JP2000122445A - Transfer roller pressurizing device - Google Patents
Transfer roller pressurizing deviceInfo
- Publication number
- JP2000122445A JP2000122445A JP10307879A JP30787998A JP2000122445A JP 2000122445 A JP2000122445 A JP 2000122445A JP 10307879 A JP10307879 A JP 10307879A JP 30787998 A JP30787998 A JP 30787998A JP 2000122445 A JP2000122445 A JP 2000122445A
- Authority
- JP
- Japan
- Prior art keywords
- transfer roller
- force
- pressing
- gear
- spring
- 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
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- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、複写機、プリン
タ、ファクシミリ、それらの複合機等の画像形成装置に
おける転写ローラ加圧装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer roller pressing device in an image forming apparatus such as a copying machine, a printer, a facsimile, and a multifunction machine thereof.
【0002】[0002]
【従来の技術】電子写真方式の画像形成装置において
は、感光体の周囲に、帯電、露光(光書き込み)、現
像、転写(及び分離)、クリーニング、除電などの各プ
ロセスユニットが配置される。転写手段としては、非接
触方式の転写チャージャ、接触方式の転写ローラ、転写
ベルト等がある。転写ローラを用いる場合、その一端部
に設けた被駆動伝達ギアが、本体の駆動源によって回転
駆動する感光体ドラム端部の駆動伝達ギアと連結され、
かつ、両端の軸受部材を介して、一対の加圧部材により
感光体ドラム方向に付勢されるようになっている。2. Description of the Related Art In an electrophotographic image forming apparatus, process units such as charging, exposure (light writing), development, transfer (and separation), cleaning, and charge removal are arranged around a photoreceptor. Examples of the transfer unit include a non-contact type transfer charger, a contact type transfer roller, and a transfer belt. When a transfer roller is used, a driven transmission gear provided at one end thereof is connected to a drive transmission gear at an end of the photosensitive drum which is rotationally driven by a drive source of the main body,
In addition, the pair of pressure members are urged toward the photosensitive drum via bearing members at both ends.
【0003】給紙部から給紙される用紙は、感光体ドラ
ム上のトナー像とタイミングをとって転写部に送り込ま
れ、感光体ドラムと転写ローラ間のニップ部に挟持され
て搬送される。その過程で、転写ローラによりトナーと
逆極性のバイアス電圧を用紙の裏面に印加して、トナー
像を用紙表面に転写させる。A sheet fed from a sheet feeding section is fed to a transfer section at a timing with a toner image on a photosensitive drum, and is conveyed while being sandwiched by a nip between the photosensitive drum and a transfer roller. In the process, a bias voltage having a polarity opposite to that of the toner is applied to the back surface of the sheet by the transfer roller, and the toner image is transferred to the surface of the sheet.
【0004】ところで、転写ローラを用いる場合、感光
体に対する転写ローラの加圧力は、画像転写むら等を生
じさせないために、ローラ軸方向で均等であることが望
ましい。しかし、転写ローラの両端軸部に加圧部材とし
てのばねを配設して、ローラ軸の両端でそれぞれ加圧す
る方式では、加圧力の誤差が生じやすい。When a transfer roller is used, it is desirable that the pressing force of the transfer roller against the photoreceptor is uniform in the roller axis direction in order to prevent image transfer unevenness or the like. However, in a method in which springs as pressing members are provided at both ends of the transfer roller and pressure is applied to both ends of the roller shaft, an error in the pressing force is likely to occur.
【0005】このようなことから、特開平7−1345
06号公報に記載の技術が提案されている。これは、可
転写画像を形成担持させた像担持体に対して転写材を転
写部材(転写ローラ)で圧接させて像担持体側の可転写
画像を転写材側に転写させる画像形成装置において、転
写部材の両端の軸を一部材で支持する支持部材を有し、
該支持部材の約中心部を転写部材が像担持体に圧接され
る方向に加圧する加圧部材を有することにより、加圧力
が転写部材軸方向に不均一であることによる画像転写む
ら等の発生を防止して良好な画像形成を行わせるもので
ある。In view of the above, Japanese Patent Application Laid-Open No.
A technique described in Japanese Patent Application Publication No. 06-2006 is proposed. This is an image forming apparatus in which a transfer material is pressed against a transfer member (transfer roller) against an image carrier on which a transferable image is formed and supported, thereby transferring the transferable image on the image carrier to the transfer material side. A support member that supports the shafts at both ends of the member with one member,
The provision of a pressure member for pressing the central portion of the support member in the direction in which the transfer member is pressed against the image carrier causes image transfer unevenness due to uneven pressing force in the axial direction of the transfer member. To form a good image.
【0006】[0006]
【発明が解決しようとする課題】上述したように、転写
ローラの両端の軸を1つの支持部材で支持し、支持部材
の中央と底板シャーシの間に加圧部材を配設する技術が
提案されているが、転写ローラ全体を支持する大掛かり
な支持部材が必要になり、また、中央の一点でばねによ
り支持するため、支持機構として不安定になる欠点があ
る。このようなことから、本発明は、転写ローラの両端
軸部にそれぞれ、ばね力の同じばねを介在させる方式を
前提とする。ここで、転写ローラ端部のギア部と感光体
ドラム端部のギア部がかみ合うことで、転写ローラは感
光体ドラム側から駆動力を伝達されるが、上記方式では
駆動時にギアの歯面法線方向に駆動力が働き、その力の
ばね伸縮方向の分力が加圧力を低下させるように働き、
転写ローラ軸方向に加圧力が均等でなくなってしまう。As described above, there has been proposed a technique in which the shafts at both ends of the transfer roller are supported by one support member, and a pressing member is disposed between the center of the support member and the bottom plate chassis. However, a large supporting member for supporting the entire transfer roller is required, and since it is supported by a spring at a central point, there is a disadvantage that the supporting mechanism becomes unstable. For this reason, the present invention is based on the premise that a spring having the same spring force is interposed between the shaft portions at both ends of the transfer roller. Here, when the gear at the end of the transfer roller and the gear at the end of the photosensitive drum engage, the transfer roller receives the driving force from the photosensitive drum side. The driving force acts in the linear direction, and the component force in the spring expansion and contraction direction of the force acts to reduce the pressing force,
The pressing force is not uniform in the transfer roller axial direction.
【0007】そこで本発明は、転写ローラのギア部側端
部の加圧力が低下しても、ばねによる加圧力を転写ロー
ラ軸方向に均等に保つことができる転写ローラ加圧装置
を提供することを第1の目的とする。Accordingly, the present invention provides a transfer roller pressurizing device which can maintain the pressurized force of a spring evenly in the axial direction of the transfer roller even if the pressurized force at the gear portion side end of the transfer roller is reduced. As a first object.
【0008】また、感光体ドラムに転写ローラを加圧さ
せる構成には、幾つかの構成部品が関わっているため、
転写ローラの加圧力は機械間でばらつく。経済的にも転
写ローラ軸受部の摩耗やトナーや紙粉等の混入により、
転写ローラの駆動トルクが変動する。つまり、駆動時に
ギアの歯面法線方向に働く駆動力のばね伸縮方向の分力
が変化し、転写ローラの加圧力が転写ローラ軸方向に均
等でなくなってしまう。[0008] In addition, since several components are involved in the structure for pressing the transfer roller against the photosensitive drum,
The pressing force of the transfer roller varies between machines. Economically, due to the wear of the transfer roller bearing and the incorporation of toner and paper dust,
The driving torque of the transfer roller fluctuates. That is, the component of the driving force acting in the normal direction of the tooth surface of the gear at the time of driving in the spring expansion and contraction direction changes, and the pressing force of the transfer roller is not uniform in the axial direction of the transfer roller.
【0009】そこで本発明は、機械間のばらつきや経時
的変化に対応して、常に加圧力を転写ローラ軸方向に均
等に保つことを第2の目的とする。Therefore, a second object of the present invention is to keep the pressing force uniform in the axial direction of the transfer roller at all times in response to variations between machines and changes over time.
【0010】[0010]
【課題を解決するための手段】上記第1の目的を達成す
るために、請求項1記載の発明は、一端部に設けた被駆
動伝達ギアが、本体の駆動源によって回転駆動する感光
体ドラム端部の駆動伝達ギアと連結され、かつ、両端の
軸受部材を介して、一対の加圧部材により感光体ドラム
方向に付勢される転写ローラにあって、係止時の被駆動
伝達ギア側の加圧部材の加圧力を、駆動時にギアの歯面
法線方向に働く駆動力のばね伸縮方向の分力だけ高く設
定することを特徴とするものである。According to a first aspect of the present invention, there is provided a photosensitive drum in which a driven transmission gear provided at one end is rotated by a driving source of a main body. A transfer roller connected to an end drive transmission gear and urged in the direction of the photosensitive drum by a pair of pressurizing members via bearing members at both ends. The pressing force of the pressure member is set higher by a component force in the spring expansion and contraction direction of the driving force acting in the normal direction of the gear tooth surface during driving.
【0011】また上記第2の目的を達成するために、請
求項2記載の発明は、請求項1記載の転写ローラ加圧装
置において、少なくとも一方の加圧部材の加圧力を調整
可能としたことを特徴とするものである。According to a second aspect of the present invention, in order to achieve the second object, in the transfer roller pressing device according to the first aspect, the pressing force of at least one pressing member can be adjusted. It is characterized by the following.
【0012】[0012]
【発明の実施の形態】以下、本発明の実施形態を添付図
面を参照しながら説明する。図1は感光体ドラムと転写
ローラ間の駆動連結及び加圧機構を示す斜視図である。
図1に示すように、感光体ドラム1は、その端部のフラ
ンジ2の軸部2aとフランジ3の軸部3aを介して、機
械本体フレーム4の支持部4a,4bに支持されてい
る。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a driving connection between a photosensitive drum and a transfer roller and a pressing mechanism.
As shown in FIG. 1, the photosensitive drum 1 is supported by support portions 4a and 4b of a machine body frame 4 via a shaft portion 2a of a flange 2 and a shaft portion 3a of a flange 3 at its end.
【0013】転写ローラ5は、その両端の軸部5a,5
bが軸受け部材8a,8bに嵌合保持されている。本体
フレーム4に起立して設けた一対のガイド4c,4dに
その軸受け部材8a,8bが嵌め込み設置されており、
軸受け部材8a,8bはガイド4c,4dに沿って上下
可能となっている。従って、この軸受け部材8a,8b
に軸部5a,5bを介して固定されている転写ローラ5
も上下動可能になっている。The transfer roller 5 has shaft portions 5a and 5 at both ends thereof.
b is fitted and held by the bearing members 8a and 8b. Bearing members 8a, 8b are fitted and installed in a pair of guides 4c, 4d provided upright on the main body frame 4,
The bearing members 8a and 8b are vertically movable along the guides 4c and 4d. Therefore, the bearing members 8a, 8b
Transfer roller 5 fixed to shaft members 5a and 5b via shaft portions 5a and 5b
Can also be moved up and down.
【0014】ガイド4c,4dの底面と、その上方にあ
る軸受け部材8a,8bの間には、それぞれ加圧部材
(コイルばね)6,7が圧縮状態で介在されており、こ
の加圧部材6,7により軸受け部材8a,8bが上方に
付勢されることで、転写ローラ5は適宜の加圧力を以て
感光体ドラム1に圧接される。Pressing members (coil springs) 6 and 7 are interposed between the bottom surfaces of the guides 4c and 4d and the bearing members 8a and 8b, respectively, in a compressed state. , 7 urge the bearing members 8a, 8b upward, so that the transfer roller 5 is pressed against the photosensitive drum 1 with an appropriate pressing force.
【0015】そして、感光体ドラム1は、フランジ3の
ギア部3bが本体駆動連結ギア9から駆動を取り、転写
ローラ5はギア10が感光体ドラム1のフランジ2のギ
ア部2bから駆動を取っている。つまり、感光体ドラム
1の一端のギア部3bと本体駆動連結ギア9がかみ合っ
ており、感光体ドラム1の他端のギア部2bと転写ロー
ラ5の対向端部のギア10がかみ合っている。In the photosensitive drum 1, the gear portion 3b of the flange 3 is driven by the main body driving connection gear 9, and the transfer roller 5 is driven by the gear 10 from the gear portion 2b of the flange 2 of the photosensitive drum 1. ing. That is, the gear 3b at one end of the photosensitive drum 1 meshes with the main body drive connection gear 9, and the gear 2b at the other end of the photosensitive drum 1 meshes with the gear 10 at the opposite end of the transfer roller 5.
【0016】このような駆動連結機構により、本体の駆
動源からの駆動力が本体駆動連結ギア9を介して感光体
ドラム1に伝わり、感光体ドラム1が回転駆動すると同
時に、さらにギア部2b、ギア10を介して転写ローラ
5に伝わり、転写ローラ5が回転駆動する。With such a drive connection mechanism, the driving force from the drive source of the main body is transmitted to the photosensitive drum 1 via the main body drive connection gear 9, and the photosensitive drum 1 is rotationally driven, and at the same time, the gear portion 2b, The power is transmitted to the transfer roller 5 via the gear 10, and the transfer roller 5 is driven to rotate.
【0017】図2は感光体ドラムと転写ローラを回転さ
せたときに転写ローラに作用する力のベクトクルを示す
図である。図2に示すように、感光体ドラム1がA方向
(時計回り方向)に回転すると、フランジ2のギア部2
bとギア10の連結により、転写ローラ5もB方向(反
時計回り方向)に駆動される。このとき、ギアの歯面法
線方向に駆動力F1が作用する。そして、加圧部材6を
伸縮させる方向(図2の垂直下方向)にF1の分力F2
が働く。従って、この分力F2を考慮しないと、転写ロ
ーラ5の軸方向に均一な加圧力を得ることができないこ
とになる訳である。FIG. 2 is a diagram showing a vector of a force acting on the transfer roller when the photosensitive drum and the transfer roller are rotated. As shown in FIG. 2, when the photosensitive drum 1 rotates in the direction A (clockwise), the gear portion 2 of the flange 2 is rotated.
The transfer roller 5 is also driven in the direction B (counterclockwise) by the connection between the gear b and the gear 10. At this time, the driving force F1 acts in the normal direction of the gear tooth surface. Then, the component force F2 of F1 is applied in the direction of expanding and contracting the pressing member 6 (vertical downward direction in FIG. 2).
Works. Therefore, if this component force F2 is not considered, a uniform pressing force cannot be obtained in the axial direction of the transfer roller 5.
【0018】図3は第1の実施の形態を示す転写ローラ
加圧装置の構成図である。上述したように、転写ローラ
5にあってギア10側には、F2の分力が下向きに掛か
るので、加圧部材6のばね力は、その分だけ、加圧部材
7より大きいものとしなければ均一な加圧力を得ること
ができない。そこで、加圧部材7のばね力をF4とした
とき、加圧部材6のばね力をそれよりF2分だけ多い値
とする。すなわち、加圧部材6のばね力F3は、F3=
F4+F2で表される。第1の実施形態では、同じ圧縮
長で加圧部材6のばね力がF3、加圧部材7のばね力が
F4となるように、ばね定数を設定する。FIG. 3 is a configuration diagram of the transfer roller pressing device according to the first embodiment. As described above, since the component force of F2 is applied downward on the gear 10 side in the transfer roller 5, the spring force of the pressing member 6 must be larger than that of the pressing member 7 by that amount. A uniform pressing force cannot be obtained. Therefore, when the spring force of the pressing member 7 is F4, the spring force of the pressing member 6 is set to a value larger by F2 than that. That is, the spring force F3 of the pressing member 6 is expressed as F3 =
It is represented by F4 + F2. In the first embodiment, the spring constant is set such that the spring force of the pressing member 6 is F3 and the spring force of the pressing member 7 is F4 at the same compression length.
【0019】図4は第2の実施の形態を示す転写ローラ
加圧装置の構成図である。この実施形態も、加圧部材6
のばね力がF3(=F4+F2)であり、加圧部材7の
ばね力がF4となるようにするが、第1の実施形態とは
異なり、ばね定数を同じにし、圧縮長をそれぞれ設定す
ることで(加圧部材6の圧縮長<加圧部材7の圧縮
長)、F3,F4を得る。FIG. 4 is a configuration diagram of a transfer roller pressing device according to a second embodiment. In this embodiment, the pressing member 6
Is set to F3 (= F4 + F2) and the spring force of the pressing member 7 is set to F4. However, unlike the first embodiment, the spring constant is set to be the same and the compression length is set. (Compressed length of pressing member 6 <compressed length of pressing member 7) to obtain F3 and F4.
【0020】図5は第3の実施の形態を示す転写ローラ
加圧装置の構成図である。この実施形態は、加圧部材の
ばね力を調整することができるようにしたものである。
ばね力調整部材11は、ねじ部11aと、つまみ部11
bと、加圧部材6の位置規制部11cとから構成されて
いる。つまみ部11bをC方向に回転させると、ねじ部
11aのかみ合いにより、ばね力調整部材11がD方向
に移動し、加圧部材6のばね力を高めるようになる。逆
に、つまみ部11bをC方向と逆向きに回転させれば、
加圧部材6のばね力を低くすることができる。なお、加
圧部材7側のばね力を調整してもよい。FIG. 5 is a configuration diagram of a transfer roller pressing device according to a third embodiment. In this embodiment, the spring force of the pressing member can be adjusted.
The spring force adjusting member 11 includes a screw portion 11a and a knob portion 11a.
b and a position restricting portion 11c of the pressing member 6. When the knob 11b is rotated in the C direction, the spring force adjusting member 11 moves in the D direction due to the engagement of the screw portion 11a, and the spring force of the pressing member 6 is increased. Conversely, if the knob 11b is rotated in the direction opposite to the direction C,
The spring force of the pressing member 6 can be reduced. Note that the spring force of the pressing member 7 may be adjusted.
【0021】[0021]
【発明の効果】請求項1記載の発明によれば、係止時の
被駆動伝達ギア側の加圧部材の加圧力を、駆動時にギア
の歯面法線方向に働く駆動力のばね伸縮方向の分力だけ
高く設定するようにしたので、その分力による被駆動伝
達ギア側の加圧部材の加圧力低下を補償し、転写ローラ
の軸方向に均等に圧力を掛けることができる。従って、
転写紙の搬送速度が搬送方向左右で均等になると共に、
加圧力不均一による転写むら等の発生を防止することが
できる。According to the first aspect of the present invention, the pressing force of the pressing member on the driven transmission gear side at the time of locking is changed by the spring expansion / contraction direction of the driving force acting in the normal direction of the gear tooth surface during driving. , The pressure of the pressurizing member on the driven transmission gear side is reduced by the component force, and the pressure can be evenly applied in the axial direction of the transfer roller. Therefore,
The transfer speed of the transfer paper becomes equal in the left and right directions,
The occurrence of transfer unevenness or the like due to uneven pressing force can be prevented.
【0022】請求項2記載の発明によれば、少なくとも
一方の加圧部材の加圧力を調整可能としたので、機械間
のばらつきや経時的変化に対応することができ、上記の
効果をさらに高めることができる。According to the second aspect of the present invention, since the pressing force of at least one of the pressing members can be adjusted, it is possible to cope with variations between machines and changes with time, and the above effect is further enhanced. be able to.
【図1】感光体ドラムと転写ローラ間の駆動連結機構及
び加圧機構を示す斜視図である。FIG. 1 is a perspective view showing a drive connection mechanism and a pressure mechanism between a photosensitive drum and a transfer roller.
【図2】感光体ドラムと転写ローラを回転させたときに
転写ローラに作用する力のベクトルを示す図である。FIG. 2 is a diagram illustrating a vector of a force acting on a transfer roller when a photosensitive drum and a transfer roller are rotated.
【図3】本発明の第1の実施の形態を示す転写ローラ加
圧装置の構成図である。FIG. 3 is a configuration diagram of a transfer roller pressing device according to the first embodiment of the present invention.
【図4】本発明の第2の実施の形態を示す転写ローラ加
圧装置の構成図である。FIG. 4 is a configuration diagram of a transfer roller pressing device according to a second embodiment of the present invention.
【図5】本発明の第3の実施の形態を示す転写ローラ加
圧装置の構成図である。FIG. 5 is a configuration diagram of a transfer roller pressing device according to a third embodiment of the present invention.
1 感光体ドラム 2,3 フランジ 2a,3a 軸部 2b,3b ギア部 4 機械本体フレーム 4a,4b 支持部 4c,4d ガイド 5 転写ローラ 5a,5b 軸部 6,7 加圧部材 8a,8b 軸受け部材 9 本体駆動連結ギア 10 ギア Reference Signs List 1 photosensitive drum 2, 3 flange 2a, 3a shaft 2b, 3b gear 4 machine body frame 4a, 4b support 4c, 4d guide 5 transfer roller 5a, 5b shaft 6,7 pressure member 8a, 8b bearing member 9 Body drive coupling gear 10 Gear
Claims (2)
の駆動源によって回転駆動する感光体ドラム端部の駆動
伝達ギアと連結され、かつ、両端の軸受部材を介して、
一対の加圧部材により感光体ドラム方向に付勢される転
写ローラにあって、 係止時の被駆動伝達ギア側の加圧部材の加圧力を、駆動
時にギアの歯面法線方向に働く駆動力のばね伸縮方向の
分力だけ高く設定することを特徴とする転写ローラ加圧
装置。1. A driven transmission gear provided at one end is connected to a drive transmission gear at an end of a photosensitive drum that is rotationally driven by a drive source of a main body, and is connected via bearing members at both ends.
A transfer roller which is urged in the direction of the photosensitive drum by a pair of pressing members, wherein the pressing force of the pressing member on the driven transmission gear side at the time of locking acts in the normal direction of the gear tooth surface when driven. A transfer roller pressurizing device, wherein the driving force is set higher by a component force in a spring expansion / contraction direction.
いて、 少なくとも一方の加圧部材の加圧力を調整可能としたこ
とを特徴とする転写ローラ加圧装置。2. The transfer roller pressing device according to claim 1, wherein the pressing force of at least one pressing member is adjustable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10307879A JP2000122445A (en) | 1998-10-14 | 1998-10-14 | Transfer roller pressurizing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10307879A JP2000122445A (en) | 1998-10-14 | 1998-10-14 | Transfer roller pressurizing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000122445A true JP2000122445A (en) | 2000-04-28 |
Family
ID=17974276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10307879A Pending JP2000122445A (en) | 1998-10-14 | 1998-10-14 | Transfer roller pressurizing device |
Country Status (1)
Country | Link |
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JP (1) | JP2000122445A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002318483A (en) * | 2001-04-20 | 2002-10-31 | Ricoh Co Ltd | Image carrier unit |
JP2002341628A (en) * | 2001-05-21 | 2002-11-29 | Ricoh Co Ltd | Image carrier unit and image forming apparatus provided with it |
JP2003106329A (en) * | 2001-09-27 | 2003-04-09 | Toshiba Mach Co Ltd | Pressure device, and printing machine therewith |
JP2009229750A (en) * | 2008-03-21 | 2009-10-08 | Ricoh Co Ltd | Transfer device and image forming apparatus comprising the transfer device |
JP2010134325A (en) * | 2008-12-08 | 2010-06-17 | Fuji Xerox Co Ltd | Transfer device and image forming apparatus including the same |
JP2011123388A (en) * | 2009-12-14 | 2011-06-23 | Fuji Xerox Co Ltd | Transfer device and image forming apparatus |
US8014701B2 (en) | 2007-12-17 | 2011-09-06 | Ricoh Company, Ltd. | Contacting and separating mechanism and image forming apparatus |
US8095056B2 (en) | 2007-09-07 | 2012-01-10 | Ricoh Company, Ltd. | Pressure-applying device, 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 |
JP2015118164A (en) * | 2013-12-17 | 2015-06-25 | 富士ゼロックス株式会社 | Image forming apparatus and transfer device |
-
1998
- 1998-10-14 JP JP10307879A patent/JP2000122445A/en active Pending
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002318483A (en) * | 2001-04-20 | 2002-10-31 | Ricoh Co Ltd | Image carrier unit |
JP2002341628A (en) * | 2001-05-21 | 2002-11-29 | Ricoh Co Ltd | Image carrier unit and image forming apparatus provided with it |
JP2003106329A (en) * | 2001-09-27 | 2003-04-09 | Toshiba Mach Co Ltd | Pressure device, and printing machine therewith |
US8095056B2 (en) | 2007-09-07 | 2012-01-10 | Ricoh Company, Ltd. | Pressure-applying device, transfer device, and image forming apparatus |
US8014701B2 (en) | 2007-12-17 | 2011-09-06 | Ricoh Company, Ltd. | Contacting and separating mechanism and image forming apparatus |
JP2009229750A (en) * | 2008-03-21 | 2009-10-08 | Ricoh Co Ltd | Transfer device and image forming apparatus comprising the transfer device |
US8515310B2 (en) | 2008-03-26 | 2013-08-20 | Ricoh Company, Limited | Pressing mechanism, transfer device, and image forming apparatus |
JP2010134325A (en) * | 2008-12-08 | 2010-06-17 | Fuji Xerox Co Ltd | Transfer device and image forming apparatus including the same |
JP4650563B2 (en) * | 2008-12-08 | 2011-03-16 | 富士ゼロックス株式会社 | Transfer device and image forming apparatus having the same |
JP2011123388A (en) * | 2009-12-14 | 2011-06-23 | Fuji Xerox Co Ltd | Transfer device and image forming apparatus |
JP2015118164A (en) * | 2013-12-17 | 2015-06-25 | 富士ゼロックス株式会社 | Image forming apparatus and transfer device |
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