JPH0251506B2 - - Google Patents
Info
- Publication number
- JPH0251506B2 JPH0251506B2 JP58197631A JP19763183A JPH0251506B2 JP H0251506 B2 JPH0251506 B2 JP H0251506B2 JP 58197631 A JP58197631 A JP 58197631A JP 19763183 A JP19763183 A JP 19763183A JP H0251506 B2 JPH0251506 B2 JP H0251506B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnetic
- conveying device
- developer
- ring member
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 229920003002 synthetic resin Polymers 0.000 claims 1
- 239000000057 synthetic resin Substances 0.000 claims 1
- 108091008695 photoreceptors Proteins 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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)
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、現像剤搬送装置に係り、特に、画像
担体表面に形成された静電潜像を磁性現像剤を用
いて顕像化するための現像装置や磁気クリーニン
グ装置等に使用する現像剤搬送装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developer conveying device, and in particular to a developing device and a magnetic cleaning device for visualizing an electrostatic latent image formed on the surface of an image carrier using a magnetic developer. The present invention relates to a developer transport device used for applications such as the above.
電子写真複写機，フアクシミリ，プリンターな
どの画像形成装置において、感光体表面に形成さ
れた静電潜像を現像する装置としては、感光体層
をその表面に保持した回転ドラム（以下感光体ド
ラムという）の周囲に永久磁石ロールを配設した
ものが知られている。 In image forming devices such as electrophotographic copiers, facsimiles, and printers, a rotating drum (hereinafter referred to as a photoreceptor drum) that holds a photoreceptor layer on its surface is used as a device for developing an electrostatic latent image formed on the surface of a photoreceptor. ) is known in which a permanent magnet roll is placed around the magnet.
この永久磁石ロールは、非磁性の円筒形スリー
ブ（以下非磁性スリーブという）と、その内部の
表面に複数個の磁極を有する永久磁石部材を有
し、非磁性スリーブと永久磁石部材の相対的回転
により、非磁性スリーブ上に保持された磁性現像
剤を搬送して静電潜像に近接もしくは接触せしめ
るものである。この磁性現像剤としては、鉄粉や
フエライト粉末などの磁性キヤリアとトナーとの
混合粉体である二成分系現像剤や、樹脂と磁性体
を主成分とする一成分系の磁性トナーなどが、一
般に使用されている。 This permanent magnet roll has a non-magnetic cylindrical sleeve (hereinafter referred to as non-magnetic sleeve) and a permanent magnet member having a plurality of magnetic poles on its inner surface, and the relative rotation of the non-magnetic sleeve and the permanent magnet member. This conveys the magnetic developer held on the non-magnetic sleeve to bring it close to or in contact with the electrostatic latent image. Examples of this magnetic developer include a two-component developer, which is a mixed powder of toner and a magnetic carrier such as iron powder or ferrite powder, and a one-component magnetic toner, whose main components are resin and magnetic material. Commonly used.
上記の現像装置においては、感光体表面と永久
磁石ロール表面との間隙（以下現像ギヤツプとい
う）を、常に一定に維持することが現像ムラを防
ぐ上で重要であるが、感光体ドラムの偏心などに
起因して現像ギヤツプを一定に保つことは、実質
的に不可能である。特に、磁性現像剤として磁性
トナーを用いる場合は、非磁性スリーブ上のトナ
ー層の厚さが薄い（通常は1.0〜0.1mm）ことから
現像ギヤツプも狭くなる。したがつて、現像ギヤ
ツプが変動して、例えば狭くなりすぎると、トナ
ーの凝集や潰れが生じてしまうことになる。 In the above developing device, it is important to always maintain a constant gap between the photoreceptor surface and the permanent magnet roll surface (hereinafter referred to as the development gap) in order to prevent uneven development. It is virtually impossible to keep the development gap constant due to this. In particular, when magnetic toner is used as the magnetic developer, the development gap becomes narrower because the toner layer on the nonmagnetic sleeve is thinner (usually 1.0 to 0.1 mm). Therefore, if the development gap fluctuates and becomes too narrow, for example, toner agglomeration or crushing will occur.
そこで、このような不具合を排除するため、例
えば特開昭54―25839号および同55−129367号の
各公報に記載されているように、永久磁石ロール
の両端に感光体ドラムの両端と接触するガイドロ
ーラを、回転自在に装着することが提案されてい
る。そして、この種の従来のガイドローラは、軸
受に樹脂製のリング部材を嵌装して形成されてい
るため、特に、リング部材の肉厚が薄い場合
（0.5〜２mm程度）は、ガイドローラ回転中にリン
グ部材が抜け出てしまうという問題があつた。 Therefore, in order to eliminate such problems, for example, as described in Japanese Patent Application Laid-open Nos. 54-25839 and 55-129367, both ends of the permanent magnet roll are brought into contact with both ends of the photoreceptor drum. It has been proposed that the guide roller be rotatably mounted. Since this type of conventional guide roller is formed by fitting a resin ring member into a bearing, the guide roller rotation is particularly difficult when the ring member is thin (approximately 0.5 to 2 mm). There was a problem with the ring member falling out.
本発明は、このような欠点を除去し、ガイドロ
ーラの作動不良を解消した現像剤搬送装置の提供
を、目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a developer conveying device that eliminates such drawbacks and eliminates the problem of guide roller malfunction.
本発明の構成は、現像剤を保持する搬送ロール
を画像担体ドラムに対向して回転自在に配置する
とともに、前記画像担体ドラムの両端部に当設す
るガイドローラを前記搬送ローラを前記搬送ロー
ルの両端部に回転自在に装着してなる現像剤搬送
装置において、前記ガイドローラを軸受の外周面
にリング部材を嵌装して形成し、かつ、該リング
部材の内周面の両端部に突出部を設けた現像剤搬
送装置にある。 The structure of the present invention is such that a conveyance roll holding developer is rotatably arranged opposite to an image carrier drum, and guide rollers attached to both ends of the image carrier drum are connected to the conveyance roller. In the developer conveying device rotatably attached to both ends, the guide roller is formed by fitting a ring member onto the outer peripheral surface of a bearing, and the ring member has protruding portions at both ends of the inner peripheral surface. The developer transport device is equipped with:
以下、本発明の実施例を、図面に基づいて説明
する。 Embodiments of the present invention will be described below based on the drawings.
ここで、第１図は、一実施例に係る現像剤搬送
装置を使用した現像装置を示す断面図で、第２図
は、第１図中の現像剤搬送装置の断面図、第３図
は、そのガイドローラの断面図、第４図は、第３
図の要部の拡大図である。 Here, FIG. 1 is a cross-sectional view showing a developing device using a developer conveying device according to an embodiment, FIG. 2 is a cross-sectional view of the developer conveying device in FIG. 1, and FIG. , a sectional view of the guide roller, FIG.
It is an enlarged view of the main part of the figure.
図において、１は感光体ドラム、２は永久磁石
ロール、３は非磁性スリーブ、４は永久磁石部
材、５は永久磁石、６は軸、７，７′はフランジ、
８，８′は軸受で、２ないし８，８′で搬送ロール
を構成する。９，９′はガイドローラ、１０，１
０′は軸受、１１，１１′はリング部材、１２は突
起で、２ないし１２で現像剤搬送装置を構成す
る。１３はトナー槽、１４はドクタ部材、１５は
磁性トナーである。 In the figure, 1 is a photosensitive drum, 2 is a permanent magnet roll, 3 is a non-magnetic sleeve, 4 is a permanent magnet member, 5 is a permanent magnet, 6 is a shaft, 7 and 7' are flanges,
8, 8' are bearings, and 2 to 8, 8' constitute a conveyor roll. 9, 9' are guide rollers, 10, 1
0' is a bearing, 11 and 11' are ring members, and 12 is a protrusion, and 2 to 12 constitute a developer conveying device. 13 is a toner tank, 14 is a doctor member, and 15 is a magnetic toner.
第１図および第２図において、感光体層（図示
せず）を有する感光体ドラム１に対向して永久磁
石ロール２が配置されている。永久磁石ロール２
は、非磁性スリーブ３とその内部に、表面に複数
個の磁極を有する永久磁石５を軸６に固着してな
る永久磁石部材４を有しており、軸６は、その両
端において軸受８，８′を介してフランジ７，
７′に回転自在に支持されている。また、フラン
ジ７，７′の両側には非磁性スリーブ３より所定
量だけ大径のガイドローラ９，９′が、フランジ
７ならびに軸６上にそれぞれ回転自在に設けられ
ており、このガイドローラ９，９′の外周面は、
感光体ドラム１の両端部に当接している。なお、
現像ギヤツプｇを一定に維持するために、永久磁
石ロール２もしくは現像装置全体がバネ等の手段
（図示せず）により、感光体ドラム１に向つて付
勢されている。ガイドローラ９は、第３図，第４
図に示すように、軸受１０の外周面にリング部材
１１を嵌装し、該リング部材１１内周面の両端部
に突出部１２を設けたものである。なお、ガイド
ローラ９′の構成も、ガイドローラ９と同様であ
る。 In FIGS. 1 and 2, a permanent magnet roll 2 is placed opposite a photoreceptor drum 1 having a photoreceptor layer (not shown). Permanent magnet roll 2
has a non-magnetic sleeve 3 and a permanent magnet member 4 in which a permanent magnet 5 having a plurality of magnetic poles on the surface is fixed to a shaft 6, and the shaft 6 has bearings 8, 8' via flange 7,
7' is rotatably supported. Further, on both sides of the flanges 7, 7', guide rollers 9, 9' having a diameter larger than the non-magnetic sleeve 3 by a predetermined amount are rotatably provided on the flanges 7 and the shaft 6, respectively. , 9' is the outer peripheral surface of
It is in contact with both ends of the photosensitive drum 1. In addition,
In order to maintain the developing gap g constant, the permanent magnet roll 2 or the entire developing device is urged toward the photosensitive drum 1 by means such as a spring (not shown). The guide roller 9 is shown in FIGS. 3 and 4.
As shown in the figure, a ring member 11 is fitted on the outer peripheral surface of a bearing 10, and protrusions 12 are provided at both ends of the inner peripheral surface of the ring member 11. Note that the configuration of the guide roller 9' is also similar to that of the guide roller 9.
磁性トナー１５を収容するトナー槽１３には、
非磁性スリーブ３上のトナー厚さを規制するため
のドクター部材１４が装着されている。 The toner tank 13 containing the magnetic toner 15 includes:
A doctor member 14 for regulating the thickness of the toner on the non-magnetic sleeve 3 is attached.
上記構成になる現像装置において、永久磁石部
材４と非磁性スリーブ３を相対的に回転させる。
例えば、フランジ７を固定し、軸６を回転させる
と、非磁性スリーブ３上に吸着された磁性トナー
１５は、ドクター部材１４のドクターギヤツプｄ
を通つて図示矢印方向に搬送される。そして磁性
トナーが、現像ギヤツプｇに至ると感光体ドラム
１と接触して静電潜像（図示せず）に付着して現
像が行われる。ここで、ガイドローラ９，９′は、
感光体ドラム１に追従して回転し、現像ギヤツプ
ｇは一定に保たれる。なお、感光体ドラム１に対
するガイドローラ９，９′の押付力は、正確な現
像ギヤツプ確保のためには５〜６Kg・ｆ程度が必
要であり、接触部は高い圧力が生じる。 In the developing device configured as described above, the permanent magnet member 4 and the nonmagnetic sleeve 3 are rotated relative to each other.
For example, when the flange 7 is fixed and the shaft 6 is rotated, the magnetic toner 15 attracted onto the non-magnetic sleeve 3 is transferred to the doctor gap d of the doctor member 14.
is conveyed in the direction of the arrow shown in the figure. When the magnetic toner reaches the development gap g, it comes into contact with the photoreceptor drum 1 and adheres to the electrostatic latent image (not shown), thereby performing development. Here, the guide rollers 9, 9' are
It rotates following the photosensitive drum 1, and the developing gap g is kept constant. The pressing force of the guide rollers 9, 9' against the photosensitive drum 1 needs to be about 5 to 6 kg·f in order to ensure an accurate development gap, and high pressure is generated at the contact portion.
また、ガイドローラ９，９′は、その回転によ
りスラスト方向の力が作用するが、前記したよう
に、リング部材１１，１１′の内面に突起１２が
設けられているので、リング部材１１，１１′が
軸受け１０，１０′より抜けるのを完全に防止す
ることができる。この場合、突起１２の半径Ｒ
は、軸受１０，１０′の半径と同じか、もしくは、
幾分大きくても有効に抜けを防止できる。ただ
し、半径Ｒが大きすぎると、リング部材１１，１
１′を成形するときに金型からの取り外しが困難
となるので、肉厚の１／２以下とすることが好ま
しい。具体的なＲの値としては、軸受１０，１
０′の寸法やリング部材１１，１１′の寸法によつ
ても異なるが、軸受の外径が15〜20mmφ、かつ、
リング部材の肉厚が１〜２mmの場合で0.2〜0.5mm
位が適当である。 Further, a force in the thrust direction is applied to the guide rollers 9, 9' due to their rotation, but as described above, since the projections 12 are provided on the inner surfaces of the ring members 11, 11', the ring members 11, 11'' can be completely prevented from coming off from the bearings 10, 10'. In this case, the radius R of the protrusion 12
is the same as the radius of bearings 10, 10', or
Even if it is somewhat large, it can effectively prevent it from coming off. However, if the radius R is too large, the ring members 11, 1
Since it becomes difficult to remove from the mold when molding 1', it is preferable that the thickness be 1/2 or less of the wall thickness. As a specific value of R, bearing 10,1
0' and the dimensions of the ring members 11 and 11', but the outer diameter of the bearing is 15 to 20 mmφ, and
0.2 to 0.5 mm when the wall thickness of the ring member is 1 to 2 mm.
The position is appropriate.
以上説明したように、本実施例に係る現像剤搬
送装置を使用した現像装置は、非磁性スリーブ３
の内部に永久磁石部材４を設けてなる永久磁石ロ
ール２を、感光体ドラム１に対向して回転自在に
配置するとともに、前記感光体ドラム１の両端部
に当接するガイドローラ９，９′を前記永久磁石
ロール２の両端部に回転自在に装着したことによ
り、感光体ドラム１と非磁性スリーブ３との間の
現像ギヤツプが一定に保たれる。そしてガイドロ
ーラ９，９′の構成を、軸受１０，１０′の外周面
にリング部材１１，１１′を嵌装して形成し、該
リング部材１１，１１′の内周面の両端部に突出
部１２を設けたので、ガイドローラ９，９′の回
転中に、リング部材１１，１１′が抜け出てしま
うことが防止される。 As explained above, the developing device using the developer conveying device according to this embodiment has the non-magnetic sleeve 3
A permanent magnet roll 2 having a permanent magnet member 4 provided therein is rotatably arranged opposite to the photoreceptor drum 1, and guide rollers 9, 9' abutting both ends of the photoreceptor drum 1 are provided. Since the permanent magnet roll 2 is rotatably attached to both ends thereof, the developing gap between the photosensitive drum 1 and the non-magnetic sleeve 3 is kept constant. The guide rollers 9, 9' are formed by fitting ring members 11, 11' onto the outer peripheral surfaces of the bearings 10, 10', and projecting from both ends of the inner peripheral surfaces of the ring members 11, 11'. Since the portion 12 is provided, the ring members 11, 11' are prevented from slipping out during the rotation of the guide rollers 9, 9'.
なお、上記の実施例では現像装置について説明
したが、本発明はこれに限らず、磁気クリーナ用
マグネツトロール（例えば特開昭54−126054号，
同55−64274号の各公報参照）や、クリーニング
用フアーブラシロール（例えば特開昭54−116237
号，特開昭55−70865号の各公報参照）や、現像
用フアーブラシロール（例えば特公昭54−2105号
公報に記載のようなマグネツトロールの表面にフ
アーブラシを固定したものでもよい）等の種々の
用途に適用できることはもちろんである。 Although the above embodiment describes a developing device, the present invention is not limited to this, and the present invention is not limited to this.
55-64274) and cleaning fur brush rolls (for example, Japanese Patent Laid-Open No. 54-116237).
No. 55-70865), developing fur brush rolls (for example, a fur brush fixed to the surface of a magnet roll as described in Japanese Patent Publication No. 54-2105), etc. Of course, it can be applied to various uses.
以上述べたように、本発明は、総合して、ガイ
ドローラの回転中に、リング部材が抜け出てしま
うことがなく、ガイドローラの作動不良を解消し
た現像剤搬送装置を所期できるもので、実用的効
果に優れた発明ということができる。 As described above, the present invention can provide a developer conveying device in which the ring member does not come off during the rotation of the guide roller and eliminates the malfunction of the guide roller. This invention can be said to have excellent practical effects.
第１図は、本発明の一実施例に係る現像剤搬送
装置を使用した現像装置の断面図、第２図は、第
１図中の現像剤搬送装置の断面図、第３図は、そ
のガイドローラの断面図、第４図は、第３図の要
部の拡大図である。
１…感光体ドラム、２…永久磁石ロール、３…
非磁性スリーブ、４…永久磁石部材、９，９′…
ガイドローラ、１０，１０′…軸受、１１，１
１′…リング部材、１２…突出部。
FIG. 1 is a cross-sectional view of a developing device using a developer conveying device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the developer conveying device in FIG. 1, and FIG. The sectional view of the guide roller, FIG. 4, is an enlarged view of the main part of FIG. 3. 1... Photosensitive drum, 2... Permanent magnet roll, 3...
Non-magnetic sleeve, 4...Permanent magnet member, 9, 9'...
Guide roller, 10, 10'...Bearing, 11, 1
1'...Ring member, 12...Protrusion part.
Claims (1)
ムに対向して回転自在に配置するとともに、前記
画像担体ドラムの両端部に当接するガイドローラ
を前記搬送ロールの両端部に回転自在に装着して
なる現像剤搬送装置において、前記ガイドローラ
を軸受の外周面にリング部材を嵌装して形成し、
かつ、該リング部材の内周面の両端部に突出部を
設けたことを特徴とする現像剤搬送装置。 ２ 前記リング部材は合成樹脂製であることを特
徴とする特許請求の範囲第１項記載の現像剤搬送
装置。[Scope of Claims] 1. A conveyance roll that holds developer is rotatably arranged opposite to an image carrier drum, and guide rollers that come into contact with both ends of the image carrier drum are rotated at both ends of the conveyance roll. In the developer conveying device that can be freely attached, the guide roller is formed by fitting a ring member to the outer peripheral surface of a bearing,
A developer conveying device characterized in that a protruding portion is provided at both ends of the inner circumferential surface of the ring member. 2. The developer conveying device according to claim 1, wherein the ring member is made of synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58197631A JPS6090368A (en) | 1983-10-24 | 1983-10-24 | Developer carrying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58197631A JPS6090368A (en) | 1983-10-24 | 1983-10-24 | Developer carrying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6090368A JPS6090368A (en) | 1985-05-21 |
| JPH0251506B2 true JPH0251506B2 (en) | 1990-11-07 |
Family
ID=16377691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58197631A Granted JPS6090368A (en) | 1983-10-24 | 1983-10-24 | Developer carrying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6090368A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03116805U (en) * | 1990-03-12 | 1991-12-03 |
-
1983
- 1983-10-24 JP JP58197631A patent/JPS6090368A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03116805U (en) * | 1990-03-12 | 1991-12-03 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6090368A (en) | 1985-05-21 |
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