Thermal printer

Abstract

A thermal printer is characterized in that the thermal printer comprises a machine base, a transmission gear set, a motor, a cover plate, a rubber roller assembly and a printing head assembly, the machine base is provided with a partition plate and a connecting shaft pin, and a guide-in groove is formed in the partition plate; the cover plate can be movably arranged on the machine base, the cover plate is provided with a guide hole for the connecting shaft pin to stretch in, and the guide hole comprises a horizontal part and a vertical part which is located at the rear end of the horizontal part and extends downwards. The printing head assembly is arranged on the machine base, and the two ends of the printing head assembly are provided with shaft grooves allowing the middle shaft to be rotationally arranged. A complex disengaging operation mechanism is not needed, the overall structure is more compact, thinning or design is facilitated, and the manufacturing cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a printing device, in particular to a thermal printing device. Background Art

[0002] Existing thermal printers generally include a frame, a motor, a transmission gear assembly, a print head assembly and a rubber roller rotatably arranged on the frame. The power input end of the transmission gear assembly is meshed with the active output gear of the motor, and the power output end is meshed with the rubber roller gear arranged at the end of the rubber roller. The rubber roller is used to drive the printing paper to move. There is a paper feed channel between the rubber roller and the print head assembly. The print head assembly generally includes a print head (abbreviated as TPH, Thermal Print Head), a print head bracket, a compression spring and a compression spring support frame. The print head is arranged on the print head bracket, and the two ends of the compression spring support frame are arranged at the two ends of the frame. The two ends of the compression spring are respectively against the print head bracket and the compression spring support frame, so that the print head can press the printing paper against the surface of the rubber roller.

[0003] The following key coordinations must be controlled during design: 1. The distance between the rubber roller gear and the transmission gear assembly; 2. The tangent position between the rubber roller and TPH must be pressed on the heating line of TPH; 3. After the rubber roller and TPH assembly are coordinated, whether the box cover is in place. The above three sets of coordination key points are generally achieved by different parts coordination, and the structure is relatively complex.

[0004] Referring to the Chinese invention patent application disclosed with application number 202011427406.X "Thermal Printer Movement" (application publication number CN112549787A), the rubber roller assembly in the application is arranged on the frame through a detachable mechanism. Specifically, the detachable mechanism includes a rotating shaft, a swing plate, a transmission plate and a wrench. When the whole machine is assembled for use, an outer shell and a button for operating the wrench are also required. This application uses a detachable mechanism to ensure the distance between the rubber roller gear and the transmission gear assembly, and also ensures that the TPH will be installed in place. The overall structure is relatively complex, which also makes the overall movement relatively large and not streamlined enough. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a thermal printer with a compact structure in view of the above technical status. The preset position of the rubber roller gear and the transmission gear assembly behind the thermal printer box cover, the tangent position of the rubber roller and the thermal print head, and the cover plate and the base box cover can be completed at one time.

[0006] The utility model solves the above technical problems by adopting the following technical solution: a thermal printer, characterized in that it includes

[0007] The machine base is provided with a partition plate and a connecting shaft pin, and the aforementioned partition plate is formed with a guide groove;

[0008] A transmission gear set is rotatably disposed on the aforementioned base and close to the aforementioned partition;

[0009] A motor, which is arranged on the aforementioned machine base and has an output gear at its power output end that meshes with the power input end of the aforementioned transmission gear set;

[0010] A cover plate is movably arranged on the aforementioned machine base, and the cover plate has a guide hole for the aforementioned connecting shaft pin to extend into, and the guide hole includes a horizontal portion and a vertical portion located at the rear end of the horizontal portion and extending downward;

[0011] A rubber roller assembly is rotatably disposed inside the aforementioned cover plate and comprises a rubber roller, a central shaft and an input gear disposed at the end of the central shaft, wherein the aforementioned central shaft penetrates the rubber roller and the end thereof can be placed in the aforementioned introduction groove, and the aforementioned input gear can mesh with the power output end of the aforementioned transmission gear set for transmission; and

[0012] A print head assembly is arranged on the aforementioned machine base, and both ends of the print head assembly have shaft grooves for the central shaft to rotate;

[0013] When the cover plate is closed on the machine base, the connecting shaft pin is limited to the front end of the horizontal part;

[0014] When the cover plate drives the rubber roller assembly to separate from the print head assembly, the connecting shaft pin is rotatably arranged in the vertical portion.

[0015] The installation of the print head assembly is preferably arranged as follows: a support shaft is provided on the machine base, the print head assembly is located above the support shaft, and a compression spring is provided between the print head assembly and the support shaft. Furthermore, a limit groove is provided on the upper end surface of the support shaft, the top end of the compression spring abuts against the bottom surface of the print head assembly, and the bottom end is limited to the limit groove.

[0016] Preferably, the print head assembly includes a support frame and a thermal print head disposed on the support frame, the shaft groove is located at both ends of the support frame, and snap-fitting portions extend outwardly from both ends of the support frame. Correspondingly, the base has a mating portion for limiting the snap-fitting portion to prevent the print head assembly from detaching from the base.

[0017] The guide holes are preferably arranged in the following structure: guide plates are respectively formed at both ends of the inner side of the cover plate, each guide plate is provided with the guide hole, and correspondingly, the base has two connecting shaft pins arranged at intervals from each other that cooperate with the guide holes.

[0018] Furthermore, the front end surface of the base has an insertion hole, and correspondingly, an insertion portion is convexly provided on the inner side of the cover plate. When the cover plate is covered on the base, the insertion portion is inserted into the insertion hole to limit the cover plate from moving upward.

[0019] Furthermore, a touch switch is provided on the base near the insertion hole, and when the cover plate is closed on the base, the insertion portion is inserted into the insertion hole and acts on the touch switch.

[0020] Furthermore, a bearing rotatably matched with the introduction groove and the shaft groove is provided at the end of the central shaft.

[0021] Compared with the prior art, the advantages of the utility model are: after the cover plate is closed, the following three positions can be determined: first, the position of the cover plate and the base is in place; second, the distance between the input gear and the transmission gear assembly is positioned; third, the tangent position of the rubber roller and the thermal print head is accurately pressed on the heating line of the thermal print head.

[0022] There is no need for a complicated disengagement operating mechanism, the overall structure is more compact, which is conducive to thin or design, and the production cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the embodiment box cover.

[0024] Figure 2 for Figure 1 Schematic diagram of the internal structure after the middle cover is hidden.

[0025] Figure 3 for Figure 2 Exploded diagram of .

[0026] Figure 4 for Figure 3 Enlarged view of part A in the middle.

[0027] Figure 5 for Figure 3 Enlarged view of part B in the middle.

[0028] Figure 6 This is the assembly diagram of the cover plate and the rubber roller.

[0029] Figure 7 An enlarged sectional view of the embodiment box cover.

[0030] Figure 8 This is a diagram of the state after the cover is partially opened.

[0031] Fig. 9 This is an enlarged cross-sectional view with the cover partially opened.

[0032] Fig.10 This is the state diagram when the cover rises to the maximum position.

[0033] Fig.11 This is an enlarged cross-sectional view when the cover is raised to the maximum position. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the thermal printer in this embodiment includes a base 1, a transmission gear set 51, a motor 5, a cover plate 6, a rubber roller assembly 2, a print head assembly 3 and a support shaft 4.

[0036] The base 1 is provided with a partition 52 and a connecting shaft pin 18 . The partition 52 is formed with an introduction groove 521 . The front end surface of the base 1 is provided with an insertion hole 15 . A touch switch 14 is provided on the base 1 near the insertion hole 15 .

[0037] Specifically, combined Figure 3 As shown, the base 1 includes a base 14 , a cover plate 12 disposed on the base 14 , and a decorative plate 19 , wherein the decorative plate 19 is disposed on the rear end surface of the cover plate 12 .

[0038] The transmission gear set 51 is rotatably disposed on the machine base 1 and close to the partition plate 52 ; the motor 5 is disposed on the machine base 1 and has an output gear (not shown in the figure) at its power output end that meshes with the power input end of the transmission gear set 51 .

[0039] The cover plate 6 is movably arranged on the base 1, and the rear end of the cover plate 6 forms a paper inlet 1a, and the front end forms a paper outlet 1b. The cover plate 6 has a guide hole 62 for the connecting shaft pin 18 to extend into, and the guide hole 62 includes a horizontal portion 621 and a vertical portion 622 located at the rear end of the horizontal portion 621 and extending downward; specifically, in combination with Figure 6 As shown, guide plates 61 are formed at both ends of the inner side of the cover plate 6, and each guide plate 61 is provided with a guide hole 62. Correspondingly, the cover plate 12 has two connecting shaft pins 18 arranged at intervals and matching with the guide holes 62.

[0040] An insertion portion 63 is convexly disposed on the inner side of the cover plate 6. When the cover plate 6 is covered on the base 1, the insertion portion 63 is inserted into the insertion hole 15 to limit the upward movement of the cover plate 6. At the same time, the insertion portion 63 acts on the touch switch 14, indicating that the host can be started at any time. After the cover plate is opened, the insertion portion 63 is separated from the touch switch 14, and the host cannot be started.

[0041] The rubber roller assembly 2 is rotatably arranged on the inner side of the cover plate 6 and includes a rubber roller 21, a central shaft 22 and an input gear 24 arranged at the end of the central shaft 22. The central shaft 22 passes through the rubber roller 21 and its end can be placed in the introduction groove 521. The input gear 24 can mesh with the power output end of the transmission gear set 51 for transmission; the end of the central shaft 22 is provided with a bearing 23 that rotatably cooperates with the introduction groove 521 and the shaft groove 33.

[0042] The print head assembly 3 is arranged on the base 1. Both ends of the print head assembly 3 have shaft grooves 33 for the central shaft 22 to rotate. The print head assembly 3 includes a support frame 32 and a thermal print head 31 arranged on the support frame 32. The shaft grooves 33 are located at both ends of the support frame 32. Both ends of the support frame 32 extend outwardly with buckling parts 34. Correspondingly, the base 1 has a matching part 17 for the buckling part 34 to limit the print head assembly 3 from leaving the base 1. Specifically, in combination with Figure 4 and Figure 5 As shown, the bottom of the partition plate 52 has two mating portions 17, and the base 14 has two mating portions 17. The partition plate 52 can be made into a modular component with the transmission gear set.

[0043] The support shaft 4 is arranged on the base 14, the print head assembly 3 is located above the support shaft 4, and a compression spring 35 is arranged between the print head assembly 3 and the support shaft 4. The upper end surface of the support shaft 4 has a limiting groove 41, the top end of the compression spring 35 abuts against the bottom surface of the print head assembly 3, and the bottom end is limited on the limiting groove 41.

[0044] like Figure 1 and Figure 7 As shown, the connecting shaft pin 18 is limited to the front end of the horizontal portion 621 of the guide hole 62, and at this time, the cover plate 6 is covered on the base 1.

[0045] like Figure 8 and Fig. 9 As shown, after the cover plate 6 moves forward, the insertion portion 63 disengages from the insertion hole 13 , and at the same time, the connecting shaft pin 18 moves backward along the horizontal portion 621 , and the cover plate 6 flips over a certain angle. At this time, the front end of the cover plate 6 is opened, and the cover plate 6 drives the rubber roller assembly 2 to disengage from the print head assembly 3 .

[0046] like Fig.10 and Fig.11 As shown, the connecting shaft pin 18 moves into the vertical portion 622, and the cover plate 6 drives the rubber roller assembly 2 to flip, and the cover plate is fully opened.

[0047] The above three states can be completed continuously, and the operation is very convenient. Reverse operation can complete the covering of the cover plate 6.

[0048] When the rubber roller assembly is covered with the cover plate, due to the cooperation of the connecting shaft pin and the guide hole, the bearing of the central shaft of the rubber roller assembly is introduced into the guide groove of the partition plate, which can ensure the position of the input gear and the transmission gear set; at the same time, the bearing of the central shaft can also be introduced into the shaft groove in the print head assembly.

[0049] The above-mentioned box cover action realizes the following three functions simultaneously: first, the position of the cover plate and the base is in place; second, the distance between the input gear and the transmission gear assembly is positioned; third, the tangent position of the rubber roller and the thermal print head is accurately pressed on the heating wire of the thermal print head.

Claims

1. A thermal printer, characterized in that include The machine base (1) is provided with a partition (52) and a connecting shaft pin (18), and the partition (52) is formed with an introduction groove (521); A transmission gear set (51) is rotatably disposed on the machine base (1) and close to the partition plate (52); A motor (5) is arranged on the aforementioned machine base (1) and has an output gear at its power output end that meshes with the power input end of the aforementioned transmission gear set (51); A cover plate (6) is movably disposed on the aforementioned machine base (1), the cover plate (6) having a guide hole (62) for the aforementioned connecting shaft pin (18) to extend into, the guide hole (62) comprising a horizontal portion (621) and a vertical portion (622) located at the rear end of the horizontal portion (621) and extending downward; A rubber roller assembly (2) is rotatably disposed inside the aforementioned cover plate (6) and comprises a rubber roller (21), a central shaft (22) and an input gear (24) disposed at the end of the central shaft (22); the aforementioned central shaft (22) penetrates the rubber roller (21) and its end can be placed in the aforementioned introduction groove (521); the aforementioned input gear (24) can mesh with the power output end of the aforementioned transmission gear set (51) for transmission; and A print head assembly (3) is arranged on the aforementioned machine base (1), and both ends of the print head assembly (3) have shaft grooves (33) for the central shaft (22) to be rotatably arranged; When the aforementioned cover plate (6) is covered on the machine base (1), the aforementioned connecting shaft pin (18) is limited to the front end of the horizontal portion (621); When the cover plate (6) drives the rubber roller assembly (2) to separate from the print head assembly (3), the connecting shaft pin (18) is rotatably arranged in the vertical portion (622).

2. The thermal printer according to claim 1, characterized in that A support shaft (4) is provided on the machine base (1), the print head assembly (3) is located above the support shaft (4), and a compression spring (35) is provided between the print head assembly (3) and the support shaft (4).

3. The thermal printer according to claim 2, characterized in that The upper end surface of the support shaft (4) is provided with a limiting groove (41), the top end of the compression spring (35) abuts against the bottom surface of the print head assembly (3), and the bottom end is limited on the aforementioned limiting groove (41).

4. The thermal printer according to claim 2, characterized in that The print head assembly (3) comprises a support frame (32) and a thermal print head (31) arranged on the support frame (32); the shaft groove (33) is located at both ends of the support frame (32); and buckling portions (34) extend outwardly from both ends of the support frame (32); correspondingly, the base (1) has a matching portion (17) for limiting the buckling portion (34) to prevent the print head assembly (3) from detaching from the base (1).

5. The thermal printer according to claim 1, characterized in that Guide plates (61) are respectively formed at both ends of the inner side of the cover plate (6), and each guide plate (61) is provided with the guide hole (62). Correspondingly, the machine base (1) has two connecting shaft pins (18) arranged at intervals from each other and matching with the guide holes (62).

6. The thermal printer according to claim 1, characterized in that The front end surface of the machine base (1) has an insertion hole (15), and correspondingly, an insertion portion (63) is protrudingly provided on the inner side of the cover plate (6). When the cover plate (6) is covered on the machine base (1), the insertion portion (63) is inserted into the insertion hole (15) to limit the cover plate (6) from moving upward.

7. The thermal printer according to claim 6, characterized in that A touch switch (14) is provided on the machine base (1) near the insertion hole (15); when the cover plate (6) is covered on the machine base (1), the insertion portion (63) is inserted into the insertion hole (15) and acts on the touch switch (14).

8. The thermal printer according to claim 1, characterized in that The end of the central shaft (22) is provided with a bearing (23) which is rotatably matched with the introduction groove (521) and the shaft groove (33).

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