WO2013067891A1

WO2013067891A1 - Processing cartridge

Info

Publication number: WO2013067891A1
Application number: PCT/CN2012/083741
Authority: WO
Inventors: 李胜夫; 李志恒
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2011-11-08
Filing date: 2012-10-30
Publication date: 2013-05-16
Also published as: CN202306147U

Abstract

A processing cartridge includes: a cartridge body(2)； a developing roller(4),rotatablely supported on the cartridge body；a sealing blade(1),one end of which is bonded to the cartridge body, the other end opposite to the end is a free end, and the edge of the free end is in linear contact with a roller body in the axial direction and can slide relatively；elastic sealing members(3),respectively placed at two ends of the roller body of the developing roller, wound around the circumferential surface of the roller body, and in slide contact with the roller body; the elastic sealing members are bonded to the cartridge body; two sides of the free end of the sealing blade are respectively clamped by two ends of the roller body and the head portions of the elastic sealing members; the first width of the two clamped sides of the free end of the sealing blade in the axial direction is smaller than the second width of the head portions of the elastic sealing members in the axial direction.

Description

Processing box

The present invention relates to a process cartridge. The present invention is based on a Chinese utility model patent application filed on Nov. 08, 2011, with the application number of 201120439205.1, the content of which is incorporated herein by reference.

Laser printers use the physical, chemical principles of light, electricity, and heat to output text or images. The basic process can be divided into seven steps: charging, exposure, development, transfer, fixing, cleaning, and power-saving. First, the surface of the photosensitive drum is uniformly charged by the charging roller. The laser scanner emits a modulated laser light containing image information to the photosensitive drum to form an electrostatic latent image corresponding to the image to be reproduced on the surface of the photosensitive drum. Then, the toner from the developing roller is adsorbed on the surface of the photosensitive drum to convert the electrostatic latent image into a visible image. With the rotation of the photosensitive drum and the positive voltage applied to the back surface of the recording medium such as paper by the transfer roller, the negatively charged toner forming a visible image on the surface of the photosensitive drum is attracted, and the toner is formed. The image is transferred to a recording medium such as paper. Then, the fixing assembly formed by the heating roller and the pressing roller is inserted, and the toner particles are melted into the fibers of the recording medium under the action of heat and pressure, so that the visible image formed by the carbon powder is completely solidified on the recording medium, that is, the basic is completed. Imaging action.

The Chinese Patent Publication No. CN101382758B discloses a process cartridge including a developing roller having a circumferential surface roller body, the developing roller being rotatably supported on the casing; the sealing members are respectively disposed to face the roller body The circumferential surface is located at both ends of the axial direction and is in pressure contact with the roller body. Each of the sealing members includes a base material formed of an elastic member, and a sliding friction member formed of fibers and in contact with a circumferential surface of the roller body such that the roller body frictionally slides on the sliding friction members.

The casing of the prior art processing cartridge has a pair of end walls, and the developing roller is rotatably supported between the end walls; the elongated elastic sealing member is disposed close to the circumferential surface of the end portion of the roller body of the developing roller, and is rotated at the roller body When the two are in sliding contact, the elastic sealing member is adhered to the casing; one end of the sealing blade is glued to the sponge strip by double-sided tape, and then the sponge strip is bonded to the casing in the axial direction, or directly on both sides The glue is bonded to the casing in the axial direction; the other end of the sealing blade is a free end, and the edge of the free end is in line contact with the surface of the roller body of the developing roller in the axial direction and is relatively slidable. Both ends of the roller body are respectively clamped to the both sides of the free end of the sealing blade with the head of the elastic sealing member.

When the temperature of the environment in which the process cartridge is placed changes, the sealing blade is bonded to the casing by double-sided tape, and at the same time, it can compensate for the slight dimensional change caused by the inconsistent thermal expansion and contraction deformation of various parts.

See Figure 1 One end of the sealing blade 1 is bonded to the casing 2 of the process cartridge in the axial direction by the double-sided tape 7, and both sides of the free end 12 are respectively overlapped with the head 32 of the elastic sealing member 3.

Referring to Fig. 2, both sides of the free end 12 of the sealing blade completely cover the head 32 of the elastic sealing member 3, and the first width of the free end 12 of the sealing blade is axially clamped. 11 is equal to the second width 31 of the head 32 of the elastic sealing member overlapping the roller body of the developing roller 4 in the axial direction, that is, the head 32 of the elastic sealing member together with the developing roller 4 will seal both sides of the free end 12 of the blade Clamp separately.

Since one end of the sealing blade is bonded to the casing by a sponge or directly bonded to the casing by a double-sided tape, the middle portion of the free end is in cantilever contact with the roller body, and both sides of the free end thereof The two ends of the roller body are respectively clamped with the head of the elastic sealing member, so that both sides of the free end are supported by the sliding friction force from the roller body, and the intermediate portion of the free end is suspended from the sliding friction force from the roller body. There is sometimes an imbalance, because the force of the developing roller on both ends of the sealing blade acts completely on both sides of the free end, and the middle portion of the free end can be compressed by the elastic deformation of the sealing blade itself or by the sponge or the double-sided tape. The sliding friction of the part is weakened, and it is obvious that the frictional force acting on both sides of the free end is greater than the frictional force acting on the middle portion of the free end. This imbalance of force easily causes the both ends of the sealing blade 1 to be coated by the developing roller. Pull-up, and bulging in the middle of the axial direction, causing toner leakage failure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a process cartridge in which the end portion of the seal blade is not easily pulled off by the developing roller.

The technical solution adopted by the process cartridge of the present invention is: a casing; a developing roller, the developing roller is rotatably supported in the casing; and a sealing blade, one end of the sealing blade is bonded to the casing, and the opposite end is a free end, the edge of the free end is in line contact with the roller body in the axial direction of the developing roller and is slidable relative to each other; an elastic sealing member which is disposed at both ends of the roller body of the developing roller and which is opposed to the circumferential surface of the roller body In sliding contact, the elastic sealing member is adhered to the casing, and both sides of the free end of the sealing blade are respectively clamped by the two ends of the roller body and the head of the elastic sealing member; the two sides of the free end of the sealing blade are axially clamped. The first width is respectively smaller than the second width of the head of the elastic sealing member in the axial direction.

As a preferred technical solution to the above technical solution, the first width is equal to one-half of the second width. This width value satisfies the sealing requirement, and the force of the developing roller acting on the portion where the sealing blade is clamped is closer to the force of the developing roller acting on the intermediate portion of the sealing blade, thereby preventing the ability of the intermediate ridge to be pulled up. Stronger.

As a specific embodiment of the above technical solution, the elastic sealing member is a felt strip, the felt has a good sealing property to the carbon powder, and the elasticity is moderate when the force of the developing roller is unloaded.

As a preferred embodiment of the above technical solution, the sealing blade is composed of a sheet-like PET plastic. The rigid material sealing blade makes itself stiff, and the free end of the sealing material is more tightly contacted with the developing roller, and is partially trapped in the elastic sealing member in the thickness direction to achieve the desired unloading effect. The object of the invention.

The process cartridge of the invention can effectively avoid the phenomenon that the two sides of the free end of the sealing blade are pulled off in the axial direction and cause the intermediate bulging, thereby eliminating the hidden trouble of generating powder leakage.

1 is a schematic structural view of a conventional process cartridge after removing a waste toner box and a developing roller;

2 is a schematic view showing the position of the two ends of the sealing blade in the conventional process cartridge overlapping with the elastic sealing member and in the axial direction of the developing roller;

Figure 3 is a front elevational view of the process cartridge of the present invention;

Figure 4 is a perspective view of the process cartridge of the present invention after removing the waste toner box assembly;

Figure 5 is a front elevational view of the process cartridge of the present invention with the waste toner box assembly removed;

Figure 6 is a partial enlarged view of a portion B of Figure 5;

Figure 7 is a cross-sectional view taken along line A-A of Figure 5;

Figure 8 is a partial enlarged view of a portion C of Figure 7;

Figure 9 is a partial enlarged view of a portion C of another embodiment of Figure 7;

Figure 10 is a schematic view showing the structure of Figure 5 after the developing roller is removed;

Figure 11 is a schematic view showing the position of the two ends of the sealing blade of the present invention overlapping the elastic sealing member and the axial direction of the developing roller, respectively.

The invention will now be further described with reference to the drawings and embodiments.

Referring to Fig. 3, the casing 2 of the process cartridge has a pair of end walls 21.

Referring to Fig. 4, a powder discharging blade 5 and a sealing blade 1 are mounted in the casing, and the developing roller 4 is rotatably supported between the pair of end walls 21.

Referring to Fig. 5, the free end 12 of the sealing blade is in line contact with the surface of the roller body 41 of the developing roller 4 in the axial direction, and is relatively slidable.

Referring to Fig. 6, the end of the roller body 41 and the head 32 of the elastic sealing member sandwich the end of the free end 12 of the sealing blade.

Referring to Fig. 7, the elongated elastic sealing member 3 abuts against the circumferential surface of the end portion of the roller main body 41, and when the roller main body 41 rotates, the two are in sliding contact with each other, and the elastic sealing member 3 is adhered to the end wall 21 of the casing. .

Referring to Fig. 8, the sealing blade 1 is adhered to the sponge 6 by a double-sided tape 7, and is bonded to the casing 2, and the roller main body 41 and the head 32 of the elastic sealing member sandwich the free end 12 of the sealing blade. When the temperature of the environment in which the process cartridge is placed changes, the sealing blade 1 can be fixed to the casing by the bonding method of the double-sided tape, and can compensate for the thermal expansion and contraction deformation of various parts. Inconsistent changes in trace size.

Referring to Fig. 9, another way of bonding the sealing blade 1 to the casing 2 is as follows: the sealing blade 1 is directly adhered to the casing 2 by the double-sided tape 7, and the head 32 of the roller body 41 and the elastic sealing member are sealed. The side of the blade free end 12 is clamped.

Referring to Fig. 10, a pair of elastic sealing members 3 are respectively opposed to both sides of the free end 12 of the sealing blade 1.

Referring to Fig. 11, a pair of elastic sealing members 3 are disposed at both ends of the roller main body 41, and the first width 11 in which the side portions of the sealing blade free end 12 are sandwiched in the axial direction is smaller than the head 32 edge of the elastic sealing member 3. The second width 31 of the axial direction. The second width 31 is twice the first width 11.

The sealing blade 1 is made of a hard material such as flaky PET plastic, and the elastic sealing member 3 is a felt strip; after the developing roller 4 is mounted, it is in pressure contact with the sealing blade 1, and the sealing blade 1 is partially trapped in the thickness direction. In the sealing member 3, the sealing effect is achieved, and the force of the developing roller on both ends of the sealing blade 1 can be partially transferred to the elastic sealing member 3, thereby preventing the end portion of the sealing blade 1 from being pulled off by the developing roller. The middle bulge eliminates the hidden danger of powder leakage.

In the above technical solution of the process cartridge of the present invention, the two sides of the free end of the sealing blade respectively cover a part of the elastic sealing member head in the axial direction, and the other part of the head of the elastic sealing member that is not covered continues with the roller body. In the sliding contact, when the developing roller is pressed against the sealing blade, the portion where the sealing blade is clamped is partially trapped in the elastic sealing member in the thickness direction, thereby achieving the sealing effect and the middle portion with the free end. The function of the cantilever type force mode is to unload the force of the developing roller to the both ends of the sealing blade to the portion of the head of the elastic sealing member which is not covered in the axial direction, so that the developing roller acts on the free end of the sealing blade. The forces on both sides are more balanced than the forces acting on the intermediate line contact portion.

Claims

Processing box, including

Box

a developing roller rotatably supported in the casing;

a sealing blade, one end of the sealing blade is bonded to the casing along an axial direction of the developing roller, and the other end opposite to the one end is a free end, and an edge of the free end is axially and developed Line contact between the main bodies of the roller and relative to sliding;

An elastic sealing member which is disposed at both ends of the main body of the developing roller and is in sliding contact with a circumferential surface of the main body, the elastic sealing member being bonded to the casing, the sealing Two sides of the free end of the blade are respectively clamped by the two ends of the body with the head of the elastic sealing member;

It is characterized by:

A first width of the free end of the sealing blade sandwiched in the axial direction is smaller than a second width of the head of the elastic sealing member in the axial direction.
The process cartridge according to claim 1, wherein said first width is equal to one-half of said second width.
A process cartridge according to Claim 1 or 2, wherein said elastic sealing member is a felt strip.
The process cartridge according to claim 1 or 2, wherein the sealing blade is composed of a sheet-like PET plastic.