JPH028873A - Electrophotographic device - Google Patents
Electrophotographic deviceInfo
- Publication number
- JPH028873A JPH028873A JP63157995A JP15799588A JPH028873A JP H028873 A JPH028873 A JP H028873A JP 63157995 A JP63157995 A JP 63157995A JP 15799588 A JP15799588 A JP 15799588A JP H028873 A JPH028873 A JP H028873A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- replenishment
- timing
- image signal
- control
- 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 5
- 238000000151 deposition Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は電子写真装置に係り、特に二成分現像剤を用い
る現像装置におけるトナー補給制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electrophotographic apparatus, and particularly to a toner replenishment control device in a developing device using a two-component developer.
第４図に電子写真装置として一般的なディジタル複写装
置の構成を示す。FIG. 4 shows the configuration of a general digital copying device as an electrophotographic device.
図においてｌは感光体ドラムであり、この周りに、帯電
チャージャ１１、光学系１２、現像装置１０、転写チャ
ージャ１３、分離チャージャ１４、クリーニングユニッ
ト１５が作像プロセス順に配置しである。１６は手差し
テーブル、１７は給紙カセット、１８は給紙コロ、１９
は搬送ファン、２０はメインモータ、２１は定着ユニッ
ト、２２はスキャナ電源ファン、２３はポリゴンミラー
２４は画像読み取り板（ＣＯＤ） 、２５はレンズ、２
６は蛍光灯である。尚、画像読み取り板２４゜レンズ２
５．蛍光灯２６で原稿走査及び電気画像信号変換手段が
構成され、ポリゴンミラー２３で静電潜像形成手段が構
成される。この複写装置の作動については周知のため省
略する。In the figure, l is a photosensitive drum, around which a charging charger 11, an optical system 12, a developing device 10, a transfer charger 13, a separation charger 14, and a cleaning unit 15 are arranged in the order of image forming process. 16 is a manual feed table, 17 is a paper feed cassette, 18 is a paper feed roller, 19
2 is a transport fan, 20 is a main motor, 21 is a fixing unit, 22 is a scanner power supply fan, 23 is a polygon mirror 24 is an image reading plate (COD), 25 is a lens, 2
6 is a fluorescent light. In addition, the image reading plate 24° lens 2
5. The fluorescent lamp 26 constitutes an original scanning and electric image signal conversion means, and the polygon mirror 23 constitutes an electrostatic latent image forming means. The operation of this copying apparatus is well known and will therefore be omitted.
第５図は現像装置１０の拡大図である。この図に基づき
現像装置１０の概要を説明する。二成分現像方式では、
撹拌ローラ６内のトナーとキャリアは常に一定の比率で
混合されている必要がある。FIG. 5 is an enlarged view of the developing device 10. The outline of the developing device 10 will be explained based on this figure. In the two-component development method,
The toner and carrier in the stirring roller 6 must always be mixed at a constant ratio.
−ｉにトナーの占める重量比は２〜３％程度が最適とさ
れている。撹拌ローラ６内で混合されたトナーとキャリ
アは現像剤と呼び、この現像剤は現像ローラ３により感
光体１に運ばれる。この時怒光体１上の静電潜像の黒（
カラートナーはその色）部分にトナーが付着される。一
方、キャリアは再び撹拌ローラ６に戻って来る。従って
感光体１上へ現像されたトナーの分だけトナーの重量比
は少なくなる。この動作が繰り返されるとトナーの重量
比が最適範囲以下となるため、トナー補給ローラ８を回
転させ−１一定量のトナーを補給する。The optimum weight ratio of toner to -i is about 2 to 3%. The toner and carrier mixed within the stirring roller 6 are called a developer, and this developer is conveyed to the photoreceptor 1 by the developing roller 3. At this time, the black electrostatic latent image on the angry light body 1 (
For color toner, the toner is attached to the area (of that color). Meanwhile, the carrier returns to the stirring roller 6 again. Therefore, the weight ratio of the toner decreases by the amount of toner developed onto the photoreceptor 1. If this operation is repeated, the toner weight ratio falls below the optimum range, so the toner replenishing roller 8 is rotated to replenish a -1 constant amount of toner.
２は現像ローラ３上の現像剤層の厚さを一定にするため
のドクタ、４は搬送スクリュ、５は撹拌セパレータ、７
はアジテータ、９はトナーカートリッジである。2 is a doctor for making the thickness of the developer layer on the developing roller 3 constant; 4 is a conveying screw; 5 is a stirring separator; 7
9 is an agitator, and 9 is a toner cartridge.
ところで従来は、現像剤中のトナー濃度を検知するのに
、フォトセンサを用いていた。By the way, conventionally, a photosensor has been used to detect the toner concentration in the developer.
しかしながらこの方式はセンサが汚れ易く、汚れるとト
ナーとキャリアの混合比が制御出来なくなる欠点がある
。またトナーとキャリアの混じった現像剤をコイル中に
通過させ、コイルのインダクタンス変化により混合比を
検知するＦセンサ方式も知られているが、この方式はセ
ンサ部及びセンサ制御部の構成が複雑になり、高価なも
のになってしまう欠点がある。However, this method has the drawback that the sensor is easily soiled, and if it becomes soiled, the mixing ratio of toner and carrier cannot be controlled. Another known method is the F sensor method, in which a developer containing toner and carrier is passed through a coil and the mixture ratio is detected by changes in coil inductance, but this method requires a complicated configuration of the sensor section and sensor control section. The disadvantage is that it becomes expensive.
本発明は上記従来技術の欠点を解消し、簡単な構成によ
り安定な混合比制御が可能な電子写真装置を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an electrophotographic apparatus that is capable of stable mixing ratio control with a simple configuration.
この目的のため本発明は原稿を走査しこの内容を電気画
像信号に変換する手段と、変換された電気画像信号を感
光体上に静電潜像として形成する手段と、トナーとキャ
リアを撹拌しながら前記潜像上にトナーを付着させる現
像手段を有する電子写真装置において、前記画像信号の
静電潜像形成時期に同期させ、画像信号のトナー消費部
分を計測する計測手段と、計測された値を基にトナー補
給指令を行う指令手段を有することを特徴とする。For this purpose, the present invention provides means for scanning a document and converting the content into an electrical image signal, means for forming the converted electrical image signal as an electrostatic latent image on a photoreceptor, and stirring toner and carrier. In an electrophotographic apparatus having a developing means for depositing toner on the latent image, a measuring means for measuring a toner consumption portion of the image signal in synchronization with the electrostatic latent image forming timing of the image signal, and a measured value. The present invention is characterized in that it has a command means for issuing a toner replenishment command based on.
以下、本発明の一実施例を図面に基づき説明する。Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図は制御ブロック図、第２図はタイミングチャート
、第３図はフローチャートである。FIG. 1 is a control block diagram, FIG. 2 is a timing chart, and FIG. 3 is a flow chart.
本発明ではセンサにより現像剤の濃度を検知する従来例
と異なり、トナーの消費量を検知しトナー補給を制御す
ることを特徴としている。Unlike the conventional example in which the concentration of developer is detected by a sensor, the present invention is characterized in that the amount of toner consumption is detected and toner replenishment is controlled.
今、トナーの初期値をＴ（初期）、トナー補給ローラ１
回転の補給量をＴ（１回転）、画像電気信号１個当たり
のトナー消費量をＴ（１ドツト）、トナー適正濃度の下
限値をＴ（下限）とする。Now, set the initial value of toner to T (initial) and toner supply roller 1.
The amount of rotational replenishment is T (one rotation), the amount of toner consumed per one electrical image signal is T (one dot), and the lower limit of the appropriate toner density is T (lower limit).
実際にトナーが消費されるのは、帯電された感光体ｌ上
に画像電気信号を光エネルギーに変換して照射した時で
ある。従ってトナー消費計測は帯電のタイミングに同期
させる必要があ為。Toner is actually consumed when the electrical image signal is converted into light energy and irradiated onto the charged photoreceptor l. Therefore, it is necessary to synchronize toner consumption measurement with the charging timing.
第２図のタイミングチャートにおいて、（１）に示すよ
うに帯電チャージャ１１がＯＮしている期間が潜像形成
時期であるが、第４図に示すうに帯電チャージャ１１と
光信号の入射点（光学系１２）がずれているため、一定
の時間ずらせた係数力ウンタゲ−１・信号（２）を生成
している。In the timing chart of FIG. 2, the period when the charger 11 is ON is the latent image formation period as shown in (1), but as shown in FIG. Since the system 12) is shifted, a coefficient force untage signal (2) is generated that is shifted by a certain time.
第１図ではトナー消費の計測手段、トナー補給指令手段
としてのＣＰＵ３３によってタイミング発生、トナー消
費量計測、トナー補給の制御を行っている。３Ｉは基準
クロック、画像電気信号。In FIG. 1, timing generation, toner consumption measurement, and toner replenishment control are performed by the CPU 33, which serves as toner consumption measurement means and toner replenishment command means. 3I is a reference clock and an image electric signal.
カウンタゲート信号を入力するゲート、３２はカウンタ
である。A gate 32 is a counter to which a counter gate signal is input.
ところで二成分現像剤のトナー濃度りは、トナーの重１
ｗｔとキャリアの重量Ｗｃより、Ｗ ｔ ＋ Ｗ ｃ
として求まる。By the way, the toner density of a two-component developer is determined by the weight of the toner.
From wt and the weight Wc of the carrier, it is determined as W t + W c .
通常濃度は最適な濃度（以下設定値）に近い値に保たれ
るように制御される。しかし、画像形成時にトナー補給
を行うと画像形成上好ましくないため、画像形成上好外
の時期に補給を行う。このように常に設定値に保つこと
は出来ないため、ある濃度の範囲内で制御する。この時
、濃度がこれ以上低くなると困る値を下限値とする。Normally, the concentration is controlled to be maintained at a value close to the optimal concentration (hereinafter referred to as a set value). However, toner replenishment at the time of image formation is unfavorable for image formation, so toner replenishment is performed at an unfavorable time for image formation. Since it is not possible to always maintain the set value in this way, the concentration is controlled within a certain range. At this time, the lower limit value is the value at which it would be problematic if the concentration were to become lower than this.
以下、第３図のフローチャートに従って説明する。まず
第１に、最初のトナー濃度（初！ＩＪＩ ９Ｍ度）を設
定する（Ｓｌ；ステップ１以下同じ）。初期濃度は（１
）式のＷＬ、Ｗｃによって決まるが、最初は初期剤と呼
ばれる、予め決められた（工場出荷時）濃度に混合され
た現像剤が使用される。従って、初期剤投入時（機械設
置時、及び剤交換時）に初期設定を行えば良い。これ以
外の時は、キャリアの重ｌＷｃは変化しないため、トナ
ーの重量Ｗ【によりトナーの濃度りが決定される。The process will be explained below according to the flowchart shown in FIG. First of all, the initial toner density (initial! IJI 9M degrees) is set (Sl; same as step 1 and below). The initial concentration is (1
Although determined by WL and Wc in the equation ), initially a developer called an initial agent mixed to a predetermined concentration (at the time of shipment from the factory) is used. Therefore, the initial settings may be performed when adding the initializing agent (when installing the machine and when replacing the agent). At other times, the weight lWc of the carrier does not change, so the density of the toner is determined by the weight W of the toner.
次に転写紙１枚で消費されたトナーの量が前述のＴ（消
費）として測定される（Ｓ２）。従って転写紙１枚を現
像した後のトナー重量は、Ｗｔ＝Ｗｔ−Ｔ（消費）
となり、この時の濃度りは（１）式より計算される（Ｓ
３）。この計算値を前述の下限値と比較し、これより大
きい（濃い）時は何もせず、次回の画像形成に備え、下
限値より小さい（薄い）時は、次のステップへ移行する
（Ｓ４）。Next, the amount of toner consumed on one sheet of transfer paper is measured as the aforementioned T (consumption) (S2). Therefore, the toner weight after developing one sheet of transfer paper is Wt = Wt - T (consumption), and the density at this time is calculated from equation (1) (S
3). This calculated value is compared with the lower limit value mentioned above, and if it is larger than this (darker), nothing is done and preparation is made for the next image formation, and if it is smaller than the lower limit (lighter), it moves to the next step (S4). .
次のステップではトナー補給を行う。トナー補給はトナ
ー補給ローラ８を回転することによって行：Ｆ′）れる
が、この時ローラ１回転で補給されるトナーは前述のＴ
（１回転）であり、はぼ一定量である。従ってローラ１
回転後のトナー量は、Ｗｔ＝ｗｔ＋Ｔ（１回転）
となり、（１１式より補給後の濃度が計算される（Ｓ５
）。The next step is toner replenishment. Toner replenishment is performed by rotating the toner replenishment roller 8 (F'), but at this time, the toner replenished with one rotation of the roller is
(one rotation), which is an approximately constant amount. Therefore roller 1
The amount of toner after rotation is Wt=wt+T (1 rotation), and the density after replenishment is calculated from equation 11 (S5
).
この計算値が設定値より太きく（？ｆｆｉ＜）なるまで
、このステップを繰り返し、大きくなった時点でトナー
補給を終了し、次の画像形成に備える（Ｓ６）。This step is repeated until this calculated value becomes thicker than the set value (?ffi<), at which point toner replenishment is finished and preparations are made for the next image formation (S6).
以上の制御は、転写紙１枚の現像が終了した時点で行わ
れ、例えばＣＰＵ３３は、これ以外の期間は他の仕事を
行っている。The above control is performed when the development of one sheet of transfer paper is completed, and for example, the CPU 33 is performing other work during the period other than this.
またＳ２，３４，３５．３６において、予め決定されて
いる変数、定数、例えば初期剤のＷｔ。Further, in S2, 34, 35, and 36, predetermined variables and constants, such as Wt of the initial agent.
Ｗｃ、トナー補給ＩＴ（１回転）等は、ＲＯＭ上に格納
しておく。Wc, toner supply IT (1 rotation), etc. are stored in the ROM.
また、トナー量と濃度をＣＰＵ３３内部の計算で求める
代わりに、トナー量と濃度との関係をＲＯＭ上に格納し
ておくことにより、計算速度を向上させるためにも使用
出来る。Further, instead of calculating the toner amount and density by calculation inside the CPU 33, storing the relationship between the toner amount and density in the ROM can be used to improve calculation speed.
以上はＣＰＵ３３を使用した一実施例であるが、ＣＰＵ
３３のソフトで処理する以外に、ハードウェアによる装
置も可能であり、作業内容はフローチャートに示すもの
と同一である。またフローチャートは細かな変更で同一
の効果が得られる。The above is an example using the CPU33, but the CPU
In addition to the processing using the 33 software, a hardware device is also possible, and the work contents are the same as those shown in the flowchart. Also, the same effect can be obtained by making small changes to the flowchart.
以上、本発明によれば、トナー濃度検知にセンサを必要
としないため低コスト化が図れ、またトナーを消費する
毎に計測を行うため、安定した制御が行える。As described above, according to the present invention, a sensor is not required to detect the toner concentration, so the cost can be reduced, and since measurement is performed every time toner is consumed, stable control can be performed.
第１図は本発明に係る電子写真装置のトナー補給制御ブ
ロック図、第２図は同、タイミングチャート、第３図は
同、フローチャート、第４図はディジタル複写装置の概
略構成を示す側面図、第５図はその要部である現像部の
側面図である。
１０・・・現像装置、２４・・・画像読み取り板、２３
・・・ポリゴンミラー、２５・・・レンズ、２６・・・
蛍光灯、３３・・・ｃｐｕ。
ｔ２ノ
Ｎ
ＦＦ
第 ｌ 図
第２図
第３
図1 is a toner replenishment control block diagram of an electrophotographic apparatus according to the present invention, FIG. 2 is a timing chart thereof, FIG. 3 is a flowchart thereof, and FIG. 4 is a side view showing a schematic configuration of a digital copying apparatus. FIG. 5 is a side view of the main part of the developing section. 10... Developing device, 24... Image reading plate, 23
...Polygon mirror, 25...Lens, 26...
Fluorescent light, 33...cpu. t2 no N FF Fig. 2 Fig. 3
Claims (1)
、変換された電気画像信号を感光体上に静電潜像として
形成する手段と、トナーとキャリアを撹拌しながら前記
潜像上にトナーを付着させる現像手段を有する電子写真
装置において、前記画像信号の静電潜像形成時期に同期
させ、画像信号のトナー消費部分を計測する計測手段と
、計測された値を基にトナー補給指令を行う指令手段を
有することを特徴とする電子写真装置。means for scanning a document and converting the content into an electric image signal; means for forming the converted electric image signal as an electrostatic latent image on a photoreceptor; In an electrophotographic apparatus having a developing means for depositing a toner, the electrophotographic apparatus includes a measuring means for measuring a toner consumption portion of the image signal in synchronization with the electrostatic latent image forming timing of the image signal, and a toner replenishment command based on the measured value. An electrophotographic apparatus characterized in that it has a command means to perform a command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63157995A JP2916774B2 (en) | 1988-06-28 | 1988-06-28 | Electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63157995A JP2916774B2 (en) | 1988-06-28 | 1988-06-28 | Electrophotographic equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9308502A Division JPH10221941A (en) | 1997-11-11 | 1997-11-11 | Electrophotographic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH028873A true JPH028873A (en) | 1990-01-12 |
| JP2916774B2 JP2916774B2 (en) | 1999-07-05 |
Family
ID=15661941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63157995A Expired - Lifetime JP2916774B2 (en) | 1988-06-28 | 1988-06-28 | Electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2916774B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0782052A2 (en) | 1995-12-28 | 1997-07-02 | Fuji Xerox Co., Ltd. | Image forming apparatus and method enabling toner amount control without actual measurement of toner characteristic |
| US8150276B2 (en) | 2007-06-29 | 2012-04-03 | Samsung Electronics Co., Ltd. | Image forming apparatus to adjust driving rate of a supply unit and controlling method of the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60178475A (en) * | 1984-02-24 | 1985-09-12 | Mita Ind Co Ltd | Toner controller |
| JPS623268A (en) * | 1985-06-29 | 1987-01-09 | Canon Inc | Image recording device |
-
1988
- 1988-06-28 JP JP63157995A patent/JP2916774B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60178475A (en) * | 1984-02-24 | 1985-09-12 | Mita Ind Co Ltd | Toner controller |
| JPS623268A (en) * | 1985-06-29 | 1987-01-09 | Canon Inc | Image recording device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0782052A2 (en) | 1995-12-28 | 1997-07-02 | Fuji Xerox Co., Ltd. | Image forming apparatus and method enabling toner amount control without actual measurement of toner characteristic |
| US5812903A (en) * | 1995-12-28 | 1998-09-22 | Fuji Xerox Co., Ltd. | Image forming apparatus and method enabling toner amount control without actual measurement of toner characteristic |
| US8150276B2 (en) | 2007-06-29 | 2012-04-03 | Samsung Electronics Co., Ltd. | Image forming apparatus to adjust driving rate of a supply unit and controlling method of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2916774B2 (en) | 1999-07-05 |
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