JP3506560B2 - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JP3506560B2 JP3506560B2 JP14668696A JP14668696A JP3506560B2 JP 3506560 B2 JP3506560 B2 JP 3506560B2 JP 14668696 A JP14668696 A JP 14668696A JP 14668696 A JP14668696 A JP 14668696A JP 3506560 B2 JP3506560 B2 JP 3506560B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- detection sensor
- cleaning member
- sensor
- developing device
- 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 - Fee Related
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、現像装置に関し、
特に、複写機、ファクシミリ、レーザプリンタ等の画像
形成装置に使用され、現像剤としてトナーを用いる現像
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device,
In particular, the present invention relates to a developing device used in an image forming apparatus such as a copying machine, a facsimile, a laser printer and the like, which uses toner as a developer.
【０００２】[0002]
【従来の技術】上記のような現像装置としては、例え
ば、特開昭６４−４７７８号公報（従来例１）、特開平
７−３０６５８０号公報（従来例２）などに開示された
ものが知られている。そして、従来例１には、清掃部材
の先端部をトナー量の検知センサのセンサ面に接するよ
うに撹拌部材から突き出す構成とすることで、センサ面
へのトナーの付着を防止するようにした構成が開示され
ている。また、従来例２には、現像装置において、トナ
ー検知センサの両側の清掃部材が接触する位置にリブを
設けることで、トナー検知センサとしての圧電センサ表
面における摩耗による劣化を防止するようにした構成が
開示されている。2. Description of the Related Art As the developing device described above, for example, those disclosed in JP-A-64-4778 (conventional example 1) and JP-A-7-306580 (conventional example 2) are known. Has been. In addition, in the conventional example 1, the tip of the cleaning member is configured to protrude from the stirring member so as to come into contact with the sensor surface of the toner amount detection sensor, thereby preventing the toner from adhering to the sensor surface. Is disclosed. Further, in Conventional Example 2, in the developing device, ribs are provided at positions where the cleaning members on both sides of the toner detection sensor come into contact with each other, so that deterioration of the surface of the piezoelectric sensor as the toner detection sensor due to wear is prevented. Is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来例１の
現像装置では、トナー検知センサのセンサ面に清掃部材
を摺擦させる構成であることから、センサ表面が摩耗し
て劣化し、センサの性能が著しく低下するという問題が
あった。また、清掃部材が偶然にセンサ面上で停止した
場合、清掃部材の当接圧でセンサ表面の振動を止めてし
まうことから誤検知が発生するという問題があった。However, in the developing device of Conventional Example 1, since the cleaning member is made to rub against the sensor surface of the toner detection sensor, the sensor surface is worn and deteriorated, and the performance of the sensor is deteriorated. However, there was a problem in that Further, if the cleaning member happens to stop on the sensor surface, the contact pressure of the cleaning member stops the vibration of the sensor surface, resulting in erroneous detection.
【０００４】一方、従来例２の現像装置の場合、上記の
リブによって従来例１の場合における上記のような問題
は解消される。しかしながら、トナー室にトナー検知セ
ンサを組み付けた時においてリブとセンサ面の高さ方向
の間隔を微小間隔（０．３ｍｍ以下）に設定する必要が
あることから、各部品に高精度を要求されてコスト高と
なるという問題があった。On the other hand, in the case of the developing device of Conventional Example 2, the above-mentioned problem in the case of Conventional Example 1 is solved by the ribs. However, when the toner detection sensor is assembled in the toner chamber, it is necessary to set the distance between the rib and the sensor surface in the height direction to be a minute distance (0.3 mm or less). Therefore, high precision is required for each component. There was a problem of high cost.
【０００５】本発明は、トナー検知センサのセンサ表面
における摩耗による劣化を防止でき、また清掃部材がセ
ンサ面で停止した場合でも誤検知することがなくて、さ
らに低コストで構成できる現像装置を提供することを目
的とする。The present invention provides a developing device which can prevent deterioration of the toner detection sensor due to wear on the sensor surface, and does not cause erroneous detection even when the cleaning member stops on the sensor surface and can be constructed at a lower cost. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】請求項１の現像装置は、
トナーが溜る室の壁に取りつけられてトナー量を検知す
るトナー検知センサと、前記トナー検知センサのセンサ
面に付着したトナーを拭き払って清掃する清掃部材とを
有する現像装置において、前記清掃部材は、前記センサ
面の外周に位置する前記トナー検知センサのケースにの
み接触し、前記トナー検知センサに対向する側の中央部
が前記センサ面と微小間隔を設定して非接触を保つ凹形
状のものであることを特徴とする。A developing device according to claim 1 is
In a developing device having a toner detection sensor mounted on a wall of a chamber in which toner is stored to detect the amount of toner, and a cleaning member for wiping off and cleaning the toner adhering to the sensor surface of the toner detection sensor, the cleaning member is , A concave shape that contacts only the case of the toner detection sensor located on the outer periphery of the sensor surface, and the central portion on the side facing the toner detection sensor maintains a non-contact with the sensor surface by setting a minute gap. Is characterized in that.
【０００７】請求項２の現像装置は、トナーが溜る室の
壁に取りつけられてトナー量を検知するトナー検知セン
サと、前記トナー検知センサのセンサ面に付着したトナ
ーを拭き払って清掃する清掃部材とを有する現像装置に
おいて、前記清掃部材は、前記センサ面の外周に位置す
る前記トナー検知センサのケースにのみ接触し、前記ト
ナー検知センサに対向する側をトナー検知センサに対し
て傾斜し、前記センサ面と微小間隔を設定して非接触を
保つ形状のものであることを特徴とする。According to another aspect of the present invention, there is provided a developing device including a toner detection sensor which is attached to a wall of a chamber where toner is collected and detects the amount of toner, and a cleaning member which wipes off toner attached to the sensor surface of the toner detection sensor. In the developing device having, the cleaning member contacts only the case of the toner detection sensor located on the outer periphery of the sensor surface, and the side facing the toner detection sensor is inclined with respect to the toner detection sensor, It is characterized in that it has a shape that maintains a non-contact by setting a minute gap with the sensor surface.
【０００８】なお、上記の清掃部材としては、例えば、
弾性材料からなるものが用いられる。As the above-mentioned cleaning member, for example,
An elastic material is used.
【０００９】[0009]
【発明の実施の形態】以下に本発明の実施の形態に係る
現像装置を添付図面を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION A developing device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
【００１０】図１において、トナーが収容されたトナー
収容タンク１は、機枠（図示せず）に回転自在に装着さ
れている。トナー収容タンク１の外周には、タンク駆動
モータ３の駆動ギア４と噛み合っているギア２が設けら
れている。これにより、トナー収容タンク１は、タンク
駆動モータ３の駆動より回転し、これにより、トナー口
５から所定量のトナーが排出される。In FIG. 1, a toner containing tank 1 containing toner is rotatably mounted on a machine frame (not shown). A gear 2 that meshes with a drive gear 4 of a tank drive motor 3 is provided on the outer periphery of the toner storage tank 1. As a result, the toner storage tank 1 is rotated by the driving of the tank drive motor 3, and thereby a predetermined amount of toner is discharged from the toner port 5.
【００１１】トナー収容タンク１のトナー口５の下方に
は、トナー室としてのトナーホッパー６が配置されてい
る。トナーホッパー６の上部には搬送スクリュー７が、
また下部には補給ローラ８が、それぞれ設けられてい
る。搬送スクリュー７と補給ローラ８の間には、搬送ス
クリュー７の下部側に沿うようにしてフェンス９が設け
られている。Below the toner port 5 of the toner storage tank 1, a toner hopper 6 as a toner chamber is arranged. A conveying screw 7 is provided above the toner hopper 6,
Replenishing rollers 8 are provided on the lower part. A fence 9 is provided between the conveying screw 7 and the supply roller 8 so as to extend along the lower side of the conveying screw 7.
【００１２】そして、搬送スクリュー７の回転によって
フェンス９を越えたトナーが補給ローラ８に送られ、こ
のようにして、トナーホッパー６に貯えられているトナ
ーが補給ローラ８の回転により現像室（図示せず）に補
給される。なお、搬送スクリュー７と補給ローラ８と
は、ギア１１〜１３を介してトナーホッパー駆動モータ
１０により回転されている。また、トナーホッパー６の
一端、つまり図１において右端には、トナー収容タンク
１のトナー口５の下方に対応する位置にトナー受入れ口
１４が設けられている。Then, the toner that has passed over the fence 9 is sent to the replenishing roller 8 by the rotation of the conveying screw 7, and the toner stored in the toner hopper 6 is rotated by the revolving roller 8 in the developing chamber (see FIG. (Not shown). The conveying screw 7 and the supply roller 8 are rotated by the toner hopper drive motor 10 via the gears 11 to 13. Further, at one end of the toner hopper 6, that is, at the right end in FIG. 1, a toner receiving port 14 is provided at a position corresponding to below the toner port 5 of the toner containing tank 1.
【００１３】また、図２に示したように、トナーホッパ
ー６内のトナー量を検知するトナー検知センサ１５がト
ナー受入れ口１４の近くの搬送スクリュー７に対向する
側壁６ａに取り付けられている。トナー検知センサ１５
は、例えば図４に示したように、振動板１５ａ、圧電素
子１５ｂ、電極１５ｃ、並びに外周に位置するケース１
５ｄからなる圧電センサから構成されている。振動板１
５ａの表面がセンサ面１６となる。また、振動板１５ａ
の外周は、ケース１５ｄにより保持されている。そし
て、上記のセンサ面１６を清掃する清掃部材１８が、搬
送スクリュー７に取り付けられており、搬送スクリュー
７とともに回転する。Further, as shown in FIG. 2, a toner detection sensor 15 for detecting the amount of toner in the toner hopper 6 is attached to a side wall 6a near the toner receiving port 14 and facing the conveying screw 7. Toner detection sensor 15
Is, for example, as shown in FIG. 4, the diaphragm 15a, the piezoelectric element 15b, the electrode 15c, and the case 1 located on the outer periphery.
It is composed of a piezoelectric sensor composed of 5d. Diaphragm 1
The surface of 5a becomes the sensor surface 16. Also, the diaphragm 15a
The outer periphery of is held by the case 15d. A cleaning member 18 for cleaning the sensor surface 16 is attached to the carrying screw 7 and rotates together with the carrying screw 7.
【００１４】ここで、トナー検知センサ１５はセンサ面
１６の振動によりトナーの有無を検知するものであり、
良好な検知精度を得るためにはセンサ面１６にトナーが
付着するのを防止する必要がある。そして、このような
トナー付着防止のためにセンサ面１６を清掃する清掃部
材１８を付設される。Here, the toner detection sensor 15 detects the presence or absence of toner by the vibration of the sensor surface 16.
To obtain good detection accuracy, it is necessary to prevent toner from adhering to the sensor surface 16. Then, a cleaning member 18 for cleaning the sensor surface 16 is attached to prevent such toner adhesion.
【００１５】清掃部材１８としては、トナー検知センサ
１５に接触したときに可逆的に変形する材質の弾性材
料、例えばポリエチレン、ポリエステル、ナイロン、ビ
ニール、フッ素ポリマー等の比較的精度の出やすい合成
樹脂フィルム、あるいは、りん青銅、ピアノ線、ステン
レス等の細線材などが用いられる。As the cleaning member 18, an elastic material which is reversibly deformed when it comes into contact with the toner detection sensor 15, for example, a synthetic resin film such as polyethylene, polyester, nylon, vinyl, fluoropolymer, etc., which is relatively easy to obtain precision. Alternatively, fine wire material such as phosphor bronze, piano wire, stainless steel, etc. is used.
【００１６】より具体的には、清掃部材１８は、図３に
例示したように、１本の弾性を有する金属のワイヤーか
ら作られる。この清掃部材１８は、その両端に形成され
たコイルバネ部１８ａ、コイルバネ部１８ａをつなげる
梁部１８ｂとから構成される。両端のコイルバネ部１８
ａは、そのコイルの中心線が略平行であり、並列される
ように設けられている。また、梁部１８ｂは、その中央
部が凹形状となっている。More specifically, the cleaning member 18 is made of a single metal wire having elasticity, as illustrated in FIG. The cleaning member 18 includes a coil spring portion 18a formed at both ends thereof and a beam portion 18b connecting the coil spring portions 18a. Coil spring part 18 at both ends
The coils a are provided so that their center lines are substantially parallel to each other and arranged in parallel. Further, the beam portion 18b has a concave shape at its center.
【００１７】以上の構成である現像装置では、トナーホ
ッパー６内に充填されているトナーがなくなった場合、
トナー検知センサ１５がこれを検知する。そして、トナ
ー検知センサ１５からの検知信号により、トナー収容タ
ンク１が回転し、トナーをトナー受入れ口１４からトナ
ーホッパー６に供給する。補給されたトナーは、搬送ス
クリュー７の回転でトナーホッパー６の奥側に搬送され
る。そして、フェンス９を乗り越えるなどして、トナー
ホッパー６にトナーが充満されるとともに、同時に駆動
する補給ローラ８によって現像室に所定量づつ補給され
る。そして、再び、トナーホッパー６のトナーがなくな
った場合には、トナー検知センサ１５の信号により、ト
ナーエンドとしてユーザに通知される。In the developing device having the above structure, when the toner filled in the toner hopper 6 is used up,
The toner detection sensor 15 detects this. Then, in response to a detection signal from the toner detection sensor 15, the toner storage tank 1 rotates and toner is supplied from the toner receiving port 14 to the toner hopper 6. The replenished toner is conveyed to the inner side of the toner hopper 6 by the rotation of the conveying screw 7. Then, the toner hopper 6 is filled with the toner, for example, by passing over the fence 9, and at the same time, a predetermined amount is replenished to the developing chamber by the replenishing roller 8 which is simultaneously driven. Then, when the toner in the toner hopper 6 is exhausted again, the user is notified as the toner end by the signal of the toner detection sensor 15.
【００１８】ここで、清掃部材１８が上記のようにトナ
ー検知センサ１５に対向する側の中央部が凹形状である
ことから、清掃部材１８がその回転によりトナー検知セ
ンサ１５に対向したときでも、清掃部材１８はケース１
５ｄにのみ接触するのでセンサ面１６は常に非接触な状
態を保たれる。そして、例えば清掃部材１８の長さや、
トナー検知センサ１５の突き出し量に多少の過不足があ
ってもセンサ面１６を非接触に保つことが出来ることか
ら、各部品の高い精度は必要でなくなる。Since the central portion of the cleaning member 18 facing the toner detection sensor 15 has a concave shape as described above, even when the cleaning member 18 faces the toner detection sensor 15 due to its rotation, The cleaning member 18 is the case 1
Since only 5d contacts, the sensor surface 16 is always kept in a non-contact state. And, for example, the length of the cleaning member 18,
Even if there is a slight excess or deficiency in the amount of protrusion of the toner detection sensor 15, the sensor surface 16 can be kept in non-contact, so that high precision of each component is not necessary.
【００１９】図５に他の実施の形態の要部を示した。こ
の実施の形態においては、上記の実施の形態において清
掃部材１８の中央部を凹形状とすることに代えて、清掃
部材１８として、トナー検知センサ１５に対向する側の
形状をトナー検知センサ１５に対して傾斜した構成とし
た。このように清掃部材１８のトナー検知センサ１５に
対向する部分をトナー検知センサ１５に対して傾斜させ
ることで、清掃部材１８がその回転によりトナー検知セ
ンサ１５に対向する場合でも清掃部材１８がケース１５
ｄにのみ接触する。この結果、センサ面１６は常に非接
触な状態を保つことができる。FIG. 5 shows the main part of another embodiment. In this embodiment, instead of the central portion of the cleaning member 18 having a concave shape in the above-described embodiment, the shape of the cleaning member 18 on the side facing the toner detection sensor 15 is used as the toner detection sensor 15. In contrast, the structure is inclined. By thus inclining the portion of the cleaning member 18 that faces the toner detection sensor 15 with respect to the toner detection sensor 15, even if the cleaning member 18 faces the toner detection sensor 15 due to its rotation, the cleaning member 18 will be the case 15.
Contact only d. As a result, the sensor surface 16 can always be kept in a non-contact state.
【００２０】図６にその他の実施の形態の要部を示し
た。この実施の形態においては、上記の各実施の形態の
ように清掃部材１８の中央部を凹形状としたり、清掃部
材１８を傾斜する構成に代えて、センサ面１６をトナー
検知センサ１５の外周、つまりケース１５ｄに対して凹
ませた構成とした。この構成とすることで、清掃部材１
８がその回転によってトナー検知センサ１５に対向した
ときでも、清掃部材１８がケース１５ｄにのみ接触し
て、センサ面１６とは常に非接触な状態を保つことがで
きる。FIG. 6 shows the main part of another embodiment. In this embodiment, the sensor surface 16 is replaced by the outer circumference of the toner detection sensor 15 in place of the configuration in which the central portion of the cleaning member 18 has a concave shape or the cleaning member 18 is inclined as in the above-described embodiments. That is, the case 15d is configured to be recessed. With this configuration, the cleaning member 1
Even when 8 is opposed to the toner detection sensor 15 due to its rotation, the cleaning member 18 can contact only the case 15d and can always be kept in non-contact with the sensor surface 16.
【００２１】[0021]
【発明の効果】請求項１の現像装置においては、清掃部
材の中央部を凹にする構成であるので、センサ面を非接
触で清掃し、トナー検知センサのセンサ表面における摩
耗による劣化を防止する構造を低コストで構成できる。
また、清掃部材が偶然にセンサ面で停止しても清掃部材
でセンサ表面の振動を止めて誤検知することが防止でき
る。In the developing device according to the first aspect of the present invention, since the central portion of the cleaning member is concave, the sensor surface is cleaned in a non-contact manner to prevent deterioration of the sensor surface of the toner detection sensor due to wear. The structure can be constructed at low cost.
Further, even if the cleaning member accidentally stops at the sensor surface, the cleaning member can stop the vibration of the sensor surface and prevent erroneous detection.
【００２２】請求項２の現像装置においては、清掃部材
のトナー検知センサに対向する部分をトナー検知センサ
に対して傾斜させる構成であるので、請求項１の現像装
置と同様な効果を奏することができる。In the developing device of the second aspect, since the portion of the cleaning member facing the toner detecting sensor is inclined with respect to the toner detecting sensor, the same effect as the developing device of the first aspect can be obtained. it can.
【００２３】[0023]
【図１】本発明の実施の形態の現像装置の概要を示した
説明図である。FIG. 1 is an explanatory diagram showing an outline of a developing device according to an embodiment of the present invention.
【図２】図１の現像装置の要部の説明図である。FIG. 2 is an explanatory diagram of a main part of the developing device in FIG.
【図３】図１の現像装置に使用される清掃部材の説明図
である。FIG. 3 is an explanatory view of a cleaning member used in the developing device of FIG.
【図４】実施の形態のトナー検知センサの説明図であ
る。FIG. 4 is an explanatory diagram of a toner detection sensor according to the embodiment.
【図５】他の実施の形態のトナー検知センサの説明図で
ある。FIG. 5 is an explanatory diagram of a toner detection sensor according to another embodiment.
【図６】その他の実施の形態のトナー検知センサの説明
図である。FIG. 6 is an explanatory diagram of a toner detection sensor according to another embodiment.
１ トナー収容タンク ６ トナーホッパー ７ 搬送スクリュー １５ トナー検知センサ １５ａ 振動板 １５ｂ 圧電素子 １５ｃ 電極 １５ｄ ケース １６ センサ面 １８ 清掃部材 1 Toner storage tank 6 toner hopper 7 Conveyor screw 15 Toner detection sensor 15a diaphragm 15b Piezoelectric element 15c electrode 15d case 16 sensor surface 18 Cleaning member
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/08 114 G03G 21/10 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G03G 15/08 114 G03G 21/10
Claims (2)
ナー量を検知するトナー検知センサと、前記トナー検知
センサのセンサ面に付着したトナーを拭き払って清掃す
る清掃部材とを有する現像装置において、 前記清掃部材は、前記センサ面の外周に位置する前記ト
ナー検知センサのケースにのみ接触し、前記トナー検知
センサに対向する側の中央部が前記センサ面と微小間隔
を設定して非接触を保つ凹形状のものであることを特徴
とする現像装置。1. A developing device comprising: a toner detection sensor mounted on a wall of a chamber where toner is stored to detect the amount of toner; and a cleaning member for wiping off and cleaning the toner adhering to the sensor surface of the toner detection sensor. The cleaning member comes into contact only with the case of the toner detection sensor located on the outer periphery of the sensor surface, and the central portion on the side facing the toner detection sensor is slightly spaced from the sensor surface.
A developing device having a concave shape for setting non-contact by setting .
ナー量を検知するトナー検知センサと、前記トナー検知
センサのセンサ面に付着したトナーを拭き払って清掃す
る清掃部材とを有する現像装置において、 前記清掃部材は、前記センサ面の外周に位置する前記ト
ナー検知センサのケースにのみ接触し、前記トナー検知
センサに対向する側をトナー検知センサに対して傾斜
し、前記センサ面と微小間隔を設定して非接触を保つ形
状のものであることを特徴とする現像装置。2. A developing device having a toner detection sensor mounted on a wall of a chamber where toner is collected to detect the amount of toner, and a cleaning member for wiping off and cleaning the toner adhering to the sensor surface of the toner detection sensor. The cleaning member comes into contact only with the case of the toner detection sensor located on the outer periphery of the sensor surface, the side facing the toner detection sensor is inclined with respect to the toner detection sensor, and a small gap is formed between the cleaning member and the sensor surface. A developing device having a shape that is set and kept non-contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14668696A JP3506560B2 (en) | 1996-05-16 | 1996-05-16 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14668696A JP3506560B2 (en) | 1996-05-16 | 1996-05-16 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09311536A JPH09311536A (en) | 1997-12-02 |
| JP3506560B2 true JP3506560B2 (en) | 2004-03-15 |
Family
ID=15413295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14668696A Expired - Fee Related JP3506560B2 (en) | 1996-05-16 | 1996-05-16 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3506560B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512373B2 (en) | 2005-09-15 | 2009-03-31 | Ricoh Company Ltd. | Image forming apparatus and developer supplier capable of supplying developer at increased speed |
-
1996
- 1996-05-16 JP JP14668696A patent/JP3506560B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512373B2 (en) | 2005-09-15 | 2009-03-31 | Ricoh Company Ltd. | Image forming apparatus and developer supplier capable of supplying developer at increased speed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09311536A (en) | 1997-12-02 |
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