JP2001175078A - Developing device - Google Patents

Developing device

Info

Publication number
JP2001175078A
JP2001175078A JP35899699A JP35899699A JP2001175078A JP 2001175078 A JP2001175078 A JP 2001175078A JP 35899699 A JP35899699 A JP 35899699A JP 35899699 A JP35899699 A JP 35899699A JP 2001175078 A JP2001175078 A JP 2001175078A
Authority
JP
Japan
Prior art keywords
cleaning
developing device
cleaning member
layer thickness
developer
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.)
Pending
Application number
JP35899699A
Other languages
Japanese (ja)
Inventor
Toshihide Ogoshi
俊秀 大越
Eiichi Kido
栄一 木戸
Shigeyuki Wakata
茂之 若田
Hiroshige Araki
広重 荒木
Yoshinori Otsuka
義則 大塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP35899699A priority Critical patent/JP2001175078A/en
Publication of JP2001175078A publication Critical patent/JP2001175078A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To surely remove foreign matters lying between a developer carrier and a layer thickness control member. SOLUTION: A cleaning member 6 is attached to a developer case 2 so that a cleaning plate 7 for the cleaning member 6 may lie between the developer carrier 3 and the layer thickness control member 4, and then, the cleaning plate 7 is made movable in the longitudinal direction. The surface of the cleaning plate 6 is constituted of a file surface, and then, the file surface is brought into slidable contact with the leading end part of the layer thickness control member 4. By moving the cleaning member 6, the foreign matter firmly sticking to the layer thickness control member 4 is shaved by the file surface, then, the layer thickness control member 4 is cleaned. All the foreign matter lying between the developer carrier 3 and the layer thickness control member 4 is removed by the cleaning member 6.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、複写機、プリン
タ、ファクシミリ装置等の現像剤による静電潜像を利用
した画像形成装置に使用される現像装置に関し、特に現
像剤担持体上の現像剤の層厚を規制する層厚規制部材の
清掃に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used in an image forming apparatus utilizing an electrostatic latent image by a developer, such as a copying machine, a printer, a facsimile machine, etc., and more particularly to a developer on a developer carrier. The present invention relates to cleaning of a layer thickness regulating member for regulating the layer thickness.

【0002】[0002]

【従来の技術】一般的に電子写真方式の画像形成装置に
おける現像装置では、層厚規制部材(ドクター)が、回
転する現像剤担持体(現像ローラ)にその先端部分を接
触あるいは所定の間隔をおいて対向配置されている。そ
して、現像剤担持体上に現像剤が担持されて、層厚規制
部材によって均一な厚さの現像剤層が形成され、現像剤
担持体の回転によって現像剤担持体と像担持体とが接触
あるいは近接する現像位置まで搬送され、像担持体上の
静電潜像を現像する。
2. Description of the Related Art Generally, in a developing device in an electrophotographic image forming apparatus, a layer thickness regulating member (doctor) contacts a rotating developer carrier (developing roller) at its leading end or at a predetermined interval. At the same time. Then, the developer is carried on the developer carrier, and a developer layer having a uniform thickness is formed by the layer thickness regulating member, and the developer carrier and the image carrier come into contact with each other by the rotation of the developer carrier. Alternatively, the electrostatic latent image on the image carrier is transported to a developing position close thereto, and is developed.

【0003】この場合、現像剤担持体と層厚規制部材と
の間に固化したトナーや紙粉等の異物が挟まって停滞す
ることがある。すると、均一な現像剤層が得られなくな
り、像担持体上の静電潜像を正確に現像できなくなる。
そこで、このような不具合を防ぐために、特開平4−2
04463号公報、特開平7−168440号公報、実
開平2−64970号公報、実開平2−64975号公
報、実開平2−69346号公報に、現像剤担持体と層
厚規制部材との間で清掃部材を設けて、これを層厚規制
部材の長手方向に移動させて異物を除去する技術が開示
されている。
In this case, a solidified foreign substance such as toner or paper powder may be stagnated between the developer carrying member and the layer thickness regulating member. Then, a uniform developer layer cannot be obtained, and the electrostatic latent image on the image carrier cannot be accurately developed.
In order to prevent such a problem, Japanese Patent Application Laid-Open No.
No. 04463, JP-A-7-168440, JP-A-2-64970, JP-A-2-64975, and JP-A-2-69346 disclose the relationship between the developer carrying member and the layer thickness regulating member. There is disclosed a technique of providing a cleaning member and moving the cleaning member in a longitudinal direction of the layer thickness regulating member to remove foreign matter.

【0004】[0004]

【発明が解決しようとする課題】従来のように、清掃部
材を長手方向に移動させる清掃方法では、現像剤担持体
と層厚規制部材との間に停滞している異物を取り除くこ
とは可能であるが、両者の間にはこの方法では取り除け
ない異物、例えば層厚規制部材に固着した現像剤等が存
在する。
As in the conventional cleaning method in which the cleaning member is moved in the longitudinal direction, it is possible to remove foreign matters stagnating between the developer carrier and the layer thickness regulating member. However, there is a foreign matter between the two, which cannot be removed by this method, for example, a developer fixed to the layer thickness regulating member.

【0005】また、清掃部材の層厚規制部材に対する接
触圧が小さいと、十分な清掃効果が得られないことがあ
る。特に、層厚規制部材の現像剤担持体に対する接触圧
が小さい場合や、両者の間隙が大きい場合、あるいは清
掃部材の剛性が小さい場合に、清掃部材の層厚規制部材
に対する接触圧が小さくなり、十分な清掃効果が得られ
ず、異物が残ってしまうことが多い。
If the contact pressure of the cleaning member against the layer thickness regulating member is small, a sufficient cleaning effect may not be obtained. In particular, when the contact pressure of the layer thickness regulating member with respect to the developer carrying member is small, or when the gap between them is large, or when the rigidity of the cleaning member is small, the contact pressure of the cleaning member with respect to the layer thickness regulating member becomes small, In many cases, a sufficient cleaning effect cannot be obtained, and foreign matter remains.

【0006】そこで、本発明は、上記に鑑み、層厚規制
部材に対して清掃部材を確実に接触させ、現像剤担持体
と層厚規制部材との間に存在する異物を完全に取り除く
ことができる現像装置の提供を目的とする。
In view of the above, it is an object of the present invention to reliably contact a cleaning member with a layer thickness regulating member and to completely remove foreign matters existing between the developer carrier and the layer thickness regulating member. It is an object of the present invention to provide a developing device capable of performing the above.

【0007】[0007]

【課題を解決するための手段】本発明による課題解決手
段は、現像剤担持体と層厚規制部材との間に挿入されて
層厚規制部材の先端部分を清掃する清掃部材が層厚規制
部材に対して移動自在に設けられ、清掃部材の摺接面に
やすり面が形成されたものである。これによって、清掃
部材のやすり面が層厚規制部材の先端部分に摺接するの
で、固着した異物でも削り取ることができ、現像剤担持
体と層厚規制部材との間に存在する異物を完全に取り除
くことができる。そして、清掃部材は現像剤担持体にも
摺接するので、清掃部材の現像剤担持体と対向する表面
を平滑にしたり、清掃部材に層厚規制部材よりも軟らか
い材料を用いることによって、現像剤担持体や層厚規制
部材に損傷を与えることを防いでいる。
According to the present invention, a cleaning member inserted between a developer carrier and a layer thickness regulating member to clean a tip portion of the layer thickness regulating member is provided. The cleaning member has a filed surface formed on a sliding contact surface of the cleaning member. As a result, the file surface of the cleaning member comes into sliding contact with the tip portion of the layer thickness regulating member, so that the stuck foreign matter can be scraped off, and the foreign matter existing between the developer carrier and the layer thickness regulating member is completely removed. be able to. Since the cleaning member also comes into sliding contact with the developer carrying member, the surface of the cleaning member facing the developer carrying member can be smoothed, or the cleaning member can be made of a material softer than the layer thickness regulating member. This prevents damage to the body and layer thickness regulating members.

【0008】ここで、さらに清掃効果を高めるには、弾
性部材の弾性を利用して清掃部材を層厚規制部材に接触
する方向に付勢すればよく、清掃部材は層厚規制部材に
押し付けられて、異物を除去するために必要な接触圧が
与えられ、確実な接触が得られるので、安定した清掃効
果を発揮できる。あるいは、清掃部材の移動方向側の側
縁に凹凸を形成してもよく、異物を掻き取る能力が付与
され、異物の除去を促進でき、清掃効果を向上できる。
Here, in order to further enhance the cleaning effect, the cleaning member may be urged in the direction in which it contacts the layer thickness regulating member by utilizing the elasticity of the elastic member, and the cleaning member is pressed against the layer thickness regulating member. As a result, a contact pressure necessary for removing foreign matter is given, and reliable contact is obtained, so that a stable cleaning effect can be exhibited. Alternatively, irregularities may be formed on the side edge on the moving direction side of the cleaning member, and the ability to scrape foreign substances is given, the removal of foreign substances can be promoted, and the cleaning effect can be improved.

【0009】そして、清掃部材を長手方向に自動的に往
復移動させる移動手段を設けると、一定速度で移動可能
となり、清掃時の動作ばらつきがなくなって、安定した
清掃効果を達成できる。さらに、長手方向と直交する方
向である幅方向にも同時に移動させるようにすれば、清
掃部材が長手方向に1往復する間にやすり面の接触する
領域が大きくなり、より一層確実に異物を除去すること
が可能となる。
When a moving means for automatically reciprocating the cleaning member in the longitudinal direction is provided, the cleaning member can be moved at a constant speed, and there is no variation in operation during cleaning, and a stable cleaning effect can be achieved. Further, if the cleaning member is simultaneously moved in the width direction which is a direction orthogonal to the longitudinal direction, the contact area of the file surface becomes large while the cleaning member makes one reciprocation in the longitudinal direction, and the foreign matter is more reliably removed. It is possible to do.

【0010】このとき、清掃する時期を判別するため
に、スイッチ、タイマー、カウンタ等からの出力信号を
利用する。これによって、定期的に清掃を行ったり、あ
るいは画像形成前の起動時や画像形成を行っていないと
きに清掃を行うことができる。したがって、不要な清掃
が減るので、清掃部材の寿命を長くすることができると
ともに、現像剤担持体や層厚規制部材の破損も防止でき
る。
At this time, an output signal from a switch, a timer, a counter, or the like is used to determine a cleaning time. Accordingly, cleaning can be performed periodically, or cleaning can be performed at the time of activation before image formation or when image formation is not performed. Therefore, unnecessary cleaning is reduced, so that the life of the cleaning member can be prolonged, and damage to the developer carrier and the layer thickness regulating member can be prevented.

【0011】[0011]

【発明の実施の形態】(第1実施形態)第1実施形態の
電子写真方式の画像形成装置に使用される現像装置を図
1に示す。現像装置の構造は従来のものと変わらず、像
担持体1である感光体に対向して配置され、現像剤が収
容された現像剤ケース2に現像剤担持体3が回転自在に
内装されている。現像剤として、キャリアと平均粒径約
10μmの高抵抗トナーとの2成分現像剤が使用され、
現像剤担持体3としてはマグネットローラが使用され
る。現像剤担持体3の回転軸が現像剤ケース2に軸受を
介して回転自在に支持され、現像剤担持体3は、モータ
によって所定の速度で回転駆動され、図示しない撹拌ロ
ーラによって現像剤ケース2から供給された現像剤を磁
気的に吸着して、像担持体1の現像位置まで搬送する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a developing device used in an electrophotographic image forming apparatus according to a first embodiment. The structure of the developing device is the same as that of the related art, and the developing device is disposed so as to face the photoconductor as the image carrier 1, and the developer carrier 3 is rotatably mounted in a developer case 2 containing a developer. I have. As a developer, a two-component developer including a carrier and a high-resistance toner having an average particle size of about 10 μm is used,
As the developer carrier 3, a magnet roller is used. The rotating shaft of the developer carrier 3 is rotatably supported on the developer case 2 via a bearing, and the developer carrier 3 is driven to rotate at a predetermined speed by a motor, and is rotated by a stirring roller (not shown). Is magnetically attracted and transported to the developing position of the image carrier 1.

【0012】そして、現像位置よりも上流側の現像剤ケ
ース2内に層厚規制部材4が設けられ、その先端部分が
現像剤担持体3と長手方向にわたって所定の間隔、ここ
では1.5mmあけて対向するように配置される。層厚
規制部材4として、平板状のステンレス鋼が用いられ、
現像剤ケース2に固定されている。
A layer thickness regulating member 4 is provided in the developer case 2 on the upstream side of the developing position, and the leading end thereof is spaced apart from the developer carrier 3 by a predetermined distance in the longitudinal direction, here 1.5 mm. And are arranged to face each other. As the layer thickness regulating member 4, a flat stainless steel is used,
It is fixed to the developer case 2.

【0013】層厚規制部材4により現像剤担持体3の表
面に供給された現像剤の層厚が規制され、均一な厚さの
現像剤層5が形成される。規制された現像剤層5は、現
像剤担持体3の回転によって現像位置まで搬送される。
現像剤担持体3には摩擦帯電された現像剤と同じ極性の
電圧が印加されており、像担持体1上に形成された静電
潜像との電位差によって現像剤のトナーが像担持体1に
吸着され、静電潜像が現像される。
The layer thickness of the developer supplied to the surface of the developer carrier 3 is regulated by the layer thickness regulating member 4, so that the developer layer 5 having a uniform thickness is formed. The regulated developer layer 5 is transported to the developing position by the rotation of the developer carrier 3.
A voltage having the same polarity as the frictionally charged developer is applied to the developer carrier 3, and the toner of the developer is transferred to the image carrier 1 by a potential difference from an electrostatic latent image formed on the image carrier 1. And the electrostatic latent image is developed.

【0014】ここで、本現像装置には、層厚規制部材4
の先端部分を清掃するための清掃部材6が設けられてい
る。清掃部材6は、図2に示すように、現像剤担持体3
と層厚規制部材4との間に挿入され層厚規制部材4の先
端部分あるいはその近傍に接触する清掃板7と、これを
保持する保持体8とからなり、清掃板7が保持体8の底
面に接着等によって取り付けられ、保持体8が現像剤ケ
ース2に長手方向に移動自在に支持されている。
Here, the developing device includes a layer thickness regulating member 4.
Is provided with a cleaning member 6 for cleaning the front end portion of the cleaning member. The cleaning member 6 is, as shown in FIG.
A cleaning plate 7 inserted between the layer thickness regulating member 4 and the tip of the layer thickness regulating member 4 or in contact therewith, and a holder 8 for holding the same. The holder 8 is attached to the bottom surface by bonding or the like, and is supported by the developer case 2 so as to be movable in the longitudinal direction.

【0015】清掃板7は、層厚規制部材4よりも軟らか
い材料、例えばPETシートが用いられ、現像剤担持体
3と層厚規制部材4との隙間に挿入可能なように厚さ
0.5mmとされる。清掃板7の層厚規制部材4と対向
して摺接する摺接面にはやすり面9が形成され、清掃板
7自身の弾性力によって層厚規制部材4に押し付けられ
ている。また、清掃板7の摺接面とは反対側の裏面は平
滑な面とされており、この面が現像剤担持体3に接触し
ても損傷を与えることはない。しかも、清掃板7自身が
軟らかい材料からなるので、現像剤担持体3だけでなく
層厚規制部材4に対しても損傷を与えることはない。
The cleaning plate 7 is made of a material softer than the layer thickness regulating member 4, for example, a PET sheet, and has a thickness of 0.5 mm so that it can be inserted into the gap between the developer carrier 3 and the layer thickness regulating member 4. It is said. A file surface 9 is formed on a sliding contact surface of the cleaning plate 7 which is in sliding contact with the layer thickness regulating member 4, and is pressed against the layer thickness regulating member 4 by the elastic force of the cleaning plate 7 itself. Further, the rear surface of the cleaning plate 7 opposite to the sliding contact surface is a smooth surface, and even if this surface comes into contact with the developer carrying member 3, there is no damage. Moreover, since the cleaning plate 7 itself is made of a soft material, not only the developer carrier 3 but also the layer thickness regulating member 4 is not damaged.

【0016】やすり面9は、サンドペーパーを清掃板7
に接着して形成される。サンドペーパーの粗さは、30
0番以上の粗さとする。表1に示すように、1000
番、500番、300番、150番のサンドペーパーを
用いて清掃効果の評価を行ったところ、300番以上の
粗さでなければ良好な清掃能力が得られなかった。な
お、粗いサンドペーパーを使用すると、脱落した砥石が
現像剤担持体3を傷つける等の悪影響を及ぼすので、3
00番が最適である。
The file surface 9 is made of sandpaper and a cleaning plate 7.
It is formed by bonding to. Sandpaper roughness is 30
The roughness shall be No. 0 or more. As shown in Table 1, 1000
When the cleaning effect was evaluated using sandpapers No. 500, No. 300 and No. 150, good cleaning ability could not be obtained unless the roughness was No. 300 or more. If a rough sandpaper is used, the dropped whetstone has an adverse effect such as damaging the developer carrier 3.
No. 00 is optimal.

【0017】[0017]

【表1】 [Table 1]

【0018】また、やすり面9としては、層厚規制部材
4よりも軟らかい金属薄板の表面をやすり状に加工した
ものを清掃板7に接着するか、あるいはこの金属薄板自
体を清掃板7としてもよく、これによれば砥石が脱落す
ることはなく、清掃効果を長く維持できる。
As the file surface 9, a surface of a thin metal sheet softer than the layer thickness regulating member 4 processed into a file shape is bonded to the cleaning plate 7, or the thin metal plate itself may be used as the cleaning plate 7. Often, according to this, the grindstone does not fall off and the cleaning effect can be maintained for a long time.

【0019】保持体8は、合成樹脂材料によって形成さ
れ、現像剤ケース2と対向する側面に突起10が突設さ
れている。現像剤ケース2の前壁には、長手方向に溝1
1が形成され、この溝11に突起10が嵌め込まれるこ
とによって、保持体8は現像剤ケース2に沿って長手方
向に移動可能となる。
The holding member 8 is formed of a synthetic resin material, and has a projection 10 projecting from a side surface facing the developer case 2. The front wall of the developer case 2 has a groove 1 in the longitudinal direction.
1 is formed, and the protrusion 10 is fitted into the groove 11, so that the holder 8 can move in the longitudinal direction along the developer case 2.

【0020】ところで、図3に示すように、現像剤担持
体3には、現像剤層5が形成される現像領域とこの両側
にある現像剤層5が形成されない非現像領域とがあり、
層厚規制部材4の長さは、現像剤担持体3の長さよりは
短く、現像領域の長さよりも長くなっている。したがっ
て、清掃部材6は、現像装置が動作する画像形成時には
現像剤の搬送を邪魔しないようにどちらか一側の非現像
領域に対応する位置にある。そのため、溝11の長さ
は、層厚規制部材4の長さよりも長くなければならず、
現像剤担持体3の長さと同じか少し短くなっている。さ
らに、清掃部材6の長手方向の長さは非現像領域の長さ
よりも小さくしておけばよい。
As shown in FIG. 3, the developer carrier 3 has a developing area where the developer layer 5 is formed and a non-developing area where the developer layer 5 is not formed on both sides of the developing area.
The length of the layer thickness regulating member 4 is shorter than the length of the developer carrier 3 and longer than the length of the developing area. Therefore, the cleaning member 6 is located at a position corresponding to the non-developing area on one side so as not to hinder the conveyance of the developer during image formation in which the developing device operates. Therefore, the length of the groove 11 must be longer than the length of the layer thickness regulating member 4,
The length is the same as or slightly shorter than the length of the developer carrier 3. Further, the length of the cleaning member 6 in the longitudinal direction may be smaller than the length of the non-development area.

【0021】上記の現像装置を使用していると、図4に
示すように、現像剤担持体3と層厚規制部材4との間に
異物12が付着、停滞した場合、異物12が存在する箇
所では現像剤層5の厚さが均一にならず、現像剤担持体
3の円周方向に沿って現像剤層5の安定しない領域が生
じ、像担持体1上の静電潜像を正しく現像できなくな
る。そこで、手動で清掃部材6を長手方向に往復移動さ
せると、異物12が取り除かれて、層厚規制部材4の先
端部分が清掃される。このとき、層厚規制部材4に異物
12が固着していても、やすり面9が摺接して、異物1
2を削り取ることができ、層厚規制部材4の先端部分を
きれいにすることができる。これによって、図3に示す
ように、均一な現像剤層5が得られ、以後健全な現像を
行え、良好な印刷品位を維持することができる。また、
この清掃部材6を用いても現像剤担持体3や層厚規制部
材4を損傷することがないので、清掃回数を増やすこと
ができ、常に良好な画像形成を行え、しかも現像装置の
長寿命化を図れる。
When the above-described developing device is used, as shown in FIG. 4, when the foreign matter 12 adheres and stagnates between the developer carrier 3 and the layer thickness regulating member 4, the foreign matter 12 exists. In some places, the thickness of the developer layer 5 is not uniform, and an unstable area of the developer layer 5 is generated along the circumferential direction of the developer carrier 3, so that the electrostatic latent image on the image carrier 1 can be correctly corrected. Development becomes impossible. Therefore, when the cleaning member 6 is manually reciprocated in the longitudinal direction, the foreign matter 12 is removed, and the tip portion of the layer thickness regulating member 4 is cleaned. At this time, even if the foreign matter 12 is fixed to the layer thickness regulating member 4, the file surface 9 slides and the foreign matter 1
2 can be scraped off, and the tip portion of the layer thickness regulating member 4 can be cleaned. As a result, as shown in FIG. 3, a uniform developer layer 5 can be obtained, sound development can be performed thereafter, and good print quality can be maintained. Also,
Even if the cleaning member 6 is used, the developer carrier 3 and the layer thickness regulating member 4 are not damaged, so that the number of times of cleaning can be increased, good image formation can always be performed, and the life of the developing device can be extended. Can be achieved.

【0022】ここで、現像装置によっては、層厚規制部
材4が現像剤担持体3に接触しているものもあるが、図
5に示すように、上記と同様に清掃部材6を設けて、長
手方向に移動させればよい。層厚規制部材4が撓むこと
によって、清掃部材6の清掃板7が現像剤担持体3と層
厚規制部材4との間に挿入され、層厚規制部材4の現像
剤担持体3に接触する表面を清掃することができる。
Here, in some developing devices, the layer thickness regulating member 4 is in contact with the developer carrier 3, but as shown in FIG. 5, a cleaning member 6 is provided in the same manner as described above. What is necessary is just to move in a longitudinal direction. When the layer thickness regulating member 4 bends, the cleaning plate 7 of the cleaning member 6 is inserted between the developer carrier 3 and the layer thickness regulating member 4, and comes into contact with the developer carrier 3 of the layer thickness regulating member 4. Surface can be cleaned.

【0023】次に、他の形態の清掃部材6を図6に示
す。この清掃部材6では、清掃板7の裏面にゴム、エラ
ストマー等からなる弾性部材13が接着等によって取り
付けられている。ここでは、弾性部材13として、ウレ
タンスポンジ(硬度10度、厚さ2mm)を用いた。な
お、この弾性部材13の厚さは現像剤担持体3と層厚規
制部材4との間隔よりも厚いが、圧縮変形することによ
ってこの間隔に挿入可能とされ、しかも軟らかいので現
像剤担持体3を傷つけることもない。このように、弾性
部材13を組み合わせることによって、清掃板7は層厚
規制部材4に向かう方向に付勢されて押し付けられ、両
者の間隔が変動しても異物を除去するのに必要な接触圧
を与えることができる。したがって、常に安定した清掃
効果を発揮させることができる。
Next, another embodiment of the cleaning member 6 is shown in FIG. In this cleaning member 6, an elastic member 13 made of rubber, elastomer, or the like is attached to the back surface of the cleaning plate 7 by bonding or the like. Here, a urethane sponge (hardness 10 degrees, thickness 2 mm) was used as the elastic member 13. Although the thickness of the elastic member 13 is larger than the distance between the developer carrier 3 and the layer thickness regulating member 4, the elastic member 13 can be inserted into this space by compressive deformation and is soft. Does not hurt. As described above, by combining the elastic members 13, the cleaning plate 7 is urged and pressed in the direction toward the layer thickness regulating member 4, and the contact pressure required to remove foreign matter even when the distance between the two varies. Can be given. Therefore, a stable cleaning effect can always be exhibited.

【0024】また、他の形態として、図7に示すよう
に、清掃板7の長手方向の両側の側縁に三角形状の切欠
14を形成する。この切欠14を形成することによっ
て、異物を掻き取る能力が加わり、やすり面9の清掃効
果と相俟って確実に異物の除去を行える。なお、切欠1
4の形状は、側縁が凹凸になっていればよく、鋸歯状、
波形状でもよい。
As another form, as shown in FIG. 7, triangular cutouts 14 are formed at both side edges of the cleaning plate 7 in the longitudinal direction. By forming the notch 14, the ability to scrape foreign matter is added, and the foreign matter can be reliably removed together with the cleaning effect of the file surface 9. Notch 1
The shape of 4 only needs to have irregularities on the side edges,
The shape may be a wave.

【0025】上記の実施形態では、清掃を行う場合、清
掃部材6を手動で長手方向に移動させていたが、清掃部
材6を往復移動させる移動手段を設けると、自動的に行
うことができる。すなわち、図8に示すように、螺旋状
の溝が形成された回転軸15を長手方向に沿って設け、
回転軸15に保持体8を螺合して、正逆回転可能なモー
タ16を回転軸15に接続する。操作スイッチのオンに
よりモータ16が回転軸15を正逆方向に回転させる
と、清掃部材6は自動的に往復移動する。このとき、清
掃部材6は一定速度で安定した軌道を移動することにな
り、特別な技術を必要とせず、常に安定した清掃を行え
る。
In the above-described embodiment, when cleaning is performed, the cleaning member 6 is manually moved in the longitudinal direction. However, if the moving means for reciprocating the cleaning member 6 is provided, the cleaning can be performed automatically. That is, as shown in FIG. 8, a rotary shaft 15 having a spiral groove is provided along the longitudinal direction,
The holding body 8 is screwed onto the rotating shaft 15, and a motor 16 that can rotate forward and reverse is connected to the rotating shaft 15. When the motor 16 rotates the rotating shaft 15 in the forward and reverse directions by turning on the operation switch, the cleaning member 6 automatically reciprocates. At this time, the cleaning member 6 moves on a stable trajectory at a constant speed, so that stable cleaning can always be performed without requiring any special technique.

【0026】ここで、清掃は画像形成装置内の制御装置
からの駆動信号によって実行される。この清掃を行う時
期を判断するために、画像形成装置に備えられている電
源スイッチ、タイマー、カウンタ等からの出力を利用す
れば、適時自動的に清掃することができる。すなわち、
カウンタによって印刷枚数を計数しておき、一定枚数に
なったときモータ16を駆動して、清掃部材6を1往復
させる。例えば、寿命3000枚の現像装置において、
印刷枚数が500枚毎に清掃を実行するように設定す
る。このときの異物の発生結果を表2に示す。500枚
毎に清掃を行うと、全寿命にかけて異物はなかったが、
清掃をしない場合、印刷枚数が増えてくるにしたがって
異物が多く現れるようになった。
Here, the cleaning is executed by a drive signal from a control device in the image forming apparatus. If an output from a power switch, a timer, a counter, or the like provided in the image forming apparatus is used to determine when to perform the cleaning, the cleaning can be automatically performed in a timely manner. That is,
The number of printed sheets is counted by a counter, and when the number of printed sheets reaches a certain number, the motor 16 is driven to make the cleaning member 6 reciprocate once. For example, in a developing device having a life of 3000 sheets,
The cleaning is set to be performed every 500 printed sheets. Table 2 shows the result of the generation of foreign matter at this time. When cleaning was performed every 500 sheets, there was no foreign matter for the whole life,
Without cleaning, more foreign substances appeared as the number of prints increased.

【0027】[0027]

【表2】 [Table 2]

【0028】したがって、定期的に清掃を行えば、異物
が現れず、良好な印刷品位を維持することができる。し
かも、適時清掃が行われるので、清掃回数を必要最小限
に留めることが可能となって、清掃部材6の疲労が少な
く、清掃効果の低下や清掃部材6の破損を防止でき、長
期的に十分な清掃を実現できる。なお、印刷枚数の代わ
りに、現像剤担持体3の積算された回転数、現像装置の
総運転時間を計数して、一定の周期で清掃を実行しても
よい。
Therefore, if the cleaning is performed periodically, foreign matters do not appear and good print quality can be maintained. In addition, since the cleaning is performed in a timely manner, the number of times of cleaning can be kept to a necessary minimum, the fatigue of the cleaning member 6 is reduced, the cleaning effect is prevented from being lowered, and the cleaning member 6 can be prevented from being damaged. Cleaning can be realized. Instead of the number of printed sheets, the accumulated number of rotations of the developer carrier 3 and the total operation time of the developing device may be counted, and the cleaning may be performed at a constant cycle.

【0029】また、画像形成装置の起動時、すなわち電
源スイッチがオンされたときに清掃を実行するように制
御しておくと、異物の有無の確認なしで自動的に清掃が
行われ、常に異物のない状態を維持できる。また、非画
像形成時に清掃を実行するように制御しておくと、印刷
画像に関係なしに清掃が行われ、清掃によって画像形成
が一時中止となるような事態を避けることができ、待機
時間を有効に利用できる。
If the image forming apparatus is controlled so as to perform the cleaning when the image forming apparatus is started, that is, when the power switch is turned on, the cleaning is automatically performed without confirming the presence or absence of the foreign matter, and the foreign matter is always checked. Can be maintained. In addition, if control is performed so that cleaning is performed at the time of non-image formation, cleaning is performed irrespective of a print image, and a situation in which image formation is temporarily stopped due to cleaning can be avoided. Can be used effectively.

【0030】(第2実施形態)本実施形態の現像装置に
おける清掃部材6は、図9に示すように、長手方向と直
交する方向である幅方向に移動可能とされる。すなわ
ち、現像剤ケース2の上面あるいは両側の側面に沿って
移動自在な移動部材17を設け、移動部材17の前面に
清掃部材6の突起10と係合する溝11を形成して、清
掃部材6を長手方向に移動自在に支持する。移動部材1
7を幅方向に移動させることによって、清掃部材6も幅
方向に移動する。その他の構成は上記第1実施形態と同
じである。
(Second Embodiment) As shown in FIG. 9, the cleaning member 6 in the developing device of the present embodiment can be moved in the width direction which is a direction orthogonal to the longitudinal direction. That is, a movable member 17 that can move along the upper surface or both side surfaces of the developer case 2 is provided, and a groove 11 that engages with the projection 10 of the cleaning member 6 is formed on the front surface of the movable member 17, and Are movably supported in the longitudinal direction. Moving member 1
By moving the cleaning member 7 in the width direction, the cleaning member 6 also moves in the width direction. Other configurations are the same as those of the first embodiment.

【0031】このように清掃部材6が幅方向に移動する
ことによって、層厚規制部材4に接触するやすり面9の
位置を変えることができ、図10に示すように、清掃部
材6を徐々に現像剤ケース2から離れるように移動させ
ていくと、最終的にやすり面9の幅方向全域が層厚規制
部材4と接触することになる。したがって、何度も清掃
を繰り返してやすり面9が摩耗して清掃効果を発揮でき
なくなると、清掃部材6を幅方向に移動させればよく、
新しいやすり面9が層厚規制部材4に接触するので、再
び清掃効果を発揮でき、長期にわたり良好な清掃を行え
る。この場合、清掃回数をカウンタで計数しておき、所
定の回数になれば報知して、清掃部材6を幅方向に移動
させるようにすればよい。
By moving the cleaning member 6 in the width direction in this way, the position of the file surface 9 that contacts the layer thickness regulating member 4 can be changed, and as shown in FIG. 10, the cleaning member 6 is gradually moved. As the developer is moved away from the developer case 2, the entire area of the file surface 9 in the width direction eventually comes into contact with the layer thickness regulating member 4. Therefore, when the file surface 9 is worn out due to repeated cleaning and the cleaning effect cannot be exerted, the cleaning member 6 may be moved in the width direction.
Since the new file surface 9 comes into contact with the layer thickness regulating member 4, the cleaning effect can be exhibited again, and good cleaning can be performed for a long time. In this case, the number of times of cleaning may be counted by a counter, and if the number of times reaches a predetermined number, a notification is issued, and the cleaning member 6 may be moved in the width direction.

【0032】ところで、上記のように定期的に清掃部材
6を幅方向に移動させる代わりに、清掃を行うときに自
動的に幅方向に移動させることも可能である。すなわ
ち、清掃部材6を長手方向に往復移動させながら幅方向
にも移動させる移動手段を設ける。具体的には、図11
に示すように、現像剤ケース2の前壁に正弦波形のガイ
ド部材18を設け、これに清掃部材6の突起10を摺接
させて、清掃部材6を長手方向に移動させる。長手方向
への移動手段は第1実施形態と同じである。
Instead of periodically moving the cleaning member 6 in the width direction as described above, it is also possible to automatically move the cleaning member 6 in the width direction when performing cleaning. That is, a moving means for moving the cleaning member 6 in the width direction while reciprocating in the longitudinal direction is provided. Specifically, FIG.
As shown in (1), a guide member 18 having a sinusoidal waveform is provided on the front wall of the developer case 2, and the protrusion 10 of the cleaning member 6 is slidably contacted with the guide member 18 to move the cleaning member 6 in the longitudinal direction. The moving means in the longitudinal direction is the same as in the first embodiment.

【0033】これにより、清掃部材6が長手方向に移動
するにつれて突起10がガイド部材18に沿って摺動す
るので、清掃部材6はガイド部材18の形状に応じて幅
方向に移動する。したがって、層厚規制部材4の先端部
分では、やすり面9によって一方向に擦られるのではな
く、異なる方向に擦られることになり、こびりついた異
物でも取り除くことができ、清掃効果を向上できる。ま
た、やすり面9全域を使うので、均等に摩耗していき、
常に安定した清掃効果が得られる。
As a result, the protrusion 10 slides along the guide member 18 as the cleaning member 6 moves in the longitudinal direction, so that the cleaning member 6 moves in the width direction according to the shape of the guide member 18. Therefore, the tip portion of the layer thickness regulating member 4 is not rubbed in one direction by the file surface 9, but is rubbed in a different direction, so that even a stuck foreign matter can be removed, and the cleaning effect can be improved. Also, since the entire area of the file 9 is used, it will wear evenly,
A stable cleaning effect is always obtained.

【0034】ここで、ガイド部材18の形状として、正
弦波形の他に矩形波形、三角波形にしてもよい。清掃効
果の点では矩形波形が最もよく、正弦波形と三角波形は
同等であった。ただし、正弦波形にすると、機構的に簡
単な構成でよく、しかもスムーズに清掃部材6を移動さ
せることができ、他の部材に不要な負荷をかけないです
むので、総合的に見て正弦波形とするのが最適である。
Here, the shape of the guide member 18 may be a rectangular waveform or a triangular waveform in addition to a sine waveform. In terms of the cleaning effect, the rectangular waveform was the best, and the sine waveform and the triangular waveform were equivalent. However, when the sine waveform is used, the cleaning member 6 can be moved smoothly with a simple mechanical structure, and unnecessary load is not applied to other members. It is most suitable.

【0035】そして、清掃部材6の軌跡を正弦波形とな
るようにしたとき、やすり面9の長手方向の長さは、正
弦波形の1周期よりも大きくしておく。また、やすり面
9の幅方向の長さは、正弦波形の振幅よりも大にしてお
く。例えば、やすり面9の長さを15mmとすると、正
弦波形の周期を10mmとし、幅方向に1往復する間に
長手方向に移動する距離は、やすり面9の長さよりも小
となる。
When the trajectory of the cleaning member 6 has a sinusoidal waveform, the length of the file surface 9 in the longitudinal direction is longer than one cycle of the sinusoidal waveform. The length of the file surface 9 in the width direction is set to be larger than the amplitude of the sine waveform. For example, if the length of the file surface 9 is 15 mm, the period of the sinusoidal waveform is 10 mm, and the distance traveled in the longitudinal direction during one reciprocation in the width direction is smaller than the length of the file surface 9.

【0036】これによって、清掃部材6が長手方向に一
度移動すると、やすり面9が接触する領域は、幅方向の
長さが(やすり面9の幅方向の長さ+正弦波形の振幅)
となる矩形状となる。すなわち、層厚規制部材4は長手
方向全体に必ず清掃部材6によって1往復以上摺接され
ることになり、より一層清掃効果を高めることができ
る。
Thus, once the cleaning member 6 moves in the longitudinal direction, the area where the file surface 9 comes into contact has a length in the width direction (the length of the file surface 9 in the width direction + the amplitude of the sine waveform).
It becomes a rectangular shape. That is, the layer thickness regulating member 4 is always slid one or more times in the entire longitudinal direction by the cleaning member 6, so that the cleaning effect can be further enhanced.

【0037】なお、本発明は、上記実施形態に限定され
るものではなく、本発明の範囲内で上記実施形態に多く
の修正および変更を加え得ることは勿論である。清掃部
材の長手方向への移動手段として、保持体をベルトに固
定してベルトを回してもよい。また、清掃部材を幅方向
にのみ移動可能に設け、清掃部材を現像剤担持体と層厚
規制部材との間に出し入れしながら清掃を行うようにし
てもよい。
It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. As a means for moving the cleaning member in the longitudinal direction, the holding member may be fixed to the belt and the belt may be rotated. Alternatively, the cleaning member may be provided so as to be movable only in the width direction, and the cleaning may be performed while taking the cleaning member in and out between the developer carrying member and the layer thickness regulating member.

【0038】[0038]

【発明の効果】以上の説明から明らかな通り、本発明に
よると、清掃部材のやすり面によって層厚規制部材に固
着した異物を削り取ることができ、現像剤担持体と層厚
規制部材との間に存在する異物を完全に取り除くことが
できる。したがって、現像剤担持体上に均一な現像剤層
を形成することができ、静電潜像に対して正確な現像を
行え、良好な印刷品位が得られる。
As is apparent from the above description, according to the present invention, foreign matters adhered to the layer thickness regulating member can be scraped off by the file surface of the cleaning member, and the gap between the developer carrier and the layer thickness regulating member can be removed. Can be completely removed. Therefore, a uniform developer layer can be formed on the developer carrier, accurate development can be performed on the electrostatic latent image, and good print quality can be obtained.

【0039】また、清掃部材を長手方向だけでなく幅方
向にも移動させるようにすることによって、一度の清掃
によって層厚規制部材に摺接するやすり面の延べ面積が
大きくなり、異物を除去できる確率が高まり、より一層
清掃効果を向上させることができる。
Further, by moving the cleaning member not only in the longitudinal direction but also in the width direction, the total area of the file surface which slides on the layer thickness regulating member by one cleaning is increased, and the probability of removing foreign matter is increased. And the cleaning effect can be further improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1実施形態の現像装置の概略断面図FIG. 1 is a schematic sectional view of a developing device according to a first embodiment of the present invention.

【図2】清掃部材の斜視図FIG. 2 is a perspective view of a cleaning member.

【図3】現像装置の正面図FIG. 3 is a front view of the developing device.

【図4】清掃中における現像装置の正面図FIG. 4 is a front view of the developing device during cleaning.

【図5】他の形態の現像装置の概略断面図FIG. 5 is a schematic sectional view of a developing device of another embodiment.

【図6】他の形態の清掃部材の斜視図FIG. 6 is a perspective view of a cleaning member according to another embodiment.

【図7】他の形態の清掃部材の斜視図FIG. 7 is a perspective view of a cleaning member according to another embodiment.

【図8】清掃部材の移動手段の機構を示す図FIG. 8 is a diagram showing a mechanism of a moving unit of the cleaning member.

【図9】第2実施形態の現像装置の概略断面図FIG. 9 is a schematic sectional view of a developing device according to a second embodiment.

【図10】清掃部材を幅方向に移動させたときの現像装
置の概略断面図
FIG. 10 is a schematic sectional view of the developing device when the cleaning member is moved in the width direction.

【図11】清掃部材を長手方向に移動させながら幅方向
に移動させる機構を備えた現像装置の平面図
FIG. 11 is a plan view of a developing device having a mechanism for moving the cleaning member in the width direction while moving the cleaning member in the longitudinal direction.

【符号の説明】[Explanation of symbols]

2 現像剤ケース 3 現像剤担持体 4 層厚規制部材 6 清掃部材 7 清掃板 8 保持体 9 やすり面 13 弾性部材 14 切欠 17 移動部材 18 ガイド部材 Reference Signs List 2 developer case 3 developer carrier 4 layer thickness regulating member 6 cleaning member 7 cleaning plate 8 holder 9 file surface 13 elastic member 14 notch 17 moving member 18 guide member

───────────────────────────────────────────────────── フロントページの続き (72)発明者 若田 茂之 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 (72)発明者 荒木 広重 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 (72)発明者 大塚 義則 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 Fターム(参考) 2H077 AD06 AD13 AD17 AD18 BA01 CA01 DB10 FA01 FA04 FA22 GA03  ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeyuki Wakata 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka Inside (72) Inventor Hiroshige Araki 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp (72) Inventor Yoshinori Otsuka 22-22, Nagaike-cho, Abeno-ku, Osaka City, Osaka F-term (reference) 2H077 AD06 AD13 AD17 AD18 BA01 CA01 DB10 FA01 FA04 FA22 GA03

Claims (14)

【特許請求の範囲】[Claims] 【請求項1】 現像剤を担持して現像位置まで移動させ
る現像剤担持体と、該現像剤担持体に先端部分が接触あ
るいは所定の間隔をおいて対向配置され現像剤担持体上
の現像剤の層厚を規制する層厚規制部材と、該層厚規制
部材の先端部分を清掃する清掃部材とを備え、該清掃部
材は前記層厚規制部材に対して移動自在とされ、前記層
厚規制部材の先端部分に接触する前記清掃部材の摺接面
にやすり面が形成されたことを特徴とする現像装置。
1. A developer carrying member for carrying a developer and moving to a developing position, and a developer on the developer carrying member having a leading end contacting the developer carrying member or opposed to the developer carrying member at a predetermined interval. A thickness regulating member for regulating the thickness of the layer, and a cleaning member for cleaning a tip portion of the thickness regulating member, wherein the cleaning member is movable with respect to the thickness regulating member, A developing device, wherein a file surface is formed on a sliding contact surface of the cleaning member that contacts a tip portion of the member.
【請求項2】 清掃部材の現像剤担持体と対向する表面
が平滑にされたことを特徴とする請求項1記載の現像装
置。
2. The developing device according to claim 1, wherein a surface of the cleaning member facing the developer carrier is smoothed.
【請求項3】 清掃部材は層厚規制部材よりも軟らかい
材料からなることを特徴とする請求項1記載の現像装
置。
3. The developing device according to claim 1, wherein the cleaning member is made of a material softer than the layer thickness regulating member.
【請求項4】 清掃部材を層厚規制部材に接触する方向
に付勢する弾性部材が設けられたことを特徴とする請求
項1記載の現像装置。
4. The developing device according to claim 1, further comprising an elastic member for urging the cleaning member in a direction in which the cleaning member contacts the layer thickness regulating member.
【請求項5】 清掃部材の移動方向側の側縁に凹凸が形
成されたことを特徴とする請求項1記載の現像装置。
5. The developing device according to claim 1, wherein irregularities are formed on a side edge of the cleaning member on the moving direction side.
【請求項6】 清掃部材を長手方向に往復移動させる移
動手段が設けられたことを特徴とする請求項1〜5のい
ずれかに記載の現像装置。
6. The developing device according to claim 1, further comprising moving means for reciprocating the cleaning member in a longitudinal direction.
【請求項7】 清掃部材が長手方向と直交する幅方向に
移動可能に設けられたことを特徴とする請求項1〜5の
いずれかに記載の現像装置。
7. The developing device according to claim 1, wherein the cleaning member is provided so as to be movable in a width direction orthogonal to the longitudinal direction.
【請求項8】 清掃部材を長手方向に往復移動させなが
ら長手方向と直交する幅方向に移動させる移動手段が設
けられたことを特徴とする請求項7記載の現像装置。
8. The developing device according to claim 7, further comprising moving means for moving the cleaning member in a width direction orthogonal to the longitudinal direction while reciprocating the cleaning member in the longitudinal direction.
【請求項9】 清掃部材の軌跡が正弦波形となるように
清掃部材を案内するガイド部材が設けられたことを特徴
とする請求項8記載の現像装置。
9. The developing device according to claim 8, further comprising a guide member for guiding the cleaning member so that the trajectory of the cleaning member has a sine waveform.
【請求項10】 清掃部材のやすり面の長手方向の長さ
は、幅方向に1往復する間に長手方向に移動する距離よ
りも大とされたことを特徴とする請求項8記載の現像装
置。
10. The developing device according to claim 8, wherein the length of the file surface of the cleaning member in the longitudinal direction is longer than the length of the file moving in the longitudinal direction during one reciprocation in the width direction. .
【請求項11】 層厚規制部材の清掃時期を判別して、
その時期がきたときに移動手段を作動させる制御手段が
設けられたことを特徴とする請求項6または8記載の現
像装置。
11. A cleaning time of the layer thickness regulating member is determined,
9. The developing device according to claim 6, further comprising control means for operating the moving means when the time comes.
【請求項12】 制御手段は、清掃時期を起動時に設定
したことを特徴とする請求項11記載の現像装置。
12. The developing device according to claim 11, wherein the control unit sets the cleaning time at the time of startup.
【請求項13】 制御手段は、現像装置の運転状態を計
数して、この計数結果に基づいて一定の周期で清掃を実
行することを特徴とする請求項11記載の現像装置。
13. The developing device according to claim 11, wherein the control unit counts the operating state of the developing device and executes cleaning at a constant cycle based on the counted result.
【請求項14】 制御手段は、清掃時期を非画像形成時
に設定したことを特徴とする請求項11記載の現像装
置。
14. The developing device according to claim 11, wherein the control unit sets the cleaning time during non-image formation.
JP35899699A 1999-12-17 1999-12-17 Developing device Pending JP2001175078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35899699A JP2001175078A (en) 1999-12-17 1999-12-17 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35899699A JP2001175078A (en) 1999-12-17 1999-12-17 Developing device

Publications (1)

Publication Number Publication Date
JP2001175078A true JP2001175078A (en) 2001-06-29

Family

ID=18462208

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2001175078A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006301239A (en) * 2005-04-20 2006-11-02 Ricoh Co Ltd Developing device, process cartridge, and image forming apparatus
US7546071B2 (en) * 2006-03-03 2009-06-09 Sharp Kabushiki Kaisha Developing device for prevention of coagulate toner adherence and image forming apparatus using the developing device
US7689140B2 (en) 2005-11-15 2010-03-30 Sharp Kabushiki Kaisha Blade cleaning jig
CN104516238A (en) * 2013-10-07 2015-04-15 富士施乐株式会社 Developing device and image forming apparatus
JP2017194532A (en) * 2016-04-19 2017-10-26 株式会社リコー Development device and image formation apparatus
JP2018005027A (en) * 2016-07-05 2018-01-11 京セラドキュメントソリューションズ株式会社 Developing device and image forming apparatus including the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006301239A (en) * 2005-04-20 2006-11-02 Ricoh Co Ltd Developing device, process cartridge, and image forming apparatus
JP4707175B2 (en) * 2005-04-20 2011-06-22 株式会社リコー Developing device, process cartridge, and image forming apparatus
US7689140B2 (en) 2005-11-15 2010-03-30 Sharp Kabushiki Kaisha Blade cleaning jig
US7546071B2 (en) * 2006-03-03 2009-06-09 Sharp Kabushiki Kaisha Developing device for prevention of coagulate toner adherence and image forming apparatus using the developing device
CN104516238A (en) * 2013-10-07 2015-04-15 富士施乐株式会社 Developing device and image forming apparatus
JP2015075524A (en) * 2013-10-07 2015-04-20 富士ゼロックス株式会社 Developing unit and image forming apparatus
JP2017194532A (en) * 2016-04-19 2017-10-26 株式会社リコー Development device and image formation apparatus
JP2018005027A (en) * 2016-07-05 2018-01-11 京セラドキュメントソリューションズ株式会社 Developing device and image forming apparatus including the same

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