CN201993583U

CN201993583U - Developing unit with magnetic rubber roller

Info

Publication number: CN201993583U
Application number: CN201120025866XU
Authority: CN
Inventors: 曹国柱
Original assignee: ZHUHAI PRINTMAX IMAGE CO Ltd
Current assignee: Zhongshan Benma Printing Supplies Co., Ltd.
Priority date: 2011-01-26
Filing date: 2011-01-26
Publication date: 2011-09-28
Anticipated expiration: 2021-01-26

Abstract

The utility model discloses a developing unit with a magnetic rubber roller, wherein an aluminum pipe is internally provided with a permanent magnet core, and an elastomer layer made from rubber or plastic and the like is attached outside the aluminum pipe. Therefore, the structure has the respective advantages of both a developing unit with a magnetic roller and a developing unit with a rubber roller. Carbon powder is magnetic carbon powder. Under the action of force of a magnetic field, the carbon powder can be initiatively absorbed on a developing roller without need of a powder supply roller. Meanwhile, the elastomer layer can also form magnetic braids of certain height on a main developing pole, development can be realized in a certain distance even without bias while the elastomer is in soft contact, and the phenomena such as powder accumulation due to the contact of the carbon powder and a photosensitive drum are not caused. In conclusion, the developing unit can not only abate the degree of phenomena such as bottom ash and blackness attenuation occurring to the developing unit with the magnetic roller, but also avoid the defects of the developing unit with the rubber roller such as large torque and tendency to wear. Therefore, the developing unit has the advantages of good printing quality, long service life and low cost.

Description

A kind of developing apparatus of carrying magnetic rubber roll

Technical field

The utility model relates to a kind of developing apparatus, particularly a kind of developing apparatus of carrying magnetic rubber roll.

Background technology

The developer roll of developing apparatus roughly divides two kinds in the existing toner cartridge: magnetic roller and rubber rollers.The magnetic roller is made up of the rotatable magnetic core and the rotating aluminium cover that are loaded in the aluminum pipe, and magnetic core generally divides the 3-5 utmost point, and the table magnetic intensity of every utmost point is difference slightly, generally at 0-1800GS.Magnetic core does not rotate during work, wherein a utmost point as main pole and photosensitive drums over against, because the effect in magnetic field, the magnetic carbon dust can be adsorbed on aluminum tube surfaces, aluminum tube surfaces has one deck coating and certain roughness is arranged, when the carbon dust on the aluminum pipe turns to doctor position and PU film friction, make aluminum tube surfaces adhere to layer of even carbon dust layer, carbon dust is charged owing to rub simultaneously, when aluminum pipe turn to main pole position and photosensitive drums over against the time, carbon dust is at " the magnetic fringe " that form certain altitude under the effect in magnetic field (under the effect of small magnetic conductor at magnetic field force, pile up formed corn cob along magnetic field line), magnetic roller " spacer " then control spacing between magnetic roller surface magnetic fringe and the photosensitive drums, by aluminum tube surfaces being applied an alternating current and a galvanic bias voltage, under the effect of bias voltage, effectively charged toner can be skipped spacing and transfer to the realization development of photosensitive drums sub-image district.

A kind of to the back, rubber rollers is adhered to certain thickness elastic body outward and is formed by an iron core, and bigger volume resistance is arranged.With the Samsung is example, during work, non magnetic carbon dust can be transferred on the rubber rollers under the powder feeding roller effect that certain resistance is arranged of porous, for helping the transfer of carbon dust, apply the voltage of one-500V on the powder feeding roller, apply the voltage of one-300V on the rubber, because the effect of potential difference (PD) more helps the transfer of carbon dust.When rubber rollers turned to doctor position, carbon dust and sheet metal friction made electric charge enough on the carbon dust band, because rubber rollers directly contacts with photosensitive drums, effectively carbon dust can directly be transferred to the sub-image district on the photosensitive drums, thereby finishes development.

To first kind of visualization way, because magnetic roller outside is an aluminum pipe, the cutter of powder delivery simultaneously film generally all is rubber materials such as employing PU class, but film is generally low than sheet metal pressure, the magnetic field force induced effect of carbon dust simultaneously is adsorbed on aluminum tube surfaces in a large number, therefore through behind the powder delivery cutter, obviously a kind of visualization way in back is thick for the carbon dust of aluminum tube surfaces, and carbon dust layer and photosensitive drums have certain spacing, and for guaranteeing carbon dust smoothly by not producing accumulated powder, spacing generally is not less than 0.2mm, and the rubber material is much lower than the frictional electrification of metal material and carbon dust, therefore, generally need apply a bigger bias voltage to aluminum pipe could realize developing.Even if like this, because the carbon dust frictional electrification is lower, also cause bottom ash (whole background color occurring above the print paper of white background is black or grey) easily, blackness decay phenomenons such as (color of print What can be thin out by deceiving gradually on the printer paper).

To a kind of visualization way in back, owing to adopted rubber rollers, so powder delivery cutter available metal material, also can directly contact simultaneously with photosensitive drums, print quality might as well.But owing to do not possess magnetic field force, therefore need the extra powder feeding roller device that increases, simultaneously because carbon dust can not form the magnetic fringe of certain altitude, can not compensate inadequately the developer roll precision, therefore very high to the accuracy requirement of developer roll, cause cost very high, directly contact with photosensitive drums with powder feeding roller owing to rubber rollers on the other hand, shortcomings such as therefore moment of torsion is very big, and is easy to wear.

Summary of the invention

In order to overcome the deficiencies in the prior art, the utility model provides a kind of degree that can alleviate bottom ash and blackness decay, and moment of torsion is little, long service life, the developing apparatus of the carrying magnetic rubber roll that cost is low.

The technical scheme that its technical matters that solves the utility model adopts is:

The developing apparatus of carrying magnetic rubber roll, comprise the photosensitive drums and the developer roll that are arranged in the toner cartridge, it is characterized in that: described developer roll comprises aluminum pipe and is arranged at movable in the aluminum pipe and can adsorbs the permanent magnet magnetic core of magnetic carbon dust that this aluminum pipe is attached with elastomer layer outward.

Described elastomer layer can be made of rubber or plastic cement.

Described elastomer layer surface attachment has coating.

Spacing between described elastomer layer and the photosensitive drums is 0-0.4mm.

The beneficial effects of the utility model are: the utility model is provided with the permanent magnet magnetic core in aluminum pipe, aluminum pipe is attached with the elastomer layer that materials such as one deck rubber or plastic cement are made outward, therefore this structure has the advantage separately of developing apparatus with the developing apparatus of band rubber rollers of band magnetic roller concurrently, carbon dust has adopted the magnetic carbon dust, because magnetic field force effect, carbon dust can initiatively be adsorbed on the developer roll and not need powder feeding roller, magnetic roller surface can not form " flying powder " yet outside the powder storehouse simultaneously, can make carbon dust carried charge height with the sheet metal friction, guarantee print quality; Elastomer layer is extremely gone up the magnetic fringe that also can form certain height in main the development simultaneously, also can realize in the determining deviation developing even need not be biased in, thereby also can realize developing for certain DC voltage of elastomer layer or bias voltage by adjusting the spacing size certainly.Elastomer layer also can directly contact with photosensitive drums and realize developing, and elastomer layer is soft contact, can not cause carbon dust to contact phenomenons such as forming accumulated powder with photosensitive drums.

In sum, this developing apparatus both can alleviate the degree of phenomenons such as the bottom ash that developing apparatus produced of band magnetic roller and blackness decay, and again not with shortcomings such as the moment of torsion that developing apparatus had of rubber rollers are big, easy to wear, thereby it is good to have embodied print quality, long service life, the advantage that cost is low.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified:

Fig. 1 is a schematic cross-section of the present utility model.

Embodiment

With reference to Fig. 1, the utility model discloses a kind of developing apparatus of carrying magnetic rubber roll, comprise the aluminum pipe 1 that is arranged in the toner cartridge, be arranged at movable in the aluminum pipe 1 and can adsorb the permanent magnet magnetic core 2 of magnetic carbon dust and be attached to the outer elastomer layer 3 of aluminum pipe 1.

In present embodiment, be installed on the magnetic core in the aluminum pipe 1, its magnetic pole 3-5 extremely in, each magnetic pole table magnetic intensity is at 0-2000 GS.And the elastomer layer in the present embodiment 3 can be made of rubber or plastic cement.Elastomeric material can be selected for use: chlorohydrin rubber, urethane rubber, nitrile rubber, silicon rubber etc., plastic material can be selected for use: PVC, EVC, PVA etc., certainly the above-mentioned material of listing only is several common used materials of making in elastomer layer 3 materials, selecting for use of elastomer layer 3 materials is not construed as limiting.Elastomeric hardness is at 0-80HA, and elastomeric material can require certain electric conductivity, and specific insulation is at 0-10 ⁹Ω-Cm.Further, elastic body requires strong, the surface finishing of surface adhesion force at aluminum pipe 1, and elastomer layer 3 surface attachment have coating, to play the protection to elastomer layer.For good development effect is arranged, the spacing between elastomer layer 3 and the photosensitive drums 4 is 0-0.4mm, and when spacing was zero, expression elastomer layer 3 directly contacted with photosensitive drums.

Above-mentionedly just preferred embodiments more of the present utility model are illustrated and describe; but embodiment of the present utility model is not restricted to the described embodiments; as long as it reaches technique effect of the present utility model with essentially identical means, all should belong to protection domain of the present utility model.

Claims

1. the developing apparatus of a carrying magnetic rubber roll, comprise the photosensitive drums and the developer roll that are arranged in the toner cartridge, it is characterized in that: described developer roll comprises aluminum pipe and is arranged at movable in the aluminum pipe and can adsorbs the permanent magnet magnetic core of magnetic carbon dust that this aluminum pipe is attached with elastomer layer outward.

2. the developing apparatus of a kind of carrying magnetic rubber roll according to claim 1 is characterized in that: described elastomer layer can be made of rubber or plastic cement.

3. the developing apparatus of a kind of carrying magnetic rubber roll according to claim 2 is characterized in that: described elastomer layer surface attachment has coating.

4. the developing apparatus of a kind of carrying magnetic rubber roll according to claim 1 is characterized in that: the spacing between described elastomer layer and the photosensitive drums is 0-0.4mm.