JPH0419763A - Toner concentration controller - Google Patents
Toner concentration controllerInfo
- Publication number
- JPH0419763A JPH0419763A JP12458890A JP12458890A JPH0419763A JP H0419763 A JPH0419763 A JP H0419763A JP 12458890 A JP12458890 A JP 12458890A JP 12458890 A JP12458890 A JP 12458890A JP H0419763 A JPH0419763 A JP H0419763A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic permeability
- toner
- detected
- value
- 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
- 230000035699 permeability Effects 0.000 claims abstract description 37
- 238000010792 warming Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 108091008695 photoreceptors Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005513 bias potential Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ）産業上の利用分野
この発明はトナーとキャリアとからなる現像剤を収納し
、現像剤に透磁率に応してトナー補給かされるトナー濃
度の制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field This invention relates to a toner concentration control device that stores a developer consisting of toner and carrier and replenishes toner to the developer according to magnetic permeability. .
ｆｂｌ従来の技術
電子写真式複写機等の画像形成装置ＳＬおいてはトナー
とキャリアとからからなる二成分現像剤を用いて像形成
を行っている。前記トナーは着色別を含む樹脂からなり
、前記キャリアは鉄粉等からなる。このような二成分現
像剤を用いた画像形成装置では一般に現像剤の透磁率を
測定することによって現像剤中のトナー濃度を判断し、
トナー補給を行っている。fbl Prior Art In an image forming apparatus SL such as an electrophotographic copying machine, an image is formed using a two-component developer consisting of toner and carrier. The toner is made of a colored resin, and the carrier is made of iron powder or the like. In an image forming apparatus using such a two-component developer, the toner concentration in the developer is generally determined by measuring the magnetic permeability of the developer.
Toner is being replenished.
ところで前記基１１！透磁率は現像剤を交換したときに
は再設定しなければならない。トナー濃度が同じでも透
磁率がロフトによって変わってしまうためで、従来この
基準透磁率の設定処理は現像剤交換処理の一貫としてマ
ニュアルで行われていたｆｃ）発明が解決しようとする
課題
しかしながら基準透磁率設定処理をマニュアルが行うの
は作業者の手間になる問題があるとともに、現像剤交換
時に基準透磁率設定処理を忘れてしまうと正確なトナー
濃度制御を行えなくなってしまうことがあった。By the way, the above group 11! The magnetic permeability must be reset when the developer is replaced. This is because even if the toner concentration is the same, the magnetic permeability changes depending on the loft. Conventionally, the standard permeability setting process was performed manually as part of the developer replacement process. Manually performing the magnetic permeability setting process has the problem of requiring a lot of work for the operator, and if the reference magnetic permeability setting process is forgotten when replacing the developer, accurate toner concentration control may not be possible.
この発明の目的は、現像剤の交換時に自動的に基？ｉ！
遇１．ｆｌ率が設定されるようにして操作者の手間を
軽減するとともに、設定忘れを防止するトナー濃度制御
装置を提供することにある。The purpose of this invention is to automatically reset the developer when replacing it? i!
Encounter 1. It is an object of the present invention to provide a toner density control device that allows the fl rate to be set, thereby reducing the labor of an operator and preventing forgetting to set it.
（ｄ）課題を解決するための手段
この発明は、トナーとキャリアとからなる現像剤を収納
し、現像剤の透磁率が基準透磁率以下であるときにトナ
ーが補給される現像槽に備えられるトナー濃度制御装置
であって、
前記現像槽の着脱状態を検出する手段と、現像槽着脱有
が検出された直後のウオームアンプ時に現像剤の電流値
を検出する手段と、この電流値が予め定められた規定値
以上であるときに現像剤の透磁率を検出してその値を前
記基準透磁率として設定する手段と、
を設けたことを特徴とする。(d) Means for Solving the Problems This invention is provided in a developer tank that stores a developer consisting of toner and a carrier and is replenished with toner when the magnetic permeability of the developer is less than or equal to a reference magnetic permeability. The toner concentration control device includes means for detecting the attachment/detachment state of the developer tank, means for detecting a current value of the developer at the time of a warm amplifier immediately after the presence of attachment/detachment of the developer tank is detected, and a means for detecting a current value of the developer at the time of a warm amplifier immediately after the presence or absence of the developer tank is detected. and a means for detecting the magnetic permeability of the developer and setting the value as the reference magnetic permeability when the magnetic permeability of the developer is equal to or higher than a specified value.
（８１作用
この発明においては、現像剤の着脱か検出されたときに
はその直後のウオームアツプ時に現像剤の電流値が検出
される。現像剤においてはキあリアが電流を通すが、キ
ャリア（ま使用に伴い表面に付着する樹脂等によって抵
抗が増し電流が通り難くなり、交換直後の現像剤が一番
電流値か高い。(81 action) In this invention, when it is detected whether the developer is attached or detached, the current value of the developer is detected during warm-up immediately after that.In the developer, the carrier conducts current, but the carrier Along with this, resistance increases due to resin etc. that adhere to the surface, making it difficult for current to pass through, and the current value is highest in the developer immediately after replacement.
このようなことから現像槽の着脱力管テわれ、かつその
後の電流値が規定値以上の場合には現像剤の交換が行わ
れたものと判断しても差し支えがない。このようにして
現像剤の交換が行われたと判断されたときに、現像剤の
透磁率が検出され、その値が基準透磁率として設定され
る。そして以後のトナー濃度制御は新たに設定された基
準透磁率に基づいて行われるようになる。For this reason, it is safe to conclude that the developer has been replaced if the developer tank attachment/detachment tube is damaged and the subsequent current value is equal to or higher than the specified value. When it is determined that the developer has been replaced in this way, the magnetic permeability of the developer is detected, and the value is set as the reference magnetic permeability. Subsequent toner concentration control is then performed based on the newly set reference magnetic permeability.
（ｆ）実施例
第２図はこの発明の実施例である複写機のブロフク図で
ある。(f) Embodiment FIG. 2 is a diagram of a copying machine which is an embodiment of the present invention.
現像槽１にはトナーとトヤリアとからなる現像剤が収納
されている。現像槽１の上方にはトナーボックス２が備
えられ、トナーが収納されているトナーボックス２と現
像槽１との間にはトナー補給ローラ３が備えられ、トナ
ー補給時に回転する。現像槽１の、感光体４対間面には
現像ローラ５か配置されている。現像ローラ５にはバイ
アス回路６が接続され、現像ローラ５にバイアス電位を
印加している。このバイアス電位と感光体４の電位との
電位差によって現像ローラ５から感光体４ヘトナーが静
電気的に供給される。A developer tank 1 stores a developer consisting of toner and Toyaria. A toner box 2 is provided above the developer tank 1, and a toner replenishment roller 3 is provided between the toner box 2 containing toner and the developer tank 1, and rotates during toner replenishment. A developing roller 5 is arranged on the surface of the developing tank 1 between the pair of photoreceptors 4. A bias circuit 6 is connected to the developing roller 5 and applies a bias potential to the developing roller 5. Due to the potential difference between this bias potential and the potential of the photoreceptor 4, toner is electrostatically supplied from the developing roller 5 to the photoreceptor 4.
現像槽１中のトナー濃度はトナー濃度センサ７によって
検出されている。トナー濃度センサ７は現像剤の透磁率
をトナー濃度として検出し、その値をＣＰＵ２１に入力
している。ＣＰＵ２１はＲＯＭ２２に記憶されたプログ
ラムにより、検出された透磁率が基準透磁率以下である
ときにトナー濃度低下と判断し、トナー補給ローラ３を
回転させてトナーボックス２中のトナーを現像槽１へ補
給する。なお前記基準透磁率はＲＡＭ２３のメモエ
リアリアＭ１に記憶されている。このようにして現像槽
１へはトナー補給ローラ３によりトナーが補給され、ト
ナー濃度が常に一定に保たれている現像槽１の下方には
マイクロスイッチ等からなる現像槽検知センサＳ１か配
置されている。現像槽検知センサＳ］は現像槽１の有無
を検出し、その状態をＣＰＵ２１に入力する。ＣＰＵ２
１はセンサＳｌの検出状態がオン→オフ変化したときに
現像槽の着脱処理が行われたものと判断する。The toner concentration in the developer tank 1 is detected by a toner concentration sensor 7. The toner concentration sensor 7 detects the magnetic permeability of the developer as the toner concentration, and inputs the value to the CPU 21. Based on the program stored in the ROM 22, the CPU 21 determines that the toner concentration has decreased when the detected magnetic permeability is below the reference magnetic permeability, and rotates the toner supply roller 3 to transfer the toner in the toner box 2 to the developer tank 1. Replenish. Note that the reference magnetic permeability is stored in the memory area M1 of the RAM 23. In this way, toner is replenished into the developer tank 1 by the toner replenishment roller 3, and a developer tank detection sensor S1 consisting of a micro switch or the like is arranged below the developer tank 1, where the toner concentration is always kept constant. There is. The developer tank detection sensor S] detects the presence or absence of the developer tank 1 and inputs the state to the CPU 21. CPU2
1, it is determined that the developer tank attachment/detachment process has been performed when the detection state of the sensor Sl changes from on to off.
またバイアス回路６には電流検８回路８が設けられてい
る。電流検出回路８は現像剤に流れる電流を検出する回
路であり、ウオームアツプ時に、現像槽１から感光体４
會に向かっての電流を検出する。第３図はこの検出電流
値と現像剤のライフとの関係を示している。図示するよ
うに現像剤に流れる電流は現像剤交換の初期時には大き
い値をボしているが、使用に伴い徐々に小さ（なってゆ
く。このことから検出電流値が規定値８以上のときには
現像剤の交換が行われたばかりであると判断しでいる。Further, the bias circuit 6 is provided with a current detection circuit 8 . The current detection circuit 8 is a circuit that detects the current flowing through the developer, and detects the current flowing through the developer from the developer tank 1 to the photoreceptor 4 during warm-up.
Detect the current towards the meeting. FIG. 3 shows the relationship between this detected current value and the life of the developer. As shown in the figure, the current flowing through the developer is at a large value at the beginning of developer replacement, but gradually decreases (decreases) as the developer is used. Therefore, when the detected current value is equal to or higher than the specified value 8, the current flowing through the developer is not large enough. It has been determined that the agent has just been replaced.
以上のように構成される複写機において現像剤交換時の
基準透磁率設定処理について説明する。The reference magnetic permeability setting process when replacing the developer in the copying machine configured as described above will be explained.
第１図は同処理の手順を示したフローチャートである。FIG. 1 is a flowchart showing the procedure of the same process.
複写機本体の電源スィッチがオンされると前扉の閉状態
のｎ、認等を行い（ｎｌ）続いてウオームアンプを開始
する（ｎ２）。ウオームアツプは現像槽１内の現像剤の
撹拌処理１図示しない定着装置の昇温処理等である。そ
して現像槽ｌの着脱処理が行われたかどうかが判断され
（ｎ３）、着脱が行われていた場合には電流値検出回路
８により現像剤の電流値ＩＤを読み取り、この値が基準
電流値１０を越えていた場合には現像剤の交換が行われ
たものと判断する（ｎ４→ｎ５）。そして現像剤の交換
有りが判断された場合にはトナーエンプティランプを点
灯してキー操作等の受は付けを拒否し、この間にトナー
濃度センサ７によって検出される透磁率を読み取り、読
み取った値を基準透磁率としてメモリエリアＭ１に記憶
する（ｎ６→ｎ７→ｎ８）。なお基準透磁率は、数点の
サンプリングを行ってその平均値を記憶する。この後ウ
オームアツプが完了すればレディランプを点灯して複写
処理か可能なことを示し、キー操作の受は付けをする（
ｎ ９−＋ｎ １０−＋ｎ １１ ）。When the power switch of the copying machine is turned on, the closed state of the front door is checked (nl), and then the warm amplifier is started (n2). Warm-up includes stirring of the developer in the developing tank 1, heating of the fixing device (not shown), and the like. Then, it is determined whether the developer tank l has been attached or detached (n3), and if it has been attached or detached, the current value ID of the developer is read by the current value detection circuit 8, and this value is set to the reference current value 10. If it exceeds , it is determined that the developer has been replaced (n4→n5). If it is determined that the developer needs to be replaced, the toner empty lamp is turned on and key operations are refused. During this time, the magnetic permeability detected by the toner concentration sensor 7 is read and the read value is It is stored in the memory area M1 as the reference magnetic permeability (n6→n7→n8). Note that for the reference magnetic permeability, sampling is performed at several points and the average value thereof is stored. After this, when warm-up is completed, the ready lamp is lit to indicate that copy processing is possible, and key operations are accepted (
n9-+n10-+n11).
なおこの実施例において現像槽の着脱状態検出手段はセ
ンサＳ１、電流値を検出する手段は電流検出回路８およ
びｎ３．ｎ４、基準透磁率を設定する手段はｎ５．ｎ７
．ｎ３にそれぞれ対応する（ｇ）発明の効果
以上のようにこの発明によれば現像剤の交換が行われた
ときにはその直後の複写機の電源オン時のウオームアツ
プ中に自動的に現像剤の透磁率が検出されてその値が基
準透磁率として設定される。このため、基準透磁率をマ
ニュアルで設定する必要がなくなり作業者の操作負担を
軽減することができる。また、設定忘れというミスを防
止でき、正確な濃度制御を確実に行うことができる。In this embodiment, the means for detecting the mounting/detaching state of the developing tank is the sensor S1, and the means for detecting the current value is the current detection circuit 8 and n3. n4, the means for setting the reference magnetic permeability is n5. n7
．． (g) Effects of the invention corresponding to n3, respectively.As described above, according to the present invention, when the developer is replaced, the developer is automatically transparent during the warm-up period when the copier is turned on immediately after the developer is replaced. Magnetic permeability is detected and its value is set as a reference permeability. Therefore, there is no need to manually set the reference magnetic permeability, and the operational burden on the operator can be reduced. Furthermore, mistakes such as forgetting settings can be prevented, and accurate concentration control can be reliably performed.
第１図はこの発明のトナー濃度制御装置に係る基準透磁
率の設定処理手順を示したフローチャート、第２図は現
像槽近傍の構成を示したブロック図、第３図は現像剤の
ライフと電流値との関係を示した図である。
１−現像槽、２−トナーボックス、３−トナー補給ロー
ラ、５−現像ローラ、６−バイアス回路、７−トナー濃
度センサ、８−電流値検出回路。Fig. 1 is a flowchart showing the standard permeability setting process procedure related to the toner concentration control device of the present invention, Fig. 2 is a block diagram showing the configuration near the developer tank, and Fig. 3 is the life and current of the developer. It is a diagram showing the relationship with values. 1-Developer tank, 2-toner box, 3-toner supply roller, 5-developing roller, 6-bias circuit, 7-toner concentration sensor, 8-current value detection circuit.
Claims (1)
像剤の透磁率が基準透磁率以下であるときにトナーが補
給される現像槽に備えられるトナー濃度制御装置であっ
て、前記現像槽の着脱状態を検出する手段と、現像槽着
脱有が検出された直後のウォームアップ時に現像剤の電
流値を検出する手段と、この電流値が予め定められた規
定値以上であるときに現像剤の透磁率を検出してその値
を前記基準透磁率として設定する手段と、を設けたこと
を特徴とするトナー濃度制御装置(1) A toner concentration control device that is provided in a developer tank that stores a developer consisting of toner and carrier and is replenished with toner when the magnetic permeability of the developer is equal to or lower than a reference magnetic permeability, the device comprising: a means for detecting the attachment/detachment state of the developer tank; a means for detecting a current value of the developer during warm-up immediately after the presence/absence of attachment/detachment of the developer tank is detected; and means for detecting the magnetic permeability of and setting the value as the reference magnetic permeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2124588A JP2989218B2 (en) | 1990-05-15 | 1990-05-15 | Toner density control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2124588A JP2989218B2 (en) | 1990-05-15 | 1990-05-15 | Toner density control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0419763A true JPH0419763A (en) | 1992-01-23 |
| JP2989218B2 JP2989218B2 (en) | 1999-12-13 |
Family
ID=14889182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2124588A Expired - Fee Related JP2989218B2 (en) | 1990-05-15 | 1990-05-15 | Toner density control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989218B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61182557U (en) * | 1985-05-01 | 1986-11-14 |
-
1990
- 1990-05-15 JP JP2124588A patent/JP2989218B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61182557U (en) * | 1985-05-01 | 1986-11-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2989218B2 (en) | 1999-12-13 |
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