Doctor blade capable of preventing carbon powder from leaking

Abstract

The utility model relates to the technical field of printing equipment, in particular to an anti-carbon powder leakage doctor blade which comprises a doctor blade body, a motor is installed at the top of the doctor blade body, an eccentric wheel is connected to an output shaft of the motor, and fixing bases are connected to the left end and the right end of the front side of the doctor blade body. The top of the first guide rod is jointly connected with a connecting plate, the eccentric wheel is in extrusion fit with the connecting plate, the bottom of the first guide rod is connected with a pressing plate, the first guide rod is sleeved with a first reset spring, the upper end of the first reset spring is connected with the fixing base, and the lower end of the first reset spring is connected with the pressing plate. A buffering assembly used for buffering contact of the pressing plate is arranged at the bottom of the pressing plate. The eccentric wheel is driven by the motor to rotate, so that the protection pad on the outer ring of the eccentric wheel is in flexible contact with the connecting plate, the pressing plate is pushed to slide along the surface of the doctor blade, the function of periodically and automatically scraping away carbon powder adhered to the surface of the doctor blade is achieved, and finally the purpose of maintaining the clean state of the doctor blade without manual disassembly is achieved.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a toner-proof toner discharge blade. Background Technology

[0002] With the rapid development of the information age, laser printers, as an important part of office equipment, have received widespread attention for their print quality and operational stability. The toner ejector blade, as a key component of the developing system, works closely with the developing roller to precisely adjust the toner layer thickness, thereby ensuring that the toner is evenly transferred to the paper surface.

[0003] In laser printers, the developing roller attracts toner through electrostatic attraction, forming a uniform toner layer. The toner ejector blade then forms a slit by contacting the surface of the developing roller. Through the combined action of mechanical extrusion and an electrostatic field, the thickness of the toner layer is limited to the micrometer level. Currently, most mainstream toner ejector blades are made of elastic metal sheets or polymer materials. Their design must balance hardness, wear resistance, and elastic deformation capacity to ensure a dynamic seal with the developing roller.

[0004] However, the existing technology still has limitations in the cooperation between the toner ejector blade and the developing roller. Under the dual action of high voltage electrostatic field and mechanical friction, toner is easy to adhere to the surface of the toner ejector blade. Users need to disassemble the printer to clean the toner ejector blade. During long-term use, the toner ejector blade will have uneven contact pressure with the developing roller due to toner adhesion, which will aggravate wear or deformation, resulting in surface roughness and further causing toner leakage. This seriously affects print quality and equipment reliability, forming a vicious cycle. Utility Model Content

[0005] To overcome the drawbacks of manual cleaning required for toner adhesion and leakage, this invention provides a toner leakage prevention and discharge knife, aiming to solve the above-mentioned shortcomings.

[0006] A toner leakage prevention knife includes a toner discharge knife, a motor mounted on the top of the toner discharge knife, an eccentric wheel connected to the output shaft of the motor, fixed seats connected to the left and right ends of the front side of the toner discharge knife, a first guide rod slidably connected inside the fixed seats, a connecting plate connected to the top of the first guide rod, the eccentric wheel and the connecting plate being press-fitted together, a pressure plate connected to the bottom of the first guide rod, a first return spring sleeved on the first guide rod, one end of the first return spring being connected to the fixed seat, the other end being connected to the pressure plate, the rear side of the pressure plate being in contact with the toner discharge knife, and a buffer assembly for buffering contact with the pressure plate being provided at the bottom of the pressure plate.

[0007] As a preferred embodiment of this utility model, the buffer assembly includes a contact plate, a second guide rod is slidably connected to the lower end of the pressure plate, the lower end of the second guide rod is connected to the contact plate, a second return spring is sleeved on the lower part of the second guide rod, one end of the second return spring is connected to the pressure plate, and the other end is connected to the contact plate.

[0008] As a preferred embodiment of this utility model, a sealing gasket is connected to the bottom side of the contact plate.

[0009] As a preferred embodiment of this utility model, baffles are connected to both the left and right ends of the top of the contact plate, and the baffles are slidably connected to the pressure plate.

[0010] As a preferred embodiment of this utility model, the outer ring of the eccentric wheel is fitted with a protective pad, and the protective pad is slidably connected to the connecting plate.

[0011] As a preferred embodiment of this utility model, the outer ring of the first guide rod is provided with a telescopic pad, the telescopic pad wraps around the first reset spring, the upper end of the telescopic pad is connected to the fixed seat, and the lower end is connected to the pressure plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The eccentric wheel is driven to rotate by a motor, so that the protective pad on the outer ring of the eccentric wheel makes flexible contact with the connecting plate, pushing the pressure plate to slide along the surface of the powder discharge blade, thereby realizing the function of periodically and automatically scraping off the toner adhering to the surface of the powder discharge blade, and finally achieving the purpose of maintaining the clean state of the powder discharge blade without manual disassembly.

[0014] 2. By designing the lower edge of the pressure plate to be flush with the lower end of the toner blade, and combining this with the elastic deformation of the flexible sealing gasket at the bottom of the contact plate, a dynamic seal is formed between the sealing gasket and the printer base. This physically blocks the toner leakage path during the cleaning process, ultimately preventing toner from spreading and contaminating other components inside the printer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the installation structure of the first guide rod and pressure plate of this utility model.

[0017] Figure 3 This is a cross-sectional view of the mounting structure of the second guide rod and the second reset spring of this utility model.

[0018] The markings in the diagram are as follows: 1-Powder discharge blade, 2-Motor, 3-Eccentric wheel, 4-Fixed base, 5-Connecting plate, 6-First guide rod, 7-Pressure plate, 8-First return spring, 9-Contact plate, 10-Second guide rod, 11-Second return spring, 12-Sealing gasket, 13-Baffle, 14-Protective pad, 15-Telescopic pad. Detailed Implementation

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] Example: A toner leakage prevention powder discharge knife, such as Figures 1-3 As shown, the printer includes a toner dispensing blade 1, a motor 2, an eccentric wheel 3, a fixed base 4, a connecting plate 5, a first guide rod 6, a pressure plate 7, a first return spring 8, and a buffer assembly. The toner dispensing blade 1 is installed inside the printer and dynamically contacts the surface of the developing roller to precisely control the toner layer thickness. The motor 2 is installed on the top of the toner dispensing blade 1, and the output shaft of the motor 2 is connected to the eccentric wheel 3. Fixed bases 4 are welded to both the left and right ends of the front side of the toner dispensing blade 1. The first guide rod 6 is slidably connected inside the fixed base 4. The connecting plate 5 is welded to the top of the first guide rod 6. The eccentric wheel 3 and the connecting plate 5 are pressed together. The pressure plate 7 is welded to the bottom of the two first guide rods 6. The first return spring 8 is sleeved on the first guide rod 6. The upper end of the first return spring 8 is pressed together with the fixed base 4, and the lower end is pressed together with the pressure plate 7. The rear side of the pressure plate 7 is in contact with the toner dispensing blade 1. The pressure plate 7 moves along the surface of the toner dispensing blade 1 to scrape off the adhering toner, realizing automated cleaning. A buffer assembly is provided at the bottom of the pressure plate 7 to buffer the contact of the pressure plate 7.

[0021] like Figure 2 and Figure 3 As shown, the buffer assembly includes a contact plate 9, a second guide rod 10, and a second return spring 11. The lower end of the pressure plate 7 is slidably connected to the second guide rod 10, and the lower end of the second guide rod 10 is connected to the contact plate 9. The lower part of the second guide rod 10 is fitted with the second return spring 11. The upper end of the second return spring 11 is connected to the pressure plate 7, and the lower end is connected to the contact plate 9. Through the cooperation of the second guide rod 10 and the second return spring 11, a flexible buffer design is formed to reduce the hard collision between the pressure plate 7 and the base and reduce component wear.

[0022] like Figure 3 As shown, it also includes a sealing gasket 12, and the bottom of the contact plate 9 is connected to the sealing gasket 12.

[0023] like Figure 3 As shown, it also includes a baffle 13. The left and right ends of the top of the contact plate 9 are connected to the baffle 13. The baffle 13 is slidably connected to the pressure plate 7. The baffle 13 always covers the connection gap between the pressure plate 7 and the contact plate 9, effectively isolating the toner.

[0024] like Figure 2 As shown, it also includes a protective pad 14. The outer ring of the eccentric wheel 3 is fitted with a protective pad 14. The protective pad 14 is slidably connected to the connecting plate 5. By reducing direct metal-to-metal friction, the wear of the transmission components is reduced, while the accumulation of static electricity is suppressed and carbon powder adsorption is avoided.

[0025] like Figure 1 As shown, it also includes a telescopic pad 15. The outer ring of the first guide rod 6 is provided with a telescopic pad 15. The telescopic pad 15 wraps around the first reset spring 8. The upper end of the telescopic pad 15 is connected to the fixed seat 4, and the lower end is connected to the pressure plate 7. The telescopic pad 15 moves and extends with the pressure plate 7, always sealing the gap between the fixed seat 4 and the pressure plate 7, preventing carbon powder from entering the area of ​​the first reset spring 8, avoiding the spring from losing its elasticity due to powder accumulation, and maintaining the long-term stability of the reset function.

[0026] During a printing task, the toner ejector blade 1 maintains dynamic contact with the developing roller, reducing toner adhesion through a special surface coating. Its blade edge forms a micron-level uniform gap with the developing roller surface. Under the combined action of mechanical extrusion and an electrostatic field, the thickness of the toner layer adsorbed by the developing roller is precisely controlled within a set range. At this time, the toner flows through the gap in a laminar flow state, ensuring a stable amount of toner transferred to the photoconductor, laying the foundation for forming a clear printed image.

[0027] When the printer enters standby mode, the control system triggers a self-cleaning program: motor 2 starts synchronously, driving eccentric wheel 3 to rotate at low speed. The protective pad 14 on the outer ring of eccentric wheel 3 flexibly contacts the connecting plate 5, and drives the connecting plate 5 to move vertically downward through periodic thrust; the protective pad 14 reduces friction and static electricity accumulation, ensuring the long-term reliability and cleaning efficiency of the drive assembly. The connecting plate 5 synchronously pushes the two first guide rods 6 to slide along the fixed base 4, and the first return spring 8 is stretched and stores energy. The pressure plate 7 at the end of the first guide rod 6 then moves in conjunction with the surface of the toner blade 1, and its cutting edge scrapes off the residual toner adhering to the working surface of the toner blade 1 with specific pressure. To thoroughly clean the end area, the lower edge of the pressure plate 7 is designed to be flush with the lower end of the toner blade 1. When the pressure plate 7 moves to its limit position, the sealing gasket 12 first contacts the printer base and fills the assembly gap through elastic deformation. At the same time, the contact plate 9 retracts into the pressure plate 7 along the second guide rod 10 after being pressed. The second return spring 11 is compressed and stores energy. The baffle 13 forms a physical barrier while guiding the contact plate 9 to slide smoothly, preventing the scraped toner from entering the interior of the pressure plate 7, thereby extending the service life of the buffer assembly and cleaning mechanism.

[0028] After the cleaning process is completed, motor 2 drives eccentric wheel 3 to continue rotating to the reset angle, with its proximal end contacting the upper surface of connecting plate 5. At this time, the first reset spring 8 releases its elastic potential energy, pulling the pressure plate 7 to move upward and reset quickly. The second reset spring 11 simultaneously rebounds, pushing the contact plate 9 outward, and the sealing gasket 12 returns to its initial shape. The baffle 13 slides with the contact plate 9 to its maximum stroke position, forming a complete protective boundary. Finally, all components return to standby mode, motor 2 stops running, and the system awaits the next cleaning command. Through periodic automatic cleaning, the working surface of the powder discharge blade 1 remains clean, effectively avoiding leakage problems caused by toner accumulation and significantly extending the maintenance cycle of the developing unit.

[0029] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A powder discharge knife for preventing toner leakage, characterized in that: The device includes a powder dispensing blade (1), a motor (2) mounted on the top of the powder dispensing blade (1), an eccentric wheel (3) connected to the output shaft of the motor (2), a fixed seat (4) connected to the left and right ends of the front side of the powder dispensing blade (1), a first guide rod (6) slidably connected inside the fixed seat (4), a connecting plate (5) connected to the top of the first guide rod (6), the eccentric wheel (3) and the connecting plate (5) being pressed together, a pressure plate (7) connected to the bottom of the first guide rod (6), a first return spring (8) sleeved on the first guide rod (6), one end of the first return spring (8) being connected to the fixed seat (4), and the other end being connected to the pressure plate (7), the rear side of the pressure plate (7) being in contact with the powder dispensing blade (1), and a buffer assembly for buffering the contact of the pressure plate (7) being provided at the bottom of the pressure plate (7).

2. The toner leakage prevention knife as described in claim 1, characterized in that: The buffer assembly includes a contact plate (9), and a second guide rod (10) is slidably connected to the lower end of the pressure plate (7). The lower end of the second guide rod (10) is connected to the contact plate (9), and a second return spring (11) is sleeved on the lower part of the second guide rod (10). One end of the second return spring (11) is connected to the pressure plate (7), and the other end is connected to the contact plate (9).

3. The powder discharge knife for preventing carbon powder leakage as described in claim 2, characterized in that: A sealing gasket (12) is connected to the bottom side of the contact plate (9).

4. The powder discharge knife for preventing toner leakage as described in claim 2, characterized in that: The contact plate (9) is connected to baffles (13) at both the left and right ends of the top, and the baffles (13) are slidably connected to the pressure plate (7).

5. The toner leakage prevention knife as described in claim 1, characterized in that: The outer ring of the eccentric wheel (3) is fitted with a protective pad (14), and the protective pad (14) is slidably connected to the connecting plate (5).

6. The toner leakage prevention powder discharge knife as described in claim 1, characterized in that: The first guide rod (6) has a telescopic pad (15) on its outer ring. The telescopic pad (15) wraps around the first reset spring (8). The upper end of the telescopic pad (15) is connected to the fixed seat (4), and the lower end is connected to the pressure plate (7).

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