JPH0419675A - Image forming device of wet developing system - Google Patents
Image forming device of wet developing systemInfo
- Publication number
- JPH0419675A JPH0419675A JP2123942A JP12394290A JPH0419675A JP H0419675 A JPH0419675 A JP H0419675A JP 2123942 A JP2123942 A JP 2123942A JP 12394290 A JP12394290 A JP 12394290A JP H0419675 A JPH0419675 A JP H0419675A
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Links
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 230000001186 cumulative effect Effects 0.000 claims description 9
- 238000011161 development Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 5
- 108091008695 photoreceptors Proteins 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Wet Developing In Electrophotography (AREA)
- 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〕
本発明は、湿式現像方式を採用した複写機、プリンター
、ファクシミリ等の画像形成装置に係り、詳しくは、像
担持体の一様帯電器の出力を累積コピー枚数等に応じて
制御する湿式現像方式の画像形成装置に関するものであ
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image forming apparatus such as a copying machine, a printer, or a facsimile that employs a wet development method. The present invention relates to a wet development type image forming apparatus that controls output according to the cumulative number of copies and the like.
従来、液体現像剤に着色粒子であるトナーを分散させた
現像液を、−様帯電後に像露光されて、静電潜像が形成
された感光体等の像担持体表面に供給して、この静電潜
像を顕像化する湿式現像方式を採用した画像形成装置が
知られている。Conventionally, a developer in which toner, which is a colored particle, is dispersed in a liquid developer is supplied to the surface of an image carrier such as a photoconductor on which an electrostatic latent image is formed by imagewise exposure after -like charging. 2. Description of the Related Art An image forming apparatus that employs a wet development method to visualize an electrostatic latent image is known.
ところが、この湿式現像に用いられる現像液は、その温
度（以下、液温という）によって粘度が変化して、上記
静電潜像への付着量（以下、トナー付着量という）が変
化する。例えば、低温になり粘度が増す程、トナー付着
量が増加する。又、像担持体表面に供給された現像液は
、現像タンクに回収されて、再び像担持体表面に供給さ
れるというように、画像形成装置内で循環させて使用す
るので、次第に劣化して、トナー付着量が減少する。However, the viscosity of the developer used in this wet development changes depending on its temperature (hereinafter referred to as liquid temperature), and the amount of adhesion to the electrostatic latent image (hereinafter referred to as toner adhesion amount) changes. For example, as the temperature decreases and the viscosity increases, the amount of toner adhesion increases. In addition, since the developer supplied to the surface of the image carrier is circulated within the image forming apparatus, such as being collected in a developing tank and supplied to the surface of the image carrier again, it gradually deteriorates. , the amount of toner adhesion decreases.
このため、画像濃度、シャープネス、解像力などの画像
の品質がこれらに影響されて安定しないという問題点が
有った。For this reason, there has been a problem that image quality such as image density, sharpness, and resolution is affected by these factors and is unstable.
本発明は、従来技術の有するこのような問題点に鑑みな
されたものであり、その目的とするところは、液温や現
像液の使用量によらず、安定した品質の画像が得られる
湿式現像方式の画像形成装置を提供することである。The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a wet development method that allows images of stable quality to be obtained regardless of the solution temperature or the amount of developer used. An object of the present invention is to provide an image forming apparatus based on the above-mentioned method.
上記目的を達成するために、本発明は、湿式現像方式の
画像形成装置において、現像液の粘性を検出する手段と
、現像液の使用量を検出する手段と、像担持体の一様帯
電器の出力を現像液の粘性及び現像液使用量に応じて制
御する手段とを設けたことを特徴とするものである。第
１図は、本発明の機能ブロック図である。In order to achieve the above object, the present invention provides a wet development type image forming apparatus that includes a means for detecting the viscosity of a developer, a means for detecting the amount of developer used, and a uniform charging device for an image carrier. The invention is characterized in that it is provided with means for controlling the output of the developer according to the viscosity of the developer and the amount of developer used. FIG. 1 is a functional block diagram of the present invention.
上記のように構成された本発明は、現像液の粘性及び現
像液使用量に応じてトナー付着量が一定になるように像
担持体の一様帯−電器の出力を制御するように作用する
ものである。The present invention configured as described above operates to control the output of the uniform charging device of the image carrier so that the amount of toner adhesion is constant according to the viscosity of the developer and the amount of developer used. It is something.
［実施例］
本発明を画像形成装置である複写機に適用した実施例を
第２図乃至第９図に基づいて説明する。[Embodiment] An embodiment in which the present invention is applied to a copying machine, which is an image forming apparatus, will be described based on FIGS. 2 to 9.
先ず、複写機全体の概略について説明する。First, an overview of the entire copying machine will be explained.
第２図において、コンタクトガラス１上の原稿を照明装
置２で照射し、その反射光は走査ミラー３、レンズ４を
介し、−様帯電器であるコロナ放電器５で既に一様に帯
電されている潜像担持体であるドラム状の感光体６に結
像投影され、これにより感光体６上に静電潜像が形成さ
れる。この静電潜像は、感光体６の右側方に設けられた
現像装置７のトナーによりトナー像化され、このトナー
像は、図示しない給紙部から搬送されてきて、レジスト
ローラー８によってタイミングを取って感光体６表面に
搬送された転写紙に転写チャージャ９により転写される
。トナー像が転写された転写紙は、分離チャージャ１０
により感光体６から分離され、定着装置１１を通ってコ
ピー紙として機外に排出される。In FIG. 2, an original on a contact glass 1 is illuminated by an illumination device 2, and the reflected light passes through a scanning mirror 3 and a lens 4, and has already been uniformly charged by a corona discharger 5, which is a negative charger. The image is projected onto a drum-shaped photoreceptor 6, which is a latent image carrier, thereby forming an electrostatic latent image on the photoreceptor 6. This electrostatic latent image is converted into a toner image by toner from a developing device 7 provided on the right side of the photoconductor 6. This toner image is conveyed from a paper feed section (not shown) and is timed by a registration roller 8. The image is transferred onto a transfer paper that is picked up and conveyed to the surface of the photoreceptor 6 by a transfer charger 9 . The transfer paper on which the toner image has been transferred is transferred to a separation charger 10.
The paper is separated from the photoreceptor 6, passes through the fixing device 11, and is discharged outside the machine as copy paper.
一方、転写後の感光体６は、感光体６の左側方に設けら
れたクリーニング装置１２によって残留トナーが除去さ
れてから除電ランプ１３で残留電荷が除電されて、コロ
ナ放電器５による次の帯電に備えられる。On the other hand, after the photoconductor 6 has been transferred, the residual toner is removed by a cleaning device 12 provided on the left side of the photoconductor 6, the residual charge is eliminated by a discharge lamp 13, and the next charging is performed by a corona discharger 5. be prepared for.
上記のコロナ放電器５は帯電用高圧電源５ａに、レジス
トローラー８はクラッチ８ａに接続されており、これら
の帯電用高圧電源５ａ、クラッチ８ａはマイクロコンピ
ュータ１４のインターフェース（Ｉｌｏ）１４ａに接続
されている。The above-mentioned corona discharger 5 is connected to a charging high-voltage power source 5a, and the registration roller 8 is connected to a clutch 8a.These high-voltage charging power source 5a and clutch 8a are connected to an interface (Ilo) 14a of the microcomputer 14. There is.
上記の現像装置７は、内部に現像電極ローラー７ａ及び
余剰現像液除去ローラ７ｂを備えており、複写機下部に
配置された現像タンク１５から現像液が現像電極ローラ
ー７ａに供給されて現像に供されると共に、余剰の現像
液は現像装置７下部から現像液タンク１５に回収される
。現像タンク１５には、現像液を現像装置７へ汲み上げ
ると共に現像タンク７内で現像液の撹拌流を生じさせる
ポンプ１５ａ、現像タンク内の液温を検出する液温セン
サー１５ｂ、図示しない、補給現像剤ボトルと補給用ト
ナーボトルが設けられている。液温センサー１５ｂは、
図示しないＡ／Ｄ変換器を介して上記ｌ１０１４ａに接
続されている。The above-mentioned developing device 7 is equipped with a developing electrode roller 7a and a surplus developer removing roller 7b inside, and the developing solution is supplied from the developing tank 15 arranged at the bottom of the copying machine to the developing electrode roller 7a for development. At the same time, surplus developer is collected from the lower part of the developing device 7 into the developer tank 15. The developing tank 15 includes a pump 15a that pumps up the developer to the developing device 7 and generates an agitation flow of the developer in the developing tank 7, a liquid temperature sensor 15b that detects the temperature of the liquid in the developing tank, and a replenishing developer (not shown). A toner bottle and a replenishment toner bottle are provided. The liquid temperature sensor 15b is
It is connected to the above l1014a via an A/D converter (not shown).
マイクロコンピュータ−１４は主にマイクロプロセッサ
（ＣＰＵ）１４ｂと、読み出し書き込みメモリ（ＲＡＭ
）１４ｃと、読みだし専用メモリ（ＲＯＭ）１４ｄと上
記ｌ１０１４ａとから構成されている。ＲＡＭ１４ｃに
は、累積のコピー枚数を記憶するコピー枚数カウンター
（レジスタ）、も設けられ、これは、後述するカウント
制御による累積のコピー枚数を記憶するものである。Ｒ
ＯＭ１４ｄには、後述するコロナ放電器５の出力制御の
プログラム等が記憶されている。The microcomputer 14 mainly includes a microprocessor (CPU) 14b and a read/write memory (RAM).
) 14c, a read-only memory (ROM) 14d, and the above l1014a. The RAM 14c is also provided with a copy number counter (register) that stores the cumulative number of copies, and this register stores the cumulative number of copies by counting control, which will be described later. R
The OM 14d stores a program for controlling the output of the corona discharger 5, which will be described later.
この複写機において、従来の不具合を確認するため、コ
ロナ放電器５の出力を感光体６の表面電位が１３５０ボ
ルトになるようにして、種々の液温下において、標準の
トナー付着量が５５０ｍｇ／Ａ４になるような標準原稿
を、新しい現像液、１０万枚の複写に使用した現像液そ
れぞれを用いて複写し、コピーのトナー付着量（ｍｇ／
Ａ４）を測定して、液温、現像液使用量に対応したトナ
ー付着量の変化を贋べたところ、横軸に液温、縦軸にト
ナー付着量を取った第３図の結果を得た。In this copying machine, in order to confirm the conventional malfunction, the output of the corona discharger 5 was set so that the surface potential of the photoreceptor 6 was 1350 volts, and the standard toner adhesion amount was 550 mg/min under various liquid temperatures. Copy a standard A4 document using a new developer and a developer used for 100,000 copies, and calculate the toner adhesion amount (mg/
A4) was measured and the changes in toner adhesion amount corresponding to the liquid temperature and the amount of developer used were observed, and the results shown in Figure 3, where the horizontal axis is the liquid temperature and the vertical axis is the toner adhesion amount, were obtained. .
液温２５℃では、新しい現像液（同図中、「コピー枚数
○枚」と表示）はトナー付着量が目標値５５０ｍｇ／Ａ
４になり、１０万枚の複写に用いた現像液（同図中、
「コピー枚数１０万枚」と表示）では現像液の劣化によ
りトナー付着量が減少するが４５０ｍｇ／Ａ４にはなる
。ところが、（ａ）新しい現像液でも、液温１０℃では
粘性が増加して、トナー付着量が６５０ｍｇ／Ａ４と多
くなりすぎて、シャープネスや解像力が低下してしまう
。At a liquid temperature of 25°C, the new developer (indicated as "number of copies" in the figure) has a target value of toner adhesion of 550 mg/A.
4, and the developer used for making 100,000 copies (in the same figure,
When the number of copies is 100,000), the amount of toner adhesion decreases due to deterioration of the developer, but it becomes 450 mg/A4. However, even with (a) a new developer, the viscosity increases at a solution temperature of 10° C., resulting in an excessively large toner adhesion amount of 650 mg/A4, resulting in a decrease in sharpness and resolution.
又、（ｂ）液温４０℃で、１０万枚の複写に使用した現
像液では、トナー付着量３５０ｍｇ／Ａ４となり、画像
濃度、ベタ均一性が非常に劣ったものになる。Further, (b) in a developer used for copying 100,000 sheets at a liquid temperature of 40° C., the toner adhesion amount was 350 mg/A4, resulting in very poor image density and solid uniformity.
比較のため、−様帯電電位を１２５０ボルト、１４５０
ボルトにして同様の測定をしたところ、第４図、第５図
の結果を得た。第４図に示す１２５０ボルトにおいては
、（ａ′）新しい現像液で、液温１０℃でも、トナー付
着量が目標の５５０ｍｇ／Ａ４となり、第５図に示す１
４５ｏボルトにおいては、（ｂ′）液温４０℃で、１０
万枚の複写に使用した現像液でもトナー付着量は４５０
ｍｇ／Ａ４となり、画像濃度、ベタ均一性も満足いくも
のであった。これらは、−様帯電電位とトナー付着量と
に比例関係か有ることによる。For comparison, −-like charging potentials were set at 1250 volts and 1450 volts.
When similar measurements were made using bolts, the results shown in Figures 4 and 5 were obtained. At 1250 volts shown in Fig. 4, (a') with a new developer, the toner adhesion amount reached the target of 550 mg/A4 even at a solution temperature of 10°C;
At 45 o volts, (b') at a liquid temperature of 40°C, 10
Even with the developer used for making 10,000 copies, the toner adhesion amount is 450.
mg/A4, and the image density and solid uniformity were also satisfactory. These are due to the fact that there is a proportional relationship between the -like charging potential and the amount of toner adhesion.
そこで、本実施例は、トナー付着量が画像濃度、ベタ均
一性等の画像品質の面から許容される範囲内になる帯電
電位を、液温と累積コピー枚数との関係で実験的に求め
ておいて、これらの関係をデータテーブルとしてＲＯＭ
１４ｄに記憶させておき、コロ−す放電器の出力制御に
用いるものである。Therefore, in this example, the charging potential at which the toner adhesion amount falls within an acceptable range in terms of image quality such as image density and solid uniformity was experimentally determined based on the relationship between the liquid temperature and the cumulative number of copies. Then, store these relationships as a data table in ROM.
14d, and is used to control the output of the corroth discharger.
以下、コロナ放電器の出力制御について説明する。The output control of the corona discharger will be explained below.
トナー付着量が、画像濃度、ベタ均一性等の画像品質の
面から許容される範囲内になる帯電電位を、液温と累積
コピー枚数との関係で、実験により求めたところ、下記
衣１の様になった。The charging potential at which the toner adhesion amount falls within an acceptable range in terms of image quality such as image density and solid uniformity was determined through experiments in relation to the liquid temperature and the cumulative number of copies. It became like that.
表に
の表１の様にコロナ放電器の出力を制御すべく、帯電用
高圧電源５ａとして１２５０ボルトから１４５０ボルト
まで可変であるものを用い、第６図の様にマイクロコン
ピュータ１４に接続する。In order to control the output of the corona discharger as shown in Table 1, a high-voltage charging power source 5a that is variable from 1250 volts to 1450 volts is used, and is connected to the microcomputer 14 as shown in FIG.
累積のコピー枚数は、転写紙が給紙されて画像形成動作
が行われる毎に駆動されるレジストローラー８の駆動状
態により、第７図に示すカウント制御を行って求める。The cumulative number of copies is determined by performing counting control as shown in FIG. 7 based on the driving state of the registration rollers 8, which are driven every time the transfer paper is fed and an image forming operation is performed.
同図中の「１回フラグ」はＲＡＭ１４ｃに設けられてい
るレジスタであり、これは、この制御が任意の時間に行
われるので、１回の画像形成動作におけるレジストロー
ラー８の回転中に何回もカウントしてしまわないように
するものであり、コピー枚数カウンターを１加算したと
きに「１回フラグ」をセットし、以降はレジストローラ
ー８が回転していても、コピー枚数カウンターを加算し
ないようにし、レジストローラーの回転が停止したとき
にｒｌ［ｆｆｌフラグ」をリセットすることにより、次
の画像形成動作をカウントできるようにするものである
。The "once flag" in the figure is a register provided in the RAM 14c, and since this control is performed at any time, it is determined how many times the registration roller 8 is rotated during one image forming operation. This is to prevent the number of copies from being counted, and when the number of copies counter is incremented by 1, a "once flag" is set, and from then on, even if the registration roller 8 is rotating, the number of copies counter is not incremented. The next image forming operation can be counted by resetting the rl [ffl flag] when the registration rollers stop rotating.
第８図は、帯電出力制御のフローチャートである。二の
制御はコピー毎に行っても良いし、一定枚数のコピー毎
等に行っても良い。液温は、液温センサー１５ｂの出力
値を工１０１４ｃから読みたして判断するものであシバ
コピー枚数はコピー枚数カウンターの内容を読みだして
判断するものである。各帯電電位はＲＡＭ１４ｃに記憶
され、−様帯電時に帯電用高圧電源５ａに出力される。FIG. 8 is a flowchart of charging output control. The second control may be performed for each copy, or for each copy of a certain number of sheets. The liquid temperature is determined by reading the output value of the liquid temperature sensor 15b from the sensor 1014c, and the number of copies is determined by reading the contents of the copy number counter. Each charging potential is stored in the RAM 14c, and output to the charging high-voltage power supply 5a during negative charging.
この実施例によれば、横軸に液温、縦軸にトナー付着量
を取った第９図に示すように、新しい現像液と１０万枚
の複写に使用した現像液の何れにおいても適正なトナー
付着量を得ることが出来、画像の品質も良好であるとい
う結果が得られた。According to this example, as shown in FIG. 9, where the horizontal axis represents the liquid temperature and the vertical axis represents the amount of toner adhesion, the appropriate level is obtained for both the new developer and the developer used for copying 100,000 sheets. The results showed that it was possible to obtain a good amount of toner adhesion and that the quality of the image was also good.
上記実施例では、現像液の粘性を検出する手段として、
現像タンク１５の液温を検出する液温センサー１５ｂを
用い、間接的に粘性を検出したが、これに替え、液体の
粘度センサーを用いて直接粘度を求めても良い。In the above embodiment, as a means for detecting the viscosity of the developer,
Although the viscosity is indirectly detected using the liquid temperature sensor 15b that detects the temperature of the liquid in the developing tank 15, instead of this, the viscosity may be directly determined using a liquid viscosity sensor.
又、累積コピー枚数をレジストローラー８の状態により
カウントしたが、これに替え、照明装置の移動を検出し
て求めたり、感光体駆動を検出して求めても良い。更に
、この累積コピー枚数を、現像液を全部交換するときに
操作するスイッチ等で０枚にリセットするようにしても
良い。Further, although the cumulative number of copies is counted based on the state of the registration roller 8, instead of this, it may be determined by detecting the movement of the illumination device or by detecting the drive of the photoreceptor. Further, the cumulative number of copies may be reset to 0 using a switch or the like that is operated when all the developer is replaced.
以上のように、この発明によれば、像担持体の一様帯電
器の出力を現像液の粘性及び現像液使用量に応じて制御
するので、液温や現像液の使用量によらず、安定した品
質の画像が得られるという優れた効果がある。As described above, according to the present invention, since the output of the uniform charger of the image carrier is controlled according to the viscosity of the developer and the amount of developer used, This has the excellent effect of providing images with stable quality.
第１図は、本発明の機能ブロック図である。第２図乃至
第９図は、本発明の実施例に係る複写機を説明するため
の図面であり、第２図は複写機全体の概略構成図、第３
図乃至第５図は液温、現像液便用量に対応したトナー付
着量の変化を調べた実験の結果を示すグラフであり、第
３図は感光体電位を１３５０ボルトにしたとき、第４図
は感光体電位を１２５０ボルトにしたとき、第５図は感
光体電位を１４５０ボルトにしたときのものであり、第
６図はマイクロコンピュータ−と主な外部機器との接続
関係を示す回路図、第７図はコピ枚数カウント制御のフ
ローチャート、第８図は帯電出力制御のフローチャート
第９図は本実施例における液温、現像液使用量に対応し
たトナー付着量の変化を調べた実験の結果を示すグラフ
である。
５・・・コロナ放電器、１５ｃ・・液温センサー、５ａ
・・・帯電用高圧電源、１４ マイクロコンピュータ−FIG. 1 is a functional block diagram of the present invention. 2 to 9 are drawings for explaining a copying machine according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of the entire copying machine, and FIG.
Figures 5 to 5 are graphs showing the results of an experiment in which changes in the amount of toner adhesion were investigated in response to the solution temperature and the amount of developer solution. is when the photoreceptor potential is 1250 volts, Figure 5 is when the photoreceptor potential is 1450 volts, and Figure 6 is a circuit diagram showing the connection relationship between the microcomputer and the main external equipment. FIG. 7 is a flowchart for copy count control, and FIG. 8 is a flowchart for charging output control. This is a graph showing. 5...Corona discharger, 15c...Liquid temperature sensor, 5a
... High-voltage power supply for charging, 14 Microcomputer
Claims (2)
粘性を検出する手段と、現像液の使用量を検出する手段
と、像担持体の一様帯電器の出力を現像液の粘性及び現
像液使用量に応じて制御する手段とを設けたことを特徴
とする湿式現像方式の画像形成装置。(1) In a wet development type image forming apparatus, there is a means for detecting the viscosity of the developer, a means for detecting the amount of developer used, and an output of the uniform charger of the image carrier. 1. A wet developing type image forming apparatus characterized by comprising means for controlling according to the amount of liquid used.
内に設けられた現像液の温度センサーを用い、現像液の
使用量を検出する手段として、累積コピー枚数計数手段
を用いることを特徴とする請求項（１）記載の湿式現像
方式の画像形成装置。(2) As a means for detecting the viscosity of the developer, a temperature sensor of the developer provided in the developer tank is used, and as a means for detecting the amount of developer used, a means for counting the cumulative number of copies is used. The wet developing type image forming apparatus according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2123942A JPH0419675A (en) | 1990-05-14 | 1990-05-14 | Image forming device of wet developing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2123942A JPH0419675A (en) | 1990-05-14 | 1990-05-14 | Image forming device of wet developing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0419675A true JPH0419675A (en) | 1992-01-23 |
Family
ID=14873167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2123942A Pending JPH0419675A (en) | 1990-05-14 | 1990-05-14 | Image forming device of wet developing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0419675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5996363A (en) * | 1996-10-28 | 1999-12-07 | Masushita Refrigeration Company | Oil level equalizing system for plural compressors |
-
1990
- 1990-05-14 JP JP2123942A patent/JPH0419675A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5996363A (en) * | 1996-10-28 | 1999-12-07 | Masushita Refrigeration Company | Oil level equalizing system for plural compressors |
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