JPH07334018A - Control method of image forming device - Google Patents
Control method of image forming deviceInfo
- Publication number
- JPH07334018A JPH07334018A JP6152755A JP15275594A JPH07334018A JP H07334018 A JPH07334018 A JP H07334018A JP 6152755 A JP6152755 A JP 6152755A JP 15275594 A JP15275594 A JP 15275594A JP H07334018 A JPH07334018 A JP H07334018A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- recording medium
- image
- voltage
- image forming
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は転写方式の画像形成装置
の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a transfer type image forming apparatus.
【０００２】より詳しくは、電子写真感光体・静電記録
誘電体・磁気記録磁性体等の像担持体の表面に電子写真
プロセス・静電記録プロセス・磁気記録プロセス等の適
宜の作像原理・方式で形成担持させた目的の画像情報の
トナー像等の可転写像を、像担持体の転写部位に給紙部
から給送した紙・プラスチックシート等の記録媒体（転
写材）に対して該記録媒体の背面から電荷を付与して静
電転写させる転写手段により転写させて画像形成物（コ
ピー・プリント）を出力する、複写機・プリンタ・ファ
クシミリなどの画像形成装置の制御方法に関する。More specifically, an appropriate image forming principle such as an electrophotographic process, an electrostatic recording process, a magnetic recording process, etc. is formed on the surface of an image carrier such as an electrophotographic photosensitive member, an electrostatic recording dielectric, a magnetic recording magnetic body, or the like. A transferable image such as a toner image of the target image information formed and carried by the method is transferred to a recording medium (transfer material) such as paper or a plastic sheet fed from the paper feeding unit to the transfer portion of the image carrier. The present invention relates to a control method for an image forming apparatus such as a copying machine, a printer, or a facsimile, which transfers an image formed product (copy / print) by transferring it from a back surface of a recording medium by electrostatically transferring it.
【０００３】[0003]
【従来の技術】静電転写手段としては、転写ローラや転
写ベルト等の転写用回転体を像担持体に当接させ、その
当接ニップ部である転写部位に記録媒体を給送し、記録
媒体の転写部位通過時に転写手段としての転写用回転体
に一定の電圧（転写電圧）を印加して記録媒体の背面か
ら電荷を付与して像担持体表面側の可転写像を記録媒体
表面側に静電転写させる接触転写方式がある。2. Description of the Related Art As an electrostatic transfer means, a transfer rotary member such as a transfer roller or a transfer belt is brought into contact with an image carrier, and a recording medium is fed to a transfer portion, which is a contact nip portion, for recording. A constant voltage (transfer voltage) is applied to the transfer rotating body as a transfer means when the medium passes through the transfer portion, and charges are applied from the back surface of the recording medium to form a transferable image on the surface side of the image carrier on the side of the recording medium. There is a contact transfer method that electrostatically transfers to.
【０００４】またコロナ放電器を用い、転写部位に給送
された記録媒体の背面に電荷を付与して像担持体表面側
の可転写像を記録媒体表面側へ静電転写させるものもあ
る。記録媒体は背面に電荷が付与されることで像担持体
表面に密着する。There is also a method in which a corona discharger is used to apply an electric charge to the back surface of the recording medium fed to the transfer portion to electrostatically transfer the transferable image on the surface side of the image carrier to the surface side of the recording medium. The back surface of the recording medium adheres to the surface of the image carrier by being charged with electric charges.
【０００５】[0005]
【発明が解決しようとする課題】転写手段として上述の
ような静電転写手段を用いた転写式画像形成装置におい
ては、転写部位に給送された記録媒体の後端が該記録媒
体を転写部位に導びく記録媒体案内部材を越えたとき、
該記録媒体後端側の支えがなくなるので、特に記録媒体
がカールしているときなどには記録媒体が像担持体から
離れてしまい、更に転写効率を上げるために設定転写電
流が大きいと、記録媒体が像担持体と接する前に像担持
体上の可転写像が記録媒体側へ飛翔して転写され、転写
画像の劣化（飛び散り）が生じやすいという問題があっ
た。In the transfer type image forming apparatus using the electrostatic transfer means as described above as the transfer means, the trailing end of the recording medium fed to the transfer portion is transferred to the transfer portion. When the recording medium guiding member that leads to
Since there is no support on the trailing edge side of the recording medium, the recording medium is separated from the image carrier especially when the recording medium is curled, and if the set transfer current is large in order to further improve the transfer efficiency, the recording is performed. There is a problem that the transferable image on the image carrier flies to the recording medium side and is transferred before the medium comes into contact with the image carrier, and deterioration (scattering) of the transferred image easily occurs.
【０００６】そこで本発明はこの問題を解消することを
目的とする。Therefore, the present invention aims to solve this problem.
【０００７】[0007]
【課題を解決するための手段】本発明は、像担持体表面
に形成された可転写像を、該像担持体の転写部位に給紙
部から給送した記録媒体に対して該記録媒体の背面から
電荷を付与して静電転写させる転写手段により転写させ
る画像形成装置において、転写部位へ給送された記録媒
体の後端が該記録媒体を転写部位に導びく記録媒体案内
部材を越えたら前記転写手段に印加する電圧を記録媒体
が前記記録媒体案内部材に接触しているときに前記転写
手段に印加する電圧よりも小さくすることを特徴とする
画像形成装置の制御方法、である。SUMMARY OF THE INVENTION According to the present invention, a transferable image formed on the surface of an image bearing member is transferred to a transfer portion of the image bearing member from a paper feeding unit with respect to the recording medium. In an image forming apparatus in which charges are transferred from the back surface to be transferred by electrostatic transfer means, if the trailing edge of the recording medium fed to the transfer site exceeds a recording medium guide member that guides the recording medium to the transfer site. A method of controlling an image forming apparatus, wherein the voltage applied to the transfer unit is smaller than the voltage applied to the transfer unit when the recording medium is in contact with the recording medium guide member.
【０００８】[0008]
【作用】転写部位へ給送された記録媒体の後端が該記録
媒体を転写部位に導びく記録媒体案内部材を越えたら転
写手段に印加する電圧を記録媒体が記録媒体案内部材に
接触しているときに転写手段に印加する電圧よりも小さ
くすることにより、転写電流が減ることで像担持体から
記録媒体への可転写像の飛び散り現象が緩和される。こ
の場合転写効率は減少するけれども、転写部位へ給送さ
れた記録媒体の後端が記録媒体を転写部位に導びく記録
媒体案内部材を越えてからの上記の転写手段に印加する
電圧の下げ具合を、可転写像の飛び散り現象の緩和と実
用上支障のない転写効率がえられる範囲のものに設定す
ることで、記録媒体の先端から後端まで全域において飛
び散りの少ない良好な転写が行なえる。When the trailing edge of the recording medium fed to the transfer portion exceeds the recording medium guide member that guides the recording medium to the transfer portion, the recording medium contacts the recording medium guide member with a voltage applied to the transfer means. By making the voltage lower than the voltage applied to the transfer means during the transfer, the transfer current is reduced and the scattering phenomenon of the transferable image from the image carrier to the recording medium is alleviated. In this case, the transfer efficiency is reduced, but the voltage applied to the transfer means is lowered after the trailing edge of the recording medium fed to the transfer site passes over the recording medium guide member that guides the recording medium to the transfer site. Is set in a range in which the scattering phenomenon of the transferable image is alleviated and the transfer efficiency can be obtained without any practical problems, and good transfer can be performed with little scattering in the entire area from the leading edge to the trailing edge of the recording medium.
【０００９】[0009]
〈実施例１〉（図１〜図３） 図１に静電転写式の画像形成装置の一例の概略構成を示
した。本例装置は電子写真プロセス利用の複写機であ
る。<Embodiment 1> (FIGS. 1 to 3) FIG. 1 shows a schematic configuration of an example of an electrostatic transfer image forming apparatus. The apparatus of this example is a copying machine using an electrophotographic process.
【００１０】（１）装置の概略構成 １は像担持体としての回転ドラム型の電子写真感光体で
ある。本例はプロセススピード９０ｍｍ／ｓｅｃで矢示
Ｘの時計方向に回転駆動される直径２４ｍｍのＯＰＣ感
光体である。(1) Schematic Configuration of Apparatus 1 is a rotating drum type electrophotographic photosensitive member as an image bearing member. This example is an OPC photosensitive member having a diameter of 24 mm which is rotationally driven in the clockwise direction indicated by the arrow X at a process speed of 90 mm / sec.
【００１１】この感光体１はその回転過程で一次帯電手
段としての接触帯電ローラ２により所定の極性・電位に
一様に帯電処理される。本例は負帯電処理である。この
一次帯電手段はコロナ放電器とすることもできる。In the course of its rotation, the photosensitive member 1 is uniformly charged to a predetermined polarity and potential by the contact charging roller 2 as the primary charging means. This example is a negative charging process. This primary charging means can also be a corona discharger.
【００１２】次いで回転感光体１の帯電処理面に対して
露光部位において不図示の画像露光手段により例えば原
稿像の露光３がなされることで露光像に対応した静電潜
像が形成される。Next, an electrostatic latent image corresponding to the exposed image is formed by exposing, for example, an original image to the charged surface of the rotary photosensitive member 1 by an image exposing means (not shown) at the exposed portion.
【００１３】その静電潜像が現像部位において現像器４
の正帯電トナーにより正規現像されてトナー像として現
像される。The electrostatic latent image is developed at the developing portion by the developing device 4.
The toner is normally developed with the positively charged toner of No. 1 to be developed as a toner image.
【００１４】一方、不図示の給紙部から記録媒体として
の転写材Ｐが給送され、感光体１の表面に形成担持され
たトナー像の先端が感光体１の回転に伴なって、感光体
１とこれに圧接させた転写用回転体としての転写ローラ
５との圧接ニップ部である転写部位Ｎに到達したとき、
転写材Ｐの先端も丁度転写部位Ｎに到達するレジストタ
イミングをもって転写材Ｐがレジストローラ対６から転
写前案内部材７を通して転写部位Ｎへ給送される。転写
前案内部材７は転写材Ｐを転写部位Ｎへ導びく役目をす
る。On the other hand, a transfer material P as a recording medium is fed from a paper feeding unit (not shown), and the tip of the toner image formed and carried on the surface of the photoconductor 1 is exposed as the photoconductor 1 rotates. When the transfer portion N, which is a pressure contact nip portion between the body 1 and the transfer roller 5 as a transfer rotary member pressed against the body 1, reaches
The transfer material P is also fed from the registration roller pair 6 to the transfer site N through the pre-transfer guide member 7 at the registration timing when the tip of the transfer material P also reaches the transfer site N. The pre-transfer guide member 7 serves to guide the transfer material P to the transfer site N.
【００１５】また転写材Ｐの先端の転写部位Ｎへの到達
とともに転写ローラ５に対して負の転写バイアスが印加
され、転写材Ｐは転写部位Ｎを挟持搬送されて通過して
いく過程でその背面から電荷が付与され感光体１表面の
トナー像が転写材Ｐの表面側に順次に静電転写される。When the tip of the transfer material P reaches the transfer portion N, a negative transfer bias is applied to the transfer roller 5, and the transfer material P is nipped and conveyed in the transfer portion N in the process of passing. The toner image on the surface of the photoreceptor 1 is sequentially electrostatically transferred to the surface side of the transfer material P by being charged with electric charges from the back surface.
【００１６】転写部位Ｎを通った転写材Ｐは感光体１面
から分離され、不図示の定着手段へ搬送されて転写トナ
ー像の定着処理を受ける。The transfer material P which has passed through the transfer portion N is separated from the surface of the photosensitive member 1 and is conveyed to a fixing means (not shown) to be subjected to a fixing process of the transferred toner image.
【００１７】転写材Ｐへのトナー像転写後の感光体１面
はクリーニング器８によって転写残りトナー等の残留汚
染物の除去がなされて清掃され、繰り返して作像に供さ
れる。After the toner image is transferred onto the transfer material P, the surface of the photoreceptor 1 is cleaned by a cleaning device 8 to remove residual contaminants such as residual toner after transfer, and is repeatedly used for image formation.
【００１８】（２）制御（図２・図３） 図２は転写電流と転写効率の相関図、図３は制御シーケ
ンス図である。(2) Control (FIGS. 2 and 3) FIG. 2 is a correlation diagram of transfer current and transfer efficiency, and FIG. 3 is a control sequence diagram.
【００１９】ａ）転写ローラ５に対しては、先に出願さ
れた特願昭６３−２７６１０６号に示す定電圧制御、定
電流制御（ATVC,Active Transfer Voltage Controlとい
う）可能な電源９によって、夫々所定の時点で所定の電
圧を印加するようになっているものとする。A) For the transfer roller 5, a power source 9 capable of constant voltage control and constant current control (referred to as ATVC, Active Transfer Voltage Control) shown in Japanese Patent Application No. 63-276106 previously filed is used. It is assumed that a predetermined voltage is applied at a predetermined time point.
【００２０】ｂ）ＣＰＵ１０はコピーオンの信号を受け
ると、感光体１を駆動するモータードライブ回路（不図
示）にメインモータの駆動オン信号を送り、同時に電源
９に一次高圧オン信号を送って帯電ローラ２に帯電バイ
アスを印加して感光体１表面をたとえば暗電位Ｖｄ−７
００Ｖに帯電させるものとする。B) When the CPU 10 receives a copy-on signal, it sends a drive-on signal for the main motor to a motor drive circuit (not shown) for driving the photoconductor 1, and at the same time sends a primary high-voltage on-signal to the power source 9 for charging. A charging bias is applied to the roller 2 so that the surface of the photoconductor 1 is dark potential Vd-7, for example.
It shall be charged to 00V.
【００２１】ついでＣＰＵ１０が不図示の原稿露光手段
を駆動させて静電潜像を形成する。Then, the CPU 10 drives an original exposing means (not shown) to form an electrostatic latent image.
【００２２】ｃ）次に、ＣＰＵ１０が電源９に転写定電
流制御（Ｔ．Ｃ．Ｃ）、転写定電圧制御（Ｔ．Ｖ．Ｃ
）、転写定電圧制御（Ｔ．Ｖ．Ｃ）の信号を送
り、これによって後述するような定電流、定電圧制御が
実行される。C) Next, the CPU 10 controls the power source 9 to transfer constant current control (TCC) and transfer constant voltage control (TVC).
), A signal for transfer constant voltage control (T.V.C.) is sent, and thereby constant current and constant voltage control as described later is executed.
【００２３】ｄ）転写部位Ｎにおいて転写材Ｐが存在し
ない非転写時において電源９はまずＴ．Ｃ．Ｃ信号を受
けると、転写ローラ５に流す電流を定電流制御する。本
実施例においては、５μＡの電流を流すものとする。D) When the transfer material P is not present at the transfer site N, the power source 9 first turns on the T.S. C. When the C signal is received, the current flowing through the transfer roller 5 is controlled to a constant current. In this embodiment, a current of 5 μA is passed.
【００２４】ｅ）次に転写部位Ｎに転写材Ｐが搬送され
てくると電源９は、１枚目の転写材の先端で、Ｔ．Ｖ．
Ｃ信号を受けることにより、定電流制御時に生じた電
圧Ｖ１を記憶して定電流制御を停止して記憶した電圧Ｖ
１に下記のようにあらかじめ決められた電圧ａを加えた
電圧（Ｖ１＋ａ）を転写ローラに印加して定電圧制御を
行う。E) Next, when the transfer material P is conveyed to the transfer portion N, the power source 9 moves to the T.S.T. V.
By receiving the C signal, the voltage V1 generated during the constant current control is stored and the constant current control is stopped to store the stored voltage V1.
A constant voltage control is performed by applying a voltage (V1 + a) obtained by adding a predetermined voltage a to 1 to the transfer roller as described below.
【００２５】このタイミングは転写部位Ｎより転写材搬
送方向上流側の転写材搬送路中に転写材検知センサ１１
を設置し、この信号をＣＰＵ１０に送ることにより搬送
転写材Ｐの先端位置を検知してＣＰＵ１０により制御す
ることが可能である。At this timing, the transfer material detecting sensor 11 is provided in the transfer material conveying path upstream of the transfer portion N in the transfer material conveying direction.
Is installed and by sending this signal to the CPU 10, it is possible to detect the front end position of the transfer material P and control it by the CPU 10.
【００２６】ここで電圧ａは次のように決められるもの
である。図２は転写電流と転写効率の関係を表す。また
転写電流が１５μＡ以上のとき飛び散りが生じるとす
る。あらゆる転写材で転写効率が９０％以上になり、飛
び散りが生じないようにしたい。従って、転写ローラ５
に電圧（Ｖ１＋ａ）を印加したとき転写電流が最も小さ
いとき、すなわち転写材が乾いた厚紙のとき転写電流が
４μＡより大きくなるように、かつ転写電流が最も大き
いとき、すなわち転写材が吸湿した紙のとき転写電流が
１５μＡより小さくなるように電圧ａの値は決められ
る。本装置で用いられる転写ローラにおいては、Ｖ１が
２〜４ＫＶとなる抵抗値のローラを用いており、このよ
うな転写ローラではａ＝１．５ＫＶである。Here, the voltage a is determined as follows. FIG. 2 shows the relationship between transfer current and transfer efficiency. Further, it is assumed that scattering occurs when the transfer current is 15 μA or more. We want to make sure that the transfer efficiency of all transfer materials is 90% or more and that no scattering occurs. Therefore, the transfer roller 5
When the transfer current is the smallest when the voltage (V1 + a) is applied to the sheet, that is, the transfer current is larger than 4 μA when the transfer material is a dry thick paper, and when the transfer current is the largest, that is, when the transfer material absorbs moisture. At this time, the value of voltage a is determined so that the transfer current becomes smaller than 15 μA. The transfer roller used in this apparatus uses a roller having a resistance value of V1 of 2 to 4 KV, and such a transfer roller has a = 1.5 KV.
【００２７】ｆ）次に電源９は転写材Ｐの後端が転写前
案内部材７を越える（抜ける）と、Ｔ．Ｖ．Ｃ信号を
受け、先に記憶した電圧Ｖ１に下記のようにあらかじめ
決められた電圧ｂを加えた電圧（Ｖ１＋ｂ）を転写ロー
ラ５に印加して定電圧制御を行なう。F) Next, when the trailing edge of the transfer material P crosses (disengages) from the pre-transfer guide member 7, the power source 9 turns on the T.I. V. Upon receiving the C signal, a voltage (V1 + b) obtained by adding a predetermined voltage b to the previously stored voltage V1 is applied to the transfer roller 5 to perform constant voltage control.
【００２８】このタイミングは前記転写材検知センサ１
１の信号をＣＰＵ１０に送ることにより転写材Ｐの後端
位置を検知してＣＰＵ１０により制御することが可能で
ある。This timing corresponds to the transfer material detection sensor 1
By sending the signal 1 to the CPU 10, the rear end position of the transfer material P can be detected and controlled by the CPU 10.
【００２９】ここで転写材Ｐの後端が転写前案内部材７
を越えてから転写部位Ｎを抜けるまでの時間を転写電圧
切換時間と呼ぶ。Here, the trailing edge of the transfer material P is the pre-transfer guide member 7.
The time from when the voltage exceeds the value to when it passes through the transfer portion N is called the transfer voltage switching time.
【００３０】上記電圧ｂは次のように決められるもので
ある。転写電流と転写効率の関係は前述図２のようにな
っており、転写材Ｐの後端が転写前案内部材７を越える
と転写電流が８μＡ以上のとき飛び散りが生じるとす
る。あらゆる転写材で飛び散りが生じないようにした
い。そのために転写効率は少し下がってしまうが、転写
効率は８０％以上にしたい。The voltage b is determined as follows. The relationship between the transfer current and the transfer efficiency is as shown in FIG. 2, and it is assumed that when the trailing edge of the transfer material P exceeds the pre-transfer guide member 7, scattering occurs when the transfer current is 8 μA or more. I want to prevent scattering on all transfer materials. Therefore, the transfer efficiency is slightly lowered, but the transfer efficiency is desired to be 80% or more.
【００３１】従って、転写ローラに電圧（Ｖ１＋ｂ）を
印加したとき転写電流が最も小さいとき、すなわち転写
材が乾いた厚紙のとき転写電流が２μＡより大きくなる
ように、かつ転写電流が最も大きいとき、すなわち転写
材が吸湿した紙のとき転写電流が８μＡより小さくなる
ように、電圧ｂの値は決められる。本装置ではｂ＝０．
５ＫＶである。Therefore, when the transfer current is the smallest when the voltage (V1 + b) is applied to the transfer roller, that is, when the transfer material is a dry thick paper, the transfer current is larger than 2 μA and the transfer current is the largest, That is, the value of the voltage b is determined so that the transfer current is less than 8 μA when the transfer material is a paper that has absorbed moisture. In this device, b = 0.
It is 5 KV.
【００３２】ｇ）つぎに１枚目の転写材Ｐの後端が転写
部位Ｎを抜けると、電源９はＴ．Ｃ．Ｃ信号を受け、再
び５μＡの定電流制御を行なう。以後、２枚目の転写材
からは上述シーケンスを繰り返し行なう。G) Next, when the trailing edge of the first transfer material P passes through the transfer site N, the power source 9 turns on the T.S. C. Upon receiving the C signal, the constant current control of 5 μA is performed again. After that, the above sequence is repeated from the second transfer material.
【００３３】このようにすることで、転写材の先端から
後端まで全域において飛び散りの少ない良好な転写が行
なえる。By doing so, good transfer with little scattering can be performed in the entire area from the front end to the rear end of the transfer material.
【００３４】〈実施例２〉（図４） 本実施例の画像形成装置は前述実施例１の図１の装置と
ほぼ同じ構成であるが、本実施例の装置の場合は転写前
案内部材７については転写材搬送方向Ｙの下流側に所定
の幅Ｗの切り欠き部７ａを入れてある構成となってい
る。また装置へ導入される転写材の幅を検知する手段
（不図示）を備えている。<Embodiment 2> (FIG. 4) The image forming apparatus of this embodiment has substantially the same structure as the apparatus of FIG. 1 of Embodiment 1 described above, but in the case of the apparatus of this embodiment, the pre-transfer guide member 7 is used. With respect to No. 7, a cutout portion 7a having a predetermined width W is formed on the downstream side in the transfer material transport direction Y. Further, a means (not shown) for detecting the width of the transfer material introduced into the apparatus is provided.
【００３５】上記切り欠き部７ａの幅Ｗは官製はがきの
幅より大きく、Ｂ５サイズのコピー用紙の幅よりも小さ
いような寸法になっていて、装置へ通紙された官製はが
きは上記転写前案内部材７の切り欠き部７ａの幅Ｗの間
を通って転写部位Ｎへ案内される。The width W of the cutout portion 7a is larger than the width of the officially made postcard and smaller than the width of the B5 size copy paper, and the officially made postcard passed to the apparatus is the pre-transfer guide. It is guided to the transfer site N through the width W of the cutout portion 7a of the member 7.
【００３６】官製はがきのように厚いしかも幅の小さい
紙にトナー像を転写したいとき、切り欠きのない案内部
材７の場合、案内部材７が感光体１に近いと転写材の転
写部位Ｎへの進入が阻止されたり、画像の部分的欠落が
生じることがある。When it is desired to transfer a toner image to a thick paper having a small width such as a postcard manufactured by an official company, in the case of the guide member 7 having no notch, when the guide member 7 is close to the photosensitive member 1, the transfer material is transferred to the transfer portion N of the transfer material. Intrusion may be blocked or partial image loss may occur.
【００３７】そこで、本実施例のような案内部材７を用
いることで、官製はがきのような厚いしかも幅の小さい
紙にトナー像を転写しようとする場合、案内部材７の切
り欠きの部分７ａが感光体１から離れているので、転写
材の転写部位Ｎへの進入が容易になり、トナー像の転写
不良が低減される。Therefore, when the toner image is to be transferred to a thick paper having a small width such as a postcard by using the guide member 7 as in the present embodiment, the cutout portion 7a of the guide member 7 is not formed. Since it is separated from the photoconductor 1, the transfer material can easily enter the transfer portion N, and defective transfer of the toner image can be reduced.
【００３８】本実施例のような案内部材７を用いること
により、幅がＷ以下の転写材と、幅がＷより大きい転写
材とで、転写材が案内部材７を抜けるタイミングが異な
る。したがって本実施例では、不図示の転写材幅検知手
段の信号をＣＰＵ１０（図１）に送ることにより、あら
かじめ転写材の幅を検知して、ＣＰＵ１０が転写材の幅
に応じて電源９にＴ．Ｖ．Ｃの信号を送るタイミング
を変える。By using the guide member 7 as in this embodiment, the transfer material having a width of W or less and the transfer material having a width larger than W have different timings at which the transfer material leaves the guide member 7. Therefore, in the present embodiment, the width of the transfer material is detected in advance by sending a signal from the transfer material width detecting means (not shown) to the CPU 10 (FIG. 1), and the CPU 10 sends the power to the power source 9 according to the width of the transfer material. ． V. Change the timing of sending the C signal.
【００３９】上記以外は前記実施例１と同様である。Other than the above, it is the same as the first embodiment.
【００４０】このようにすることで、本実施例のように
転写前案内部材７に切り欠き部７ａがある場合でも、前
記実施例１と同じような効果が得られる。なお、静電転
写手段はコロナ放電器であってもよい。By doing so, even in the case where the pre-transfer guide member 7 has the cutout portion 7a as in the present embodiment, the same effect as in the first embodiment can be obtained. The electrostatic transfer means may be a corona discharger.
【００４１】[0041]
【発明の効果】以上説明したように本発明によれば、静
電転写手段を用いた転写式画像形成装置において、転写
部位へ給送された記録媒体の後端が該記録媒体を転写部
位に導びく記録媒体案内部材を越えたときに生じやすい
転写画像の飛び散り劣化をなくする、もしくは軽減化す
ることができ、転写効率が良く、かつ飛び散りの少ない
良好な転写が行なえる効果がある。As described above, according to the present invention, in the transfer type image forming apparatus using the electrostatic transfer means, the trailing end of the recording medium fed to the transfer portion is the recording medium as the transfer portion. It is possible to eliminate or reduce the scattering deterioration of the transferred image, which is likely to occur when the recording medium guiding member that guides the recording medium is passed, and it is possible to achieve good transfer efficiency and good transfer with less scattering.
【図１】 実施例１の画像形成装置の概略構成図FIG. 1 is a schematic configuration diagram of an image forming apparatus according to a first embodiment.
【図２】 転写電流と転写効率の相関図FIG. 2 Correlation diagram of transfer current and transfer efficiency
【図３】 装置の制御シーケンス図FIG. 3 is a control sequence diagram of the device.
【図４】 実施例２の画像形成装置の転写前案内部材の
平面図FIG. 4 is a plan view of a pre-transfer guide member of the image forming apparatus according to the second embodiment.
１ 像担持体（回転ドラム型の電子写真感光体） ２ 一次帯電手段（帯電ローラ） ３ 画像露光光 ４ 現像器 ５ 静電転写手段（転写ローラ） Ｎ 転写部位 Ｐ 記録媒体（転写材） ６ レジストローラ ７ 転写前案内部材 ７ａ 切り欠き部 Ｗ 切り欠き部の幅 ９ 電源 ８ クリーニング器 １０ ＣＰＵ １１ 転写材検知センサ 1 image carrier (rotary drum type electrophotographic photoreceptor) 2 primary charging means (charging roller) 3 image exposure light 4 developing device 5 electrostatic transfer means (transfer roller) N transfer site P recording medium (transfer material) 6 resist Roller 7 Pre-transfer guide member 7a Cutout W Width of cutout 9 Power supply 8 Cleaning device 10 CPU 11 Transfer material detection sensor
Claims (1)
該像担持体の転写部位に給紙部から給送した記録媒体に
対して該記録媒体の背面から電荷を付与して静電転写さ
せる転写手段により転写させる画像形成装置において、 転写部位へ給送された記録媒体の後端が該記録媒体を転
写部位に導びく記録媒体案内部材を越えたら前記転写手
段に印加する電圧を記録媒体が前記記録媒体案内部材に
接触しているときに前記転写手段に印加する電圧よりも
小さくすることを特徴とする画像形成装置の制御方法。1. A transferable image formed on the surface of an image carrier,
In an image forming apparatus for transferring a recording medium fed from a paper feeding unit to a transfer portion of the image carrier by a transfer means for electrostatically transferring by applying a charge from the back surface of the recording medium, the recording medium is fed to the transfer portion. When the trailing edge of the recorded medium exceeds the recording medium guide member that guides the recording medium to the transfer portion, the transfer means applies the voltage applied to the transfer means when the recording medium is in contact with the recording medium guide member. A method for controlling an image forming apparatus, wherein the voltage is made smaller than the voltage applied to the image forming apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6152755A JPH07334018A (en) | 1994-06-10 | 1994-06-10 | Control method of image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6152755A JPH07334018A (en) | 1994-06-10 | 1994-06-10 | Control method of image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07334018A true JPH07334018A (en) | 1995-12-22 |
Family
ID=15547462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6152755A Pending JPH07334018A (en) | 1994-06-10 | 1994-06-10 | Control method of image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07334018A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004170968A (en) * | 2002-11-08 | 2004-06-17 | Canon Inc | Image forming apparatus |
| JP2016009116A (en) * | 2014-06-25 | 2016-01-18 | 株式会社リコー | Image forming apparatus |
| US9348267B2 (en) | 2014-05-21 | 2016-05-24 | Canon Kabushiki Kaisha | Image forming apparatus |
| JP2017009996A (en) * | 2015-06-24 | 2017-01-12 | 京セラドキュメントソリューションズ株式会社 | Image formation device and image formation method |
| US10324400B2 (en) | 2017-02-10 | 2019-06-18 | Canon Kabushiki Kaisha | Image forming apparatus |
-
1994
- 1994-06-10 JP JP6152755A patent/JPH07334018A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004170968A (en) * | 2002-11-08 | 2004-06-17 | Canon Inc | Image forming apparatus |
| JP4532879B2 (en) * | 2002-11-08 | 2010-08-25 | キヤノン株式会社 | Image forming apparatus |
| US9348267B2 (en) | 2014-05-21 | 2016-05-24 | Canon Kabushiki Kaisha | Image forming apparatus |
| JP2016009116A (en) * | 2014-06-25 | 2016-01-18 | 株式会社リコー | Image forming apparatus |
| JP2017009996A (en) * | 2015-06-24 | 2017-01-12 | 京セラドキュメントソリューションズ株式会社 | Image formation device and image formation method |
| CN106444325A (en) * | 2015-06-24 | 2017-02-22 | 京瓷办公信息***株式会社 | Image forming apparatus and image forming method |
| CN106444325B (en) * | 2015-06-24 | 2019-03-15 | 京瓷办公信息***株式会社 | Image forming apparatus and image forming method |
| US10324400B2 (en) | 2017-02-10 | 2019-06-18 | Canon Kabushiki Kaisha | Image forming apparatus |
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