Thermal printer core

Abstract

A thermal printer core, comprising a base frame, a frame, a moving knife assembly, a fixed knife, a print head assembly, a driving mechanism and a rubber roller, the frame is reversibly arranged on the base frame, characterized in that the base frame is provided with a first reset member for resetting the moving knife assembly, the inner side of the moving knife assembly has a rack part, the driving mechanism comprises a driving motor, a cam, a transmission gear set, a first double gear and a slider, the first double gear is rotatably arranged on the cam and the power input end is engaged with the driving output gear for transmission, the power output end is engaged with the power input end of the transmission gear set for transmission, and the slider is arranged on the base frame and the bottom end can drive the moving part to move, the slider is pressed down to drive the cam to rotate, and then the first double gear and the second double gear are disengaged, the moving knife assembly is automatically reset, the moving knife assembly is quickly reset in the whole process, and the problem of knife jamming failure is completely solved.

Description

Technical Field

[0001] This invention relates to a printing apparatus, and more particularly to a thermal printer mechanism. Background Technology

[0002] Existing thermal printers generally include a base frame, a motor, a transmission gear assembly, a printhead assembly, and a rotatable rubber roller mounted on the base frame. The power input end of the transmission gear assembly meshes with the motor's drive output gear, and the power output end meshes with a rubber roller gear located at the end of the rubber roller. The rubber roller is used to move the printing paper. There is a paper feed channel between the rubber roller and the printhead assembly. The printhead assembly generally includes a printhead (TPH), a printhead support, a compression spring, and a compression spring support frame. The printhead is mounted on the printhead support, and the two ends of the compression spring support frame are located at both ends of the base frame. The two ends of the compression spring abut against the printhead support frame and the compression spring support frame, respectively, so that the printhead can press the printing paper firmly against the surface of the rubber roller. When loading or correcting the printing paper, this is generally achieved by disassembling the rubber roller. The rubber roller generally has two bearings at both ends, and the base frame has grooves for the bearings. The grooves are semi-circular in shape, and the bearings are always located in the grooves during operation. When paper needs to be loaded, the rubber roller can be easily disengaged from the grooves. However, the following shortcomings exist: the bearing moves too much within the groove, affecting the normal operation of the rubber roller.

[0003] The applicant has applied for a thermal printer patent, as detailed in Chinese Invention Patent No. ZL201710535432.6, entitled "Thermal Printer" (Authorization Announcement No. CN107310276B). In this patent, when paper is loaded or needs correction, a gentle lever movement causes the mounting bracket to spring apart from the base frame. Simultaneously, the first and second swing elements act on the fixed blade, causing it to sink vertically. This reduces the contact pressure between the moving blade and the fixed blade, alleviating resistance to the moving blade's return and allowing it to return smoothly. However, in actual use, when paper that cannot be cut gets stuck between the moving and fixed blades (commonly called a paper jam), the downward movement of the fixed blade is insufficient to reduce the resistance to the moving blade's return, causing the moving blade to fail to return and resulting in functional failure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a thermal printer mechanism in which the moving blade assembly can still quickly return to its original position after a paper jam, in view of the above-mentioned technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a thermal printer cartridge, comprising a base frame, a frame, a moving blade assembly, a fixed blade, a printhead assembly, a drive mechanism, and a rubber roller. The aforementioned frame is rotatably mounted on the base frame, the aforementioned printhead assembly and fixed blade are mounted on the frame, the aforementioned rubber roller is rotatably mounted on the base frame, the aforementioned moving blade assembly is mounted on the base frame, and the aforementioned drive mechanism is mounted on the base frame and can drive the moving blade assembly to move. The invention is characterized in that a first reset member is provided on the base frame to reset the moving blade assembly, and the inner side of the moving blade assembly has a rack portion.

[0006] The drive mechanism includes

[0007] The drive motor has an active output gear at the power output end;

[0008] A cam is rotatably mounted on one side of the base frame, with a second reset member connected to one end and a toggle part formed at the other end;

[0009] The transmission gear set is rotatably mounted on one side of the base frame, and its power output end meshes with the aforementioned rack section for transmission.

[0010] The first double gear is rotatably mounted on the aforementioned cam, and its power input end can mesh with the aforementioned drive output gear for transmission, while its power output end meshes with the power input end of the aforementioned transmission gear set for transmission; and

[0011] The slider is mounted on the base frame and its bottom end can drive the actuating part to move.

[0012] Furthermore, rack portions are formed on both sides of the moving blade assembly, and the transmission gear set includes...

[0013] The connecting shaft is rotatably mounted on the base frame;

[0014] The first input gear is located at one end of the aforementioned connecting shaft and meshes with the corresponding gear section for transmission.

[0015] The second input gear is located at the other end of the aforementioned connecting shaft and meshes with the corresponding gear section for transmission; and

[0016] The second double gear has its power output end meshing with the power output end of the first double gear, and its power input end meshing with the aforementioned first input gear.

[0017] The preferred installation configuration of the first reset component is as follows: an auxiliary gear is provided on the base frame, which meshes with the second input gear for transmission; the first reset component is a torsion spring provided on the auxiliary gear, which can provide the auxiliary gear with momentum after rotation.

[0018] Preferably, the moving tool assembly includes a moving tool holder and a moving blade disposed on the moving tool holder, and the rack portion is formed on the moving tool holder.

[0019] Preferably, the second reset element is a tension spring, one end of which is connected to the base frame and the other end is connected to the cam.

[0020] Furthermore, one side of the base frame has a protruding shaft portion, which is arc-shaped. The cam includes a first body and a protrusion located on one side of the body. The first body is cylindrical and has an inner cavity. A notch is formed on one side of the inner cavity. The first body is rotatably mounted on the aforementioned shaft portion. The aforementioned protrusion has a pin portion for the first double gear to rotate. The actuating part is located on one side of the first body. The active output gear is located in the inner cavity of the first body and meshes with the first double gear through the notch for transmission.

[0021] The upper end face of the base frame is provided with an anti-sticking protective component near the rubber roller. Furthermore, the paper feed end and the paper output end of the base frame are respectively provided with a first rolling protective component and a second rolling protective component. In the paper feeding and printing state, the outer end faces of the aforementioned first rolling protective component and second rolling protective component can roll into contact with the adhesive surface of the label without backing paper.

[0022] When the printer is working, the adhesive side of the label without backing paper first contacts the anti-sticking protective component, preventing adhesive from adhering and ensuring normal and long-term printing. The design of the first and second rolling protective components allows rolling friction between the adhesive side of the label without backing paper and the protective components, thus reducing wear on the anti-sticking protective components.

[0023] Preferably, the first rolling protection member includes a second body rotatably disposed on the upper end face of the base frame and an anti-sticking layer on the outer side of the second body.

[0024] Preferably, the second rolling protection component includes a shaft rotatably disposed on the upper end face of the base frame and an anti-sticking rubber sleeve sleeved on the shaft.

[0025] Preferably, the anti-sticking protective element is arranged in a strip along the paper feeding direction, and at least one end of the anti-sticking protective element is disposed adjacent to the rubber roller.

[0026] Compared with the prior art, the advantages of the present invention are: the slider presses down to drive the cam to rotate, thereby disengaging the first double gear and the second double gear, and the moving tool assembly automatically returns to its original position. The moving tool assembly returns to its original position quickly throughout the process, completely solving the problem of tool jamming failure. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment.

[0028] Figure 2 This is a schematic diagram of the frame after it has been flipped in the embodiment.

[0029] Figure 3This is a schematic diagram of the base frame structure in the embodiment.

[0030] Figure 4 This is an enlarged view of the first rolling protection component.

[0031] Figure 5 This is an enlarged view of the second rolling protection component.

[0032] Figure 6 for Figure 5 The exploded diagram.

[0033] Figure 7 This is an enlarged view of the drive mechanism.

[0034] Figure 8 for Figure 7 Partially exploded diagram.

[0035] Figure 9 This is a combined diagram of the drive mechanism (drive motor omitted) and the moving blade assembly.

[0036] Figure 10 for Figure 9 Enlarged view of the auxiliary gear and the first reset component.

[0037] Figure 11 for Figure 10 Exploded view.

[0038] Figure 12 This is a schematic diagram of the base frame after the cover plate and cam have been removed.

[0039] Figure 13 This is an enlarged view of the cam.

[0040] Figure 14 This is a magnified view of the cam from another perspective. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] like Figure 1 and Figure 2 As shown, the thermal printer module in this embodiment includes a base frame 1, a frame 3, a moving blade assembly 2, a fixed blade 32, a printhead assembly 31, a drive mechanism 4, a rubber roller 11, and a print motor 100. The frame 3 is rotatably mounted on the base frame 1. The printhead assembly 31 and the fixed blade 32 assembly are mounted on the frame 3. The rubber roller 11 is rotatably mounted on the base frame 1. The moving blade assembly 2 is mounted on the base frame 1. The drive mechanism 4 is mounted on the base frame 1 and can drive the moving blade assembly 2. The print motor 100 can drive the rubber roller 11 to rotate through a transmission gear assembly 101. In this embodiment, the base frame 1 has cover plates 14 on both sides. One cover plate 14 covers the transmission gear assembly 101, and the other cover plate 14 covers the drive mechanism 4.

[0043] like Figure 2 and Figure 3 As shown, the upper end face of the base frame 1 is provided with an anti-sticking protective member 12 near the adhesive roller 11. Furthermore, the paper feed end and the paper output end of the base frame 1 are respectively provided with a first rolling protective member 6 and a second rolling protective member 7. When the paper is being fed and printed, the outer end faces of the first rolling protective member 6 and the second rolling protective member 7 can roll and contact the adhesive surface of the label without backing paper.

[0044] Combination Figure 4 As shown, the first rolling protection member 6 in this embodiment includes a second body 61 rotatably disposed on the upper end face of the base frame 1 and an anti-sticking layer 62 on the outside of the second body 61.

[0045] Combination Figure 5 and Figure 6 As shown, the second rolling protection member 7 includes a rotating shaft 71 rotatably disposed on the upper end face of the base frame 1 and an anti-stick sleeve 72 sleeved on the rotating shaft 71.

[0046] The anti-stick protective elements 12 are arranged in strips along the paper feeding direction. One end of each anti-stick protective element 12 is located near the rubber roller 11, which facilitates a smooth transition.

[0047] When the printer is working, the adhesive side of the label without backing paper first contacts the anti-sticking protective component, preventing adhesive from adhering and ensuring normal and long-term printing. The design of the first and second rolling protective components allows rolling friction between the adhesive side of the label without backing paper and the protective components, thus reducing wear on the anti-sticking protective components.

[0048] Combination Figure 7 and Figure 8 As shown, the drive mechanism 4 includes a drive motor 41, a cam 43, a connecting shaft 46, a first input gear 461, a second input gear 462, a first double gear 44, a second double gear 45, and a slider 47. The drive motor 41 has an active output gear 42 at its power output end.

[0049] Cam 43 is rotatably mounted on one side of base frame 1, with a second reset member 471 connected to one end and a toggle part 433 formed on the other end; combined with Figure 12 As shown, one side of the base frame 1 has a protruding shaft portion 13, which is arc-shaped and combined with... Figure 13 and Figure 14As shown, the cam 43 in this embodiment includes a first body 431 and a protrusion 432 located on one side of the first body 431. The first body 431 is cylindrical and has an inner cavity. A notch 435 is formed on one side of the inner cavity. The first body 431 is rotatably mounted on the shaft 13. The protrusion 432 has a pin 434 for the first double gear 44 to rotate. The actuating part 433 is located on one side of the first body 431. The active output gear 42 is located in the inner cavity of the first body 431 and meshes with the first double gear 44 through the notch 435 for transmission.

[0050] In this embodiment, the second reset member 471 is a tension spring, one end of which is connected to the base frame 1 and the other end is connected to the protrusion 436 of the cam 43.

[0051] The connecting shaft 46 is rotatably mounted on the base frame 1; the first input gear 461 is located at one end of the connecting shaft 46 and meshes with the corresponding gear part for transmission; the second input gear 462 is located at the other end of the connecting shaft 46 and meshes with the corresponding gear part for transmission; the power output end of the second double gear 45 meshes with the power output end of the first double gear 44 for transmission, and the power input end meshes with the first input gear 461 for transmission.

[0052] The first double gear 44 is rotatably mounted on the cam 43 and its power input end can mesh with the drive output gear 42 for transmission.

[0053] The slider 47 is mounted on the base frame 1 and its bottom end can drive the actuating part 433 to move. Here, the bottom surface of the slider 47 and the top surface of the actuating part 433 are both inclined surfaces.

[0054] Combination Figure 8 As shown, the moving blade assembly 2 includes a moving blade holder 21 and a moving blade 22 disposed on the moving blade holder 21. Rack portions 23 are respectively formed on the inner walls of both sides of the moving blade holder 21. A guard plate 24 is provided on the outer side of the moving blade 22.

[0055] Combination Figures 9-11 As shown, in this embodiment, the base frame 1 is provided with an auxiliary gear 48, which meshes with the second input gear 462 for transmission. The first reset member 49 is a torsion spring provided on the auxiliary gear 48. The torsion spring can provide the auxiliary gear 48 with momentum after rotation, thereby allowing the moving tool assembly to reset.

[0056] During normal operation, under the pulling force of the second reset member 471, the drive cam 43 is in a fixed position, and the first double gear 44 and the second double gear 45 on the drive cam 43 are always in a meshing state.

[0057] When a tool jam occurs, the moving blade is not in its initial position. At this time, the frame 3 is flipped to open the fixed blade position. The slider 47 is manually pressed, causing it to press against the actuating part 433, which drives the cam 43. The cam 43 rotates clockwise, disengaging the first double gear 44 from the second double gear 45. The first reset member 49 acts on the auxiliary gear 48, causing it to rotate and drive the second input gear 462, which in turn drives the rack part 23, thus pulling the moving blade assembly back to its initial position. The entire process ensures rapid return of the moving blade assembly, completely resolving the tool jamming problem.

Claims

1. A thermal printer cartridge, comprising a base frame (1), a frame (3), a moving blade assembly (2), a fixed blade (32), a printhead assembly (31), a drive mechanism, and a rubber roller, wherein the frame (3) is rotatably mounted on the base frame (1), the printhead assembly (31) and the fixed blade (32) assembly are mounted on the frame (3), the rubber roller is rotatably mounted on the base frame (1), the moving blade assembly (2) is mounted on the base frame (1), and the drive mechanism is mounted on the base frame (1) and can drive the moving blade assembly (2) to operate, characterized in that... The base frame (1) is provided with a first reset member (49) that can reset the moving blade assembly (2). The moving blade assembly (2) has a rack portion (23) on its inner side. The drive mechanism (4) includes... The drive motor (41) has an active output gear (42) at the power output end; A cam (43) is rotatably mounted on one side of the base frame (1), with a second reset member (471) connected to one end and a toggle part (433) formed on the other end; The transmission gear set is rotatably mounted on one side of the base frame (1), and the power output end meshes with the aforementioned rack part (23) for transmission; A first double gear (44) is rotatably mounted on the aforementioned cam (43) and its power input end can mesh with the aforementioned drive output gear (42) for transmission, while its power output end meshes with the power input end of the aforementioned transmission gear set for transmission; and The slider (47) is mounted on the base frame (1) and its bottom end can drive the actuating part (433) to move; The base frame (1) has a raised shaft (13) on one side, which is arc-shaped. The cam (43) includes a first body (431) and a protrusion (432) located on one side of the first body (431). The first body (431) is cylindrical and has an inner cavity. A notch (435) is formed on one side of the inner cavity. The first body (431) is rotatably mounted on the shaft (13). The protrusion (432) has a pin (434) for the first double gear (44) to rotate. The actuating part (433) is located on one side of the first body (431). The active output gear (42) is located in the inner cavity of the first body (431) and meshes with the first double gear (44) through the notch (435) for transmission.

2. The thermal printer cartridge according to claim 1, characterized in that... The moving blade assembly (2) has rack portions (23) formed on both sides, and the transmission gear set includes... The connecting shaft (46) is rotatably mounted on the base frame (1); The first input gear (461) is located at one end of the aforementioned connecting shaft (46) and meshes with the corresponding gear part for transmission; The second input gear (462) is located at the other end of the aforementioned connecting shaft (46) and meshes with the corresponding gear part for transmission; as well as The second double gear (45) meshes with the power output end of the first double gear (44) for transmission, and its power input end meshes with the aforementioned first input gear (461) for transmission.

3. The thermal printer cartridge according to claim 2, characterized in that... The base frame (1) is provided with an auxiliary gear (48), which meshes with the second input gear (462) for transmission. The first reset member (49) is a torsion spring provided on the auxiliary gear (48), which can provide the auxiliary gear (48) with energy after rotation.

4. The thermal printer cartridge according to claim 1, characterized in that... The moving blade assembly (2) includes a moving blade holder (21) and a moving blade (22) disposed on the moving blade holder (21), and the rack portion (23) is formed on the moving blade holder (21).

5. The thermal printer cartridge according to claim 1, characterized in that... The second reset member (471) is a tension spring, one end of which is connected to the base frame (1) and the other end is connected to the cam (43).

6. The thermal printer cartridge according to claim 1, characterized in that... The upper end face of the base frame (1) is provided with an anti-sticking protective member (12) near the glue roller (11). The paper feed end and the paper output end of the base frame (1) are respectively provided with a first rolling protective member (6) and a second rolling protective member (7). When the paper is being fed and printed, the outer end faces of the aforementioned first rolling protective member (6) and second rolling protective member (7) can roll and contact with the adhesive surface of the label without backing paper.

7. The thermal printer cartridge according to claim 6, characterized in that... The first rolling protection member (6) includes a second body (61) rotatably disposed on the upper end face of the base frame (1) and an anti-stick layer (62) on the outside of the second body (61).

8. The thermal printer cartridge according to claim 6, characterized in that... The second rolling protection component (7) includes a rotating shaft (71) rotatably mounted on the upper end face of the base frame (1) and an anti-stick sleeve (72) sleeved on the rotating shaft (71).

9. The thermal printer cartridge according to claim 6, characterized in that... The anti-stick protective element (12) is arranged in a strip along the paper feeding direction, and at least one end of the anti-stick protective element (12) is located adjacent to the glue roller (11).

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