JP3309868B2 - Thermal cutoff device between fixing device and transfer device - Google Patents
Thermal cutoff device between fixing device and transfer deviceInfo
- Publication number
- JP3309868B2 JP3309868B2 JP03671893A JP3671893A JP3309868B2 JP 3309868 B2 JP3309868 B2 JP 3309868B2 JP 03671893 A JP03671893 A JP 03671893A JP 3671893 A JP3671893 A JP 3671893A JP 3309868 B2 JP3309868 B2 JP 3309868B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- transfer
- peeling
- image
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Accessory Devices And Overall Control Thereof (AREA)
- Fixing For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、プリンタ、フ
ァクシミリ等の画像形成装置において、転写材担持体
（転写材保持手段）を用いる転写装置と加熱式定着装置
間の熱遮断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal cut-off device between a transfer device using a transfer material carrier (transfer material holding means) and a heating type fixing device in an image forming apparatus such as a copying machine, a printer, and a facsimile.
【０００２】[0002]
【従来の技術】従来、例えば、カラー電子写真複写機に
おいて、像担持体上に順次、イェロー、シアン、マゼン
ダ、ブラックの潜像を形成し、それぞれの潜像をイェロ
ー、シアン、マゼンダ、ブラックの現像器で現像し、現
像されたトナー像を像担持体に接して回転する転写ドラ
ム上の転写材に転写し、転写ドラムを４回回転させて４
色のトナー像を転写材に重ね合わせて転写し、４色フル
カラーコピーを得る方式が知られている。2. Description of the Related Art Conventionally, for example, in a color electrophotographic copying machine, latent images of yellow, cyan, magenta and black are sequentially formed on an image carrier, and the latent images of yellow, cyan, magenta and black are sequentially formed. The developed toner image is developed by a developing device, and the developed toner image is transferred to a transfer material on a rotating transfer drum in contact with the image carrier, and the transfer drum is rotated four times.
There is known a method in which a color toner image is superimposed on a transfer material and transferred to obtain a four-color full-color copy.
【０００３】上記画像形成装置の転写装置においては、
一枚の転写材上に高精度で画像を重ね合わせるために、
転写ドラムの外周に誘電体フィルムからなる転写担持体
を固定し、この転写材担持体に転写材を静電吸着させ、
転写材を像担持体周面に密着させるようにして転写を行
い、転写終了後の転写材は除電コロトロンにより転写材
の電荷を除去し、剥離爪により剥離させるようにしてい
る。In the transfer device of the above image forming apparatus,
To superimpose images on a single transfer material with high accuracy,
A transfer carrier made of a dielectric film is fixed to the outer periphery of the transfer drum, and the transfer material is electrostatically attracted to the transfer material carrier,
The transfer is performed such that the transfer material is brought into close contact with the peripheral surface of the image carrier, and after the transfer is completed, the charge of the transfer material is removed by a charge removing corotron, and the transfer material is peeled by a peeling claw.
【０００４】ところで、上記転写材担持体を用いる転写
装置に加熱式定着装置とを組み合わせる画像形成装置に
おいては、定着装置からの熱伝導および輻射熱によって
転写材担持体が収縮或いは弛緩してしまい、転写材が平
滑な状態で転写部に搬送できなくなり画像品質が低下す
るという問題を有している。In an image forming apparatus in which a transfer device using the above-mentioned transfer material carrier and a heating type fixing device are combined, the transfer material carrier contracts or relaxes due to heat conduction and radiant heat from the fixing device. There is a problem that the material cannot be transported to the transfer section in a smooth state, and the image quality is reduced.
【０００５】従来、この問題を解決するために、特開平
１−３０３４６３号公報や実開昭６３−２０１７２号公
報に示すように、転写材担持体を雰囲気温度より高い温
度で一定に維持する手段を設けたり、局所的な転写材担
持体の変形を避けるため、転写担持体を常時回転させた
り、定着装置と転写装置との距離を転写材担持体が定着
装置からの熱の影響を受けない位置まで遠ざけたりして
いるが、装置の大型化を招いたり加熱手段を設けなくは
ならないという欠点を有している。Conventionally, in order to solve this problem, as disclosed in JP-A-1-303463 and JP-A-63-20172, means for maintaining the transfer material carrier constant at a temperature higher than the ambient temperature is known. In order to avoid the local deformation of the transfer material carrier, the transfer material is constantly rotated, and the distance between the fixing device and the transfer device is not affected by the heat from the fixing device. Although they are distant to the position, they have drawbacks in that they increase the size of the apparatus and require the provision of heating means.
【０００６】これを解決するために特開昭６１−１４７
２７６号公報においては、定着装置の入口側を開閉する
開閉手段を設け、転写材の定着時以外は開閉手段により
定着装置の入口側を閉鎖する方式を提案している。To solve this problem, Japanese Patent Laid-Open Publication No.
Japanese Patent Publication No. 276 proposes a method in which an opening / closing means for opening and closing the entrance side of the fixing device is provided, and the entrance side of the fixing device is closed by the opening / closing means except when the transfer material is fixed.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記特
開昭６１−１４７２７６号公報における方式において
は、定着装置の入口側を開閉する開閉板と、この開閉板
を動作させるためのソレノイドを設けなければならず、
構造が複雑となりコストも増大するという問題を有して
いる。However, in the system disclosed in Japanese Patent Application Laid-Open No. 61-147276, an opening and closing plate for opening and closing the entrance side of the fixing device and a solenoid for operating the opening and closing plate must be provided. Not
There is a problem that the structure becomes complicated and the cost increases.
【０００８】本発明は、上記問題を解決するものであっ
て、特別の部材および装置を設けることなく簡単な構成
により、転写材保持手段の変形を防止することができる
とともに、定着装置と転写装置間の距離を短縮可能にし
て装置の小型化を図ることができる熱遮断装置を提供す
ることを目的とする。The present invention solves the above-mentioned problem, and it is possible to prevent the transfer material holding means from being deformed by a simple structure without providing special members and devices, and to provide a fixing device and a transfer device. It is an object of the present invention to provide a heat shut-off device that can reduce the distance between the heat shut-off devices and reduce the size of the device.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項１記載の定着装置と転写装置間の熱
遮断装置は、像担持体と、該像担持体に静電潜像を形成
する像形成手段と、前記静電潜像をトナー像に現像する
現像手段と、誘電体フィルムからなる転写材担持体上に
転写材を静電吸着させ、前記像担持体上に形成されたト
ナー像を転写材上に転写するための転写装置と、前記転
写材担持体から転写材を剥離するための剥離装置と、該
剥離装置の横方向近傍に配置され、転写されたトナー像
を加熱定着する定着装置とを備える画像形成装置におい
て、前記剥離装置は、回動軸に回動自在に取り付けられ
る支持体と、前記回動軸に固定される剥離爪と、該剥離
爪の両側で前記支持体に沿って延設され支持体に固定さ
れる剥離ガイド部材を有し、前記剥離爪と剥離ガイド部
材を転写材担持体に近接して転写材を剥離させる位置
と、前記支持体と剥離ガイド部材を定着装置の入口側開
口部方向に転写材担持体から離間させ、前記支持体と剥
離ガイド部材により定着装置からの熱を遮る位置とに回
動可能に配設されることを特徴とする。According to a first aspect of the present invention, there is provided a heat interrupting device between a fixing device and a transfer device. Image forming means for forming an image, developing means for developing the electrostatic latent image into a toner image, and electrostatically adsorbing a transfer material onto a transfer material carrier made of a dielectric film to form the image on the image carrier A transfer device for transferring the transferred toner image onto a transfer material, a separating device for separating the transfer material from the transfer material carrier, and a transferred toner image disposed in the vicinity of the peeling device in a lateral direction. And a fixing device for heat-fixing the fixing device, wherein the peeling device is rotatably attached to a rotating shaft.
A supporting member, a peeling claw fixed to the rotating shaft,
Extending along the support on both sides of the nail and fixed to the support
A position at which the peeling claw and the peeling guide member are brought close to the transfer material carrier to peel the transfer material, and the support and the peeling guide member are transferred in the direction of the opening on the entrance side of the fixing device. Separated from the material carrier and peeled off from the support.
It is characterized by being rotatably disposed at a position where heat from the fixing device is blocked by a separation guide member .
【００１０】[0010]
【作用】本発明においては、転写装置の転写時には、剥
離装置が転写材保持手段から離れ、定着装置の入口側開
口部を熱的に遮断する位置に待機され、この状態では、
入口側開口部から転写材保持手段に向かう輻射熱は、剥
離装置により遮断されるとともに、必要に応じてその熱
は吸引ダクトを介して排出される。In the present invention, at the time of transfer of the transfer device, the peeling device is separated from the transfer material holding means, and stands by at a position where the opening on the inlet side of the fixing device is thermally blocked.
The radiant heat from the entrance-side opening toward the transfer material holding means is cut off by the peeling device, and the heat is discharged through a suction duct as needed.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。図１、図２および図３は、本発明における熱遮
断装置をカラー電子写真複写機に適用した実施例を示
し、図１（Ａ）は図２における定着装置と転写装置間の
拡大断面図、図１（Ｂ）、図１（Ｃ）は剥離装置の作用
を説明するための拡大側面図、図２は全体構成図、図３
は本発明に係わる剥離装置の１実施例を示し、図３
（Ａ）は平面図、図３（Ｂ）は転写ドラムを含む正面図
である。なお、本発明はかかるカラー電子写真複写機に
限定されるものではなく、誘電体フィルムからなる転写
材担持体（転写材保持手段）を用いる転写装置と加熱式
定着装置とを備える方式の全ての画像形成装置に適用で
きるものである。Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1, 2 and 3 show an embodiment in which the heat shut-off device according to the present invention is applied to a color electrophotographic copying machine. FIG. 1 (A) is an enlarged sectional view between the fixing device and the transfer device in FIG. 1B and 1C are enlarged side views for explaining the operation of the peeling device, FIG. 2 is an overall configuration diagram, and FIG.
FIG. 3 shows one embodiment of the peeling device according to the present invention, and FIG.
3A is a plan view, and FIG. 3B is a front view including a transfer drum. Note that the present invention is not limited to such a color electrophotographic copying machine, and all of the systems including a transfer device using a transfer material carrier (transfer material holding means) made of a dielectric film and a heating type fixing device are used. It can be applied to an image forming apparatus.
【００１２】図２において、カラー電子写真複写機は、
自動原稿供給装置１、画像入力部２、画像出力部３及び
転写材供給部４からなる。カラー原稿は、自動原稿供給
装置１によりプラテンガラス５上に載置される。画像入
力部２は、イメージングユニット６、該ユニットを駆動
するためのワイヤ７、駆動プーリ９等からなり、イメー
ジングユニット６内のＣＣＤラインセンサ、カラーフィ
ルタを用いて、４色フルカラーの場合には、カラー原稿
を光の原色であるＢ（青）、Ｇ（緑）、Ｒ（赤）毎に読
みとり、デジタル画像信号に変換した後、この信号をト
ナーの原色であるＹ（イェロー）、Ｃ（シアン）、Ｍ
（マゼンダ）、Ｋ（ブラック）に変換し、さらに、色、
階調、精細度等の再現性を高めるために、種々のデータ
処理を施してカラーの階調トナー信号をオン／オフの２
値化信号に変換して画像出力部３に出力する。In FIG. 2, a color electrophotographic copying machine is
It comprises an automatic document feeder 1, an image input unit 2, an image output unit 3, and a transfer material supply unit 4. The color document is placed on the platen glass 5 by the automatic document feeder 1. The image input unit 2 includes an imaging unit 6, a wire 7 for driving the unit, a drive pulley 9, and the like. Using a CCD line sensor and a color filter in the imaging unit 6, in the case of four full colors, A color original is read for each of B (blue), G (green), and R (red), which are the primary colors of light, and is converted into a digital image signal. Then, this signal is converted to a primary color of toner, Y (yellow), C (cyan) ), M
(Magenta), K (black), and color,
In order to enhance the reproducibility of gradation, definition, etc., various data processing is performed to turn on / off the color gradation toner signal.
The signal is converted into a value signal and output to the image output unit 3.
【００１３】画像出力部３は、スキャナ１０、有機感光
体からなるドラム形状の像担持体１１を有し、像担持体
１１の周囲には、像担持体１１に一様に帯電させるため
の帯電器１２、静電潜像をトナー像に現像させるための
現像器ユニット１３、トナー像を転写材に転写させるた
めの転写装置１４、転写されなかった残留トナーを回収
するためのクリーナ１５が配置され、像担持体１１は電
動モータにより図示矢印の如く回転駆動される。The image output unit 3 includes a scanner 10 and a drum-shaped image carrier 11 made of an organic photoreceptor. Around the image carrier 11, a charging device for uniformly charging the image carrier 11 is provided. A developing device unit 13 for developing the electrostatic latent image into a toner image, a transfer device 14 for transferring the toner image to a transfer material, and a cleaner 15 for collecting untransferred residual toner. The image carrier 11 is driven to rotate by an electric motor as shown by the arrow in the figure.
【００１４】スキャナ１０のレーザ出力部１０ａにおい
て、前記画像入力部２からの例えばイェローの画像信号
を光信号に変換し、ポリゴンミラー１０ｂ、ｆ／θレン
ズ１０ｃ及び反射ミラー１０ｄを介して像担持体１１上
に原稿画像に対応した潜像を形成させる。このイェロー
の潜像が現像を経て転写材に転写されれば、像担持体１
１はクリーナ１５により残留トナーが除去された後、再
び帯電器１２により帯電され、レーザ出力部１０ａは、
シアンの画像信号を出力する。以下、マゼンダ、ブラッ
クの各画像信号の潜像を順番に形成させる。The laser output unit 10a of the scanner 10 converts, for example, a yellow image signal from the image input unit 2 into an optical signal, and transmits the image signal via a polygon mirror 10b, an f / θ lens 10c and a reflection mirror 10d. A latent image corresponding to the document image is formed on the image 11. When the yellow latent image is transferred to a transfer material through development, the image carrier 1
1 is charged again by the charger 12 after the residual toner is removed by the cleaner 15, and the laser output unit 10a
Outputs a cyan image signal. Hereinafter, latent images of magenta and black image signals are sequentially formed.
【００１５】現像器ユニット１３は、イェロー用現像器
１３Ｙ、シアン用現像器１３Ｃ、マゼンダ用現像器１３
Ｍ、ブラック用現像器１３Ｋを有し、各現像器は回転軸
の周囲に配設されている。そして、例えばイェローのト
ナー像を形成するときは、図の位置でイェロー用現像器
１３Ｙにより現像を行い、シアンのトナー像を形成する
ときは、現像器ユニット１３を回転させて、像担持体１
１に接する位置にシアン用現像器１３Ｃを配置させる。
マゼンダ、ブラックの現像も同様にして動作させる。The developing unit 13 includes a yellow developing unit 13Y, a cyan developing unit 13C, and a magenta developing unit 13C.
M and black developing units 13K, and each developing unit is disposed around a rotation axis. For example, when a yellow toner image is formed, development is performed by the yellow developing device 13Y at the position shown in the figure, and when a cyan toner image is formed, the developing device unit 13 is rotated and the image carrier 1 is rotated.
The developing device 13C for cyan is disposed at a position in contact with 1.
Magenta and black development are operated in the same manner.
【００１６】転写材搬送装置としての転写ドラム１６の
外周には、誘電体のフィルムからなる転写材担持体（後
述）が張られており、転写ドラム１６は、専用の電動モ
ータ或いは像担持体１１と歯車によって連結され、図示
矢印の如く回転駆動される。転写ドラム１６の内部およ
び外側周囲には、転写コロトロン１７、押圧部材１８、
分離コロトロン１９、剥離装置３１、除電コロトロン２
１、クリーナ２２、吸着ロール２３、吸着コロトロン２
５が配置されている。A transfer material carrier (to be described later) made of a dielectric film is stretched around the outer periphery of the transfer drum 16 as a transfer material transport device. The transfer drum 16 is provided with a dedicated electric motor or image carrier 11. And are connected by gears, and are rotationally driven as shown by the arrows in the figure. A transfer corotron 17, a pressing member 18,
Separation corotron 19, peeling device 31, neutralizing corotron 2
1, cleaner 22, suction roll 23, suction corotron 2
5 are arranged.
【００１７】そして、転写材供給部４の給紙トレイ４ａ
〜４ｄから搬送ローラ２６、給紙ガイド２７およびレジ
ストローラ２８を経て搬送、給紙される転写材は、吸着
ロール２３および吸着コロトロン２５の間に搬送され転
写材担持体に吸着される。転写ドラム１６は、像担持体
１１と同期して回転しており、例えば、イェローで現像
されたトナー像が転写コロトロン１７により転写材に転
写され転写装置１回転後、シアンで現像されたトナー像
が転写コロトロン１７により転写材に転写され、以下順
次他の色が重ね合わせられて転写される。転写ドラム１
６が４回転し４色の転写が終了すると、転写材は分離コ
ロトロン１９により除電されるとともに剥離装置３１に
より分離され、定着器３０に送られる。定着器３０は加
熱ロール３０ａと加圧ロール３０ｂとからなり転写材の
トナー像が溶融定着される。以下この一連のコピーサイ
クルが繰り返される。The paper feed tray 4a of the transfer material supply unit 4
The transfer material conveyed and fed from 4 to 4d via the conveyance roller 26, the paper feed guide 27, and the registration roller 28 is conveyed between the suction roll 23 and the suction corotron 25 and is adsorbed on the transfer material carrier. The transfer drum 16 rotates in synchronization with the image carrier 11. For example, a toner image developed by yellow is transferred to a transfer material by a transfer corotron 17, and after one rotation of the transfer device, a toner image developed by cyan Is transferred onto a transfer material by the transfer corotron 17, and thereafter, other colors are sequentially superimposed and transferred. Transfer drum 1
When the transfer of the four colors is completed by the rotation of 6, the transfer material is discharged by the separation corotron 19, separated by the peeling device 31, and sent to the fixing device 30. The fixing device 30 includes a heating roll 30a and a pressure roll 30b, and fuses and fixes the toner image on the transfer material. Hereinafter, this series of copy cycles is repeated.
【００１８】図３は本発明に係わる剥離装置の１実施例
を示し、図３（Ａ）は平面図、図３（Ｂ）は転写ドラム
を含む正面図である。なお、本発明はかかる剥離装置に
限定されるものではなく、従来からある剥離装置のうち
定着装置からの熱を遮断できる構成の剥離装置であれば
よい。FIG. 3 shows an embodiment of the peeling device according to the present invention, FIG. 3 (A) is a plan view, and FIG. 3 (B) is a front view including a transfer drum. The present invention is not limited to such a peeling device, but may be any conventional peeling device having a configuration capable of blocking heat from the fixing device.
【００１９】転写ドラム１６は、フレーム３５に回転自
在に軸支され、この転写ドラム１６に近接して剥離装置
３１が配設されている。転写ドラム１６は、両側に設け
られる筒部材３２と、これら筒部材３２の間に連結固定
される連結部材３３と、誘電体フィルムからなる転写材
担持体３４とを備え、転写材担持体３４の側端縁部を両
面接着テープ等により筒部材３２の外周面に沿って固定
させ、転写材担持体３４の前端縁部および後端縁部を連
結部材３３に固定させ、内部に中空円筒状の空間を形成
している。The transfer drum 16 is rotatably supported by a frame 35, and a peeling device 31 is provided near the transfer drum 16. The transfer drum 16 includes cylindrical members 32 provided on both sides, a connecting member 33 connected and fixed between the cylindrical members 32, and a transfer material carrier 34 made of a dielectric film. The side edges are fixed along the outer peripheral surface of the tubular member 32 with a double-sided adhesive tape or the like, the front edge and the rear edge of the transfer material carrier 34 are fixed to the connecting member 33, and a hollow cylindrical shape is formed inside. It forms a space.
【００２０】また、剥離装置３１は、フレーム３５に回
転自在に軸支される回動軸３６と、回動軸３６に回動自
在に取り付けられる支持体３７と、支持体３７の中央部
から若干離れる位置で回動軸３６に固定される剥離爪２
０と、剥離爪２０の両側に位置し支持体３７に固定され
る剥離ガイド部材３８と、回動軸３６の一端に取り付け
られる案内ローラ３９と、この案内ローラ３９と反対側
で支持体３７に取り付けられる案内ローラ４０とからな
る。The peeling device 31 includes a rotating shaft 36 rotatably supported by the frame 35, a supporting member 37 rotatably mounted on the rotating shaft 36, and a small portion from the center of the supporting member 37. Peeling claw 2 fixed to rotating shaft 36 at a position away from it
0, a peeling guide member 38 positioned on both sides of the peeling claw 20 and fixed to the support 37, a guide roller 39 attached to one end of the rotating shaft 36, and a support 37 on the opposite side to the guide roller 39. And a guide roller 40 to be attached.
【００２１】回動軸３６の一端には、作動アーム４１が
取り付けられ、作動アーム４１とフレーム３５間には、
スプリング４２が張設され、これにより剥離爪２０およ
び支持体３７、剥離ガイド部材３８を図Ａにおいて手前
側に回動するように付勢している。また、作動アーム４
１とフレーム３５間には、ソレノイド４３が配設され、
これにより剥離爪２０および剥離ガイド部材３８を図Ｂ
において手前側に回動可能にしている。上記構成によ
り、ソレノイド４３がオフのときは、剥離爪２０と剥離
ガイド部材３８は、ともにスプリング４２により転写ド
ラム１６から離れた位置すなわち定着装置３０からの輻
射熱を遮る位置に待機しており、ソレノイド４３がオン
すると、剥離爪２０は回動軸３６の回転に伴って転写材
担持体３４上の転写材の下に侵入可能にされ、剥離ガイ
ド部材３８は、剥離爪２０の上方で待機可能にされる。An operating arm 41 is attached to one end of the rotating shaft 36, and between the operating arm 41 and the frame 35,
A spring 42 is stretched, thereby urging the peeling claw 20, the support 37, and the peeling guide member 38 to rotate to the near side in FIG. In addition, the operating arm 4
A solenoid 43 is disposed between the frame 1 and the frame 35,
As a result, the peeling claw 20 and the peeling guide member 38 are
At the front side. With the above configuration, when the solenoid 43 is off, the peeling claw 20 and the peeling guide member 38 are both on standby at a position distant from the transfer drum 16 by the spring 42, that is, at a position where the radiant heat from the fixing device 30 is blocked. When 43 is turned on, the peeling claw 20 is allowed to enter below the transfer material on the transfer material carrier 34 with the rotation of the rotation shaft 36, and the peeling guide member 38 is allowed to stand by above the peeling claw 20. Is done.
【００２２】一方、転写ドラム１６の連結部材３３には
剥離爪２０に対向して剥離爪２０が入り込む逃げ溝４４
が形成され、一方の筒部材３２には前記案内ローラ３９
が入り込む案内溝４５が形成されている。剥離ガイド部
材３８は、図Ａに示すように、前面に傾斜面４６が一体
に形成され、後方にリブ４７を有し、傾斜面４６は、剥
離爪２０から遠ざかるに従い後方に退却するように形成
され、また、図Ｂに示すように、剥離爪２０から遠ざか
るに従い高さが低くなるように形成されている。On the other hand, in the connecting member 33 of the transfer drum 16, an escape groove 44 into which the peeling claw 20 enters so as to face the peeling claw 20.
Is formed, and the guide roller 39 is provided on one of the cylindrical members 32.
Are formed in the guide groove 45 into which the groove enters. As shown in FIG. A, the peeling guide member 38 has an inclined surface 46 integrally formed on the front surface and a rib 47 on the rear side. The inclined surface 46 is formed so as to retreat rearward as the distance from the peeling claw 20 increases. In addition, as shown in FIG. B, the height is reduced as the distance from the peeling claw 20 increases.
【００２３】図１（Ａ）は図２における定着装置３０と
転写装置１４間の拡大断面図である。剥離装置３１は、
定着装置３０の入口側開口部４８に対向して配設され
る。入口側開口部５０の下方には、転写材案内部材４９
および吸引ダクト２９ｂが設けられ、また、入口側開口
部４８の上方にも吸引ダクト２９ａが設けられ、吸引ダ
クト２９ａ、２９ｂは図示しないファンに接続され、剥
離装置３１と入口側開口部４８との間のエアを吸引し、
浮遊トナーおよび定着装置３０からの熱を吸引ダクト２
９ａ、２９ｂを介して排出可能にしている。FIG. 1A is an enlarged sectional view between the fixing device 30 and the transfer device 14 in FIG. The peeling device 31
The fixing device 30 is disposed so as to face the entrance-side opening 48. A transfer material guide member 49 is provided below the entrance-side opening 50.
And a suction duct 29b, and a suction duct 29a is also provided above the inlet-side opening 48. The suction ducts 29a and 29b are connected to a fan (not shown). Suck the air between
The suction duct 2 removes the floating toner and heat from the fixing device 30.
The discharge is possible through 9a and 29b.
【００２４】上記構成からなる本発明の作用について説
明する。転写ドラム１６が回転、停止を繰り返す転写時
には、ソレノイド４３がオフしており、スプリング４２
の弾性力により回動軸３６が回動し、剥離爪２０、支持
体３７および剥離ガイド部材３８は、図１（Ａ）に示す
ように、転写ドラム１６から離れ、支持体３７および剥
離ガイド部材３８は、定着装置３０の入口側開口部４８
を熱的に遮断する位置に待機される。この状態では、入
口側開口部４８から転写材担持体３４に向かう輻射熱
は、支持体３７および剥離ガイド部材３８により遮断さ
れるとともに、その熱は吸引ダクト２９ａ、２９ｂを介
して排出される。従って、特別の部材および装置を設け
ることなく簡単な構成により、転写材担持体３４の変形
を防止することができるとともに、定着装置３０と転写
装置１４間の距離を短縮できるため装置の小型化を図る
ことができる。The operation of the present invention having the above configuration will be described. At the time of transfer in which the transfer drum 16 repeatedly rotates and stops, the solenoid 43 is off and the spring 42
The peeling claw 20, the support 37, and the peeling guide member 38 are separated from the transfer drum 16 as shown in FIG. Reference numeral 38 denotes an entrance-side opening 48 of the fixing device 30.
At a position where the heat is shut off. In this state, radiant heat from the entrance-side opening 48 toward the transfer material carrier 34 is blocked by the support 37 and the separation guide member 38, and the heat is discharged through the suction ducts 29a and 29b. Therefore, the transfer material carrier 34 can be prevented from being deformed by a simple configuration without providing special members and devices, and the distance between the fixing device 30 and the transfer device 14 can be shortened. Can be planned.
【００２５】転写が終了し、転写材Ｐの剥離時には、ソ
レノイド４３を駆動し、回転軸３６が剥離爪２０および
支持体３７、剥離ガイド部材３８を転写ドラム１６に接
近する方向に回動させると、一方の案内ローラ４０が筒
部材３２に当接し、図１（Ｂ）に示す位置で待機させ
る。さらに転写ドラム１６が回転すると、他方の案内ロ
ーラ３９が筒部材３２に形成された案内溝４５に入り込
む。その結果、図１（Ｃ）に示すように、剥離ガイド部
材３８は停止した状態で剥離爪２０のみが回動し、剥離
爪２０の先端が転写材Ｐの先端をすくい上げ、転写材Ｐ
が転写材担持体３４から分離される。When the transfer is completed and the transfer material P is peeled, the solenoid 43 is driven, and the rotating shaft 36 rotates the peeling claw 20, the support 37, and the peeling guide member 38 in a direction approaching the transfer drum 16. The one guide roller 40 comes into contact with the cylindrical member 32, and waits at the position shown in FIG. When the transfer drum 16 further rotates, the other guide roller 39 enters the guide groove 45 formed in the cylindrical member 32. As a result, as shown in FIG. 1C, only the peeling claw 20 rotates with the peeling guide member 38 stopped, and the tip of the peeling claw 20 scoops up the tip of the transfer material P, and the transfer material P
Is separated from the transfer material carrier 34.
【００２６】剥離爪２０により転写材Ｐが分離される
と、直ちに剥離爪２０は図１（Ｂ）の待機位置に戻る。
このとき、剥離ガイド部材３８は回動しないため、先端
部を極力転写ドラム１６へ近づけることができ、良好な
剥離性能を得ることができる。転写材が通過後、剥離爪
２０は、ソレノイド４３のオフにより図１（Ａ）の位置
へ戻され、これと同期して支持体３７および剥離ガイド
部材３８も転写ドラム１６より離れ、再び、支持体３７
および剥離ガイド部材３８は、定着装置３０の入口側開
口部４８から転写材担持体３４に向かう輻射熱を遮断
し、次の転写サイクルに備える。As soon as the transfer material P is separated by the separating claw 20, the separating claw 20 returns to the standby position shown in FIG.
At this time, since the peeling guide member 38 does not rotate, the leading end can be brought as close to the transfer drum 16 as possible, and good peeling performance can be obtained. After the transfer material has passed, the peeling claw 20 is returned to the position shown in FIG. 1A by turning off the solenoid 43, and in synchronization with this, the support 37 and the peeling guide member 38 also separate from the transfer drum 16 and are again supported. Body 37
The peeling guide member 38 blocks radiant heat from the entrance opening 48 of the fixing device 30 toward the transfer material carrier 34, and prepares for the next transfer cycle.
【００２７】なお、転写材の剥離時には、定着装置３０
の入口側開口部４８から転写材担持体３４に一時的に輻
射熱が伝達されるが、転写ドラム１６が回転しているた
め、転写材担持体３４が局所的に変形することはない。When the transfer material is peeled off, the fixing device 30
The radiant heat is temporarily transmitted to the transfer material carrier 34 from the entrance opening 48 of the transfer material, but the transfer material carrier 34 is not locally deformed because the transfer drum 16 is rotating.
【００２８】図４は本発明の他の実施例を示し、転写材
担持体として転写ベルトを用いる実施例である。なお、
前記実施例と同一の構成については同一番号を付けて説
明を省略する。転写装置１４を構成する転写ベルト５０
は、無端ベルト状の誘電体フィルムを備え、駆動ロール
５１および従動ロール５２に巻回され、矢印方向に回動
される。転写ベルト５０に対向して、ブラック用、イェ
ロー用、マゼンタ用、シアン用の４組の画像形成ユニッ
トＫ、Ｙ、Ｍ、Ｃが配設され、転写ベルト５０の１回転
で４色のトナー像が次々に多重転写される。FIG. 4 shows another embodiment of the present invention, in which a transfer belt is used as a transfer material carrier. In addition,
The same components as those of the above embodiment are denoted by the same reference numerals, and description thereof is omitted. Transfer belt 50 constituting transfer device 14
Is provided with a dielectric film in the form of an endless belt, is wound around a drive roll 51 and a driven roll 52, and is turned in the direction of the arrow. Four image forming units K, Y, M, and C for black, yellow, magenta, and cyan are provided to face the transfer belt 50, and four color toner images are formed by one rotation of the transfer belt 50. Are transcribed one after another.
【００２９】[0029]
【発明の効果】以上の説明から明らかなように本発明に
よれば、特別の部材および装置を設けることなく簡単な
構成により、転写材保持手段の変形を防止することがで
きるとともに、定着装置と転写装置間の距離を短縮可能
にして装置の小型化を図ることができる。As is apparent from the above description, according to the present invention, the transfer material holding means can be prevented from being deformed by a simple structure without providing any special members and devices, and the fixing device and the fixing device can be prevented. The distance between the transfer devices can be reduced, and the size of the device can be reduced.
【図１】本発明における熱遮断装置の１実施例を示し、
図１（Ａ）は図２における定着装置と転写装置間の拡大
断面図、図１（Ｂ）、図１（Ｃ）は剥離装置の作用を説
明するための拡大側面図である。FIG. 1 shows an embodiment of a heat shut-off device according to the present invention,
FIG. 1A is an enlarged cross-sectional view between the fixing device and the transfer device in FIG. 2, and FIGS. 1B and 1C are enlarged side views for explaining the operation of the peeling device.
【図２】本発明における熱遮断装置をカラー電子写真複
写機に適用した実施例を示す全体構成図である。FIG. 2 is an overall configuration diagram showing an embodiment in which the heat blocking device according to the present invention is applied to a color electrophotographic copying machine.
【図３】本発明に係わる剥離装置の１実施例を示し、図
３（Ａ）Ａは平面図、図３（Ｂ）は転写ドラムを含む正
面図である。3A and 3B show one embodiment of a peeling device according to the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a front view including a transfer drum.
【図４】本発明の他の実施例を示し、転写材担持体とし
て転写ベルトを用いる実施例である。FIG. 4 shows another embodiment of the present invention, in which a transfer belt is used as a transfer material carrier.
１１…像担持体、１０、１２…像形成手段、１３…現像
手段、１４…転写装置 １６…転写ドラム、２０…剥離爪、２９ａ、２９ｂ…吸
引ダクト ３０…定着装置、３１…剥離装置、３４…転写材担持体 ３８…剥離ガイド部材、４８…入口側開口部、５０…転
写ドラム、Ｐ…転写材DESCRIPTION OF SYMBOLS 11 ... Image carrier, 10 and 12 ... Image forming means, 13 ... Developing means, 14 ... Transfer device 16 ... Transfer drum, 20 ... Peeling claw, 29a, 29b ... Suction duct 30 ... Fixing device, 31 ... Peeling device, 34 ... Transfer material carrier 38 ... Separation guide member, 48 ... Inlet side opening, 50 ... Transfer drum, P ... Transfer material
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−27609（ＪＰ，Ａ) 特開 平２−238480（ＪＰ，Ａ) 特開 平１−254986（ＪＰ，Ａ) 特開 平４−337750（ＪＰ，Ａ) 特開 平５−173394（ＪＰ，Ａ) 特開 平４−313783（ＪＰ，Ａ) 特開 平５−61364（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/00 G03G 15/14 - 15/16 G03G 15/20 G03G 21/00 G03G 21/16 - 21/20 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-27609 (JP, A) JP-A-2-238480 (JP, A) JP-A 1-254986 (JP, A) JP-A-4-249 337750 (JP, A) JP-A-5-173394 (JP, A) JP-A-4-313783 (JP, A) JP-A-5-61364 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G03G 15/00 G03G 15/14-15/16 G03G 15/20 G03G 21/00 G03G 21/16-21/20
Claims (1)
する像形成手段と、前記静電潜像をトナー像に現像する
現像手段と、誘電体フィルムからなる転写材担持体上に
転写材を静電吸着させ、前記像担持体上に形成されたト
ナー像を転写材上に転写するための転写装置と、前記転
写材担持体から転写材を剥離するための剥離装置と、該
剥離装置の横方向近傍に配置され、転写されたトナー像
を加熱定着する定着装置とを備える画像形成装置におい
て、 前記剥離装置は、回動軸に回動自在に取り付けられる支
持体と、前記回動軸に固定される剥離爪と、該剥離爪の
両側で前記支持体に沿って延設され支持体に固定される
剥離ガイド部材を有し、前記剥離爪と剥離ガイド部材を
転写材担持体に近接して転写材を剥離させる位置と、前
記支持体と剥離ガイド部材を定着装置の入口側開口部方
向に転写材担持体から離間させ、前記支持体と剥離ガイ
ド部材により定着装置からの熱を遮る位置とに回動可能
に配設されることを特徴とする定着装置と転写装置間の
熱遮断装置。1. An image carrier, an image forming means for forming an electrostatic latent image on the image carrier, a developing means for developing the electrostatic latent image into a toner image, and a transfer material carrier comprising a dielectric film A transfer device for electrostatically adsorbing a transfer material on a body and transferring a toner image formed on the image carrier onto the transfer material, and a peeling device for peeling the transfer material from the transfer material carrier And a fixing device which is disposed in the vicinity of the peeling device in the lateral direction and heat-fixes the transferred toner image, wherein the peeling device is rotatably mounted on a rotating shaft.
Holding body, a peeling claw fixed to the rotating shaft,
Extends along the support on both sides and is fixed to the support
A separation guide member, a position where the separation claw and the separation guide member are brought close to the transfer material carrier to separate the transfer material, and the support member and the separation guide member are moved in the direction of the opening side of the entrance side of the fixing device. Separated from the carrier , the support and the release guide
A heat blocking device between the fixing device and the transfer device, the device being rotatably disposed at a position where the heat from the fixing device is blocked by a fixing member .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03671893A JP3309868B2 (en) | 1993-02-25 | 1993-02-25 | Thermal cutoff device between fixing device and transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03671893A JP3309868B2 (en) | 1993-02-25 | 1993-02-25 | Thermal cutoff device between fixing device and transfer device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06250531A JPH06250531A (en) | 1994-09-09 |
| JP3309868B2 true JP3309868B2 (en) | 2002-07-29 |
Family
ID=12477536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03671893A Expired - Fee Related JP3309868B2 (en) | 1993-02-25 | 1993-02-25 | Thermal cutoff device between fixing device and transfer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3309868B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100341807B1 (en) * | 1998-12-30 | 2002-10-31 | 삼성전자 주식회사 | Thermal Cut-Off Structure of Printer |
| JP2014102286A (en) * | 2012-11-16 | 2014-06-05 | Konica Minolta Inc | Image forming apparatus |
-
1993
- 1993-02-25 JP JP03671893A patent/JP3309868B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06250531A (en) | 1994-09-09 |
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