JPS5830774A - Copying device - Google Patents
Copying deviceInfo
- Publication number
- JPS5830774A JPS5830774A JP12852981A JP12852981A JPS5830774A JP S5830774 A JPS5830774 A JP S5830774A JP 12852981 A JP12852981 A JP 12852981A JP 12852981 A JP12852981 A JP 12852981A JP S5830774 A JPS5830774 A JP S5830774A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- paper
- high voltage
- developing bias
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6532—Removing a copy sheet form a xerographic drum, band or plate
- G03G15/6535—Removing a copy sheet form a xerographic drum, band or plate using electrostatic means, e.g. a separating corona
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は感光体上に帯電、露光、現像および転写の各プ
ロセスを行なって、転写記録紙に原稿画像を複写する電
子複写機のごとき複写装置に関するもので、特に感光体
からの転写紙の分離性能を向上させるようにしたもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus such as an electronic copying machine that performs charging, exposure, development, and transfer processes on a photoreceptor to copy an original image onto transfer recording paper. This improves the separation performance of the transfer paper from the body.
電子写真方式の複写プロセスについて、第１図を参照し
て説明する。感光体６の表面はコロナ帯電器６により一
様に帯電される。感光体６がセレン感光体である場合は
、帯電極性はプラスであり、帯電表面電位は’ｙｏｏｖ
位で使用される。複写原稿１は露光ラング２によジ照射
され、複写レンズ４により感光体６上に原稿の画像が結
像される。The electrophotographic copying process will be explained with reference to FIG. The surface of the photoreceptor 6 is uniformly charged by the corona charger 6. When the photoreceptor 6 is a selenium photoreceptor, the charged polarity is positive and the charged surface potential is 'yoov'.
used in rank. A copy original 1 is irradiated by an exposure rung 2, and an image of the original is formed on a photoreceptor 6 by a copy lens 4.
この画像露光により、感光体θ上に静電潜像が形成され
る。この静電潜像は現像器７によりトナーで現像され、
転写帯電器１０によシ転写記録紙９（以下、紙と呼ぶ）
に転写される。紙９は紙搬送ベルト１了により定着器（
図示せず）ｔで搬送されて定着される。ここで、転写帯
電器１ｏにより感光体６上のトナー像を紙９に転写する
場合、紙９の裏面が帯電されるため、紙９が感光体６に
強く静電吸着する。このだめ紙９を感光体６から分離す
る必要がある。This image exposure forms an electrostatic latent image on the photoreceptor θ. This electrostatic latent image is developed with toner by a developing device 7,
A transfer recording paper 9 (hereinafter referred to as paper) is transferred to the transfer charger 10.
transcribed into. The paper 9 is transferred to the fixing device (
(not shown) is transported and fixed at t. Here, when the toner image on the photoconductor 6 is transferred to the paper 9 by the transfer charger 1o, the back surface of the paper 9 is charged, so that the paper 9 is strongly electrostatically attracted to the photoconductor 6. It is necessary to separate this waste paper 9 from the photoreceptor 6.
従来、転写された紙の分離方法としては、交流コロナ帯
電器を使用して紙を除電し、紙の剛性ならびに自重を利
用して分離する方法が採られている。このような交流コ
ロナ帯電器による分離方法においては、転写帯電器によ
り紙に帯電された電荷を分離帯電器で除電してやればよ
い。紙の表面電位を０〜１００ｖに除電してやれば、後
は紙の剛性ならびに自重で分離し得る。分離帯電器の高
圧電圧を変えた場合の実験結果を第２図に示す。Conventionally, as a method for separating transferred paper, a method has been adopted in which electricity is removed from the paper using an AC corona charger and separation is performed using the rigidity and weight of the paper. In such a separation method using an AC corona charger, the charge charged on the paper by the transfer charger may be removed by the separation charger. If the surface potential of the paper is neutralized to 0 to 100V, the paper can be separated by its rigidity and weight. Figure 2 shows the experimental results when the high voltage of the separation charger was changed.
原稿画像が白の場合は、図にハツチングで示す分離可能
１ Ｋ 圧範囲１ｄ、 ４．９ＫＶ ＡＣ〜６．９ Ｋ
ＶＡＣとなる。この電圧より低い場合は紙の上の残留電
荷により感光体に静電吸着して分離不良となｐ、逆に高
い場合は交流コロナ帯電器は負のコロナ電流が大きいた
め、紙が逆帯電して再び感光体に静電吸着してしまう。If the original image is white, separable 1K pressure range 1d, 4.9KV AC to 6.9K shown by hatching in the figure.
It becomes VAC. If the voltage is lower than this, the residual charge on the paper will electrostatically attract the photoreceptor, resulting in poor separation.Conversely, if it is higher, the AC corona charger will have a large negative corona current, so the paper will be reversely charged. Then, it is electrostatically attracted to the photoreceptor again.
一方、画像が黒の場合は分離可能な電圧範囲ば４． Ｉ
ＫＶＡｃ〜５． ｉ ＫＶＡｃとなった。On the other hand, if the image is black, the separable voltage range is 4. I
KVAc~5. i KVAc.
画像によって分離電圧が異なる原因は次のように考えら
れる。画像が黒の場合は感光体上に電荷が残り、トナー
が現像されているので、転写帯電器による紙と感光体と
の間の静電吸着力は画像が白の場合より、も小さい。画
像が白の場合は感光体上の電荷は無くなり、転写帯電器
により紙に帯電される電荷の量が大きくなる。分離性能
が悪い原因の一つがここにある。The reason why the separation voltage differs depending on the image is considered as follows. When the image is black, charges remain on the photoreceptor and the toner has been developed, so the electrostatic adsorption force between the paper and the photoreceptor due to the transfer charger is smaller than when the image is white. When the image is white, there is no charge on the photoreceptor, and the amount of charge charged on the paper by the transfer charger increases. This is one of the reasons for poor separation performance.
従来の交流コロナ帯電器による紙の分離では、画像が白
および黒でも分離可能な高圧電圧（実験ではＢＫＶＡｃ
付近）を選択していた。しかし、温度、湿度等の環境条
件によって分離帯電器のコロナ電流が変動するため、白
または黒の原稿画像によシ分離が不安定になっていた。When paper is separated using a conventional AC corona charger, a high voltage voltage (BKVAc in the experiment) that allows separation of white and black images is required.
nearby) was selected. However, because the corona current of the separation charger fluctuates depending on environmental conditions such as temperature and humidity, separation becomes unstable with white or black original images.
本発明は分離帯電器による分離構造を改善し、原稿画像
にかかわらず感光体に対する紙の分離を確実に行なうこ
とを目的としたものである。本発明は現像バイアス電源
の電流値によって画像の濃度を判定し、分離帯電器に印
加する高圧電源の電圧を変化させることを骨子としたも
のである。以下、第１図を参照して本発明の詳細な説明
する。An object of the present invention is to improve the separation structure using a separation charger and to reliably separate the paper from the photoreceptor regardless of the original image. The gist of the present invention is to determine the density of an image based on the current value of a developing bias power supply and to vary the voltage of a high voltage power supply applied to a separation charger. Hereinafter, the present invention will be explained in detail with reference to FIG.
感光体６は十分な露光照射後も残留電位が残る（セレン
感光体の場合はＳＯＶ位である）。この残留電位を打ち
消すために、現像バイアス電源８によシ、スリーブ式の
現像器７のスリーブには１００ｖ〜２００Ｖの現像バイ
アスがかかっている。現像する画像が黒の場合は第２図
に示すように、数μム〜１ｏμムのバイアス電流が流れ
る。The photoreceptor 6 has a residual potential remaining even after sufficient exposure (in the case of a selenium photoreceptor, it is around SOV). In order to cancel this residual potential, a developing bias voltage of 100 V to 200 V is applied to the sleeve of the sleeve type developing device 7 by the developing bias power supply 8. When the image to be developed is black, as shown in FIG. 2, a bias current of several .mu.m to 1 .mu.m flows.
この値は現像剤の種類によって変化する。このバイアス
電流を検出して分離用高圧電源の出力電圧を変える方法
の一例を次に説明する。なお、第３図は本装置のタイミ
ング図を示しており、Ｔ１は可変高圧電源１６のオン時
刻、１２〜丁５は画像先端部の現像時刻、Ｔ４は紙９の
先端部が分離帯電器１１を通過する時刻、Ｔ５は転写、
分離終了時刻を表わす。This value varies depending on the type of developer. An example of a method of detecting this bias current and changing the output voltage of the separation high-voltage power supply will be described below. In addition, FIG. 3 shows a timing diagram of this apparatus, where T1 is the ON time of the variable high voltage power supply 16, 12 to 5 are the development times of the leading edge of the image, and T4 is the time when the leading edge of the paper 9 is separated by the charger 11. T5 is the transfer time,
Indicates the separation end time.
第１図において、現像バイアス電源８に流れる電流は抵
抗Ｒで検出され、電圧−電流変換回路１４によりスイッ
チＳＷ１ を通してコンデンサＣを放電する。同時に充
電回路１５が働らいてコンデンサＣはスイッチＳＷ１を
通して充電されるので、コンデンサＣの電荷による電位
ＶＣは次式のようになる。In FIG. 1, the current flowing through the developing bias power supply 8 is detected by a resistor R, and the voltage-current conversion circuit 14 discharges a capacitor C through a switch SW1. At the same time, the charging circuit 15 operates and the capacitor C is charged through the switch SW1, so that the potential VC due to the charge on the capacitor C is expressed by the following equation.
Ｖｏ＝ １１０ Ｊ （ｉ（、−Ｋｉ） ｄｔＣ：コン
デンサＣの容量
１゜：充電電流
ｉ：現像バイアス電流
に：電圧−電流変換回路１４の定数
上式により現像バイアス電流によってコンデンサＣの電
圧ｖｃ が変わる。スイッチＳＷ１ およびＳＷ１′を
入れて、コンデンサＣを充電するタイミングは、ちょう
ど画像の先端部１ｏｍ〜３０慈を現像するタイミングＴ
２〜Ｔ５に同期を取っている。この電圧ｖｃに対応して
可変高圧電源１６の電圧ｖＨを変える。実験では画像が
白の場合は５．３ ＫＶＡＣｓ黒の場合は４．７ ＫＶ
ＡＣとなルヨうに回路を調整した。この値は紙９の先端
が分離帯電器１１を通過するまで保持される。紙９の先
端が分離されると、可変高圧電源１６の出力高圧電圧Ｖ
Ｈｉｉ： Ｖ ＨＯに下げる。この値は紙９が感光体６
から分離する時の放電や搬送中の機内との接触放電によ
り画像が乱れ論いための最低値の値である。Vo= 110 J (i(, -Ki) dtC: capacitance of capacitor C 1°: charging current i: developing bias current: constant of voltage-current conversion circuit 14 According to the above equation, voltage vc of capacitor C is changed by developing bias current. The timing to turn on the switches SW1 and SW1' and charge the capacitor C is exactly at the timing T when developing the leading edge of the image from 1 to 30 mm.
It is synchronized from 2 to T5. The voltage vH of the variable high voltage power supply 16 is changed in accordance with this voltage vc. In experiments, when the image is white, it is 5.3 KVACs, and when it is black, it is 4.7 KV.
I adjusted the circuit to match the AC. This value is held until the leading edge of the paper 9 passes through the separation charger 11. When the leading edge of the paper 9 is separated, the output high voltage V of the variable high voltage power supply 16
Hii: Lower to V HO. This value indicates that paper 9 is the photoconductor 6.
This is the minimum value because the image may be distorted due to discharge when separating from the machine or discharge when it comes into contact with the inside of the machine during transportation.
紙の先端が分離されれば、あとは紙の自重により分離が
行なわれる。ただし、紙９が感光体６の下方を通過する
声器構成とすることが必要である。Once the leading edge of the paper is separated, the rest is separated by the paper's own weight. However, it is necessary to adopt a voice structure in which the paper 9 passes below the photoreceptor 6.
電圧ｖＨｏにするタイミングＴ４は紙の寸法や重さ等に
よって最適な値が決まる。また、搬送ベルト１了が吸引
方式の搬送ベルトの場合は紙９の先端がベルトに吸引さ
れた時点で電圧ｋＶＨｏとしてもよい。The optimum timing T4 for setting the voltage vHo is determined depending on the size and weight of the paper. Further, if the conveyor belt 1 is a suction type conveyor belt, the voltage kVHo may be set at the time when the leading edge of the paper 9 is attracted to the belt.
紙の分離電圧をＷＨＯに下げる時間間隔は数１■ｍｓ
として、急激な電界変動が転写に影響を与えないように
する。以上に示したように、画像の白黒の判定を現像バ
イアスに流れる電流で行ない、分離帯電器に印加する電
圧を変えることによシ、安定した紙の分離が可能となる
。The time interval for lowering the paper separation voltage to WHO is several 1 ms.
to prevent sudden electric field fluctuations from affecting transfer. As described above, by determining whether an image is black or white using the current flowing through the developing bias and by changing the voltage applied to the separation charger, stable separation of paper becomes possible.
現像バイアス電流の値は現像の横幅寸法によって異なっ
てくる。すなわち、原稿画像の横幅によシミ流値が変わ
る。そこで実用的には、紙９のサイズを検出して、バイ
アス電流の積分値を変えるようにすればよい。前記式に
おいて紙サイズに対応してＫの値を変えることになる。The value of the developing bias current varies depending on the width of the developing area. That is, the stain flow value changes depending on the width of the original image. Therefore, in practice, the size of the paper 9 may be detected and the integral value of the bias current may be changed. In the above equation, the value of K is changed depending on the paper size.
また、現像剤の種類によっては、使用時間によって現像
バイアス電流が変化してくる。この場合はバイアス電流
の値を、あるスレッショールド電流値の上下を判定して
画像の白または黒を判定し、紙の分離電圧を対応する白
電圧または焦電圧の二値に設定する方が安定した分離が
可能である。例えば第２図より白電圧としてはａ ２
ＫＶＡＣ、焦電圧としては４．８ ＫＶＡＣが設定され
る。Further, depending on the type of developer, the developing bias current changes depending on the usage time. In this case, it is better to determine whether the bias current is above or below a certain threshold current value to determine whether the image is white or black, and then set the paper separation voltage to the corresponding binary value of white voltage or pyrovoltage. Stable separation is possible. For example, from Figure 2, the white voltage is a 2
KVAC and pyrovoltage are set at 4.8 KVAC.
紙分離用の可変高圧電源１６としては転写帯電器１０に
印加する電圧とは逆の極性をもった直流高圧電源を使用
して、紙の除電を行なうことも可能である。直流高圧電
源は交流電源に比べて小型、軽量で低価格で実現できる
。しかし、交流の紙分離用電源に比べて、紙をＯｖに除
電する分離可能電圧範囲が非常に狭くなる。したがって
本発明によシ、画像に対応して分離電圧を最適値に制御
してやれば、紙の感光体からの分離が安定となる。It is also possible to use a DC high voltage power source having a polarity opposite to the voltage applied to the transfer charger 10 as the variable high voltage power source 16 for paper separation to eliminate electricity from the paper. DC high-voltage power supplies are smaller, lighter, and less expensive than AC power supplies. However, compared to an AC power supply for paper separation, the voltage range in which paper can be separated to Ov is very narrow. Therefore, according to the present invention, if the separation voltage is controlled to an optimum value depending on the image, the separation of paper from the photoreceptor becomes stable.
なお、第１図において、３は反射ミラー、１２はクリー
ニング装置、１３は光除電器を表わす。In FIG. 1, 3 represents a reflecting mirror, 12 represents a cleaning device, and 13 represents an optical static eliminator.
以上のように本発明によれば分離帯電器による紙の分離
性能を向上させ得、原稿画像、環境条件等に影響されな
い安定した紙の分離を可能とするものである。As described above, according to the present invention, the paper separation performance of the separation charger can be improved, and stable paper separation can be performed without being affected by the original image, environmental conditions, etc.
第１図は本発明の実施例を示す概略図、第２図は原稿画
像によって現像バイアス電流および分離帯電器による分
離可能電圧範囲を示す実験値を示した図、第３図は本発
明の実施例のタイミング図である。
１・・・・・・複写原稿、５・・−・・・コロナ帯電器
、６・・・・・・感光体、７・・・・・・現像器、８・
・・・・・現像バイアス電源、９・・・・・・紙、１０
・・・・・・転写帯電器、１１・・・・・・分離帯電器
、１４・・パ・・電圧−電流変換回路、１５・・・・・
・充電回路、１６・・・・・・可変高圧電源、Ｃ・・・
・・・コンデンサ、Ｒ・・・・・・抵抗。FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing experimental values showing the developing bias current and the separable voltage range by the separation charger depending on the original image, and FIG. 3 is a diagram showing the implementation of the present invention. FIG. 3 is an example timing diagram. 1...Copy original, 5...Corona charger, 6...Photoreceptor, 7...Developer, 8...
...Development bias power supply, 9...Paper, 10
...Transfer charger, 11...Separation charger, 14...Pa voltage-current conversion circuit, 15...
・Charging circuit, 16...Variable high voltage power supply, C...
...Capacitor, R...Resistance.
Claims (1)
行なった後、分離帯電器により転写紙の分離を行なう電
子写真方式の複写装置であって、現像器にバイアス電圧
を与えるためのバイアス電源に流れる電流を検出する電
流検出手段と、その電流検出手段の出力に応じて前記分
離帯電器に印加する電圧を変化させ得る可変高圧電源を
具備し、前記電流検出手段にて画像の先端部の現像時に
おける現像バイアス電流を検出し、その現像バイアス電
流値に対応して前記高圧電源の出力電圧を変化させ、転
写紙の先端部が前記分離帯電器を通過するまで、前記出
力電圧を所定電圧値に保持し、一定時間経過後に前記出
力電圧を規定値まで下げるように構成したことを特徴と
する複写装置。 （→ 特許請求の範囲第（１）項において、前記電流検
出手段は前記現像バイアス電源の電流を積分する積分手
段を有し、その積分手段による電流の積分値を転写紙の
サイズに対応して変化させるようにしたことを特徴とす
る複写装置。 （３）特許請求の範囲第（１）項において、前記現像バ
イアス電流値を基準値に対して上下の２値に判別して、
可変高圧電源の出力電圧を選択して設定するようにした
ことを特徴とする複写装置。 （４）特許請求の範囲第０）項において、前記可変高圧
電源は転写帯電器と逆の極性をもった直流高圧電源であ
ることを特徴とする複写装置。[Scope of Claims] (1) An electrophotographic copying apparatus that separates transfer paper using a separation charger after performing charging, exposure, development, and transfer processes on a photoreceptor; The current detecting means includes a current detecting means for detecting a current flowing through a bias power supply for applying a bias voltage, and a variable high voltage power supply capable of changing the voltage applied to the separation charger according to the output of the current detecting means, and the current detecting means A developing bias current at the time of developing the leading edge of the image is detected by a means, and the output voltage of the high voltage power supply is changed in accordance with the developing bias current value, so that the leading edge of the transfer paper passes through the separation charger. A copying apparatus characterized in that the output voltage is maintained at a predetermined voltage value until then, and the output voltage is lowered to a predetermined value after a certain period of time has elapsed. (→ In claim (1), the current detecting means has an integrating means for integrating the current of the developing bias power supply, and calculates the integrated value of the current by the integrating means in accordance with the size of the transfer paper. (3) According to claim (1), the developing bias current value is determined into two values, upper and lower with respect to a reference value,
A copying apparatus characterized in that the output voltage of a variable high voltage power supply is selected and set. (4) The copying apparatus according to claim 0, wherein the variable high voltage power source is a DC high voltage power source having a polarity opposite to that of the transfer charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12852981A JPS5830774A (en) | 1981-08-17 | 1981-08-17 | Copying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12852981A JPS5830774A (en) | 1981-08-17 | 1981-08-17 | Copying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5830774A true JPS5830774A (en) | 1983-02-23 |
Family
ID=14986998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12852981A Pending JPS5830774A (en) | 1981-08-17 | 1981-08-17 | Copying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5830774A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59148077A (en) * | 1983-02-14 | 1984-08-24 | Mita Ind Co Ltd | Destaticization separating device for copy paper |
| JPS6225523A (en) * | 1985-07-25 | 1987-02-03 | Nec Corp | Radio communication system |
| JP2000181291A (en) * | 1998-12-15 | 2000-06-30 | Canon Inc | Image forming device |
| JP2003098837A (en) * | 2001-09-26 | 2003-04-04 | Kyocera Mita Corp | Image forming apparatus |
| CN108073060A (en) * | 2016-11-15 | 2018-05-25 | 富士施乐株式会社 | Image forming apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56104363A (en) * | 1980-01-22 | 1981-08-20 | Minolta Camera Co Ltd | Transfer paper separating device in powder image transfer type electrophotographic copier |
-
1981
- 1981-08-17 JP JP12852981A patent/JPS5830774A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56104363A (en) * | 1980-01-22 | 1981-08-20 | Minolta Camera Co Ltd | Transfer paper separating device in powder image transfer type electrophotographic copier |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59148077A (en) * | 1983-02-14 | 1984-08-24 | Mita Ind Co Ltd | Destaticization separating device for copy paper |
| JPS6225523A (en) * | 1985-07-25 | 1987-02-03 | Nec Corp | Radio communication system |
| JP2000181291A (en) * | 1998-12-15 | 2000-06-30 | Canon Inc | Image forming device |
| JP2003098837A (en) * | 2001-09-26 | 2003-04-04 | Kyocera Mita Corp | Image forming apparatus |
| CN108073060A (en) * | 2016-11-15 | 2018-05-25 | 富士施乐株式会社 | Image forming apparatus |
| CN108073060B (en) * | 2016-11-15 | 2022-06-24 | 富士胶片商业创新有限公司 | Image forming apparatus with a toner supply unit |
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