Anti-rollback ribbon cartridge

Abstract

The utility model relates to the technical field of printing supplies, in particular to an anti-rollback ribbon cartridge, which comprises a cartridge body and a belt wheel, the cartridge body is provided with a mounting column, the outer side of the mounting column is integrally provided with a plurality of elastic arms which are uniformly distributed along the circumferential direction, the belt wheel is sleeved on the mounting column, and the inner ring of the belt wheel is always in compression joint with the elastic arms; according to the ribbon cartridge, the plurality of elastic arms are integrally formed on the outer side of the mounting column, the structure is simple, assembly is not needed, the production and assembly cost can be reduced, the assembly efficiency can be improved, the elastic arms are always in compression joint with the inner ring of the belt wheel so as to provide friction force for the belt wheel to prevent the belt wheel from rotating, no assembly gap exists between the elastic arms and the mounting column, and the assembly efficiency is improved. The problem that the belt wheel drives the elastic arm to rotate relative to the mounting column, and consequently the printing medium belt retreats can be solved.

Description

Technical Field

[0001] This utility model relates to the field of printing consumables technology, and in particular to a ribbon cartridge that prevents backflow. Background Technology

[0002] A ribbon cartridge includes a cartridge body and a pulley rotatably mounted inside the cartridge body. The printing media tape on the pulley exits from the tape outlet on the cartridge body. Without driving force, the pulley will cause the printing media tape to rotate forward or backward, causing the printing media tape to slip back and loosen. The outermost printing media tape is prone to sliding down and getting tangled on other parts inside the cartridge body, causing the printing media tape to fold or wrinkle during the printing process, resulting in broken lines and incomplete text, affecting print quality, and in severe cases, rendering the ribbon cartridge unusable.

[0003] To avoid the aforementioned problems, existing ribbon cartridges have mounting posts inside the cartridge, with pulleys fitted onto the mounting posts. A restraint is installed between the pulley and the mounting post to prevent the pulley from reversing. The applicant has found that existing ribbon cartridges have a complex structure, high manufacturing costs, and an assembly gap between the restraint and the mounting post, resulting in the pulley still experiencing a small-angle retraction problem. Utility Model Content

[0004] To achieve the above objectives, this utility model provides an anti-backflow ribbon box, including a box body and a pulley. The box body is provided with a mounting post, and the outer side of the mounting post is integrally formed with a plurality of elastic arms evenly distributed along the circumference. The pulley is sleeved on the mounting post, and its inner ring is always pressed against the elastic arms.

[0005] In some possible embodiments, the elastic arm presses against the middle of the inner ring of the pulley.

[0006] In some possible embodiments, the side of the mounting post is formed with a reinforcing rib, the reinforcing rib protruding from the surface of the housing along the axial direction of the mounting post to the middle position of the mounting post, and the elastic arm extending from one end of the reinforcing rib along the circumference of the mounting post.

[0007] In some possible embodiments, the elastic arm has a fixed end and a free end, the fixed end being integrally formed with the reinforcing rib, and the free end extending circumferentially along the mounting post to press against the inner ring of the pulley.

[0008] In some possible embodiments, the end of the free end is rounded and makes line contact with the inner ring of the pulley.

[0009] In some possible embodiments, the elastic arm extends counterclockwise circumferentially from the upper end of the reinforcing rib.

[0010] Compared with the prior art, the advantages of this utility model are as follows: The ribbon cartridge of this utility model has several elastic arms integrally formed on the outside of the mounting post, which is simple in structure, requires no assembly, reduces production and assembly costs and improves assembly efficiency. The elastic arms are always pressed against the inner ring of the pulley to provide friction to prevent the pulley from rotating. Moreover, there is no assembly gap between the elastic arms and the mounting post, which can avoid the problem of the printing media tape retraction caused by the pulley driving the elastic arms to rotate relative to the mounting post. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 An exploded view of the mating structure of the ribbon box provided in an embodiment of this utility model;

[0013] Figure 2 A top view of the structure for mounting pulleys on a box provided in an embodiment of this utility model.

[0014] The reference numerals in the attached figures are as follows: 10 for the box body, 11 for the mounting post, 12 for the elastic arm, 13 for the reinforcing rib, 121 for the fixed end, 122 for the free end, 20 for the cover, and 30 for the pulley. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0016] Reference Figure 1 and Figure 2The illustrated anti-reverse ribbon cartridge includes a cartridge body 10, a cover 20, and a pulley 30. The printing media tape is wound and stored on the pulley 30. The cover 20 can be fitted onto the cartridge body 10 to form a cavity between the two to accommodate the pulley 30 and the printing media tape. The outer side of the mounting post 11 has several elastic arms 12 evenly distributed along its circumference. The pulley 30 is sleeved on the mounting post 11. The elastic arms 12 are always pressed against the inner ring of the pulley 30 so that the elastic arms 12 always provide a frictional force to prevent it from rotating without driving force. The elastic arms 12 and the mounting post 11 are integrally formed, specifically, they can be integrally injection molded to reduce the number of parts in the ribbon cartridge, optimize the production assembly process, reduce production assembly costs, and improve assembly efficiency. Moreover, there is no assembly gap between the elastic arms 12 and the mounting post 11, so the problem of the printing media tape retracting at a small angle due to the pulley 30 driving the elastic arms 12 to rotate relative to the mounting post 11 will not occur.

[0017] In some possible embodiments, the elastic arm 12 presses against the middle position of the inner ring of the pulley 30 to ensure that the pulley 30 is balanced on the housing 10 and to avoid problems such as shaking when the pulley 30 is rotated by the driving force; furthermore, the elastic arm 12 can be set to two, three or four and all the elastic arms 12 are evenly distributed along the outer periphery of the mounting post 11.

[0018] In some possible embodiments, refer to Figure 1 As shown, a reinforcing rib 13 is also formed on the side of the mounting post 11. One end of the reinforcing rib 13 protrudes from the surface of the box body 10, and the other side is always connected to the mounting post 11. The reinforcing rib 13 extends along the axial direction of the mounting post 11 to the middle position of the mounting post 11. The elastic arm 12 extends in an arc along the circumference of the mounting post 11 from the end of the reinforcing rib 13 located in the middle of the mounting post 11. The elastic arm 12, the reinforcing rib 13, and the mounting post 11 are all integrally formed with the box body 10, that is, they can be obtained by injection molding with the box body 10 without assembly, which improves efficiency. Moreover, there is no assembly gap between them, which effectively avoids the problem of small-angle retraction of the printing media tape.

[0019] In some possible embodiments, the elastic arm 12 has a fixed end 121 and a free end 122, wherein the fixed end 121 is integrally formed with the reinforcing rib 13, and the free end 122 extends circumferentially along the mounting post 11 to the inner ring of the pressing pulley 30. In this embodiment, only the free end 122 of the elastic arm 12 contacts the pulley 30 to reduce the contact area between the elastic arm 12 and the pulley 30, making it easier for the pulley 30 to be fitted onto the mounting post 11. Furthermore, the end of the free end 122 is rounded, and the end of the free end 122 is in line contact with the inner ring of the pulley 30.

[0020] In some possible embodiments, the elastic arm 12 extends counterclockwise from the upper end of the reinforcing rib 13 in the circumferential direction. At this time, the working direction of the pulley 30 is clockwise. The pressure applied by the pulley 30 to the elastic arm 12 can force the elastic arm 12 to elastically deform in the direction closer to the mounting post 11, so as to reduce the friction between the elastic arm 12 and the pulley 30 and ensure that the pulley 30 can rotate clockwise normally. When the pulley 30 rotates counterclockwise, the pressure applied by the pulley 30 to the elastic arm 12 will force the elastic arm 12 to elastically deform in the direction away from the mounting post 11, so as to increase the friction between the pulley 30 and the elastic arm 12, thereby preventing the pulley 30 from reversing.

[0021] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A backspace prevention ribbon cartridge, characterized by, The utility model relates to a box body (10) and a pulley (30), the box body (10) is provided with mounting column (11), the outside of mounting column (11) is integrally formed with a plurality of elastic arms (12) that are evenly distributed in the circumferential direction, the pulley (30) is sleeved on the mounting column (11) and the inner ring of pulley (30) always pressure -welds the elastic arm (12).

2. The anti-backup ribbon cartridge of claim 1 wherein, The elastic arm (12) pressure -welds the middle position of the inner ring of pulley (30).

3. The anti-backup ribbon cartridge of claim 2 wherein, The side of mounting column (11) is formed with reinforcing rib (13), reinforcing rib (13) protrudes from the surface of box body (10) to the middle position of mounting column (11) along the axial direction of mounting column (11), and the elastic arm (12) extends from one end of reinforcing rib (13) along the circumferential direction of mounting column (11).

4. The anti-backup ribbon cartridge of claim 3 wherein, The elastic arm (12) has fixed end (121) and free end (122), the fixed end (121) is integrally formed with reinforcing rib (13), and the free end (122) extends to the inner ring of pulley (30) along the circumferential direction of mounting column (11) and pressure -welds.

5. The anti-backup ribbon cartridge of claim 4 wherein, The end of free end (122) is rounded and in line contact with the inner ring of pulley (30).

6. The anti-backup ribbon cartridge of claim 3 wherein, The elastic arm (12) extends counterclockwise from the upper end of reinforcing rib (13) along the circumferential direction.

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