A print roller structure for a needle printer

Abstract

This invention provides a printing roller structure for a dot matrix printer, relating to the field of printer components, including a docking end shaft; the docking end shaft has two locations, with two separate inner shafts movably connected between the two docking end shafts; positioning locking rings, also having two locations, are slidably connected to the two separate inner shafts respectively; a separate inner support cylinder, movably connected to the two separate inner shafts; and a buffer double-layer sleeve, tightly fitted onto the separate inner support cylinder. The printing roller is easy and quick to disassemble, facilitating regular cleaning and maintenance of the printer, and effectively improving the cleaning and maintenance efficiency of the dot matrix printer. When reinstalling the printing roller after cleaning, the docking end shaft and the separate inner shafts are docked in the same way, solving the problem of damage to the printer caused by improper disassembly during cleaning and maintenance of traditional dot matrix printers, resulting in unnecessary losses.

Description

Technical Field

[0001] This invention relates to the field of printer component technology, and in particular to a printing roller structure for a dot matrix printer. Background Technology

[0002] Dot matrix printers rely on the impact of print needles from the print head against the printing platform, causing the ink ribbon between the print head and the platform to leave printed content on the paper. The main function of the print roller in a dot matrix printer is to provide the necessary motion for printing, while also carrying the print needles and transmitting printing information. It works in conjunction with the paper feed mechanism to transport and position the paper, thus completing the printing process. During printing, the impact between the print head and the print roller generates noise and vibration, which can easily damage the print head and roller. A dirty print roller will affect print quality and the normal operation of the printer, causing paper to fail to feed properly, resulting in paper not feeding. This can affect the continuity and integrity of the print, leading to unclear text or images or streaks. Furthermore, a dirty print roller can cause wear or blockage of the print needles, further affecting print quality. Therefore, regularly cleaning and maintaining the print roller of a dot matrix printer is crucial to ensure the printer's normal operation and good print results.

[0003] The existing dot matrix printers have a compact installation structure for cleaning and maintenance. The roller body support is fixed by at least four screws. When disassembling the roller, the screws need to be removed, and then the support is disassembled together. The disassembly process is cumbersome. Moreover, due to the delicate internal structure of the dot matrix printer, improper disassembly can easily damage the printer and cause unnecessary losses. Summary of the Invention

[0004] In view of this, the present invention provides a printing roller structure for a dot matrix printer to solve the problem that the existing dot matrix printers have a compact installation structure for cleaning and maintenance. The printing roller body support is fixedly connected by at least four screws. When disassembling the printing roller, the screws need to be removed and then the support is disassembled together. The disassembly process is cumbersome. Furthermore, due to the delicate internal structure of the dot matrix printer, improper disassembly can easily damage the printer and cause unnecessary losses.

[0005] This invention provides a printing roller structure for a dot matrix printer, specifically comprising: a docking end shaft; two docking end shafts are provided, and two separate inner shafts are movably connected between the two docking end shafts; two positioning locking rings are provided, and the two positioning locking rings are slidably connected to the two separate inner shafts respectively; a separate inner support cylinder, and the separate inner support cylinder is movably connected to the two separate inner shafts; a buffer double-layer sleeve, and the buffer double-layer sleeve is tightly fitted onto the separate inner support cylinder; a buffer ring frame, and two buffer ring frames are provided, and the two buffer ring frames are tightly connected to the two ends of the inner cavity of the buffer double-layer sleeve respectively; a noise reduction filling layer, and the noise reduction filling layer fills the inner cavity of the buffer double-layer sleeve; a roller body rubber outer layer, and the roller body rubber outer layer is fitted onto the buffer double-layer sleeve, with the edge of the roller body rubber outer layer bent inward, and the bent area at the end of the roller body rubber outer layer fitting against the inner surface of the positioning locking ring.

[0006] Furthermore, the outer end of the mating shaft is connected to a drive gear via an interference fit, the inner end of the mating shaft is fixedly connected to a drive plug, and the inner end of the drive plug is connected to a mating post via welding.

[0007] Furthermore, the inner end of the docking pin is provided with a docking plug with a frustum-shaped structure, and four transmission protrusions with a semi-circular cross-section are provided on the outer surfaces of both the docking pin and the docking plug.

[0008] Furthermore, the split inner shaft has two sections, which are respectively connected to two mating end shafts. The outer end of the split inner shaft is provided with an inner shaft end plate, and the outer surface of the inner shaft end plate is provided with an end plate insertion port.

[0009] Furthermore, a transmission slot is provided on the inner wall of the end plate socket, and the inner end of the split inner shaft is connected to a limit end by a screw. Two strip-shaped inner shaft protrusions are machined on the outer surface of the split inner shaft.

[0010] Furthermore, the positioning lock ring has a circular ring structure, with two lock ring inner openings on the inner ring surface. A lock ring top spring is fixedly connected to the outer surface of the positioning lock ring, and the outer end of the lock ring top spring is fixedly connected to the inner surface of the inner shaft end plate.

[0011] Furthermore, the split-type inner support tube is formed by splicing two cylindrical sections. Two inner tube recesses are provided on the inner wall of the split-type inner support tube. The inner tube recesses are parallel to the axis of the split-type inner support tube. An inner tube limiting cavity is provided at the inner end of the split-type inner support tube. The inner diameter of the inner tube limiting cavity is equal to the diameter of the limiting end. The right end of the left split-type inner support tube is provided with a first mating thread, and the left end of the right split-type inner support tube is provided with a second mating thread. The first mating thread and the second mating thread form a spiral connection.

[0012] Furthermore, the buffer double-layer sleeve is composed of an inner sleeve and an outer sleeve. The inner sleeve is located inside the outer sleeve, and there is a gap between the outer surface of the inner sleeve and the inner surface of the outer sleeve. The inner sleeve and the outer sleeve are coaxial, and the inner sleeve and the outer sleeve are connected by eight positioning springs.

[0013] Furthermore, the buffer ring frame includes two annular silicone support rings assembled with four support ring connecting rods. The two silicone support rings are supported and connected by the four support ring connecting rods. The two silicone support rings are parallel and coaxial. The outer surface of the silicone support rings is tightly attached to the inner wall of the outer sleeve, and the inner surface of the silicone support rings is tightly attached to the outer wall of the inner sleeve.

[0014] Furthermore, the noise-reducing filling layer is formed by filling with sound-insulating cotton, and the noise-reducing filling layer is located in the gap between the inner sleeve and the outer sleeve.

[0015] This invention provides a printing roller structure for a dot matrix printer, which has the following beneficial effects:

[0016] 1. The printing roller connection structure in the dot matrix printer of this invention has been improved. When performing regular cleaning and maintenance of the dot matrix printer, after opening the printer casing, there is no need to disassemble the support of the printing roller inside the printer, nor is it necessary to remove the support screws. The docking structure can be manually pushed or a tool can be used to push the docking structure to loosen it from the printing roller, thus completing the quick disassembly of the printing roller. The printing roller is easy and quick to disassemble, which facilitates the regular cleaning and maintenance of the printer and effectively improves the cleaning and maintenance efficiency of the dot matrix printer. When reinstalling the printing roller after cleaning, the docking end shaft can be docked with the split inner shaft in the same way. This solves the problem that improper disassembly during the cleaning and maintenance of traditional dot matrix printers can easily damage the printer and cause unnecessary losses.

[0017] 2. The printer in this invention has a built-in buffer mechanism in its printing roller. During use, when the print head collides with the printing roller, the double-layered buffer sleeve can deform, causing slight movement of the outer sleeve, thereby reducing the vibration of the printing roller, reducing the vibration generated when the printing roller is impacted by the print head, slowing down the fatigue damage of the print head, and effectively protecting the printing roller and the dot matrix printer. Inside the double-layered buffer sleeve, there is a noise-reducing filling layer. This layer can absorb the noise generated when the print head collides with the printing roller, reducing the noise generated during printing. While ensuring the original transmission efficiency and support stability, it further reduces the noise and vibration during printer operation. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0019] Figure 2This is a schematic diagram of the internal structure of an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure in an exploded state according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the buffer double-layer sleeve 5 according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the buffer ring frame 6 in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the split-type inner support cylinder 4 in its disassembled state, according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the split inner shaft 2 according to an embodiment of the present invention;

[0025] Figure 8 This is an embodiment of the present invention. Figure 2 A magnified structural diagram of point A;

[0026] Figure 9 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of point B;

[0027] Figure 10 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of point C.

[0028] List of reference numerals

[0029] 1. Docking end shaft; 101. Drive gear; 102. Drive plug; 103. Docking post; 104. Docking plug; 105. Transmission protrusion; 2. Split inner shaft; 201. Inner shaft end plate; 202. End plate socket; 203. Transmission slot; 204. Limiting end; 205. Inner shaft protrusion; 3. Positioning locking ring; 301. Locking ring inner opening; 302. Locking ring top spring; 4. Split inner support cylinder; 401. Inner cylinder concave strip; 402. Inner cylinder limiting cavity; 403. First docking thread; 404. Second docking thread; 5. Buffer double-layer sleeve; 501. Inner sleeve; 502. Outer sleeve; 503. Positioning support spring; 6. Buffer ring frame; 601. Silicone support ring; 602. Support ring connecting rod; 7. Noise reduction filling layer; 8. Roller body rubber outer layer. Detailed Implementation

[0030] To make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention.

[0031] Please refer to Figures 1 to 10 As shown:

[0032] Example 1: This invention provides a printing roller structure for a dot matrix printer, including a docking end shaft 1; two docking end shafts 1 are provided, and two separate inner shafts 2 are movably connected between the two docking end shafts 1; two positioning locking rings 3 are provided, and the two positioning locking rings 3 are respectively slidably connected to the two separate inner shafts 2; a separate inner support cylinder 4 is movably connected to the two separate inner shafts 2; and a buffer double-layer sleeve 5 is tightly fitted onto the... The split inner support cylinder 4 includes: a buffer ring frame 6, which has two locations, each tightly connected to both ends of the inner layer of the buffer double-layer sleeve 5; a noise reduction filling layer 7, which fills the inner layer of the buffer double-layer sleeve 5; and a roller body rubber outer layer 8, which is fitted onto the buffer double-layer sleeve 5, with the edges of the roller body rubber outer layer 8 bent inwards, and the bent area at the end of the roller body rubber outer layer 8 fitting against the inner surface of the positioning locking ring 3.

[0033] The outer end of the docking shaft 1 is connected to the drive gear 101 via an interference fit, and the inner end of the docking shaft 1 is fixedly connected to the drive plug 102. The inner end of the drive plug 102 is connected to the docking post 103 via welding. The inner end of the docking post 103 is provided with a frustum-shaped docking plug 104. Four transmission protrusions 105 with a semi-circular cross-section are provided on the outer surfaces of both the docking post 103 and the docking plug 104. In the normal working state of the dot matrix printer, the docking shaft 1 is installed inside the dot matrix printer via bearings and brackets, allowing the docking shaft 1 to rotate freely. It is connected to the drive gear 101 through the built-in drive mechanism of the dot matrix printer, thereby driving the docking shaft 1 to rotate.

[0034] The split inner shaft 2 consists of two sections, which are respectively connected to the two docking end shafts 1. The outer end of the split inner shaft 2 is provided with an inner shaft end plate 201, and the outer surface of the inner shaft end plate 201 is provided with an end plate socket 202 in the middle. The inner wall of the end plate socket 202 is provided with a transmission slot 203. When the printing roller is installed in the dot matrix printer, the end plate socket 202 is inserted into the docking post 103, and the transmission protrusion 105 is connected to the transmission slot 203 on the inner wall of the end plate socket 202, which plays the role of transmitting torque. The split inner shaft 2 can be driven to rotate by the rotation of the docking end shaft 1, thereby driving the printing roller to rotate. The frustum-shaped docking plug 104 facilitates the precise insertion of the docking post 103 into the end plate socket 202 when the printing roller is reinstalled on the dot matrix printer.

[0035] The inner end of the split inner shaft 2 is connected to a limiting end 204 by screws. Two strip-shaped inner shaft protrusions 205 are machined on the outer surface of the split inner shaft 2. The inner shaft protrusions 205 are movably connected to the inner cylinder concave strip 401 to transmit torque and drive the split inner support cylinder 4 to rotate. The inner end of the split inner support cylinder 4 has an inner cylinder limiting cavity 402. The inner diameter of the inner cylinder limiting cavity 402 is equal to the diameter of the limiting end 204. Through the function of the limiting end 204, the range of motion of the split inner shaft 2 is limited, so that the limiting end 204 is always located inside the inner cylinder limiting cavity 402, preventing the split inner shaft 2 from moving outward too much and detaching from the split inner support cylinder 4.

[0036] The positioning locking ring 3 has a circular ring structure. Two locking ring inner openings 301 are opened on the inner ring surface of the positioning locking ring 3. A locking ring top spring 302 is fixedly connected to the outer surface of the positioning locking ring 3. The outer end of the locking ring top spring 302 is fixedly connected to the inner surface of the inner shaft end plate 201. The locking ring inner opening 301 is slidably connected to the inner shaft protrusion 205 to transmit torque. Under normal conditions, the locking ring top spring 302 pushes the positioning locking ring 3 towards the inner end of the split inner shaft 2. The locking ring top spring 302 applies a pushing force to the positioning locking ring 3, so that the positioning locking ring 3, under the action of the top spring, cooperates with the end face of the buffer double-layer sleeve 5 to clamp the outer rubber layer 8 of the roller body. Then, the outer rubber layer 8 of the roller body and the buffer double-layer sleeve 5 rotate with the split inner shaft 2 under the action of friction. Through the action of the rubber outer rubber layer 8 of the roller body, the impact force generated by the printing needle hitting the printing roller is further reduced, thereby reducing the noise when the printing roller is working.

[0037] The split inner support cylinder 4 is formed by splicing two cylindrical sections. Two inner cylinder recesses 401 are provided on the inner wall of the split inner support cylinder 4. The inner cylinder recesses 401 are parallel to the axis of the split inner support cylinder 4. The right end of the left split inner support cylinder 4 is provided with a first mating thread 403, and the left end of the right split inner support cylinder 4 is provided with a second mating thread 404. The first mating thread 403 and the second mating thread 404 form a spiral connection. The split inner support cylinder 4 is easy to assemble and facilitates the disassembly of the printing roller, making it convenient for the maintenance, disassembly and cleaning of the printing roller.

[0038] The buffer double-layer sleeve 5 consists of an inner sleeve 501 and an outer sleeve 502. The inner sleeve 501 is located inside the outer sleeve 502, and there is a gap between the outer surface of the inner sleeve 501 and the inner surface of the outer sleeve 502. The inner sleeve 501 and the outer sleeve 502 are coaxial and connected by eight positioning springs 503. Both the inner sleeve 501 and the outer sleeve 502 are made of rigid materials. The buffer double-layer sleeve 5 provides support for the outer rubber layer 8 of the roller body, so that the inside of the printing roller has stable support. The positioning springs 503 in the gap between the inner sleeve 501 and the outer sleeve 502 provide support, which plays a role in buffering and shock absorption, reducing the impact force on the printing roller body during the operation of the printer.

[0039] The buffer ring frame 6 is formed by assembling two annular silicone support rings 601 and four support ring connecting rods 602. The two silicone support rings 601 are supported and connected by the four support ring connecting rods 602. The two silicone support rings 601 are parallel and coaxial. The outer surface of the silicone support ring 601 is tightly attached to the inner wall of the outer sleeve 502, and the inner surface of the silicone support ring 601 is tightly attached to the outer wall of the inner sleeve 501. The buffer ring frame 6 further improves the support stability between the inner sleeve 501 and the outer sleeve 502. Moreover, the buffer ring frame 6 composed of the silicone support rings 601 and the support ring connecting rods 602 is easy to install and can be directly pushed into the gap between the inner sleeve 501 and the outer sleeve 502.

[0040] Example 2: This invention provides a printing roller structure for a dot matrix printer. The noise-reducing filling layer 7 is formed by filling with sound-insulating cotton and is located in the gap between the inner sleeve 501 and the outer sleeve 502. The noise-reducing filling layer 7 is provided inside the double-layer buffer double sleeve 5. The noise-reducing filling layer 7 can absorb the noise generated when the print head and the printing roller collide, reducing the noise generated during the printing process. While ensuring the original transmission efficiency and support stability, it further reduces the noise and vibration during the operation of the printer, reduces the path of noise transmitted from the outer sleeve 502 to the inner sleeve 501 after being impacted, and reduces the leakage of noise.

[0041] Specific usage and function: In this invention, firstly, during the regular maintenance and cleaning of the dot matrix printer, the printer casing is removed. Then, manually or with tools, the two inner shaft end plates 201 at both ends of the printing roller are pushed towards the center of the printing roller. The inner shaft end plates 201 compress the locking ring top spring 302. When the split inner shaft 2 retracts, it increases the gap between the inner shaft end plate 201 and the drive plug 102, causing the transmission slot 203 to separate from the docking pin 103, thereby disengaging the split inner shaft 2 from the docking end shaft 1. The printing roller can then be lifted upwards and removed. After removing the printing roller, its outer surface is cleaned. After cleaning, the two inner shaft end plates 201 are pushed inwards again, making the distance between the two inner shaft end plates 201 smaller than the distance between the two docking plugs 104, so that the docking pin 103 and the end plate socket 201 are connected. 2. Reconnect the inner shaft end plate 201 outward under the action of the locking ring top spring 302, so that the docking post 103 is inserted into the end plate socket 202, thus completing the quick installation of the printing roller. When the printing roller is impacted by the print head during printing, the noise reduction filling layer 7 between the inner sleeve 501 and the outer sleeve 502 shrinks and absorbs the vibration generated by the outer sleeve 502 through the noise reduction filling layer 7, preventing the vibration from being transmitted to the inner sleeve 501 and reducing the noise overflow during printing. The buffer double sleeve 5 acts as a support for the rubber outer layer 8 of the roller body, so that the inside of the printing roller has a stable support. The positioning support spring 503 provides support in the gap between the inner sleeve 501 and the outer sleeve 502, which plays a role in buffering and shock absorption, reducing the probability of the printing roller body being damaged by impact during the operation of the printer.

Claims

1. A printing roller structure for a dot matrix printer, characterized in that, Includes a docking end shaft (1); the docking end shaft (1) has two locations, and two separate inner shafts (2) are movably connected between the two docking end shafts (1); a positioning locking ring (3), the positioning locking ring (3) has two locations, and the two positioning locking rings (3) are slidably connected to the two separate inner shafts (2); a separate inner support cylinder (4), the separate inner support cylinder (4) is movably connected to the two separate inner shafts (2); a buffer double-layer sleeve (5), the buffer double-layer sleeve (5) is tightly fitted onto the separate inner support cylinder (4); and a buffer... The buffer ring frame (6) has two locations, and the two buffer ring frames (6) are tightly connected to the two ends of the inner layer of the buffer double-layer sleeve (5); the noise reduction filling layer (7) is filled in the inner layer of the buffer double-layer sleeve (5); the roller body rubber outer layer (8) is sleeved on the buffer double-layer sleeve (5), and the edge of the roller body rubber outer layer (8) is bent inward, and the end bending area of ​​the roller body rubber outer layer (8) is in contact with the inner surface of the positioning lock ring (3); The split inner shaft (2) has two sections. The two sections of the split inner shaft (2) are respectively connected to the two docking end shafts (1). The outer end of the split inner shaft (2) is provided with an inner shaft end plate (201). An end plate insertion port (202) is opened in the middle of the outer surface of the inner shaft end plate (201). The inner wall of the end plate socket (202) is provided with a transmission slot (203), and the inner end of the split inner shaft (2) is connected to a limit end (204) by screws. Two strip-shaped inner shaft protrusions (205) are machined on the outer surface of the split inner shaft (2). The positioning lock ring (3) has a circular ring structure. Two lock ring inner openings (301) are opened on the inner ring surface of the positioning lock ring (3). A lock ring top spring (302) is fixedly connected to the outer surface of the positioning lock ring (3). The outer end of the lock ring top spring (302) is fixedly connected to the inner surface of the inner shaft end plate (201).

2. The printing roller structure of a dot matrix printer as described in claim 1, characterized in that: The outer end of the docking shaft (1) is connected to a drive gear (101) by an interference fit, the inner end of the docking shaft (1) is fixedly connected to a drive plug (102), and the inner end of the drive plug (102) is connected to a docking post (103) by welding.

3. The printing roller structure of a dot matrix printer as described in claim 2, characterized in that: The inner end of the docking pin (103) is provided with a frustum-shaped docking plug (104), and four transmission protrusions (105) with semi-circular cross sections are provided on the outer surfaces of both the docking pin (103) and the docking plug (104).

4. The printing roller structure of a dot matrix printer as described in claim 1, characterized in that: The split inner support cylinder (4) is formed by splicing two cylindrical sections. Two inner cylinder recesses (401) are provided on the inner wall of the split inner support cylinder (4). The inner cylinder recesses (401) are parallel to the axis of the split inner support cylinder (4). An inner cylinder limiting cavity (402) is provided at the inner end of the split inner support cylinder (4). The inner diameter of the inner cylinder limiting cavity (402) is equal to the diameter of the limiting end (204). The right end of the left split inner support cylinder (4) is provided with a first mating thread (403), and the left end of the right split inner support cylinder (4) is provided with a second mating thread (404). The first mating thread (403) and the second mating thread (404) form a spiral connection.

5. The printing roller structure of a dot matrix printer as described in claim 1, characterized in that: The buffer double-layer sleeve (5) consists of two parts: an inner sleeve (501) and an outer sleeve (502). The inner sleeve (501) is located inside the outer sleeve (502), and there is a gap between the outer surface of the inner sleeve (501) and the inner surface of the outer sleeve (502). The inner sleeve (501) and the outer sleeve (502) are coaxial, and the inner sleeve (501) and the outer sleeve (502) are connected by eight positioning springs (503).

6. The printing roller structure of a dot matrix printer as described in claim 5, characterized in that: The buffer ring frame (6) is formed by assembling two annular silicone support rings (601) and four support ring connecting rods (602). The two silicone support rings (601) are supported and connected by the four support ring connecting rods (602). The two silicone support rings (601) are parallel and coaxial. The outer surface of the silicone support ring (601) is tightly attached to the inner wall of the outer sleeve (502), and the inner surface of the silicone support ring (601) is tightly attached to the outer wall of the inner sleeve (501).

7. The printing roller structure of a dot matrix printer as described in claim 5, characterized in that: The noise reduction filling layer (7) is formed by filling with sound insulation cotton and is located in the gap between the inner sleeve (501) and the outer sleeve (502).

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