JP2006069768A - Image forming device - Google Patents

Image forming device Download PDF

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JP2006069768A
JP2006069768A JP2004257501A JP2004257501A JP2006069768A JP 2006069768 A JP2006069768 A JP 2006069768A JP 2004257501 A JP2004257501 A JP 2004257501A JP 2004257501 A JP2004257501 A JP 2004257501A JP 2006069768 A JP2006069768 A JP 2006069768A
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image forming
forming apparatus
guide
roller pair
transfer
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Kunihiro Oyama
邦啓 大山
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Ricoh Co Ltd
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Ricoh Co Ltd
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  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device, capable of preventing generation of a contaminated image at a rear end of transfer material with high stiffness by eliminating impact to a pre-transfer guide after passing a register roller nip. <P>SOLUTION: This image forming device comprises a carrying roller pair to carry recording paper 34, and a carrying guide 31 downstream of the carrying roller pair 10 in the carrying direction to carry the recording paper 34. An elastic member 33 for guiding the recording paper 34 from the carrying roller pair 10 to the carrying guide 31 is provided in between rollers 10a and 10b in the carrying roller pair 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、粉砕トナー、もしくは重合トナーを用いる複写機、ファクシミリ、プリンタ等の画像形成装置に関するものである。   The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, or a printer using pulverized toner or polymerized toner.

従来、画像形成装置では、像担持体を第２象限、現像手段を第３象限、転写手段を第１象限、レジストローラ対を第４象限に配置することが知られている（例えば、特許文献１および２参照）。
図８は従来の画像形成装置における各部材の配置を説明する概略図である。図８に示すように、画像形成装置は像担持体２を第２象限、現像手段４を第３象限、転写手段５を第１象限、レジストローラ対１０を第４象限に配置している。レジストローラのニップ部を通過した転写材（記録紙）の後端が現像手段４側の転写前ガイドに当接する。
とくに腰の強い転写材では、転写材後端が転写前ガイドに当接した際の衝撃によって転写前ガイドの裏すなわち転写前ガイドの現像ローラ側に溜まったトナーや紙粉が飛散して感光体（像担持体）２に付着し、それが転写材に転写されることで後端汚れという異常画像が発生してしまう。
特許文献１は、その実施例からすると、画像形成装置（電子写真記録装置）に着脱可能なカートリッジ側の転写前ガイドを可動形状にし、転写材がレジストローラ対を抜けたときのショックを低減する構成を開示している。しかしカートリッジはトナーエンド若しくは、感光体の寿命がくると交換するものである。
特許文献２では、その実施例においてレジスト駆動ローラ（ゴムローラ）の外径を一部細くしている。実施例のレイアウトでは転写材が搬送経路上に押し付けられるローラ（レジスト駆動ローラ）の外径の一部が小径になっている。
しかしながら、この構成では、普通紙をプリントする場合、レジスト駆動ローラ側に押し付けられるとその小径になっている部分が波打ち、転写不良やシワが発生し易くなる。
特開平１０−６９１７０号公報 特開平１０−２３２５６７号公報 2. Description of the Related Art Conventionally, in an image forming apparatus, it is known to place an image carrier in the second quadrant, a developing unit in the third quadrant, a transfer unit in the first quadrant, and a registration roller pair in the fourth quadrant (for example, Patent Documents). 1 and 2).
FIG. 8 is a schematic view for explaining the arrangement of each member in a conventional image forming apparatus. As shown in FIG. 8, in the image forming apparatus, the image carrier 2 is arranged in the second quadrant, the developing means 4 is arranged in the third quadrant, the transfer means 5 is arranged in the first quadrant, and the registration roller pair 10 is arranged in the fourth quadrant. The rear end of the transfer material (recording paper) that has passed through the nip portion of the registration roller comes into contact with the pre-transfer guide on the developing means 4 side.
For transfer materials that are particularly stiff, the toner and paper dust that accumulates on the back of the pre-transfer guide, that is, on the developing roller side of the pre-transfer guide, is scattered by the impact when the rear end of the transfer material contacts the pre-transfer guide. An abnormal image such as rear end contamination occurs due to adhesion to (image carrier) 2 and transfer of the image onto the transfer material.
According to Japanese Patent Application Laid-Open No. 2004-133620, the pre-transfer guide on the cartridge side that can be attached to and detached from the image forming apparatus (electrophotographic recording apparatus) has a movable shape to reduce shock when the transfer material passes through the registration roller pair. The configuration is disclosed. However, the cartridge is replaced when the toner end or the life of the photosensitive member comes to an end.
In Patent Document 2, in the embodiment, the outer diameter of the resist driving roller (rubber roller) is partially reduced. In the layout of the embodiment, a part of the outer diameter of the roller (registration drive roller) on which the transfer material is pressed onto the conveyance path is small.
However, with this configuration, when printing on plain paper, when pressed against the resist drive roller side, the portion with the small diameter is undulated, and transfer defects and wrinkles are likely to occur.
Japanese Patent Laid-Open No. 10-69170 Japanese Patent Laid-Open No. 10-232567

また、転写前ガイドは画像チリの発生を防ぐため、またはコスト面から、金属ではなく樹脂部品である場合が殆どである。樹脂部品では、金属より強度アップが困難なため、腰の強い転写材の後端が転写前ガイドに当接するとショックを受け振動し易い。転写前ガイドの長手方向で考えると中央部がもっとも弱い。
そこで、本発明の目的は、上述した実情を考慮して、腰の強い転写材後端のレジストローラニップ通過後の転写前ガイドへ与える衝撃をなくすことによって、後端汚れ画像の発生を防ぐ画像形成装置を提供することにある。 Further, the guide before transfer is mostly a resin part instead of a metal in order to prevent the generation of image dust or from the viewpoint of cost. In resin parts, it is difficult to increase the strength compared to metal. Therefore, if the rear end of a transfer material having a strong back comes into contact with the pre-transfer guide, it is easily shocked and vibrated. When considered in the longitudinal direction of the pre-transfer guide, the center is weakest.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the occurrence of a trailing edge smear image by eliminating the impact applied to the pre-transfer guide after passing through the registration roller nip at the trailing edge of the transfer material having a strong stiffness in consideration of the above situation. It is to provide a forming apparatus.

上記の課題を解決するために、請求項１に記載の発明は、記録紙を搬送する１対の搬送ローラ対と、この搬送ローラ対よりも搬送方向下流にあり、記録紙を案内する搬送ガイドとを有する画像形成装置において、前記搬送ローラ対のローラ間には、前記搬送ローラ対のニップ部を通過する記録紙の後端部を前記搬送ガイド側へ押圧する弾性部材が設けられていることを特徴とする。
また、請求項２に記載の発明は、前記搬送ローラ対の一方のローラ外径が小径であり、この小径部に前記弾性部材が配置されている請求項１記載の画像形成装置を特徴とする。
また、請求項３に記載の発明は、前記弾性部材が記録紙幅方向の中央近傍に配置されている請求項１または２記載の画像形成装置を特徴とする。
また、請求項４に記載の発明は、前記弾性部材が、厚さ０．１〜０．５ｍｍのＰＥＴ部材である請求項１ないし３のいずれか一項記載の画像形成装置を特徴とする。 In order to solve the above problems, the invention described in claim 1 is a pair of transport rollers for transporting recording paper, and a transport guide for guiding the recording paper, which is downstream of the transport roller pair in the transport direction. And an elastic member that presses a rear end portion of the recording paper passing through the nip portion of the conveyance roller pair toward the conveyance guide between the rollers of the conveyance roller pair. It is characterized by.
According to a second aspect of the present invention, there is provided the image forming apparatus according to the first aspect, wherein an outer diameter of one roller of the conveying roller pair is a small diameter, and the elastic member is disposed in the small diameter portion. .
According to a third aspect of the present invention, there is provided the image forming apparatus according to the first or second aspect, wherein the elastic member is disposed near the center in the recording paper width direction.
According to a fourth aspect of the invention, the image forming apparatus according to any one of the first to third aspects is characterized in that the elastic member is a PET member having a thickness of 0.1 to 0.5 mm.

本発明によれば、腰の強い転写材後端のレジストローラニップ通過後の転写前ガイドへ与える衝撃をなくすことによって、後端汚れ画像の発生を防ぐことが可能となる画像形成装置を達成する。   According to the present invention, an image forming apparatus capable of preventing the occurrence of a trailing edge smear image by eliminating the impact applied to the pre-transfer guide after passing through the registration roller nip at the trailing edge of the transfer material having a strong stiffness. .

以下、図面を参照して、本発明の実施の形態を詳細に説明する。図１は電子写真プロセスを利用した画像形成装置であるレーザープリンタの全体構造を示す概略図である。レーザープリンタ本体ケース１内には、その略中央部に像担持体２としての感光体ドラム（第２象限に配置）が設けられている。
像担持体２の周囲には、帯電手段３、現像手段４（第３象限に配置）、転写手段５（第１象限に配置）、クリーニング手段６等が配置されている。また、これらの像担持体２等の下方には、記録紙を１枚ずつ給紙する給紙ローラ９、給紙された記録紙を所定のタイミングで転写手段５側へ送り出すレジストローラ１０（第４象限に配置）等が設けられている。
さらに、像担持体２等の上方には、転写手段５において記録紙へ転写された画像を定着させる定着手段１１において画像定着が行われた記録紙をスタッカー部へ排紙する排紙ローラ１２等が設けられている。
次に、本体ケース１の一部である本体カバー１ａの上面部には画像形成が行われた記録紙が排紙されるスタッカー部１３が形成されている。また本体ケース１内におけるスタッカー部１３の下方には、金属製のケース１４内に収納された電装部１５が設けられている。
この電装部１５は、コントローラ基板１６およびコントロール基板１６上に取り付けられた各種の調整スイッチや制御ユニット（図示せず）等により形成されている。さらに、本体ケース１内におけるケース１４には、電源１７や電送基板１８を収納している。
さらに、その上には像担持体２上への画像書き込みを行う光学装置２０が設けられている。また、本体ケース１の一部に（右方）前カバー２１が設けられており、この前カバー２１には、転写手段５、除電ブラシ（分離手段）２２が取り付けられている。
前カバー２１は、本体ケース１の一部を支点として回転可能となっており、サプライの交換、定着手段の交換、記録紙ジャム時の処理等を行うことができるように構成されている。
手差しトレイ２３は使用するときには、図１の位置に開放されており、使用しないときには、前カバー２１内に収納される。図１において、手差しトレイ２３側が装置本体の正面であり、手差しトレイ２３はユーザが正面から操作できる構成になっている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the overall structure of a laser printer which is an image forming apparatus using an electrophotographic process. In the laser printer main body case 1, a photosensitive drum (arranged in the second quadrant) as an image carrier 2 is provided at a substantially central portion thereof.
Around the image carrier 2, a charging unit 3, a developing unit 4 (arranged in the third quadrant), a transfer unit 5 (arranged in the first quadrant), a cleaning unit 6 and the like are disposed. Also, below these image carriers 2 and the like, a paper feed roller 9 that feeds the recording paper one by one, and a registration roller 10 (the first roller) that feeds the fed recording paper to the transfer means 5 side at a predetermined timing. Arranged in four quadrants).
Further, above the image carrier 2 or the like, a discharge roller 12 or the like that discharges the recording paper on which the image has been fixed by the fixing unit 11 that fixes the image transferred to the recording paper by the transfer unit 5 to the stacker unit. Is provided.
Next, a stacker portion 13 is formed on the upper surface portion of the main body cover 1a which is a part of the main body case 1 and the recording paper on which image formation has been performed is discharged. An electrical component 15 housed in a metal case 14 is provided below the stacker portion 13 in the main body case 1.
The electrical component 15 is formed by a controller board 16, various adjustment switches attached to the control board 16, a control unit (not shown), and the like. Further, the case 14 in the main body case 1 houses a power source 17 and a power transmission board 18.
Furthermore, an optical device 20 for writing an image on the image carrier 2 is provided thereon. A front cover 21 (on the right) is provided on a part of the main body case 1, and a transfer means 5 and a charge eliminating brush (separation means) 22 are attached to the front cover 21.
The front cover 21 is rotatable with a part of the main body case 1 as a fulcrum, and is configured to be able to perform supply replacement, fixing means replacement, processing for recording paper jam, and the like.
The manual feed tray 23 is opened to the position shown in FIG. 1 when used, and is stored in the front cover 21 when not used. In FIG. 1, the manual feed tray 23 side is the front of the apparatus main body, and the manual feed tray 23 is configured to be operated by the user from the front.

図２は本発明による画像形成装置の構成を説明する概略図である。像担持体２のほぼ下に現像手段４を構成する現像ローラ４ａ、像担持体２の右側に転写手段５、像担持体の右下にレジストローラ対（搬送ローラ対）１０が配置されている。
またレジストローラ対１０の上流側にはレジスト前ガイド板３２が、レジストローラの下流側には転写前ガイド（搬送ガイド）３１が配置されている。また本発明のレジストローラ１０を橋渡ししているガイド部材（弾性部材）３３がレジスト前ガイド３２に固定されている。
図３は図２の画像形成装置の長手方向中央部近辺を示す簡略斜視図である。図２および図３において、レジストローラ対１０は、表面がゴムで覆われたレジスト駆動ローラ１０ａと金属のみで形成されたレジスト従動ローラ１０ｂよりなっている。ガイド部材３３は、基部から細幅の先端部３３ａが従動ローラ１０ｂの小径部１０ｂ’内に入り込んで、下流側へ延びている。そして、先端部３３ａは、転写材（記録紙）３４がレジストローラ対のニップ部を通過する際にその片面（転写前ガイド側面）と摺接し、転写材の後端部が通過し終わった際に、転写材後端部がその弾発力によって転写前ガイド３１に衝突する勢いを緩衝するように構成されている。 FIG. 2 is a schematic diagram illustrating the configuration of the image forming apparatus according to the present invention. A developing roller 4a constituting the developing unit 4 is disposed almost below the image carrier 2, a transfer unit 5 is disposed on the right side of the image carrier 2, and a registration roller pair (conveying roller pair) 10 is disposed on the lower right side of the image carrier. .
A pre-registration guide plate 32 is disposed on the upstream side of the registration roller pair 10, and a pre-transfer guide (conveyance guide) 31 is disposed on the downstream side of the registration roller. A guide member (elastic member) 33 that bridges the registration roller 10 of the present invention is fixed to the pre-registration guide 32.
FIG. 3 is a simplified perspective view showing the vicinity of the central portion in the longitudinal direction of the image forming apparatus of FIG. 2 and 3, the registration roller pair 10 includes a registration driving roller 10a whose surface is covered with rubber and a registration driven roller 10b formed of only metal. The guide member 33 extends from the base portion to the downstream side with a narrow tip portion 33a entering the small diameter portion 10b ′ of the driven roller 10b. When the transfer material (recording paper) 34 passes through the nip portion of the registration roller pair, the front end portion 33a is in sliding contact with one surface (the guide side surface before transfer), and when the rear end portion of the transfer material has passed. In addition, the rear end portion of the transfer material is configured to buffer the momentum of collision with the pre-transfer guide 31 by its elastic force.

図４は図２および図３による画像形成装置からのガイド部材を除いた場合を説明する概略図である。図４に示すように、ガイド部材３３がない場合は、腰の強い転写材３４の後端部はレジストローラ対１０（１０ａ、１０ｂ）を通過後、転写前ガイド３１に強く当接してしまう（アの部分）。
かかる場合に、その衝撃で転写前ガイド３１の裏側に溜まっているトナー等３５が舞い散って、像担持体２側に移動し、転写材３４に転写され、後端汚れが発生してしまう。
図５は図２および図３による画像形成装置と同様にガイド部材を設けた場合を説明する概略図である。図５に示すように、ガイド部材３３を設けることにより、腰の強い転写材３４がレジストローラ１０を通過したときに、ガイド部材３３の先端３３ａが転写材後端の力により押圧されて転写前ガイド３１に図５のごとく当接する。
このため、レジストローラ１０から転写材が抜ける時のショックの発生を防止できる。なお、ガイド部材３３は０．１〜０．５ｍｍ厚のＰＥＴ等の部材が望ましい。
ガイド部材３３を取り付けたときと取り付けていないときで、以下の条件でランニング評価を行った。まずＡ４横、画像比率５％を、５００枚連続通紙する。その後１３５Ｋ紙のＡ４サイズを白紙通紙で５枚プリントし後端汚れの発生有無を確認する。
以上を１セットとし、それを３回繰り返し、１３５Ｋ紙の後端汚れの発生枚数およびランクわけを行った。環境は、実験室環境、１０℃１５％、２７℃８０％にて評価を行った。 FIG. 4 is a schematic diagram for explaining a case where the guide member is removed from the image forming apparatus shown in FIGS. As shown in FIG. 4, when the guide member 33 is not provided, the rear end portion of the transfer material 34 having a strong waist is strongly brought into contact with the pre-transfer guide 31 after passing through the registration roller pair 10 (10a, 10b) ( A part).
In such a case, the toner 35 accumulated on the back side of the pre-transfer guide 31 is scattered by the impact and moves to the image carrier 2 side, and is transferred to the transfer material 34, resulting in rear end contamination.
FIG. 5 is a schematic diagram for explaining a case where a guide member is provided as in the image forming apparatus shown in FIGS. As shown in FIG. 5, by providing the guide member 33, when the stiff transfer material 34 passes through the registration roller 10, the front end 33a of the guide member 33 is pressed by the force of the rear end of the transfer material, and before transfer. It contacts the guide 31 as shown in FIG.
For this reason, it is possible to prevent the occurrence of shock when the transfer material comes off from the registration roller 10. The guide member 33 is preferably a member such as PET having a thickness of 0.1 to 0.5 mm.
The running evaluation was performed under the following conditions when the guide member 33 was attached and when the guide member 33 was not attached. First, 500 sheets of A4 landscape and an image ratio of 5% are continuously passed. Thereafter, five A4 size sheets of 135K paper are printed with white paper and whether or not the trailing edge is smeared is confirmed.
The above was made into one set, and this was repeated three times, and the number and rank of the 135K paper trailing edge stains were determined. The environment was evaluated in a laboratory environment, 10 ° C 15%, 27 ° C 80%.

図６は評価結果を表として示す図である。図７は評価結果をグラフとして示す図である。結果を以下に示す。図６および図７に示す通り、ガイド部材３３を取り付けることによって、後端汚れが殆どなくなっていることが解る。
また、副作用の確認のため、４５Ｋ紙、５５Ｋ紙の薄紙も通紙したが、ガイド部材３３を取り付けることで、ジャムが発生したり、シワが発生するという不都合も発生しなかった。
本発明による画像形成装置をさらに説明すれば、この画像形成装置は、像担持体２を第２象限、現像手段を第３象限、転写手段５を第１象限、レジストローラ対１０を第４象限に配置している。
この画像形成装置においては、レジストローラニップの転写材（記録紙）３４の搬送方向上流側から下流側の転写前ガイド３１までを橋渡しするガイド部材３３を画像形成装置本体側に設ける構成を有している。
ガイド部材３３がレジストローラニップ部を橋渡しするさいに、転写材が搬送経路上に押し付けられるローラ側（レジスト駆動ローラ１０ａ）の外径はそのままで、その対になっているローラ（レジスト従動ローラ１０ｂ）を一部小径（小径部１０ｂ’）にすることでガイド部材３３がレジストローラニップ部に挟み込まれない構成になっている。
ガイド部材３３はレジストローラの長手方向の両端ではなく、中央近傍に配置されているので、レジストローラ抜け時のショックを最も効率的に低減できる。レジストローラ抜け時のショック低減手段を全て画像形成装置本体側にて構成している。
また本体筐体に取り付けるので、着脱可能はユニットに設けるよりも寸法精度がでるので転写材搬送性（スキュー、シワ防止）が向上する。また、転写材は長手方向全域に渡ってレジスト駆動ローラ１０ａに当接するので転写材が波打つことがなく、転写不良やシワの発生のない安定した搬送状態を保つことが可能である。 FIG. 6 shows the evaluation results as a table. FIG. 7 is a diagram showing the evaluation results as a graph. The results are shown below. As shown in FIGS. 6 and 7, it is understood that the rear end dirt is almost eliminated by attaching the guide member 33.
Also, 45K paper and 55K paper thin paper were passed for confirmation of side effects, but there was no inconvenience that jamming or wrinkling occurred when the guide member 33 was attached.
The image forming apparatus according to the present invention will be further described. In this image forming apparatus, the image carrier 2 is in the second quadrant, the developing means is in the third quadrant, the transfer means 5 is in the first quadrant, and the registration roller pair 10 is in the fourth quadrant. Is arranged.
This image forming apparatus has a configuration in which a guide member 33 is provided on the image forming apparatus main body side to bridge from the upstream side in the conveyance direction of the transfer material (recording paper) 34 in the registration roller nip to the downstream pre-transfer guide 31. ing.
When the guide member 33 bridges the registration roller nip portion, the outer diameter of the roller side (registration driving roller 10a) on which the transfer material is pressed onto the conveyance path remains unchanged, and the paired roller (registration driven roller 10b) ) Is partially reduced in diameter (small diameter portion 10b ′), the guide member 33 is configured not to be sandwiched between the registration roller nip portions.
Since the guide member 33 is disposed not near both ends of the registration roller in the longitudinal direction but in the vicinity of the center, the shock when the registration roller is pulled out can be most effectively reduced. All the means for reducing the shock when the registration rollers come off are configured on the image forming apparatus main body side.
Further, since it is attached to the main body casing, detachability is more accurate than that provided in the unit, so transfer material transportability (skew and wrinkle prevention) is improved. Further, since the transfer material contacts the registration driving roller 10a over the entire length direction, the transfer material does not wavy, and it is possible to maintain a stable conveyance state without occurrence of transfer failure or wrinkle.

電子写真プロセスを利用した画像形成装置であるレーザープリンタの全体構造を示す概略図。1 is a schematic diagram showing the overall structure of a laser printer that is an image forming apparatus using an electrophotographic process. 本発明による画像形成装置の構成を説明する概略図。1 is a schematic diagram illustrating a configuration of an image forming apparatus according to the present invention. 図２の画像形成装置の長手方向中央部近辺を示す簡略斜視図。FIG. 3 is a simplified perspective view showing the vicinity of a central portion in a longitudinal direction of the image forming apparatus of FIG. 図２および図３による画像形成装置からのガイド部材を除いた場合を説明する概略図。FIG. 4 is a schematic diagram illustrating a case where a guide member is removed from the image forming apparatus according to FIGS. 2 and 3. 図２および図３による画像形成装置と同様にガイド部材を設けた場合を説明する概略図。FIG. 4 is a schematic diagram for explaining a case where a guide member is provided as in the image forming apparatus according to FIGS. 2 and 3. 評価結果を表として示す図。The figure which shows an evaluation result as a table | surface. 評価結果をグラフとして示す図。The figure which shows an evaluation result as a graph. 従来の画像形成装置における各部材の配置を説明する概略図。Schematic explaining the arrangement of each member in a conventional image forming apparatus.

符号の説明Explanation of symbols

３４ 記録紙（転写材）、１０ 搬送ローラ対（レジストローラ対）、１０ａ レジスト駆動ローラ、１０ｂ レジスト従動ローラ、３１ 転写前ガイド（搬送ガイド）、３２ レジスト前ガイド板（搬送ガイド）、３３ 弾性部材（ガイド部材） 34 recording paper (transfer material), 10 conveyance roller pair (registration roller pair), 10a registration driving roller, 10b registration driven roller, 31 pre-transfer guide (conveyance guide), 32 pre-registration guide plate (conveyance guide), 33 elastic member (Guide member)

Claims (4)

記録紙を搬送する１対の搬送ローラ対と、この搬送ローラ対よりも搬送方向下流にあり、記録紙を案内する搬送ガイドとを有する画像形成装置において、前記搬送ローラ対のローラ間には、前記搬送ローラ対のニップ部を通過する記録紙の後端部を前記搬送ガイド側へ押圧する弾性部材が設けられていることを特徴とする画像形成装置。   In an image forming apparatus having a pair of conveyance rollers that convey recording paper and a conveyance guide that is downstream of the conveyance roller pair in the conveyance direction and guides the recording paper, between the rollers of the conveyance roller pair, An image forming apparatus, comprising: an elastic member that presses a rear end portion of the recording paper passing through a nip portion of the conveying roller pair toward the conveying guide. 前記搬送ローラ対の一方のローラ外径は小径部を備え、この小径部に前記弾性部材の一部が嵌合配置されていることを特徴とする請求項１記載の画像形成装置。   The image forming apparatus according to claim 1, wherein the outer diameter of one roller of the conveying roller pair includes a small-diameter portion, and a part of the elastic member is fitted and disposed in the small-diameter portion. 前記弾性部材が前記搬送ローラ対の長手方向の中央近傍に配置されていることを特徴とする請求項１または２記載の画像形成装置。   The image forming apparatus according to claim 1, wherein the elastic member is disposed in the vicinity of the center in the longitudinal direction of the conveying roller pair. 前記弾性部材が、厚さ０．１〜０．５ｍｍのＰＥＴ部材であることを特徴とする請求項１ないし３のいずれか一項記載の画像形成装置。
The image forming apparatus according to claim 1, wherein the elastic member is a PET member having a thickness of 0.1 to 0.5 mm.
JP2004257501A 2004-09-03 2004-09-03 Image forming device Pending JP2006069768A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012250827A (en) * 2011-06-06 2012-12-20 Seiko Epson Corp Recording device and recording method
JP2015048211A (en) * 2013-09-02 2015-03-16 セイコーエプソン株式会社 Recording medium transport device and recording device
JP2020063155A (en) * 2018-10-17 2020-04-23 株式会社リコー Resin sheet, sheet transport device, and image formation device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012250827A (en) * 2011-06-06 2012-12-20 Seiko Epson Corp Recording device and recording method
JP2015048211A (en) * 2013-09-02 2015-03-16 セイコーエプソン株式会社 Recording medium transport device and recording device
JP2020063155A (en) * 2018-10-17 2020-04-23 株式会社リコー Resin sheet, sheet transport device, and image formation device
JP7402425B2 (en) 2018-10-17 2023-12-21 株式会社リコー Sheet conveyance device and image forming device

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