CN101251735A - Developing device and image forming apparatus - Google Patents

Abstract

A developing device is provided having a simple configuration by which a desired amount of developer can be delivered to an image bearing member, and there is provided an image forming apparatus having the developing device. The developing device includes a developing roller by which two-component developer is borne and delivered to a photoreceptor drum, a layer thickness-regulating member for regulating a layer thickness of the developer, and a magnetism-generating member for generating magnetism, and a control unit for controlling an amount of displacement of the magnetism-generating member. The control unit 23 controls an amount of displacement of the magnetism-generating member relative to the development sleeve.

Description

Developing apparatus and image processing system

Technical field

The present invention relates to use developing apparatus that two-component developing agent develops to electrostatic latent image and the image processing system that possesses this developing apparatus.

Background technology

Utilize xerography to form the image processing system of the electrofax mode of image, have the developing apparatus that the electrostatic latent image that is formed at photoreceptor is developed.As developing apparatus, the developing apparatus that has the two-component developing agent that use forms by toner and carrier (below be sometimes referred to as " developer ") that electrostatic latent image is developed.This bi-component developing apparatus, the developer that the developer carrier carrying is accommodated by developer container, and, in developing regional, the toner in the developer is offered photoreceptor to carrying with the opposed developing regional of photoreceptor, come thus electrostatic latent image is developed.In developing apparatus, developer is owing to the magnetic force of the magnetic roller of dress in the developer carrier is carried on developer carrier.

In the bi-component developing apparatus, toner is consumed along with the formation of image, and carrier is repeated to use in during certain.Deterioration takes place owing to accepting all stress in carrier during being repeated to use.So-called stress, for example environmental changes such as temperature and humidity of the set environment of image processing system, because generating heat and the pressure that causes with high-speed mobile at the formed close clearance of layer-thickness restriction member of the bed thickness that is used for limiting developer owing to developer etc. of making for a long time that image processing system work causes from the each several part in the image processing system.Usually because this image force, toner is attached to the surface of carrier on electric, and still, because these stress, the toner that carrier surface has taken place does not break away from carrier, has covered carrier surface, the so-called phenomenon that is called as inefficacy (spent) along with the time.The phenomenon that certain coating material that the covering carrier surface also takes place is peeled off.Therefore, the flowability of developer is worsened, the amount of the developer of being carried by developer carrier reduces.Accompany therewith, the bed thickness of the toner layer that layer-thickness restriction member limited also diminishes, and therefore, the development amount that the electrostatic latent image on the photoreceptor is developed reduces, and causes image color to reduce.

In addition, carrier and toner since mutual friction and charged, toner and carrier are all owing to the electrical insulating property that is had is separately kept carried charge.But because the variation of surrounding environment, the carried charge of toner is subjected to great influence, and for example the carried charge of developer reduces under hot and humid condition, therefore, exists and takes place that toner disperses and the problem of consumption of toner increase etc.

A kind of developing apparatus that is used to address the above problem is now disclosed as prior art.In the developing apparatus of the prior art, for even surrounding environment changes, can not produce the not even image deflects such as image blurring of concentration yet, the throughput direction of the developer of magnetic blade (blade) disposes electromagnet at upstream side relatively, tackle mutually at the energising amount of electromagnet with surrounding environment and to control, the magnetic force that magnetic blade is responded to changes, thus, and the bed thickness (for example with reference to TOHKEMY 2005-106874 communique) of control toner.

In addition, the described developing apparatus of TOHKEMY 2005-134774 communique, sleeve (sleeve) sense of rotation upstream side at layer-thickness restriction member, at least formed the magnet of the S utmost point and two magnetic poles of the N utmost point with the face-to-face configuration of turnbarrel, and in the mode of a magnetic pole homopolarity of the magnetic pole that when developing, makes fixing magnetic roller and magnet, the configuration magnet limits the toner influx at the layer-thickness restriction member side.

When non-the development, magnet rotation on the sense of rotation of regulation is driven,, make to be formed at and the fixedly variation of the Distribution of Magnetic Field between the magnetic roller, apply vibration so that the toner condensation product is decomposed to the toner condensation product by the rotation of magnet.Thus, prevented to be blocked in the gap between turnbarrel and the layer-thickness restriction member and the image deflects that cause based on the toner condensation product.

Patent documentation 1: TOHKEMY 2005-106874 communique

Patent documentation 2: TOHKEMY 2005-134774 communique

In the described developing apparatus of TOHKEMY 2005-106874 communique, have following problem: because electromagnet has coil, so toner fills up coil easily, can not take out developer fully when replacing developer.In addition, because coil constantly contacts with higher pressure with developer, therefore the easy deterioration of coil, needs continually more emat coil, is difficult to keep its performance.And owing to electromagnet being set, so there is the problem that electromagnet maximizes, complex structure needs cost at whole developer carrier bearing of trend.

In addition, in the described developing apparatus of TOHKEMY 2005-134774 communique, the setting by magnet and the rotation of magnet limit the toner influx at the layer-thickness restriction member side.Such formation, on near the toner condensation product the decomposition layer-thickness restriction member is resultful, but, do not consider at the agitation characteristics of the new supply in the developing trough with toner, therefore, under the situation of the higher original copy of long-time continuous ground output typewriting rate, can produce the bad problem of image along with the reduction of agitation characteristics.

Summary of the invention

Therefore, the objective of the invention is to, provide a kind of can with simple formation will the amount of requirement developer be transported to the developing apparatus and the image processing system of picture supporting body.

The electrostatic latent image that developing apparatus of the present invention will be formed at as supporting body uses two-component developing agent to develop, it is characterized in that, have: developer carrier, this developer carrier has: development sleeve, rotatably be provided with around the first axle that is predetermined, and carry two-component developing agent to the conveying of picture supporting body, and the magnetic roller, be arranged in the development sleeve, produce magnetic; Layer-thickness restriction member is provided with opposed to each other with development sleeve, is used to limit the bed thickness of the two-component developing agent that development sleeve carries; The magnetic production part at the upstream side that also is in the sense of rotation of above-mentioned development sleeve than above-mentioned layer-thickness restriction member, can be provided with displacement with development sleeve is opposed, produces magnetic; And control part, control the displacement of the above-mentioned relatively development sleeve of above-mentioned magnetic production part.

According to the present invention, developing apparatus constitutes, and has: developer carrier, and carrying two-component developing agent (below be sometimes referred to as " developer "), and carry to the picture supporting body; Layer-thickness restriction member, the bed thickness of restriction developer; The magnetic production part produces magnetic; Control part, the displacement of the relative development sleeve of control magnetic production part.Developer carrier rotatably is provided with around first axle, and has development sleeve and be arranged at the magnetic roller that is used to produce magnetic in the development sleeve.Utilize this magnetic roller, can be with the surface of developer carrying at development sleeve, and to the agent of picture supporting body supplying developing.Than layer-thickness restriction member also near the upstream side of the sense of rotation of development sleeve, with the opposed magnetic production part that is provided with of development sleeve movablely.Because the magnetic production part produces magnetic, so, can control the bed thickness of the developer that development sleeve carried according to this magnetic.Because the displacement of the relative development sleeve of control part control magnetic production part, so, can control of the influence of magnetic production part to the magnetic of development sleeve generation by this displacement of control.Thereby, can control amount by the developer between magnetic production part and the development sleeve.Thus, utilize the layer-thickness restriction member in the sense of rotation downstream that is positioned at the magnetic production part, the bed thickness of developer can be limited in reliably the bed thickness of requirement.Thus, also can control the amount of movement of developer to the picture supporting body.Thereby, can with simple formation realize will the amount of requirement toner be transported to the developing apparatus of picture supporting body.

In addition, in the present invention, preferred above-mentioned magnetic production part constitutes at least can carry out displacement in the horizontal direction, and above-mentioned control part is controlled above-mentioned magnetic production part displacement in the horizontal direction.

According to the present invention, the magnetic production part constitutes, and is movable at least in the horizontal direction, by control module magnetic production part displacement in the horizontal direction controlled.

Each surperficial magnetic force of the magnetic pole of distance, magnetic production part and afore mentioned rules between the magnetic pole of the regulation by suitable adjustment magnetic production part and magnetic roller, can utilize the repulsion magnetic force that between the magnetic pole of the magnetic pole of magnetic production part and magnetic roller, produces, the amount of the developer that moves to the top of mixing component from the development sleeve surface is adjusted.

On the other hand, the toner that resupplies in the developing trough is used, be set to fall from the top of mixing component, therefore the toner used of developer that moves by development sleeve and the supply that falls, roughly meet, and the toner and the developer that utilize mixing component that above-mentioned supply is used mix, stir in same place.

By making the magnetic production part carry out displacement, the control performance of magnetic force changes, and particularly by making its top offset in the horizontal direction, and makes variable in distance between magnetic production part and the development sleeve, can improve control performance, can realize accurate control.

In addition, in the present invention, preferred above-mentioned magnetic production part has: form the cylindrical body of tubular, can carry out angular displacement ground around second axis that is predetermined and be provided with;

Magnetic pole formation portion is in the inboard of above-mentioned cylindrical body, forms magnetic poles in a plurality of positions of the circumferencial direction of cylindrical body,

Above-mentioned control part is controlled around the angular displacement of second axis above-mentioned cylindrical body.

In addition, according to the present invention, the magnetic production part has: cylindrical body can produce angular displacement ground around second axis and be provided with; Magnetic pole formation portion is in the cylindrical body inboard, forms magnetic poles in a plurality of positions of the circumferencial direction of cylindrical body.Control module is controlled around the angular displacement of second axis cylindrical body.Control module is controlled by the diagonal displacement amount, can make the part that produces optimum magnetic in a plurality of magnetic poles opposed with development sleeve.Thus, can control the magnetic force that the developer load is held between body and the layer-thickness restriction member.In addition, the inboard owing to magnetic pole formation portion being arranged at cylindrical body can prevent that developer is attached to magnetic pole formation portion, becomes do not require such.Thereby, do not worry taking place because the situations such as obstruction of the developer that causes of magnetic production part, even the more developing performance that yet can play stably of development number of times.In addition, by one side spin magnetization production part it is moved in the horizontal direction, can be according to the characteristic and the environment for use of developer, critically adjust, control the amount of the developer that moves by development sleeve and the position of meeting with toner with supply, so, can obtain the agitation characteristics of optimum developer.

And in the present invention, preferred magnetic production part is in the length of first axle bearing of trend and the developer carrier equal in length at the first axle bearing of trend.

According to the present invention, the magnetic production part is in the length of first axle bearing of trend and the developer carrier equal in length at the first axle bearing of trend.Thus, can hold the Zone Full of the developing regional of body in the developer load, to controlling by the amount of the developer between magnetic production part and the development sleeve.Thereby, can carry on a shoulder pole the Zone Full that hold body at developer, eliminate the deviation that load is held the amount of developer.Thus, can realize uniform development.

And in the present invention, preferred magnetic production part is longer in the length of first axle bearing of trend than developer carrier in the length of first axle bearing of trend.

According to the present invention, it is long in the length of first axle bearing of trend that the magnetic production part is held body in the length of first axle bearing of trend than the developer load.Because the magnetic properties that the both ends magnetic production part of magnetic production part is produced, the central portion control ability reduction of the amount of movement of developer sometimes relatively, so hold under the identical situation of the length of body in the length of magnetic production part and developer load, the amount of the developer of the end of developing regional might be different with central portion.To this, the present invention, it is long that the length by making the magnetic production part is held body than the developer load, can make the amount of developer of the end of developing regional and central portion equal.Thereby, carry on a shoulder pole the Zone Full of holding body at developer, the deviation that can make load hold the amount of developer is eliminated.Thus, can realize uniform development

And in the present invention, preferred above-mentioned control part based on the toner concentration that concentration detects, is controlled the displacement of above-mentioned magnetic production part, and this concentration is used to detect the toner concentration of the image that is developed by the picture supporting body.

According to the present invention, control part is controlled the displacement of above-mentioned magnetic production part based on the toner concentration that concentration detects, and this concentration is used to detect the toner concentration of the image that is developed by the picture supporting body.Thus, can based on the toner concentration of real-time detection, the operational throughput of developer be controlled according to the deterioration of environmental turbulence and developer.Thus, can be in real time the operational throughput of developer be controlled to reach the operational throughput of optimum developer.

And in the present invention, the surfaceness of preferred above-mentioned magnetic production part is different with the surfaceness of above-mentioned development sleeve.

According to the present invention, the surfaceness of magnetic production part is different with the surfaceness of development sleeve.By like this, make the magnetic production part differently with surfaceness development sleeve, can make the surface of two parts carry on a shoulder pole the amount difference of holding mobile developer.Thereby for example, the rough surface of the surface ratio magnetic production part by making development sleeve can make the operational throughput of the developer that development sleeve carries increase, so can set the transport capacity of developer bigger than magnetic production part.Thus, the amount of holding the developer of body conveying with the developer load can be set in required amount.

And in the present invention, the diameter of preferred above-mentioned cylindrical body is littler than the diameter of above-mentioned development sleeve.

According to the present invention, the diameter of cylindrical body is littler than the diameter of development sleeve.Thus, can make the developing apparatus integral miniaturization.

And, in the present invention, the diameter of preferred above-mentioned cylindrical body and the equal diameters of above-mentioned development sleeve.

According to the present invention, the diameter of cylindrical body and the equal diameters of development sleeve.Thereby, can make cylindrical body and development sleeve universalization, and can reduce cost.

And in the present invention, preferably at the magnetic force that is had with the magnetic roller opposed position of above-mentioned magnetic production part, in the above-mentioned development sleeve, it is big to be set at the magnetic force that is had than the magnetic production part with the opposed position of development sleeve.

According to the present invention, the magnetic force that will be had with the magnetic roller opposed position of magnetic production part, in the development sleeve, it is big to be set at the magnetic force that is had than the magnetic production part with the opposed position of development sleeve.Thereby, can prevent that holding the developer that the body load holds by developer load is held by magnetic production part load, and undesirable situation takes place.Thus, can prevent that holding body by developer load is carried on a shoulder pole the quantitative change of the developer of holding and get very fewly, and can hold the body conveying with developer to the picture load reliably.

And the present invention is an image processing system, it is characterized in that, has above-mentioned developing apparatus.

And according to the present invention, image processing system has above-mentioned developing apparatus, so, can realize reaching the image processing system of above-mentioned optimal effectiveness.

Description of drawings

Purpose of the present invention, characteristics and advantage will be clearer and more definite according to following detailed description and accompanying drawing.

Fig. 1 is the front view of the developing apparatus of simple expression first embodiment of the present invention.

Fig. 2 is simple expression is suitable for the image processing system of example as one of developing apparatus a front view.

Fig. 3 is a sectional view of simply representing magnetic production part and developer roll.

Fig. 4 A and Fig. 4 B be used to illustrate and developer roll and magnetic production part between the front view of magnetic correlationship.

Fig. 5 is the block diagram of the simple expression electric formation relevant with the magnetic production part.

Fig. 6 is a sectional view of simply representing the magnetic production part.

Fig. 7 is the front view of the magnetic production part of simple presentation graphs 6.

Fig. 8 is a sectional view of simply representing an example of slide displacement portion.

Fig. 9 is another routine sectional view of simply representing slide displacement portion.

Figure 10 A and Figure 10 B are the figure that is used to illustrate the action of slide displacement portion.

Figure 11 is simple another routine sectional view again that amplifies expression slide displacement portion.

Figure 12 A and Figure 12 B are the figure of the action of explanation slide displacement portion.

Figure 13 is the front view of the developing apparatus of simple expression the 3rd embodiment of the present invention.

Figure 14 is the front view of the developing apparatus of simple expression the 4th embodiment of the present invention.

Figure 15 A～Figure 15 D is the front view that amplifies the surface of the surface of expression cylindrical body and development sleeve.

Among the figure: the 1-developing apparatus; The 2-image processing system; The 8-photoconductor drum; The 17-developer roll; The 20-layer-thickness restriction member; 22-magnetic production part; The 23-control part; The 27-development sleeve; 28-magnetic roller; The 34-cylindrical body; 35-magnetic pole formation portion; 40-slide displacement portion.

Embodiment

Below, describe being used to implement a plurality of mode of the present invention with reference to accompanying drawing.To in each mode with previously described mode in the item corresponding components that has illustrated be marked with same reference marks, omit the explanation of its repetition sometimes.Under situation an about only part that constitutes being described, other parts of establishing formation are identical with the mode of explanation in advance.The not combination of the part that just in each embodiment, specifies, if particularly make up no problem, also can be partly with the embodiment combination with one another.

Fig. 1 is the front view of the developing apparatus 1 of simple expression first embodiment of the present invention.Fig. 2 is simple expression is suitable for the image processing system 2 of example as one of developing apparatus 1 a front view.The image processing system 2 of present embodiment utilizes the coloured image of dry type electrophotographic mode to form device 2 and realizes.The view data that image processing system 2 for example sends based on each end device from network etc. are at the recording chart 3 formation polychromes or the monochromatic image of regulation.Image processing system 2 has: but four videos form unit 4Y, 4M, 4C, 4B (following be generically and collectively referred to as sometimes " but video formation unit 4 "), recording chart delivery section 5, fixing device 6 and supply tray 7.

Supply tray 7 can put many recording charts 3, and a plurality of recording charts 3 that supply tray 7 is put separate one by one, but offers the video formation unit 4Y of the most close supply tray 7 sides.

But each video forms unit 4, and is corresponding with yellow (Y), pinkish red (M), cyan (C) and four kinds of colors of black (B) respectively, forms unit 4Y, 4M, 4C, 4B but be arranged side by side four videos.But video forms unit 4Y uses yellow (Y) toner T to carry out image formation; But video forms unit 4M uses pinkish red (M) toner T to carry out image formation; But video forms unit 4C uses cyan (C) toner T to carry out image formation; But video forms unit 4B uses black (B) toner T to carry out image formation.As concrete configuration, the transport path along the recording chart 3 of the supply tray 7 of linkage record paper 3 and fixing device 6 forms unit 4, is so-called tandem but set four videos.

But each video forms unit 4 has the identical structure of essence respectively, and each is provided with developing apparatus 1, photoconductor drum 8, charged device 9, laser irradiating part 10, transfer roll 11 and cleaner unit 12.But each video forms unit 4 overlapping being needed on from supply tray 7 of each colour toners T multilayer is transported on the recording chart 3.

Photoconductor drum 8 is used to carry formed image.Charged device 9 is used to make the current potential uniform charged of the surface of photoconductor drum 8 with regulation.Laser irradiating part 10 is according to the view data that is input to image processing system 2, makes to utilize charged device 9 and the face exposure of charged photoconductor drum 8, and forms electrostatic latent image on the surface of this photoconductor drum 8.The electrostatic latent image that developing apparatus 1 will form on the surface of photoconductor drum 8 utilizes toner T of all kinds to develop.Transfer roll 11 has applied the bias voltage with toner T opposite polarity, with formed toner as transfer printing on the recording chart of carrying by recording chart delivery section described later 53.After rousing the development treatment of cleaner unit 12 in developing apparatus 1 and being formed at the image transfer printing of photoconductor drum 8, the toner T that will residue in the surface of photoconductor drum 8 removes, regains.More than the transfer printing of this toner picture at recording chart 3, repeat four times for four looks.

Recording chart delivery section 5 has driven roller 13, idler roller 14 and conveying belt 15, and the recording chart 3 that provides from supply tray 7 is provided, but forms the toner picture so that utilize video to form unit 4 on recording chart 3.Driven roller 13 and idler roller 14 are used for conveying belt 15 tensionings with sealing, with the rotation of predetermined circumference speed, make conveying belt 15 rotations of sealing by controlling and driving roller 13.Conveying belt 15 produces static at outer surface, on one side static sorption recording chart 3, feeding recordable paper on one side.

Recording chart 3, on one side be transferred like this be with 15 to carry transfer printing toner pictures after, peel off from conveying belt 15 owing to the curvature of driven roller 13, be transported to fixing device 6.Fixing device 6 provides suitable heat and pressure to recording chart 3, makes toner T dissolving and is fixed on the recording chart 3, thus, forms firm firm image.

Below, with reference to Fig. 1 the formation of developing apparatus 1 is described.Developing apparatus 1 comprises: developer container 16, developer roll 17, paddle (paddle) 18, agitating roller 19, layer-thickness restriction member 20, exhaust portion 21, magnetic production part 22, control part 23 (with reference to Fig. 5).Developer container 16, it for example is the container-like component that forms by synthetic resin etc., developer roll 17, paddle 18, agitating roller 19 and layer-thickness restriction member 20 are accommodated in the portion space within it, and have accommodated the two-component developing agent that contains toner T and carrier (below, be sometimes referred to as " developer ").In the side near photoconductor drum 8 of developer container 16, formed parallel and opening 24 that extend with the axis direction of photoconductor drum 8.In addition, on the wall of the developer container above the vertical direction of agitating roller 19 16, formed developer receiving port 25.Above the vertical direction of developer receiving port 25, be provided with developer funnel (not shown).

The developer funnel is arranged to be connected with the toner replenishing mouth (not shown) that is formed at developer funnel vertical direction bottom with developer receiving port 25.Thus, the inner space of the inner space of developer container 16 and developer funnel is communicated with.The developer funnel for example is the container-like component that is formed by synthetic resin etc., and the portion space stores toner T within it.In the developer funnel, store toner T, pass through developer receiving port 25 supply toner T in developer container 16 according to the consumption situation of the toner T in the developer container 16.In addition, exhausr port 26 is formed at the wall of developer container 16 of the vertical direction below of developer roll 17.For the function of exhausr port 26 in aftermentioned.

Agitating roller 19 will stir to the toner T that developer container 16 provides from the developer funnel according to the consumption situation of toner T, carry around paddle 18 with uniform state.Agitating roller 19 to be provided with across paddle 18 and developer roll 17 opposed modes, for example is the screw shaped roller member that is freely supported by developer container 16 rotations.

Paddle 18 will be stirred conveying and provide to developer roll 17 by the developer that agitating roller 5 is carried.Paddle 18 for example is to rotate the roller member that freely supports around axis by developer container 16 to be provided with across developer roll 17 and photoconductor drum 8 opposed modes.Because the rotation of paddle 18, with developers in the developer container 16 offer developer roll 17 around, and form developer layer on the surface of developer roll 17.

Developer roll 17 is developer carriers, and it has: development sleeve 27, rotatably be provided with around the first axle L1 that is predetermined, and the carrying two-component developing agent is also carried to photoconductor drum 8; And magnetic roller 28, be arranged in the development sleeve 27, produce magnetic.Developer roll 17 for example is by being formed at the opening 24 of developer container 16 in the face of photoconductor drum 8, and photoconductor drum 8 has the gap and isolates relatively, and the roller member that is provided with in the axis of photoconductor drum 8 mode parallel with the first axle L1 of developer roll 17.Development sleeve 27 is to rotate the freely outer cartridge that is embedded in magnetic roller 28, and present embodiment is a cylinder-like part.Development sleeve 27 is for example formed by metals such as aluminium and stainless steels.Provide voltage from power supply (not shown) to development sleeve 27, so that and produce potential difference (PD) between the photoconductor drum 8.

Magnetic roller 28 is set to be built in the development sleeve 27 and fixes, and forms magnetic pole in the inboard of development sleeve 27.Magnetic roller 28 is with roughly alternately in the mode of the different magnet component of circumferencial direction configuration magnetic pole and form.In the present embodiment, magnetic roller 28 uses permanent magnets such as ferrite, and has 7 magnetic poles of S1, N1, S2, N3, S4, S3 and N2.

Development sleeve 27, an end of axis direction are with towards the paper of Fig. 1 and anti-clockwise mode utilizes drive division 29 (with reference to Fig. 3) in the rotation of arrow A direction, and the other end is for example supported by sliding bearing 30.Development sleeve 27 and photoconductor drum 8 between near formed developing regional of portion (development roll gap (nip) portion) and photoconductor drum 8 equidirectional rotations.Just, the sense of rotation around axis L1 of development sleeve 27 is opposite with the sense of rotation around axis of photoconductor drum 8.After, for the purpose of simplifying the description, sometimes the sense of rotation of development sleeve 27 is called the sense of rotation of developer roll 17.Developer roll 17 is because the magnetic force of the magnetic pole that magnetic roller 28 forms and magnetic adheres to carrier, and is that the surface element in the radial direction outside forms the magnetic paintbrush (brush) that is made of carrier and toner T in the outer circumferential surface section of development sleeve 27.The magnetic paintbrush forms along the magnetic field of radiating from magnetic roller 28 formed magnetic poles.Developer roll 17 by making development sleeve 27 to arrow A direction rotation, to the most approaching opposed the roll gap portion supplying developing agent of promptly developing of developer roll 17 and photoconductor drum 8, and provides the T of the toner in the magnetic paintbrush to the surface element of photoconductor drum 8.

Layer-thickness restriction member 20, opposed and be provided with development sleeve 27, and the bed thickness of the developer that development sleeve 27 is carried limits.Utilize this layer-thickness restriction member 20 bed thickness of developer to be adjusted to the value of requirement.Layer-thickness restriction member 20 is thin-plate members, and is arranged to, and a end that will shorter direction is installed on developer container 16, and the other end becomes free end and has the gap with developer roll 17 surfaces and isolate, the developer layer butt that carries with developer roll 17 surfaces.Isolation distance W1 between layer-thickness restriction member 20 and the developer roll 17 is the developer roll 17 of radial direction of developer roll 17 and the bee-line between the layer-thickness restriction member 20.Isolation distance W1 for example is below the above 1.0mm of 0.5mm.For layer-thickness restriction member 20, for example can use the thin plate that forms by nonmagnetic resilient material.As not restriction especially of resilient material, still, can exemplify rubber-like metal (stainless steels of aluminium, SUS316 etc.), rubber-like synthetic resin etc.In addition, in order to reach more high image quality, the layer-thickness restriction member 20 that also can use magnetic stainless steel such as SUS430 to form.The developer of the ormal weight by the gap between layer-thickness restriction member 20 and the developer roll 17 utilizes the rotation of developer roll 17 and is transported to development roll gap portion.

Air in the exhaust portion 21 sucking-off developer containers 16 is also discharged to the outside.Exhaust portion 21 comprises exhausr port 26, extraction fan 31, exhaust manifolds 32.Extraction fan 31 is arranged at and developer roll 17 opposed positions at the wall of vertical direction across developer container 16.Extraction fan 31 is by exhausr port 26 and exhaust manifolds 32, attracts the air in the developer container 16 and discharges to the outside of developer container 16.Thus, developer container 16 inside become negative pressure, outer gas can be imported in developer container 16 from opening 24.Exhausr port 26, the wall of the developer container below the vertical direction of developer roll 17 16 all the time is with the opening of band shape parallel with the axis L1 of developer roll 17 and that form to the mode of extending than length direction of developer container 16.Exhausr port 26 also is to form abreast.Exhausr port 26 is to be used for and will to import to the path that developer container 16 interior extraneous gas are discharged to the outside of developer container 16 from opening 24.Exhaust manifolds 32 are arranged at the outside with the approaching developer container 16 of exhausr port 26, the temporary transient air of discharging from exhausr port 26 that stores.Utilize exhaust portion 21, pass through opening 24 leaked-in air in developer container 16 from the gap between photoconductor drum 8 and the developer container 16, flow through developer roll 17 around, enter exhaust manifolds 32 by exhausr port 26 after, be discharged to the outside of developer container 16 by extraction fan 31.Owing to flow through the air of the air flow circuit in the developer container 16, be set at filtrator (not shown) dedusting in this stream, so also can directly discharge to the outside of developer container 16.

Fig. 3 is a sectional view of simply representing magnetic production part 22 and developer roll 17.With reference to Fig. 1, magnetic production part 22 is described in the lump.In Fig. 3,, and magnetic production part 22 and developer roll 17 are separately represented in addition for easy understanding.Than layer-thickness restriction member 20 also near the sense of rotation upstream side of development sleeves 27, with opposed and magnetic production part 22 can be set with displacement with development sleeve 27.Above vertical direction is also leaned on, magnetic production part 22 is set than developer horizontal line 33 near the position of paddle 18.Magnetic production part 22 has: form the cylindrical body 34 of tubular, can carry out angular displacement ground around the second axis L2 that is predetermined and be provided with; Magnetic pole formation portion 35 is in the inboard of cylindrical body 34, forms magnetic poles in a plurality of positions of the circumferencial direction of cylindrical body 34.

Cylindrical body 34 for example forms cylindric in the present embodiment.Cylindrical body 34 be not limited to this cylindric also can be polygon-shaped.Cylindrical body 34 relative development sleeves 27 have the gap and isolate, and are arranged to, and the axis L1 of development sleeve 27 is parallel with the axis L2 of cylindrical body 34.Select the bee-line W2 between the outer circumference surface of the outer circumference surface of cylindrical body 34 and development sleeve 27 according to the bed thickness of the developer that development sleeve 27 carried and the magnetic force of magnetic production part 22 etc., for example set for below the above 10mm of 5mm.With the freely outer magnetic pole formation portion 35 that is embedded in of cylindrical body 34 rotations.Cylindrical body 34 is for example formed by metals such as aluminium and stainless steels.The diameter of cylindrical body 34 is set for littler or equal than the diameter of development sleeve 27.In the present embodiment, the diameter of cylindrical body 34 is set for littler, for example set the diameter of cylindrical body 34 for 10mm, set the diameter of development sleeve 27 for 30mm than the diameter of development sleeve 27.Littler by like this diameter of cylindrical body 34 being set for than the diameter of development sleeve 27, can be with developing apparatus 1 integral miniaturization.

Magnetic pole formation portion 35 is configured to, and is built in cylindrical body 34 and can carries out angular displacement around the axis of cylindrical body 34, forms magnetic pole in the inboard of cylindrical body 34.Magnetic pole formation portion 35 is roughly alternately to form at the circumferencial direction configuration different magnet component of magnetic pole.In the present embodiment, magnetic pole forms parts 35, has for example used by ferrite, by the permanent magnet that aluminium nickel cobalt and terres rares etc. form, and has: magnetic pole and the magnetic pole with polarity of three S utmost points with polarity of two N utmost points.As shown in Figure 1, the pole configuration that will have the polarity of the N utmost point becomes to be positioned on the line segment of rotation center of the rotation center that connects development sleeve 27 and cylindrical body 34.In addition, magnetic pole being formed at least one magnetic pole in five magnetic poles of portion 35, to set the magnetic force that is had than the magnetic roller 28 with magnetic production part 22 opposed positions for little.Thereby, carry out angular displacement by making magnetic pole formation portion 35, the magnetic force that the magnetic roller 28 with magnetic production part 22 opposed locations is had, the magnetic force that is had than the magnetic pole formation portion 35 with development sleeve 27 opposed locations is big.Magnetic pole formation portion 35 constitutes, and an end of axis direction is utilized magnetic pole formation portion drive division 36, can carry out angular displacement with the angular displacement that requires.Magnetic pole formation portion drive division 36 is for example realized by stepping motor.

End with the axis direction of cylindrical body 34 utilizes drive division 29, for example drives to the rotation of arrow B direction in the mode that turns clockwise towards the paper of Fig. 1.The sense of rotation of this cylindrical body 34 can be that to turn clockwise also can be inhour rotation.The sense of rotation of this cylindrical body 34 suitably determines according to the balance of the integral body of the surface configuration of development sleeve 27 and cylindrical body 34, magnetic force and distance etc.In addition, cylindrical body 34 is constituted, can come transmission of drive force by utilizing gear mechanism to link to be used to the drive division 29 that drives development sleeve 27.By such formation, can utilize a drive division 29 to drive development sleeve 27 and cylindrical body 34, can make to constitute and oversimplify.

In addition, in the present embodiment, as shown in Figure 3, the length W3 of the magnetic production part 22 of first axle L1 bearing of trend sets each size in the mode longer than the length W4 of the developer roll 17 of first axle L1 bearing of trend.

Fig. 4 A and Fig. 4 B be used to illustrate and developer roll 17 and magnetic production part 22 between the front view of magnetic correlationship.Carried and amount by the developer between development sleeve 27 and the cylindrical body 34 by development sleeve 27, the magnetic force distribution that portion 35 forms is relevant with being formed by magnetic roller 28 and magnetic pole.For example, as shown in Fig. 4 A, the magnetic pole of left magnetic roller 28 is N utmost points, and the magnetic pole that is positioned at the magnetic pole formation portion 35 of developer roll 17 closest-approach distances also is under the situation of the N utmost point, owing to repel mutually, the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 diminishes.In this case, the carrying capacity of developer diminishes, and is little by the quantitative change of the developer between development sleeve 27 and the cylindrical body 34.

From the state shown in Fig. 4 A, make magnetic pole formation portion 35 carry out angular displacement around axis L2, shown in Fig. 4 B, the magnetic pole of left magnetic roller 28 is N utmost points, the magnetic pole that is positioned at the magnetic pole formation portion 35 of developer roll 17 closest-approach distances is under the situation of the S utmost point, owing to attract each other, it is big that the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 becomes.In this case, it is big that the carrying capacity of developer becomes, many by the quantitative change of the developer between development sleeve 27 and the cylindrical body 34.Thereby,, can control carrying capacity based on the developer of developer roll 17 by the angular displacement of control magnetic pole formation portion 35.

In addition, the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 is brought influence to the size of the magnetic flux density between magnetic pole formation portion 35 self and the magnetic roller 28 self.If it is big that the magnetic force between magnetic roller 28 and the magnetic pole formation portion 35 becomes, it is big that the carrying capacity of developer becomes, then at the pressure grow of developer, so the carried charge of developer uprises.Thereby magnetic production part 22 has the effect of the carried charge of control developer.

Fig. 5 is the block diagram of the electric formation that is associated with magnetic production part 22 of simple expression.Distance between 23 pairs of magnetic production parts 22 of control part and the development sleeve 27 is controlled.Control part 23 in the present embodiment, is controlled the angular displacement around axis L2 of cylindrical body 34.Control part 23 is controlled the angular displacement of magnetic production part 22 according to the toner concentration that utilizes concentration 37 to be detected, and this concentration 37 is used for the toner concentration that utilizes photoconductor drum 8 to be developed is detected.Thus, magnetic production part 22, according to the measurement result control in the small pieces on the photoconductor drum 8 (patch) zone and the magnetic force between the developer roll 17, and the toning dosage that subtend layer-thickness restriction member 20 provides controls, to owing to around the change of the development that causes of humiture environment and developer degradation control.

Concentration 37 is for example by carrying out infrared light-struck light-emitting component 38 to photoconductor drum 8, receiving catoptrical photo detector 39 realizations from the infrared light of photoconductor drum 8.Thereby the light from light-emitting component 38 sends by the reflection of the toner picture on the photoconductor drum 8, and utilizes photo detector 39 to detect this light.Control part 23, the value according to photo detector 39 is detected provides driving command to magnetic pole formation portion drive division 36.Thus, utilize magnetic pole formation portion drive division 36, make magnetic pole formation portion 35 for example carry out angular displacement from spending to 180 several times around axis.

In the developing apparatus 1 that has used two-component developing agent,, and during necessarily, reuse carrier along with image forms and consume toner T.Carrier bears various stress and deterioration during reusable.If developer produces deterioration like this, the flowability of developer degenerates, and the charging property of developer also degenerates, so the toner concentration step-down on the photoconductor drum 8.Control part 23 if the toner concentration step-down then provides driving command to magnetic pole formation portion drive division 36, for example, shown in Fig. 4 B, is controlled the angular displacement of magnetic pole formation portion 35, so that the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 becomes big.Thus, can become big by the carrying capacity that makes developer, and the toner concentration on the photoconductor drum 8 is increased, control in the mode that meets the requirements of toner concentration.In addition, control part 23, if because environmental change, for example how wet high temperature is, and cause that the carried charge of toner T reduces, and the toner concentration on the photoconductor drum 8 uprises, then provide driving command to magnetic pole formation portion drive division 36, for example shown in Fig. 4 A, the angular displacement of magnetic pole formation portion 35 is controlled, so that the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 diminishes.Thus, can the carrying capacity of developer be diminished by control, the toner concentration on the photoconductor drum 8 reduces, and comes to reach desired toner concentration.In addition, control part 23, if owing to environmental change for example low temperature and low humidity cause that the carried charge of toner T uprises, toner concentration on the photoconductor drum 8 reduces, then provide driving command to magnetic pole formation portion drive division 36, for example shown in Fig. 4 B, so that the mode that the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 increases is controlled the angular displacement of magnetic pole formation portion 35.Thus, can be by passing through so that the carrying capacity of developer become big, the toner concentration on the photoconductor drum 8 increases, and comes to reach desired toner concentration.

Control part 23 in order as described above the angular displacement of magnetic pole formation portion 35 to be controlled, is controlled according to data map (data map) the diagonal displacement amount of storage in advance.In data map, in advance relation between angular displacement and the toner concentration and surrounding environment are set up relatedly, according to carrying capacity of environment that is detected and toner concentration, easily what kind of angular displacement optimum the storage of retrieval ground takes.Control part 23 by using such data map, can shorten the computing time of displacement, in real time magnetic production part 22 is controlled based on toner concentration.

As described above like that, in the developing apparatus 1 of present embodiment, developing apparatus 1 constitutes to have: developer roll 17, the carrying two-component developing agent is also carried to photoconductor drum 8; Layer-thickness restriction member 20 limits the bed thickness of developer; Magnetic production part 22 produces magnetic; Control part 23 is controlled the displacement of magnetic production part 22.Developer roll 17 has: development sleeve 27, to be provided with around the rotatable mode of first axle L1; Magnetic roller 28 is arranged in the development sleeve 27, and produces magnetic.Utilize this magnetic roller 28, can be at the surface bears developer of development sleeve 27, and to photoconductor drum 8 supplying developing agent.Magnetic production part 22, than layer-thickness restriction member 20 also by the sense of rotation upstream side of development sleeve 27, be provided with development sleeve 27 is opposed movablely.Magnetic production part 22 is owing to produce magnetic, so can utilize the bed thickness of the developer that this magnetic carried development sleeve 27 to control.Because the displacement of 23 pairs of magnetic production parts of control part, 22 relative development sleeves 27 is controlled, so, can control to the influence of the magnetic of development sleeve 27 generations to magnetic production part 22 by carrying out the control of this displacement.Thereby, can be to controlling by the amount of the developer between magnetic production part 22 and the development sleeve 27.Thus, can utilize the layer-thickness restriction member 20 in the sense of rotation downstream that is positioned at magnetic production part 22, the bed thickness with developer is limited in desired bed thickness reliably.Thus, can control amount of movement at the developer of photoconductor drum 8.Thereby,, can realize the developing apparatus 1 that the toner of the amount of requirement can be carried to photoconductor drum 8 with simple formation.In addition, possess developing apparatus 1 as described above,, also can obtain the image processing system 2 of stable typewriting image even can provide a kind of humiture environment to change and developer generation deterioration by making image processing system 2.

In addition, in the present embodiment, owing to utilize drive division 29 pair cylindrical body 34 identical to be rotated driving with development sleeve 27, even so be attached at developer under the situation of cylindrical body 34, because this rotation can not kept the state that adheres to yet, repeating to break away from and adhere to, is not that institute is developed under the situation of agent covering with requiring so can prevent cylindrical body 34.Thus, may prevent the damage that magnetic production part 22 causes owing to developer adheres to, can make and safeguard easily.

In addition, in the present embodiment, magnetic production part 22 has: cylindrical body 34, can carry out the mode of angular displacement around the second axis L2 and to be provided with; Magnetic pole formation portion 35 is in cylindrical body 34 inboards, in a plurality of positions of the circumferencial direction of cylindrical body 34, forms magnetic pole.Control part 23 is controlled the angular displacement around the second axis L2 of cylindrical body 34.Control part 23 is controlled by the diagonal displacement amount, can the part that produce optimum magnetic in a plurality of magnetic poles is opposed with development sleeve 27.Thus, can control the magnetic force between developer roll 17 and the layer-thickness restriction member 20.In addition,, be attached to magnetic pole formation portion 35, become undesirable situation so can prevent developer because magnetic pole formation portion 35 is arranged at the inboard of cylindrical body 34.Thereby, do not worry generation, even the more developing performance that yet can play stably of development number of times owing to the situations such as obstruction of magnetic production part 22 caused developers.

In addition, in the present embodiment, with magnetic production part 22 be arranged at than developer horizontal line 33 also by vertical direction top, near the position of paddle 18.By like this magnetic production part 22 being arranged at position, can utilize the operational throughput of 22 pairs of developers of magnetic production part to control in the more position of amount of the developer that provides to developer roll 17 by paddle 18 near paddle 18.

And in the present embodiment, the length W3 of the magnetic production part 22 of first axle L1 bearing of trend is bigger than the length W4 of the developer roll 17 of first axle L1 bearing of trend.The both ends of magnetic production part 22, because the character of the magnetic that magnetic production part 22 is produced, the central portion control ability reduction of the amount of movement of developer sometimes relatively, so under the length W3 of magnetic production part 22 situation identical with the length W4 of developer roll 17, the amount of the developer of the end of possible developing regional is different with central portion.To this, the length W3 by making magnetic production part 22 among the present invention is longer than developer roll 17, and the amount of the developer of the end of developing regional and central portion is equated.Thereby, can the amount deviation of bearing developer be eliminated at the Zone Full of developer roll 17.Thus, can realize uniform development.

And, in the present embodiment, control part 23, the toner concentration of the image that detects according to concentration 37 displacement of magnetic production part 22 is controlled, and this concentration 37 is used to detect the toner concentration that is developed by photoconductor drum 8.Thus, can based on the toner concentration of real-time detection, the operational throughput of developer be controlled according to the deterioration of environmental turbulence and developer.Thus, can be in real time the operational throughput of developer be controlled to reach the operational throughput of optimum developer.

And, in the present embodiment, the magnetic force that will be had with magnetic roller 28 magnetic production part 22 opposed positions, in the development sleeve 27, it is big to set the magnetic force that is had than the magnetic production part 22 with development sleeve 27 opposed positions for.Thereby, do not carried by the developer of developer roll 17 carryings by magnetic production part 22, prevent undesirable situation.Thus, can prevent the very few situation of amount of the developer that is carried by developer roll 17, and can reliably developer be carried to photoconductor drum 8.

In addition, in the present embodiment, owing to the angular displacement of magnetic pole formation portion 35, the sense of rotation of magnetic attracting force and development sleeve 27 acts on the developer of being carried to layer-thickness restriction member 20 by developer roll 17 in reverse direction sometimes.Because these magnetic pole formation portion 35 caused magnetic attracting forces, the mobile effect of playing braking at the developer of the sense of rotation of development sleeve 27, so the speed of the developer the when developer that can make layer-thickness restriction member 20 and be detained dashes collision is little when magnetic production part 22 is not set.Thus, when the developer conflict of layer-thickness restriction member 20 and delay, can make from the developer applied pressure of developer and die down to layer-thickness restriction member 20 and delay, so, can make as its retroaction to diminish to the load that the developer that is transferred applies from layer-thickness restriction member 20 and the developer that is detained.Present embodiment like this can make the load that applies to developer diminish when the layer-thickness restriction member 20 and the developer conflict of being detained, and can suppress the deterioration of developer, suppress the deterioration of carrier in more detail, and suppress the deterioration of image.

In addition, in the present embodiment, the length setting of the magnetic production part 22 of first axle L1 bearing of trend is become longer than the length of the developer roll 17 of first axle L1 bearing of trend, but be not limited to this, also the length setting of the magnetic production part 22 of first axle L1 bearing of trend can be become equal in length with the developer roll 17 of first axle L1 bearing of trend.Thus, can be at the Zone Full of the developing regional of developer roll 17, to controlling by the amount of the developer between magnetic production part 22 and the development sleeve 27.Thereby, can eliminate the deviation of the amount of bearing developer at the Zone Full of developer roll 17.Can realize uniform development thus.In addition, can make developing apparatus 1 miniaturization.

In addition, in the present embodiment, the diameter of cylindrical body 34 is set for littler, still, be not limited to this, also can make the equal diameters of the diameter and the development sleeve 27 of cylindrical body 34 than the diameter of development sleeve 27.Thus, can make cylindrical body 34 and development sleeve 27 general on constituting, can reduce cost.

Below, the developing apparatus 1 of second embodiment of the present invention is described.Fig. 6 is a sectional view of simply representing magnetic production part 22A.Fig. 7 is a front view of simply representing magnetic production part 22A.In the present embodiment, the magnetic pole formation 35A of portion of the inside of magnetic production part 22A cylindrical body 34 and cylindrical body 34 setting is set to one.Thereby, carrying out angular displacement by cylindrical body 34 around axis L2, the magnetic pole formation 35A of portion also carries out angular displacement around the axis L2 of cylindrical body 34.In addition, the developing apparatus 1 of present embodiment constitutes, and also has slide displacement portion 40 (with reference to Fig. 8), and this slide displacement portion 40 is used to make the relative development sleeve 27 of the magnetic pole formation 35A of portion to carry out displacement along the glide direction C with the axis normal of cylindrical body 34.The magnetic pole formation 35A of portion since slide displacement portion 40 and relatively development sleeve 27 carry out displacement along glide direction C.

The magnetic pole formation 35A of portion is for example realized by permanent magnet.The magnetic pole formation 35A of portion is a prism, with the cross sectional shape of the virtual plane of axis normal be oblong-shaped.The shape of the magnetic pole formation 35A of portion is not limited to this, and for example the cross sectional shape with the virtual plane of axis normal also can be a square shape.Magnetic pole is formed the 35A of portion, and to be configured to axis parallel with the axis L1 of development sleeve 27.The magnetic pole formation 35A of portion in axis direction integral body, forms the S utmost point at the surface element with a side of the direction of axis normal, forms the N utmost point at the opposing party's surface element.Magnetic pole is formed side's side that the 35A of portion is disposed at the radial direction of cylindrical body 34.Magnetic pole is formed the 35A of portion be configured to, at the inboard configuration of the radial direction S utmost point, at the radial direction outside configuration N utmost point.

Control part 23, not according to around the mode that axis rotates all the time magnetic pole formation portion drive division 36 being controlled, but the angular displacement of magnetic production part 22A is controlled according to the toner concentration that detects by concentration 37 with the incorporate cylindrical body 34 of the magnetic pole formation 35A of portion.In addition, control part 23, the toner concentration that is detected according to concentration 37 to controlling with the slide displacement amount of the axis orthogonal directions of cylindrical body 34, and changes the distance of the relative development sleeve 27 of magnetic production part 22A.

27 that carried by development sleeve as described above, the amount by the developer between development sleeve 27 and the cylindrical body 34, the magnetic force distribution that the 35A of portion forms is relevant with being formed by magnetic roller 28 and magnetic pole.The magnetic pole of left magnetic roller 28 is N utmost points, and the magnetic pole that is positioned at the magnetic pole formation 35A of portion of developer roll 17 closest-approach distances also is under the situation of the N utmost point, owing to repelling mutually the magnetic flux density between magnetic pole formation 35A of portion and the magnetic roller 28 is diminished.In addition, in this case, along with the distance between magnetic production part 22A and the developer roll 17 diminishes, magnetic flux density further diminishes, thus the carrying capacity of developer diminish, little by the quantitative change of the developer between development sleeve 27 and the cylindrical body 34.

In addition, making the magnetic pole formation 35A of portion carry out angular displacement around axis L2, is N utmost points and make the magnetic pole of magnetic roller 28, and the magnetic pole that is positioned at the magnetic pole formation 35A of portion of developer roll 17 closest-approach distances is under the situation of the S utmost point, owing to attract each other, and make the magnetic flux density between magnetic pole formation 35A of portion and the magnetic roller 28 become big.In addition, in this case, adhere to the distance that makes between magnetic production part 22A and the developer roll 17 and diminish, it is big that magnetic flux density further becomes, so the carrying capacity of developer becomes greatly, makes by the quantitative change of the developer between development sleeve 27 and the cylindrical body 34 big.Thereby, control by angular displacement and slide displacement amount the magnetic pole formation 35A of portion, can control the carrying capacity of the developer of developer roll 17.

Fig. 8 is a sectional view of simply representing an example of slide displacement portion 40.This routine slide displacement portion 40 constitutes, and has: guide portion 41, with magnetic production part 22A along glide direction C channeling conduct; Push magnetic production part 22A press section 42 to the side of glide direction C; With spring members 43, apply spring force with the opposing party of magnetic production part 22A trend glide direction C.To cylindrical body 34, the driving force spindle unit 44 to cylindrical body 34 is transmitted from magnetic pole formation portion drive division 36 links coaxially with cylindrical body 34.Guide portion 41 constitutes, and spindle unit 44 is guided along glide direction C, in the present embodiment, the sliding eye that utilization is extended along glide direction C is realized, by spindle unit 44 was inserted sliding eye, in sliding eye, be directed, spindle unit 44 can be at the enterprising line displacement of glide direction C.

Press section 42 is for example realized by volute spring (solenoid), and spindle unit 44 is pushed, so that the both ends of the axis direction of spindle unit 44 are to the side of glide direction C, generation is based on the displacement from the slippage of the steering order of control part 23.Spring members 43 provides the opposing party's who makes spindle unit 44 trend glide direction C spring force, and so that spindle unit 44 applies spring force with the mode of pressing component 42 butts all the time.Thereby, press section 42, the spring force by antagonistic spring parts 43 applies pressing force, thus, spindle unit 44 can be configured in the position of defined.By such formation slide displacement portion 40, can make spindle unit 44 carry out displacement along sliding eye.Thus, the distance between magnetic production part 22A and the developer roll 17 is changed.

Fig. 9 is another routine sectional view of simply representing the 40A of slide displacement portion.Figure 10 A and Figure 10 B are the figure that is used to illustrate the action of the 40A of slide displacement portion.This routine 40A of slide displacement portion constitutes, and comprising: guide portion 41, with magnetic production part 22A along glide direction C channeling conduct; Cam part 45 is provided with spindle unit 44 butts; Angular displacement portion 47 makes cam part 45 carry out angular displacement around camshaft 46; With spring members 43, apply spring force with the opposing party of magnetic production part 22A trend glide direction C.Guide portion 41 constitutes, and spindle unit 44 is guided along glide direction C, in the present embodiment, the sliding eye that extends along glide direction C is set to guide portion 41, by spindle unit 44 was inserted sliding eye, in sliding eye, be directed, spindle unit 44 can be at the enterprising line displacement of glide direction C.

Cam part 45, can carry out the mode of angular displacement around the axis of the camshaft parallel 46 with the axis L2 of cylindrical body 34, be set at the axis direction both ends of camshaft 46, and its outer circumferential surface section is arranged to outer circumferential surface section butt with the axis direction both ends of spindle unit 44.Angular displacement portion 47 makes cam part 45 carry out angular displacement, and spindle unit 44 is pushed, so that the side of the both ends of the axis direction of spindle unit 44 trends glide direction C, and generation is based on the displacement from the slippage of the steering order of control part 23.Spring members 43 applies the spring force with the opposing party of spindle unit 44 trend glide direction C, and so that cam part 45 applies spring force with the mode of spindle unit 44 butts all the time.Thereby, shown in Figure 10 A, from disposed the state of cam part 45 in the mode of extending with the direction of glide direction C quadrature, make cam part 45 carry out angular displacement by utilizing angular displacement portion 47, can make the spring force of cam part 45 antagonistic spring parts 43 and apply pressing force to spindle unit 44.Thus, shown in Figure 10 B, can make spindle unit 44 carry out displacement, and spindle unit 44 is disposed at the position of defined to the side of glide direction C.By such formation slide displacement 40A of portion, can make spindle unit 44 carry out displacement along sliding eye.Thus, the distance between magnetic production part 22A and the developer roll 17 is changed.

Figure 11 is simple another routine sectional view again that amplifies the expression slide displacement 40B of portion.Figure 12 A and Figure 12 B are the figure that is used to illustrate the action of the 40B of slide displacement portion.The 40B of slide displacement portion that this is routine, glide direction C are not the directions with the axis quadrature of cylindrical body 34, but are the circular-arc direction of rotation center along the axis L1 with development sleeve 27.Thereby the 40B of slide displacement portion that this is routine is while make magnetic production part 22A keep the distance of regulation to carry out displacement along the periphery of development sleeve 27.The 40B of slide displacement portion that this is routine comprises: guide portion 41, with magnetic production part 22A along glide direction C channeling conduct; Cam part 45 is provided with spindle unit 44 butts; Angular displacement portion 47 makes cam part 45 carry out angular displacement around camshaft 46; With spring members 43, magnetropism production part 22A applies the opposing party's who makes its trend glide direction C spring force.Guide portion 41 constitutes, and spindle unit 44 is guided along glide direction C, in the present embodiment, the circular-arc sliding eye that extends along glide direction C is set to guide portion 41, by spindle unit 44 was inserted sliding eye, in sliding eye, be directed, spindle unit 44 can be at the enterprising line displacement of glide direction C.

Thereby, routine identical with above-mentioned other, from shown in Figure 12 A, having disposed the state of cam part 45, make cam part 45 carry out angular displacement by utilizing angular displacement portion 47, can make the spring force of cam part 45 antagonistic spring parts 43 and apply pressing force to spindle unit 44.Thus, shown in Figure 12 B, can make spindle unit 44 carry out displacement to the side of glide direction C, and spindle unit 44 is disposed at the position of defined along circular-arc sliding eye.By such formation slide displacement 40B of portion, can make spindle unit 44 carry out displacement along sliding eye.Thus, while magnetic production part 22A is changed along the distance that the periphery of development sleeve 27 keeps stipulating.By carrying out displacement along the periphery of magnetic production part 22A and development sleeve 27 like this, because the magnetic pole that magnetic roller 28 is correlated with circumferencial direction is different, so the magnetic flux density between magnetic production part 22A and the developer roll 17 is changed.Thus, can reach above-mentioned effect based on the variation of magnetic flux density.

Developing apparatus to the 3rd embodiment of the present invention describes below.Figure 13 is the front view of the developing apparatus 1 of simple expression the 3rd embodiment of the present invention.The developing apparatus 1 of present embodiment constitutes, and comprises magnet moving part 60, and this magnet moving part 60 is used to make the relative development sleeve 27 of the magnetic production part 22B enterprising line displacement of x in the horizontal direction.

Magnetic production part 22B is for example realized by permanent magnet.Magnetic production part 22B is a prism, with the virtual plane of axis normal in cross sectional shape be oblong-shaped.The shape of magnetic production part 22B is not limited to this, and for example the cross sectional shape with the virtual plane of axis normal also can be a square shape.22B is arranged to the magnetic production part, and is on the line L after the center line with the N2 magnetic pole of magnetic roller 28 prolongs, opposed with magnetic roller 28.22B is configured to the magnetic production part, is disposing the N utmost point with 28 opposed on magnetic roller, at its opposition side configuration S utmost point.

Control part, according to the toner concentration that utilizes concentration to detect, to the relative development sleeve 27 of magnetic production part 22B in the horizontal direction the displacement on the x control.

Magnet moving part 60, the formation that makes magnetic production part 22B carry out displacement in rectilinear direction gets final product, can use for example solenoid, oil pressure hydraulic cylinder, air air cylinder etc., control part, by regulating current value, oil pressure, air pressure, come the displacement at horizontal direction of magnetic production part 22B is controlled.

Carried and amount by the developer between development sleeve 27 and the magnetic production part 22B by development sleeve 27, depended on the magnetic force distribution that forms by magnetic roller 28 and magnetic production part 22B.The magnetic pole of left magnetic roller 28 is N utmost points, and the magnetic pole that is positioned at the magnetic production part 22B of magnetic roller 28 closest-approach distances also is the N utmost point, so owing to repel mutually, the magnetic flux density between magnetic production part 22B and the magnetic roller 28 diminishes.And in this case, along with magnetic production part 22B is moved in the horizontal direction, distance between magnetic production part 22B and the magnetic roller 28 is diminished, magnetic flux density further diminishes, so it is the carrying capacity of developer diminishes, little by the quantitative change of the developer between development sleeve 27 and the magnetic production part 22B.

To the toner that the resupplies in the developer container 16 is used be preestablished, the whereabouts, top from mixing component in the present embodiment, falls near the almost centre of paddle 18 and agitating roller 19.The toner that utilizes the supply of developer that development sleeve 27 moves and whereabouts to use meets in above-mentioned place roughly, by paddle 18 and 19 liang of mixing components of agitating roller, above-mentioned supply is mixed, stirs with developer with toner.

According to the direction that makes magnetic production part 22B carry out displacement, the control performance of magnetic force changes, but, especially by making its x top offset in the horizontal direction, and make variable in distance between magnetic production part 22B and the development sleeve 27, can control the amount of the developer that moves by development sleeve 27, so can realize and corresponding accurate stirring controls such as the amount of the toner of being supplied with, flowability.

For example, under the situation that the original copy of rate that height is typewrited is typewrited continuously, the toner replenishing amount also can be common several times, also can stir fully under these circumstances.Toner particle easily under the condition of aggegation, utilizes development sleeve to move by making than the more developer of common setting each other under the two external hot and humid environment, can improve stirring.

Below, the developing apparatus 1 of the 4th embodiment of the present invention is described.Figure 14 is the front view of the developing apparatus 1 of simple expression the 4th embodiment of the present invention.Present embodiment constitutes with the developing apparatus 1 of first embodiment shown in Figure 1 similar, just comprising difference on magnet moving part 60 this point, and this magnet moving part 60 is used to make the magnetic production part 22 relative development sleeves 27 enterprising line displacement of x in the horizontal direction.

In the present embodiment, carry out angular displacement by cylindrical body 34 around axis, magnetic pole formation portion 35 also carries out angular displacement around the axis of cylindrical body 34.In addition, by magnet moving part 60, make the magnetic production part 22 relative development sleeves 27 enterprising line displacement of x in the horizontal direction.

Magnetic pole formation portion 35 is for example realized by permanent magnet.Magnetic pole formation portion 35 is prisms, with cross sectional shape in the virtual plane of axis normal be oblong-shaped.The shape of magnetic pole formation portion 35 is not limited to this, for example with the virtual plane of axis normal in cross sectional shape also can be square shape.Magnetic pole is formed portion 35 be configured to, the parallel axes of axis and development sleeve 27.Magnetic pole formation portion 35 is in axis direction integral body, forms the S utmost point at the surface element with a side of the direction of axis normal, forms the N utmost point at the opposing party's surface element.Magnetic pole is formed side's side that portion 35 is disposed at the radial direction of cylindrical body 34.Magnetic pole is formed portion 35 be configured to, the S utmost point is in the radial direction inboard, and the N utmost point is in the radial direction outside.

Magnet moving part 60 is as long as the formation that can make magnetic production part 22B carry out displacement in rectilinear direction can be used for example solenoid and oil pressure hydraulic cylinder, air air cylinder etc.; Control part by regulating current value, oil pressure, air pressure, comes the displacement at horizontal direction of magnetic production part 22B is controlled.

Control part, not according to around the mode that axis rotates all the time magnetic pole formation portion drive division 36 being controlled, but the angular displacement of magnetic production part 22 is controlled according to the toner concentration that detects by concentration with magnetic pole formation portion 35 incorporate cylindrical body 34.In addition, control part is controlled magnet moving part 60, and according to the toner concentration that concentration detected, magnetic production part 22 relative development sleeves 27 is controlled at the displacement on horizontal direction x.

Above-mentioned like that 27 that carried by development sleeve, by the amount of the developer between development sleeve 27 and the cylindrical body 34, depend on by magnetic roller 28 and magnetic pole and form the magnetic force distribution that portion 35 forms.The magnetic pole of left magnetic roller 28 is N utmost points, and the magnetic pole that is positioned at the magnetic production part 22 of magnetic roller 28 closest-approach distances also is under the situation of the N utmost point, owing to repel mutually, the magnetic flux density between magnetic production part 22 and the magnetic roller 28 diminishes.And in this case, along with magnetic production part 22B is moved in the horizontal direction, distance between magnetic production part 22 and the magnetic roller 28 is diminished, magnetic flux density further diminishes, so, the carrying capacity of developer diminishes, and is little by the quantitative change of the developer between development sleeve 27 and the magnetic production part 22.

In addition, make magnetic pole formation portion 35 carry out angular displacement around axis, the magnetic pole of left magnetic roller 28 is N utmost points, and the magnetic pole that is positioned at the magnetic pole formation portion 35 of magnetic roller 28 closest-approach distances is under the situation of the S utmost point, owing to attract each other, it is big that the magnetic flux density between magnetic pole formation portion 35 and the magnetic roller 28 becomes.In addition, in this case, along with the distance between magnetic production part 22 and the magnetic roller 28 diminishes, it is big that magnetic flux density further becomes, so the change of the carrying capacity of developer is big, many by the quantitative change of the developer between development sleeve 27 and the cylindrical body 34.Thereby the angular displacement by control magnetic pole formation portion 35 and at the displacement of horizontal direction can critically be controlled the carrying capacity based on the developer of developer roll.

To set at the toner that the resupplies in the developer container 16 is used, the whereabouts, top from mixing component in the present embodiment, falls near the almost centre of paddle 18 and agitating roller 19.The toner that utilizes the supply of developer that development sleeve 27 moves and whereabouts to use meets in above-mentioned place roughly, utilizes 19 liang of mixing components of paddle 18 and agitating roller, and above-mentioned supply is mixed, stirs with developer with toner.

According to the direction that makes 22 displacements of magnetic production part, the control performance of magnetic force changes, but, x goes up mobile while rotating in the horizontal direction by making magnetic production part 22 especially, can be according to the characteristic and the environment for use of developer, amount to the developer that moves by development sleeve 27, carry out careful adjustment, control with the position of meeting with the supply toner, so corresponding accurate stirring control such as the amount of the toner that can realize and be supplied with, flowability is so can obtain the whipping performance of optimum developer.

Below, the developing apparatus 1 of the 5th embodiment of the present invention is described.Figure 15 A～Figure 15 D is the front view that amplifies the surface of the surface of cylindrical body 34 of expression present embodiment and development sleeve 27.In the present embodiment, it is characterized in that the surfaceness of magnetic production part 22 is different with the surfaceness of development sleeve 27.

Figure 15 A is the figure on the surface of expression cylindrical body 34, shown in Figure 15 A, for example, on the surface of cylindrical body 34, forms a plurality of rectangular-shaped grooves 48 that extend along axis direction.The degree of depth of the groove 48 of cylindrical body 34 for example is 1mm, and the interval of groove 48 for example is 1mm.Figure 15 B is the figure on the surface of expression development sleeve 27, shown in Figure 15 B, for example on the surface of development sleeve 27, forms a plurality of rectangular-shaped grooves 49 that extend along axis direction.The degree of depth of the groove 49 of development sleeve 27 for example is 3mm, and the interval of groove 49 for example is 3mm.Like this, the surfaceness of cylindrical body 34 is different with the surfaceness of development sleeve 27.In addition, be not limited to shown in Figure 15 A and Figure 15 B, the formation that the surfaceness of cylindrical body 34 is littler than the surfaceness of development sleeve 27 also can be that the surfaceness of cylindrical body 34 is bigger.

In addition, shown in Figure 15 C, the shape of groove 48,49 be not limited to Figure 15 A and the such rectangular-shaped shape of Figure 15 B, also can be the groove 50 of V word shape.In addition, also can as Figure 15 D, implement side sandblast (side blast) and handle, form surfaceness Rz and be the following groove 51 of the following hundreds of μ m of number μ mm on the surface.The groove 48,49,50 of rectangular-shaped groove and V word shape, mould that can be by to the moulding of stripping pattern (drawing) method the time preestablishes its model and waits and form.So-called side blasting treatment is a method of making groove by the abrasive substance that sprays attached beaded glass etc. on the surface.

Interval according to the shape of above such groove and size, groove can at random change the carrying capacity based on the developer of development sleeve 27 and cylindrical body 34.As the determination methods of the operational throughput of such developer, for example can use outside idle running machine, make developer roll 17 with the condition that is predetermined, for example 400rpm rotation after 3 minutes, the weight of the developer of per unit area is measured, judge.

Like this, in the present embodiment, the surfaceness of magnetic production part 22 is different with the surfaceness of development sleeve 27.For surfaceness, make the different of magnetic production part 22 and development sleeve 27 by like this, can make the amount difference of the developer that is moved by surperficial carrying of two parts.Thereby thick than magnetic production part 22 of the surfaceness by making development sleeve 27 for example can make the operational throughput of the developer that development sleeve 27 carried increase, so, the transport capacity of developer can be set for bigger than magnetic production part 22.Thus, the amount of the developer carried by developer roll 17 can be set in institute's required amount.

The present invention can not exceed its spirit or principal character and implement with other various ways.Therefore, above-mentioned embodiment, it is in office that where face is nothing but illustration, and scope of the present invention is the scope shown in claims, and not restrained by any of instructions this paper.And then the distortion, the change that belong to claims scope all belong to scope of the present invention.

Claims (11)

1. a developing apparatus uses two-component developing agent to develop the electrostatic latent image that is formed at as supporting body, it is characterized in that having:

Developer carrier, it has: development sleeve, rotatably be provided with around the first axle that is predetermined, and the carrying two-component developing agent is carried to the picture supporting body; And the magnetic roller, be arranged in the development sleeve, produce magnetic;

Layer-thickness restriction member is provided with opposed to each other with development sleeve, is used to limit the bed thickness of the two-component developing agent that development sleeve carries;

The magnetic production part at the upstream side that also is in the sense of rotation of above-mentioned development sleeve than above-mentioned layer-thickness restriction member, can be provided with displacement with development sleeve is opposed, produces magnetic; And

Control part is controlled the displacement of the above-mentioned relatively development sleeve of above-mentioned magnetic production part.

2. developing apparatus as claimed in claim 1 is characterized in that,

Above-mentioned magnetic production part constitutes at least in the horizontal direction can carry out displacement,

Above-mentioned control part is controlled above-mentioned magnetic production part displacement in the horizontal direction.

3. developing apparatus as claimed in claim 1 is characterized in that,

Above-mentioned magnetic production part has:

Form the cylindrical body of tubular, can carry out angular displacement ground around second axis that is predetermined and be provided with; And

Magnetic pole formation portion is in the inboard of above-mentioned cylindrical body, forms magnetic poles in a plurality of positions of cylindrical body circumferencial direction,

Above-mentioned control part is controlled around the angular displacement of second axis above-mentioned cylindrical body.

4. developing apparatus as claimed in claim 1 is characterized in that,

The magnetic production part is in the length of first axle bearing of trend, with the equal in length of developer carrier at the first axle bearing of trend.

5. developing apparatus as claimed in claim 1 is characterized in that,

The magnetic production part is in the length of first axle bearing of trend, and is longer in the length of first axle bearing of trend than developer carrier.

6. developing apparatus as claimed in claim 1 is characterized in that,

Above-mentioned control part based on the toner concentration that concentration detects, is controlled the displacement of above-mentioned magnetic production part, and this concentration is used to detect the toner concentration that is developed by the picture supporting body.

7. developing apparatus as claimed in claim 1 is characterized in that,

The surfaceness of above-mentioned magnetic production part is different with the surfaceness of above-mentioned development sleeve.

8. developing apparatus as claimed in claim 3 is characterized in that,

The diameter of above-mentioned cylindrical body is littler than the diameter of above-mentioned development sleeve.

9. developing apparatus as claimed in claim 3 is characterized in that,

The diameter of above-mentioned cylindrical body and the equal diameters of above-mentioned development sleeve.

10. developing apparatus as claimed in claim 1 is characterized in that,

At the magnetic force that is had with the magnetic roller opposed position of above-mentioned magnetic production part, in the above-mentioned development sleeve, it is big to be set at the magnetic force that is had than the magnetic production part with the opposed position of development sleeve.

11. an image processing system is characterized in that, possesses developing apparatus as claimed in claim 1.

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