JP2005070676A - Image density detecting device for intermediate transfer device - Google Patents

Image density detecting device for intermediate transfer device Download PDF

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JP2005070676A
JP2005070676A JP2003303515A JP2003303515A JP2005070676A JP 2005070676 A JP2005070676 A JP 2005070676A JP 2003303515 A JP2003303515 A JP 2003303515A JP 2003303515 A JP2003303515 A JP 2003303515A JP 2005070676 A JP2005070676 A JP 2005070676A
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image
intermediate transfer
transfer device
image density
recording medium
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JP4312547B2 (en
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Seiji Furuya
政治 古屋
Yoshiyuki Kimura
祥之 木村
Ryuta Takechi
隆太 武市
Hiroyuki Saito
大享 斎藤
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent soiling of the detection surface of an image density detecting device, using simple constitution for detecting a density detection pattern formed on an intermediate transfer belt. <P>SOLUTION: In the intermediate transfer device, toner images formed on photoreceptors 1Y, 1C, 1M and 1K rotating clockwise are successively superposed and transferred to the intermediate transfer belt 5 by a primary transfer device 8, and the transferred images are transferred collectively to a recording medium by a recording medium transfer device 11. The transfer device is provided with the image density detecting device 14, capable of detecting the density detection pattern formed on the intermediate transfer belt 5, when the recording medium is not fed, that is, when the recording medium transfer device 11 is made to retreat in a direction as shown by an arrow B, a shutter 15 preventing scattered toner or the like from adhering to the detection surface 14a of the image density detecting device 14, and a compression spring 17 interlocking the shutter 15 with the recording medium transfer device 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、電子写真方式の複写機やプリンタ等の画像形成装置の画像濃度検知装置に関し、特にフルカラーの画像形成装置における中間転写装置の画像濃度検知装置に関する。   The present invention relates to an image density detection apparatus for an image forming apparatus such as an electrophotographic copying machine or a printer, and more particularly to an image density detection apparatus for an intermediate transfer apparatus in a full-color image forming apparatus.

従来、この種の中間転写装置を有するフルカラーの画像形成装置としては、画像情報に応じた各色の顕像を形成して担持する第１の像担持体としての例えば複数の感光体と、これら複数の感光体にそれぞれニップ部で圧接し、複数のローラに架設されて所定方向に回動する第２の像担持体としての例えば無端状の中間転写ベルトと、それぞれの感光体上に形成された単色の画像を中間転写ベルト上に順次重ね合わせて転写する第１の転写手段と、中間転写ベルト上に転写された画像を記録媒体に一括転写する第２の転写手段としての記録媒体転写装置とを備えたものが知られている。
そして、上記のような画像形成装置において、中間転写ベルトに転写されるトナー像形成条件の最適化を図るため、ジョブ終了時やジョブ開始前の記録媒体非通紙時に、濃度を変更した複数の濃度検知パターンを中間転写ベルト上に形成してそれらの画像濃度を検知する画像濃度検知装置を有するものも公知であり、さらに、このような中間転写装置の画像濃度検知装置を有する画像形成装置において、飛散トナー等の微粉が画像濃度検知装置の検知面に付着することを防止する汚れ防止用のシャッタ装置を設けたものも知られている。 Conventionally, as a full-color image forming apparatus having this type of intermediate transfer device, for example, a plurality of photoconductors as a first image carrier that forms and carries a visible image of each color according to image information, and a plurality of these For example, an endless intermediate transfer belt as a second image carrier that is pressed against each of the photoconductors at the nip portion and is rotated by a plurality of rollers and rotated in a predetermined direction, and formed on each of the photoconductors. A first transfer unit that sequentially superimposes and transfers a monochrome image on an intermediate transfer belt; and a recording medium transfer device as a second transfer unit that collectively transfers the images transferred on the intermediate transfer belt to a recording medium; The one with is known.
In the image forming apparatus as described above, in order to optimize the toner image forming conditions transferred to the intermediate transfer belt, a plurality of density changed at the end of the job or when the recording medium is not passed before the start of the job. Also known is an image forming apparatus having an image density detecting device for forming a density detecting pattern on an intermediate transfer belt and detecting the image density thereof. In addition, there is also known a device provided with a shutter device for preventing contamination, which prevents fine powder such as scattered toner from adhering to the detection surface of the image density detection device.

しかしながら、このような従来の中間転写装置の画像濃度検知装置にあっては、シャッタ装置を作動させるために別個に設けられるアクチュエータや、記録媒体通紙時にはシャッタ装置を作動不能にするロック手段等を狹少なスペース内に設けなければならず、生産コストの上昇を招くとともに複雑な構成により、作動不能となるおそれもあった。
この発明は上記の点に鑑みてなされたものであり、簡単な構成で画像検知装置の汚れを防止する中間転写装置の画像濃度検知装置を提供することを目的とする。 However, in such an image density detection device of the conventional intermediate transfer device, an actuator provided separately for operating the shutter device, a lock means for disabling the shutter device when a recording medium is passed, or the like is provided. It must be provided in a small space, leading to an increase in production cost and a possibility of being inoperable due to a complicated configuration.
The present invention has been made in view of the above points, and an object of the present invention is to provide an image density detection device for an intermediate transfer device that prevents contamination of the image detection device with a simple configuration.

この発明は上記の目的を達成するため、画像情報に応じたトナー像を第１の像担持体に形成するトナー像形成装置と、上記第１の像担持体に形成されたトナー像を第２の像担持体に転写する中間転写装置と、上記第２の像担持体に転写された画像を記録媒体に一括転写可能で上記第２の像担持体から離接可能な記録媒体転写装置と、上記第２の像担持体に転写された濃度検知パターンの濃度を検知する画像濃度検知装置と、この画像濃度検知装置へ飛散するトナー等の微粉の付着を防止するシャッタ装置とを有する画像形成装置における中間転写装置の画像濃度検知装置であって、上記記録媒体転写装置の上記第２の像担持体からの離接に連動して上記シャッタ装置を開閉させるようにした中間転写装置の画像濃度検知装置を提供するものである。
そして、上記の装置において、上記シャッタ装置は、その開閉作動により上記画像濃度検知装置へ付着した飛散トナー等の微粉を除去可能なクリーニング部材を有するのがよく、そのクリーニング部材は着脱可能であるのが好ましい。また、上記の装置において、上記クリーニング部材は弾性体からなるようにしてもよく、毛ブラシ状に構成されていても差し支えない。 In order to achieve the above object, the present invention provides a toner image forming apparatus that forms a toner image corresponding to image information on a first image carrier, and a second toner image formed on the first image carrier. An intermediate transfer device for transferring the image to the image carrier, a recording medium transfer device capable of transferring the image transferred to the second image carrier to the recording medium in a lump and being able to be separated from and contacted with the second image carrier; An image forming apparatus comprising: an image density detecting device for detecting the density of the density detecting pattern transferred to the second image carrier; and a shutter device for preventing adhesion of fine powder such as toner scattered to the image density detecting device. An image density detection device for an intermediate transfer device in which the shutter device is opened and closed in conjunction with the separation and contact of the recording medium transfer device from the second image carrier. Providing equipment That.
In the above apparatus, the shutter device preferably has a cleaning member capable of removing fine particles such as scattered toner adhering to the image density detection device by opening and closing operation thereof, and the cleaning member is removable. Is preferred. Further, in the above apparatus, the cleaning member may be made of an elastic body or may be configured as a bristle brush.

この発明による中間転写装置の画像濃度検知装置は上記のように、記録媒体転写装置の第２の像担持体からの離接に連動してシャッタ装置を開閉させるようにしたので、シャッタ装置を駆動するアクチュエータを別個に設ける必要がなく、簡単な構成で画像濃度検知装置の汚れを防止することができると同時に、複雑な構成による作動不良等のおそれを未然に回避することが可能になる。   As described above, the image density detection device of the intermediate transfer device according to the present invention opens and closes the shutter device in conjunction with the separation and contact of the recording medium transfer device from the second image carrier. There is no need to provide a separate actuator, and it is possible to prevent contamination of the image density detection device with a simple configuration, and at the same time, it is possible to avoid the possibility of malfunction due to a complicated configuration.

以下この発明の実施形態を図面に基づいて具体的に説明する。
図１はこの発明を実施した実施例１を模式的に示す構成図である。図示しないスキャナ等からの画像情報に応じて例えばイエロー，シアン，マゼンタ，ブラックの４つのトナー像を形成する第１の像担持体であるドラム状の感光体１Ｙ，１Ｃ，１Ｍ，１Ｋ（以下、特定しない場合は単に「感光体１」という）が、それぞれ図で時計方向に回転可能に並設してあり、感光体１の外周部には転写後表面に残留するトナーをかき落とすクリーニング装置２、感光体１の表面を帯電させる帯電装置３、それぞれ扱うトナーの色が異なる現象装置４が配設されている。感光体１は直径が３０〜１００ｍｍ程度のアルミニウムの円筒表面に、光導電性物質である有機半導体の層を設けたものであり、それぞれの感光体１Ｙ，１Ｃ，１Ｍ，１Ｋの図で上部のみが第２の像担持体であるループ状の中間転写ベルト５の表面５ａに接している。この中間転写ベルト５はそれぞれ反時計方向に回転するローラ６，７間に張架されて矢印Ａ方向に回動し、その裏面５ｂ側には１次転写装置８がそれぞれの感光体１Ｙ，１Ｃ，１Ｍ，１Ｋと中間転写ベルト５とのニップ部近傍に配設されている。中間転写ベルト５は、基部の厚みが５０〜６００ｍｍの樹脂フィルムあるいはゴムを基体にした無端状ベルトからなり、感光体１からトナーを転写可能にする抵抗値を備えており、その表面５ａ側には、中間転写ベルト５より記録媒体に転写した後に中間転写ベルト表面に残留する不要のトナーを拭い去るクリーニング装置９が設けてある。 Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a block diagram schematically showing a first embodiment in which the present invention is implemented. For example, drum-shaped photoreceptors 1Y, 1C, 1M, and 1K (hereinafter referred to as the first image carriers) that form four toner images of yellow, cyan, magenta, and black according to image information from a scanner (not shown). Cleaning device 2 that scrapes off toner remaining on the surface after transfer on the outer peripheral portion of photoconductor 1 is arranged side by side so as to rotate clockwise in the figure. A charging device 3 for charging the surface of the photoreceptor 1 and a phenomenon device 4 in which the color of the toner to be handled are different are provided. The photoconductor 1 is formed by providing an organic semiconductor layer, which is a photoconductive substance, on an aluminum cylindrical surface having a diameter of about 30 to 100 mm. Only the upper portion of each photoconductor 1Y, 1C, 1M, and 1K is illustrated. Is in contact with the surface 5a of the loop-shaped intermediate transfer belt 5 as the second image carrier. The intermediate transfer belt 5 is stretched between rollers 6 and 7 that rotate in the counterclockwise direction, and rotates in the direction of arrow A. On the back surface 5b side, the primary transfer device 8 has the photoreceptors 1Y and 1C. , 1M, 1K and the intermediate transfer belt 5 are disposed in the vicinity of the nip portion. The intermediate transfer belt 5 is made of an endless belt having a base portion of a resin film or rubber having a base thickness of 50 to 600 mm, and has a resistance value that allows toner to be transferred from the photoreceptor 1. Is provided with a cleaning device 9 for wiping off unnecessary toner remaining on the surface of the intermediate transfer belt after being transferred from the intermediate transfer belt 5 to the recording medium.

中間転写ベルト５の図１で右方には、１次転写装置８により感光体１から中間転写ベルト５へ転写された画像を、レジストローラ１０からタイミングを合わせて供給される記録媒体（図示しない）へ転写する記録媒体転写装置１１が設けてある。記録媒体転写装置１１は、支点１２を中心として矢印Ｂ方向に搖動可能な支持体１３に設けられ、記録媒体転写装置１１を常時中間転写ベルト５に圧接させる方向へ付勢している。中間転写ベルト５と記録媒体転写装置１１との接触点Ｓの下流側には、中間転写ベルト５へ転写された画像の濃度を検知可能な検知面１４ａを備えた画像濃度検知装置１４が配設され、その下方には開口部１５ａを備えたシャッタ１５を矢示Ｃ方向に開放可能に設け、常時閉止状態に保持し、飛散トナー等の微粉が画像濃度検知装置１４の検知面１４ａに付着して検知精度が劣化することを防止している。
ここまでの構成は従来より公知の構成とほぼ同様であるが、以下にこの発明の主要部を説明する。 On the right side of FIG. 1 of the intermediate transfer belt 5 is a recording medium (not shown) on which an image transferred from the photosensitive member 1 to the intermediate transfer belt 5 by the primary transfer device 8 is supplied from the registration roller 10 in time. ) Is provided. The recording medium transfer device 11 is provided on a support 13 that can swing in the direction of arrow B around a fulcrum 12 and urges the recording medium transfer device 11 in a direction that always presses the intermediate transfer belt 5. On the downstream side of the contact point S between the intermediate transfer belt 5 and the recording medium transfer device 11, an image density detection device 14 having a detection surface 14a capable of detecting the density of the image transferred to the intermediate transfer belt 5 is disposed. Below that, a shutter 15 having an opening 15a is provided so as to be openable in the direction of arrow C, and is kept in a normally closed state, so that fine powder such as scattered toner adheres to the detection surface 14a of the image density detection device 14. This prevents the detection accuracy from deteriorating.
The configuration so far is almost the same as the conventionally known configuration, but the main part of the present invention will be described below.

〔実施例１〕
この実施例１では、図１に示したシャッタ１５の移動方向の両端部に立上り部１５ｂ，１５ｃを形成し、一方の立上り部１５ｂを、記録媒体転写装置１１を支持する支持体１３の図で上部に突設した突起１３ａに係合し得るようにすると共に、他方の立上り部１５ｃと固定立上り部１６との間に圧縮ばね１７を係着してシャッタ１５を矢印Ｃ方向に付勢し、これらによりシャッタ装置を形成している。なお、圧縮ばね１７によるシャッタ１５の付勢力は記録媒体転写装置１１を中間転写ベルト５へ圧接させる支持体１３の付勢力より弱く設定してあり、常態では記録媒体転写装置１１は中間転写ベルト５への圧接状態を保っている。
このような構成で、記録媒体転写装置１１が中間転写ベルト５に圧接している図示の記録媒体転写可能状態では、支持体１３の突起１３ａが圧縮ばね１７の付勢力に抗してシャッタ１５を図で左方に押圧し、画像濃度検知装置１４の検知面１４ａはシャッタ１５に覆われて飛散トナーや雰囲気中に浮遊する塵埃等の微粉が検知面１４ａへ付着することを防止している。また、ジョブ終了時やジョブ開始前の記録媒体非給送時に画像濃度の異なる複数の濃度検知パターンを中間転写ベルト５上に形成して画像濃度調整を行うために、濃度検知パターンが中間転写ベルト５へ転写された際には、記録媒体転写装置１１を支持する支持体１３をその付勢力に抗して矢示Ｂで示す時計方向へ搖動させ、記録媒体転写装置１１を中間転写ベルト５から離間させる。これにより、濃度検知パターンは記録媒体転写装置１１に触れることが防止され、同時に、シャッタ１５は圧縮ばね１７の弾力性により支持体１３の突起１３ａに追従して図で右方へ移動し、シャッタ１５の開口部１５ａを介して画像濃度検知装置１４が中間転写ベルト５に転写された画像濃度検知パターンを検知して画像濃度を調整することが可能になる。 [Example 1]
In the first embodiment, rising portions 15 b and 15 c are formed at both ends in the moving direction of the shutter 15 shown in FIG. 1, and one rising portion 15 b is a view of the support 13 that supports the recording medium transfer device 11. It is possible to engage with the protrusion 13a projecting from the upper part, and a compression spring 17 is engaged between the other rising part 15c and the fixed rising part 16 to urge the shutter 15 in the direction of arrow C, These form a shutter device. Note that the urging force of the shutter 15 by the compression spring 17 is set to be weaker than the urging force of the support 13 that presses the recording medium transfer device 11 against the intermediate transfer belt 5, and the recording medium transfer device 11 normally has the intermediate transfer belt 5. The pressure contact state is maintained.
With such a configuration, in the illustrated recording medium transferable state in which the recording medium transfer device 11 is in pressure contact with the intermediate transfer belt 5, the protrusion 13 a of the support 13 moves the shutter 15 against the urging force of the compression spring 17. When pressed to the left in the figure, the detection surface 14a of the image density detection device 14 is covered with a shutter 15 to prevent dust particles such as scattered toner and dust floating in the atmosphere from adhering to the detection surface 14a. Further, the density detection pattern is used as an intermediate transfer belt in order to adjust the image density by forming a plurality of density detection patterns having different image densities on the intermediate transfer belt 5 at the end of the job or when the recording medium is not fed before the start of the job. 5, the support 13 that supports the recording medium transfer device 11 is swung in the clockwise direction indicated by arrow B against the biasing force, and the recording medium transfer device 11 is moved from the intermediate transfer belt 5. Separate. As a result, the density detection pattern is prevented from touching the recording medium transfer device 11, and at the same time, the shutter 15 follows the protrusion 13a of the support 13 due to the elasticity of the compression spring 17, and moves to the right in the drawing. The image density detection device 14 can detect the image density detection pattern transferred to the intermediate transfer belt 5 through the 15 openings 15a and adjust the image density.

〔実施例２〕
図２はこの発明の実施例２の中間転写装置を模式的に示す構成図である。
この実施例２では、画像濃度検知装置１４の検知面１４ａを保護するシャッタ１５の上面にクリーニング部材１８を例えば両面テープ等により着脱可能に貼着したものであり、その他の構成は図１に示した実施例１と同様であるので、図１に対応する部分には同一の符号を付して示し、その説明は省略する。なお、クリーニング部材は弾性部材であってもよく、毛ブラシ状のものであってもよい。
このような構成によれば、万一、雰囲気中を浮遊するトナー等の微粉がシャッタ１５との僅かな間隙を通って画像濃度検知装置１４の検知面１４ａに付着した場合でも、シャッタ１５が矢示Ｃ方向に移動することによりクリーニング部材１５が検知面１４ａを払拭してクリーニングするため、常に中間転写ベルト５へ形成された濃度検知パターンを良好な状態で検知することが可能になる。
さらに、クリーニング部材１５をマジックテープや離脱可能な接着剤等でシャッタ１５に着脱可能とすれば、クリーニング部材１５の交換を容易に行うことができる。また、クリーニング部材１５を弾性を有する樹脂材等からなる弾性部材や毛ブラシ状にすることにより、クリーニング部材１５の検知面１４ａへの接触を一層確実にすることができ、画像濃度検知装置１４のクリーニング性能をさらに向上させることが可能になる。 [Example 2]
FIG. 2 is a block diagram schematically showing an intermediate transfer apparatus according to Embodiment 2 of the present invention.
In the second embodiment, the cleaning member 18 is detachably attached to the upper surface of the shutter 15 that protects the detection surface 14a of the image density detection device 14, for example, with a double-sided tape. The other configuration is shown in FIG. Therefore, the parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. The cleaning member may be an elastic member or a bristle brush.
According to such a configuration, even if fine powder such as toner floating in the atmosphere passes through a slight gap with the shutter 15 and adheres to the detection surface 14a of the image density detection device 14, the shutter 15 is moved to the arrow. Since the cleaning member 15 wipes and cleans the detection surface 14a by moving in the direction C, the density detection pattern formed on the intermediate transfer belt 5 can always be detected in a good state.
Furthermore, if the cleaning member 15 can be attached to and detached from the shutter 15 with a velcro tape or a removable adhesive, the cleaning member 15 can be easily replaced. Further, by making the cleaning member 15 into an elastic member made of an elastic resin material or the like or a bristle brush shape, the contact of the cleaning member 15 with the detection surface 14a can be further ensured. The cleaning performance can be further improved.

この発明による中間転写装置の画像濃度検知装置は、第１の像担持体が円筒状の感光体に限るものではなく、ベルト状の感光体を有する中間転写装置の画像濃度検知装置にも何ら支障なく実施することができる。   The image density detecting device of the intermediate transfer device according to the present invention is not limited to the cylindrical photoconductor as the first image carrier, but has any problem with the image density detecting device of the intermediate transfer device having a belt-like photoconductor. Can be implemented without.

この発明の実施例１を模式的に示す構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows typically Example 1 of this invention. この発明の実施例２を模式的に示す構成図である。It is a block diagram which shows typically Example 2 of this invention.

符号の説明Explanation of symbols

１：感光体（第１の像担持体） ５：中間転写ベルト（第２の像担持体） ８：１次転写装置 １１：記録媒体転写装置 １３：支持体 １４：画像濃度検知装置 １５：シャッタ １７：圧縮ばね １８：クリーニング部材
1: Photoconductor (first image carrier) 5: Intermediate transfer belt (second image carrier) 8: Primary transfer device 11: Recording medium transfer device 13: Support 14: Image density detection device 15: Shutter 17: Compression spring 18: Cleaning member

Claims (5)

画像情報に応じたトナー像を第１の像担持体に形成するトナー像形成装置と、前記第１の像担持体に形成されたトナー像を第２の像担持体に転写する中間転写装置と、前記第２の像担持体に転写された画像を記録媒体に一括転写可能で前記第２の像担持体から離接可能な記録媒体転写装置と、前記第２の像担持体に転写された濃度検知パターンの濃度を検知する画像濃度検知装置と、該画像濃度検知装置へ飛散するトナー等の微粉の付着を防止するシャッタ装置とを有する画像形成装置における中間転写装置の画像濃度検知装置であって、
前記記録媒体転写装置の前記第２の像担持体からの離接に連動して前記シャッタ装置を開閉させるようにしたことを特徴とする中間転写装置の画像濃度検知装置。 A toner image forming apparatus for forming a toner image corresponding to image information on the first image carrier, and an intermediate transfer device for transferring the toner image formed on the first image carrier to the second image carrier; The image transferred to the second image carrier can be transferred to the recording medium at once, and the recording medium transfer device can be moved away from the second image carrier and transferred to the second image carrier. An image density detection device for an intermediate transfer device in an image forming apparatus having an image density detection device for detecting the density of a density detection pattern and a shutter device for preventing adhesion of fine powder such as toner scattered to the image density detection device. And
An image density detection device for an intermediate transfer device, wherein the shutter device is opened and closed in conjunction with the separation and contact of the recording medium transfer device from the second image carrier. 前記シャッタ装置は、その開閉作動により前記画像濃度検知装置へ付着した飛散トナー等の微粉を除去可能なクリーニング部材を有することを特徴とする請求項１記載の中間転写装置の画像濃度検知装置。   2. The image density detecting device of an intermediate transfer device according to claim 1, wherein the shutter device has a cleaning member capable of removing fine powder such as scattered toner adhering to the image density detecting device by opening and closing operation thereof. 前記クリーニング部材は着脱可能であることを特徴とする請求項２記載の中間転写装置の画像濃度検知装置。   3. The image density detecting device for an intermediate transfer device according to claim 2, wherein the cleaning member is detachable. 前記クリーニング部材は弾性体からなることを特徴とする請求項２又は３記載の中間転写装置の画像濃度検知装置。   4. The image density detecting device for an intermediate transfer device according to claim 2, wherein the cleaning member is made of an elastic body. 前記クリーニング部材は毛ブラシ状に構成されていることを特徴とする請求項２又は３記載の中間転写装置の画像濃度検知装置。
4. The image density detecting device for an intermediate transfer device according to claim 2, wherein the cleaning member is formed in a bristle brush shape.
JP2003303515A 2003-08-27 2003-08-27 Image density detector for intermediate transfer device Expired - Fee Related JP4312547B2 (en)

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US8095040B2 (en) * 2007-12-17 2012-01-10 Sharp Kabushiki Kaisha Intermediate transfer-type image forming apparatus with separation/contact mechanism
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US8095040B2 (en) * 2007-12-17 2012-01-10 Sharp Kabushiki Kaisha Intermediate transfer-type image forming apparatus with separation/contact mechanism
US7933531B2 (en) 2007-12-27 2011-04-26 Brother Kogyo Kabushiki Kaisha Image formation device
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US8218988B2 (en) 2008-07-15 2012-07-10 Sharp Kabushiki Kaisha Image forming apparatus with transfer belt cleaning function
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US8831469B2 (en) 2011-07-22 2014-09-09 Samsung Electronics Co., Ltd. Image forming apparatus
US8965232B2 (en) 2012-06-05 2015-02-24 Ricoh Company, Ltd. Positioning device to position a first member relative to a second member and image forming apparatus incorporating same
US9025986B2 (en) 2012-06-05 2015-05-05 Ricoh Company, Ltd. Moving device assembly and image forming apparatus including the moving device assembly
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US9046622B2 (en) 2012-08-28 2015-06-02 Ricoh Company, Ltd. Image forming apparatus

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