JPH08185063A - Transfer mechanism - Google Patents
Transfer mechanismInfo
- Publication number
- JPH08185063A JPH08185063A JP6340062A JP34006294A JPH08185063A JP H08185063 A JPH08185063 A JP H08185063A JP 6340062 A JP6340062 A JP 6340062A JP 34006294 A JP34006294 A JP 34006294A JP H08185063 A JPH08185063 A JP H08185063A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- transfer material
- guide
- nip portion
- toner image
- 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.)
- Pending
Links
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、レーザビーム
プリンタ等の画像形成装置に使用される転写機構に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer mechanism used in an image forming apparatus such as a copying machine or a laser beam printer.
【０００２】[0002]
【従来の技術】図７に、複写機、レーザビームプリンタ
等の画像形成装置における、トナー画像の転写動作を示
す。2. Description of the Related Art FIG. 7 shows a toner image transfer operation in an image forming apparatus such as a copying machine or a laser beam printer.
【０００３】ドラム状に形成された感光体（以下「感光
ドラム」という）１は、矢印Ｒ１方向に回転自在に支持
されている。この感光ドラム１の表面には、転写ローラ
２が所定の当接圧（以下「ニップ圧」という）で当接さ
れて転写ニップ部Ｎを形成している。転写ローラ２は、
矢印Ｒ２方向に回転する。A drum-shaped photosensitive member (hereinafter referred to as "photosensitive drum") 1 is rotatably supported in the direction of arrow R1. The transfer roller 2 is brought into contact with the surface of the photosensitive drum 1 at a predetermined contact pressure (hereinafter referred to as “nip pressure”) to form a transfer nip portion N. The transfer roller 2 is
It rotates in the direction of arrow R2.
【０００４】画像形成に際し、感光ドラム１表面には、
帯電、露光、現像の各プロセスを経て、トナー画像１０
が形成される。トナー画像１０の転写対象となる転写材
１１は、搬送ローラ、レジストローラ（いずれも不図
示）等を介して、転写ニップ部Ｎに供給される。このよ
うにして供給された転写材１１は、転写ニップ部Ｎにて
挟持搬送され、このときの転写ローラ２のニップ圧によ
って、表面に感光ドラム１上のトナー画像が転写され
る。At the time of image formation, the surface of the photosensitive drum 1 is
After the charging, exposure, and development processes, the toner image 10
Is formed. The transfer material 11 that is the transfer target of the toner image 10 is supplied to the transfer nip portion N via a transport roller, a registration roller (neither is shown), or the like. The transfer material 11 thus supplied is nipped and conveyed at the transfer nip portion N, and the toner image on the photosensitive drum 1 is transferred to the surface by the nip pressure of the transfer roller 2 at this time.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述の
構成によると、感光ドラム１の直径が小さい場合に、転
写時の転写材１１が高いニップ圧をもって感光ドラム１
に接してしまい、図８に示すように、押し固められたト
ナー１０の一部が転写材１１に転写されずに感光ドラム
１表面に残り、転写材１１上のトナー画像の一部が欠落
するいわゆる中抜け画像の原因となることがある。However, according to the above-mentioned configuration, when the diameter of the photosensitive drum 1 is small, the transfer material 11 at the time of transfer has a high nip pressure and the photosensitive drum 1 has a high nip pressure.
As shown in FIG. 8, a part of the pressed toner 10 remains on the surface of the photosensitive drum 1 without being transferred to the transfer material 11, and a part of the toner image on the transfer material 11 is lost. This may cause a so-called hollow image.
【０００６】この現象は、特に、ニップ圧が高くなりが
ちな転写材１１、例えば、厚紙、ＯＨＰシート等の腰の
強い転写材１１において発生しやすい。This phenomenon is particularly likely to occur in the transfer material 11 in which the nip pressure tends to be high, for example, the transfer material 11 having a strong elasticity such as thick paper and OHP sheet.
【０００７】そこで、本発明は、転写材の性状にかかわ
らずトナー画像の良好な転写が行われるようにした転写
機構を提供することを目的とするものである。Therefore, it is an object of the present invention to provide a transfer mechanism capable of transferring a toner image well regardless of the property of the transfer material.
【０００８】[0008]
【課題を解決するための手段】本発明は、上述事情に鑑
みてなされたものであって、表面にトナー画像が形成さ
れる円筒状の感光体に、転写部材を当接させて転写ニッ
プ部を構成し、該転写ニップ部にて転写材を挟持搬送す
ることにより前記感光体上のトナー画像を転写材上に転
写する転写機構において、前記転写ニップ部の近傍に配
置されて転写材の搬送をガイドする転写ガイドを備え、
該転写ガイドは、転写材の性状に応じて転写材を平面状
にガイドする第１の位置と、転写材を前記感光体表面の
形状に応じて曲面状にガイドする第２の位置とに移動可
能なガイド面を有することを特徴とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a transfer member is brought into contact with a cylindrical photosensitive member on the surface of which a toner image is formed, so that a transfer nip portion is formed. And a transfer mechanism for transferring the toner image on the photoconductor onto the transfer material by nipping and transferring the transfer material at the transfer nip portion, the transfer mechanism being disposed near the transfer nip portion. Equipped with a transfer guide that guides
The transfer guide moves to a first position that guides the transfer material in a planar shape according to the property of the transfer material and a second position that guides the transfer material in a curved shape according to the shape of the surface of the photoconductor. It is characterized by having a possible guide surface.
【０００９】この場合、前記転写ガイドは、転写材の搬
送方向についての前記転写ニップ部の下流側に配設して
も、転写材の搬送方向についての前記転写ニップ部の上
流側と下流側とに配設してもよい。In this case, even if the transfer guide is arranged on the downstream side of the transfer nip portion in the transfer material conveying direction, the transfer guide is provided on the upstream side and the downstream side of the transfer nip portion in the transfer material conveying direction. It may be arranged at.
【００１０】また、前記転写ガイドは、転写材の腰の強
弱に応じて、それぞれ第２の位置、第１の位置をとるよ
うにしてもよい。Further, the transfer guides may be set at the second position and the first position, respectively, depending on the strength of the waist of the transfer material.
【００１１】さらに、前記上流側の転写ガイドを介して
前記転写ニップ部に転写材を供給するレジストローラを
有し、該レジストローラが、前記上流側の転写ガイドの
第２の位置に対応する位置に配設されるようにしてもよ
い。Further, a registration roller for supplying a transfer material to the transfer nip portion via the upstream transfer guide is provided, and the registration roller corresponds to a second position of the upstream transfer guide. It may be arranged at.
【００１２】[0012]
【作用】以上構成に基づき、転写材として、例えば、腰
の強い厚紙を使用する場合は、転写ガイドのガイド面を
第２の位置に配置する。トナー画像が転写される転写材
は、この第２の位置にあるガイド面により、円筒状の感
光体表面の形状に応じて曲面状にガイドされる。このた
め、転写ニップ部における感光体表面と転写材との接触
面積が拡大され、単位面積当たりのニップ圧が低くな
る。したがって、腰の強い転写材であっても中抜けが発
生しにくい。According to the above construction, when a strong cardboard, for example, is used as the transfer material, the guide surface of the transfer guide is arranged at the second position. The transfer material onto which the toner image is transferred is guided by the guide surface at the second position into a curved surface shape according to the shape of the surface of the cylindrical photosensitive member. Therefore, the contact area between the surface of the photoconductor and the transfer material in the transfer nip portion is enlarged, and the nip pressure per unit area is reduced. Therefore, even if the transfer material has a strong stiffness, the hollow portion is unlikely to occur.
【００１３】[0013]
【実施例】以下、図面に沿って、本発明の実施例につい
て説明する。 〈実施例１〉図１、図２は、本発明に係る転写機構を組
み込んだ画像形成装置によって行われるトナー画像の転
写動作を表す模式図である。なお、図１は腰の弱い転写
材（例えば、一般のコピー紙）１１ａに対する転写、ま
た、図２は腰の強い転写材（例えば、厚紙、ＯＨＰシー
ト）１１ｂに対するトナー画像の転写動作を示す。な
お、以下、転写材について、腰の強弱を問題にしない場
合は、単に「転写材１１」というものとする。Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> FIGS. 1 and 2 are schematic diagrams showing a toner image transfer operation performed by an image forming apparatus incorporating a transfer mechanism according to the present invention. Note that FIG. 1 shows a transfer operation to a transfer material having a weak stiffness (for example, a general copy paper) 11a, and FIG. 2 shows a transfer operation of a toner image to a transfer material having a strong stiffness (for example, a thick paper or an OHP sheet) 11b. In the following description, the transfer material is simply referred to as “transfer material 11” when the strength of the waist does not matter.
【００１４】これらの図に示す画像形成装置は、像担持
体として、ドラム状の感光体（感光ドラム）１を備えて
いる。感光ドラム１の周囲には、その表面を均一に帯電
する帯電装置、画像情報に応じた露光を行って静電潜像
を形成する露光装置、静電潜像に現像剤（トナー）を付
着させてトナー画像として現像する現像装置（いずれも
不図示）、感光ドラム１上のトナー画像を転写材１１に
転写する転写ローラ（転写装置）２を備えている。この
転写ローラ２は、感光ドラム１表面に所定のニップ圧で
当接されて、感光ドラム１との間に転写ニップ部Ｎを構
成している。The image forming apparatus shown in these figures includes a drum-shaped photosensitive member (photosensitive drum) 1 as an image bearing member. Around the photosensitive drum 1, a charging device that uniformly charges the surface thereof, an exposure device that forms an electrostatic latent image by performing exposure according to image information, and a developer (toner) is attached to the electrostatic latent image. And a transfer roller (transfer device) 2 for transferring the toner image on the photosensitive drum 1 to the transfer material 11. The transfer roller 2 is brought into contact with the surface of the photosensitive drum 1 with a predetermined nip pressure to form a transfer nip portion N between the transfer roller 2 and the photosensitive drum 1.
【００１５】転写材１１の搬送方向についての、転写ニ
ップ部Ｎの上流側（図１、図２における右方）には、２
対のレジストローラ４、５が配置されている。レジスト
ローラ４は、図１に示すように、給紙カセット３に収納
されて給紙ローラ、搬送ローラ（不図示）等の搬送装置
によって搬送されてきた腰の弱い転写材１１ａを、所定
のタイミングで転写ニップ部Ｎに供給するローラであ
り、一方、レジストローラ５は、図２に示すように、手
差しトレイ７から給紙ローラ（不図示）等を介して搬送
されてきた腰の強い転写材１１ｂを、所定のタイミング
で転写ニップ部Ｎに供するローラである。なお、従来の
画像形成装置では、このように２対のレジストローラ
４、５を個別に設けずに、１対のレジストローラで兼用
するのが一般的である。転写ニップ部Ｎの近傍の、その
下流側には、トナー画像転写後の転写材１１をガイドす
る転写ガイド６が配設されている。転写ガイド６は、上
流側の基端部に揺動中心６ｂを有し、下流側の先端部が
矢印Ｒ６方向（図２参照）に移動可能となるように支持
されている。転写ガイド６は、その上面に閉面状のガイ
ド面６ａを有し、上述の揺動によって、このガイド面６
ａがほぼ水平な第１の位置Ｐ1 （図１参照）と、下流側
が高い第２の位置Ｐ2 （図２参照）とをとるように構成
されている。In the upstream side (right side in FIGS. 1 and 2) of the transfer nip portion N in the conveying direction of the transfer material 11, 2
A pair of registration rollers 4 and 5 are arranged. As shown in FIG. 1, the registration rollers 4 transfer the weak transfer material 11a stored in the paper feed cassette 3 and conveyed by a conveyance device such as a paper feed roller and a conveyance roller (not shown) at a predetermined timing. 2 is a roller for supplying the transfer nip portion N to the transfer nip portion N. On the other hand, as shown in FIG. 2, the registration roller 5 is a transfer material that is strong and has been conveyed from the manual feed tray 7 via a paper feed roller (not shown) or the like. A roller 11b is provided to the transfer nip portion N at a predetermined timing. Incidentally, in the conventional image forming apparatus, it is general that one pair of registration rollers are commonly used instead of individually providing the two pairs of registration rollers 4 and 5 as described above. A transfer guide 6 for guiding the transfer material 11 after the transfer of the toner image is provided on the downstream side of the vicinity of the transfer nip portion N. The transfer guide 6 has a swing center 6b at a base end portion on the upstream side, and a tip end portion on the downstream side is supported so as to be movable in a direction of an arrow R6 (see FIG. 2). The transfer guide 6 has a closed guide surface 6a on its upper surface, and the guide surface 6a is formed by the above-described swinging.
It is configured to have a first position P 1 (see FIG. 1) in which a is substantially horizontal and a second position P 2 (see FIG. 2) in which the downstream side is high.
【００１６】上述の構成においては、転写ローラ２と、
転写ガイド６と、レジストローラ４、５とによって、転
写機構を構成することになる。In the above structure, the transfer roller 2 and
The transfer guide 6 and the registration rollers 4 and 5 constitute a transfer mechanism.
【００１７】次に、転写機構の動作を説明する。Next, the operation of the transfer mechanism will be described.
【００１８】上述構成の画像形成装置において、まず、
感光ドラム１表面に現像装置等によってトナー画像が形
成される。ここで、図１に示すように、腰の弱い転写材
１１ａが選択された場合、給紙カセット３から供給され
た転写材１１ａは、その先端をレジストローラ４のニッ
プ部に当接させた状態で待機する。また、転写ガイド６
は、その表面がほぼ水平な第１の位置Ｐ1 をとる。これ
により、レジストローラ４のニップ部と、転写ニップ部
Ｎと、転写ガイド６のガイド面６ａとは、ほぼ同一平面
上に配置されることになる。したがって、感光ドラム１
上のトナー画像に同期するようにして、レジストローラ
４によって転写ニップ部Ｎに供給された転写材１１ａ
は、転写ニップ部Ｎでのトナー画像の転写後、ガイド面
６ａに沿ってほぼ平面状に搬送される。In the image forming apparatus having the above structure, first,
A toner image is formed on the surface of the photosensitive drum 1 by a developing device or the like. Here, as shown in FIG. 1, when the transfer material 11a having a weak stiffness is selected, the transfer material 11a supplied from the paper feed cassette 3 is in a state in which the leading end of the transfer material 11a is brought into contact with the nip portion of the registration roller 4. Wait at. In addition, the transfer guide 6
Takes a first position P 1 whose surface is substantially horizontal. As a result, the nip portion of the registration roller 4, the transfer nip portion N, and the guide surface 6a of the transfer guide 6 are arranged on substantially the same plane. Therefore, the photosensitive drum 1
The transfer material 11a supplied to the transfer nip portion N by the registration roller 4 in synchronization with the upper toner image.
After the toner image is transferred at the transfer nip portion N, is transported in a substantially flat shape along the guide surface 6a.
【００１９】一方、図２に示すように、腰の強い転写材
１１ｂが選択された場合は、次にようになる。転写材１
１ｂは、その先端をレジストローラ５のニップ部に当接
させた状態で待機する。また、転写ガイド６は、その先
端を矢印Ｒ６方向に移動させて、ガイド面６ａを下流側
が高くなるように傾斜させる。これにより、レジストロ
ーラ５のニップ部と、転写ニップ部Ｎと、ガイド面６ａ
とをなだらかに結ぶ曲面は、感光ドラム１表面に対応し
て、下方に向けて緩やかな凸状を構成する。したがっ
て、レジストローラ５から転写ニップ部Ｎに向けて供給
された転写材１１ｂは、トナー画像の転写後、ガイド面
６ａに沿って上昇し、このときの転写材１１ｂの全体
は、図２のように、感光ドラム１表面に対応したなだら
かな曲面を構成する。このため、転写ニップ部Ｎにおけ
る感光ドラム１表面と転写材１１ｂとの接触面が拡大さ
れるとともに、転写材１１ｂにおける転写ニップ部Ｎに
位置する部分には、感光ドラム１表面から離反する方向
の力が作用し、ニップ圧が低減される。このニップ圧の
低減によって、中抜けの発生が防止される。 〈実施例２〉図３、図４に、実施例２の転写機構を示
す。なお、図３は、腰の弱い転写材１１ａに対する転写
動作を、また図４は、腰の強い転写材１１ｂに対する転
写動作を示す。On the other hand, as shown in FIG. 2, when the transfer material 11b having a strong rigidity is selected, the following is performed. Transfer material 1
1b stands by with its tip in contact with the nip portion of the registration roller 5. Further, the transfer guide 6 has its tip moved in the direction of the arrow R6 to incline the guide surface 6a so that the downstream side becomes higher. As a result, the nip portion of the registration roller 5, the transfer nip portion N, and the guide surface 6a
The curved surface that gently connects and forms a gentle downward convex shape corresponding to the surface of the photosensitive drum 1. Therefore, the transfer material 11b supplied from the registration roller 5 toward the transfer nip portion N rises along the guide surface 6a after the transfer of the toner image, and the entire transfer material 11b at this time is as shown in FIG. In addition, a gentle curved surface corresponding to the surface of the photosensitive drum 1 is formed. For this reason, the contact surface between the surface of the photosensitive drum 1 and the transfer material 11b in the transfer nip portion N is enlarged, and the portion of the transfer material 11b located in the transfer nip portion N is separated from the surface of the photosensitive drum 1 in the direction. The force acts and the nip pressure is reduced. The reduction of the nip pressure prevents the occurrence of hollowing. <Second Embodiment> FIGS. 3 and 4 show a transfer mechanism of the second embodiment. 3 shows the transfer operation to the transfer material 11a having a weak stiffness, and FIG. 4 shows the transfer operation to the transfer material 11b having a strong stiffness.
【００２０】本実施例では、実施例１の転写機構と比べ
て、転写ニップ部Ｎの上流側にも転写ガイド８を設けた
点と、一対のレジストローラ９を移動可能に配置した点
とが大きく異なる。転写ガイド８は、下流側の基端部に
揺動中心８ｂを有し、上流側の先端部が矢印Ｒ８方向に
移動することができる。また、転写ガイド８の上面に
は、平面状のガイド面８ａが形成されており、このガイ
ド面８ａは、転写ガイド８ａが転写ガイド８が図３の第
１の位置Ｐ3 をとるとき、ほぼ水平に配置され、一方、
転写ガイド８が図４の第２の位置Ｐ4 をとるとき、上流
側が高い傾斜状に配置される。In this embodiment, as compared with the transfer mechanism of the first embodiment, a transfer guide 8 is provided on the upstream side of the transfer nip portion N and a pair of registration rollers 9 are movably arranged. to differ greatly. The transfer guide 8 has a swing center 8b at the base end portion on the downstream side, and the tip end portion on the upstream side can move in the arrow R8 direction. Further, a planar guide surface 8a is formed on the upper surface of the transfer guide 8, and the guide surface 8a is almost the same when the transfer guide 8a takes the first position P 3 in FIG. Arranged horizontally, while
When the transfer guide 8 takes the second position P 4 in FIG. 4, the upstream side is arranged with a high inclination.
【００２１】トナー画像の転写に際し、腰の弱い転写材
１１ｂが選択されると、レジストローラ９は下方に、転
写ガイド８は第１位置Ｐ3 に、転写ガイド６は第１位置
Ｐ1に配置される。これにより、レジストローラ９のニ
ップ部、ガイド面８ａ、転写ニップ部Ｎ、ガイド面６ａ
は、ほぼ同一平面上に配置され、したがって、トナー画
像転写前後の転写材１１ｂは、平面状に搬送される。When the transfer material 11b having a weak stiffness is selected during the transfer of the toner image, the registration roller 9 is located below, the transfer guide 8 is located at the first position P 3 , and the transfer guide 6 is located at the first position P 1 . To be done. Thereby, the nip portion of the registration roller 9, the guide surface 8a, the transfer nip portion N, the guide surface 6a.
Are arranged substantially on the same plane, and therefore, the transfer material 11b before and after the toner image transfer is conveyed in a plane.
【００２２】図４に示すように、腰の強い転写材１１ｂ
が選択されると、レジストローラ９は上方に、転写ガイ
ド８は第２の位置Ｐ4 に、転写ガイド６は第２の位置Ｐ
2 にそれぞれ配置される。これにより、トナー画像転写
前後の転写材１１ｂは、感光ドラム１表面の形状に応じ
た、下に凸のなだらかな曲面状になる。したがって、実
施例１の場合と同様に、転写ニップ部Ｎにおけるニップ
圧が低減される。As shown in FIG. 4, the transfer material 11b having a strong elasticity
Is selected, the registration roller 9 moves upward, the transfer guide 8 moves to the second position P 4 , and the transfer guide 6 moves to the second position P 4.
2 are arranged respectively. As a result, the transfer material 11b before and after the transfer of the toner image has a gentle curved surface with a downward convex shape according to the shape of the surface of the photosensitive drum 1. Therefore, the nip pressure in the transfer nip portion N is reduced as in the case of the first embodiment.
【００２３】本実施例によると、実施例１と比較して、
レジストローラが１対ですむ、上流側の転写ガイド８に
よって、転写材１１ｂをより感光ドラム１表面形状に近
い形状にすることができ、その分、ニップ圧の低減が可
能である等の効果がある。According to this embodiment, as compared with the first embodiment,
The pair of registration rollers is sufficient, and the transfer guide 8 on the upstream side allows the transfer material 11b to have a shape closer to the surface shape of the photosensitive drum 1, and the nip pressure can be reduced correspondingly. is there.
【００２４】なお、上述の実施例１、実施例２と組み合
わせて、転写ローラ２を、転写材１１の厚さ等に応じて
感光ドラム１に接離するようにするとさらに効果的であ
る。すなわち、転写材１１が腰の弱い転写材１１ａのと
きは、図５のように、転写ローラ２を感光ドラム１に接
触させ、一方、転写材１１が腰の強い転写材１１ｂのと
きは、図６のように、転写ローラ２を感光ドラム１から
離す。これにより、転写材１１が厚い場合でも、ニップ
圧を有効に低減することが可能となる。It is more effective to combine the transfer roller 2 with the photosensitive drum 1 in accordance with the thickness of the transfer material 11 and the like in combination with the above-described first and second embodiments. That is, when the transfer material 11 is the transfer material 11a having a weak stiffness, the transfer roller 2 is brought into contact with the photosensitive drum 1 as shown in FIG. 5, while when the transfer material 11 is the transfer material 11b having a strong stiffness, As in 6, the transfer roller 2 is separated from the photosensitive drum 1. As a result, the nip pressure can be effectively reduced even when the transfer material 11 is thick.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によると、
転写材の性状に応じて、トナー画像転写時の転写材を平
面状にガイドしたり、曲面状にガイドしたりすることに
より、例えば、転写材の厚さが厚い場合でも、ニップ圧
を低減して、中抜けのない良好なトナー画像を転写する
ことができる。As described above, according to the present invention,
Depending on the properties of the transfer material, by guiding the transfer material in a flat shape or a curved shape during toner image transfer, the nip pressure can be reduced even if the transfer material is thick, for example. Thus, it is possible to transfer a good toner image having no voids.
【図１】実施例１の転写機構により、腰の弱い転写材に
トナー画像を転写する様子を示す動作説明図。FIG. 1 is an operation explanatory diagram illustrating a state in which a toner image is transferred to a transfer material having a weak stiffness by a transfer mechanism according to a first exemplary embodiment.
【図２】実施例１の転写機構により、腰の強い転写材に
トナー画像を転写する様子を示す動作説明図。FIG. 2 is an operation explanatory diagram illustrating a state in which a toner image is transferred to a transfer material having a strong elasticity by the transfer mechanism according to the first exemplary embodiment.
【図３】実施例２の転写機構により、腰の弱い転写材に
トナー画像を転写する様子を示す動作説明図。FIG. 3 is an operation explanatory diagram illustrating a state in which a toner image is transferred to a transfer material having a weak stiffness by the transfer mechanism according to the second embodiment.
【図４】実施例２の転写機構により、腰の強い転写材に
トナー画像を転写する様子を示す動作説明図。FIG. 4 is an operation explanatory diagram showing a state in which a toner image is transferred to a transfer material having a strong elasticity by the transfer mechanism according to the second embodiment.
【図５】腰の弱い転写材にトナー画像を転写する際の転
写ローラの位置を示す図。FIG. 5 is a diagram showing a position of a transfer roller when a toner image is transferred onto a transfer material having a weak stiffness.
【図６】腰の強い転写材にトナー画像を転写する際の転
写ローラの位置を示す図。FIG. 6 is a diagram showing a position of a transfer roller when a toner image is transferred onto a transfer material having a strong elasticity.
【図７】従来の転写機構におけるトナー画像に転写動作
を示す図。FIG. 7 is a diagram showing a transfer operation to a toner image in a conventional transfer mechanism.
【図８】従来の転写機構において中抜けが発生する様子
を示す図。FIG. 8 is a diagram showing how a hollow portion occurs in a conventional transfer mechanism.
１ 感光体（感光ドラム） ２ 転写部材（転写ローラ） ３ 給紙カセット ４、５、９ レジストローラ ６、８ 転写ガイド ６ａ、８ａ ガイド面 ６ｂ、８ｂ 揺動中心 ７ 手差しトレイ １０ トナー画像 １１ 転写材 １１ａ 腰の弱い転写材 １１ｂ 腰の強い転写材 Ｐ1 、Ｐ3 第１の位置 Ｐ2 、Ｐ4 第２の位置 Ｎ 転写ニップ部1 photoconductor (photosensitive drum) 2 transfer member (transfer roller) 3 paper feed cassettes 4, 5, 9 registration rollers 6, 8 transfer guides 6a, 8a guide surfaces 6b, 8b swing center 7 manual feed tray 10 toner image 11 transfer material 11a Transfer material with weak rigidity 11b Transfer material with strong rigidity P 1 , P 3 1st position P 2 , P 4 2nd position N Transfer nip part
Claims (5)
感光体に、転写部材を当接させて転写ニップ部を構成
し、該転写ニップ部にて転写材を挟持搬送することによ
り前記感光体上のトナー画像を転写材上に転写する転写
機構において、 前記転写ニップ部の近傍に配置されて転写材の搬送をガ
イドする転写ガイドを備え、 該転写ガイドは、転写材の性状に応じて転写材を平面状
にガイドする第１の位置と、転写材を前記感光体表面の
形状に応じて曲面状にガイドする第２の位置とに移動可
能なガイド面を有する、 ことを特徴とする転写機構。1. A photosensitive member having a cylindrical shape on which a toner image is formed is brought into contact with a transfer member to form a transfer nip portion, and the transfer material is nipped and conveyed at the transfer nip portion. A transfer mechanism for transferring a toner image on a body onto a transfer material is provided with a transfer guide arranged near the transfer nip portion for guiding the conveyance of the transfer material, and the transfer guide is provided in accordance with the property of the transfer material. It has a guide surface movable to a first position for guiding the transfer material in a planar shape and a second position for guiding the transfer material in a curved shape in accordance with the shape of the surface of the photoconductor. Transfer mechanism.
ついての前記転写ニップ部の下流側に配設する、 ことを特徴とする請求項１記載の転写機構。2. The transfer mechanism according to claim 1, wherein the transfer guide is arranged on a downstream side of the transfer nip portion in a transfer material conveying direction.
ついての前記転写ニップ部の上流側と下流側とに配設す
る、 ことを特徴とする請求項１記載の転写機構。3. The transfer mechanism according to claim 1, wherein the transfer guides are arranged on an upstream side and a downstream side of the transfer nip portion in a transfer material conveying direction.
応じて、それぞれ第２の位置、第１の位置をとる、 ことを特徴とする請求項１ないし請求項３のいずれか記
載の転写機構。4. The transfer guide is set at a second position and a first position, respectively, according to the strength of the waist of the transfer material. Transfer mechanism.
写ニップ部に転写材を供給するレジストローラを有し、 該レジストローラが、前記上流側の転写ガイドの第２の
位置に対応する位置に配設される、 ことを特徴とする請求項３または請求項４記載の転写機
構。5. A registration roller for supplying a transfer material to the transfer nip portion via the upstream transfer guide, the registration roller corresponding to a second position of the upstream transfer guide. The transfer mechanism according to claim 3 or 4, wherein the transfer mechanism is disposed in the transfer mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340062A JPH08185063A (en) | 1994-12-29 | 1994-12-29 | Transfer mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6340062A JPH08185063A (en) | 1994-12-29 | 1994-12-29 | Transfer mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08185063A true JPH08185063A (en) | 1996-07-16 |
Family
ID=18333364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6340062A Pending JPH08185063A (en) | 1994-12-29 | 1994-12-29 | Transfer mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08185063A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7158750B2 (en) * | 2002-12-06 | 2007-01-02 | Sharp Kabushiki Kaisha | Paper transport apparatus and paper transport method |
| US7664445B2 (en) * | 2006-08-31 | 2010-02-16 | Konica Minolta Business Technologies, Inc. | Image forming apparatus |
-
1994
- 1994-12-29 JP JP6340062A patent/JPH08185063A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7158750B2 (en) * | 2002-12-06 | 2007-01-02 | Sharp Kabushiki Kaisha | Paper transport apparatus and paper transport method |
| US7664445B2 (en) * | 2006-08-31 | 2010-02-16 | Konica Minolta Business Technologies, Inc. | Image forming apparatus |
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