CN100517111C - Toner-particle bearing roller, developing device, and image forming apparatus - Google Patents

Toner-particle bearing roller, developing device, and image forming apparatus Download PDF

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Publication number
CN100517111C
CN100517111C CNB2006101379701A CN200610137970A CN100517111C CN 100517111 C CN100517111 C CN 100517111C CN B2006101379701 A CNB2006101379701 A CN B2006101379701A CN 200610137970 A CN200610137970 A CN 200610137970A CN 100517111 C CN100517111 C CN 100517111C
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China
Prior art keywords
toner
particle
protuberance
developer roll
recess
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CN1959553A (en
Inventor
山田阳一
有贺友洋
樱井升
冈本克巳
加藤洋
功刀正尚
福元贵智
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Seiko Epson Corp
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Seiko Epson Corp
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Abstract

A developing device includes a toner particle-bearing roller that bears toner particles on its surface and develops a latent image borne by an image-bearing member with those toner particles, the toner particle-bearing roller has a projection portion disposed on its surface, the projection portion having a top surface having a flat portion, and a width of the top surface being equal to or more than a volume average particle diameter of the toner particles.

Description

Toner-particle bearing roller, developing apparatus and image processing system
Technical field
The present invention relates to toner-particle bearing roller, developing apparatus and image processing system.
Background technology
Image processing systems such as laser beam printer have been known.This image processing system for example have be used to carry sub-image make the developing apparatus that is carried on image development on the described picture supporting body as supporting body with by toner-particle.In image processing system, when sending picture signal etc. from external device (ED)s such as main frames, developing apparatus is positioned on the developing location relative with the picture supporting body, form the toner picture by the toner-particle in the developing apparatus to being carried on to develop as the sub-image on the supporting body, then this toner is looked like to be transferred on the medium, thereby on medium, finally form image.
In order to realize to being carried on as this described function of developing of the sub-image on the supporting body, above-mentioned developing apparatus has toner-particle bearing roller, this toner-particle bearing roller carries toner-particle in its surface, comes to develop to being carried on as the sub-image on the supporting body by this toner-particle.
In addition, in developing apparatus, on the surface of the toner-particle bearing roller that should suitably carry toner-particle, be formed with protuberance.But, be formed with when surface under the situation of protuberance, sometimes because the shape of this protuberance and by the by-local forces what of protuberance to toner-particle at toner-particle bearing roller.For example, relatively under the situation of point, when this protuberance touches toner-particle, can effectively concentrate the part that affacts toner-particle at described protuberance from protuberance.Like this, when during to the concentration of local acting force of toner-particle, the danger that causes toner distortion or toner-particle to break because of this acting force being arranged by protuberance.
In addition, for suitable carrying toner-particle, on the surface of toner-particle bearing roller, be provided with sometimes have planar bottom surface and with the recess of the side of this bottom surface adjacency.So may be detained in some cases, the toner-particle of toner-particle, particularly small powdery in the boundary portion of described bottom surface and described side.
In addition, the recess and the protuberance that on the surface of some toner-particle bearing roller, have the rule configuration.What undertaken by the lip-deep toner-particle that is carried on toner-particle bearing roller is to carry out under toner-particle bearing roller and the state relative as supporting body to being carried on the development of carrying out as the sub-image on the supporting body, but sometimes following situation can take place, that is: be carried on the toner-particle in the described recess of toner-particle bearing roller and be carried on as the distance between the sub-image on the supporting body bigger than the toner-particle and the distance between the described sub-image that are carried on the described protuberance.So under conditions associated, be formed on as the density of the toner picture on the supporting body than to be formed on the density of the toner picture on the picture supporting body light by being carried on toner-particle on the described protuberance by being carried on toner-particle in the described recess, thereby may in the toner picture, produce gradation unequal.
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Summary of the invention
The present invention makes in view of above-mentioned problem, and its purpose is to realize the developing apparatus of a kind of distortion that can suppress toner-particle etc.
Main aspect of the present invention is following developing apparatus.
A kind of developing apparatus, has toner-particle bearing roller, this toner-particle bearing roller carries toner-particle in its surface, and develop to being carried on as the sub-image on the supporting body by this toner-particle, wherein, described toner-particle bearing roller has and is arranged on described lip-deep protuberance, and this protuberance possesses the end face with flat, and the width of this end face is more than the volume average particle size of described toner-particle.
In addition, the present invention makes in view of above-mentioned problem, and its purpose is to realize a kind of toner-particle bearing roller that can suitably suppress the delay of toner-particle.
Major part of the present invention is following toner-particle bearing roller.
A kind of toner-particle bearing roller, have and be located at lip-deep recess, this recess have flat bottom surface and with the side of this bottom surface adjacency, the boundary portion in this bottom surface and this side is provided with fillet, the radius-of-curvature of this fillet is over half the volume average particle size of toner-particle.
In addition, the present invention makes in view of above-mentioned problem, and its purpose is to be suppressed in the toner picture and produces density unevenness.
Major part of the present invention is following toner-particle bearing roller.
A kind of toner-particle bearing roller has the recess and the protuberance that are located at upward surperficial and configuration rule, and here, the maximal value of 10 mean roughness of described recess is littler than the maximal value of 10 mean roughness of described protuberance.
For further feature of the present invention, undertaken clearly by accompanying drawing and following record.
In order more intactly to understand the present invention and advantage thereof, with reference to the following description and accompanying drawing.
Description of drawings
Fig. 1 is the synoptic diagram that constitutes the main composition part of printer 10;
Fig. 2 is the block diagram of control module that the printer 10 of Fig. 1 is shown;
Fig. 3 is the concept map of developing apparatus;
Fig. 4 is the sectional view that the main composition part of developing apparatus is shown;
Fig. 5 is the schematic perspective view of developer roll 510, and it shows the mutually different spiral helicine first slot part 518a of winding direction and the second slot part 518b;
Fig. 6 is the front schematic view of developer roll 510;
Fig. 7 is the synoptic diagram that the surface of developer roll 510 is shown, and it amplifies part A shown in Figure 6;
Fig. 8 is the synoptic diagram that the cross sectional shape of protuberance 519 and recess 518 is shown;
Fig. 9 is the process flow diagram that the manufacture method of developer roll 510 is shown;
Figure 10 A～Figure 10 E is the transformation synoptic diagram of the developer roll 510 in the manufacturing process of developer roll 510;
Figure 11 is the key diagram that is used to illustrate the rolling forming processing of developer roll 510;
Figure 12 is the figure that is used for illustrating the spacing of screen and sub-image;
Figure 13 is the figure that the variation of developer roll 510 is shown, and is the synoptic diagram that the cross sectional shape of protuberance 519 is shown;
Figure 14 is the synoptic diagram that the cross sectional shape of the protuberance 1519 of second embodiment and recess 1518 is shown;
Figure 15 is the schematic perspective view of the developer roll 510 of the 3rd embodiment;
Figure 16 is the front schematic view of the developer roll 510 of the 3rd embodiment;
Figure 17 is the synoptic diagram of cross sectional shape that the lip-deep recess 2516 of the developer roll 510 that is located at the 3rd embodiment is shown;
Figure 18 is the key diagram that is used for illustrating the problem that the recess 2516 that had at the developer roll 510 of example is in the past produced;
Figure 19 is the key diagram that is used to illustrate the validity of the recess 2516 that the developer roll 510 of the 3rd embodiment is had;
Figure 20 is the front schematic view of developer roll 510 of the variation of the 3rd embodiment;
Figure 21 is the synoptic diagram of cross sectional shape of recess 2580 that the variation of the 3rd embodiment is shown;
Figure 22 is the schematic perspective view of the developer roll 510 of the 4th embodiment;
Figure 23 is the front schematic view of the developer roll 510 of the 4th embodiment;
Figure 24 is the enlarged drawing that the central portion 510a of the developer roll 510 of the 4th embodiment has been carried out amplification;
Figure 25 is the synoptic diagram of the shape of protuberance 3512 that the 4th embodiment is shown, recess 3515 etc.;
Figure 26 is the synoptic diagram (one) of validity that is used to illustrate the developing apparatus of the 5th embodiment;
Figure 27 is the synoptic diagram (its two) of validity that is used to illustrate the developing apparatus of the 5th embodiment;
Figure 28 is the synoptic diagram (its three) of validity that is used to illustrate the developing apparatus of the 5th embodiment;
Figure 29 is the key diagram that the surface structure of image formation system is shown;
Figure 30 is the block diagram that image formation system structure shown in Figure 29 is shown.
Embodiment
By the record of this instructions and accompanying drawing, clear and definite at least following item.
The invention provides a kind of developing apparatus, this developing apparatus has toner-particle bearing roller, this toner-particle bearing roller carries toner-particle in its surface, and develop to being carried on as the sub-image on the supporting body by this toner-particle, wherein, described toner-particle bearing roller has and is arranged on described lip-deep protuberance, and this protuberance possesses the end face with flat, and the width of this end face is more than the volume average particle size of described toner-particle.
According to this developing apparatus, when the end face more than the volume average particle size of the width with flat and this flat at toner-particle touches toner-particle, power from protuberance (end face) peptizaiton on toner-particle.Therefore,, can restraint affact the part of toner-particle from the protuberance concentrated area, thereby can suppress distortion that causes by this power toner-particle etc. according to above-mentioned developing apparatus.
Also has layer-thickness restriction member in addition, this layer-thickness restriction member contacts with this toner-particle bearing roller in the gamut of the other end from an axial end of described toner-particle bearing roller, be used to limit the bed thickness that is carried on the toner-particle on this toner-particle bearing roller, described layer-thickness restriction member also can contact with described toner-particle bearing roller by plane that this layer-thickness restriction member has and limit described bed thickness.
When limiting described bed thickness when contacting with toner-particle bearing roller by the plane that layer-thickness restriction member had because layer-thickness restriction member presses to protuberance (end face) with toner-particle, therefore easily from protuberance to the toner-particle acting force.Therefore, in these cases, the effect that the protuberance with described end face is set on the surface of toner-particle bearing roller can be played effectively, that is, the effect of toner-particle distortion can be suppressed.
In addition, described protuberance can have the side that links to each other with described end face, and is formed with fillet at the connecting portion of described end face and set side.
When the connecting portion in end face and side is formed with fillet,, therefore, can reduce by the power of connecting portion to the toner-particle effect owing to do not form the edge at this connecting portion.Thereby can suppress in these cases, the distortion of toner-particle.
What in addition, the radius-of-curvature of described fillet can be for the volume average particle size of described toner-particle is over half.
The radius-of-curvature of fillet than half (being the mean radius of toner-particle) of the volume average particle size of toner-particle little situation under, when toner-particle contact fillet because this fillet is invaded in toner-particle by the concentration of local acting force of fillet to toner-particle.And be under the situation over half of volume average particle size of toner-particle in the radius-of-curvature of fillet because fillet can not invade in the toner-particle, therefore, by fillet to the toner-particle dissipation of ferees.Thereby can suppress in these cases, the distortion of toner-particle etc.
In addition, be provided with spiral helicine slot part on described surface, this slot part tilts with respect to the axial and circumferencial direction of described toner-particle bearing roller, and in described axial equal intervals.Make the described angle of inclination of described slot part different and form two types slot part, described protuberance is surrounded by described two types described slot part, and the degree of depth of described slot part can be below the twice for the volume average particle size of described toner-particle.
Under described situation, because the toner-particle between toner-particle bearing roller and layer-thickness restriction member is many in slot part, can touch some at least in toner-particle bearing roller and the layer-thickness restriction member, therefore make the charging property of toner-particle suitable.
In addition, be provided with spiral helicine slot part on described surface, this slot part tilts with respect to the axial and circumferencial direction of described toner-particle bearing roller, and in described axial equal intervals.Make the described angle of inclination difference of described slot part and form two types slot part, described protuberance is surrounded by described two types described slot part, described sub-image has at the point-like sub-image that is being divided into the formation of cancellate zone, described axially on, grid can be formed by polytype interval, and the described interval on axially of described slot part can be littler than interval the longest in polytype interval in the described grid.
On the surface of toner-particle bearing roller, the bearing capacity of the toner-particle of slot part is more than the bearing capacity in the place outside the slot part.Therefore, when the development sub-image, may only there be the density at the position relative to raise with slot part.At the axially spaced-apart of slot part in than the polytype interval in the grid under the big situation in the longest interval, when when being formed on the point-like sub-image that is divided in the cancellate zone and developing, can be created in point that the part of the slot part that comprises toner-particle bearing roller forms and the point that forms in the part that does not comprise slot part.At this moment, can in the toner picture of sub-image that developed, produce periodically density unevenness.According to above-mentioned developing apparatus, the point that each point-like sub-image is developed all is formed on the part of the slot part that comprises toner-particle bearing roller.Therefore, can be suppressed at the density unevenness that generation causes because of slot part in the toner picture that is developed.
The invention provides a kind of image processing system, this image processing system has developing apparatus, and this developing apparatus possesses: the picture supporting body that is used to carry sub-image; And toner-particle bearing roller, this toner-particle bearing roller carries toner-particle in its surface, and describedly develops as the sub-image on the supporting body to being carried on by this toner-particle; Wherein, described toner-particle bearing roller has and is arranged on described lip-deep protuberance, and this protuberance possesses the end face with flat, and the width of this end face is more than the volume average particle size of described toner-particle.
According to this image processing system, when having flat and the end face more than the volume average particle size of its width at toner-particle when contacting with toner-particle, by protuberance (end face) to the toner-particle dissipation of ferees.Therefore, according to above-mentioned image processing system, owing to can suppress, therefore can suppress the distortion of the toner-particle that causes because of this power etc. by the concentration of local acting force of protuberance to toner-particle.
The present invention also provides a kind of developing apparatus, this developing apparatus has toner-particle bearing roller, this toner-particle bearing roller carries described toner-particle in its surface, and develop to being carried on as the sub-image on the supporting body by this toner-particle, described toner-particle bearing roller has and is arranged on described lip-deep protuberance, top ends at least at this protuberance possesses fillet, and the radius-of-curvature of this fillet is volume average particle size over half of described toner-particle.
According to this developing apparatus, when fillet contact toner-particle, by protuberance (fillet) to the toner-particle dissipation of ferees.Therefore, under the situation of above-mentioned developing apparatus, owing to can suppress, therefore can suppress the distortion of the toner-particle that causes because of this power etc. by the concentration of local acting force of protuberance to toner-particle.
Toner-particle bearing roller of the present invention has and is located at lip-deep recess, this recess have flat bottom surface and with the side of this bottom surface adjacency, boundary portion in this bottom surface and this side is provided with fillet, and the radius-of-curvature of this fillet is volume average particle size over half of toner-particle.
Under described situation, can realize suitably suppressing the toner-particle bearing roller of the delay of toner-particle.
In addition, also have described bottom surface and at the non-recess of opposition side and described side adjacency, the boundary portion in this non-recess and described side is provided with fillet, the radius-of-curvature of this fillet is volume average particle size over half of toner-particle.
Under described situation, with the boundary portion of the side of described planar bottom surface adjacency and described non-recess in owing to can suppress the distortion of toner-particle to the toner-particle dissipation of ferees.
The present invention also provides a kind of developing apparatus, this developing apparatus has toner-particle bearing roller, this toner-particle bearing roller has and is located at lip-deep recess, this recess have flat bottom surface and with the side of this bottom surface adjacency, boundary portion in this bottom surface and this side is provided with fillet, and the radius-of-curvature of this fillet is volume average particle size over half of toner-particle.
Under described situation, can realize suitably suppressing the developing apparatus of the delay of toner-particle.
The invention provides a kind of toner-particle bearing roller, it has and is located at lip-deep recess, this recess possesses first side and second side, this first side and this second side have and are inclined to plane part and toward each other, this first side and this second side are adjacent by the bottom of this recess, this first side on described bottom and the boundary portion of this second side are provided with fillet, and the radius-of-curvature of this fillet is volume average particle size over half of toner-particle.
Under described situation, can realize suitably suppressing the toner-particle bearing roller of the delay of toner-particle.
In addition, the 3rd side that another recess on described first side that described recess has and described recess next door has is adjacent on the top of described recess and this another recess, boundary portion in this first side and the 3rd side is provided with fillet, and the radius-of-curvature of this fillet is volume average particle size over half of toner-particle.
Under described situation, in the boundary portion of described first side and described the 3rd side, owing to can suppress the distortion of toner-particle to the toner-particle dissipation of ferees.
The invention provides a kind of developing apparatus, it has toner-particle bearing roller, this toner-particle bearing roller has and is located at lip-deep recess, this recess possesses first side and second side, this first side and this second side have and are inclined to plane part and toward each other, this first side and this second side are adjacent by the bottom of this recess, this first side on described bottom and the boundary portion of this second side are provided with fillet, and the radius-of-curvature of this fillet is over half the volume average particle size of toner-particle.
Under described situation, can realize suitably suppressing the developing apparatus of the delay of toner-particle.
The invention provides a kind of toner-particle bearing roller, it has recess and the protuberance that is located at upward surperficial and configuration rule, and here, the maximal value of 10 mean roughness of described recess is littler than the maximal value of 10 mean roughness of described protuberance.
According to described toner-particle bearing roller, can be suppressed in the toner picture and produce density unevenness.
When in addition, the direction of the average line of the roughness curve of ten of described protuberance mean roughness in the time will asking these 10 mean roughness is made as axial direction along toner-particle bearing roller for maximum.
When in addition, the direction of the average line of the roughness curve of ten of described protuberance mean roughness in the time will asking these 10 mean roughness is made as direction along the circumferencial direction of toner-particle bearing roller for minimum.
Under described situation, can improve the rotation of toner-particle.
In addition, the maximal value of ten of described protuberance mean roughness is below the volume average particle size of toner-particle.
Under described situation, can further improve the rotation of toner-particle.
The invention provides a kind of developing apparatus, it has toner-particle bearing roller, this toner-particle bearing roller has recess and the protuberance that is located at upward surperficial and configuration rule, here, the maximal value of ten of described recess mean roughness is littler than the maximal value of 10 mean roughness of described protuberance.
Under described situation, can be suppressed in the toner picture and produce gradation unequal.
The invention provides a kind of developing apparatus, it has toner-particle bearing roller, this toner-particle bearing roller has a plurality of protuberances from the teeth outwards, this surface is used to carry and is used for toner-particle that sub-image is developed, by perforated foams described toner-particle is supplied with described toner-particle bearing roller, the described toner-particle bearing roller between the opening in hole axially on mean distance than the end face of described protuberance axially on breadth extreme little.
According to described developing apparatus, can prevent from the toner picture that is developed, to produce the damaged or lower position of generation density.
(the one-piece construction example of image processing system)
Use Fig. 1 below,, its general structure is described with the example of laser beam printer (hereinafter referred to as printer) 10 as image processing system.Fig. 1 is the synoptic diagram that constitutes the main composition part of printer 10.Among Fig. 1, represent above-below direction with arrow, for example, paper feed tray 92 is configured in the bottom of printer 10, and fixation unit 90 is configured in the top of printer 10.
(topology example of printer 10)
Printer 10 for present embodiment, as shown in Figure 1, along having as the sense of rotation as the photoreceptor 20 of an example of supporting body: charhing unit 30, exposing unit 40, YMCK developing cell 50, transfer printing unit 60, intermediate transfer body 70, cleaning unit 75 first also have in addition: secondary transfer printing unit 80, fixation unit 90, the display unit 95 that forms as the notification means of notifying the user and by liquid crystal panel and control the control module 100 that these unit wait servo printing.
The photographic layer that photoreceptor 20 has conductive substrate cylindraceous and is formed on its outer peripheral face, and can central shaft be that the center is rotated, in the present embodiment, shown in the arrow among Fig. 1, turn clockwise.
Charhing unit 30 is to be used for device that photoreceptor 20 is charged, and exposure device 40 is the devices that form sub-image on the photoreceptor 20 that charges by irradiating laser.This exposure device 40 has: be used to penetrate the semiconductor laser as the laser beam of light; Make the polygon mirror unit of polygonal polygon mirror rotation; Polytype lens such as f-θ lens.This exposure device 40 shines modulated laser beam according to the picture signal from not shown main frame input such as personal computer, word processor on the photoreceptor 20 that is recharged.At this moment, the laser beam irradiation that penetrates from semiconductor laser is on polygon mirror.The rotation of laser beam by polygon mirror that is radiated on the polygon mirror changes reflection angle, and scioptics and scanning on photoreceptor 20.At predetermined regularly open (on)/close (off) laser beam, thereby being divided on the photoreceptor 20 of rotation at a predetermined velocity forms the point-like sub-image on the cancellate zone.These point-like sub-images constitute sub-image.Here, because formation is sub-image, therefore can't with the naked eye see.
YMCK developing cell 50 uses the toner-particle (being designated hereinafter simply as toner T) that is contained in the developing apparatus, promptly is contained in black (K) toner in the black developing device 51, is contained in magenta (M) toner in the magenta developing apparatus 52, is contained in cyan (C) toner in the cyan developing apparatus 53 and is contained in yellow (Y) toner in the yellow developing apparatus 54 and the sub-image that is formed on the photoreceptor 20 is developed.
This YMCK developing cell 50 can be by being rotated the position that changes described four developing apparatuss 51,52,53,54 under the state that described four developing apparatuss 51,52,53,54 are installed.Promptly.This YMCK developing cell 50 supports described four developing apparatuss 51,52,53,54 by four support 55a, 55b, 55c, 55d, described four developing apparatuss 51,52,53,54 can be the center with central shaft 50a, are rotated keeping under the situation of its relative position.Whenever after finishing the formation of one page image, optionally relative with photoreceptor 20, utilize the toner T that is contained in each developing apparatus 51,52,53,54 that the sub-image that is formed on the photoreceptor 20 is developed in turn.In addition, each in described four developing apparatuss 51,52,53,54 all can freely be loaded and unloaded with respect to the described support of YMCK developing cell 50.In addition, will be described in detail each developing apparatus in the back.
The transfer printing unit 60 monotone toner that is used for being formed on the photoreceptor 20 looks like to be transferred to intermediate transfer body 70 first, behind the toner of four kinds of colors that superposeed transfer printing in turn, has just formed full-color toner picture on intermediate transfer body 70.
This intermediate transfer body 70 is to be provided with tin evaporation layer on the surface of PET film, and is formed with the laminated type endless band of semi-conductive paint on this top layer, and this intermediate transfer body 70 is to be driven in rotation with the roughly the same peripheral speed of photoreceptor 20.
Monotone toner picture or full-color toner that secondary transfer printing unit 80 is used for being formed on the intermediate transfer body 70 look like to be transferred to media such as paper, film, cloth.
Fixation unit 90 be used to make the monotone toner picture that is transferred on the medium or full-color toner as heat bonding on medium to form permanent image.
Cleaning unit 75 is located at first between the transfer printing unit 60 and charhing unit 30, and cleaning balde 76 with the rubber system that contacts with the surface of photoreceptor 20, on intermediate transfer body 70, after the transfer printing toner picture, sweeping and removing the toner T that remains on the photoreceptor 20 by transfer printing unit 60 first by cleaning balde 76.
As shown in Figure 2, control module 100 is made of master controller 101 and cell controller 102, to master controller 101 received image signals and control signal, according to the instruction based on this picture signal and control signal, described each unit of cell controller 102 controls waits and forms image.
(the action example of printer 10)
The following describes the action of the printer 10 that constitutes as described above.
At first, when in picture signal and control signal from not shown main frame are input to printer 10 via interface (I/F) 112 the master controller 101, under based on control from the cell controller 102 of the instruction of this master controller 101, photoreceptor 20 and 70 rotations of intermediate transfer body.Photoreceptor 20 is recharged unit 30 at charge position and charges successively in rotation simultaneously.
Photoreceptor 20 is recharged the zone and arrives exposure position along with the rotation of photoreceptor 20, and forms by exposing unit 40 and in this zone corresponding to first color, the sub-image of the image information of yellow Y for example.In addition, the YMCK developing cell 50 yellow developing apparatus 54 that will hold yellow (Y) toner places the developing position relative with photoreceptor 20.
The sub-image that is formed on the photoreceptor 20 arrives developing location along with the rotation of photoreceptor 20, and is developed by yellow developing apparatus 54 usefulness yellow developer.Thus, on photoreceptor 20, form the Yellow toner picture.
The Yellow toner picture that is formed on the photoreceptor 20 arrives transfer position first along with the rotation of photoreceptor 20, and is transferred on the intermediate transfer body 70 by transfer printing unit 60 first.At this moment, apply the polarity first transfer voltage opposite to transfer printing unit 60 first with the charging polarity of toner.And during this period, photoreceptor 20 and intermediate transfer body 70 contact, and secondary transfer printing unit 80 leaves intermediate transfer body 70.
For second color, the 3rd color and the 4th color, every kind of developing apparatus is carried out above-mentioned processing successively, and thus, four colour toners pictures of corresponding each picture signal overlap and are transferred on the intermediate transfer body 70.On intermediate transfer body 70, form full-color toner picture thus.
The full-color toner picture that is formed on the intermediate transfer body 70 arrives the secondary transfer printing position along with the rotation of intermediate transfer body 70, and is transferred on the medium by secondary transfer printing unit 80.Medium is sent to secondary transfer printing unit 80 from paper feed tray 92 via paper-feed roll 94, register roller (register roller) 96.In addition, when carrying out the transfer printing action, secondary transfer printing unit 80 is pressed against on the intermediate transfer body 70, and is applied in secondary transfer printing voltage.
Be transferred to full-color toner picture on the medium by fixation unit 90 heating and pressurizing and heat bonding on medium.
On the other hand, photoreceptor 20 is swept attached to its lip-deep toner T by the cleaning balde 76 that is bearing on the cleaning unit 75 through after the transfer position first, and prepares to be used to form the charging of next sub-image.Sweeping the toner T that falls is recycled in the residual toner recoverer that cleaning unit 75 had.
(summary of control module)
The structure of control module 100 is described below with reference to Fig. 2.The master controller 101 of control module 100 is electrically connected with main frame via interface 112, and possesses the video memory 113 that is used to store from the picture signal of this main frame input.Each unit of cell controller 102 and device body (charhing unit 30, exposing unit 40, YMCK developing cell 50, transfer printing unit 60, cleaning unit 75, secondary transfer printing unit 80, fixation unit 90, display unit 95) first is electrically connected, by receiving the state that detects each unit from the signal of the sensor that these unit possessed, and according to each unit of signal controlling from master controller 101 inputs.
(summary of developing apparatus)
The structure example of obvious image device and action example below with reference to Fig. 3 and Fig. 4.Fig. 3 is the concept map of developing apparatus.Fig. 4 is the sectional view that the main composition part of developing apparatus is shown.What sectional view shown in Figure 4 was represented is the cross section that intercepts developing apparatus with the face perpendicular to length direction shown in Figure 3.In Fig. 4, identical in addition with Fig. 1, represent above-below direction with arrow, for example, the central shaft of developer roll 510 is below the central shaft of photoreceptor 20.In addition, figure 4 illustrates the state that yellow developing apparatus 54 is positioned at the developing position relative with photoreceptor 20.
Though in YMCK developing cell 50, be provided with the black developing device 51, the magenta developing apparatus 52 that holds magenta (M) toner that hold black (K) toner, hold the cyan developing apparatus 53 of cyan (C) toner and the yellow developing apparatus 54 that holds yellow (Y) toner, but because the structure of each developing apparatus is identical, therefore, below yellow developing apparatus 54 is described.
(structure example of developing apparatus)
Yellow developing apparatus 54 has: as the developer roll 510 of an example of toner-particle bearing roller, on seal 520, toner accommodating body 530, housing 540, toner supplying roller 550, as the limiting scraper 560 of an example of layer-thickness restriction member etc.
Carry toner-particle (toner T) on the surface of developer roll 510, this developer roll 510 develops to the sub-image that is carried on the photoreceptor 20 by this toner-particle.This developer roll 510 is the parts that are made of aluminium alloy, ferroalloy etc.On the surface of developer roll 510, be provided with recess 518 and protuberance 519 (with reference to Fig. 6) as an example of slot part.The back will be described in detail the surface configuration of developer roll 510.
In addition as shown in Figure 3, developer roll 510 is supported on two ends of length direction (developer roll 510 axially) of developing apparatus, and can central shaft be that the center is rotated.As shown in Figure 4, developer roll 510 is gone up rotation in the direction opposite with the sense of rotation (being clockwise direction) of photoreceptor 20 (being counter clockwise direction in Fig. 4) in Fig. 4.Its central shaft is positioned at the below of the central shaft of photoreceptor 20.
In addition, under the relative state of yellow developing apparatus 54 and photoreceptor 20, there is the space between developer roll 510 and the photoreceptor 20.That is, yellow developing apparatus 54 develops to the sub-image that is formed on the photoreceptor 20 under contactless state.In addition, when when being formed on sub-image on the photoreceptor 20 and developing, between developer roll 510 and photoreceptor 20, form alternating electric field.
With a plurality of resinous housing section of integrally formed formation, be that upper casing body 542 and lower casing body 544 weld and produce housing 540, be formed with the toner accommodating body 530 that is used to hold toner T in the inside of this housing 540.Toner accommodating body 530 by from inwall to the inside (above-below direction of Fig. 4) dividing wall 545 outstanding, that be used to isolate toner T be divided into two toner accommodating portions, i.e. first 530a of toner accommodating portion and second 530b of toner accommodating portion.
The top of first 530a of toner accommodating portion and second 530b of toner accommodating portion is communicated with, and under state shown in Figure 4, limits moving of toner T by dividing wall 545.But when 50 rotations of YMCK developing cell, be contained in toner among first 530a of toner accommodating portion and second 530b of toner accommodating portion and in a single day concentrate on connection position one side of the upper side of developing location, then when returning state shown in Figure 4, these toners can return first 530a of toner accommodating portion and second 530b of toner accommodating portion with mixing mutually.That is, the toner T in the developing apparatus can obtain agitation as appropriate by the rotation of YMCK developing cell 50.
Therefore, in the present embodiment,, also can be provided for stirring the mixing component of the toner T that is contained in the toner accommodating body 530 in toner accommodating body 530 though mixing component is not set.In addition as shown in Figure 4, housing 540 (i.e. first 530a of toner accommodating portion) has opening 572 in the bottom, and developer roll 510 is oppositely arranged with this opening 572.
Toner supplying roller 550 constitutes by roller portion with as the axis body of roller portion rotation center, and described roller portion is formed by rubber-like perforated foams, for example isocyanurate foam.The axis body both end sides of toner supplying roller 550 is supported on the housing 540, can rotate freely around axis body thus.Described roller portion is accommodated among described first 530a of toner accommodating portion (in the housing 540) of housing 540, and the toner T that is contained among first 530a of toner accommodating portion is received in the hole, and the toner that is contained in the described hole mainly is supplied to developer roll 510.Toner supplying roller 550 be set at first 530a of toner accommodating portion under.The toner T that is contained among first 530a of toner accommodating portion is supplied to developer roll 510 in the bottom of the 530a of this toner accommodating portion by toner supplying roller 550.In addition, the residue toner T that will remain in after toner supplying roller 550 will develop on the developer roll 510 peels off from developer roll 510.At this moment, the wall that is surrounded by a plurality of holes zone that is formed on the toner supplying roller 550 contacts with developer roll 510, and the toner that will remain on the developer roll 510 peels off thus.That is, the toner that remains on the developer roll 510 mainly is stripped from by the wall zone of toner supplying roller 550.
Toner supplying roller 550 and developer roll 510 are being assembled on the housing 540 under the state of pushing mutually.Therefore, the roller portion of toner supplying roller 550 contacts with developer roll 510 under the state of elastic deformation.In addition, axis body is positioned at the below of the rotary middle spindle of developer roll 510.Toner supplying roller 550 is gone up rotation in the direction opposite with the sense of rotation (being counterclockwise) of developer roll 510 (being clockwise direction in Fig. 4) in Fig. 4.In the present embodiment, between toner supplying roller 550 and developer roll 510, be provided with difference, 1.5 times of the surperficial translational speed of the developer roll 510 when the surperficial translational speed of the toner supplying roller 550 during toner supplying roller 550 rotation approximately is developer roll 510 rotations.
Last sealing 520 axially contacts with developer roll 510 along developer roll 510, allows to move in housing 540 by the toner T that remains in after the developing location on the developer roll 510, and the toner T in the restriction housing 540 moves outside housing 540.Should go up sealing 520 and be the film that constitutes by polyethylene film etc.Last sealing 520 is gone up sealing support 526a supporting by frame (holder), and its length direction be configured to along developer roll 510 axially.Last sealing 520 and developer roll 510 contacted contact positions are positioned at the top of the central shaft of developer roll 510.
In addition, the face (this face is called as opposing face 520c) and described the going up between the sealing support 526a of the opposition side of the surface of contact 520b that contact with developer roll 510 of last sealing 520, be provided with by upward sealing of constituting of scum rubber (Moltopren) elastic body of etc.ing with compressive state and suppress parts 524.Should go up sealing and suppress parts 524, will go up sealing 520 thus and press to developer roll 510 in that sealing 520 is suppressed to developer roll 510 1 sides.
Axial end from developer roll 510 contacts with developer roll 510 up to the whole zone of the other end limiting scraper 560 by contact site 562a, the bed thickness that is carried on the toner T on the developer roll 510 is limited, and apply electric charge to the toner T that is carried on the developer roll 510.As shown in Figure 4, this limiting scraper 560 has rubber section 562 and rubber bearing portion 564.
Rubber section 562 is made of silicon rubber, urethane rubber etc., and contacts with developer roll 510.
Rubber bearing portion 564 is made of thin plate 564a and the 564b of thin-plate supporting portion, comes support rubber portion 562 by its end 564d (being the end of thin plate 564a side) transversely.Thin plate 564a is made of phosphor bronze, stainless steel etc., and has elasticity.Thin plate 564a support rubber portion 562, and by its elastic force pressure rubber section 562 is pressed on the developer roll 510.The 564b of thin-plate supporting portion is the metallic sheet material that is configured in the other end 564e transversely of rubber bearing portion 564.The side bearing of described thin plate 564a rubber section 562, and that end of its opposition side is supported by the described thin-plate supporting 564b of portion, thereby under this state the described thin-plate supporting 564b of portion is being installed on this thin plate 564a.
Limiting scraper 560 with that end 564b of thin-plate supporting portion side opposition side, be that front end 560a does not contact with developer roll 510, the part (being contact site 562a) of leaving predetermined distance with this front end 560a contacts with developer roll 510 with certain contact width.That is, limiting scraper 560 is not at the edge but contacts with developer roll 510 that plane (being the plane of rubber section 562 specifically) the contact developer roll 510 that is had by limiting scraper 560 limits described bed thickness near its belly.In addition, limiting scraper 560 is configured towards the mode of the upstream side of the sense of rotation of developer roll 510 with its front end 560a, promptly so-called reverse contact.The contact position of limiting scraper 560 contact developer rolls 510 is below the central shaft of developer roll 510, and below the central shaft of toner supplying roller 550.In addition, this limiting scraper 560 also can be brought into play the function that preventing that toner T from leaking from toner accommodating body 530 by along axially being in contact with it of developer roll 510.
(the action example of developing apparatus)
In the yellow developing apparatus 54 that constitutes like this, the toner T that toner supplying roller 550 will be contained in the toner accommodating body 530 is supplied to developer roll 510.The toner T that supplies with developer roll 510 arrives the contact position of limiting scraper 560 along with the rotation of developer roll 510, when by this contact position bed thickness is limited, and apply electric charge simultaneously.The toner T that has been limited bed thickness and has applied on the developer roll 510 of electric charge arrives the developing position relative with photoreceptor 20 by being further rotated of developer roll 510, is used under the effect of this developing location at alternating electric field the sub-image that is formed on the photoreceptor 20 being developed.The toner T that has crossed along with being further rotated of developer roll 510 on the developer roll 510 of developing location passes by sealing 520, and is recycled in the developing apparatus, rather than is swept by last sealing 520.In addition, the toner T that still remains on the developer roll 510 is peeled off by described toner supplying roller 550.
(surface configuration of developer roll 510)
The surface configuration of developer roll 510 is described below with reference to Fig. 5 to Fig. 8.Fig. 5 is the schematic perspective view of developer roll 510, and it shows recess 518.Fig. 6 is the front schematic view of developer roll 510.Fig. 7 is the synoptic diagram that the surface of developer roll 510 is shown, and it amplifies part A shown in Figure 6.Fig. 8 is the synoptic diagram that the cross sectional shape of protuberance 519 and recess 518 is shown.
In Fig. 5～Fig. 7, represent the axial of developer roll 510 with arrow, in Fig. 8, represent the length direction of the first recess 518a with arrow.In addition, in Fig. 5～Fig. 8, for the ease of understanding accompanying drawing, the ratio of protuberance 519 grades is different from actual conditions.In addition, in Fig. 6 and Fig. 7, the direction of arrow shown in the mark X is represented the length direction of the first recess 518a, and the direction of arrow shown in the mark Y is represented the length direction of the second recess 518b.Figure 8 illustrates along the cross section of the length direction of the first recess 518a shown in the mark Y among Fig. 6.In addition, when when the length direction of the second recess 518b shown in the mark X of Fig. 6 is got the cross section of protuberance 519 and recess 518, the cross sectional shape of this protuberance 519 and recess 518 is identical with the cross sectional shape of recess 518 with protuberance 519 shown in Figure 8.
As shown in Figure 5 and Figure 6, developer roll 510 has cylindrical portion 510a and axial region 510b.Cylindrical portion 510a carries toner-particle in its surface.This cylindrical portion 510a is formed by homogenous materials such as aluminium alloys, is formed with the concavo-convex Ministry of worker 512 and the non-concavo-convex Ministry of worker 514 that adds of adding in its surface.Axial region 510b is positioned at the axial both ends of developer roll 510, and is bearing on the housing 540 by not shown bearing.
The concavo-convex Ministry of worker 512 that adds is parts that are located axially at central portion at developer roll 510, implements concavo-convex processing (concavo-convex protuberance 519 that adds the Ministry of worker 512 and recess 518 are all being brought into play the function of the toner supporting part that is used to carry toner-particle (toner T)) in its surface for suitable carrying toner T.In the present embodiment, as this concavo-convex processing use is that so-called rolling forming processing (is processed for rolling forming, to in one of the manufacture method of developer roll 510 described later, be described in detail), on the concavo-convex surface that adds the Ministry of worker 512, form recess 518 and protuberance 519 by this rolling forming processing.Say that more specifically form groove by rolling forming processing on the concavo-convex surface that adds the Ministry of worker 512, thus, the concavo-convex Ministry of worker 512 that adds has had recess 518 and protuberance 519.
As shown in Figure 5, recess 518 be with respect to developer roll 510 axially and circumferencial direction has and at the spiral slot part of described axial equal intervals formation.This recess 518 forms two types (the first recess 518a and second recess 518b) by making with respect to developer roll 510 axially different with the angle of circumferencial direction inclination.
That is, the first recess 518a forms spirality in the mode that axially is 45 degree in the counterclockwise direction with developer roll 510, and the second recess 518b forms spirality in the mode that axially is 45 degree in the clockwise direction with developer roll 510.Therefore, the angle of reporting to the leadship after accomplishing a task of the first recess 518a and the second recess 518b is 90 degree.In addition, the first recess 518a and the second recess 518b developer roll 510 axially on spacing equate, in the present embodiment, be approximately 112 μ m as shown in Figure 7.
As shown in Figure 6, protuberance 519 is surrounded by described two types recess (i.e. the first recess 518a and the second recess 518b).The side 519b that this protuberance 519 has end face 519a and links to each other with this end face 519a.
With shown in Figure 8, end face 519a has flat.As shown in Figure 7, the shape of this end face 519a is roughly square.End face 519a forms in the following manner, that is: a diagonal line in foursquare two diagonal line of this end face 519a along developer roll 510 axially, another diagonal line is along the circumferencial direction of developer roll 510.In addition, the width H of end face 519a is more than the volume average particle size of toner-particle (7 μ m), is approximately 30 μ m in the present embodiment.
As shown in Figure 8, side 519b links to each other with the planar bottom surface 518c of recess 518 and with respect to the inclined-plane of this bottom surface 518c run-off the straight.And below 45 degree, in the present embodiment, described pitch angle is 45 degree to side 519b with respect to the pitch angle (angle that mark β represents among Fig. 8) of the bottom surface 518c of recess 518.
In addition, as shown in Figure 8, be formed with fillet 519d at the connecting portion 519c place of end face 519a and side 519b.The radius-of-curvature of this fillet 519d is over half the volume average particle size (7 μ m) of toner-particle, is 20 μ m in the present embodiment.In the present embodiment, as shown in Figure 8, the cross sectional shape of fillet 519d is for connecting the circular arc of end face 519a and side 519b.In this case, the size of above-mentioned radius-of-curvature is identical with the radius of this circular arc.
In addition, the height of protuberance 519 (degree of depth of recess 518), be that the distance of bottom surface 518c of the end face 519a of protuberance 519 and recess 518 is below the twice of the volume average particle size (7 μ m) of toner-particle.In the present embodiment, because the degree of depth of recess 518 is approximately 7 μ m, therefore identical with the volume average particle size size of toner-particle.In addition, the width of recess 518 is approximately 30 μ m, and the angle of the v-groove (angle shown in the mark α among Fig. 8) is approximately 90 degree.
As shown in Figure 6, the non-concavo-convex Ministry of worker 514 that adds is parts of not implementing above-mentioned concavo-convex processing (rolling forming processing) in its surface.This non-concavo-convex Ministry of worker 514 that adds adds between the Ministry of worker 512 and the axial region 510b in that being located axially at of developer roll 510 is concavo-convex, and its surface is in smooth state (10 mean roughness Rz on this surface are below 1 μ m).
(manufacture method of developer roll 510)
Below, utilize Fig. 9, Figure 10 A～Figure 10 E and Figure 11 to illustrate to have above-mentioned surface configuration the manufacture method of the developer roll 510 of (recess 518 and protuberance 519).Fig. 9 is the process flow diagram that the manufacture method of developer roll 510 is shown.Figure 10 A～Figure 10 E is the transformation synoptic diagram of the developer roll 510 in the manufacturing process of developer roll 510.Figure 11 is the key diagram that is used to illustrate the rolling forming processing of developer roll 510.Shown in Figure 10 A～Figure 10 C is the cross section of tubing 600, and shown in Figure 10 D and Figure 10 E is the periphery of tubing 600.
At first, shown in Figure 10 A, preparation is as the tubing 600 (step s102) of the base material of the cylindrical portion 510a of developer roll 510.The wall thickness of this tubing 600 is 0.5～3mm.
Then, shown in Figure 10 B, make flange at the both ends of the length direction of this tubing 600 and be pressed into portion 602 (step s104).This flange is pressed into portion 602 and makes by cut.
Then, shown in Figure 10 C, the flange 604 that constitutes the axial region 510b of developer roll 510 is pressed into this flange is pressed into portion 602 (step s106).For flange 604 is fixed on the tubing 600 reliably, after being pressed into flange 604, can be with flange 604 bonding or be welded on the tubing 600.
Then, shown in Figure 10 D, on the surface of the tubing 600 that has been pressed into flange 604, implement centreless grinding (step s108).Spread all over the whole surface on this surface and implement this centreless grinding, 10 mean roughness Rz on this surface behind the centreless grinding become below the 1.0 μ m.
Then, shown in Figure 10 E,, process by rolling forming and to form recess 518 and protuberance 519 (step s110) in the described concavo-convex part that adds the Ministry of worker 512 that is equivalent to of the tubing 600 that has been pressed into flange 604.In the present embodiment, implement to have used the so-called through type rolling forming processing (being also referred to as the step-by-step movement rolling and processing) of two round moulds 650,652.
Promptly, as shown in figure 11, two round moulds 650,652 with clamping as the mode of the described tubing 600 of workpiece and dispose, with predetermined pressure (direction of in Figure 11, representing this pressure) these two round moulds 650,652 are being pressed under the state of this tubing 600, making these two round moulds 650,652 go up rotation in same direction (with reference to Figure 11) with mark P.Have protruding 650a, the 652a that is used to form recess 518 on the surface of circle mould 650,652, this projection 650a, 652a make tubing 600 distortion, thereby form recess 518 and protuberance 519 on tubing 600.In addition, in the processing of through type rolling forming, by the rotation of circle mould 650,652, tubing 600 in (with reference to Figure 11) rotation, moves on the direction of representing with mark H in Figure 11 on the direction opposite with the sense of rotation of circle mould 650,652.So, be equivalent to the described concavo-convex part that adds the Ministry of worker 512, by the described first recess 518a in the protruding 650a formation recess 518 of circle mould 650, by the described second recess 518b in the protruding 652a formation recess 518 of circle mould 652.In addition, as previously mentioned, be formed with fillet 519d (Fig. 8) at the connecting portion 519c place of the protuberance 519 of developer roll 510, the protruding 650a and the protruding 652a of circle mould are the shape that forms described fillet 519d.
In the manufacture method of above-mentioned developer roll 510, form protuberance 519 on the surface of developer roll 510 by rolling forming processing (step s110), this protuberance 519 possesses the width of end face 519a with flat and this end face 519a more than the volume average particle size of toner-particle.
(validity of the developing apparatus in the present embodiment)
As mentioned above, the toner-particle bearing roller (developer roll 510) of the developing apparatus 51,52,53,54 of present embodiment has protuberance 519, as shown in Figure 8, this protuberance 519 possesses the width H of end face 519a with flat and this end face 519a more than the volume average particle size of toner-particle.Can suppress the distortion of toner-particle etc. thus.Be elaborated below.
When on the surface of developer roll 510, forming protuberance, sometimes because the shape of this protuberance and by the by-local forces what of protuberance to toner-particle.For example, at described protuberance relatively under the situation of point, when this protuberance contact toner-particle, sometimes by the concentration of local acting force of protuberance to toner-particle.Like this, when during to the concentration of local acting force of toner-particle, the danger that causes toner distortion or toner-particle to break because of this acting force being arranged by protuberance.
To this, shown in present embodiment, possess in setting under the situation of the protuberance 519 more than the volume average particle size of width of end face 519a with par and this end face 519a at toner-particle, when described end face 519a contact toner-particle, by protuberance 519 (end face 519a) to the toner-particle dissipation of ferees.Thereby, according to the developer roll 510 of present embodiment, can suppress, and can suppress distortion of the toner-particle that causes because of this power etc. by the concentration of local acting force of protuberance 519 to toner-particle.
(relation of recess 518 and sub-image)
As previously mentioned, laser beam printer uses laser beam to form sub-image on photoreceptor 20, and makes formed sub-image as the toner picture and visual by being carried on toner on the developer roll 510.This moment is on photoreceptor 20, by opening/closing laser beam scanned and be divided into cancellate zone, be that so-called screen (screen) go up to form the point-like sub-image on main scanning direction.Then, constitute sub-image by these point-like sub-images.
In addition, shown in present embodiment,, for example can worry to enter the toner-particle T of recess 518 more than the toner-particle T that enters protuberance 519 for the recess 518 with clearly division and the developer roll 510 of protuberance 519.In this case, worry in the toner picture that position of developing by recess 518 and the position density of developing by protuberance 519 are different.Particularly, though smaller for the large-area image influence of not having as letter or lines, have the larger area image for photo or illustration etc., then manifest density unevenness easily.This phenomenon is particularly evident under the grid situation at interval of the axially spaced-apart that is formed on the recess 518 on the developer roll 510 greater than the main scanning direction (corresponding to the axial direction of developer roll 510) of described screen.Even the original point that is formed by equal densities also can be owing to being that recess 518 by developer roll 510 develops or develops by protuberance 519 and produces the density difference.
Therefore, in the developer roll 510 of present embodiment, the long spacing of the grid of the axial spacing of recess 518 when forming photo or illustration etc. and have the image of area.Here, the lattice spacing of the main scanning direction (with the axial corresponding direction of developer roll 510) of the sub-image when forming photo or illustration etc. and having the image of area is not the laser beam printer dot spacing that can form the image of highest resolution (, grid can form polytype spacing on main scanning direction (axially)).This be for: when forming photo or illustration etc. by laser beam printer and have the larger area image, form a little by the low resolution that is lower than the highest resolution that printer has, and improve whole picture element by have contrast at each point.
Figure 12 is the figure that is used for illustrating the spacing of screen and sub-image.As shown in the figure, for example the highest resolution at printer is under the situation of 600dpi (spacing is 42.5 μ m), and when the resolution with sub-image was made as 600dpi, it was the clathrate of 42.5 μ m that the area dividing that can form the point-like sub-image becomes spacing.Therefore, in the zone of each division, can only show contrast (Figure 12 epimere) by having or not of point-like sub-image.
Therefore, when formation has the larger area image, for example, with three point-like sub-images of resolution 600dpi as a point-like sub-image, and semiconductor laser changes the time span that gives off laser beam in the time that can respond three point-like sub-images, shows contrast (Figure 12 hypomere) thus in resolution 600dpi.At this moment, the resolution that forms when having the larger area image is 200dpi, and the zone that can form the point-like sub-image is divided into the clathrate that spacing is 127.5 μ m.Therefore, as shown in Figure 8, in the developer roll 510 of present embodiment, be made as about 112 μ m by spacing with axial recess 518, each point-like sub-image that be formed on 200dpi, promptly is divided into the sub-image in the cancellate zone that spacing is 127.5 μ m comprises the recess 518 of developer roll 510 and develop in the position of protuberance 519 at all, produces density unevenness thereby can be suppressed in the toner picture of development.
In the present embodiment, illustrational situation is: the highest resolution of laser beam printer is 600dpi, the axial spacing that can form the point-like sub-image when forming image such as photo and be divided into cancellate zone is 127.5 μ m, and the axial spacing of the recess 518 of developer roll 510 is 112 μ m.But the invention is not restricted to this situation, the axial spacing of the recess 518 of developer roll 510, and the sub-image when forming image such as photo form the point-like sub-image and be divided into the axial spacing in cancellate zone also can be smaller.
Other embodiments (second embodiment to the, four embodiments etc.)
Abovely developing apparatus of the present invention has been described, but above-mentioned embodiments of the present invention only are for the easy to understand embodiments of the present invention, the present invention are not limited according to above-mentioned embodiment.Can carry out changes and improvements to the present invention under the prerequisite that does not break away from purport of the present invention, certainly, the present invention also comprises its equivalent.
In the above-described embodiment, as image processing system, full-color laser beam printer with the intermediate transfer type is that example is illustrated, but the present invention is also applicable in the various image processing systems such as the full-color laser beam printer outside the intermediate transfer type, black and white laser beam printer, duplicating machine and facsimile recorder.
In addition, for photoreceptor, also being not limited on the outer peripheral face of cylindrical shape conductive substrate photographic layer is set and the so-called light-sensitive roller that constitutes, also can be on the surface of the conductive substrate of band shape photographic layer to be set and the so-called sensitization band that constitutes.
In addition, in the above-described embodiment, be that 7 μ m are that example is illustrated with the volume average particle size of toner-particle, but be not limited thereto that the volume average particle size of toner-particle also can be 5～10 μ m.
In addition, in the above-described embodiment, as shown in Figure 4, developing apparatus 51,52,53,54 has the layer-thickness restriction member (limiting scraper 560) that all contacts and be used to limit the bed thickness that is carried on the toner-particle on this developer roll 510 from an axial end of developer roll 510 in the gamut of the other end with this developer roll 510.The plane that limiting scraper 560 is had by this limiting scraper 560 contacts with developer roll 510 limits described bed thickness.But be not limited to the above.For example, limiting scraper 560 also can limit described bed thickness by edge contact developer roll 510.
When limiting scraper 560 limited described bed thickness by edge contact developer roll 510, the toner that is carried on the protuberance 519 was swept by this limiting scraper 560.To this, shown in above-mentioned embodiment, contact under the situation that limits described bed thickness with developer roll 510 on the plane that is had by limiting scraper 560, because limiting scraper 560 is pressed to protuberance 519 (end face 519a) with toner-particle, therefore, toner-particle is difficult to be limited scraper plate 560 and sweeps.When limiting scraper 560 is pushed toner-particle, easily by protuberance 519 to the toner-particle acting force that is carried on this protuberance 519.Therefore, in these cases, the effect that the effect that has the protuberance 519 of end face 519a and bring is set on the surface of developer roll 510, promptly can suppress the distortion etc. of toner-particle will be more effective.Thereby above-mentioned embodiment is more preferred.
In addition, in the above-described embodiment, as shown in Figure 8, protuberance 519 has the side 519b that is connected with end face 519a.Connecting portion 519c place at end face 519a and side 519b is formed with fillet 519d.But be not limited to the above.For example shown in Figure 13, also can not form fillet 519d on this connecting portion 519c, but form the angle.
Form at connecting portion 519c under the situation at angle, when toner-particle and this angular contact, easy by concentration of local acting force as the angle toner-particle at edge.In contrast, when forming fillet 519d,, therefore, can alleviate the power to the toner-particle effect by connecting portion 519c owing to do not form the edge at connecting portion 519c at connecting portion 519c place.Thus, from suppressing the distortion equal angles of toner-particle, above-mentioned embodiment is more preferred.
Here, the surface structure to the developer roll 510 of variation shown in Figure 13 describes.Figure 13 is the synoptic diagram of the variation of developer roll 510, is the synoptic diagram that the cross sectional shape of protuberance 519 is shown.Except connecting portion 519c becomes the angle, developer roll 510 shown in Figure 13 has the surface structure (that is, having protuberance 519 and recess 518) identical with developer roll shown in Figure 8 510.Therefore, as shown in figure 13, the developer roll 510 of variation also has plane 519a.The width H of this end face 519a is (specifically, described width H is about 36 μ m) more than the volume average particle size of toner-particle.
In addition, in the above-described embodiment, as shown in Figure 8, the radius-of-curvature of fillet 519d is over half the volume average particle size of toner-particle, but is not limited thereto.For example, the radius-of-curvature of fillet 519d also can be less than half of the volume average particle size of toner-particle.
Under the radius-of-curvature of fillet half situation less than the volume average particle size of toner-particle, when toner-particle contact fillet, sometimes because this fillet is invaded in toner-particle by the concentration of local acting force of fillet to toner-particle.Relative with it, shown in above-mentioned embodiment, when the radius-of-curvature of fillet 519d is volume average particle size over half of toner-particle, owing to do not worry that fillet 519d can invade in the toner-particle, therefore, power is to affact on the toner-particle from fillet 519d dispersedly.Therefore, from the angle of the distortion that can suppress toner-particle etc., above-mentioned embodiment is more preferred.
In addition, in the above-described embodiment, as shown in Figure 8, the degree of depth of recess 518 but is not limited thereto below the twice of the volume average particle size of toner-particle.For example, the degree of depth of recess 518 also can be greater than the twice of the volume average particle size of toner-particle.
When the degree of depth of recess 518 when the twice of the volume average particle size of toner-particle is following, although the toner-particle in recess 518 between developer roll 510 and limiting scraper 560 is many, but all can touch some at least in developer roll 510 and the limiting scraper 560, thereby the charging property of toner-particle is suitable.In this, above-mentioned embodiment is more preferred.When the degree of depth of recess 518 when the volume average particle size of toner-particle (a times) is following, though the toner-particle in recess 518 between developer roll 510 and limiting scraper 560 is many, but it is all can touch developer roll 510 and limiting scraper 560 both sides, thereby more preferred.
In addition, as other preferred implementations, can enumerate second embodiment shown below and the 4th embodiment (for convenience, below above-mentioned embodiment being called first embodiment).
(second embodiment)
(topology example of the developer roll 510 of the developing apparatus of second embodiment)
The topology example of developer roll 510 of the developing apparatus of second embodiment is described with reference to Figure 14 here.Figure 14 is equivalent to Fig. 8, is the synoptic diagram that the cross sectional shape of the protuberance of second embodiment and recess is shown.
By comparison diagram 8 and Figure 14 as can be known, the difference of the developer roll 510 of the developer roll 510 of the developing apparatus of second embodiment and the developing apparatus of first embodiment is protuberance.
As shown in figure 14, the protuberance 1519 of second embodiment has fillet 1519d at its top ends 1519a place.The radius-of-curvature of fillet 1519d is set at volume average particle size (7 μ m) over half of toner-particle.
Protuberance 1519 has the side 1519b that is connected with top ends 1519a.In the 1519b of this side, be smooth towards the part of top ends 1519a from the bottom 1519c of protuberance.As shown in figure 14, side 1519b is the inclined-plane that is connected with the planar bottom surface 1518c of recess 1518 and tilts with respect to this bottom surface 1518c.And below 45 degree, in the present embodiment, described pitch angle is 45 degree to side 1519b with respect to the pitch angle (angle of representing with mark β among Figure 14) of the bottom surface 1518c of recess 1518.In the present embodiment, as shown in figure 14, the cross sectional shape of fillet 1519d is for connecting the circular arc of two side 1519b.In this case, the size of above-mentioned radius-of-curvature is identical with the radius of this circular arc.In addition, the height of protuberance 1519 (degree of depth of recess 1518) is below the twice of the volume average particle size (7 μ m) of toner-particle.
In addition, the developer roll 1510 that is formed with protuberance 1519 is in its surface made by described manufacture method (rolling forming processing), and the radius-of-curvature that described protuberance 1519 has fillet 1519d and this a fillet 1519d at its top ends 1519a at least is over half the volume average particle size of toner-particle.
(validity of the developing apparatus of second embodiment)
As mentioned above, the toner-particle bearing roller of the developing apparatus of second embodiment (developer roll 510) has protuberance 1519, as shown in figure 14, this protuberance 1519 radius-of-curvature of having fillet 1519d and this a fillet 1519d at its top ends 1519a at least over half in the volume average particle size of toner-particle.Can suppress the distortion of toner-particle etc. thus.Be elaborated below.
When on the surface of developer roll 510, forming protuberance, sometimes because the shape of this protuberance and by the by-local forces what of protuberance to toner-particle.For example, in the top ends of described protuberance relatively under the situation of point, when this top ends contact toner-particle, sometimes by the concentration of local acting force of top ends to toner-particle.Like this, when during to the concentration of local acting force of toner-particle, the danger that causes toner distortion or toner-particle to break because of this acting force being arranged by protuberance.
To this, shown in present embodiment, protuberance 1519 possesses fillet 1519d and this fillet 1519d at least at top ends 1519a place radius-of-curvature is over half the volume average particle size of toner-particle, in the case, when this fillet 1519d contact toner-particle, power is affacted on the toner-particle from protuberance 1519 (fillet 1519d) dispersedly.Thereby, according to the developer roll 510 of present embodiment, can suppress, and can suppress distortion of the toner-particle that causes because of this power etc. from the concentration of local acting force of protuberance 1519 to toner-particle.
(the 3rd embodiment)
(topology example of the developer roll 510 of the developing apparatus of the 3rd embodiment)
The topology example of developer roll 510 of the developing apparatus of the 3rd embodiment is described with reference to Figure 15 to Figure 17 here.Figure 15 is the schematic perspective view of developer roll 510.Figure 16 is the front schematic view of developer roll 510.Figure 17 is the synoptic diagram that the cross sectional shape of the lip-deep recess 2516 that is located at developer roll 510 is shown, and it shows in Figure 16 the cross section with the direction shown in mark X or the mark Y.In addition, in Figure 15～Figure 17, in order to understand accompanying drawing easily, the ratio of recess 2516 grades is with in kind different.
The developer roll 510 of the developing apparatus of the 3rd embodiment is the parts that are made of aluminium alloy, ferroalloy etc., carries toner T in its surface and it is transported to the developing location relative with photoreceptor 20.
As Figure 16 and shown in Figure 17, for suitable carrying toner on the surface of developer roll 510, and recess 2516 and non-recess 2519 (recess 2516 and non-recess 2519 all have the effect as the toner supporting part that is used to carry toner) are set at its surperficial central portion 2510a.In the present embodiment, recess 516 and non-recess 519 on the central portion 510a that processes the surface that is formed on developer roll 510 by aforesaid rolling forming are described.
Recess 2516 is in the low-lying part of going of the central portion 510a on the surface of developer roll 510, have flat bottom surface 2517 and with the side 2518 of this bottom surface adjacency.
In the present embodiment, as shown in figure 17, the A/F of recess 2516 and the degree of depth are about 80 μ m, 7 μ m respectively.In addition, the angle of the v-groove of recess 2516 (angle shown in the mark α among Figure 17) is approximately 90 degree.In addition, boundary portion in described bottom surface 2517 and described side 2518 is provided with fillet, the radius of curvature R of this fillet is over half the volume average particle size (being about 7 μ m in the present embodiment) of toner T (in the present embodiment, toner T is a graininess).
Non-recess 2519 is the tabular surfaces of highest position that are arranged in the surperficial central portion 510a of developer roll 510.As shown in figure 17, non-recess 2519 is being located and described side 2518 adjacency with the position (open side of recess 2516) of the opposite side of described bottom surface 2517.In addition, the boundary portion in non-recess 2519 and described side 2518 is provided with fillet, and the radius of curvature R of this fillet is over half the volume average particle size of toner T.
In the present embodiment, as Figure 15 and shown in Figure 16, the recess 2516 that is formed on the surperficial central portion 510a of developer roll 510 by rolling forming processing form two helicla flutes that winding directions differ from one another (below, be called the first groove 2516a with one in this helicla flute, another is called the second groove 2516b).That is, in Figure 16, the recess of arranging on the cross section of directions X 2516 belongs to the first groove 2516a, and the recess of arranging on the cross section of Y direction 2516 belongs to the second groove 2516b.Here, as shown in figure 16, the length direction of the first groove 2516a and the second groove 2516b is about 45 degree respectively with the axial acute angle that becomes of developer roll 510.In addition, the helix pitch of the first groove 2516a and the second groove 2516b (length of representing for mark L in Figure 17) is uniformly-spaced.
In the present embodiment, as recess 2516, on the surperficial central portion 510a of developer roll 510, formed two helicla flutes that winding direction differs from one another, but be not limited thereto.For example, among the described first groove 2516a and the second groove 2516b a certain also can only be set.
In addition, for the developer roll 510 of realizing present embodiment, add man-hour employed round mould 650,652 and also can use as bed die (for example rounding mould) as implementing the through type rolling forming, this mould has half the fillet of radius-of-curvature greater than the volume average particle size of toner at the edge part of its protuberance 650a, 652a.
(validity of the developing apparatus in the 3rd embodiment)
As mentioned above, the developer roll 510 of present embodiment has recess 2516 in its surface, described recess 2516 have flat bottom surface 2517 and with the side 2518 of this bottom surface adjacency, and be provided with the over half fillet of radius of curvature R in the volume average particle size of toner in the boundary portion of this bottom surface and this side.Thus, can realize the developer roll that can suitably suppress to the delay of toner.
That is, as previously mentioned,, on the surface of developer roll 510, be provided with recess 2516 for suitable carrying toner, this recess 2516 have planar bottom surface 2517 and with the side 2518 of this bottom surface adjacency.
But in the past, the boundary portion in described bottom surface 2517 and described side 2518 is provided with the angle, and therefore toner, particularly powdery toner take place is trapped in the problem of described boundary portion.Here, with reference to Figure 18 this problem is described.Figure 18 is the key diagram that is used for illustrating the problem that the recess 2516 that had at the developer roll 510 of example is in the past produced.
As shown in figure 18, the planar bottom surface 2517 that is had at recess 2516 and have under the situation at angle with the boundary portion of the side 2518 of this bottom surface adjacency, because at this place, angle, the toner of toner, particularly powdery and rotation in recess 2516, and not bigger with particle volume diameter toner (hereinafter referred to as big particle diameter toner) contacts, thereby can not discharge by this big particle diameter, the result just is trapped in the recess 2516.
And the recess 2516 that the developer roll 510 of present embodiment is had can address the above problem.Be explained with reference to Figure 19.Figure 19 is the key diagram that is used to illustrate the validity of the recess 2516 that the developer roll 510 of present embodiment is had.
As shown in figure 19, be provided with fillet in the described bottom surface 2517 of recess 2516 and the boundary portion of described side 2518, the radius of curvature R of this fillet is over half the volume average particle size of toner.If the recess of this structure 2516, then most big particle diameter toners with rotate when described boundary portion contacts, therefore, can little toner suitably be arranged outside to recess 2516 by big particle diameter toner.Thereby can suitably suppress the delay of toner.
In the present embodiment, as shown in figure 17, the adjacent side 2518 and be provided with the over half fillet of radius of curvature R with being arranged on planar bottom surface 2517 in the recess 2516 in the volume average particle size of toner with the boundary member of the non-recess 2519 of this side adjacency, but be not limited to this.For example in Figure 17, also can have the angle in the boundary portion of described non-recess 2519 and described side 2518.But in this case, can be from the concentration of local imposed stress of angle toner, thus under the effect of this stress, may cause the distortion of toner.
Relative with it, when the boundary member at described side 2518 and described non-recess 2519 is provided with the over half fillet of curvature R in the volume average particle size of toner, at described boundary member, effect is disperseed for the power of toner, thereby can suppress the distortion of toner.In this point, present embodiment is more preferred.
(other recess shapes)
In above-mentioned, as the recess of the delay of suitable inhibition toner, to having planar bottom surface 2517 and being provided with radius of curvature R with the side 2518 of this bottom surface adjacency and boundary portion and being illustrated greater than half the recess (present embodiment relevant) of fillet of the volume average particle size of toner with second embodiment in this bottom surface and this side.But present embodiment can be considered other example as an example of the recess of the delay that suitably suppresses toner.In this, describe having the recess (embodiment relevant) that is different from this routine shape with second embodiment.Figure 20 is equivalent to Figure 16, is the front schematic view of the developer roll 510 of this variation.Figure 21 is the synoptic diagram of cross sectional shape that the recess 2580 of this variation is shown, and the cross section of the direction of representing along mark X or mark Y is shown among Figure 20.And, in Figure 20 and Figure 21, the ratio of recess 2580 grades and in kind different.
The recess 2580 of this variation has part (hereinafter referred to as plane rake) 2581a, the 2582a that is plane inclination in the surperficial central portion 510a of developer roll 510, and has first side 2581 respect to one another and second side 2582.
In this variation, on the surperficial central portion 510a of developer roll 510, there is not the position that is equivalent to non-recess 2519.As shown in figure 21, another recess 2583 on recess 2580 and its next door is adjacent.That is, first side 2581 and the 3rd side 2584 are in top (open side) adjacency of recess 2580 and another recess 2583.Another recess 2583 possesses the 3rd side 2584 respect to one another and the 4th side 2585, and is identical with described recess 2580, and the 3rd side 2584 and the 4th side 2585 have plane rake 2584a, 2585a respectively.
In the present embodiment, as shown in figure 21, the A/F of recess 2580 and the degree of depth are about 80 μ m, 7 μ m respectively.In addition, the angle of the v-groove of recess 2580 (angle shown in the mark α among Figure 21) is approximately 110 degree.In addition, the boundary portion in described first side 2581 and described second side 2582 is provided with fillet, and the radius of curvature R of this fillet is over half the volume average particle size of toner-particle.
In addition, the boundary portion in described first side 2581 and described the 3rd side 2584 also is provided with the over half fillet of radius of curvature R in the volume average particle size of toner, but is not limited thereto.For example in Figure 21, the boundary portion of described first side 2581 and described the 3rd side 2584 also can have the angle.But from suppressing the above-mentioned viewpoint of toner distortion, the mode of this variation is more preferred.
In addition, in the present embodiment, as Figure 20 and shown in Figure 21, the described recess 2580 that is formed on the surperficial central portion 510a of developer roll 510 is identical with present embodiment, is formed with the mutually different first groove 2580a of winding direction and the second groove 2580b.That is, in Figure 20, the recess of arranging on the cross section of directions X 2580 belongs to the first groove 2580a, and the recess of arranging on the cross section of Y direction 2580 belongs to the second groove 2580b.
In addition, here, as shown in figure 20, the length direction of the first groove 2580a and the second groove 2580b is about 45 degree respectively with the axial acute angle that becomes of developer roll 510.In addition, the helix pitch of the first groove 2580a and the second groove 2580b (length of representing for mark L in Figure 21) is uniformly-spaced.
In addition, in order to realize the developer roll 510 in this variation, the same with present embodiment, add employed round mould 650,652 in man-hour as implementing the through type rolling forming, also can use as bed die (for example rounding mould), this mould has half the fillet of radius-of-curvature greater than the volume average particle size of toner at the edge part of its protuberance 650a, 652a.
(the 4th embodiment)
(structure example of the developer roll 510 of the developing apparatus of the 4th embodiment)
The structure example of developer roll 510 of the developing apparatus of the 4th embodiment here, is described with reference to Figure 22 to Figure 25.Figure 22 is the schematic perspective view of developer roll 510.Figure 23 is the front schematic view of developer roll 510.Figure 24 is the enlarged drawing that the central portion 510a of developer roll 510 has been carried out amplification.Figure 25 is the synoptic diagram that the shape of protuberance 3512, recess 3515 etc. is shown, and the last figure of Figure 25 schematically shows enlarged drawing shown in Figure 24.In addition, the following cross sectional shape that illustrates protuberance 3512, recess 3515 etc. of Figure 25.And in Figure 22, Figure 23, Figure 25, in order to understand figure easily, the ratio of protuberance 3512 grades is with in kind different.
The developer roll 510 carrying toner T of the developing apparatus of the 4th embodiment also are transported to the developing position relative with photoreceptor 20 with it.This developer roll 510 is the parts that are made of aluminium alloy, ferroalloy etc.
Extremely shown in Figure 25 as Figure 23, in order to make suitably carrying toner of developer roll 510, and have protuberance 3512, sidepiece 3514 and recess 3515 (in addition, protuberance 3512, sidepiece 3514 and recess 3515 are all being brought into play the function of the toner supporting part that is used to carry toner) in the central on the surface of the 510a of portion.
Protuberance 3512 is the highest parts among the central portion 510a, and shown in the last figure of Figure 25, it has foursquare flat shape.One side length L 1 of this square protuberance 3512 (with reference to figure below of Figure 25) is about 28 μ m.
Which side the direction of the average line of the roughness curve when in addition, the value of ten of this protuberance 3512 mean roughness Rz (JIS B 0601-1994 standard) basis is asked these 10 mean roughness Rz is arranged on upwards there is bigger difference.More specifically explanation, when the direction of this average line during along developer roll 510 axial, the value maximum of 10 mean roughness Rz of protuberance 3512, this value are about 2 μ m.And when the direction of described average line during along the circumferencial direction of developer roll 510, the value minimum of 10 mean roughness Rz of protuberance 3512, this value are about 0.5 μ m.That is, the surface of protuberance 3512 is described coarse on axially, and in coarse hardly on the described circumferencial direction (observed vertical line is promptly represented above-mentioned situation in protuberance shown in Figure 24 3512).
Sidepiece 3514 is the inclined-planes that connect protuberance 3512 and recess 3515, shown in the last figure of Figure 25, and each bar limit of the described square protuberance 3512 of correspondence and four sidepieces 3514 are set.The pitch angle of this sidepiece 3514 is about 45 degree shown in figure below of Figure 25.
As Figure 22 to shown in Figure 25, on the surface of the central portion 510a of developer roll 510 with netted a plurality of protuberances 3512 and four sidepieces 3514 (group) of disposing regularly.In addition, the spacing P of protuberance 3512 (with reference to figure below of Figure 25) is about 80 μ m.
Recess 3515 is parts minimum among the central portion 510a, as Figure 22 to shown in Figure 25, this recess 3515 surround protuberance 3512 and four sidepieces 3514 around, be netted formation regularly.This recess 3515 is set as spiral fashion, and its length direction (this direction is represented with mark Y with mark X in Figure 25) is about 45 degree with the axial acute angle that becomes of developer roll 510.In addition, the width of recess 3515 (lateral length) L2 (with reference to figure below of Figure 25) is about 28 μ m.
In addition, the depth D of recess 3515 (developer roll 510 radially in 3515 the length from protuberance 3512 to recess, with reference to figure below of Figure 25) be about 12 μ m.In addition, in the present embodiment, because toner T is graininess, and the volume average particle size of toner T is about 7 μ m, and therefore, the depth D of recess 3515 is at this more than volume average particle size and below the twice in this volume average particle size.
In addition, different with the situation of described protuberance 3512, no matter which direction is the direction of described average line be made as, the value of 10 mean roughness Rz of this recess 3515 is all about the same.This value is about 0.5 μ m.Like this, the maximal value of ten of recess 3515 mean roughness Rz (0.5 μ m) is littler than the maximal value (2 μ m) of 10 mean roughness Rz of protuberance 3512.And this maximal value of 10 mean roughness Rz of protuberance 3512 is below the volume average particle size of toner T.
In addition, on the surface of the central portion 510a with above-mentioned protuberance 3512, sidepiece 3514 and recess 3515, implement electroless Ni-P plating.
In addition, this developer roll 510 can be used in the method that describes in the manufacture method for developer roll 510 and carries out following manufacturing.
That is, shown in Figure 13 D, though implement centreless grinding on the surface of the tubing 600 that has been pressed into flange 604, in this centreless grinding, tubing is under by the state of the grinding stone clamping of a plurality of rotations, along the circumferential direction grinds by this grinding stone.Therefore, produce described vertical line along the circumferential direction on the surface of tubing 600, axially 10 the mean roughness Rz on are bigger than 10 mean roughness Rz on the circumferencial direction.
Spread all over the whole surface on described surface and implement centreless grinding, when the direction of the average line of the roughness curve in the time will asking 10 mean roughness Rz is made as along described axial direction, the value of 10 mean roughness Rz on the whole surface of this behind the centreless grinding is about 2 μ m, when the direction with described average line was made as direction along described circumferencial direction, the value of 10 mean roughness Rz on this whole surface was about 0.5 μ m.In addition, utilize 10 mean roughness Rz of the groove (that is, being equivalent to the part of described recess 3515 and sidepiece 3514) that the through type rolling forming is processed to form to be about 0.5 μ m with reference to figure below of Figure 25.
(validity of the developing apparatus of the 4th embodiment)
As mentioned above, the developer roll 510 of the 4th embodiment has the recess 3515 and the protuberance 3512 of rule configuration in its surface, and the maximal value of 10 mean roughness Rz of recess 3515 (0.5 μ m) is littler than the maximal value (2 μ m) of 10 mean roughness Rz of protuberance 3512.Can be suppressed in the toner picture thus gradation unequal takes place.
Promptly, as previously mentioned, under the relative state of developer roll 510 and photoreceptor 20, by the lip-deep toner that is carried on developer roll 510 sub-image that is carried on the photoreceptor 20 is developed, but the situation of the distance of toner that the distance that toner that the described recess 3515 of developer roll 510 carried and photoreceptor 20 sub-image that carries take place is sometimes carried greater than described protuberance 3512 and described sub-image.
So in this case, for the ratio of the toning dosage that arrives photoreceptor 20 with respect to the toning dosage that leaves developer roll 510 surfaces (recess 3515 or protuberance 3512), can be littler under the situation of recess 3515 than the situation of protuberance 3512, therefore, lighter than the density of the toner picture that on photoreceptor 20, forms by being carried on the toner on the protuberance 3512 by being carried on toner on the recess 3515 in the density of the toner picture that forms on the photoreceptor 20, thus may in the toner picture, produce gradation unequal.
To this, in the developer roll 510 of the 4th embodiment, because the maximal value of 10 mean roughness Rz of recess 3515 is littler (promptly than the maximal value of 10 mean roughness Rz of protuberance 3512, recess 3515 is smooth, protuberance 3512 is coarse), therefore, when carrying out the development of sub-image, the amount of toner of leaving recess 3515 is more than the amount of the toner that leaves protuberance 3512.Promptly, developer roll 510 according to present embodiment, the toning dosage that arrives photoreceptor 20 with respect to the less recess 3515 of the ratio of the toning dosage that leaves developer roll 510 surfaces in, can increase the toning dosage that leaves this surface (recess 3515), and in the bigger protuberance 3512 of described ratio, can reduce to leave the toning dosage of described surface (protuberance 3512), therefore, can make the toning dosage that leaves recess 3515 back arrival photoreceptors 20 consistent with the toning dosage that leaves protuberance 3512 back arrival photoreceptors 20.
Therefore, lighter than the density of the toner picture that on photoreceptor 20, forms by being carried on the toner on the protuberance 3512 by being carried on toner on the recess 3515 in the density of the toner picture that forms on the photoreceptor 20, thus can be suppressed at the described problem that produces gradation unequal in the toner picture.
(other embodiments relevant) with the 4th embodiment
In above-mentioned, when the direction of the average line of the roughness curve in the time will asking 10 mean roughness Rz is made as along the axial direction of developer roll 510,10 mean roughness Rz maximums of protuberance 3512, but be not limited thereto.For example, in the time of also can being made as direction along the circumferencial direction of developer roll 510 in direction with described average line for maximum.
In addition, in the above-described embodiment, when the direction of the average line of the roughness curve in the time will asking 10 mean roughness Rz was made as along the direction of the circumferencial direction of developer roll 510,10 mean roughness Rz of protuberance 3512 were minimum, but are not limited thereto.For example, in the time of also can being made as axial direction along developer roll 510 in direction with described average line for maximum.
When developer roll 510 when central shaft rotates, the lip-deep toner that is carried on the central portion 510a of developer roll 510 moves along the circumferencial direction of developer roll 510, but when the direction with described average line is made as direction along described circumferencial direction, under the bigger situation of 10 mean roughness Rz of protuberance 3512, can take place to be parked in phenomenon on the protuberance 3512 along the toner that described circumferencial direction moves.
Therefore, when the direction with described average line is made as direction along the circumferencial direction of developer roll 510,, then can suitably suppresses the generation of above-mentioned phenomenon, and can improve the rotation of toner if make 10 mean roughness Rz minimums of protuberance 3512.From this point, above-mentioned embodiment is more preferred.
In addition, in the above-described embodiment, the described maximal value of 10 mean roughness Rz of protuberance 3512 but is not limited thereto below the volume average particle size of toner, and the maximal value of 10 mean roughness Rz of protuberance 3512 also can be greater than the volume average particle size of toner.
But, being difficult to embed protuberance 3512 from toner, thereby the further angle that improves of rotation of toner is set out, above-mentioned embodiment is more preferred.
(the 5th embodiment)
(be located at the protuberance of the developer roll in the developing apparatus of the 5th embodiment and be located at relation between the wall zone of the toner supplying roller in this developing apparatus)
As mentioned above, developer roll 510 is supplied with toners from toner supplying roller 550, and by toner supplying roller 550 peel off to the sub-image on the photoreceptor 20 develop the back remaining toner.At this moment, be contained in toner among the hole 550c (with reference to Figure 26 to Figure 28) that toner supplying roller 550 had and mainly supplied to the surface of developer roll 510, the lip-deep toner that remains in the developer roll 510 that is connected with the wall zone 550d (with reference to Figure 26 to Figure 28) in a plurality of encirclements hole 550 is stripped from.In addition, on the surface of developer roll 510, be formed with a lot of foursquare protuberances 4512.Because the sub-image on the photoreceptor 20 is developed by the toner that is carried on the relative position in the developer roll 510, therefore, the slot part of developer roll 510 and protuberance 4512 all need to carry toner.
But when developer roll 510 and toner supplying roller 550 contacted, if the wall of toner supplying roller 550 zone 550d covers the whole surface of the protuberance 4512 of developer roll 510, the lip-deep toner that then has been capped the protuberance 4512 on whole surface was stripped from.Therefore, if the wall of toner supplying roller 550 zone 550d covers the whole zone on protuberance 4512 surfaces of developer roll 510, then can on the surface of developer roll 510, produce the position of not carrying toner, when sub-image is developed, can not be the position of toner picture because generation has to develop, density unevenness occurs thereby perhaps can produce the lower position of density.
Therefore, in the developing apparatus of present embodiment, this toner supplying roller 550 between the opening of the hole 550c of toner supplying roller 550 axially on mean distance littler than the axial breadth extreme of the end face 4512a of the protuberance 4512 of developer roll 510.With reference to Figure 26 this item is described.Figure 26 is the synoptic diagram of validity that is used to illustrate the developing apparatus of the 5th embodiment.
There is shown on the left side of Figure 26 the synoptic diagram that amplifies has been carried out in the cross section of the 550a of roller portion of toner supplying roller 550.Here, this toner supplying roller 550 between the opening of the hole 550c of toner supplying roller 550 axially on distance be meant: the distance of representing with mark Dx1, Dx2, Dx3, Dx4 among Figure 26 for example, in addition, the mean distance Dxave of this distance is meant: a plurality of (for example 20) this distance D x1, Dx2 ..., the mean value of Dx20 is (in Figure 26, distance D x1, Dx2 ..., Dx20 is the distance on the same straight line, but distance D x1, Dx2 ..., not need must be distance on the same straight line to Dx20).In the toner supplying roller 550 of present embodiment, this mean distance Dxave is about 40～50 μ m.
On the other hand, there is shown among the end face 4512a of a plurality of protuberances 4512 one on the right side of Figure 26.In the developer roll 510 of present embodiment, the end face 4512a of protuberance 4512 axially on breadth extreme (this breadth extreme is represented with mark Wx in Figure 26) be about 80 μ m.
Like this, in the developing apparatus of present embodiment,, therefore has following advantage because described mean distance Dxave is littler than described breadth extreme Wx.Promptly, in this developing apparatus, even the zone of the wall between the opening of the hole 550c of toner supplying roller 550 550d is connected with the end face 4512a of protuberance 4512, also can avoid toner supplying roller 550 axially on, described end face 512a is covered (in the right figure of Figure 26, representing not by the example of the part of the end face 4512a of wall zone 550d covering with oblique line) fully by described wall zone 550d.Therefore, when toner supplying roller 550 is left at the position of toner supplying roller 550 contact developer rolls 510, and the toner that is carried suitably carries toner when being limited scraper plate 560 chargings and being limited bed thickness on the end face 4512a of protuberance 4512.
So, even toner is carried on the part of end face 4512a of protuberance 4512, also can be owing to limiting bed thickness by limiting scraper 560, and the toner of heaping on the end face 4512a that is carried on protuberance 4512 is evenly opened on end face 4512.In other words, heap the toner be carried on the end face 4512a be diffused into end face 4512a on a large scale in.Therefore, when sub-image is developed, can suitably avoid making density unevenness owing to producing not to be developed to the position of toner picture or to produce the lower position of density.
Below with reference to Figure 27, the end face 4512a of the described protuberance 4512 on the circumferencial direction of developer roll 510 and toner supplying roller 550 and the relation of described wall zone 550d are investigated.Figure 27 is the synoptic diagram of validity that is used to illustrate the developing apparatus of the 5th embodiment.
In the left figure of Figure 27, the same with Figure 26, show the synoptic diagram that amplifies has been carried out in the cross section of the 550a of roller portion of toner supplying roller 550.Here, distance on the circumferencial direction of this toner supplying roller 550 between the opening of the hole 550c of toner supplying roller 550 for example is the distance of representing with mark Dy1, Dy2, Dy3 among Figure 27, in addition, the mean distance Dyave of this distance be a plurality of (for example 20) described distance D y1, Dy2 ..., the mean value of Dy20.In the toner supplying roller 550 of present embodiment, this mean distance Dyave is identical with aforesaid mean distance Dxave, is about 40～50 μ m.
On the other hand, the same with Figure 26 in the right figure of Figure 27, show among the end face 4512a of a plurality of protuberances 4512.In the developer roll 510 of present embodiment, the breadth extreme on the circumferencial direction of the end face 4512a of protuberance 4512 (this breadth extreme is represented with mark Wy in Figure 27) is the same with aforesaid breadth extreme Wx, is about 80 μ m.
So, even for circumferencial direction, if satisfying relation on the circumferencial direction of toner supplying roller 550, described mean distance Dyave and described breadth extreme Wy make it possible to avoid described wall zone 550d to cover described end face 4512a fully, even then the zone of the wall between the opening of the hole 550c of toner supplying roller 550 550d is connected with the end face 4512a of protuberance 4512, also can produce described effect, that is: when sub-image is developed, can suitably avoid owing to produce the position that is not developed to the toner picture, or produce the lower position of density and make density unevenness.
Here, this relation is investigated, for circumferencial direction, with described axially some is different.Promptly, in the present embodiment, as previously mentioned, between toner supplying roller 550 and developer roll 510, difference is set, 1.5 times of the surperficial translational speed of the developer roll 510 when the surperficial translational speed of the toner supplying roller 550 during toner supplying roller 550 rotation approximately is developer roll 510 rotations.In this case, for example the surface of toner supplying roller 550 only advance described mean distance Dyave during, the surface of the developer roll 510 following distance of only advancing, that is: this mean distance Dyave is divided by the resulting distance of the ratio R of surperficial translational speed with the surperficial translational speed of developer roll 510 of toner supplying roller 550 (promptly 1.5).Therefore, for circumferencial direction, when mean distance Dyave is removed resulting value than maximal value Wy hour on the circumferencial direction of the end face 4512a of the protuberance 4512 of developer roll 510 by the ratio R of the surperficial translational speed of toner supplying roller 550 and the surperficial translational speed of developer roll 510 (promptly 1.5), can produce described effect.
In the present embodiment, mean distance Dyave is about 26～33 μ m divided by the resulting value of the ratio R of surperficial translational speed with the surperficial translational speed of developer roll 510 of toner supplying roller 550 (promptly 1.5), and this value is littler than described breadth extreme Wy (about 80 μ m).Therefore, even the zone of the wall between the opening of the hole 550c of toner supplying roller 550 550d is connected with the end face 4512a of protuberance 4512, also can avoid described end face 4512a to be covered (among the right figure at Figure 27, representing not by the example of the part of the end face 4512a of wall zone 550d covering) fully by described wall zone 550d on the circumferencial direction of toner supplying roller 550 with oblique line.Therefore, when sub-image is developed, can suitably avoid making density unevenness owing to producing not to be developed to the position of toner picture or to produce the lower position of density.
In addition, as shown in figure 28, the developing apparatus of present embodiment is by following formation, promptly, when the wall zone of the protuberance 4512 of developer roll 510 and toner supplying roller 550 550d contacts, at least the part of the end face 4512a of protuberance 4512 exceeds the wall zone 550d (in Figure 28, representing the part that exceeds wall zone 550d of end face 4512a with oblique line) that is surrounded by a plurality of hole 550c.
Therefore, in this developing apparatus,, also can more suitably avoid described end face 4512a to be covered fully by described wall zone 550d even the zone of the wall between the opening of the hole 550c of toner supplying roller 550 550d is connected with the end face 4512a of protuberance 4512.Thereby when sub-image is developed, can more suitably avoid making density unevenness owing to producing not to be developed to the position of toner picture or to produce the lower position of density.
Figure 28 is the synoptic diagram of validity that is used to illustrate the developing apparatus of the 5th embodiment, and it shows the contacted form of wall zone 550d of the protuberance 4512 and the toner supplying roller 550 of developer roll 510.
In addition, as mentioned above, the lip-deep toner-particle that is carried on developer roll 510 limits its bed thickness by the plane that limiting scraper 560 is had.Therefore, the lip-deep toner-particle that is carried on developer roll 510 can not be limited scraper plate 560 and sweep fully, can will only supply with the toner-particle of a part of the end face of protuberance 4512 by limiting scraper 560 and evenly spread out on the end face of protuberance 4512.
(structures of image formation system etc.)
Below, with reference to accompanying drawing the embodiment as the image formation system of an example of embodiment of the present invention is described.
Figure 29 is the key diagram that the surface structure of image formation system is shown.Image formation system 700 comprises: computing machine 702, display device 704, printer 706, input media 708 and reading device 710.Computing machine 702 is accommodated in the basket of mini tower (MiniTower) type in the present embodiment, but is not limited thereto.Display device 704 general use CRT (Cathode Ray Tube, cathode-ray tube (CRT)), plasma display or LCD etc., but be not limited thereto.Printer 706 uses the printer of above-mentioned explanation.Input media 708 uses keyboard 708A and mouse 708B in the present embodiment, but is not limited thereto.Reading device uses flexible disc drive 710A and CD-ROM drive unit 710B in the present embodiment, but is not limited thereto.For example, also can be that MO (Magneto Optical, magneto-optic disk) disk drive and DVD (Digital Versatile Disk, multifunctional digital code CD) wait other devices.
Figure 30 is the structured flowchart of expression image formation system shown in Figure 29.Hold in the basket of computing machine 702 and also be provided with: external memory storages such as internal storages such as RAM 802 and harddisk driving unit 804.
In addition, in the above description, printer 706 is connected with computing machine 702, display device 704, input media 708 and reading device 710 and composing images forms the example of system and is illustrated, but is not limited thereto.For example, image formation system both can be made of computing machine 702 and printer 706, also can not possess some in display device 704, input media 708 and the reading device 710.
In addition, for example printer 706 can have the function separately of computing machine 702, display device 704, input media 708 and reading device 710 or the part in the structure.As an example, printer 706 can have: the image processing part that carries out Flame Image Process; Carry out the display part of various demonstrations; And the recording medium installation portion, be used to install the recording medium that has write down shot image data such as digital camera.
As mentioned above the image formation system of Shi Xianing as entire system than system was superior in the past.

Claims (6)

1. a developing apparatus has toner-particle bearing roller, and this toner-particle bearing roller carries toner-particle in its surface, and develops to being carried on as the sub-image on the supporting body by this toner-particle,
Described toner-particle bearing roller has and is arranged on described lip-deep protuberance, and this protuberance possesses the end face with flat, and the width of this end face is more than the volume average particle size of described toner-particle, wherein,
Described protuberance has the side that links to each other with described end face,
Connecting portion in described end face and described side is formed with fillet.
2. developing apparatus as claimed in claim 1, also has layer-thickness restriction member, this layer-thickness restriction member contacts with this toner-particle bearing roller in the gamut of the other end from an axial end of described toner-particle bearing roller, be used to limit the bed thickness that is carried on the toner-particle on this toner-particle bearing roller
Described layer-thickness restriction member contacts with described toner-particle bearing roller by plane that this layer-thickness restriction member has and limits described bed thickness.
3. developing apparatus as claimed in claim 1 or 2, wherein, the radius-of-curvature of described fillet is volume average particle size over half of described toner-particle.
4. developing apparatus as claimed in claim 1 or 2, wherein,
Be provided with spiral helicine slot part on described surface, this slot part tilts with respect to the axial and circumferencial direction of described toner-particle bearing roller, and in described axial equal intervals,
Described slot part forms two types by the angle difference that makes described inclination,
Described protuberance is surrounded by described two types described slot part,
The degree of depth of described slot part is below the twice of volume average particle size of described toner-particle.
5. developing apparatus as claimed in claim 1 or 2, wherein,
Be provided with spiral helicine slot part on described surface, this slot part tilts with respect to the axial and circumferencial direction of described toner-particle bearing roller, and in described axial equal intervals,
Described slot part forms two types by the angle difference that makes described inclination,
Described protuberance is surrounded by described two types described slot part,
Described sub-image has and is formed on the point-like sub-image that is divided in the cancellate zone,
Described can be formed on as supporting body described axially on the grid of polytype spacing,
The long spacing of described slot part in the polytype spacing of the described described grid of gap ratio on axially is little.
6. an image processing system has developing apparatus, and this developing apparatus possesses:
Be used to carry the picture supporting body of sub-image; And
Toner-particle bearing roller, this toner-particle bearing roller carries toner-particle in its surface, and describedly develop to being carried on as the sub-image on the supporting body by this toner-particle, described toner-particle bearing roller has and is arranged on described lip-deep protuberance, this protuberance possesses the end face with flat, and the width of this end face is more than the volume average particle size of described toner-particle, wherein
Described protuberance has the side that links to each other with described end face,
Connecting portion in described end face and described side is formed with fillet.
CNB2006101379701A 2005-11-02 2006-11-01 Toner-particle bearing roller, developing device, and image forming apparatus Expired - Fee Related CN100517111C (en)

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JP2005319930A JP4821271B2 (en) 2005-11-02 2005-11-02 Developing device, toner particle carrying roller, image forming apparatus, image forming system, and toner particle carrying roller manufacturing method
JP2005319931 2005-11-02
JP2005319930 2005-11-02
JP2005327781 2005-11-11
JP2005340271 2005-11-25
JP2006001479 2006-01-06

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CN101408745B (en) 2011-04-13

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