EP0399186B1 - Appareil de formation d'images du type humide - Google Patents

Appareil de formation d'images du type humide Download PDF

Info

Publication number
EP0399186B1
EP0399186B1 EP90106434A EP90106434A EP0399186B1 EP 0399186 B1 EP0399186 B1 EP 0399186B1 EP 90106434 A EP90106434 A EP 90106434A EP 90106434 A EP90106434 A EP 90106434A EP 0399186 B1 EP0399186 B1 EP 0399186B1
Authority
EP
European Patent Office
Prior art keywords
toner image
intermediate transferring
image
transferring
toner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90106434A
Other languages
German (de)
English (en)
Other versions
EP0399186A2 (fr
EP0399186A3 (fr
Inventor
Yoshinori C/O Seiko Epson Corporation Miyazawa
Makoto C/O Seiko Epson Corporation Fujino
Hideo C/O Seiko Epson Corporation Yamazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP8536589A external-priority patent/JPH02264280A/ja
Priority claimed from JP29460689A external-priority patent/JPH03154085A/ja
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of EP0399186A2 publication Critical patent/EP0399186A2/fr
Publication of EP0399186A3 publication Critical patent/EP0399186A3/fr
Application granted granted Critical
Publication of EP0399186B1 publication Critical patent/EP0399186B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point

Definitions

  • This invention relates to a wet type image forming apparatus.
  • a wet type image forming apparatus an electrostatic latent image formed on an electrostatic latent image bearer is developed with liquid toner, and transferred onto a recording medium such as a recording sheet, to form an image.
  • the liquid toner means a liquid toner including electrified toner particles containing pigment which are dispersed in an insulation solvent.
  • its latent image bearer is made up of a metal drum, and a latent image bearing layer formed on the metal drum.
  • a latent image formed on the latent image bearer is developed into a toner image, which is then transferred onto a recording sheet while being brought into contact with the latter.
  • the conventional wet type image forming apparatus is still disadvantageous in the following points: With the apparatus, even if the latent image is developed into a toner image with high fidelity, the toner image is not satisfactorily transferred onto a recording sheet if the latter is low in smoothness. In other words, if the recording sheet has an uneven surface, in a transfer process, some of the toner forming the toner image is not brought into contact with the recording sheet, as a result of which the image printed on the recording sheet is low in picture quality. Furthermore, the toner image developed on the electrostatic latent image bearer is wet containing a solvent component in addition to the toner. Therefore, when the toner image is brought into contact with the recording sheet, the solvent may spread thus collapsing the image. In addition, the apparatus needs a high voltage power source providing a voltage of several kilo-volts to transfer a toner image from a toner bearer to the recording sheet.
  • documents US-A-4 007 041 and WO-A- 90 08 984 disclose an electrophotographic printing process, in which an image forming drum transfers a formed image to a secondary drum, which then impresses the image upon a recording medium;
  • document EP-A-0 307 022 discloses an electrostatic transfer roller for transferring a toner image from a photo conductor surface to a recording sheet;
  • document US-A-4 341 455 discloses a belt mechanism for transferring magnetic and conductive toner from a dielectric surface to plain paper.
  • an object of this invention is to eliminate the above-described difficulties accompanying a conventional wet type image forming apparatus.
  • an object of the invention is to provide a wet type image forming apparatus which can form an image high in picture quality on a recording sheet independently of the smooth of the latter, and transferring a toner image can be achieved with a relatively low transferring voltage.
  • a wet type image forming apparatus in which an electrostatic latent image formed on an image bearer is developed with liquid toner, and is then transferred onto a recording medium, which, according to the invention, comprises: first toner image transferring means for electrostatically transferring a toner image developed on the image bearer onto an intermediate transferring medium; and second toner image transferring means for abutting a recording sheet against the intermediate transferring medium to transfer the toner image from the intermediate transferring medium onto the recording sheet.
  • the intermediate transferring medium is made up of an elastic layer which comprises a dielectric layer with a smooth surface to which a toner image is borne.
  • the intermediate transferring medium has an elastic layer which is able to absorb the solvent of a liquid toner, and a pressurizing roll is provided to bring the toner image formed on the intermediate transferring medium into contact with the recording sheet.
  • the image bearer on which a latent image is developed into a toner image with liquid-phase toner; the intermediate transferring medium onto which the toner image is transferred; and the pressurizing roll which abuts a recording sheet against the intermediate transferring medium to transfer the toner image onto the recording sheet which further comprises: a corotron for reducing the potential of the toner image transferred onto the intermediate transferring medium; and means for applying a mold releasing agent to the intermediate transferring medium before the toner image is transferred from the image bearer onto the intermediate transferring medium.
  • a recording sheet 9 is supplied from a sheet supplying unit 101 and conveyed to a transferring position while being synchronized with the rotations of a photo-sensitive drum 1 which acts as an image bearer and an intermediate transferring drum 5 by timing rollers 102.
  • a charging unit 2, an exposing unit 3 (or a laser scanner in the embodiment), a developing unit 4, the intermediate transferring drum 5, a cleaning unit 6, and a discharging unit 7 are arranged around the photo-sensitive drum 1.
  • the recording sheet on which a toner image has been transferred is delivered by a conveying belt 112 to a stacker 111 through a fixing unit 11.
  • a developing operation is carried out with a liquid toner which is prepared by dispersing charged resin in an insulating carrier liquid solvent; that is, a wet type developing operation is carried out.
  • the liquid toner in the developing unit 4 is applied to the photo-sensitive drum with developing rollers 41, and excess liquid toner is removed from the drum with a squeezing roller 42.
  • the photo-sensitive drum 1 is formed by providing a photo-sensitive layer on an aluminum pipe.
  • an image transferring operation is carried out as follows: A potential difference is provided between the intermediate transferring drum 5 and the aluminum pipe of the photo-sensitive drum 1, so that a toner image on the photo-sensitive drum is transferred onto the intermediate transferring drum through electrostatic field. Since the intermediate transferring drum has a smooth cylindrical wall, the toner image is transferred from the photo-sensitive drum onto the intermediate transferring drum with high fidelity. In this operation, because the pressure applied between the intermediate transferring drum and the photo-sensitive drum may be small, the photo-sensitive drum is preventable from being degraded.
  • the recording sheet 9 is abutted against the intermediate transferring drum 5, and is then pushed against it by a pressurizing roller 8, so that the toner image is transferred onto the recording sheet.
  • the intermediate transferring drum 5, as shown in Fig. 3, comprises: a hollow metal drum 50; and a conductive elastic layer 51 formed on the outer wall of the metal drum 50.
  • a potential difference is provided between the metal base of the photo-sensitive drum and the hollow metal drum of the intermediate transferring drum to form a transferring field between the elastic layer 51 and the toner image on the photo-sensitive drum 1 thereby to transfer the toner image onto the intermediate transferring drum 5 in an electrostatic mode.
  • the elastic layer 51 of the intermediate transferring drum 5 being smooth, the toner image on the photo-sensitive drum 1 is, in its entirety, brought into contact with the intermediate transferring drum. Therefore, the primary toner image transferring operation is free from the conventional difficulty that transferring the toner image is not completely achieved because a part of toner forming the toner image cannot come into contact with the transferring medium due to the unevenness of the transferring medium.
  • the pressurizing roll 8 is pushed against the intermediate transferring drum 5 through the recording sheet 9, as a result of which the elastic layer 51 is deformed according to the irregularity of the surface of the recording sheet 9. Then, all the toner forming the toner image borne to the intermediate transferring drum can put in close contact with the uneven surface of the recording sheet. Therefore, the toner image is mechanically transferred onto the recording sheet 9 with high fidelity independently of the smoothness of the recording sheet 9.
  • the elastic layer 51 of the intermediate transferring drum 5 is made of a material excellent in mold releasing characteristic.
  • the pressurizing roll 8 As the pressurizing roll 8 is abutted against the intermediate transferring drum 5, it is unnecessary to drive the pressurizing roll 8; that is, the pressurizing roll 8 is turned with no slip with the intermediate transferring drum 5. Accordingly, the recording sheet 9, while being held between the pressurizing roll 8 and the intermediate transferring drum 5, is conveyed with no slip with the intermediate transferring drum 5. This will prevent the occurrence of a difficulty that, when transferred, the image is lowered in quality because of the irregular conveyance of a recording sheet such as the jittering of a recording sheet.
  • a potential difference may be provided between the pressurizing roll 8 and the intermediate transferring drum 5; that is, also in the secondary toner image transferring operation, electrostatic energy may be additionally utilized.
  • Fig. 4 is an explanatory diagram showing a primary toner image transferring region.
  • V H is the surface potential of the toner layer
  • V P is the transferring voltage applied to the metal base of the intermediate transferring drum
  • d o / ⁇ o is the effective dielectric thickness of the transferring medium, or the effective dielectric thickness of the elastic layer of the intermediate transferring drum
  • d m and ⁇ m are the thickness and dielectric constant of the photo-sensitive layer of the photo-sensitive drum
  • respective, d t and ⁇ t are the thickness and dielectric constant of the toner layer on the photo-sensitive drum
  • g is the gap between the toner layer and the elastic layer
  • ⁇ s is the dielectric constant of the solvent
  • d t / ⁇ t and g/ ⁇ s are about 1 ⁇ m, and are smaller than d m / ⁇ m which is about 7 ⁇ m, thus less affecting the transferring filed E of Equation (1).
  • the degree of freedom of setting d m / ⁇ m is not so large because of the charging, photo-sensitive and developing characteristics of the photo-sensitive drum. Therefore, the transferring field E of Equation (1) depends greatly on the effective dielectric thickness d o / ⁇ o . That is, in order to obtain a high transferring field with a low transferring voltage, it is essential to reduce the effective dielectric thickness d o / ⁇ o .
  • the elastic function of the elastic layer 51 is utilized to bring the intermediate transferring drum 5 into close contact with the recording sheet 9.
  • the elastic layer 51 should be relatively large in thickness because, if the thickness of the elastic layer 51 is small, its sufficient elastic effect cannot be expected. That is, the elastic layer should be 0.5 to 2.5 mm in thickness for a sufficient elastic effect.
  • the effective dielectric thickness of the elastic layer 51 is small, whereas it is desired in the secondary toner image transferring operation that the thickness of the elastic layer 51 is large. More specifically, it is desired that the elastic layer 51 is 0.5 to 1.5 mm in thickness, and yet the effective dielectric thickness is reduced. In this case where the elastic layer 51 made of the electrically conductive rubber with good unsticking property is employed, the elastic layer 51 is zero (0) in effective dielectric thickness, and therefore a high transferring field can be obtained in the primary toner image transferring operation, and the elastic layer 51 bearing the toner image can be brought into close contact with the recoding sheet 9 in the secondary toner image transferring operation,
  • Fig. 2 shows a sectional view of another intermediate transferring drum.
  • the intermediate transferring drum comprises a hollow metal drum 50 and an elastic layer 51 provided on the outer periphery of the metal drum 50.
  • the elastic layer 51 comprises a rubber layer 54 and an electrically conductive layer 53 supported by the rubber layer 54.
  • the electrically conductive layer 53 may be formed according to a method in which a resin layer containing electrically conductive compound is formed on a rubber layer, or a thin metal layer is formed on a rubber layer by plating or vacuum deposition.
  • Fig. 5 is a perspective view, with parts cut away, showing s pressure roll 8 in a printer.
  • the pressurizing roll 8 is in the form of a cylinder, and it accommodates a heat source 80 such as a ceramic heater or halogen lamp, to operate also as heat roll.
  • a heat source 80 such as a ceramic heater or halogen lamp
  • electrostatic energy, pressure and heat are applied at the same time, so that the toner image is fixed to the recording sheet.
  • the toner image is heated, the toner resin component is molten, as a result of which the mold release characteristic is improved; that is, the toner image is removed from the elastic layer 51 more readily; while, at the contact region of the recording sheet and the toner image, the gaps between fibers of the recording sheet are filled with the molten toner by pressure. That is, the image transferring operation and the image fixing operation are achieved simultaneously, and therefore the fixing unit may be eliminated.
  • the elastic layer 51 is heated, the solvent absorbed by the elastic layer in the primary toner image transferring operation is evaporated.
  • the elastic layer 51 of the intermediate transferring drum 5 is a heat-resisting layer.
  • silicone rubber is used for fabrication of the elastic layer or silicone coating is applied. This is suitable for ensuring the heat resistance of the elastic layer 51.
  • the intermediate transferring drum is in the form of a cylinder. However, it may be in the form of an endless belt.
  • transferring the toner image is achieved mainly by the electrostatic energy
  • a mechanical force is mainly employed.
  • the belt-shaped intermediate transferring medium and a pressurizing roll which functions also as a heating roller are used in combination, then transferring and fixing the toner image can be achieved simultaneously.
  • Fig. 6 shows the electrophotographic printer of the invention, in which there is provided a toner electric charge removing device 14.
  • the toner image formed on the photosensitive drum is first transferred onto an intermediate transferring drum, and the toner image thus formed on the intermediate transferring drum is then secondly transferred onto a recording sheet while the intermediate transferring drum is abutted against the recording sheet.
  • Fig. 7 is a diagram showing reduction of the potential of the toner image on the intermediate transferring drum.
  • the AC corotron 14 is so designed that a tungsten wire 80 0.05 mm in diameter is shielded with a housing 81 in such a manner that the housing 81 is spaced 5 mm from the tungsten wire 86.
  • a voltage of an AC voltage peak to peak 8-9 KV with a frequency of 500 Hz - 1 KHz superimposed on a DC voltage 0 - +300 V is applied to the tungsten wire.
  • the AC corotron is so positioned that it is spaced 1 to 3 mm from the intermediate transferring drum 5.
  • the toner transferred onto the intermediate transferring drum 5 sticks to the elastic layer 51 to form a capacitor, thus providing a potential difference with respect to the intermediate transferring drum.
  • the toner is stuck to the intermediate transferring drum in an electrostatic mode.
  • application of positive and negative ions 84 to the toner image can reduce the electrostatic sticking force acting between the toner 83 and the intermediate transferring drum 5.
  • the pressurizing roll 8 is pushed against the intermediate transferring drum 5 through the recording sheet 9, so that the elastic layer 51 is deformed in correspondence to the fine unevenness of the recording sheet surface.
  • the toner image is transferred onto the recording sheet 9 with high fidelity, independently of the smoothness of the recording sheet 9.
  • the toner image on the intermediate transferring drum 5 is not so affected by the electrostatic sticking force, and therefore the mechanical elastic force and mold release characteristic of the elastic layer 51 allows the toner image to be transferred onto the recording sheet 9 with high fidelity.
  • the toner electric charge removing device is effective in any case where the surface of the elastic layer of the intermediate transferring drum is electrically conductive, or insulative. Particularly, in the case where the elastic layer is insulative, not only the electric charge of the toner, but also the electric charge on the elastic layer can be removed by the toner electric charge removing device.
  • Fig. 8 is a sectional view showing the arrangement of a printer, another embodiment of the invention.
  • This embodiment is different in arrangement from other embodiment only in that mold releasing agent applying unit 20 is so positioned to apply a mold releasing agent to the intermediate transferring drum 5 before the toner image is transferred from the photo- sensitive drum 1 onto the intermediate transferring drum 5 from which the toner has been removed by the cleaning unit 6.
  • the mold releasing agent is silicone oil.
  • the mold releasing agent applying unit 20 is a silicone oil impregnated pad. The pad is pushed against the intermediate transferring drum 5 to apply silicone oil to a thickness of the order of sub- microns. The toner image is transferred from the photo-sensitive drum 1 onto the intermediate transferring drum 5 which has been coated with silicone oil.
  • the potential of the toner image on the intermediate transferring drum 5 is reduced by the DC corotron 14 and then the toner image is transferred onto the recording sheet 9.
  • the mold releasing agent silicone oil, applied to the intermediate transferring drum, the secondary toner image transferring operation is achieved with ease.
  • the provision of the mold releasing agent applying unit 20 makes it possible to use an elastic material such as urethane rubber low in mold releasing characteristic to form the intermediate transferring drum.
  • the intermediate transferring medium is in the form of a drum; however, it goes without saying that it may be in the form of an endless belt.
  • the toner image transferred onto the intermediate transferring roller is further transferred onto the recording sheet which is pushed against the intermediate transferring roller. Therefore, the toner image is transferred satisfactorily onto the recording sheet independently of the surface roughness of the latter.
  • the intermediate transferring medium is made up of the elastic layer, which is formed of the electrically conductive rubber having a smooth surface, or which comprises the electrically conductive rubber layer and the relatively thin dielectric layer having a smooth surface. Therefore, with a relatively low transferring voltage, the toner image formed on the electrostatic latent image bearer can be electrostatically transferred onto the intermediate transferring medium with high fidelity, and then the toner image on the intermediate transferring medium can be brought into close contact with the recording sheet which is uneven. That is, the toner image can be satisfactorily transferring onto the recording sheet independently of the surface roughness of the latter.
  • the recording sheet is conveyed while being kept in close contact with the intermediate transferring medium; that is, the recording sheet is conveyed with no slip with respect to the intermediate transferring drum. Therefore, the image forming apparatus of the invention is free from the difficulty that the printed image is low in picture quality because of the irregular conveyance of the recording sheet.
  • the toner image transferring operation is stably carried out independently of atmospheric conditions such as temperature and humidity.
  • the pressurizing roll incorporating a heat source By using the pressurizing roll incorporating a heat source, the transferring operation and the fixing operation can be achieved simultaneously, so that the fixing unit can be eliminated.
  • the intermediate transferring medium is made up of the elastic layer which has a smooth surface and is able to absorb the solvent of the liquid-phase toner. Therefore, after the toner image has been electrostatically transferred onto the intermediate transferring medium with high fidelity, the toner image on the intermediate transferring medium can be brought into close contact with the recording sheet which is uneven. Thus, the toner image can be completely transferred onto the recording sheet; that is, the resultant image formed on the recording sheet is excellent in picture quality.
  • the means for reducing the potential of the toner image transferred onto the intermediate transferring medium is provided; that is, the electrostatic sticking force of the toner image to the intermediate transferring medium can be reduced, whereby the transferring of the toner image onto the recording sheet is readily achieved by the mechanical elastic force and mold release characteristic of the intermediate transferring medium.
  • the intermediate transferring medium which is made up of the elastic layer whose surface is smooth, the toner image is completely transferred onto the intermediate transferring medium in the primary toner image transferring operation, and in the secondary toner image transferring operation the image is printed excellent in picture quality on the recording sheet.
  • the intermediate transferring medium is provided with the mold releasing agent applying means, the toner image transferred onto the intermediate transferring medium is more readily transferred onto the recording sheet, and in addition the intermediate transferring medium can be fabricated by using an elastic material lower in mold releasing characteristic.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Claims (6)

  1. Appareil de formation d'images du type humide dans lequel une image est formée sur un support d'écriture (9), ledit appareil comprenant :
    a) un dispositif de support d'image (1) sur lequel une image latente électrostatique est développée en une image encrée avec de l'encre liquide;
    b) un support intermédiaire de transfert (5) ayant au moins une couche extérieure élastique (51) sur laquelle ladite image encrée est transférée depuis ledit dispositif de support d'image (1);
    c) des premiers moyens de transfert d'image encrée, pour transférer électrostatiquement ladite image encrée développée sur ledit dispositif de support d'image (1) sur ledit support intermédiaire de transfert (5);
    d) des seconds moyens de transfert d'image encrée (8) qui amènent une feuille d'écriture (9) en butée contre ledit support intermédiaire de transfert (5), pour transférer ladite image encrée dudit support intermédiaire de transfert (5) sur ladite feuille d'écriture (9), comprenant un rouleau presseur (8) pour amener ladite feuille d'écriture (9) en contact étroit avec ledit support intermédiaire de transfert (5) pour transférer ladite image encrée dudit support intermédiaire de transfert (5) sur ladite feuille d'écriture;
       dans lequel un corotron (14) est fourni pour réduire le potentiel de ladite image encrée transférée sur ledit support intermédiaire de transfert (5).
  2. Appareil de formation d'images du type humide conformément à la revendication 1, dans lequel ladite couche élastique (51) comprend une couche électriquement conductrice (53) avec une surface lisse.
  3. Appareil comme revendiqué dans la revendication 1 ou 2, dans lequel ladite couche élastique (51) comprend une couche diélectrique mince (52) dont la surface est lisse et une couche électriquement conductrice (53) supportant ladite couche diélectrique mince (52).
  4. Appareil comme revendiqué dans l'une quelconque des revendications 1 à 3, dans lequel ledit support intermédiaire de transfert (5) est constitué par une couche élastique (51) qui a une surface lisse et absorbe le solvant de ladite encre liquide.
  5. Appareil de formation d'images du type humide comme revendiqué dans l'une quelconque des revendications 1 à 4, dans lequel lesdits seconds moyens de transfert d'encre (8) pour transférer l'image encrée sur un support d'écriture (9) incorporent une source de chaleur (80).
  6. Appareil de formation d'images du type humide comme dans l'une quelconque des revendications 1 à 5, dans lequel des moyens d'application d'agent de démoulage (20) sont fournis pour appliquer un agent de démoulage sur ledit support intermédiaire de transfert (5) avant que ladite image encrée soit transférée dudit dispositif de support d'image (1) sur ledit support intermédiaire de transfert (5).
EP90106434A 1989-04-04 1990-04-04 Appareil de formation d'images du type humide Expired - Lifetime EP0399186B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP85365/89 1989-04-04
JP8536589A JPH02264280A (ja) 1989-04-04 1989-04-04 湿式画像形成装置
JP29460689A JPH03154085A (ja) 1989-11-13 1989-11-13 湿式画像形成装置
JP294606/89 1989-11-13

Publications (3)

Publication Number Publication Date
EP0399186A2 EP0399186A2 (fr) 1990-11-28
EP0399186A3 EP0399186A3 (fr) 1991-09-11
EP0399186B1 true EP0399186B1 (fr) 1994-11-30

Family

ID=26426380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106434A Expired - Lifetime EP0399186B1 (fr) 1989-04-04 1990-04-04 Appareil de formation d'images du type humide

Country Status (2)

Country Link
EP (1) EP0399186B1 (fr)
DE (1) DE69014407T2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387760A (en) * 1990-10-19 1995-02-07 Seiko Epson Corporation Wet recording apparatus for developing electrostatic latent image
US5303013A (en) * 1991-03-18 1994-04-12 Fujitsu Limited Color picture image formation device for developing latent image formed on a photosensitive body
US5187526A (en) * 1991-09-23 1993-02-16 Eastman Kodak Company Method and apparatus of forming a toner image on a receiving sheet using an intermediate image member
IL114992A0 (en) * 1995-08-17 1995-12-08 Indigo Nv Intermediate transfer blanket and method of producing the same
AU2975397A (en) 1997-06-03 1998-12-21 Indigo N.V. Intermediate transfer blanket and method of producing the same
US6141524A (en) * 1999-07-26 2000-10-31 Xerox Corporation Release agent management for transfuse systems
US7395020B1 (en) * 2006-04-28 2008-07-01 Hewlett-Packard Development Company, L.P. Imaging methods, imaging devices, transfer assemblies, and transfer member lubrication assemblies
JP4482572B2 (ja) 2007-05-11 2010-06-16 シャープ株式会社 画像形成装置および画像形成方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0307022A1 (fr) * 1987-08-25 1989-03-15 Stork Research B.V. Rouleau de transfert pour transférer électrostatiquement une image de développateur et dispositif comprenant un ou plusieurs de ces rouleaux

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669706A (en) * 1970-10-19 1972-06-13 Minnesota Mining & Mfg Fusing process and device
US4007041A (en) * 1975-03-10 1977-02-08 Xerox Corporation Electrophotographic printing method
US4341455A (en) * 1979-11-13 1982-07-27 Burroughs Corporation Conducting toner transfer apparatus
JPS56168674A (en) * 1980-05-31 1981-12-24 Konishiroku Photo Ind Co Ltd Image forming method
US4796048A (en) * 1987-11-23 1989-01-03 Xerox Corporation Resilient intermediate transfer member and apparatus for liquid ink development
EP0456733B1 (fr) * 1989-02-06 1995-04-26 Indigo N.V. Systeme d'imagerie
JPH06329774A (ja) * 1993-05-24 1994-11-29 Nippon Shokubai Co Ltd ポリ（ヒドロキシアルカノエート）の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0307022A1 (fr) * 1987-08-25 1989-03-15 Stork Research B.V. Rouleau de transfert pour transférer électrostatiquement une image de développateur et dispositif comprenant un ou plusieurs de ces rouleaux

Also Published As

Publication number Publication date
EP0399186A2 (fr) 1990-11-28
EP0399186A3 (fr) 1991-09-11
DE69014407D1 (de) 1995-01-12
DE69014407T2 (de) 1995-05-11

Similar Documents

Publication Publication Date Title
US3718116A (en) Oil dispensing apparatus
EP0338546A2 (fr) Dispositif à charger et appareil de formation d'images utilisant un tel dispositif
US3745972A (en) Wicking apparatus
US5459558A (en) Charging device, image forming apparatus with same and a process unit detachably mountable to the image forming apparatus
US5233396A (en) Intermediate transfer member having a low surface energy compliant structure and method of using same
US3980424A (en) Fuser cleaning roller
EP0399186B1 (fr) Appareil de formation d'images du type humide
EP0572738B1 (fr) Dispositif de chargement, appareil de formation d'images et unité de traitement montée de manière amovible dans cet appareil
EP0523631B1 (fr) Appareil d'impression électrophotographique
EP0401749B1 (fr) Appareil d'enregistrement par voie humide
US5805962A (en) Auxiliary charging device of electrophotography printing apparatus
KR100191208B1 (ko) 감광드럼의 오염을 방지할 수 있는 전사롤러
US3966394A (en) Plural cleaning rolls assembly
US5001030A (en) Method and means for transferring electrostatically charged image powder
JP3016600B2 (ja) 静電記録装置
US3980423A (en) Fuser cleaning roll assembly
EP0816933B1 (fr) Dispositif et procédé xérographique pour chargement et transfert
US4011831A (en) Oil metering blade loading assembly
JP3076930B2 (ja) 定着装置のオイル塗布機構
JPH02264280A (ja) 湿式画像形成装置
CA1059204A (fr) Lame de dosage d'huile
CA1068764A (fr) Dispositif permettant d'appliquer la resine sur un rouleau de fusion chauffe
JP2634974B2 (ja) 画像形成装置
EP0704773A2 (fr) Appareil et méthode de conditionnement d'une image de toner sec
JP2000098769A (ja) 転写装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19920127

17Q First examination report despatched

Effective date: 19930205

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69014407

Country of ref document: DE

Date of ref document: 19950112

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060329

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060330

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060410

Year of fee payment: 17

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070404

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070404

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070430