JP2003028142A - Positioning mechanism and image forming device - Google Patents
Positioning mechanism and image forming deviceInfo
- Publication number
- JP2003028142A JP2003028142A JP2001220493A JP2001220493A JP2003028142A JP 2003028142 A JP2003028142 A JP 2003028142A JP 2001220493 A JP2001220493 A JP 2001220493A JP 2001220493 A JP2001220493 A JP 2001220493A JP 2003028142 A JP2003028142 A JP 2003028142A
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- Japan
- Prior art keywords
- positioning member
- axis
- abutting surface
- positioning
- abutting
- 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.)
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- Dry Development In Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、対向する２組の回
転部材の間隔を保つ位置決め機構に関するもので、特
に、回転部材間で位置がずれても間隔を一定に保つこと
のできる位置決め機構に関する。また、本発明は、この
ような位置決め機構が設けられた画像形成装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning mechanism for keeping a distance between two sets of rotating members facing each other, and more particularly to a positioning mechanism for keeping a constant distance even if the positions of rotating members are displaced. . The present invention also relates to an image forming apparatus provided with such a positioning mechanism.
【０００２】[0002]
【従来の技術】例えば、電子写真方式により画像を形成
する画像形成装置では、感光ドラムと呼ばれる円筒形状
の回転部材である潜像担持体に、やはり円筒形状の回転
部材である現像スリーブが対向配置され、潜像担持体に
形成された静電潜像に、現像スリーブに付着させたトナ
ーを転写してトナー像を形成し、このトナー像を用紙等
に転写そして定着させる構造となっている。2. Description of the Related Art For example, in an image forming apparatus for forming an image by an electrophotographic method, a developing sleeve, which is also a cylindrical rotating member, is arranged to face a latent image carrier, which is a cylindrical rotating member called a photosensitive drum. The toner adhered to the developing sleeve is transferred to the electrostatic latent image formed on the latent image carrier to form a toner image, and the toner image is transferred and fixed on a sheet or the like.
【０００３】このような画像形成装置において、高画質
な画像を提供するためには、潜像担持体と現像スリーブ
との間隔を所定の一定間隔に保つことで、潜像担持体に
良好なトナー像を形成することが重要である。In such an image forming apparatus, in order to provide a high-quality image, the latent image bearing member and the developing sleeve are kept at a predetermined constant distance so that the latent image bearing member has a good toner. It is important to form an image.
【０００４】ここで、上述した現像スリーブは、現像装
置と呼ばれるユニットに組み込まれ、画像形成装置本体
に対して着脱可能となっているものが多い。このため、
従来、例えば潜像担持体の両側に現像装置が突き当てら
れる位置決め部材を設け、この位置決め部材に現像装置
を突き当てた状態とすることで、潜像担持体と現像スリ
ーブの間隔を一定に保つようにしていた。Here, the above-mentioned developing sleeve is often incorporated in a unit called a developing device and is detachable from the main body of the image forming apparatus. For this reason,
Conventionally, for example, by providing a positioning member on both sides of the latent image carrier with which the developing device abuts, and by keeping the developing device abutting this positioning member, the gap between the latent image carrier and the developing sleeve is kept constant. Was doing.
【０００５】[0005]
【発明が解決しようとする課題】現像装置を画像形成装
置本体に対して着脱可能とするため、現像装置は画像形
成装置内でレール等により支持される構成となっている
が、このレールの精度等により、現像装置は画像形成装
置に対してある程度のガタをもって搭載されることにな
る。In order to make the developing device attachable to and detachable from the image forming apparatus main body, the developing device is supported by a rail or the like in the image forming apparatus. As a result, the developing device is mounted on the image forming apparatus with some play.
【０００６】このガタにより、画像形成装置本体側の潜
像担持体に対して現像装置側の現像スリーブの位置がず
れることがあるが、従来は、位置決め部材の取付精度に
依存して、潜像担持体と現像スリーブの間隔を一定に保
つようにしていた。このため、位置決め部材の取付精度
が狂うと、潜像担持体に対して現像スリーブの位置がず
れることで、潜像担持体と現像スリーブの間隔が変わっ
てしまうという問題があった。そして、潜像担持体と現
像スリーブの間隔が変わってしまうと、潜像担持体に良
好なトナー像が形成されず、形成される画像にムラがで
きる等の画質の悪化につながっていた。This backlash may cause the position of the developing sleeve on the developing device side to deviate from the latent image carrier on the image forming apparatus main body side. However, conventionally, the latent image depends on the mounting accuracy of the positioning member. The distance between the carrier and the developing sleeve is kept constant. Therefore, if the mounting accuracy of the positioning member is incorrect, the position of the developing sleeve with respect to the latent image carrier shifts, which causes a change in the distance between the latent image carrier and the developing sleeve. When the distance between the latent image carrier and the developing sleeve is changed, a good toner image is not formed on the latent image carrier, which leads to deterioration in image quality such as unevenness in the formed image.
【０００７】本発明は、このような課題を解決するため
になされたもので、潜像担持体や現像スリーブといった
回転部材間で位置のズレが生じても、部品の取り付け精
度に依存することなく両者の間隔を一定に保つ位置決め
機構およびこの位置決め機構を搭載した画像形成装置を
提供することを目的とする。The present invention has been made in order to solve such a problem, and does not depend on the mounting accuracy of parts even if a positional deviation occurs between rotating members such as a latent image carrier and a developing sleeve. An object of the present invention is to provide a positioning mechanism that keeps the distance between them constant and an image forming apparatus equipped with this positioning mechanism.
【０００８】[0008]
【課題を解決するための手段】本発明に係る位置決め機
構は、第１の軸を中心に回転する第１の回転部材と、第
１の軸と平行な第２の軸を中心に回転する第２の回転部
材とを備え、第１の回転部材と第２の回転部材を所定の
間隔を開けて対向させる位置決め機構において、第１の
軸を中心とした円の少なくとも一部からなる突き当て面
を備えた第１の位置決め部材と、第２の軸を中心とした
円の少なくとも一部からなる突き当て面を備えた第２の
位置決め部材とを備え、第１の位置決め部材は、その突
き当て面を第１の軸と第２の軸とを結ぶ法線方向に向け
て、第１の回転部材の軸方向の両側に設けられるととも
に、第２の位置決め部材は、その突き当て面を第１の軸
と第２の軸とを結ぶ法線方向に向けて、第２の回転部材
の軸方向の両側で、かつ第１の位置決め部材と対向する
位置に設けられ、第１の位置決め部材の突き当て面と第
２の位置決め部材の突き当て面を、第１の軸と第２の軸
とを結ぶ線の方向に押し付けるような方向の成分を持つ
力で押し付ける押圧手段を設けたものである。A positioning mechanism according to the present invention comprises a first rotating member which rotates about a first shaft and a second rotating member which rotates about a second shaft parallel to the first shaft. In a positioning mechanism including two rotating members, the first rotating member and the second rotating member are opposed to each other at a predetermined interval, an abutting surface formed of at least a part of a circle centered on the first axis. And a second positioning member having an abutting surface formed of at least a part of a circle centered on the second axis, the first positioning member including the abutting surface. The surfaces are provided on both sides in the axial direction of the first rotating member with the surfaces oriented in the normal direction connecting the first axis and the second axis, and the second positioning member has the abutting surface of the first positioning member. On both sides in the axial direction of the second rotating member in the direction of the normal line connecting the axis of and the second axis. A direction of a line connecting the abutment surface of the first positioning member and the abutment surface of the second positioning member, the first axis and the second axis being provided at a position facing the first positioning member. It is provided with a pressing means for pressing with a force having a component in the direction of pressing against.
【０００９】上述した本発明に係る位置決め機構によれ
ば、第１の回転部材と第２の回転部材の両側で、第１の
位置決め部材の突き当て目と第２の位置決め部材の突き
当て面が、常時押圧された状態で当接している。According to the above-described positioning mechanism of the present invention, the abutment point of the first positioning member and the abutment surface of the second positioning member are provided on both sides of the first rotating member and the second rotating member. , Are always in contact with each other while being pressed.
【００１０】第１の回転部材に対して第２の回転部材の
位置がその接線方向に変化しようとすると、第１の位置
決め部材の突き当て面と第２の位置決め部材の突き当て
面との接触個所が変化する。しかしながら、第１の位置
決め部材の突き当て面と第２の位置決め部材の突き当て
面は、それぞれ回転部材の軸を中心とした円の少なくと
も一部であるので、接触個所が変化しても、第１の軸と
第２の軸の間隔は変化しない。よって、第１の回転部材
と第２の回転部材との間に設定してある所定の間隔を保
持することができる。When the position of the second rotary member changes with respect to the tangential direction of the first rotary member, the abutting surface of the first positioning member and the abutting surface of the second positioning member come into contact with each other. The point changes. However, since the abutting surface of the first positioning member and the abutting surface of the second positioning member are each at least part of a circle centered on the axis of the rotating member, even if the contact point changes, The distance between the first axis and the second axis does not change. Therefore, it is possible to maintain the predetermined interval set between the first rotating member and the second rotating member.
【００１１】ここで、例えば、上述した第１の位置決め
部材は、その突き当て面として、中心が一致しかつ径の
異なるそれぞれの円の少なくとも一部からなる第１およ
び第２の突き当て面を、少なくとも第１の軸と第２の軸
とを結ぶ法線に沿って備え、その内周側となる第２の突
き当て面の径を、第１の軸を中心とした円周面からなる
第１の支持部の径と一致させたものである。Here, for example, the first positioning member described above has, as its abutting surfaces, first and second abutting surfaces formed by at least a part of respective circles having the same center and different diameters. , At least along a normal line connecting the first axis and the second axis, and having a diameter of a second butting surface which is an inner peripheral side of the second abutting surface is formed by a circumferential surface having the first axis as a center. The diameter is made to match the diameter of the first support portion.
【００１２】また、第２の位置決め部材は、その突き当
て面として、中心が一致しかつ径の異なるそれぞれの円
の少なくとも一部からなる第１および第２の突き当て面
を、少なくとも第１の軸と第２の軸とを結ぶ法線に沿っ
て備え、その内周側となる第２の突き当て面の径を、第
２の軸を中心とした円周面からなる第２の支持部の径と
一致させたものである。Further, the second positioning member has at least first and second abutting surfaces, which are at least a part of circles having the same center and different diameters, as their abutting surfaces. A second support portion that is provided along a normal line that connects the shaft and the second shaft, and has a diameter of a second abutting surface that is an inner peripheral side thereof and that is a circumferential surface centered on the second shaft. It is the same as the diameter of.
【００１３】そして、第１の位置決め部材は、その内周
側となる第２の突き当て面を第１の支持部に当接させて
取り付けられるとともに、第２の位置決め部材は、その
内周側となる第２の突き当て面を第２の支持部に当接さ
せて取り付けられるものである。The first positioning member is attached with the second abutting surface, which is the inner peripheral side thereof, brought into contact with the first supporting portion, and the second positioning member has the inner peripheral side thereof. The second abutting surface to be attached is brought into contact with the second support portion to be attached.
【００１４】これによれば、第１の回転部材と第２の回
転部材の両側で、第１の位置決め部材のその外周側とな
る第１の突き当て面と、第２の位置決め部材の外周側と
なる第１の突き当て面が、常時押圧された状態で当接し
ている。According to this, on both sides of the first rotating member and the second rotating member, the first abutting surface which is the outer peripheral side of the first positioning member and the outer peripheral side of the second positioning member. The first abutting surface that is abutted with is always pressed in contact.
【００１５】第１の位置決め部材は、第１の軸を中心と
した円周面に対して、同心同径の円を描く第２の突き当
て面を当接させているので、第１の位置決め部材は、そ
の取付位置がずれたとしても、第１の軸を中心とした回
転動作となる。これにより、第１の位置決め部材の第１
の突き当て面は、常に第１の軸を中心とした円形の軌跡
を描く。同様に、第２の位置決め部材の第１の突き当て
面は、常に第２の軸を中心とした円形の軌跡を描く。In the first positioning member, the second abutting surface that draws a circle having the same diameter and the same diameter is brought into contact with the circumferential surface centered on the first axis. Even if the mounting position of the member is deviated, the member is rotated about the first axis. Thereby, the first positioning member of the first positioning member
The abutting surface of always draws a circular locus about the first axis. Similarly, the first butting surface of the second positioning member always draws a circular locus about the second axis.
【００１６】ここで、第１の回転部材と第２の回転部材
の位置が、その接線方向にずれようとする場合、第１の
位置決め部材の第１の突き当て面と第２の位置決め部材
の第１の突き当て面の接触個所は変わる。Here, when the positions of the first rotary member and the second rotary member are about to shift in the tangential direction, the first abutting surface of the first positioning member and the second positioning member of the second positioning member. The contact point of the first butting surface changes.
【００１７】しかしながら、第１の位置決め部材および
第２の位置決め部材のそれぞれの第１の突き当て面は、
常にその軸を中心とした円形の軌跡を描くので、第２の
軸のとり得る軌跡は、第１の軸を中心とした円となる。
よって、第１の回転部材と第２の回転部材の位置がずれ
ても、第１の軸と第２の軸の間隔は変化しない。これに
より、第１の回転部材と第２の回転部材との間に設定し
てある所定の間隔を保つことができる。However, the first butting surfaces of the first positioning member and the second positioning member are, respectively,
Since a circular locus around the axis is always drawn, the locus that the second axis can take is a circle around the first axis.
Therefore, even if the positions of the first rotating member and the second rotating member deviate from each other, the distance between the first shaft and the second shaft does not change. This makes it possible to maintain the predetermined distance set between the first rotating member and the second rotating member.
【００１８】また、本発明に係る画像形成装置は、上述
した本発明の位置決め機構を応用したものである。すな
わち、第１の軸を中心とした円筒形状の潜像担持体に、
第２の軸を中心とした円筒形状の現像スリーブを対向配
置して、現像スリーブにより潜像担持体にトナー像を形
成する画像形成装置において、潜像担持体と現像スリー
ブを所定の間隔を開けて対向させる位置決め機構とし
て、第１の軸を中心とした円の少なくとも一部からなる
突き当て面を備えた第１の位置決め部材と、第２の軸を
中心とした円の少なくとも一部からなる突き当て面を備
えた第２の位置決め部材とを備え、第１の位置決め部材
は、その突き当て面を第１の軸と第２の軸とを結ぶ法線
方向に向けて、潜像担持体の軸方向の両側に取り付けら
れるとともに、第２の位置決め部材は、その突き当て面
を第１の軸と第２の軸とを結ぶ法線方向に向けて、現像
スリーブの軸方向の両側で、かつ第１の位置決め部材と
対向する位置に取り付けられ、第１の位置決め部材の突
き当て面と第２の位置決め部材の突き当て面を、第１の
軸と第２の軸とを結ぶ法線と沿った方向に押し付ける押
圧手段を設けたものである。このように、本発明の位置
決め機構を画像形成装置に応用することで、回転部材と
しての潜像担持体と現像ローラの間隔は一定に保たれ、
良好なトナー像が得られる。The image forming apparatus according to the present invention is an application of the above-described positioning mechanism of the present invention. That is, in the cylindrical latent image carrier about the first axis,
In an image forming apparatus in which cylindrical developing sleeves centering on a second axis are opposed to each other and a toner image is formed on the latent image bearing member by the developing sleeve, a predetermined space is provided between the latent image bearing member and the developing sleeve. The first positioning member having an abutting surface formed of at least a part of a circle centered on the first axis, and the at least one part of a circle centered on the second axis as a positioning mechanism to be opposed to each other. A second positioning member having an abutting surface, wherein the first positioning member has its abutting surface oriented in a normal direction connecting the first axis and the second axis. The second positioning member is attached to both sides of the developing sleeve in the axial direction of the developing sleeve, with the abutting surface of the second positioning member directed in the normal direction connecting the first axis and the second axis. And at a position facing the first positioning member. And a pressing means for pressing the abutting surface of the first positioning member and the abutting surface of the second positioning member in a direction along a normal line connecting the first axis and the second axis. Is. As described above, by applying the positioning mechanism of the present invention to the image forming apparatus, the gap between the latent image carrier as a rotating member and the developing roller is kept constant,
A good toner image can be obtained.
【００１９】[0019]
【発明の実施の形態】図１は本発明の位置決め機構の実
施の形態の一例を示す斜視図である。本実施の形態の位
置決め機構は、対向する回転部材間のそれぞれの軸を中
心とした円弧同士を接触させる位置決め部材を設けるこ
とで、対向する回転部材間で位置がずれても、対向する
回転部材の間隔を一定に保てるようにしたものである。1 is a perspective view showing an example of an embodiment of a positioning mechanism of the present invention. The positioning mechanism of the present embodiment is provided with a positioning member that makes arcs centered around respective axes between opposing rotating members contact each other, so that the rotating members facing each other even if their positions are displaced from each other. It is designed so that the interval of can be kept constant.
【００２０】ここで、本実施の形態の位置決め機構は、
例えば画像形成装置に組み込まれるものである。すなわ
ち、画像形成装置では、回転部材としての回転ドラム
（潜像担持体）と現像スリーブの間隔を一定に保つこと
で、良好なトナー像を得ることができる。よって、感光
ドラムと現像スリーブの間隔を一定に保つため、本実施
の形態の位置決め機構が組み込まれるもので、図１に示
す実施の形態は、位置決め機構が組み込まれた画像形成
装置を示している。以下、本実施の形態の位置決め機構
を画像形成装置の実施の形態の一例として説明する。Here, the positioning mechanism of this embodiment is
For example, it is incorporated in an image forming apparatus. That is, in the image forming apparatus, a good toner image can be obtained by keeping the distance between the rotary drum (latent image carrier) as a rotary member and the developing sleeve constant. Therefore, in order to keep the distance between the photosensitive drum and the developing sleeve constant, the positioning mechanism of the present embodiment is incorporated. The embodiment shown in FIG. 1 shows an image forming apparatus incorporating the positioning mechanism. . Hereinafter, the positioning mechanism of the present embodiment will be described as an example of the embodiment of the image forming apparatus.
【００２１】なお、図１においては、画像形成装置に組
み込まれた位置決め機構を明示するため、第１の回転部
材の一例である感光ドラム１を透視して、その軸受け２
の近傍を露出させるとともに、現像装置３のカバー３ａ
の一部を破断面として、第２の回転部材の一例としての
現像スリーブ４を露出させたものである。In FIG. 1, in order to clearly show the positioning mechanism incorporated in the image forming apparatus, the photosensitive drum 1 which is an example of the first rotating member is seen through and the bearing 2 thereof is provided.
And the cover 3a of the developing device 3 are exposed.
The developing sleeve 4 as an example of the second rotating member is exposed with a part of the broken surface as a fracture surface.
【００２２】画像形成装置には枠体５が取り付けられ、
感光ドラム１はこの枠体５に取り付けられる。感光ドラ
ム１は円筒形状で、その両端に回転の中心となる第１の
軸１ａが設けられる。なお、図１においては、感光ドラ
ム１およびその他の機構の一方の端部側のみを表示して
いる。A frame 5 is attached to the image forming apparatus,
The photosensitive drum 1 is attached to the frame body 5. The photosensitive drum 1 has a cylindrical shape, and a first shaft 1a that serves as a center of rotation is provided at both ends of the photosensitive drum 1. In FIG. 1, only one end of the photosensitive drum 1 and the other mechanism is shown.
【００２３】枠体５は、矢印ａで示す正面方向から見て
左右両側に設けられる壁部５ａにボールベアリング等の
軸受け２が取り付けられている。そして、感光ドラム１
は、その両端の第１の軸１ａがそれぞれ軸受け２により
支持される。また、この軸受け２は、第１の位置決め部
材６を支持する第１の支持部としても機能する。In the frame body 5, bearings 2 such as ball bearings are attached to wall portions 5a provided on both left and right sides when viewed from the front direction indicated by the arrow a. And the photosensitive drum 1
The first shafts 1a at both ends thereof are supported by the bearings 2, respectively. Further, the bearing 2 also functions as a first support portion that supports the first positioning member 6.
【００２４】第１の位置決め部材６は、左右の壁部５ａ
のそれぞれにネジ等により取り付けられる。図２は第１
の位置決め部材６の構成および取り付け状態の詳細を示
す説明図である。The first positioning member 6 includes the left and right wall portions 5a.
It is attached to each of with a screw or the like. Figure 1 is the first
It is explanatory drawing which shows the structure of the positioning member 6 of FIG.
【００２５】第１の位置決め部材６には、円弧形状の第
１の突き当て面６ａおよび第２の突き当て面６ｂが備え
られている。これら第１の突き当て面６ａと第２の突き
当て面６ｂの中心Ｏは、図２（ａ）に示すように一致さ
せてあり、第１の突き当て面６ａは中心Ｏから半径Ｒ１
の円弧、第２の突き当て面６ｂは中心Ｏから半径Ｒ２
（＜Ｒ１）の円弧である。これにより、外周側となる第
１の突き当て面６ａは凸状、内周側となる第２の突き当
て面６ｂは凹状となる。The first positioning member 6 is provided with an arc-shaped first abutting surface 6a and a second abutting surface 6b. The centers O of the first butting surface 6a and the second butting surface 6b are aligned as shown in FIG. 2 (a), and the first butting surface 6a has a radius R1 from the center O.
Of the arc, the second butting surface 6b has a radius R2 from the center O.
It is an arc of (<R1). As a result, the first abutting surface 6a on the outer peripheral side has a convex shape, and the second abutting surface 6b on the inner peripheral side has a concave shape.
【００２６】第２の突き当て面６ｂの径は、軸受け２の
径と同等として、第２の突き当て面６ｂの形状と軸受け
２の外周面の形状を合致させる。すなわち、第１の軸受
け１ａの半径ｒ１＝第２の突き当て面６ｂの半径Ｒ２と
なる。なお、軸受け２の内周面および外周面は、第１の
軸１ａを中心とした円形である。The diameter of the second abutment surface 6b is equal to the diameter of the bearing 2, and the shape of the second abutment surface 6b and the shape of the outer peripheral surface of the bearing 2 are matched. That is, the radius r1 of the first bearing 1a = the radius R2 of the second butting surface 6b. The inner peripheral surface and the outer peripheral surface of the bearing 2 are circular with the first shaft 1a as the center.
【００２７】そして、第２の突き当て面６ｂを軸受け２
の外周面に当接させて壁部５ａに取り付けることで、図
２（ｂ）に示すように、第２の突き当て面６ｂは軸受け
２に支持される第１の軸１ａの中心Ｏ1と同心の半径Ｒ
２の円の一部となり、同様に、第１の突き当て面６ａは
第１の軸１ａの中心Ｏ1と同心のＲ１の円の一部とな
る。Then, the second butting surface 6b is used as the bearing 2
2B, the second abutment surface 6b is attached to the wall 5a by being brought into contact with the outer peripheral surface of the first shaft 1a and the center O 1 of the first shaft 1a supported by the bearing 2. As shown in FIG. Concentric radius R
The first butting surface 6a becomes a part of the circle of R1 which is concentric with the center O 1 of the first axis 1a.
【００２８】また、第１の位置決め部材６の位置がずれ
ても、第２の突き当て面６ｂと軸受け２の外周が当接し
ている状態では、第１の位置決め部材６の動作は第１の
軸１ａを中心とした回転動作になり、第１の突き当て面
６ａは中心Ｏ1と同心の円形の軌跡を描く。Even if the position of the first positioning member 6 is deviated, the operation of the first positioning member 6 is the first when the second abutting surface 6b and the outer periphery of the bearing 2 are in contact with each other. The rotation is about the axis 1a, and the first butting surface 6a draws a circular locus concentric with the center O 1 .
【００２９】図１に戻り、画像形成装置には現像装置３
が搭載される。現像装置３は、画像形成装置に対して着
脱可能となっており、図示しないガイド機構等により支
持されて、例えば、矢印ｂ方向の移動で画像形成装置に
対して着脱される。この現像装置３に設けられる現像ス
リーブ４は円筒形状で、その両端に回転の中心となる第
２の軸４ａが設けられる。現像装置３のカバー３ａには
ボールベアリング等の軸受け７が取り付けられ、現像ス
リーブ４は、その両端の第２の軸４ａがそれぞれ軸受け
７により支持される。また、カバー３ａには開口部３ｂ
が設けられ、現像スリーブ４は円周面の一部がその軸方
向に沿って露出している。Returning to FIG. 1, the developing device 3 is included in the image forming apparatus.
Will be installed. The developing device 3 is attachable / detachable to / from the image forming device, is supported by a guide mechanism or the like (not shown), and is attached / detached to / from the image forming device by, for example, moving in the arrow b direction. The developing sleeve 4 provided in the developing device 3 has a cylindrical shape, and has a second shaft 4a serving as a center of rotation provided at both ends thereof. A bearing 7 such as a ball bearing is attached to the cover 3a of the developing device 3, and the developing sleeve 4 has second shafts 4a at both ends thereof supported by the bearings 7, respectively. Also, the cover 3a has an opening 3b.
And a part of the circumferential surface of the developing sleeve 4 is exposed along the axial direction.
【００３０】なお、現像装置３は、図示しないがトナー
とキャリアからなる現像剤を収納しておき、これを現像
スリーブ４に供給し、そして現像スリーブ４からトナー
を消費した現像剤を回収して再利用するための機構等が
備えられている。Although not shown, the developing device 3 stores a developer consisting of toner and carrier, supplies the developer to the developing sleeve 4, and collects the toner-consuming developer from the developing sleeve 4. A mechanism for reuse is provided.
【００３１】現像スリーブ４の第２の軸４ａは、カバー
３ａから露出する長さを有する。そして、この第２の軸
４ａのカバー３ａから露出した部分は、第２の位置決め
部材８を支持する第２の支持部として機能する。The second shaft 4a of the developing sleeve 4 has a length exposed from the cover 3a. The portion of the second shaft 4a exposed from the cover 3a functions as a second support portion that supports the second positioning member 8.
【００３２】第２の位置決め部材８は、第２の軸４ａに
回転可能に取り付けられるベアリングで、その外輪が円
形のゴム等でカバーされており、この外周の円周面が第
１の突き当て面８ａになるとともに、内輪の内周面が第
２の突き当て面８ｂとなる。これにより、第１の突き当
て面８ａおよび第２の突き当て面８ｂは第２の軸４ａを
中心とした円形である。また、第２の位置決め部材８は
ベアリングであることから、第１の突き当て面８ａは、
常に第２の軸４ａを中心とした円形の軌跡を描く。The second positioning member 8 is a bearing rotatably mounted on the second shaft 4a, and the outer ring of the second positioning member 8 is covered with a circular rubber or the like. While becoming the surface 8a, the inner peripheral surface of the inner ring becomes the second abutting surface 8b. Thus, the first butting surface 8a and the second butting surface 8b are circular with the second axis 4a as the center. Further, since the second positioning member 8 is a bearing, the first butting surface 8a is
Always draw a circular locus around the second axis 4a.
【００３３】そして、現像装置３を画像形成装置に搭載
すると、感光ドラム１側に取り付けてある第１の位置決
め部材６の第１の突き当て面６ａと、現像装置３側に取
り付けてある第２の位置決め部材８の第１の突き当て面
８ａが当接する。When the developing device 3 is mounted on the image forming apparatus, the first abutting surface 6a of the first positioning member 6 attached to the photosensitive drum 1 side and the second abutting surface 6a attached to the developing device 3 side. The first butting surface 8a of the positioning member 8 comes into contact.
【００３４】図３は感光ドラム１と現像スリーブ４の位
置関係を示す側面図である。画像形成装置に現像装置３
が搭載されると、感光ドラム１に現像スリーブ４が対向
する。第１の位置決め部材６は、現像装置３が搭載され
たときの第１の軸１ａと第２の軸４ａを結ぶ法線上に取
り付けられる。そして、現像装置３が画像形成装置に搭
載されると、第１の位置決め部材６の第１の突き当て面
６ａと第２の位置決め部材の第１の突き当て面８ａが当
接して、感光ドラム１と現像スリーブ４の間に所定の間
隔Ｄｓｄを形成する。ここで、現像装置３は図示しない
押圧手段により矢印ｃ方向に押圧されており、これによ
り、第１の位置決め部材６の第１の突き当て面６ａと第
２の位置決め部材８の第１の突き当て面８ａとの接点に
おいては、互いを法線（第１の軸１ａと第２の軸４ａを
結ぶ線）方向に押し付けるような力が加わる。よって、
第１の位置決め部材６の第１の突き当て面６ａと第２の
位置決め部材８の第１の突き当て面８ａは当接した状態
を保持する。FIG. 3 is a side view showing the positional relationship between the photosensitive drum 1 and the developing sleeve 4. The image forming apparatus includes a developing device 3
Is mounted, the developing sleeve 4 faces the photosensitive drum 1. The first positioning member 6 is attached on a normal line connecting the first shaft 1a and the second shaft 4a when the developing device 3 is mounted. Then, when the developing device 3 is mounted on the image forming apparatus, the first butting surface 6a of the first positioning member 6 and the first butting surface 8a of the second positioning member come into contact with each other, and the photosensitive drum A predetermined distance Dsd is formed between the developing sleeve 1 and the developing sleeve 4. Here, the developing device 3 is pressed in the direction of arrow c by a pressing means (not shown), which causes the first abutting surface 6a of the first positioning member 6 and the first abutting surface of the second positioning member 8. At the contact point with the contact surface 8a, a force that presses each other in the direction of the normal line (the line connecting the first shaft 1a and the second shaft 4a) is applied. Therefore,
The first abutting surface 6a of the first positioning member 6 and the first abutting surface 8a of the second positioning member 8 hold the abutting state.
【００３５】そして上述した間隔Ｄｓｄを形成するた
め、感光ドラム１と現像スリーブ４の径および第１の位
置決め部材６の第１の突き当て面６ａと第２の位置決め
部材８の第１の突き当て面８ｂの径の関係は、以下のよ
うになる。Then, in order to form the above-mentioned distance Dsd, the diameters of the photosensitive drum 1 and the developing sleeve 4, the first butting surface 6a of the first positioning member 6 and the first butting surface of the second positioning member 8 are set. The relationship of the diameter of the surface 8b is as follows.
【００３６】ここで、第１の位置決め部材６は、第２の
突き当て面６ａが軸受け２に当接した状態で固定されて
いることで、第１の突き当て面６ａは、Ｏ1を中心とし
た円弧である。Since the first positioning member 6 is fixed with the second abutting surface 6a in contact with the bearing 2, the first abutting surface 6a is centered on O 1 . It is an arc.
【００３７】よって、感光ドラム１の径をｒ２、現像ス
リーブ４の径をｒ３、第１の位置決め部材６の第１の突
き当て面６ａの径をＲ１、第２の位置決め部材８の第１
の突き当て面８ｂの第２の軸４ａの中心Ｏ2からの径を
Ｒ３としたとき、ｒ２＋ｒ３＋Ｄｓｄ＝Ｒ１＋Ｒ３とな
るように、第１の位置決め部材６の第１の突き当て面６
ａの径Ｒ１と第２の位置決め部材８の第１の突き当て面
８ｂの径Ｒ３を決める。Therefore, the diameter of the photosensitive drum 1 is r2, the diameter of the developing sleeve 4 is r3, the diameter of the first abutting surface 6a of the first positioning member 6 is R1, and the first positioning member 8 is first.
The first abutting surface 6 of the first positioning member 6 is such that r2 + r3 + Dsd = R1 + R3, where R3 is the diameter of the abutting surface 8b from the center O 2 of the second shaft 4a.
The diameter R1 of a and the diameter R3 of the first butting surface 8b of the second positioning member 8 are determined.
【００３８】ここで、第１の位置決め部材６および第２
の位置決め部材８は、図１では一方の側しか図示してい
ないが、感光ドラム１および現像スリーブ４の両側に同
じ構造のものが設けられるものである。よって、感光ド
ラム１と現像スリーブ４との間隔Ｄｓｄは、感光ドラム
１と現像スリーブ４の軸方向全域において一定となる。Here, the first positioning member 6 and the second positioning member 6
Although only one side is shown in FIG. 1 for the positioning member 8, the positioning member 8 having the same structure is provided on both sides of the photosensitive drum 1 and the developing sleeve 4. Therefore, the distance Dsd between the photosensitive drum 1 and the developing sleeve 4 is constant in the entire axial direction of the photosensitive drum 1 and the developing sleeve 4.
【００３９】図４は本実施の形態の位置決め機構の動作
を示す説明図である。ここで、図４（ａ）は感光ドラム
１と現像スリーブ４の位置関係が正常な状態、図４
（ｂ）は感光ドラム１と現像スリーブ４の位置関係がず
れた状態、図４（ｃ）は第１の位置決め部材６の取り付
け位置がずれた状態を示す。FIG. 4 is an explanatory view showing the operation of the positioning mechanism of this embodiment. Here, FIG. 4A shows a state in which the positional relationship between the photosensitive drum 1 and the developing sleeve 4 is normal.
4B shows a state in which the positional relationship between the photosensitive drum 1 and the developing sleeve 4 is displaced, and FIG. 4C shows a state in which the mounting position of the first positioning member 6 is displaced.
【００４０】図４（ａ）に示すように、第１の軸１ａの
中心Ｏ1を通る法線Ｌ１上に第２の軸４ａの中心Ｏ2が位
置する状態を、感光ドラム１と現像スリーブ４の位置関
係が正常な状態とする。また、第１の位置決め部材６が
この法線Ｌ１に沿った位置にある場合を、第１の位置決
め部材６が正常に取り付けられている状態とする。As shown in FIG. 4 (a), a state where the center O 2 of the second shaft 4a is positioned on the normal line L1 passing through the center O 1 of the first shaft 1a, the photosensitive drum 1 and the developing sleeve It is assumed that the positional relationship of 4 is normal. Further, when the first positioning member 6 is located along the normal line L1, the first positioning member 6 is normally attached.
【００４１】そして、第１の位置決め部材６の第１の突
き当て面６ａと第２の位置決め部材８の第１の突き当て
面８ａが当接していることで、この接触個所までの第１
の軸１ａからの距離は第１の位置決め部材６の第１の突
き当て面６ａの径Ｒ１である。また、この接触個所まで
の第２の軸４ａからの距離は第２の位置決め部材８の第
１の突き当て面８ａの径Ｒ３である。よって、図３に示
す関係から、感光ドラム１と現像スリーブ４の間に所定
の間隔Ｄｓｄが形成される。Since the first abutting surface 6a of the first positioning member 6 and the first abutting surface 8a of the second positioning member 8 are in contact with each other, the first abutting point up to this contact point is reached.
The distance from the axis 1a is the diameter R1 of the first butting surface 6a of the first positioning member 6. The distance from the second shaft 4a to the contact point is the diameter R3 of the first butting surface 8a of the second positioning member 8. Therefore, from the relationship shown in FIG. 3, a predetermined distance Dsd is formed between the photosensitive drum 1 and the developing sleeve 4.
【００４２】現像装置３は画像形成装置に対して着脱可
能な構造で、かつ、現像装置３は図３に示すように矢印
ｃ方向に押圧されていることから、各部のガタ等に起因
して、図４（ｂ）に示すように、現像装置３の位置が矢
印ｄ方向にずれる場合が考えられる。このとき、第２の
軸４ａの中心Ｏ2は法線Ｌ１上からずれるが、図示しな
い押圧手段で現像装置３が押圧されていることから、第
１の位置決め部材６の第１の突き当て面６ａと第２の位
置決め部材８の第１の突き当て面８ａとは、その接触個
所がずれた状態で、当接した状態を保持する。The developing device 3 has a structure detachable from the image forming apparatus, and the developing device 3 is pressed in the direction of arrow c as shown in FIG. As shown in FIG. 4B, the position of the developing device 3 may be displaced in the direction of arrow d. At this time, the center O 2 of the second shaft 4a deviates from the normal line L1, but since the developing device 3 is pressed by the pressing means (not shown), the first butting surface of the first positioning member 6 is pressed. 6a and the first abutting surface 8a of the second positioning member 8 are held in contact with each other with their contact points displaced.
【００４３】そして、第１の位置決め部材６の第１の突
き当て面６ａは第１の軸１ａの中心Ｏ1と同心の円弧で
あり、第２の位置決め部材８の第１の突き当て面８ａは
第２の軸４ａの中心Ｏ2と同心の円周面であるので、そ
の接触個所がずれても、この接触個所までの第１の軸１
ａからの距離は第１の位置決め部材６の第１の突き当て
面６ａの径Ｒ１である。また、この接触個所までの第２
の軸４ａからの距離は第２の位置決め部材８の第１の突
き当て面８ａの径Ｒ３である。よって、図３に示す関係
から、感光ドラム１と現像スリーブ４の間に所定の間隔
Ｄｓｄが形成される。The first abutting surface 6a of the first positioning member 6 is a circular arc concentric with the center O 1 of the first shaft 1a, and the first abutting surface 8a of the second positioning member 8 is formed. Is a circumferential surface that is concentric with the center O 2 of the second shaft 4a, so that even if the contact point shifts, the first shaft 1 up to this contact point 1
The distance from a is the diameter R1 of the first abutting surface 6a of the first positioning member 6. In addition, the second to this contact point
The distance from the axis 4a is the diameter R3 of the first butting surface 8a of the second positioning member 8. Therefore, from the relationship shown in FIG. 3, a predetermined distance Dsd is formed between the photosensitive drum 1 and the developing sleeve 4.
【００４４】各部品が持つ誤差等に起因して、図４
（ｃ）に示すように、第１の位置決め部材６の取り付け
位置がずれる場合が考えられる。このとき、第１の位置
決め部材６は法線Ｌ１上からずれるが、図示しない押圧
手段で現像装置３が押圧されていることから、第１の位
置決め部材６の第１の突き当て面６ａと第２の位置決め
部材８の第１の突き当て面８ａとは、その接触個所がず
れた状態で、当接した状態を保持する。なお、第１の位
置決め部材６の取り付け位置がずれた場合、第１の位置
決め部材６の第１の突き当て面６ａと第２の位置決め部
材８の第１の突き当て面８ａとの接触個所はずれるが、
この接触個所は法線Ｌ１上に位置する。また、第１の位
置決め部材６の第２の突き当て面６ｂと軸受け２も、そ
の接触個所がずれた状態で、当接した状態を保持する。FIG. 4 is caused by an error or the like of each part.
As shown in (c), the mounting position of the first positioning member 6 may be displaced. At this time, the first positioning member 6 deviates from the normal line L1, but since the developing device 3 is pressed by the pressing means (not shown), the first abutting surface 6a of the first positioning member 6 and The second abutting surface 8a of the positioning member 8 holds the abutting state in a state where the contact point is displaced. When the mounting position of the first positioning member 6 is deviated, the contact point between the first abutting surface 6a of the first positioning member 6 and the first abutting surface 8a of the second positioning member 8 is displaced. But,
This contact point is located on the normal line L1. Further, the second butting surface 6b of the first positioning member 6 and the bearing 2 are also kept in contact with each other with their contact points displaced.
【００４５】そして、第２の突き当て面６ｂと軸受け２
は同径であることから、第１の位置決め部材６の位置が
ずれても、第１の位置決め部材６の動作は第１の軸１ａ
を中心とした回転動作になり、第１の突き当て面６ａは
第１の軸１ａの中心Ｏ1と同心の円形の軌跡を描く。Then, the second butting surface 6b and the bearing 2
Have the same diameter, even if the position of the first positioning member 6 is deviated, the operation of the first positioning member 6 can be performed by the first shaft 1a.
As a result, the first abutting surface 6a draws a circular locus concentric with the center O 1 of the first shaft 1a.
【００４６】よって、第１の位置決め部材６の取り付け
位置がずれたことにより、第１の位置決め部材６の第１
の突き当て面６ａと第２の位置決め部材８の第１の突き
当て面８ａの接触個所がずれても、この接触個所までの
第１の軸１ａからの距離は第１の位置決め部材６の第１
の突き当て面６ａの径Ｒ１である。また、この接触個所
までの第２の軸４ａからの距離は第２の位置決め部材８
の第１の突き当て面８ａの径Ｒ３である。よって、図３
に示す関係から、感光ドラム１と現像スリーブ４の間に
所定の間隔Ｄｓｄが形成される。Therefore, since the mounting position of the first positioning member 6 is deviated, the first positioning member 6 is moved to the first position.
Even if the contact point between the abutting surface 6a of the first positioning member 8 and the first abutting surface 8a of the second positioning member 8 is displaced, the distance from the first shaft 1a to the contact point is the same as that of the first positioning member 6. 1
It is the diameter R1 of the abutting surface 6a. Further, the distance from the second shaft 4a to the contact point is determined by the second positioning member 8
Is the diameter R3 of the first butting surface 8a. Therefore, FIG.
From the relationship shown in (1), a predetermined distance Dsd is formed between the photosensitive drum 1 and the developing sleeve 4.
【００４７】ここで、第１の位置決め部材６の第２の突
き当て面６ｂは、軸受け２と同じ径を持つ円弧として形
成される必要があるが、この精度を出すことは容易であ
る。これに対して、第１の位置決め部材６の取り付け位
置の精度を上げることは困難である。しかしながら、第
２の突き当て面６ｂの精度が出ていれば、その取り付け
位置に誤差が生じても、第１の突き当て面６ａは第１の
軸１ａを中心とした円の一部となるので、感光ドラム１
と現像スリーブ４の間隔を所定の間隔（Ｄｓｄ）に保つ
ことが可能となる。Here, the second abutting surface 6b of the first positioning member 6 needs to be formed as an arc having the same diameter as the bearing 2, but this accuracy can be easily obtained. On the other hand, it is difficult to improve the accuracy of the mounting position of the first positioning member 6. However, if the accuracy of the second abutting surface 6b is high, the first abutting surface 6a becomes a part of a circle centered on the first axis 1a even if an error occurs in the mounting position. So the photosensitive drum 1
It is possible to keep the distance between the developing sleeve 4 and the developing sleeve 4 at a predetermined distance (Dsd).
【００４８】そして、画像形成装置において、感光ドラ
ム１と現像スリーブ４の間隔を所定の間隔（Ｄｓｄ）に
保つことは、感光ドラム１上に良好なトナー像を形成す
ることで、高画質な画像を得ることにつながる。本実施
の形態の位置決め機構は、画像形成層装置に適用される
ことで、各部のガタや部品精度等に起因して、現像スリ
ーブ４の位置がずれたり第１の位置決め部材６の取り付
け位置がずれても、感光ドラム１と現像スリーブ４の間
隔を所定の間隔Ｄｓｄに保つことができる。これによ
り、簡単な構造で、かつ部品の精度によらず、高画質な
画像が得られる画像形成装置が提供できる。In the image forming apparatus, keeping the distance between the photosensitive drum 1 and the developing sleeve 4 at a predetermined distance (Dsd) forms a good toner image on the photosensitive drum 1 to form a high quality image. To get to. The positioning mechanism according to the present embodiment is applied to the image forming layer device, so that the position of the developing sleeve 4 is displaced or the mounting position of the first positioning member 6 is changed due to the backlash of each part, the accuracy of parts, and the like. Even if they are displaced, the distance between the photosensitive drum 1 and the developing sleeve 4 can be maintained at a predetermined distance Dsd. As a result, it is possible to provide an image forming apparatus having a simple structure and capable of obtaining high-quality images regardless of the accuracy of parts.
【００４９】図５は本実施の形態の位置決め機構が組み
込まれた画像形成装置の全体構成の一例を示す側断面図
である。画像形成装置本体２１は、タンデム型カラー画
像形成装置と称されるもので、複数組の画像形成部２２
Ｙ，２２Ｍ，２２Ｃ，２２Ｋと、転写手段を構成するベ
ルト状の中間転写体２３と、給紙手段、定着手段の一例
としての定着装置２４とからなる。FIG. 5 is a side sectional view showing an example of the overall construction of an image forming apparatus incorporating the positioning mechanism of this embodiment. The image forming apparatus main body 21 is called a tandem type color image forming apparatus, and includes a plurality of sets of image forming units 22.
Each of Y, 22M, 22C, and 22K includes a belt-shaped intermediate transfer member 23 that constitutes a transfer unit, a sheet feeding unit, and a fixing device 24 as an example of a fixing unit.
【００５０】現像装置３は、各画像形成部２２Ｙ，２２
Ｍ，２２Ｃ，２２Ｋにそれぞれ組み込まれるものであ
り、イエロー色の画像を形成する画像形成部２２Ｙは、
感光ドラム１Ｙ、感光ドラム１Ｙを帯電させる帯電部２
５Ｙ、感光ドラム１Ｙを露光させる画像書き込み部２６
Ｙ、感光ドラム１Ｙにトナー像を形成する現像装置３
Ｙ、感光ドラム１Ｙを清掃するクリーニング部２７Ｙを
有する。The developing device 3 includes the image forming units 22Y and 22Y.
The image forming section 22Y, which is incorporated in each of the M, 22C, and 22K, forms the yellow image.
Photosensitive drum 1Y, charging unit 2 for charging the photosensitive drum 1Y
5Y, image writing unit 26 that exposes the photosensitive drum 1Y
Y, a developing device 3 for forming a toner image on the photosensitive drum 1Y
Y, a cleaning unit 27Y for cleaning the photosensitive drum 1Y.
【００５１】マゼンタ色の画像を形成する画像形成部２
２Ｍは、感光ドラム１Ｍ、感光ドラム１Ｍを帯電させる
帯電部２５Ｍ、感光ドラム１Ｍを露光させる画像書き込
み部２６Ｍ、感光ドラム１Ｍにトナー像を形成する現像
装置３Ｍ、感光ドラム１Ｍを清掃するクリーニング部２
７Ｍを有する。Image forming unit 2 for forming a magenta image
2M includes a photosensitive drum 1M, a charging unit 25M that charges the photosensitive drum 1M, an image writing unit 26M that exposes the photosensitive drum 1M, a developing device 3M that forms a toner image on the photosensitive drum 1M, and a cleaning unit 2 that cleans the photosensitive drum 1M.
With 7M.
【００５２】シアン色の画像を形成する画像形成部２２
Ｃは、感光ドラム１Ｃ、感光ドラム１Ｃを帯電させる帯
電部２５Ｃ、感光ドラム１Ｃを露光させる画像書き込み
部２６Ｃ、感光ドラム１Ｃにトナー像を形成する現像装
置３Ｃ、感光ドラム１Ｃを清掃するクリーニング部２７
Ｃを有する。Image forming section 22 for forming a cyan image
C is a photosensitive drum 1C, a charging unit 25C that charges the photosensitive drum 1C, an image writing unit 26C that exposes the photosensitive drum 1C, a developing device 3C that forms a toner image on the photosensitive drum 1C, and a cleaning unit 27 that cleans the photosensitive drum 1C.
Has C.
【００５３】黒色の画像を形成する画像形成部２２Ｋ
は、感光ドラム１Ｋ、感光ドラム１Ｋを帯電させる帯電
部２５Ｋ、感光ドラム１Ｋを露光させる画像書き込み部
２６Ｋ、感光ドラム１Ｋにトナー像を形成する現像装置
３Ｋ、感光ドラム１Ｋを清掃するクリーニング部２７Ｋ
を有する。Image forming unit 22K for forming a black image
Is a photosensitive drum 1K, a charging unit 25K that charges the photosensitive drum 1K, an image writing unit 26K that exposes the photosensitive drum 1K, a developing device 3K that forms a toner image on the photosensitive drum 1K, and a cleaning unit 27K that cleans the photosensitive drum 1K.
Have.
【００５４】画像形成部２２Ｙ，２２Ｍ，２２Ｃ，２２
Ｋにより形成された各色の画像は、回動する中間転写体
２３上に転写手段を構成する転写部２８Ｙ，２８Ｍ，２
８Ｃ，２８Ｋにより順次転写され（１次転写）、合成さ
れたカラー画像が形成される。給紙カセット２９内に収
容された用紙Ｐは、給紙手段を構成する繰り出しローラ
３０により給紙され、やはり給紙手段を構成する給紙ロ
ーラ群３１Ａ〜３１Ｄ、レジストローラ３２等を経て転
写手段を構成する転写部２８Ａに搬送され、中間転写体
２３に転写されたカラー画像が転写部２８Ａにより用紙
Ｐ上に転写される（２次転写）。カラー画像が転写され
た用紙Ｐは、定着装置２４により定着処理され、排紙ロ
ーラ３３に挟持されて、排紙トレー３４上に排出され
る。なお、３５Ｙ，３５Ｍ，３５Ｃ，３５Ｋは、現像装
置３Ｙ，３Ｍ，３Ｃ，３Ｋにそれぞれ新しいトナーを補
給するトナー補給部である。Image forming units 22Y, 22M, 22C, 22
The images of the respective colors formed by K are transferred onto the rotating intermediate transfer member 23 by transfer portions 28Y, 28M, 2 which constitute transfer means.
8C and 28K are sequentially transferred (primary transfer) to form a combined color image. The paper P accommodated in the paper feeding cassette 29 is fed by the feeding roller 30 which constitutes the paper feeding means, and also passes through the paper feeding roller groups 31A to 31D also constituting the paper feeding means, the registration rollers 32 and the like, and the transfer means. The color image transferred to the transfer unit 28A, which is included in the intermediate transfer member 23, is transferred onto the sheet P by the transfer unit 28A (secondary transfer). The sheet P on which the color image has been transferred is fixed by the fixing device 24, sandwiched by the sheet ejection rollers 33, and ejected onto the sheet ejection tray 34. Note that 35Y, 35M, 35C, and 35K are toner replenishing units that replenish the developing devices 3Y, 3M, 3C, and 3K with new toner.
【００５５】画像形成装置２１の上部には自動原稿送り
装置３６と原稿画像走査露光装置３７からなる画像読取
装置３８が設置されている。自動原稿送り装置３６の原
稿台上に載置された原稿ｄは搬送手段により搬送され、
原稿画像走査露光装置３７の光学系により原稿の片面ま
たは両面の画像が走査露光され、ラインイメージセンサ
ＣＣＤに読み込まれる。An image reading device 38 including an automatic document feeding device 36 and a document image scanning exposure device 37 is installed above the image forming device 21. The document d placed on the document table of the automatic document feeder 36 is transported by the transporting means,
An image on one side or both sides of the document is scanned and exposed by the optical system of the document image scanning exposure device 37, and is read by the line image sensor CCD.
【００５６】ラインイメージセンサＣＣＤにより光電変
換されたアナログ信号は、Ａ／Ｄ変換等の処理を行った
後、感光ドラム１Ｙ，１Ｍ，１Ｃ，１Ｋをそれぞれ露光
させる画像書き込み部６Ｙ，２６Ｍ，２６Ｃ，２６Ｋに
送られる。そして、感光ドラム１Ｙ，１Ｍ，１Ｃ，１Ｋ
を画像書き込み部２６Ｙ，２６Ｍ，２６Ｃ，２６Ｋで露
光し、帯電部２５Ｙ，２５Ｍ，２５Ｃ，２５Ｋで帯電す
ることで各感光ドラム１Ｙ，１Ｍ，１Ｃ，１Ｋに画像に
応じた静電潜像が形成される。この各感光ドラム１Ｙ，
１Ｍ，１Ｃ，１Ｋ上の静電潜像は、現像装置３Ｙ，３
Ｍ，３Ｃ，３Ｋによりトナー像となる。これにより、原
稿ｄの画像を用紙Ｐにコピーできるものである。The analog signal photoelectrically converted by the line image sensor CCD is subjected to A / D conversion and the like, and then image writing units 6Y, 26M, 26C, which expose the photosensitive drums 1Y, 1M, 1C, 1K, respectively. Sent to 26K. Then, the photosensitive drums 1Y, 1M, 1C, 1K
Is exposed by the image writing units 26Y, 26M, 26C and 26K and charged by the charging units 25Y, 25M, 25C and 25K to form electrostatic latent images corresponding to the images on the respective photosensitive drums 1Y, 1M, 1C and 1K. To be done. These photosensitive drums 1Y,
The electrostatic latent images on 1M, 1C and 1K are transferred to the developing devices 3Y and 3K.
A toner image is formed by M, 3C, and 3K. As a result, the image of the document d can be copied onto the paper P.
【００５７】そして、感光ドラム１Ｙ，１Ｍ，１Ｃ，１
Ｋにトナー像を形成するにあたり、本実施の形態の位置
決め機構を適用することで、感光ドラム１Ｙ，１Ｍ，１
Ｃ，１Ｋと、各現像装置３Ｙ，３Ｍ，３Ｃ，３Ｋの現像
スリーブ４Ｙ，４Ｍ，４Ｃ，４Ｋの間隔を所定の間隔
（Ｄｓｄ）に保つことができるので、良好なトナー像を
形成することができる。よって、高画質な画像を得るこ
とができる。Then, the photosensitive drums 1Y, 1M, 1C, 1
When the toner image is formed on K, by applying the positioning mechanism of the present embodiment, the photosensitive drums 1Y, 1M, 1
Since the distance between C and 1K and the developing sleeves 4Y, 4M, 4C and 4K of the developing devices 3Y, 3M, 3C and 3K can be maintained at a predetermined distance (Dsd), a good toner image can be formed. it can. Therefore, a high quality image can be obtained.
【００５８】なお、本実施の形態の画像形成装置は、カ
ラー画像形成装置に限るものでなく、現像装置３を１個
搭載する白黒の画像形成装置でもよい。また、本実施の
形態の位置決め機構は、画像形成装置に組み込むだけで
なく、対向する回転部材間の間隔を一定に保つことが必
要な各種装置に適用可能である。The image forming apparatus of the present embodiment is not limited to the color image forming apparatus, and may be a monochrome image forming apparatus having one developing device 3 mounted therein. Further, the positioning mechanism of the present embodiment can be applied not only to the image forming apparatus, but also to various apparatuses in which it is necessary to keep the interval between the rotating members facing each other constant.
【００５９】[0059]
【発明の効果】以上説明したように、本発明の位置決め
機構によれば、対向する回転部材間でそれぞれの軸を中
心とした円弧同士を常時接触させて、回転部材間の間隔
を形成する位置決め部材を設けたものである。これによ
り、対向する回転部材間の位置ずれ等は、一方の回転部
材の軸を中心とした回転動作となり、対向する回転部材
の間隔を一定に保つことができる。As described above, according to the positioning mechanism of the present invention, positioning is performed such that arcs centering on respective axes are always in contact between opposed rotating members to form a space between the rotating members. It is provided with a member. As a result, the positional deviation between the opposing rotary members results in a rotational operation centered on the axis of one rotary member, and the interval between the opposing rotary members can be kept constant.
【００６０】このような位置決め機構が組み込まれた画
像形成装置では、潜像担持体と現像スリーブの間隔を常
に一定に保つことができるので、潜像担持体に良好なト
ナー像を形成することができ、結果として、高画質な画
像が得られる。In the image forming apparatus incorporating such a positioning mechanism, the distance between the latent image carrier and the developing sleeve can be always kept constant, so that a good toner image can be formed on the latent image carrier. As a result, a high quality image can be obtained.
【図１】本発明の位置決め機構の実施の形態の一例を示
す斜視図である。FIG. 1 is a perspective view showing an example of an embodiment of a positioning mechanism of the present invention.
【図２】第１の位置決め部材の構成および取り付け状態
の詳細を示す説明図である。FIG. 2 is an explanatory diagram showing details of a configuration and an attached state of a first positioning member.
【図３】感光ドラム１と現像スリーブ４の位置関係を示
す側面図である。FIG. 3 is a side view showing a positional relationship between a photosensitive drum 1 and a developing sleeve 4.
【図４】本実施の形態の位置決め機構の動作を示す説明
図である。FIG. 4 is an explanatory diagram showing the operation of the positioning mechanism of the present embodiment.
【図５】画像形成装置の全体構成の一例を示す側断面図
である。FIG. 5 is a side sectional view showing an example of the overall configuration of the image forming apparatus.
【符号の説明】 １・・・感光ドラム １ａ・・・第１の軸 ２・・・軸受け ３・・・現像装置 ４・・・現像スリーブ ４ａ・・・第２の軸 ６・・・第１の位置決め部材 ６ａ・・・第１の突き当て面 ６ｂ・・・第２の突き当て面 ８・・・第２の位置決め部材 ８ａ・・・第１の突き当て面 ８ｂ・・・第２の突き当て面[Explanation of symbols] 1 ... Photosensitive drum 1a ... first axis 2 ... Bearing 3 ... Developer 4 ... Development sleeve 4a ... second axis 6 ... First positioning member 6a ... first abutting surface 6b ... second abutting surface 8 ... Second positioning member 8a ... first abutting surface 8b ... second abutting surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 徳武 直人 東京都八王子市石川町2970番地 コニカ株 式会社内 (72)発明者 川元 基史 東京都八王子市石川町2970番地 コニカ株 式会社内 Ｆターム(参考） 2H035 CA07 CB01 CD11 CD13 2H071 BA16 BA29 DA08 DA15 EA06 2H077 BA07 3J103 AA02 AA83 BA41 BA46 CA62 DA01 GA02 GA52 GA57 GA58 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Naoto Tokutake 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock Inside the company (72) Inventor Motoshi Kawamoto 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock Inside the company F term (reference) 2H035 CA07 CB01 CD11 CD13 2H071 BA16 BA29 DA08 DA15 EA06 2H077 BA07 3J103 AA02 AA83 BA41 BA46 CA62 DA01 GA02 GA52 GA57 GA58
Claims (10)
材と、前記第１の軸と平行な第２の軸を中心に回転する
第２の回転部材とを備え、前記第１の回転部材と前記第
２の回転部材を所定の間隔を開けて対向させる位置決め
機構において、 前記第１の軸を中心とした円の少なくとも一部からなる
突き当て面を備えた第１の位置決め部材と、 前記第２の軸を中心とした円の少なくとも一部からなる
突き当て面を備えた第２の位置決め部材とを備え、 前記第１の位置決め部材は、前記突き当て面を前記第１
の軸と前記第２の軸とを結ぶ法線方向に向けて、前記第
１の回転部材の軸方向の両側に設けられるとともに、 前記第２の位置決め部材は、前記突き当て面を前記第１
の軸と前記第２の軸とを結ぶ法線方向に向けて、前記第
２の回転部材の軸方向の両側で、かつ前記第１の位置決
め部材と対向する位置に設けられ、 前記第１の位置決め部材の突き当て面と前記第２の位置
決め部材の突き当て面を、前記第１の軸と前記第２の軸
とを結ぶ線の方向に押し付けるような方向の成分を持つ
力で押し付ける押圧手段を設けたことを特徴とする位置
決め機構。1. A first rotating member that rotates about a first axis, and a second rotating member that rotates about a second axis parallel to the first axis. A positioning mechanism in which the rotating member and the second rotating member are opposed to each other at a predetermined interval, the first positioning member having an abutting surface formed of at least a part of a circle centered on the first axis. And a second positioning member having an abutting surface formed of at least a part of a circle centered on the second axis, wherein the first positioning member has the abutting surface as the first abutting surface.
Is provided on both sides in the axial direction of the first rotating member in a direction normal to the axis connecting the first axis and the second axis, and the second positioning member has the abutting surface in the first direction.
Is provided on both sides in the axial direction of the second rotating member and in a position facing the first positioning member, in a direction normal to the axis connecting the first axis and the second axis, A pressing unit that presses the abutting surface of the positioning member and the abutting surface of the second positioning member with a force having a component that presses the abutting surface of the second positioning member in the direction of the line connecting the first axis and the second axis. A positioning mechanism characterized by being provided.
て面として、中心が一致しかつ径の異なるそれぞれの円
の少なくとも一部からなる第１および第２の突き当て面
を、少なくとも前記第１の軸と前記第２の軸とを結ぶ法
線に沿って備え、その内周側となる前記第２の突き当て
面の径を、前記第１の軸を中心とした円周面からなる第
１の支持部の径と一致させたものであるとともに、 前記第２の位置決め部材は、前記突き当て面として、中
心が一致しかつ径の異なるそれぞれの円の少なくとも一
部からなる第１および第２の突き当て面を、少なくとも
前記第１の軸と前記第２の軸とを結ぶ法線に沿って備
え、その内周側となる前記第２の突き当て面の径を、前
記第２の軸を中心とした円周面からなる第２の支持部の
径と一致させたものであり、 前記第１の位置決め部材は、その内周側となる第２の突
き当て面を前記第１の支持部に当接させて取り付けられ
るとともに、 前記第２の位置決め部材は、その内周側となる第２の突
き当て面を前記第２の支持部に当接させて取り付けられ
ることを特徴とする請求項１記載の位置決め機構。2. The first positioning member includes, as the abutting surface, at least a first and a second abutting surface formed of at least a part of respective circles having the same center and different diameters. The diameter of the second butting surface, which is provided along the normal line connecting the first axis and the second axis and is on the inner peripheral side thereof, is a circumferential surface centered on the first axis. The second positioning member has a diameter that matches the diameter of the first support portion, and the second positioning member includes, as the abutting surface, at least a part of respective circles having the same center and different diameters. A second abutting surface is provided along at least a normal line connecting the first axis and the second axis, and a diameter of the second abutting surface on an inner peripheral side thereof is defined as the second abutting surface. The diameter of the second support portion formed of a circumferential surface centering on the axis of The first positioning member is attached such that the second butting surface, which is the inner peripheral side of the first positioning member, abuts on the first support portion, and the second positioning member is the inner peripheral side thereof. The positioning mechanism according to claim 1, wherein the second abutting surface is attached to the second supporting portion so as to abut against the second supporting portion.
び第２の突き当て面は円の一部からなる円弧形状で、 前記第１の位置決め部材は、前記第１の軸を支持する軸
受けを前記第１の支持部として、前記第２の突き当て面
を前記軸受けの外周面に当接させて取り付けられること
を特徴とする請求項２記載の位置決め機構。3. The first and second abutting surfaces of the first positioning member have an arc shape formed by a part of a circle, and the first positioning member has a bearing that supports the first shaft. 3. The positioning mechanism according to claim 2, wherein the second abutment surface is attached to the outer peripheral surface of the bearing by using as a first support portion.
び第２の突き当て面は円周面で、 前記第２の位置決め部材は、前記第２の軸を前記支持部
として、この第２の軸に回転可能に取り付けられること
を特徴とする請求項２または３記載の位置決め機構。4. The first and second abutting surfaces of the second positioning member are circumferential surfaces, and the second positioning member uses the second shaft as the support portion. The positioning mechanism according to claim 2 or 3, wherein the positioning mechanism is rotatably attached to the shaft.
決め部材の第１の突き当て面までの距離と、前記第２の
軸の中心から前記第２の位置決め部材の第１の突き当て
面までの距離の合計を、前記第１の回転部材の半径と、
前記第２の回転部材の半径と、前記第１の回転部材と前
記第２の回転部材の間隔の合計と等しくしたことを特徴
とする請求項２、３または４記載の位置決め機構。5. The distance from the center of the first shaft to the first butting surface of the first positioning member, and the first protrusion of the second positioning member from the center of the second shaft. The sum of the distances to the contact surfaces is the radius of the first rotating member,
The positioning mechanism according to claim 2, 3 or 4, wherein the radius of the second rotating member is equal to the sum of the intervals between the first rotating member and the second rotating member.
持体に、第２の軸を中心とした円筒形状の現像スリーブ
を対向配置して、前記現像スリーブにより前記潜像担持
体にトナー像を形成する画像形成装置において、 前記潜像担持体と前記現像スリーブを所定の間隔を開け
て対向させる位置決め機構として、 前記第１の軸を中心とした円の少なくとも一部からなる
突き当て面を備えた第１の位置決め部材と、 前記第２の軸を中心とした円の少なくとも一部からなる
突き当て面を備えた第２の位置決め部材とを備え、 前記第１の位置決め部材は、前記突き当て面を前記第１
の軸と前記第２の軸とを結ぶ法線方向に向けて、前記潜
像担持体の軸方向の両側に設けられるとともに、 前記第２の位置決め部材は、前記突き当て面を前記第１
の軸と前記第２の軸とを結ぶ法線方向に向けて、前記現
像スリーブの軸方向の両側で、かつ前記第１の位置決め
部材と対向する位置に設けられ、 前記第１の位置決め部材の突き当て面と前記第２の位置
決め部材の突き当て面を、前記第１の軸と前記第２の軸
とを結ぶ線の方向に押し付けるような方向の成分を持つ
力で押し付ける押圧手段を設けたことを特徴とする画像
形成装置。6. A latent image carrier having a cylindrical shape centered on a first axis, and a developing sleeve having a cylindrical shape centered on a second axis is arranged to face the latent image carrier. In an image forming apparatus for forming a toner image on a sheet, as a positioning mechanism that makes the latent image carrier and the developing sleeve face each other with a predetermined gap, a protrusion formed of at least a part of a circle centered on the first axis. A first positioning member having a contact surface, and a second positioning member having an abutment surface formed of at least a part of a circle centered on the second axis, wherein the first positioning member is , The abutting surface is the first
Is provided on both sides in the axial direction of the latent image carrier in a direction normal to the axis connecting the first axis and the second axis, and the second positioning member has the abutting surface with the first surface.
Is provided on both sides in the axial direction of the developing sleeve in a direction normal to the axis connecting the first positioning member and the second positioning shaft, and at a position facing the first positioning member. The pressing means is provided for pressing the abutting surface and the abutting surface of the second positioning member in a direction of a line connecting the first axis and the second axis with a component having a direction component. An image forming apparatus characterized by the above.
て面として、中心が一致しかつ径の異なるそれぞれの円
の少なくとも一部からなる第１および第２の突き当て面
を、少なくとも前記第１の軸と前記第２の軸とを結ぶ法
線に沿って備え、その内周側となる前記第２の突き当て
面の径を、前記第１の軸を中心とした円周面からなる第
１の支持部の径と一致させたものであるとともに、 前記第２の位置決め部材は、前記突き当て面として、中
心が一致しかつ径の異なるそれぞれの円の少なくとも一
部からなる第１および第２の突き当て面を、少なくとも
前記第１の軸と前記第２の軸とを結ぶ法線に沿って備
え、その内周側となる前記第２の突き当て面の径を、前
記第２の軸を中心とした円周面からなる第２の支持部の
径と一致させたものであり、 前記第１の位置決め部材は、その内周側となる第２の突
き当て面を前記第１の支持部に当接させて取り付けられ
るとともに、 前記第２の位置決め部材は、その内周側となる第２の突
き当て面を前記第２の支持部に当接させて取り付けられ
ることを特徴とする請求項６記載の画像形成装置。7. The first positioning member includes, as the abutting surface, at least a first abutting surface and a second abutting surface formed of at least a part of respective circles having the same center and different diameters. The diameter of the second butting surface, which is provided along the normal line connecting the first axis and the second axis and is on the inner peripheral side thereof, is a circumferential surface centered on the first axis. The second positioning member has a diameter that matches the diameter of the first support portion, and the second positioning member includes, as the abutting surface, at least a part of respective circles having the same center and different diameters. A second abutting surface is provided along at least a normal line connecting the first axis and the second axis, and a diameter of the second abutting surface on an inner peripheral side thereof is defined as the second abutting surface. The diameter of the second support portion formed of a circumferential surface centering on the axis of The first positioning member is attached such that the second butting surface, which is the inner peripheral side of the first positioning member, abuts on the first support portion, and the second positioning member is the inner peripheral side thereof. The image forming apparatus according to claim 6, wherein the second abutting surface is attached to the second supporting portion so as to abut against the second supporting portion.
び第２の突き当て面は円の一部からなる円弧形状で、 前記第１の位置決め部材は、前記第１の軸を支持する軸
受けを前記第１の支持部として、前記第２の突き当て面
を前記軸受けの外周面に当接させて取り付けられること
を特徴とする請求項７記載の画像形成装置。8. The first and second abutting surfaces of the first positioning member have an arc shape formed of a part of a circle, and the first positioning member has a bearing that supports the first shaft. The image forming apparatus according to claim 7, wherein the second abutting surface is attached to the outer peripheral surface of the bearing by using the as a first supporting portion.
び第２の突き当て面は円周面で、 前記第２の位置決め部材は、前記第２の軸を前記支持部
として、この第２の軸に回転可能に取り付けられること
を特徴とする請求項７または８記載の画像形成装置。9. The first and second abutting surfaces of the second positioning member are circumferential surfaces, and the second positioning member uses the second shaft as the support portion. 9. The image forming apparatus according to claim 7, wherein the image forming apparatus is rotatably attached to the shaft.
置決め部材の第１の突き当て面までの距離と、前記第２
の軸の中心から前記第２の位置決め部材の第１の突き当
て面までの距離の合計を、前記潜像担持体の半径と、前
記現像スリーブの半径と、前記潜像担持体と前記現像ス
リーブの間隔の合計と等しくしたことを特徴とする請求
項７、８または９記載の画像形成装置。10. The distance from the center of the first shaft to the first butting surface of the first positioning member, and the second
The total distance from the center of the axis of the second positioning member to the first butting surface of the second positioning member, the radius of the latent image carrier, the radius of the developing sleeve, the latent image carrier and the developing sleeve. 10. The image forming apparatus according to claim 7, 8 or 9, wherein the distance is equal to the total of the intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001220493A JP2003028142A (en) | 2001-07-19 | 2001-07-19 | Positioning mechanism and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001220493A JP2003028142A (en) | 2001-07-19 | 2001-07-19 | Positioning mechanism and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003028142A true JP2003028142A (en) | 2003-01-29 |
Family
ID=19054305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001220493A Pending JP2003028142A (en) | 2001-07-19 | 2001-07-19 | Positioning mechanism and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003028142A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037889A (en) * | 2003-07-14 | 2005-02-10 | Samsung Electronics Co Ltd | Developing device |
| JP2006243180A (en) * | 2005-03-01 | 2006-09-14 | Matsushita Electric Ind Co Ltd | Positioning mechanism for photoreceptor and developing roller and image forming apparatus equipped therewith |
| KR20110036392A (en) * | 2009-10-01 | 2011-04-07 | 삼성전자주식회사 | Electrophotographic image forming apparatus |
| JP2012032478A (en) * | 2010-07-29 | 2012-02-16 | Konica Minolta Business Technologies Inc | Image forming device, developing device, imaging unit |
| US9287152B2 (en) | 2009-12-10 | 2016-03-15 | Orbotech LT Solar, LLC. | Auto-sequencing multi-directional inline processing method |
| US9462921B2 (en) | 2011-05-24 | 2016-10-11 | Orbotech LT Solar, LLC. | Broken wafer recovery system |
-
2001
- 2001-07-19 JP JP2001220493A patent/JP2003028142A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005037889A (en) * | 2003-07-14 | 2005-02-10 | Samsung Electronics Co Ltd | Developing device |
| JP2006243180A (en) * | 2005-03-01 | 2006-09-14 | Matsushita Electric Ind Co Ltd | Positioning mechanism for photoreceptor and developing roller and image forming apparatus equipped therewith |
| KR20110036392A (en) * | 2009-10-01 | 2011-04-07 | 삼성전자주식회사 | Electrophotographic image forming apparatus |
| KR101644639B1 (en) * | 2009-10-01 | 2016-08-11 | 삼성전자 주식회사 | Electrophotographic image forming apparatus |
| US9287152B2 (en) | 2009-12-10 | 2016-03-15 | Orbotech LT Solar, LLC. | Auto-sequencing multi-directional inline processing method |
| JP2012032478A (en) * | 2010-07-29 | 2012-02-16 | Konica Minolta Business Technologies Inc | Image forming device, developing device, imaging unit |
| US9462921B2 (en) | 2011-05-24 | 2016-10-11 | Orbotech LT Solar, LLC. | Broken wafer recovery system |
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