JP2011253041A - Static elimination device, transfer device, and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a static elimination device capable of suppressing occurrence of image defects, a charging device, and an image formation device.SOLUTION: An image formation device 10 includes a static elimination device 320. The static elimination device 320 includes a static elimination member 322 which eliminates static of a sheet to which a toner is transferred, a first member 330 which supports the static elimination member 322, and a second member 350 which is fixed to the first member 330, is made of a material whose triboelectric series with respect to the toner to be transferred to the sheet is closer than the first member 330, and has a rib 353 for guiding the sheet whose static is eliminated by the static elimination member 322.

Description

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

  In Patent Document 1, a transfer electric field is formed between a recording material passing through a transfer nip formed between an image carrier and a transfer member and the image carrier, and a toner image on the image carrier is transferred. In the static eliminator for neutralizing the recording material back surface immediately after being transferred to the surface of the recording material, it has a plurality of protrusions in the longitudinal direction so that the longitudinal direction coincides with the direction orthogonal to the recording material conveyance direction. A long conductive static elimination member disposed close to the recording material back surface portion, and a rib protruding toward the recording material back surface portion side from the plurality of protrusions, and the rib is being conveyed. There is disclosed a static eliminator formed such that the outer shape when viewed from the longitudinal direction of the static eliminator at a position where the back surface of the recording material can come into contact is a curved shape.

JP 2007-3575 A

  An object of the present invention is to provide a static eliminator, a charging device, and an image forming apparatus that can suppress the occurrence of image defects.

  According to a first aspect of the present invention, there is provided a static elimination member that neutralizes a recording medium to which a developer has been transferred, a first member that supports the static elimination member, and a first member that is fixed to the first member and transferred to the recording medium. And a second member having a guide portion for guiding a recording medium to be neutralized by the neutralizing member. .

  According to a second aspect of the present invention, a meshing portion is formed in the first member, a meshed portion that meshes with the meshing portion is formed in the second member, and the second member is connected to the meshing portion. The static eliminator according to claim 1, wherein the static elimination device is fixed to the second member by meshing with the meshed portion.

  The present invention according to claim 3 is the static eliminator according to claim 1 or 2, wherein the static eliminator is disposed between the first member and the second member.

  According to a fourth aspect of the present invention, there is provided a static elimination member that neutralizes a recording medium to which a developer has been transferred, and a first member that is formed with a first guide portion that guides a recording medium that is neutralized by the static elimination member. The second member that is fixed to the first member and is formed of a material having a charging series for the developer transferred to the recording medium closer to that of the first member and guides the recording medium to be discharged by the discharging member. And a second member having a guide portion formed thereon.

  According to a fifth aspect of the present invention, in the static eliminator according to the fourth aspect, the first guide portion protrudes from the second guide portion toward the recording medium side on the upstream side in the conveyance direction of the recording medium. .

  According to a sixth aspect of the present invention, there is provided the static eliminator according to the fourth or fifth aspect, wherein the second guide portion protrudes toward the recording medium side from the first guide portion on the downstream side in the conveyance direction of the recording medium. It is.

  According to a seventh aspect of the present invention, the static eliminator is positioned between the first guide portion and the second guide portion in a direction crossing the conveyance direction of the recording medium, and is exposed to the recording medium. The static eliminator according to claim 4, wherein the static eliminator has protrusions formed to face each other.

  According to an eighth aspect of the present invention, there is provided a transfer member that transfers a developer onto a recording medium, a static elimination member that neutralizes a recording medium onto which the developer has been transferred by the transfer member, and the transfer member and the static elimination member. A first member and a charging series for a developer fixed to the first member and transferred to a recording medium by the transfer member are formed from a material closer to the first member, and are discharged by the charge eliminating member. And a second member on which a guide portion for guiding the recording medium is formed.

  According to a ninth aspect of the present invention, there is provided a transfer member that transfers a developer to a recording medium, a static elimination member that neutralizes a recording medium onto which the developer has been transferred by the transfer member, and the transfer member and the static elimination member. A first member formed with a first guide for guiding a recording medium to be discharged by the discharging member, and a developer fixed to the first member and transferred to the recording medium by the transfer member. And a second member having a second guide portion formed of a material whose charging series is closer than that of the first member and guiding a recording medium to be neutralized by the neutralizing member.

  According to a tenth aspect of the present invention, there is provided an image carrier, a transfer member that transfers the developer held by the image carrier to a recording medium, and a charge removal member that neutralizes the recording medium onto which the developer has been transferred by the transfer member. And a first member that supports the transfer member and the charge removal member, and a charging series for the developer that is fixed to the first member and is transferred to the recording medium by the transfer member, as compared to the first member. And a second member formed with a guide portion that guides a recording medium that is formed of a close material and is discharged by the charge removal member.

  According to an eleventh aspect of the present invention, there is provided an image carrier, a transfer member that transfers the developer held by the image carrier to a recording medium, and a charge removal member that neutralizes the recording medium onto which the developer has been transferred by the transfer member. A first member that supports the transfer member and the charge removal member and that has a first guide portion that guides a recording medium to be discharged by the charge removal member, and is fixed to the first member, A charging system for the developer transferred to the recording medium by the transfer member is formed of a material closer to that of the first member, and a second guide portion for guiding the recording medium to be discharged by the discharging member is formed. And an image forming apparatus having two members.

  According to the first aspect of the present invention, it is possible to provide a static eliminator capable of suppressing image defects.

  According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the second member can be prevented from being bent as compared with the case without the present configuration. The static eliminator which can be provided.

  According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the neutralization member can be positioned with a simple structure as compared with the case without the present structure. It is possible to provide a static eliminator capable of performing

  According to the fourth aspect of the present invention, it is possible to provide a static eliminator capable of suppressing image defects.

  According to the fifth aspect of the present invention, in addition to the effects of the fourth aspect of the present invention, it is possible to make it difficult to cause a conveyance failure of the recording medium as compared with the case without the present configuration. A static eliminator can be provided.

  According to the present invention of claim 6, in addition to the effects of the present invention of claim 4 or 5, it is possible to provide a static eliminator capable of suppressing frictional charging with the recording medium. .

  According to the present invention of claim 7, in addition to the effects of the present invention of any one of claims 4 to 6, it is possible to improve the static elimination efficiency as compared with the case without this configuration. A static eliminator can be provided.

  According to the eighth aspect of the present invention, it is possible to provide a transfer device capable of suppressing image defects.

  According to the present invention of claim 9, it is possible to provide a transfer device capable of suppressing image defects.

  According to the tenth aspect of the present invention, an image forming apparatus capable of suppressing image defects can be provided.

  According to the eleventh aspect of the present invention, an image forming apparatus capable of suppressing image defects can be provided.

1 is a right side view illustrating an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a right side view illustrating a transfer device and a charge removal device included in the image forming apparatus illustrated in FIG. 1. It is a top view which shows the static elimination member which the static elimination apparatus shown in FIG. 2 has. It is a top view which shows the 1st member which the static elimination apparatus shown in FIG. 2 has. It is sectional drawing which shows the 1st member shown in FIG. 4, and shows the AA line cross section in FIG. It is a top view which shows the 2nd member which the static elimination apparatus shown in FIG. 2 has. 6 shows the second member shown in FIG. 6, FIG. 6A is a cross-sectional view showing a cross section taken along line BB in FIG. 6, and FIG. 6B is a cross-sectional view showing a cross section taken along line CC in FIG. It is. It is a top view which shows the static elimination apparatus shown in FIG. 2 shows the static eliminator shown in FIG. 2, in which FIG. 9A is a cross-sectional view for explaining how the second member is attached to the first member, and FIG. It is sectional drawing which shows the state with which this member was mounted | worn and shows the DD sectional view in FIG. It is a perspective view which shows typically arrangement | positioning with the 1st rib and 2nd rib which the static elimination apparatus shown in FIG. 2 has. FIG. 11A illustrates a state in which the sheet passes through the vicinity of the static eliminator illustrated in FIG. 2, and FIG. 11A illustrates a state in which the leading end of the sheet has reached the first guide unit. FIG. 4 is a diagram for explaining a state in which a leading end portion of a sheet has passed through a charge removal member. It is sectional drawing which shows the static elimination apparatus which concerns on a 1st comparative example. It is sectional drawing which shows the static elimination apparatus which concerns on a 2nd comparative example.

Next, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 shows an image forming apparatus 10 according to an embodiment of the present invention. As shown in FIG. 1, the image forming apparatus 10 includes an image forming apparatus main body 20, and the upper part of the image forming apparatus main body 20 is used as a discharge unit 22 that discharges a sheet on which an image is formed. .

  In the image forming apparatus main body 20, an image forming unit 100 and a paper feeding device 200 that supplies paper to the image forming unit 100 are mounted. In addition, a conveyance path 250 is formed in the image forming apparatus main body 20 for conveying a sheet used as a recording medium.

  The image forming unit 100 includes photosensitive drums 102Y, 102M, 102C, and 102K, charging devices 104Y, 104M, 104C, and 104K that charge the photosensitive drums 102Y, 102M, 102C, and 102K, and charging devices 104Y, 104M, and 104C, respectively. , 104K charged with the photosensitive drums 102Y, 102M, 102C, 102K to form an electrostatic latent image by irradiating light onto the photosensitive drums 102Y, 102M, 102C, 102K, and the latent image forming device 106 to the photosensitive drums 102Y, 102M, 102C. , The electrostatic latent image formed on the surface of 102K is developed using toner and carrier development, and each of yellow toner image, magenta toner image, cyan toner image, and black toner image is developed. Development devices 110Y, 110M, 110C, and 110K to be formed.

  A yellow toner, a magenta toner, a cyan toner, and a black toner are used as a developer. For example, a toner mainly composed of polystyrene is used.

  Further, the image forming unit 100 transfers the yellow toner image, the magenta toner image, the cyan toner image, and the black toner image formed by the developing devices 110Y, 110M, 110C, and 110K, respectively, to an intermediate transfer body 142 described later. A primary transfer device 140 that performs cleaning, and cleaning devices 114Y, 114M, 114C, and 114K that clean the surfaces of the photosensitive drums 102Y, 102M, 102C, and 102K.

  The primary transfer device 140 transfers a yellow toner image, a magenta toner image, a cyan toner image, and a black toner image formed on the photosensitive drums 102Y, 102M, 102C, and 102K so as to be superimposed, and is used as an image holding member. A belt-like intermediate transfer member 142. The intermediate transfer body 142 is supported by the support rolls 146, 148, 150, and 152 so that it can rotate.

  Further, the primary transfer device 140 uses, as an intermediate transfer body, a yellow toner image, a magenta toner image, a cyan toner image, and a black toner image, which are respectively formed on the photosensitive drums 102Y, 102M, 102C, and 102K. Next transfer rolls 156Y, 156M, 156C, and 156K to which a transfer bias for transferring is applied are included.

  Further, the image forming unit 100 transfers the yellow toner image, the magenta toner image, the cyan toner image, and the black toner image transferred to the intermediate transfer body 142 to a sheet, and is used as a transfer device. A transfer device 300 is included. The secondary transfer device 300 includes a secondary transfer roll 310 that is used as a transfer member that transfers a developer onto a sheet. Details of the secondary transfer apparatus 300 will be described later.

  Further, the image forming unit 100 includes a fixing device 116 that fixes the toner image transferred by the secondary transfer device 300 to a sheet.

  The paper feeder 200 includes a paper storage unit 202, an extraction roll 204 that extracts the uppermost paper stored in the paper storage unit 202, and a paper extracted by the extraction roll 204 toward the image forming unit 100. A conveyance roll 206 that conveys the sheet and a separation roll 208 that contacts the conveyance roll 206 and separates the paper from the conveyance roll 206 are provided.

  The conveyance path 250 includes a main conveyance path 252, a reverse conveyance path 254, and an auxiliary conveyance path 256. The main conveyance path 252 is a conveyance path that conveys the paper supplied from the paper feeding device 200 toward the discharge unit 22. The main conveyance path 252 and the registration roll 260 are sequentially arranged along the main conveyance path 252 from the upstream side in the conveyance direction of the paper. The secondary transfer device 300 described above, the fixing device 116 described above, and the discharge roll 262 are mounted. The registration roll 260 starts rotating at a predetermined timing from the stopped state, and a contact portion between the intermediate transfer body 142 and the secondary transfer roll 310 so as to coincide with the timing at which the toner image is transferred to the intermediate transfer body 142. The paper is supplied to N.

  The discharge roller 126 discharges the sheet on which the toner image is fixed by the fixing device 116 to the discharge unit 22. Further, the discharge roll 126 rotates in the opposite direction to the case of discharging the paper to the discharge unit 22 when forming images on both sides of the paper, and removes the paper on which the image is formed on one side. The paper is supplied from the end side to the reverse conveyance path 254.

  The reverse conveyance path 254 is used when a sheet on which an image is formed on one side is supplied again to the upstream side of the registration roll 260 while being reversed. For example, two reverse conveyance rolls 264 and 264 are mounted along the reverse conveyance path 254.

  The auxiliary conveyance path 256 is a conveyance path used when paper is supplied from the front side of the image forming apparatus main body 20. An auxiliary conveyance roll 266 that conveys the sheet toward the registration roll 260 and a separation roll 268 that contacts the auxiliary conveyance roll 266 and is used to separate the sheet are mounted along the auxiliary conveyance path 256.

FIG. 2 shows a secondary transfer device 300.
As shown in FIG. 2, the secondary transfer device 300 includes the above-described secondary transfer roll 310 and the charge removal device 320. The secondary transfer roll 310 contacts the support roll 150 via the intermediate transfer belt 142 and forms the contact portion N between the secondary transfer roll 310 and the intermediate transfer belt 142 as described above. A transfer bias is applied to the secondary transfer roll 310 or the support roll 150 by a bias applying device (not shown). Further, the secondary transfer roll 310 rotates in the direction of the arrow shown in FIG. 2 and is charged by the intermediate transfer belt 142 held by the sheet conveyed from below along the main conveyance path 252 and reaching the contact portion N. The developer in the state is moved so as to be drawn. In this embodiment, the secondary transfer device 300 and the static eliminator 320 are integrated, but the secondary transfer device 300 and the static eliminator 320 may be configured separately.

  The neutralization device 320 includes a neutralization member 322 that neutralizes the sheet on which the toner has been transferred, a first member 330 that supports the neutralization member 322, and a second member 350 that is fixed to the first member. The second member 350 has a function of protecting the charge removal member 322.

  FIG. 3 shows the charge removal member 322. The static elimination member 322 is a conductive member such as a metal such as SUS301, and is processed so that a plurality of protrusions 324 shaped like a saw tooth are formed on one of the long sides of the plate-like member. Has been. The distance between the tips of adjacent protrusions 324 is constant, for example 4 mm. The protrusion 324 is used as a facing portion that faces the sheet. The static elimination member 322 may be directly grounded, or may be grounded or a bias may be applied via a resistor.

  4 and 5 show the first member 330. As shown in FIGS. 4 and 5, the first member 330 supports the static elimination member 322 from the lower side in the gravity direction on the upper surface 332. In addition, the first member 330 supports the secondary transfer roll 310 so that it can rotate on the left side wall part 334 (upper side in FIG. 4) and the right side wall part (not shown).

  In addition, the first member 330 is formed with a plurality of ribs 336 so as to protrude from the upper surface 332. The ribs 336 are used as a first guide portion that guides a sheet to be neutralized by the neutralizing member 322, and are arranged at a predetermined interval. The interval between the ribs 336 is determined so that two protrusions 324 of the static elimination member 322 are arranged between the adjacent ribs 336. A concave portion 338 is formed in each rib 336. The concave portion 338 is used as a meshing portion. Further, the end portion 340 on the opposite side to the side where the secondary transfer roll 310 is disposed of the first member 330 is also used as a meshing portion, similarly to the concave portion 338.

The first member 330 is made of ABS (Acrylonitrile butadiene styrene) resin. The tensile strength of the ABS resin is 39 (N / mm ² ).

  6 and 7 show the second member 350. A plurality of ribs 352 are formed on the second member 350 so as to protrude upward. The ribs 352 are arranged at a predetermined interval and are used as a guide unit that guides a sheet to be neutralized by the neutralization member 322, and as a second guide unit that guides the sheet to be neutralized by the neutralization member 322. It is used. Further, an end portion 356 that is a long side portion of the second member 350 on the main conveyance path 252 side is used as a meshed portion, and a concave portion 338 formed in the rib 336 of the first member 330 (see FIG. 5). ).

  Further, the long side portion opposite to the end portion 356 of the second member 350 has a shape that is bent downward and further bent to the rear side (right side in FIG. 7), and a concave portion 354 is formed by the bending. ing. The concave portion 354 is used as a portion to be engaged, and engages with the end portion 340 of the first member 330.

The second member 350 is made of polypropylene. The tensile strength of polypropylene is 30 (N / mm ² ).

  Here, polystyrene which is a main component of yellow toner, magenta toner, cyan toner and black toner, ABS resin which is a material of the first member 330, and polypropylene which is a material of the second member 350. As for the charge series relationship, the charge series of polypropylene is closer to that of polystyrene than the ABS resin. That is, the second member 350 is formed of a material whose charging series is closer to that of the first member 330 with respect to the toner transferred to the paper.

  The charging series is an ordered table in which materials that are easily charged on the + side are placed on the upper side and materials that are easily charged on the-side are placed on the lower side when two types of materials are rubbed. The more distant the series, the more charge moves. That is, when two substances are charged by contact or friction, one of them is charged positively and the other is charged negatively, but whether a specific substance is charged positively or negatively is not necessarily constant. Whether to charge on the + side or on the-side is determined by the combination with the substance that comes into contact with the material. A charging series is a series in which those that are easily charged on the negative side are arranged on the lower side.

Further, as described above, the tensile strength of the ABS resin that is the material of the first member 330 is 39 (N / mm ² ), and the polypropylene tensile strength that is the material of the second member 350 is 12 (N / mm). ² ), and the first member 330 is formed of a material having a higher tensile strength than the second member 350. In general, the ABS resin that is the material of the first member 330 is less expensive than the polypropylene that is the material of the second member 350.

  8 and 9 show the static eliminator 320. FIG. As shown in FIG. 9A, the second member 350 has an end portion 356 engaged with a recess 338 formed in the rib 336 of the first member 330, and the recess 354 has an end portion of the first member 330. It is fixed to the first member 330 so as to mesh with 340. The second member 350 is fixed to the first member 330 at a plurality of positions in the longitudinal direction by the end portion 356 meshing with the first member 330, and the concave portion 354 is meshed with the first member 330. It is fixed to the first member 330 continuously in the longitudinal direction. For this reason, for example, even if the second member 350 is formed from a soft material such as a low tensile strength, the second member 350 is difficult to bend. In addition, it is difficult for the second member 350 to be bent and a sheet conveyance failure to occur due to the leading end of the sheet being caught by the bent second member 350.

  When the second member 350 is fixed to the first member 330, the charge removal member 322 is disposed between the first member 330 and the second member 350, as shown in FIG. 9B. Thus, the first member 330 and the second member 350 are sandwiched between the first member 330 and the second member 350 in the vertical direction and in the direction in which the sheet is conveyed.

  Further, when the second member 350 is fixed to the first member 330, the longitudinal direction of the secondary transfer roll 310, the first member 330, and the second member 350, as shown in FIG. Thus, the ribs 336 and the ribs 352 are arranged in a direction crossing the direction in which the sheet is conveyed. Further, the protrusion 324 of the charge removal member 322 is disposed in a space formed between the rib 336 and the rib 352 adjacent to each other. That is, the protrusion 324 is located between the first member 330 and the second member 350 and is in a state of facing the paper in an exposed state.

  FIG. 10 schematically shows the arrangement of the ribs 336 and the ribs 352. As shown in FIG. 10, the rib 336 used as the first guide part conveys the paper upstream of the rib 352 used as the second guide part in the paper conveyance direction. Projecting to the main conveyance path 252 side. Further, the rib 352 used as the second guide portion protrudes toward the main transport path 252 for transporting the paper on the downstream side in the paper transport direction. That is, the rib 352 is higher in height in the direction intersecting with the sheet conveyance direction indicated by the arrow in FIG. 10 than the rib 336 used as the first guide portion. More specifically, the height h1 of the rib 352 is higher than the height h2 of the rib 336.

  FIG. 11 shows a state in which the sheet passes near the static eliminator 320. The sheet S normally does not contact the rib 336 but contacts the rib 352 and is guided to the rib 352 as shown in FIG.

  Depending on the behavior of the sheet S, the leading end S1 of the sheet S may reach the rear end (right side in FIG. 11) of the first member 330, as shown in FIG. In this case, the paper S contacts the rib 336 and is guided to the rib 336. When the paper is transported downstream from the state shown in FIG. 11A, the rib 352 protrudes further to the paper side than the rib 336 on the downstream side in the paper transport direction. As described above, the sheet immediately comes into contact with the rib 336 and is separated from the rib 336. For this reason, only a small portion of the paper S on the side of the leading end S 1, where only the toner is not normally transferred, contacts the rib 336, and the other portion of the paper S contacts the rib 352. That is, the leading edge of the sheet S contacts the rib 336 whose charging series is farther than the rib 352 with respect to the toner, but most other sheets of the sheet S are on the rib 352 whose charging series is closer to the rib 336 than the toner. Contact.

  In the state where the sheet S shown in FIG. 11B is guided by the rib 352, the sheet S and the rib 352 are charged by friction because they are in contact with the rib 352 and the moving sheet S being conveyed. . At this time, the second member 350 including the ribs 352 is formed of a material whose charging series for the toner transferred to the paper is closer than that of the first member 330, and thus the rib 352 and the paper S are charged. The toner transferred onto the sheet is less likely to be scattered, and the toner transferred onto the sheet is not easily attracted to the sheet due to the charging of the ribs 352 and the sheet S.

  More specifically, the polypropylene that is the material of the second member 350 has the same polarity as the charged series of polystyrene, which is the main component of the toner, and the charge amount when frictionally charged shows a value close to that of the toner. By the frictional charging between the paper and the second member 350, the second member 350 is negatively charged and the paper is positively charged. At this time, the positive charge of the paper is equal to or less than the negative charge of the toner. For this reason, it is difficult for the toner transferred to the paper to be strongly attracted to the paper side or to be scattered.

  As described above, in the embodiment of the present invention, a toner mainly composed of polystyrene is used, ABS resin is used as the material of the first member 330, and polypropylene is used as the material of the second member 350. However, if the second member 350 is formed of a material whose charge series for the toner transferred to the paper is closer than that of the first member 330, the toner is replaced with a toner mainly composed of polystyrene. A toner mainly composed of a material may be used, a material other than ABS resin may be used as the material of the first member 330, and a material other than polypropylene may be used as the material of the second member 350. For example, in place of toner mainly composed of polystyrene, homopolymers or copolymers such as styrenes, monoolefins, vinyl esters, α-methylene aliphatic monocarboxylic acid esters, vinyl ethers, vinyl ketones, etc. A toner having a main component can be used. More specifically, styrene-alkyl acrylate copolymer, styrene-alkyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene- A toner mainly composed of maleic anhydride copolymer, polyethylene, polyester resin, polypropylene, or the like may be used. As a material of the first member 330, polyimide resin, polyamideimide resin, fluorine resin, vinyl chloride is used. Vinyl acetate copolymer, polycarbonate resin, polyethylene Terephthalate resin, vinyl chloride resin, ABS resin, polymethyl methacrylate resin, polybutylene terephthalate resin, etc. may be used, and as the material of the second member 350, polyimide resin, polyamideimide resin, fluorine resin, chloride Vinyl vinyl acetate copolymer, polycarbonate resin, polyethylene terephthalate resin, vinyl chloride resin, ABS resin, polymethyl methacrylate resin, polybutylene terephthalate resin, and the like may be used.

  FIG. 12 shows a secondary transfer device 300 and a charge removal device 320 according to a first comparative example. In the embodiment of the present invention, the first member 330 is made of ABS resin, and the second member 350 is made of polypropylene. On the other hand, in the first modification, the first member 330 and the second member 350 are integrated, and the entire first member 330 and second member 350 are integrated. Is made of polypropylene. For this reason, compared with the secondary transfer apparatus 300 and the static elimination apparatus 320 which concern on embodiment of this invention, intensity | strength is weak and it is easy to deform | transform because it is soft.

  FIG. 13 shows a secondary transfer device 300 and a charge removal device 320 according to a second comparative example of the present invention. In the embodiment of the present invention, the rib 336 protrudes toward the main conveyance path 252 (see FIG. 2) from the rib 352 on the upstream side in the sheet conveyance direction. On the other hand, in this modification, the rib 336 does not protrude from the rib 352 toward the main conveyance path 252 on the upstream side in the sheet conveyance direction. For this reason, in the second modification, the leading edge of the sheet is easily caught at a position between the rib 352 and the surface 332 as compared with the secondary transfer device 300 and the charge removal device 320 according to the embodiment of the present invention. , Paper conveyance failure tends to occur.

  As described above, the present invention can be applied to a static eliminator, a transfer device, and an image forming apparatus.

DESCRIPTION OF SYMBOLS 10 ... Image forming apparatus 142 ... Intermediate transfer belt 300 ... Secondary transfer apparatus 310 ... Secondary transfer roll 320 ... Static elimination apparatus 322 ... Static elimination member 324 ... Projection 330 ... First member 336 ... rib 338 ... recess 340 ... end 350 ... second member 352 ... rib 354 ... recess 356 ... end

Claims (11)

A static elimination member that neutralizes the recording medium to which the developer has been transferred;
A first member that supports the static elimination member;
A guide unit is formed that is fixed to the first member and is formed of a material that has a charging series for the developer transferred to the recording medium closer to that of the first member, and that guides the recording medium to be discharged by the discharging member. A second member formed;
A static eliminator. A meshing part is formed on the first member, and a meshed part meshing with the meshing part is formed on the second member,
The static eliminator according to claim 1, wherein the second member is fixed to the second member by meshing the meshing portion and the meshed portion.   The static elimination apparatus according to claim 1 or 2, wherein the static elimination member is disposed between the first member and the second member. A static elimination member that neutralizes the recording medium to which the developer has been transferred;
A first member formed with a first guide portion for guiding a recording medium to be neutralized by the neutralizing member;
A second guide that guides the recording medium that is fixed to the first member and formed of a material having a charge series for the developer transferred to the recording medium closer to that of the first member and that is neutralized by the neutralizing member. A second member having a portion formed thereon;
A static eliminator.   5. The static eliminator according to claim 4, wherein the first guide part protrudes toward the recording medium from the second guide part on the upstream side in the conveyance direction of the recording medium.   6. The static eliminator according to claim 4, wherein the second guide portion protrudes toward the recording medium from the first guide portion on the downstream side in the conveyance direction of the recording medium.   The charge removal member is positioned between the first guide portion and the second guide portion in a direction intersecting the recording medium conveyance direction, and has a protrusion formed so as to face the recording medium in an exposed state. The static eliminator according to any one of claims 4 to 6. A transfer member for transferring the developer to the recording medium;
A static elimination member that neutralizes the recording medium onto which the developer has been transferred by the transfer member;
A first member that supports the transfer member and the charge removal member;
The recording medium fixed to the first member and formed of a material whose charging series for the developer transferred to the recording medium by the transfer member is closer than that of the first member, guides the recording medium to be neutralized by the neutralizing member. A second member having a guide formed thereon;
A transfer device having A transfer member for transferring the developer to a recording medium;
A static elimination member that neutralizes the recording medium onto which the developer has been transferred by the transfer member;
A first member formed with a first guide portion for supporting the transfer member and the charge removal member and guiding a recording medium to be discharged by the charge removal member;
The recording medium fixed to the first member and formed of a material whose charging series for the developer transferred to the recording medium by the transfer member is closer than that of the first member, guides the recording medium to be neutralized by the neutralizing member. A second member having a second guide portion formed thereon;
A transfer device having An image carrier,
A transfer member for transferring the developer held by the image carrier to a recording medium;
A static elimination member that neutralizes the recording medium onto which the developer has been transferred by the transfer member;
A first member that supports the transfer member and the charge removal member;
The recording medium fixed to the first member and formed of a material whose charging series for the developer transferred to the recording medium by the transfer member is closer than that of the first member, guides the recording medium to be neutralized by the neutralizing member. A second member having a guide formed thereon;
An image forming apparatus. An image carrier,
A transfer member for transferring the developer held by the image carrier to a recording medium;
A static elimination member that neutralizes the recording medium onto which the developer has been transferred by the transfer member;
A first member formed with a first guide portion for supporting the transfer member and the charge removal member and guiding a recording medium to be discharged by the charge removal member;
The recording medium fixed to the first member and formed of a material whose charging series for the developer transferred to the recording medium by the transfer member is closer than that of the first member, guides the recording medium to be neutralized by the neutralizing member. A second member having a second guide portion formed thereon;
An image forming apparatus.

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