JPS63208883A - Image carrying body unit - Google Patents
Image carrying body unitInfo
- Publication number
- JPS63208883A JPS63208883A JP62042310A JP4231087A JPS63208883A JP S63208883 A JPS63208883 A JP S63208883A JP 62042310 A JP62042310 A JP 62042310A JP 4231087 A JP4231087 A JP 4231087A JP S63208883 A JPS63208883 A JP S63208883A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- developing unit
- drum
- unit
- developing sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
イ１発明の目的
〔産業上の利用分野〕
本発明は、感光体ドラムと現像スリーブを、現像スリー
ブの両端部で間隔保持部材を介して２点でち接させた電
子写真を用いた画像形成装置の画像相持体ユニットに関
する。[Detailed Description of the Invention] A1 Object of the Invention [Field of Industrial Application] The present invention provides a structure in which a photosensitive drum and a developing sleeve are brought into contact with each other at two points at both ends of the developing sleeve via a spacing member. The present invention relates to an image carrier unit of an image forming apparatus using electrophotography.
従来この種の画像担持体ユニットでは、画像担持体ユニ
ット容器１５に現像ユニット２が２点で支持されていた
。そして感光体ドラム５と現像スリーブ４をその両端部
で計２個の間隔保持部材７・８を介して当接させるので
、計４点支持構成となる。Conventionally, in this type of image carrier unit, the developing unit 2 was supported by the image carrier unit container 15 at two points. Since the photosensitive drum 5 and the developing sleeve 4 are brought into contact with each other at both ends thereof via a total of two spacing members 7 and 8, a total of four points of support is provided.
従って現像スリーブ４を感光体ドラム５に対して確実に
２点支持することが困難であった。Therefore, it has been difficult to reliably support the developing sleeve 4 with respect to the photosensitive drum 5 at two points.
さらに、現像スリーブ４を駆動した場合に発生する回転
トルクが現像スリーブ４の駆動側だけに加わるため、現
像スリーブ４を駆動状態で感光体ドラム５に常時一定な
圧力で２点接触させることが困難であった・
本発明はこれ等の問題点を解決した画像担持体ユニット
を提供することを目的とする。Furthermore, since the rotational torque generated when the developing sleeve 4 is driven is applied only to the driving side of the developing sleeve 4, it is difficult to bring the developing sleeve 4 into contact with the photoreceptor drum 5 at two points with constant pressure at all times while the developing sleeve 4 is being driven. It is an object of the present invention to provide an image carrier unit that solves these problems.
口、発明の構成
〔問題点を解決するための手段〕
本発明は、現像ユニット２の両端部に設けた間隔保持部
材７・８を画像形成ドラム５に当接させて現像ユニット
２を感光体ドラム５に対して位置決めする画像形成装置
の画像担持体ユニー、トにおいて、現像スリーブ４端部
の駆動ギア１７のピッチ点１３を通った噛み合い圧力角
方向と平行な直線６上において、現像ユニット２をドラ
ム５の放射方向に傾動自在に支持し、その傾動軸線６上
の現像ユニット２の重心に最も近い場所に、現像ユニッ
ト２を前記の噛み合い圧力角方向の周りに回転自在に支
持する軸３を設けて、現像ユニットに２つの回動自由度
を持たせ、現像ユニー、トを感光体ドラム５の方へ傾動
するように押圧する部材１８を現像ユニットのドラム軸
線方向の両端部に設けたことを特徴とした画像担持体ユ
ニットである。Summary, Structure of the Invention [Means for Solving the Problems] The present invention allows the developing unit 2 to be connected to the photoreceptor by bringing the spacing members 7 and 8 provided at both ends of the developing unit 2 into contact with the image forming drum 5. In the image bearing unit of the image forming apparatus, which is positioned relative to the drum 5, the developing unit 2 is positioned on a straight line 6 parallel to the meshing pressure angle direction passing through the pitch point 13 of the drive gear 17 at the end of the developing sleeve 4. A shaft 3 that supports the drum 5 so as to be tiltable in the radial direction of the drum 5, and a shaft 3 that supports the developing unit 2 rotatably around the engagement pressure angle direction at a position on the tilting axis 6 closest to the center of gravity of the developing unit 2. The developing unit is provided with two rotational degrees of freedom, and members 18 for pressing the developing unit so as to tilt the developing unit toward the photosensitive drum 5 are provided at both ends of the developing unit in the drum axis direction. This is an image carrier unit characterized by the following.
現像スリーブ４端部の駆動ギア１７のピッチ点１３を通
った噛み合い圧力角方向と平行な直線６Ｈにおいて、現
像ユニット２をドラム５の放射方向に傾動自在に支持た
第１の自由度と、その傾動軸線６上の現像ユニット２の
重心に最も近い場所に、現像ユニット２を前記の噛み合
い圧力角方向の周りに回転自在に支持する第２の自由度
を与えたことによって、実質的に現像ユニットを１点支
持構成とし、現像スリーブの両端部の感光体ドラムに対
する２個の間隔保持部材とによって、現像ユニットの３
点支持となり、現像スリーブはドラムに確実に２点で接
触し、前記の問題点が解決される。A first degree of freedom in which the developing unit 2 is supported so as to be tiltable in the radial direction of the drum 5, and By providing a second degree of freedom for rotatably supporting the developing unit 2 around the engagement pressure angle direction at the location closest to the center of gravity of the developing unit 2 on the tilting axis 6, the developing unit is substantially The developing sleeve has a one-point support structure, and two spacing members for the photosensitive drum at both ends of the developing sleeve support the three-point support structure of the developing unit.
With point support, the developing sleeve reliably contacts the drum at two points, and the above-mentioned problem is solved.
図面は１本発明を示すもので、先ず第１図・第２図の実
施例について説明する。１は、画像担持体ユニット容器
１５にその両端を支持された現像器支持棒、２は現像ユ
ニット、３は現像器支持棒ｌに現像ユニット２をその重
心に最も近い位置で回転可能に結合するビスで後記の直
線６と平行線方向である。４は現像スリーブ、５は感光
体ドラム、６は現像スリーブを駆動するギア１７のピッ
チ点１３を通り、そのかみ合い圧力角方向へ引いた直線
、７・８は現像スリーブ４の両端部に位置し感光体ドラ
ム５と現像スリーブ４を一定の間隔で保持する一対の間
隔保持部材、９は現像スリーブ４の回転方向、１０は感
光体ドラム５の回転方向、１１はビス３を中心とした現
像ユニット２の回転可能方向、１２は現像器支持棒１の
回転可能方向、１８は現像スリーブ４を感光体ドラム５
に圧接させるための押圧用バネである。The drawings illustrate the present invention, and first, the embodiments shown in FIGS. 1 and 2 will be described. Reference numeral 1 denotes a developer support rod whose both ends are supported by the image carrier unit container 15, 2 a developing unit, and 3 rotatably connects the developer unit 2 to the developer support rod l at a position closest to its center of gravity. The direction of the screw is parallel to the straight line 6 described later. 4 is a developing sleeve, 5 is a photosensitive drum, 6 is a straight line passing through the pitch point 13 of the gear 17 that drives the developing sleeve and drawn in the direction of the engagement pressure angle, and 7 and 8 are located at both ends of the developing sleeve 4. A pair of spacing members that hold the photoreceptor drum 5 and the developing sleeve 4 at a constant interval; 9 is the rotational direction of the developing sleeve 4; 10 is the rotational direction of the photoreceptor drum 5; 11 is a developing unit centered around the screw 3. 2 is a rotatable direction, 12 is a rotatable direction of the developing device support rod 1, and 18 is a rotatable direction of the developing sleeve 4.
This is a pressing spring for pressing the
（ａ）上記構成によって、現像ユニット２には２つの自
由度が与えられる。第１の自由度は現像スリーブ４の軸
が、感光体ドラムの軸と平行状態を保ったまま、１つの
軸ｌ（支持棒）を中心として矢示１２の方向に回転運動
すること、第２の自由度は、現像スリーブが駆動を受け
るギア１７のピッチ点１３を通り、そのかみ合い圧力角
方向へ引いた線と平行な直線６上の、ビス３を軸として
矢示１１の方向に回転連動すること、これにより実質的
には一点支持と同じ効果を得る。したがって、現像スリ
ーブ４を間隔保持部材７拳８を挟み感光体ドラム５に対
し２点で支持すると、計３点支持となるため、現像スリ
ーブ４は確実に感光体ドラム５に２点支持される。(a) The above configuration gives the developing unit 2 two degrees of freedom. The first degree of freedom is that the axis of the developing sleeve 4 rotates in the direction of arrow 12 around one axis l (support rod) while remaining parallel to the axis of the photoreceptor drum; The degree of freedom is that the developing sleeve passes through the pitch point 13 of the gear 17 that is driven and rotates in the direction of arrow 11 about the screw 3 on the straight line 6 parallel to the line drawn in the direction of the engagement pressure angle. This essentially achieves the same effect as single-point support. Therefore, if the developing sleeve 4 is supported at two points relative to the photoreceptor drum 5 with the spacing member 7 fist 8 in between, it will be supported at three points in total, so the developing sleeve 4 will be reliably supported at two points on the photoreceptor drum 5. .
（ｂ）また、第１の自由度の軸１は、現像スリーブ４が
駆動を受けるギア１７のピッチ点１３を通り、そのかみ
合い圧力角方向へ引いた直線と平行な線６上にあって、
感光体ドラム軸と平行に配置されている為、現像スリー
ブ４の駆動・静止の状態にかかわらず回転トルクの影響
を受けず、常時一定な圧力で現像スリーブ４を感光体ド
ラム５に２点支持することができる。(b) Also, the axis 1 of the first degree of freedom is on a line 6 that passes through the pitch point 13 of the gear 17 on which the developing sleeve 4 is driven and is parallel to a straight line drawn in the direction of the meshing pressure angle,
Because it is arranged parallel to the photoreceptor drum axis, the developing sleeve 4 is supported at two points on the photoreceptor drum 5 with constant pressure, regardless of whether the developing sleeve 4 is driven or stationary, and is not affected by rotational torque. can do.
（Ｃ）また第２の自由度の軸３は、その位置を現像ユニ
ット２の用心位置に最も近く設置されており、これによ
り間隔保持部材７・８を介して当接した感光体ドラム５
と現像スリーブ２の圧接力は、現像ユニット２の自重の
当接方向成分とバネ１８の張力のみとなる。この時現像
ユニット２の自重の当接方向成分の２分の１が間隔保持
部材７・８の各々に加わるため、現像ユニット２の両端
部に掛けられたバネ１８を両端で共通部品にした時、感
光体ドラム５と現像スリーブ２の圧接力は、接触した２
点において、等しく加わる。(C) The shaft 3 having the second degree of freedom is installed with its position closest to the guard position of the developing unit 2, so that the photoreceptor drum 5 is brought into contact with it via the spacing members 7 and 8.
The pressing force of the developing sleeve 2 is only the component of the weight of the developing unit 2 in the contact direction and the tension of the spring 18. At this time, half of the weight of the developing unit 2 in the contact direction is applied to each of the spacing members 7 and 8, so when the springs 18 hung on both ends of the developing unit 2 are made a common part at both ends. , the pressure contact force between the photosensitive drum 5 and the developing sleeve 2 is
Add equally at the points.
第３図は本発明の他の実施例を示すもので、現像器支持
棒１と、現像ユニット２を、第１図例のビス３により連
結部材１４を介して結合したものである。この結合部材
１４即ち現像ユニット２は、現像器支持棒１の円周を矢
示方向１２ａに回動できるが、軸方向には移動しないよ
うに固定されている。FIG. 3 shows another embodiment of the present invention, in which a developing device support rod 1 and a developing unit 2 are connected via a connecting member 14 using the screw 3 of the example shown in FIG. The connecting member 14, that is, the developing unit 2 can rotate around the circumference of the developing device support rod 1 in the direction of the arrow 12a, but is fixed so as not to move in the axial direction.
これにより前例と同様の作用効果を有する他、現像器支
持棒１自体の第２図矢示方向１２の回動運動を必要とし
ないため、その両端の画像担持体ユニット容器１５への
取付は構成が簡単になる。In addition to having the same effect as the previous example, this does not require rotational movement of the developing device support rod 1 itself in the direction 12 shown by the arrow in FIG. becomes easier.
第４図は本発明のさらに他の実施例を示すもので、前記
二個と異なり現像器支持棒ｌを省き、現像器支持棒ｌの
第２図示回転方向１２の自由度の代用として、現像ユニ
ット２と画像担持体ユニット容器１５を、第２図例と同
様にビス３の位置で両者２拳１５の間にギャップ１６を
設けたものである。FIG. 4 shows still another embodiment of the present invention, in which the developing device support rod l is omitted unlike the above two, and as a substitute for the degree of freedom of the developing device support rod l in the second illustrated rotational direction 12, the developing device support rod l is A gap 16 is provided between the unit 2 and the image carrier unit container 15 at the position of the screw 3, as in the example shown in FIG.
その構成により間隔保持部材７０８と感光体ドラム５が
当接する領域では、現像器支持棒ｌが存在した場合と同
じ効果が得られ、部品点数が少なく、工数が少なくなる
。With this configuration, in the area where the spacing member 708 and the photosensitive drum 5 come into contact, the same effect as when the developing device support rod 1 is present can be obtained, and the number of parts and man-hours are reduced.
ハ１発明の詳細
な説明したように、現像スリーブ４を保持している現像
ユニット２が、その容器１５に第１−第２の２つの自由
度をもって実質的に１点支持され、現像スリーブ４と感
光体ドラム５の２点支持と合せて計３点支持することに
より、現像スリーブ４と感光体ドラム５が確実に２点で
接触する。C1 As described in detail of the invention, the developing unit 2 holding the developing sleeve 4 is substantially supported at one point by the container 15 with two degrees of freedom, the first and second degrees of freedom, and the developing sleeve 4 is By supporting the developing sleeve 4 and the photoreceptor drum 5 at two points in total by supporting them at three points, the developing sleeve 4 and the photoreceptor drum 5 are reliably contacted at two points.
従って現像スリーブ４の駆動・静ＩＥ状態にかかわらず
、その回転トルクが現像スリーブ４と感光体ドラム５の
当接力に影響を及ぼすことがなく当接する２点が常時一
定の圧力で当接することが可能である。Therefore, regardless of the driving or static IE state of the developing sleeve 4, its rotational torque will not affect the contact force between the developing sleeve 4 and the photosensitive drum 5, and the two points of contact will always be in contact with a constant pressure. It is possible.
また間隔保持部材７・８を介して当接した感光体ドラム
５と、現像スリーブ２の押圧力は、現像ユニット２の自
重の当接方向成分とバネ１８の張力のみとなる。この時
現像ユニット２の自重の当接方向成分の２分の１が間隔
保持部材７＠８の各々に加わるため、現像ユニット２の
両端部に掛けられたバネ１８を両端で共通部品にすれば
感光体ドラム５と、現像スリーブ２の押圧力は、接触し
た２点において等しく加わる。Further, the pressing force between the photosensitive drum 5 and the developing sleeve 2, which are in contact with each other via the spacing members 7 and 8, is only the component of the weight of the developing unit 2 in the contact direction and the tension of the spring 18. At this time, half of the weight of the developing unit 2 in the contact direction is applied to each of the spacing members 7@8, so if the springs 18 hung on both ends of the developing unit 2 are made a common part at both ends. The pressing force between the photosensitive drum 5 and the developing sleeve 2 is equally applied at the two points of contact.
【図面の簡単な説明】
第１図は本発明画像担持体ユニットの横断面図、第２図
はその現像ユニットの設置状態を示す斜視図、第３図・
第４図は本発明の他の実施例の横断面図である。
１は現像器支持棒（第１自由度の軸）、２は現像ユニッ
ト、３はビス（第２自由度の軸）、４は現像スリーブ、
５は感光体ドラム、６は現像スリーブ駆動ギア１７の圧
力角方向と平行な線、７０８は間隔保持部材（スペーサ
コロ）、９は現像スリーブの回転方向、１０は感光体ド
ラムの回転方向、１１は現像ユニットの回転可能方向、
１２は現像器支持棒の回転可能方向、１３は駆動ギア１
７のピッチ点、１４は連結部材、１５は画像担持体ユニ
ット容器、１６は模擬的に上記回転方向１２の働きをす
るギャップ、１８は抑圧部材（バネ）。
第３図
第４図
第１図[Brief Description of the Drawings] Fig. 1 is a cross-sectional view of the image carrier unit of the present invention, Fig. 2 is a perspective view showing the installed state of the developing unit, and Fig. 3.
FIG. 4 is a cross-sectional view of another embodiment of the invention. 1 is a developing device support rod (axis of first degree of freedom), 2 is a developing unit, 3 is a screw (axis of second degree of freedom), 4 is a developing sleeve,
5 is a photoconductor drum, 6 is a line parallel to the pressure angle direction of the developing sleeve drive gear 17, 708 is a spacing member (spacer roller), 9 is a rotation direction of the development sleeve, 10 is a rotation direction of the photoconductor drum, 11 is a line parallel to the pressure angle direction of the developing sleeve drive gear 17 The direction in which the developing unit can rotate,
12 is the rotatable direction of the developing device support rod; 13 is the drive gear 1;
7 is a pitch point, 14 is a connecting member, 15 is an image carrier unit container, 16 is a gap that simulates the rotation direction 12, and 18 is a suppressing member (spring). Figure 3 Figure 4 Figure 1
Claims (1)
像形成ドラムに当接させて現像ユニットを感光体ドラム
に対して位置決めする画像形成装置の画像担持体ユニッ
トにおいて、 現像スリーブ端部の駆動ギアのピッチ点を通った噛み合
い圧力角方向と平行な直線上において、現像ユニットを
ドラムの放射方向に傾動自在に支持し、 その傾動軸線上の現像ユニットの重心に最も近い場所に
、現像ユニットを前記の噛み合い圧力角方向の周りに回
転自在に支持する軸を設けて、現像ユニットに２つの回
動自由度を持たせ、 現像ユニットを感光体ドラムの方へ傾動するように押圧
する部材を現像ユニットのドラム軸線方向の両端部に設
けたことを特徴とした画像担持体ユニット。(1) In an image carrier unit of an image forming apparatus in which the developing unit is positioned with respect to the photosensitive drum by bringing spacing members provided at both ends of the developing unit into contact with the image forming drum, driving the end of the developing sleeve. The developing unit is supported so as to be tiltable in the radial direction of the drum on a straight line passing through the pitch point of the gear and parallel to the meshing pressure angle direction, and the developing unit is positioned closest to the center of gravity of the developing unit on the tilting axis. A shaft that is rotatably supported around the meshing pressure angle direction is provided to give the developing unit two degrees of rotational freedom, and a member that presses the developing unit to tilt it toward the photoreceptor drum is used as a developing member. An image carrier unit characterized by being provided at both ends of the unit in the drum axis direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62042310A JPS63208883A (en) | 1987-02-25 | 1987-02-25 | Image carrying body unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62042310A JPS63208883A (en) | 1987-02-25 | 1987-02-25 | Image carrying body unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63208883A true JPS63208883A (en) | 1988-08-30 |
Family
ID=12632450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62042310A Pending JPS63208883A (en) | 1987-02-25 | 1987-02-25 | Image carrying body unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63208883A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001154565A (en) * | 1999-11-26 | 2001-06-08 | Kyocera Corp | Process unit |
| JP2009145467A (en) * | 2007-12-12 | 2009-07-02 | Ricoh Co Ltd | Imaging unit and image forming apparatus |
| JP2009237106A (en) * | 2008-03-26 | 2009-10-15 | Ricoh Co Ltd | Pressing mechanism, transfer device, and image forming apparatus |
| JP2013200552A (en) * | 2012-02-22 | 2013-10-03 | Ricoh Co Ltd | Process unit and image forming apparatus |
| JP2017198964A (en) * | 2016-04-20 | 2017-11-02 | 富士ゼロックス株式会社 | Image forming apparatus and image forming unit |
-
1987
- 1987-02-25 JP JP62042310A patent/JPS63208883A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001154565A (en) * | 1999-11-26 | 2001-06-08 | Kyocera Corp | Process unit |
| JP2009145467A (en) * | 2007-12-12 | 2009-07-02 | Ricoh Co Ltd | Imaging unit and image forming apparatus |
| JP2009237106A (en) * | 2008-03-26 | 2009-10-15 | Ricoh Co Ltd | Pressing mechanism, transfer device, and image forming apparatus |
| US8515310B2 (en) | 2008-03-26 | 2013-08-20 | Ricoh Company, Limited | Pressing mechanism, transfer device, and image forming apparatus |
| JP2013200552A (en) * | 2012-02-22 | 2013-10-03 | Ricoh Co Ltd | Process unit and image forming apparatus |
| JP2017198964A (en) * | 2016-04-20 | 2017-11-02 | 富士ゼロックス株式会社 | Image forming apparatus and image forming unit |
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