JPH0513316B2 - - Google Patents
Info
- Publication number
- JPH0513316B2 JPH0513316B2 JP58157121A JP15712183A JPH0513316B2 JP H0513316 B2 JPH0513316 B2 JP H0513316B2 JP 58157121 A JP58157121 A JP 58157121A JP 15712183 A JP15712183 A JP 15712183A JP H0513316 B2 JPH0513316 B2 JP H0513316B2
- Authority
- JP
- Japan
- Prior art keywords
- developing
- developer
- roll
- rolls
- developing roll
- 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 - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 description 16
- 238000010586 diagram Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、複写機の現像装置に係り、特に、
現像ロールの表面に磁気ブラシを形成しながら現
像剤を搬送して現像を行う現像装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a developing device for a copying machine, and in particular,
The present invention relates to a developing device that performs development by conveying developer while forming a magnetic brush on the surface of a developing roll.
従来、この種の現像装置として、第１図及び第
２図に示すように、現像ロール２ａ，２ｂのセツ
ト位置が感光体１に対して時計の３時又は９時の
位置であり、かつ、この現像ロール２ａ，２ｂが
感光体１と同じ方向に回転して現像を行う、いわ
ゆるウイツズモード（with mode）の現像装置
が知られている。そして、このようなウイツズモ
ードの現像装置は、その現像ロール２ａ，２ｂの
表面に磁気ブラシを形成しながら搬送される現像
剤３の流れ３ａの方向が感光体の回転方向と同じ
方向になるため、現像剤３の流れ３ａに攪乱が生
じることが少くてその搬送が円滑になり、現像剤
３どうしの衝突等による現像剤の劣化が少いほ
か、背面汚れの現象がなく、しかも、広面積像の
均一な再現が可能である等の特長を備えている。
Conventionally, in this type of developing device, as shown in FIGS. 1 and 2, the set position of the developing rolls 2a and 2b is at the 3 o'clock or 9 o'clock position with respect to the photoreceptor 1, and, A so-called with mode developing device is known in which the developing rolls 2a and 2b rotate in the same direction as the photoreceptor 1 to perform development. In such a Wits mode developing device, the direction of the flow 3a of the developer 3 that is conveyed while forming magnetic brushes on the surfaces of the developing rolls 2a and 2b is the same direction as the rotational direction of the photoreceptor. There is less disturbance in the flow 3a of the developer 3, and its conveyance is smoother, and there is less deterioration of the developer due to collisions between the developer 3, etc., and there is no back dirt phenomenon, and moreover, it is possible to image a wide area. It has features such as being able to uniformly reproduce images.
しかしながら、このタイプの現像装置において
は、この装置内のパドル４ですくい上げられた現
像剤３が現像ロール２ａ，２ｂの背面を上昇し、
上方に位置する現像ロール２ａの上方を回り込ん
でから感光体１とこの現像ロール２ａ，２ｂとの
間を下降する。このため、現像剤３の搬送性が悪
く、現像ロール２ａ，２ｂの磁極と磁力の選択や
２本の現像ロール２ａ，２ｂを使用した場合には
そのロール間隔の選択が難かしくなる。しかも、
現像剤３について現像ロール２ａ，２ｂの背面搬
送が行なわれるために現像ロール２ａ，２ｂに組
み込まれるマグネツトの数が多くなり、例えば第
２図に示すように、上方の現像ロール２ａについ
ては７本のマグネツトを必要とし、また、下方の
現像ロール２ｂについては８本のマグネツトが必
要となり、それだけ大径の現像ロール２ａ，２ｂ
が必要となり、その結果、感光体１の３時又は９
時の位置に多数本の現像ロールを配設して現像性
能の向上を図ることが難かしかつた。 However, in this type of developing device, the developer 3 scooped up by the paddle 4 in this device rises on the back side of the developing rolls 2a and 2b.
It goes around above the developing roll 2a located above and then descends between the photoreceptor 1 and the developing rolls 2a and 2b. For this reason, the conveyance of the developer 3 is poor, making it difficult to select the magnetic poles and magnetic force of the developing rolls 2a and 2b, and to select the roll spacing when two developing rolls 2a and 2b are used. Moreover,
Since the developer 3 is conveyed from the rear side of the developing rolls 2a and 2b, the number of magnets incorporated in the developing rolls 2a and 2b increases. For example, as shown in FIG. In addition, eight magnets are required for the lower developing roll 2b, and the developing rolls 2a, 2b have a correspondingly larger diameter.
As a result, 3 o'clock or 9 o'clock of photoreceptor 1 is required.
It has been difficult to improve the developing performance by disposing a large number of developing rolls at different positions.
従つて、本発明の目的は、ウイツズモードの現
像装置において、現像剤について現像ロールの背
面搬送をなくし、また、現像ロールに組み込まれ
る磁石の数を減少さてせ現像ロールを小径にし、
これによつて感光体の３時又は９時の位置に多数
本の現像ロールを配設して現像性能の向上を図る
ことができるようにした複写機の現像装置を提供
することにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the rear conveyance of the developing roll for the developer in a Wits mode developing device, reduce the number of magnets incorporated in the developing roll, and make the developing roll small in diameter.
Thus, it is an object of the present invention to provide a developing device for a copying machine in which a large number of developing rolls can be disposed at the 3 o'clock or 9 o'clock position of the photoreceptor to improve the developing performance.
すなわち、本発明は、複写機の感光体に対する
複数の現像ロールのセツト位置が時計の３時又は
９時の位置であつて上記複数の現像ロールがいず
れも感光体と同じ方向に回転し且つ現像剤が感光
体とそれら現像ロールとの間を各現像ロール表面
で磁気ブラシを形成しながら順次下降して現像を
行う現像装置で、上記現像ロールと現像剤をすく
い上げて現像ロールに供給するパドルとの間に現
像剤搬送用マグネツトロールを設け、このマグネ
ツトロールによりパドルから供給された現像剤を
最上方にセツトされた現像ロールに供給するよう
にした現像装置である。この現像装置によれば、
マグネツトロールが現像剤を複数の現像剤ロール
のうち最上方にセツトされた現像ロールまで搬送
するので、複数の現像ロールによる背面搬送をな
くすことができるほか、この各現像ロールの背面
側の磁石を省略することができる。
That is, in the present invention, the set position of the plurality of developing rolls relative to the photoreceptor of a copying machine is at the 3 o'clock or 9 o'clock position, and the plurality of developing rolls all rotate in the same direction as the photoreceptor, and the developing rolls are rotated in the same direction as the photoreceptor. A developing device that performs development by lowering the developer sequentially between the photoreceptor and the developing rolls while forming a magnetic brush on the surface of each developing roll. In this developing device, a developer conveying magnet roll is provided between the two, and the developer supplied from the paddle is supplied by this magnet roll to the developing roll set at the uppermost position. According to this developing device,
Since the magnet roll transports the developer to the uppermost developing roll of the multiple developer rolls, it is possible to eliminate rear transport by multiple developer rolls. can be omitted.
以下、添付図面に示す実施例に基づいて、本発
明の現像装置を具体的に説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The developing device of the present invention will be specifically described below based on embodiments shown in the accompanying drawings.
第３図及び第４図において、本発明の実施例に
係る現像装置が示されている。この実施例に示す
現像装置は、上記第１図に示す従来の現像装置と
同様に、感光体１にはその時計の３時の位置に上
下一対の現像ロール２ａ，２ｂが配設されてお
り、これら各現像ロール２ａ，２ｂが共に上記感
光体１と同じ方向に回転し、現像剤３が上方の現
像ロール２ａの上方を回り込んでこれら感光体１
と各現像ロール２ａ，２ｂとの間をこれら各現像
ロール２ａ，２ｂの表面で磁気ブラシを形成しな
がら下降して現像を行う、いわゆるウイツズモー
ド（with mode）の現像装置であり、そして、
上記上方の現像ロール２ａと現像剤３をすくい上
げて各現像ロール２ａ，２ｂに供給するパドル４
との間にはこのパドル４ですくい上げられた現像
剤３を上方の現像ロール２ａの上部まで搬送する
現像剤搬送用マグネツトロール５が配設されてい
る。なお、上方の現像ロールに対する現像剤搬送
用マグネツトロール５による現像剤の搬送位置
は、この実施例で示すような上方の現像ロール２
ａの上部位置が好ましいが、これに限定されな
い。 3 and 4, a developing device according to an embodiment of the present invention is shown. The developing device shown in this embodiment is similar to the conventional developing device shown in FIG. , these developing rolls 2a and 2b both rotate in the same direction as the photoreceptor 1, and the developer 3 goes around above the upper developing roll 2a and rotates around the photoreceptor 1.
This is a so-called with mode developing device that performs development by descending between the developing rollers 2a and 2b while forming magnetic brushes on the surfaces of the developing rollers 2a and 2b.
A paddle 4 that scoops up the upper developing roll 2a and the developer 3 and supplies it to each developing roll 2a, 2b.
A developer conveying magnetic roll 5 is disposed between the developer roller 2a and the developer roller 2a to convey the developer 3 scooped up by the paddle 4 to the upper part of the upper developing roller 2a. Note that the position where the developer is conveyed by the developer conveying magnet roll 5 with respect to the upper developing roll is as shown in this embodiment.
Although the upper position of a is preferable, it is not limited thereto.
この実施例において、各現像ロール２ａ，２ｂ
に組み込まれるマグネツトは、第４図に示すよう
に、上方の現像ロール２ａについては現像剤搬送
用マグネツトロール５側の背面上部から感光体１
側の前面下部におけてN3→S2→N2→S1→N1の順
に５本配設されており、また、下方の現像ロール
２ｂについては感光体１側の前面上部から前面下
部におけてN2→S2→N1→S1→N3の順に５本配設
されている。 In this embodiment, each developing roll 2a, 2b
As shown in FIG. 4, for the upper developing roll 2a, the magnet incorporated in the photoreceptor 1
Five rollers are arranged in the order of N 3 → S 2 → N 2 → S 1 → N 1 at the front lower part of the side, and for the lower developing roll 2b, from the front upper part to the front lower part of the photoreceptor 1 side. Five of them are arranged in the order of N 2 →S 2 →N 1 →S 1 →N 3 .
そして、上記パドル４によつてすくい上げられ
た現像剤３は、上記現像剤搬送用マグネツトロー
ル５によつて上方の現像ロール２ａの背面上部に
位置するマグネツトN3まで搬送され、次いで上
方の現像ロール２ａに設けた各マグネツトS2，
N2，S1，N1及び下方の現像ロール２ｂに設けた
各マグネツトN2，S2，N1，S1，N3に案内されて
感光体１と各現像ロール２ａ，２ｂとの間を下降
する。 The developer 3 scooped up by the paddle 4 is conveyed by the developer conveying magnet roll 5 to the magnet N3 located at the upper part of the back surface of the upper developing roll 2a, and then to the upper developing roller 2a. Each magnet S 2 provided on the roll 2a,
Guided by N 2 , S 1 , N 1 and each magnet N 2 , S 2 , N 1 , S 1 , N 3 provided on the lower developing roll 2b, between the photoreceptor 1 and each developing roll 2a, 2b. descend.
従つて、この実施例によれば、第１図と第３図
とを比較すれば明らかなように、現像剤３につい
て各現像ロール２ａ，２ｂの背面搬送がなくな
り、第２図と第４図とを比較すれば明らかなよう
に、各現像ロール２ａ，２ｂの背面側、すなわ
ち、第４図において上方の現像ロール２ａにおけ
るマグネツトN3とN1との間及び下方の現像ロー
ル２ｂにおけるマグネツトN2とN3との間にマグ
ネツトを配設する必要がなくなり、各現像ロール
２ａ，２ｂに設ける必要のあるマグネツトの数が
減少する。 Therefore, according to this embodiment, as is clear from a comparison between FIG. 1 and FIG. As is clear from the comparison between the magnets N3 and N1 on the back side of each developing roll 2a, 2b, that is, the upper developing roll 2a in FIG. 4, and the magnet N on the lower developing roll 2b. It is no longer necessary to provide a magnet between the developing rolls 2 and N3 , and the number of magnets required for each developing roll 2a, 2b is reduced.
以上の通り、本発明の現像装置によれば、その
現像ロールとこの現像ロールに現像剤を供給する
パドルとの間に現像剤搬送用マグネツトロールを
設けて最上方にセツトされた現像ロールに現像剤
を供給するようにしたので、現像剤について複数
の現像ロールによる背面搬送の必要がなくなり、
それだけ現像剤の搬送性が向上する。また、現像
剤について現像ロールの背面搬送の必要がなくな
つたことから、各現像ロールの背面側にマグネツ
トを配設する必要がなくなり、現像ロールの径を
小さく設計し、感光体の３時又は９時の位置に３
〜５本という多数本の現像ロールを配設すること
が可能になり、現像性能の向上を図ることがで
き、しかも、背面搬送の不要と現像剤の搬送性向
上により、各現像ロールの磁極と磁力の選択や各
現像ロール間隔の選択における困難性が低減され
るので、ウイツズモードの現像における欠点を解
消することができる。
As described above, according to the developing device of the present invention, a magnetic roll for transporting the developer is provided between the developing roll and the paddle that supplies developer to the developing roll, and the developing roll set at the uppermost position is provided with a magnetic roll for transporting the developer. Since the developer is supplied, there is no need for the developer to be transported from the back using multiple development rolls.
The developer transportability is improved accordingly. In addition, since the developer no longer needs to be conveyed on the back side of the developing roll, it is no longer necessary to arrange a magnet on the back side of each developing roll. 3 at 9 o'clock position
It is now possible to arrange a large number of developing rolls (up to 5), improving developing performance.Moreover, by eliminating the need for rear conveyance and improving developer conveyance, the magnetic poles of each developing roll can be Since the difficulty in selecting the magnetic force and the interval between the developing rolls is reduced, the drawbacks in development in the With mode can be overcome.
第１図は従来の現像装置を示す断面説明図、第
２図は第１図の各現像ロールにおけるマグネツト
の配置を示す説明図、第３図及び第４図は本発明
の実施例に係る現像装置を示す第１図及び第２図
と同様の断面説明図及び説明図である。
符号説明、１……感光体、２ａ，２ｂ……現像
ロール、３……現像剤、４……パドル、５……現
像剤搬送用マグネツトロール。
FIG. 1 is a cross-sectional explanatory diagram showing a conventional developing device, FIG. 2 is an explanatory diagram showing the arrangement of magnets in each developing roll in FIG. 1, and FIGS. 3 and 4 are a developing device according to an embodiment of the invention. 1 and 2 showing the apparatus; FIG. Explanation of symbols: 1...Photoreceptor, 2a, 2b...Developing roll, 3...Developer, 4...Paddle, 5...Magnetic roll for conveying developer.
Claims (1)
置が時計の３時又は９時の位置であつて上記複数
の現像ロールがいずれも感光体と同じ方向に回転
し且つ現像剤が感光体とそれら現像ロールとの間
を各現像ロール表面で磁気ブラシを形成しながら
順次下降して現像を行う複写機の現像装置におい
て、上記現像ロールと現像剤をすくい上げて現像
ロールに供給するパドルとの間に現像剤搬送用マ
グネツトロールを設け、このマグネツトロールに
よつてパドルから供給された現像剤を最上方にセ
ツトされた現像ロールに供給することを特徴とす
る複写機の現像装置。1. The set position of the plurality of developing rolls relative to the photoconductor is at the 3 o'clock or 9 o'clock position, and the plurality of development rolls are all rotating in the same direction as the photoconductor, and the developer is mixed with the photoconductor and the development rolls. In a developing device of a copying machine, in which development is carried out by descending sequentially while forming a magnetic brush on the surface of each developing roll, the developer is placed between the developing roll and a paddle that scoops up developer and supplies it to the developing roll. 1. A developing device for a copying machine, characterized in that a conveying magnet roll is provided, and the magnet roll supplies developer supplied from a paddle to a developing roll set at the uppermost position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15712183A JPS6049372A (en) | 1983-08-30 | 1983-08-30 | Developing device of copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15712183A JPS6049372A (en) | 1983-08-30 | 1983-08-30 | Developing device of copying machine |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8245285A Division JP2699968B2 (en) | 1996-09-17 | 1996-09-17 | Copier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6049372A JPS6049372A (en) | 1985-03-18 |
| JPH0513316B2 true JPH0513316B2 (en) | 1993-02-22 |
Family
ID=15642668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15712183A Granted JPS6049372A (en) | 1983-08-30 | 1983-08-30 | Developing device of copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6049372A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825944A (en) * | 1971-08-09 | 1973-04-04 | ||
| JPS5288347A (en) * | 1976-01-20 | 1977-07-23 | Canon Inc | Development means |
| JPS569972A (en) * | 1979-07-05 | 1981-01-31 | Japan Storage Battery Co Ltd | Laminated battery of flat-type nickel cadmium battery and its charge control mechanism |
| JPS5630157A (en) * | 1979-08-21 | 1981-03-26 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS5660469A (en) * | 1979-10-23 | 1981-05-25 | Canon Inc | Developing device |
| JPS56159673A (en) * | 1980-05-13 | 1981-12-09 | Ricoh Co Ltd | Developing device |
| JPS56161568A (en) * | 1980-05-16 | 1981-12-11 | Minolta Camera Co Ltd | Developing device for electrostatic latent image |
| JPS5752065A (en) * | 1980-09-16 | 1982-03-27 | Ricoh Co Ltd | Developing device with magnetic brush |
| JPS5895368A (en) * | 1981-11-30 | 1983-06-06 | Konishiroku Photo Ind Co Ltd | Developing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56164253U (en) * | 1980-05-07 | 1981-12-05 | ||
| JPS56175845U (en) * | 1980-05-26 | 1981-12-25 |
-
1983
- 1983-08-30 JP JP15712183A patent/JPS6049372A/en active Granted
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825944A (en) * | 1971-08-09 | 1973-04-04 | ||
| JPS5288347A (en) * | 1976-01-20 | 1977-07-23 | Canon Inc | Development means |
| JPS569972A (en) * | 1979-07-05 | 1981-01-31 | Japan Storage Battery Co Ltd | Laminated battery of flat-type nickel cadmium battery and its charge control mechanism |
| JPS5630157A (en) * | 1979-08-21 | 1981-03-26 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS5660469A (en) * | 1979-10-23 | 1981-05-25 | Canon Inc | Developing device |
| JPS56159673A (en) * | 1980-05-13 | 1981-12-09 | Ricoh Co Ltd | Developing device |
| JPS56161568A (en) * | 1980-05-16 | 1981-12-11 | Minolta Camera Co Ltd | Developing device for electrostatic latent image |
| JPS5752065A (en) * | 1980-09-16 | 1982-03-27 | Ricoh Co Ltd | Developing device with magnetic brush |
| JPS5895368A (en) * | 1981-11-30 | 1983-06-06 | Konishiroku Photo Ind Co Ltd | Developing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6049372A (en) | 1985-03-18 |
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