Developing device for laser printer
By setting a vibration mechanism and a protective unit in the developing device, the problem of toner condensation on the photosensitive drum in a humid environment is solved, and high-quality printing in humid conditions is achieved.
Patent Information
- Application Number
- CN202422428726.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-09
AI Technical Summary
When a laser printer is placed in a humid environment, the toner on the photosensitive drum condenses into lumps due to moisture, affecting the print quality and causing a decline in image quality.
A developing device including a vibration mechanism and a protection unit is designed. The vibration mechanism vibrates the photosensitive drum to remove condensed toner blocks, and the protection unit collects and discharges the condensed toner to prevent it from entering the transmission parts.
The reliability and stability of the developing device in humid environments are improved, preventing condensed toner from affecting printing quality and ensuring image quality.
Smart Images
Figure CN223362501U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of laser printers, and more specifically to a developing device for laser printers. Background Art
[0002] A laser printer is a device that uses laser technology to print. It uses a laser beam to form graphic information on a photosensitive drum, and then transfers this information to paper. The main components of a laser printer include a laser component, a paper feed component, a developing component, and a fixing component. The developing unit is the component in the laser printer used to display the printed content. It consists of a photosensitive drum and a toner cartridge. The working principle of the developing unit is that after forming an electrostatic latent image on the photosensitive drum, the toner is adsorbed onto the photosensitive drum through the developing system to form a visible image, and then the image is transferred to the paper through the transfer system.
[0003] Currently, when a laser printer is used in a humid environment, the photosensitive drum in the developing unit of the printer will be affected by the humid environment and may malfunction. The toner on the photosensitive drum in the developing unit will clump due to the moisture. During printing, the surface charge of the photosensitive drum changes due to the moisture. During the printing process, the clumps of toner on the photosensitive drum may not be printed on the paper, affecting the quality of the image printed on the paper next time. Therefore, a developing device for a laser printer is needed.
[0004] new content
[0005] The purpose of this invention is to provide a developing device for a laser printer to solve the technical problem that the surface charge of the photosensitive drum changes due to moisture, and the toner condensed into lumps on the photosensitive drum may not be printed on the paper, affecting the quality of the image printed on the paper next time.
[0006] To solve the above technical problems, the present invention provides the following technical solutions: A developing device for a laser printer, comprising a laser printer body with a laser scanning unit, a paper discharge port being provided at the top of the laser printer body, brackets being fixedly connected to inner walls on both sides of the laser printer body, a vibration mechanism being provided on opposite sides of the two brackets; the vibration mechanism comprising a transmission rod and a protection unit; a paper feeding unit being provided on opposite sides between the two brackets; the transmission rod being fixedly connected between the two brackets, a photosensitive drum being movably sleeved on the outer wall of the transmission rod, an annular groove being provided on opposite sides of the two brackets, and ends of the transmission rod and the photosensitive drum respectively extending to inner walls on one side of the annular groove, a plurality of limiting holes being provided at both ends of the photosensitive drum, and the limiting holes being distributed in an annular array, a limiting rod being movably sleeved on the inner wall of each limiting hole, a spring being movably sleeved on the outer wall of the limiting rod, and one end of the spring being fixedly connected to the inner wall on one side of the limiting hole, one end of the limiting rod being fixedly connected to a vibration plate, and a plurality of undulating blocks being fixedly connected to the inner wall of the photosensitive drum.
[0007] Preferably, the two ends of the photosensitive drum are respectively fixedly sleeved with gear rings. In this novel device, a vibration mechanism is provided. When the laser printer is used in a humid environment, the electric field on the surface of the photosensitive drum is affected, and toner that has condensed into agglomerates is adsorbed on the surface of the photosensitive drum. The spring makes the photosensitive drum rotate, and the vibration plate impacts the surface of the photosensitive drum through the undulating plate, thereby causing the photosensitive drum to vibrate and move from both ends to the middle, thereby vibrating and removing the agglomerated toner on its surface, which is beneficial to improving the reliability and stability of the device.
[0008] Preferably, the protection unit includes two protection frames, which are respectively fixedly connected to opposite sides of the bracket, and a baffle is commonly fixedly connected to the opposite sides of the two protection frames.
[0009] Preferably, limiting grooves are respectively provided on opposite sides of the two brackets, limiting rings are movably sleeved inside the two limiting grooves, the two brackets are movably sleeved with a developing roller, and the two limiting rings are respectively fixedly connected to the two ends of the developing roller.
[0010] Preferably, through holes are respectively opened on opposite sides of the two protective frames and the photosensitive drum passes through the two through holes, and a curved surface is provided on the top of the baffle.
[0011] Preferably, the two ends of the developing roller are respectively fixedly sleeved with a gear 1 and the gear ring is meshed with the gear 1. In this novel device, a protective unit is provided, and the toner in the ink cartridge condenses into agglomerates in a humid environment. The agitator in the ink cartridge allows the agglomerated toner to be discharged outward through the developing roller. At this time, the torque of the developing roller can throw the agglomerated toner outward onto the baffle, and the agglomerated toner can be collected completely through the curved surface, thereby preventing the agglomerated toner from entering the transmission parts, which is beneficial to improving the stability of the device.
[0012] Preferably, the paper feeding unit includes a charging roller, which is movably sleeved between the two brackets via a bearing and contacts the surface of the photosensitive drum.
[0013] Preferably, a paper feed roller is movably sleeved on one side of the two brackets via a bearing, and two ends of the paper feed roller are respectively fixedly sleeved with a second gear, and the second gear is meshed with the gear ring.
[0014] Compared with the prior art, the beneficial effects of this novel method are:
[0015] 1. This novel device is equipped with a vibration mechanism. When the laser printer is used in a humid environment, the electric field on the surface of the photosensitive drum is affected, and agglomerated toner may be adsorbed on the surface of the photosensitive drum. The spring causes the photosensitive drum to rotate, causing the vibration plate to impact the surface of the photosensitive drum through the undulating plate, thereby causing the photosensitive drum to vibrate and move from both ends to the center, removing the agglomerated toner on its surface. This helps to improve the reliability and stability of the device.
[0016] 2. This new device is equipped with a protective unit. The toner in the ink cartridge condenses into agglomerates in a humid environment. The agitator in the ink cartridge allows the agglomerated toner to be discharged outward through the developing roller. At this time, the torque of the developing roller can throw the agglomerated toner outward onto the baffle, and the agglomerated toner can be collected through the curved surface, preventing the agglomerated toner from entering the transmission parts, which is beneficial to improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the novel device;
[0018] Figure 2 This is a schematic diagram of the three-dimensional local structure of the new device;
[0019] Figure 3 This is a schematic cross-sectional view of the three-dimensional structure of the novel device, showing the cross-sectional structure of the vibration mechanism;
[0020] Figure 4 This is a schematic cross-sectional view of the three-dimensional structure of the novel vibration mechanism;
[0021] Figure 5 This is a schematic diagram of the three-dimensional partial structure of the novel vibration mechanism;
[0022] Figure 6 This is a schematic diagram of the novel three-dimensional partial explosion structure;
[0023] Figure 7 For this new Figure 6 A in the figure is an enlarged structural diagram.
[0024] Explanation of the numbers in the figure: 1. Laser printer body; 2. Paper outlet; 3. Bracket; 4. Vibration mechanism; 401. Transmission rod; 402. Photosensitive drum; 402a. Gear ring; 403. Annular groove; 404. Limiting hole; 405. Limiting rod; 406. Spring; 407. Vibrating plate; 408. Elevating block; 5. Protective unit; 501. Protective frame; 501a. Through hole; 502. Baffle; 502a. Curved surface; 503. Limiting groove; 504. Limiting ring; 505. Developing roller; 505a. Gear 1; 6. Paper feeding unit; 601. Charging roller; 602. Paper feeding roller; 603. Gear 2. DETAILED DESCRIPTION
[0025] like Figures 1 to 7As shown, the present invention relates to a developing device for a laser printer, comprising a laser printer body 1 with a laser scanning unit, a paper outlet 2 being provided on the top of the laser printer body 1, brackets 3 being fixedly connected to the inner walls on both sides of the laser printer body 1, and a vibration mechanism 4 being provided on the opposite side of the two brackets 3; the vibration mechanism 4 comprises a transmission rod 401 and a protection unit 5; a paper feeding unit 6 is provided on the opposite side between the two brackets 3; the transmission rod 401 is fixedly connected between the two brackets 3, and a photosensitive drum 402 is movably sleeved on the outer wall of the transmission rod 401, an annular groove 403 being provided on the opposite side of the two brackets 3, and both ends of the transmission rod 401 and the photosensitive drum 402 respectively extend to the inner wall of one side of the annular groove 403, and a plurality of limiting holes 404 are provided on both ends of the photosensitive drum 402, and the limiting holes 404 are distributed in a circular array, and a limiting rod 405 is movably sleeved on the inner wall of each limiting hole 404, and a spring 406 is movably sleeved on the outer wall of the limiting rod 405, and one end of the spring 406 is fixedly connected to the inner wall of the photosensitive drum 402 Connected to the inner wall of one side of the limiting hole 404, one end of the limiting rod 405 is fixedly connected to a vibration plate 407, and a plurality of undulating blocks 408 are fixedly connected to the inner wall of the photosensitive drum 402. The two ends of the photosensitive drum 402 are respectively fixedly sleeved with gear rings 402a. The surface of the photosensitive drum 402 is scanned by the laser scanning unit. At this time, the surface of the photosensitive drum 402 is charged. The toner is printed on the paper through the photosensitive drum 402. In a humid environment, the electric field formed on the surface of the photosensitive drum 402 is affected, and its surface The toner will condense into lumps. During this process, the photosensitive drum 402 rotates on the transmission rod 401, and the two ends of the transmission rod 401 exert force on the limit rod 405 through the spring 406, so that the vibration plate 407 moves on the surface of the undulating block 408 and collides with it, thereby vibrating the photosensitive drum 402. The vibration force is transmitted from the two ends of the photosensitive drum 402 to the middle, which can vibrate the weakly adsorbed toner lumps from the surface of the photosensitive drum 402, preventing the condensed toner lumps from being printed on the paper.
[0026] In the embodiment of the present invention, the protective unit 5 includes two protective frames 501, the two protective frames 501 are respectively fixedly connected to the opposite side of the bracket 3, the two protective frames 501 are commonly fixedly connected to the opposite side of the baffle 502, the two brackets 3 are respectively provided with a limiting groove 503 on the opposite side, the two limiting grooves 503 are respectively movably sleeved with limiting rings 504 inside, the two brackets 3 are commonly movably sleeved with a developing roller 505 and the two limiting rings 504 are respectively fixedly connected to the two ends of the developing roller 505, and the two protective frames 501 are respectively provided with a through hole 501a on the opposite side and the photosensitive drum 402 passes through it. There are two through holes 501a, and a curved surface 502a is set on the top of the baffle 502. Gears 505a are fixedly mounted on both ends of the developing roller 505, and the gear ring 402a is meshed with the gear 505a. During use, the toner is discharged outward from the agitator in the ink cartridge. During this process, the toner clumps due to moisture, and the clumped toner is discharged from the ink cartridge through the developing roller 505. The baffle 502 can prevent the toner from adhering to the photosensitive drum 402, and the curved surface 502a can collect the condensed toner, preventing the toner lumps from entering the transmission components and affecting the normal use of the gears.
[0027] In the embodiment of the present invention, the paper feeding unit 6 includes a charging roller 601, which is movably sleeved between the two brackets 3 through a bearing and the charging roller 601 is in contact with the surface of the photosensitive drum 402. The paper feeding roller 602 is movably sleeved on the opposite side of the two brackets 3 through a bearing. Gear 2 603 is fixedly sleeved on both ends of the paper feeding roller 602, and gear 2 603 is meshed with the gear ring 402a. Before use in a humid environment, the charging roller 601 in the printer is first charged through a charging line to form an electric field, and contacts and rotates with the surface of the photosensitive drum 402 to form an electric field on the surface of the photosensitive drum 402. Then, the paper enters from the paper outlet 2 and the motor is operated through an external circuit mechanism (existing technology). The paper moves into the inside of the printer through the rotation of the transmission unit. When printing on paper in a humid environment, the toner passes through the stirring unit (existing technology) in the ink cartridge, so that the toner is brought out of the ink cartridge through the rotation of the developing roller 505.
[0028] Working principle: This embodiment provides a developing device for a laser printer. Before using it in a humid environment, the charging roller 601 in the printer is first charged through a charging line to form an electric field, and the charging roller 601 contacts and rotates with the surface of the photosensitive drum 402 to form an electric field on the surface of the photosensitive drum 402. Then, the paper enters from the paper outlet 2 and the motor is operated through an external circuit mechanism (existing technology). The paper is moved into the printer through the rotation of the transmission unit. When printing on paper in a humid environment, the toner passes through the stirring unit in the ink cartridge (existing technology) to be brought out of the ink cartridge through the rotation of the developing roller 505 and scanned on the surface of the photosensitive drum 402 by the laser scanning unit. At this time, the surface of the photosensitive drum 402 is attached with an electric charge, and the toner is printed on the paper through the photosensitive drum 402. In a humid environment, the electric field formed on the surface of the photosensitive drum 402 is affected, and its surface The toner will clump together. During this process, the photosensitive drum 402 rotates on the transmission rod 401, and the two ends of the transmission rod 401 exert force on the limit rod 405 through the spring 406, so that the vibration plate 407 moves on the surface of the undulating block 408 and collides with it, thereby generating vibration on the photosensitive drum 402. The vibration force is transmitted from the two ends of the photosensitive drum 402 to the middle, which can vibrate the weakly adsorbed toner lumps from the surface of the photosensitive drum 402, preventing the clumps of toner from being printed on the paper. During use, the toner is discharged from the agitator in the ink cartridge. During this process, the toner clumps due to moisture and is discharged from the ink cartridge through the developing roller 505. The baffle 502 can prevent the toner from adhering to the photosensitive drum 402, and the curved surface 502a can collect the clumps of toner, preventing the toner lumps from entering the transmission parts and affecting the normal use of the gears.
[0029] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Ordinary technicians in this field can easily understand the spirit of this invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of this invention, they are all within the scope of protection of this invention.
Claims
1. A developing device for a laser printer, characterized in that: A laser printer body (1) comprising a laser scanning unit, wherein a paper outlet (2) is provided on the top of the laser printer body (1), brackets (3) are fixedly connected to inner walls on both sides of the laser printer body (1), and a vibration mechanism (4) is provided on opposite sides of the two brackets (3); The vibration mechanism (4) includes a transmission rod (401) and a protection unit (5); A paper feeding unit (6) is provided on one side opposite to the two brackets (3); The transmission rod (401) is fixedly connected between the two brackets (3); the outer wall of the transmission rod (401) is movably sleeved with a photosensitive drum (402); an annular groove (403) is respectively provided on opposite sides of the two brackets (3); and both ends of the transmission rod (401) and the photosensitive drum (402) extend to the inner wall of one side of the annular groove (403); a plurality of limiting holes (404) are respectively provided on both ends of the photosensitive drum (402), and the limiting holes (404) are distributed in an annular array; a limiting rod (405) is movably sleeved on the inner wall of each limiting hole (404); a spring (406) is movably sleeved on the outer wall of the limiting rod (405), and one end of the spring (406) is fixedly connected to the inner wall of one side of the limiting hole (404); one end of the limiting rod (405) is fixedly connected to a vibration plate (407); and a plurality of undulating blocks (408) are fixedly connected to the inner wall of the photosensitive drum (402).
2. The developing device for a laser printer according to claim 1, wherein: Gear rings (402a) are fixedly sleeved on both ends of the photosensitive drum (402).
3. The developing device for a laser printer according to claim 2, characterized in that: The protection unit (5) comprises two protection frames (501), the two protection frames (501) are respectively fixedly connected to opposite sides of the bracket (3), and the opposite sides of the two protection frames (501) are commonly fixedly connected with a baffle (502).
4. The developing device for a laser printer according to claim 3, characterized in that: A limiting groove (503) is respectively provided on one opposite side of the two brackets (3), and a limiting ring (504) is movably sleeved inside the two limiting grooves (503). The two brackets (3) are movably sleeved with a developing roller (505) and the two limiting rings (504) are respectively fixedly connected to the two ends of the developing roller (505).
5. The developing device for a laser printer according to claim 4, characterized in that: Through holes (501a) are respectively provided on opposite sides of the two protective frames (501), and the photosensitive drum (402) passes through the two through holes (501a). A curved surface (502a) is provided on the top of the baffle (502).
6. The developing device for a laser printer according to claim 5, characterized in that: Gear 1 (505a) is fixedly sleeved on both ends of the developing roller (505), and the gear ring (402a) is meshedly connected with gear 1 (505a).
7. The developing device for a laser printer according to claim 6, characterized in that: The paper feeding unit (6) comprises a charging roller (601), which is movably sleeved between the two brackets (3) via a bearing, and the charging roller (601) is in contact with the surface of the photosensitive drum (402).
8. The developing device for a laser printer according to claim 7, characterized in that: A paper feed roller (602) is movably sleeved on one side of the two brackets (3) via a bearing, and two ends of the paper feed roller (602) are respectively fixedly sleeved with a second gear (603), and the second gear (603) is meshedly connected with the gear ring (402a).