CN216118396U - A magnetic roller and a process cartridge including the same - Google Patents

Abstract

The present invention relates to a magnetic roller and a process cartridge including the same. A magnetic roller comprises a sleeve, a magnetic core and a gap control part positioned at the end part of the magnetic roller, and is characterized in that no gap exists between the inner surface of the gap control part and the outer circumferential surface of the sleeve. The problem that magnetic developer easily enters an annular gap between the inner circumferential surface of a sheath and the outer circumferential surface of a sleeve of a magnetic roller in the developing process of the existing magnetic roller, and therefore the size of a gap formed between the magnetic roller and a photosensitive member of the sheath is unstable is solved. And avoiding the adverse effects of abrasion, corrosion and the like on the sheath and the sleeve of the magnetic roller caused by the long-term existence of the magnetic developer in the gap, thereby ensuring that the processing box assembled with the magnetic roller has excellent service performance and service life.

Description

Magnetic roller and processing box comprising same

Technical Field

The present invention relates to a magnetic roller and a process cartridge including the same.

Background

Process cartridges, which are consumable parts in electronic image forming apparatuses such as laser printers, copiers, and facsimile machines, carry an important role in visually developing electronic images on recording media such as paper. Referring to fig. 1 and 2, a process cartridge 100 includes a powder hopper 101 and a waste powder hopper 102, a rotatable magnet roller 10 is supported laterally on the powder hopper 101, a rotatable photosensitive member 20 is supported laterally on the waste powder hopper 102, and a rotatable charging member 30 for applying a bias voltage to the photosensitive member, the magnet roller 10 and the photosensitive member 20 being rotated relatively after the powder hopper 101 and the waste powder hopper 102 are assembled and positioned. As shown in fig. 2, the magnetic roller 10 includes a fixed magnetic core 11 and a rotatable sleeve 12 axially sleeved on the outer periphery of the magnetic core 11, the sleeve 12 is made of conductive metal material, the outer surface of the sleeve 12 has a certain roughness and a conductive coating structure, and the magnetic roller 10 can maintain a certain gap between the photosensitive member 20 and the sheaths 40 sleeved on both ends of the sleeve 12, and carry the single-component or two-component (containing magnetic carrier) magnetic developer to the outer surface of the sleeve 12 and transmit the developer to the surface of the photosensitive member 20 under the action of the electric field force and the magnetic force of the magnetic core. However, the jacket 40 and the outer circumferential surface of the sleeve 12 of the magnet roller 10 are generally formed with an annular gap into which a certain amount of magnetic developer inevitably enters during printing, the magnetic developer intervenes between the inner circumferential surface of the jacket 40 and the outer circumferential surface of the sleeve 12, and affects the size of a gap formed between the jacket 40 and the photosensitive member 20, if the size of the gap cannot be maintained stably, the amount of the magnetic developer transferred from the magnet roller 10 to the photosensitive member 20 cannot be maintained unstably, and the thickness of the magnetic developer on the photosensitive member 20 participating in development is not uniform, thus directly affecting the quality of a printed image. In addition, the magnetic developer existing in the gap for a long time gradually wears the sheath 40 or the sleeve 12, and if the low-melting-point component in the magnetic developer is subjected to heat generated by friction during the rotation of the sheath 40 and the magnetic roller 10, the low-melting-point component is also subjected to melting deformation and is stuck to the sheath 40 or the sleeve 12 for a long time, and the sheath 40 or the sleeve 12 is also subjected to more or less corrosive damage, which affects the service life of the process cartridge.

SUMMERY OF THE UTILITY MODEL

The utility model provides a magnetic roller, which aims to solve the problem that magnetic developer easily enters an annular gap between the inner circumferential surface of a sheath and the outer circumferential surface of a sleeve of the magnetic roller during the developing process of the existing magnetic roller, so that the size of a gap formed between the magnetic roller and a photosensitive member by the sheath is unstable. And avoiding the adverse effects of abrasion, corrosion and the like on the sheath and the sleeve of the magnetic roller caused by the long-term existence of the magnetic developer in the gap, thereby ensuring that the processing box assembled with the magnetic roller has excellent service performance and service life.

In order to solve the technical problems, the technical scheme adopted by the application is as follows:

a magnetic roller comprises a sleeve, a magnetic core and a gap control part positioned at the end part of the magnetic roller, and is characterized in that no gap exists between the inner surface of the gap control part and the outer circumferential surface of the sleeve.

The gap control part is of an annular structure with a certain thickness on the cross section of the gap control part.

The magnetic roller has a shaft end at the end thereof, and the gap control portion is located at the shaft end.

The shaft end has a plug-in connection which is plugged into the inner circumferential wall at the end of the sleeve.

The gap control part is arranged on the sleeve.

The shaft end is provided with a plug-in part and a flange part.

The application also provides a processing box, which comprises a powder bin, wherein any one of the magnetic rollers is arranged in the powder bin.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic view showing a structure of a process cartridge according to the prior art;

FIG. 2 is a schematic view showing a structure of a powder hopper of a prior art process cartridge;

FIG. 3 is an exploded view of a magnetic roller and a jacket according to the prior art;

FIG. 4 is a schematic structural diagram of a magnetic roller according to an embodiment of the present invention;

FIG. 5 is a cross-sectional exploded view of a magnetic roller according to an embodiment of the present invention;

fig. 6 is a cross-sectional exploded view of a magnetic roller according to a second embodiment of the present invention;

fig. 6a is an enlarged view at E in fig. 6.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example one

The present invention provides a magnetic roller structure which enables the magnetic roller to have more stable electrical performance during the rotation operation in a processing box by improving the electrical conduction structure inside the magnetic roller.

As shown in fig. 4 and 5, the magnetic roller 70 according to the present application, having a conductive end C and a driving end D, includes a magnetic core 71, a sleeve 72, and a gap control portion at an end of the magnetic roller, wherein there is no gap between an inner surface of the gap control portion and an outer circumferential surface of the sleeve. Preferably, the gap control part has a ring structure having a certain thickness in a cross section thereof, and there is no gap between an inner circumferential surface of the gap control part and an outer circumferential surface of the sleeve. Specifically, a first gap control portion 75 is provided at the conductive end C, a second gap control portion 76 is provided at the driving end D, and the first gap control portion 75 and the second gap control portion 76 have a ring-shaped structure with a certain thickness in the respective cross sections, and in this embodiment, shaft ends are further provided at both ends of the magnetic roller 70, respectively, and the gap control portions are located at the shaft ends. The conductive end C of the magnetic roller 70 has a first shaft end 73, the conductive end D of the magnetic roller 70 has a second shaft end 74, and two ends of the magnetic core 71 corresponding to the conductive end C and the driving end D are respectively inserted into the sleeve 72 through the first shaft end 73 and the second shaft end 74, in this embodiment, the first shaft end 73 and the first gap control portion 75 are integrally formed, and the second shaft end 74 and the second gap control portion 76 are integrally formed, which may be die-cast and cut-formed by a metal material, or molded and injection-formed by plastic, and in this embodiment, an injection-formed plastic part is preferred.

According to this embodiment, a plug-in part is provided on the shaft end, which plug-in part is plugged into the inner circumferential wall at the end of the sleeve, in order to fix the shaft end on the sleeve. Specifically, the first shaft end 73 has a first insertion part 731 for insertion into the inner circumferential wall of the sleeve 72 at the conductive end C, and the second shaft end 74 has a second insertion part 741 for insertion into the inner circumferential wall of the sleeve 72 at the conductive end D, the insertion preferably being an interference fit. Taking the first shaft end 73 as an example, the first mating part 731 is a cylindrical structure, the first mating part 731 has a first mating end 732, the first mating end 732 is a free end of the first mating part 731, and a first gap control part 75 is provided on the first mating part 731 on the side opposite to the first mating end 732, so that after the first shaft end 73 is inserted into the inner circumferential wall of the sleeve 72 from the first mating end 732, the first gap control part 75 is used as a flange part to abut against the end surface of the sleeve 72 to position and fix the first shaft end 73 in the axial direction of the magnetic roller rotating shaft, and the first gap control part 75 is successfully provided at the end of the magnetic roller 70. The second shaft end 74 has the same structure as the first shaft end 73, so that the second gap control portion 76 is provided at the other end portion of the magnetic roller 70 in the same manner, which will not be described in detail. At this time, in the radial direction of the sleeve 72, the first gap control part 75 and the second gap control part 76 protrude from the outer surfaces of both ends of the sleeve 72 by a certain height, and the protruding heights of the two gap control parts from the outer surfaces of both ends of the sleeve are set to be equal, so that after the magnetic roller 70 is assembled in the process cartridge, the magnetic roller and the photosensitive member form a gap after abutting against the photosensitive member through the two gap control parts. Effectively ensure the stability of the image quality of printing the in-process, in addition, when wearing and tearing appear because of the material problem in clearance control portion, accomplish in time to change it according to the structure of this embodiment, can realize maintenance work through tearing open the axle head of changing, prolong the life of handling the box.

Example two

As shown in fig. 6, the present embodiment provides a magnetic roller with another structure on the basis of the first embodiment, and the magnetic roller 80 also has a conductive end C and a driving end D, and includes a magnetic core 81, a sleeve 82, and a gap control portion at an end of the magnetic roller, and is different from the first embodiment in that the gap control portion is disposed on the sleeve 82. Specifically, a first gap control portion 85 is provided at the conductive end C, a second gap control portion 86 is provided at the driving end D, and shaft ends are further provided at both ends of the magnetic roller 80: the first and second shaft ends 83, 84, the first and second shaft ends 83, 84 may be provided with a first and second mating part 831, 841 in the same manner as in the first embodiment. In addition, the present embodiment is different from the first embodiment in that a flange portion is directly provided on the insertion portion, the flange portion is located on the side of the insertion portion opposite to the insertion end, the flange portion has the same positioning and fixing function for the insertion portion as the first gap control portion 75 in the first embodiment, in the cutting plane along the axial direction of the magnetic roller rotation shaft as shown in fig. 6a, the flange portion 833 of the present embodiment is a step structure, and is located on the side of the first insertion end 832 (free end) of the first insertion portion 831, and the structure of the second insertion portion 841 is arranged in the same way, so that the first insertion portion 831 and the second insertion portion 841 can be respectively and fixedly clamped at two ends of the sleeve 82. The first gap control part 85 and the second gap control part 86 in this embodiment can be arranged at two ends of the sleeve 80 in an integrated cutting and molding manner with the sleeve 80, that is, the first gap control part 85 and the second gap control part 86 are both of metal structures, which greatly enhances the wear resistance of the gap control parts, and the first gap control part 85 and the second gap control part 86 directly arranged on the sleeve 80 can keep good coaxial condition with the rotating shaft of the sleeve 80, so that the size of the gap between the magnetic roller and the photosensitive member is not easy to change along with the rotation, and the amount of the magnetic developer transmitted between the magnetic roller and the photosensitive member is always kept good stability in the working process.

It is understood that the first shaft end 83 or the second shaft end 84 of the present embodiment may be integrally formed with the sleeve 80, that is, the shaft end of the magnetic roller, the sleeve and the gap control portion may be integrally formed, and only the magnetic core 81 is required to be smoothly installed into the sleeve 80, which also belongs to the inventive concept of the present application.

Further, the present application also provides a process cartridge including the above-described magnetic roller, other structures of which may be the same as those of the process cartridge in the background art, and the process cartridge according to the present application may be used for an image forming apparatus such as a copying machine, a facsimile machine, and a printer.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1. A magnetic roller, comprising a sleeve, a magnetic core, and a gap control portion at the end of the magnetic roller, wherein there is no gap between the inner surface of the gap control portion and the outer circumferential surface of the sleeve. 2 . The magnet roller according to claim 1 , wherein the gap control portion is an annular structure with a certain thickness on its cross section. 3 . 3 . The magnet roller according to claim 1 , wherein a shaft end is provided at an end of the magnet roller, and the gap control portion is located on the shaft end. 4 . 4 . The magnet roller according to claim 3 , wherein the shaft end has a plug-in portion, which is plugged into the inner circumferential wall at the end of the sleeve. 5 . 5 . The magnet roller according to claim 3 , wherein the gap control portion is provided on the sleeve. 6 . 6 . The magnet roller according to claim 5 , wherein the shaft end has a plug portion and a flange portion. 7 . 7. A process cartridge, comprising a powder bin, wherein the powder bin is provided with the magnetic roller according to any one of claims 1 to 6.

Images