CN101452243A - Developing apparatus - Google Patents
Developing apparatus Download PDFInfo
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- CN101452243A CN101452243A CNA2007100323667A CN200710032366A CN101452243A CN 101452243 A CN101452243 A CN 101452243A CN A2007100323667 A CNA2007100323667 A CN A2007100323667A CN 200710032366 A CN200710032366 A CN 200710032366A CN 101452243 A CN101452243 A CN 101452243A
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- developer roll
- feeding roller
- powder feeding
- developing apparatus
- developer
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Abstract
The invention discloses a development device. The line contact pressure between a powder feeding roller and a development roller is between 0.5 and 2g/mm; the cell density of the powder feeding roller surface is less than or equal to 10cells/mm; and the powder feeding roller and the development roller meet the following relational expression: df(V1+V2)/V1 is less than 10, wherein d represents the cell density of the powder feeding roller surface, f represents the line contact pressure between the powder feeding roller and the development roller, V1 represents the rotational line velocity when the development roller works, and V2 represents the rotational line velocity when the powder feeding roller works. The development device can reduce the torque between the powder feeding roller and the development roller to below 0.6Kgf.cm, can reduce the friction loss of the powder feeding roller and the development roller, and can prolong the service life of the development device. In addition, the development device can reduce the driving torque needed by the development device, alleviate the driving load pressure of an imaging device, and prolong the service life of the imaging device.
Description
Technical field
The present invention relates to a kind of developing apparatus that is applied in the laser class imaging device.
Background technology
In laser class imaging device, for example laser printer, laser copier or facsimile recorder etc. all are provided with the developing apparatus that the electrostatic latent image that is formed on the photosensitive drums is developed.Present developing apparatus generally includes: be used for the box body of receiving photographic developer, be provided with puddle support in it; Rotatably be supported in developer roll and powder feeding roller on the box body; Be used to control the powder delivery cutter of developer layer thickness on the developer roll, comprise knife rest and the blade that is fixed on the knife rest, this blade has the free end that forms Elastic Contact with described developer roll.Wherein, developer roll is made up of a steel axle and the rubber layer that is looped around on the steel axle, and this rubber layer can produce certain elastic deformation; Powder feeding roller is made up of a steel axle and the foam sponge layer that is looped around on the steel axle, and this foam sponge layer can be compressed.
The groundwork principle of above-mentioned laser class imaging device is: at first, image of printing or duplicating waiting or literal form electrostatic latent image on the surface of photosensitive drums; Then, to the agent of developer roll supplying developing, and then utilize developer that the electrostatic latent image on the photosensitive drums is developed by developer roll again, promptly on photosensitive drums, have the zone of image or literal to fill uniform developer by powder feeding roller; At last, image that this developer is filled or words transfer printing pass through photographic fixing again, thereby obtain image or literal to medium.In above-mentioned developing process, the developer particulate that has faint electric weight is under the effect of electric field force, and the outside surface of autography roller moves to the electrostatic latent image zone on the photosensitive drums.The developer particulate will directly influence the picture quality of filling with developer on the photosensitive drums in the thickness and the uniformity coefficient on developer roll surface, and its net result will directly influence to be printed or copying quality.The powder delivery cutter is regulated the developer layer thickness that is adsorbed on the developer roll, meanwhile, utilizes the friction between powder delivery cutter and developer, makes the certain electric charge of developer band.Under the double action in change of developer roll electromotive force and the formed magnetic field of developer roll, the developer particulate forms at the developer roll outside surface has certain thickness uniform developer layer.
In above-mentioned developing apparatus, the free end of powder delivery cutter is parallel to the developer roll axis and extends along the developing regional of its external cylindrical surface at developer roll, the external cylindrical surface of this free end and developer roll keeps Elastic Contact, and this elasticity is provided by the material and the shape structure of powder delivery cutter itself.Assembling powder delivery cutter makes before its location, the magnitude of interference that must keep appropriateness between the external cylindrical surface of its free end and developer roll, after the powder delivery cutter location, the external cylindrical surface of powder delivery cutter free end contact developer roll, this magnitude of interference forces powder delivery cutter blade generation elastic deformation, and then obtain suitable elastic force, make between the external cylindrical surface of powder delivery cutter free end and developer roll and form Elastic Contact.In the prior art, keeping the powder delivery cutter free end of Elastic Contact to have comparatively sharp keen cutting edge with the developer roll surface, make free end and developer roll surface contact area very little, almost is the line contact.Since the powder delivery cutter prerequisite elasticity determined it to have bigger hardness, developing apparatus its developer roll surface in long-term use will be subjected to the long-time friction of powder delivery cutter, cause the developer roll surface progressively to produce cut, cause developer roll surface development agent deposition inhomogeneous, or the white space that the Nonvisualization agent is adsorbed occurs, and then have a strong impact on printing effect.
In the installing mechanism of above-mentioned developing apparatus, puddle support, powder feeding roller and developer roll are usually in the layout that axially is parallel to each other, in the use of developing apparatus, in the above-mentioned revolving part one is subjected to the driving of laser class imaging device and carries out work, and the moment of torsion that resistance forms all has bigger influence to print quality, developing apparatus life-span, service life of a machine, the moment of torsion of resistance be mainly derived between powder feeding roller and the developer roll and developer roll and powder delivery cutter between.And the resistive torque that produces between powder feeding roller and the developer roll mainly is subjected to the combined influence of factors such as decrement of cavernous body hardness, powder feeding roller cavernous body and developer roll of hardness, surfaceness, process of surface treatment, the powder feeding roller of developer roll.
Because developer roll and powder feeding roller, powder delivery cutter all keep the Elastic Contact relation, promptly, rubber layer and foam sponge layer can produce certain decrement, therefore when developer roll is in the duty of rotation, all have certain friction force between developer roll and powder feeding roller and the powder delivery cutter, friction can make developer roll produce certain wearing and tearing for a long time.If powder feeding roller, improper or the process of the selection of developer roll and powder delivery cutter exceeds certain error range, the decrement of the rubber layer on the developer roll may exceed predetermined decrement so, make the friction force between developer roll and powder feeding roller and the powder delivery cutter enlarge markedly, especially the force of sliding friction between powder delivery cutter and the developer roll sharply increases, the wearing and tearing meeting of developer roll is more serious, the input torque of developing apparatus also will increase simultaneously, easily cause the distortion of driving members such as gear, make developing apparatus not work normally, even can influence the serviceable life of laser class imaging devices such as printer.
Simultaneously, the visual situation of the electrostatic latent image on the photosensitive drum surface, promptly the developer image is subjected to the supply of developer in the developing regional and the influence of electrical characteristics.The situation on the supply of the interior developer of developing regional and electrical characteristics are sticked to developer roll by developer the outer circumference surface or the situation that forms of developer layer are determined.The formation situation of the developer layer on the outer circumference surface of developer roll is mainly by the state decision of powder delivery cutter against the outer circumference surface of developer roll.Thereby the developer image on the photosensitive drum surface is subjected to the influence of powder delivery cutter against the state of the outer circumference surface of developer roll.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of developing apparatus that reduces required driving torque;
Further aim of the present invention is to provide a kind of developing apparatus that reduces the powder delivery cutter to the scraping and the wearing and tearing of developer roll.
For realizing above-mentioned fundamental purpose, the present invention has adopted following technical scheme: design a kind of developing apparatus, comprising: the box body that is used for receiving photographic developer; Rotatably be supported in developer roll and powder feeding roller on the box body, form extruding between described developer roll and the powder feeding roller and contact; Be used to control the powder delivery cutter of developer layer thickness on the developer roll, this powder delivery cutter has the free end that forms Elastic Contact with described developer roll; Wherein, the line contact pressure between described powder feeding roller and the developer roll is between 0.5～2g/mm, and the cell density of powder feeding roller surface portion is not more than 10cells/mm, and satisfies following relational expression between powder feeding roller and the developer roll:
df(V1+V2)/V1<10；
Wherein, d represents the cell density of powder feeding roller surface portion, and unit is cells/mm; F represents the line contact pressure between powder feeding roller and the developer roll, and unit is g/mm, the rotational line speed when V1 represents developer roll work, and unit is mm/sec, the rotational line speed when V2 represents powder feeding roller work, unit is mm/sec.
Preferably, the line contact pressure between described powder feeding roller and the developer roll is between 1.5～2g/mm; The cell density of described powder feeding roller surface portion is between 1～5cells/mm.
Described powder feeding roller surface portion is the sponge that polyester or polyethers material are made.
For realizing further aim of the present invention, the free end of described powder delivery cutter comprises a contact site and an extension; Described contact site is first arc section on xsect, its radius-of-curvature is between 0.2mm～1mm.Be designed to circular shape by the free end that powder delivery cutter and developer roll are come in contact, the curved surface way of contact is changed in the line way of contact between the two, both are improved largely at the contact smoothness properties of contact area.Like this, can reduce on the one hand because the scraping that the line contact causes, the free end of this circular shape can rely on the elastic deformation of the stressed generation of circular arc on the other hand, applies stable and contacts elastic force reliably to developer roll.
Described extension can be second arc section on xsect, its radius-of-curvature is more than or equal to the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
In addition, described extension also can be on xsect section linearly, this straight-line segment and described first arc section are tangent or crossing.
The public string of described contact site and developer roll with described contact site and the tangent line of extension junction between the angular range that forms be 20 °～60 °, more excellent angular range is 40 °～50 °.
The present invention is by the line contact pressure between control powder feeding roller and the developer roll and the cell density of powder feeding roller surface portion, and satisfy certain relation between powder feeding roller and the developer roll, make the moment of torsion between powder feeding roller and the developer roll can be reduced to below the 0.6Kgfcm, and the frictional dissipation of powder feeding roller and developer roll is reduced, prolong the life-span of developing apparatus, can reduce the required driving torque of developing apparatus on the other hand, alleviate the driving load pressure of imaging device, improve the serviceable life of imaging device.
Description of drawings
Fig. 1 is the cut-open view of a kind of preferred implementation of the present invention;
Fig. 2 is the skeleton view of the cutter of powder delivery shown in Fig. 1;
Fig. 3 is the cross-sectional view of powder delivery cutter shown in Figure 2;
Fig. 4 is the local amplification view of the free end of powder delivery cutter shown in Figure 3 when contacting with developer roll.
Below in conjunction with accompanying drawing and preferred implementation the present invention is done to describe in further detail.
Embodiment
Fig. 1 is to a kind of preferred implementation of the present invention shown in Figure 4, and developing apparatus 1 comprises: have the box body 3 in developer-accommodating storehouse 2, this holds and is provided with puddle support 4 in the storehouse 2, is used for developer is stirred; Developer roll 5 and powder feeding roller 6 rotatably are supported on the box body 3, form extruding between developer roll 5 and the powder feeding roller 6 and contact.Wherein, developer roll 5 is made up of a steel axle and the rubber layer that is looped around on the steel axle, and this rubber layer can produce certain elastic deformation; Powder feeding roller 6 is by a steel axle and is looped around the spongy layer of being made by polyester or polyethers material on the steel axle that this spongy layer can be compressed.The end of developer roll 5 and bottom are provided with seal 10, and seal 10 forms extruding with developer roll 5 side faces and contacts, thereby prevent that the developer in the box body 3 from leaking from the end and the bottom of developer roll 5.
Referring to Fig. 1, when developing apparatus 1 work, backplate before the developer roll 57 is removed, made the part of developer roll 5 side faces relative with photosensitive drums (not shown) surface, the circumferential surface of developer roll 5 and powder feeding roller 6 rotates with specific linear velocity along the direction of arrow shown in Figure 1 respectively.Powder feeding roller 6 can be given developer roll 5 with developer feeding on the one hand, and the residual carbon dust in back that developer roll 5 can be developed on the other hand scrapes; Developer roll 5 so with developer feeding to photosensitive drum surface, thereby the electrostatic latent image on the photosensitive drums is become visual developer image, electrostatic latent image by the exposure assembly laser radiation is formed by photoconductive effect at photosensitive drum surface; Along with the rotation of photosensitive drums, the developer image that is supported on the photosensitive drum surface is transferred on the recording medium by unshowned transfer roll.
In order to reduce the required driving torque of developing apparatus 1, need the line contact pressure f between control powder feeding roller 6 and the developer roll 5 on the one hand, make line contact pressure f between 0.5～2g/ ware, comparatively desirable scope is 1.5～2g/mm, if line contact pressure f is too big, can increase the frictional resistance between powder feeding roller 6 and the developer roll 5, and then increase the required driving torque of developing apparatus 1, if and line contact pressure f is too little, then powder feeding roller 6 can't be given developer feeding developer roll 5 effectively and the residual carbon dust in developer roll 5 development backs is scraped; On the other hand, the cell density d of the surperficial sponge part of powder feeding roller 6 should be not more than 10cells/mm (the foam hole quantity that forms on every millimeter unit length), if this cell density d too conference increases line contact pressure between powder feeding roller 6 and the developer roll 5, comparatively desirable scope is between 1～5cells/mm.And, should satisfy following relational expression between powder feeding roller 6 and the developer roll 5:
df(V1+V2)/V1<10
Wherein, d represents the cell density of powder feeding roller 6 surperficial sponge parts, and unit is cells/mm; F represents the line contact pressure between powder feeding roller 6 and the developer roll 5, and unit is the g/ ware, the rotational line speed when V1 represents the work of developer roll 5 circumferential surfaces, and unit is mm/sec, the rotational line speed when V2 represents the work of powder feeding roller 6 circumferential surfaces, unit is mm/sec.
Referring to Fig. 1 to Fig. 4, developer roll 5 tops are provided with the powder delivery cutter 8 that is used to control developer layer thickness on the developer roll 5, and this powder delivery cutter 8 comprises knife rest 81 and the blade 82 that is fixed on the knife rest 81, and knife rest 81 is fixed on the box body 3 by screw 84.Blade 82 is made by stalloy, and it has the free end 83 that forms Elastic Contact with developer roll 5 side faces, and this free end 83 extends to upstream one side of developer roll 5 sense of rotation.Blade 82 passes through the part of free end 83 with predetermined pressure extrusion developer roll 5 side faces, and developer is remained on therebetween, and the developer layer of predetermined thickness is formed on the side face of developer roll 5.
Referring to Fig. 4, the free end 83 of blade 82 comprises the contact site 831 of a circular shape and the extension 832 of a circular shape, contact site 831 forms certain contact area with developer roll 5 side faces, forms developer entrance space 9 between extension 832 and developer roll 5 side faces; Contact site 831 and extension 832 are rendered as first arc section and second arc section respectively on their xsect.1 pair of developer roll 5 of the radius of curvature R of first arc section has very important influence, under the certain prerequisite of the line contact pressure maintenance of blade 82 and developer roll 5, if this radius of curvature R 1 is too little, the contact area of contact site 831 and developer roll 5 will be very little, and contact stress is just very big, causes the wearing and tearing of developer roll 5 side faces easily; And if this radius of curvature R 1 is too big, blade 82 just can't effectively be controlled the developer layer thickness on the developer roll 5.Therefore, this radius of curvature R 1 should be controlled between 0.2mm～1mm, and even more ideal radius-of-curvature is 0.4mm～0.6mm.Select the radius of curvature R 1 of above-mentioned numerical range, make the blade 82 of powder delivery cutter can effectively control developer layer thickness on the developer roll 5, can reduce scraping and wearing and tearing again as much as possible developer roll 5 side faces.Above-mentioned free end 831 is owing to be designed to circular shape, so can form curved surface between blade 82 and the developer roll 5 and contact, and both are improved largely at the contact smoothness properties of contact area.Like this, can reduce on the one hand the scraping of 82 pairs of developer roll 5 side faces of blade, the free end 83 of this circular shape can rely on the elastic deformation of the stressed generation of circular arc on the other hand, applies stable and contacts elastic force reliably to developer roll 5.The radius of curvature R 2 of second arc section that the extension 832 that is connected with contact site 831 one presents on xsect is greater than the radius of curvature R 1 of first arc section, and the public string L1 of contact site 831 and developer roll 5 is with forming angle α between the common tangent L2 of contact site 831 and extension 832, and first arc section and second arc section are positioned at the same side of their common tangent L2.In developing apparatus, the developer particle layer that is sent on developer roll 5 side faces passes contact area between developer roll 5 and the blade 82 owing to the conveying capacity that is subjected to origin autography roller 5 with from the shear stress that the adjustment power of blade 82 is produced.Above-mentioned angle α is excessive or too smallly all can cause having some setbacks of powder feeding, and the too small developer that causes easily of angle α stops up, and makes the developer can't be smoothly by the contact area between developer roll and the blade; Angle α is excessive then can't to form enough funneling effects, developer is flowed away from blade next door easily and does not have enough developers to flow into contact area between developer roll and the blade.Therefore, the angular range of angle α is controlled at 20 °～60 °, even more ideal angular range is 40 °～50 °, at this moment can obtain the mobile and powder feeding effect of ideal developer.
In other embodiment, above-mentioned extension 832 is the radius-of-curvature that second arc section also can equal first arc section on xsect.In addition, this extension 832 can also be a straight-line segment on xsect, and this straight-line segment and first arc section are tangent or crossing.
The developing apparatus of said structure can be realized by following specific embodiment:
In order to satisfy the relational expression of df (V1+V2)/V1＜10, the cell density d of its powder feeding roller surface sponge part is 2.12cells/mm, and being arranged to line contact pressure f between powder feeding roller and the developer roll is 1.76g/mm.Developing apparatus 1 drives the spiral gear of developer roll 5 and the spur gear of powder feeding roller 6 by driving wheel respectively by helical teeth part and straight-tooth part, wherein, the helical teeth of driving wheel partly has 28 teeth, and straight-tooth partly has 42 teeth, the spiral gear of developer roll 5 has 15 teeth, and the spur gear of powder feeding roller 6 has 20 teeth; The radius of developer roll 5 is 8.44mm, and the radius of powder feeding roller 6 is 6.3mm.
If the angular velocity of driving wheel is ω d, the angular velocity of developer roll 5 is ω dr, and the angular velocity of powder feeding roller 6 is ω sr, and the rotational line speed of developer roll 5 is Vdr, and then there is following relation in the rotational line speed Vsr of powder feeding roller 6 circumferential surfaces:
ωdr/ωd＝28/15；ωdr＝1.8667ωd；
ωsr/ωd＝42/20；ωsr＝2.1ωd；
Vdr＝8.44*ωdr＝15.7549ωd；
Vsr＝6.3*ωsr＝13.23ωd；
(Vdr+Vsr)/Vdr＝(15.7549ωd+13.23ωd)/15.7549ωd＝1.8397；
Therefore, df (V1+V2)/V1=2.12*1.76*1.8397=6.864＜10 satisfies above condition.
Above-described only is preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (10)
1, a kind of developing apparatus comprises
The box body that is used for receiving photographic developer;
Rotatably be supported in developer roll and powder feeding roller on the box body, form extruding between described developer roll and the powder feeding roller and contact;
Be used to control the powder delivery cutter of developer layer thickness on the developer roll, this powder delivery cutter has the free end that forms Elastic Contact with described developer roll;
It is characterized in that:
Line contact pressure between described powder feeding roller and the developer roll is between 0.5～2g/mm, and the cell density of powder feeding roller surface portion is not more than 10cells/mm, and satisfies following relational expression between powder feeding roller and the developer roll:
df(V1+V2)/V1<10；
Wherein, d represents the cell density of powder feeding roller surface portion, and unit is cells/mm; F represents the line contact pressure between powder feeding roller and the developer roll, and unit is g/mm, the rotational line speed when V1 represents the work of developer roll circumferential surface, and unit is mm/sec, the rotational line speed when V2 represents the work of powder feeding roller circumferential surface, unit is mm/sec.
2, according to the described developing apparatus of claim 1, it is characterized in that:
Line contact pressure between described powder feeding roller and the developer roll is between 1.5～2g/mm.
3, according to the described developing apparatus of claim 1, it is characterized in that:
The cell density of described powder feeding roller surface portion is 1～5cells/mm.
4, according to the described developing apparatus of claim 1, it is characterized in that:
Described powder feeding roller surface portion is the sponge that polyester or polyethers material are made.
5, according to the described developing apparatus of claim 1, it is characterized in that:
The free end of described powder delivery cutter comprises a contact site and an extension;
Described contact site is first arc section on xsect, its radius-of-curvature is between 0.2mm～1 ware.
6, according to the described developing apparatus of claim 5, it is characterized in that:
Described extension is second arc section on xsect, its radius-of-curvature is greater than the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
7, according to the described developing apparatus of claim 5, it is characterized in that:
Described extension is second arc section on xsect, its radius-of-curvature equals the radius-of-curvature of described first arc section, and first arc section and second arc section are positioned at the same side of their common tangents.
8, according to the described developing apparatus of claim 5, it is characterized in that:
Described extension on xsect linearly the section, this straight-line segment and described first arc section are tangent or crossing.
9, according to each described developing apparatus of claim 5 to 8, it is characterized in that:
The public string of described contact site and developer roll with described contact site and the tangent line of extension junction between the angular range that forms be 20 °～60 °.
10, according to the described developing apparatus of claim 9, it is characterized in that:
Described angular range is 40 °～50 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100323667A CN101452243A (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100323667A CN101452243A (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101452243A true CN101452243A (en) | 2009-06-10 |
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ID=40734533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100323667A Pending CN101452243A (en) | 2007-12-07 | 2007-12-07 | Developing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101452243A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968621A (en) * | 2009-06-25 | 2011-02-09 | 富美科技有限公司 | Matching of HP 2400-series toner cartridge assemblies |
| CN101968620A (en) * | 2009-06-25 | 2011-02-09 | 富美科技有限公司 | Matching of HP 4200 series toner cartridge assembly |
| CN103885309A (en) * | 2014-03-10 | 2014-06-25 | 珠海天威飞马打印耗材有限公司 | Powder feeding roller and processing box |
-
2007
- 2007-12-07 CN CNA2007100323667A patent/CN101452243A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968621A (en) * | 2009-06-25 | 2011-02-09 | 富美科技有限公司 | Matching of HP 2400-series toner cartridge assemblies |
| CN101968620A (en) * | 2009-06-25 | 2011-02-09 | 富美科技有限公司 | Matching of HP 4200 series toner cartridge assembly |
| CN103885309A (en) * | 2014-03-10 | 2014-06-25 | 珠海天威飞马打印耗材有限公司 | Powder feeding roller and processing box |
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Application publication date: 20090610 |