Ribbon gear for printer

Abstract

The utility model discloses a ribbon gear used for a printer, the ribbon gear comprises a gear main body and a shaft body, the gear main body is inserted on the shaft body, and the gear main body is made of a metal material; the gear main body is made of the metal material, the metal material does not have the problems of deformation and shrinkage rate in the injection molding process, and after the gear main body is subjected to injection molding, the gear is stable in size and good in meshing performance, so that a product is better and smoother to rotate in the printing process, abrasion is not prone to occurring, or a nylon tape base on a ribbon printer is not prone to being damaged; the printing problem caused by different sizes of gears is solved.

Description

Technical Field

[0001] The utility model relates to a ribbon gear, in particular to a ribbon gear for a printer, and is applied to the technical field of accessories of printers. Background Art

[0002] Printer gears are one of the core components of a printer, and they mainly drive the normal operation of the printer. When the printer receives a print command, the central processor converts the command into a mechanical motion signal, and automatically adjusts various components on the printer (such as the print head, ink cartridge, paper feeder, etc.) to the appropriate position through the rotation of the printer gears to achieve normal printing.

[0003] The gears used in existing ribbon printers or laser printers are all injection-molded one-piece plastic gears. Since plastic materials have a certain shrinkage rate, the gear sizes will fluctuate after injection molding. This causes the meshing force of the gears assembled in the product to fail to meet the use requirements, and it is easy to damage the nylon belt base on the ribbon printer, resulting in printing quality problems, which brings troubles to users and reduces the user experience. Summary of the invention

[0004] The ribbon gears used in the printers in the above-mentioned prior art are all injection-molded one-piece plastic gears. Since plastic materials have a certain shrinkage rate, the gear sizes of these gears will fluctuate and vary in size after injection molding, resulting in the meshing force of the gears assembled in the product failing to meet the use requirements, which can easily lead to printing quality problems and cause troubles for users. The utility model provides a ribbon gear for a printer, which makes the gear body of the gear be made of metal material, so that the metal material will not be deformed or have shrinkage problems during the injection molding process. After the gear body is injection molded, the gear size is stable and the meshing performance is good, so that the product can rotate better and more smoothly during the printing process, and is not prone to wear or damage to the nylon belt base on the ribbon printer, thereby solving the printing problem caused by different gear sizes.

[0005] The utility model solves the technical problem by adopting a technical solution: a ribbon gear for a printer, the ribbon gear comprises a gear body and a shaft body, the gear body is inserted on the shaft body, and the gear body is made of metal.

[0006] Furthermore, the gear body is made of steel, and the shaft is made of plastic.

[0007] Furthermore, the gear body is detachably connected to the shaft body.

[0008] Further, the gear body includes a first through hole, which passes through the top end and the bottom end of the gear body, a positioning groove is provided on the side wall of the first through hole, and a convex strip is provided on the outer side wall of the shaft body, and the convex strip can be inserted into the positioning groove; or a positioning groove is provided on the outer side wall of the shaft body, and a convex strip is provided on the side wall of the first through hole, and the convex strip can be inserted into the positioning groove.

[0009] Furthermore, a limiting groove is provided on the side wall at the inner end of the first through hole, and a protrusion is provided on the outer wall of the shaft body corresponding to the limiting groove. When the gear body is installed on the shaft body, the protrusion engages with the limiting groove.

[0010] Furthermore, the gear body includes a first gear and a second gear, the first gear and the second gear are vertically arranged in parallel, and the first gear and the second gear are both inserted on the shaft body.

[0011] Furthermore, the first gear and the second gear may both be spur gears or helical gears.

[0012] Further, a connecting piece is provided between the first gear and the second gear, the first gear and the second gear are connected by the connecting piece, and the first gear and the second gear form a certain distance, and the first gear, the second gear and the connecting piece are integrally formed.

[0013] Furthermore, a second through hole is provided on the shaft body, and the second through hole passes through the top end of the shaft body and the bottom end of the shaft body. A reinforcement is provided at the top end of the second through hole, and the reinforcement is arranged in a fan blade shape. The outer end of the reinforcement is fixedly connected to the side wall of the shaft body, and the center of the reinforcement is provided with an insertion hole for connecting to the drive shaft of the printer.

[0014] Furthermore, a plurality of brackets are provided at the inner bottom end of the second through hole, one end of the bracket is fixedly connected to the shaft, the other end of the bracket forms an angle with the side wall of the second through hole, the angle between the inner side surface of the bracket and the side wall of the second through hole is an acute angle of 15-45°, the plurality of brackets are arranged clockwise or counterclockwise, the plurality of brackets are used to be clamped with the ribbon box, and the gear body is arranged at one end where the bracket is provided.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a ribbon gear for a printer, which is made of a metal material so that the metal material does not have deformation and shrinkage problems during the injection molding process. After the gear body is injection molded, the gear size is stable and the meshing performance is good, so that the product can rotate better and smoothly during the printing process, and is not prone to wear or damage to the nylon belt base on the ribbon printer, thereby solving the printing problem caused by different gear sizes. The shaft is made of plastic material to facilitate tight assembly with the metal gear body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the ribbon gear provided by the utility model;

[0017] Figure 2 It is an exploded view of the ribbon gear provided by the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the gear body provided by the utility model;

[0019] Figure 4 It is a three-dimensional diagram of the shaft body provided by the utility model;

[0020] Figure 5 The utility model provides Figure 4 Another perspective of the picture.

[0021] Figure numerals: gear body-1; first through hole-11; positioning groove-111; limiting groove-112; first gear-12; second gear-13; connecting member-14; shaft-2; convex strip-21; protrusion-22; second through hole-23; reinforcement member-24; insertion hole-241; bracket-25; angle-251. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] See also Figure 1-5The utility model provides a ribbon gear for a printer, the ribbon gear comprising a gear body 1 and a shaft body 2, the gear body 1 is inserted on the shaft body 2, the gear body 1 is made of metal, that is, by making the gear body of metal, there is no deformation and shrinkage problem of the metal material during the injection molding process, and after the gear body is injection molded, the gear size is stable and the meshing performance is good, so that the product can rotate better and more smoothly during the printing process, and it is not easy to wear or damage the nylon belt base on the ribbon printer, solving the printing problem caused by different gear sizes; the metal material of the gear body in this embodiment can be gold, silver, copper or iron, preferably a rigid metal, because of its high hardness and low cost, the meshing between gears is better, the rotation is smoother, and it is not easy to wear; the gear in this embodiment can be helical teeth or straight teeth, which is not limited here.

[0024] In this embodiment, the gear body 1 is made of steel and the shaft 2 is made of plastic, so that the shaft 2 can be better and tightly connected with the metal gear body 1. If the shaft is also made of metal, it is not easy to assemble the two metal materials, and it is necessary to design how to assemble them so that they can be disassembled but not easily worn, which is more troublesome. If the shaft 2 is made of plastic, plastic and metal can have an interference fit, so the connection is tight, and too much design is used between the two to ensure the stability between the two. In addition, plastic is lighter than metal and is easy to drive. Plastic is also easy to cut, grind and adjust, so it is easy to assemble with the metal gear body.

[0025] In this embodiment, the gear body 1 and the shaft body 2 are detachably connected, which is convenient for disassembly and assembly. If any parts are damaged, it is convenient to replace the parts.

[0026] In this embodiment, the gear body includes a first through hole 11, which passes through the top end and the bottom end of the gear body 1. A positioning groove 111 is provided on the side wall of the first through hole 11, and a convex strip 21 is provided on the outer wall of the shaft body 2, and the convex strip 21 can be inserted into the positioning groove 111; or a positioning groove 111 is provided on the outer wall of the shaft body 2, and a convex strip 21 is provided on the side wall of the first through hole 11, and the convex strip 21 can be inserted into the positioning groove 111. This structure facilitates disassembly and assembly between the gear body 1 and the shaft body 2.

[0027] In this embodiment, a limiting groove 112 is provided on the side wall of the inner end of the first through hole 11, and a protrusion 22 is provided on the outer wall of the shaft body 2 corresponding to the limiting groove 112. When the gear body 1 is installed on the shaft body 2, the protrusion 22 engages with the limiting groove 112. This structure is easier to assemble. When the gear body is installed on the shaft body, it is necessary to align the position. It cannot be installed too far or not aligned with the installation position. The protrusion 22 achieves a limiting effect. When the gear body is inserted into the shaft body, the protrusion 22 limits the forward movement of the shaft body, which is equivalent to aligning with the installation position, which is more convenient for users to install.

[0028] In this embodiment, the gear body 1 includes a first gear 12 and a second gear 13. The first gear 12 and the second gear 13 are arranged vertically and side by side, and the first gear 12 and the second gear 13 are both inserted on the shaft body 2. The two gear bodies can be meshed with gear bodies of different diameters, or one gear body can be selected to mesh with another gear, which is convenient for use according to the user's choice.

[0029] In this embodiment, the first gear 12 and the second gear 13 may both be straight teeth or helical teeth.

[0030] In this embodiment, a connecting member 14 is provided between the first gear 12 and the second gear 13, and the first gear 12 and the second gear 13 are connected by the connecting member 14, and the first gear 12 and the second gear 13 form a certain distance, and the first gear 12, the second gear 13 and the connecting member 14 are integrally formed. If the first gear 12 and the second gear 13 are not connected, the two are close to each other, which is not convenient for a single gear body to drive the ribbon, and they will affect each other, resulting in poor printing effect. Therefore, it is recommended to set a connecting member to form a certain distance between the first gear 12 and the second gear 13.

[0031] In this embodiment, a second through hole 23 is provided on the shaft body 2, and the second through hole 23 passes through the top end and the bottom end of the shaft body 2. A reinforcing member 24 is provided at the top end of the second through hole 23, so that the shaft body 2 is harder and more stable. If the reinforcing member 24 is not provided, the shaft body 2 is hollow and made of plastic, and the shaft body 2 is easy to deform when assembled with the gear shaft body. If the shaft body is made solid, it is heavy and inconvenient to use. The reinforcing member 24 is arranged in a fan blade shape, which has higher hardness, stronger support, and is not easy to deform. The outer end of the reinforcing member 24 is fixedly connected to the side wall of the shaft body 2, and the reinforcing member 24 is integrally formed with the shaft body. The center of the reinforcing member 24 is provided with an insertion hole 241 for connecting the rotating shaft of the ribbon box, which is convenient for connecting with the drive.

[0032] In this embodiment, a plurality of brackets 25 are provided at the inner bottom end of the second through hole 23, one end of the bracket 25 is fixedly connected to the shaft body 2, and the other end of the bracket 25 forms an angle 251 with the side wall of the second through hole 23, and the angle 251 between the inner side surface of the bracket 25 and the side wall of the second through hole 23 is an acute angle of 15-45°, and the preferred angle 251 is 30°, which is convenient for disassembly and assembly of the ribbon cassette and more stable during installation. When rotated and engaged, there is also a rebound space, which is not convenient for damage to the ribbon cassette and the shaft body. The plurality of brackets 25 are arranged clockwise or counterclockwise, and the plurality of brackets 25 are used to engage with the ribbon cassette, and the gear body 1 is arranged at one end where the bracket 25 is provided. This structure is convenient for disassembly and assembly of the ribbon cassette and for connection between the ribbon cassette and the ribbon gear.

[0033] To summarize, the material of the gear body is metal, and the gear body tooth part is formed by metal material. There is a through hole and a positioning groove in the middle of the gear body, and the shaft is made of plastic material, which is connected to the driving or positioning part of the printer. The shaft has ribs for positioning with the metal gear, and the injection-molded shaft structure is embedded in the metal gear for positioning and matching. In this way, an embedded composite gear is composed of two different materials. This embedded composite gear can be suitable for straight teeth or helical teeth. This gear has stable size and good meshing performance, which makes the product rotate better and smoother during the printing process, and is not easy to wear or damage the nylon belt base on the ribbon product, solving the printing problem caused by different gear sizes.

[0034] The specific implementation process of the ribbon gear in this implementation is as follows:

[0035] The machined gear body is placed into a special tooling for positioning and fixing, and then the injection molded shaft is placed into the middle hole of the gear and aligned with the corresponding positioning groove. The rubber shaft is pressed down into the gear and fixed by a press machine, thus forming an embedded composite gear.

[0036] The manufacturing method of the ribbon gear in this embodiment is as follows:

[0037] The metal gears are formed by machining methods such as lathes, CNC lathes, tangent cutting or CNC machines, and the rubber shafts are formed by developing injection molds and injection molding on injection molding machines. After the two parts are processed, the metal gears are positioned through positioning tooling, and then the injection-molded rubber shaft is placed into the middle hole of the gear and aligned with the corresponding positioning groove. The shaft is pressed down into the gear body by a press machine to fix it, thus forming an embedded composite gear.

[0038] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A ribbon gear for a printer, characterized in that: The ribbon gear comprises a gear body (1) and a shaft body (2); the gear body (1) is inserted into the shaft body (2); and the gear body (1) is made of metal.

2. A ribbon gear for a printer according to claim 1, characterized in that: The gear body (1) is made of steel, and the shaft (2) is made of plastic.

3. A ribbon gear for a printer according to claim 1, characterized in that: The gear body (1) and the shaft body (2) are detachably connected.

4. A ribbon gear for a printer according to claim 3, characterized in that: The gear body comprises a first through hole (11), the first through hole (11) passes through the top end and the bottom end of the gear body (1), a positioning groove (111) is provided on the side wall of the first through hole (11), a convex strip (21) is provided on the outer side wall of the shaft body (2), and the convex strip (21) can be inserted into the positioning groove (111); or a positioning groove (111) is provided on the outer side wall of the shaft body (2), a convex strip (21) is provided on the side wall of the first through hole (11), and the convex strip (21) can be inserted into the positioning groove (111).

5. A ribbon gear for a printer according to claim 4, characterized in that: A limiting groove (112) is provided on the side wall at one end located on the inner side of the first through hole (11), and a protrusion (22) is provided on the outer wall of the shaft body (2) corresponding to the limiting groove (112); when the gear body (1) is mounted on the shaft body (2), the protrusion (22) engages with the limiting groove (112).

6. A ribbon gear for a printer according to claim 1, characterized in that: The gear body (1) comprises a first gear (12) and a second gear (13); the first gear (12) and the second gear (13) are arranged vertically and in parallel, and the first gear (12) and the second gear (13) are both inserted into the shaft body (2).

7. A ribbon gear for a printer according to claim 6, characterized in that: The first gear (12) and the second gear (13) can both have straight teeth or helical teeth.

8. The ribbon gear for a printer according to claim 6, characterized in that: A connecting piece (14) is provided between the first gear (12) and the second gear (13); the first gear (12) and the second gear (13) are connected via the connecting piece (14); a certain distance is formed between the first gear (12) and the second gear (13); the first gear (12), the second gear (13) and the connecting piece (14) are integrally formed.

9. The ribbon gear for a printer according to claim 1, characterized in that: The shaft body (2) is provided with a second through hole (23), the second through hole (23) passes through the top end of the shaft body (2) and the bottom end of the shaft body (2), a reinforcing member (24) is provided at the top end of the second through hole (23), the reinforcing member (24) is arranged in a fan blade shape, the outer end of the reinforcing member (24) is fixedly connected to the side wall of the shaft body (2), and the center of the reinforcing member (24) is provided with an insertion hole (241) for connecting with the driving shaft of the printer.

10. The ribbon gear for a printer according to claim 9, characterized in that: A plurality of brackets (25) are provided at the inner bottom end of the second through hole (23); one end of the bracket (25) is fixedly connected to the shaft body (2); the other end of the bracket (25) forms an angle (251) with the side wall of the second through hole (23); the angle (251) between the inner side surface of the bracket (25) and the side wall of the second through hole (23) is an acute angle of 15-45°; the plurality of brackets (25) are arranged clockwise or counterclockwise; the plurality of brackets (25) are used for clamping with the ribbon box; the gear body (1) is arranged at one end where the bracket (25) is provided.

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