JPS58198067A - Developing device of electrophotographic copying machine - Google Patents
Developing device of electrophotographic copying machineInfo
- Publication number
- JPS58198067A JPS58198067A JP8201582A JP8201582A JPS58198067A JP S58198067 A JPS58198067 A JP S58198067A JP 8201582 A JP8201582 A JP 8201582A JP 8201582 A JP8201582 A JP 8201582A JP S58198067 A JPS58198067 A JP S58198067A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- density
- detecting
- developing device
- gate
- 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
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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電子写真複写機の現像装置の改良に閤するもの
であり、特に、トナー濃度全自動的に調整し得るもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the improvement of a developing device for an electrophotographic copying machine, and in particular, toner density can be fully automatically adjusted.
従来より、キャリアとトナーの混合比全、現像剤（トナ
ーとキャリアの混合物〕の電気抵抗を計測することによ
り測定し、トナー濃度を自動的に調整するものはある。Conventionally, there are devices that automatically adjust the toner concentration by measuring the total mixing ratio of carrier and toner and the electrical resistance of the developer (a mixture of toner and carrier).
例えば、特開昭５７−８５６４号公報や、米国特許第８
．５２７．６５１号明細書に記載さｎたものがそｎであ
る。こｎｂＶｃ記載さｎたものに、いずｒＬもマグネッ
トローラと電極との間の電気抵抗全測定し、トナー磯度
を検知するものである。しかしながら、上記従来例にあ
っては、マグネツ）ｏ−ラと電極との間の抵抗が、１回
でも基準値以下になると直ちにトナーが供給さｎる。従
って、トナーとキャリアの混合比が部分的にバラついて
も、そのバラツキ部分を検知する都度、トナーが供給さ
ｎ１常時トナー過剰状急となる虞ｎがあった。For example, Japanese Patent Application Laid-open No. 57-8564 and U.S. Patent No. 8
．． The one described in the specification of No. 527.651 is that one. In addition to the above-mentioned items, each item rL measures the total electrical resistance between the magnet roller and the electrode to detect the toner hardness. However, in the conventional example described above, toner is supplied immediately when the resistance between the magnetic roller and the electrode becomes less than the reference value even once. Therefore, even if the mixing ratio of toner and carrier varies partially, toner is supplied every time the varying portion is detected, and there is a risk that the toner overload situation will suddenly occur.
本発明は刀為刀λる従来例の難点に鑑みてなさｎ友もの
で、現像剤中のトナー濃度を間欠的に検知し、連続して
少なくとも２包製度不足全検知して、初めてトナーを供
給ｆるものである。そう↑るこｔにより、トナーとキャ
リアの混合、比が部分的にバラついていても、バラツキ
部分全検知する都度、トナーが供給さｎること全防止せ
んとするものである。The present invention has been developed in view of the drawbacks of the conventional methods, and the toner concentration in the developer is detected intermittently, and the toner concentration is detected continuously for at least 2 packages until the toner is detected for the first time. supply. By doing so, even if the mixture and ratio of toner and carrier varies locally, the toner is completely prevented from being supplied every time the variation is detected.
以下本発明の一実施例につき図面に従がい説明する。An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１１１はマグネットローラで、複数の
マグネット（２）・・・が埋設さｎた固定円柱体（３）
と、この固定円柱体（３１０て回転自在に嵌着さｎたア
ルミニウム製のスリーブ１４）とにエリＪ杉成さｎる。In Fig. 1, 111 is a magnet roller, which is a fixed cylindrical body (3) in which a plurality of magnets (2)... are embedded.
And this fixed cylindrical body (aluminum sleeve 14 rotatably fitted at 310) is fitted with an aluminum sleeve.
（５）はマグネットローラ＋１１が回転自在に内装さｎ
た現像室で、このマグネットローラ（１）の他に、トナ
ー（６）とキャリア（図示せず）を混合するための１対
のスクリューコンベア（７）（８）が内装さｎる。なお
、トナー１６１ｉｊ電気的に絶縁性を有し、キャリアは
導電性および磁性を有するものである。まｔ、マグネッ
トローラｉｌ＋の回転軸ｔ９１ ｒｉ、現像１１５１全
形成する筐体（１０）の側壁に回転自在に支持さｎるが
、この回〔図示せず〕により電気的に絶縁さｎる。更に
１、現像室（５）の感光ドラム（１１）に対向する部分
には、開口（５）が形成さｎる。そしてマグネットロー
ラ１１１にて形成さ７′Ｉ５たマグネットブラシの穂先
が、感光ドラム（ｎｌに摺接するようＶＣ構成さｎる。(5) The magnet roller +11 is rotatably installed inside.
In addition to the magnet roller (1), a pair of screw conveyors (7) and (8) for mixing toner (6) and carrier (not shown) are installed inside the developing chamber. Note that the toner 161ij is electrically insulating, and the carrier is electrically conductive and magnetic. The rotating shaft t91ri of the magnet roller il+ is rotatably supported on the side wall of the casing (10) in which the developing image 1151 is entirely formed, and is electrically insulated by this turn (not shown). Furthermore, an opening (5) is formed in a portion of the developing chamber (5) facing the photosensitive drum (11). A VC configuration is constructed such that the tip of the magnetic brush formed by the magnet roller 111 comes into sliding contact with the photosensitive drum (nl).
［１２１け前記現像￥１５）の上１’ｌｌ［、こｎと連
通して設けらｎたトナー貯蔵￥であり、→噌憚岬吻す〒
現像室（５）との連通部にトナー供給手段としてのスポ
ンジ状のトナー供給ローラ０３）が回転自在に設けられ
る。そしてこのトナー供給ローラ０３）が回転すると、
トナー貯蔵室１１２）内のトナ呵６）が現像累１５）内
に少しづつ落下供給さｎる。■はトナー貯蔵！（１２）
の内部に、マグネットローラ（１）の軸線と平行に設け
らｎた回転軸で、この回転軸（１４）には、トナー（６
１ヲかぐげんするかくはん腕Ｑ５が固設さｎる。またこ
のかくけん腕ａυの自由端部近傍には、断面がＬ字状で
回転軸（１４）と平行なかくはん桿（１６）が装着さｎ
る。It is a toner storage unit connected to the upper part of the development unit 121 and the development unit ¥15), and is connected to the toner storage unit.
A sponge-like toner supply roller 03) serving as a toner supply means is rotatably provided in a communication portion with the developing chamber (5). When this toner supply roller 03) rotates,
The toner container 6) in the toner storage chamber 112) is gradually supplied and dropped into the developer layer 15). ■Toner storage! (12)
A rotating shaft (14) is provided inside the magnetic roller (1) parallel to the axis of the magnetic roller (1).
1. A stirring arm Q5 is fixedly installed. Further, near the free end of this stirring arm aυ, a stirring rod (16) having an L-shaped cross section and parallel to the rotating shaft (14) is attached.
Ru.
第２図は本発明実施例のトナー濃度検知回路図であって
、マグネットローラｍ［２００ｖ程度の直流バイアスが
印加さｎる。また、筐体（１ｏ）とコンパレータ０ηの
一方の端子とが抵抗（ＲＩＸＲ２） ’ｆｔ弁して接続
さｎる。（Ｒｖ） ？”１コンパレータａηの他方の端
子に接続さｎた基準電圧膜一定用抵抗である。（０１）
（Ｃ１〕に前記筐体１１ＱＩからの出力電圧の波型全整
形するｔめの平滑コンデンサである。まｔ、□前記コン
パレータ０７１の出力４子ＩＣアンドゲートα〜の一方
の入力端子に接続さｎる。このアンドグー）（１８１の
他方の入力端子に、前記マグネットローラ（口のＩＯ１
転軸１９）に装着さｎたスイッチ０（至）（第」図には
示していない〕に接続さｎる。このスイッチ（＋９）ハ
、マグネットローラＩＩＪが回転している間、即ち複写
機が１コピ一動作全行なっている間に１回だけ信号全出
力するよう構成さｎる。なお、前記スイッチ０９）は１
コピ一動作中に２回以上＠８全出力するものであっても
よい。また、前記アンドゲート（１８）の出力端子は、
トナー濃度を制御するマイクロコンピュータの入力ボー
トに接続さｎる。そして、前記コンパレータＵηげ、筐
体１１ＱＩからの入力端子電圧が、基準電圧よりも高い
とき、即ちトナー濃度が一定値より低いときに、信号を
出力するように動作するものである。FIG. 2 is a toner concentration detection circuit diagram according to an embodiment of the present invention, in which a DC bias of about 200 V is applied to a magnet roller m. Further, the housing (1o) and one terminal of the comparator 0η are connected through a resistor (RIXR2). (Rv)? This is a constant reference voltage film resistor connected to the other terminal of the comparator aη.(01)
(C1) is the tth smoothing capacitor that completely shapes the waveform of the output voltage from the housing 11QI. n. This and goo) (181, the other input terminal of the magnet roller (mouth IO1
This switch (+9) is connected to switch 0 (not shown in the figure) attached to the rotating shaft 19).While the magnet roller IIJ is rotating, that is, the copying machine The switch 09) is configured to output the full signal only once while the switch 09 is performing one copy operation.
It may be possible to output the full @8 output twice or more during one copy operation. Furthermore, the output terminal of the AND gate (18) is
Connected to the input port of a microcomputer that controls toner concentration. The comparator Uη operates to output a signal when the input terminal voltage from the housing 11QI is higher than the reference voltage, that is, when the toner concentration is lower than a certain value.
次に、本発明実施例の動作について、主として７０−チ
ャート図（第６図〕に従かい説明する。Next, the operation of the embodiment of the present invention will be explained mainly with reference to the 70-chart (FIG. 6).
７０−チャート図において／Ｈ）は、マグネットローラ
１１１と筐体（ｌＯ）との間の抵抗値が基準値より低く
、コンパレータＱ７１の入力端子電圧が高い場合、即ち
トナー濃度が基準値よりも低い状態を現わし、’Ｌ’＃
：を逆に抵抗値が高い状態を現わしている。70- In the chart, /H) is when the resistance value between the magnet roller 111 and the housing (lO) is lower than the reference value and the input terminal voltage of the comparator Q71 is high, that is, the toner concentration is lower than the reference value. Indicates the status, 'L'#
: Conversely, it indicates a state where the resistance value is high.
このフローチャート図からもわかるように、トナーセン
サが１回や２回／ ａ ’ ｗ検知しても、トナー（６
）に供給さｎずトナー過剰状態となる虞ｎはない。As you can see from this flowchart, even if the toner sensor detects once or twice/a'w, the toner (6
), there is no risk of excess toner.
トナーセンサが５回連続して’ ａ ＋ （、−検知し
、トナー供給ローラαＪが回転しているにもかかわらず
、トナー（８１が一定濃度に達していない場合、即ちト
ナー貯Ｍ￥（１２１が空になった場合には、トナーラン
プ〔トナー不足を示すランプ〕が点灯する。Even though the toner sensor detects ' a + (, -) five times in a row and the toner supply roller αJ is rotating, the toner (81) has not reached a certain density, that is, the toner storage M When the toner is empty, the toner lamp (lamp indicating toner shortage) lights up.
この動作をフローチャートに沿って説明すると、トナー
センサがａｌ ｆ連続して５回検知し、６回目も′Ｈ
′ である場合には、トナーｆａｌｌがトナー貯蔵シｆ
１２）ＶＣないとの判断をし、トナーランプ？点灯させ
る。従って、トナー濃度にバラツキがあって、トナーセ
ンサが１回や２回／■Ｆ を検知しても、トナーランプ
は点灯しない。なお、トナーランプを点灯させると同時
に「トナーを補給して下さい」という音声を発するよう
にしてもよい。To explain this operation according to the flowchart, the toner sensor detects al f five times in a row, and the sixth time also detects 'H'.
′, then the toner fall is the toner storage system f
12) Is it determined that there is no VC and the toner lamp? Turn it on. Therefore, even if there is variation in toner density and the toner sensor detects /F once or twice, the toner lamp will not light up. Note that a voice saying "Please replenish toner" may be emitted at the same time as the toner lamp is turned on.
ｌＪｂ晶い、Ｆカーおつ７゜７よ、カーヶ補、え後、ト
ナーセンナが６＠連続して／ Ｌｌ 即ち高抵抗を検知
すると、トナーランプが消灯する。トナー濃度のバラツ
キから１回でも′：１．１ ＋検知することにより、直
ちにトナーランプを消灯させると、トナーが充分に補給
さｎていないにも拘らず、トナーの補給が光了し定かよ
うな表示となること全防止するｔめである。When the toner sensor detects 6 consecutive cycles of high resistance, the toner lamp turns off. If the toner lamp is immediately turned off by detecting 1.1 + even once due to the variation in toner concentration, it is possible to confirm that the toner has been refilled even though the toner has not been replenished sufficiently. The aim is to completely prevent such display.
なお、トナー濃度を検知する手段としては、上記実施例
の他に、現嫁剤の比重、透磁率等を測定することにより
、こｎを検知する装置が考えらｎる０In addition to the above-mentioned embodiments, as a means for detecting the toner concentration, a device that detects this by measuring the specific gravity, magnetic permeability, etc. of the developer can be considered.
図面にいずｎも本発明の一笑施例全示し、第１回灯現像
装置の正面断面図、第２図にトナー濃度検知回路図、第
６図は７０−チャート図である。
＋１１・・・マグネットローラ、（６）・・・トナー、
１１０１・・・筐体、１１３１・・・トナー供給ローラ
、ｏ７）・・・コンパレータ、α訃・・アントゲ−）、
ｆ１９）−・・スイッチ。
昧
４３The drawings show all embodiments of the present invention, including a front sectional view of the first lamp developing device, FIG. 2 a toner concentration detection circuit diagram, and FIG. 6 a 70-chart diagram. +11... Magnet roller, (6)... Toner,
1101... Housing, 1131... Toner supply roller, o7)... Comparator,
f19)--Switch. 43
Claims (1)
てコピー動作と同期して、前記現像室内の現像剤中のト
ナー濃度を間欠的に検知する手段と、前記検知手段が連
続して少なくとも２回濃度不足を検知したとき、前記ト
ナー供給手段全動作させる手段とが具備さｎ’ｒｔ電子
写真複写機の現像９首。 ２、トナー濃度を検知する手段が、現像ｇ置を構成する
マグネットローラと、筐体との間の抵抗値全測定する手
段を含む特許請求の範囲第１項記載の電子写真複写機の
現像装置。 ８．１コピ一動作につき濃度検知全１回行ない、濃度不
足を５回連続して検知したときにのみ、トナー供給手段
が動作する特許請求の範囲第１項若しくに第２項記載の
電子写真複写機の現像装置。[Scope of Claims] 1. A means for intermittently detecting the toner concentration in the developer in the developing chamber in synchronization with a copying operation in a two-component developing device including a toner supplying means; and the detecting means. and means for operating all of the toner supply means when insufficient density is detected at least twice in succession. 2. The developing device for an electrophotographic copying machine according to claim 1, wherein the means for detecting the toner concentration includes means for measuring the total resistance between the magnet roller constituting the developing station G and the casing. . 8. The electronic device according to claim 1 or 2, wherein density detection is performed once per copying operation, and the toner supply means operates only when insufficient density is detected five times in a row. A developing device for a photocopy machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8201582A JPS58198067A (en) | 1982-05-14 | 1982-05-14 | Developing device of electrophotographic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8201582A JPS58198067A (en) | 1982-05-14 | 1982-05-14 | Developing device of electrophotographic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58198067A true JPS58198067A (en) | 1983-11-17 |
| JPH0430027B2 JPH0430027B2 (en) | 1992-05-20 |
Family
ID=13762689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8201582A Granted JPS58198067A (en) | 1982-05-14 | 1982-05-14 | Developing device of electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58198067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5140372A (en) * | 1990-01-17 | 1992-08-18 | Minolta Camera Kabushiki Kaisha | Image forming apparatus having a plurality of developing units and detectors for detecting toner density in the developing units |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113249A (en) * | 1974-07-23 | 1976-02-02 | Canon Kk | DENSHISHA SHINGENZOSOCHI |
| JPS57108248U (en) * | 1980-12-23 | 1982-07-03 |
-
1982
- 1982-05-14 JP JP8201582A patent/JPS58198067A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113249A (en) * | 1974-07-23 | 1976-02-02 | Canon Kk | DENSHISHA SHINGENZOSOCHI |
| JPS57108248U (en) * | 1980-12-23 | 1982-07-03 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5140372A (en) * | 1990-01-17 | 1992-08-18 | Minolta Camera Kabushiki Kaisha | Image forming apparatus having a plurality of developing units and detectors for detecting toner density in the developing units |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0430027B2 (en) | 1992-05-20 |
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