JPH04166876A - Electrophotographic device - Google Patents
Electrophotographic deviceInfo
- Publication number
- JPH04166876A JPH04166876A JP2293408A JP29340890A JPH04166876A JP H04166876 A JPH04166876 A JP H04166876A JP 2293408 A JP2293408 A JP 2293408A JP 29340890 A JP29340890 A JP 29340890A JP H04166876 A JPH04166876 A JP H04166876A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- heater
- moisture content
- paper
- sensor
- 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
- 108091008695 photoreceptors Proteins 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000003384 imaging method Methods 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、レーザを用いた、プリンタ・複写機・ファ
クシミリなど、電子写真方式（感光体に形成した画像を
用紙や封筒などの記録媒体に転写して記録を行う方式）
により記録媒体に記録を行う電子写真装置に関する。[Detailed Description of the Invention] Industrial Application Field This invention is applicable to electrophotographic devices such as printers, copiers, and facsimiles that use a laser to transfer an image formed on a photoreceptor to a recording medium such as paper or an envelope. method of recording)
The present invention relates to an electrophotographic apparatus that performs recording on a recording medium.
従来の技術
従来、この種の電子写真装置では、たとえば第３図に示
すように給紙路上を通して感光体２と転写器３との間に
記録媒体４を搬送し、その記録媒体４を感光体２に密着
させた状態でその背面からコロナ放電により電界を与え
ることにより、該感光体２の表面に付着しているトナー
画像を記録媒体４に転移させて転写し、その後、定着器
５で熱・定着して記録を行っていた。2. Description of the Related Art Conventionally, in this type of electrophotographic apparatus, a recording medium 4 is conveyed between a photoreceptor 2 and a transfer device 3 through a paper feed path, and the recording medium 4 is transferred to the photoreceptor. The toner image adhering to the surface of the photoreceptor 2 is transferred and transferred to the recording medium 4 by applying an electric field by corona discharge from the back side of the photoreceptor 2 while the photoreceptor 2 is in close contact with the photoreceptor 2.・Standing and recording.
発明が解決しようとする課題
しかしながら、従来のこの種の電子写真装置では、高湿
環境下、記録媒体の含水分が多い場合、コロナ放電によ
る記録媒体への電荷は、記録媒体内で電荷が分解してし
まうので、前記感光体上のトナー層に対面している記録
媒体上の電荷密度が小さくなり、転写効率が低下する。Problems to be Solved by the Invention However, in conventional electrophotographic apparatuses of this type, when the recording medium has a high moisture content in a high humidity environment, the charge on the recording medium due to corona discharge is decomposed within the recording medium. As a result, the charge density on the recording medium facing the toner layer on the photoreceptor decreases, and the transfer efficiency decreases.
その結果、前記１−す−層の記録媒体への転移が悪くな
り、感光体上の残留トナーが多くなるため、画像品質が
低下する問題があった。As a result, the transfer of the 1-st layer to the recording medium becomes poor and the amount of residual toner on the photoreceptor increases, resulting in a problem of deterioration of image quality.
そこで、この発明の目的は、高湿環境下における転写効
率の低下を防ぎ、画像品質の低下を防止することにある
。Therefore, an object of the present invention is to prevent a decrease in transfer efficiency and to prevent a decrease in image quality in a high humidity environment.
課題を 決するための手段
上記目的を達成するために、請求項１に記載の発明は、
給紙路を通して記録媒体を搬送し、その記録媒体に転写
器で感光体上の画像を転写して記録を行う電子写真装置
において、前記給紙路に、前記記録媒体を加熱するヒー
タを備えてなる、ことを特徴とする。Means for Solving the Problem In order to achieve the above object, the invention according to claim 1:
In an electrophotographic apparatus that conveys a recording medium through a paper feed path and performs recording by transferring an image on a photoreceptor to the recording medium using a transfer device, the paper feed path includes a heater that heats the recording medium. It is characterized by becoming.
また請求項２に記載の発明は、請求項１に記載の発明に
おいて前記感光体の回転にタイミングを合わせて前記記
録媒体を送り出すレジストローラに前記ヒータを内蔵し
てなる、ことを特徴とする。The invention according to claim 2 is characterized in that in the invention according to claim 1, the heater is built into a registration roller that sends out the recording medium in synchronization with the rotation of the photoreceptor.
さらに、請求項３に記載の発明は、請求項１に記載の発
明において、前記給紙路に送り込む前記記録媒体の収納
部に、湿度センサを備えるとともにその湿度センサの出
力に応じて前記ヒータをコントロールする制御手段を備
えてなることを特徴とする。Furthermore, the invention according to claim 3 is the invention according to claim 1, in which a humidity sensor is provided in the storage section for the recording medium fed into the paper feed path, and the heater is controlled in accordance with the output of the humidity sensor. It is characterized by comprising a control means for controlling.
さらに、請求項４に記載の発明は、請求項１に記載の発
明において、前記給紙路に送り込む前記記録媒体の収納
部に、その記録媒体の含水分を測定する含水分センサを
備えるとともにその含水分センサの出力に応じて前記ヒ
ータをコントロールする制御手段を備えてなることを特
徴とする。Furthermore, the invention according to claim 4 is the invention according to claim 1, in which a storage section for the recording medium fed into the paper feed path is provided with a moisture content sensor for measuring the moisture content of the recording medium. It is characterized by comprising a control means for controlling the heater according to the output of the moisture content sensor.
さらに、請求項５に記載の発明は、請求項１に３一
記載の発明において、前記ヒータの下流側に、その記録
媒体の含水分を測定する含水分センサを備えてなること
を特徴とする。Furthermore, the invention according to claim 5 is the invention according to claim 1 or 31, characterized in that a moisture content sensor for measuring the moisture content of the recording medium is provided downstream of the heater. .
走−一朋
そして、請求項１に記載の発明では、給紙路を通す記録
媒体をヒータで加熱する。According to the first aspect of the invention, the recording medium passing through the paper feed path is heated by a heater.
また、請求項２に記載の発明では、レジストローラ対で
記録媒体を感光体の回転にタイミングを合わせて送り出
しながら加熱する。Further, in the invention as set forth in claim 2, the recording medium is heated while being fed by the pair of registration rollers in synchronization with the rotation of the photoreceptor.
さらに、請求項３に記載の発明では、収納部の湿度に応
じてヒータをコントロールする。Furthermore, in the invention according to claim 3, the heater is controlled according to the humidity of the storage section.
さらにまた、請求項４に記載の発明では、記録媒体の含
水分に応じてヒータをコントロールする。Furthermore, in the invention according to claim 4, the heater is controlled according to the moisture content of the recording medium.
さらに、請求項５に記載の発明では、加熱後の記録媒体
の含水分を測定する。Furthermore, in the invention described in claim 5, the moisture content of the recording medium after heating is measured.
実施例
以下、図面を参照しつつ、この発明の実施例について説
明する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は、この発明の一実施例であるレーザプリンタで
、その内部機構の全体構成概略図である。FIG. 1 is a schematic diagram of the overall structure of the internal mechanism of a laser printer which is an embodiment of the present invention.
図中符号１０で示すものは、装置本体である。その装置
本体１０は、不構造体１０ａと不構造体１ｏｂとで構成
し、第２図に示すように、その不構造体１０ａを不構造
体１０ｂに軸１１によって開閉自在に取り付ける。該装
置本体１０内には、はぼ中央にベルト状の感光体１２を
設ける。What is indicated by the reference numeral 10 in the figure is the main body of the apparatus. The device main body 10 is composed of an unstructured body 10a and an unstructured body 1ob, and as shown in FIG. 2, the unstructured body 10a is attached to the unstructured body 10b by a shaft 11 so as to be openable and closable. Inside the main body 10 of the apparatus, a belt-shaped photoreceptor 12 is provided at the center.
その感光体１２のまわりには、第１図中矢印で示す駆動
方向に順に、帯電器１３、現像器１４、転写器１５、ク
リーニング器１６を配置する。そして、前記帯電器１３
およびクリーニング器１６の上側には光書込み器１７を
配置し、前記転写器１５の下側には給紙カセット１８を
配置する。その給紙カセット１８は、収納部２８に着脱
自在に収納する。A charging device 13, a developing device 14, a transfer device 15, and a cleaning device 16 are arranged around the photoreceptor 12 in the driving direction indicated by the arrow in FIG. Then, the charger 13
An optical writer 17 is arranged above the cleaning device 16, and a paper feed cassette 18 is arranged below the transfer device 15. The paper feed cassette 18 is detachably stored in the storage section 28.
しかして、その給紙カセット１８から給紙ローラ１９に
よって矢印Ａ方向に給送された用紙（記録媒体）２０は
、レジストローラ対２１によってタイミングをとられて
感光体１２の下側に搬送される。感光体１２は、矢示す
るように時計方向に駆動し、その際、帯電器１３によっ
て表面を−様に帯電し、光書込み器１７からのレーザ光
りを照射して感光体１２上に静電潜像を形成する。この
潜像は、現像器１４を通るときトナーによって可視像化
する。そして、この可視像は、感光体１２の下側に搬送
されてきた用紙２０の上面に転写器１５により転写する
。その転写した用紙２０は搬送ガイド２２で案内して定
着器２３の加熱ローラ２４と加圧ローラ２５との間に搬
送し、可視像を定着する。そして、定着器２３を出た用
紙２０は、さらに排紙ローラ２６によって搬送して矢印
Ｂ方向またはＣ方向へと排出する。他方、可視像転写後
の感光体１２は、クリーニング器１６で残留トナーを除
去し、その後除電器２７で除電する。The paper (recording medium) 20 fed from the paper feed cassette 18 in the direction of arrow A by the paper feed roller 19 is conveyed to the lower side of the photoreceptor 12 by a pair of registration rollers 21 at the right timing. . The photoreceptor 12 is driven clockwise as shown by the arrow, and at this time, the surface is charged in a negative manner by a charger 13, and a laser beam from an optical writer 17 is irradiated to create an electrostatic charge on the photoreceptor 12. Form a latent image. This latent image is made visible by toner when it passes through the developer 14. Then, this visible image is transferred by the transfer device 15 onto the upper surface of the paper 20 that has been conveyed to the lower side of the photoreceptor 12. The transferred paper 20 is guided by a conveyance guide 22 and conveyed between a heating roller 24 and a pressure roller 25 of a fixing device 23, and the visible image is fixed thereon. Then, the paper 20 that has left the fixing device 23 is further conveyed by a paper discharge roller 26 and discharged in the direction of arrow B or C. On the other hand, after the visible image has been transferred to the photoreceptor 12, residual toner is removed by a cleaning device 16, and then static electricity is removed by a static eliminator 27.
ところで、上述したレーザプリンタでは、前記レジスト
ローラ対２１を構成するローラ２１ａ・２１ｂの少なく
とも一方のローラ２１ａにヒータ３０を内蔵する。前記
ヒータ３０の下流側には、通紙する用紙２０に接触して
その含水分を検知する含水分センサ３１を設ける。一方
、用紙２０を収納する前記収納部２８内には、湿度セン
サ３２を取り付ける。それら湿度センサ３２、含水分セ
ンサ３１、およびヒータ３０は、装置本体１０内に収納
する図示しない制御手段にそれぞれ接続する。By the way, in the above-mentioned laser printer, a heater 30 is built into at least one of the rollers 21a and 21b constituting the pair of registration rollers 21. A moisture content sensor 31 is provided on the downstream side of the heater 30 to detect the moisture content of the paper 20 by contacting it. On the other hand, a humidity sensor 32 is installed inside the storage section 28 that stores the paper 20. The humidity sensor 32, moisture content sensor 31, and heater 30 are each connected to a control means (not shown) housed within the device main body 10.
しかして、前記収納部２８内の湿度を前記湿度センサ３
２で検知し、その出力に応じて前記制御手段によりヒー
タ３０を所定温度にコントロールする。他方、前記給紙
ローラ１９を回動して給紙トレイ１８から用紙２０を送
り出し、給紙路３３を矢印六方向に搬送して前記レジス
トローラ対２１に突き当て、感光体１２の回転にタイミ
ングを合せて送り出しながら加熱する。そして、含水分
センサ３１で調湿後の含水分を検知して後、感光体１２
と転写器１５の間へと搬送する。そうして、−枚通紙す
るまでは、湿度センサ３２によりヒータ３０を所定温度
にコントロールするが、通紙後は、含水分センサ３１か
らの出力に応じてヒータ３０をフィードバックコントロ
ールし、以後の通紙に備える。前記含水分センサ３１で
検知するとき、用紙２０の搬送を止めれば測定データの
精度＝７＝
を上げることができる。Therefore, the humidity inside the storage section 28 is detected by the humidity sensor 3.
2, and the heater 30 is controlled to a predetermined temperature by the control means according to the output. On the other hand, the paper feed roller 19 is rotated to send out the paper 20 from the paper feed tray 18, and the paper 20 is conveyed along the paper feed path 33 in the six directions of the arrows and hits the registration roller pair 21, so that the timing of the rotation of the photoreceptor 12 is adjusted. Heat the mixture while sending it out. After the moisture content sensor 31 detects the moisture content after humidity adjustment, the photoreceptor 12
and the transfer device 15. Then, the heater 30 is controlled to a predetermined temperature by the humidity sensor 32 until -sheets are passed, but after the paper is passed, the heater 30 is feedback-controlled according to the output from the moisture content sensor 31, and the subsequent Prepare for paper passing. When the moisture content sensor 31 detects moisture content, the accuracy of the measurement data can be increased by 7 by stopping the conveyance of the paper 20.
なお、上述した実施例では、湿度センサ３２と含水分セ
ンサ３１の双方を備える構成としたが、この発明では、
湿度センサ３２または含水分センサ３１を個別に備えて
独立して使用する構成としてもよい。Note that in the above-described embodiment, the configuration includes both the humidity sensor 32 and the moisture content sensor 31, but in this invention,
A configuration may also be adopted in which the humidity sensor 32 or the moisture content sensor 31 is individually provided and used independently.
また、上述した実施例では、前記給紙路３３に送り込む
前記用紙２０の収納部２８に、湿度センサ３２を備える
とともに、その湿度センサ３２の出力に応じて前記ヒー
タ３０をコントロールする制御手段を備える構成とした
。しかし、この発明では、図示省略したが前記収納部２
８に前記湿度センサ３２に代えて含水分センサを設ける
構成としてもよい。そして、含水分センサを収納部２８
内の最上部の用紙２０に接触してその用紙２０の含水分
を測定し、その出力に応じて制御手段によリヒータ３ｏ
を所定の温度にコントロールする。Further, in the embodiment described above, the storage section 28 for the paper 20 fed into the paper feed path 33 is provided with a humidity sensor 32 and a control means for controlling the heater 30 according to the output of the humidity sensor 32. The structure is as follows. However, in this invention, although not shown, the storage section 2
8 may be provided with a moisture content sensor instead of the humidity sensor 32. Then, the moisture content sensor is placed in the storage section 28.
The moisture content of the paper 20 is measured by contacting the paper 20 at the top of the paper 20, and the reheater 3o is controlled by the control means according to the output.
to a predetermined temperature.
発明の効果
以上のことから、請求項１に記載の発明に係る電子写真
装置によれば、記録媒体をヒータで加熱して後転写器へ
と搬送するので、高湿環境下においてもその記録媒体の
含水分を少なくでき、転写効率の低下を防いで画像品質
の低下を防止することができる。Effects of the Invention According to the electrophotographic apparatus according to the invention as set forth in claim 1, since the recording medium is heated by the heater and then conveyed to the transfer device, the recording medium remains stable even in a high humidity environment. It is possible to reduce the moisture content of the image forming apparatus, prevent a decrease in transfer efficiency, and prevent a decrease in image quality.
また、請求項２に記載の発明に係る電子写真装置によれ
ば、レジストローラ対の少なくとも一方のローラにヒー
タを内蔵する構成なので、ヒータの設置スペースが不要
となり、部品点数を削減することができる。Further, according to the electrophotographic apparatus according to the invention described in claim 2, since the heater is built into at least one of the pair of registration rollers, no space is required for installing the heater, and the number of parts can be reduced. .
さらに、請求項３乃至５に記載の発明に係る電子写真装
置によれば、センサの出力に応じてヒータをコントロー
ルするので、記録媒体の含水分率を常に良好に保つこと
ができる。Further, according to the electrophotographic apparatus according to the third to fifth aspects of the invention, since the heater is controlled according to the output of the sensor, the moisture content of the recording medium can always be maintained at a good level.
さらにまた、請求項４に記載の発明に係る電子写真装置
によれば、記録媒体の含水分を直接測定するので、測定
データの精度か上がりヒータを精度良くコントロールす
ることができる。Furthermore, according to the electrophotographic apparatus according to the fourth aspect of the present invention, since the water content of the recording medium is directly measured, the accuracy of the measurement data can be increased and the heater can be controlled with high accuracy.
さらにまた、請求項５に記載の発明に係る電子写真装置
によれば、加熱後の記録媒体の含水分を測定するので、
フィードバック制御が可能となり、ヒータを精度良くコ
ントロールすることができる。Furthermore, according to the electrophotographic apparatus according to the invention set forth in claim 5, since the moisture content of the recording medium after heating is measured,
Feedback control becomes possible and the heater can be controlled with high precision.
第１図はこの発明の一実施例であるレーザプリンタの内
部機構の全体概略構成図、第２図はその上構造体を開い
た状態図、第３図は従来のレーザプリンタにおける内部
機構の全体概略構成図である。
１０・・・・・・・・装置本体、１２・・・・・・・・
・感光体、１５・・・・・・・・・転写器、２０・・・
・・・・・・用紙（記録媒体）、２８・・・・・・・収
納部、３０・・・・・・ヒータ、３１・・・・・・・含
水分センサ、３２・・・・・・・湿度センサ、３３・・
・・・・・・・給紙路。Fig. 1 is an overall schematic configuration diagram of the internal mechanism of a laser printer that is an embodiment of the present invention, Fig. 2 is a diagram of the structure in an open state, and Fig. 3 is an overall diagram of the internal mechanism of a conventional laser printer. It is a schematic block diagram. 10・・・・・・・Device body, 12・・・・・・・・・
・Photoreceptor, 15... Transfer device, 20...
...Paper (recording medium), 28 ... Storage section, 30 ... Heater, 31 ... Moisture content sensor, 32 ...・・Humidity sensor, 33・・
・・・・・・Paper feed path.
Claims (1)
転写器で感光体上の画像を転写して記録を行う電子写真
装置において、前記給紙路に、前記記録媒体を加熱する
ヒータを備えてなる、電子写真装置。 ２、前記感光体の回転にタイミングを合わせて前記記録
媒体を送り出すレジストローラに前記ヒータを内蔵して
なる、請求項１に記載の電子写真装置。 ３、前記給紙路に送り込む前記記録媒体の収納部に、湿
度センサを備えるとともにその湿度センサの出力に応じ
て前記ヒータをコントロールする制御手段を備えてなる
、請求項１に記載の電子写真装置。 ４、前記給紙路に送り込む前記記録媒体の収納部に、そ
の記録媒体の含水分を測定する含水分センサを備えると
ともにその含水分センサの出力に応じて前記ヒータをコ
ントロールする制御手段を備えてなる、請求項１に記載
の電子写真装置。 ５、前記ヒータの下流側に、その記録媒体の含水分を測
定する含水分センサを備えてなる、請求項１に記載の電
子写真装置。[Scope of Claims] 1. In an electrophotographic apparatus in which a recording medium is conveyed through a paper feed path and an image on a photoreceptor is transferred to the recording medium by a transfer device to perform recording, the recording medium is conveyed in the paper feed path. An electrophotographic device equipped with a heater that heats a medium. 2. The electrophotographic apparatus according to claim 1, wherein the heater is built into a registration roller that feeds out the recording medium in synchronization with the rotation of the photoreceptor. 3. The electrophotographic apparatus according to claim 1, further comprising a humidity sensor in a storage section for the recording medium fed into the paper feed path, and a control means for controlling the heater according to the output of the humidity sensor. . 4. A storage section for the recording medium fed into the paper feed path is provided with a moisture content sensor for measuring the moisture content of the recording medium, and a control means for controlling the heater according to the output of the moisture content sensor. The electrophotographic apparatus according to claim 1. 5. The electrophotographic apparatus according to claim 1, further comprising a moisture content sensor for measuring moisture content of the recording medium downstream of the heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2293408A JP3011753B2 (en) | 1990-10-30 | 1990-10-30 | Electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2293408A JP3011753B2 (en) | 1990-10-30 | 1990-10-30 | Electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04166876A true JPH04166876A (en) | 1992-06-12 |
| JP3011753B2 JP3011753B2 (en) | 2000-02-21 |
Family
ID=17794386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2293408A Expired - Fee Related JP3011753B2 (en) | 1990-10-30 | 1990-10-30 | Electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3011753B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064619A (en) * | 2006-09-07 | 2008-03-21 | Ricoh Co Ltd | Moisture quantity measuring structure and image forming apparatus using the same |
| US9152358B2 (en) | 2011-08-29 | 2015-10-06 | Brother Kogyo Kabushiki Kaisha | Printer, print processing program, and print processing method |
-
1990
- 1990-10-30 JP JP2293408A patent/JP3011753B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064619A (en) * | 2006-09-07 | 2008-03-21 | Ricoh Co Ltd | Moisture quantity measuring structure and image forming apparatus using the same |
| US9152358B2 (en) | 2011-08-29 | 2015-10-06 | Brother Kogyo Kabushiki Kaisha | Printer, print processing program, and print processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3011753B2 (en) | 2000-02-21 |
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