WO2003003127A1 - Procede et dispositif de production d'image couleur - Google Patents

Procede et dispositif de production d'image couleur Download PDF

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Publication number
WO2003003127A1
WO2003003127A1 PCT/JP2001/004590 JP0104590W WO03003127A1 WO 2003003127 A1 WO2003003127 A1 WO 2003003127A1 JP 0104590 W JP0104590 W JP 0104590W WO 03003127 A1 WO03003127 A1 WO 03003127A1
Authority
WO
WIPO (PCT)
Prior art keywords
intermediate transfer
transfer
image forming
roller
image
Prior art date
Application number
PCT/JP2001/004590
Other languages
English (en)
Japanese (ja)
Inventor
Susumu Imado
Hisashi Hanzawa
Michio Shimura
Morihisa Kawahara
Tetsuya Takei
Satoshi Seino
Yutaka Sato
Original Assignee
Fuji Xerox Co., Ltd.
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
Application filed by Fuji Xerox Co., Ltd. filed Critical Fuji Xerox Co., Ltd.
Priority to PCT/JP2001/004590 priority Critical patent/WO2003003127A1/fr
Publication of WO2003003127A1 publication Critical patent/WO2003003127A1/fr

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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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • 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
    • G03G15/1615—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 relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points

Definitions

  • the present invention relates to a color image forming method and a color image forming apparatus for forming a color image by an electrophotographic process, and more particularly, to transferring a plurality of color toner images to an intermediate transfer member and superimposing the transferred images. More specifically, the present invention relates to a color image forming method and a color image forming apparatus provided with an intermediate transfer process for transferring images onto an output medium.
  • an image forming apparatus such as a printer that forms a blank image on a sheet using an electrophotographic process is used.
  • This color image forming apparatus includes a method of forming a toner image of each color directly on a sheet, and a method of forming a toner image of each color on an intermediate transfer member and then transferring the toner image of the intermediate transfer member to a sheet. is there.
  • the latter is suitable for high-speed printing because the sheet can be easily transported.
  • a color image forming apparatus using such an intermediate transfer member is roughly classified into a four-pass type and a single-pass type (tandem type). These color image forming apparatuses are disclosed in JP-A-9-134269, JP-A-10-228188, JP-A-2000-147920, JP-A-2000-187403 and the like.
  • the single-pass type is an image forming unit 112 for each of yellow (Y), magenta (M), cyan (C) and black (K). ⁇ 112— 4 in a row.
  • This image forming unit 112—! 1 to 12-4 are provided with photosensitive drums 114-1 to L14-14, and a cleaning blade, a charger, an LED exposure unit, and a developing device are arranged around the photosensitive drum 114-1 to L14-14.
  • the image forming units 112-1 to 112-4 use well-known electrophotographic processes.
  • Transfer rollers 1 18-1 to L 18-4 are provided opposite to each photoconductor drum 1 14—1 to 1 1 4—4, and an intermediate transfer belt 1 16 Moves.
  • the intermediate transfer rollers 118-1-1 and 118-8-4 and the photosensitive drums 114-! In the secondary transfer section, the paper transfer roller 111 and the backup roller are arranged opposite to each other with the intermediate transfer belt 116 interposed therebetween.
  • the transfer process uses the volume resistance of the intermediate transfer belt 116 in the thickness direction.
  • the intermediate transfer belt 1 16 is wrapped around the backup roller 1 1 1, the drive roller 1 13 and the tension opening rollers 1 15 and 1 17. Then, the intermediate transfer belt 1 16 is moved by the rotation of the drive roller 113 driven by a motor (not shown).
  • an object of the present invention is to provide a color image forming method and a color image forming apparatus for preventing an increase in the cost of the apparatus, driving the intermediate transfer member without slipping, and reducing color misregistration. is there.
  • a color image forming method comprises the steps of forming a toner image of a plurality of colors on at least one image carrier, and applying a transfer voltage to an intermediate transfer body driven by a driving roller.
  • the drive roller drives the intermediate transfer member by using an electrostatic attraction generated by an insulating layer of the drive roller by a current flowing through the intermediate transfer member by the transfer voltage.
  • an insulating layer is provided on a driving roller for driving an intermediate transfer member, a capacity C is formed, and a transfer current is used to make an electrostatic attraction force. Is generated, and the intermediate transfer member is attracted to the driving roller. This Therefore, it is possible to drive the intermediate transfer member without slippage without providing a special power supply and a charging unit, and to reduce color misregistration without increasing costs.
  • the driving step includes a step of grounding the metal core of the driving roller, so that a higher electric field can be applied and the electrostatic attraction force can be further improved.
  • the driving step includes a step of applying tension to the intermediate transfer body with a grounded tension roller, so that the intermediate transfer body is used for electrostatic attraction using a tension port.
  • Current route can be formed, and the electrostatic attraction force can be further improved.
  • the primary transfer step includes a step of transferring a transfer voltage to the intermediate transfer member at a position shifted from a contact point of the image carrier on which the toner image is formed with the intermediate transfer member. And transferring the toner image on the image carrier to the intermediate transfer member.
  • the primary transfer step is performed at a position shifted from a contact point of the image carrier on which the toner image is formed with the intermediate transfer body. Applying a transfer voltage to the body, and transferring the toner image on the image carrier to the intermediate transfer body.
  • primary transfer can be performed by effectively using the set surface resistivity.
  • the volume resistivity of the intermediate transfer member is 1 ⁇ 10 9 ⁇ ⁇ ⁇ ! 110 ⁇ 10 "12 ⁇ ⁇ cm, ensuring the charge retention capacity of the belt, increasing the toner's electric attraction (mirror image) to the pelt, and reducing dust.
  • FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment of the present invention.
  • FIG. 2 is a configuration diagram of a main part of FIG.
  • FIG. 3 is an explanatory diagram of a primary transfer method using surface resistance applied to the apparatus of FIG.
  • FIG. 4 is an equivalent circuit diagram of the transfer method of FIG.
  • FIG. 7 is a potential distribution diagram of the drive mechanism of FIG.
  • FIG. 8 is an equivalent circuit diagram of the drive mechanism of FIG.
  • FIG. 9 is a configuration diagram of an image forming apparatus according to another embodiment of the present invention.
  • FIG. 10 is a configuration diagram of an image forming apparatus according to another embodiment of the present invention.
  • FIG. 11 is a configuration diagram of a conventional color image forming apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a configuration diagram of a color image forming apparatus according to an embodiment of the present invention
  • FIG. 2 is a configuration diagram of a main part of FIG. Figure 1 shows the structure of a single-pass (tandem) color page printer as a color image forming apparatus.
  • An intermediate transfer belt 24 used as an intermediate transfer member is arranged in the color pudding 10.
  • the intermediate transfer belt 24 is stretched around a driving roller 26, a tension roller 35, and a backup roller 30 functioning as a driven roller. Then, the intermediate transfer belt 24 rotates counterclockwise in the illustrated case by the rotation of the drive port 26 due to a motor (not shown).
  • Each of the image forming units 12-1 to 12-4 is provided with a photosensitive drum 14-1, 14-2, 14-3, 14-4 as an image carrier.
  • a charger 16 To 16-4, LED array 18-1 to 18-4, developing unit 22 with toner cartridges 20-1 to 20-4; ⁇ 22—4 are arranged.
  • a predetermined voltage set in the range of + 500V to 101,000V from the power supply 40 is applied at the timing of the primary transfer. Is done.
  • a back-up printer 32 is disposed on the upstream side of the intermediate transfer belt 24 opposite to the drive roller 26.
  • a paper transfer roller 45 for applying a secondary transfer voltage via an intermediate transfer belt 24 is arranged for the backup roller 32.
  • a constant current power supply 46 is connected to the paper transfer roller 45, and a specified secondary transfer bias voltage is applied at the timing of the secondary transfer.
  • the toner image superimposed on the intermediate transfer belt 24 is transferred onto the paper 50 sent out from the hopper 48 by the pick-up processor 52 to the paper.
  • the paper on which the image transfer has been performed by the paper transfer roller 45 is heated and fixed by the fixing device 54, and then discharged to a transfer force 60.
  • the fixing device 54 is provided with a heat opening roller 56 and a backup roller 58.
  • a cleaning blade 42 is disposed between the backup roller 32 on the upstream side of the intermediate transfer belt 24 and the first image forming unit 12-1 using yellow toner.
  • An earth roller 44 is disposed at a position opposite to the cleaning blade 42 with the intermediate transfer belt 24 interposed therebetween.
  • the ground roller 44 is a mouthpiece electrically connected to ground.
  • a tension roller 35 is disposed between the drive port roller 26 and the backup roller 32. The tension roller 35 applies a predetermined tension to the intermediate transfer pelt 24, and the tension roller 35 is also electrically grounded.
  • the drive roller 26 and the back-up opening 32 are placed in an electrically floating state.
  • a corona charger, a solid roller charger, or the like can be used as the charging process.
  • non-magnetic one-component contact development using a negatively charged non-magnetic one-component toner is used as a developing method.
  • the development method is not limited to non-magnetic one-component contact development.
  • the charging polarity of the toner is not limited to minus.
  • the intermediate transfer belt 24 is a polycarbonate resin member having a thickness of 150 m, the resistance of which is adjusted with a pressure gauge, and its resistance value is, as described later, the volume resistivity in the belt thickness direction.
  • the surface resistivity of the belt surface is specified within a predetermined range in order to efficiently perform the primary transfer.
  • the material of the intermediate transfer belt 24 is not limited to a polycarbonate resin, and a resin material such as a polyimide-based, nylon-based, or fluorine-based resin can be used.
  • It is arranged to press against 32 with a pressure of about 0.5 to 3 kg.
  • the hardness of the sponge roller 45 is set to 40 to 60 degrees with a force of 1 C.
  • the secondary transfer is performed by a paper transfer roller on the paper 50 which is sent out and conveyed by the pickup roller 52 in a timely manner with respect to the image position on the intermediate transfer belt 24.
  • a specified bias voltage is applied to the intermediate transfer belt 24 by a constant current power supply 46 to electrostatically transfer a color image on the intermediate transfer belt 24.
  • the color image transferred onto the paper 50 is passed through a fixing device 54 composed of a heat roller 56 and a backup port 58, and the developer is thermally fixed on the paper 50. After obtaining a fixed image, it is discharged to 60 psi.
  • the printing speed in a series of color printing processes in such color printing 10, that is, the paper conveyance speed determined by the speed of the intermediate transfer belt 24 is, for example, 91 mm / s.
  • the paper transport speed is not limited to this, and a similar result is obtained at 45 mmZs, which is half of that, and the printing speed is not limited to this, and the same applies even at higher speeds .
  • the transfer voltage of each color used in the primary transfer has the same voltage characteristics that can obtain the same transfer efficiency. This makes it possible to transfer multiple colors with the same voltage, that is, a single power supply, thereby reducing power supply costs. You.
  • the intermediate transfer rollers 38 of each color are provided. 338-4 are located at the same position on the downstream side of the transfer drums of the photoconductor drums 14-1 11 14-4, so that the voltage characteristics of the transfer efficiency of each color have almost the same tendency.
  • the transfer can be performed by a single power supply 40 as shown in FIG. In essence, it is only necessary that the variation of the execution voltage in the transfer nip portion of each color is within the voltage margin of the transfer efficiency, and that the voltage margins of each color overlap.
  • the distance of the intermediate transfer roller to the transfer nip is not limited to the same distance for each color.
  • the intermediate transfer belt 24 as a resistor has a structure stretched by a drive roller 26 and a backup roller 32, and the drive roller 26 and the backup roller 32 are electrically connected. Floating state.
  • the intermediate transfer belt 24 is in contact with the intermediate transfer opening rollers 38-1 to 38-4 and the paper transfer roller 45 for the secondary transfer.
  • the timing for applying the next transfer voltage may overlap the timing for applying the primary transfer voltage.
  • a ground that is electrically grounded between the paper transfer roller 45 to which the secondary transfer voltage is applied and the intermediate transfer roller 38-1 located at the most upstream side to which the primary transfer voltage is applied.
  • the mouth roller 44 is arranged, and the tension roller 35 between the drive roller 26 and the backup roller 32 is electrically grounded.
  • FIG. 3 is an explanatory diagram of the primary transfer
  • FIG. 4 is an equivalent circuit diagram thereof.
  • the intermediate transfer roller 3 8— :! 3 to 8 are made of stainless steel and use rotatable metal rollers with an outer diameter of 8 mm, for example.
  • FIG. 3 shows the photosensitive drum 14 _ 1 provided on the image forming unit 12-1 located on the most upstream side in FIG. 1 and the intermediate transfer roller 38-1 provided correspondingly. And shows the positional relationship with respect to the intermediate transfer pelt 24.
  • the distance L 1 between the center line C extending vertically downward from the center of the photosensitive drum 14-1 and the center line extending vertically downward from the center of the intermediate transfer roller 38-1 is also shown.
  • L 1 10 mm
  • the intermediate transfer roller 38 is located on the upstream side in the belt traveling direction with respect to the contact portion between the photosensitive drum 14-1 and the intermediate transfer belt 24, that is, the transfer nip. — 1 is located.
  • the vertical position of the intermediate transfer roller 38-1 is such that the uppermost part of the center line of the intermediate transfer roller 38-1 is tangent to the lower part of the centerline of the photosensitive drum 141-1. It can also be placed so that it is located above. With such an arrangement of the intermediate transfer roller 38-1, the intermediate transfer belt 24 can contact the photosensitive drum 14-1 with a winding angle, and the width of the transfer nip can be about 1 mm. Like that.
  • the positional relationship of the intermediate transfer opening roller 38-1 with respect to the photosensitive drum 14-1 is shown in FIG. 1 with the remaining photosensitive drums 14-2-4-1-4-4 and the intermediate transfer roller 38-8-2-3. The same applies to 8-4.
  • FIG. 3 shows a case where the primary transfer voltage 40 is applied to the intermediate transfer roller 38-1 which is displaced to the opposite side via the photosensitive drum 14-1 and the intermediate transfer pelt 24.
  • This shows how a current flows through the transfer nip.
  • the intermediate transfer roller 3 8 Taking 1 as an example, when a specified DC voltage, for example, 800 V is applied, the current due to this applied voltage depends on the resistance in the surface direction of the intermediate transfer belt 24 as indicated by an arrow 62. Then, the photosensitive drum 1411 flows to the transfer dip position, which is the belt contact point of the photosensitive drum 141-1.
  • a current flows in the lateral direction of the intermediate transfer belt 24 from the transfer roller 38-1 to the position of the transfer dip. Part of the flow then flows in the thickness direction, that is, the direction in which the volume resistance increases, but most flows in the lateral direction depending on the resistance of the surface of the intermediate transfer belt 24.
  • the current flowing through the transfer nip of the photosensitive drum by applying a voltage to the intermediate transfer roller is mainly a current in the direction of the pelt surface. It can be seen that the voltage depends on the surface resistance in the belt surface direction.
  • the primary transfer current passes from the power supply 40 through the transfer roller 38-1, through the resistance R in the horizontal direction of the intermediate transfer pelt 24, and is exposed to light.
  • Drums 14 flow into one transfer two nips.
  • the transfer method using the conventional volume resistance a voltage is applied in the thickness direction of the thin transfer belt 24. Therefore, when a high transfer voltage is applied, the transfer pelt 24 is thin and thus easily deteriorated by a high electric field.
  • the distance between the transfer nip position (transfer point) and the transfer means 38-1 is set. Therefore, the resistance value R between the transfer voltage application point and the transfer nip position is stable even when the transfer voltage is changed. Therefore, even if a high transfer voltage is applied, the resistance does not change, so that the electrical characteristics (resistance) of the transfer pelt hardly deteriorate. Therefore, even at high-speed printing, the deterioration of the transfer pelt is reduced, and stable transfer is possible.
  • the transfer roller can be arranged at a position shifted from the photosensitive drum, the above-described metal roller can be used as the transfer roller.
  • the metal mouth roller has excellent durability, is inexpensive, and does not generate sponge residue. Therefore, it is possible to provide a high-speed printer with excellent durability at low cost.
  • the surface resistivity and the volume resistivity of the intermediate transfer body (belt) 24 in the transfer method using the surface resistance will be described.
  • the electrical resistance of the intermediate transfer body (belt shape, drum shape) is calculated as the volume resistivity (Q'cm) surface resistance. Rate ( ⁇ / mouth).
  • Q'cm volume resistivity
  • Rate ⁇ / mouth
  • the main purpose of the relationship between the volume resistivity and the surface resistivity is to suppress dust during transfer (the toner is scattered and deteriorates the image). That is, by setting the surface resistivity of the intermediate transfer member to be high, the spread of an unnecessary electric field before and after the transfer is suppressed, so that the toner is prevented from being scattered electrically.
  • transfer voltage is applied not in the thickness direction of the intermediate transfer member but in the surface direction.
  • the transfer efficiency greatly depends on the surface resistance of the intermediate transfer member. That is, in order to obtain a sufficient transfer efficiency and to flow a predetermined transfer current, a higher transfer voltage is required as the surface resistance of the intermediate transfer body is higher.
  • the intermediate transfer member having a higher surface resistance than the volume resistance proposed by the conventional transfer method using the resistance in the thickness direction is used.
  • the requirement for suppressing dust and the requirement for improving transfer efficiency are in a trade-off relationship, and it is difficult to achieve both.
  • the distance between the photosensitive drums is narrow (for example, 50 mm or less). desired.
  • the volume resistivity was good in the range of 1 ⁇ ⁇ ⁇ 9 ⁇ ⁇ ⁇ ⁇ 1 ⁇ ⁇ ⁇ ⁇ 12 ⁇ ⁇ cm under the measurement conditions of applied voltage 500 V and applied time 10 seconds. Good results were obtained. At this time, the transfer efficiency was better when the surface resistivity was smaller than the volume resistivity, and the transfer was possible at a lower voltage.
  • the secondary transfer in the case of the secondary transfer, a transfer method using surface resistance can be used, and the same conditions can be applied.
  • the secondary transfer basically has no effect on the volume resistivity, there is no problem within the numerical range of the volume resistivity described above. This is because the toner is transferred to the medium 50 in the secondary transfer nip portion, and the subsequent behavior of the toner depends on the medium and is not related to the transfer belt.
  • the volume resistivity is large, the electric field at the transfer nip is hard to rise, and the dust before transfer is reduced. At the same time, the charge decay after passing through the transfer nip becomes slow, and the force for holding the toner on the transfer belt increases. In addition, the lower the surface resistivity, the greater the current flowing on the surface of the transfer pelt, as described in Fig. 3, and the easier the transfer.
  • the volume resistivity is preferably in the range of 10-19 to L () Al2Q'cm.
  • the range in which surface resistivity can be created is a difference of about 0.5 to 1 digit, assuming that the volume resistivity is constant.
  • the surface resistivity is preferably in the range of 108 to 10 ⁇ / port.
  • the surface resistivity is the resistivity per unit area, and the resistance increases as the width increases. However, it is not a linear relationship.
  • FIG. 5 the primary transfer rollers 38-4 corresponding to the black photosensitive drums 14-14 are used to transfer the toner image formed on the drums 14-14 onto the belts 14-14.
  • a high voltage of about 1 kV is applied.
  • an insulating layer 26-2 is coated on the surface of the conductive metal core 26-1. Therefore, a capacity C is formed between the belt 24 and the core metal 26-1, with the insulating layer 26-2 interposed therebetween.
  • the insulating layer 26-2 preferably has a volume resistance of 1 * 10E10 to L * 10E14 ⁇ cm.
  • urethane rubber can be used.
  • the resistance R 2 of the resistance (R 1, R 2) of the belt 24 is In parallel, a capacitor C is formed of the insulating layer 26-2.
  • an electrostatic attraction force is generated, and the belt 24 is attracted to the driving roller 26.
  • the intermediate transfer belt 24 does not slide without the need for a special power supply and charging unit. Can move.
  • R1 is smaller than R2
  • a higher electric field can be applied to the driving roller 26. That is, the smaller the distance L 1 from the primary transfer roller 38-4 to the drive roller 26 compared to the distance L 2 from the drive roller 26 to the ground roller 35, the higher the electric field applied to the drive roller 26.
  • the attraction force increases.
  • L 1 be equal to or less than 120 mm.
  • FIG. 9 shows another embodiment of the color printer to which the image forming apparatus of the present invention is applied.
  • the same components as those shown in FIGS. 1 and 2 are denoted by the same symbols.
  • the intermediate transfer pelt 24 is stretched at three points of the drive roller 26, the backup roller 32, and the tension roller 35.
  • the belt space is reduced by arranging them.
  • the image formation unit 1 2— :! The intermediate transfer roller 3 for the primary transfer, which is set to the opposite side across the intermediate transfer belt 24, corresponding to the photosensitive drums 14 to 1 2-4
  • the arrangement of 8-1 to 3-8-4 is changed to Fig.1. That is, the intermediate transfer rollers 38-2 to 38-4 located on the downstream side are arranged at the downstream side of the respective transfer dies as in the embodiment of FIG. Regarding the intermediate transfer roller 38-1, which is located on the upstream side, the transfer It is installed at a distance from the upstream side.
  • the intermediate transfer roller When the intermediate transfer roller is arranged on the upstream side, good transfer efficiency can be obtained on the low voltage side of 100 V or less of the transfer voltage, compared to when the intermediate transfer roller is arranged on the downstream side. A result was obtained in which the transfer efficiency was rapidly decreased on the high voltage side exceeding 1000 V. As a result, the intermediate transfer roller can secure a transfer margin if it is located downstream with respect to the transfer nip of the photoconductor drum, but has a good transfer margin even if it is located upstream. It has been confirmed that there is a voltage margin that provides transfer efficiency o
  • the position of the intermediate transfer roller in the present invention may be not only downstream but also upstream of the transfer nip, and furthermore, as shown in FIG. It turns out that you may.
  • FIG. 10 is a configuration diagram of an image forming apparatus according to still another embodiment of the present invention, in which the primary transfer mechanism and the pelt suction mechanism of the present invention are applied to a conventional four-pass type color electrophotographic mechanism. This is an example.
  • the 4-pass type forms a single photoreceptor drum 100 with four color images of yellow (Y), magenta ( ⁇ ), cyan (C), and black ( ⁇ ). And a developing unit 106 for developing.
  • the surface of the photoconductor drum 100 is uniformly charged by a charger 102 provided following the cleaning blade 101, and then a static latent image is formed by a laser scan of the exposure unit 104. It is formed.
  • an image is formed by developing with the yellow toner of the developing unit 106, and the image is transferred by the transfer roller 38-1 onto the intermediate transfer belt 108 in contact with the photosensitive drum 100. When a voltage is applied, the toner image is transferred electrostatically.
  • the drive roller 26 and the earth roller 35 coated with the insulating layer 26-2 described above can be applied.
  • the above-described primary transfer mechanism that is, the arrangement of the transfer roller 38-1 shifted from the transfer nip position of the photosensitive drum 100, and the primary transfer and the intermediate transfer belt using the surface resistance can be applied.
  • the image forming apparatus is described as a page printer, but can be applied to a copying machine, a facsimile, and the like.
  • the intermediate transfer member is not limited to a pelt-like one, and may be a drum-like one.
  • the intermediate transfer body is not limited to a single-layer one, but may be a multi-layer one for sharing functions.
  • an insulating layer is provided on a driving roller for driving an intermediate transfer member, a capacity C is formed, and an electrostatic attraction force is generated by using a transfer current.
  • the intermediate transfer member is attracted to the driving roller. For this reason, the intermediate transfer member can be driven without slippage without providing a special power supply and charging unit, and the color shift can be reduced without incurring a cost increase.

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

Abstract

La présente invention concerne un dispositif de production d'image couleur permettant de produire sur un support une image révélée de plusieurs couleurs, permettant de réduire le glissement d'un élément de transfert intermédiaire au cours de l'entraînement et permettant de diminuer les défauts de cadrage. Ce dispositif comprend des unités de production d'image (12-1 à 12-4), qui permettent de produire une image révélée de plusieurs couleurs sur au moins un support d'image, un élément de transfert intermédiaire (24), un rouleau d'entraînement (26), qui présente une couche d'isolation (26-2) à sa surface et qui entraîne ledit élément de transfert intermédiaire, un système de transfert primaire (38-1 à 38-4), qui permet d'appliquer une tension de transfert sur ledit élément de transfert intermédiaire (24) entraîné par un rouleau d'entraînement (26) afin de soumettre l'image révélée à un transfert primaire pour chacune des couleurs, ainsi qu'un système de transfert secondaire (32, 45), qui permet d'effectuer un transfert secondaire de l'image révélée de plusieurs couleurs sur ledit élément de transfert intermédiaire sur le support. Le rouleau d'entraînement (26) entraîne l'élément de transfert intermédiaire (24) en mettant en oeuvre une force d'attraction électrostatique produite sur la couche d'isolation (26-2) au moyen d'un courant circulant à travers l'élément (24) en raison d'une tension de transfert primaire.
PCT/JP2001/004590 2001-05-31 2001-05-31 Procede et dispositif de production d'image couleur WO2003003127A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1703337A1 (fr) 2005-03-18 2006-09-20 Ricoh Company, Ltd. Appareil de formation d'images en couleur avec une bande de transfert intermédiaire

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11344871A (ja) * 1998-05-29 1999-12-14 Canon Inc 画像形成装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11344871A (ja) * 1998-05-29 1999-12-14 Canon Inc 画像形成装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1703337A1 (fr) 2005-03-18 2006-09-20 Ricoh Company, Ltd. Appareil de formation d'images en couleur avec une bande de transfert intermédiaire
US7734235B2 (en) 2005-03-18 2010-06-08 Ricoh Company, Ltd. Image forming apparatus including a metallic driving roller

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