CN217879993U

CN217879993U - Processing box

Info

Publication number: CN217879993U
Application number: CN202221162996.2U
Authority: CN
Inventors: 容学宇; 刘金莲
Original assignee: Zhuhai Nastar Information Technology Co ltd
Current assignee: Zhuhai Nastar Information Technology Co ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-11-22
Anticipated expiration: 2032-05-16

Abstract

The utility model discloses a processing box, include: a photosensitive unit including a photosensitive frame and a photosensitive drum rotatably supported on the photosensitive frame; a developing unit including a developing frame and a developing roller rotatably supported on the developing frame, the developing frame being movable between a first position at which the developing roller abuts against the photosensitive drum and a second position; at the second position, the developing roller is separated from the photosensitive drum; and the magnetic part comprises a first magnetic part arranged on the photosensitive frame and a second magnetic part arranged on the developing frame, and a magnetic acting force is formed between the first magnetic part and the second magnetic part so as to force the developing roller to move from the second position to the first position and keep the developing roller at the first position. Compared with the prior art, the utility model discloses realize developing frame and photosensitive frame's mutual reliable connection with the magnetic force of magnetic part, make developing frame and photosensitive frame be difficult for producing in the printing process and beat each other, avoided appearing the condition that the paper printed whitish.

Description

Processing box

Technical Field

The utility model relates to an imaging device technical field, especially a processing box.

Background

An image forming apparatus forms an image on a recording material (such as paper) using an electrophotographic image forming process. Examples of the image forming apparatus include an electrophotographic copying machine, an electrophotographic printer, a facsimile machine, a word processor, and the like. The detachable installs the process cartridge in the imaging device, and the process cartridge includes sensitization unit and development unit, and the sensitization unit includes photosensitive frame and rotatably supports photosensitive drum on the photosensitive frame, and the development unit includes development frame and rotatably supports the developer roll on the development frame.

In an image forming operation, an electrostatic latent image is formed on a photosensitive drum, a developing roller is in contact with the photosensitive drum and is kept under a certain pressure to supply a developer (toner) to the photosensitive drum, develop the electrostatic latent image on the photosensitive drum, and then transfer the developer on the photosensitive drum to a recording material (e.g., paper) to form an image. In non-image forming jobs, such as cleaning of the surface of the photosensitive drum, the developing roller and the photosensitive drum are usually separated.

Processing box among the prior art, when the formation of image operation, the condition of beating each other can appear in development frame and photosensitive frame, leads to the developer roll can't fully contact with the sensitization drum, and the paper is printed whiting, reduces printing quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a processing box to solve the technical problem among the prior art, it can make development frame and photosensitive frame be difficult for producing in the printing process and beat each other.

The utility model provides a processing box, include:

a photosensitive unit including a photosensitive frame and a photosensitive drum rotatably supported on the photosensitive frame;

a developing unit including a developing frame and a developing roller rotatably supported on the developing frame, the developing frame being movable between a first position at which the developing roller abuts against the photosensitive drum and a second position; at the second position, the developing roller is separated from the photosensitive drum;

the magnetic part comprises a first magnetic part arranged on the photosensitive frame and a second magnetic part arranged on the developing frame, and a magnetic acting force is formed between the first magnetic part and the second magnetic part so as to force the developing roller to move from the second position to the first position and keep at the first position.

The process cartridge as described above, wherein preferably, the magnetic member is a permanent magnet.

In the above process cartridge, it is preferable that the photosensitive frame is provided with a rotation fulcrum portion, the developing frame is rotated with the rotation fulcrum portion as a fulcrum, the first position and the second position are both formed on a rotation path of the developing frame, and the first magnetic member and the second magnetic member are movable toward and away from each other as the developing frame rotates.

In the above process cartridge, it is preferable that the developing roller and the second magnetic member are disposed at opposite ends of the fulcrum, the first magnetic member and the second magnetic member are disposed opposite to each other, and a repulsive magnetic force is formed between the first magnetic member and the second magnetic member.

A process cartridge as described above, wherein preferably said first magnetic member and said second magnetic member each comprise a first portion and a second portion, said first portion and said second portion being symmetrically disposed, said first portion and said second portion being of opposite polarity.

In the above process cartridge, preferably, the photosensitive frame is provided with a first recess, the first magnetic member is accommodated in the first recess, the developing frame is provided with a second recess, and the second magnetic member is accommodated in the second recess.

In the above process cartridge, it is preferable that a projection is formed on each of end surfaces of the first magnetic member and the second magnetic member.

A process cartridge as described above, wherein preferably said projection is formed at an intersection of said first part and said second part.

A process cartridge as described above, wherein preferably said first magnetic member and said second magnetic member are each of a regular polyhedron structure.

A process cartridge as described above, wherein preferably, said magnetic members are provided in at least two pairs, each pair being symmetrically provided at opposite ends of said process cartridge in a direction perpendicular to an axial direction of said developing roller.

Compared with the prior art, the utility model discloses realize developing frame and photosensitive frame's mutual reliable connection with the magnetic force of magnetic part, the magnetic force ageing of magnetic part is lasting and stability is strong, makes developing frame and photosensitive frame be difficult for producing in the printing process and beats each other, has avoided appearing the condition that the paper printed whitish, has guaranteed printing quality.

Drawings

Fig. 1 is an isometric view of the overall construction of a process cartridge of the present application having a first configuration of magnetic members;

FIG. 2 is a front view of the overall structure of the process cartridge of the present application having a first structure magnetic member;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged schematic view of FIG. 3 at B;

FIG. 5 is an isometric view of a first configuration magnetic member of the present application;

fig. 6 is an isometric view of the overall construction of a process cartridge of the present application having a second construction of magnetic members;

FIG. 7 is a front view of the overall structure of the process cartridge of the present application having a magnetic member of a second structure;

FIG. 8 is a sectional view taken along line C-C of FIG. 7;

FIG. 9 is an enlarged schematic view of FIG. 8 at D;

fig. 10 is an isometric view of a second configuration of a magnetic member of the present application.

Description of reference numerals: 1-process cartridge, 2-photosensitive frame, 3-photosensitive drum, 4-developing frame, 5-developing roller, 6-first magnetic member, 7-second magnetic member, 8-first portion, 9-second portion, 10-first recess, 11-second recess, 12-projection, 13-rotation fulcrum portion.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the related art image forming apparatus, it is common to have a process cartridge including a photosensitive unit and a developing unit, the photosensitive unit and the developing unit may be integrally configured to be detachably mounted to the process cartridge in the image forming apparatus or may be relatively independently mounted together, a frame including the photosensitive unit in the process cartridge is a photosensitive frame, and a frame including the developing unit is a developing frame.

In the related art, the developing unit is held in contact toward the photosensitive unit by using a spring (a pressing spring or a tension spring) so that the process cartridge performs an image forming operation.

The applicant finds that due to the fact that the space inside the developing frame and the photosensitive frame is limited, the size of the spring is limited, and then the elasticity of the spring is insufficient, the stability that the developing frame and the photosensitive frame are close to each other is reduced, the developing frame and the photosensitive frame cannot be reliably close to each other due to the fact that the elasticity of the spring is insufficient in the printing process, the technical problems that the developing unit and the photosensitive unit jump to each other due to unstable connection, paper printing is whitish occur, and therefore the printing quality cannot be guaranteed are caused.

To solve the above technical problem, an embodiment of the present application provides a process cartridge 1 including a photosensitive unit and a developing unit, as shown in fig. 1 to 10, wherein:

the photosensitive unit includes photosensitive frame 2 and photosensitive drum 3 rotatably supported on photosensitive frame 2, and in the embodiment of the present application, the corresponding structure of the photosensitive unit can refer to the existing content in the prior art, which is not described herein any more.

The developing unit includes a developing frame 4 and a developing roller 5 rotatably supported on the developing frame 4, and in the embodiment of the present application, the corresponding structure of the developing unit can refer to the existing content in the prior art, which is not described herein again.

The developing frame 4 is movable between a first position where, as shown in fig. 3, the process cartridge 1 performs an image forming operation, the developing roller 5 abuts against the photosensitive drum 3, and the developer charged by friction is transferred onto the photosensitive drum 3 by the action of the developing dc bias and the electric field force of the electrostatic latent image of the photosensitive drum 3 to form a visible image; at the second position, where the process cartridge 1 is in a non-image forming operation state, the developing roller 5 is separated from the photosensitive drum 3, and the surface of the photosensitive drum 3 can be cleaned.

In order to realize the contact between the developing roller 5 and the photosensitive drum 3, the process cartridge 1 provided in the embodiment of the present application is provided therein with a magnetic member, the magnetic member includes a first magnetic member 6 disposed on the photosensitive frame 2 and a second magnetic member 7 disposed on the developing frame 4, and a magnetic acting force is formed between the first magnetic member 6 and the second magnetic member 7 to force the developing roller 5 to move from the second position to the first position and to be maintained at the first position. The magnetic acting force can be the mutual attraction force between the first magnetic part 6 and the second magnetic part 7, and also can be the mutual repulsion force between the first magnetic part 6 and the second magnetic part 7, as long as the developing roller 5 can be detachably attached to the photosensitive drum 3, the first magnetic part 6 and the second magnetic part 7 occupy smaller space relative to the spring, the limited degree of the size of the first magnetic part to the limited space between the developing frame 4 and the photosensitive frame 2 is greatly smaller than that of the spring in the prior art, and the magnetic acting force is more durable and more stable than the spring elastic force, so that the developing frame 4 and the photosensitive frame 2 are not easy to generate mutual jumping in the printing process, the condition that paper is printed to be whitish is avoided, and the printing quality is ensured.

In an alternative embodiment, the shape and structure of the first magnetic member 6 are preferably the same as those of the second magnetic member 7 to form a uniform and stable magnetic force, so that the developing frame 4 can be moved reliably and smoothly, and the pressure between the photosensitive drum 3 and the developing roller 5 is prevented from being locally too large or too small.

In the embodiment that this application provided, the magnetic part is the permanent magnet, and it can keep its unanimous magnetic field intensity for a long time under general condition to improve reliable and stable magnetic force, and need not other energy supply parts and can move, simple to operate, and can remove each position installation at will, install in being adapted to the finite space. Those skilled in the art can know that the magnetic member can also be an electromagnet, the electromagnet operates based on electric power, and when the current is switched on, a magnetic acting force is generated, so that the developing roller 5 is attached to the photosensitive drum 3, and when the current is switched off, the magnetic acting force disappears, the developing roller 5 can be separated from the photosensitive drum 3, and meanwhile, the magnetic acting force can be controlled by adjusting the current, so that the pressure between the photosensitive drum 3 and the developing roller 5 is prevented from being too large or too small.

Referring to fig. 3 and 8, the photosensitive frame 2 is provided with a rotation fulcrum portion 13, and the developing frame 4 rotates with the rotation fulcrum portion 13 as a fulcrum, in a possible embodiment, the rotation fulcrum portion 13 is a circular shaft structure, a circular hole matched with the circular shaft structure is formed in the developing frame 4, and the fulcrum is located on an axis of the circular shaft structure. The first and second positions are formed on the rotation path of the developing frame 4, the first and second positions being located at the start and end of the rotation path, respectively, and the first and second

magnetic members

6 and 7 can be moved closer to or farther from each other as the developing frame 4 rotates.

During an image forming operation, a magnetic acting force generated between the first magnetic member 6 and the second magnetic member 7 pushes the developing frame 4 to rotate around a pivot as a center until the developing frame 4 reaches the first position, the developing roller 5 contacts the surface of the photosensitive drum 3 and provides a continuous and stable pressure, after the image forming operation is completed, a separating mechanism arranged in the process cartridge 1 can receive a separating force of an image forming apparatus to separate the developing roller 5 from the photosensitive drum 3, and the developing frame 4 rotates to return to the second position for a next cycle.

Referring to fig. 3 and 4, in a possible embodiment, the developing roller 5 and the second magnetic member 7 are disposed at opposite ends of a fulcrum, the first magnetic member 6 and the second magnetic member 7 are disposed opposite to each other, the first magnetic member 6 is disposed at a predetermined position of the photosensitive frame 2, and a repulsive magnetic force is formed between the first magnetic member 6 and the second magnetic member 7, that is, the opposite side of the first magnetic member 6 and the second magnetic member 7 has the same polarity, as shown in fig. 1 to 5, the illustrated magnetic members are magnetic members of a first structure, specifically, the first magnetic member 6 is layered up and down, the opposite side of the first magnetic member 7 is N or S pole, and the second magnetic member 7 is layered up and down, and the opposite side of the first magnetic member 6 is also N or S pole, so as to generate a repulsive magnetic force, the magnetic force pushes the second magnetic member 7 to move away from the photosensitive frame 2, while the developing roller 5 is disposed at the fulcrum, so that the developing roller 5 moves toward the photosensitive drum 3, and the developing roller 3 is separated from the photosensitive drum.

Further, referring to fig. 6 to 10, the magnetic member shown in the drawings is a magnetic member of a second structure, specifically, each of the first magnetic member 6 and the second magnetic member 7 includes a first portion 8 and a second portion 9, the first portion 8 and the second portion 9 are symmetrically disposed to facilitate the forming process and provide a uniform magnetic force, the polarities of the first portion 8 and the second portion 9 are opposite, in an initial installation stage, the first magnetic member 6 is deflected relative to the second magnetic member 7, preferably by 90 ° (as shown in fig. 9), so as to reduce the mutual repulsion between the first magnetic member 6 and the second magnetic member 7, so as to facilitate the installation and connection of the developing frame 4 and the photosensitive frame 2, after the development frame 4 and the photosensitive frame 2 are installed and connected, the first magnetic member 6 or the second magnetic member 7 is rotated so that the polarities of the two are opposite, the first portion 8 of the first magnetic member 6 and the first portion 8 of the second magnetic member 7 correspond to each other, and the repulsion between the first portion 8 of the first magnetic member 6 and the second magnetic member 7 corresponds to the second magnetic member 7, such as a mutual repulsion between the second magnetic member 9 and the second magnetic member 7, and the developing frame 6 and the photosensitive frame 2 are connected.

In the embodiment provided by the present application, referring to fig. 4 and 9, a first recess 10 is disposed on the photosensitive frame 2, the first recess 10 is a groove structure, the first magnetic member 6 is accommodated in the first recess 10, the first recess 10 is disposed on a side of the photosensitive frame 2 close to the developing frame 4, an inner contour surface of the first recess 10 matches an outer contour surface of the first magnetic member 6, and preferably, the first magnetic member 6 is in clearance fit in the first recess 10, so that the first magnetic member 6 can rotate and is limited to move in the radial direction and the axial direction.

Referring to fig. 4 and 9, the developing frame 4 is provided with a second recess 11, the second magnetic member 7 is accommodated in the second recess 11, the second recess 11 is disposed on a side of the developing frame 4 away from the photosensitive frame 2, the second recess 11 is a groove structure, the second magnetic member 7 is accommodated in the second recess 11, an inner contour surface of the second recess 11 matches an outer contour surface of the second magnetic member 7, and preferably, the second magnetic member 7 is in clearance fit in the second recess 11, so that the second magnetic member 7 can rotate and is limited to move in the radial direction and the axial direction.

Through the sunken degree of depth of adjusting first depressed part 10 and second depressed part 11, can adjust the distance between first magnetism piece 6 and the second magnetism piece 7 to a certain extent, also adjust the size of magnetic force for developer roll 5 can support with a suitable pressure and press on photoreceptor drum 3, avoids the pressure between photoreceptor drum 3 and developer roll 5 too big or undersize, and the unable reliable transfer of developer influences printing quality.

Further, in order to facilitate the rotation and installation adjustment of the first magnetic member 6 and the second magnetic member 7 by an operator, referring to fig. 10, a protrusion 12 is formed on the end surface of each of the first magnetic member 6 and the second magnetic member 7, and the operator can hold the protrusion 12 to apply force when installing the first magnetic member 6 in the first recess 10 and installing the second magnetic member 7 in the second recess 11 or rotating the first magnetic member 6 and the second magnetic member 7.

Further, as shown in fig. 10, the protrusion 12 is formed at the intersection of the first portion 8 and the second portion 9, that is, the protrusion 12 is disposed in the center, and may also serve as a boundary mark, and during the rotation of the first magnetic member 6 or the second magnetic member 7, the boundary mark serves as a mark, as shown in fig. 4, for example, when the first magnetic member 6 and the second magnetic member 7 are misaligned by 90 °, the projections 12 on the first magnetic member 6 and the projections 12 on the second magnetic member 7 in the gravity direction may intersect perpendicularly, and when the projections 12 on the first magnetic member 6 and the projections 12 on the second magnetic member 7 in the gravity direction coincide, the first magnetic member 6 and the second magnetic member 7 exactly correspond to each other.

In a possible embodiment, as shown in fig. 5 and 10, the first magnetic element 6 and the second magnetic element 7 are regular polyhedron structures, such as triangular prism, rectangular parallelepiped, cube or cylinder structures, in this embodiment, the first magnetic element 6 and the second magnetic element 7 are cylinder structures, and the first concave portion 10 and the second concave portion 11 are also circular grooves, so that the cylinder structures are divided into the first portion 8 and the second portion 9, and rotation adjustment and assembly are facilitated.

Further, at least two pairs of magnetic members are provided, as shown in fig. 1 and 6, each pair of magnetic members being symmetrically provided at opposite ends of the process cartridge 1 in a direction perpendicular to the axial direction of the developing roller 5, and in the embodiment provided herein, two pairs of magnetic members are provided, and two pairs of magnetic members being symmetrically provided at opposite ends of the process cartridge 1 in a direction perpendicular to the axial direction of the developing roller 5. Those skilled in the art will appreciate that the magnetic members may be provided in more pairs, and the number and distribution thereof may be such that the developing roller 5 is constantly and uniformly subjected to the magnetic force. The magnetic members are preferably even pairs, such as 2,4,6,8, and the like, and are arranged at two ends of the process cartridge 1 in half, each pair of magnetic members includes the first magnetic member 6 arranged on the photosensitive frame 2 and the second magnetic member 7 arranged on the developing frame 4, so that both ends of the developing roller 5 in the axial direction can be subjected to magnetic acting force, and the developing roller 5 can be abutted on the photosensitive drum 3 more stably, thereby improving the printing effect.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A process cartridge characterized by comprising:

2. A process cartridge according to claim 1, wherein: the magnetic part is a permanent magnet.

3. A process cartridge according to claim 2, wherein: the photosensitive frame is provided with a rotation fulcrum part, the developing frame rotates by taking the rotation fulcrum part as a fulcrum, the first position and the second position are formed on a rotation path of the developing frame, and along with the rotation of the developing frame, the first magnetic part and the second magnetic part can be close to or far away from each other.

4. A process cartridge according to claim 3, wherein: the developing roller and the second magnetic part are arranged at two opposite ends of the fulcrum, the first magnetic part and the second magnetic part are oppositely arranged, and mutually exclusive magnetic acting force is formed between the first magnetic part and the second magnetic part.

5. A process cartridge according to claim 4, wherein: the first magnetic part and the second magnetic part respectively comprise a first part and a second part, the first part and the second part are symmetrically arranged, and the polarities of the first part and the second part are opposite.

6. A process cartridge according to claim 5, wherein: the photosensitive frame is provided with a first depressed part, the first magnetic piece is contained in the first depressed part, the developing frame is provided with a second depressed part, and the second magnetic piece is contained in the second depressed part.

7. A process cartridge according to claim 5, wherein: the end surfaces of the first magnetic part and the second magnetic part are respectively provided with a bulge in a protruding mode.

8. A cartridge according to claim 7, wherein: the protrusion is formed at an intersection of the first portion and the second portion.

9. A process cartridge according to claim 1, wherein: the first magnetic part and the second magnetic part are both in a regular polyhedral structure.

10. A process cartridge according to claim 1, wherein: the magnetic members are provided with at least two pairs, and each pair of magnetic members is symmetrically arranged at two opposite ends of the processing box along the direction vertical to the axial direction of the developing roller.