JPH09240880A - Guide device before transferring - Google Patents
Guide device before transferringInfo
- Publication number
- JPH09240880A JPH09240880A JP5335996A JP5335996A JPH09240880A JP H09240880 A JPH09240880 A JP H09240880A JP 5335996 A JP5335996 A JP 5335996A JP 5335996 A JP5335996 A JP 5335996A JP H09240880 A JPH09240880 A JP H09240880A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- guide member
- sheet
- transfer guide
- image carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複写機やレーザビ
ームプリンタ、ファクシミリと云った電子写真方式で画
像を形成する各種の画像形成装置に用いられる転写前ガ
イド装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-transfer guide device used in various image forming apparatuses such as copying machines, laser beam printers, and facsimiles that form images by electrophotography.
【０００２】[0002]
【従来の技術】電子写真方式で画像を形成する画像形成
装置は、像担持体上に形成され担持している顕像を搬送
されてくるシートに静電転写し、転写後のシートを定着
処理して画像を形成する。2. Description of the Related Art An image forming apparatus for forming an image by an electrophotographic system electrostatically transfers a visible image formed on an image carrier to a conveyed sheet and fixes the sheet after the transfer. To form an image.
【０００３】シートを像担持体との転写位置に案内する
転写前ガイド部材は、転写性の面からシートが像担持体
から離れ過ぎないように、像担持体との間隔が通常１ｍ
ｍ程度に設定される。しかし、厚紙などが搬送されてく
ると、厚みや腰の強さが影響して、円滑な通紙ができ
ず、シートの振動等による画像ノイズが発生したり、ジ
ャムが発生したりする。The pre-transfer guide member that guides the sheet to the transfer position with respect to the image carrier is usually 1 m away from the image carrier so that the sheet is not too far from the image carrier from the transfer surface.
It is set to about m. However, when a thick paper or the like is conveyed, the thickness and the strength of the waist influence, so that the smooth paper cannot be passed, and the image noise due to the vibration of the sheet or the jam occurs.
【０００４】特開平６−１３０８２５号公報は、転写前
ガイド部材を、所定の案内位置から揺動して退避できる
ように像担持体に平行に配した軸によって枢支し、かつ
所定の案内位置の方向にばねで付勢した転写前ガイド装
置を開示している。Japanese Unexamined Patent Publication No. 6-130825 discloses that a pre-transfer guide member is pivotally supported by a shaft arranged parallel to an image carrier so that it can be swung away from a predetermined guide position and retracted. There is disclosed a pre-transfer guide device biased by a spring in the direction of.
【０００５】この転写前ガイド部材は、通常、ばねの付
勢によって所定の案内位置に安定していて、搬送されて
くる普通紙を所定の転写位置に案内し、設定通りの転写
が達成されるようにする。一方、厚紙などが搬送されて
くるとその厚みや腰の強さによって押圧を受けて前記付
勢力に抗し揺動して退避するので、厚紙はその厚みや腰
の強さに拘らず転写前ガイド部材の案内を受けながらス
ムーズに通過し、転写に供される。This pre-transfer guide member is normally stable at a predetermined guide position by the bias of a spring, guides the plain paper being conveyed to a predetermined transfer position, and achieves the transfer as set. To do so. On the other hand, when thick paper or the like is conveyed, it is pressed by the thickness and the strength of the waist and swings against the urging force to retreat. It smoothly passes while being guided by the guide member and is used for transfer.
【０００６】[0006]
【発明が解決しようとする課題】しかし、上記公報に開
示のものは、転写前ガイド部材を揺動できるように枢支
する特別な軸が要るので、部品点数、組み立て工数が増
大する。また、転写前ガイド部材の付勢に抗した退避
は、シートの厚みの大きさや腰の強さに応じて確実に達
成されるように、付勢力は低く設定される必要がある。
このため、画像形成のために定着部を一回通紙されてカ
ールした葉書等のように、大きく変形した腰の強いシー
トが搬送されてくると、転写前ガイド部材は大きく押し
退けられてシートを所定位置に案内できなくなり、例え
ば、シート先端が転写チャージャ部に衝突してジャムし
てしまう可能性がある。However, the device disclosed in the above publication requires a special shaft for pivotally supporting the pre-transfer guide member so that it can swing, so that the number of parts and the number of assembling steps increase. Further, the biasing force needs to be set low so that the retraction against the bias of the pre-transfer guide member is surely achieved according to the size of the sheet and the strength of the waist.
Therefore, when a strongly deformed sheet such as a postcard that has been curled after being passed through the fixing section once for image formation is conveyed, the pre-transfer guide member is largely pushed away to remove the sheet. There is a possibility that the sheet cannot be guided to a predetermined position, and for example, the leading edge of the sheet collides with the transfer charger portion and jams.
【０００７】変形の大きな腰の強いシートに対処するの
に、転写前ガイド部材の退避側の揺動量を規制すること
が考えられ、本発明の１つの課題としている。In order to deal with a strongly deformed sheet having a large deformation, it is considered to regulate the swinging amount of the pre-transfer guide member on the retreat side, which is an object of the present invention.
【０００８】ところで、これを上記公報に開示のものに
適用するには、転写前ガイド部材を枢支する支持部材に
加え、規制部材をもさらに特別に設ける必要があるの
で、部品点数および組み立て工数がさらに増大する。By the way, in order to apply this to the one disclosed in the above publication, in addition to the supporting member for pivotally supporting the pre-transfer guide member, it is necessary to additionally provide the regulating member, so that the number of parts and the number of assembling steps are increased. Will increase further.
【０００９】本発明は、大きく変形した腰の強いシート
に対応できるようにすることを課題としながら、これを
簡単な構造で解決することをも今１つの課題とし、これ
らを満足する転写前ガイド装置を提供することを目的と
する。The present invention has an object to cope with a strongly deformed sheet having a strong rigidity, and another object is to solve the problem with a simple structure. The purpose is to provide a device.
【００１０】[0010]
【課題を解決するための手段】上記のような目的を達成
するために、請求項１の発明は、像担持体上に形成され
たトナー像をシートに転写する転写位置にシートを案内
するための転写前ガイド部材が、前記像担持体から離れ
る方向に所定の案内位置から揺動して退避できるように
揺動自在に構成された転写前ガイド装置であって、前記
転写前ガイド部材の前記退避側への揺動量を規制する規
制手段を設けたことを特徴とする。In order to achieve the above object, the invention of claim 1 guides the sheet to a transfer position where the toner image formed on the image carrier is transferred to the sheet. Of the pre-transfer guide member, wherein the pre-transfer guide member is configured to be swingable from a predetermined guide position in a direction away from the image carrier so as to be retractable. It is characterized in that a regulation means for regulating the amount of swing toward the retreat side is provided.
【００１１】このような構成は、転写方式の別なく採用
でき、転写前ガイド部材は規制位置を限度に揺動して退
避しながら厚紙の厚みや腰の強さに対応するので、普通
紙は勿論、厚紙や腰の強いシートでもスムーズに通紙し
て所定の転写位置に案内できるし、変形の大きな厚紙な
どであっても、転写前ガイド部材は規制部材によって規
制される限度位置まで揺動して退避することによりそれ
を受入れやすくしながら、これ以降は、退避して拡大し
た像担持体との間の隙間内に厚紙などの変形を矯正しつ
つ像担持体との所定の転写位置にジャムの発生なく案内
して転写に供することができる。Such a constitution can be adopted regardless of the transfer method, and since the pre-transfer guide member swings and retreats within the limit of the regulated position to cope with the thickness of thick paper and the strength of the waist, plain paper is not used. Of course, even thick paper or stiff sheets can be smoothly passed and guided to a predetermined transfer position, and even for heavily deformed thick paper, the pre-transfer guide member swings to the limit position regulated by the regulation member. After that, while making it easier to receive it by retreating, it is possible to correct the deformation such as thick paper in the gap between the retreating and expanding image carrier, and then to the predetermined transfer position with the image carrier. It can be guided and used for transfer without the occurrence of jams.
【００１２】請求項２の発明は、請求項１の発明におい
て、さらに、前記転写前ガイド部材は、前記転写位置に
て前記像担持体と当接しつつ回転することにより、像担
持体上に形成されたトナー像を静電的にシートに転写さ
せる転写ローラの回転軸を中心に揺動する。According to a second aspect of the invention, in addition to the first aspect of the invention, the pre-transfer guide member is formed on the image carrier by rotating while being in contact with the image carrier at the transfer position. It swings around the rotation axis of the transfer roller that electrostatically transfers the formed toner image onto the sheet.
【００１３】このような構成では、請求項１の発明に加
え、さらに、転写前ガイド部材は転写ローラの回転軸を
中心として揺動し、この揺動のために特別な支持部材や
これの取付け作業が要らないので、部品点数および組み
立て工数の削減が達成される。With such a construction, in addition to the invention of claim 1, the pre-transfer guide member swings about the rotation axis of the transfer roller, and for this swinging, a special support member and its attachment are attached. Since no work is required, the number of parts and the number of assembly steps can be reduced.
【００１４】請求項３の発明は、請求項１または２の発
明において、さらに、前記規制手段は、前記転写前ガイ
ド部材と一体的に構成され、この転写前ガイド部材から
転写位置の通紙方向下流側に延びて像担持体と対向し、
転写前ガイド部材が退避側の規制位置まで揺動したとき
像担持体と当接してそれ以上の揺動を阻止する位置決め
部材である。According to a third aspect of the present invention, in addition to the first or second aspect of the invention, the regulating means is constructed integrally with the pre-transfer guide member, and the pre-transfer guide member is in the sheet passing direction from the transfer position to the transfer position. Extends downstream and faces the image carrier,
When the pre-transfer guide member swings to the retreat side regulation position, the pre-transfer guide member comes into contact with the image carrier to prevent further swinging.
【００１５】このような構成では、請求項１または２の
発明に加え、さらに、規制手段は、転写前ガイド部材か
ら一体に延びた位置決め部材であるので、特別な部材お
よびその取付けを必要としないで装備でき、しかも、転
写前ガイド部材が規制位置まで揺動したとき像担持体に
当接して転写前ガイド部材がそれ以上退避側に揺動する
のを阻止するので、特別な部材やそれの取付け作業なし
に位置規制することができるので、この規制のために構
造が特に複雑になるようなことがない。しかも、転写前
ガイド部材と一体に動く規制手段が像担持体との当接に
よって転写前ガイド部材の像担持体に対する位置を規制
するので、像担持体１つを基準にして高精度に位置決め
できる。With such a construction, in addition to the invention of claim 1 or 2, since the regulating means is a positioning member integrally extending from the pre-transfer guide member, a special member and its attachment are not required. In addition, when the pre-transfer guide member swings to the regulation position, the pre-transfer guide member abuts against the image carrier to prevent the pre-transfer guide member from further swinging to the retracted side. Since the position can be regulated without installation work, the structure does not particularly complicate the regulation. Moreover, since the regulating means that moves integrally with the pre-transfer guide member regulates the position of the pre-transfer guide member with respect to the image carrier by contact with the image carrier, it is possible to position the image carrier with high accuracy. .
【００１６】[0016]
【発明の実施の形態】以下、本発明の代表的な１つの実
施の形態につき図を参照しながら詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One representative embodiment of the present invention will be described below in detail with reference to the drawings.
【００１７】本実施の形態は、図３に示すような電子写
真方式のレーザビームプリンタに本発明を適用した場合
を示している。This embodiment shows a case where the present invention is applied to an electrophotographic laser beam printer as shown in FIG.
【００１８】図３に示すレーザビームプリンタでは、給
紙トレイ１に積層状態に収容されたシート２は給紙ロー
ラ３によって送り出され、捌きパッド４との間で１枚１
枚に捌かれた後、給紙ローラ３と搬送ガイドローラ５と
の協働によって像担持体としての感光体ドラム６と転写
ローラ７との間の転写部に送られる。In the laser beam printer shown in FIG. 3, the sheets 2 stacked in the sheet feed tray 1 are sent out by the sheet feed roller 3 and one sheet is fed between the sheet 2 and the sorting pad 4.
After being separated into sheets, the sheet is fed to the transfer section between the transfer roller 7 and the photosensitive drum 6 as an image carrier by the cooperation of the sheet feeding roller 3 and the conveyance guide roller 5.
【００１９】感光体ドラム６はイメージングユニット１
１の一部に位置し、図示しない帯電装置にて一様に帯電
された表面に、プリントヘッド８からの画像信号で変調
されたレーザビーム９によって画像が書き込まれ、静電
潜像を形成する。この静電潜像はイメージングユニット
１１内の図示しない現像装置にてトナー現像され顕像と
なる。この顕像は転写部に送られてくるシート２の片面
に転写ローラ７によって静電的に転写される。転写後の
シート２は定着ローラ１２に送られて定着処理され、排
紙ローラ１３によって排紙トレイ１４の上に排出され、
片面プリントが終了する。The photosensitive drum 6 is the imaging unit 1
An image is written by a laser beam 9 modulated by an image signal from a print head 8 on a surface that is located at a part of 1 and is uniformly charged by a charging device (not shown) to form an electrostatic latent image. . This electrostatic latent image is developed with toner by a developing device (not shown) in the imaging unit 11 and becomes a visible image. This visible image is electrostatically transferred by the transfer roller 7 to one surface of the sheet 2 sent to the transfer section. The transferred sheet 2 is sent to a fixing roller 12 and subjected to a fixing process, and is discharged onto a discharge tray 14 by a discharge roller 13,
Single-sided printing ends.
【００２０】両面プリント時は、上記片面プリント後の
シート２は、排紙ローラ１３に達して後端が通紙ガイド
１５を通過した直後の排紙ローラ１３の逆転によってス
イッチバックされ、通紙ガイド１５の案内によってデュ
ープレックスユニット１６に導かれ、未プリント面が感
光体ドラム６と対面する向きで転写部に送られ、次の転
写に供される。転写後のシート２は上記片面プリントの
場合と同様に定着ローラ１２によって定着処理した後、
排紙ローラ１３によって排紙トレイ１４の上に排出さ
れ、両面プリントを終了する。During double-sided printing, the sheet 2 after the single-sided printing is switched back by the reverse rotation of the sheet ejection roller 13 immediately after the sheet reaches the sheet ejection roller 13 and the trailing edge of the sheet 2 passes the sheet passage guide 15. It is guided to the duplex unit 16 by the guide of 15, and is sent to the transfer portion with the unprinted surface facing the photoconductor drum 6 for the next transfer. After the transfer, the sheet 2 is fixed by the fixing roller 12 as in the case of the one-sided printing described above,
The sheet is discharged onto the sheet discharge tray 14 by the sheet discharge roller 13, and the double-sided printing is completed.
【００２１】転写部には転写ローラ７の回転軸７ａによ
って揺動できるように枢支された転写前ガイド部材２１
が設けられている。転写前ガイド部材２１は図１〜図３
に示すように転写ローラ７の通紙方向上流側の直近に位
置するガイド板である。転写前ガイド部材２１の両端部
にはこれに折曲げ一体形成され、あるいは一体に結合さ
れて通紙方向に延びる位置決め側板２２を有し、この位
置決め側板２２のほぼ中央部を図１、図２に示すように
転写ローラ７の回転軸７ａによって枢支している。これ
によって、転写前ガイド部材２１は回転軸７ａを中心に
揺動して先端２１ａが感光体ドラム６に離接できる。し
かし、別の支持構造で揺動できるようにすることもでき
る。A pre-transfer guide member 21 rotatably supported by the rotating shaft 7a of the transfer roller 7 at the transfer portion.
Is provided. The pre-transfer guide member 21 is shown in FIGS.
The guide plate is located immediately upstream of the transfer roller 7 in the sheet passing direction as shown in FIG. At both ends of the pre-transfer guide member 21, there is a positioning side plate 22 that is bent and integrally formed with the pre-transfer guide member 21 or that is integrally connected and extends in the sheet passing direction. A substantially central portion of the positioning side plate 22 is shown in FIGS. As shown in FIG. 3, the rotary shaft 7a of the transfer roller 7 is pivotally supported. As a result, the pre-transfer guide member 21 swings around the rotation shaft 7a so that the leading end 21a can be brought into contact with or separated from the photosensitive drum 6. However, it may be possible to swing with another support structure.
【００２２】位置決め側板２２は、これの背部に設けた
回転軸７ａと同心円の一部となる湾曲部２２ａとプリン
タ本体に設けたストッパ２３との間に働かされた蔓巻き
ばね２４によって感光体ドラム６側に付勢されている。
また、位置決め側板２２はこれを貫通している回転軸７
ａと同心かつほぼ同径に形成した円弧状の転写ローラ位
置決め突起２２ｂを有し、これが前記ばね２４の付勢に
よって感光体ドラム６の両端部に当接して、転写ローラ
７を感光体ドラム６に対して適切な位置に位置決めす
る。ばね２４は蔓巻き部がプリンタ本体に設けられた軸
２５に嵌め合わせて取付けられている。ばね２４の種類
は自由である。The positioning side plate 22 is provided with a rotary shaft 7a provided at the back of the positioning side plate 22 and a curving portion 22a which is a part of a concentric circle, and a stopper 23 provided at the printer body. It is urged to the 6 side.
Further, the positioning side plate 22 has the rotating shaft 7 passing through it.
The transfer roller positioning protrusion 22b is formed in an arc shape concentric with and substantially the same in diameter as a. The transfer roller positioning protrusion 22b is brought into contact with both ends of the photosensitive drum 6 by the urging force of the spring 24, thereby transferring the transfer roller 7 to the photosensitive drum 6. Position it in the proper position with respect to. The spring 24 has a vine winding portion fitted and attached to a shaft 25 provided in the printer body. The type of spring 24 is free.
【００２３】転写前ガイド部材２１は、プリンタ本体に
設けられたストッパ２６との間に働かせた圧縮ばね２７
により、回転軸７ａを中心として感光体ドラム６の側に
揺動するように付勢されている。位置決め側板２２は回
転軸７ａよりも通紙方向上流側の位置で感光体ドラム６
と対向する位置決め突起２２ｃを有し、この位置決め突
起２２ｃが感光体ドラム６の両端部に当接することによ
り、ばね２７で感光体ドラム６の側に付勢された転写前
ガイド部材２１が図１の（ａ）に示すようにその先端部
２１ａと感光体ドラム６との間に普通紙のシート２を通
紙して所定の転写位置に案内するのに好適な所定の隙間
Ｘを持つようにする。Ｘは例えば１ｍｍ程度である。し
かし、これに限られず使用頻度の高いシート２の種類に
合わせるようにするのがよい。ばね２７の種類は自由で
ある。The pre-transfer guide member 21 is provided with a compression spring 27 that works between the pre-transfer guide member 21 and a stopper 26 provided on the printer body.
Thus, it is biased so as to swing toward the photoconductor drum 6 side about the rotation shaft 7a. The positioning side plate 22 is located at a position upstream of the rotating shaft 7a in the sheet passing direction, and the photosensitive drum 6
The pre-transfer guide member 21 urged by the spring 27 toward the photosensitive drum 6 is provided by the positioning protrusions 22c facing each other and contacting both ends of the photosensitive drum 6 as shown in FIG. As shown in (a) of FIG. 7, a predetermined gap X suitable for guiding the sheet 2 of the plain paper to the predetermined transfer position by passing the sheet 2 of the plain paper between the tip portion 21a and the photosensitive drum 6 is provided. To do. X is, for example, about 1 mm. However, the present invention is not limited to this, and it is preferable to match the type of the sheet 2 that is frequently used. The type of spring 27 is free.
【００２４】位置決め側板２２は回転軸７ａよりも通紙
方向下流側で感光体ドラム６と対向する位置決め突起２
２ｄを有し、この位置決め突起２２ｄが図１の（ｂ）に
示すように感光体ドラム６の両端部に当接することによ
り、転写前ガイド部材２１が前記所定位置から退避する
側に揺動するときの揺動量を規制する。この規制によっ
て転写前ガイド部材２１の先端部２１ａと感光体ドラム
６との間の最大間隔がＸ＋Δに規制される。ΔはＸと同
等程度以下がよく、本実施の形態では０．３ｍｍ程度と
してある。しかし、これに限られず通紙されるシート２
の最大の厚みに対応して設定すればよい。本実施の形態
では葉書や封筒程度の厚みに対応できる。 なお、転写
ローラ位置決め突起２２ｂ、位置決め突起２２ｃ、２２
ｄのそれぞれは図２に示すように感光体ドラム６の両端
部にある非画像形成部分（素管部）６ａに当接するの
で、画像形成や感光体ドラム６の寿命に悪影響はない。
ばね２７による転写前ガイド部材２１の押し付け力は、
ばね２４による転写ローラ７の押付け力よりも小さくし
てある。また、ばね２４は位置決め側板２２の揺動中心
（回転軸７ａ）と同心な円弧面である湾曲部２２ａに圧
接しているので、その付勢力は位置決め側板２２および
転写前ガイド部材２１が回転軸７ａを中心に揺動するの
を妨げない。さらに、転写ローラ位置決め突起２２ｂは
回転軸７ａと同心かつほぼ同径に形成した円弧状をな
し、前記位置決め側板２２の揺動中心と同心であるの
で、位置決め側板２２が揺動しても感光体ドラム６との
接触状態は変化しない。従って転写ローラ７の感光体ド
ラム６との接触位置も変化しない。The positioning side plate 22 faces the photosensitive drum 6 on the downstream side of the rotating shaft 7a in the sheet passing direction, and the positioning projection 2
2d, and the positioning protrusion 22d abuts on both ends of the photosensitive drum 6 as shown in FIG. 1B, whereby the pre-transfer guide member 21 swings to the side retracted from the predetermined position. The amount of rocking is regulated. By this regulation, the maximum distance between the tip portion 21a of the pre-transfer guide member 21 and the photosensitive drum 6 is regulated to X + Δ. Δ is preferably equal to or less than X and is about 0.3 mm in the present embodiment. However, the sheet 2 is not limited to this
It may be set according to the maximum thickness of the. In this embodiment, it is possible to cope with a thickness of a postcard or an envelope. The transfer roller positioning protrusion 22b, the positioning protrusions 22c, 22
As shown in FIG. 2, each of the d's abuts the non-image forming portions (element tube portions) 6a at both ends of the photosensitive drum 6, so that there is no adverse effect on image formation or the life of the photosensitive drum 6.
The pressing force of the pre-transfer guide member 21 by the spring 27 is
It is smaller than the pressing force of the transfer roller 7 by the spring 24. Further, since the spring 24 is in pressure contact with the curved portion 22a, which is an arcuate surface concentric with the swing center (rotating shaft 7a) of the positioning side plate 22, the urging force of the spring 24 causes the positioning side plate 22 and the pre-transfer guide member 21 to rotate. It does not prevent swinging around 7a. Further, the transfer roller positioning protrusion 22b has an arc shape formed concentrically with the rotating shaft 7a and having substantially the same diameter, and is concentric with the swing center of the positioning side plate 22. The contact state with the drum 6 does not change. Therefore, the contact position of the transfer roller 7 with the photosensitive drum 6 does not change.
【００２５】上記した本実施の形態の構成では、転写前
ガイド部材２１は通常図１の（ａ）に示す所定位置にあ
って、送られてくるシート２を所定の転写位置に案内
し、所定の転写が達成されるようにする。また厚紙や腰
の強いシート２が送られてくると、転写前ガイド部材２
１は位置決め側板２２の位置決め突起２２ｄが感光体ド
ラム６に当接する図１の（ｂ）に示す規制位置を限度
に、上記図１の（ａ）の所定の位置から図１の（ｂ）の
規制位置の側にばね２７に抗し揺動して退避しながら厚
紙の厚みや腰の強さに対応する。従って、普通紙は勿
論、厚紙や腰の強いシート２でもスムーズに通紙して所
定の転写位置に案内できる。In the above-described structure of the present embodiment, the pre-transfer guide member 21 is normally located at the predetermined position shown in FIG. 1A, and guides the fed sheet 2 to the predetermined transfer position, and the predetermined position. So that the transcription of is achieved. When a thick paper or a strong sheet 2 is fed, the pre-transfer guide member 2
1 is limited to the regulation position shown in FIG. 1B where the positioning protrusion 22d of the positioning side plate 22 abuts on the photosensitive drum 6, from the predetermined position shown in FIG. 1A to the position shown in FIG. It responds to the thickness of the thick paper and the strength of the waist while swinging and retracting against the spring 27 toward the restricted position. Therefore, not only plain paper but also thick paper or strong sheet 2 can be smoothly passed and guided to a predetermined transfer position.
【００２６】また、図１の（ｂ）に実線で示すように変
形の大きな厚紙等のシート２が送られてくると、転写前
ガイド部材２１は位置決め側板２２の位置決め突起２２
ｄに規制される図１の（ｂ）の限度位置までは揺動して
退避し、これを受入れ易くしながら、これ以降は、退避
して拡大した図１の（ｂ）に示す感光体ドラム６との間
の隙間Ｘ＋Δ内にシート２の変形を図１の（ｂ）に仮想
線で示すように矯正しつつ、また、シート２による押し
退け力が働かなくなるか、小さくなるとそれに応じて復
帰しながら、感光体ドラム６との所定の転写位置に確実
に案内し図１の（ｂ）に破線で示すように転写が達成さ
れるようにすることができる。When a sheet 2 such as a cardboard having a large deformation is fed as shown by the solid line in FIG. 1B, the pre-transfer guide member 21 is positioned by the positioning protrusion 22 of the positioning side plate 22.
1B, which is regulated by d, swings and retracts to the limit position of FIG. 1B, makes it easy to receive it, and thereafter retracts and enlarges the photosensitive drum shown in FIG. 1B. While correcting the deformation of the sheet 2 in the gap X + Δ with the sheet 6 as shown by the phantom line in FIG. 1 (b), when the pushing-out force by the sheet 2 does not work or becomes small, the sheet 2 returns accordingly. However, it is possible to surely guide the toner to the predetermined transfer position with respect to the photoconductor drum 6 so that the transfer is achieved as shown by the broken line in FIG.
【００２７】これらの特徴は、転写方式の別なく達成さ
れる。例えば、転写前ガイド部材２１を位置決め側板２
２によって転写チャージャのシールド板やこれの支持部
材に枢支しても同様な作用効果を発揮することができ
る。しかし、本実施の形態のように、転写前ガイド部材
２１が、転写ローラ７の回転軸７ａの支持により揺動し
て上記のような働きをすると、この揺動のために特別な
支持部材やその取付け作業が要らないので、部品点数お
よび組み立て工数が増大することがない。These characteristics are achieved regardless of the transfer method. For example, the pre-transfer guide member 21 is attached to the positioning side plate 2
Even if the shield plate of the transfer charger and the supporting member thereof are pivotally supported by 2, the same effect can be exerted. However, when the pre-transfer guide member 21 oscillates by the support of the rotation shaft 7a of the transfer roller 7 and functions as described above as in this embodiment, a special support member or Since the mounting work is not required, the number of parts and the number of assembling steps do not increase.
【００２８】転写前ガイド部材２１の退避側への揺動量
を規制する規制手段が、転写前ガイド部材２１から転写
部の通紙方向下流側に延びて感光体ドラム６と当接する
ことにより、転写前ガイド部材２１が退避側の規制位置
まで揺動したときそれ以上の揺動を阻止するようにする
位置決め側板２２であり、転写前ガイド部材２１から一
体に延びたものとすることで、特別な部材やそれの取付
け作業なしに装備でき、揺動規制のために特に構造が複
雑になるようなことがない。When the regulating means for regulating the swing amount of the pre-transfer guide member 21 toward the retreat side extends from the pre-transfer guide member 21 to the downstream side in the sheet passing direction of the transfer portion and comes into contact with the photosensitive drum 6, the transfer is performed. The front guide member 21 is a positioning side plate 22 that prevents further rocking when the front guide member 21 swings to the retracted position, and by being integrally extended from the pre-transfer guide member 21, It can be equipped without a member and its mounting work, and the structure is not particularly complicated due to the swing restriction.
【００２９】また、本実施の形態１のように、位置決め
側板２２およびこれの揺動中心、転写ローラ７の全ての
位置が、１つの位置決め側板２２の感光体ドラム６を基
準に決まるので、位置の誤差が生じにくい。しかも、転
写前ガイド部材２１に一体に動く位置決め側板２２の位
置決め突起２２ｃ、２２ｄが感光体ドラム６に当接する
ことによって、転写前ガイド部材２１の位置を規制する
ので、１つの感光体ドラム６を基準に高精度に位置決め
することができる。従って、簡単で安価な構造により高
精度な転写性能を発揮することができる。Further, as in the first embodiment, all the positions of the positioning side plate 22, the center of swing of the positioning side plate 22, and the transfer roller 7 are determined with reference to the photosensitive drum 6 of one positioning side plate 22. Error is unlikely to occur. Moreover, since the positioning protrusions 22c and 22d of the positioning side plate 22 that moves integrally with the pre-transfer guide member 21 come into contact with the photoconductor drum 6, the position of the pre-transfer guide member 21 is regulated. Positioning can be performed with high precision on the reference. Therefore, highly accurate transfer performance can be exhibited with a simple and inexpensive structure.
【００３０】[0030]
【発明の効果】請求項１の発明によれば、転写方式の別
なく、普通紙は勿論、厚紙や腰の強いシートでもスムー
ズに通紙して所定の転写位置に案内できるし、変形の大
きな厚紙等であっても、転写前ガイド部材が限度位置ま
で揺動して退避することによりそれを受入れやすくしな
がら、これ以降は、退避して拡大した像担持体との間の
隙間内に厚紙の変形を矯正しつつ像担持体との所定の転
写位置にジャムの発生なく案内して転写に供することが
できる。According to the invention of claim 1, regardless of the transfer method, not only plain paper but also thick paper or strong sheet can be smoothly passed and guided to a predetermined transfer position, and the deformation is large. Even for thick paper, the pre-transfer guide member swings to the limit position and retracts so that it can be easily received, and thereafter, the thick paper is placed in the gap between the retracted and enlarged image carrier. It is possible to guide the toner to a predetermined transfer position with the image carrier without causing a jam and to use for transfer while correcting the deformation.
【００３１】請求項２の発明によれば、請求項１の発明
に加え、さらに、転写前ガイド部材は転写ローラの回転
軸を中心として揺動し、この揺動のために特別な支持部
材やこれの取付け作業が要らないので、部品点数および
組み立て工数の削減が達成される。According to the invention of claim 2, in addition to the invention of claim 1, the pre-transfer guide member oscillates about the rotation axis of the transfer roller, and a special support member or a special support member for oscillates. Since the mounting work is not required, the number of parts and the number of assembling steps can be reduced.
【００３２】請求項３の発明によれば、請求項１または
２の発明に加え、さらに、規制手段は特別な部材および
その取付けを必要としないで装備でき、しかも、像担持
体との当接により転写前ガイド部材の退避側への揺動位
置を規制するので、特別な部材やそれの取付け作業なし
に位置規制することができるので、この規制のために構
造が特に複雑になるようなことがない。しかも、転写前
ガイド部材と一体に動く規制手段が像担持体との当接に
よって転写前ガイド部材の像担持体に対する位置を規制
するので、像担持体１つを基準にして高精度に位置決め
できる。According to the invention of claim 3, in addition to the invention of claim 1 or 2, the restricting means can be equipped without requiring a special member and its attachment, and further, the restricting means can be brought into contact with the image carrier. Since the swing position of the pre-transfer guide member toward the retreat side is regulated by the means, the position can be regulated without any special member or mounting work thereof, so that the structure is particularly complicated due to this regulation. There is no. Moreover, since the regulating means that moves integrally with the pre-transfer guide member regulates the position of the pre-transfer guide member with respect to the image carrier by contact with the image carrier, it is possible to position the image carrier with high accuracy. .
【図１】本発明の転写前ガイド装置の代表的な一実施の
形態を、所定位置の状態と、退避位置の状態とで示す側
面図である。FIG. 1 is a side view showing a typical embodiment of a pre-transfer guide device of the present invention in a state of a predetermined position and a state of a retracted position.
【図２】図１の装置の正面図である。FIG. 2 is a front view of the apparatus of FIG.
【図３】図１の装置が適用されたレーザビームプリンタ
の概略構成を示す断面図である。FIG. 3 is a sectional view showing a schematic configuration of a laser beam printer to which the apparatus of FIG. 1 is applied.
６ 感光体ドラム ７ 転写ローラ ７ａ 回転軸 ２１ 転写前ガイド部材 ２１ａ 先端部 ２２ 位置決め側板 ２２ｃ、２２ｄ 位置決め突起 ２７ ばね 6 Photoconductor drum 7 Transfer roller 7a Rotation shaft 21 Pre-transfer guide member 21a Tip part 22 Positioning side plates 22c, 22d Positioning protrusion 27 Spring
Claims (3)
トに転写する転写位置にシートを案内するための転写前
ガイド部材が、前記像担持体から離れる方向に所定の案
内位置から揺動して退避できるように揺動自在に構成さ
れた転写前ガイド装置であって、前記転写前ガイド部材
の前記退避側への揺動量を規制する規制手段を設けたこ
とを特徴とする転写前ガイド装置。1. A pre-transfer guide member for guiding a sheet to a transfer position where a toner image formed on the image carrier is transferred to a sheet swings from a predetermined guide position in a direction away from the image carrier. A pre-transfer guide device that is configured to be swingable so that it can be withdrawn and retracted, wherein a pre-transfer guide is provided that restricts a swing amount of the pre-transfer guide member toward the retreat side. apparatus.
にて前記像担持体と当接しつつ回転することにより、像
担持体上に形成されたトナー像を静電的にシートに転写
させる転写ローラの回転軸を中心に揺動する請求項１に
記載の転写前ガイド装置。2. The pre-transfer guide member rotates while contacting the image carrier at the transfer position to electrostatically transfer a toner image formed on the image carrier to a sheet. The pre-transfer guide device according to claim 1, which swings about a rotation axis of the roller.
と一体的に構成され、この転写前ガイド部材から転写位
置の通紙方向下流側に延びて像担持体と対向し、転写前
ガイド部材が退避側の規制位置まで揺動したとき像担持
体と当接してそれ以上の揺動を阻止する位置決め部材で
ある請求項１または２に記載の転写前ガイド装置。3. The pre-transfer guide member is formed integrally with the pre-transfer guide member, extends from the pre-transfer guide member downstream of the transfer position in the sheet passing direction, and faces the image carrier. 3. The pre-transfer guide device according to claim 1, wherein the pre-transfer guide device is a positioning member that comes into contact with the image carrier to prevent further rocking when rocking to the retreat side regulation position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05335996A JP3298401B2 (en) | 1996-03-11 | 1996-03-11 | Guide device before transfer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05335996A JP3298401B2 (en) | 1996-03-11 | 1996-03-11 | Guide device before transfer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09240880A true JPH09240880A (en) | 1997-09-16 |
| JP3298401B2 JP3298401B2 (en) | 2002-07-02 |
Family
ID=12940618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05335996A Expired - Fee Related JP3298401B2 (en) | 1996-03-11 | 1996-03-11 | Guide device before transfer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3298401B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6943491B2 (en) | 2002-01-15 | 2005-09-13 | Matsushita Electric Industrial Co., Ltd. | Picture tube device having lead electrode with a curved shape |
| US7333761B2 (en) | 2004-05-18 | 2008-02-19 | Kyocera Mita Corporation | Transfer media transport guide mechanism for image forming device |
| CN102968033A (en) * | 2011-08-29 | 2013-03-13 | 株式会社理光 | Image forming apparatus |
| JP2017211526A (en) * | 2016-05-26 | 2017-11-30 | 桂川電機株式会社 | Image formation device |
-
1996
- 1996-03-11 JP JP05335996A patent/JP3298401B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6943491B2 (en) | 2002-01-15 | 2005-09-13 | Matsushita Electric Industrial Co., Ltd. | Picture tube device having lead electrode with a curved shape |
| US7333761B2 (en) | 2004-05-18 | 2008-02-19 | Kyocera Mita Corporation | Transfer media transport guide mechanism for image forming device |
| CN100437378C (en) * | 2004-05-18 | 2008-11-26 | 京瓷美达株式会社 | Image forming device |
| US7634219B2 (en) | 2004-05-18 | 2009-12-15 | Kyocera Mita Corporation | Transfer media transport guide mechanism for image forming device |
| CN102968033A (en) * | 2011-08-29 | 2013-03-13 | 株式会社理光 | Image forming apparatus |
| CN102968033B (en) * | 2011-08-29 | 2015-08-12 | 株式会社理光 | Image processing system |
| US9213270B2 (en) | 2011-08-29 | 2015-12-15 | Ricoh Company, Ltd. | Image forming apparatus |
| JP2017211526A (en) * | 2016-05-26 | 2017-11-30 | 桂川電機株式会社 | Image formation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3298401B2 (en) | 2002-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8602414B2 (en) | Separating device, fixing device, medium conveying device and image forming apparatus | |
| US8002276B2 (en) | Sheet conveyance device | |
| JP3354362B2 (en) | Automatic paper feeder | |
| US20120242029A1 (en) | Sheet conveying apparatus and image forming apparatus | |
| JPH08157107A (en) | Paper feeder | |
| JP3728216B2 (en) | Image forming apparatus | |
| JP3298401B2 (en) | Guide device before transfer | |
| US11198581B2 (en) | Sheet processing apparatus and image forming apparatus | |
| US20010010769A1 (en) | Electrophotographic apparatus | |
| US11619902B2 (en) | Conveyance control for image forming apparatus | |
| JPH0628515Y2 (en) | Paper feeder | |
| EP2372460B1 (en) | Image-forming device | |
| JP2003122142A (en) | Toner image transfer device | |
| US6782237B2 (en) | Shape-correcting device for sheets and electrophotographic device | |
| JPH11305506A (en) | Image forming device | |
| JP3463716B2 (en) | Image forming device | |
| JP4829727B2 (en) | Sheet conveying apparatus and image forming apparatus | |
| JP2001328747A (en) | Sheet conveying device and image forming device | |
| JP7171329B2 (en) | Sheet conveying device and image forming device | |
| JPH1069170A (en) | Developing device | |
| JPH09297469A (en) | Image forming device | |
| JP4038722B2 (en) | Fixing apparatus and image forming apparatus | |
| JP3501900B2 (en) | Image forming device | |
| JPH0326630A (en) | Recording paper transfer device for electrophotography unit | |
| JP2002156802A (en) | Image forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080419 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090419 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090419 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100419 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110419 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120419 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130419 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140419 Year of fee payment: 12 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |