JP2014056151A - Transfer device and image forming apparatus - Google Patents

Abstract

The primary transfer pressure is kept constant with a simple configuration and low cost, and the occurrence of abnormal images is suppressed.
An image bearing member that carries a toner image, a transfer member that is transported in a predetermined direction and contacts the image bearing member, thereby forming a toner image carried on the image bearing member, and a transfer member A transfer device including a plurality of transfer means including a contact member that contacts the image bearing member, wherein the transfer means extends the contact member in a direction substantially perpendicular to the conveying direction of the transfer member. A first transfer unit including a stretching member to be moved, and a second transfer including a holding member that is provided on the downstream side with respect to the transfer direction of the transfer member, is rotatable about a support shaft, and holds a contact member Means.
[Selection] Figure 2

Description

  The present invention relates to a transfer device and an image forming apparatus.

  In an electrophotographic image forming apparatus, an electrostatic latent image formed on an image carrier such as a photoconductor disposed in an image forming unit is converted into a toner image by a developing device, and then the toner image is combined with a photoconductor. Primary transfer is performed on the intermediate transfer unit in the vicinity of a primary transfer nip formed by an intermediate transfer unit such as an intermediate transfer belt and a primary transfer unit such as a primary transfer roller. The primary transfer unit is configured to be rotated by a frictional force with the intermediate transfer unit.

  Since the primary transfer roller is rotated during the rotation of the intermediate transfer unit, the primary transfer pressure fluctuates due to the influence of the swing of the primary transfer roller and the tension of the intermediate transfer unit. In order to reduce the influence of the primary transfer roller due to the shake of the primary transfer roller, the primary transfer unit is held by a rotatable support shaft, and the support shaft is located upstream of the image carrier and the primary transfer unit in the transfer belt conveyance direction. It is installed.

  Thereafter, the toner image carried on the intermediate transfer unit is secondarily transferred to a recording medium such as a recording sheet by using a secondary transfer nip portion constituted by the intermediate transfer unit and a transfer roller. Further, an image is formed by applying pressure and heat by a fixing device. Such a technique is already known.

  However, in the conventional transfer device, the thicker the recording medium conveyed to the secondary transfer nip portion of the image forming apparatus using the intermediate transfer means, or the stronger the recording medium, Alternatively, the stronger the curl of the recording medium, the greater the impact generated at the time of collision or contact when the leading edge of the recording medium enters the intermediate transfer means. The impact due to the impact becomes a factor that disturbs the steady transfer linear velocity in the sub-scanning direction of the recording medium when the toner image is primarily transferred from an image carrier such as a photoconductor to the intermediate transfer unit. Yes.

  In addition, the disturbance of the transfer linear velocity disturbs the primary transfer pressure, and as a result, causes image misregistration, color misregistration, and density unevenness called a so-called shock jitter. Further, the resistance generated when the recording medium is caught in the secondary transfer nip portion also causes an action to reduce the belt linear velocity of the intermediate transfer means, and this action is also an image of a shock jitter. This is a cause of occurrence of misregistration and color misregistration.

  When the primary transfer unit is held by a rotatable support shaft, and the support shaft is installed upstream of the image carrier and the primary transfer unit in the transport direction of the transfer belt, the primary transfer pressure due to the shake of the primary transfer roller However, it tends to be susceptible to sudden changes in the speed of the intermediate transfer means. In addition, when the intermediate transfer unit and the image carrier are in contact with each other by a plurality of primary transfer units, since the electrostatic transfer force of the primary transfer is received, the speed variation of the intermediate transfer unit hardly occurs, and the primary primary color When only the transfer means is in contact with the intermediate transfer means and the image carrier, the speed of the intermediate transfer means tends to change easily.

  When a problem such as shock jitter due to a change in the belt linear velocity as described above occurs, when a plurality of images are formed, the primary transfer is in progress when the recording medium enters the secondary transfer nip. The toner image or the intermediate image (hereinafter also simply referred to as an image) to be primarily transferred to the intermediate transfer unit at the primary transfer unit is propagated to the intermediate transfer unit when the impact enters the secondary transfer nip. There was a problem of causing disturbance in the sub-scanning direction.

  Further, since it is necessary to add parts in order to reduce the change in the belt linear velocity, there is a problem that the configuration becomes complicated and the cost increases. Furthermore, even if the change in the belt linear velocity is reduced, the change in the belt linear velocity cannot be completely eliminated, so that the primary transfer pressure is disturbed.

  In Patent Document 1, for the purpose of reducing image disturbance caused by the impact of the recording medium entering the secondary transfer nip and suppressing abnormal images, the impact on the belt when the recording medium enters the endless belt is disclosed. Disclosed is a configuration for secondary transfer of stable images to various recording media such as cardboard, high-rigidity recording media, or recording media with strong curl by buffering and reducing belt linear velocity fluctuations as much as possible. Has been.

  However, as described above, the structure becomes complicated and the cost increases, and even if the change in the belt linear speed is reduced, the change in the belt linear speed cannot be completely eliminated. The problem of being disturbed is still not solved.

  Therefore, the present invention has been made in view of the above-described problems of the prior art, and when the recording member enters the secondary transfer nip while keeping the primary transfer pressure during rotation of the intermediate transfer unit constant. To provide a transfer device and an image forming apparatus that can maintain the primary transfer pressure constant and suppress the occurrence of an abnormal image with a simple configuration and low cost even if the belt linear velocity of the intermediate transfer unit changes. With the goal.

  In order to solve the above-described problem, the transfer device according to the first aspect of the present invention includes an image carrying member that carries a toner image, and the image carrying member that is conveyed in a predetermined direction and abuts on the image carrying member. A transfer device provided with a plurality of transfer means including a transfer member for forming the toner image carried on a member and an abutting member for abutting the transfer member against the image carrying member, The transfer means is provided on the downstream side with respect to the first transfer means including an extension member that extends the contact member in a direction substantially perpendicular to the transfer direction of the transfer member, and with respect to the transfer direction of the transfer member. And a second transfer means including a holding member which is rotatable about a support shaft and holds the contact member.

  According to the present invention, when the recording member enters the secondary transfer nip, even if the belt speed of the intermediate transfer unit changes, the primary transfer pressure is kept constant with a simple configuration and low cost, and an abnormal image is obtained. Thus, it is possible to obtain a transfer device and an image forming apparatus that can suppress the occurrence of the above.

1 is a schematic configuration diagram illustrating an overall configuration of an image forming apparatus according to an embodiment of the present invention. In the image forming apparatus according to the embodiment of the present invention, (a) a diagram illustrating a transfer configuration of a first transfer unit that holds the primary transfer unit in a direction perpendicular to the transfer unit, and (b) a primary transfer unit that is rotatable. It is a figure explaining the transfer structure of the 2nd transfer means to hold | maintain. FIG. 3 is a diagram illustrating a transfer pressure configuration of the image forming apparatus according to the embodiment of the present invention. FIG. 4 is a diagram illustrating toner used in the image forming apparatus according to the embodiment of the invention. FIG. 4 is a diagram illustrating toner used in the image forming apparatus according to the embodiment of the invention. In the image forming apparatus according to the embodiment of the present invention, it is a diagram for explaining a specific example in which the image carrier is a transfer carrier.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified thru | or abbreviate | omitted suitably. In addition, what is called a person skilled in the art can easily change or modify the embodiments of the present invention described in the claims and make other embodiments, and these changes and modifications are described in the claims. The following description is an example of the best mode of the present invention, and does not limit the scope of the claims.

  The present invention relates to a transfer device for transferring an image on an intermediate transfer unit constituted by an endless belt to a recording medium, and a transfer device provided with a mechanism for buffering an impact on the endless belt generated when the leading end of the recording medium enters. The present invention also relates to an image forming apparatus such as a copying machine, a printer, a facsimile, or a multifunction machine having at least two of these functions.

  In short, the present invention is based on the fact that a monochrome primary transfer unit that is susceptible to shock jitter is supported in a direction perpendicular to the transfer belt conveyance direction in an intermediate transfer unit when transferring a toner image onto a transfer material. This makes it less susceptible to sudden changes in the speed of the intermediate transfer means and reduces shock jitter. Further, the primary transfer means of the color, on which shock jitter is unlikely to occur, is held by the transfer means holding means that can rotate around the support shaft, and the support shaft is upstream of the image carrier and the primary transfer means in the transfer belt conveyance direction. It is characterized in that the primary transfer pressure is stabilized by being installed.

  The characteristics of the present invention described above will be described in detail with reference to the drawings. First, the overall configuration of an image forming apparatus according to an embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram for explaining the overall configuration of an image forming apparatus according to an embodiment of the present invention. In particular, for a color image forming apparatus according to an embodiment of the present invention, an image carrier is used as an intermediate transfer body (hereinafter referred to as an image transfer apparatus). , “Intermediate transfer belt”).

  In FIG. 1, an image forming apparatus 100 includes photoconductors 1 a, 1 b, 1 c, and 1 d (hereinafter abbreviated as a to d) that are image carrying members that carry a toner image. A surrounding photosensitive member cleaning unit 2, a blade 3 of the photosensitive member cleaning unit 2, a charger 4, an exposure unit 5, an intermediate transfer belt 10, and the like are arranged. The developing means includes four developing units, a yellow developing unit 6, a magenta developing unit 7, a cyan developing unit 8, and a black developing unit 9. When a full color image is formed, a visible image is formed in the order of the yellow developing unit 6, the magenta developing unit 7, the cyan developing unit 8, and the black developing unit 9, and the visible image of each color is conveyed in a predetermined direction and is photosensitive. By making contact with the body 1, a toner image carried on the photoreceptor 1 is successively transferred onto an intermediate transfer belt 10 that is a transfer member on which an image is formed, thereby forming a full-color image.

  The intermediate transfer belt 10 is stretched by a primary transfer bias roller 11, a secondary transfer counter roller 12, and a tension roller 13, which are contact members for bringing the intermediate transfer belt 10 into contact with the photoreceptor 1, and is not shown. Driven by a motor, the process speed is adjusted to 150 mm / sec. The secondary transfer counter roller 12 also serves as a driving roller for the intermediate transfer belt 10. Each roller is supported from both sides of the intermediate transfer belt by an intermediate transfer belt unit side plate (not shown).

  The primary transfer bias roller 11 is disposed at a contact portion between the photoreceptor 1 and the intermediate transfer belt 10, and a predetermined transfer bias is applied to the primary transfer bias roller 11. In the present embodiment, +1800 V is set to be applied.

The intermediate transfer belt 10 is composed of PVDF (vinylidene fluoride), ETFE (ethylene-tetrafluoroethylene copolymer), PI (polyimide), PC (polycarbonate) or the like in a single layer or a plurality of layers, such as carbon black. The conductive material is dispersed, and the volume resistivity is adjusted to be in the range of 10 ⁸ to 10 ¹² Ω · cm, and the surface resistivity is adjusted to be in the range of 10 ⁹ to 10 ¹³ Ω · cm. If necessary, a release layer may be coated on the surface of the intermediate transfer belt 10.

  Materials used for the coating include ETFE (ethylene-tetrafluoroethylene copolymer), PTFE (polytetrafluoroethylene), PVDF (vinylidene fluoride), PEA (perfluoroalkoxy fluorocarbon resin), FEP (four-fluorocarbon). Fluorine resin such as ethylene fluoride-propylene hexafluoride copolymer) or PVF (vinyl fluoride) can be used, but is not limited thereto. The method of manufacturing the intermediate transfer belt 10 includes a casting method, a centrifugal molding method, and the like, and the surface thereof may be polished as necessary.

  If the volume resistivity of the intermediate transfer belt 10 exceeds the above-described range, the bias required for transfer increases, which increases the power supply cost. Further, since the charging potential of the intermediate transfer belt 10 becomes high and the self-discharge becomes difficult in the transfer process, the transfer paper peeling process, etc., it is necessary to provide a static eliminating means. Also, if the volume resistivity and surface resistivity are below the above ranges, the charge potential decays faster, which is advantageous for static elimination by self-discharge, but toner scattering occurs because the current during transfer flows in the surface direction. Resulting in.

  Therefore, the volume resistivity and the surface resistivity of the intermediate transfer belt 10 according to the embodiment of the present invention must be within the above ranges. The volume resistivity and surface resistivity were measured by connecting an HRS probe (inner electrode diameter 5.9 mm, ring electrode inner diameter 11 mm) to a high resistivity meter (manufactured by Mitsubishi Chemical Corporation: Hiresta IP), and an intermediate transfer belt. The measured value 10 seconds after applying a voltage of 100 V (surface resistivity is 500 V) to the front and back of 10 was used.

  The belt cleaning unit 19 for cleaning the intermediate transfer belt 10 is provided with a cleaning blade 20 made of urethane rubber. The cleaning blade 20 is pressed against the intermediate transfer belt 10 to block the toner and clean it. ing.

The secondary transfer roller 21 covers a metal core such as SUS (Stainless Used Steel) with an elastic body such as urethane adjusted to a resistance value of 10 ⁶ to 10 ¹⁰ Ω by a conductive material. Is made up of. Here, since the current hardly flows when the resistance value of the secondary transfer roller 21 exceeds the above range, it is necessary to apply a higher voltage in order to obtain a required transfer property, which increases the power supply cost. Invite. In addition, since a high voltage is applied, a discharge occurs in the gap before and after the transfer portion nip, so that white spots are lost on the halftone image due to the discharge.

  On the contrary, if the resistance value of the secondary transfer roller 21 is below the above range, the transferability between the multi-color image portion (for example, three-color superimposed image) and the single-color image portion existing on the same image cannot be achieved. This is because the resistance value of the secondary transfer roller 21 is low, so that a sufficient current flows to transfer the monochrome image portion at a relatively low voltage. However, in order to transfer the multiple color image portion, it is optimal for the monochrome image portion. This is because a voltage value higher than the required voltage is required, and if the voltage is set to a voltage capable of transferring a plurality of color image portions, the transfer current becomes excessive in a single color image, resulting in a reduction in transfer efficiency.

  The resistance value of the secondary transfer roller 21 is measured by installing the secondary transfer roller 21 on a conductive metal plate and applying a load of 4.9 N on one side (total of 9.8 N on both sides) to both ends of the core metal. In this state, it was calculated from the value of the current flowing when a voltage of 1000 V was applied between the metal core and the metal plate. The secondary transfer is controlled by a constant current, and in this embodiment, the set value is set to −30 μA.

  The transfer paper 25, which is a recording medium, is synchronized with the timing at which the leading edge of the four-color superimposed image on the surface of the intermediate transfer belt 10 reaches the secondary transfer position by the paper feed roller 26, the transfer paper transport roller 27, and the registration roller 28. Are fed. The four-color superimposed image transferred to the transfer paper 25 is discharged by the discharging means as described above, then conveyed to the fixing means 30 along the fixing inlet guide 34, fixed by the fixing means 30, and then discharged from the discharge roller. The paper is discharged by 32.

  Next, the configuration of the transfer unit of the image forming apparatus according to the embodiment of the present invention will be described in detail. 2A and 2B are diagrams for explaining the transfer configuration of the first transfer unit that holds the primary transfer unit in the vertical direction of the transfer unit in the image forming apparatus according to the embodiment of the present invention, and FIG. 2B is the primary transfer unit. FIG. 3 is a diagram illustrating a transfer configuration of the image forming apparatus according to the embodiment of the present invention.

  In the full-color transfer device 300 shown in FIG. 3, only the black 11 d of the primary transfer bias roller 11 can be brought into contact with the photoconductor 1 in order to extend the life of the color photoconductor. . The primary transfer bias roller 11 is installed in a state where it is offset about 0.5 to 3 mm with respect to the photosensitive member 1 and downstream with respect to the conveyance direction of the intermediate transfer belt 10 indicated by the left arrow in FIG. Is done. The black primary transfer bias roller 11d is a spring 14 that is an extension member that can extend in a direction substantially perpendicular to the conveyance direction of the intermediate transfer belt 10 indicated by the left arrow in FIG. Supported by.

  When the transfer paper 25 enters the secondary transfer nip portion, a speed change occurs in the intermediate transfer belt 10 and the tension of the intermediate transfer belt 10 changes. At that time, as indicated by the downward arrow in FIG. 2A, the force 45a due to the tension fluctuation acts in a direction to reduce the pressurization of the primary transfer pressure.

  The primary transfer bias rollers 11a, 11b, and 11c except the black are rotatable about the support shaft in the clockwise direction or the counterclockwise direction of FIG. 2B, and the primary transfer bias rollers 11a, 11b, and It is held by a primary transfer bias roller holder 15 which is a holding member for holding 11c. The support shaft of the primary transfer bias roller holder 15 is upstream of the primary transfer bias rollers 11a to 11c with respect to the conveyance direction of the intermediate transfer belt 10 indicated by the left arrow in FIG. Installed.

  As shown in FIG. 2B, the primary transfer bias roller 11 has a speed fluctuation of the intermediate transfer belt 10 in addition to the force 45a due to the tension fluctuation of the intermediate transfer belt 10 shown by the downward arrow in FIG. The force 45b is received. Therefore, even if the speed fluctuation of the intermediate transfer belt 10 occurs during monochrome image formation and the force 45b is received, the force 45a due to the tension fluctuation of the intermediate transfer belt 10 indicated by the downward arrow in FIG. Therefore, it is possible to suppress fluctuations in the primary transfer pressure and reduce the occurrence of abnormal images.

  During full-color image formation, that is, when all the colors of the primary transfer bias rollers 11 a to 11 d are in contact with the photoreceptor 1, an electrostatic attracting force is generated between the intermediate transfer belt 10 and the photoreceptor 1. Therefore, the speed fluctuation of the intermediate transfer belt 10 hardly occurs.

  As described above, when the intermediate transfer belt 10 is used as the transfer member, it is possible to suppress the primary transfer fluctuation caused by the speed fluctuation of the transfer belt that occurs at the time of the secondary transfer entry, thereby reducing the occurrence of abnormal images. Can do.

  Next, the toner used in the image forming apparatus according to the embodiment of the present invention will be described. 4 and 5 are diagrams illustrating toners used in the image forming apparatus according to the embodiment of the present invention. The toner used in the embodiment of the present invention is a polymerized toner generated by a polymerization method.

  The shape factor SF1 of the toner used in the embodiment of the present invention is preferably in the range of 100 to 180, and the shape factor SF2 is preferably in the range of 100 to 180. 4 and 5 are diagrams schematically showing the shape of the toner in order to explain the shape factor SF1 and the shape factor SF2. The shape factor SF1 indicates the ratio of the roundness of the toner shape, and is represented by the following <Equation 1>.

That is, it is a value obtained by dividing the square of MXLNG, which is the maximum length of a shape formed by projecting toner onto a two-dimensional plane, by the figure area AREA and multiplying by 100π / 4.
<Formula 1> SF1 = {(MXLNG) ² / AREA} × (100π / 4)
When the value of SF1 is 100, the shape of the toner is a true sphere, and becomes larger as the value of SF1 increases.

The shape factor SF2 indicates the ratio of the unevenness of the toner shape, and is expressed by the following <Equation 2>. A value obtained by dividing the square of the perimeter PERI of the figure formed by projecting the toner onto the two-dimensional plane by the figure area AREA and multiplying by 100π / 4.
<Formula 2> SF2 = {(PERI) ² / AREA} × (100π / 4)
When the value of SF2 is 100, there is no unevenness on the toner surface, and as the SF2 value increases, the unevenness of the toner surface becomes more prominent.

  Specifically, the shape factor is measured by taking a photograph of the toner with a scanning electron microscope (S-800: manufactured by Hitachi, Ltd.), introducing it into an image analyzer (LUSEX 3: manufactured by Nireco) and analyzing it. Calculated. When the shape of the toner is close to a sphere, the contact state between the toner and the toner or the toner and the photoconductor becomes a point contact, so that the adsorbing force between the toners becomes weak and the fluidity increases, and the toner and the photoconductor The attraction force becomes weaker and the transfer rate becomes higher. If either of the shape factors SF1 and SF2 exceeds 180, the transfer rate is lowered, and the cleaning property when attached to the transfer unit is also not preferred.

  The toner particle size is preferably in the range of 4 to 10 μm in terms of volume average particle size. When the particle size is smaller than this, it becomes a cause of background stains during development, fluidity is deteriorated, and the particles are more likely to aggregate, so that voids are likely to occur. On the other hand, when the particle size is larger than this, a high-definition image cannot be obtained due to toner scattering or resolution deterioration. In this embodiment, a toner having a volume average particle diameter of 6.5 μm is used.

  Next, in the image forming apparatus according to the embodiment of the present invention, a specific example in which the image carrier is a transfer carrier will be described. FIG. 6 is a diagram illustrating a specific example in which an image carrier is a transfer carrier in the image forming apparatus according to the embodiment of the present invention.

  In FIG. 6, an image forming apparatus 600 includes a photoconductor 1, a photoconductor cleaning unit 2, a charger 4, an exposure unit 5, a transfer conveyance body (hereinafter referred to as a transfer conveyance belt) 18, and the like around the photoconductor 1. Is arranged. The developing unit includes four developing units, a yellow developing unit 6, a magenta developing unit 7, a cyan developing unit 8, and a black developing unit 9.

  When a full color image is formed, a visible image is formed in the order of the yellow developing unit 6, the magenta developing unit 7, the cyan developing unit 8, and the black developing unit 9, and the visible images of the respective colors are conveyed by the transfer conveying belt 18. A full-color image is formed by sequentially transferring images onto the transfer material 25. When the transfer material 25 enters the nip portion with the suction roller 17, transfer pressure fluctuations occur during image transfer of the preceding transfer material 25. Therefore, the transfer rollers 20a, 20b, and 20c are centered on the support shaft. The support shaft is held by a rotatable primary transfer bias roller holder 15, and the support shaft is disposed upstream of the transfer roller 20 in the transport direction of the transfer transport belt 18.

  As described above, when the transfer conveyance belt 18 is used as the transfer member, it is possible to suppress the transfer fluctuation pressure generated due to the speed fluctuation of the transfer conveyance belt that occurs when the registration roller is removed, thereby reducing the occurrence of abnormal images. Can do.

  As described above, according to the present invention, the monochrome primary transfer unit that is likely to cause shock jitter is supported by the intermediate transfer unit in the vertical direction, so that it is difficult to be affected by sudden speed fluctuations of the intermediate transfer unit. Further, the primary transfer means of the collar, on which shock jitter is unlikely to occur, is held by the transfer means holding means that can rotate around the support shaft, and the support shaft is located upstream of the image carrier and the primary transfer means in the transfer belt conveyance direction. By installing it on the side, the primary transfer pressure is stabilized. As a result, when the recording member enters the secondary transfer nip, even if the belt speed of the intermediate transfer means changes, the primary transfer pressure is kept constant with a simple structure and low cost, and the occurrence of abnormal images is suppressed. Thus, it is possible to obtain a transfer device and an image forming apparatus that can perform the transfer.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments thereof, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the invention as defined in the claims. is there.

1a, 1b, 1c, 1d photoconductor 2a, 2b, 2c, 2d photoconductor cleaning head 3a, 3b, 3c, 3d blade 4a, 4b, 4c, 4d charger 5a, 5b, 5c, 5d exposure means 6 yellow developing device 7 Magenta Developer 8 Cyan Developer 9 Black Developer 10 Intermediate Transfer Belts 11a, 11b, 11c, 11d Primary Transfer Bias Roller 12 Secondary Transfer Roller 13 Tension Roller 14 Spring 15 Primary Transfer Bias Roller Holder 18 Transfer Transport Belt 19 Belt Cleaning Unit 20 Cleaning blade 21 Secondary transfer roller 25 Transfer paper 26 Paper feed roller 27 Transfer paper transport roller 28 Registration roller 30 Fixing means 34 Fixing inlet guide 100, 600 Image forming apparatus 300 Transfer apparatus

JP 2010-113280 A

Claims (6)

An image carrying member carrying a toner image;
A transfer member on which the toner image carried on the image carrying member is formed by being conveyed in a predetermined direction and contacting the image carrying member;
An abutting member for abutting the transfer member against the image bearing member;
A transfer device provided with a plurality of transfer means including
The transfer means includes
First transfer means including an extension member that extends the contact member in a direction substantially perpendicular to the transfer direction of the transfer member;
A second transfer means that is provided on the downstream side with respect to the transfer direction of the transfer member, is rotatable about a support shaft, and includes a holding member that holds the contact member;
A transfer apparatus comprising:   The first transfer unit forms a monochrome toner image on the transfer member, and the second transfer unit forms a color toner image other than the monochrome on the transfer member. The transfer device according to claim 1.   The transfer apparatus according to claim 1, wherein the transfer unit includes a recording medium on which the toner image is transferred inserted between the image carrying member and the contact member. An image carrying member carrying a toner image;
A transfer member on which the toner image carried on the image carrying member is formed by being conveyed in a predetermined direction and contacting the image carrying member;
An abutting member for abutting the transfer member against the image bearing member;
An image forming apparatus having a transfer device provided with a plurality of transfer means including:
The transfer means includes
First transfer means including an extension member that extends the contact member in a direction substantially perpendicular to the transfer direction of the transfer member;
A second transfer means that is provided on the downstream side with respect to the transfer direction of the transfer member, is rotatable about a support shaft, and includes a holding member that holds the contact member;
An image forming apparatus comprising:   The first transfer unit forms a monochrome toner image on the transfer member, and the second transfer unit forms a color toner image other than the monochrome on the transfer member. The image forming apparatus according to claim 4.   The image forming apparatus according to claim 4, wherein the transfer unit includes a recording medium to which the toner image is transferred inserted between the image carrying member and the contact member.

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