CN100595691C - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
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- CN100595691C CN100595691C CN200710199544A CN200710199544A CN100595691C CN 100595691 C CN100595691 C CN 100595691C CN 200710199544 A CN200710199544 A CN 200710199544A CN 200710199544 A CN200710199544 A CN 200710199544A CN 100595691 C CN100595691 C CN 100595691C
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Abstract
The invention provides an image forming apparatus, in which a visual image on a photosensitive drum is developed with columnar toner, and the developed toner image is transferred from the photosensitive drum to an intermediate transfer belt, a moving speed of the photosensitive drum and a moving speed of the intermediate transfer belt are different at a contact position (transfer nip section) where the photosensitive drum and the intermediate transfer belt are in contact. With this arrangement, toner scattering, nonuniform image etc. can be reduced in the image forming apparatus, in which thedevelopment is carried out with columnar toner.
Description
Technical field
The present invention relates to a kind of image processing system of electrofax mode, specially refer to a kind of image processing system that utilizes column (cylindric) toner to carry out development treatment.
Background technology
The scheme that has the image processing system that utilizes the column toner in the prior art.The column toner has following characteristic: (i) make easily the diameter unanimity, (ii) can realize higher yield rate, (iii) when image forms, be easy to realize homogeneous thickness.And, by above-mentioned characteristic, compare with the situation of the spherical toner of existing use, have the following advantages: (a) image concentration stabilization, controlled raising, the raising of (c) resolution, (d) of (b) deep or light (gray scale) prevent to pollute and flying dust (flying spot), (e) during transfer printing prevent that the toner particle from forming plated film etc. on developer roll, photoreceptor.
For example, the technology of making column toner particle by following steps is disclosed in the patent documentation 1 (Japanese publication communique spy opens 2006-106236 (on April 20th, 2006 is open)): the fiberization step, the toner raw material of molten condition is extruded from nozzle, formed fibrous; The particlized step is cut off and is formed fibrous toner raw material, manufactures columnar-shaped particle; Add and to chamfer step, carry out applying mechanical force, the interpolation of above-mentioned columnar-shaped particle surface combination adjuvant being handled to the columnar-shaped particle that in the particlized step, obtains under the state that has mixed adjuvant, and make the bight of above-mentioned columnar-shaped particle become the round processing of chamfering.
And, patent documentation 2 (Japanese publication communique spy opens 2000-122442 (on April 28th, 2000 is open)) discloses following technology: in the image processing system of existing electrofax mode, in order to make the toner particle be easy to break away from from the parts of a side of transfer printing toner image, the peripheral speed of the parts of a side of transfer printing toner image and be transferred the peripheral speed of parts of a side of toner image or the translational speed of recording medium set out small poor.
And, patent documentation 3 (Japanese publication communique spy opens 2003-149955 (on May 21st, 2003 open)) discloses following technology: forming the electrostatic latent image pattern that extends on sub scanning direction with the ratio of A/B with respect to original picture pattern in the surface of the electrostatic latent image carrier of (B/A of the Vpro of device processing speed doubly) speed Vopc rotation fast with ratio device processing speed Vpro, make the electrostatic latent image pattern of elongation visual by developing cell, this visual image is transferred to the intermediate transfer body that rotates with device processing speed Vpro, thereby on the intermediate transfer body, form the picture pattern of original required size, improve the resolution of sub scanning direction.
And, patent documentation 4 (Japanese publication communique spy opens flat 4-86878 (on March 19th, 1992 open)) discloses following technology: have the image-carrier that forms toner image, and with image-carrier on the developer image that forms in the pen recorder that is transferred the transfer printing unit on the parts, by applying the interchange transfer bias of the frequency that meets the following conditions, prevent that toner from condensing in transfer nip, can not have the good printing that row comes off, literal comes off:
Fr≤4000, and (Fr * d)/V 〉=20Fr (Hz)
(wherein, Fr (Hz) is the frequency of AC bias, and d (mm) is the clamping width between transfer printing unit and the image-carrier, and V (mm/sec) is the translational speed of image-carrier)
But, the image processing system that utilizes the column toner carries out image at the major diameter direction state towards all directions such as main scanning direction, sub scanning directions at random of toner and forms, so produces the gap between the toner and cause producing problems such as density unevenness, toner disperse.
Fig. 7 is shown schematically in the existing image processing system that utilizes the column toner, and the toner image of developing on the photosensitive drums 101 is transferred to the key diagram of the form on the intermediate transfer belt 102.As shown in the drawing, intermediate transfer belt 102 is extruded to photosensitive drums 101 by transfer roll 103, forms transfer nip, and in this transfer nip, toner image is transferred to intermediate transfer belt 102 from photosensitive drums 101.In addition, in the existing image processing system that utilizes the column toner, the translational speed of photosensitive drums 101 and intermediate transfer belt 102 is controlled to be constant speed on surface of contact each other.
As shown in the drawing, the toner image of developing on photosensitive drums 101 is inconsistent because of the long axis direction of each toner, so (between the toner that image works when forming) produces the gap between the toner in point, it is unstable that contact condition between the toner becomes, and produces therefore that toner before the photographic fixing disperses, the problems such as density unevenness after the photographic fixing.
In addition, though having the toner particle, the technology of patent documentation 2,3 is easy to the effect that breaks away from from the parts of a side of transfer printing toner image, but, can't obtain to utilize the above-mentioned advantage (a)～(e) that image processing system had of column toner not to utilizing the column toner to carry out any consideration.
And, though having, the technology of patent documentation 4 produces the effect that row comes off, literal comes off in the time of can preventing transfer printing, but, therefore can't obtain to utilize the above-mentioned advantage (a)～(e) that image processing system had of column toner not to utilizing the column toner to carry out any consideration.
Summary of the invention
The present invention produces in view of above problem, and its purpose is to prevent utilizing the column toner to carry out in the image processing system of development treatment, produces toner and disperses and the image inequality.
Image processing system of the present invention has: image-carrier in order to solve above-mentioned problem; The 1st driver element drives above-mentioned image-carrier and makes it rotation; Charged elements makes above-mentioned image-carrier charged; Latent image forms the unit, forms electrostatic latent image on above-mentioned charged image-carrier; Developing cell makes the electrostatic latent image that forms on the above-mentioned image-carrier develop by the column toner with the shape that extends to form to a direction, and forms toner image; The 2nd driver element makes transfer printing body move with respect to above-mentioned image-carrier; And transfer printing unit, above-mentioned image-carrier is contacted with above-mentioned transfer printing body, toner image on the above-mentioned image-carrier is transferred to above-mentioned transfer printing body, it is characterized in that, the translational speed of the above-mentioned image-carrier in the contact site of above-mentioned image-carrier and above-mentioned transfer printing body differs from one another with the translational speed of above-mentioned transfer printing body in the above-mentioned contact site.
According to above-mentioned structure, differ from one another by the translational speed of the image-carrier in the contact site that makes image-carrier and transfer printing body and the translational speed of transfer printing body, produce friction force between image-carrier and transfer printing body, the long axis direction (bearing of trend) that can make the column toner by this friction force is in main scanning direction (direction vertical with sense of rotation) unanimity.So, can enlarge the contact area between toner, improve the cohesiveness of toner, prevent that toner from dispersing.And, can prevent to produce between the toner gap, thereby can prevent to produce density unevenness in the toner image after the transfer printing.
And, by using the column toner, can make image concentration stabilization, improve deep or light (gray scale) controlled, improve resolution, prevent to pollute and the flying dust (flying spot) during transfer printing, prevent that the toner particle from forming plated film etc. on developer roll and photoreceptor.
In addition, the also recording medium of sheet of above-mentioned transfer printing body.Perhaps, above-mentioned transfer printing body also will be transferred to the intermediate transfer body of sheet-shaped recording medium from the toner image of above-mentioned image-carrier transfer printing.And above-mentioned sheet-shaped recording medium for example is the recording medium of film like such as paper, transparent membrane.
Other purposes of the present invention, feature and advantage can be able to clearly by following record.And, advantage of the present invention by with reference to the following explanation of accompanying drawing can be able to clearly.
Description of drawings
Fig. 1 is the key diagram of the rotation control mechanism of the expression photosensitive drums that image processing system had that relates to of an embodiment of the invention and intermediate transfer belt driven roller.
Fig. 2 is the sectional view of the summary structure of the image processing system that relates to of expression an embodiment of the invention.
Fig. 3 is the sectional view of an example of the expression photoreceptor drive motor that image processing system had that relates to of an embodiment of the invention and intermediate transfer belt drive motor.
Fig. 4 is shown schematically in the image processing system that an embodiment of the invention relate to, and toner image is transferred to the key diagram of the form of intermediate transfer belt when forming monochrome image from photosensitive drums.
Fig. 5 is shown schematically in the image processing system that an embodiment of the invention relate to, and toner image is transferred to the key diagram of the form of intermediate transfer belt when forming multicolor image from photosensitive drums.
Fig. 6 is the sectional view of the variation of the image processing system that relates to of expression an embodiment of the invention.
Fig. 7 is shown schematically in the existing image processing system that utilizes the column toner, and toner image is transferred to the key diagram of the form on the intermediate transfer belt from photosensitive drums.
Fig. 8 is the key diagram of the summary structure of the image processing system that relates to of expression other embodiments of the present invention.
Embodiment
An embodiment of the invention below are described.
Fig. 2 is the sectional view of the summary structure of the image processing system 100 that relates to of expression present embodiment.In addition, image processing system 100 is the image processing systems that form the colored series system of polychrome or monochrome image according to the view data that transmits from the outside to recording paper (sheet).
As shown in the drawing, image processing system 100 is made of following: exposing unit 1, developer 2a～2d, photosensitive drums 3a～3d, charged device 5a～5d, cleaning unit 4a～4d, intermediate transfer belt 7, intermediate transfer belt unit 8, fixation unit 12, paper transport path S, sheet feed stacker 10, row's paper disc 15 etc.In addition, the action of these parts of having of image processing system 100 is controlled by not shown CPU (control part).
The view data of handling in image processing system 100 is corresponding to the versicolor coloured image that uses black (K), blue or green (C), pinkish red (M), yellow (Y).Therefore as shown in Figure 2, developer 2a, 2b, 2c, 2d, photosensitive drums 3a, 3b, 3c, 3d, charged device 5a, 5b, 5c, 5d, cleaning unit 4a, 4b, 4c, 4d are arranged to formation and four kinds of corresponding latent images of (K, C, M, Y) of all kinds respectively.And, by above-mentioned parts, four image station Sa, Sb, Sc, Sd that formation and (K, C, M, Y) of all kinds are corresponding.In addition, " a " and black correspondence in each mark, " b " and blue or green correspondence, " c " and magenta are corresponding, and " d " and Huang are corresponding.And each image station Sa～Sd has identical construction in fact.
Charged device 5a～5d is the average charged charged elements to the regulation current potential in surface that is used to make photosensitive drums 3a～3d.The structure of charged device 5a～5d is not particularly limited, and for example can use the charged device of contact-types such as charged device, roller strap electricity or brush electricity of the non-contact type of corona discharge mode etc.
Exposing unit 1 has following function: make the view data exposure according to input by the charged photosensitive drums 3a～3d of charged device 5a～5d, thereby form on the surface of each photosensitive drums 3a～3d and the electrostatic latent image of view data correspondence.Exposing unit 1 uses the laser scan unit (LSU) with laser irradiating part 1a and catoptron 1b etc.In addition, exposing unit 1 also can use the light-emitting device array shape is arranged, for example EL, LED write first-class.
In the present embodiment, the toner as this development treatment is used adopts cylindric toner (column toner, non-spherical toner).And in this manual, the column toner is the toner that points to the shape of a direction extension.And cylindric toner is meant in the column toner, is the center with the axle (major axis) that extends to an above-mentioned direction, and the side is roughly axisymmetric shape.But also need not to be strict rotational symmetry, as long as the shape in the cross section vertical with axle can be considered circular in fact.So long as circular or oval getting final product.And two bottom surfaces that are positioned at above-mentioned direction both sides also needn't be necessarily vertical with axle.And above-mentioned two bottom surfaces are plane (for example also can have concavo-convex) not necessarily.
And in the present embodiment, as above-mentioned cylindric toner, the length L of using long axis direction and ratio L/D with the vertical diameter of a circle D that the cross section became of major axis are the cylindric toner more than 1, below 3.That is the ratio L/R of radius (radius of the ball identical with the cylindric toner volume) R when, the length L of use long axis direction converts with ball is the cylindric toner more than 1.75, below 3.63.
Intermediate transfer belt unit 8 is overlapping successively being transferred on the intermediate transfer belt 7 of toner image of all kinds of the last formation of photosensitive drums 3a～3d, thereby forms colored toner image (polychrome toner image) on this intermediate transfer belt 7.And, by the rotation of intermediate transfer belt 7, the toner image that forms on the intermediate transfer belt 7 is sent to the contact position of recording paper and intermediate transfer belt 7, and the transfer roll 11 by being configured in this contact position, be transferred on the recording paper.
Intermediate transfer belt unit 8 has as shown in Figure 2: intermediate transfer rollers (transfer member) 6a～6d, intermediate transfer belt 7, intermediate transfer belt driven roller 71, intermediate transfer belt driven voller 72, intermediate transfer belt strainer 73 and intermediate transfer belt cleaning unit 9.These intermediate transfer rollers 6a～6d, intermediate transfer belt driven roller 71, intermediate transfer belt driven voller 72, intermediate transfer belt strainer 73 etc. are erected intermediate transfer belt 7, drive intermediate transfer belt 7 and rotate to the arrow B direction.In addition, the method for controlling rotation of intermediate transfer belt 7 is as described below.
And intermediate transfer belt 7 can be toward or away from photosensitive drums 3b～3d.Promptly, in intermediate transfer belt unit 8, by not shown driver element, the relative position of intermediate transfer rollers 6b～6d, intermediate transfer belt driven roller 71, intermediate transfer belt driven voller 72, intermediate transfer belt strainer 73 etc. is moved, thereby can make intermediate transfer belt 7 be toward or away from photosensitive drums 3b～3d.So, when single color printing, only black (K) photosensitive drums 3a contacts with intermediate transfer belt 7.
By with the intermediate transfer rollers 6a～6d of the interior side contacts of intermediate transfer belt 7, toner image is transferred to intermediate transfer belt 7 from photosensitive drums 3a～3d.Intermediate transfer belt 6a～6d rotatably supports by the intermediate transfer rollers installation portion (not shown) of intermediate transfer belt strainer 73, applies the transfer bias (with (+) high pressure of charged polarity (-) opposite polarity of toner) that is used for the toner image on photosensitive drums 3a～3d is transferred to the high pressure on the intermediate transfer belt 7.In addition, intermediate transfer rollers 6a～6d is in moving direction downstream one side of comparing with the point of contact of the tangent line of the photosensitive drums of the moving direction that is parallel to intermediate transfer belt 7 and photosensitive drums by intermediate transfer belt 7, by intermediate transfer belt 7 and photosensitive drums 3a～3d butt configuration.
So, the electrostatic latent image (toner image) that develops corresponding to each form and aspect on each photosensitive drums 3a～3d is transferred (lamination) on intermediate transfer belt 7, become and be input to the image of the image information correspondence of device.Like this, the image of transfer printing (lamination) is sent to the contact position of recording paper and intermediate transfer belt 7 by the rotation of intermediate transfer belt 7, and is transferred on the recording paper by the transfer roll 11 that is configured in this contact position.
At this moment, intermediate transfer belt 7 and transfer roll 11 be with clamping (the clamping width of the crimp force of regulation and the regulation) crimping of regulation, and apply the voltage (with (+) high pressure of charged polarity (-) opposite polarity of toner) that is used for toner is transferred to recording paper on transfer roll 11.In addition, transfer roll 11 is in order to obtain above-mentioned clamping all the time, preferably with hard material (metal etc.) form in transfer roll 11 or the intermediate transfer belt driven roller 71 any one, another forms by soft materials such as resilient roller (for example elastic caoutchouc roller or foamed resin roller etc.).
And, as mentioned above, in next step, can cause the toner colour mixture because of being attached to the toner of intermediate transfer belt 7 or not being transferred to the toner that remains in intermediate transfer belt 7 on the recording paper, therefore be removed/reclaim by intermediate transfer belt cleaning unit 9 by transfer roll 11 with contacting of photosensitive drums 3a～3d.
In the intermediate transfer belt cleaning unit 9, the parts (cleaning member) as contacting with intermediate transfer belt 7 for example have cleaning doctor.In this case, intermediate transfer belt 7 with the cleaning doctor position contacting on, support from the inboard by intermediate transfer belt driven voller 72.
And, be provided with the paper transport path S of approximate vertical shape in the image processing system 100, be used for the recording paper of sheet feed stacker 10 via transfer roll (transfer printing portion) 11, fixation unit 12 and the row's of being sent to paper disc 15.Further, near the paper transport path S till from sheet feed stacker 10 and manual feed tray 20 to row's paper disc 15, dispose transfer roller 21～28 that pick- up roller 16,17, registration roller 14, transfer roll 11, fixation unit 12, transfer sheet open etc.
The paper that pick-up roller 16 is arranged on sheet feed stacker 10 takes out side end, and the paper that pick-up roller 17 is arranged on manual feed tray 20 takes out side end.Pick-up roller 16 is the incoming call rollers that recording paper are provided to page by page paper transport path S from sheet feed stacker 10.Pick-up roller 17 is the incoming call rollers that recording paper are provided to page by page paper transport path S from manual feed tray 20.
And, warm-up mill 12a is by based on the control from the signal of not shown Temperature Detector, be set at the fixing temperature of regulation, in the lump recording paper is carried out hot pressing with backer roll 12b, thereby make toner image (polychrome toner image or the monochromatic toner image) fusion that is transferred to recording paper, mixing, and crimping, hot photographic fixing is to recording paper.
The drive controlling method of photoreceptor drive motor 31a～31d and intermediate transfer belt drive motor 32 then is described.Fig. 1 is the key diagram that is used to that photosensitive drums 3a～3d is described, reaches the rotation control mechanism of intermediate transfer belt driven roller 71.As shown in the drawing, photosensitive drums 3a～3d, intermediate transfer belt driven roller 71 are connected with drive motor (photoreceptor drive motor 31a～31d, intermediate transfer belt drive motor 32) independently respectively, the Spin Control portion 33 that CPU (control part) is had provides control signal to these drive motor, thereby rotation drives independently of one another.
The structure of these drive motor is not particularly limited so long as can set the motor of rotational speed and get final product, and for example can use stepper motor 40 as shown in Figure 3.Stepper motor 40 shown in this figure has: fixing stator (electromagnet) 41, turning axle (axle) 42, be installed in the rotor (magnet) 43 on the turning axle 42.So, make the pairing electric current of pulse duration frequency signal (control signal) that is input to stepper motor 40 from Spin Control portion 33 flow into the coil that is wrapped on the stator 41, produce magnetic force,, and make its rotation by this magnetic attraction rotor 43.Therefore, the interval of excitation of each stator is switched and low speedization in the interval of the excitation of the rotational speed of stepper motor 40 by shorten switching each stator and rapid by lengthening.That is, the frequency by adjusting above-mentioned pulse duration frequency signal or the rotational speed of dutycycle may command motor.
Fig. 4 be schematically show shown in the present embodiment, control each drive motor rotational speed so that 0.99≤V2/V1＜1 o'clock, when forming the monochrome image of black (at this moment, photosensitive drums 3b～3d leaves intermediate transfer belt 7, photosensitive drums 3a and intermediate transfer belt 7 butts), toner image is transferred to the key diagram of the form of intermediate transfer belt 7 from photosensitive drums 3a.
Velocity contrast between the peripheral speed of the peripheral speed of photosensitive drums 3a and intermediate transfer belt 7 is set, by the mechanicalness energy effect that friction force produced that produces between photosensitive drums 3a in the transfer nip and the intermediate transfer belt 7, as shown in Figure 4, can not produce toner disperses/at random/image deflects such as increase of retransferring, and the long axis direction of cylindric toner is towards Width (main scanning direction) unanimity of photosensitive drums 3a.
So, can enlarge the contact area between toner, thereby or prevent from or reduce toner to disperse.And, can eliminate (or reducing) and be used for gap between the toner that image forms, and the anti-effect of dispersing by above-mentioned toner, can prevent that the image after the photographic fixing from producing density unevenness.
Fig. 5 be schematically show shown in the present embodiment, control each drive motor rotational speed so that 0.99≤V2/V1＜1 o'clock, when forming multicolor image (at this moment, photosensitive drums 3b～3d and intermediate transfer belt 7 butts), toner image is transferred to the key diagram of the form of intermediate transfer belt 7 from photosensitive drums 3a～3c (the 2nd kind color after photosensitive drums).
As shown in the drawing, when toner image is overlapped on intermediate transfer belt 7, can enlarge the contact area between toner, improve the cohesiveness of toner, can prevent that generation from resending (toner of transfer printing body one side moves to the phenomenon of photoreceptor one side) when the effect of therefore dispersing and reducing the density unevenness effect, coincidence the 2nd kind of color after except above-mentioned toner is anti-.So, can carry out the coincidence of polychrome toner image well.
As mentioned above, the image processing system that present embodiment relates to is to utilize cylindric toner that the visual image on the photosensitive drums is developed, and the toner image of developing is transferred to the structure of intermediate transfer belt from photosensitive drums, in the contact site (transfer nip) of photosensitive drums and intermediate transfer belt, between the translational speed of photosensitive drums and the translational speed of intermediate transfer belt velocity contrast is set.So, can make the long axis direction of cylindric toner consistent on main scanning direction by the friction force that produces between photosensitive drums and the intermediate transfer belt.Therefore, can enlarge the contact area between toner, prevent or reduce dispersing of toner.And, can prevent or reduce in the image after the photographic fixing producing density unevenness.
In addition, in the present embodiment, behind the intermediate transfer belt 7 that toner image temporarily is transferred to as transfer printing body, this toner image is sent to the transfer position of recording paper, and the structure that is transferred to recording paper is illustrated, but is not limited thereto.For example also the toner image on photosensitive drums 3a～3d directly is transferred to structure as the recording paper of transfer printing body.
Fig. 6 is the key diagram of structure that expression directly is transferred to toner image from photosensitive drums the image processing system 100b of recording paper P.In addition for convenience of explanation, use identical mark to having, and omit its explanation with the parts of image processing system 100 identical functions.
Sheet-transport belt 57 Electrostatic Absorption and transfer sheet are opened P, and the toner image of all kinds of the last formation of each photosensitive drums 3a～3d is overlapping successively and be transferred on the recording paper P.And sheet-transport belt 57 can be toward or away from photosensitive drums 3b～3d.Promptly, by not shown driver element the relative position of transfer roll 56b～56d, sheet-transport belt driven roller 51, sheet-transport belt driven voller 52, sheet-transport belt strainer 53 etc. is moved, thereby can make sheet-transport belt 57 be toward or away from photosensitive drums 3b～3d.So, during single color printing, only the photosensitive drums 3a of black (K) contacts with sheet-transport belt 57 (or recording paper P).
Toner image is transferred to the toner image of recording paper P by transfer roll 56a～56d from photosensitive drums 3a～3d with the interior side contacts of sheet-transport belt 57.Transfer roll 56a～56d rotatably supports by the intermediate transfer rollers installation portion (not shown) of sheet-transport belt strainer 53, and the toner image on photosensitive drums 3a～3d applies the high pressure transfer bias that is used to be transferred to recording paper P (with (+) high pressure of charged polarity (-) opposite polarity of toner).In addition, transfer roll 56a～56d is configured to: be parallel to transfer nip in the tangent line of photosensitive drums of moving direction (moving direction of recording paper P) direction of sheet-transport belt 57 and the point of contact of photosensitive drums compare moving direction downstream one side by sheet-transport belt 57, by sheet-transport belt 57 and photosensitive drums 3a～3d butt.
So, toner image on photosensitive drums 3a～3d directly is transferred under the structure of recording paper P, velocity contrast between the peripheral speed by photosensitive drums 3a～3d is set and the translational speed of transfer printing body (recording paper P), same substantially effect in the time of can obtaining between the peripheral speed of the peripheral speed of the photosensitive drums 3a with intermediate transfer belt 7～3d and transfer printing body (intermediate transfer belt 7), velocity contrast to be set.
And, in the present embodiment, set the peripheral speed of transfer printing body (intermediate transfer belt 7 or sheet-transport belt 7b) for peripheral speed, but be not limited thereto, also can make the peripheral speed of the peripheral speed of photosensitive drums 3a～3d greater than transfer printing body greater than photosensitive drums 3a～3d.In this case, can make the long axis direction unanimity of the column toner that is transferred to transfer printing body, obtain to reduce density unevenness and prevent the effect that stop disperses.And when setting the peripheral speed of photosensitive drums 3a～3d greater than the peripheral speed of transfer printing body, generation is transferred to the toner on transfer printing body surface by the phenomenon of photosensitive drums 3a～3d surface wiping, therefore preferably can cause transfer printing bad, the peripheral speed of transfer printing body be set greater than the peripheral speed of photosensitive drums 3a～3d.In addition, when producing transfer printing that the wiping phenomenon causes when bad, be easy to produce the hollow phenomenon that lacks part such as fine rule, word segment, and by the peripheral speed of transfer printing body being set, can prevent that transfer printing such as hollow phenomenon is bad greater than the peripheral speed of photosensitive drums 3a～3d.
And, in the present embodiment, intermediate transfer rollers 6a～6d be parallel to transfer nip in the tangent line of moving direction photosensitive drums of intermediate transfer belt 7 and the point of contact of photosensitive drums compare moving direction downstream one side by intermediate transfer belt 7, by intermediate transfer belt 7 and photosensitive drums 3a～3d butt configuration.Perhaps, transfer roll 56a～56d is in moving direction downstream one side of comparing with the point of contact of the tangent line of the photosensitive drums of the moving direction that is parallel to sheet-transport belt 57 (moving direction of recording paper P) direction and photosensitive drums by sheet-transport belt 57, by sheet-transport belt 57 and photosensitive drums 3a～3d butt configuration.
So, transfer printing clamping (the butt width of transfer printing body (intermediate transfer belt 7 or recording paper P) and photosensitive drums 3a～3d) can be fully guaranteed, therefore transfer efficiency can be improved.And, can suppress to protrude into the phenomenon that the preceding toner image of transfer nip is dispersed.
And the ratio L/R of the radius R when in the present embodiment, using long axis direction length L and ball to convert is the cylindric toner more than 1.75, below 3.63.The cylindric toner of above-mentioned condition is satisfied in use, and make the peripheral speed (translational speed in the transfer nip) of photosensitive drums 3a～3d and the peripheral speed (translational speed in the transfer nip) of transfer printing body (intermediate transfer belt 7 or recording paper P) have velocity contrast, thereby can make the long axis direction of cylindric toner consistent accurately on main scanning direction, the effect that therefore can obtain to prevent the effect that toner disperses and reduce density unevenness.In addition, consistent accurately on main scanning direction for the long axis direction that further makes cylindric toner, preferably use the cylindric toner of 2.19＜L/R≤3.63, the i.e. cylindric toner of 1.4＜L/D≤3.In addition, when to use square with the axis cross sectional shape be not just round column toner, be column toner more than 1.75, below 3.63 by using L/R, can prevent suitably that toner from dispersing and the generation of density unevenness.And, be the following column toners in 2.19＜L/R≤3.63 by using L/R, can prevent suitably that toner from dispersing and the generation of density unevenness.And for the long axis direction unanimity of the toner that makes transfer printing more effectively, preferred square with the axis cross section is for circle or approach circle.
(embodiment 2)
Other embodiments of the present invention below are described.In addition for convenience of explanation, be marked with the mark identical to having, and omit its explanation with embodiment 1 with the parts of embodiment 1 identical function.
Fig. 8 is the key diagram of the structure of the image processing system 100c that relates to of expression present embodiment.As shown in the drawing, the image processing system 100 (with reference to Fig. 2) of image processing system 100c in embodiment 1, also have transfer printing control part 61, transfer voltage generating unit 62a～62d, direct supply 63, AC power 64.
Transfer voltage generating unit 62a～62d generates the transfer voltage (transfer bias) that is applied between intermediate transfer rollers (transfer member) 6a～6d and the photosensitive drums 3a～3d respectively.
Transfer printing control part 61 is by the action of control transfer voltage generating unit 62a～62b, and the transfer voltage that will be applied between intermediate transfer rollers (transfer member) 6a～6d and the photosensitive drums 3a～3d is controlled to be required voltage respectively.
Particularly, transfer voltage generating unit 62a～62d is according to the control signal from transfer printing control part 61, the DC potential that will provide from direct supply 63 and suitably amplify and make it overlapping from the ac potential that AC power 64 provides, thereby generate the transfer printing current potential of required size, the transfer printing current potential that generates is provided to intermediate transfer rollers 6a～6d.So, the transfer voltage of DC voltage (Dc bias) and the overlapping required size that forms of alternating voltage (AC bias) is applied between intermediate transfer rollers 6a～6d and the photosensitive drums 3a～3d.
And in the present embodiment, making the size that is applied to the transfer voltage between intermediate transfer rollers 6a～6d and the photosensitive drums 3a～3d is more than the 2000V, below the 3300V.And, in order to generate the transfer printing current potential peak value of overlapping ac potential above to crest voltage (TV university current potential and minimum level poor) for 500V, below the 1200V, the frequency of this ac potential be 1000Hz above, below the 2500Hz.
Then explanation with the peak value of the size of transfer printing current potential, ac potential to the frequency of crest voltage, ac potential, reach the reason that the size of DC voltage is carried out above-mentioned setting.
Table 1 is when only applying Dc bias (DC voltage) between intermediate transfer rollers 6a～6d and photosensitive drums 3a～3d, the measurement result of the transfer efficiency of column toner.Table 1 represents that also processing speed (peripheral speed of the photosensitive drums 3a～3d under the transfer printing clamping (contact area of intermediate transfer belt 7 and photosensitive drums 3a～3d)) is 0.45mg/cm for 134mm/sec, toner adhesion amount from toner to photosensitive drums 3a～3d that adhere to
2The time the result.And, transfer efficiency is the photosensitive drums 3a～3d before transfer step adheres to toner when measuring real image respectively and forming toner adhesion amount, and finish to adhere to transfer belt 7 after the transfer step toner adhesion amount of toner, uses to the toner adhesion amount of photosensitive drums 3a～3d divided by the value that obtains to the toner adhesion amount of intermediate transfer belt 7.
(table 1)
| Apply voltage (V) | 1500 | 1800 | 2000 | 2200 | 2500 | 2800 | 3000 | 3300 | 3500 | 3800 | 4000 |
| Transfer efficiency (%) | 70 | 77 | 85 | 88 | 95 | 96 | 93 | 90 | 72 | 60 | 50 |
Transfer efficiency is preferably more than 80%, with the image quality that obtains not have problems in the actual use.Therefore, according to the experimental result shown in the table 1, the size that is applied to the transfer voltage between intermediate transfer rollers 6a～6d and the photosensitive drums 3a～3d is preferably more than the 2000V, below the 3300V.
In addition, as shown in table 1, when making transfer voltage greater than 3300V (more than the 3500V), transfer efficiency obviously descends.This be because, when transfer voltage is excessive, between the toner image on intermediate transfer belt 7 and the photosensitive drums 3a～3d, produce electric discharge phenomena, the electric field that is used for the actual effect of transfer printing is damaged.And, when transfer voltage during less than 2000V transfer efficiency to descend be because the electric field intensity in the transfer bias between intermediate transfer rollers 6a～6d and the photosensitive drums 3a～3d is insufficient.
Then, being applied to transfer voltage between intermediate transfer rollers 6a～6d and the photosensitive drums 3a～3d is under the condition more than the 2000V, below the 3300V, between the bias voltage peak value that changes ac potential when output (peak value is to crest voltage) Vp-p and frequency, the image quality in images that finally is formed on the recording paper investigates.Table 2 expression Dc bias is that 2500V, processing speed are that 173mm/sec, transfer printing clamping width are the relation of output (peak value arrives crest voltage) and AC bias frequency and picture quality between the bias voltage peak value of 5.0mm when above.And, the result that the following classification of image quality in images (repeatability of the repeatability of line image, point etc.) that forms on the recording paper is represented in numerical value 1～5 expression shown in the table.
5: do not have the image disorder
4: the image disorder (no problem in the practicality) that exists a small amount of naked eyes to confirm
3: the image disorder (no problem in the practicality) that exists more naked eyes to confirm
2: the image disorder that exists a small amount of naked eyes clearly to confirm
1: the image disorder that exists more naked eyes clearly to confirm
(table 2)
As shown in table 2, transfer printing AC bias frequency is 800Hz when above, and the raising effect of picture quality begins to occur.In addition, be that 800Hz is 23.12 times when being converted into vibration number to the toner in the transfer nip with frequency.Therefore, can think when the interior vibration number of transfer nip surpasses 23 times that the effect of improving of picture quality begins to occur.In addition, can obtain the vibration number of the toner in the transfer nip by computing clamping width (mm)/processing speed (mm/sec)/transfer printing AC bias frequency (Hz).
And, as shown in table 2, be output as between the bias voltage peak value more than the 500V, when 1200V is following, when transfer printing AC bias frequency is scope more than the 1000Hz, below the 2500Hz, be that the vibration number of toner is more than 28.9 times, below 72.25 times the time in the transfer nip, can access the practical picture quality that no problem degree.
And, as shown in table 2, be output as between the bias voltage peak value more than the 700V, when 1200V is following, when transfer printing AC bias frequency is scope more than the 1500Hz, below the 2200Hz, be that the vibration number of toner is more than 43.35 times, below 63.58 times the time in the transfer nip, can access the preferable image quality.
According to The above results, preferably with between the bias voltage peak value output be set at more than the 500V, below the 1200V, with transfer printing AC bias frequency setting is in the scope more than the 1000Hz, below the 2500Hz, promptly preferably is set at the vibration number of toner in the transfer nip more than 28.9 times, below 72.25 times.And, more preferably with between the bias voltage peak value output be set at more than the 700V, below the 1200V, with transfer printing AC bias frequency setting is in the scope more than the 1500Hz, below the 2200Hz, promptly more preferably is set at the vibration number of toner in the transfer nip more than 43.35 times, below 63.58 times.
In addition, because processing speed difference then friction force changes, therefore best transfer printing AC bias frequency may not be identical, even not simultaneously in processing speed, need only and be output as between the bias voltage peak value more than the 500V, below the 1200V, in the scope of transfer printing AC bias frequency more than 1000Hz, below the 2500Hz, then can make the vibration number of toner in the transfer nip be in preferred range, picture quality is improved.And, as long as be output as between the bias voltage peak value that 700V is above, 1200V following, in the scope of transfer printing AC bias frequency more than 1500Hz, below the 2200Hz, picture quality is further improved.
And, even not simultaneously in processing speed, by setting transfer printing AC bias frequency, 500V is above, 1200V is following, the vibration number of the interior toner of transfer nip is more than 28.9 times, below 72.25 times so that be output as between the bias voltage peak value, then can make picture quality bring up to the practical no problem degree that.And by setting transfer printing AC bias frequency, 700V is above, 1200V is following, the vibration number of the interior toner of transfer nip is more than 43.35 times, below 63.58 times, thereby picture quality is further improved so that be output as between the bias voltage peak value.
According to these experimental results, the size of transfer voltage is preferably more than the 2000V, below the 3300V as can be known.That is, when transfer voltage during less than 2000V, the electric field intensity in the transfer nip becomes insufficient, and transfer efficiency descends.And when transfer voltage surpasses 3300V, produce discharge in transfer nip, the electric field of the actual effect in space reduces, so transfer efficiency descends.Relative with it, when transfer voltage is a scope more than the 2000V, below the 3300V, then can not cause transfer efficiency to descend, can not produce the dot image disorder that toner disperses and causes, but transfer printing column toner.
And for the ac potential overlapping with DC voltage in order to generate transfer voltage, preferred peak is more than the 500V, below the 1200V and frequency is more than the 1000Hz, below the 2500Hz to crest voltage as can be known.By ac potential is in the above-mentioned scope, then the image that does not have problems in the practicality can formed on the recording paper.
In addition, be that ac potential 500V more than, 1200V below overlapping constantly with the size of the overlapping DC voltage of ac potential so long as making peak value to crest voltage in order to generate transfer voltage, transfer voltage is that the size that 2000V is above, 3300V is following gets final product.And the size of DC voltage is preferably in the scope that 2000V is above, 3000V is following.DC voltage is as in above-mentioned scope, then can not cause transfer efficiency to descend, can not produce the dot image disorder that toner disperses etc. and to cause, but transfer printing column toner.When DC voltage during less than 2000V, the space electric field in the transfer nip becomes insufficient, therefore the situation that exists transfer efficiency to descend.And, when DC voltage surpasses 3000V, in transfer nip, producing discharge, the electric field of the actual effect in space descends, therefore the situation that exists transfer efficiency to descend.
As mentioned above, the image processing system that present embodiment relates to, between the translational speed of the translational speed of the photosensitive drums that the contact site (transfer nip) of photosensitive drums and intermediate transfer belt is located and intermediate transfer belt, velocity contrast is set, and between photosensitive drums and intermediate transfer belt, applies the transfer voltage that makes alternating voltage overlap onto DC voltage.
So, between photosensitive drums and intermediate transfer belt, produce friction force, and the power of the electric field that produces by transfer voltage, can appropriateness reduce the toner cohesion in the transfer nip.Therefore, be easy to apply friction force, thereby be easy to make toner direction unanimity to each toner particle.Consequently, can not produce that toner disperses, point is disorderly, resend the image deflects that increase etc. causes, can make the long axis direction of cylindric toner consistent on main scanning direction more effectively.Therefore, can enlarge the contact area between toner, prevent more effectively or reduce dispersing of toner.And, can eliminate (or reducing) and be used for gap between toner that image forms, and the anti-effect of dispersing by above-mentioned toner, can prevent or reduce photographic fixing conscientiously after image produce density unevenness.
Particularly, in the higher equipment of processing speed, the structure of the image processing system that relates to by embodiment 1 only, the long axis direction (bearing of trend) that is difficult to make the column toner is consistent accurately at main scanning direction (direction that intersects vertically with sense of rotation).This be because, rapid because of processing speed, the time by transfer nip shortens, thereby makes friction force act on the time decreased of column toner.
Relative with it, in the image processing system that present embodiment relates to, by making toner image be transferred to the step of intermediate transfer belt 7 from photosensitive drums 3a～3d, between photosensitive drums 3a～3d and intermediate transfer belt 7, apply the transfer voltage that makes alternating voltage overlap onto DC voltage, relax the toner cohesion in the transfer nip.So, even when friction force acts on the time decreased of toner, also be easy to apply friction force to each toner particle, the long axis direction (bearing of trend) that can make the column toner is consistent at main scanning direction (direction that intersects vertically with sense of rotation).
But when excessively reducing the toner cohesion, producing toner disperses/image deflects such as a disorder/resend increase.Therefore, be that appropriateness keeps the cohesion of column toner, the peak value that preferably makes alternating voltage is more than the 500V, below the 1200V, makes frequency to be (vibration number of the middle toner of the contact site of photosensitive drums 3a～3d and intermediate transfer belt 7 (transfer nip) is more than 28.9 times, below 72.25 times) more than the 1000Hz, below the 2500Hz to peak value.So, no matter the processing speed of equipment what, all can not produce toner disperses/disorder/make the long axis direction (bearing of trend) of column toner in main scanning direction (direction vertical with sense of rotation) unanimity with resending image deflects such as increase.
And preferably making transfer voltage is more than the 2000V, below the 3300V.When transfer voltage during less than 2000V, the electric field intensity in the transfer nip becomes insufficient, so transfer efficiency descends.And, when transfer voltage surpasses 3300V, in transfer nip, producing discharge, the electric field of the actual effect in space descends, so transfer efficiency descends.Relative with it, be more than the 2000V, below the 3300V by making transfer voltage, can suppress the decline (keeping transfer efficiency more than 80%) of transfer efficiency, and can not produce the dot image transfer printing column mussily toner that toner disperses etc. and to cause.
In addition, shown in the image processing system 100b as shown in Figure 6, toner image on photosensitive drums 3a～3d directly is being transferred in the structure of recording paper P, also following structure: between the translational speed of the peripheral speed of photosensitive drums 3a～3d and transfer printing body (recording paper P), velocity contrast is set, and applies transfer bias to the overlapping AC bias of Dc bias.
So, in structure, can obtain and between the peripheral speed of the peripheral speed of photosensitive drums 3a～3d and transfer printing body (intermediate transfer belt 7), velocity contrast is set and applies effect identical when AC bias overlapped onto the transfer bias of Dc bias with intermediate transfer belt 7.
As mentioned above, image processing system of the present invention has: image-carrier; The 1st driver element drives above-mentioned image-carrier rotation; Charged elements makes above-mentioned image-carrier charged; Latent image forms the unit, forms electrostatic latent image on above-mentioned charged image-carrier; Developing cell makes the electrostatic latent image that forms on the above-mentioned image-carrier develop by the column toner with the shape that extends to form to a direction, and forms toner image; The 2nd driver element makes transfer printing body move with respect to above-mentioned image-carrier; And transfer printing unit, above-mentioned image-carrier is contacted with above-mentioned transfer printing body, toner image on the above-mentioned image-carrier is transferred to above-mentioned transfer printing body, it is characterized in that the translational speed of the above-mentioned transfer printing body in the translational speed of the above-mentioned image-carrier in the contact site of above-mentioned image-carrier and above-mentioned transfer printing body and the above-mentioned contact site differs from one another.
According to above-mentioned structure, differ from one another by the translational speed of the image-carrier in the contact site that makes image-carrier and transfer printing body and the translational speed of transfer printing body, produce friction force between image-carrier and transfer printing body, the long axis direction (bearing of trend) that can make the column toner by this friction force is in main scanning direction (direction vertical with sense of rotation) unanimity.So, can enlarge the contact area between toner, improve the cohesiveness of toner, prevent that toner from dispersing.And, can prevent to produce between the toner gap, thereby can prevent to produce density unevenness in the toner image after the transfer printing.
And, by using the column toner, can make image concentration stabilization, improve deep or light (gray scale) controlled, improve resolution, prevent to pollute and the flying dust (flying spot) during transfer printing, prevent that the toner particle from forming plated film etc. on developer roll and photoreceptor.
In addition, the also recording medium of sheet of above-mentioned transfer printing body.Perhaps, above-mentioned transfer printing body also will be transferred to the intermediate transfer body of sheet-shaped recording medium from the toner image of above-mentioned image-carrier transfer printing.And above-mentioned sheet-shaped recording medium for example is the recording medium of film like such as paper, transparent membrane.
And above-mentioned transfer printing unit has: transfer member, dispose relative with above-mentioned transfer printing body; And voltage applying unit, there is the transfer voltage of alternating voltage to be applied between above-mentioned image-carrier and the above-mentioned transfer member with overlapping on the DC voltage.
According to above-mentioned structure, between image-carrier and transfer printing body, produce friction force, and the power of the electric field that produces by transfer voltage, can appropriateness reduce the toner cohesion in the transfer nip.Therefore, be easy to apply friction force, thereby be easy to make toner direction unanimity to each toner particle.Consequently, can not produce that toner disperses, point is disorderly, resend the image deflects that increase etc. causes, can make the long axis direction of cylindric toner consistent on main scanning direction more effectively.Therefore, can enlarge the contact area between toner, prevent more effectively or reduce dispersing of toner.And, can eliminate (or reducing) and be used for gap between toner that image forms, and the anti-effect of dispersing by above-mentioned toner, the image that can prevent conscientiously or reduce after the photographic fixing produces density unevenness.
And the maximum potential of above-mentioned alternating voltage and the difference of minimum level are more than the 500V, below the 1200V, and frequency is more than the 1000Hz, below the 2500Hz.And, the maximum potential of above-mentioned alternating voltage and the difference of minimum level also can be for more than the 500V, below the 1200V, and frequency is that to make the vibration number of the toner in the contact site of above-mentioned transfer printing body and above-mentioned image-carrier be frequency more than 28.9 times, below 72.25 times.
According to above-mentioned structure, can not can produce that toner disperses, point is disorderly, resend the image deflects that increase etc. causes, make the long axis direction of cylindric toner consistent on main scanning direction.
And the size of above-mentioned transfer voltage is more than the 2000V, below the 3300V.
According to above-mentioned structure, can suppress the decline of transfer efficiency, and can not can produce the toner toner of transfer printing column mussily of the dot image that causes such as disperse.
And, above-mentioned transfer printing unit has the abutting part by above-mentioned transfer printing body and above-mentioned image-carrier butt, above-mentioned image-carrier is cylindric, above-mentioned transfer printing body moves on the tangential direction of the formed circle in the cross section of above-mentioned image-carrier, and above-mentioned butt parts are arranged on above-mentioned tangent line and compare moving direction downstream one side of leaning on above-mentioned transfer printing body with the point of contact of above-mentioned circle.
According to above-mentioned structure, the butt parts are arranged on downstream one side of comparing with the point of contact of above-mentioned tangent line and above-mentioned circle by the moving direction of transfer printing body, compare when therefore being arranged on the above-mentioned point of contact with these butt parts, but the area of the contact site of expanded view image carrier and transfer printing body.So, but the zone that produces friction force between expanded view image carrier and the transfer printing body makes the long axis direction unanimity of column toner more effectively.Therefore, can further improve the anti-effect and the anti-density unevenness effect of dispersing of toner.And, can improve the transfer efficiency of toner.
And the translational speed of the above-mentioned transfer printing body in the contact site of above-mentioned image-carrier and above-mentioned transfer printing body is faster than the translational speed of the above-mentioned image-carrier in the above-mentioned contact site.
According to above-mentioned structure, translational speed by the transfer printing body in the contact site that makes image-carrier and transfer printing body is greater than the translational speed of image-carrier, and it is bad to prevent to produce the transfer printing that the toner that is transferred to the transfer printing body surface caused by the wiping phenomenon of the surperficial wiping of image-carrier.In addition,, be easy to produce the hollow phenomenon that lacks parts such as fine rule, word segment, but by above-mentioned structure, can prevent that the transfer printing of this hollow phenomenon etc. is bad when producing transfer printing that the wiping phenomenon causes when bad.
And in the above-mentioned column toner, the ratio L/R of the radius R of the length L of an above-mentioned direction and the ball identical with this column toner volume is more than 1.75, below 3.63.
According to above-mentioned structure, can make the long axis direction unanimity of the column toner that is transferred to transfer printing body more effectively.Therefore, can further improve disperse effect and prevent the effect of density unevenness of anti-toner.
And in the above-mentioned column toner, the shape in the cross section vertical with an above-mentioned direction can be roughly circle.In addition, circular is meant not necessarily strict circle, comprises the shape that can be considered circular in fact.Particularly, circular is that circularity (when the girth that the girth of establishing above-mentioned cross section is made as the circle that L1 and above-mentioned area of section equate is made as L2, the index of representing with L2/L1) is 1 ± 0.2 shape.
According to above-mentioned structure, the shape in the cross section vertical with an above-mentioned direction is circular in the column toner, therefore can make the long axis direction unanimity of the column toner that is transferred to transfer printing body effectively.Therefore, can further improve disperse effect and prevent the effect of density unevenness of anti-toner.
And, also can have a plurality of above-mentioned image-carriers, by above-mentioned a plurality of image-carriers the multicolor image coincidence is transferred on the above-mentioned transfer printing body.
According to above-mentioned structure, owing to can make the long axis direction unanimity that is transferred to the toner of transfer printing body from each image-carrier, therefore can enlarge the contact area between toner, improve the cohesiveness of toner.So, except can be prevented from each image-carrier be transferred to transfer printing body toner anti-toner dispersion effect and reduce the density unevenness effect, the toner that produces transfer printing body one side in the time of can preventing the coincidence after the 2nd kind of color moves to the phenomenon of photoreceptor one side, maybe should remain in the phenomenon on the photoreceptor from the toner that photoreceptor is transferred to transfer printing body.So, can carry out the coincidence of polychrome toner image well, prevent to produce irregular colour in the image after transfer printing has toner image of all kinds.
It is clear and definite that more than Shuo Ming embodiment and embodiment only are used to make technology contents of the present invention, must not be defined in the explanation that this concrete example is made narrow sense, within purport of the present invention and the described scope of claim, can carry out various changes and enforcement.
Claims (11)
1. an image processing system has: image-carrier; The 1st driver element drives above-mentioned image-carrier and makes it rotation; Charged elements makes above-mentioned image-carrier charged; Latent image forms the unit, forms electrostatic latent image on above-mentioned charged image-carrier; Developing cell makes the electrostatic latent image that forms on the above-mentioned image-carrier develop by the column toner with the shape that extends to form to a direction, and forms toner image; The 2nd driver element makes transfer printing body move with respect to above-mentioned image-carrier; And transfer printing unit, above-mentioned image-carrier is contacted with above-mentioned transfer printing body, the toner image on the above-mentioned image-carrier is transferred to above-mentioned transfer printing body, this image processing system is characterised in that,
The translational speed of the above-mentioned image-carrier in the contact site of above-mentioned image-carrier and above-mentioned transfer printing body is made as V1, and the translational speed of the above-mentioned transfer printing body in the above-mentioned contact site is made as V2, then satisfies 0.99≤V1/V2＜1.
2. image processing system according to claim 1 is characterized in that, above-mentioned transfer printing unit has: transfer member, dispose relative with above-mentioned transfer printing body; And voltage applying unit, will be applied between above-mentioned image-carrier and the above-mentioned transfer member at the transfer voltage of overlapping alternating voltage on the DC voltage.
3. image processing system according to claim 2 is characterized in that, the maximum potential of above-mentioned alternating voltage and the difference of minimum level are more than the 500V, below the 1200V, and frequency is more than the 1000Hz, below the 2500Hz.
4. image processing system according to claim 2, it is characterized in that, the maximum potential of above-mentioned alternating voltage and the difference of minimum level be 500V above, below the 1200V, and frequency is that to make toner vibration number in the contact site of above-mentioned transfer printing body and above-mentioned image-carrier be frequency more than 28.9 times, below 72.25 times.
5. image processing system according to claim 2 is characterized in that, the size of above-mentioned transfer voltage is more than the 2000V, below the 3300V.
6. image processing system according to claim 1 is characterized in that above-mentioned transfer printing body is a sheet-shaped recording medium.
7. image processing system according to claim 1 is characterized in that, above-mentioned transfer printing body is the intermediate transfer body that the toner image from above-mentioned image-carrier transfer printing is transferred to sheet-shaped recording medium.
8. image processing system according to claim 1 is characterized in that,
Above-mentioned transfer printing unit has the butt parts by above-mentioned transfer printing body and above-mentioned image-carrier butt,
Above-mentioned image-carrier is cylindric, and above-mentioned transfer printing body moves on the tangential direction of the circle of the cross section of above-mentioned image-carrier formation, and above-mentioned butt parts are arranged on above-mentioned tangent line and compare moving direction downstream one side of leaning on above-mentioned transfer printing body with the point of contact of above-mentioned circle.
9. image processing system according to claim 1 is characterized in that, in the above-mentioned column toner, the ratio L/R of the radius R of the length L of an above-mentioned direction and the ball identical with this column toner volume is more than 1.75, below 3.63.
10. image processing system according to claim 1 is characterized in that, the shape in the cross section vertical with an above-mentioned direction is roughly circle in the above-mentioned column toner.
11. image processing system according to claim 1 is characterized in that, has a plurality of above-mentioned image-carriers, by above-mentioned a plurality of image-carriers multicolor image is overlapped to be transferred on the above-mentioned transfer printing body.
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| JP2006336287 | 2006-12-13 | ||
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| JP2007311630 | 2007-11-30 | ||
| JP2007311630A JP4257381B2 (en) | 2006-12-13 | 2007-11-30 | Image forming apparatus |
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| CN100595691C true CN100595691C (en) | 2010-03-24 |
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| JP5151929B2 (en) * | 2008-11-25 | 2013-02-27 | コニカミノルタビジネステクノロジーズ株式会社 | Image forming apparatus |
| JP5489556B2 (en) * | 2009-06-30 | 2014-05-14 | キヤノン株式会社 | Image forming apparatus |
| JP5900794B2 (en) * | 2011-06-22 | 2016-04-06 | 株式会社リコー | Image forming apparatus |
| JP6168818B2 (en) * | 2012-04-03 | 2017-07-26 | キヤノン株式会社 | Image forming apparatus |
| US10099421B2 (en) * | 2016-05-12 | 2018-10-16 | Xerox Corporation | 3-D printing using intermediate transfer belt and curable polymers |
| JP6881060B2 (en) * | 2017-06-15 | 2021-06-02 | 富士フイルムビジネスイノベーション株式会社 | Transfer device, image forming device |
| JP7039904B2 (en) * | 2017-09-21 | 2022-03-23 | 富士フイルムビジネスイノベーション株式会社 | Image forming device |
| JP7077040B2 (en) * | 2018-02-08 | 2022-05-30 | キヤノン株式会社 | Image forming device |
| JP2020190647A (en) * | 2019-05-22 | 2020-11-26 | キヤノン株式会社 | Image formation apparatus |
| US11169473B2 (en) | 2019-03-28 | 2021-11-09 | Canon Kabushiki Kaisha | Image forming apparatus with image bearing member and a belt that contact each other to form a wound area by urging a transfer member toward the image bearing member |
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