characterized in that, When the first sleeve (421) is fitted onto the second sleeve (441), the first sleeve (421) is provided with at least two first opening slots spaced apart along its circumferential direction, each of the first opening slots extending along the axial direction of the first sleeve (421); or, when the second sleeve (441) is fitted onto the first sleeve (421), the second sleeve (441) is provided with at least two second opening slots (401) spaced apart along its circumferential direction, each of the second opening slots (401) extending along the axial direction of the second sleeve (441).

6. The thermal transfer printer according to claim 2, characterized in that, The frame (1) includes a fixed frame (12) and a rotating shaft (13) supported by the fixed frame (12); the movable frame (221) is sleeved on the rotating shaft (13) and can rotate around the rotating shaft (13) to the raised position and the pressed position; the lifting assembly (24) includes a camshaft (241), a cam (242) and a cam gear (243), the camshaft (241) is rotatably supported by the frame (1), and the cam (242) and the cam gear (243) are both fixedly sleeved. Located on the camshaft (241), the cam gear (243) is used to mesh with the second gear (43). When the second gear (43) is connected to the lifting assembly (24) in a transmission manner, the second gear (43) meshes with the cam gear (243). The motor (5) drives the camshaft (241) to drive the cam (242) to rotate, so that the cam (242) abuts against the movable frame (221) and drives the movable frame (221) to rotate to the lifting position.

7. The thermal transfer printer according to claim 6, characterized in that, The camshaft (241) is provided with a first limiting surface (206) and a second limiting surface (207), both of which are parallel to and spaced apart from the axis of the camshaft (241); the lifting assembly (24) further includes a limiting member (244) and a second elastic member (245), the limiting member (244) being movably connected to the frame (1), the limiting member (244) being able to move relative to the frame (1), and the limiting member (244) including a blocking surface (208); the The second elastic element (245) is connected to the limiting element (244). The second elastic element (245) is configured to apply a second elastic force to the limiting element (244). When the cam (242) drives the movable frame (221) to the raised position, the second elastic force causes the blocking surface (208) to abut against the first limiting surface (206). When the cam (242) separates from the movable frame (221), the second elastic force causes the blocking surface (208) to abut against the second limiting surface (207).

8. The thermal transfer printer according to claim 6, characterized in that, The fixed frame (12) includes a first wall (121), a second wall (122), and a third wall (123) connected at an angle in sequence. The third wall (123) is opposite to the first wall (121), and the second wall (122) is provided with a clearance groove (101). The movable frame (221) includes a first plate (201), a second plate (202), and a third plate (203) connected at an angle in sequence. The third plate (203) passes through the clearance groove (101) between the first wall (121) and the third wall (123), so that the first... The plate (201) is opposite to the first wall (121), and the print head (222) is fixed on the side of the first plate (201) away from the third plate (203). The first elastic element (23) is a compression spring, and the compression spring is connected between the first plate (201) and the first wall (121). The cam (242) is located between the third plate (203) and the first wall (121). When the cam (242) rotates, it can abut against the third plate (203) to drive the movable frame (221) to rotate to the raised position.

9. The thermal transfer printer according to any one of claims 1 to 8, characterized in that, The recovery shaft assembly (32) further includes a second support shaft (322), a ribbon gear (323), and a ratchet and pawl mechanism (324). The second support shaft (322) is fixedly mounted on the frame (1). The ribbon gear (323) and the recovery shaft (321) are rotatably mounted on the second support shaft (322). The ribbon gear (323) is used for transmission connection with the transmission assembly (4). The ratchet and pawl mechanism (324) includes a ratchet (301) and a pawl (301). 302), one of the ratchet (301) and the pawl (302) is connected to the ribbon gear (323), and the other of the ratchet (301) and the pawl (302) is connected to the take-up shaft (321). When the transmission assembly (4) is connected to the ribbon gear (323) and drives the ribbon gear (323) to rotate, the pawl (302) meshes with the ratchet (301) and drives the take-up shaft (321) to rotate to rewind the ribbon.

10. The thermal transfer printer according to any one of claims 1 to 8, characterized in that, The recycling shaft assembly (32) further includes a second support shaft (322), a ribbon gear (323), a locking disc (325), a locking element (326), and a ratchet and pawl mechanism (324). The second support shaft (322) is fixedly mounted on the frame (1). The ribbon gear (323) and the recycling shaft (321) are rotatably mounted on the second support shaft (322). The ribbon gear (323) is used for transmission connection with the transmission assembly (4). The locking disc (325) is frictionally connected to the recycling shaft (321). The locking element (326) is connected to the ribbon gear (323). The end face is rotatably connected. The ratchet and pawl mechanism (324) includes a ratchet (301) and a pawl (302). The ratchet (301) is fixedly connected to the locking disc (325), and the pawl (302) is fixedly connected to the locking member (326). When the transmission assembly (4) is connected to the ribbon gear (323) and drives the ribbon gear (323) to rotate, the ribbon gear (323) drives the pawl (302) to mesh with the ratchet (301). The ratchet (301) drives the take-up shaft (321) to rotate through the locking disc (325) to rewind the ribbon.

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