A thermal transfer printer

Abstract

The present invention relates to the field of thermal transfer printing technology, and in particular to a thermal transfer printer. The thermal transfer printer of the present invention comprises a frame, a printing component and a linear displacement mechanism, wherein the frame has a horizontal printing table, one side of the printing table is a tape inlet, and the other side is a tape outlet, the printing component is arranged above the printing table and close to it, the linear displacement mechanism is assembled in the frame and is transmission-connected with the printing component, and is used to drive the printing component to move linearly along the printing table between its two ends, so as to print the tape passing through the upper surface of the printing table. Advantages: reasonable structural design, easy operation and use, and effectively solves the problem of narrow printing width due to the fixed installation of the print head of the existing thermal transfer printer.

Description

Technical Field

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

[0002] The printing components in existing thermal transfer printers include a print head which is generally fixed on the printer, and the print head is usually arranged horizontally, that is, the print head is parallel to the width direction of the tape. Therefore, the width of the finished product printed by the thermal transfer printer corresponds to the width of the print head, that is, the printed product is limited by the width of the print head. It can be seen that the existing thermal transfer printers have the problem of narrow printing width and cannot meet the current demand for efficient printing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a thermal transfer printer, which effectively overcomes the defects of the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A thermal transfer printer comprises a frame, a printing assembly and a linear displacement mechanism, wherein the frame has a horizontal printing table, one side of the printing table is a tape inlet, and the other side is a tape outlet, the printing assembly is arranged above the printing table and close to the printing table, the linear displacement mechanism is assembled in the frame and is transmission-connected with the printing assembly, and is used to drive the printing assembly to move linearly along the printing table between its two ends, so as to print the tape passing through the upper surface of the printing table.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, it also includes a tape conveying mechanism, which is assembled in the frame and is used to convey the tape bidirectionally between the tape inlet and the tape outlet.

[0008] Furthermore, the tape conveying mechanism includes a bidirectional conveying roller group and a tape pressure roller group, the bidirectional conveying roller group includes a first driving device, a driving shaft and a conveying wheel, the driving shaft is horizontally mounted on the frame along the extending direction of the two ends of the printing table, and is rotatably arranged at a position corresponding to the tape outlet below the printing table, the first driving device is transmission-connected to one end of the driving shaft, and is used to drive the driving shaft to rotate around its axis, a plurality of coaxial conveying wheels are arranged on the driving shaft along its axial direction at intervals, notches corresponding to the conveying wheels are provided on the printing table, and the upper part of the conveying wheel protrudes upward from the corresponding notches, the tape pressure roller group includes a connecting rod 1, a second driving device, a rocker member and a pressure wheel, the connecting rod 1 is horizontally mounted on the frame along the extending direction of the two ends of the printing table, and is rotatably arranged at a position corresponding to the tape outlet above the printing table, and the connecting rod 1 is equipped with The cam, the second driving device is transmission connected with one end of the connecting rod one, and is used for driving the connecting rod one to swing around its center line, the rocking rod members are provided with a plurality of and are arranged one by one above the plurality of conveying wheels, the rocking rod members are respectively assembled on the frame through brackets rotatably connected thereto, one end of the rocking rod member extends to below the corresponding cam and contacts with the cam, and the other end of the rocking rod member is rotatably mounted with the pressure wheel, and a rebound component is also connected between the bracket and the rocking rod member, and the second driving device is used for driving the connecting rod one to drive the cam to rotate, so that the protrusion of the cam periodically slides over the other end of the rocking rod member, and when the protrusion of the cam slides along the surface of the rocking rod member, one end of the rocking rod member moves downward, and the other end drives the pressure wheel to move upward away from the conveying wheel, and when the protrusion of the cam slides over the rocking rod member, the rebound component drives one end of the rocking rod member to move upward and return to its position, and the other end drives the pressure wheel to move downward and close to the conveying wheel.

[0009] Furthermore, the linear displacement mechanism includes a roller screw transmission pair and a guide rail, the lead screw of the roller screw transmission pair is horizontally and rotatably arranged between the two ends of the frame, and is located above the tape inlet and the tape outlet, the guide rail is horizontally arranged between the two ends of the frame, and is located on one side of the lead screw, the printing assembly is fixedly connected to the nut seat of the roller screw transmission pair, and is slidably connected to the guide rail, and the driving mechanism of the roller screw transmission pair can drive the lead screw to rotate, thereby driving the nut seat and the printing assembly to move along the guide rail between the two ends of the printing table.

[0010] Furthermore, the above-mentioned printing component includes a shell, a ribbon box assembly, a print head and a print head lifting drive assembly. The lower end and one side of the above-mentioned shell are open, and one side of the opening faces the above-mentioned tape inlet. The above-mentioned ribbon box assembly includes two ribbon boxes that are arranged in parallel and at intervals at both ends of the inner side of the above-mentioned shell. The lower parts of the two ribbon boxes close to the open side of the shell are connected as a whole through a connecting piece. The two ribbon boxes are respectively equipped with ribbon rolls extending horizontally along both sides of the two, and one of the ribbon rolls is wound with a ribbon. The lower parts of the two ribbon boxes close to each other are provided with a strip opening for the ribbon to pass through, and the ribbon is pulled by one of the above-mentioned ribbon rolls. The ribbon reel is wound around another ribbon roll, and a ribbon receiving assembly and a ribbon unwinding assembly corresponding to the ribbon rolls of the two ribbon boxes are arranged on the inner wall on the other side of the shell. The ribbon receiving assembly and the ribbon unwinding assembly extend into the corresponding ribbon boxes respectively and are connected to the corresponding ribbon rolls in a transmission manner, thereby driving the two ribbon rolls to rotate to receive / release the ribbon. The print head spans above the ribbon segment between the two strip openings. The print head lifting drive assembly is installed in the shell and is connected to the print head in a transmission manner, for driving the print head to move up and down to press down the ribbon segment or separate from each other.

[0011] Furthermore, the print head lifting drive assembly includes a fixed plate, a mounting plate, a rotation drive device and a swing link assembly. The fixed plate is vertically fixed on the internal top wall of the shell and is located between the two ribbon boxes and spans above the ribbon segment. The mounting plate is arranged in parallel at one end of the fixed plate. The print head is installed at the lower end of the mounting plate. Guide structures are respectively provided on both sides of one end of the fixed plate close to the mounting plate. Both sides of the mounting plate are vertically slidably matched with the guide structures on both sides of one end of the fixed plate. The rotation drive device is assembled on the fixed plate. One end of the swing link assembly is transmission-connected with the rotation drive device, and the other end is movably connected with the mounting plate. The rotation drive device is used to drive the swing link assembly to swing up and down, thereby driving the mounting plate and the print head to move up and down relative to the guide structure.

[0012] Furthermore, the above-mentioned swing link second assembly includes a U-shaped shift fork, a swing rod and a second link respectively arranged in a vertical plane, the above-mentioned swing rod is a U-shaped member with an opening facing upwards, one end of which is rotatably connected to the upper part of one end of the above-mentioned fixed plate close to the mounting plate, and the other end of which is movably connected to the above-mentioned shift fork through a pin shaft limited inside the above-mentioned shift fork, the closed end of the above-mentioned swing rod is slidably connected and cooperated with an arc-shaped slide groove arranged on the above-mentioned fixed plate, the upper end of the above-mentioned second link is rotatably connected to the closed end of the above-mentioned swing rod, and the lower end of the above-mentioned second link is movably connected to the above-mentioned mounting plate, the above-mentioned rotation driving device is transmission connected to the above-mentioned shift fork, and the above-mentioned rotation driving device is used to drive the above-mentioned shift fork to drive the above-mentioned swing rod to swing around the rotation connection point between the above-mentioned fork and the fixed plate, thereby driving the lower end of the above-mentioned swing rod to slide along the corresponding above-mentioned slide groove, and then driving the above-mentioned second link and the above-mentioned mounting plate to move up and down along the above-mentioned guide structure.

[0013] Furthermore, an assembly hole is provided at the lower end of the above-mentioned connecting rod 2, and a positioning pin is provided on the above-mentioned mounting plate which is perpendicular to the connecting rod and passes through the above-mentioned assembly hole. The lower end of the above-mentioned connecting rod 2 is movably connected through the cooperation between the above-mentioned positioning pin and the assembly hole; a T-shaped member corresponding to the lower end of the above-mentioned connecting rod 2 is fixed at one end of the above-mentioned mounting plate close to the above-mentioned fixed plate, and the tip of the T-shaped member faces downward and is provided with the above-mentioned positioning pin, and a T-shaped connecting part is provided at the lower end of the above-mentioned connecting rod 2, and the above-mentioned assembly hole is provided on the T-shaped connecting part, and elastic parts are respectively connected between the two ends of the straight sections of the above-mentioned T-shaped member and the T-shaped connecting part.

[0014] The cam assembly is connected to the guide shaft by a toothed plate, and the toothed plate is connected to the guide shaft by a toothed plate, and the toothed plate is connected to the guide shaft by a toothed plate.

[0015] The beneficial effects of the present invention are: reasonable structural design, convenient operation and use, and effectively solving the problem of narrow printing width caused by fixed installation of the print head of the existing thermal transfer printer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the thermal transfer printer of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The structure of the thermal transfer printer of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 for Figure 2 A magnified view of the structure of part A;

[0019] Figure 4 The structure of the thermal transfer printer of the present invention is shown in FIG. Figure 3 ;

[0020] Figure 5 It is a structural schematic diagram of a swing rod member in a thermal transfer printer of the present invention;

[0021] Figure 6 It is a structural schematic diagram of a printing component in a thermal transfer printer of the present invention;

[0022] Figure 7 A distribution diagram of a ribbon cassette in a thermal transfer printer of the present invention;

[0023] Figure 8 A diagram showing the structural coordination between the lifting mechanism and the print head in the thermal transfer printer of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of the lifting mechanism in the thermal transfer printer of the present invention;

[0025] Fig.10 It is a structural schematic diagram of the lifting mechanism in the thermal transfer printer of the present invention without the fixing plate;

[0026] Fig.11 It is a schematic structural diagram of a ribbon releasing / receiving assembly in a thermal transfer printer of the present invention.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Shell, 2. Ribbon cassette, 3. Print head, 4. Print head lifting drive assembly, 5. Ribbon segment, 7. Frame, 8. Print assembly, 9. Linear displacement mechanism, 41. Fixed plate, 42. Mounting plate, 43. Rotary drive device, 44. Fork, 45. Swing rod, 46. Connecting rod 2, 47. Track, 48. Guide wheel, 49. Elastic member, 61. Guide shaft, 62. Motor, 63. Synchronous belt, 64. Secondary pulley, 65. Docking assembly, 66. Guide pin, 71, printing table, 97, roller screw transmission pair, 98, guide rail, 101, first driving device, 102, driving shaft, 103, conveying wheel, 111, connecting rod 1, 112, second driving device, 113, rocker member, 114, pressure wheel, 411, slide groove, 421, positioning pin, 422, T-shaped member, 461, T-shaped connecting part, 651, bayonet, 1111, cam, 1131, first connecting shaft, 1132, second connecting shaft. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] Example: Figures 1 to 5 As shown, the thermal transfer printer of this embodiment includes a frame 7, a printing component 8 and a linear displacement mechanism 9. The frame 7 has a horizontal printing table 71, one side of the printing table is a tape inlet, and the other side is a tape outlet. The printing component 8 is arranged above the printing table 71 and close to the printing table 71. The linear displacement mechanism 9 is assembled in the frame 7 and is transmission-connected with the printing component 8, and is used to drive the printing component 8 to move linearly along the printing table 71 between its two ends, so as to print the tape passing through the upper surface of the printing table 71.

[0031] In the entire embodiment, the printing component 8 can be adjusted to move horizontally to any position of the width of the tape below through the linear displacement mechanism 9, thereby enhancing the flexibility of printing and increasing the printing width, which completely improves the limitation problem of fixed printing width of traditional thermal transfer printers and greatly increases the width of sequential printing.

[0032] As a preferred embodiment, it further comprises a tape conveying mechanism, which is assembled in the frame 7 and is used for bidirectionally conveying the tape between the tape inlet and the tape outlet.

[0033] In this embodiment, the tape conveying mechanism can be used to convey the tape well and stably on the printing table 71 to complete the continuous printing operation.

[0034] As a preferred embodiment, Figure 3 , 4As shown in Figure 5, the tape conveying mechanism includes a bidirectional conveying roller group and a tape pressure roller group. The bidirectional conveying roller group includes a first driving device 101, a driving shaft 102 and a conveying wheel 103. The driving shaft 102 is horizontally mounted on the frame 7 along the extension direction of both ends of the printing table 71, and is rotatably arranged at a position corresponding to the tape outlet below the printing table 71. The first driving device 101 is drivingly connected to one end of the driving shaft 102 to drive the driving shaft 102 to rotate around its axis. A plurality of coaxial conveying wheels 103 are arranged on the driving shaft 102 along its axial direction. 03, the printing table 71 is provided with notches corresponding to the conveying wheels 103, the upper part of the conveying wheels 103 protrudes upward from the corresponding notches, the tape pressing roller assembly comprises a connecting rod 111, a second driving device 112, a rocker member 113 and a pressing wheel 114, the connecting rod 111 is horizontally mounted on the frame 7 along the extending direction of both ends of the printing table 71, and is rotatably arranged at a position above the printing table 71 corresponding to the tape outlet, the connecting rod 111 is equipped with cams 1111 corresponding to the conveying wheels 103 and the pressing wheel 114 respectively, the above The second driving device 112 is connected to one end of the connecting rod 111 for driving the connecting rod 111 to swing around its center line. The rocker members 113 are provided in plurality and are arranged one by one above the plurality of conveying wheels 103. The rocker members 113 are respectively mounted on the frame 7 through brackets rotatably connected thereto. One end of the rocker member 113 extends below the corresponding cam 1111 and contacts the cam 1111. The other end of the rocker member 113 is rotatably mounted with the pressing wheel 114. A rebound component is also connected between the bracket and the rocker member 113. The second driving device 112 It is used to drive the above-mentioned connecting rod 111 to drive the above-mentioned cam 1111 to rotate, so that the protrusion of the above-mentioned cam 1111 periodically slides over the other end of the above-mentioned rocker member 113, and when the protrusion of the above-mentioned cam 1111 slides along the surface of the above-mentioned rocker member 113, one end of the above-mentioned rocker member 113 moves downward, and the other end drives the above-mentioned pressure wheel 114 to move upward away from the above-mentioned conveying wheel 103; after the protrusion of the above-mentioned cam 1111 slides over the above-mentioned rocker member 113, the above-mentioned rebound component drives one end of the above-mentioned rocker member 113 to move upward and return to its original position, and the other end drives the above-mentioned pressure wheel 114 to move downward and close to the above-mentioned conveying wheel 103.

[0035] In this embodiment, during printing, the second driving device 112 drives the connecting rod 111 and the cam 1111 to rotate, so that the swinging member 113 swings periodically, and then the pressure wheel 114 and the conveying wheel 103 periodically approach and tighten the tape therebetween, so that the conveying wheel 103 periodically conveys the tape feed. The design of the entire device is relatively reasonable and easy to operate.

[0036] It should be noted that two sets of the above-mentioned bidirectional conveying roller sets can be provided, and they can be assembled with the frame 1 respectively.

[0037] It is necessary to add that: Figure 4 and 5 As shown, the rocker member 113 is rotatably connected to the bracket via a first connecting shaft 1131, and the bracket is also connected to a second connecting shaft 1132 parallel to the first connecting shaft 1131. The second connecting shaft 1132 is equipped with a torsion spring connected to the upper end of one end of the rocker member 113, and the torsion spring constitutes a rebound component.

[0038] The above-mentioned first driving device 101 and second driving device 112 both adopt a transmission assembly of a motor and a pulley. A main wheel is coaxially provided on the driving shaft of the motor. The main wheel and the secondary wheel are surrounded by the pulley together. The secondary wheels are respectively connected to the corresponding connecting rod 111 or the driving shaft 102.

[0039] As a preferred embodiment, the linear displacement mechanism 9 includes a roller screw transmission pair 97 and a guide rail 98. The lead screw of the roller screw transmission pair 97 is horizontally and rotatably arranged between the two ends of the frame 7 and is located above the tape inlet and the tape outlet. The guide rail 98 is horizontally arranged between the two ends of the frame 7 and is located on one side of the lead screw. The printing assembly 8 is fixedly connected to the nut seat of the roller screw transmission pair 97 and is slidably connected to the guide rail 98. The driving mechanism of the roller screw transmission pair 97 can drive the lead screw to rotate, thereby driving the nut seat and the printing assembly 8 to move along the guide rail 98 between the two ends of the printing table 71.

[0040] In this embodiment, the linear displacement mechanism 9 adopts a traditional screw transmission pair, which is stable and simple to operate, and can effectively drive the printing component 8 to move horizontally to adjust the printing width on its tape surface.

[0041] The driving mechanism of the roller screw transmission pair 97 adopts a transmission assembly of a motor and a pulley. One end of the screw is coaxially connected to the secondary wheel. A main wheel is coaxially provided on the driving shaft of the motor. The main wheel and the secondary wheel surround the pulley together.

[0042] Of course, the linear displacement mechanism 9 can also adopt other forms of linear displacement mechanisms 9, such as telescopic devices, cylinders, hydraulic cylinders, electric push rods, etc., as long as they can drive the printing component 8 to move and print smoothly and well.

[0043] As a preferred embodiment, Figure 6 and 7As shown, the printing assembly 8 includes a shell 1, a ribbon cartridge assembly, a print head 3 and a print head lifting drive assembly 4. The lower end and one side of the shell 1 are open, and one side of the opening faces the tape inlet. The ribbon cartridge assembly includes two ribbon cartridges 2 arranged in parallel and at intervals at both ends of the inner side of the shell 1. The two ribbon cartridges 2 are connected as a whole by a connecting piece at the lower part of one side close to the open side of the shell 1. The two ribbon cartridges 2 are respectively equipped with ribbon rolls extending horizontally along both sides of the two ribbon cartridges, and one of the ribbon rolls is wound with a ribbon. The lower part of the side of the two ribbon cartridges 2 close to each other is provided with a strip opening for the ribbon to pass through, and the ribbon is pulled by one of the ribbon rolls Out, and pass through the two above-mentioned strip-shaped openings in sequence, and be wound on the other above-mentioned ribbon roll. The inner wall on the other side of the above-mentioned shell 1 is provided with a ribbon collection assembly and a ribbon release assembly corresponding to the ribbon rolls of the two above-mentioned ribbon boxes 2 respectively. The above-mentioned ribbon collection assembly and ribbon release assembly extend into the corresponding above-mentioned ribbon boxes 2 respectively, and are transmission connected with the corresponding above-mentioned ribbon rolls, so as to drive the two above-mentioned ribbon rolls to rotate to collect / release the ribbon. The above-mentioned print head 3 spans above the ribbon segment 5 between the two above-mentioned strip openings. The above-mentioned print head lifting drive assembly 4 is installed in the above-mentioned shell 1, and is transmission connected with the above-mentioned print head 3, and is used for driving the above-mentioned print head 3 to move up and down to press down the above-mentioned ribbon segment 5 or separate from each other.

[0044] In this embodiment, the ribbon cassette 2 and the print head 3 are integrated into a housing 1, occupying a small space and with compact components. During actual use, the ribbon roll wound with the ribbon is connected to the square ribbon assembly, and the other ribbon roll (another ribbon to be wound) is connected to the ribbon collection assembly. During printing, the print head lifting drive assembly 4 drives the print head 3 to move downward to press the ribbon segment 5 between the two ribbon cassettes 4 onto the tape below, the ribbon unwinding assembly unwinds, and the ribbon collection assembly rewinds synchronously, and printing can be completed during the tape traction and conveying process.

[0045] Of course, the printing component 8 can also utilize the printing components of other thermal transfer printers in the prior art. The above embodiment is only one embodiment of the thermal transfer printer of the present invention, which should include but not be limited to the structural composition of the printing component 8.

[0046] As a preferred embodiment, Figure 8 and 9As shown, the print head lifting drive assembly 4 includes a fixed plate 41, a mounting plate 42, a rotation drive device 43 and a swing link assembly. The fixed plate 41 is vertically fixed on the inner top wall of the shell 1 and is located between the two ribbon boxes 2 and spans above the ribbon segment 5. The mounting plate 42 is arranged in parallel at one end of the fixed plate 41. The print head 3 is installed on the lower end of the mounting plate 42. Guide structures are respectively provided on both sides of one end of the fixed plate 41 close to the mounting plate 42. Both sides of the mounting plate 42 are vertically slidably matched with the guide structures on both sides of one end of the fixed plate 41. The rotation drive device 43 is assembled on the fixed plate 41. One end of the swing link assembly is transmission-connected with the rotation drive device 43, and the other end is movably connected with the mounting plate 42. The rotation drive device 43 is used to drive the swing link assembly to swing up and down, thereby driving the mounting plate 42 and the print head 3 to move up and down relative to the guide structure.

[0047] In this embodiment, the operation process of the print head lifting drive assembly 4 is specifically as follows: the rotary drive device 43 drives the swing link assembly to swing up and down around the connection point between the two. During the swinging process, the lower end of the swing link assembly can drive the mounting plate 42 to drive the print head 3 to move up and down along the guide structure, thereby pressing down the ribbon segment 5 (printing) or moving upward to separate (stop printing). The overall structure is simple and easy to operate.

[0048] Of course, the print head lifting drive assembly 4 can be a component that directly drives the print head to lift up and down, such as a cylinder, an electric push rod, etc.

[0049] More specifically, Figure 8 , 9 As shown in Figures 10 and 11, the swing link assembly includes a U-shaped fork 44, a swing rod 45 and a connecting rod 46 respectively arranged in a vertical plane. The swing rod 45 is a U-shaped member with an opening facing upward, one end of which is rotatably connected to the upper part of one end of the fixing plate 41 close to the mounting plate 42, and the other end of which is movably connected to the fork 44 through a pin limited inside the fork 44. The closed end of the swing rod 45 is slidably connected and matched with an arc-shaped slide groove 411 arranged on the fixing plate 41. The connecting rod 46 is a U-shaped member with an opening facing upward, and one end of the swing rod 45 is rotatably connected to the upper part of the fixing plate 41 close to the mounting plate 42. The upper end of the second rod 46 is rotationally connected to the closed end of the above-mentioned swing rod 45, and the lower end thereof is movably connected to the above-mentioned mounting plate 42. The above-mentioned rotation driving device 43 is transmission-connected to the above-mentioned fork 44. The above-mentioned rotation driving device 43 is used to drive the above-mentioned fork 44 to drive the above-mentioned swing rod 45 to swing around the rotation connection point between it and the fixed plate 41, thereby driving the lower end of the above-mentioned swing rod 45 to slide along the corresponding above-mentioned slide groove 411, and then driving the above-mentioned connecting rod 2 46 and the above-mentioned mounting plate 42 to move up and down along the above-mentioned guide structure.

[0050] In this embodiment, the operation process is specifically as follows: the rotating drive device 43 drives the fork 44 to swing, and the fork 44 drives the swing rod 45 to swing up and down around the connection point between it and the fixed plate 41. During the swinging process of the swing rod 45, the connecting rod 2 46 is driven to move up and down, thereby driving the mounting plate 42 and the print head 3 that slide with the guide structure to move up and down. The entire component composition utilizes the principle of multiple connecting rod driving, and the design is relatively ingenious.

[0051] As a preferred embodiment, Fig.10 As shown, an assembly hole is opened at the lower end of the above-mentioned connecting rod 46, and a positioning pin 421 is provided on the above-mentioned mounting plate 42 which is perpendicular to the above-mentioned connecting rod 46 and passes through the above-mentioned assembly hole. The lower end of the above-mentioned connecting rod 46 is movably connected through the cooperation of the above-mentioned positioning pin 421 and the assembly hole; a T-shaped member 422 corresponding to the lower end of the above-mentioned connecting rod 46 is fixed at one end of the above-mentioned mounting plate 42 close to the above-mentioned fixing plate 41, and the tip of the T-shaped member 23 faces downward and is provided with the above-mentioned positioning pin 421, and the lower end of the above-mentioned connecting rod 46 is provided with a T-shaped connecting portion 461, and the above-mentioned assembly hole is provided on the T-shaped connecting portion 461, and elastic parts are respectively connected between the two ends of the straight sections of the above-mentioned T-shaped member 422 and the T-shaped connecting portion 461.

[0052] In this embodiment, the lower end of the connecting rod 46 and the mounting plate 42 adopt the cooperation of the pin and the hole, the structures are compactly matched, and the design of the T-shaped member 422 and the T-shaped connecting part 461 is conducive to the good assembly of the elastic part 49. The design of the elastic part 49 can play a certain buffering role, which can effectively prevent the machine from getting stuck and ensure the good operation of the swing connecting rod assembly.

[0053] The elastic member 49 is a conventional spring, which is easy to assemble and easy to use.

[0054] As a preferred embodiment, the above-mentioned rotation drive device 43 is a motor, which is installed on the upper part of one end of the above-mentioned fixed plate 41 away from the above-mentioned mounting plate 42. Its drive shaft passes through the above-mentioned fixed plate 41 and is connected and fixed to the closed end of the above-mentioned fork. The rotation drive device 43 is reasonably installed and is stable and convenient to use.

[0055] As a preferred embodiment, the guide structure is two vertically arranged rails 47, and a plurality of guide wheels 48 spaced apart vertically are rotatably provided on both sides of one end of the mounting plate 42 close to the fixed plate 41, and the guide wheels 48 are all located on the side where the two rails 47 are close to each other, and respectively roll with the rails 47 on the corresponding side.

[0056] In this embodiment, by designing the guide wheels 48 on both sides of the mounting plate 42 and utilizing the rolling cooperation between the guide wheels 48 and the track 47, it can be ensured that the mounting plate 42 moves up and down in the correct direction without shaking. At the same time, the rolling cooperation can reduce the friction between the two contacts, thereby reducing the energy consumption during the relative movement time.

[0057] Preferably, the print head 3 is a strip-shaped component spanning across the ribbon segment 5 , has a moderate printing amplitude, and effectively cooperates with the ribbon segment 5 .

[0058] As a preferred embodiment, Fig.11 As shown, the above-mentioned ribbon unwinding assembly and the ribbon receiving assembly have the same specifications and both include a guide shaft 61, a motor 62, a synchronous belt 63, a primary pulley and a secondary pulley 64. Ribbon reel mounting openings are respectively provided on the side walls on both sides of the above-mentioned ribbon cassette 2. The two ends of the above-mentioned ribbon reel extend into the above-mentioned ribbon reel mounting openings on both sides of the above-mentioned ribbon cassette 2 respectively. The above-mentioned guide shaft 61 passes through the corresponding above-mentioned ribbon reel. One end of the above-mentioned guide shaft 61 is rotatably connected to the inner wall of the above-mentioned housing 1 away from the open side, and the above-mentioned secondary pulley 64 is coaxially mounted on the end. A recessed area is provided on one side of the wheel 64 close to the above-mentioned ribbon roll, and a docking assembly 65 which can move along its axial direction is provided on the inner wall of the above-mentioned recessed area. The above-mentioned docking assembly 65 is transmission-connected with one end of the corresponding above-mentioned ribbon roll close to it. The above-mentioned motor 62 is installed on the inner wall of the side of the above-mentioned ribbon box 2 away from the ribbon roll assembly port and is located below the above-mentioned secondary pulley 64. The above-mentioned main pulley is coaxially installed on the driving shaft of the above-mentioned motor 62. The above-mentioned synchronous belt 63 surrounds the above-mentioned main pulley and the secondary pulley 64, and the ribbon roll is mounted on the above-mentioned guide shaft 61.

[0059] In this embodiment, during the installation process, the ribbon roll is inserted into the corresponding guide shaft 61 through the ribbon roll assembly port, and is detachably connected to the corresponding secondary pulley 64 through a docking assembly to realize the rotational reeling / unreeling of the ribbon roll, so that the ribbon roll in the ribbon box 2 can complete the reeling / unreeling operation of the two ribbon rolls under the drive of the docking assembly 65 and the corresponding secondary pulley 64. Specifically, the motor 62 drives the main pulley to operate, which can drive the secondary pulley 64 and the guide shaft 61 to rotate through the synchronous belt 63, thereby driving the docking assembly 65 and the corresponding ribbon roll to rotate through the secondary pulley 64 to realize the reeling or unreeling operation, and the operation of the entire assembly is relatively stable.

[0060] More specifically, the above-mentioned recessed area is a circular groove-shaped structure, the above-mentioned docking component 65 is a circular sheet-like component, the bottom wall of the above-mentioned recessed area is provided with a plurality of guide pins 66 extending along the axial direction of the above-mentioned guide shaft 61, the above-mentioned docking component 65 is provided with holes corresponding to the above-mentioned guide pins 66 one by one, the above-mentioned guide pins 66 pass through the corresponding holes, an elastic member is connected between the bottom wall of the above-mentioned recessed area and the above-mentioned docking component 65, the inner ring of the above-mentioned docking component 65 is provided with a plurality of bayonet holes 651 spaced apart along its circumference, and the outer periphery of one end of the above-mentioned ribbon roll close to the above-mentioned docking component 65 is provided with a card block that engages with the plurality of the above-mentioned bayonet holes 651.

[0061] The design of the docking assembly 65 is relatively reasonable, and can achieve a tight transmission connection between the ribbon roll and the secondary pulley 64, so that when the secondary pulley 64 rotates, the ribbon roll is driven to rotate to perform the winding / unwinding operation.

[0062] It should be noted that a limiting member detachably connected to the end of the guide shaft 61 should also be provided at the ribbon roll assembly port, and the limiting member can prevent the ribbon roll from escaping from the end of the guide shaft 61.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal transfer printer, characterized in that: The invention comprises a frame (7), a printing assembly (8) and a linear displacement mechanism (9), wherein the frame (7) has a horizontal printing table (71), one side of the printing table is a tape inlet, and the other side is a tape outlet, the printing assembly (8) is arranged above the printing table (71) and close to the printing table (71), the linear displacement mechanism (9) is assembled in the frame (7) and is transmission-connected with the printing assembly (8) to drive the printing assembly (8) to move linearly along the printing table (71) between its two ends, so as to print on the tape passing through the upper surface of the printing table (71); and further comprises a tape conveying mechanism, which is assembled in the frame (7) and is used to convey the tape bidirectionally between the tape inlet and the tape outlet;The tape conveying mechanism comprises a bidirectional conveying roller group and a tape pressure roller group, the bidirectional conveying roller group comprises a first driving device (101), a driving shaft (102) and a conveying wheel (103), the driving shaft (102) is horizontally mounted on the frame (7) along the extension direction of both ends of the printing table (71), and is rotatably arranged at a position corresponding to the tape outlet below the printing table (71), the first driving device (101) is drivingly connected to one end of the driving shaft (102) for driving the driving shaft (102) to rotate around its axis, a plurality of coaxial conveying wheels (103) are arranged on the driving shaft (102) along its axial direction, the printing The table (71) is provided with notches corresponding to the conveying wheels (103) one by one, and the upper part of the conveying wheels (103) protrudes upward from the corresponding notches. The tape pressure roller group comprises a connecting rod (111), a second driving device (112), a rocker member (113) and a pressure wheel (114). The connecting rod (111) is horizontally mounted on the frame (7) along the extension direction of both ends of the printing table (71), and is rotatably arranged at a position above the printing table (71) corresponding to the tape outlet. The connecting rod (111) is equipped with cams (1111) corresponding to the conveying wheels (103) and the pressure wheel (114) one by one. The second driving device (112) is a swing rod member (113) and a pressure wheel (114). The driving device (112) is transmission-connected with one end of the connecting rod (111) and is used to drive the connecting rod (111) to swing around its center line. A plurality of the swing rods (113) are provided and are arranged one by one above the plurality of the conveying wheels (103). The swing rods (113) are respectively mounted on the frame (7) through brackets rotatably connected thereto. One end of the swing rod (113) extends below the corresponding cam (1111) and contacts the cam (1111). The other end of the swing rod (113) is rotatably mounted with the pressing wheel (114). A rebound component is also connected between the bracket and the swing rod (113). The second driving device (112) is used to drive The connecting rod 1 (111) drives the cam (1111) to rotate, so that the protrusion of the cam (1111) periodically slides over the other end of the rocker member (113); when the protrusion of the cam (1111) slides along the surface of the rocker member (113), one end of the rocker member (113) moves downward, and the other end drives the pressure wheel (114) to move upward away from the conveying wheel (103); after the protrusion of the cam (1111) slides over the rocker member (113), the rebound component drives one end of the rocker member (113) to move upward back to its original position, and the other end drives the pressure wheel (114) to move downward close to the conveying wheel (103);The linear displacement mechanism (9) comprises a roller screw transmission pair (97) and a guide rail (98). The lead screw of the roller screw transmission pair (97) is horizontally and rotatably arranged between the two ends of the frame (7) and is located above the tape inlet and the tape outlet. The guide rail (98) is horizontally arranged between the two ends of the frame (7) and is located on one side of the lead screw. The printing component (8) is fixedly connected to the nut seat of the roller screw transmission pair (97) and is slidably connected to the guide rail (98). The driving mechanism of the pair (97) can drive the lead screw to rotate, thereby driving the nut seat and the printing assembly (8) to move along the guide rail (98) between the two ends of the printing table (71); the printing assembly (8) includes a shell (1), a ribbon box assembly, a print head (3) and a print head lifting drive assembly (4), the lower end and one side of the shell (1) are open, and one side of the opening faces the tape inlet, the ribbon box assembly includes two ribbon boxes (2) arranged in parallel and spaced relation at the two ends of the inner side of the shell (1), the two The lower part of one side of the ribbon box (2) close to the open side of the shell (1) is connected as a whole by a connecting piece. The two ribbon boxes (2) are respectively equipped with a ribbon roll extending horizontally along both sides of the two ribbon boxes, and one of the ribbon rolls is wound with a ribbon. The lower part of the side close to each other of the two ribbon boxes (2) is provided with a strip opening for the ribbon to pass through. The ribbon is pulled out from one of the ribbon rolls and passes through the two strip openings in sequence and is wound on the other ribbon roll. The inner wall of the other side of the shell (1) is provided with a ribbon roll separation plate for the two ribbon boxes (2). The printing head (3) is provided with a corresponding ribbon collecting assembly and a corresponding ribbon releasing assembly, the ribbon collecting assembly and the ribbon releasing assembly are respectively extended into the corresponding ribbon box (2) and are drivingly connected to the corresponding ribbon roll, thereby driving the two ribbon rolls to rotate to collect / release the ribbon, the printing head (3) spans above the ribbon segment (5) between the two strip-shaped openings, and the printing head lifting drive assembly (4) is installed in the housing (1) and is drivingly connected to the printing head (3) for driving the printing head (3) to move up and down to press down the ribbon segment (5) or to separate from each other;The print head lifting drive assembly (4) comprises a fixed plate (41), a mounting plate (42), a rotation drive device (43) and a swing link assembly. The fixed plate (41) is vertically fixed to the top wall inside the housing (1) and is located between the two ribbon boxes (2) and straddles the top of the ribbon segment (5). The mounting plate (42) is arranged parallel to one end of the fixed plate (41). The print head (3) is mounted on the lower end of the mounting plate (42). The fixed plate (41) has two sides on one end close to the mounting plate (42) respectively. A guide structure is provided, and the two sides of the mounting plate (42) are respectively vertically slidably matched with the guide structures on the two sides of one end of the fixed plate (41), and the rotation drive device (43) is assembled on the fixed plate (41). One end of the swing link assembly is transmission-connected with the rotation drive device (43), and the other end is movably connected with the mounting plate (42). The rotation drive device (43) is used to drive the swing link assembly to swing up and down, thereby driving the mounting plate (42) and the print head (3) to move up and down relative to the guide structure; the swing The movable connecting rod assembly comprises a U-shaped shift fork (44), a swing rod (45) and a second connecting rod (46) respectively arranged in a vertical plane. The swing rod (45) is a U-shaped member with an opening facing upwards, one end of which is rotatably connected to the upper part of one end of the fixed plate (41) close to the mounting plate (42), and the other end of which is movably connected to the shift fork (44) through a pin shaft limited inside the shift fork (44). The closed end of the swing rod (45) is slidably connected to an arc-shaped sliding groove (411) arranged on the fixed plate (41). The second connecting rod (46) The upper end is rotatably connected to the closed end of the swing rod (45), and the lower end is movably connected to the mounting plate (42). The rotation drive device (43) is transmission-connected to the shift fork (44). The rotation drive device (43) is used to drive the shift fork (44) to drive the swing rod (45) to swing around the rotation connection point between the swing rod (45) and the fixed plate (41), thereby driving the lower end of the swing rod (45) to slide along the corresponding slide groove (411), thereby driving the second connecting rod (46) and the mounting plate (42) to move up and down along the guide structure.

2. A thermal transfer printer according to claim 1, characterized in that: The lower end of the second connecting rod (46) is provided with an assembly hole, and the mounting plate (42) is provided with a positioning pin (421) which is perpendicular to the connecting rod and passes through the assembly hole. The lower end of the second connecting rod (46) is movably connected through the cooperation between the positioning pin (421) and the assembly hole; a T-shaped member (422) corresponding to the lower end of the second connecting rod (46) is fixed at one end of the mounting plate (42) close to the fixing plate (41), and the tip of the T-shaped member (422) is downward and provided with the positioning pin (421); the lower end of the second connecting rod (46) is provided with a T-shaped connecting portion (461), and the T-shaped connecting portion (461) is provided with the assembly hole; elastic members (49) are respectively connected between the two ends of the straight sections of the T-shaped member (422) and the T-shaped connecting portion (461).

3. A thermal transfer printer according to claim 1, characterized in that: The specifications of the ribbon unwinding assembly and the ribbon receiving assembly are consistent, and both include a guide shaft (61), a motor (62), a synchronous belt (63), a main pulley and a secondary pulley (64). Ribbon roll assembly openings are respectively provided on the side walls of the ribbon box (2). The two ends of the ribbon roll respectively extend into the ribbon roll assembly openings on the two sides of the ribbon box (2). The guide shaft (61) passes through the corresponding ribbon roll. One end of the guide shaft (61) is rotatably connected to the inner wall of the shell (1) away from the open side, and the secondary pulley (64) is coaxially mounted on the end. The secondary pulley (64) ) is provided with a recessed area on one side close to the ribbon roll, and a docking assembly (65) movable along its axial direction is provided on the inner wall of the recessed area, and the docking assembly (65) is detachably connected to the corresponding end of the ribbon roll close to it, the motor (62) is installed on the inner wall of the ribbon box (2) on the side away from the ribbon roll assembly port and is located below the secondary pulley (64), the main pulley is coaxially mounted on the driving shaft of the motor (62), the synchronous belt (63) surrounds the main pulley and the secondary pulley (64), and the ribbon roll is mounted on the guide shaft (61).

4. A thermal transfer printer according to claim 3, characterized in that: The recessed area is a circular groove-shaped structure, and the docking component (65) is a circular sheet-like component. A plurality of guide pins (66) extending axially along the guide shaft (61) are provided on the bottom wall of the recessed area, and the docking component (65) is provided with holes corresponding to the guide pins (66) one by one, and the guide pins (66) pass through the corresponding holes. An elastic member is connected between the bottom wall of the recessed area and the docking component (65), and a plurality of bayonet holes (651) are provided on the inner ring of the docking component (65) at intervals along its circumference, and a card block that engages with the plurality of bayonet holes (651) is provided on the outer periphery of one end of the ribbon roll close to the docking component (65).

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