WO2014121692A1

WO2014121692A1 - Cleaning scraper and processing box

Info

Publication number: WO2014121692A1
Application number: PCT/CN2014/071080
Authority: WO
Inventors: 杨晓锋; 马力
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2013-02-07
Filing date: 2014-01-22
Publication date: 2014-08-14
Also published as: CN103092043B; CN103092043A

Abstract

Provided are a cleaning scraper and a processing box. The cleaning scraper (9, 110, 130, 150, 170) comprises a scraper rest (91, 111, 131, 151, 171) and a blade (92, 112, 132, 152, 172). The blade (92, 112, 132, 152, 172) comprises a connecting part (95, 115, 135, 155, 175) connected to the scraper rest (91, 111, 131, 151, 171) and an operating part (96, 116, 136, 156, 176) which is in contact with a photosensitive drum, wherein the thickness of the operating part (96, 116, 136, 156, 176) is greater than that of the connecting part (95, 115, 135, 155, 175). The processing box comprises a shell. A chamber for housing consumables is enclosed by the shell, the photosensitive drum and the above-mentioned cleaning scraper (9, 110, 130, 150, 170) are arranged in the shell, and the cleaning scraper (9, 110, 130, 150, 170) is used for eliminating the residual developing agent on the surface of the photosensitive drum.

Description

Cleaning blade and process box

Technical field

The present invention relates to the field of printing consumables, and more particularly to a process cartridge and a cleaning blade mounted in the process cartridge for removing developer remaining on the photosensitive member. The present application is based on a Chinese patent application filed on Feb. 7, 2013, the application number of which is incorporated herein by reference.

Background technique

An image forming apparatus is an apparatus for forming an image on a recording material using an electrophotographic image forming apparatus, and the image forming apparatus includes a copying machine, a printer, a facsimile machine, and the like. The process cartridge used in the image forming apparatus is a unit cartridge including at least a developing roller as a developing device and a photosensitive drum, and the process cartridge is detachably mounted in the main body of the image forming apparatus.

A typical image imaging equipment laser printer, laser printer is one of the most extensive image imaging equipment, laser printer uses the physical, chemical principles of light, electricity, heat to output text or images on paper and other media.

Referring to Fig. 1, Fig. 1 is an image forming main component process cartridge 1 of a laser printer. The process cartridge 1 includes a casing including a waste toner box 11 containing a residual developer such as carbon powder, and a developer such as carbon for image formation. The powder silo 12 is powdered, and both ends of the process cartridge 1 are the left side wall 13 and the right side wall 15.

Referring to Fig. 2, Fig. 2 is an exploded perspective view showing the process cartridge 1 in which the components such as the powder bin and the waste toner compartment are omitted. As seen from Fig. 2, the process cartridge 1 is provided with a cleaning blade 14, a charging roller 16, a photosensitive drum 17, and development. Roller 18, powder feed roller 19.

The basic working process of the laser printer can be divided into seven processes of charging, exposing, developing, transferring, fixing, cleaning, and discharging: in the charging process, the laser printer uniformly uses the charging roller 16 to the surface of the photosensitive drum 17 by corona. Charge the predetermined charge. During the exposure process, the surface of the photosensitive drum 17 which has been charged with a uniform predetermined charge is selectively exposed. Since the photosensitive drum 17 has a photosensitive property, the electric charge of the exposed region will be erased by the ground, so that an electrostatic latent image distributed by the electric charge is formed on the surface of the photosensitive drum 17. In the developing process, the toner stored in the powder silo is conveyed to the developing roller 18 by the powder feeding roller 19, and the developing roller 18 transfers the toner to the electrostatic latent image area on the surface of the photosensitive drum 17 by the electric field force, so that the electrostatic latent image Get visualization. In the transfer process, the toner on the electrostatic latent image on the surface of the photosensitive drum 17 is transferred onto the paper by a transfer device such as a transfer roller. In the fixing process, the toner on the paper is fixed to the paper by the fixing device. In the cleaning process, the toner remaining on the surface of the photosensitive drum 17 is scraped off by the cleaning blade 14 and stored in the waste toner box to prevent the residual toner from entering the next image forming cycle, causing printing defects.

As can be seen from the above imaging process, the cleaning blade is particularly important in the imaging process. When the cleaning blade cannot remove residual toner, it will seriously affect the next imaging cycle and cause problems such as gray bottom.

As shown in FIG. 3, the conventional cleaning blade 14 includes a blade holder 141 and a blade 142. The working principle is as shown in FIG. 4. One end of the blade holder 141 of the cleaning blade 14 is fixedly coupled to the process cartridge housing, and the blade 142 has a A connecting portion to which the tool holder 141 is connected and a working portion that is in contact with the photosensitive drum 17. Since the working portion of the blade 142 is in close contact with the surface of the photosensitive drum, when the photosensitive drum 17 enters the cleaning process, the residual toner on the surface is scraped off by the working portion of the blade 142 and falls into the waste toner box, thereby effectively cleaning the photosensitive drum. The surface allows the photosensitive drum to smoothly proceed to the next imaging cycle.

As shown in FIG. 5, another conventional cleaning blade 5 has a holder 51 and a blade 52. As shown in FIG. 6, one end of the holder 51 of the cleaning blade 5 is fixedly coupled to the process cartridge housing, and the blade 52 has a connecting portion connected to the blade holder 51 and a working portion in contact with the photosensitive drum.

As shown in FIG. 7, another conventional cleaning blade 7 has a holder 71 and a blade 72. As shown in FIG. 8, one end of the holder 71 of the cleaning blade 7 is fixedly coupled to the process cartridge housing, and the blade 72 has A connecting portion to which the tool holder 71 is connected and a working portion that is in contact with the photosensitive drum.

Generally, the blade is a rubber strip made of PU (polyurethane) material, and the blade is also elastic because the material property of the rubber strip is elastic.

technical problem

However, since the thickness of the blade working portion in the prior art is less than or equal to the thickness of the blade connecting portion, the resilience of the blade and the cleaning force are insufficient.

With the continuous development of technology, the various parts and components used in the processing box of laser printers have been greatly improved. At the same time, the quality of the toner currently used has been greatly improved, and the particles of toner are getting more and more. Small, the shape is getting more and more round. With the development of the toner technology, the resilience of the cleaning blade in the process cartridge and the problem of insufficient cleaning force have become more and more prominent, and the cleaning blade often fails to effectively remove the residual toner particles on the surface of the photosensitive drum.

Technical solution

The main object of the present invention is to provide a cleaning blade having better resilience and cleaning power.

Another object of the present invention is to provide a process cartridge in which a cleaning blade having a better resilience and cleaning force is mounted.

In order to achieve the above main object, the present invention provides a cleaning blade comprising a tool holder and a blade, the blade having a connecting portion connected to the tool holder and a working portion contacting the photosensitive drum, wherein the working portion has a thickness greater than that of the connecting portion thickness.

In a preferred embodiment, the connecting portion has a first end surface that abuts an end surface of the tool holder, the blade is provided with a second end surface opposite to the first end surface, and the working portion has a third end surface located below the first end surface, and the third end surface The distance from the second end surface is greater than the distance between the first end surface and the second end surface.

In a further solution, a connection surface is formed between the first end surface and the third end surface, and the connection surface is perpendicular to the first end surface.

A further solution is that the first end surface and the third end surface have a connecting surface, and the angle formed by the connecting surface and the first end surface is an obtuse angle.

Optionally, the blade has a first end surface that abuts one end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a third end surface located below the second end surface, and the third end surface The distance from the first end surface is greater than the distance between the second end surface and the first end surface.

In another optional solution, the connecting portion has a first end surface that abuts an end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a third end surface located below the first end surface and The fourth end surface located below the second end surface, the distance between the third end surface and the fourth end surface is greater than the distance between the first end surface and the second end surface.

In order to achieve the above other object, the present invention provides a process cartridge including a casing, the casing enclosing a cavity for accommodating carbon powder, one end of the cavity is provided with a powder outlet, and the process cartridge is further provided with a shell a photosensitive drum in the body, the process cartridge is further provided with a cleaning blade, one end of which is fixed on the casing, the cleaning blade comprises a tool holder and a blade, and the blade has a connecting portion connected with the tool holder and a working portion contacting the photosensitive drum, wherein The thickness of the portion is greater than the thickness of the connecting portion.

Beneficial effect

Since the thickness of the working portion of the blade of the cleaning blade provided by the present invention in contact with the photosensitive drum is greater than the thickness of the connecting portion connected to the blade and the blade holder, with this configuration, the working portion of the blade has a better resilience, so that the blade Better adhesion to the drum, thus increasing the cleaning force so that the next imaging cycle is not affected.

Moreover, since the working portion thickness of the blade is larger than the thickness of the connecting portion, the working portion of the blade will have better resilience, and at the same time, the simple structure of the blade is utilized, the production process is simplified, and the production cost of the cleaning blade is reduced.

In addition, a connecting surface is disposed between the first end surface and the third end surface of the blade, and the connecting surface is perpendicular to the first end surface, and the configuration of the blade connecting surface can be matched with the configuration of the existing tool holder, and the cleaning blade and the photosensitive device are matched. When the drum is in contact with the work, the maximum elastic deformation of the blade is restricted, the blade is protected from damage caused by improper force, and the blade is also guaranteed to have good resilience.

In an optional solution, the angle formed by the connecting surface and the first end surface is an obtuse angle, which does not match the structure of the tool holder, which can make the blade release some resilience limitation, thereby providing better resilience. Used to better adhere to the drum and improve cleaning power.

Moreover, since the blade is in contact with the photosensitive drum, the use time is long, and the problem of blade loss is inevitable, so the distance between the third end surface and the first end surface of the blade is larger than that of the second end surface and the first end surface. The distance between the blades can extend the life of the blade.

In addition, the blade can not only use the tool holder to limit the maximum elastic deformation to protect the blade from damage, but also make the blade more durable and extend the life of the blade.

The cleaning blade provided by the invention is provided with the above-mentioned cleaning blade, which can improve the problem of bottom ash, blurring and the like which occur in the image forming process, and improve the printing quality of the process cartridge.

DRAWINGS

Fig. 1 is a structural view of a process cartridge in the prior art.

2 is a structural exploded view of a process cartridge in the prior art.

Fig. 3 is a left side view of the cleaning blade of the prior art process cartridge.

4 is a schematic view showing the structure of a cleaning blade and a photosensitive drum in the prior art.

Figure 5 is a perspective view of a second cleaning blade of the prior art.

Figure 6 is a left side view of a second cleaning blade of the prior art.

Figure 7 is a perspective view of a third type of cleaning blade in the prior art.

Figure 8 is a left side view of a third type of cleaning blade in the prior art.

Figure 9 is a perspective view of a cleaning blade of the first embodiment of the present invention.

Figure 10 is a left side view of the cleaning blade of the first embodiment of the present invention.

Figure 11 is a perspective view of a cleaning blade of a second embodiment of the present invention.

Figure 12 is a left side view of the cleaning blade of the second embodiment of the present invention.

Figure 13 is a perspective view of a cleaning blade of a third embodiment of the present invention.

Figure 14 is a left side view of the cleaning blade of the third embodiment of the present invention.

Figure 15 is a perspective view of a cleaning blade of a fourth embodiment of the present invention.

Figure 16 is a left side view of the cleaning blade of the fourth embodiment in the present invention.

Figure 17 is a perspective view of a cleaning blade of a fifth embodiment of the present invention.

Figure 18 is a left side view of the cleaning blade of the fifth embodiment of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiments of the invention

The present invention is mainly directed to the improvement of the blade of the cleaning blade, so how the cleaning blade is mounted to the casing of the process cartridge and how the blade is attached to the blade holder is not the main invention of the present invention and will not be described again. The improvement of the structure of the cleaning blade of the present invention is mainly discussed below.

First embodiment:

9 is a perspective view of a cleaning blade 9 according to a first embodiment of the present invention. As seen from FIG. 9, the cleaning blade 9 includes a blade holder 91 and a blade 92, and one end of the holder 91 is fixedly coupled to the housing of the process cartridge. The blade 92 has a connecting portion 95 connected to the other end of the holder 91, and the blade 92 also has a working portion 96 that works in contact with the photosensitive drum.

Referring to Fig. 10, it is clear from the left side view of the cleaning blade of the first embodiment that the holder 91 of the cleaning blade 9 has an end surface 91a that abuts the blade 92, and the blade 92 also has an end surface 92a that abuts the holder 91, and The end surface 92a faces the end surface 92c, and the end surface 92a is the end surface 92b. The end face 92a is located on the connecting portion 95 of the blade 92, and the end face 92b is located on the working portion 96 of the blade 92. Further, the distance between the end surface 92a and the end surface 92c is L1, the distance between the end surface 92b and the end surface 92c is L2, and L2 is larger than L1, and the left side view of the blade 92 has an inverted "7" shape.

A connecting surface 93 is provided between the end surface 92a and the end surface 92b. As can be seen from Fig. 10, the connecting surface 93 is perpendicular to the end surface 92a.

Second embodiment:

Referring to Figure 11, which is a perspective view of a cleaning blade 110 according to a second embodiment of the present invention, it can be seen from Figure 11 that the cleaning blade 110 includes a blade holder 111 and a blade 112, and one end of the blade holder 111 is fixed to the casing of the process cartridge. Connected, the blade 112 has a connection portion 115 that is coupled to the other end of the tool holder 111, and the blade 112 also has a working portion 116 that operates in contact with the photosensitive drum.

Referring to Fig. 12, it is clear from the left side view of the cleaning blade of the second embodiment that the holder 111 of the cleaning blade 11 has an end surface 111a that abuts the blade 112, and the blade 112 also has an end surface 112a that abuts the holder 111, and The end surface 112a faces the end surface 112c, and the end surface 112b is provided below the end surface 112a. The end face 112a is located on the connecting portion 115 of the blade 112, and the end face 112b is located on the working portion 116 of the blade 112. Further, the distance between the end surface 112a and the end surface 112c is L3, the distance between the end surface 112b and the end surface 112c is L4, and L4 is larger than L3, and the left side view of the blade 112 has a trapezoidal shape.

A connection surface 113 is connected between the end surface 112a and the end surface 112b, and an angle formed between the connection surface 113 and the end surface 112a is an obtuse angle.

Third embodiment:

Referring to Figure 13, there is shown a perspective view of a cleaning blade 130 according to a third embodiment of the present invention. As can be seen from Figure 13, the cleaning blade 130 includes a blade holder 131 and a blade 132, and one end of the blade holder 131 is fixed to the casing of the process cartridge. Connected, the blade 132 has a connection portion 135 that is coupled to the other end of the tool holder 131, and the blade 132 also has a working portion 136 that operates in contact with the photosensitive drum.

Referring to Fig. 14, it is clear from the left side view of the cleaning blade of the third embodiment that the holder 131 of the cleaning blade 13 has an end surface 131a that abuts the blade 132, and the blade 132 also has an end surface 132a that abuts the holder 131, and The end surface 132a faces the end surface 132c, and the end surface 132b is provided below the end surface 132a. The end face 132a is located on the connecting portion 135 of the blade 132, and the end face 132b is located on the working portion 136 of the blade 132. Further, the distance between the end surface 132a and the end surface 132c is L5, the distance between the end surface 132b and the end surface 132c is L6, and L6 is larger than L5, and the left side view of the blade 132 has an inverted "7" shape.

A connecting surface 133 is provided between the end surface 132a and the end surface 132b. As can be seen from Fig. 14, the connecting surface 133 is perpendicular to the end surface 132a.

Fourth embodiment:

Referring to Fig. 15, which is a perspective view of a cleaning blade 150 according to a third embodiment of the present invention, as seen from Fig. 15, the cleaning blade 150 includes a blade holder 151 and a blade 152, and one end of the blade holder 151 is fixed to the casing of the process cartridge. Connected, the blade 152 has a connection portion 155 that is coupled to the other end of the tool holder 151, and the blade 152 also has a working portion 156 that operates in contact with the photosensitive drum.

Referring to Fig. 16, it is clear from the left side view of the cleaning blade of the fourth embodiment that the holder 151 of the cleaning blade 15 has an end surface 151a that abuts the blade 152, and the blade 152 also has an end surface 152a that abuts the holder 151, and The end surface 152a faces the end surface 152b, and an end surface 152c is provided below the end surface 152a, and an end surface 152d is provided opposite to the end surface 152c. The end surface 152a and the end surface 152b are located on the connecting portion 155 of the blade 152, and the end surface 152c and the end surface 152d are located on the working portion 156 of the blade 152. Further, the distance between the end surface 152a and the end surface 152b is L7, the distance between the end surface 152c and the end surface 152d is L8, and L8 is larger than L7, and the left side view of the blade 152 has a "convex" shape.

A connecting surface 153 is disposed between the end surface 152a and the end surface 152c, and a connecting surface 154 is disposed between the end surface 152b and the end surface 152d. The connecting surface 153 is perpendicular to the end surface 152a, the connecting surface 154 is perpendicular to the end surface 152b, and the length of the connecting surface 154 is Greater than the length of the connecting surface 153.

Fifth embodiment:

Referring to Fig. 17, which is a perspective view of a cleaning blade 170 according to a third embodiment of the present invention, as seen from Fig. 17, the cleaning blade 170 includes a blade holder 171 and a blade 172, and one end of the holder 171 is fixed to the casing of the process cartridge. Connected, the blade 172 has a connection portion 175 that is coupled to the other end of the tool holder 171, and the blade 172 also has a working portion 176 that operates in contact with the photosensitive drum.

Referring to Fig. 18, it is clear from the left side view of the cleaning blade of the fifth embodiment that the holder 171 of the cleaning blade 17 has an end surface 171a that abuts the blade 172, and the blade 172 also has an end surface 172a that abuts the holder 171, and The end surface 172a faces the end surface 172c, and the end surface 172c is provided below the end surface 172b. The end face 172b is located on the connecting portion 175 of the blade 172, and the end face 172c is located on the working portion 176 of the blade 172. The distance between the end surface 172a and the end surface 172b is L9, the distance between the end surface 172a and the end surface 172c is L10, and L10 is larger than L9, and the left side view of the blade 172 has an inverted "7" shape.

A connection surface 173 is provided between the end surface 172b and the end surface 172c, and the connection surface 173 is perpendicular to the end surface 172b.

Processing box embodiment:

The process cartridge of this embodiment includes a housing that encloses a cavity in which the toner is accommodated, and one end of the cavity is provided with a powder outlet, and the carbon powder can flow out from the powder outlet. The process cartridge further includes a photosensitive drum, and is disposed in the casing, the process cartridge further comprising the cleaning blade of any of the above embodiments, one end of the cleaning blade is fixed on the casing, the cleaning blade comprises a blade holder and a blade, and the blade has a tool holder a connected connecting portion and a working portion in contact with the photosensitive drum, wherein the working portion has a thickness greater than a thickness of the connecting portion.

Finally, it should be emphasized that the present invention is not limited to the above embodiments. For example, the cleaning blade adopts a blade of other shapes, and it should be included in the scope of protection of the present invention as long as the thickness of the working portion is larger than the thickness of the connecting portion.

Industrial applicability

The cleaning blade of the present invention is applied to a process cartridge having a photosensitive drum, and the cleaning blade of the present invention can provide corresponding embodiments to solve the problem of insufficient resilience and insufficient cleaning for the tool holders of different cleaning blades of the prior art. The problem is that by setting the working portion thickness of the blade to be larger than the thickness of the connecting portion, the working portion of the blade has a better resilience, so that the blade can better adhere to the photosensitive drum, thereby improving the cleaning force, so that the lower One imaging cycle is unaffected. At the same time, the invention also makes the cleaning blade more durable and prolongs the service life of the cleaning blade. The process cartridge in which the cleaning blade of the above embodiment is mounted avoids the occurrence of problems such as bottom ash, blur, and the like, and improves the printing quality of the process cartridge.

Claims

Cleaning blade, including

a tool holder and a blade, the blade having a connecting portion connected to the tool holder and a working portion contacting the photosensitive drum;

It is characterized by:

The thickness of the working portion is greater than the thickness of the connecting portion.
A cleaning blade according to claim 1, wherein:

The connecting portion has a first end surface abutting one end surface of the tool holder, the blade is provided with a second end surface opposite to the first end surface, and the working portion has a first portion located below the first end surface a third end surface, a distance between the third end surface and the second end surface is greater than a distance between the first end surface and the second end surface.
A cleaning blade according to claim 2, wherein:

A connecting surface is formed between the first end surface and the third end surface, and the connecting surface is perpendicular to the first end surface.
A cleaning blade according to claim 2, wherein:

A connecting surface is formed between the first end surface and the third end surface, and an angle formed by the connecting surface and the first end surface is an obtuse angle.
A cleaning blade according to claim 1, wherein:

The blade has a first end face that abuts an end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a second portion below the second end surface a third end surface, a distance between the third end surface and the first end surface is greater than a distance between the second end surface and the first end surface.
A cleaning blade according to claim 1, wherein:

The connecting portion has a first end surface that abuts an end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a lower end portion than the first end surface a third end surface and a fourth end surface located below the second end surface, and a distance between the third end surface and the fourth end surface is greater than a distance between the first end surface and the second end surface.
Processing box, including

a housing surrounding the cavity for containing toner, and one end of the cavity is provided with a powder outlet;

a photosensitive drum, the photosensitive drum being mounted in the housing;

a cleaning blade having one end fixed to the housing, the cleaning blade including a blade holder and a blade, the blade having a connection portion connected to the tool holder and a working portion contacting the photosensitive drum ;

It is characterized by:

The thickness of the working portion is greater than the thickness of the connecting portion.
The process cartridge according to claim 7, wherein:

The connecting portion has a first end surface abutting one end surface of the tool holder, the blade is provided with a second end surface opposite to the first end surface, and the working portion has a first portion located below the first end surface a third end surface, a distance between the third end surface and the second end surface is greater than a distance between the first end surface and the second end surface.
The process cartridge according to claim 8, wherein:

A connecting surface is formed between the first end surface and the third end surface, and the connecting surface is perpendicular to the first end surface.
The process cartridge according to claim 8, wherein:

A connecting surface is formed between the first end surface and the third end surface, and an angle formed by the connecting surface and the first end surface is an obtuse angle.
The process cartridge according to claim 7, wherein:

The blade has a first end face that abuts an end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a second portion below the second end surface a third end surface, a distance between the third end surface and the first end surface is greater than a distance between the second end surface and the first end surface.
The process cartridge according to claim 7, wherein:

The connecting portion has a first end surface that abuts an end surface of the tool holder, the connecting portion is provided with a second end surface opposite to the first end surface, and the working portion has a lower end portion than the first end surface a third end surface and a fourth end surface located below the second end surface, and a distance between the third end surface and the fourth end surface is greater than a distance between the first end surface and the second end surface.