Paper roll supporting frame mounting structure and thermal printer

Abstract

A paper roll supporting frame installation structure comprises a lower base and paper roll supporting frames arranged in the lower base, a paper bin for containing a paper roll is formed in the lower base, the pair of paper roll supporting frames are provided with the two opposite sides of the paper bin respectively, and when the paper roll is in an assembled state, the two sides of the paper roll are connected with the paper roll supporting frames respectively and can rotate. The device is characterized in that each pair of paper roll supporting frames comprises a base frame and a movable frame rotationally arranged on the inner side face of the base frame, and the base frames can be transversely and movably arranged in the paper bin so as to adapt to paper rolls with different widths; and the movable frame is provided with a supporting claw which extends into a central hole of the paper roll. The utility model also discloses a thermal printer. The movable arrangement of the base frame can enable a single thermal printer to adapt to printing of paper rolls with different specifications and widths, the operation is simple and flexible, and the application is expanded at the same time. The supporting claw and the paper roll center through hole are convenient to assemble, and operation is easy.

Description

Technical Field

[0001] This utility model relates to a paper roll mounting structure for a thermal printer, and also to a printing device. Background Technology

[0002] Existing thermal printers generally consist of a motor, a transmission mechanism, a frame, a printing roller, and a thermal printhead. The printing roller is rotatably mounted on the frame, while the thermal printhead is positioned adjacent to it, with a gap between them for paper to pass through. The motor drives the printing roller to rotate via the transmission mechanism, thereby pulling the paper to complete the printing operation. A paper roll support is cleverly placed inside the paper tray of the frame, specifically for holding the paper roll.

[0003] Thermal printers come in a variety of models and styles due to their wide range of applications, each often designed for specific paper widths. Unfortunately, most thermal printers have a preset and non-adjustable paper width. If printing needs change, the entire printer often needs to be replaced, resulting in a significant waste of resources.

[0004] Improvements have been proposed, such as the Chinese utility model patent "Adjustable Width Thermal Printer Mechanism" (authorization announcement number CN214056957U) with patent number ZL202022637747.1. This patent flexibly adjusts the distance between the adjusting block and the paper stop block by adjusting the position of the adjusting block, thereby achieving the adjustability of the printing paper width.

[0005] While this improvement enabled adjustable settings for paper feed output, the design of the paper roll support frame failed to keep pace. When encountering narrow paper rolls, the rotational stability of the paper roll on the support frame is poor, and it is prone to shifting, which not only accelerates the wear of the paper roll but also adversely affects print quality. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a paper roll support frame installation structure with adjustable relative spacing, in view of the above-mentioned technical status.

[0007] The second technical problem to be solved by this utility model is to provide a thermal printer with adjustable spacing between paper roll support frames, in view of the above-mentioned technical status quo.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a paper roll support frame installation structure, including a lower base and a paper roll support frame disposed in the lower base. The lower base has a paper compartment for accommodating the paper roll. The paper roll support frame is a pair and is respectively provided with opposite sides of the paper compartment. When the paper roll is in the assembled state, the two sides of the paper roll are respectively connected to the paper roll support frame and can rotate. The characteristic is that each pair of paper roll support frames includes a base frame and a movable frame that can be rotatably disposed on the inner side of the base frame. The base frame is laterally movable in the paper compartment to accommodate paper rolls of different widths. The movable frame has a support claw that extends into the central hole of the paper roll.

[0009] Specifically, the base frame has a connecting portion on at least one side of the paper tank in the axial direction, and the bottom of the connecting portion has a positioning protrusion. Correspondingly, the lower base has a row of positioning grooves on at least one side of the paper tank in the axial direction that are adapted to the aforementioned positioning protrusion.

[0010] Preferably, the cross-section of the positioning protrusion is V-shaped, and correspondingly, the cross-section of the positioning groove is also V-shaped, thereby forming a rack-like shape with a row of positioning grooves.

[0011] Preferably, the support claws are at least two and arranged in a ring on the end face of the movable frame.

[0012] Preferably, the base frame has a shaft in the middle, and correspondingly, the movable frame has a shaft hole in the middle that matches the aforementioned shaft. The support claws are three in number and are evenly arranged around the shaft hole.

[0013] Preferably, the support claw has an S-shaped cross-section and possesses elastic deformation force, thereby forming an elastic clamp on the paper roll and ensuring that the support claw does not slip axially. The S-shaped support claw has two arched structures, which facilitates better elasticity and can provide support over a relatively large range of the inner diameter of the central through hole of the paper roll, avoiding the problem of permanent deformation caused by high insertion resistance when encountering a small central through hole.

[0014] Preferably, the top of the base frame extends outward with a cantilever portion that can be elastically bent under pressure.

[0015] The technical solution adopted by this utility model to solve the second technical problem mentioned above is as follows: a thermal printer, characterized in that it includes an upper cover assembly, a thermal printhead assembly disposed inside the upper cover assembly, a lower base, and a rubber roller disposed on the lower base. The aforementioned upper cover assembly is disposed on the lower base in an openable and closable manner. The axial direction of the rubber roller is parallel to the length direction of the thermal printhead assembly. When the upper cover assembly is closed in the aforementioned lower base, the aforementioned rubber roller is pressed and engaged with the thermal printhead assembly, and the printing paper is pulled and clamped through the gap between the rubber roller and the thermal printhead assembly.

[0016] Furthermore, the top of the base frame extends outward with a cantilever portion that can be elastically bent under pressure. When the upper cover assembly is closed in the aforementioned lower base, the aforementioned cantilever portion presses against the inner wall of the upper cover assembly, thereby stabilizing the positioning of the paper roll support frame.

[0017] Furthermore, the inner side of the upper cover assembly is rotatably provided with a paper guide roller that can roll into contact with the printing paper.

[0018] Compared with existing technologies, the advantages of this invention are as follows: the movable base allows a single thermal printer to adapt to printing paper rolls of different widths, making operation simple and flexible, while also expanding its applications. The assembly of the support claw with the central through-hole of the paper roll is convenient and easy to operate; after assembly, the support claw rotates flexibly, ensuring smooth paper output. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure after the upper cover assembly and the lower base are closed in the embodiment.

[0020] Figure 2 This is a schematic diagram of the structure after the upper cover assembly and the lower base are flipped open in the embodiment.

[0021] Figure 3 for Figure 2 Enlarged view of the paper roll support frame.

[0022] Figure 4 for Figure 3 Exploded assembly diagram.

[0023] Figure 5 for Figure 4 Another structural diagram of the central frame.

[0024] Figure 6 for Figure 2 Another magnified view of the lower base.

[0025] Figure 7 This is a schematic diagram of the paper roll after installation.

[0026] Figure 8 This is a three-dimensional sectional view of the embodiment in its working state. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 1 , Figure 2 and Figure 7As shown, in this embodiment, there is a thermal printer top cover assembly 1, a thermal printhead assembly 3 disposed inside the top cover assembly 1, a lower base 2, and a rubber roller 4 disposed on the lower base 2. The top cover assembly 1 is disposed on the lower base 2 in an openable and closable manner. The axial direction of the rubber roller 4 is parallel to the length direction of the thermal printhead assembly. When the top cover assembly 1 is closed in the lower base 2, the rubber roller 4 and the thermal printhead assembly 3 are pressed together, and the printing paper is pulled and clamped through the gap between the rubber roller 4 and the thermal printhead assembly 3.

[0029] With the upper cover assembly 1 closed to the lower base 2, a paper outlet 1a is formed between them. A paper cutting assembly 41 is located near the paper outlet 1a on the lower base 2. Figure 7 As shown, the lower base 2 has a paper compartment 21 for feeding paper rolls 10.

[0030] The inner side of the top cover assembly 1 is provided with a paper guide roller 8 that can roll into contact with the printing paper to reduce the contact between the printing paper and the inner side of the top cover assembly. The rolling friction between the paper guide roller 8 and the printing paper can reduce resistance. If the design of the paper guide roller is omitted, there will be more opportunities for sliding friction between the printing paper and the inner side of the top cover assembly. The sliding friction resistance is large, which may wear down the coating on the printing surface of the printing paper and form printing stains.

[0031] like Figures 3-6 As shown, the paper roll support frame 5 is located inside the paper compartment 21 of the lower base 2. There is a pair of paper roll support frames 5, each located on opposite sides of the paper compartment 21. Figure 7 As shown, the paper roll 10 is in the assembled state, with both sides of the paper roll connected to the paper roll support frame 5 and able to rotate.

[0032] Each pair of paper roll support frames 5 includes a base frame 51 and a movable frame 52 rotatably disposed on the inner side of the base frame 51. The base frame 51 is laterally movable within the paper compartment 21 to accommodate paper rolls of different widths. The movable frame 52 has a support claw 521 that extends into the central hole of the paper roll. After the support claw 521 is inserted into the central through hole of the paper roll 10, it can elastically abut against the hole wall. (See reference...) Figure 8 As shown.

[0033] In this embodiment, the positioning protrusion 512 has a V-shaped cross-section, and correspondingly, the positioning groove 22 also has a V-shaped cross-section, thus forming a rack-like structure with a row of positioning grooves 22. The V-shaped inclined surface of the positioning protrusion 512 contacts the V-shaped groove wall of the positioning groove 22, and lateral positioning is achieved through the inclined surface guidance.

[0034] The positioning protrusion 512 and the positioning groove 22 can limit the width of the paper roll so that a single thermal printer can adapt to printing paper rolls of different widths. The adjustment is convenient and easy to operate. After adjustment, the positioning is accurate and not easy to shift.

[0035] The base frame 51 has connecting parts 511 on both sides of the paper tank 21 in the axial direction. The bottom of the connecting parts 511 has positioning protrusions 512. Correspondingly, the lower base 2 has a row of positioning grooves 22 that are adapted to the positioning protrusions 512 on both sides of the paper tank 21 in the axial direction.

[0036] The top of the base frame 51 extends outward with a cantilever portion 513 that can elastically bend under pressure. (Combined) Figure 8 As shown, with the upper cover assembly 1 closed to the lower base 2, the end of the cantilever portion 513 presses against the inner wall of the upper cover assembly 1, thereby stabilizing the limiting position of the paper roll support frame 5. The elastic bending of the cantilever portion 513 generates a reverse force, which counteracts the outward pushing force when the paper roll 10 rotates, thus preventing it from detaching due to the outward pushing force generated when the paper roll 10 rotates.

[0037] The base frame 51 has a shaft portion 514 in its middle. Correspondingly, the movable frame 52 has a shaft hole 522 in its middle that matches the shaft portion 514. After the shaft hole 522 of the movable frame 52 is assembled with the shaft portion 514, it is positioned and restricted by screws 53 to prevent it from disengaging from the shaft portion. There are three support claws 521, which are evenly arranged around the shaft hole 522. The S-shaped cross-section of the support claws 521 allows them to undergo elastic deformation under radial force, thereby clamping the inner wall of the central through hole of the paper roll 10. The S-shape here can be a rounded transition or a right-angle transition. The S-shaped support claws 521 have two arched structures, which facilitates better elasticity and can achieve support over a relatively large range of the inner diameter of the central through hole of the paper roll, avoiding the problem of permanent deformation caused by high insertion resistance when encountering a small central through hole.

[0038] The movable base allows a single thermal printer to adapt to printing paper rolls of different widths, offering simple and flexible operation while expanding its applications. The assembly of the support claws with the central through-hole of the paper roll is also convenient and easy to operate.

Claims

1. A paper roll support frame mounting structure, comprising a lower base (2) and a paper roll support frame (5) disposed within the lower base (2), wherein the lower base (2) has a paper compartment (21) for accommodating the paper roll, and the paper roll support frames (5) are a pair with the paper compartments (21) respectively on opposite sides. When the paper roll is in an assembled state, both sides of the paper roll are connected to the paper roll support frame (5) and are rotatable. The paper roll is characterized in that... Each pair of paper roll support frames (5) includes a base frame (51) and a movable frame (52) rotatably disposed on the inner side of the base frame (51). The base frame (51) is laterally movable within the paper bin (21) to accommodate paper rolls of different widths. The movable frame (52) has a support claw (521) that extends into the center hole of the paper roll.

2. The paper roll support frame mounting structure according to claim 1, characterized by The base frame (51) has a connecting part (511) on at least one side of the paper tank (21) in the axial direction. The bottom of the connecting part (511) has a positioning protrusion (512). Correspondingly, the lower base (2) has a row of positioning grooves (22) that are adapted to the aforementioned positioning protrusions (512) on at least one side of the paper tank (21) in the axial direction.

3. The paper roll support frame mounting structure according to claim 2, characterized by The cross-section of the positioning protrusion (512) is V-shaped, and correspondingly, the cross-section of the positioning groove (22) is also V-shaped, thereby forming a rack-like shape with a row of positioning grooves (22).

4. The paper roll support frame mounting structure according to claim 1, characterized by The support claws (521) are at least two and arranged in a ring on the end face of the movable frame (52).

5. The paper roll support frame mounting structure according to claim 4, characterized by The base frame (51) has a shaft portion (514) in the middle. Correspondingly, the movable frame (52) has a shaft hole (522) in the middle that is adapted to the aforementioned shaft portion (514). The support claws (521) are three in number and are evenly arranged around the shaft hole (522).

6. The paper roll support frame mounting structure according to claim 1 or 4, characterized by The support claw (521) has an S-shaped cross section and elastic deformation force, thereby forming an elastic clamping force on the paper roll.

7. The paper roll support frame mounting structure according to claim 1, characterized by The top of the base frame (51) extends outward with a cantilever (513) that can be elastically bent under pressure.

8. A thermal printer having the paper roll support frame mounting structure according to any one of claims 1 to 6, characterized by The device includes an upper cover assembly (1), a thermal printhead assembly (3) disposed inside the upper cover assembly (1), a lower base (2), and a rubber roller (4) disposed on the lower base (2). The upper cover assembly (1) is disposed on the lower base (2) in an openable and closable manner. The axial direction of the rubber roller (4) is parallel to the length direction of the thermal printhead assembly (3). When the upper cover assembly (1) is closed on the lower base (2), the rubber roller (4) is pressed and engaged with the thermal printhead assembly (3), and the printing paper is pulled and clamped through the gap between the rubber roller (4) and the thermal printhead assembly (3).

9. The thermal printer according to claim 8, characterized by The top of the base frame (51) extends outward with a cantilever portion (513) that can be elastically bent under pressure. When the upper cover assembly (1) is closed to the aforementioned lower base (2), the aforementioned cantilever portion (513) is pressed against the inner wall of the upper cover assembly (1) to stabilize the limiting position of the paper roll support frame (5).

10. The thermal printer according to claim 8, characterized by The inner side of the top cover assembly (1) is provided with a paper guide roller (8) that can roll into contact with the printing paper.

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