JPH08146685A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH08146685A JPH08146685A JP6309768A JP30976894A JPH08146685A JP H08146685 A JPH08146685 A JP H08146685A JP 6309768 A JP6309768 A JP 6309768A JP 30976894 A JP30976894 A JP 30976894A JP H08146685 A JPH08146685 A JP H08146685A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- roller
- transfer paper
- image forming
- photoconductor
- 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
- Paper Feeding For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
- Registering Or Overturning Sheets (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は転写ローラを用いる複写
機、FAX、プリンタ等の画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a fax machine or a printer, which uses a transfer roller.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】図9に
従来の画像形成装置を示す。図中1が感光体で、感光体
1の周りには帯電器2、書き込みまたは露光用のレーザ
光Lを射出する光学ユニット3、現像ユニット4、転写
チャージャ5、クリーニングブレード6を有するクリー
ニングユニット7が設けられ、給紙ユニット8から給紙
コロ9によって給紙される転写紙は、中間ローラ10、
搬送ローラ11、転写紙検知手段13を経てレジストロ
ーラ15に送られ、所定のタイミングでもって搬送ロ一
ラ11を停止させてレジストローラ対15のニップ部に
転写紙の先端を突き当て、転写紙にたわみを持たせるこ
とによりスキューや皺の発生を防止している。なお図中
12はガイド部である。2. Description of the Related Art FIG. 9 shows a conventional image forming apparatus. In the figure, reference numeral 1 denotes a photoconductor, and a cleaning unit 7 having a charger 2, an optical unit 3 for emitting a laser beam L for writing or exposure, a developing unit 4, a transfer charger 5, and a cleaning blade 6 around the photoconductor 1. Is provided, the transfer paper fed from the paper feed unit 8 by the paper feed roller 9 is the intermediate roller 10,
The transfer roller 11 is sent to the registration roller 15 via the transfer roller 11 and the transfer sheet detection unit 13, and the transfer roller 11 is stopped at a predetermined timing to abut the tip of the transfer sheet against the nip portion of the registration roller pair 15 to transfer the transfer sheet. The flexure prevents the occurrence of skew and wrinkles. In the figure, 12 is a guide part.
【0003】しかしながらレジストローラ対15を設け
ることはスキューや皺の発生を防止するためには重要で
あっても、その分装置の構成要素が増え、コストが掛か
っていた。特開昭59−68765号公報に開示されて
いる技術では、転写ローラをレジストローラ対のどちら
か一方としてこの問題を解決しようとしているが、1本
のレジストローラは設けなければならず、結局コストダ
ウンをあまり図れていなかった。However, although it is important to provide the pair of registration rollers 15 in order to prevent the occurrence of skew and wrinkle, the number of constituent elements of the apparatus is increased and the cost is increased. In the technique disclosed in Japanese Patent Laid-Open No. 59-68765, this problem is solved by using the transfer roller as either one of the pair of registration rollers, but one registration roller must be provided, which results in cost reduction. I wasn't trying to go down.
【0004】本発明は上記の点に鑑み、レジストローラ
対を削除してコストダウンと小型化を図れる画像形成装
置を提供することを目的とする。In view of the above points, an object of the present invention is to provide an image forming apparatus capable of reducing the cost and downsizing by eliminating the registration roller pair.
【0005】[0005]
【課題を解決するための手段】本発明に係る画像形成装
置は上記目的を達成するために、感光体、転写ロ一ラ、
搬送ローラ及び転写紙検知手段を含み、転写紙を上記感
光体と上記転写ロ一ラのニップ部にたるむよう突き当
て、所定のタイミングで上記搬送ローラを一旦停止さ
せ、この時上記転写ローラを停止させるようにした構成
としたものである。In order to achieve the above object, an image forming apparatus according to the present invention is provided with a photoconductor, a transfer roller,
Includes a conveyance roller and transfer paper detection means, but abuts the transfer paper so as to slacken the nip portion of the photoconductor and the transfer roller, temporarily stops the conveyance roller at a predetermined timing, and stops the transfer roller at this time. It is configured to be made to.
【0006】本発明に係る画像形成装置は、上記転写紙
のたるみ部分が上記感光体に接触しないようにするガイ
ド部材を設けた構成とすることができる。The image forming apparatus according to the present invention may have a structure in which a guide member is provided to prevent the slack portion of the transfer paper from coming into contact with the photoconductor.
【0007】本発明に係る画像形成装置は、上記転写紙
検知手段による検知位置と上記感光体と上記転写ローラ
のニップ部の距離Llと、書き込みまたは露光位置と上
記ニップ部の距離L2を、Ll>L2となるようにした
構成とすることができる。In the image forming apparatus according to the present invention, the distance L1 between the detection position of the transfer paper detection means and the nip portion between the photoconductor and the transfer roller, and the distance L2 between the writing or exposure position and the nip portion are Ll. The configuration may be such that> L2.
【0008】本発明に係る画像形成装置は、上記搬送ロ
ーラの線速Vrを上記感光体の線速Vk以上となるよう
にした構成とすることができる。The image forming apparatus according to the present invention may be arranged such that the linear velocity Vr of the conveying roller is equal to or higher than the linear velocity Vk of the photosensitive member.
【0009】本発明に係る画像形成装置は、上記感光体
の摩擦係数μk、上記転写紙の摩擦係数μp、上記転写
ローラの摩擦係数μrが、μk<μp<μrとなるよう
にした構成とすることができる。The image forming apparatus according to the present invention is configured such that the friction coefficient μk of the photoconductor, the friction coefficient μp of the transfer paper, and the friction coefficient μr of the transfer roller are μk <μp <μr. be able to.
【0010】本発明に係る画像形成装置は、上記転写ロ
ーラの研磨目方向を転写紙の進入方向と同方向にした構
成とすることができる。The image forming apparatus according to the present invention may have a configuration in which the direction of the polishing grain of the transfer roller is the same as the direction of the transfer paper entering.
【0011】[0011]
【実施例】以下本発明の実施例を図面を参照して説明す
る。図1は本発明に係る画像形成装置の一実施例の要部
を示す図で、基本的な構成は図8の装置と同様であるの
で共通する部分には同一の符号を付すに止め重複する説
明は省略するが、本実施例装置は図から明らかなように
レジストローラあるいはレジストローラ対を備えていな
い。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a main part of an embodiment of an image forming apparatus according to the present invention. Since the basic structure is the same as that of the apparatus of FIG. 8, common parts are designated by the same reference numerals and overlapped. Although not described, the apparatus of this embodiment does not include a registration roller or a registration roller pair as is apparent from the drawing.
【0012】次に本実施例装置の作像プロセス動作を説
明する。感光体1は矢印A方向に回転し、帯電器2で帯
電され、書き込みまたは露光用のレーザ光Lで潜像が形
成され、現像ユニット4で作像され、転写ローラ5aに
よって転写紙Pに転写される。感光体1上の余剰トナー
はクリーニングブレード6でクリーニングされクリーニ
ングユニット7に溜まる。一方、転写紙Pは矢印B方向
に搬送され、定着装置(図示せず)により画像が定着さ
れる。Next, the image forming process operation of the apparatus of this embodiment will be described. The photoconductor 1 rotates in the direction of arrow A, is charged by the charger 2, forms a latent image with the laser light L for writing or exposure, is formed by the developing unit 4, and is transferred onto the transfer paper P by the transfer roller 5a. To be done. Excess toner on the photoconductor 1 is cleaned by the cleaning blade 6 and collected in the cleaning unit 7. On the other hand, the transfer paper P is conveyed in the direction of arrow B, and the image is fixed by a fixing device (not shown).
【0013】転写紙Pの給紙、搬送動作を説明する。給
紙ユニット8から給紙コロ9により給紙された転写紙P
は、中間ローラ10、搬送ローラ11により搬送され、
ガイド部12に沿ってその先端が感光体1と転写ローラ
5aのニップ部Nに至るまで搬送される。転写紙検知手
段13により検知された転写紙Pの先端が、感光体1と
転写ローラ5aのニップ部Nに到達すると、所定のタイ
ミングにより転写紙P先端がたるむように搬送ローラ1
1が一旦停止する。これにより、転写紙P先端の左右ど
ちらかが先に到達しても転写紙P後端からの搬送力によ
り、左右先端位置のズレがなくなり、スキューや皺の発
生を防ぐことができる(図2A、B及び図3A、B参
照)。The operation of feeding and conveying the transfer paper P will be described. Transfer paper P fed from the paper feeding unit 8 by the paper feeding roller 9
Is transported by the intermediate roller 10 and the transport roller 11,
The leading end is conveyed along the guide portion 12 to the nip portion N between the photoconductor 1 and the transfer roller 5a. When the leading edge of the transfer sheet P detected by the transfer sheet detecting unit 13 reaches the nip portion N between the photoconductor 1 and the transfer roller 5a, the transport roller 1 is slackened at a predetermined timing.
1 stops once. As a result, even if either the left or right end of the transfer paper P arrives first, the conveyance force from the rear end of the transfer paper P eliminates the displacement of the left and right front end positions and prevents the occurrence of skew and wrinkles (FIG. 2A). , B and FIGS. 3A, B).
【0014】一方、転写紙検知手段13により検知され
た後、所定タイミングにより感光体1に書き込みまたは
露光用のレーザ光Lで潜像が形成され、現像ユニット4
で作像された画像が転写ローラ5aで転写紙Pに転写さ
れる。転写部近傍の構成によっては、転写紙P先端がた
るむ時にたるんだ部分Xが感光体1に接触して画像擦れ
が発生することがある。ガイド部材14はこれを防止し
ているる。但し通常は転写紙P先端の白抜けを設ける場
合があるため、数mmは接触していても構わない(図3
A参照)。On the other hand, after being detected by the transfer paper detecting means 13, a latent image is formed on the photosensitive member 1 by the laser light L for writing or exposing at a predetermined timing, and the developing unit 4
The image formed in (1) is transferred to the transfer paper P by the transfer roller 5a. Depending on the configuration in the vicinity of the transfer portion, when the front end of the transfer paper P sags, the slack portion X may come into contact with the photoconductor 1 to cause image rubbing. The guide member 14 prevents this. However, since a white spot may be usually provided at the front end of the transfer paper P, a few mm may be in contact (Fig. 3).
(See A).
【0015】転写紙検知手段13の位置と感光体1と転
写ローラ5aのニップ部Nの距離をL1とし、書き込み
または露光位置とニップ部Nの距離をL2とすると、本
実施例ではL1>L2となるよう構成すると、転写紙検
知手段13で転写紙Pの先端を検知した直後に書き込み
または露光が開始され、転写紙Pが転写部にたるみを持
って停止した直後に感光体1上に作像された画像が、ほ
とんどタイムラグなく転写されるという良好なタイミン
グが得られる(図4参照)。なお、本実施例では転写紙
検知手段13の位置を搬送ローラ11の上流側に配置し
ているが、L1>L2の位置関係であれば、搬送ローラ
11の下流側でもよい。If the distance between the position of the transfer paper detecting means 13 and the nip portion N between the photoconductor 1 and the transfer roller 5a is L1, and the distance between the writing or exposure position and the nip portion N is L2, then L1> L2 in this embodiment. With such a configuration, writing or exposure is started immediately after the transfer paper detection unit 13 detects the leading end of the transfer paper P, and the transfer paper P is formed on the photoconductor 1 immediately after the transfer paper P stops with a slack in the transfer portion. Good timing is obtained in which the imaged image is transferred with almost no time lag (see FIG. 4). In this embodiment, the position of the transfer sheet detecting means 13 is arranged on the upstream side of the transport roller 11, but it may be on the downstream side of the transport roller 11 as long as the positional relationship is L1> L2.
【0016】以上の関係諸動作を図5のタイミングチャ
ートで説明する。まず搬送ローラ11がONとなり、帯
電するために感光体1がONとなり、さらに続いて帯電
器2がONとなる。転写紙Pが転写紙検知手段13の位
置を通過した後、所定のタイミング(L1+α−L2:
但しαは転写紙Pのたるみ量である。)で書き込みまた
は露光用の光学ユニット3がONとなり、転写紙Pが感
光体1と転写ローラ5aのニップ部Nにたるみを持って
突き当たるタイミング(L1+α)で一旦搬送ローラ1
1がOFFとなる。これとほぼ同時に感光体1上に作像
された画像が転写紙Pに転写されるように転写ローラ5
aがONとなる。The above-mentioned various operations will be described with reference to the timing chart of FIG. First, the transport roller 11 is turned on, the photoconductor 1 is turned on for charging, and then the charger 2 is turned on. After the transfer sheet P has passed the position of the transfer sheet detecting means 13, a predetermined timing (L1 + α−L2:
However, α is the slack amount of the transfer paper P. ), The optical unit 3 for writing or exposure is turned on, and the transfer roller 1 is temporarily transferred at the timing (L1 + α) at which the transfer paper P strikes the nip portion N between the photoconductor 1 and the transfer roller 5a with a slack.
1 turns off. Almost at the same time, the transfer roller 5 is used so that the image formed on the photoconductor 1 is transferred to the transfer paper P.
a turns on.
【0017】次に、停止していた搬送ローラ11がすぐ
にONとなる。この時の停止時間は、たるみ量αが吸収
されて転写紙Pが伸びきらないような時間とする。これ
により画像ブレ等のジターを防ぐ。これ以降の各動作の
OFFタイミングは、転写紙Pの長さによって異なる。
また以上のタイミングは、転写紙搬送及びプロセス工程
のタイムラグのほとんどない例である。Next, the conveyance roller 11 which has been stopped is immediately turned on. At this time, the stop time is set such that the slack amount α is absorbed and the transfer paper P does not extend completely. This prevents jitter such as image blurring. The OFF timing of each operation thereafter is different depending on the length of the transfer paper P.
Further, the above timing is an example in which there is almost no time lag between the transfer paper conveyance and the process steps.
【0018】ところで、転写紙Pの搬送速度が感光体1
の線速Vkに等しくないと、転写紙P上の画像伸びや画
像縮みが生じる。搬送ローラ11の線速Vrにより転写
紙Pの搬送速度が影響するため、少なくとも転写紙P上
の画像伸びに関しては、転写紙Pを引っ張る搬送ローラ
11の線速Vrでは困るので、Vr≧Vkとする。ま
た、転写紙Pのたるみ量αが吸収されて転写紙Pが伸び
きらないよう、停止していた搬送ローラ11がすぐにO
Nするタイミングと併せると、画像伸びや画像ブレ等の
ジターに対しての防止効果が得られる。By the way, the transfer sheet P is conveyed at a speed of the photosensitive member 1.
If it is not equal to the linear velocity Vk of, the image expansion or contraction on the transfer paper P occurs. Since the transport speed of the transfer paper P is influenced by the linear velocity Vr of the transport roller 11, at least regarding the image expansion on the transfer paper P, the linear velocity Vr of the transport roller 11 that pulls the transfer paper P is problematic, so Vr ≧ Vk. To do. Further, the conveying roller 11 which has been stopped is immediately turned to O so that the slack amount α of the transfer paper P is absorbed and the transfer paper P is not fully extended.
Combined with the timing of N, the effect of preventing the image stretching and the image blurring can be obtained.
【0019】さらに、感光体1の摩擦係数をμk、転写
紙Pの摩擦係数をμp、転写ローラ5aの摩擦係数をμ
rとしたとき、μk<μp<μrとなるよう構成する。
このような関係をとれば、転写紙Pの摩擦係数μpに対
し、相手部材の摩擦係数が小さければ転写紙Pは搬送せ
ず、また大きければ転写紙Pは搬送される。したがっ
て、相手部材である感光体1の摩擦係数μkが小さいた
め、回転していても感光体1は転写紙Pを搬送しない。
また、相手部材である転写ローラ5aの摩擦係数μrが
大きいため、転写ローラ5aが回転することにより転写
紙Pは搬送される。これによって、転写紙P先端のレジ
ストズレが極力防止される。Further, the friction coefficient of the photoconductor 1 is μk, the friction coefficient of the transfer paper P is μp, and the friction coefficient of the transfer roller 5a is μ.
When r is set, μk <μp <μr.
With such a relationship, if the friction coefficient of the transfer paper P is smaller than the friction coefficient of the transfer paper P, the transfer paper P is not conveyed, and if it is larger, the transfer paper P is conveyed. Therefore, since the friction coefficient μk of the photoconductor 1 which is the counterpart member is small, the photoconductor 1 does not convey the transfer paper P even when it is rotating.
Further, since the friction coefficient μr of the transfer roller 5a, which is a counterpart member, is large, the transfer sheet P is conveyed by the rotation of the transfer roller 5a. As a result, misregistration of the leading edge of the transfer paper P is prevented as much as possible.
【0020】一例として対転写紙の摩擦係数で考える
と、感光体1の摩擦係数μkは0.3以下、転写紙Pの
摩擦係数μpは約0.6、転写ローラ5aの摩擦係数μ
rは0.7以上としたところ所期のように転写紙P先端
のレジストズレが防止された。As an example, considering the friction coefficient of the transfer paper, the friction coefficient μk of the photoconductor 1 is 0.3 or less, the friction coefficient μp of the transfer paper P is about 0.6, and the friction coefficient μ of the transfer roller 5a.
When r was set to 0.7 or more, the registration deviation of the front end of the transfer paper P was prevented as expected.
【0021】また感光体1と転写ローラ5aのニップ部
Nに転写紙Pの先端が接触する時、場合によっては先に
転写ローラ5aに接触することも考えられるので、図7
に示すように転写ローラ5aの研磨目方向を転写紙Pの
進入方向(図中矢印方向)と同方向にしておけば、転写
紙Pの先端が転写ローラ5aに引っ掛かってニップ部N
に到達しないような不送りジャム(図8B参照)を防止
し、転写紙Pの先端を転写ローラ5aに引っ掛からずに
ニップ部Nに到達させることができる(図8A参照)。Further, when the leading end of the transfer sheet P comes into contact with the nip portion N between the photosensitive member 1 and the transfer roller 5a, it may be possible to come into contact with the transfer roller 5a first in some cases.
As shown in FIG. 3, if the polishing eye direction of the transfer roller 5a is set to be the same as the approach direction of the transfer paper P (the direction of the arrow in the figure), the leading end of the transfer paper P is caught by the transfer roller 5a and the nip portion N is formed.
It is possible to prevent a non-feeding jam (see FIG. 8B) that does not reach the end of the transfer sheet P and reach the nip portion N without catching the leading end of the transfer sheet P on the transfer roller 5a (see FIG. 8A).
【0022】なお、本実施例では感光体をベルト状のも
のとしているが、ドラム感光体でもよい。同様に帯電器
はチャージャであるが、ローラ、ブラシ、ブレード等の
他の帯電方式でもよい。In this embodiment, the photoconductor is belt-shaped, but it may be a drum photoconductor. Similarly, the charger is a charger, but other charging methods such as rollers, brushes, blades, etc. may be used.
【0023】[0023]
【発明の効果】請求項1に係る画像形成装置は以上説明
してきたように、転写紙を感光体と転写ローラのニップ
部に突き当ててたるませるために所定のタイミングで搬
送ローラを一旦停止させるよう構成したことにより、転
写紙のスキューや皺を防ぐレジスト機能を持たせること
ができ、レジストローラを削除することでコストダウン
及び装置の小型化が達成できるようになるという効果が
ある。As described above, in the image forming apparatus according to the first aspect of the present invention, the conveying roller is temporarily stopped at a predetermined timing in order to slacken the transfer paper against the nip portion between the photoconductor and the transfer roller. With this configuration, it is possible to provide a resist function of preventing skew and wrinkles of the transfer paper, and it is possible to achieve cost reduction and device miniaturization by removing the registration roller.
【0024】請求項2に係る画像形成装置は、転写紙の
たるみ部が感光体側に接触しないようガイド部材を設け
たことにより、転写紙の擦れを防ぎ、転写紙の画像汚れ
を防止することができるようになるという効果がある。In the image forming apparatus according to the second aspect of the present invention, the guide member is provided so that the slack portion of the transfer paper does not come into contact with the photosensitive member side, so that the transfer paper can be prevented from being rubbed and the transfer paper can be prevented from being stained. The effect is that you will be able to.
【0025】請求項3に係る画像形成装置は、転写紙検
知位置と感光体と転写ローラのニップ部距離L1と書き
込みまたは露光位置と該ニップ部距離L2とが、L1>
L2となるよう構成したことにより、転写紙検知直後に
書き込みまたは露光が開始され、転写紙が転写部にたる
みを持って停止した直後に感光体上に作像された画像が
転写される良好なタイミングが得られ、高速化の対応が
可能となるという効果がある。In the image forming apparatus according to the third aspect, the transfer paper detection position, the nip distance L1 between the photosensitive member and the transfer roller, the writing or exposure position and the nip distance L2 are L1>
With the configuration of L2, writing or exposure is started immediately after the transfer paper is detected, and the image formed on the photoconductor is transferred immediately after the transfer paper has a slack in the transfer portion and is stopped. There is an effect that timing can be obtained and high speed can be coped with.
【0026】請求項4に係る画像形成装置は、搬送ロー
ラ線速Vrを感光体線速Vk以上となるよう構成したこ
とにより、転写紙を引っ張ることによる画像伸びや画像
ブレ等のジター防止することができるという効果があ
る。In the image forming apparatus according to the fourth aspect of the present invention, the conveying roller linear velocity Vr is set to be equal to or higher than the photosensitive member linear velocity Vk, so as to prevent jitter such as image extension and image blur caused by pulling the transfer paper. There is an effect that can be.
【0027】請求項5に係る画像形成装置は、感光体の
摩擦係数をμk、転写紙の摩擦係数をμp、転写ローラ
の摩擦係数をμrとしたとき、μk<μp<μrとなる
よう構成したことにより、転写紙に対する摩擦係数の大
小関係により転写紙先端のレジストズレを極力防止する
ことができるようになるという効果がある。An image forming apparatus according to a fifth aspect of the present invention is configured such that μk <μp <μr, where μk is the friction coefficient of the photoconductor, μp is the friction coefficient of the transfer paper, and μr is the friction coefficient of the transfer roller. As a result, there is an effect that it is possible to prevent the registration deviation of the leading end of the transfer paper as much as possible due to the magnitude relationship of the friction coefficient with respect to the transfer paper.
【0028】請求項6に係る画像形成装置は、転写ロー
ラの研磨目方向を転写紙の進入方向と同方向にしたこと
により、転写紙の先端が転写ローラに引っ掛かってニッ
プ部に到達しないような不送りジャムを防止することが
できるという効果がある。In the image forming apparatus according to the sixth aspect of the present invention, since the direction of the grain of the transfer roller is set in the same direction as the direction of entry of the transfer paper, the leading end of the transfer paper is caught by the transfer roller and does not reach the nip portion. This has the effect of preventing undelivered jams.
【図1】本発明に係る画像形成装置の一実施例の要部を
示す断面図である。FIG. 1 is a sectional view showing a main part of an embodiment of an image forming apparatus according to the present invention.
【図2】図1の実施例におけるニップ部への転写紙先端
の到達状態を示す図である。FIG. 2 is a diagram showing how the leading edge of the transfer paper reaches the nip portion in the embodiment of FIG.
【図3】図1の実施例におけるニップ部への転写紙先端
の到達状態を示す図である。3 is a diagram showing how the leading edge of the transfer paper reaches the nip portion in the embodiment of FIG.
【図4】図1の実施例における転写紙検知手段の位置と
ニップ部の距離及び書き込みまたは露光位置とニップ部
の距離の関係を示す図である。FIG. 4 is a diagram showing a relationship between a position of a transfer sheet detection unit and a distance of a nip portion and a writing or exposure position and a distance of a nip portion in the embodiment of FIG.
【図5】図1の実施例の各部動作のタイミングを示す図
である。5 is a diagram showing the timing of the operation of each part of the embodiment of FIG.
【図6】図1の実施例における感光体の摩擦係数、転写
紙の摩擦係数、転写ローラの摩擦係数の関係を示す図で
ある。FIG. 6 is a diagram showing a relationship among a friction coefficient of a photoconductor, a friction coefficient of a transfer sheet, and a friction coefficient of a transfer roller in the embodiment of FIG.
【図7】転写ローラの研磨目方向と転写紙の進入方向と
の関係を示す図である。FIG. 7 is a diagram showing a relationship between a polishing grain direction of a transfer roller and an approach direction of a transfer sheet.
【図8】感光体と転写ローラのニップ部に転写紙の先端
が接触する状態の図である。FIG. 8 is a diagram showing a state in which the leading end of the transfer paper is in contact with the nip portion between the photoconductor and the transfer roller.
【図9】従来の画像形成装置を示す断面図である。FIG. 9 is a sectional view showing a conventional image forming apparatus.
1 感光体 2 帯電器 3 光学ユニット 4 現像ユニット 5a 転写ローラ 6 クリーニングブレード 7 クリーニングユニット 8 給紙ユニット 9 給紙コロ 10 中間ローラ 11 搬送ローラ 12 ガイド部 13 転写紙検知手段 14 ガイド部材 P 転写紙 N 感光体と転写ローラのニップ部 L 書き込みまたは露光用のレーザ光 1 Photoconductor 2 Charging Device 3 Optical Unit 4 Developing Unit 5a Transfer Roller 6 Cleaning Blade 7 Cleaning Unit 8 Paper Feeding Unit 9 Paper Feeding Roller 10 Intermediate Roller 11 Conveying Roller 12 Guide Part 13 Transfer Paper Detecting Means 14 Guide Member P Transfer Paper N Nip portion between photoconductor and transfer roller L Laser light for writing or exposure
Claims (6)
写紙検知手段を含み、転写紙を上記感光体と上記転写ロ
一ラのニップ部にたるむよう突き当て、所定のタイミン
グで上記搬送ローラを一旦停止させ、この時上記転写ロ
ーラを停止させるようにしたことを特徴とする画像形成
装置。1. A photosensitive member, a transfer roller, a conveying roller, and a transfer paper detecting means are provided, and the transfer paper is abutted against the nip portion of the photosensitive member and the transfer roller so as to sag, and the transfer paper is conveyed at a predetermined timing. An image forming apparatus characterized in that a roller is once stopped, and at this time, the transfer roller is stopped.
接触しないようにするガイド部材を設けたことを特徴と
する請求項1の画像形成装置。2. The image forming apparatus according to claim 1, further comprising a guide member for preventing the slack portion of the transfer paper from coming into contact with the photosensitive member.
記感光体と上記転写ローラのニップ部の距離Llと、書
き込みまたは露光位置と上記ニップ部の距離L2を、L
l>L2となるようにしたことを特徴とする請求項1ま
たは2の画像形成装置。3. A distance L1 between the detection position of the transfer paper detecting means, the nip portion of the photoconductor and the transfer roller, and a distance L2 between the writing or exposure position and the nip portion are L
3. The image forming apparatus according to claim 1, wherein l> L2.
の線速Vk以上となるようにしたことを特徴とする請求
項1ないし3のいずれかに記載の画像形成装置。4. The image forming apparatus according to claim 1, wherein the linear velocity Vr of the conveying roller is set to be equal to or higher than the linear velocity Vk of the photoconductor.
の摩擦係数μp、上記転写ローラの摩擦係数μrが、μ
k<μp<μrとなるようにしたことを特徴とする5. The friction coefficient μk of the photoconductor, the friction coefficient μp of the transfer paper, and the friction coefficient μr of the transfer roller are μ
It is characterized in that k <μp <μr.
進入方向と同方向にしたことを特徴とする請求項1ない
し5のいずれかに記載の画像形成装置。6. The image forming apparatus according to claim 1, wherein the transfer grain direction of the transfer roller is set in the same direction as the transfer paper entering direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30976894A JP3454946B2 (en) | 1994-11-17 | 1994-11-17 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30976894A JP3454946B2 (en) | 1994-11-17 | 1994-11-17 | Image forming device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08146685A true JPH08146685A (en) | 1996-06-07 |
JP3454946B2 JP3454946B2 (en) | 2003-10-06 |
Family
ID=17997033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30976894A Expired - Fee Related JP3454946B2 (en) | 1994-11-17 | 1994-11-17 | Image forming device |
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Country | Link |
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JP (1) | JP3454946B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002311790A (en) * | 2001-04-12 | 2002-10-25 | Canon Inc | Image forming apparatus |
JP2009237472A (en) * | 2008-03-28 | 2009-10-15 | Oki Data Corp | Image forming apparatus |
JP2011039480A (en) * | 2009-07-16 | 2011-02-24 | Ricoh Co Ltd | Image forming apparatus |
CN102707606A (en) * | 2011-03-28 | 2012-10-03 | 富士施乐株式会社 | Image forming apparatus |
-
1994
- 1994-11-17 JP JP30976894A patent/JP3454946B2/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002311790A (en) * | 2001-04-12 | 2002-10-25 | Canon Inc | Image forming apparatus |
JP2009237472A (en) * | 2008-03-28 | 2009-10-15 | Oki Data Corp | Image forming apparatus |
JP4598099B2 (en) * | 2008-03-28 | 2010-12-15 | 株式会社沖データ | Image forming apparatus |
JP2011039480A (en) * | 2009-07-16 | 2011-02-24 | Ricoh Co Ltd | Image forming apparatus |
CN102707606A (en) * | 2011-03-28 | 2012-10-03 | 富士施乐株式会社 | Image forming apparatus |
JP2012203379A (en) * | 2011-03-28 | 2012-10-22 | Fuji Xerox Co Ltd | Image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP3454946B2 (en) | 2003-10-06 |
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