CN101135879A - Developing apparatus, processing cartridge, and image forming apparatus - Google Patents

Developing apparatus, processing cartridge, and image forming apparatus Download PDF

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Publication number
CN101135879A
CN101135879A CNA2007101125841A CN200710112584A CN101135879A CN 101135879 A CN101135879 A CN 101135879A CN A2007101125841 A CNA2007101125841 A CN A2007101125841A CN 200710112584 A CN200710112584 A CN 200710112584A CN 101135879 A CN101135879 A CN 101135879A
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China
Prior art keywords
adjustment means
contact portion
bearing member
developer bearing
developer
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CNA2007101125841A
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Chinese (zh)
Inventor
西田真一
楸原一成
清水康史
横山胜则
吉岛直人
宇佐美博一
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Canon Inc
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Canon Inc
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Publication of CN101135879A publication Critical patent/CN101135879A/en
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Abstract

A sheet-shaped regulation member is supported by a supporting unit with an elastic force occurring by bending a sheet-shaped regulation member in the longitudinal direction thereof, and a force received as a result of being pressed by a developing roller. Thus, direct contact can be securely made onto a developer bearing member, and a regulation member can be provided which enables easily attaching thereof to the supporting member, as well as enabling a developing apparatus, processing cartridge, and image forming apparatus, to be reduced in size.

Description

Developing apparatus, handle box and imaging device
Technical field
The present invention relates to a kind of developing apparatus, a kind of handle box and a kind of imaging device.
Background technology
The method that method that contact is developed and noncontact are developed is known as the employed developing method that utilizes monocomponent toner at present.Particularly, proposed following method: (1) uses the contact developing method of the developer roll with elastic layer; (2) the noncontact developing method with magnetic color tuner of use metal sleeve, or the like.About these developing methods,, several measures has been proposed for the toner adjustment means in order on developer bearing member, to form the monocomponent toner of thinner layer.
(1) use has the contact developing method (Fig. 8) of the developer roll of elastic layer
Known a kind of developing method, wherein, development is to be undertaken by going up the nonmagnetic developer of carrying at developer roll 3 (developer roll 3 is the resilient roller with dielectric layer) and developer being contacted with the surface of photosensitive drums 1.Developer feeding is undertaken by donor rollers 5 to developer roll 3, and donor rollers 5 contacts with developer roll 3.Donor rollers 5 has following function: it is used for the developer of supplying developing agent container T and makes developer be fixed to developer roll 3, and is removing the developer that is retained on the developer roll 3 before the ensuing processing.
The adjusting that adheres to the developer layer on the developer roll 3 is undertaken by regulator adjustment means 4c is contacted with developer roll 3 with the triboelectric charge on being applied to it.Proposed a kind of developing member, it supports the distolateral 4c1 as the sheet metal of toner adjustment means 4c, and wherein following the and developer roll 3 of another distolateral 4c2 contacts.The electrostatic image that is formed on the photosensitive drums 1 develops by developer, and wherein developer is coated on the developer roll 3 by toner adjustment means 4c.
(2) it is known using the noncontact developing method of noncontact developing method (Figure 14) the use monocomponent toner with magnetic color tuner of metal sleeve, it is undertaken by using columniform development sleeve 3a, and the adjusting of developer layer is undertaken by toner adjustment means 4d is contacted in development sleeve 3a with the triboelectric charge that is applied thereto.Is to carry out in the mode of magnetic by magnet being arranged among the development sleeve 3a developer feeding to development sleeve 3a.
DC bias voltage and AC bias voltage are applied between development sleeve 3a and the photosensitive drums 1, and develop in non-contacting mode.Even do not having under the situation of enough electric charges, have too much toner on the development sleeve 3a, near magnetic pole being arranged in developing cell, also can suppress unnecessary toner development.Thus, Japanese Patent Laid Open Publication No.02-025866 proposes, and considers stability in contact, and the quantity of electric charge of the developer on the development sleeve 3a can be set to relatively low, and toner adjustment means 4d uses the rubber slab with low contact pressure.
But, under the situation of the vane type toner adjustment means of using contact developing method (1), construct and make thin elastic component supported along a side on vertically at it, and its following of part contacts with developer roll relatively.The problem of less device appears being difficult to make thus, thus.In other words, if reduce the size of toner adjustment means, the distance (drift just) between the point of the strong point of a side of the thin elastic component of support and contact developer roll shortens.Thus, the elastic constant of contact pressure increases, even and the desired location of toner adjustment means only change very little amount, the variation of contact pressure is also very big.Therefore in order to set stable contact pressure, need high-precision assembling.
In addition, the reducing of the drift of thin elastic component is easy to increase the influence of the inhomogeneous adhesion at support section one side place, and is increased in the difficulty of manufacturing than dingus in the whole difficulty that applies uniform pressure on vertically.
In addition, for the noncontact developing method (2) with magnetic color tuner, the sheet rubber that supports along a side is used as the toner adjustment means in the vertical.When under the shape of distortion, keeping the state of sheet rubber for a long time, be difficult to make the shape before rubber turns back to its distortion, so-called creep takes place thus.When creep took place, contact pressure changed, and therefore was difficult to the long-time stable contact pressure that obtains.Therefore need provide a solution to the problems referred to above.
Summary of the invention
The present invention relates to a kind of developing apparatus, a kind of handle box and a kind of imaging device, it can contact with the developer bearing member of adjustment means with stable manner.The invention still further relates to a kind of developing apparatus, a kind of handle box and a kind of imaging device, it has improved assembling, less size and has improved picture quality.
According to an aspect of the present invention, the developing apparatus that is used for imaging device comprises: developer bearing member, and it can bearing developer, is used to develop be formed at electrostatic latent image on the image bearing member; Supporting member, it supports developer bearing member; With the sheet-shaped regulation member, it contacts and can regulate the developer level by the developer bearing member carrying with developer bearing member.This sheet-shaped regulation member comprises: first contact portion, and it is by in the horizontal the distolateral place of support member support at the sheet-shaped regulation member, the end face part that first contact portion has the plane surface part and partly intersects with plane surface; Second contact portion, it is by support member support another distolateral place in the horizontal in adjustment means; With the 3rd contact portion, in adjustment means transversely, it contacts with developer bearing member between first contact portion and second contact portion.By the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps elastic force by producing by the 3rd contact portion that contact with developer bearing member, plane surface partly contacts with supporting member and by support member support.By receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, end face part contacts with supporting member and by support member support.
According to another aspect of the present invention, a kind of handle box that is releasably attached on the imaging device comprises image bearing member and above-mentioned developing apparatus.
According to another aspect of the present invention, a kind of imaging device that can form image on recording medium comprises image bearing member and above-mentioned developing apparatus.
With reference to the accompanying drawings, from the following description of exemplary embodiment, further feature of the present invention will become clearer.
Description of drawings
Fig. 1 is the synoptic diagram according to the developing apparatus of first embodiment.
Fig. 2 is the synoptic diagram according to the imaging device master unit of first embodiment.
Fig. 3 is the synoptic diagram according to the handle box of first embodiment.
Fig. 4 is the synoptic diagram according to the imaging device master unit of second embodiment.
Fig. 5 is the synoptic diagram according to the developing apparatus of second embodiment.
Fig. 6 A-6C is the synoptic diagram according to the toner adjustment means of first embodiment.
Fig. 7 A and 7B are the synoptic diagram of the toner adjustment means of first embodiment.
Fig. 8 is the synoptic diagram of the developing apparatus in the Comparative Examples 1.
Fig. 9 A and 9B are the synoptic diagram of the toner adjustment means in the Comparative Examples 2.
Figure 10 A-10C is the synoptic diagram of the toner adjustment means in Comparative Examples 3 and 4.
The synoptic diagram of Figure 11 A-11D has been described the extension of sweep of toner adjustment means and the vertical irregular structure that wherein takes place.
Figure 12 illustrates the evaluation result that suppresses photographic fog along with effluxion.
The synoptic diagram of Figure 13 A and 13B has been described the toner adjustment means Failure Mechanism that takes place.
Figure 14 is the synoptic diagram of the developing apparatus in the Comparative Examples 5.
Figure 15 is according near the detailed view the containment member of the stereographic map of the major part of the developing apparatus of the 3rd embodiment and development marginal portion.
Figure 16 A-16C is the synoptic diagram according to the containment member annex of the development marginal portion of the 3rd embodiment.
Figure 17 A-17D is according near the synoptic diagram the containment member of the development marginal portion of the 3rd embodiment.
Figure 18 is according near the synoptic diagram the containment member of the development edge part of Comparative Examples.
Embodiment
First embodiment
The structure of master unit
Fig. 2 is the synoptic diagram according to the imaging device of first embodiment.This imaging device A is the panchromatic laser printer that is used for electric photograph processing.Schematic configuration according to whole imaging device A of the present invention below will be described.
Handle box B (below be called box B) forms as a whole unit by charging device, developing apparatus D, cleaning device C and photosensitive drums 1.As shown in Figure 2, the box B in the vertical direction of the yellow of four delegation, magenta, cyan and black removably is arranged among the imaging device A.By being transferred on the intermediate transfer belt 20 of transfer device with the toner image that each box B forms, imaging device A forms full-colour image.To describe the imaging process at box B place after a while in detail.
The toner image that is formed on the photosensitive drums 1 is transferred on the intermediate transfer belt 20. Primary transfer roller 22y, 22m, 22c and 22k are arranged on the position, opposite of photosensitive drums 1 of each color, and intermediate transfer belt 20 is clipped between them.Then, image once all is transferred on the recording chart P, and secondary transfer roll 23 is arranged on the downstream on the direction of motion of intermediate transfer belt 20.Notice that the toner that is not transferred on the intermediate transfer belt 20 is collected by intermediate transfer belt clearer 21.
Recording chart P is arranged in the paper feeding cassette 24 of the bottom of imaging device A, and is carried by paper feed roller 25 according to the requirement of printing.The toner image that is formed on the intermediate transfer belt 20 is transferred on the recording chart P in the position of secondary transfer roll 23.
Next, by fixation unit 26 utilize heat with toner image to recording chart, and recording chart is discharged into the outside of imaging device A via paper feeder unit 27.
Imaging device A can be divided into the upper unit and the lower unit that stores transfer printing unit, recording medium etc. of the box B that stores four kinds of colors etc.Plug paper taking place or will changing under the situation of box B, open top or lower unit.
Notice that for the imaging device A according to present embodiment, the life-span of toner container is set to and can be used for about 4000 paper among the box B, wherein print area equals 5% of A4 breadth paper.
Next, description is utilized the imaging process of box B.Fig. 3 concentrates among four box B of delegation, and shows near the cut-open view it.
Photosensitive drums 1 can be used organic photo conductor drum, and wherein bottom, charge carrier generation layer and charge carrier transfer layer (it is a functional film) are coated on the periphery of aluminum barrel in order.In imaging process, drive photosensitive drums 1 with the direction of arrow of predetermined speed in figure by imaging device A.
The charging roller 2 that is arranged on the charging device E partly is pressed onto the rubber rollers of conducting electricity on the photosensitive drums 1 and rotation driving on the direction of arrow b.In charging process, apply-direct current of 1100V to the core of charging roller 2.The surface potential of photosensitive drums 1 is by the uniform dark potential (Vd) of induced charge formation-550V.
By scanning element 10 (10k, 10c, 10m and 10y) emission and surperficial in this uniform surface charge distribution with the spot pattern exposure (shown in the arrow L among Fig. 3) of the corresponding laser beam of view data.Then, by produce the charge carrier of layer from charge carrier, the surface charge that is exposed the part place reduces, and its electromotive force reduces.Thus, on photosensitive drums 1, form electrostatic latent image (part that is exposed has the bright current potential of V1=-100V, and unexposed part has the dark potential of Vd=-550V) as image-bearing unit.
Electrostatic latent image is to develop by the developing apparatus D with toner coat, and the toner coat is formed on the developer roll 3 with the predetermined coated weight and the quantity of electric charge.The developer roll 3 of developing apparatus D rotates on direction forward, as shown by arrow C, contacts with photosensitive drums 1 simultaneously.Then, by triboelectric charge fill negative electricity (for the DC bias voltage, be applied to DC bias voltage on it=-350V) toner only flies to bright current potential part by the electric potential difference at the developing cell place that contacts with photosensitive drums 1, and realized electrostatic latent image.
By primary transfer roller 22y, 22m, 22c and 22k intermediate transfer belt 20 is pressed to photosensitive drums 1 towards photosensitive drums 1.In addition, DC voltage is applied to primary transfer roller 22y, 22m, 22c and 22k, and forms electric field between primary transfer roller and photosensitive drums 1.Thus, the transfer area that the toner image of realizing on the photosensitive drums 1 contacts at above-mentioned described pressure receives the power from electric field, and is transferred on the intermediate transfer belt 20 from photosensitive drums 1.On the other hand, by being installed in the cleaning balde of making by urethane rubber 6 on the cleaning device C, striking off from the drum surface and not to be transferred and to be retained in toner on the photosensitive drums 1, and these toners are stored among the cleaning device C thus.
The developing apparatus that below detailed description is used for first embodiment of the invention.Fig. 1 shows developing apparatus D, and it uses the adjustment means 40 of first embodiment described below.Developing apparatus D comprises the developer reservoir that is used to store toner T, the developer roll 3, the toner supplying roller 5 that are used as developer bearing member and the agitation means 11 that is used to stir toner T.Developer roll 3 rotates on direction forward, shown in arrow c, contacts with photosensitive drums 1 simultaneously.Toner supplying roller 5 rotates on direction backward, shown in arrow d, contacts with developer roll 3 simultaneously.
In the present embodiment, for developer roll 3, use to have the resilient roller of 12mm diameter, wherein the conductive elastic layer of 3mm is formed on the core of 6mm diameter.For elastic layer, use to have 10 6The silicone rubber of Ω bulk resistor.Notice that the coat etc. that developer is had the charge deposition function can be arranged on the top layer of resilient roller.In the present embodiment, for stable manner and photosensitive drums 1 Elastic Contact, for JIS-A, the hardness of elastic layer should be 45 °.In addition, the surfaceness of developer roll 3 can depend on the particle diameter of the toner that uses, but should have the roughness of 3 μ m to 15 μ m with 10 mean roughness calculating.If the average particulate diameter of the toner-particle that uses is 6 μ m, 10 then desirable mean roughness will be between 5 μ m and 12 μ mRz.10 mean roughness Rz use the definition of JISB0601 appointment, and it measures the surface roughness tester " SE-30H " that uses by Kosaka Laboratory manufacturing.
In addition, in the present embodiment, for donor rollers 5, use the elastic sponge roller with 16mm diameter, wherein the isocyanurate foam of the relatively low hardness of 5.5mm is formed on the core that diameter is 5mm with foam texture.By constructing donor rollers 5 with the honeycomb foam of interconnection, donor rollers 5 can contact with developer roll 3 and not apply too big power.Carry out then toner being fed on the developer roll 3, and when developing, strike off the toner of remaining not usefulness with unevenness suitable on the foam texture.Have the honeycomb of scraping removing solid capacity and be not limited to form, but can use the rubber of the silicone rubber of foamed for example or ethylene-propylene-diene rubber (EPDM rubber) and so on by isocyanurate foam.
In addition, handle box B has toner adjustment means 40, develops along with developer roll rotates on sense of rotation c and prepares to be used for, and toner adjustment means 40 contacts with the place, downstream of developer roll 3 in donor rollers 5, and regulates the amount of developer.Toner adjustment means 40 is adjusted to toner scheduled volume and the quantity of electric charge is adjusted at the coated weight on the developer roll 3 and be suitable for the scheduled volume that develops on photosensitive drums 1.Below, will describe toner adjustment means 40 in detail with embodiment and Comparative Examples.
At first, for the of the present invention advantage of sharpening, each example and the Comparative Examples of using first embodiment will be described below according to first embodiment.
First embodiment
To the toner adjustment means 40 of present embodiment be described.Fig. 6 C shows the state of the toner adjustment means 40 of present embodiment, and with before developer roll 3 contacts, toner adjustment means 40 remains U-shaped.Shown in Fig. 6 C, the toner adjustment means of present embodiment (below be called " adjustment means ") the 40th, flexible sheet shape.Adjustment means 40 is supported by the sheet material retaining member 42 as support section.Now, crooked in the horizontal by making whole length, adjustment means 40 is formed U-shaped.Now, the end on one of the Width of adjustment means 40 distolateral (it is in the downstream with respect to the developer roll sense of rotation) becomes " first contact portion 47 ".Now, first contact portion 47 has been configured: the first plane surface part 47a, and it is positioned at the end on the Width of sheet element with flat shape; With end face part 47b, itself and the first plane surface part 47a intersect.The first plane surface part 47a is squeezed into sheet material support section 48 and contacts, and sheet material support section 48 is positioned on the inwall of recessed portion of sheet material retaining member 42.The reason that pressure works is the effect of elastic force F-1, wherein adjustment means 40 attempt from its along whole vertically and in the horizontal crooked state along returning.In addition, in order to make the mode effect of elastic force F-1 to determine, adjustment means 40 is configured with the first plane surface part 47a of the flat shape of first contact portion 47.Therefore, promptly be under the state that developer roll 3 is not installed, adjustment means 40 also can stably be supported by recessed sheet material retaining member 42 and not need to bond the part in the vertical of the sheet element that perhaps only bonds.But, in first embodiment, in situation lower support first contact portion that does not bond with second contact portion of describing after a while.
Next, will describe second contact portion 49, it is positioned at another distolateral go up (with respect to upstream side of developer roll sense of rotation) in the horizontal of first contact portion 47.In first embodiment, the same with first contact portion, second contact portion 49 is formed by the second plane surface part 49a and end face part 49b, and the first plane surface part 49a is positioned at flat shape on the end transversely of sheet element, and the end face part 49b and the second plane surface part 49a intersect.In addition,, utilize elastic force F1 that the second plane surface part 49a of second contact portion is expressed to sheet material support unit 48 and contact because adjustment means 40 forms U-shaped, the same with the first plane surface part 47a of first contact portion.Therefore, can support adjustment means 40 with stable manner, even first contact portion and second contact portion are not bonded on the sheet material retaining member 42 by sheet material retaining member 42.
Next, Fig. 6 A shows developer roll 3 wherein and carries out state of contact with predetermined amount of compression and the adjustment means 40 that remains U-shaped.
To the 3rd contact portion 46 that contact with developer roll 3 with adjustment means 40 be described.The 3rd contact portion 46 is configured between first contact member 47 and second contact member 49, and wherein first contact member 47 and second contact member 49 are positioned on two ends in the horizontal of sheet element 30.Then, when developer roll 3 is pressed to the adjustment means 40 that is supported for U-shaped, the pressure F-2 that the 3rd contact portion 46 receives from developer roll 3.In the received while of pressure F2, two ends in the horizontal of adjustment means 40 attempt to launch on the direction identical with elastic force F-1, and this makes the state attempt to be bent to from elastic component 40 U-shaped return.That is to say that owing to apply the effect of power on the direction of F-1, adjustment means 40 is subjected to the support of flexible sheet material retaining member (below be called " retaining member ") 42 with further stability.
In addition, by the 3rd contact portion 46, developer roll 3 is pressed to the adjustment means 40 that is supported for U-shaped.Then, the end face part 47b of first contact portion 47 stably contacts with the inner wall surface 42a of the recessed portion of retaining member 42, and its position is adjusted in preposition.
In addition, by the 3rd contact portion 46, developer roll 3 is further pressed to the adjustment means 40 that is supported for U-shaped.Then, adjustment means 40 is out of shape with restriceted envelope 8 along the circumferential surface of developer roll 3, and space 8 is restricted to the inside of U-shaped.That is to say, under adjustment means 40 and developer roll 3 state of contact, changed flexible sheet material at adjustment means 40 and the developer roll 3 flexibility 40a under the contact condition not.Thus, by making adjustment means 40 distortion, produced elastic force, and can guarantee contact pressure, with the toning dosage on the control developer roll 3 with stable manner.
In first embodiment, adjustment means 40 can be the urethane rubber that has 70 hardness according to JIS-A, and the sheet element of the above-mentioned 0.4mm of having thickness and 14.2mm lateral length is received in the recessed portion of the retaining member 42 with 6.0mm width.Thus, formed U-shaped.In the present embodiment, use urethane rubber, but, also can obtain confers similar advantages by using the rubber elastomer such as silicone rubber, NBR rubber.The contact conditions that is used for adjustment means 40 and developer roll 3 is an amount to be pressed into, and it is the desirable lap on the surface of the tip portion of adjustment means 40 and developer roll 3, and it can be 0.5mm.Thus, the setting value of contact pressure (linear pressure on the generatrix direction of developer roll) is set to 30N/m.
The normally used measuring method that is used for contact pressure is sheet material working pressure sensor (for example the Prescale film that is made by Fuji Film Corporation etc.).In the present embodiment, contact pressure is very low, and is difficult to measure with general pressure transducer.Therefore, the measurement of contact pressure is carried out as follows: with thickness is that the stainless hard H material layer of SUS304 of 20 μ m stacks, it is inserted in the contact site office of sheet element and developer roll 3, with linear direction that spring balance contacts on pull out thin plate from the center of surface of contact, and measure it and pull out required power.Thus, under known load acts on situation on the means of pressure measurement, can from experiment value with pull out the contact pressure that width that means of pressure measurement contacts obtains to measure.
In addition, in the present embodiment, the wall height on the downstream of the sense of rotation of developer roll 3 of retaining member 42 is set in the scope of S＜h＜0.8 * R.Shown in Fig. 6 B, S is that h is the bee-line from the inwall on the downstream to the developer roll surface at the thickness of regulating the toner coating (developer layer) on the developer roll after the toner.In Fig. 6 B, h represents the distance between a P and the some Q.R is when the radius-of-curvature along the whole sweep that vertically forms during the bent sheet member in the horizontal, and the state that separates of R value representation first contact portion.
Particularly, in the present embodiment, the width of the recessed portion of retaining member 42 is 6.0mm, and wherein to bend to the radius of curvature R of U-shaped approximately be 3.0mm to adjustment means 40.In addition, the thickness of toner coating is 30 μ m.Thus, the wall height on the downstream of being positioned at respect to the sense of rotation retaining member 42 of developer roll 3 is configured to make that the distance h at part place on the most close developer roll surface is 1.5mm.By the structure that layout has above-mentioned setting value, can improve the assembling and the picture quality of adjustment means 40.Its reason will described after a while.
Second embodiment
The adjustment means 40 and first embodiment according to present embodiment are basic identical, and its structure has following difference.At first, shown in Fig. 7 A, adjustment means 40 has second contact portion 49, and wherein adjustment means 40 waits the upstream side place on its sense of rotation that is fixedly fastened on developer roll 3 by bonding.Next, be arranged on the downstream on its sense of rotation of developer roll 3 as the sheet material retaining member 42a of the support unit that is used for the supporting flexible sheet material.In addition, retaining member 42a and the supporting member 43 that supports upstream side regularly are configured to separated from one another.Therefore, support the processing of adjustment means 40 with being used for fixing and can on the supporting member 43 at upstream side place, carry out independently, and therefore can minimize inhomogeneous etc. the influence of bonding.
For concrete method for supporting, by support the steel plate as supporting member 43 regularly via tack coat, adjustment means 40 forms second contact portion, shown in Fig. 7 A.On the contrary, the same being positioned on the downstream on its sense of rotation of developer roll 3 with first embodiment, make adjustment means 40 attempt to act on the flexible sheet material supporting zone 48 along the elastic force F-1 that whole vertically crooked in the horizontal state returns from it.Then, first contact portion 47 contacts with the first plane surface part 47a, stably keeps by retaining member 42a thus.
In addition, by the 3rd contact portion 46, developer roll 3 is pressed into the adjustment means 40 that is supported for U-shaped.Then, pressure F-2 acts on the 3rd contact portion 46.The end face part 47b of first contact portion 47 of adjustment means 40 stably contacts with the recessed inwall bottom surface 42a of retaining member 42, and the position of the 3rd contact portion 46 is adjusted to preposition.
The 3rd embodiment
The adjustment means 40 and first embodiment according to the 3rd embodiment are basic identical, and its structure has following difference.At first, shown in Fig. 7 B, difference is that adjustment means 40 waits the place, downstream on its sense of rotation that is fixedly fastened on developer roll 3 by bonding.In addition, the difference of support unit 42 is the unit that it and developer reservoir form as one.Therefore, can be so that assembling process be simpler, and can reduce device size.
For concrete method for supporting, by via tack coat with the inner wall surface of the recessed portion of retaining member 42 be fixedly fastened on developer roll 3 on the downstream on its sense of rotation, adjustment means 40 at its place, end on vertically, adjustment means 40 forms second contact portion 49, shown in Fig. 7 B.On the contrary, being positioned on the upstream side on its sense of rotation of developer roll 3, it is as first contact portion 47.The same with first embodiment, make adjustment means 40 attempt to act on the first plane surface part 47a of first contact portion from the elastic force F-1 that crooked along the longitudinal state returns.Thus, second contact portion 49 firmly contacts with the flexible sheet material supporting zone 48 of the recessed portion inwall of retaining member 42.
In addition, by the 3rd contact portion 46, developer roll 3 is pressed into the adjustment means 40 that is supported for U-shaped.Then, pressure F-2 acts on the 3rd contact portion 46, on the upstream side of adjustment means 40, the end 47b in the horizontal of first contact portion 47 firmly contacts with the bottom surface of the recessed portion inwall of retaining member 42, and the position of the 3rd contact portion 46 is adjusted to preposition.
Comparative Examples 1
The toner adjustment means 4c of this Comparative Examples 1 will be described with reference to figure 8.The toner adjustment means 4c of Comparative Examples 1 comprises the back up pad 4c1 that is fixed on the developer reservoir, back up pad 4c1 is supported along its side on vertically by lamellar elastic component 4c2 (for example phosphor bronze sheet or corrosion resistant plate), and its bottom to face portion contacts with developer roll 3.According to this Comparative Examples, thickness is that the iron plate of 1.2mm is used as back up pad, and thickness is that the phosphor bronze sheet of 120 μ m is fixed on the back up pad as lamellar elastic component 4c2.Distance (drift just) from support section one side of lamellar elastic component 4c2 to the contact portion that contacts with developer roll 3 is 14mm, and the amount that developer roll 3 is pressed among the lamellar elastic component 4c2 is 1.5mm.
Comparative Examples 2
Toner adjustment means 4 according to this Comparative Examples is illustrated among Fig. 9 A.According to this Comparative Examples, the lateral parts of supporting member does not have the supporting flexible sheet material, and being fixed on the supporting member 43b by bonding at its two end face 49b transversely of sheet element.
Comparative Examples 3
Toner adjustment means 4 according to this Comparative Examples is illustrated among Figure 10 A.Sheet element 4c is fixed on the two ends 49c of recessed portion bottom surface of supporting member 43c, is used for crookedly in the horizontal, and the protrusion surface that forms thus contacts with developer roll 3.
Here, be to be not used in the difference of first embodiment and carry out first contact portion that face contacts with sheet element to be kept or along developer roll distortion and the 3rd contact portion that is in contact with it.
Comparative Examples 4
With the toner adjustment means of describing according to this Comparative Examples.The toner adjustment means of this Comparative Examples shown in Figure 10 B make the tabular elastic body 4d that makes by rubber etc. towards developer roll 3d bending to produce outstanding shape, the two ends that are fixed on the fixed part 49d are arranged on the developing device frame.Center at the curved surface that bends to outstanding shape contacts with developer roll 3d.
In addition, do not carry out being difficult under the state of contact contacting with the surface of developer roll 3d under the situation of change at it, that is to say to contact to keep its flexibility with developer roll 3d in the flexibility of curved surface.
Here, be not to be out of shape the 3rd contact portion or the end face part that flexibly is supported on the support unit place of first contact portion or the end face part of second contact portion with the difference of first embodiment to contact along developer roll.
The evaluation method that is used for each example and Comparative Examples
Use description to determine the assessment item a to e of the difference between the present invention and the Comparative Examples.
The contact pressure estimation of stability of assessment item a-adjustment means
The contact stabilization of adjustment means is to estimate with following standard:
C: before the assembling developer roll, the state of adjustment means is unsettled, and the contact pressure in order need to obtain, and it needs high assembly precision.
B: before the assembling developer roll, the state of adjustment means is stable, but the contact pressure in order need to obtain, and it needs high assembly precision.
A: before the assembling developer roll, the state of adjustment means is stable, and the contact pressure in order need to obtain, and it does not need to have high assembly precision.
Assessment item b-be used for contact pressure estimation of stability than the adjustment means of dingus
The contact stabilization that is used for the adjustment means of less developing apparatus is to estimate with following standard:
C: for less device, high assembly precision that need be bigger than assessment item a.
A:, use the assembling identical with assessment item a for less device.
The even property of the vertical density unevenness of assessment item c-after endurancing
Solid picture is used for printing black on whole surface and whether observation exists density unevenness even with the upwardly extending perpendicular band in side that vertically (laser main scanning direction) is vertical by exporting, and carries out picture appraisal.
C: observe the even band of density unevenness more than five or five.
B: observe the even band of density unevenness at two or more below five.
A: observe the even band of density unevenness below one or one.
After 4000 paper of test printing, carry out the evaluation of the even property of vertical density unevenness.
Carry out test printing by supplying with paper continuously, the image scaled that the vertical line charting of record looks like to account for is 5%.
The evaluation result of first to the 3rd embodiment and Comparative Examples 1 to 4 is as shown in table 1.
Table 1
A. the contact pressure stability of adjustment means B. be used for contact pressure stability than the adjustment means of dingus C. vertical spares property to density unevenness
First embodiment A A A
Second embodiment A A B
The 3rd embodiment A A B
Comparative Examples 1 A C C
Comparative Examples 2 C C C
Comparative Examples 3 C C C
Comparative Examples 4 B C C
At first, will describe with respect to the advantage that is had with the corresponding Comparative Examples 1 of foliated lamellar toner adjustment means.Particularly, will compare first embodiment and Comparative Examples 1.
Comparative Examples 1 is known foliated lamellar toner adjustment means, as shown in Figure 8.It is characterized in that a side that goes up along the longitudinal supports the thin plate elastic component, and the following and developer roll 3 of thin plate elastic component contacts.Since inhomogeneous in the bonding that the fixed part office of support section that supports a side and thin plate elastic component takes place, fluctuation etc. may take place along the longitudinal.According to the structure of the toner adjustment means in the Comparative Examples 1, the contact width of toner adjustment means 4c and developer roll 3 is little, and therefore owing to fluctuate, vertically the contact pressure on may change easily.
Next, with the problem of describing than dingus.Comparative Examples 1 is at a side upper support thin plate elastic component, and therefore along with the amount that is pressed in the developer roll 3 increases, the variable quantity of the contact pressure of toner adjustment means also increases.So far, in order to make this minimize variations, from the strong point that supports this plate along a side in the vertical to contact point that developer roll 3 contacts distance (drift just) must be guaranteed to enough greatly, and must reduce spring constant.But under the less situation of device, drift shortens, and therefore spring constant increases.As a result, even only change very under the situation in a small amount at setting position in the toner adjustment means, the variation of contact pressure is also very big.In other words, for less device, be difficult to obtain predetermined stable contact pressure.
In addition, because spring constant increases, because the influence of vertical contact pressure unevenness of generations such as fluctuation along the longitudinal also enlarges markedly as mentioned above, and easier generation image color is vertically inhomogeneous.That is to say,,, need very high assembly precision for the stable contact pressure that obtains to be scheduled to for less device.
In addition, the method for utilizing handle box with four kinds of colors to be arranged in delegation's four (as shown in Figure 2) form have imaging device A than dingus and once form the full-colour image difficulty more that becomes.This is because the position of toner adjustment means greatly influences the spacing between the adjacent handle box.Particularly, each of needs a kind of charging, exposure and development handled uncrossed layout structure.In addition, owing to, need be used for the high-precision layout structure of developing cell from the influence of rocking of being accompanied by that toner carries, rotation, gravity etc.
But, for the contact pressure that need in Comparative Examples 1, to obtain, need guarantee from the strong point of a side upper support thin plate to contact point that developer roll 3 contacts distance, drift just, and spring constant need be remained less value.In other words, except above-mentioned high precision is arranged the requirement of structure, also be useful on and guarantee drift even higher requirement, therefore be difficult to make color-image forming apparatus A shown in Figure 2 to diminish.
On the contrary, utilize the sheet element among first to the 3rd embodiment,, along the longitudinal sheet element is formed U-shaped by in the horizontal sheet element being bent to the recessed portion (it is configured to developer reservoir) of retaining member 42.In addition, by form plane surface at the first plane surface part 47a place, adjustment means 40 contacts with the inwall of the recessed portion of retaining member 42.Thus, adjustment means 40 attempt the elastic force F-1 that returns along whole vertically crooked in the horizontal adjustment means 40 is fully worked.As a result, though not with situation that developer roll contacts under, also can stably keep U-shaped, and therefore can easily assemble adjustment means.
In addition, sheet element is located along the distortion of the circumferential surface of developer roll in the 3rd contact portion 46 (it is the part that contacts with developer roll), with the volume in the space 8 that reduces to be formed by sheet element on the inboard of U-shaped.Therefore, can guarantee the contact width of sheet element and developer roll, just be used to the enough width that contact.As a result, can stably carry out contacting between adjustment means 40 and the developer roll 3.That is to say,, can obtain the contact pressure of needs according to the spring constant of contact pressure by the size of adjusting space segment and the thickness and the hardness of sheet element.In addition, because do not need and the same predetermined drift of adjustment means in the Comparative Examples 1, can easily obtain the contact pressure that needs.
In addition, when developer roll 3 was pressed in the adjustment means 40 that is supported for U-shaped, the end face 47b of first contact portion is the bottom surface 42a of the recessed portion inwall of contact sheet retaining member securely, and is adjusted to preposition.In other words, if determined distance between the bottom surface of recessed portion inwall of the width of recessed portion of in the horizontal width of sheet element, sheet material retaining member 42 and developer roll 3 and sheet material retaining member 42, then can obtain contact position definitely.Therefore, can easily assemble adjustment means and not need high-precision adjustment.Thus, the contact pressure that the simple structure of adjustment means 40 and can easily obtaining needs, and therefore be not easy to come in contact in the vertical inhomogeneous of pressure.As a result, prevented the incidental image density of adjustment means vertically inhomogeneous of Comparative Examples 1.
As mentioned above, according to present embodiment, can easily obtain the contact pressure that needs and do not need high-precision assembling.Especially, according to first embodiment, can not take place because short drift (in Comparative Examples 1 and since size reduce cause drift to reduce) instability that causes contacts.As a result, can easily obtain the contact pressure that needs and not need high-precision assembling.In addition, even have less size, also can on whole length, stably keep the contact pressure of needs, and suppress the vertically inhomogeneous of picture quality.
In addition, utilize imaging device A, wherein four of the handle boxes of four kinds of colors are in line, and as shown in Figure 2, can once form full-colour image, and have improved the layout degree of freedom of sheet element, therefore reduce highly beneficial for size.
The advantage of comparing with Comparative Examples
Next, will be by relatively first embodiment and Comparative Examples 2 to 4 are described advantage of the present invention.
The estimation of stability contact of the estimation of stability result of adjustment means contact pressure and the adjustment means contact pressure that size reduces
At first, will the estimation of stability of the contact pressure of adjustment means be described.According to first embodiment, no matter the size of developing cell how, helps its stability.On the other hand, according to for example 2, no matter the size of developing cell how, its contact stabilization is relatively poor.
The adjustment means of Comparative Examples 2 shown in Figure 9 when sheet element is remained U-shaped, the side on the end in the horizontal of adjustment sheet material member not, but fix the end face in the horizontal of sheet element by bonding.According to this structure, the state of sheet element changes along with the rotation of developer roll, and the contact pressure that therefore can not obtain to be scheduled to.The reason of the state change of sheet element below will be described.
The 3rd contact portion 46 that sheet element contacts with developer roll upwards stands friction force along with the rotation of developer roll in week.Sheet element is attempted to utilize this friction force and is out of shape at the place, downstream of developer roll sense of rotation.According to Comparative Examples 2, shown in Fig. 9 B, sheet element does not have supporting member to regulate to attempt the sheet element in place, the downstream distortion of developer roll sense of rotation, and therefore sheet element can not remain under the state when developer roll stops, and sheet element subsides.
On the other hand, as shown in Figure 6A, first embodiment has the sheet material retaining member as support section, is used to make adjustment means 40 to avoid subsiding.Suppressed subsiding of sheet element thus.As a result, can stably carry out and the contacting of developer roll.
Next, the contact stabilization of the first and the 4th Comparative Examples is also slightly less than first embodiment.The third and fourth contact example all contact with developer roll, and the curved portions degree when making before contacting developer roll bent sheet member can not change.Therefore, the contact width between developer roll and the sheet element is less.
When contact width hour, for the contact pressure that obtains to be scheduled to, need high-precision assembling.In addition, because the change of the circumferential unevenness of developer roll and the developer roll diameter that caused by Iterim Change or environmental change, contact pressure may easily change.As a result, destroyed contact stabilization to a certain extent.In addition, for the developing cell of reduced size, contact width diminishes, and therefore needs the assembling of degree of precision.In addition, the contact pressure that causes owing to the change of developer roll diameter changes also and increases.As a result, under the situation of the developing cell that size reduces, contact stabilization reduces.In addition, according to Comparative Examples 3, the fixed support of sheet element only supports with sheet element end face and near the side the end face in the horizontal with fixing.Therefore, do not assemble under the state of developer roll only having assembled sheet element, it is unstable that the fixed support of sheet element becomes, and therefore compares with Comparative Examples 4, needs the assembling of degree of precision.
On the other hand, according to first embodiment, can stably guarantee enough wide contact width between adjustment means 40 and the developer roll 3, as shown in Figure 6A.Therefore, no matter the size of developing cell helps contact width.The reason that can guarantee enough wide contact width is that when adjustment means 40 contacts with developer roll 3 at the 3rd contact portion 46 places adjustment means 40 is along the peripheral surface distortion of developer roll 3.That is to say, contact, make the volume in the U-shaped space that forms by adjustment means 40 reduce.
In addition, the advantage of first embodiment is stably to keep enough contact widths.Its reason is that by developer roll 3 is pressed into adjustment means 40, adjustment means 40 has been carried out definite contacting at the first contact portion end face 47a place with the bottom surface 42a of the recessed portion inwall of retaining member, and its position is adjusted to preposition.As a result, even adjustment means 40 is very big along the amount of the surface deformation of developer roll 3 at the 3rd contact portion 46 places, also can guarantee contact width with stable manner.
In addition, this layout makes retaining member 42 (retaining member 42 is the support sections that are used for adjustment means) subside on the downstream along with the rotation of developer roll 3.Therefore, though adjustment means 40 at the 3rd contact portion 46 places along the bigger amount of the surface deformation of developer roll 3, also can suppress subsiding of sheet material.As a result, no matter whether developer roll 3 rotates, and can stably contact developer roll 3.
In addition, adjustment means 40 contacts with the inwall of the recessed portion of retaining member 42 at the first plane surface part 47a place with the form on plane.Therefore, elastic force F-1 fully works, and wherein adjustment means 40 attempts to return under the state of bending in the horizontal along the longitudinal from adjustment means 40.Therefore, though not with the developer roll state of contact under, also can keep stable U-shaped, make assembling easily thus.
As mentioned above, according to present embodiment, carry out and the contacting, contact of the first plane surface part 47a, and assign to suppress by the support portion on the downstream of its sense of rotation that is positioned at developer roll 3 with first the firm of end face part 47a.Thus, no matter whether developer roll 3 rotates, even adjustment means 40 along the surface deformation of developer roll 3, also can stably keep in touch state, easily guarantees enough contact widths thus.In addition, can only use the contact pressure that obtains needs simply is set, even and therefore reduced plant bulk, also can stably keep in touch state.
Vertically density unevenness is spared the evaluation result of property
Next, will be by relatively first to the 3rd embodiment and first to fourth Comparative Examples are described the evaluation that vertical density unevenness is spared property.In first embodiment,, all suppressed the even property of vertical density unevenness regardless of the size of developing cell.On the other hand, for second to the 4th Comparative Examples, the even situation of vertical density unevenness has taken place.Adjustment means in second to the 4th Comparative Examples is the two ends of support sheet member securely in the horizontal.As a result, take place easily because the influence that the contact pressure in the vertical that the inhomogeneous grade of bonding causes changes.In addition, as mentioned above, compare with first embodiment, the contact stabilization of second to the 4th Comparative Examples is relatively poor.As a result, pressure taking place easily on the whole length of developer roll changes.
On the other hand, as shown in Figure 6A, according to first embodiment, adjustment means 40 contacts with the inwall 48 of the recessed portion of sheet material retaining member 42 at the first plane surface part 47a place with the form on plane.Elastic force F-1 fully works, and wherein adjustment means 40 attempts to return under whole vertically crooked in the horizontal state from adjustment means 40, and therefore adjustment means 40 can be remained under the state that does not bond.Therefore, because do not bond unevenness, it is even to suppress vertical density unevenness.
In addition, according to first embodiment, adjustment means can be supported under the state that does not bond by sheet material retaining member 42, because the second plane surface part 49a is formed on the second contact site office that is on the upstream side, and the effect by elastic force F1, can stably contact.Thus, the unevenness that do not bond, and it is even therefore can to suppress vertical density unevenness.
In addition, according among the second and the 3rd embodiment each, second contact portion is respectively that horizontal upstream side and the downstream on the sense of rotation of developer roll 3 by the bonding sheet material forms.But, no matter whether only fixed an end of tabular sheet material in the Comparative Examples 1, the even possibility of vertical density unevenness takes place greater than the second and the 3rd embodiment.To describe the second and the 3rd embodiment with reference to Figure 11 and suppress the even reason of vertical density unevenness more than Comparative Examples 1.According to the second and the 3rd embodiment, can on whole length, keep in touch pressure, because can guarantee contact width fully, as description about contact stabilization.
In addition, the adjustment means here remains U-shaped with adjustment means 40 and contacts with developer roll 3.In this case, the adjustment means 40 for constituting U-shaped, take place in the bend office: the n1 that stretches on surface of contact one side, shrink m, shown in Figure 11 A on 8 one sides of space.Because the generation of stretching n1 can easily produce level and smooth part v, shown in Figure 11 B on whole length.Therefore, shown in Figure 11 C, since inhomogeneous in the bonding at second contact portion, 49 places that support adjustment means 40 regularly, fluctuation w takes place.But because the stretching n1 that takes place in the bend office, fluctuation weakened before arriving smooth v gradually, and the w that prevents from thus to fluctuate is delivered to smooth v.Therefore in other words, be easy to keep smooth v, and it is inhomogeneous to alleviate the contact pressure of the 3rd contact site office that contact with developer roll, and can suppresses vertical density unevenness and spare.In addition, even, also can easily form smooth v for forming the first plane surface part 47a of plane surface part to contact.In order to produce more level and smooth part of V, need alleviate vertically inhomogeneous that first contact portion 47 (it is the other end that does not fix by bonding of sheet element) locates to alleviate the vertical inhomogeneous w that second contact portion, 49 places that supported regularly take place.
In order to keep sheet element, use does not have the maintenance of bonding or keeps simply with the part that adheres to.Therefore, can alleviate the vertically inhomogeneous of first contact portion, 47 places, and can form smooth v effectively.In addition, because the first contact portion plane surface partly forms plane surface to contact, near first contact portion plane surface part, produce smooth v in the vertical.According to its action, also can form smooth v effectively.
In addition, utilize the 3rd contact portion 46 (it is the contact portion between adjustment means 40 and the developer roll 3), adjustment means 40 to be in contact with it, makes the volume of the U-shaped volume inside 8 that formed by adjustment means 40 more easily to reduce along the distortion of the peripheral surface of developer roll.
To its details be described with reference to figure 11D, Figure 11 D be in a second embodiment developer roll 3 with the 3rd contact portion 46 state of contact under, near the zoomed-in view of the 3rd contact portion 46.Shown in Figure 11 D, along the outer surface squeeze adjustments member 40 of developer roll so that the flexible sheet material distortion.As a result, in two corners of the 3rd contact portion 46, radius-of-curvature r2 and r3 less than adjustment means 40a not with the developer roll state of contact under radius of curvature R.Thus, stretching n2 and n3 take place, stretching n2 and n3 greater than flexible sheet material 40 at the stretching n1 that is positioned under the developer roll contact condition.Therefore, for second contact portion 49 that is supported regularly, if because fluctuation w takes place inhomogeneous grade of bonding, stretching n2 and n3 have suppressed fluctuation and have been delivered to the 3rd contact portion.As a result, can suppress the even generation of vertical density unevenness.
On the other hand, for Comparative Examples 4, shown in Figure 10 C, two the distolateral surfaces in the horizontal by fixed part 49b fixes sheet element may be easy to take place fluctuation w1 and w2.Under this state, even stretching n1 works, also produce rough surperficial v1, because as mentioned above can not be by alleviating the vertical inhomogeneous effect that obtains smooth of first contact portion.In other words,, come in contact the vertically inhomogeneous of pressure easily, because except the fluctuation on can not alleviating vertically, the fixed surface that is easy to generate fluctuation is increased to two for Comparative Examples 4.
In addition, according to Comparative Examples 4, the flexibility of sheet element remains on developer roll 3 does not carry out under the state of contact, and therefore two corners of the contact portion that contacts with developer roll 3 do not have big stretching.As a result, can not obtain to be delivered to part that developer roll contacts on the effect that suppresses of fluctuation, it is even that therefore vertical density unevenness takes place easily.
According to present embodiment, can stably guarantee contact width, and it is even to suppress vertical density unevenness.Even an end of bonding regularly of adjustment means 40 fluctuates, be delivered to the 3rd contact portion 46 because the fluctuation of the adhesive segment that the stretching of U-shaped sweep causes also is suppressed, so suppressed vertical density unevenness and spared.In addition, can stably keep adjustment means and need not bond, it is even further to suppress vertical density unevenness.In addition, the 3rd contact portion 46 contacts along whole developer roll, produces bigger stretching thus on two turnings of the 3rd contact portion 46, and the fluctuation that suppresses the binding part office thus is delivered to the 3rd contact portion 46, and it is even to suppress vertical density unevenness.
In addition, for the developing cell that size reduces, also can obtain and these advantage confers similar advantages.
Along with developer roll rotation, at the downstream part of contact position retaining member as support section
In order to describe,, the 4th to the 9th embodiment will be described now in the downstream part of contact position advantage as the sheet material retaining member of support section along with developer roll rotation.
These embodiment and first embodiment are basic identical, and their difference is as follows.
Shown in Fig. 6 B, extension as the part of the first contact portion plane surface on the downstream of developer roll sense of rotation, sheet material retaining member lower edge part P and and its nearest sleeve surface between distance h as follows: for the 4th embodiment is 3.2mm, for the 5th embodiment is 3.0mm, for the 6th embodiment is 2.7mm, for the 7th embodiment is 2.4mm, is 1.0mm for the 8th embodiment, is 0.8mm for the 9th embodiment.
For the radius of curvature R under the U-shaped state before the contact developer roll, the ratio of h and R is as follows: for the 4th embodiment is 1.07, for the 5th embodiment is 1.00, for the 6th embodiment is 0.90, for the 7th embodiment is 0.80, for the 8th embodiment is 0.33, is 0.27 for the 9th embodiment.Because the width of sheet material retaining member is 6.0mm, so radius of curvature R=3.0mm.
(=0.4mm) ratio is as follows: for the 4th embodiment is 8.0 to the thickness t of h and sheet element, for the 5th embodiment is 7.5, is 6.8 for the 6th embodiment, is 6.0 for the 7th embodiment, for the 8th embodiment is 2.5, is 2.0 for the 9th embodiment.
Evaluation method
Photographic fog after the durability experiment
Photographic fog is secondary picture quality feature, and it shows as background and becomes dirty, and a small amount of toner has wherein developed on unprinted white portion (unexposed portion).
(TC-6DS that Tokyo Denshoku makes) is measured as the light reflectivity of light from green optical filtering with photographic fog by the light reflective measurement mechanism, reflectivity is by obtaining from only deducting this light reflectivity from the reflectivity of recording chart, and is be evaluated as the photographic fog amount thus.The photographic fog amount is by ten positions of survey record paper and finds out its mean value and obtain.
B -: photographic fog amount from 1% to 2%
B +: photographic fog amount from 0.5% to 1%
A: the photographic fog amount is less than 0.5%
Standard B -No problem in actual use, but photographic fog occurs near near the problematic secondary image quality level (3% or more photographic fogs).In addition, standard B +Be the rank that slight photographic fog takes place, A is the rank that does not have photographic fog basically.
Under the environment of 32.5 ℃ environment temperatures and 80% relative humidity, estimate.The evaluation of photographic fog is carried out later at 4000 paper of printing.Print test by paper supply off and on, the image scaled of the document image of vertical line is 5%.Mean that off and on the waiting status through certain hour is printed next time again after printing.In addition, under the situation that other image errors take place, can avoid this zone and measure, make great efforts thus to estimate photographic fog in real mode.
Evaluation result
In the table 2 below the evaluation result of first embodiment and the 4th to the 9th embodiment is illustrated in.
Table 2
h(mm) (α＝h/R) β(＝h/t) Fog density
The 4th embodiment 3.20 1.07 8.0 B -
The 5th embodiment 3.00 1.00 7.5 B +
The 6th embodiment 2.70 0.90 6.8 B +
The 7th embodiment 2.40 0.80 6.0 A
First embodiment 1.50 0.50 3.8 A
The 8th embodiment 1.00 0.33 2.5 A
The 9th embodiment 0.80 0.27 2.0 A
The evaluation result of fog density after the endurancing
At first, the evaluation result of fog density is illustrated among Figure 12 after the endurancing.According to first embodiment and the 7th to the 9th embodiment, there is not photographic fog and highly beneficial thus basically.On the other hand,, have some photographic fogs, but it can't go wrong in actual use,, a spot of photographic fog take place for the 5th and the 6th embodiment for the 4th embodiment.
In other words, if the bee-line h from the some P of the following far-end of the inwall on the downstream that is positioned at the developer roll sense of rotation of supporting member recessed portion 42 to the developer roll surface changes, can think that the support of sheet element changes.Reason is as described below.
At first, the state that subsides of adjustment means 40 is shown in Figure 13 A and 13B.As shown in FIG. 13A, the some P of the edge part office of the inwall on the downstream of the recessed portion of retaining member is as the strong point, makes the downstream partial rotation of adjustment means 40.Thus, the edge surface perk in downstream and the z that subsides, adjustment means 40 is out of shape shown in Figure 13 A and 13B thus.
Shown in Figure 13 B, the adjustment means 40 of distortion is crooked between a P and some Q, and some Q is positioned on the sleeve surface from a shortest position of P distance, and elastic force F α takes place thus.With respect to the width of supporting member inwall, some P and the distance h of point between the Q are less, and therefore in the distance h between a P and Q, the elastic force F α that is under the state of flexible sheet material bending is very large value.That is to say that compare with the state that flexible sheet material does not wherein subside, the contact pressure of the 3rd contact portion 46 increases.As a result, in the wearing and tearing of the 3rd contact portion 46 places generation toner, when the toner wearing and tearing took place, it is difficult that the electric charge that makes toner obtain appropriate amount becomes.That is to say to have the toner of a little charge or the electric charge process sheet element that charges with reversed polarity.When the toner under this state applied developer roll and arrives developing cell, it is difficult that its electric control becomes, and toner is delivered to photosensitive drums.As a result, take place because the secondary image quality that photographic fog causes.
According to the 4th embodiment, h and the relation between the R shown in Fig. 6 B are h/R〉1.0, h just〉R, and therefore think that flexible sheet material subsides easily, wherein the some P of the marginal portion of the inwall in the recessed portion downstream of sheet material retaining member is as its strong point.Particularly, the edge part office is configured to contact with sheet element as the some P of the pivot point when adjustment means 40 is subsided.Therefore, the some P as the strong point by the marginal portion subsides easily, as shown in FIG. 13A.As a result, because the contact pressure of the 3rd contact portion 46 increases and the increase of toner wearing and tearing, think because the image of secondary mass has taken place photographic fog.
Compare with the 4th embodiment, the 5th and the 6th embodiment has improved because the secondary mass image that photographic fog causes.And the difference of the 4th embodiment is that the relation between h, R, the S is set in the scope of S＜h≤R, shown in Fig. 6 B.Therefore, reduced the distance h between some P and the developer roll surface, point P makes not allow the some P as pivot point of marginal portion to contact with sheet element in the process of subsiding of sheet element on the marginal portion of the recessed portion downstream of sheet material retaining member inwall.Thus, can prevent subsiding of sheet element.Here, S represents toner coating thickness, and h represents that enough big distance is not can destroy toner coating.
Therefore, compare, suppressed because the secondary mass image that photographic fog causes with the 4th embodiment.But, compare with the 7th to the 9th embodiment with first, a spot of secondary mass image takes place.It is as follows that reason can be thought.According to present embodiment, adjustment means 40 is the whole surface deformation along developer roll 3 at the 3rd contact portion 46 places.In other words, under adjustment means 40 and developer roll 3 state of contact, can not keep the flexibility under adjustment means 40 and developer roll 3 discontiguous states of flexible sheet material 40.Therefore, if increase the amount of pushing of developer roll, the end side surface in the horizontal of adjustment means 40 is expanded on the direction identical with elastic force, thus the range expansion of the contact inner wall surface of retaining member.Therefore, if developer roll is pushed into, and sheet element is under the state of distortion, and in the process that sheet element subsides, the some P as pivot point of marginal portion can easily contact with sheet element.As a result, a spot of subsiding taken place, it is considered to cause owing to photographic fog the reason of secondary mass image.
On the other hand,, do not have the feature of secondary mass image, therefore help image according to first embodiment and the 7th to the 9th embodiment.According to first embodiment and the 7th to the 9th embodiment, shown in Fig. 6 B, the relation between h, R and the S is configured to make S＜h≤0.8 * R.In other words,, under the state that pushes the distortion of developer roll 3 and sheet element, do not contact, need make S＜h≤0.8 * R with the some P as the strong point that subsides of marginal portion in order to make adjustment means 40 according to present embodiment.
As mentioned above, in order to suppress the secondary mass image that subsides and after long-time, suppress to cause of sheet element, preferably S＜h≤R owing to photographic fog.In addition, though flexible sheet material along the developer roll surface deformation, in order to suppress subsiding of sheet element, S＜h≤0.8 * R preferably.
In addition, according to the 9th embodiment, even under the state that does not have toner coating on the developer roll, sheet element can not separate.
Reason is that in the 9th embodiment, shown in Fig. 6 B, the relation between the thickness t of h and S and adjustment means 40 is set in the scope of S＜h≤2t.That is to say that the downstream inwall of sheet material retaining member 42 and the bee-line between the developer roll are 2t or below the 2t.Therefore, though adjustment means 40 subside, and even folding and adhere under the worse state of himself in adjustment means, its thickness is 2t, therefore can pass bee-line h, and adjustment means 40 can not separated in the downstream on the developer roll sense of rotation.Thus, even under toner does not adhere to state on the developer roll 3, can prevent adjustment means 40 separately.That is to say, if toner is lower and the situation of toner takes place not have on the part on surface of developer roll 3, friction increases, and subsiding of adjustment means 40 taken place, prevented that adjustment means 40 and sheet material retaining member 42 from separating, and therefore prevented the toner leakage.
Second embodiment
The schematic configuration view of Fig. 4 shows the imaging device according to second embodiment, and it uses developing apparatus of the present invention, and Fig. 4 is the cut-open view of monochromatic laser printer main unit.In addition, Fig. 5 is the cut-open view that is used for the developing apparatus of monochromatic laser printer.
According to present embodiment, development sleeve 3a is as developer bearing member, and development sleeve 3a is the metal sleeve that is coated with electroconductive resin on it.In addition, fixedly magnetic roller 7 is set, it has the predetermined polarity that development sleeve 3a inside is set.By the magnetic force of magnetic roller 7, the magnetic color tuner of developer reservoir inside is attracted to the surface of development sleeve 3a.The lip-deep magnetic color tuner that adheres to development sleeve 3a transmits by the rotation of development sleeve 3a on direction shown in the arrow c.But, in the process of the contact portion that process contacts with toner adjustment means 4, under pressure,, form charged toner coating through applying triboelectric charge also through after the layer adjusting.
According to present embodiment, the closest approach place between development sleeve 3a and photosensitive drums 1 keeps the spacing of 300 μ m.In addition ,-the DC bias voltage of 350V and the square wave AC bias voltage of 2400Hz, 1600Vpp be applied to development sleeve 3a.For first embodiment, on photosensitive drums 1, form the electrostatic image of Vd=-550V, V1=-100V.Then, by between photosensitive drums 1 and developing cell, coming back operations near the development sleeve 3a, on photosensitive drums 1, form toner image at the magnetic color tuner that stands the negative friction electric charge on the development sleeve 3a with the AC bias voltage.Notice that the magnetic roller among the development sleeve 3a has near the magnetic pole that is arranged on the developing cell.According to present embodiment, have the magnetic force of 800G by surface at development sleeve 3a, the toner that can suppress to have inappropriate electric charge flies to the Vd part mistakenly, for example can not set the toner of controlling with above-mentioned potential energy.
To describe according to second embodiment below and use situation of the present invention.
The tenth embodiment
Present embodiment is the embodiment that the sheet element that will use among first embodiment is used for the developing apparatus that second embodiment describes.
Comparative Examples 5
This Comparative Examples (Figure 14) is applied to the developing apparatus that second embodiment describes with toner adjustment means described below.The side that the back up pad 4d1 that is fixed on the developer reservoir goes up along the longitudinal of being configured such that toner adjustment means 4d in this Comparative Examples supports the rubber component 4d2 such as urethane rubber, and the part on its opposite contacts with development sleeve.
According to this Comparative Examples, thickness be the iron plate of 1.2mm as back up pad, and thickness is that the urethane rubber plate of 0.9mm adheres on the back up pad.Along the urethane rubber plate vertically on the support section arranged of a side be 6.5mm with distance (drift just) between the contact portion that contacts development sleeve, and the amount that development sleeve is pressed into urethane rubber is 3.1mm.
The advantage of using first embodiment of the invention also can be obtained by second embodiment fully.Below, will the advantage of second embodiment of the invention be described by contrasting the tenth embodiment and Comparative Examples 5.
At first, printing 100 paper and after it was not printed through 10 months, 32.5 and the environment of 80%Rh under carry out the picture appraisal of filled black image.Print test by supplying with the recording chart with vertical line continuously, image scaled is 5%.According to Comparative Examples 5, the secondary mass image takes place owing to density reduces in the place, two ends on vertical (main scanning direction of laser).And, do not have density to reduce, and help image at the place, two ends of filled black image according to the tenth embodiment.Its reason is as follows.
Come under the state of support rubber sheet material in a side that goes up along the longitudinal, the toner adjustment means 4d of Comparative Examples 5 contacts with development sleeve 3a.If for a long time rubber sheet is remained under the state of distortion, so-called creep then takes place, wherein be difficult to turn back to distortion state in the past.In other words, for a long time need not before elastic force since creep and for a long time need not after reduce, particularly come under the situation of support rubber sheet material in a side that goes up along the longitudinal, as Comparative Examples 5, the contact pressure that the two ends of contact portion are located reduces.In addition, because rubber sheet 4d2 is very little with the contact width that development sleeve 3a contacts, so be subjected to the influence that contact pressure changes in the Comparative Examples 5 easily.As a result, on two ends, be difficult to the contact pressure that maintenance needs, can not apply suitable electric charge, and reduce in the place, two ends of solid black image density.
On the other hand, according to the tenth embodiment, even creep takes place, sheet element two ends are in the horizontal supported along its whole length, and because of the surface deformation along development sleeve 3a, adjustment means 40 has contact width, and the contact pressure at place, two ends is difficult to reduce thus.As a result, though for a long time need not after, also can obtain stable contact pressure, and suppress at place, the end of filled black image because the secondary mass image that the density reduction causes.
In addition, according to Comparative Examples 5, under the situation that the size of developing cell reduces, need high-precision installation.Its reason is as follows.Use at toner adjustment means 4d under the situation of foliated lamellar adjustment means, the material that is used for supporting member is iron normally, wherein supports required rigidity reposefully in the vertical and its cost has good balance.But, reducing under the situation of size, this supporting member influences near the magnetic force the adjustment means, because supporting member is near near the development sleeve.As a result, when back up pad only moved very in a small amount, the toner adjustment state also changed, and needs the assembly precision that improves thus.
On the other hand, root degree the tenth embodiment, by supporting member is used nonmagnetic substance, even size reduces, adjustment means also can not be subjected to the influence of magnetic force, can obtain required contact pressure with stable manner thus.
The 3rd embodiment
The structure of development end seal member
Next, will the structure of development end seal member 7 related to the present invention be described.
Figure 15 is the stereographic map of major part of developing apparatus and near the detailed view the development end seal member 7.Development end seal member 7 is arranged on the outside of developing device frame cells D preventing that toner from leaking, and on the two ends in the axial direction of developer roll 3.Development end seal member 7 forms insulating mat etc., and is bonded on the wall surface at the part place that is arranged on the developing device frame cells D.
Development end seal member 7 is bonded on the wall surface at the part place that is arranged on the developing device frame unit, has fixing interval with the outer surface with developer roll 3, and the thickness at this interval is configured to the thickness less than development end seal member 7.Thus, development end seal member 7 is crushed between the matrix surface of developer roll 3 and developing device frame unit, prevents that thus toner from leaking, and wherein, development end seal member 7 is bonded on the developing device frame unit.
Incidentally, according to present embodiment, adjustment means 40 place, two ends in the vertical with flexible sheet has recessed notch portion 71, shown in the top among Figure 16 A.If the adjustment means 40 with above-mentioned shape is located to be formed on the notch portion 71 as two ends in the vertical, zone 75 (wherein not forming sweep) of bonding part, shown in Figure 16 B along whole vertically crooked in the horizontal.Thus, shown in Figure 16 C, development end seal member 7 is bonded on retaining member 42 and the developing device frame cells D (not shown) at 75 places, zone that do not form above-mentioned sweep.
Now, development end seal member 7 is arranged as with end face 76 longitudinally contacts, end face 76 intersects with the 3rd contact portion 46 of adjustment means 40.Therefore, can not be distorted on the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46).As a result, can prevent that influence owing to the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46) from making the toner coating degradation on the developer roll 3.
In addition, because the bend office of adjustment means 40 is not distorted, leak from the space that is distorted so suppressed toner.
In addition, development end seal member 7 is arranged as with longitudinal terminal surface 76 and contacts, and end face 76 intersects with the 3rd contact portion of adjustment means 40.Therefore, regulated adjustment means 40 motion in the vertical.
That is to say that development end seal member 7 also carries out the position of adjustment means 40 in the vertical and determines.Therefore, no matter whether adjustment means 40 is bonded on the retaining member 42, can prevent because long-time the variation waits the adjustment means 42 that causes to move towards the position of a side in the vertical.As a result, prevented between the longitudinal end of adjustment means 40 and development end seal member 7, to produce the gap.That is to say, can suppress toner long-term and stably, simultaneously the contact stabilization in the maintenance vertically from end leakage.
In addition, according to present embodiment, by 73 places, bonding part that recessed notch portion forms are set in adjustment means 40, development end seal member 7 is squeeze adjustments member 40 on the direction identical with the direction of extrusion of developer roll 3.Thus, can suppress adjustment means 40 and leave retaining member 42, and can prevent that toner from leaking.In addition, suppressed formant and broken down, for example adjustment means 40 separate and via hop to coating of photographic fixing part or the like.
Note, use the notch portion 71 of form shown in the bottom of Figure 16 A also can obtain confers similar advantages.
Comparative Examples 6
Here, Figure 18 illustrates Comparative Examples 6, to describe the problem when development end seal member 7 contacts with the surface of the sweep that contacts developer roll 3 (the 3rd contact portion 46).
The developing apparatus of describing among the developing apparatus of this Comparative Examples and first embodiment is similar substantially, and their difference is as follows.At first, adjustment means 40 does not have the notch portion identical with first embodiment.In addition, at the longitudinal end place of the 3rd contact portion, with the identical direction of direction of extruding developer roll 3 on extruding development end seal member 70, and containment member 70 be arranged on longitudinal end sentence location adjustment means 40.
When development end seal member 7 contacts with the surface of the sweep (the 3rd contact portion 46) of adjustment means, be distorted with the part place that contacts with development end seal member 7 of adjustment means 40.The contact area (three contact portion 46) of this distortion between developer roll 3 and adjustment means 40 exerted one's influence, and the toner coating of secondary mass takes place on developer roll 3 owing to the influence of above-mentioned distortion thus.
In addition, because above-mentioned distortion, development end seal member 7 and adjustment means 40 can not adhere to each other fully.In other words, produce the gap at development end seal member 7 with between the distortion generating unit of the bend office of adjustment means 40 is divided.Therefore, because can not obtain to adhere to fully, leak so toner takes place from the end to prevent that toner from leaking.
In addition, as another modified example, the kerf difference at the longitudinal end place of adjustment means 40, as mentioned above.Synoptic diagram as shown in figure 17.
The adjustment means 40 that is used for present embodiment has otch 72 at the longitudinal end place, shown in Figure 17 A.When sheet material bending, make that along whole sweep is formed on the adjustment means 40, shown in Figure 17 B when vertically and in the horizontal crooked with above-mentioned shape.Now, adjustment means 40 forms sweep at sweep 78 places that contact with developer roll 3 and sweep 77 places that are positioned at longitudinal end, and vertically the otch on is as the edge.
Here, development end seal member 7 is arranged to contact with longitudinal terminal surface 76, and longitudinal terminal surface 76 intersects with the 3rd contact portion of adjustment means 40.Therefore, the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46) can not be distorted.As a result, can suppress the secondary mass toner coating on the developer roll 3,, then may produce the toner coating of secondary mass if be distorted in the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46).
In addition, because prevented to be distorted, so suppressed to leak toner from the space of twist part office in the bend office of adjustment means 40.
In addition, development end seal member 7 is arranged to contact with longitudinal terminal surface 76, and longitudinal terminal surface 76 intersects with the 3rd contact portion of adjustment means 40.Therefore, regulated adjustment means 40 moving in the vertical.That is to say that development end seal member 7 also carries out the position of adjustment means 40 in the vertical and determines.Therefore, no matter whether adjustment means 40 is bonded on the retaining member 42, can prevent because long-time the variation waits the adjustment means 42 that causes to move towards the position of a side in the vertical.As a result, prevented between the longitudinal end of adjustment means 40 and development end seal member 7, to produce the gap.That is to say, can suppress toner long-term and stably, simultaneously the contact stabilization in the maintenance vertically from end leakage.
Now, shown in Figure 17 C, development end seal member 7 is bonded on the developing device frame cells D, with the surface pressure of sweep 77 at longitudinal end place as the bonding part.On the direction identical with the direction of extrusion of developer roll 3, development end seal member 7 is pressed to support section with adjustment means 40.Thus, can suppress adjustment means 40 and separate, and can prevent that toner from leaking with supporting member 42.In addition, suppressed formant and broken down, for example adjustment means 40 separate and via hop to coating of photographic fixing part or the like.
In addition, the sweep 77 of longitudinal end is included in the space segment with the fold state, shown in Figure 17 D.Notice that Figure 17 D is according to the cross-sectional schematic around the adjustment means 40 of the developing apparatus of present embodiment.The sweep 77 that is included in the space segment at the longitudinal end place is pulled on the recessed inwall of retaining member 42, and elastic force works thus.As a result, adjustment means 40 is supported on the retaining member 42 with further stability.Moving on therefore, can suppressing vertically.
Now, the summary of the 3rd embodiment will be provided.Development end seal member 7 is arranged to contact with longitudinal terminal surface 76, and longitudinal terminal surface 76 intersects with the 3rd contact portion of adjustment means 40, and therefore, the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46) can not be distorted.As a result, can suppress the secondary mass toner coating on the developer roll 3,, then may produce the toner coating of secondary mass if be distorted in the surface of the sweep that contacts with developer roll 3 (the 3rd contact portion 46).
Because prevented to be distorted, so suppressed to leak toner from the space in the twist part office in the bend office of adjustment means 40.
Development end seal member 7 is arranged to contact with longitudinal terminal surface 76, and longitudinal terminal surface 76 intersects with the 3rd contact portion of adjustment means 40.Therefore, regulated adjustment means 40 moving in the vertical.That is to say that development end seal member 7 also carries out the position of adjustment means 40 in the vertical and determines.Therefore, no matter whether adjustment means 40 is bonded on the retaining member 42, can prevent because long-time the variation waits the adjustment means 42 that causes to move towards the position of a side in the vertical.As a result, prevented between the longitudinal end of adjustment means 40 and development end seal member 7, to produce the gap.That is to say, can suppress toner long-term and stably, simultaneously the contact stabilization in the maintenance vertically from end leakage.
On the direction identical, by 73 places, bonding part that recessed notch portion forms, development end seal member 7 squeeze adjustments members 40 are set in adjustment means 40 with the direction of extrusion of developer roll 3.Thus, can suppress adjustment means 40 and separate, and can prevent that toner from leaking with supporting member 42.In addition, suppressed formant and broken down, for example adjustment means 40 separate and via hop to coating of photographic fixing part or the like.
The sweep 77 that is included in the space segment at the longitudinal end place is pulled on the recessed inwall of retaining member 42, and elastic force works thus.That is to say that adjustment means 40 is supported on the retaining member 42 with further stability.Moving on therefore, can further suppressing vertically.
As mentioned above, according to the present invention, adjustment means can contact with developer bearing member with stable manner.In addition, can easily carry out adjustment means position in the vertical determines.In addition, the assembling of adjustment means can be improved, and the size of developing apparatus, handle box and imaging device can be reduced.
Although reference example embodiment has described the present invention, should be appreciated that to the invention is not restricted to disclosed exemplary embodiment.The scope of claims should be the wideest explanation that comprises modification, equivalent structure and function.

Claims (33)

1. developing apparatus that is used for imaging device comprises:
Developer bearing member, it can bearing developer, is used to develop be formed at electrostatic latent image on the image bearing member;
Supporting member, it supports developer bearing member; With
The sheet-shaped regulation member, it contacts and can regulate the amount by the developer of developer bearing member carrying with developer bearing member, and described sheet-shaped regulation member comprises:
First contact portion, it is by in the horizontal the distolateral place of support member support at the sheet-shaped regulation member, the end face part that described first contact portion has the plane surface part and partly intersects with plane surface;
Second contact portion, it is by support member support another distolateral place in the horizontal in adjustment means; With
The 3rd contact portion, it transversely contacts with developer bearing member between first contact portion and second contact portion adjustment means,
Wherein, by the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps elastic force by producing by the 3rd contact portion that contact with developer bearing member, plane surface partly contacts with supporting member and by support member support, and
Wherein, by receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, end face part contacts with supporting member and by support member support.
2. developing apparatus according to claim 1,
Wherein, the end face part that described second contact portion has the plane surface part and partly intersects with plane surface,
By the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps by elastic force by the 3rd contact portion generation that contacts with developer bearing member, the plane surface of second contact portion part contacts with supporting member and by support member support, and
By receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, the end face part of second contact portion contacts with supporting member and by support member support.
3. developing apparatus according to claim 1, wherein, the upstream end of described second contact portion on the direction of motion of developer bearing member is fixed on the support section.
4. developing apparatus according to claim 1, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (1) to set up:
S＜h≤R (1)
Wherein, (h) be bee-line between the surface of the supporting member of the most close the 3rd contact portion and developer bearing member, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
5. developing apparatus according to claim 1, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (2) to set up:
S＜h≤0.8×R (2)
Wherein, (h) be the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
6. developing apparatus according to claim 1, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (3) to set up:
S＜h≤2×t (3)
Wherein, (h) being the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) is by the thickness of the developer layer of adjustment means adjusting, (t) is the thickness of sheet-shaped regulation member.
7. developing apparatus according to claim 1, wherein, developer comprises magnetisable material, have magnet in the developer bearing member, and supporting member is made up of non-magnetic material.
8. developing apparatus according to claim 1, wherein, supporting member is configured to form the part of the developer reservoir of developing apparatus.
9. developing apparatus according to claim 1, wherein, the 3rd contact portion is along its shape of surface modification of developer bearing member, and contacts with the surface of developer bearing member.
10. developing apparatus according to claim 1, also comprise distolateral and another containment member on distolateral in the vertical that is arranged on developer bearing member, prevent that the described containment member that developer leaks into the developing apparatus outside is pressed onto adjustment means on the supporting member, and the regulating and controlling member is in its motion on vertically.
11. developing apparatus according to claim 10, wherein, described adjustment means has the bonding part that forms by crooked adjustment means along the longitudinal, the bonding part comprises and is positioned at described one distolateral and another recessed notch portion on distolateral, wherein, described adjustment means is forced on the supporting member, and comes the motion in the vertical of regulating and controlling member by the containment member that engages with the bonding part.
12. a handle box that is releasably attached on the imaging device comprises:
Image bearing member;
Developer bearing member, it can bearing developer, is used to develop be formed at electrostatic latent image on the image bearing member;
Supporting member, it supports developer bearing member; And
The sheet-shaped regulation member, it contacts and can regulate the amount by the developer of developer bearing member carrying with developer bearing member, and described sheet-shaped regulation member comprises:
First contact portion, it is by in the horizontal the distolateral place of support member support at the sheet-shaped regulation member, the end face part that first contact portion has the plane surface part and partly intersects with plane surface;
Second contact portion, it is by support member support another distolateral place in the horizontal in adjustment means; With
The 3rd contact portion, in adjustment means transversely, it contacts with developer bearing member between first contact portion and second contact portion,
Wherein, by the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps elastic force by producing by the 3rd contact portion that contact with developer bearing member, plane surface partly contacts with supporting member and by support member support, and
Wherein, by receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, end face part contacts with supporting member and by support member support.
13. handle box according to claim 12,
Wherein, the end face part that second contact portion has the plane surface part and partly intersects with plane surface,
By the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps by elastic force by the 3rd contact portion generation that contacts with developer bearing member, the plane surface of second contact portion part contacts with supporting member and by support member support, and
By receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, the end face part of second contact portion contacts with supporting member and by support member support.
14. handle box according to claim 12, wherein, the upstream side place of second contact portion on the direction of motion of developer bearing member is fixed on the support section.
15. handle box according to claim 12, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (1) to set up:
S＜h≤R (1)
Wherein, (h) be the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
16. handle box according to claim 12, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (2) to set up:
S＜h≤0.8×R (2)
Wherein, (h) be the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
17. handle box according to claim 12, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (3) to set up:
S＜h≤2×t (3)
Wherein, (h) being the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) is by the thickness of the developer layer of adjustment means adjusting, (t) is the thickness of sheet-shaped regulation member.
18. handle box according to claim 12, wherein, developer comprises magnetisable material, have magnet in the developer bearing member, and supporting member is made up of non-magnetic material.
19. handle box according to claim 12, wherein, supporting member is configured to form the part of the developer reservoir of handle box.
20. handle box according to claim 12, wherein, the 3rd contact portion is along its shape of surface modification of developer bearing member, and contacts with the surface of developer bearing member.
21. handle box according to claim 12, also comprise distolateral and another containment member on distolateral in the vertical that is arranged on developer bearing member, prevent that the containment member that developer leaks into the developing apparatus outside is pressed onto adjustment means on the supporting member, and the regulating and controlling member is in its motion on vertically.
22. handle box according to claim 21, wherein, adjustment means has the bonding part that forms by crooked adjustment means along the longitudinal, the bonding part comprises and is positioned at described one distolateral and another recessed notch portion on distolateral, wherein, adjustment means is forced on the supporting member, and comes the motion in the vertical of regulating and controlling member by the containment member that engages with the bonding part.
23. the imaging device that can form image on recording medium comprises:
Image bearing member;
Developer bearing member, it can bearing developer, is used to develop be formed at electrostatic latent image on the image bearing member;
The sheet-shaped regulation member, it contacts and can regulate the amount by the developer of developer bearing member carrying with the developer bearing member that supports by supporting member, and described sheet-shaped regulation member also comprises:
First contact portion, it is by in the horizontal the distolateral place of support member support at the sheet-shaped regulation member, the end face part that first contact portion has the plane surface part and partly intersects with plane surface;
Second contact portion, it is by support member support another distolateral place in the horizontal in adjustment means; With
The 3rd contact portion, in adjustment means transversely, it contacts with developer bearing member between first contact portion and second contact portion,
Wherein, by the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps elastic force by producing by the 3rd contact portion that contact with developer bearing member, plane surface partly contacts with supporting member and by support member support, and
Wherein, by receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, end face part contacts with supporting member and by support member support.
24. the imaging device that can on recording medium, form image according to claim 23,
Wherein, the end face part that second contact portion has the plane surface part and partly intersects with plane surface,
By the elastic force that produces by adjustment means along the longitudinal bending of adjustment means, perhaps elastic force by producing by the 3rd contact portion that contact with developer bearing member, plane surface partly contacts with supporting member and by support member support, and
By receive from developer bearing member because the 3rd contact portion contacts the power that produces with developer bearing member, end face part contacts with supporting member and by support member support.
25. the imaging device that can form image on recording medium according to claim 23, wherein, the upstream side place of second contact portion on the direction of motion of developer bearing member is fixed on the support section.
26. the imaging device that can form image on recording medium according to claim 23, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (1) to set up:
S＜h≤R (1)
Wherein, (h) be the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
27. the imaging device that can form image on recording medium according to claim 23, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (2) to set up:
S＜h≤0.8×R (2)
Wherein, (h) be the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) be the thickness of the developer layer regulated by adjustment means, (R) be adjustment means not with the developer bearing member state of contact under, the radius-of-curvature that crooked along the longitudinal adjustment means produces.
28. the imaging device that can form image on recording medium according to claim 23, wherein, the place, downstream on the direction of motion of developer bearing member keeps following formula (3) to set up:
S＜h≤2×t (3)
Wherein, (h) being the supporting member of the most close the 3rd contact portion and the bee-line between the developer bearing member surface, (S) is by the thickness of the developer layer of adjustment means adjusting, (t) is the thickness of sheet-shaped regulation member.
29. the imaging device that can form image on recording medium according to claim 23, wherein, developer comprises magnetisable material, have magnet in the developer bearing member, and supporting member is made up of non-magnetic material.
30. the imaging device that can form image on recording medium according to claim 23, wherein, supporting member is configured to form the part of the developer reservoir of developing apparatus.
31. the imaging device that can form image on recording medium according to claim 23, wherein, the 3rd contact portion is along its shape of surface modification of developer bearing member, and contacts with the surface of developer bearing member.
32. the imaging device that can on recording medium, form image according to claim 23, wherein, imaging device has containment member, containment member be arranged on developer bearing member in the vertical one distolateral and another distolateral on, and prevent that developer from leaking into the developing apparatus outside, and containment member is pressed onto adjustment means on the supporting member, and the motion of regulating and controlling member on it is vertical.
33. the imaging device that can on recording medium, form image according to claim 23, wherein, adjustment means has the bonding part that forms by crooked adjustment means along the longitudinal, the bonding part is to be positioned at described one distolateral and another recessed notch portion on distolateral, wherein, adjustment means is forced on the supporting member, and comes the motion in the vertical of regulating and controlling member by the containment member that engages with the bonding part.
CNA2007101125841A 2006-06-23 2007-06-22 Developing apparatus, processing cartridge, and image forming apparatus Pending CN101135879A (en)

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JP2006173618 2006-06-23
JP173618/2006 2006-06-23
JP173617/2006 2006-06-23
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Publication number Priority date Publication date Assignee Title
CN113110007A (en) * 2015-12-25 2021-07-13 兄弟工业株式会社 Developing box

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US4742797A (en) * 1987-06-25 1988-05-10 Xerox Corporation Tear drop seal
JP2001125357A (en) * 1999-10-25 2001-05-11 Matsushita Graphic Communication Systems Inc Process cartridge and image forming device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113110007A (en) * 2015-12-25 2021-07-13 兄弟工业株式会社 Developing box

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