JPH0661013B2 - Development device - Google Patents
Development deviceInfo
- Publication number
- JPH0661013B2 JPH0661013B2 JP22743085A JP22743085A JPH0661013B2 JP H0661013 B2 JPH0661013 B2 JP H0661013B2 JP 22743085 A JP22743085 A JP 22743085A JP 22743085 A JP22743085 A JP 22743085A JP H0661013 B2 JPH0661013 B2 JP H0661013B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- regulating member
- layer thickness
- thickness regulating
- toner layer
- 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
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- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】 技術分野 本発明は、トナー層厚規制部材によって層厚を規制され
たトナー担持体上のトナーによって、潜像担持体に形成
された潜像を可視像化する現像装置に関する。Description: TECHNICAL FIELD The present invention relates to a development for visualizing a latent image formed on a latent image carrier by toner on a toner carrier whose layer thickness is regulated by a toner layer thickness regulating member. Regarding the device.
従来技術 電子複写機、プリンタ、ファクシミリ等の作像装置に採
用される上記形式の現像装置は従来より周知である。2. Description of the Related Art A developing device of the above type used in an image forming apparatus such as an electronic copying machine, a printer, a facsimile is well known.
トナー粒子のみ、あるいはこれに補助成分を含有するト
ナー(すなわち一成分系現像剤)を用いる現像方式とし
ては、導電性磁性トナーを使用し、潜像の電荷によって
トナー粒子に電荷を誘導せしめ、これによりトナーを潜
像に付着させる誘導現像法、絶縁性磁性または非磁性ト
ナーの一方または両者を使用し、このトナーを摩擦帯電
させて潜像を可視像化する摩擦帯電方式等が従来より公
知であるが、いずれの方式においてもトナーがトナー層
厚規制部材によって薄層化され、このトナー層がトナー
担持体に担持されつつ現像領域へ運ばれ現像に供せられ
る。As a developing method using only toner particles or a toner containing an auxiliary component (that is, a one-component developer), a conductive magnetic toner is used, and an electric charge is induced in the toner particles by the charge of the latent image. A known method is an induction developing method for adhering toner to a latent image by means of a toner, a triboelectrification method in which one or both of insulating magnetic or non-magnetic toner is used, and the toner is triboelectrified to visualize the latent image. However, in any of the methods, the toner is thinned by the toner layer thickness regulating member, and this toner layer is carried to the developing area while being carried by the toner carrier, and is used for development.
ところが上述の如き現像方式を採用した現像装置を長時
間使用すると、トナー層厚規制部材にトナーが融着しこ
れが固着する結果、トナー担持体上に安定したトナーの
薄層を形成できなくなり、トナーの固着した部分を通過
したトナーの量が不足し、可視像に白すじや地汚れを発
生させる恐れがある。However, when the developing device adopting the developing method as described above is used for a long time, the toner is fused and adhered to the toner layer thickness regulating member, and as a result, a stable thin layer of toner cannot be formed on the toner carrier, and the toner is not formed. There is a risk that the amount of toner that has passed through the adhered portion will be insufficient, and white lines and background stains may occur on the visible image.
このためトナーの固着を防止する構成が従来より各種提
案され、かつ実用化されている。たとえばトナー担持体
に対するトナー層厚規制部材の押圧力を低減する構成、
あるいは規制部材の形状を工夫する構成、またはトナー
層厚規制部材の表面とトナーの融着し難い低表面エネル
ギー物質で被覆する構成等が代表的なものである。For this reason, various configurations for preventing toner adhesion have been proposed and put into practical use. For example, a configuration for reducing the pressing force of the toner layer thickness regulating member against the toner carrier,
Alternatively, a typical configuration is one in which the shape of the regulation member is devised, or a configuration in which the surface of the toner layer thickness regulation member is covered with a low surface energy substance that does not easily melt the toner.
しかしながらトナー層厚規制部材の押圧力を減らした
り、その形状を工夫する方法ではトナーの固着を大幅に
改善することができない。またトナー層厚規制部材表面
を低表面エネルギー物質で被覆する方法は、トナーの融
着を効果的に防止できるが、トナー担持体に接触する部
分の低表面エネルギー物質が経時的に削られるため、ト
ナー担持体に対するトナー層厚規制部材の押圧力が変化
し、これによってトナー担持体上のトナー層の厚みが徐
々に変化してしまい、厚みの安定したトナー層を長期間
維持することが困難であった。However, it is not possible to significantly improve the toner adhesion by reducing the pressing force of the toner layer thickness regulating member or devising its shape. Further, the method of coating the surface of the toner layer thickness regulating member with a low surface energy substance can effectively prevent the fusion of the toner, but since the low surface energy substance in the portion in contact with the toner carrier is abraded with time, The pressing force of the toner layer thickness regulating member on the toner carrier changes, which causes the thickness of the toner layer on the toner carrier to gradually change, making it difficult to maintain a stable toner layer for a long period of time. there were.
目的 本発明の目的は、トナー層厚規制部材へのトナーの固着
を防止できるとともに、トナー担持体に対するトナー層
厚規制部材の押圧力の経時的な変化を従来よりも低減で
きる冒頭に記載した形式の現像装置を提供することであ
る。OBJECT The object of the present invention is to prevent the toner from sticking to the toner layer thickness regulating member and reduce the change over time in the pressing force of the toner layer thickness regulating member against the toner carrier as compared with the conventional type. It is to provide a developing device of.
構成 本発明は上記目的を達成するため、トナー担持体にトナ
ーを介して接触したトナー層厚規制部材部分以外の規制
部材部分、すなわちその非接触部に、低表面エネルギー
物質を被覆した構成を提案する。Configuration To achieve the above object, the present invention proposes a configuration in which a regulating member portion other than the toner layer thickness regulating member portion contacting the toner carrier via the toner, that is, a non-contact portion thereof is coated with a low surface energy substance. To do.
以下、本発明の実施例を図面に従って説明する。Embodiments of the present invention will be described below with reference to the drawings.
第1図は本発明に係る現像装置1を有する電子複写機の
一部を示し、そのタンク2にはトナー(一成分系現像
剤)3が収容されている。このトナー3は磁性トナーで
あっても非磁性トナーであってもよいが、第1図の例で
は磁性トナーであるとする。FIG. 1 shows a part of an electronic copying machine having a developing device 1 according to the present invention, in which a tank 2 contains a toner (one-component developer) 3. The toner 3 may be a magnetic toner or a non-magnetic toner, but is assumed to be a magnetic toner in the example of FIG.
また本例ではトナー担持体が反時計方向に駆動される円
筒状の現像ローラ4として構成され、その内部にうS極
とN極が周方向に交互に着磁されたマグネット5が不動
に配置されている。トナー3はマグネット5の磁力で現
像ローラ4の表面に引かれ、該ローラ4の回転によりロ
ーラ4の表面に担持されながらその回転方向に搬送され
る。その際現像ローラ4にはトナー層厚規制部材6(第
2図も参照)の先端部領域がトナーを介して接触してお
り、トナーがこの規制部材6を通過することによりその
層厚が規制される。トナー層厚規制部材通過後のトナー
は薄いトナー層3aをなして現像ローラ4に担持されな
がら搬送され、時計方向に回転駆動されるドラム状の感
光体7として構成された潜像担持体と現像ローラ4との
対向領域、すなわち現像領域Dへ運ばれる。ここでトナ
ーは感光体7に形成された静電潜像に静電的に移行し、
潜像が可視像化される。感光体に移行せずに現像領域D
を通過したトナーは再びタンク2の側に戻される。Further, in this example, the toner carrier is constituted as a cylindrical developing roller 4 driven in the counterclockwise direction, and a magnet 5 in which the S pole and the N pole are alternately magnetized in the circumferential direction is immovably arranged. Has been done. The toner 3 is attracted to the surface of the developing roller 4 by the magnetic force of the magnet 5, and is carried in the rotation direction while being carried on the surface of the roller 4 by the rotation of the roller 4. At that time, the front end region of the toner layer thickness regulating member 6 (see also FIG. 2) is in contact with the developing roller 4 through the toner, and the toner passes through the regulating member 6 so that the layer thickness is regulated. To be done. After passing through the toner layer thickness regulating member, the toner forms a thin toner layer 3a, is carried while being carried by the developing roller 4, and is rotated and driven in the clockwise direction. It is conveyed to the area facing the roller 4, that is, the developing area D. Here, the toner is electrostatically transferred to the electrostatic latent image formed on the photoconductor 7,
The latent image is visualized. Development area D without transfer to photoconductor
The toner that has passed through is returned to the tank 2 side again.
トナーとして導電性トナー(低抵抗トナー)を用いたと
きは、トナーが感光体7に対向したとき、その潜像の電
荷によりトナーに逆極性の電荷が誘起され、これにより
トナーが潜像に付着し、また絶縁性トナー(高抵抗トナ
ー)を用いたときは、このトナーとトナー層厚規制部材
6ないしは現像ローラ4との摩擦によってトナーが所定
の極性に帯電される。その際トナー層厚規制部材6によ
ってトナーが薄層化されるため、その全体が均一に帯電
される。現像ローラ4を不動に固定し、マグネット5を
時計方向に回転駆動し、あるいは両者を共に回転駆動す
ることによってトナーを搬送してもよいし、非磁性トナ
ーを用いたときはマグネット5を省略できることも周知
の通りである。When a conductive toner (low resistance toner) is used as the toner, when the toner is opposed to the photoconductor 7, the charge of the latent image induces a charge of the opposite polarity to the toner, which causes the toner to adhere to the latent image. When an insulating toner (high resistance toner) is used, the toner is charged to a predetermined polarity by friction between the toner and the toner layer thickness regulating member 6 or the developing roller 4. At this time, since the toner layer thickness regulating member 6 thins the toner layer, the entire layer is uniformly charged. The toner may be conveyed by fixing the developing roller 4 immovably and rotationally driving the magnet 5 in the clockwise direction, or by rotationally driving both of them, and the magnet 5 can be omitted when non-magnetic toner is used. Is also well known.
現像動作は上述の如く行われるが、この動作が長時間行
われると、特別な処理を施していない従来のトナー層厚
規制部材には経時的にトナーが融着して固着し、これに
より可視像の画質が劣化する恐れのあることは先に説明
した通りである。トナー層厚規制部材上にトナーが融着
するのは、現像ローラ、トナー層厚規制部材およびトナ
ーの三者間に生ずる摩擦熱によってトナー層厚規制部材
の温度が上昇することが主な原因と考えられているが、
本発明者がトナーの融着状態について詳細に検討したと
ころ、トナーを介して現像ローラに接触しているトナー
層厚規制部材部分6a(第1図)にはむしろトナーの融
着は起らず、この接触部6a以外の非接触部、より詳し
くは接触部6aの近傍の周囲部にトナーの融着が発生し
ていることが判った。これは、接触部6aの近傍の非接
触部の温度は接触部6aとほとんど同じであるが、非接
触部に存するトナーはその動きが遅いか、または停止し
ているため融着が加速されるのに対し、接触部6aでは
トナーの動きが激しく、むしろトナーが融着し難くい状
態にあるためと考えられる。The developing operation is carried out as described above, but if this operation is carried out for a long time, the toner is fused and fixed with time on the conventional toner layer thickness regulating member which is not subjected to any special treatment. As described above, the image quality of the visual image may be deteriorated. The toner is fused on the toner layer thickness regulating member mainly because the temperature of the toner layer thickness regulating member rises due to frictional heat generated between the developing roller, the toner layer thickness regulating member and the toner. Is considered,
The present inventor has made a detailed study on the toner fusion state. As a result, the toner fusion does not occur in the toner layer thickness regulating member portion 6a (FIG. 1) in contact with the developing roller via the toner. It has been found that toner fusion occurs in the non-contact portion other than the contact portion 6a, more specifically in the peripheral portion near the contact portion 6a. This is because the temperature of the non-contact portion near the contact portion 6a is almost the same as that of the contact portion 6a, but the toner existing in the non-contact portion has slow movement or is stopped, so that the fusion is accelerated. On the other hand, it is considered that the toner is violently moved at the contact portion 6a and the toner is not easily fused.
本発明は上述した新規な認識に基き構成されており、図
示した実施例ではトナーを介して現像ローラ4に接触し
たトナー層厚規制部材の接触部6a以外の非接触部6b
(第2図)に、トナーの融着し難い低表面エネルギー物
質が被覆されている。すなわち、トナーの固着が発生し
やすい非接触部6b、特に接触部6a近傍の非接触部に
トナーの融着を阻止できる物質を被覆し、元々トナーの
固着が生じ難い接触部6aにはこの物質を被覆しない。
このようにすれば非接触部6bへのトナーの融着を防止
できるだけでなく、接触部6aに上記物質が被覆されて
いないため、その削れを防止でき、現像装置を長時間使
用しても現像ローラ4に対する層厚規制部材の押圧力の
変化を防止でき、よって常に安定した厚みのトナー層3
aを維持でき、現像後の可視像にすじを生ぜしめたり、
地汚れが発生する欠点を抑制でき、安定した濃度の可視
像を得ることが可能とある。The present invention is constructed on the basis of the above-mentioned novel recognition, and in the illustrated embodiment, the non-contact portion 6b other than the contact portion 6a of the toner layer thickness regulating member which comes into contact with the developing roller 4 via the toner.
(FIG. 2) is coated with a low surface energy substance which is difficult to fuse toner. That is, the non-contact portion 6b where the toner is likely to adhere, particularly the non-contact portion near the contact portion 6a, is coated with a substance that can prevent the toner from adhering, and the contact portion 6a where the toner does not tend to adhere is originally made of this substance. Not covered.
By doing so, not only the fusion of the toner to the non-contact portion 6b can be prevented, but also the contact portion 6a is not covered with the above substance, so that the scraping can be prevented and the development can be performed even when the developing device is used for a long time. The change in the pressing force of the layer thickness regulating member against the roller 4 can be prevented, so that the toner layer 3 always has a stable thickness.
a can be maintained, streaking may occur in the visible image after development,
It is possible to suppress the defect that the background stain occurs and obtain a visible image with a stable density.
トナー層厚規制部材6の先端を第1図の状態よりも延長
し、先端部が現像ローラ4に接触しないようにし、規制
部材6の腹部がトナーを介して現像ローラ4に接触する
ようにしたときも、この腹部の接触部には低表面エネル
ギー物質を被覆せず、その他の非接触部、特に接触近傍
の部分にこの物質を被覆すればよい。The tip of the toner layer thickness regulating member 6 is extended from the state shown in FIG. 1 so that the tip portion does not come into contact with the developing roller 4, and the abdomen of the regulating member 6 comes into contact with the developing roller 4 via the toner. At this time, the contact portion of the abdomen may not be coated with the low surface energy substance, and the other non-contact portion, particularly the portion near the contact may be coated with the substance.
体表面エネルギー物質としては、シリコーン樹脂、ある
いはフルオロポリマー等を有利に用いることができる。
またシリコーン樹脂としては、たとえば焼付型、常温硬
化型のスレートシリコーン等を適宜使用できるが、常温
硬化型のシリコーン樹脂であっても強制的に200〜3
00℃程度で焼成して使用すると、その硬度を高めるこ
とができ、トナーとの摩擦による摩耗を抑制できる。市
販品としては、信越化学製のKR271、KR255、
KR152や、東レシリコーン製のSR2400、SH
840、SR2406等を有利に用いることができる。As the body surface energy substance, silicone resin, fluoropolymer or the like can be advantageously used.
As the silicone resin, for example, a baking type or a room temperature curing type slate silicone can be used as appropriate, but even a room temperature curing type silicone resin is forced to be 200 to 3
When it is used after being baked at about 00 ° C., its hardness can be increased and abrasion due to friction with the toner can be suppressed. As commercially available products, Shin-Etsu Chemical KR271, KR255,
KR152, Toray Silicone SR2400, SH
840, SR2406, etc. can be used advantageously.
次に、より具体的な実験例を挙げて説明する。Next, a more specific experimental example will be described.
実験例1 トナー層厚規制部材6の基材としてステンレス鋼の板を
用い、規制部材6を第1図のようにセットしたときに現
像ローラ4に接触しない部分、すなわち第2図に示した
非接触部6bにのみ、次に示すシリコーン樹脂を塗布し
た(接触部6aには塗布しない)。Experimental Example 1 A stainless steel plate was used as a base material of the toner layer thickness regulating member 6, and a portion which did not come into contact with the developing roller 4 when the regulating member 6 was set as shown in FIG. 1, that is, a portion shown in FIG. The following silicone resin was applied only to the contact portion 6b (not applied to the contact portion 6a).
シリコーン樹脂 (東レシリコーン製SR2400) 100重量部 トルエン 700重量部 次いでこれを250℃で1時間加熱してシリコーン膜の
焼成を行い、トナー層厚規制部材6を得た。Silicone resin (SR2400 manufactured by Toray Silicone) 100 parts by weight Toluene 700 parts by weight Next, this was heated at 250 ° C. for 1 hour to bake the silicone film to obtain a toner layer thickness regulating member 6.
焼成の終ったトナー層厚規制部材を第1図に示した現像
装置にセットし、この電子複写機により次に示すトナー
粒子のトナーを用いて、先に説明した態様で連続コピー
テストを行った。The baked toner layer thickness regulating member was set in the developing device shown in FIG. 1, and a continuous copy test was conducted by the electronic copying machine using the toner particles shown below in the manner described above. .
スチレン樹脂 100重量部 マグネタイト(0.1μ) 60重量部 ニグロシンベースEX (オリエント化学製) 2重量部 その結果、2万枚コピー後もその画像に白すじや、地汚
れは発生せず、画像濃度の変動もほとんどなく、実験後
トナー層厚規制部材を取り外して観察してみたが、トナ
ーの固着は全く見られず、シリコーン樹脂の非塗布部、
すなわち第2図に示した接触部6aの削れもほとんどな
かった。Styrene resin 100 parts by weight Magnetite (0.1μ) 60 parts by weight Nigrosine base EX (manufactured by Orient Chemical Co., Ltd.) 2 parts by weight As a result, even after copying 20,000 sheets, white lines and background stains do not occur and the image density There was almost no change, and after the experiment, I removed the toner layer thickness control member and observed it, but no toner adhesion was observed, and the non-coated portion of the silicone resin,
That is, the contact portion 6a shown in FIG. 2 was hardly scraped.
実施例2 第3図に示すように非接触部6bのうち、接触部6aの
近傍部分6cだけ下記処理のシリコーン樹脂溶液を塗布
し、これを200℃で1時間焼成してトナー層厚規制部
材6を得た。Example 2 As shown in FIG. 3, of the non-contact portion 6b, only the portion 6c in the vicinity of the contact portion 6a was coated with the silicone resin solution of the following treatment, and this was baked at 200 ° C. for 1 hour to obtain a toner layer thickness regulating member. Got 6.
シリコーン樹脂(信越化学KR271) 100重量部 トルエン 700重量部 炭化ケイ素 5重量部 この規制部材6を第1図に示す電子複写機の現像装置に
セットし、実施例1と同じトナーを用いて2万枚の連続
コピーテストを行った。その結果、2万枚コピー後もそ
の画像に白すじや地汚れが発生せず、画像濃度は初期と
同じであった。実験後トナー層厚規制部材を観察したト
ナーの固着、削れは共に認められれなかった。Silicone resin (Shin-Etsu Chemical KR271) 100 parts by weight Toluene 700 parts by weight Silicon carbide 5 parts by weight This regulating member 6 is set in the developing device of the electronic copying machine shown in FIG. A continuous copy test of one sheet was performed. As a result, even after copying 20,000 sheets, white streaks and background stains did not occur in the image, and the image density was the same as the initial stage. After the experiment, when the toner layer thickness regulating member was observed, neither sticking nor scraping of the toner was observed.
比較実験例1 ステンレス鋼製のトナー層厚規制部材の基材に対し、そ
の全面(接触部と非接触部)に実験例1と同じシリコー
ン樹脂を塗布し250℃で1時間加熱し、シリコーン膜
の焼成を行った。このようにして得たトナー層厚規制部
材を第1図のようにセットして連続コピーテストを行っ
たところ、約1万枚のコピー後から画像濃度が上昇し、
地汚れが発生した。15000枚のコピー後、トナー層
厚規制部材を取り外して観察したところ、トナーの固着
は発生していなかったが、第4図に示すように現像ロー
ラに接触していたトナー層厚規制部材部分6aが削られ
てシリコーン樹脂の塗布層が薄くなっていた。この削れ
により現像ローラに対するトナー層厚規制部材の押圧力
が変化し、画質劣化の原因となったものと考えられる。Comparative Experimental Example 1 The same silicone resin as in Experimental Example 1 was applied to the entire surface (contact portion and non-contact portion) of the base material of the toner layer thickness regulating member made of stainless steel and heated at 250 ° C. for 1 hour to form a silicone film. Was fired. When the toner layer thickness regulating member thus obtained was set as shown in FIG. 1 and a continuous copy test was conducted, the image density increased after about 10,000 copies,
Ground stains have occurred. After copying 15,000 sheets, the toner layer thickness regulating member was detached and observed. As a result, toner adhesion did not occur, but as shown in FIG. 4, the toner layer thickness regulating member portion 6a that was in contact with the developing roller. Was removed and the coating layer of silicone resin was thin. It is considered that due to this scraping, the pressing force of the toner layer thickness regulating member against the developing roller changes, which causes deterioration of image quality.
実験例3 実験例1と同じくトナー層厚規制部材6の基材としてス
テンレス鋼の板を用い、規制部材6を第1図のようにセ
ットしたとき現像ローラに接触しない第2図に示す非接
触部6bに、ポリテトラフルオロエチレンのエナメル
(Dupont社製852-201クリアーテフロンエナメル、固形
分48重量パーセント)を塗布し、次いでこれを350℃
の温度で30分間焼成してトナー層厚規制部材6を得
た。これを第1図に示した電子複写機の現像装置にセッ
トして、実験例1と同じトナーを用いて連続コピーテス
トを実施した。その結果、実験例1と同様に2万枚のコ
ピー後もその画像に白すじ、地汚れは発生せず、画像濃
度の変化もなかった。実験後トナー層厚規制部材6を取
り外して観察したが、この場合もトナーの固着は見られ
ず、非塗布部(接触部6a)の削れもほとんど認められ
なかった。Experimental Example 3 As in Experimental Example 1, a stainless steel plate was used as the base material of the toner layer thickness regulating member 6, and when the regulating member 6 was set as shown in FIG. 1, it did not come into contact with the developing roller. Part 6b was coated with polytetrafluoroethylene enamel (Dupont 852-201 clear Teflon enamel, solid content 48% by weight), then 350 ° C.
The toner layer thickness regulating member 6 was obtained by firing at the temperature of 30 minutes. This was set in the developing device of the electronic copying machine shown in FIG. 1 and a continuous copy test was conducted using the same toner as in Experimental Example 1. As a result, as in the case of Experimental Example 1, even after copying 20,000 sheets, white streaks and background stains did not occur in the image, and the image density did not change. After the experiment, the toner layer thickness regulating member 6 was removed and observed, but in this case as well, no toner sticking was observed, and almost no scraping of the non-coated portion (contact portion 6a) was observed.
実験例4 トナー層厚規制部材の基材に対し、第3図に示した非接
触部6bのうち、現像ローラに接触する接触部6aの近
傍の部分6cだけに、ポリテトラフルオロエチレン混合
液(固形分30パーセント)に対して疎水性シリカ0.
1重量部を混合したコート液を塗布し、400℃で30
分間焼成してトナー層厚規制部材6を得た。これを第1
図のようにセットして実験例1と同じトナーによって2
万枚の連続コピーを行った結果、2万枚コピー後も白す
じ、地汚れは発生せず、画像濃度は初期と同じであっ
た。実験後トナー層厚規制部材を観察したがトナーの固
着、削れはなかった。Experimental Example 4 Of the non-contact portion 6b shown in FIG. 3 with respect to the base material of the toner layer thickness regulating member, only the portion 6c near the contact portion 6a in contact with the developing roller is mixed with the polytetrafluoroethylene mixed liquid ( Hydrophobic silica to solids 30%).
Apply 1 part by weight of coating liquid and apply at 400 ℃ for 30
The toner layer thickness regulating member 6 was obtained by firing for a minute. This is the first
Set as shown and set 2 using the same toner as in Experiment 1.
As a result of continuous copying of 10,000 sheets, white streaks and background stains did not occur even after copying 20,000 sheets, and the image density was the same as that at the initial stage. After the experiment, the toner layer thickness regulating member was observed, but there was no toner sticking or scraping.
比較実験例2 ステンレス鋼の基材に全面に実験例3で用いたものと同
じポリテトラフルオロエチレンのエナメルを塗布し、3
50℃で30分間焼成して得たトナー層厚規制部材を第
1図のようにセットし、実験例1と同じトナーを用いて
連続コピーテストを行った。その結果、約1万枚のコピ
ー後から画像濃度が上昇し、地汚れが発生した。150
00枚のコピー後、トナー層厚規制部材を取り外して観
察したところ、トナーの固着はなかったが、この場合も
第4図に示す如く現像ローラとの接触部6aが削られて
塗布量が薄くなっていた。Comparative Experimental Example 2 The same enamel of polytetrafluoroethylene as that used in Experimental Example 3 was applied to the entire surface of a stainless steel base material, and 3
The toner layer thickness regulating member obtained by firing at 50 ° C. for 30 minutes was set as shown in FIG. 1, and a continuous copy test was conducted using the same toner as in Experimental Example 1. As a result, the image density increased after copying about 10,000 sheets, and scumming occurred. 150
After copying 00 sheets, when the toner layer thickness regulating member was removed and observed, the toner did not stick, but in this case as well, the contact portion 6a with the developing roller was shaved as shown in FIG. Was becoming.
本発明はトナー担持体が現像スリーブではなくベルトか
ら成るときも適用でき、また潜像担持体がドラム状の感
光体ではなくベルト状の感光体、誘導体ドラム、あるい
は誘電体ベルトから成るときも同様であり、電子複写機
以外の各種作像装置における現像装置にも適用できる。The present invention is also applicable when the toner carrier comprises a belt instead of a developing sleeve, and also when the latent image carrier comprises a belt-shaped photoconductor, a dielectric drum, or a dielectric belt instead of a drum-shaped photoconductor. Therefore, the invention can be applied to developing devices in various image forming apparatuses other than electronic copying machines.
またトナー担持体に対するトナー層厚規制部材の非接触
部6b全体に低表面エネルギー物質を被覆しなくとも、
従来トナーが固着しやすかった部分、すなわち接触部6
aの近傍を被覆するだけであってもよいことは第3図の
例からも明らかである。トナー層厚規制部材の基材とし
てはステンレス鋼に限らず、他の金属、または合成樹脂
等を適宜用いることができることも当然である。In addition, even if the low surface energy substance is not coated on the entire non-contact portion 6b of the toner layer thickness regulating member with respect to the toner carrier,
Conventionally, the portion where the toner is easily fixed, that is, the contact portion 6
It is clear from the example of FIG. 3 that only the vicinity of a may be covered. The base material of the toner layer thickness regulating member is not limited to stainless steel, and it is natural that other metal, synthetic resin or the like can be appropriately used.
効果 本発明によれば、トナー層厚規制部材へのトナーの固着
を防止でき、しかもその接触部の削れを抑制できるので
トナー担持体に対するトナー層厚規制部材の接触状態の
変化を低減でき、現像された画像にすじや地汚れが発生
することを抑制し、安定した画像濃度を維持することが
可能となった。Effects According to the present invention, it is possible to prevent the toner from sticking to the toner layer thickness regulating member, and further to prevent the contact portion from being scraped off. It has become possible to suppress the generation of streaks and background stains on the formed image and maintain a stable image density.
第1図は、本発明に係る現像装置を有する電子複写機の
一部を示す断面図、第2図および第3図はトナー層厚規
制部材をそれぞれ示す斜視図、第4図は削れが発生した
トナー層厚規制部材を示す斜視図である。 1…現像装置 3…トナー 6…トナー層厚規制部材FIG. 1 is a sectional view showing a part of an electronic copying machine having a developing device according to the present invention, FIGS. 2 and 3 are perspective views showing a toner layer thickness regulating member, and FIG. FIG. 6 is a perspective view showing the toner layer thickness regulating member. 1 ... Developing device 3 ... Toner 6 ... Toner layer thickness regulating member
Claims (3)
れたトナー担持体上のトナーによって、潜像担持体に形
成された潜像を可視像化する現像装置において、 トナー担持体にトナーを介して接触するトナー層厚規制
部材部分以外の層厚規制部材部分に、低表面エネルギー
物質を被覆したことを特徴とする前記現像装置。1. A developing device for visualizing a latent image formed on a latent image bearing member by toner on a toner bearing member whose layer thickness is regulated by a toner layer thickness regulating member. The developing device, wherein a layer surface thickness regulating member portion other than the toner layer thickness regulating member portion that is in contact with the toner is covered with a low surface energy substance.
脂である特許請求の範囲第1項に記載の現像装置。2. The developing device according to claim 1, wherein the low surface energy substance is a silicone resin.
マーである特許請求の範囲第1項に記載の現像装置。3. The developing device according to claim 1, wherein the low surface energy substance is a fluoropolymer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22743085A JPH0661013B2 (en) | 1985-10-12 | 1985-10-12 | Development device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22743085A JPH0661013B2 (en) | 1985-10-12 | 1985-10-12 | Development device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6286381A JPS6286381A (en) | 1987-04-20 |
JPH0661013B2 true JPH0661013B2 (en) | 1994-08-10 |
Family
ID=16860728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22743085A Expired - Fee Related JPH0661013B2 (en) | 1985-10-12 | 1985-10-12 | Development device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0661013B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0546030Y2 (en) * | 1987-06-05 | 1993-12-01 | ||
US5060021A (en) * | 1989-12-26 | 1991-10-22 | Minolta Camera Kabushiki Kaisha | Monocomponent developing device |
JP4413878B2 (en) | 2006-03-03 | 2010-02-10 | シャープ株式会社 | Developing device and image forming apparatus |
-
1985
- 1985-10-12 JP JP22743085A patent/JPH0661013B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS6286381A (en) | 1987-04-20 |
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