JPS63271281A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS63271281A JPS63271281A JP10604787A JP10604787A JPS63271281A JP S63271281 A JPS63271281 A JP S63271281A JP 10604787 A JP10604787 A JP 10604787A JP 10604787 A JP10604787 A JP 10604787A JP S63271281 A JPS63271281 A JP S63271281A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive drum
- developing
- drum
- roller
- developing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
本発明は電子写真方式の画像形成装置において、感光ド
ラムと所定間隙をもって対向配置した現像器における現
像マグローラの長手方向の両側に、前記感光ドラムと当
接して現像マグローラとの間の所定間隙を一定に規定す
るガイドローラを設け、該現像器の支持台は感光ドラム
側の前部が支持軸により支持され、その軸を中心にして
前後及び回転方向に可動的に設置され、かつ前記支持台
を感光ドラム側に付勢する弾性部材と支持台の後部を吊
り上げる弾性部材とを備えてなり、該支持台後部に設け
たカムレバーの回転動作により、前記感光ドラムに対し
て現像器の現像マグローラをガイドローラを介して容易
に当接、若しくは離間し得るようにしたものである。DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention provides an electrophotographic image forming apparatus in which a developing mag roller in a developing device is disposed facing the photosensitive drum with a predetermined gap, and is in contact with the photosensitive drum on both sides in the longitudinal direction. A guide roller is provided to maintain a predetermined gap between the developer mag roller and the developer mag roller. and an elastic member that biases the support base toward the photosensitive drum and an elastic member that lifts up the rear part of the support base. In contrast, the developing mag roller of the developing device can be easily brought into contact with or separated from the developing device via a guide roller.
本発明は電子写真方式の画像形成装置の改良に係り、特
に該画像形成装置における感光ドラムと現像部の現像マ
グローラ（現像マグネットローラ）との間隙を簡便に一
定に保持する構成に関するものである。The present invention relates to an improvement in an electrophotographic image forming apparatus, and particularly to a structure for simply maintaining a constant gap between a photosensitive drum and a developing magnet roller in a developing section in the image forming apparatus.
電子写真方式の画像形成装置は、帯電器によって一様に
帯電され、かつ回転する感光ドラムの表面に、画像情報
に応じたレーザ光等で露光して静電潜像を形成した後、
その静電潜像は現像器において鉄粉と樹脂との混合粉末
からなる電荷を持つトナーと呼ばれる現像剤を静電気力
により付着させ可視像化する。引続き該可視像を転写部
で記録用紙上に転写し、更に定着部で熱や圧着等により
定着されて該記録用紙上に所望の画像を形成している。An electrophotographic image forming apparatus forms an electrostatic latent image on the surface of a rotating photosensitive drum that is uniformly charged by a charger and exposed to laser light or the like according to image information.
The electrostatic latent image is visualized in a developing device by attaching a charged developer called toner, which is made of a mixed powder of iron powder and resin, by electrostatic force. Subsequently, the visible image is transferred onto a recording sheet at a transfer section, and further fixed by heat, pressure, etc. at a fixing section to form a desired image on the recording sheet.
このような画像形成装置では、印字品質に大きな影響を
及ぼす感光ドラム面と現像器の現像マグローラとの間隙
を常に所定の間隔に保持することが要求される。このた
め、これら′を構成する部品の製作精度の如何に係わら
ず、Ｍ単、かつ確実に前記感光ドラム面と現像器の現像
マグローラとの間隙が常に一定に保持され、更にこのよ
うな構成条件下で現像器の着脱が容易な装置構成が必要
とされている。In such an image forming apparatus, it is required to always maintain a predetermined gap between the photosensitive drum surface and the developing mag roller of the developing device, which has a great influence on print quality. Therefore, regardless of the manufacturing precision of the parts constituting these parts, the gap between the photosensitive drum surface and the developing mag roller of the developing device is always maintained constant, and furthermore, such structural conditions There is a need for an apparatus configuration that allows easy attachment and detachment of the developing device at the bottom.
電子写真方式の画像形成装置における従来の感光ドラム
と現像器との配置構成は第４図に示すように、感光ドラ
ム１１に対して現像マグローラ１３が最適な磁気ブラシ
現像がなされる所定の間隙ｔをもって対向するように現
像器１２が支持台１４に固定配置されている。As shown in FIG. 4, the conventional arrangement of a photosensitive drum and a developing device in an electrophotographic image forming apparatus is such that the developing mag roller 13 is positioned at a predetermined gap t with respect to the photosensitive drum 11 for optimal magnetic brush development. A developing device 12 is fixedly arranged on a support base 14 so as to face each other with their sides.
ところでこのような従来の感光ドラム１１と現像器１２
との配置構成にあっては、該感光ドラム１１に対して現
像器１２の設置方法が固定式であるため、例えば感光ド
ラム１１の真円度や円筒度などの微小な誤差が、直接的
に前記感光ドラム１１と現像マグローラ１３間の間隙の
誤差となり、これに起因して該感光ドラム１１に形成さ
れた静電潜像を正常に現像することが困難となり、結果
的に印字品質に悪影響を及ぼすといった問題があった。By the way, such a conventional photosensitive drum 11 and developing device 12
In this arrangement, since the developing device 12 is installed in a fixed manner with respect to the photosensitive drum 11, minute errors such as the roundness and cylindricity of the photosensitive drum 11 are directly affected. This causes an error in the gap between the photosensitive drum 11 and the developing mag roller 13, which makes it difficult to properly develop the electrostatic latent image formed on the photosensitive drum 11, and as a result, print quality is adversely affected. There were problems such as
また現像器１２の保守時の作業も煩雑で容易でないとい
う欠点があった。Further, there is a drawback that maintenance work for the developing device 12 is complicated and not easy.
本発明は上記した従来の問題点に鑑み、感光ドラムに対
する現像器の設置構成として、該感光ドラムの真円度や
円筒度の誤差等に追随するように自由度を持たせて、感
光ドラムと現像マグローラ間の所定間隙ｔを常に一定と
なるように保持すると共に、現像器の保守作業も容易に
した新規な電子写真式の画像形成装置を提供することを
目的とするものである。In view of the above-mentioned conventional problems, the present invention provides a configuration in which a developing device is installed with respect to a photosensitive drum so as to have a degree of freedom so as to follow errors in roundness and cylindricity of the photosensitive drum. It is an object of the present invention to provide a new electrophotographic image forming apparatus in which a predetermined gap t between developing mag rollers is always maintained constant, and maintenance work for a developing device is facilitated.
Ｃ問題点を解決するための手段〕
本発明は上記目的を達成するため、電子写真方式の画像
形成装置での感光ドラムに対して、対向配置されている
現像器における該現像マグローラの長手方向の両側に、
前記感光ドラムと現像マグローラ間の間隙を一定に規定
する間隔保持用のガイドローラを設けている。Means for Solving Problem C] In order to achieve the above-mentioned object, the present invention aims to improve the longitudinal direction of the developing mag roller in the developing device which is disposed opposite to the photosensitive drum in an electrophotographic image forming apparatus. on both sides,
A guide roller for maintaining a constant gap between the photosensitive drum and the developing mag roller is provided.
また現像器の支持台は感光ドラム側の前部が支持軸によ
り支持され、その軸を中心にして前後及び回転方向に可
動的に設置され、かつ前記支持台を感光ドラム側に付勢
する弾性部材と支持台の後部を吊り上げる弾性部材とを
備え、更に該支持台後部には前記感光ドラムに対して現
像器の現像マグローラをガイドローラを介して容易に当
接、または離間するカムレバーを設けた構成とする。The support stand of the developing unit has a front part on the side of the photosensitive drum supported by a support shaft, and is movable in the front and back and rotational directions around the axis, and has an elastic force that urges the support stand toward the photosensitive drum side. and an elastic member for lifting a rear part of the support base, and further provided with a cam lever at the rear of the support base for easily bringing a developing mag roller of a developing device into contact with or separating from the photosensitive drum via a guide roller. composition.
本発明の電子写真方式の画像形成装置では、現像器の支
持台は支持軸と２つの弾性部材により現像マグローラを
感光ドラムに対して常に水平方向に付勢する姿勢となる
。In the electrophotographic image forming apparatus of the present invention, the supporting stand of the developing device is in a position that always urges the developing mag roller in the horizontal direction with respect to the photosensitive drum by means of the supporting shaft and two elastic members.
従って、現像器の現像マグローラは前記ガイドローラを
介して感光ドラムに押し当てられ、回転する感光ドラム
表面に追随されることから、該感光ドラムと現像マグロ
ーラ間の所定間隙が、感光ドラムの真円度や円筒度の精
度の影舌を受けることなく常に一定に保持される。Therefore, the developing mag roller of the developing unit is pressed against the photosensitive drum via the guide roller and follows the surface of the rotating photosensitive drum, so that the predetermined gap between the photosensitive drum and the developing mag roller is the perfect circle of the photosensitive drum. The degree and cylindricity are always kept constant without being influenced by accuracy.
また、前記現像器の保守に際しては、カムレバーを回転
することにより支持台の後部が前記支持軸を支点にして
押し下げられ、現像器が対向する感光ドラムより大きく
離間されるので、現像器の着脱作業等が極めて容易とな
る。Furthermore, when maintaining the developing device, rotating the cam lever pushes down the rear part of the support base using the support shaft as a fulcrum, and the developing device is separated from the opposing photosensitive drum by a large distance, so that the developing device can be attached and removed. etc. becomes extremely easy.
以下図面を用いて本発明の実施例について詳細に説明す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係る電子写真方式の画像形成装置にお
ける感光ドラムと現像器との配置構成の一実施例を示す
要部概略側面図である。FIG. 1 is a schematic side view of essential parts showing an embodiment of the arrangement of a photosensitive drum and a developing device in an electrophotographic image forming apparatus according to the present invention.
図において、１１は感光ドラム、２１は支持台２４上に
設けたガイド枠２５により着脱可能に設置された現像器
であり、該現像器２１における現像マグローラ２２の長
手方向の両側には、第２図の部分平面図に示すように前
記感光ドラム１１（！：該現像マグローラ２２間の所定
間隙【を一定に規定する間隔保持用ガイドローラ２３が
設けられている。In the figure, 11 is a photosensitive drum, 21 is a developing device that is removably installed by a guide frame 25 provided on a support base 24, and on both sides of the developing mag roller 22 in the longitudinal direction of the developing device 21, second As shown in the partial plan view of the figure, a gap-maintaining guide roller 23 is provided to keep a predetermined gap between the photosensitive drums 11 (!: developing mag rollers 22) constant.
また上記のように現像器２１が設置された支持台２４は
、その前部に設けられた長大（２６）に図示しない装置
本体側からの支持軸２７が挿通され、該支持台２４の両
側から該支持軸２７に張架された引っ張りバネ２８ａ
（２８ｂ）により感光ドラム１１に対して平行となるよ
うに前後、左右方向に可動的に支持されると共に、その
後部が該支持軸２７を中心にして回転可能に、図示しな
い装置本体側の係止部３０より吊り下げられた弾性部材
２９により吊り上げられた形に支持されている。Further, the support stand 24 on which the developing device 21 is installed as described above has a support shaft 27 (not shown) from the main body of the apparatus inserted through the long shaft (26) provided at the front part of the support stand 24. A tension spring 28a stretched around the support shaft 27
(28b), it is movably supported in the front-rear, left-right directions so as to be parallel to the photosensitive drum 11, and its rear part is rotatable about the support shaft 27, which is connected to the apparatus main body (not shown). It is supported in a suspended form by an elastic member 29 suspended from the stop portion 30.
更に該支持台２４の後部には前記支持軸２７を支点にし
、弾性部材２９の付勢に逆らって該後部を押し下げるカ
ムレバー３１が設けられている。Furthermore, a cam lever 31 is provided at the rear of the support base 24, using the support shaft 27 as a fulcrum and pushing down the rear part against the bias of the elastic member 29.
そして現像器２１の現像マグローラ２２は、支持台２４
の後部が弾性部材２９により吊り上げられて付勢となる
自由度を持つ構成によって、前記ガイドローラ２３を介
して感光ドラム１１側へ常に当接した形に配設されてい
る。The developing mag roller 22 of the developing device 21 is mounted on a support stand 24.
The rear portion of the photosensitive drum 11 is lifted up by an elastic member 29 and has a degree of freedom to be biased, so that the photosensitive drum 11 is always in contact with the photosensitive drum 11 via the guide roller 23 .
この際、前記支持台２４はその両側から長大２６に挿通
された前記支持軸２７にそれぞれ掛合わされた引張りバ
ネ２８ａ （２８ｂ）により、感光ドラム１１に対して
水平方向に付勢となる自由度を有しているので、感光ド
ラム１１側へ押し出されて前記現像器２１における現像
マグローラ２２の両側の間隔保持用ガイドローラ２３が
対向する感光ドラム１１面に当接され、回転する感光ド
ラム１１の表面に追随動作するため、該感光ドラム１１
と現像マグローラ２２との所定間隙ｔは常に一定に保持
される。At this time, the support stand 24 has a degree of freedom to bias the photosensitive drum 11 in the horizontal direction by means of tension springs 28a (28b) which are respectively engaged with the support shafts 27 inserted through the long shafts 26 from both sides thereof. Since the surface of the photosensitive drum 11 is pushed out toward the photosensitive drum 11 and the spacing guide rollers 23 on both sides of the developing mag roller 22 in the developing device 21 come into contact with the opposing surface of the photosensitive drum 11, the surface of the rotating photosensitive drum 11 is The photosensitive drum 11
The predetermined gap t between the developing roller 22 and the developing mag roller 22 is always kept constant.
従って、感光ドラム１１に形成された静電潜像を正常、
かつ安定に現像することが可能となる。Therefore, the electrostatic latent image formed on the photosensitive drum 11 can be maintained normally.
Moreover, stable development is possible.
一方、このような装置構成において、前記支持台２４よ
り現像器２１を取外したり、取換える際には、第３図に
示すように支持台２４の後部に設けたカムレバー３１を
、例えば９０度程度回転させることにより、該支持台２
４の後部が前記支持軸２７を支点にして弾性部材２９の
付勢に逆らって簡単に押し下げられ、感光ドラム１１よ
り現像器２１の現像マグローラ２２が大きく離間される
ので、記支持台２４のガイド枠２５より現像器２１を極
めて容易に着脱することが可能となる。On the other hand, in such an apparatus configuration, when removing or replacing the developing unit 21 from the support stand 24, the cam lever 31 provided at the rear of the support stand 24 should be rotated, for example, at about 90 degrees, as shown in FIG. By rotating the support base 2
4 is easily pushed down against the bias of the elastic member 29 using the support shaft 27 as a fulcrum, and the developing mag roller 22 of the developing unit 21 is separated from the photosensitive drum 11 by a large distance. The developing device 21 can be attached and detached from the frame 25 very easily.
以上の説明から明らかなように、本発明に係る電子写真
方式の画像形成装置によれば、感光ドラムと現像器の現
像マグローラとの間隙を、感光ドラム等の作製精度、或
いは取付は精度の如何に関わらず常に一定に保持するこ
とが可能となり、印字品質の良い画像を安定して得るこ
とができる優れた効果を奏する。As is clear from the above description, according to the electrophotographic image forming apparatus according to the present invention, the gap between the photosensitive drum and the developing mag roller of the developing device is determined depending on the manufacturing accuracy of the photosensitive drum, etc., or the mounting accuracy. It is possible to always maintain a constant value regardless of the print quality, and this has the excellent effect of stably obtaining images with good print quality.
従って、現像条件により感光ドラムと現像マグローラと
の間隙として、該感光ドラムの機械工作上の精度以上の
間隙精度が要求された場合の装置構成に適用して極めて
有利である。Therefore, it is extremely advantageous to apply the present invention to an apparatus configuration in which the gap between the photosensitive drum and the developing mag roller is required to have a gap accuracy higher than the machining accuracy of the photosensitive drum depending on the developing conditions.
更に現像器はカムレバーの回転動作により簡単に感光ド
ラムより離間でき、また容易に着脱することができるな
ど、実用上の効果は極めて大きい。Furthermore, the developing device can be easily separated from the photosensitive drum by rotating the cam lever, and can be easily attached and detached, which has extremely great practical effects.
第１図は本発明に係る電子写真方式の画像形成装置にお
ける感光ドラムと現像器との
配置構成の一実施例を示す要部概略側
面図、
第２図は本発明に係る感光ドラムと現像マグローラ及び
間隙保持用ガイドローラとの
関係を示す部分平面図、
第３図は本発明に係る電子写真方式の画像形成装置にお
ける感光ドラムに対する現像
器の離間動作を説明するための要部概
略側面図、
第４図は従来の電子写真方式の画像形成装置を説明する
ための要部概略側面図である。
第１図乃至第３図において、
１１は感光ドラム、２１は現像器、２２は現像マグロー
ラ、２３はガイドローラ、２４は支持台、２５はガイド
枠、２６は長穴、２７は支持軸、２８ａ、 ２８ｂは引
張りバネ、２９は弾性部材、３０は係止部、３１はカム
レバーをそれぞれ示す
第１図
第２図FIG. 1 is a schematic side view of essential parts showing an example of the arrangement of a photosensitive drum and a developing device in an electrophotographic image forming apparatus according to the present invention, and FIG. 2 is a schematic side view of the main parts of the photosensitive drum and developing mag roller according to the present invention FIG. 3 is a schematic side view of essential parts for explaining the separation operation of the developing device from the photosensitive drum in the electrophotographic image forming apparatus according to the present invention; FIG. 4 is a schematic side view of main parts for explaining a conventional electrophotographic image forming apparatus. 1 to 3, 11 is a photosensitive drum, 21 is a developing device, 22 is a developing mag roller, 23 is a guide roller, 24 is a support stand, 25 is a guide frame, 26 is an elongated hole, 27 is a support shaft, and 28a , 28b is a tension spring, 29 is an elastic member, 30 is a locking portion, and 31 is a cam lever.
Claims (1)
ローラ（２２）が対向するように現像器（２１）を配置
してなる画像形成装置であって、 上記現像器（２１）における現像マグローラ（２２）の
長手方向の両側に、前記感光ドラム（１１）と当接して
現像マグローラ（２２）との間隙を一定に規定するガイ
ドローラ（２３）を設け、該現像器（２１）の支持台（
２４）は感光ドラム（１１）側の前部が支持軸（２７）
により支持され、その軸を中心にして前後及び回転方向
に可動的に設置され、かつ前記支持台（２４）を感光ド
ラム（１１）側に付勢する弾性部材（２８ａ、２８ｂ）
と同支持台（２４）の後部を吊り上げる弾性部材（２９
）とを備えてなり、該支持台（２４）後部に設けたカム
レバー（３１）の回転動作により、前記感光ドラム（１
１）に対して現像器（２１）の現像マグローラ（２２）
をガイドローラ（２３）を介して当接、若しくは離間す
るようにしたことを特徴とする画像形成装置。[Scope of Claims] An image forming apparatus comprising a developing device (21) arranged such that a developing mag roller (22) faces a photosensitive drum (11) with a predetermined gap, the developing device (21) Guide rollers (23) that come into contact with the photosensitive drum (11) and define a constant gap between the developing mag roller (22) and the developing mag roller (22) are provided on both sides of the developing mag roller (22) in the longitudinal direction of the developing device (21). support stand (
24), the front part on the photosensitive drum (11) side is the support shaft (27)
elastic members (28a, 28b) supported by the support base, movably installed in the front and rear and rotational directions around the axis thereof, and biasing the support base (24) toward the photosensitive drum (11);
and an elastic member (29) that lifts the rear part of the support stand (24).
), and the photosensitive drum (1
For 1), the developing mag roller (22) of the developing device (21)
An image forming apparatus characterized in that the rollers are brought into contact with each other or separated from each other via a guide roller (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10604787A JPS63271281A (en) | 1987-04-28 | 1987-04-28 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10604787A JPS63271281A (en) | 1987-04-28 | 1987-04-28 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63271281A true JPS63271281A (en) | 1988-11-09 |
Family
ID=14423718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10604787A Pending JPS63271281A (en) | 1987-04-28 | 1987-04-28 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63271281A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100584617B1 (en) | 2005-01-20 | 2006-05-30 | 삼성전자주식회사 | Developing cartridge and electrophotographic image forming apparatus using the same |
-
1987
- 1987-04-28 JP JP10604787A patent/JPS63271281A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100584617B1 (en) | 2005-01-20 | 2006-05-30 | 삼성전자주식회사 | Developing cartridge and electrophotographic image forming apparatus using the same |
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