Thermal transfer printer

Abstract

The invention discloses a thermal transfer printer. The printer comprises a winding and unwinding shaft component, a printing head pressing component, a printing head component, a printing channel component and a printing head jacking component. The winding and unwinding shaft part is used for installing a ribbon cartridge and driving a ribbon to realize winding and unwinding actions; the printing head pressing part is used for pressing the printing head part above the colored tape and the printing medium, and the printing head jacking part is used for jacking the printing head part, so that the colored tape is separated from the printing medium. The color tape and the printing medium can be synchronously conveyed during normal printing, the color tape and the printing medium are separated when no printing content exists, the printing medium is independently conveyed, the color tape is not moved, the purpose of saving the color tape is achieved, and cost is reduced. In addition, through the arrangement of a middle partition plate in the printing channel component, free conversion between a single channel and double channels can be ingeniously achieved, the problems of double-channel printing of narrow and small printing media and single-channel printing of wide and large printing media are solved, the printing efficiency is greatly improved, and the application range of the printer is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, in particular to a thermal transfer printer. Background Art

[0002] At present, the existing thermal transfer printers are all in the process of printing when the printing medium and the ribbon are synchronously transported, that is, the thermal transfer of the printed content is achieved during the process of the printing medium and the ribbon being synchronously transported. This results in the ribbon still being transported when there is no printing content, resulting in low ribbon utilization and a large amount of ribbon waste.

[0003] Furthermore, existing thermal transfer printers all use a single channel to transmit the print medium and can only print one piece of print medium at a time, resulting in low printing efficiency and long printing time.

[0004] It can be seen that the above existing thermal transfer printers still have inconveniences and defects in structure, method and use, and are in urgent need of further improvement. How to create a new thermal transfer printer that can overcome the problem of serious ribbon waste, realize the conversion between single channel and dual channel, meet the high efficiency of dual channel printing of narrow consumables, and take into account the printing needs of wide consumables has become a goal that the current industry urgently needs to improve. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a thermal transfer printer that can overcome the problem of serious ribbon waste, realize the conversion between single channel and dual channel, meet the high efficiency of dual channel printing of narrow consumables, and take into account the printing requirements of large consumables, thereby overcoming the shortcomings of existing thermal transfer printers.

[0006] In order to solve the above technical problems, the present invention provides a thermal transfer printer, comprising a frame and a main vertical plate arranged on one side thereof, wherein the main vertical plate is provided with a retractable reel component, a print head pressing component, a print head component, a print channel component and a print head lifting component in sequence from top to bottom.

[0007] The reel component is used to install the ribbon cassette and drive the ribbon to realize the reeling and unreeling action, and the ribbon drawn out of the ribbon cassette is located between the print head component and the print channel component;

[0008] The print head component includes a print head support shaft, a print head bracket, a thermal print head, a return spring and a return paddle. The print head support shaft is rotatably installed through the main vertical plate. The print head bracket is installed at the front end of the main vertical plate, and the return spring and the return paddle are installed at the rear end of the main vertical plate. The print head bracket can rotate with the print head support shaft, and the thermal print head is fixed to the free rotating end of the print head bracket.

[0009] The print head pressing component includes a pressing rotating shaft, a pressing handle, a pressing bracket, and a telescopic pressing end. The pressing rotating shaft is rotatably installed through the main vertical plate. The pressing handle and the pressing bracket are installed on the part of the main vertical plate at the front end. The telescopic pressing end is installed on the pressing bracket. When an external force acts on the pressing handle, it drives the pressing rotating shaft and the pressing bracket to rotate, and then drives the telescopic pressing end to rotate. When the telescopic pressing end rotates downward, it abuts against the print head bracket of the print head component, prompting the print head bracket to rotate downward until the heating surface of the thermal print head presses against the ribbon and the printing medium. When the telescopic pressing end rotates upward, it disengages from the print head bracket, and the print head bracket returns upward under the action of the return spring and the return shift piece.

[0010] The print channel component is used to provide a channel for the printing medium and prompt the transmission of the printing medium. It includes a channel support fixed to the lower part of the main vertical plate.

[0011] The print head lifting component includes a camshaft, a cam provided thereon, a power gear provided at the end of the camshaft, and a push rod assembly disposed opposite to the cam. The camshaft is installed at the bottom of the front and rear side walls of the channel support through a bushing. The push rod assembly is vertically defined inside the side wall of the channel support and can slide up and down. The lower end of the push rod assembly contacts the cam surface of the cam, and its upper end contacts the bottom of the print head bracket. When the cam rotates driven by the power gear, it can drive the push rod assembly to slide upward, and then lift the print head bracket within the telescopic range of the telescopic pressing end, prompting the ribbon to separate from the printing medium. At this time, the printing medium continues to be transmitted, and the ribbon stops being transmitted, achieving the purpose of saving the ribbon.

[0012] Further improvement, the telescopic pressing end includes a hemispherical end, a pressing spring, an adjusting knob, and a central shaft. The lower end of the central shaft is fixedly connected to the upper end of the hemispherical end. The upper end of the central shaft extends into the lower central step hole of the pressing bracket, and an expansion part is provided at the upper end of the central shaft to prevent the central shaft from disengaging from the central step hole. The inner upper part of the adjusting knob is provided with an internal thread for connecting with the external thread at the lower part of the pressing bracket. The inner lower part of the adjusting knob is provided with a counterbore for the upper end of the pressing spring to abut against. The lower end of the pressing spring is connected to the upper end surface of the hemispherical end. Then the hemispherical end can elastically expand and contract under the action of the pressing spring, and the adjusting knob can adjust the tightness of the pressing spring.

[0013] For further improvement, the printing head lifting component includes two cams and two ejector rod assemblies respectively corresponding thereto. The two ejector rod assemblies are respectively vertically defined inside the front and rear side walls of the channel support, and a rolling bearing in contact with the cam surface is provided at the bottom end of the ejector rod assembly.

[0014] For further improvement, the printing channel component further includes a feeding rubber roller assembly, a printing rubber roller assembly, and a discharging rubber roller assembly installed on the upper part of the channel support, as well as two floating rubber roller assemblies and a sliding assembly installed on the main vertical plate;

[0015] The feeding rubber roller assembly, the printing rubber roller assembly, and the discharging rubber roller assembly all include rubber roller shafts arranged in parallel with each other and gears meshing with each other fixed at the ends of the rubber roller shafts, for realizing synchronous transmission of the printing medium;

[0016] The floating rubber roller assembly includes a support shaft, a floating plate, a long shaft, and a floating torsion spring. The support shaft is fixed on the main vertical plate. The floating plate is rotatably installed on the support shaft. The long shaft is installed at the floating end of the floating plate. The floating torsion spring is sleeved on the support shaft. One end of the floating torsion spring is fixed to the support shaft, and the other end is in contact with the floating plate and urges the floating plate to press down; the two floating rubber roller assemblies are symmetrically arranged above the feeding rubber roller assembly and the discharging rubber roller assembly respectively;

[0017] The sliding assembly includes a sliding plate, a slide plate support shaft, and a rack. At least two ramp grooves are provided on the upper end surface of the sliding plate. Floating shafts extending into the ramp grooves are provided on both of the two floating plates. At least two long slots are further provided in the middle of the sliding plate. The slide plate support shaft is arranged in the long slots. The other end of the sliding support shaft is fixed on the main vertical plate. One end of the rack is fixedly connected to the sliding plate, and the other end is provided with teeth. When the teeth move horizontally under the action of an external force, the sliding plate is driven to move horizontally along the long slots, and then the two floating plates are lifted or lowered under the action of the ramp grooves. When lifted, it is for installing the printing medium, and when lowered, the printing medium is pressed tightly.

[0018] For further improvement, the printing channel component further includes a centering clamping assembly. The centering clamping assembly includes a threaded shaft and guide shafts on both sides thereof, as well as two clamping plates perpendicularly connected to the threaded shaft and the guide shafts;

[0019] The threaded shaft adopts a double-threaded shaft, and its two ends are respectively rotatably mounted on the front and rear side walls of the channel support. The end extending out of the channel support is provided with a threaded shaft knob;

[0020] The guiding shaft includes a first guiding shaft and a second guiding shaft, which are respectively rotatably mounted on the front and rear side walls of the channel support, and a first knob and a second knob are respectively provided at the end portions extending out of the channel support;

[0021] The clamping plates are provided with through holes corresponding to the threaded shaft, the first guiding shaft and the second guiding shaft respectively. At the through hole corresponding to the threaded shaft, a threaded sleeve meshing with the thread of the threaded shaft is provided. The threaded sleeves on the two clamping plates respectively correspond to the double threads of the threaded shaft, and at least two clamping columns are provided on the upper portions of the two clamping plates. By rotating the threaded shaft knob, the threaded shaft is driven to rotate, and the two clamping plates move towards or away from each other under the action of the double threads, so as to adjust the distance between the clamping columns on the two clamping plates according to the width of the printing medium.

[0022] Further improvement, the center clamping assembly further includes an intermediate partition plate located between the two clamping plates. One end of the intermediate partition plate is rotatably arranged on the first guiding shaft. Avoidance grooves for the threaded shaft and the second guiding shaft to pass through are respectively provided in the middle of the intermediate partition plate. The bottom of the other end of the intermediate partition plate is connected with a pull ring, and the upper end of the pull ring is fixed on the side wall of the channel support. A horizontal flanging is provided at the bottom of the intermediate partition plate, and a separating column is provided at the upper portion of the intermediate partition plate. A rotating convex block is fixed in the middle of the second guiding shaft, and the free end of the rotating convex block abuts against the horizontal flanging. By rotating the second knob, the second guiding shaft is driven to rotate, and the rotating convex block presses down the horizontal flanging, thereby driving the intermediate partition plate to rotate downward, so that the intermediate partition plate does not affect the installation and transmission of the printing medium between the two clamping plates. At this time, the printer is in single-channel printing; after reversely rotating the second knob, the rotating convex block does not press the horizontal flanging, and the intermediate partition plate rotates upward under the action of the pull ring, and the separating columns are flush with the clamping columns on both sides to form a double channel. At this time, the printer is in double-channel printing.

[0023] Further improvement, a sliding gear is provided at the end of the first guiding shaft away from the first knob, and the sliding gear meshes with the teeth of the rack. By rotating the first knob, the rack can be driven to move horizontally.

[0024] For further improvement, the printing channel component further includes a driving assembly disposed at the rear end of the main vertical plate. The driving assembly includes a mounting plate, a main motor and a sub-motor disposed on the mounting plate. The output shafts of the main motor and the sub-motor both pass through the mounting plate. The mounting plate is further provided with a first reduction gear and a second reduction gear respectively meshing with the output gears at the ends of the output shafts of the main motor and the sub-motor. The first reduction gear also meshes with the gear in the printing rubber roller assembly for conveying the printing medium. The second reduction gear also meshes with the power gear in the printing head lifting component for realizing the function of saving the ribbon.

[0025] For further improvement, the rewinding and unwinding reel component includes a rewinding reel assembly, an unwinding reel assembly and a rewinding driving assembly. The rewinding reel assembly includes a rewinding metal shaft, a rewinding gear, a first damping spring and a first shaft sleeve. The rewinding metal shaft is rotatably mounted on the main vertical plate. The rewinding gear is mounted on the part located at the rear end of the main vertical plate. The first damping spring and the first shaft sleeve are mounted on the part located at the front end of the main vertical plate. The first shaft sleeve can rotate around the rewinding metal shaft under the action of the first damping spring.

[0026] The unwinding reel assembly includes an unwinding metal shaft, a second damping spring and a second shaft sleeve. One end of the unwinding metal shaft is fixed on the main vertical plate, and the second damping spring and the second shaft sleeve are mounted on the other end. The second shaft sleeve can rotate around the unwinding metal shaft under the action of the second damping spring.

[0027] The rewinding driving assembly includes a rewinding driving motor and a rewinding reduction gear. The output gear of the rewinding driving motor meshes with the rewinding reduction gear, and the rewinding reduction gear meshes with the rewinding gear to realize the rewinding and unwinding actions.

[0028] For further improvement, the printer further includes a pre-feed tube module mounted on the frame. The pre-feed tube module includes a support frame and an active rubber roller shaft, a swing shaft, a photoelectric induction shaft, a photoelectric plate and a power motor provided thereon. The active rubber roller shaft is rotatably fixed on the support frame, one end thereof is in roller contact with the swing shaft, and the other end is provided with a rubber roller gear. The rubber roller gear is engaged with the output shaft of the power motor. The swing shaft is rotatably arranged on the support frame through a swing plate and is pressed against the active rubber roller shaft by a first torsion spring. One end of the photoelectric induction shaft is rotatably installed on the support frame, and the other end is suspended through an induction plate. The photoelectric plate is arranged on the support frame and can form a signal induction with the induction plate of the photoelectric induction shaft. The suspended end of the photoelectric induction shaft is pressed below the upper end surface of the active rubber roller shaft by a second torsion spring. After the printing medium passes between the active rubber roller shaft and the swing shaft, it passes below the suspended end of the photoelectric induction shaft and then enters the printing channel component upward. When the printing medium is consumed and tightened, the printing medium drives the suspended end of the photoelectric induction shaft to gradually rise. When the photoelectric plate senses the induction plate, the power motor is triggered to start, realizing the pre-feed of the printing medium.

[0029] After adopting such a design, the present invention has at least the following advantages:

[0030] 1. Through the settings of the print head component, the print head pressing component, the printing channel component and the print head lifting component, the thermal transfer printer of the present invention can realize the synchronous transmission of the ribbon and the printing medium during normal printing. When there is no printing content, through the cooperation of the print head lifting component and the print head pressing component, the separation of the ribbon and the printing medium can be realized. At this time, the printing medium continues to be transmitted while the ribbon remains stationary, achieving the purpose of saving the ribbon, reducing costs, and solving the problem that the ribbon has to be transmitted together with the printing medium in the places where the current printer does not print content, resulting in the ribbon not being utilized and being wasted after winding.

[0031] 2. Also through the settings of the floating rubber roller assembly and the sliding assembly in the printing channel component, the lifting and pressing of the floating rubber roller assembly can be easily realized, meeting the installation and transmission requirements of the printing medium.

[0032] 3. Also through the setting of the centering clamping component, the printing requirements of different printing media can be met, avoiding the skew of the printing medium during transmission and ensuring the printing quality.

[0033] 4. Also through the setting of the intermediate partition, the free conversion between the single-channel and the double-channel can be cleverly realized, solving the problem of double-channel printing for narrow printing media and single-channel printing for wide printing media. The printing efficiency for narrow consumables can be greatly improved, and at the same time, the application of wide consumables can be taken into account, expanding the applicable range of the printer.

[0034] 5. The setting of the pre-feeding tube module can also achieve the pre-feeding function of the printing medium. Especially for printing media with strong elasticity and large winding force, it can be used to pre-feed the printing medium a certain distance during the printing process, ensuring that the printing medium always remains in a relaxed state and there is no phenomenon of the printing medium being dragged during the printing process, thus guaranteeing the printing quality. Brief Description of the Drawings

[0035] The above is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, the following further detailed description of the present invention will be given in conjunction with the drawings and specific embodiments.

[0036] Figure 1 It is a schematic diagram of the overall internal structure of the thermal transfer printer of the present invention.

[0037] Figure 2 It is a front view structural schematic diagram of the main vertical plate in the thermal transfer printer of the present invention.

[0038] Figure 3 It is a rear view structural schematic diagram of the main vertical plate in the thermal transfer printer of the present invention.

[0039] Figure 4 It is a top view structural schematic diagram of the main vertical plate in the thermal transfer printer of the present invention.

[0040] Figure 5 It is a structural schematic diagram of the print head component in the thermal transfer printer of the present invention.

[0041] Figure 6 It is a structural schematic diagram of the print head pressing component in the thermal transfer printer of the present invention.

[0042] Figure 7 It is a structural schematic diagram of the print channel component in the thermal transfer printer of the present invention.

[0043] Figure 8 It is a structural schematic diagram of the print channel component in the thermal transfer printer of the present invention.

[0044] Figure 9 It is a structural schematic diagram of the feeding rubber roller assembly in the thermal transfer printer of the present invention.

[0045] Figure 10 It is a structural schematic diagram of the printing rubber roller assembly in the thermal transfer printer of the present invention.

[0046] Figure 11 It is a structural schematic diagram of the discharging rubber roller assembly in the thermal transfer printer of the present invention.

[0047] Figure 12 It is a structural schematic diagram of the floating rubber roller assembly and the sliding assembly in the thermal transfer printer of the present invention.

[0048] Figure 13 It is a schematic structural diagram of the print head lifting component in the thermal transfer printer of the present invention.

[0049] Figure 14 It is a schematic structural diagram of the print head lifting component in the thermal transfer printer of the present invention.

[0050] Figure 15 It is a schematic structural diagram of the centering and clamping component in the thermal transfer printer of the present invention.

[0051] Figure 16 It is a schematic structural diagram of the middle partition plate in the thermal transfer printer of the present invention.

[0052] Figure 17 It is a schematic structural diagram of the rotating bump in the thermal transfer printer of the present invention.

[0053] Figure 18 It is a schematic structural diagram of the driving component in the thermal transfer printer of the present invention.

[0054] Figure 19 It is a schematic structural diagram of the pre-feed tube component in the thermal transfer printer of the present invention.

[0055] Figure 20 It is a partial schematic structural diagram of the pre-feed tube component in the thermal transfer printer of the present invention. Detailed implementation manners

[0056] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0057] The thermal transfer printer of the present invention is a machine that realizes thermal transfer printing of a print medium through a thermal print head and a ribbon. The print medium can be, but is not limited to, heat shrinkable tubes, sleeves, stickers, signs, etc.

[0058] Referring to the attached Figure 1 As shown, the thermal transfer printer of this embodiment includes a frame 1 and a main vertical plate 2 provided on one side of the frame 1. The main vertical plate 2 is successively provided with a winding and unwinding reel component 3, a print head pressing component 5, a print head component 6, a print channel component 7, a cutter module 8, a pre-feed tube module 9, and a print head lifting component 10 from top to bottom.

[0059] Among them, the frame 1 is made of sheet metal and is mainly used for installing and supporting the main modules and the outer shell of the printer; the main vertical plate 2 is made of cast aluminum and is fixed on the frame 1; the ribbon reel component 3, the print head pressing component 5, the print head component 6 and the print channel component 7 are all installed and fixed on the main vertical plate 2; the ribbon reel component 3 is used for installing the ribbon cartridge 4 and driving the ribbon to perform the winding and unwinding actions; the cutting knife module 8 is installed at the outlet position of the print channel component 7 and is used for cutting the printing medium; the pre-feed tube module 9 is installed on the frame 1. It should be noted that in this embodiment, the ribbon cartridge 4 and the cutting knife module 8 can both adopt existing structures. The ribbon cartridge 4 is installed on the ribbon reel when printing is required, and the ribbon drawn out thereof is located between the print head component 6 and the print channel component 7; the cutting knife module 8 can perform half-cutting or full-cutting.

[0060] More specifically, referring to the attached Figures 2 to 4 As shown, the ribbon reel component 3 includes a take-up reel assembly 31, a pay-off reel assembly 32 and a take-up drive assembly 33. The take-up reel assembly 31 includes a take-up metal shaft 311, a take-up gear 312, a first damping spring 313 and a first bushing 314. The take-up metal shaft 311 is rotatably installed on the main vertical plate 2. The take-up gear 312 is installed on the part located at the rear end of the main vertical plate 2, and two first damping springs 313 and two first bushings 314 are installed on the part located at the front end of the main vertical plate 2. The first bushing 314 can rotate around the take-up metal shaft 311 under the action of the first damping spring 313. The entire take-up reel assembly 3 can freely rotate in the mounting hole of the main vertical plate 2.

[0061] The pay-off reel assembly 32 includes a pay-off metal shaft 321, a second damping spring 322 and a second bushing 323. One end of the pay-off metal shaft 321 is fixed on the main vertical plate 2 and cannot rotate. Two second damping springs 322 and two second bushings 323 are installed at the other end. The second bushing 323 can rotate around the pay-off metal shaft 321 under the action of the second damping spring 322.

[0062] The take-up drive assembly 33 is installed behind the main vertical plate 2 and includes a take-up drive motor 331 and a take-up reduction gear 332. The output gear 333 of the take-up drive motor 331 meshes with the take-up reduction gear 332, and the take-up reduction gear 332 also meshes with the take-up gear 312 to realize the winding and unwinding actions. The take-up reduction gear 332 adopts a double-layer gear.

[0063] Referring to the attached Figure 5As shown in the figure, in this embodiment, the print head assembly 6 includes a print head support shaft 61, a print head bracket 62, a thermal print head 63, a return spring 64, and a return flap 65. The print head support shaft 61 is rotatably installed through the main vertical plate 2. The print head bracket 62 is installed on the part of the main vertical plate 2 at the front end, and the return spring 64 and the return flap 65 are installed on the part of the main vertical plate 2 at the rear end. The print head bracket 62 can rotate with the print head support shaft 64, and the thermal print head 63 is fixed at the free rotation end of the print head bracket 62.

[0064] Refer to the attached Figure 6 As shown in the figure, the print head pressing assembly 5 includes a pressing rotation shaft 51, a pressing handle 52, a pressing bracket 53, a telescopic pressing end 54, and a sensor flap 55. The pressing rotation shaft 51 is rotatably installed through the main vertical plate 2. The pressing handle 52 and the pressing bracket 53 are installed on the part of the main vertical plate 2 at the front end, and the telescopic pressing end 54 is installed on the pressing bracket 53. The sensor flap 55 is installed on the part of the main vertical plate 2 at the rear end. When the pressing handle 52 is driven by an external force, it drives the pressing rotation shaft 51 and the pressing bracket 53 to rotate, and then drives the telescopic pressing end 54 to rotate. When the telescopic pressing end 54 rotates downward, it abuts against the print head bracket 62 of the print head assembly 6, causing the print head bracket 62 to rotate downward until the heating surface of the thermal print head 63 presses against the ribbon and the printing medium. At this time, the sensor flap 55 obtains a signal, and the printer can start printing; when the telescopic pressing end 54 rotates upward, it disengages from the print head bracket 62, and the print head bracket 62 returns upward under the action of the return spring 64 and the return flap 65. At this time, it can be used to install the ribbon cassette 4.

[0065] Among them, the telescopic pressing end 54 of this embodiment includes a hemispherical end 541, a pressing spring 542, an adjustment knob 543, and a central shaft 544. The lower end of the central shaft 544 is fixedly connected to the upper end of the hemispherical end 541. The upper end of the central shaft 544 extends into the lower central step hole of the pressing bracket 53, and an expansion part is provided at the upper end of the central shaft 544 to prevent the central shaft 544 from disengaging from the central step hole. The inner upper part of the adjustment knob 543 is provided with internal threads for connecting with the external threads at the lower part of the pressing bracket 53. The inner lower part of the adjustment knob 543 is provided with a counterbore for the upper end of the pressing spring 542 to abut against, and the lower end of the pressing spring 542 is connected to the upper end surface of the hemispherical end 541. Then the hemispherical end 541 can elastically expand and contract under the action of the pressing spring 542, providing favorable conditions for the function of saving the ribbon. Moreover, the adjustment knob 543 can adjust the tightness of the pressing spring 542 to meet the pressing and elastic expansion and contraction requirements of the telescopic pressing end.

[0066] In this embodiment, the printing channel component 7 is used to provide a channel for the printing medium and promote the conveyance of the printing medium.

[0067] Refer to the appendix Figure 7 and 8 As shown, the printing channel component 7 includes a channel support 71, a feeding rubber roller assembly 72, a printing rubber roller assembly 73, and a discharging rubber roller assembly 74 mounted on the upper part of the channel support 71, as well as two floating rubber roller assemblies 75, 76 and a sliding assembly 77 mounted on the main vertical plate 2. The channel support 71 is a cast aluminum part with a square structure and is fixed to the lower part of the main vertical plate 2.

[0068] Refer to the appendix Figures 9 to 11 As shown, the feeding rubber roller assembly 72, the printing rubber roller assembly 73, and the discharging rubber roller assembly 74 each include rubber roller shafts 721, 731, 741 arranged parallel to each other and gears 722, 732, 742 engaged with each other fixed to the ends of the rubber roller shafts, for realizing the synchronous conveyance of the printing medium. The rubber roller shafts 721, 731, 741 are all installed on the front and rear side walls of the channel support 71 through bushings.

[0069] Refer to the appendix Figure 12 As shown, the floating rubber roller assembly 75 includes a support shaft 751, a floating plate 752, a long shaft 753, and a floating torsion spring 754. The support shaft 751 is fixed to the main vertical plate 2. The floating plate 752 is rotatably installed on the support shaft 751. The long shaft 753 is installed at the floating end of the floating plate 752. There are two floating torsion springs 754, sleeved on the support shaft 751. One end of the floating torsion spring 754 is fixed to the support shaft 751, and the other end contacts the floating plate 752 and urges the floating plate 752 to press down. The floating rubber roller assembly 76 is symmetrically arranged with the floating rubber roller assembly 75 above the feeding rubber roller assembly 72 and the discharging rubber roller assembly 74.

[0070] The sliding assembly 77 includes a sliding plate 771, a skateboard support shaft 772, and a rack 773. At least two ramp grooves 774 are provided on the upper end surface of the sliding plate 771. Floating shafts 755 extending into the ramp grooves 774 are provided on both of the two floating plates 752. At least two long holes 775 are further provided in the middle of the sliding plate 771. The skateboard support shaft 772 is arranged in the long holes 775. The other end of the sliding support shaft 772 is fixed to the main vertical plate 2. One end of the rack 773 is fixedly connected to the sliding plate 771, and the other end is provided with external power teeth. When the teeth horizontally move under the action of a sliding gear 7822 on the following first guiding shaft 782, the sliding plate 771 can be driven to horizontally move along the long holes 775. The structure of the long holes 775 and the skateboard support shaft 772 ensures that the sliding plate 771 can only move horizontally. Then, the two floating plates 752 are lifted or lowered under the action of the ramp grooves 774. When lifted, it is for installing the printing medium, and when lowered, the printing medium is pressed tightly.

[0071] Referring to the attached Figure 13 and 14 As shown, in this embodiment, the print head lifting component 10 includes a camshaft 101 and cams 102 provided thereon, a power gear 103 provided at the end of the camshaft 101, and a push rod assembly 104 arranged opposite to the cam 102. The camshaft 101 is installed on the bottom of the front and rear side walls of the channel support 71 through a bushing, and two cams 102 are provided thereon. The push rod assembly 104 also includes two, which are respectively vertically defined inside the front and rear side walls of the channel support 71 and can both slide up and down. The lower end of the push rod assembly 104 contacts the cam surface of the cam 102. Preferably, a rolling bearing 105 is provided, which is beneficial for the rolling contact between the two. The upper end of the push rod assembly 104 contacts the bottom of the print head bracket 6. Then, when the cam 102 rotates driven by the power gear 103, the push rod assembly 104 can be driven to slide upward, and then the print head bracket 62 can be lifted within the telescopic range of the telescopic pressing end 54, prompting the ribbon to be separated from the printing medium. At this time, the printing medium continues to be conveyed while the ribbon stops being conveyed, achieving the purpose of saving the ribbon.

[0072] Also, referring to the attached Figure 15 As shown, the print channel component 7 in this embodiment further includes a centering clamping assembly 78. The centering clamping assembly 78 includes a threaded shaft 781 and guiding shafts on both sides thereof, and two clamping plates 784, 785 perpendicularly connected to the threaded shaft and the guiding shafts;

[0073] The threaded shaft 781 is a bidirectional threaded shaft, and its two ends are respectively rotatably mounted on the front and rear side walls of the channel support 71. The end thereof extending out of the channel support 71 is provided with a threaded shaft knob 7811;

[0074] The guiding shaft includes a first guiding shaft 782 and a second guiding shaft 783, which are respectively rotatably mounted on the front and rear side walls of the channel support 71, and the end parts extending out of the channel support 71 are respectively provided with a first knob 7821 and a second knob 7831.

[0075] The clamping plates 784 and 785 are both provided with through holes corresponding to the threaded shaft 781, the first guiding shaft 782 and the second guiding shaft 783 respectively, and a threaded sleeve meshing with the thread of the threaded shaft 781 is provided at the through hole corresponding to the threaded shaft 781. The threaded sleeves on the two clamping plates 784 and 785 respectively correspond to the double threads of the threaded shaft 781, and three clamping columns 7841 and 7851 are provided on the upper parts of the two clamping plates 784 and 785 respectively. By rotating the threaded shaft knob 7811, the threaded shaft 781 is driven to rotate, and the two clamping plates 784 and 785 move towards or away from each other under the action of the double threads, so as to adjust the distance between the clamping columns on the two clamping plates 784 and 785 according to the width of the printing medium.

[0076] Preferably, the centering clamping assembly 78 further includes an intermediate partition plate 786 located between the two clamping plates. Refer to the attached Figure 15 and 16 As shown, one end of the intermediate partition plate 786 is rotatably arranged on the first guiding shaft 782. Avoidance grooves 7861 for the threaded shaft 781 and the second guiding shaft 783 to pass through are respectively provided in the middle of the intermediate partition plate 786. A pull ring 787 is connected to the bottom of the other end of the intermediate partition plate 786, and the upper end of the pull ring 787 is fixed on the side wall of the channel support 71. A horizontal flanging 7862 is provided at the bottom of the intermediate partition plate 786. A separating column 7863 is provided at the upper part of the intermediate partition plate 786. A rotating convex block 7864 is fixed in the middle of the second guiding shaft 783. As shown in the attached Figure 17 figure, the free end of the rotating convex block 7864 abuts against the horizontal flanging 7862. By rotating the second knob 7831, the second guiding shaft 783 is driven to rotate, the rotating convex block 7864 presses down the horizontal flanging 7862, and then drives the intermediate partition plate 786 to rotate downward, so that the intermediate partition plate 786 does not affect the transmission of the printing medium between the two clamping plates 784 and 785. At this time, the printer is in single-channel printing; after the second knob 7831 is rotated in the reverse direction, the rotating convex block 7864 does not press on the horizontal flanging 7862, and the intermediate partition plate 786 rotates upward under the action of the pull ring 787, and the separating columns 7863 are flush with the clamping columns on both sides to form a double channel. At this time, the printer is in double-channel printing.

[0077] In this embodiment, a sliding gear 7822 is provided at the end of the first guiding shaft 782 away from the first knob 7821. The sliding gear 7822 meshes with the teeth of the rack 773. Therefore, rotating the first knob 7821 can drive the rack 773 to move horizontally.

[0078] In this embodiment, the printing channel component 7 further includes a driving assembly 79 provided at the rear end of the main vertical plate 2. Refer to the attached Figure 18 As shown in the figure, the driving assembly 79 includes a mounting plate 791, a main motor 792 and an auxiliary motor 793 provided on the mounting plate 791. The output shafts of the main motor 792 and the auxiliary motor 793 both pass through the mounting plate 791. The mounting plate 791 is further provided with a first reduction gear 796 and a second reduction gear 797 that respectively mesh with the main motor output gear 794 and the auxiliary motor output gear 795. Both the first reduction gear 796 and the second reduction gear 797 are double-layer gears. The first reduction gear 796 also meshes with the gear 732 in the printing rubber roller assembly 73 to realize the transmission of the printing medium. The second reduction gear 797 also meshes with the power gear 103 in the printing head lifting component 10 to realize the function of saving the ribbon.

[0079] Refer to the attached Figure 19 and 20As shown in the figure, the pre-feed tube module 9 in this embodiment includes a support frame 91 and an active rubber roller shaft 92, a swing shaft 93, a photoelectric induction shaft 94, a photoelectric board 95, and a power motor 96 arranged thereon. The active rubber roller shaft 92 is rotatably fixed on the support frame 91, one end of which is in roller contact with the swing shaft 93, and a rubber roller gear 97 is provided at the other end. The rubber roller gear 97 meshes with the output shaft of the power motor 96. The swing shaft 93 is rotatably arranged on the support frame 91 through a swing plate, and is pressed down on the active rubber roller shaft 92 by a first torsion spring 98 for the printing medium to pass through. One end of the photoelectric induction shaft 94 is rotatably installed on the support frame 91, and the other end is suspended through an induction plate 99. The photoelectric board 95 is arranged on the support frame 91 and can form a signal induction with the induction plate 99 of the photoelectric induction shaft 94. The suspended end of the photoelectric induction shaft 94 is pressed down by a second torsion spring below the upper end surface of the active rubber roller shaft 92. Then, after the printing medium passes between the active rubber roller shaft 92 and the swing shaft 93, it passes below the suspended end of the photoelectric induction shaft 94 and then enters the printing channel component 7 upward. When the printing medium is consumed and tightened, the printing medium drives the suspended end of the photoelectric induction shaft 94 to gradually rise. When the photoelectric board 95 senses the induction plate 99, it triggers the power motor 96 to start, realizing the pre-feed of the printing medium. That is, the pre-feed tube module 9 can be used to pre-feed the printing medium a certain distance during the printing process, ensuring that the printing medium always remains in a relaxed state and there will be no phenomenon of the printing medium being dragged during the printing process, thus ensuring the printing quality.

[0080] The pre-feed tube module 9 further includes a guide member 100. The guide member 100 is installed on the support frame 91 and is provided with a guide hole for introducing the printing medium between the active rubber roller shaft 92 and the swing shaft 93.

[0081] The process of installing the ribbon and the print medium in the thermal transfer printer of this embodiment is as follows: when printing is required on the print medium, the ribbon cartridge 4 is first installed, and the clamping handle 52 is rotated counterclockwise. At this time, the print head clamping component 5 rotates, and the retractable clamping end 54 is separated from the print head bracket 62 in the print head component 6. The print head component 6 is driven by the return paddle 65 under the action of the return spring 64, so that the print head component 6 is rotated and lifted around the center of the print head support shaft 61, and then the ribbon cartridge 4 is installed into the retractable reel component 3, and the drawn ribbon is located below the print head component 6. After that, the print medium is installed, and the first knob 7821 is rotated 90° clockwise. The first knob 7821 drives the sliding gear 7822 on the first guide shaft 782 to rotate, and the sliding gear 7822 drives the rack 773 to move linearly. The rack 773 is fixed to the sliding plate 771, and the sliding plate 771 also moves linearly. When the sliding plate 771 moves linearly, the two floating plates are lifted up due to the action of the ramp groove 774. At this time, the channel space is open, and the printing medium is manually placed above the rubber roller shaft 721 in the feeding rubber roller assembly 72, the rubber roller shaft 731 in the printing rubber roller assembly 73, and the rubber roller shaft 741 in the discharging rubber roller assembly 74. Then, the threaded shaft knob 7811 is adjusted to drive the two clamping plates 784 and 785 to move synchronously through the threaded shaft 781, and the clamping columns 7841 and 7851 on the two clamping plates 784 and 785 clamp the printing medium so that the printing medium will not be skewed left and right. Then, rotate the first knob 7821 90° counterclockwise, and the two long axes respectively clamp the printing medium with the rubber roller shaft 721 in the feed rubber roller assembly 72 and the rubber roller shaft 741 in the discharge rubber roller assembly 74. Finally, rotate the clamping handle 52 clockwise, and the retractable clamping end 54 presses the print head component 6 down again until the heating surface of the thermal print head 63 presses the ribbon and the printing medium and is located at the highest point in the center of the rubber roller shaft 731 in the printing rubber roller assembly 73. In this process, the ribbon completely wraps the thermal print head 63, and the ribbon is between the printing medium and the thermal print head 63, and the entire installation process is completed.

[0082] When dual-channel printing of narrow printing media is required, the second knob 7831 is rotated counterclockwise, and the rotating protrusion 7864 rotates with the second guide shaft 783 so that it does not abut against the middle partition 7864. The middle partition 7864 then rotates upward under the action of the pull ring 787, and the partition column 7863 is lifted and located between the clamping columns, forming two printing medium channels. The printing media is clamped by the clamping columns on both sides at the same time, thereby achieving dual-channel printing.

[0083] During the above process, when encountering a printing medium with strong elasticity and large winding force, such as a sleeve, it is necessary to use the pre-feed tube module 9 to ensure that the printing medium will not be stretched and deformed during the entire printing process, thus ensuring the printing quality. The specific operation is as follows: Before installing the printing medium into the printer, the printing medium needs to be passed through the guide 100 and installed between the driving rubber roller shaft 92 and the swing shaft 93 in advance, and then bypassed downward around the photo-electric induction shaft 94. A certain length of the printing medium is pre-fed in advance before printing to make the printing medium in a relaxed state. During the printing process, as the printing medium is consumed, the printing medium drives the photo-electric induction shaft 94 to gradually rise. When the photo-electric induction shaft 94 rises to a certain height, the sensor on the photo-electric plate 95 is triggered. At this time, a certain length of pre-feed needs to be continued, and this process is repeated until the printing task is completed.

[0084] The implementation process of the printing action is as follows: During the printing process, the main motor 792 rotates clockwise. The output gear 794 of the main motor drives the rubber roller shaft 731 in the printing rubber roller assembly 73 to rotate through the first reduction gear 796, and at the same time drives the rubber roller shaft 721 in the feeding rubber roller assembly 72 and the rubber roller shaft 741 in the discharging rubber roller assembly 74 to rotate synchronously. As each rubber roller shaft rotates, the printing medium moves in the discharging direction. At the same time as the main motor 792 starts to drive, the winding drive motor 331 in the winding drive assembly 3 also starts to drive the winding gear 312 to rotate, driving the winding shaft assembly 31 to rotate, and starting the action of winding the color ribbon. Since the operating speed of the winding drive motor 331 is greater than that of the main motor 792, the first damping spring 313 in the winding shaft assembly 31 takes effect to ensure that the color ribbon always moves synchronously with the printing medium, and at the same time the color ribbon is tightened. At this time, the thermal printing head 63 generates heat, and the printing content is hot stamped on the printing medium through the color ribbon to complete the printing. The printing medium continues to be conveyed forward and reaches the cutter module 8, where semi-cutting or full-cutting actions are performed according to requirements.

[0085] When there is a section of the printing medium that does not require printed content, the auxiliary motor 793 in the driving component 79 starts to rotate at this time. The output gear 795 of the auxiliary motor drives the engaged second reduction gear 797 to rotate, and then drives the power gear 103 in the printing head lifting component 10 to engage. The power gear 103 drives the camshaft 101 and the cam 102 to rotate synchronously, and then drives the ejector rod assembly 104 to slide upward to lift the print head bracket 62 by 5 mm. At this time, the thermal print head 63 and the ribbon are separated from the printing medium, and the printing medium can continue to be conveyed forward under the drive of the rubber roller shaft 721 in the feeding rubber roller assembly 72 and the rubber roller shaft 741 in the discharging rubber roller assembly 74. At this time, the winding drive motor 331 in the winding drive component 3 stops working, and the ribbon stops being conveyed, so that the ribbon is saved. When it is necessary to print content on the printing medium again, the auxiliary motor 793 in the driving component 79 starts to rotate in the reverse direction, the ejector rod assembly 104 starts to move downward, and the print head bracket 62 drops downward until the thermal print head 63 presses the ribbon and the printing medium tightly again, and the auxiliary motor 793 stops rotating. At this time, the printing operation can be carried out again.

[0086] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Those skilled in the art can make some simple modifications, equivalent changes or decorations using the technical content disclosed above, and all fall within the protection scope of the present invention.

Claims

1. A thermal transfer printer, characterized in that: The machine comprises a frame and a main vertical plate arranged on one side thereof, wherein the main vertical plate is provided with a reel-retracting and retracting shaft component, a print head pressing component, a print head component, a print channel component and a print head lifting component in sequence from top to bottom. The reel component is used to install the ribbon cassette and drive the ribbon to realize the reeling and unreeling action, and the ribbon drawn out of the ribbon cassette is located between the print head component and the print channel component; The print head component includes a print head support shaft, a print head bracket, a thermal print head, a return spring and a return paddle. The print head support shaft is rotatably installed through the main vertical plate. The print head bracket is installed at the front end of the main vertical plate, and the return spring and the return paddle are installed at the rear end of the main vertical plate. The print head bracket can rotate with the print head support shaft, and the thermal print head is fixed to the free rotating end of the print head bracket. The print head clamping component includes a clamping rotating shaft, a clamping handle, a clamping bracket and a retractable clamping end head, wherein the clamping rotating shaft is rotatably installed through the main vertical plate, the clamping handle and the clamping bracket are installed on the front end of the main vertical plate, and the retractable clamping end head is installed on the clamping bracket, and the clamping handle drives the clamping rotating shaft and the clamping bracket to rotate under the action of an external force, thereby driving the retractable clamping end head to rotate, and when the retractable clamping end head rotates downward, it abuts against the print head bracket of the print head component, prompting the print head bracket to rotate downward until the heating surface of the thermal print head presses the ribbon and the print medium, and when the retractable clamping end head rotates upward, it disengages from the print head bracket, and the print head bracket returns upward under the action of the return spring and the return paddle; The printing channel component is used to provide a channel for the printing medium and promote the transmission of the printing medium, and includes a channel support fixed at the lower part of the main vertical plate; The print head lifting component includes a camshaft and a cam arranged thereon, a power gear arranged at the end of the camshaft, and a push rod assembly arranged opposite to the cam, the camshaft is installed at the bottom of the front and rear side walls of the channel support through a shaft sleeve, the push rod assembly is vertically limited to the inner side of the side wall of the channel support and can slide up and down, the lower end of the push rod assembly contacts the cam surface of the cam, and the upper end of the push rod assembly contacts the bottom of the print head support. When the cam rotates driven by the power gear, it can drive the push rod assembly to slide upward, and then lift the print head support within the telescopic range of the retractable clamping end, so as to separate the ribbon from the printing medium. At this time, the printing medium continues to be conveyed and the ribbon stops being conveyed, thereby achieving the purpose of saving ribbon.

2. The thermal transfer printer according to claim 1, characterized in that: The retractable clamping end head includes a hemispherical end, a clamping spring, an adjusting knob and a center shaft. The lower end of the center shaft is fixedly connected to the upper end of the hemispherical end. The upper end of the center shaft extends into the lower center step hole of the clamping bracket, and the upper end of the center shaft is provided with an expansion portion to prevent the center shaft from escaping from the center step hole. The inner upper part of the adjusting knob is provided with an internal thread for connecting with the lower external thread of the clamping bracket. The inner lower part of the adjusting knob is provided with a countersunk hole for the upper end of the clamping spring to abut. The lower end of the clamping spring is connected to the upper end surface of the hemispherical end. The hemispherical end can elastically expand and contract under the action of the clamping spring, and the adjusting knob can adjust the tightness of the compression spring.

3. The thermal transfer printer according to claim 2, characterized in that: The print head lifting component includes two cams and two corresponding push rod assemblies, the two push rod assemblies are respectively vertically limited to the inner sides of the front and rear side walls of the channel support, and the bottom ends of the push rod assemblies are provided with rolling bearings that contact the cam surfaces.

4. The thermal transfer printer according to claim 1, characterized in that: The printing channel component also includes a feed rubber roller assembly, a print rubber roller assembly and a discharge rubber roller assembly installed on the upper part of the channel support, and two floating rubber roller assemblies and a sliding assembly installed on the main vertical plate; The feed rubber roller assembly, the print rubber roller assembly and the discharge rubber roller assembly all include rubber roller shafts arranged parallel to each other and mutually meshing gears fixed to the ends of the rubber roller shafts, for realizing synchronous transmission of the print medium; The floating rubber roller assembly comprises a support shaft, a floating plate, a long shaft and a floating torsion spring, wherein the support shaft is fixed to the main vertical plate, the floating plate is rotatably mounted on the support shaft, the long shaft is mounted on the floating end of the floating plate, the floating torsion spring is sleeved on the support shaft, one end of the floating torsion spring is fixed to the support shaft, and the other end contacts the floating plate and pushes the floating plate downward; the two floating rubber roller assemblies are symmetrically arranged above the feeding rubber roller assembly and the discharging rubber roller assembly respectively; The sliding assembly includes a sliding plate, a slide plate support shaft and a rack. At least two inclined grooves are provided on the upper end surface of the sliding plate. Both of the two floating plates are provided with floating shafts extending into the inclined grooves. At least two long holes are also provided in the middle of the sliding plate. The slide plate support shaft is arranged in the long holes. The other end of the sliding support shaft is fixed to the main vertical plate. One end of the rack is fixedly connected to the sliding plate, and the other end is provided with teeth. When the teeth move horizontally under the action of external force, the sliding plate is driven to move horizontally along the long holes. Then, the two floating plates are lifted or lowered under the action of the inclined grooves. When lifted, the printing medium is installed, and when lowered, the printing medium is pressed.

5. The thermal transfer printer according to claim 4, characterized in that: The printing channel component further includes a center clamping assembly, which includes a threaded shaft and guide shafts located on both sides thereof, and two clamping plates vertically connected to the threaded shaft and the guide shaft; The threaded shaft adopts a bidirectional threaded shaft, and its two ends are rotatably mounted on the front and rear side walls of the channel support, and the end extending out of the channel support is provided with a threaded shaft knob; The guide shaft comprises a first guide shaft and a second guide shaft, which are rotatably mounted on the front and rear side walls of the channel support, and the ends extending out of the channel support are respectively provided with a first knob and a second knob; The clamping plate is provided with through holes corresponding to the threaded shaft, the first guide shaft and the second guide shaft respectively, and the through holes corresponding to the threaded shaft are provided with threaded sleeves engaged with the threads of the threaded shaft. The threaded sleeves on the two clamping plates correspond to the bidirectional threads of the threaded shaft respectively, and at least two clamping columns are provided on the upper parts of the two clamping plates. By rotating the threaded shaft knob, the threaded shaft is driven to rotate, and the two clamping plates are moved toward or away from each other under the action of the bidirectional threads, thereby adjusting the distance between the clamping columns on the two clamping plates according to the width of the printing medium.

6. The thermal transfer printer according to claim 5, characterized in that: The center clamping assembly also includes a middle partition located between the two clamping plates, one end of the middle partition can be rotatably arranged on the first guide shaft, and the middle of the middle partition is respectively provided with an avoidance groove for the threaded shaft and the second guide shaft to pass through, the bottom of the other end of the middle partition is connected to a pull ring, the upper end of the pull ring is fixed to the side wall of the channel support, the bottom of the middle partition is provided with a horizontal flange, the upper part of the middle partition is provided with a dividing column, and a rotating protrusion is fixed to the middle part of the second guide shaft, and the free end of the rotating protrusion abuts against the horizontal flange. By rotating the second knob, the second guide shaft is driven to rotate, and the rotating protrusion presses down the horizontal flange, thereby driving the middle partition to rotate downward, so that the middle partition does not affect the installation and transmission of the printing medium between the two clamping plates. At this time, the printer is single-channel printing; After the second knob is rotated in the reverse direction, the rotating protrusion does not apply pressure to the horizontal flange, the middle partition rotates upward under the action of the pull ring, and the partition columns are flush with the clamping columns on both sides to form double channels. At this time, the printer is dual-channel printing.

7. The thermal transfer printer according to claim 5, characterized in that: A sliding gear is provided at the end of the first guide shaft away from the first knob, and the sliding gear is meshed with the teeth of the rack. Therefore, rotating the first knob can drive the rack to move horizontally.

8. The thermal transfer printer according to claim 4, characterized in that: The printing channel component also includes a driving assembly arranged at the rear end of the main vertical plate, and the driving assembly includes a mounting plate and a main motor and an auxiliary motor arranged on the mounting plate, the output shafts of the main motor and the auxiliary motor both pass through the mounting plate, and the mounting plate is also provided with a first reduction gear and a second reduction gear respectively meshing with the output gears at the ends of the output shafts of the main motor and the auxiliary motor, the first reduction gear also meshes with the gear in the printing rubber roller assembly to realize the transmission of the printing medium, and the second reduction gear also meshes with the power gear in the print head lifting component to realize the ribbon saving function.

9. The thermal transfer printer according to claim 1, characterized in that: The reel assembly includes a reel assembly, a reel assembly and a reel drive assembly. The reel assembly includes a reel metal shaft, a reel gear, a first damping spring and a first sleeve. The reel metal shaft is rotatably mounted on the main vertical plate. The reel gear is mounted on the rear end of the main vertical plate. The first damping spring and the first sleeve are mounted on the front end of the main vertical plate. The first sleeve can rotate around the reel metal shaft under the action of the first damping spring. The unwinding shaft assembly comprises an unwinding metal shaft, a second damping spring and a second shaft sleeve, one end of the unwinding metal shaft is fixed to the main vertical plate, and the other end is installed with the second damping spring and the second shaft sleeve, and the second shaft sleeve can rotate around the unwinding metal shaft under the action of the second damping spring; The winding drive assembly includes a winding drive motor and a winding reduction gear. The output gear of the winding drive motor is meshed with the winding reduction gear, and the winding reduction gear is meshed with the winding gear to realize the winding and unwinding action.

10. The thermal transfer printer according to any one of claims 1 to 9, characterized in that: The printer also includes a pre-delivery tube module installed on the frame, and the pre-delivery tube module includes a support frame and an active rubber roller shaft, a swing shaft, a photoelectric sensing shaft, a photoelectric plate and a power motor arranged thereon. The active rubber roller shaft is rotatably fixed on the support frame, one end of which is in contact with the swing shaft roller, and the other end is provided with a rubber roller gear, and the rubber roller gear is meshed with the output shaft of the power motor. The swing shaft is rotatably arranged on the support frame through a swing plate, and is pressed down on the active rubber roller shaft by a first torsion spring. One end of the photoelectric sensing shaft is rotatably mounted on the support frame, and the other end is provided with a rubber roller gear. The rubber roller gear is meshed with the output shaft of the power motor. The end is suspended by a sensing plate, the photoelectric plate is arranged on the supporting frame, and can form signal induction with the sensing plate of the photoelectric sensing shaft, the suspended end of the photoelectric sensing shaft is pressed down by the second torsion spring to below the upper end surface of the active rubber roller shaft, and the printing medium passes between the active rubber roller shaft and the swing shaft, passes under the suspended end of the photoelectric sensing shaft, and then enters the printing channel component upward, when the printing medium is consumed and tightened, the printing medium drives the suspended end of the photoelectric sensing shaft to gradually rise, and when the photoelectric plate senses the sensing plate, it triggers the power motor to start, thereby realizing the pre-delivery of the printing medium.

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