JPS6018062B2 - Toner control device - Google Patents
Toner control deviceInfo
- Publication number
- JPS6018062B2 JPS6018062B2 JP2615076A JP2615076A JPS6018062B2 JP S6018062 B2 JPS6018062 B2 JP S6018062B2 JP 2615076 A JP2615076 A JP 2615076A JP 2615076 A JP2615076 A JP 2615076A JP S6018062 B2 JPS6018062 B2 JP S6018062B2
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- powder
- detection coil
- toner
- developing
- 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.)
- Expired
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はトナーコントロール装置に係り、特に磁粉をト
ナーを混合した現像粉におけるトナー濃度（混合比）の
検出に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a toner control device, and particularly to detection of toner concentration (mixing ratio) in developer powder in which magnetic powder is mixed with toner.
現像磁気ロールに吸着した滋粉とトナーからなる現像粉
で感光ドラムに形成された潜像を現像する現像装置にお
いて、現像磁気ロール上の現像粉をガイド板によって分
離し、これを検出コイルに作用させ、この検出コイルの
値に基づいて現像粉中のトナー濃度を検出し、以つて必
要に応じてトナ‐を補給して現像粉中のトナー濃度を一
定値に保つトナーコントロール装置が知られている。In a developing device that develops a latent image formed on a photosensitive drum with developer powder made of toner and toner adsorbed on a magnetic developer roll, the developer powder on the magnetic developer roll is separated by a guide plate, and this is applied to a detection coil. A toner control device is known that detects the toner concentration in the developer powder based on the value of this detection coil, and replenishes toner as necessary to maintain the toner concentration in the developer powder at a constant value. There is.
ところで、このような装置の問題点は、前記検出コイル
に現像磁気ロールから漏洩した磁束が作用すると検出誤
差が発生することである。前記漏洩磁束が検出コイルに
作用させないようにするには、検出コイルを現像容器外
に出して漏洩磁束がひ届かないようにするとか、あるい
は検出コイルを磁気シールド材で包囲し磁束を遮断する
方法が考えられる。しかし前者の方法は、形状が大型化
し、また検出コイルまで現像粉を運ぶ手段を付加しなけ
ればならない欠点があり、後者の方法は検ひ出コイルに
流れる電流による磁束が磁気シールド板を流れることに
より検出感度が低下する欠点がある。〔発明の目的〕
本発明の目的は前記した欠点を改善し、小形で２０しか
も検出感度のよいトナー濃度検出が可能なトナーコント
ロール装置を提供することである。By the way, a problem with such an apparatus is that a detection error occurs when magnetic flux leaked from the developing magnetic roll acts on the detection coil. In order to prevent the leakage magnetic flux from acting on the detection coil, the detection coil is placed outside the developer container so that the leakage magnetic flux does not reach the developer container, or the detection coil is surrounded by a magnetic shielding material to block the magnetic flux. is possible. However, the former method has the disadvantage of increasing the size and requiring an additional means to convey the developing powder to the detection coil, while the latter method has the disadvantage that the magnetic flux caused by the current flowing through the detection coil flows through the magnetic shield plate. This has the disadvantage that detection sensitivity decreases. [Object of the Invention] An object of the present invention is to improve the above-mentioned drawbacks and to provide a toner control device which is small in size and capable of detecting toner concentration with high detection sensitivity.
〔発明の概要〕本発明は、ガイド板を磁気シールド材で
形成すると共にその反現像磁気ロール側面を該ガイド板
によって分離した現像粉が流下するように現像容器内に
設け、このガイド板の前記反現像磁気ロール側にサポー
ト板によって該ガイド板面から離して検出コイルを設け
たことを特徴とするもので、ガイド板によって現像磁気
ロールから漏洩して検出コイルに向う磁束を遮断すると
共に検出コイルの感度がガイド板に影響されるのを防止
して所期の目的を達するものである。[Summary of the Invention] The present invention has a guide plate formed of a magnetic shielding material, and the side surface of the anti-development magnetic roll is provided in a developer container so that developer powder separated by the guide plate flows down. A detection coil is provided on the side of the anti-developing magnetic roll, separated from the guide plate surface by a support plate. The desired purpose is achieved by preventing the sensitivity of the sensor from being affected by the guide plate.
第１図は本発明になる現像装置の構成を示す断面図で、
感光ドニム１に形成された潜像は、現像磁気ロール２の
周囲を循環している磁粉とトナ−の混合した現象粉の穂
先により現像される。FIG. 1 is a sectional view showing the configuration of a developing device according to the present invention.
The latent image formed on the photosensitive drum 1 is developed by the tip of a mixed powder of magnetic powder and toner circulating around the developing magnetic roll 2.
かく梓スクリュー３，４により滋粉とトナーはかく拝さ
れて摩擦帯電される。第２図は、第１図のＡ−Ａ′の断
面図で、現像磁気ロール２よりかく梓スクリュー４にか
けて現像粉の１部を現像磁気。The powder and toner are thus stirred by the screws 3 and 4 and triboelectrically charged. FIG. 2 is a cross-sectional view taken along the line A-A' in FIG. 1, in which a portion of the developer powder is transferred from the developing magnetic roll 2 to the Azusa screw 4 to form a developing magnetic field.
ール２の表面から分流させるガイド板５を設けてある。
ガイド板５は磁気シールド効果のある鉄板、パーマロィ
板等で作られており、かく梓スクリュー４の近くに分流
してきた現像粉９が流れ込む吸引穴８が設けられている
。ガイド板５上の反現像磁気ロール側にはボビンに巻か
れた検知コイル７がサポート板６を介して該ガイド板面
から離して取り付けられている。現像磁気ロール２のス
リーブは、Ｐ方向に回転するので、分流された花像粉９
は検知コイル７を通過して吸引穴８よりかく梓スクリュ
ー４側に戻って循環流を形成する。そしてこれらは現像
容器１１内に設けられる。検知コイル７のインダクタン
スは÷ブリッジ回路等の検知回路１４で電圧値へ変換さ
れ、増幅回路１６で増幅され、比較回路１６で設定電圧
値と比較され、設定値をこえるとトナー補充装涜１３を
１回動作させるタイマー回路１７をトリガーする。A guide plate 5 is provided to divert the flow from the surface of the roller 2.
The guide plate 5 is made of a magnetically shielding iron plate, permalloy plate, etc., and is provided with a suction hole 8 near the Azusa screw 4 into which the developer powder 9 that has been diverted flows. A detection coil 7 wound around a bobbin is attached to the anti-development magnetic roll side of the guide plate 5 with a support plate 6 in between and spaced apart from the guide plate surface. Since the sleeve of the developing magnetic roll 2 rotates in the P direction, the separated flower image powder 9
passes through the detection coil 7 and returns to the Azusa screw 4 side through the suction hole 8, forming a circulating flow. These are provided within the developer container 11. The inductance of the detection coil 7 is converted into a voltage value by a detection circuit 14 such as a ÷ bridge circuit, amplified by an amplifier circuit 16, and compared with a set voltage value by a comparison circuit 16. If the set value is exceeded, the toner replenishment system 13 is activated. Trigger the timer circuit 17 to operate once.
これによりトナー室１２から一定量のトナーが現像粉９
へ供孫給され、かく梓スクリュー３，４で磁粉とかく梓
される。ガイド板５による分流量と吸引穴８による還流
量を同一になる様調整しておけば、磁気ロ−ルの回転時
も停止時も検知コイル７の値は、ばらつかないので安定
した測定を行なうことができる。本発明の実施例によれ
ば検知コイル７に作用する現像粉は、ガイド板５のシー
ルド効果により現像磁気ロール２の磁束の影響を受けな
いので滑らかに流れるので検出量のバラッキをおさえる
ことが出釆、かつ検知コイル７も現像磁気ロール２から
磁束を受けないので誤検出がなくなり、更にガイド板５
の影響も受けない効果がある。As a result, a certain amount of toner is transferred from the toner chamber 12 to the developer powder 9.
Magnetic powder is supplied to the magnet powder, and the magnetic powder is mixed with the powder screws 3 and 4. If the divided flow rate by the guide plate 5 and the return volume by the suction hole 8 are adjusted to be the same, the value of the detection coil 7 will not vary even when the magnetic roll is rotating or stopped, so stable measurements can be made. can be done. According to the embodiment of the present invention, the developing powder acting on the detection coil 7 is not affected by the magnetic flux of the developing magnetic roll 2 due to the shielding effect of the guide plate 5, and therefore flows smoothly, making it possible to suppress variations in the detected amount. Since the holder and the detection coil 7 do not receive magnetic flux from the developing magnetic roll 2, false detection is eliminated, and the guide plate 5
It has an effect that is not affected by.
しかも形状が大型化することがない。又磁気ロールの回
転時も停止時も測定できる効果がある。Moreover, the shape does not become large. It also has the effect of being able to measure the magnetic roll both when it is rotating and when it is stopped.
ガイド板、検知コイルの形状は、各種の変形ができるこ
とは、当業者にあきらかである。It is obvious to those skilled in the art that the shapes of the guide plate and the detection coil can be modified in various ways.
以上のように本発明によれば検知コイルでで現像粉のト
ナ−混合比を安定且つ高感度で測定できる。As described above, according to the present invention, the toner mixing ratio of developer powder can be measured stably and with high sensitivity using a detection coil.
第１図は、本発明の構成を示す斜視図、第２図は、第１
図のＡ−〃断面の全体の構成を示す図である。
１・・・・・・感光ドラム、２・・・・・・現像磁気ロ
ール、５・・・・・・ガイド板、６・・・・・・サポ−
ト板、７・・・・・・検知コイル、９・・・・・・現像
粉、１１・・・・・・現像容器。
第１図第２図FIG. 1 is a perspective view showing the configuration of the present invention, and FIG. 2 is a perspective view showing the configuration of the present invention.
It is a figure which shows the whole structure of the A-〃 cross section of a figure. 1...Photosensitive drum, 2...Developing magnetic roll, 5...Guide plate, 6...Support
plate, 7...detection coil, 9...developing powder, 11...developing container. Figure 1 Figure 2
Claims (1)
像粉で感光ドラムに形成された潜像を現像と、その後こ
の現像粉をガイド板によつてこの現像磁気ロールから分
離して検出コイルに作用させ、この検出コイルのインダ
クタンスの値に基づいて現像粉中のトナー濃度を検出す
るトナーコントロール装置において、前記ガイド板を磁
気シールド材で形成すると共にその反現像磁気ロール側
面を該ガイド板によつて分離した現像粉が流下するよう
に現像容器内に設け、このガイド板の前記反現像磁気ロ
ール側にサポート板によつて該ガイド板面から離して前
記検出コイルを設けたことを特徴とするトナーコントロ
ール装置。1 Developing a latent image formed on a photosensitive drum with developer powder consisting of magnetic powder and toner adsorbed on a developing magnetic roll, and then separating this developer powder from the developing magnetic roll by a guide plate and causing it to act on a detection coil. In the toner control device that detects the toner concentration in the developer powder based on the inductance value of this detection coil, the guide plate is formed of a magnetic shielding material, and the side surface of the anti-developing magnetic roll is separated by the guide plate. The toner control is provided in a developer container so that the developed powder flows down, and the detection coil is provided on the side of the guide plate opposite to the developing magnetic roll and separated from the surface of the guide plate by a support plate. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2615076A JPS6018062B2 (en) | 1976-03-12 | 1976-03-12 | Toner control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2615076A JPS6018062B2 (en) | 1976-03-12 | 1976-03-12 | Toner control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52110048A JPS52110048A (en) | 1977-09-14 |
| JPS6018062B2 true JPS6018062B2 (en) | 1985-05-08 |
Family
ID=12185497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2615076A Expired JPS6018062B2 (en) | 1976-03-12 | 1976-03-12 | Toner control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6018062B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7510790B2 (en) | 2002-09-20 | 2009-03-31 | Hitachi Maxell, Ltd. | Magnetic powder, method for producing the same and magnetic recording medium comprising the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57141666A (en) * | 1981-12-10 | 1982-09-02 | Canon Inc | Developing device |
| JPH0635248Y2 (en) * | 1987-07-17 | 1994-09-14 | 三田工業株式会社 | Image forming device developing device |
-
1976
- 1976-03-12 JP JP2615076A patent/JPS6018062B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7510790B2 (en) | 2002-09-20 | 2009-03-31 | Hitachi Maxell, Ltd. | Magnetic powder, method for producing the same and magnetic recording medium comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52110048A (en) | 1977-09-14 |
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