JP2754585B2 - Developing device - Google Patents

Developing device

Info

Publication number
JP2754585B2
JP2754585B2 JP63207741A JP20774188A JP2754585B2 JP 2754585 B2 JP2754585 B2 JP 2754585B2 JP 63207741 A JP63207741 A JP 63207741A JP 20774188 A JP20774188 A JP 20774188A JP 2754585 B2 JP2754585 B2 JP 2754585B2
Authority
JP
Japan
Prior art keywords
toner
conveying member
toner conveying
driving roller
belt guide
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
Application number
JP63207741A
Other languages
Japanese (ja)
Other versions
JPH0256573A (en
Inventor
裕次 江ノ口
秀一 中川
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP63207741A priority Critical patent/JP2754585B2/en
Publication of JPH0256573A publication Critical patent/JPH0256573A/en
Application granted granted Critical
Publication of JP2754585B2 publication Critical patent/JP2754585B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、電子写真装置等に使用される現像装置に
係り、特に、現像剤として一成分系現像剤を使用し、駆
動ローラの外周を覆うようにして設けられたトナー搬送
部材を、感光体ドラム等の像担持体の表面に接触させ
て、このトナー搬送部材からトナーを像担持体に付与す
る現像装置に感するものである。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used for an electrophotographic apparatus or the like, and more particularly to a developing device using a one-component developer as a developer, The toner conveying member provided so as to cover is brought into contact with the surface of an image carrier such as a photoreceptor drum, and the developer is felt by a developing device which applies toner from the toner conveying member to the image carrier.

[従来技術及びその問題点] 従来、一成分系現像剤を使用した現像装置において
は、特開昭52−143831号公報等に示されているように、
トナーを搬送する弾性ローラの表面に非磁性トナーを供
給し、このトナーをブレード等のトナー規制部材によっ
て弾性ローラの表面に圧接させ、トナー帯電させると共
に、弾性ローラ表面におけるトナー層の厚みを規制する
ようになっている。
[Prior art and its problems] Conventionally, in a developing apparatus using a one-component type developer, as disclosed in JP-A-52-144381, etc.
A non-magnetic toner is supplied to the surface of the elastic roller that conveys the toner, and this toner is pressed against the surface of the elastic roller by a toner regulating member such as a blade to charge the toner and regulate the thickness of the toner layer on the elastic roller surface. It has become.

そして、このように所要厚みのトナー層が形成された
弾性ローラの表面を、感光体ドラム等の像担持体の表面
に接触させ、トナーを像担持体の表面に形成された潜像
箇所に付与するようになっている。
Then, the surface of the elastic roller on which the toner layer having the required thickness is formed is brought into contact with the surface of an image carrier such as a photoreceptor drum to apply toner to a latent image formed on the surface of the image carrier. It is supposed to.

ここで、このような現像装置においては、弾性ローラ
の表面にブレード等のトナー規制部材を圧接させてトナ
ーを帯電させるため、弾性ローラの表面には比較的高い
硬度が要求される一方、この弾性ローラの表面を像担持
体の表面に接触させてトナーを供給するために、弾性ロ
ーラの表面をその軸方向全体に亙って像担持体の表面に
柔らかく接触させることが必要とされる。
Here, in such a developing device, since a toner regulating member such as a blade is pressed against the surface of the elastic roller to charge the toner, the surface of the elastic roller is required to have relatively high hardness. In order to supply toner by bringing the surface of the roller into contact with the surface of the image carrier, it is necessary to make the surface of the elastic roller softly contact the surface of the image carrier over the entire axial direction.

しかし、上記のように硬度が比較的高い弾性ローラの
表面を、その軸方向全体に亙って像担持体の表面に柔ら
かく接触させることは非常に困難であり、像担持体が損
傷したり、画質が低下する等の問題があった。
However, it is very difficult to make the surface of the elastic roller having a relatively high hardness softly contact the surface of the image carrier over the entire axial direction as described above. There are problems such as a decrease in image quality.

このような問題を解決するため、本出願人は先の出願
において、第8図に示すような現像装置(11)を開示し
た。
In order to solve such a problem, the present applicant has disclosed a developing device ( 11 ) as shown in FIG. 8 in an earlier application.

この現像装置(11)においては、トナー収容槽(3)
に収容されたトナー(4)を像担持体(2)に搬送する
トナー搬送部材(10)として、駆動ローラ(9)より径
が大きくなったスリーブ状のものを使用し、このトナー
搬送部材(10)によって駆動ローラ(9)の外周を覆う
ようにした。
In the developing device (1 1 ), the toner storage tank (3)
As the toner conveying member (10) for conveying the toner (4) stored in the toner carrier to the image carrier (2), a sleeve-shaped member having a diameter larger than that of the driving roller (9) is used. The outer periphery of the drive roller (9) was covered by (10).

そして、このトナー搬送部材(10)の軸方向両側部
に、上記駆動ローラ(9)の外径とほぼ同径の内径を有
する半円状に形成された剛性のガイド部材(121)を設
け、このガイド部材(121)によって、上記トナー搬送
部材(10)を、像担持体(2)と対面する対面部を除く
部分で駆動ローラ(9)に圧接させる一方、像担持体
(2)と対面する対面部において、トナー搬送部材(1
0)を駆動ローラ(9)より像担持体(2)側に突出さ
せ、この突出されたトナー搬送部材(10)を、像担持体
(2)の表面に柔らかく接触させて、像担持体(2)の
表面にトナー(4)付与するようにした。
A rigid guide member (12 1 ) formed in a semicircular shape having an inner diameter substantially equal to the outer diameter of the driving roller (9) is provided on both axial sides of the toner conveying member (10). By the guide member (12 1 ), the toner conveying member (10) is pressed against the drive roller (9) at a portion other than a portion facing the image carrier (2), while the image carrier (2). In the facing part facing the toner transport member (1
0) is projected from the driving roller (9) toward the image carrier (2), and the projected toner conveying member (10) is brought into soft contact with the surface of the image carrier (2). The toner (4) was applied to the surface of 2).

しかし、このような現像装置(11)においては、駆動
ローラ(6)の外径とほぼ同径の内径を有する半円状に
なった剛性のガイド部材(121)によって、トナー搬送
部材(10)を像担持体(2)と対面する対面部を除く部
分で駆動ローラ(9)に圧接させるため、ガイド部材
(121)の内径と駆動ローラ(6)の外径とを正確に合
わせる必要があり、また偏心ないように、これらの中心
軸等の精度も正確であることが要求され、これらの製造
等が非常に困難であった。
However, in such a developing device (1 1 ), the toner conveying member (12 1 ) is formed by a semicircular rigid guide member (12 1 ) having an inner diameter substantially the same as the outer diameter of the driving roller (6). The inner diameter of the guide member (12 1 ) and the outer diameter of the drive roller (6) are accurately matched because the part (10) is pressed against the drive roller (9) at a portion other than the part facing the image carrier (2). It is also necessary that the precision of the center axis and the like be accurate so that there is no eccentricity, and it is very difficult to manufacture them.

そして、ガイド部材(121)や駆動ローラ(6)等の
製造においてずれが生じた場合には、駆動ローラ(9)
に加わるトルクが大きくなったり、トナー搬送部材(1
0)に必要以上の力が加わり、トナー搬送部材(10)の
耐久性が低下するという問題があった。
If a deviation occurs in the manufacture of the guide member (12 1 ), the drive roller (6), etc., the drive roller (9)
Torque applied to the toner transport member
There is a problem that excessive force is applied to (0) and the durability of the toner conveying member (10) is reduced.

[発明が解決しようとする課題] この発明は、上記のような問題を解決することを課題
としてなされたものである。
[Problems to be Solved by the Invention] The present invention has been made to solve the above problems.

すなわち、この発明は、駆動ローラより径が大きくな
ったトナー搬送部材を、像担持体と対面する対面部を除
く箇所で駆動ローラに圧接すると共に、像担持体と対面
する対面部において、トナー搬送部材を駆動ローラより
像担持体側に突出させ、像担持体の表面にトナー搬送部
材を柔らかく接触させてトナーを付与するようにした現
像装置において、トナー搬送部材を像担持体と対面する
対面部を除く箇所で、駆動ローラに容易かつ確実に圧接
させることができるようになった現像装置を提供するこ
とを目的としたものである。
That is, according to the present invention, the toner conveying member having a diameter larger than that of the driving roller is pressed against the driving roller at a portion other than the facing portion facing the image carrier, and the toner transporting member is transported at the facing portion facing the image bearing member. In a developing device in which the member is protruded from the drive roller toward the image carrier, and the toner conveying member is softly contacted with the surface of the image carrier to apply the toner, the facing portion where the toner conveying member faces the image carrier is removed. It is an object of the present invention to provide a developing device that can easily and surely press against a driving roller at a location other than the developing roller.

[課題を解決するための手段] この発明に係る現像装置においては、上記のような課
題を解決するため、回転駆動する駆動ローラと、この駆
動ローラの周長に対して僅かな余剰周長を有して駆動ロ
ーラに外装され、この駆動ローラとの間に実質的に滑り
のない筒状の薄膜部材で構成されて像担持体と対面する
トナー搬送部材と、このトナー搬送部材の軸方向両端部
であって像担持体と対面する対面部を除く箇所におい
て、このトナー搬送部材の駆動ローラに圧接させると共
に像担持体との対面部でトナー搬送部材を駆動ローラよ
り像担持体側に突出させる可撓性のベルトガイドとを設
けるようにしたのである。
[Means for Solving the Problems] In the developing device according to the present invention, in order to solve the above-described problems, a driving roller that is driven to rotate and a small extra peripheral length with respect to the peripheral length of the driving roller are used. A toner conveying member which is formed of a cylindrical thin film member which is substantially non-slip with the driving roller and which faces the image carrier, and both ends of the toner conveying member in the axial direction. At the portion except for the facing portion facing the image carrier, the toner transporting member can be pressed against the driving roller, and the toner transporting member can project from the driving roller toward the image carrier at the facing portion with the image bearing member. A flexible belt guide is provided.

ここで、上記のような可撓性のベルトガイドとして
は、ポリエステル,ポリエチレン,ポリアセテート,ポ
リイミド等の合成樹脂で構成された膜厚20〜200μm程
度の高分子樹脂フィルムや、この高分子樹脂フィルムを
ベースにして、トナー搬送部材と接触する面にポリ四フ
ッ化エチレン,ポリフッ化ビニリデン等のフッ素樹脂フ
ィルムのように滑りのよいフィルムを張り合わせたもの
等を使用する。
Here, as the flexible belt guide as described above, a polymer resin film made of synthetic resin such as polyester, polyethylene, polyacetate, and polyimide and having a film thickness of about 20 to 200 μm, or this polymer resin film Based on the above, a material such as a fluororesin film such as polytetrafluoroethylene, polyvinylidene fluoride or the like, which is adhered to a surface in contact with the toner conveying member, is used.

[作用] このように構成された現像装置においては、駆動ロー
ラの外周を覆うようにして設けられたトナー搬送部材の
軸方向両側部において、可撓性のベルトガイドを像担持
体と対面する対面部を除いてトナー搬送部材の外周に沿
わせると、このベルトガイドを張るだけで、トナー搬送
部材が像担持体と対面する対面部を除く部分で駆動ロー
ラに圧接されるようになると共に、像担持体と対面する
対面部において、このトナー搬送部材が上記駆動ローラ
より像担持体側に突出されるようになる。
[Operation] In the developing device configured as described above, the flexible belt guide faces the image carrier on both sides in the axial direction of the toner conveying member provided so as to cover the outer periphery of the driving roller. When the belt guide is stretched along the outer periphery of the toner conveying member except for the portion, the toner conveying member comes into pressure contact with the drive roller at a portion other than the facing portion facing the image carrier, and the image is formed. At the facing portion facing the carrier, the toner conveying member projects from the driving roller toward the image carrier.

また、駆動ローラにおける振れや偏心等は、上記可撓
性のベルトガイドのたわみ等によって吸収されるように
なる。
In addition, run-out, eccentricity, and the like of the drive roller are absorbed by bending of the flexible belt guide.

なお、上記可撓性のベルトガイドとして、高分子樹脂
フィルムをベースにし、トナー搬送部材と接触する面に
滑りのよい樹脂フィルムを張ったものを使用すると、ト
ナー搬送部材とこのベルトガイドとの間の滑りがよくな
り、トナー搬送部材の駆動がスムーズに行われるように
なる。
When the flexible belt guide is made of a polymer resin film as a base and has a slippery resin film stretched on a surface that comes into contact with the toner conveying member, a gap between the toner conveying member and the belt guide can be obtained. Is improved, and the toner conveying member is driven smoothly.

[実施例] 以下、この発明の実施例を図面に基づいて具体的に説
明する。
Embodiment An embodiment of the present invention will be specifically described below with reference to the drawings.

先ず、第1図に示す現像装置(1)の例について説明
する。
First, an example of the developing device (1) shown in FIG. 1 will be described.

この現像装置(1)は、同図に示すように、像担持体
(2)である感光体ドラム(2)に近接した位置に設け
られており、この感光体ドラム(2)から離れた後部の
位置に設けられたトナー収容槽(3)内に、一成分系現
像剤であるトナー(4)が収容されている。
As shown in FIG. 1, the developing device (1) is provided at a position close to a photosensitive drum (2) serving as an image carrier (2), and a rear portion away from the photosensitive drum (2). The toner (4), which is a one-component developer, is stored in the toner storage tank (3) provided at the position (1).

ここで、このトナー収容槽(3)は、同図に示すよう
に、その底部に設けられた山部(3a)によって、感光体
ドラム(2)から離れた後方に位置する大きな第一の攪
拌部(5)と、この第一の攪拌部(5)より感光体ドラ
ム(2)側に位置する小さな第二の攪拌部(6)とに区
画されており、これら第一及び第二の攪拌部(5),
(6)には、それぞれトナー(4)を攪拌する第一及び
第二の攪拌部材(7),(8)が設けられている。
Here, as shown in the figure, the toner storage tank (3) has a large first agitator located rearward away from the photosensitive drum (2) by a crest (3a) provided at the bottom thereof. Section (5) and a small second stirring section (6) located closer to the photosensitive drum (2) than the first stirring section (5). Part (5),
(6) is provided with first and second stirring members (7) and (8) for stirring the toner (4), respectively.

そして、第一の攪拌部(5)内に設けられた第一の攪
拌部材(7)を回転させて、トナー(4)を第一の攪拌
部(5)内において攪拌すると共に、第二の攪拌部
(6)に送るようになっている。
Then, the first stirring member (7) provided in the first stirring section (5) is rotated to stir the toner (4) in the first stirring section (5), and to rotate the toner (4) in the second stirring section (5). It is sent to the stirring section (6).

また、このようにして第二の攪拌部(6)に送られて
きたトナー(4)は、第二の攪拌部(6)に設けられた
第二の攪拌部材(8)の回転によって、さらに攪拌され
るようになっている。
The toner (4) thus sent to the second stirring section (6) is further rotated by the rotation of the second stirring member (8) provided in the second stirring section (6). It is designed to be agitated.

そして、このトナー収容槽(3)より感光体ドラム
(2)側の位置には、駆動ローラ(9)によって駆動さ
れるトナー搬送部材(10)が設けられており、上記の第
二の攪拌部(6)において攪拌されたトナー(4)が、
トナー搬送部材(10)の表面に、接触や静電気的な力に
よって供給されるようになっている。
A toner conveying member (10) driven by a driving roller (9) is provided at a position closer to the photosensitive drum (2) than the toner storage tank (3). The toner (4) stirred in (6) is
The toner is supplied to the surface of the toner conveying member (10) by contact or electrostatic force.

ここで、駆動ローラ(9)としては、アルミニウム,
ステンレス等の導電性部材を円筒状に形成したものや、
円筒状に形成された基体の外周面に導電体層や導電性ゴ
ム層を設けたもの等が使用される。
Here, as the driving roller (9), aluminum,
What made a conductive member such as stainless steel into a cylindrical shape,
For example, a substrate in which a conductor layer or a conductive rubber layer is provided on the outer peripheral surface of a cylindrical base is used.

そして、この駆動ローラ(9)は、感光体ドラム
(2)に対面する現像装置(1)の開口部(11)近傍に
おいて、感光体ドラム(2)と対向するようにして回転
可能に取り付けられ、モータ(図示せず)によって上記
感光体ドラム(2)と反対方向に回転するようになって
いる。
The drive roller (9) is rotatably mounted near the photosensitive drum (2) in the vicinity of the opening (11) of the developing device (1) facing the photosensitive drum (2). The photosensitive drum (2) is rotated in the opposite direction by a motor (not shown).

一方、トナー搬送部材(10)は、上記駆動ローラ
(9)の外径より少し長い径を有する筒状に形成されて
おり、このトナー搬送部材(10)が駆動ローラ(9)の
外周を覆うようにして設けられている。
On the other hand, the toner conveying member (10) is formed in a cylindrical shape having a diameter slightly longer than the outer diameter of the driving roller (9), and the toner conveying member (10) covers the outer periphery of the driving roller (9). It is provided in such a manner.

そして、この実施例では、可撓性のベルトガイド(1
2)として、高分子樹脂フィルム(12a)で構成されたも
のを用い、このベルトガイド(12)を、トナー搬送部材
(10)の軸方向両側部において、感光体ドラム(2)と
対面する対面部を除くトナー搬送部材(10)の外周に沿
わせ、このベルトガイド(12)を引っ張った状態で、ベ
ルトガイド(12)の上端部を現像装置(1)の前面部に
取り付けると共に、ベルトガイド(12)の下端部を現像
装置(1)の底部に取り付け、上記トナー搬送部材(1
0)を、感光体ドラム(2)と対面する対面部を除く箇
所で駆動ローラ(9)の外周面に圧接させるようにして
いる。
In this embodiment, the flexible belt guide (1
2) A belt made of a polymer resin film (12a) is used as the belt guide (12). The belt guide (12) faces the photoconductor drum (2) at both axial sides of the toner conveying member (10). The upper end of the belt guide (12) is attached to the front surface of the developing device (1) while the belt guide (12) is pulled along the outer periphery of the toner conveying member (10) except for the belt guide. Attach the lower end of (12) to the bottom of the developing device (1),
0) is pressed against the outer peripheral surface of the drive roller (9) at a location other than the facing portion facing the photosensitive drum (2).

また、このようにトナー搬送部材(10)を、感光体ド
ラム(2)と対面する対面部を除く箇所で駆動ローラ
(9)の外周面に圧接させると、駆動ローラ(9)より
長くなったトナー搬送部材(10)の余長部分が、感光体
ドラム(2)と対面する対面部において、駆動ローラ
(9)より感光体ドラム(2)側に突出し、この突出し
たトナー搬送部材(10)が、感光体ドラム(2)の表面
に接触するようになる。
When the toner conveying member (10) is brought into pressure contact with the outer peripheral surface of the drive roller (9) except for the portion facing the photosensitive drum (2) as described above, the length becomes longer than the drive roller (9). The extra length of the toner conveying member (10) protrudes toward the photoconductive drum (2) from the drive roller (9) at a portion facing the photoconductive drum (2), and the protruding toner conveying member (10). Comes into contact with the surface of the photosensitive drum (2).

そして、この状態で上記駆動ローラ(9)が回転する
と、上記ベルトガイド(12)によって駆動ローラ(9)
に圧接されたトナー搬送部材(10)が、駆動ローラ
(9)との摩擦力により、駆動ローラ(9)の回転に伴
って駆動されるようになる。
When the drive roller (9) rotates in this state, the drive roller (9) is rotated by the belt guide (12).
The toner conveying member (10) pressed against the roller (9) is driven by the rotation of the driving roller (9) due to the frictional force with the driving roller (9).

この場合において、駆動ローラ(9)に振れや偏心等
があっても、上記ベルトガイド(12)がこれを吸収し、
駆動ローラ(9)に加わるトルクが大きくなったり、ト
ナー搬送部材(10)に必要以上の力が加わったりするこ
とがない。
In this case, even if the drive roller (9) has run-out or eccentricity, the belt guide (12) absorbs the run-out or eccentricity,
The torque applied to the drive roller (9) does not increase, and no excessive force is applied to the toner conveying member (10).

そして、このようにトナー搬送部材(10)が駆動さ
れ、トナー搬送部材(10)の表面に供給された前記トナ
ー(4)が、トナー搬送部材(10)が駆動ローラ(9)
に圧接された部分において、ブレード(13)の先端部に
設けられた小径の丸棒(14)によって圧接され、トナー
搬送部材(10)の表面に薄く均一に塗布されると共に、
摩擦帯電されるようになる。
Then, the toner conveying member (10) is driven as described above, and the toner (4) supplied to the surface of the toner conveying member (10) is converted into the driving roller (9) by the toner conveying member (10).
Is pressed by a small-diameter round bar (14) provided at the tip of the blade (13), and is applied to the surface of the toner conveying member (10) thinly and uniformly.
It becomes triboelectrically charged.

その後、このトナー搬送部材(10)が、駆動ローラ
(9)の回転に伴ってさらに駆動されて、感光体ドラム
(2)と対面する対面部に導かれ、駆動ローラ(9)よ
り感光体ドラム(2)側に突出して、感光体ドラム
(2)の表面に充分にかつ柔らかく接触し、トナー
(4)を感光体ドラム(2)の表面に付与するようにな
っている。
Thereafter, the toner conveying member (10) is further driven with the rotation of the driving roller (9), is guided to the facing portion facing the photosensitive drum (2), and is driven by the driving roller (9). The toner (4) protrudes to the side of (2) and sufficiently and softly contacts the surface of the photosensitive drum (2) to apply the toner (4) to the surface of the photosensitive drum (2).

ここで、第2図に示すものにおいては、トナー搬送部
材(10)の表面に供給されたトナー(4)を圧接させる
上記ブレード(13)及び丸棒(14)の側部を切り欠き、
この切り欠き部分の下に上記ベルトガイド(12)を配し
ており、ブレード(13)や丸棒(14)が、このベルトガ
イド(12)に邪魔されることなく、トナー(4)を圧接
できるようになっている。
Here, in FIG. 2, the side of the blade (13) and the round bar (14) for pressing the toner (4) supplied to the surface of the toner conveying member (10) are cut out,
The belt guide (12) is arranged below the notch, and the blade (13) and the round bar (14) press the toner (4) without being hindered by the belt guide (12). I can do it.

また、第3図に示すものにおいては、第2図に示すも
のと同様に、トナー搬送部材(10)の表面に供給された
トナー(4)を圧接させる上記ブレード(13)及び丸棒
(14)の側部を切り欠き、この切り欠き部分の下にベル
トガイド(12)を配すると共に、ブレード(13)や丸棒
(14)よりトナー送り側の位置において、上記ベルトガ
イド(12)に内側に突出したトナー抑制部(12c)を設
けている。
3, the blade (13) and the round bar (14) for pressing the toner (4) supplied to the surface of the toner conveying member (10) into contact with each other are similar to those shown in FIG. ) Is notched, and a belt guide (12) is arranged below this notched portion. At the position on the toner feed side from the blade (13) or the round bar (14), the belt guide (12) is A toner suppressing portion (12c) protruding inward is provided.

そして、このトナー抑制部(12c)により、トナー搬
送部材(10)の両側部に供給されたトナー(4)が、上
記ブレード(13)とベルトガイド(12)との間の隙間を
通って感光体ドラム(2)側にこぼれ出るのを抑制する
ようにしている。
Then, the toner (4) supplied to both sides of the toner conveying member (10) is exposed by the toner suppressing section (12c) through the gap between the blade (13) and the belt guide (12). Spilling to the body drum (2) side is suppressed.

また、第4図に示す実施例のものにおいては、ベルト
ガイド(12)によって、トナー搬送部材(10)を、感光
体ドラム(2)と対面する対面部を除く箇所で駆動ロー
ラ(9)の外周面に圧接するにあたり、ベルトガイド
(12)を感光体ドラム(2)との対面部を除くトナー搬
送部材(10)の外周に沿わせ、このベルトガイド(12)
の下端部を現像装置(1)の底部に取り付けると共に、
このベルトガイド(12)の上端部を、引っ張った状態で
スプリング等の付勢手段(15)を介して現像装置(1)
の前面部に取り付けている。
In the embodiment shown in FIG. 4, the belt guide (12) moves the toner conveying member (10) to the position of the drive roller (9) except for the portion facing the photosensitive drum (2). When the belt guide (12) is pressed against the outer peripheral surface, the belt guide (12) is moved along the outer periphery of the toner conveying member (10) except for the portion facing the photosensitive drum (2).
Is attached to the bottom of the developing device (1),
The developing device (1) is pulled through an urging means (15) such as a spring while the upper end of the belt guide (12) is pulled.
Attached to the front of the

そして、このようにスプリング等の付勢手段(15)に
よって引っ張られたベルトガイド(12)により、トナー
搬送部材(10)を駆動ローラ(9)の外周面に圧接させ
るようにすると、駆動ローラ(9)における振れや偏心
等が、この付勢手段(15)の伸縮によって一層効率よく
吸収され、駆動ローラ(9)に大きなトルクが加わった
り、トナー搬送部材(10)に必要以上の力が加わったり
するのを、より効果的に抑制できるようになる。
When the toner conveying member (10) is pressed against the outer peripheral surface of the driving roller (9) by the belt guide (12) pulled by the urging means (15) such as a spring, the driving roller ( The deflection and eccentricity in 9) are more efficiently absorbed by the expansion and contraction of the biasing means (15), and a large torque is applied to the drive roller (9) and an unnecessary force is applied to the toner conveying member (10). Can be more effectively suppressed.

また、第5図〜第7図に示す実施例においては、トナ
ー搬送部材(10)を感光体ドラム(2)と対面する対面
部を除く箇所で駆動ローラ(9)の外周面に圧接させる
ベルトガイド(12)に、高分子樹脂フィルム(12a)を
ベースにし、その片面にフッ素樹脂フィルムのような滑
りのよいフィルム(12b)を張り合わせたものを使用す
るようにした。
Further, in the embodiment shown in FIGS. 5 to 7, the belt for pressing the toner conveying member (10) against the outer peripheral surface of the driving roller (9) at a portion other than the facing portion facing the photosensitive drum (2). As the guide (12), a polymer resin film (12a) was used as a base, and a slippery film (12b) such as a fluororesin film was adhered to one side of the guide (12).

そして、このベルトガイド(12)の滑りのよいフィル
ム(12b)の方を、トナー搬送部材(10)に接触させる
ようにして、第1図の場合と同様、このベルトガイド
(12)をトナー搬送部材(10)の軸方向両側部におい
て、感光体ドラム(2)と対面する対面部を除くトナー
搬送抜剤(10)の外周に沿わせ、このベルトガイド(1
2)を引っ張り、トナー搬送部材(10)を、感光体ドラ
ム(2)と対面する対面部を除く箇所で駆動ローラ
(9)の外周面に圧接させるようにしている。
Then, the film (12b) of the belt guide (12) having good slippage is brought into contact with the toner conveying member (10), and the belt guide (12) is conveyed by the toner conveying member as in the case of FIG. The belt guide (1) is formed on both sides of the member (10) in the axial direction along the outer periphery of the toner transport and removal agent (10) except for the facing portion facing the photosensitive drum (2).
2), the toner conveying member (10) is brought into pressure contact with the outer peripheral surface of the drive roller (9) except for the portion facing the photosensitive drum (2).

このように、ベルトガイド(12)において、滑りのよ
いフィルム(12b)の方をトナー搬送部材(10)に接触
させて、トナー搬送部材(10)を駆動ローラ(9)の外
周面に圧接させるようにすると、ベルトガイド(12)と
トナー搬送部材(10)との間の滑りがよく、駆動ローラ
(9)の回転に伴うトナー搬送部材(10)の駆動がスム
ーズに行われるようになり、ベルトガイド(12)と駆動
ローラ(9)との間で、トナー搬送部材(10)に加わる
力が少なくなり、トナー搬送部材(10)の耐久性が向上
する。
As described above, in the belt guide (12), the film (12b) having better slippage is brought into contact with the toner conveying member (10), and the toner conveying member (10) is pressed against the outer peripheral surface of the drive roller (9). By doing so, the sliding between the belt guide (12) and the toner conveying member (10) is good, and the driving of the toner conveying member (10) with the rotation of the driving roller (9) is smoothly performed. The force applied to the toner conveying member (10) between the belt guide (12) and the driving roller (9) is reduced, and the durability of the toner conveying member (10) is improved.

また、この実施例のものにおいては、第3図に示した
ものと同様に、トナー搬送部材(10)の表面に供給され
たトナー(4)を圧接させるブレード(13)及び丸棒
(14)の側部を切り欠き、この切り欠き部分の下にベル
トガイド(12)を配すると共に、ブレード(13)や丸棒
(14)よりトナー送り側の位置において、ベルトガイド
(12)に内側に突出したトナー抑制部(12c)を設けて
いる。そして、このトナー制御部(12c)を、第3図に
示したものよりブレード(13)側に長く伸ばし、その端
部(12d)をブレード(13)のトナー送り側の面に取り
付け、トナー搬送部材(10)の両側部に供給されたトナ
ー(4)が、ブレード(13)とベルトガイド(12)との
間の隙間を通って感光体ドラム(2)側にこぼれ出るの
が抑制するようにしている。
In this embodiment, similarly to the embodiment shown in FIG. 3, a blade (13) and a round bar (14) for pressing the toner (4) supplied to the surface of the toner conveying member (10) into pressure contact. The belt guide (12) is arranged below this notch, and the belt guide (12) is inwardly positioned at the toner feed side from the blade (13) and the round bar (14). A protruding toner suppressing section (12c) is provided. Then, the toner control unit (12c) is extended to the blade (13) side longer than that shown in FIG. 3, and its end (12d) is attached to the toner feed side surface of the blade (13), and the toner is conveyed. The toner (4) supplied to both sides of the member (10) is prevented from spilling out to the photosensitive drum (2) through a gap between the blade (13) and the belt guide (12). I have to.

[発明の効果] 以上詳述したように、この発明に係る現像装置におい
ては、駆動ローラの外周を覆うようにして設けられたト
ナー搬送部材の軸方向両側部において、可撓性のベルト
ガイドを、像担持体と対面する対面部を除くトナー搬送
部材の外周に沿わせ、このベルトガイドを張るだけで、
トナー搬送部材を、像担持体と対面する対面部を除く部
分で駆動ローラに圧接させる共に、像担持体との対面部
において、駆動ローラより像担持体側に突出させること
ができるようになった。
[Effects of the Invention] As described above in detail, in the developing device according to the present invention, flexible belt guides are provided at both axial sides of the toner conveying member provided so as to cover the outer periphery of the driving roller. Along the outer periphery of the toner conveying member except for the facing portion facing the image carrier, just stretch this belt guide,
The toner conveying member is brought into pressure contact with the drive roller at a portion other than the portion facing the image carrier, and can be made to protrude from the drive roller toward the image carrier at the portion facing the image carrier.

この結果、従来のように、駆動ローラ及び駆動ローラ
の外径とほぼ同径の内径を有する半円状のガイド部材
を、径や中心等が狂わないように極めて正確に製造した
りする必要はなく、トナー搬送部材を、駆動ローラに容
易かつ確実に圧接させることができるようになった。
As a result, it is not necessary to manufacture a driving roller and a semicircular guide member having an inner diameter substantially the same as the outer diameter of the driving roller very accurately so that the diameter, center, etc., do not change as in the related art. In addition, the toner conveying member can be easily and reliably pressed against the driving roller.

また、駆動ローラにおいて振れや偏心等が生じた場合
においても、トナー搬送部材を駆動ローラに圧接させて
いる上記可撓性のベルトガイドのたわみ等により、駆動
ローラの振れや偏心等が吸収されるようになり、駆動ロ
ーラに大きなトルクが加わったり、トナー搬送部材に必
要以上の力が加わって、トナー搬送部材が損傷したりす
ることがなく、長期に亙り安定して使用できるようにな
った。
Further, even in the case where the drive roller has run-out or eccentricity, the run-out or eccentricity of the drive roller is absorbed by the deflection of the flexible belt guide pressing the toner conveying member against the drive roller. As a result, a large torque is applied to the drive roller and an excessive force is applied to the toner conveying member, so that the toner conveying member is not damaged and can be used stably for a long period of time.

更に、上記可撓性のベルトガイドとして、トナー搬送
部材と接触する面に滑りのよい樹脂フィルムを張ったも
のを使用すると、トナー搬送部材とガイド部材との間の
滑りがよく、トナー搬送部材の駆動がスムーズに行われ
るようになり、トナー搬送部材をより長期に亙って安定
して使用できるようになった。
Further, when a flexible resin film having a slippery resin film stretched on a surface in contact with the toner conveying member is used as the flexible belt guide, the slip between the toner conveying member and the guide member is good, and the toner conveying member has Driving is performed smoothly, and the toner conveying member can be used stably for a longer period of time.

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

第1図はこの発明の実施例に係る現像装置の内部を示す
概略断面図、第2図は同実施例においてベルトガイドを
トナー搬送部材の側部に配する状態の一例を示した部分
斜視図、第3図は同実施例においてベルトガイドをトナ
ー搬送部材の側部に配する状態の変更例を示した部分斜
視図、第4図は同実施例の現像装置においてベルトガイ
ドを現像装置に取り付ける状態の変更例を示した部分概
略断面図、第5図〜第7図はこの発明の他の実施例に係
る現像装置を示し、第5図は現像装置の内部を示した概
略断面図、第6図及び第7図はベルトガイドをトナー搬
送部材の側部に配した状態の部分斜視図及び部分断面
図、第8図は従来の現像装置の内部を示した部分概略断
面図である。 (1)……現像装置,(2)……像担持体(感光体ドラ
ム),(9)……駆動ローラ,(10)……トナー搬送部
材,(12)……ベルトガイド。
FIG. 1 is a schematic sectional view showing the inside of a developing device according to an embodiment of the present invention, and FIG. 2 is a partial perspective view showing an example of a state where a belt guide is arranged on a side portion of a toner conveying member in the embodiment. FIG. 3 is a partial perspective view showing a modified example of the state in which the belt guide is arranged on the side of the toner conveying member in the embodiment. FIG. 4 is a diagram showing the state in which the belt guide is attached to the developing device in the developing device of the embodiment. 5 to 7 show a developing device according to another embodiment of the present invention, and FIG. 5 is a schematic sectional view showing the inside of the developing device. 6 and 7 are a partial perspective view and a partial cross-sectional view showing a state in which a belt guide is arranged on a side portion of a toner conveying member, and FIG. 8 is a partial schematic cross-sectional view showing the inside of a conventional developing device. (1) Developing device, (2) Image carrier (photosensitive drum), (9) Drive roller, (10) Toner conveying member, (12) Belt guide.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】回転駆動する駆動ローラと、この駆動ロー
ラの周長に対して僅かな余剰周長を有して駆動ローラに
外装され、この駆動ローラとの間に実質的に滑りのない
筒状の薄膜部材で構成されて像担持体と対面するトナー
搬送部材と、このトナー搬送部材の軸方向両端部であっ
て像担持体と対面する対面部を除く箇所において、この
トナー搬送部材を駆動ローラに圧接させると共に像担持
体との対面部でトナー搬送部材を駆動ローラより像担持
体側に突出させる可撓性のベルトガイドとを有すること
を特徴とする現像装置。
1. A driving roller which is rotatably driven, and a cylinder which is externally mounted on the driving roller with a slight extra peripheral length relative to the peripheral length of the driving roller, and has substantially no slippage between the driving roller and the driving roller. The toner conveying member is constituted by a thin film member having a shape, and the toner conveying member is driven at locations at both ends in the axial direction of the toner conveying member except for the opposing portions facing the image bearing member. A developing device comprising: a flexible belt guide that is brought into pressure contact with a roller and that projects a toner conveying member toward an image carrier from a driving roller at a portion facing the image carrier.
JP63207741A 1988-08-22 1988-08-22 Developing device Expired - Lifetime JP2754585B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63207741A JP2754585B2 (en) 1988-08-22 1988-08-22 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63207741A JP2754585B2 (en) 1988-08-22 1988-08-22 Developing device

Publications (2)

Publication Number Publication Date
JPH0256573A JPH0256573A (en) 1990-02-26
JP2754585B2 true JP2754585B2 (en) 1998-05-20

Family

ID=16544767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63207741A Expired - Lifetime JP2754585B2 (en) 1988-08-22 1988-08-22 Developing device

Country Status (1)

Country Link
JP (1) JP2754585B2 (en)

Also Published As

Publication number Publication date
JPH0256573A (en) 1990-02-26

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