JP2021184012A - 現像装置およびそれを備えた画像形成装置 - Google Patents
現像装置およびそれを備えた画像形成装置 Download PDFInfo
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- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
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- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
- G03G15/0889—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for agitation or stirring
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- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
- G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers
- G03G15/0893—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers in a closed loop within the sump of the developing device
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- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0844—Arrangements for purging used developer from the developing unit
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
- G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/095—Removing excess solid developer, e.g. fog preventing
Abstract
Description
3a〜3d 現像装置
20 現像容器
20a 第1仕切壁
20c 第2仕切壁
22e 上流側連通部(第1連通部)
20f 下流側連通部(第2連通部)
20g 現像剤補給口
20h 現像剤排出部
21 攪拌搬送室(第1搬送室)
22 供給搬送室(第2搬送室)
25 攪拌搬送スクリュー(第1攪拌搬送部材)
26 供給搬送スクリュー(第2攪拌搬送部材)
31 現像ローラー(現像剤担持体)
52 規制部
53 排出羽根
55 円板
60 段差部
100 画像形成装置
Claims (6)
- 互いに並列配置される第1搬送室および第2搬送室と、
前記第1搬送室および前記第2搬送室を長手方向に沿って区画する第1仕切壁と、
前記第1仕切壁の両端部側で前記第1搬送室および前記第2搬送室を連通させる連通部と、
磁性キャリアとトナーとを含む現像剤を補給する現像剤補給口と、
前記第2搬送室の下流側端部に設けられ、余剰の前記現像剤が排出される現像剤排出部と、を有する現像容器と、
前記現像容器に回転可能に支持され、前記第2搬送室内の前記現像剤を表面に担持する現像剤担持体と、
回転軸と、前記回転軸の外周面に形成される第1搬送羽根とを有し、前記第1搬送室内の前記現像剤を第1方向に攪拌、搬送する第1攪拌搬送部材と、
回転軸と、前記回転軸の外周面に形成される第2搬送羽根とを有し、前記第2搬送室内の前記現像剤を前記第1方向と逆方向である第2方向に攪拌、搬送する第2攪拌搬送部材と、
を備え、
前記第2攪拌搬送部材は、
前記第2方向に対し前記第2搬送羽根の下流側に隣接して形成され、前記第2搬送羽根と逆方向に前記現像剤を搬送する搬送羽根で構成される規制部と、
前記第2方向に対し前記規制部の下流側に隣接して形成され、前記第2搬送羽根と同方向に現像剤を搬送して前記現像剤排出部から前記現像剤を排出する排出羽根と、
を備える現像装置において、
前記連通部は、前記第1方向の下流側において前記第1搬送室から前記第2搬送室に前記現像剤を受け渡す第1連通部と、前記第2方向の下流側において前記第2搬送室から前記第1搬送室に前記現像剤を受け渡す第2連通部と、で構成され、
前記現像容器は、前記第2方向に対し前記第2連通部の下流側において前記規制部に隣接して配置され、前記第1搬送室および前記規制部を区画する第2仕切壁を有し、
前記第2仕切壁の上端部と前記現像容器の内面との間隔は、前記第1螺旋羽根および前記規制部の上端部と前記現像容器の内面との間隔よりも大きいことを特徴とする現像装置。 - 前記第2仕切壁の上方に前記現像剤補給口を設けたことを特徴とする請求項1に記載の現像装置。
- 前記第2仕切壁の上端部に対向する前記現像容器の内面に、上向きに凹となる段差部を形成したことを特徴とする請求項1又は請求項2に記載の現像装置。
- 前記第2仕切壁は、前記第1仕切壁に比べて高さが低いことを特徴とする請求項1乃至請求項3のいずれかに記載の現像装置。
- 前記第1攪拌搬送部材および前記第2攪拌搬送部材の回転速度を複数段階に切り換え可能であることを特徴とする請求項1乃至請求項4のいずれかに記載の現像装置。
- 静電潜像が形成される像担持体と、
前記像担持体上に形成された前記静電潜像をトナー像に現像する請求項1乃至請求項5のいずれかに記載の現像装置と、
を含み、記録媒体に画像を形成する画像形成部を備えた画像形成装置。
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JP2020088775A JP7484412B2 (ja) | 2020-05-21 | 現像装置およびそれを備えた画像形成装置 | |
US17/322,198 US11209752B2 (en) | 2020-05-21 | 2021-05-17 | Developing device and image forming apparatus therewith |
CN202110540693.3A CN113703300B (zh) | 2020-05-21 | 2021-05-18 | 显影装置和具备显影装置的图像形成装置 |
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US11209752B2 (en) | 2021-12-28 |
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