JPH08314290A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH08314290A JPH08314290A JP7145398A JP14539895A JPH08314290A JP H08314290 A JPH08314290 A JP H08314290A JP 7145398 A JP7145398 A JP 7145398A JP 14539895 A JP14539895 A JP 14539895A JP H08314290 A JPH08314290 A JP H08314290A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- intermediate transfer
- separation
- image forming
- transfer body
- 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.)
- Granted
Links
Landscapes
- Color Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、中間転写体を備えた画
像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus having an intermediate transfer member.
【０００２】[0002]
【従来の技術】複写機などの画像形成装置では、感光体
ドラムに形成されたトナー像が、紙転写体に転写され定
着されて画像形成が行われるが、一般には、感光体ドラ
ム表面に紙転写体を密着させ、その裏面からコロトロン
で放電して転写を行ったり、バイアス電圧を印加したロ
ーラで、紙転写体を感光体表面に圧接して転写を行って
いた。2. Description of the Related Art In an image forming apparatus such as a copying machine, a toner image formed on a photosensitive drum is transferred onto a paper transfer body and fixed to form an image. The transfer body is brought into close contact, and the back surface of the transfer body is discharged by a corotron to perform transfer, or the paper transfer body is pressed against the surface of the photoconductor with a roller to which a bias voltage is applied to perform transfer.
【０００３】しかし、これらの方法では、転写後に感光
体ドラム表面から紙転写体を剥離する必要があり、この
剥離時に感光体ドラムの表面を損傷したり、剥離不良状
態となって紙詰まりを起こすことがあった。However, in these methods, it is necessary to peel off the paper transfer member from the surface of the photoconductor drum after the transfer, and at the time of this peeling, the surface of the photoconductor drum is damaged, or the peeling failure occurs and paper jam occurs. There was an occasion.
【０００４】そこで、中間転写体を設け、感光体ドラム
上のトナー像を一旦中間転写体に転写し、中間転写体に
中間転写されたトナー像を、中間転写体から紙転写体に
転写する画像形成装置が用いられるようになり、紙転写
体の剥離時の感光体ドラム表面の損傷と紙詰まりの問題
は解決されている。Therefore, an image is formed in which an intermediate transfer member is provided, the toner image on the photosensitive drum is once transferred to the intermediate transfer member, and the toner image intermediately transferred to the intermediate transfer member is transferred from the intermediate transfer member to the paper transfer member. Forming devices have come to be used, and the problems of damage to the surface of the photosensitive drum and paper jam when the paper transfer body is peeled off have been solved.
【０００５】ところで、中間転写体を備えた画像形成装
置では、感光体ドラムと同様に、中間転写体上の残存ト
ナーをクリーニングすることが、汚れのない高品質の画
像の形成には必要である。また、カラー画像を形成する
場合には、中間転写材上で、各色の画像位置を精度よく
一致させることが必要になる。By the way, in an image forming apparatus equipped with an intermediate transfer member, it is necessary to clean the residual toner on the intermediate transfer member in order to form a high-quality image free from dirt, like the photosensitive drum. . Further, when forming a color image, it is necessary to accurately match the image positions of the respective colors on the intermediate transfer material.
【０００６】後者の中間転写体上での各色画像位置の一
致のためには、回動移動時に弛みや変形の生じないよう
に中間転写体の材質や構成に配慮が加えられており、さ
らに、同一方向への回動が続けられるために発生する偏
り変形を避けるために、中間転写が終了する度に、中間
転写体を中間転写時とは逆方向に回動させることが行わ
れている。In the latter case, in order to match the image positions of the respective colors on the intermediate transfer body, consideration is given to the material and the structure of the intermediate transfer body so as to prevent loosening or deformation during the rotational movement. In order to avoid the biased deformation that occurs due to the continuous rotation in the same direction, the intermediate transfer body is rotated in the opposite direction to that during the intermediate transfer each time the intermediate transfer is completed.
【０００７】[0007]
【発明が解決しようとする課題】前述の中間転写体を備
えた従来の画像形成装置では、電源投入後において、画
像形成動作前に感光体ドラムと中間転写体の表面の残留
トナーをクリーニングする場合に、感光体ドラムと中間
転写体間及び中間転写体と紙転写体間が、離間状態にあ
ることを確認してクリーニング動作を開始しないと、接
触部での機械的摩擦によるダメージが発生すると共に、
完全なクリーニングが行われないという問題がある。In the conventional image forming apparatus having the above-mentioned intermediate transfer member, when the residual toner on the surfaces of the photosensitive drum and the intermediate transfer member is cleaned before the image forming operation after the power is turned on. In addition, if the cleaning operation is not started after confirming that the photosensitive drum and the intermediate transfer body are separated from each other and the intermediate transfer body and the paper transfer body are separated from each other, damage due to mechanical friction at the contact portion occurs. ,
There is a problem that complete cleaning is not performed.
【０００８】また、電源投入後に中間転写体が中間転写
方向とは逆方向に回動され、その位置から画像形成動作
が開始されるために、電源投入後速やかに画像形成動作
が開始されるわけでなく、動作開始準備の時間が必要で
あるという問題がある。Further, since the intermediate transfer member is rotated in the direction opposite to the intermediate transfer direction after the power is turned on and the image forming operation is started from that position, the image forming operation is started immediately after the power is turned on. However, there is a problem that it takes time to prepare for the operation start.
【０００９】本発明は、前述したようなこの種の画像形
成装置の現状に鑑みてなされたものであり、その目的
は、感光体ドラムと中間転写体のクリーニング動作と、
中間転写体の待機位置セットを含む画像形成動作前の前
処理が、感光体ドラムと中間転写体間及び中間転写体と
紙転写体間の接離の判定に基づいて、最適条件下で自動
的に行われる画像形成装置を提供することにある。The present invention has been made in view of the current state of the image forming apparatus of this kind as described above, and its object is to perform a cleaning operation for the photosensitive drum and the intermediate transfer member,
Pre-processing before the image forming operation including the standby position setting of the intermediate transfer body is automatically performed under the optimum conditions based on the judgment of contact and separation between the photoconductor drum and the intermediate transfer body and between the intermediate transfer body and the paper transfer body. Another object of the present invention is to provide an image forming apparatus.
【００１０】[0010]
【課題を解決するための手段】前記目的を達成するため
に、請求項１記載の発明は、感光体ドラムに対して、周
面の残存トナーをクリーニングし、除電後に均一に帯電
する第１の初期動作が施され、該第１の初期動作が施さ
れた前記感光体ドラムの周面に、被形成画像の潜像が形
成され、該潜像がトナー像に現像され、前記感光体ドラ
ムに接離自在な中間転写体に対して、残存トナーをクリ
ーニングする第２の初期動作が施され、該第２の初期動
作が施された前記中間転写体に、前記感光体ドラムのト
ナー像が中間転写され、前記中間転写体に転写されたト
ナー像が、前記中間転写体に接離自在な紙転写体に転写
され定着されて画像形成が行われる画像形成装置におい
て、前記感光体ドラムと前記中間転写体間の接離状態を
検知する第１の接離検知手段と、前記中間転写体と前記
紙転写体間の接離状態を検知する第２の接離検知手段
と、前記第１の接離検知手段及び前記第２の接離検知手
段の接離状態を確認する接離確認手段と、該確認手段の
確認結果に基づいて、画像形成動作を制御する制御手段
とを有することを特徴とするものである。In order to achieve the above-mentioned object, the invention according to claim 1 is a first aspect of the present invention, in which the residual toner on the peripheral surface of the photoconductor drum is cleaned and uniformly charged after charge elimination. An initial operation is performed, a latent image of an image to be formed is formed on the peripheral surface of the photosensitive drum subjected to the first initial operation, the latent image is developed into a toner image, and the latent image is formed on the photosensitive drum. A second initial operation for cleaning the residual toner is performed on the intermediate transfer body that can be contacted and separated, and the toner image on the photosensitive drum is intermediately transferred to the intermediate transfer body that has been subjected to the second initial operation. In the image forming apparatus, in which the toner image transferred and transferred to the intermediate transfer member is transferred to and fixed on a paper transfer member that can be brought into contact with and separated from the intermediate transfer member to form an image, The first contact for detecting the contact / separation state between the transfer bodies Detection means, second contact / separation detection means for detecting the contact / separation state between the intermediate transfer body and the paper transfer body, and contact / separation of the first contact / separation detection means and the second contact / separation detection means. It is characterized by having a contact / separation confirmation means for confirming the state and a control means for controlling the image forming operation based on the confirmation result of the confirmation means.
【００１１】同様に前記目的を達成するために、請求項
２記載の発明は、請求項１記載の発明において、制御手
段が、電源投入時に前記接離確認手段によって、前記第
１の接離検知手段及び前記第２の接離検知手段が、接触
状態を検出していると確認されると、前記感光体ドラム
と前記中間転写体間及び前記中間転写体と前記紙転写体
間を離間状態にすることを特徴とするものである。[0011] Similarly, in order to achieve the above-mentioned object, the invention according to claim 2 is the invention according to claim 1, in which the control means is configured to detect the first contact / separation by the contact / separation confirmation means when the power is turned on. When it is confirmed that the means and the second contact / separation detection means detect the contact state, the photosensitive drum and the intermediate transfer body are separated from each other, and the intermediate transfer body and the paper transfer body are separated from each other. It is characterized by doing.
【００１２】同様に前記目的を達成するために、請求項
３記載の発明は、請求項１記載の発明において、制御手
段が、前記接離確認手段によつて、前記第１の接離検知
手段が、離間状態を検知していることを確認後に、前記
第１の初期動作を実行することを特徴とするものであ
る。[0012] Similarly, in order to achieve the above object, the invention according to claim 3 is the invention according to claim 1, wherein the control means uses the contact / separation confirmation means to detect the first contact / separation means. However, after confirming that the separated state is detected, the first initial operation is executed.
【００１３】同様に前記目的を達成するために、請求項
４記載の発明は、請求項１記載の発明において、制御手
段が、前記接離確認手段によって、前記第１の接離検知
手段及び前記第２の接離検知手段が、離間状態を検知し
ていることを確認後に、前記第２の初期動作を実行する
ことを特徴とするものである。[0013] Similarly, in order to achieve the above-mentioned object, the invention according to claim 4 is the invention according to claim 1, wherein the control means causes the contact / separation confirmation means to detect the first contact / separation detection means and the The second contacting / separating detecting means executes the second initial operation after confirming that the separated state is detected.
【００１４】同様に前記目的を達成するために、請求項
５記載の発明は、請求項１記載の発明において、制御手
段が、前記接離確認手段によって、前記第１の接離検知
手段及び前記第２の接離検知手段が、離間状態を検知し
ていることを確認後に、画像形成動作を実行することを
特徴とするものである。[0014] Similarly, in order to achieve the above-mentioned object, the invention according to claim 5 is the invention according to claim 1, wherein the control means causes the contact / separation confirmation means to perform the first contact / separation detection means and the contact / separation detection means. The second contact / separation detection unit executes the image forming operation after confirming that the separated state is detected.
【００１５】同様に前記目的を達成するために、請求項
６記載の発明は、請求項１記載の発明において、制御手
段が、画像形成動作終了毎に、前記感光体ドラムと前記
中間転写体間及び前記中間転写体と前記紙転写体間を離
間状態にすることを特徴とするものである。Similarly, in order to achieve the above-mentioned object, in the invention according to claim 6, in the invention according to claim 1, the control means is arranged such that the image forming operation is completed between the photosensitive drum and the intermediate transfer body. Further, the intermediate transfer body and the paper transfer body are separated from each other.
【００１６】同様に前記目的を達成するために、請求項
７記載の発明は、請求項１記載の発明において、制御手
段が、ジャム処理を含む異常処理終了後に、前記感光体
ドラムと前記中間転写体間及び前記中間転写体と前記紙
転写体間を離間状態にすることを特徴とするものであ
る。[0016] Similarly, in order to achieve the above-mentioned object, the invention according to claim 7 is the invention according to claim 1, in which the control means performs the intermediate transfer including the photosensitive drum after the abnormal processing including the jam processing is completed. It is characterized in that the space between the bodies and the space between the intermediate transfer body and the paper transfer body are separated from each other.
【００１７】[0017]
【作用】請求項１記載の発明では、感光体ドラムに対し
て、周面の残存トナーをクリーニングし、除電後に均一
に帯電する第１の初期動作と、感光体ドラムに接離自在
な中間転写体に対して、残存トナーをクリーニングする
第２の初期動作とが施され、第１の初期動作が施された
感光体ドラムの周面に、被形成画像の潜像が形成され、
該潜像がトナー像に現像され、第２の初期動作が施され
た中間転写体に、感光体ドラムのトナー像が中間転写さ
れ、中間転写体に転写されたトナー像が、中間転写体に
接離自在な紙転写体に転写され定着されて画像形成が行
われる。According to the first aspect of the present invention, the first initial operation of cleaning the residual toner on the peripheral surface of the photosensitive drum and uniformly charging it after the charge is removed, and the intermediate transfer which can be contacted and separated from the photosensitive drum. A second initial operation of cleaning the residual toner is performed on the body, and a latent image of the formed image is formed on the peripheral surface of the photoconductor drum subjected to the first initial operation.
The latent image is developed into a toner image, the toner image on the photoconductor drum is intermediately transferred to the intermediate transfer body that has been subjected to the second initial operation, and the toner image transferred to the intermediate transfer body is transferred to the intermediate transfer body. The image is formed by being transferred and fixed on a paper transfer body which can be contacted and separated.
【００１８】この場合、接離確認手段によって、感光体
ドラムと中間転写体間の接離状態を検知する第１の接離
検知手段、及び中間転写体と紙転写体間の接離状態を検
知する第２の接離検知手段の接離状態が確認され、接離
確認手段の確認状態に基づいて画像形成動作が制御され
る。In this case, the contact / separation confirmation means detects the contact / separation state between the photosensitive drum and the intermediate transfer body, and the contact / separation state between the intermediate transfer body and the paper transfer body. The contact / separation state of the second contact / separation detection unit is confirmed, and the image forming operation is controlled based on the confirmation state of the contact / separation confirmation unit.
【００１９】請求項２記載の発明では、請求項１記載の
発明での作用において、電源投入時に接離確認手段によ
って、第１の接離検知手段及び第２の接離検知手段が、
接触状態を検出していると確認されると、制御手段によ
って、感光体ドラムと中間転写体間及び中間転写体と紙
転写体間が離間状態にされる。According to a second aspect of the present invention, in the operation according to the first aspect of the invention, the first contact / separation detecting means and the second contact / separation detecting means are operated by the contact / separation confirmation means when the power is turned on.
When it is confirmed that the contact state is detected, the control means brings the photosensitive drum and the intermediate transfer body into a separated state and the intermediate transfer body and the paper transfer body into a separated state.
【００２０】請求項３記載の発明では、請求項１記載の
発明での作用において、接離確認手段によつて、第１の
接離検知手段が、離間状態を検知していることが確認さ
れた後に、制御手段によって第１の初期動作が実行され
る。According to the invention of claim 3, in the operation of the invention of claim 1, it is confirmed by the contact / separation confirmation means that the first contact / separation detection means detects the separated state. After that, the first initial operation is executed by the control means.
【００２１】請求項４記載の発明では、請求項１記載の
発明での作用において、制御手段が、接離確認手段によ
って、第１の接離検知手段及び第２の接離検知手段が、
離間状態を検知していることが確認された後に、制御手
段によって第２の初期動作が実行される。According to a fourth aspect of the present invention, in the operation according to the first aspect of the invention, the control means causes the contact / separation confirmation means to cause the first contact / separation detection means and the second contact / separation detection means to operate.
After confirming that the separated state is detected, the control unit executes the second initial operation.
【００２２】請求項５記載の発明では、請求項１記載の
発明での作用において、接離確認手段によって、第１の
接離検知手段及び第２の接離検知手段が、離間状態を検
知していることが確認された後に、制御手段によって画
像形成動作が実行される。According to a fifth aspect of the present invention, in the operation according to the first aspect of the invention, the contact / separation confirmation means causes the first contact / separation detection means and the second contact / separation detection means to detect the separated state. After it is confirmed that the image forming operation is performed, the image forming operation is executed by the control unit.
【００２３】請求項６記載の発明では、請求項１記載の
発明での作用において、画像形成動作終了毎に、制御手
段によって、感光体ドラムと中間転写体間及び中間転写
体と紙転写体間が離間状態にされる。According to the sixth aspect of the present invention, in the operation according to the first aspect of the invention, the control means causes a gap between the photoconductor drum and the intermediate transfer body and a gap between the intermediate transfer body and the paper transfer body to be formed each time the image forming operation is completed. Are separated.
【００２４】請求項７記載の発明では、請求項１記載の
発明での作用において、制御手段が、ジャム処理を含む
異常処理終了後に、制御手段によつて、感光体ドラムと
中間転写体間及び中間転写体と紙転写体間が離間状態に
される。According to a seventh aspect of the invention, in the operation according to the first aspect of the invention, the control means controls the gap between the photosensitive drum and the intermediate transfer body by the control means after the abnormal processing including the jam processing is completed. The intermediate transfer body and the paper transfer body are separated from each other.
【００２５】[0025]
［第１の実施例］本発明の第１の実施例を図１ないし図
１１を参照して説明する。図１は本実施例の全体構成を
示す説明図、図２は図１の現像器部分の拡大説明図で、
図３は図１の中間転写ベルト回りの拡大説明図である。[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing the overall configuration of the present embodiment, and FIG. 2 is an enlarged explanatory diagram of the developing device portion of FIG.
FIG. 3 is an enlarged explanatory diagram around the intermediate transfer belt in FIG.
【００２６】本実施例は、図１に示すように、筺体Ｃ内
において、中央位置にカラー画像の形成を行うカラー画
像記録装置２が設けられ、このカラー画像記録装置２の
上方に、原稿３の画像の読取りを行うカラー画像読取り
装置１が、カラー画像記録装置２の下方に、カラー画像
記録装置２に転写紙を供給する給紙装置Ｐが設けられた
構成となっている。In this embodiment, as shown in FIG. 1, a color image recording device 2 for forming a color image is provided at a central position in a housing C, and an original 3 is provided above the color image recording device 2. The color image reading device 1 for reading the image is provided below the color image recording device 2 with a paper feeding device P for supplying the transfer paper to the color image recording device 2.
【００２７】カラー画像読取り装置１には、原稿３に光
を照射する照明ランプ４、原稿３からの反射光を反射伝
送するミラー群５、ミラー群５からの光を集光するレン
ズ６、及びＢＧＲ毎に色分解可能なＣＣＤ（光電変換素
子）からなり、レンズ６で結像された光から、原稿３の
カラー画像情報を、青（Ｂ）、緑（Ｇ）、赤（Ｒ）の色
分解光毎に読取り、電気的な画像信号に変換するカラー
センサ７が設けられている。In the color image reading apparatus 1, an illumination lamp 4 for irradiating the original 3 with light, a mirror group 5 for reflecting and transmitting the reflected light from the original 3, a lens 6 for condensing the light from the mirror group 5, and Each BGR is composed of a CCD (photoelectric conversion element) capable of color separation, and the color image information of the original 3 is obtained from the light imaged by the lens 6 in the colors of blue (B), green (G), and red (R). A color sensor 7 is provided which reads each decomposed light and converts it into an electric image signal.
【００２８】このカラー画像読取り装置１の下方には、
レーザダイオード８ａ、ポリゴンミラー８ｂ、ポリゴン
ミラー８ｂの回転用モータ８ｃ、ｆ−θレンズ８ｄ、反
射ミラー８ｅからなり、カラー画像読取り装置１からの
カラー画像データを光信号に変換して、原稿画像に対応
する光書込みを行う書込光学ユニット８が設けられてい
る。Below the color image reading device 1,
It comprises a laser diode 8a, a polygon mirror 8b, a rotation motor 8c for the polygon mirror 8b, an f-θ lens 8d, and a reflection mirror 8e. The color image data from the color image reading device 1 is converted into an optical signal to form an original image. A writing optical unit 8 for performing corresponding optical writing is provided.
【００２９】書込光学ユニット８の下方に、回転軸を中
心に回転自在な感光体ドラム９が設けられ、感光体ドラ
ム９の周面に近接対向して、クリーニング前除電器１０
ａを含む感光体クリーニングユニット１０、除電ランプ
１１、帯電器１２、電位センサ１３、Ｋ現像器１４、Ｃ
現像器１５、Ｍ現像器１６、Ｙ現像器１７、パタン濃度
検知器１８、及び中間転写ベルト１９が、反時計回り方
向にこの順で配設されている。また、Ｙ現像器１７の下
方には、トナー像が転写された転写紙を搬送する搬送ベ
ルト１７が配設され、搬送ベルト１７の搬送方向の端部
には、定着処理を行う定着部２８が配設されている。Below the writing optical unit 8, a photosensitive drum 9 which is rotatable around a rotation axis is provided, and the pre-cleaning static eliminator 10 is provided in close proximity to the peripheral surface of the photosensitive drum 9.
a photoconductor cleaning unit 10 including a, a charge eliminating lamp 11, a charger 12, a potential sensor 13, a K developing device 14, C
The developing device 15, the M developing device 16, the Y developing device 17, the pattern density detector 18, and the intermediate transfer belt 19 are arranged in this order in the counterclockwise direction. Further, below the Y developing device 17, a conveyor belt 17 that conveys the transfer sheet on which the toner image has been transferred is disposed, and a fixing unit 28 that performs a fixing process is provided at an end portion of the conveyor belt 17 in the conveyance direction. It is arranged.
【００３０】各色の現像器は、図２に示すように、感光
体ドラム９上の静電潜像を現像するために、現像ブラシ
（現像剤の穂）を形成して回転する現像ローラ１４ａ〜
１７ａ、現像剤を汲み上げ撹拌するように回転する現像
パドル１４ｂ〜１７ｂ、及び現像剤のトナー濃度を検知
するトナー濃度検知センサ１４ｃ〜１７ｃを備え、現像
ローラ駆動モータの回転方向によって、図２の矢印方向
への回転では、各色現像器の現像ローラ上には、現像剤
の穂が立って現像可能な状態となり、矢印逆方向の回転
によって、現像剤の穂切りで現像不可能な状態となるよ
うに構成されている。As shown in FIG. 2, each color developing device forms a developing brush (brush of developer) and rotates the developing roller 14a to develop an electrostatic latent image on the photosensitive drum 9.
2 includes a developing paddle 17a, developing paddles 14b to 17b that rotate so as to scoop up and stir the developer, and toner concentration detection sensors 14c to 17c that detect the toner concentration of the developer, depending on the rotation direction of the developing roller drive motor. When rotated in the direction, the developer spikes stand on the developing roller of each color developing device so that development is possible, and rotation in the opposite direction of the arrow causes the developer to be cut off so that development cannot be performed. Is configured.
【００３１】給紙装置Ｐには、第１の給紙部３１、第２
の給紙部３２、第３の給紙部３３及び手差給紙部３４が
設けられ、選択された給紙部からそれぞれの給紙ローラ
３１ａ〜３４ａとレジストローラ２６を介して、転写紙
が給紙されるように構成されている。The paper feeding device P includes a first paper feeding section 31 and a second paper feeding section 31.
A sheet feeding unit 32, a third sheet feeding unit 33, and a manual sheet feeding unit 34 are provided, and the transfer sheet is transferred from the selected sheet feeding unit via the sheet feeding rollers 31a to 34a and the registration roller 26. It is configured to be fed.
【００３２】本実施例では、図３に示すように、感光体
ドラム９に対して、バイアスローラ２０ａ、２０ｂ及び
転写ベルト駆動ローラ２１に巻装された中間転写ベルト
１９が、接離自在に配設され、中間転写ベルト１９に近
接対向して、中間転写後に中間転写ベルト１９をクリー
ニングする中間転写ベルトクリーニングユニット２２
と、中間転写ベルト１９にフィルミング防止のために、
コーティング剤を塗布するスイパブラシ２３とが配設さ
れている。また、転写ベルト駆動ローラ２１に近接対向
して、紙転写バイアスローラ２４ａを備え、中間転写ベ
ルト１９に対して接離自在な紙転写部２４が配設されて
いる。In the present embodiment, as shown in FIG. 3, the intermediate transfer belt 19 wound around the bias rollers 20a and 20b and the transfer belt drive roller 21 is arranged so as to come in contact with and separate from the photosensitive drum 9. An intermediate transfer belt cleaning unit 22 that is provided and closely faces the intermediate transfer belt 19 to clean the intermediate transfer belt 19 after the intermediate transfer.
To prevent filming on the intermediate transfer belt 19,
A wiper brush 23 for applying a coating agent is provided. Also, a paper transfer bias roller 24 a is provided in close proximity to the transfer belt drive roller 21, and a paper transfer unit 24 is provided which can be brought into contact with and separated from the intermediate transfer belt 19.
【００３３】図４は図１の感光体ドラムと中間転写ベル
トの接離機構の説明図、図５は図１の中間転写ベルトと
紙転写部の接離機構の説明図である。FIG. 4 is an explanatory view of the contact / separation mechanism between the photosensitive drum and the intermediate transfer belt in FIG. 1, and FIG. 5 is an explanatory view of the contact / separation mechanism between the intermediate transfer belt and the paper transfer portion in FIG.
【００３４】感光体ドラム９に対して、中間転写ベルト
１９を接離駆動する接離機構は、図４に示すような構成
を有し、図示せぬ駆動源からの駆動力は、転写ベルト接
離クラッチ２５ａを介して、カム軸２５ｂに伝達される
ようになっており、カム軸２５ｂには偏心カム２５ｃが
取り付けられ、偏心カム２５ｃが移動すると、テンシヨ
ンブラケツト２５ｄが押し込まれ、中間転写ベルト１９
が感光体ドラム９に対接するように構成されている。The contact / separation mechanism for contacting / separating the intermediate transfer belt 19 to / from the photoconductor drum 9 has a structure as shown in FIG. 4, and the driving force from a drive source (not shown) is used for contacting the transfer belt. It is adapted to be transmitted to a cam shaft 25b via a separating clutch 25a. An eccentric cam 25c is attached to the cam shaft 25b. When the eccentric cam 25c moves, the tension bracket 25d is pushed in, and the intermediate transfer belt 19
Are configured to be in contact with the photosensitive drum 9.
【００３５】また、カム軸２５ｂと連動して回転するベ
ルト接離アクチュエータ２５ｅと、ベルト接離アクチュ
エータ２５ｅの近傍に配置された転写ベルト接離検知セ
ンサ２５ｆとによつて、感光体ドラム９と中間転写ベル
ト１９との接離状態が検知されるように構成されてい
る。Further, a belt contact / separation actuator 25e which rotates in conjunction with the cam shaft 25b and a transfer belt contact / separation detection sensor 25f which is arranged in the vicinity of the belt contact / separation actuator 25e provide an intermediate position with respect to the photosensitive drum 9. The contact state with the transfer belt 19 is configured to be detected.
【００３６】同様に図示せぬ駆動源からの駆動力が、中
間転写ベルトクリーニングユニット２２のカム軸２２ｃ
に伝達されると、図示せぬ偏心カムによつて、中間転写
ベルトクリーニングユニット２２が、中間転写ベルト１
９に対接するような構成になっている。Similarly, a driving force from a driving source (not shown) is applied to the cam shaft 22c of the intermediate transfer belt cleaning unit 22.
Is transmitted to the intermediate transfer belt cleaning unit 22 by an eccentric cam (not shown).
It is constructed so as to face 9.
【００３７】同様に、図５に示すように、図示せぬ駆動
源からの駆動力が、紙転写部接離クラッチ２４ａを介し
て、カム軸２４ｂに伝達されるようになっており、カム
軸２４ｂには偏心カムが取り付けられ、偏心カムが移動
すると、紙転写部２４が中間転写ベルト１９に対接する
ように構成されている。また、カム軸２４ｂと連動して
回転する接離アクチュエータ２４ｃと、接離アクチュエ
ータ２４ｃの近傍に配置された紙転写部接離検知センサ
２４ｄとによつて、紙転写部２４と中間転写ベルト１９
との接離状態が検知されるように構成されている。Similarly, as shown in FIG. 5, the driving force from a driving source (not shown) is transmitted to the cam shaft 24b through the paper transfer unit contact / separation clutch 24a. An eccentric cam is attached to 24b, and when the eccentric cam moves, the paper transfer section 24 contacts the intermediate transfer belt 19. Further, by the contact / separation actuator 24c that rotates in conjunction with the cam shaft 24b and the paper transfer portion contact / separation detection sensor 24d arranged in the vicinity of the contact / separation actuator 24c, the paper transfer portion 24 and the intermediate transfer belt 19 are provided.
The contact / separation state with and is detected.
【００３９】図６は図１に組み込まれる電気回路部のブ
ロック図である。本実施例の電気回路部には、図６に示
すように、動作の制御を行う制御部５０が設けられ、こ
の制御部には、全体の動作を制御するＣＰＵ５０ａが配
設され、ＣＰＵ５０ａには、画像形成動作の制御プログ
ラムが格納されたＲＯＭ５０ｂ、不揮発性の電源５０ｄ
を有し、画像形成動作時に各種のデータが読み出され、
また書込まれるＲＡＭ５０ｃ、シリアル通信を行うシリ
アル送信回路５０ｅ、各センサに接続されるＤＡ変換器
５０ｆ、波型出力用回路５０ｇ及びパラレル入出力用回
路５０ｈが接続され、パラレル入出力用回路５０ｈに
は、各種のモータを駆動するモータドライバ５０ｉが接
続されている。FIG. 6 is a block diagram of the electric circuit unit incorporated in FIG. As shown in FIG. 6, the electric circuit section of the present embodiment is provided with a control section 50 for controlling the operation, and this control section is provided with a CPU 50a for controlling the overall operation, and the CPU 50a is provided with the CPU 50a. ROM 50b storing a control program for image forming operation, non-volatile power source 50d
And various data is read during image forming operation,
A RAM 50c to be written, a serial transmission circuit 50e for performing serial communication, a DA converter 50f connected to each sensor, a waveform output circuit 50g, and a parallel input / output circuit 50h are connected to the parallel input / output circuit 50h. Is connected to a motor driver 50i that drives various motors.
【００４０】そして、ＲＯＭ５０ｂ、ＲＡＭ５０ｃ、シ
リアル送信回路５０ｅ、ＤＡ変換器５０ｆ、波型出力用
回路５０ｇ、及びパラレル入出力用回路５０ｈが互いに
接続されている。The ROM 50b, the RAM 50c, the serial transmission circuit 50e, the DA converter 50f, the waveform output circuit 50g, and the parallel input / output circuit 50h are connected to each other.
【００４１】制御部５０には、現像ローラ１４ａ〜１７
ａを正逆転駆動するモータ７０ａ〜７３ａを、制御部５
０からのＯＮ信号、ＣＷ信号の処理によって、定速駆動
する現像ローラ駆動モータ制御部７０ｂ〜７３ｂが接続
されている。The controller 50 includes the developing rollers 14a-17.
The motors 70a to 73a for driving a in forward and reverse directions are controlled by the control unit 5
By processing the ON signal and CW signal from 0, the developing roller drive motor control units 70b to 73b that are driven at a constant speed are connected.
【００４２】また、制御部５０には、制御部５０からの
ＯＮ信号、ＣＷ信号の処理によって、現像パドル１４ｂ
〜１７ｂを駆動するモータ７４ａを定速駆動する現像駆
動モータ制御部７４ｂ、制御部５０からのＯＮ信号、Ｃ
Ｗ信号の処理によって、感光体ドラム９を駆動するモー
タ７５ａを、定速駆動する感光体ドラム駆動モータ制御
部７５ｂ、及び制御部５０からシリアル信号を受信し
て、中間転写ベルト１９を駆動するモータ７６ａを、正
逆転駆動する中間転写ベルト駆動モータ制御部７６ｂが
接続されている。Further, the control section 50 processes the ON signal and the CW signal from the control section 50 so that the developing paddle 14b can be processed.
˜17b, a developing drive motor controller 74b for driving the motor 74a at a constant speed, an ON signal from the controller 50, C
A motor for driving the intermediate transfer belt 19 by receiving a serial signal from the motor 75a for driving the photosensitive drum 9 by the processing of the W signal, a photosensitive drum drive motor controller 75b for constant speed driving, and the controller 50. An intermediate transfer belt drive motor controller 76b for driving the 76a in the forward and reverse directions is connected.
【００４３】一方、制御部５０には、感光体ドラム９の
電位を検知する電位センサ１３、感光体ドラム９の地肌
濃度を検知する現像濃度パターン検知器１８、現像器１
４〜１７内のトナー濃度をそれぞれ検知するトナー濃度
検知センサ１４ｃ〜１７ｃが接続されている。On the other hand, the control unit 50 includes a potential sensor 13 for detecting the potential of the photosensitive drum 9, a developing density pattern detector 18 for detecting the background density of the photosensitive drum 9, and a developing device 1.
Toner concentration detection sensors 14c to 17c for detecting the toner concentrations in 4 to 17 are connected.
【００４４】また、制御部５０には、クリーニング前除
電１０ａ、除電ランプ１１、帯電器１２の電源となる帯
電用電源６０、各現像器１４〜１７の現像ローラ１４ａ
〜１７ａと感光体クリーニングユニット１０のバイアス
電源となる現像用電源６１、及びバイアスローラ２０
ａ、２０ｂ及び紙転写バイアスローラ２４ａのバイアス
電源となる転写用電源６２が接続されている。これらの
電源の電圧は、制御部５０からのＯＮ信号及びＰＷＭ信
号によって、出力値が調整されるように構成されてい
る。Further, the control unit 50 includes a pre-cleaning charge eliminator 10a, a charge eliminator 11, a charging power source 60 for powering the charger 12, and a developing roller 14a for each of the developing units 14-17.
.About.17a, a developing power source 61 serving as a bias power source for the photoconductor cleaning unit 10, and a bias roller 20.
A transfer power source 62 serving as a bias power source for the paper transfer bias rollers 24a and 20a is connected. The output values of the voltages of these power supplies are adjusted by the ON signal and the PWM signal from the control unit 50.
【００４５】また、ＤＡ変換器５０ｆは、ＣＰＵ５０ａ
の指令によつて、トナー濃度検知センサ１４ｃ〜１７ｃ
が、現像器１４〜１７内の初期現像剤のトナー濃度をそ
れぞれ標準検知するように、ＤＡ変換出力の調整をする
ように構成されている。さらに、パラレル入出力用回路
５０ｈには、各種のクラッチ、ソレノイドをＯＮ−ＯＦ
Ｆ制御するドライバ素子が接続されている。The DA converter 50f is composed of the CPU 50a.
Of the toner concentration detection sensors 14c to 17c
However, the DA conversion output is adjusted so that the toner density of the initial developer in each of the developing devices 14 to 17 is standardly detected. Further, the parallel input / output circuit 50h has various clutches and solenoids turned on and off.
A driver element for F control is connected.
【００４６】そして、本実施例では、ＣＰＵ５０ａは、
電源投入時に転写ベルト接離検知センサ２５ｆ及び紙転
写接離検知センサ２４ｄが、接触状態を検出していると
確認されると、感光体ドラム９と中間転写ベルト１９間
及び中間転写ベルト１９と紙転写体部２４間を離間状態
にする機能を有している。In this embodiment, the CPU 50a
When it is confirmed that the contact state of the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24d is detected when the power is turned on, between the photosensitive drum 9 and the intermediate transfer belt 19 and between the intermediate transfer belt 19 and the paper. It has a function of separating the transfer body portions 24 from each other.
【００４７】同様に、ＣＰＵ５０ａは、接離検知センサ
２５ｆが、離間状態を検知していることが確認された後
に、感光体ドラム９に対して、周面の残存トナーをクリ
ーニングし、除電後に均一に帯電する第１の初期動作を
実行する機能を有している。Similarly, after confirming that the contact / separation detection sensor 25f detects the separated state, the CPU 50a cleans the residual toner on the peripheral surface of the photosensitive drum 9 and uniformly removes the charge. It has a function of executing the first initial operation of being charged to.
【００４８】同様に、ＣＰＵ５０ａは、転写ベルト接離
検知センサ２５ｆ及び紙転写接離検知センサ２４ｄが、
接触状態を検出していることが確認された後に、中間転
写ベルト１９に対して、残存トナーをクリーニングする
第２の初期動作を実行する機能を有している。Similarly, in the CPU 50a, the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24d are
After it is confirmed that the contact state is detected, the intermediate transfer belt 19 has a function of executing a second initial operation of cleaning the residual toner.
【００４９】このような構成の本実施例の動作を説明す
る。図７は本実施例の第１の初期動作を示すフローチャ
ート、図８は本実施例の第２の初期動作を示すフローチ
ャート、図９は本実施例の接離チェック動作を示すフロ
ーチャート、図１０は本実施例の感光体ドラムと中間転
写ベルトの離間動作を示すフローチャート、図１１は本
実施例の中間転写ベルトと紙転写部の離間動作を示すフ
ローチャートである。The operation of this embodiment having such a configuration will be described. 7 is a flow chart showing the first initial operation of this embodiment, FIG. 8 is a flow chart showing the second initial operation of this embodiment, FIG. 9 is a flow chart showing the contact / separation check operation of this embodiment, and FIG. FIG. 11 is a flowchart showing the separating operation between the photoconductor drum and the intermediate transfer belt of this embodiment, and FIG. 11 is a flowchart showing the separating operation of the intermediate transfer belt and the paper transfer portion of this embodiment.
【００５０】電源投入直後に、図９のフローチャートの
ステップＳ１において、感光体ドラム９と中間転写ベル
ト１９間及び中間転写ベルト１９と紙転写部２４間の接
離処理動作がチェックされ、処理中であれば処理を一旦
終了し、未処理と判定されると、ステップＳ２に進んで
接離駆動源を駆動し、ステップＳ３で駆動状態から所定
時間が経過したか否かが判定され、所定時間が経過した
と判定されると、ステップＳ４に進んで、中間転写ベル
ト１９が感光体ドラム９との接離状態が判定される。Immediately after the power is turned on, in step S1 of the flowchart of FIG. 9, the contact / separation processing operation between the photoconductor drum 9 and the intermediate transfer belt 19 and between the intermediate transfer belt 19 and the paper transfer portion 24 is checked and is being processed. If there is, the process is temporarily ended, and if it is determined that the process is not performed, the process proceeds to step S2 to drive the contact / separation drive source, and in step S3, it is determined whether or not a predetermined time has elapsed from the driving state. If it is determined that the time has elapsed, the process proceeds to step S4, and it is determined whether the intermediate transfer belt 19 is in contact with or separated from the photosensitive drum 9.
【００５１】ステップＳ４で、中間転写ベルト１９が感
光体ドラム９と接触していると判定されると、ステップ
Ｓ５に進んで、接離処理動作中とセットされ、中間転写
ベルト１９の離間処理が起動される。If it is determined in step S4 that the intermediate transfer belt 19 is in contact with the photosensitive drum 9, the process proceeds to step S5, where the contact / separation processing operation is set, and the separation processing of the intermediate transfer belt 19 is performed. Is activated.
【００５２】この中間転写ベルト１９の離間処理は、図
１０のフローチャートに従って行われ、ステップＳ２１
で、中間転写ベルト１９の転写ベルト接離クラッチ２５
ａがＯＮ駆動され、ステップＳ２２で、このＯＮ駆動が
所定時間Ｔ１１継続したと判定されると、ステップＳ２
３に進んで、転写ベルト接離クラッチ２５ａの駆動がＯ
ＦＦとされ、ステップＳ２４で転写ベルト接離クラッチ
２５ａのＯＦＦの状態が所定時間Ｔ１２継続したと判定
されると、ステップＳ２５に進んで、中間転写ベルト１
９の接離駆動源の駆動がＯＦＦとされ、中間転写ベルト
１９の接離処理は終了する。The separation processing of the intermediate transfer belt 19 is performed according to the flowchart of FIG. 10, and step S21
Then, the transfer belt contact / separation clutch 25 of the intermediate transfer belt 19
When a is ON-driven and it is determined in step S22 that this ON-drive has continued for a predetermined time T11, step S2
3, the drive of the transfer belt contact / separation clutch 25a is turned off.
If it is determined to be FF and it is determined in step S24 that the transfer belt contact / separation clutch 25a has been kept OFF for the predetermined time T12, the process proceeds to step S25 and the intermediate transfer belt 1
The drive of the contact / separation drive source 9 is turned off, and the contact / separation processing of the intermediate transfer belt 19 is completed.
【００５３】次いで、ステップＳ６において、中間転写
ベルト１９と紙転写部２４間の接離状態がチェックさ
れ、中間転写ベルト１９と紙転写部２４間が離間してい
ると判定されると、ステップＳ１０に進んで、紙転写部
２４の接離駆動源の駆動がＯＦＦとされ、紙転写部２４
の接離処理は終了する。Next, in step S6, the contact / separation state between the intermediate transfer belt 19 and the paper transfer portion 24 is checked, and when it is determined that the intermediate transfer belt 19 and the paper transfer portion 24 are separated from each other, step S10 Then, the drive of the contact / separation drive source of the paper transfer unit 24 is turned off, and the paper transfer unit 24
The contact / separation process of is completed.
【００５４】ステップＳ６で、中間転写ベルト１９と紙
転写部２４間が接触していると判定されると、ステップ
Ｓ７に進んで、接離処理動作中とセットされ、紙転写部
２４の離間処理が起動される。If it is determined in step S6 that the intermediate transfer belt 19 and the paper transfer portion 24 are in contact with each other, the process proceeds to step S7, where the contact / separation processing operation is set, and the separation processing of the paper transfer portion 24 is performed. Is started.
【００５５】この紙転写部２４の離間処理は、図１１の
フローチャートに従って行われ、ステップＳ３１で、紙
転写部２４の紙転写接離クラッチ２４ａがＯＮ駆動さ
れ、ステップＳ３２で、このＯＮ駆動が所定時間Ｔ１３
継続したと判定されると、ステップＳ３３に進んで、紙
転写接離クラッチ２４ａの駆動がＯＦＦとされ、ステッ
プＳ３４で紙転写接離クラッチ２４ａのＯＦＦの状態が
所定時間Ｔ１４継続したと判定されると、ステップＳ３
５に進んで、紙転写部２４の接離駆動源の駆動がＯＦＦ
とされ、紙転写部２４の接離処理は終了する。The separation processing of the paper transfer portion 24 is performed according to the flowchart of FIG. 11. In step S31, the paper transfer contact / separation clutch 24a of the paper transfer portion 24 is ON-driven, and in step S32, this ON-drive is predetermined. Time T13
When it is determined that the paper transfer contact / separation clutch 24a is turned off, the drive of the paper transfer contact / separation clutch 24a is turned off, and it is determined in step S34 that the paper transfer contact / separation clutch 24a remains off for a predetermined time T14. And step S3
5, the drive of the contact / separation drive source of the paper transfer unit 24 is turned off.
Then, the contact / separation process of the paper transfer unit 24 is completed.
【００５６】そして、ステップＳ１で接離処理動作が終
了したと判定された場合、ステップＳ９の処理が終了し
た場合、ステップＳ１０の処理が終了した場合、ステッ
プＳ７から紙転写部２４の離間処理が終了した場合に
は、ステップＳ１１に進んで、感光体ドラム９及び中間
転写ベルト１９の初期動作実行のための起動状態がセッ
トされる。If it is determined in step S1 that the contact / separation processing operation has ended, the processing in step S9 ends, the processing in step S10 ends, the separation processing of the paper transfer unit 24 from step S7 is performed. When the process is completed, the process proceeds to step S11, and the activation state for executing the initial operation of the photoconductor drum 9 and the intermediate transfer belt 19 is set.
【００５７】感光体ドラム９に対する第１の初期動作
は、図７のフローチャートに従って行われ、ステップＳ
４１で、感光体クリーニングユニット１０内のブレード
先端に溜まったトナーを除去するために、回転体ドラム
９は、図１の矢印と逆方向に逆転を開始し、ステップＳ
４２で、逆転開始から所定時間Ｔ１が経過したと判定さ
れると、ステップＳ４３に進んで感光体ドラム９は停止
する。次いで、ステップＳ４４に進んで、感光体ドラム
９は図１の矢印方向に正転を開始し、除電ランプ１１、
帯電器１２がＯＮとされ、感光体クリーニングユニット
２２によるクリーニング動作が開始される。The first initial operation for the photosensitive drum 9 is performed according to the flowchart of FIG.
At 41, in order to remove the toner accumulated at the tip of the blade in the photoconductor cleaning unit 10, the rotary drum 9 starts reverse rotation in the direction opposite to the arrow in FIG.
If it is determined in 42 that the predetermined time T1 has elapsed from the start of reverse rotation, the process proceeds to step S43, and the photosensitive drum 9 is stopped. Next, in step S44, the photosensitive drum 9 starts forward rotation in the direction of the arrow in FIG.
The charger 12 is turned on, and the cleaning operation by the photoconductor cleaning unit 22 is started.
【００５８】そして、ステップＳ４５で、感光体ドラム
９の逆転開始から所定時間Ｔ２が経過したと判定される
と、ステップＳ４６に進んで、帯電器１２がＯＦＦとさ
れ、ステップＳ４７で、感光体ドラム９の逆転開始から
所定時間Ｔ３が経過したと判定されると、ステップＳ４
８でクリーニング前除電気器１０ａがＯＦＦとされ、ス
テップＳ４９で感光体ドラム９の逆転開始から所定時間
Ｔ４が経過したと判定されると、ステップＳ５０で感光
体ドラム９が停止され、除電ランプ１１がＯＦＦとさ
れ、クリーニングモータが停止されてクリーニング動作
が終了する。この状態で、感光体ドラム９の表面は清掃
され、電位は０となり画像形成処理が可能になる。If it is determined in step S45 that the predetermined time T2 has elapsed from the start of reverse rotation of the photosensitive drum 9, the process proceeds to step S46, the charger 12 is turned off, and in step S47, the photosensitive drum 9 is turned off. When it is determined that the predetermined time T3 has elapsed from the start of the reverse rotation of 9, the step S4
If the pre-cleaning static eliminator 10a is turned off in step 8 and it is determined in step S49 that the predetermined time T4 has elapsed from the start of the reverse rotation of the photoconductor drum 9, the photoconductor drum 9 is stopped in step S50 and the static elimination lamp 11 Is turned off, the cleaning motor is stopped, and the cleaning operation is completed. In this state, the surface of the photosensitive drum 9 is cleaned, the potential becomes 0, and the image forming process becomes possible.
【００５９】中間転写ベルト１９に対する第２の初期動
作は、図８のフローチャートに従って行われ、ステップ
Ｓ５１で、中間転写ベルト１９が正転を開始し、ステッ
プＳ５２で、正転開始後所定時間Ｔ５が経過したと判定
されると、ステップＳ５３で中間転写ベルト１９が停止
される。The second initial operation for the intermediate transfer belt 19 is performed according to the flowchart of FIG. 8. In step S51, the intermediate transfer belt 19 starts normal rotation, and in step S52, a predetermined time T5 after the normal rotation starts. When it is determined that the time has elapsed, the intermediate transfer belt 19 is stopped in step S53.
【００６０】次いで、ステップＳ５４において、中間転
写クリーニングモータが駆動され、中間転写ベルトクリ
ーニングユニット２２が作動を開始する。そして、ステ
ップＳ５５で正転開始から所定時間Ｔ６が経過したと判
定されると、ステップＳ５６で中間転写ベルト１９は正
転を開始し、ステップＳ５７で正転開始後所定時間Ｔ７
が経過したと判定されると、ステップｓ５８で中間転写
ベルト１９が停止し、中間転写ベルト１９に対するクリ
ニング動作が終了する。この状態で、中間転写ボルト１
９の表面は清掃され、画像形成処理が可能になる。Next, in step S54, the intermediate transfer cleaning motor is driven and the intermediate transfer belt cleaning unit 22 starts to operate. When it is determined in step S55 that the predetermined time T6 has elapsed from the start of the normal rotation, the intermediate transfer belt 19 starts the normal rotation in step S56, and the predetermined time T7 after the normal rotation starts in step S57.
If it is determined that has passed, the intermediate transfer belt 19 is stopped in step s58, and the cleaning operation for the intermediate transfer belt 19 is completed. In this state, the intermediate transfer bolt 1
The surface of 9 is cleaned, and the image forming process becomes possible.
【００６１】本実施例の画像形成動作を説明する。書込
光学ユニット８は、カラー読取り装置１からのカラー画
像データを、光信号に変換して、原稿画像に対応した光
書込を行い、感光体ドラム９上に静電潜像を形成する。The image forming operation of this embodiment will be described. The writing optical unit 8 converts the color image data from the color reading device 1 into an optical signal, performs optical writing corresponding to the original image, and forms an electrostatic latent image on the photosensitive drum 9.
【００６２】画像読取り装置１で読み取られたＢ、Ｇ、
Ｒの色毎の画像信号は、図示せぬ画像処理部で色変換処
理され、カラー画像記録装置で顕像化処理を行うため
に、カラー画像データ、黒（Ｋ）、シアン（Ｃ）、マゼ
ンタ（Ｍ）、イエロー（Ｙ）に変換される。B, G read by the image reading device 1
The image signal for each R color is subjected to color conversion processing by an image processing unit (not shown), and color image data, black (K), cyan (C), and magenta are used for visualization processing by the color image recording apparatus. (M) and yellow (Y).
【００６３】ここで、Ｋ、Ｃ、Ｍ、Ｙのカラー画像デー
タは、１色毎にカラー読取り装置１のスキャナスタート
信号に同期して、カラー画像記録装置２に出力される。
この処理を４回繰り返すことによって、４色分順次カラ
ー画像データが、カラー画像記録装置２において順次顕
像化され、重ね合わせ画像としてフルカラー画像に形成
される。Here, the K, C, M, and Y color image data are output to the color image recording device 2 in synchronization with the scanner start signal of the color reading device 1 for each color.
By repeating this process four times, the color image data for four colors are sequentially visualized in the color image recording device 2, and a full-color image is formed as a superimposed image.
【００６４】中間転写ベルト１９は、バイアスローラ２
０ａ、２０ｂによって、感光体ドラム９と接触し、感光
体ドラム９上に形成されたトナー像が、中間転写ベルト
１９に中間転写される。そして、正逆転駆動可能な転写
ベルト駆動ローラ２１と、紙転写バイアスローラ２４ａ
とによって、中間転写ベルト１９上のトナー像は、紙転
写バイアスローラ２４ａと転写ベルト駆動ローラ２１に
挟持される転写紙に転写される。The intermediate transfer belt 19 is composed of the bias roller 2
The toner image formed on the photoconductor drum 9 by being in contact with the photoconductor drum 9 by 0a and 20b is intermediately transferred to the intermediate transfer belt 19. Then, the transfer belt drive roller 21 that can be driven in the forward and reverse directions and the paper transfer bias roller 24a.
By this, the toner image on the intermediate transfer belt 19 is transferred onto the transfer paper sandwiched between the paper transfer bias roller 24a and the transfer belt drive roller 21.
【００６５】転写後の中間転写ベルト１９は、中間転写
ベルトクリーニングユニット２２によってクリーニング
され、転写動作によつて発生する中間転写ベルト１９上
のフィルミングを防止するために、スイーパブラシ２３
によって、コーティング剤が塗布される。The intermediate transfer belt 19 after the transfer is cleaned by the intermediate transfer belt cleaning unit 22, and in order to prevent filming on the intermediate transfer belt 19 caused by the transfer operation, the sweeper brush 23 is used.
The coating agent is applied by.
【００６６】次に、本実施例の画像形成動作を、現像動
作の順序をＫ（黒）、Ｃ（シアン）、Ｍ（マゼンタ）、
Ｙ（イエロ）として説明する。画像形成動作が開始され
ると、カラー画像読取り装置１は、所定のタイミング
で、Ｋ画像データの読取りを行い、このＫ画像データに
基づいて、レーザ光による光書込みで、感光体ドラム９
に静電潜像が形成される（以下、Ｋ画像データ、Ｃ画像
データ、Ｍ画像データ、Ｙ画像データによる静電潜像
を、Ｋ潜像、Ｃ潜像、Ｍ潜像、Ｙ潜像という）。Next, in the image forming operation of this embodiment, the order of the developing operation is K (black), C (cyan), M (magenta),
This will be described as Y (yellow). When the image forming operation is started, the color image reading device 1 reads K image data at a predetermined timing, and based on the K image data, the photosensitive drum 9 is optically written by laser light.
An electrostatic latent image is formed on the image (hereinafter, the electrostatic latent image based on K image data, C image data, M image data, and Y image data is referred to as K latent image, C latent image, M latent image, and Y latent image). ).
【００６７】このＫ潜像の先端部から現像を可能とする
ために、Ｋ現像器１４の現像位置にＫ潜像の先端が到達
する前に、予め現像ローラ１４ａ上に現像剤の穂が立っ
て現像が行われる。Ｋ現像器１４によるＫ潜像の現像が
終了すると、現像ローラ１４ａが逆転されて現像不能状
態となる。これは、少なくとも、次のＣ画像データによ
るＣ潜像先端が到達する前に完了する。In order to enable development from the tip portion of the K latent image, the spikes of the developer stand in advance on the developing roller 14a before the tip of the K latent image reaches the developing position of the K developing device 14. Development is performed. When the development of the K latent image by the K developing device 14 is completed, the developing roller 14a is rotated in the reverse direction and the development is disabled. This is completed at least before the leading edge of the C latent image by the next C image data arrives.
【００６８】感光体ドラム９に形成されたＫトナー像
は、感光体ドラム９と等速で駆動される中間転写ベルト
１９の表面に中間転写される。この中間転写は、感光体
ドラム９と中間転写ベルト１９との接触状態において、
バイアスローラ２０に所定のバイアス電圧が印加される
ことにより行われる。The K toner image formed on the photosensitive drum 9 is intermediately transferred onto the surface of the intermediate transfer belt 19 which is driven at the same speed as the photosensitive drum 9. This intermediate transfer is performed when the photosensitive drum 9 and the intermediate transfer belt 19 are in contact with each other.
This is performed by applying a predetermined bias voltage to the bias roller 20.
【００６９】次に、順次行われるＣ画像、Ｍ画像、Ｙ画
像の形成工程は、感光体ドラム９上での潜像の現像と中
間転写ベルト１９上への中間転写とは、Ｋ画像の形成工
程と同様に行われるが、Ｙ画像データ現像工程は最終の
現像工程なので、Ｙ現像器の現像剤１７の現像剤穂切り
動作を行う必要はない。Next, in the process of forming C image, M image, and Y image that are sequentially performed, latent image development on the photosensitive drum 9 and intermediate transfer onto the intermediate transfer belt 19 form K image. Although it is performed in the same manner as the process, since the Y image data developing process is the final developing process, it is not necessary to perform the developer cutting operation of the developer 17 of the Y developing device.
【００７０】このようにして行われる中間転写ベルト１
９上の同一面に、Ｋ、Ｃ、Ｍ、Ｙのトナー像が形成され
る工程を説明する。中間転写ベルト１９の同一方向への
回転によって生じる端部への寄りにより、各色のトナー
像の位置ずれを防止するために、感光体ドラム９上のＫ
トナー像の中間転写ベルト１９上への中間転写時には、
感光体ドラム９と離間状態にある中間転写ベルト１９
は、先ず、中間転写時とは逆方向に所定距離回転して停
止する。The intermediate transfer belt 1 carried out in this way
A process of forming toner images of K, C, M, and Y on the same surface on 9 will be described. In order to prevent the toner image of each color from being displaced due to the deviation toward the end portion caused by the rotation of the intermediate transfer belt 19 in the same direction, the K on the photosensitive drum 9 is prevented.
At the time of intermediate transfer of the toner image onto the intermediate transfer belt 19,
Intermediate transfer belt 19 separated from the photoconductor drum 9
First, it rotates for a predetermined distance in the opposite direction to that at the time of intermediate transfer and stops.
【００７１】この状態で、感光体ドラム９上のトナー像
先端が、所定位置に達すると、中間転写ベルト駆動モー
タ制御部に起動信号が入力され、停止中の中間転写ベル
ト１９は、中間転写方向へ感光体ドラム９と等速度で回
転を開始し、中間転写位置で、感光体ドラム９と中間転
写ベルト１９とが、離間状態から接触状態になり、バイ
アスローラ２０に所定のバイアス電圧が印加され、接触
状態にある感光体ドラム９上のトナー像が、中間転写ベ
ルト１９に中間転写される。そして、感光体ドラム９上
のトナー像の後端まで中間転写が終了すると、バイアス
ローラ２０に印加されたバイアス電圧がＯＦＦとなり、
感光体ドラム９と中間転写ベルト１９は、接触状態から
離間状態にされる。In this state, when the front end of the toner image on the photosensitive drum 9 reaches a predetermined position, a start signal is input to the intermediate transfer belt drive motor control section, and the stopped intermediate transfer belt 19 moves in the intermediate transfer direction. The photosensitive drum 9 and the intermediate transfer belt 19 start rotating at the same speed as the photosensitive drum 9 and move from the separated state to the contact state at the intermediate transfer position, and a predetermined bias voltage is applied to the bias roller 20. The toner image on the photosensitive drum 9 in the contact state is intermediately transferred to the intermediate transfer belt 19. When the intermediate transfer is completed up to the rear end of the toner image on the photosensitive drum 9, the bias voltage applied to the bias roller 20 is turned off,
The photosensitive drum 9 and the intermediate transfer belt 19 are moved from the contact state to the separated state.
【００７２】次に、中間転写ベルト１９は、感光体ドラ
ム９と離間状態で、中間転写方向と逆方向に所定距離回
転して停止し、中間転写開始時に停止していた位置に戻
る。同様にして、Ｃトナー像が形成された感光体ドラム
９が所定位置に達すると、起動信号が中間転写ベルト駆
動モータ制御部に入力され、中間転写ベルト１９はＣト
ナー像を中間転写するために、中間転写方向に感光体ド
ラム９と等速度で回転を開始する。この時、感光体ドラ
ム９と中間転写ベルト１９とは、離間状態から接触状態
へ状態が変化し、バイアスローラ２０に印加されるバイ
アス電圧によって、Ｃトナー像は中間転写ベルト１９上
のＫトナー像と同一面上に形成される。Next, the intermediate transfer belt 19 is separated from the photosensitive drum 9 and is rotated by a predetermined distance in the direction opposite to the intermediate transfer direction to stop, and then returns to the position where it was stopped when the intermediate transfer was started. Similarly, when the photosensitive drum 9 on which the C toner image is formed reaches a predetermined position, a start signal is input to the intermediate transfer belt drive motor control unit, and the intermediate transfer belt 19 performs intermediate transfer of the C toner image. , And starts rotating at the same speed as the photosensitive drum 9 in the intermediate transfer direction. At this time, the photosensitive drum 9 and the intermediate transfer belt 19 change from the separated state to the contact state, and the C toner image is changed to the K toner image on the intermediate transfer belt 19 by the bias voltage applied to the bias roller 20. Is formed on the same surface as.
【００７３】以下同様に、Ｍ、Ｙトナー像も中間転写ベ
ルト１９の同一面位置に中間転写される。このようにし
て、中間転写ベルト１９上に、Ｋ、Ｃ、Ｍ、Ｙトナー像
が形成されると、中間転写ベルト１９と感光体ドラム９
は離間状態となり、中間転写ベルト１９上のトナー像先
端が、紙転写部２４から所定の距離に達すると、紙転写
部２４と中間転写ベルト１９とは接触状態となり、中間
転写ベルトクリーニングユニット２２も中間転写ベルト
１９に接触する。Similarly, the M and Y toner images are also intermediately transferred to the same surface position of the intermediate transfer belt 19. In this way, when the K, C, M, and Y toner images are formed on the intermediate transfer belt 19, the intermediate transfer belt 19 and the photosensitive drum 9 are formed.
When the front end of the toner image on the intermediate transfer belt 19 reaches a predetermined distance from the paper transfer section 24, the paper transfer section 24 and the intermediate transfer belt 19 come into contact with each other, and the intermediate transfer belt cleaning unit 22 also It contacts the intermediate transfer belt 19.
【００７４】中間転写ベルト１９上のトナー像の先端
が、紙転写部２４に達するのと同期して、給紙装置Ｐか
ら供給される転写紙が、転写ベルト駆動ローラ２１位置
の中間転写ベルト１９と紙転写バイアスローラ２４ａ間
に送り込まれる。そして、紙転写バイアスローラ２４ａ
にバイアス電圧が印加され、中間転写ベルト１９上のト
ナー像は転写紙に紙転写される。この場合転写紙は、第
１給紙部３１、第２給紙部３２、第３給紙部３３及び手
差給紙部３４から選択されて、その給紙ローラ３１ａ〜
３４ａ及びレジストローラ２６によつて給紙される。In synchronization with the leading edge of the toner image on the intermediate transfer belt 19 reaching the paper transfer portion 24, the transfer paper supplied from the paper feeding device P is transferred to the intermediate transfer belt 19 at the position of the transfer belt drive roller 21. And the paper transfer bias roller 24a. Then, the paper transfer bias roller 24a
A bias voltage is applied to the intermediate transfer belt 19, and the toner image on the intermediate transfer belt 19 is transferred onto a transfer paper. In this case, the transfer paper is selected from the first paper feed unit 31, the second paper feed unit 32, the third paper feed unit 33 and the manual paper feed unit 34, and the paper feed rollers 31a to 31a are selected.
The sheet is fed by 34a and the registration roller 26.
【００７５】この紙転写終了後の中間転写ベルト１９
は、中間転写ベルトクリーニングユニット２２によつ
て、表面の所定領域が清掃され、清掃済みの中間転写ベ
ルト１９には、スイーパブラシ２３によつて、フィルミ
ング防止のためにコーティング剤の塗布が行われる。紙
転写後の転写紙は、搬送ベルト２７によって、定着部２
８に送り込まれて、定着処理が行われて画像形成動作が
終了し、画像形成された転写紙が排紙トレーに排出され
る。Intermediate transfer belt 19 after the completion of the paper transfer
The intermediate transfer belt cleaning unit 22 cleans a predetermined area on the surface, and the cleaned intermediate transfer belt 19 is coated with a coating agent by the sweeper brush 23 to prevent filming. . The transfer paper after the paper transfer is fixed by the transport belt 27 to the fixing unit 2
8, the fixing process is performed, the image forming operation is completed, and the transfer sheet on which the image is formed is discharged to the discharge tray.
【００７６】以上に説明したように、本実施例による
と、電源投入時に転写ベルト接離検知センサ２５ｆ及び
紙転写接離検知センサ２４ｄが、接触状態を検出してい
ると確認されると、ＣＰＵ５０ａによって、感光体ドラ
ム９と中間転写ベルト１９間及び中間転写ベルト１９と
紙転写体２４間が離間状態にされるので、感光体ドラム
９、中間転写ベルト１９の初期動作を、それぞれ任意の
処理手順でスムーズに行うことが可能になる。As described above, according to this embodiment, when it is confirmed that the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24d detect the contact state when the power is turned on, the CPU 50a. As a result, the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer body 24 are separated from each other, so that the initial operation of the photosensitive drum 9 and the intermediate transfer belt 19 can be performed by arbitrary processing procedures. It will be possible to do smoothly.
【００７７】また、転写ベルト接離検知センサ２５ｆ
が、離間状態を検知していることが確認された後に、Ｃ
ＰＵ５０ａによって第１の初期動作が実行されるので、
感光体ドラム９に対する第１の初期動作が、感光体ドラ
ム９に機械的磨耗によるダメージやクリーニング不良を
起こすことなく実行可能になる。Further, the transfer belt contact / separation detection sensor 25f
However, after confirming that the separated state is detected, C
Since the first initial operation is executed by the PU 50a,
The first initial operation for the photoconductor drum 9 can be executed without causing damage to the photoconductor drum 9 due to mechanical abrasion or cleaning failure.
【００７８】さらに、ＣＰＵ５０ａによって、転写ベル
ト接離検知センサ２５ｆ及び紙転写接離検知センサ２４
ｄが離間状態を検知していることが確認された後に、第
２の初期動作が実行されるので、中間転写ベルト１９に
対する第２の初期動作が、中間転写ベルト１９に機械的
磨耗によるダメージやクリーニング不良を起こすことな
く実行可能になるFurther, the CPU 50a allows the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24 to be detected.
Since the second initial operation is executed after it is confirmed that d detects the separated state, the second initial operation on the intermediate transfer belt 19 causes the intermediate transfer belt 19 to be damaged due to mechanical wear or damage. Can be executed without causing poor cleaning
【００７９】［第２の実施例］本発明の第２の実施例を
図１２を参照して説明する。図１２は本実施例の接離チ
ェック動作を示すフローチャートである。[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. FIG. 12 is a flowchart showing the contact / separation check operation of this embodiment.
【００８０】本実施例の構成は、すでに図１ないし図６
を参照して説明した第１の実施例と基本的には同一であ
る。本実施例では、ＣＰＵ５０ａは、転写ベルト接離検
知センサ２５ｆ及び紙転写接離検知センサ２４ｄが、離
間状態を検知していることを確認後に、画像形成動作を
実行する機能を有している。また、ＣＰＵ５０ａは、画
像形成動作終了毎に、感光体ドラム９と中間転写ベルト
１９間及び中間転写ベルト１９と紙転写部２４間を離間
状態にする機能を有している。さらに、ＣＰＵ５０ａ
は、ジャム処理を含む異常処理終了後に、感光体ドラム
９と中間転写ベルト１９間及び中間転写ベルト１９と紙
転写部２４間を離間状態にする機能を有している。The configuration of this embodiment is already shown in FIGS.
It is basically the same as the first embodiment described with reference to FIG. In the present embodiment, the CPU 50a has a function of executing an image forming operation after confirming that the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24d detect the separated state. Further, the CPU 50a has a function of putting the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer section 24 in a separated state each time the image forming operation is completed. Furthermore, the CPU 50a
Has a function of putting the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer portion 24 into a separated state after the abnormal processing including the jam processing is completed.
【００８１】本実施例の接離チェック動作を、図１２の
フローチャートを参照して説明する。図１２のフローチ
ャートにおいて、ステップＳ１ないしステップＳ１０の
処理は、すでに説明した図９のフローチャートのステッ
プＳ１ないしステップＳ１０と同一である。The contact / separation check operation of this embodiment will be described with reference to the flowchart of FIG. In the flowchart of FIG. 12, the processes of steps S1 to S10 are the same as the steps S1 to S10 of the flowchart of FIG. 9 already described.
【００８２】本実施例では、ステップＳ９の処理が終了
した場合、ステップＳ１０の処理が終了した場合、ステ
ップＳ７から紙転写部２４の離間処理が終了した場合、
ステップＳ１で接離処理チェックが終了したと判定され
た場合には、ステップＳ１２に進んで、中間転写ベルト
１９が待機状態にセットされる。In this embodiment, when the process of step S9 is completed, the process of step S10 is completed, or the process of separating the paper transfer unit 24 from step S7 is completed,
If it is determined in step S1 that the contact / separation processing check has been completed, the process proceeds to step S12, and the intermediate transfer belt 19 is set to the standby state.
【００８３】また、本実施例では、ＣＰＵ５０ａの指令
によって、画像形成動作終了毎に、ＣＰＵ５０ａによっ
て、感光体ドラム９と中間転写ベルト１９間及び中間転
写ベルト１９と紙転写部２４間が離間状態にされる。さ
らに、本実施例では、ＣＰＵ５０ａの指令によって、ジ
ャム処理を含む異常処理終了後に、感光体ドラム９と中
間転写ベルト１９間及び中間転写ベルト１９と紙転写部
２４間が離間状態にされる。本実施例のその他の動作
は、すでに説明した第１の実施例と同一である。In the present embodiment, the CPU 50a causes the CPU 50a to separate the photoconductor drum 9 from the intermediate transfer belt 19 and the intermediate transfer belt 19 from the paper transfer unit 24 each time the image forming operation is completed. To be done. Further, in this embodiment, the CPU 50a commands the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer unit 24 to be separated from each other after the abnormal processing including the jam processing ends. The other operations of this embodiment are the same as those of the first embodiment already described.
【００８４】以上に説明したように、本実施例による
と、転写ベルト接離検知センサ２５ｆ及び紙転写接離検
知センサ２４ｄが、離間状態を検知していることが確認
された後に、ＣＰＵ５０ａによって画像形成動作が実行
されるので、画像形成動作を短時間で効率的に且つスム
ーズに行うことが可能になる。As described above, according to this embodiment, after it is confirmed that the transfer belt contact / separation detection sensor 25f and the paper transfer contact / separation detection sensor 24d detect the separated state, the image is read by the CPU 50a. Since the forming operation is performed, the image forming operation can be efficiently and smoothly performed in a short time.
【００８５】また、画像形成動作終了毎に、ＣＰＵ５０
ａによって、感光体ドラム９と中間転写ベルト１９間及
び中間転写ベルト１９と紙転写部２４間が離間状態にさ
れるので、次の画像形成動作開始時に、中間転写ベルト
１９が所望の待機位置にあり、画像形成動作を短時間で
効率的に且つスムーズに行うことが可能になる。Further, every time the image forming operation is completed, the CPU 50
Since the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer section 24 are separated by a, the intermediate transfer belt 19 is set to a desired standby position at the start of the next image forming operation. Therefore, the image forming operation can be efficiently and smoothly performed in a short time.
【００８６】さらに、ＣＰＵ５０ａによって、ジャム処
理を含む異常処理終了後に、感光体ドラム９と中間転写
ベルト１９間及び中間転写ベルト１９と紙転写部２４間
が離間状態にされるので、異常処理終了後の画像形成動
作をスムーズに継続することが可能になる。Further, after the abnormal processing including the jam processing is completed by the CPU 50a, the photosensitive drum 9 and the intermediate transfer belt 19 and the intermediate transfer belt 19 and the paper transfer section 24 are separated from each other. The image forming operation can be smoothly continued.
【００８６】[0086]
【発明の効果】請求項１記載の発明によると、感光体ド
ラムと中間転写体間の接離状態を検知する第１の接離検
知手段、及び中間転写体と紙転写体間の接離状態を検知
する第２の接離検知手段の接離状態が、接離確認手段に
よって確認され、この確認状態に基づいて、感光体ドラ
ムの周面の残存トナーをクリーニングし、除電後に均一
に帯電する第１の初期動作と、感光体ドラムに接離自在
な中間転写体の残存トナーをクリーニングする第２の初
期動作とが施され、第１の初期動作が施された感光体ド
ラムの周面に、被形成画像の潜像が形成され、該潜像が
トナー像に現像され、第２の初期動作が施された中間転
写体に、感光体ドラムのトナー像が中間転写され、中間
転写体に転写されたトナー像が、中間転写体に接離自在
な紙転写体に転写され定着されて画像形成が行われるの
で、全体の画像形成動作を、感光体ドラムと中間転写体
間及び中間転写体と紙転写体間の接離状態に、適確に対
応させてスムーズに行うことが可能になる。According to the first aspect of the present invention, the first contact / separation detecting means for detecting the contact / separation state between the photosensitive drum and the intermediate transfer body, and the contact / separation state between the intermediate transfer body and the paper transfer body. The contact / separation state of the second contact / separation detection unit for detecting the state is confirmed by the contact / separation confirmation unit, and based on this confirmation state, the residual toner on the peripheral surface of the photosensitive drum is cleaned and uniformly charged after the charge removal. The first initial operation and the second initial operation for cleaning the residual toner on the intermediate transfer member which can be freely contacted and separated from the photosensitive drum are performed, and the peripheral surface of the photosensitive drum on which the first initial operation is performed is performed. , A latent image of the formed image is formed, the latent image is developed into a toner image, and the toner image on the photosensitive drum is intermediately transferred to the intermediate transfer body that has been subjected to the second initial operation, and then the intermediate transfer body is transferred. The transferred toner image is transferred to a paper transfer body that can be moved in and out of the intermediate transfer body. Since the image is formed after fixing and fixing, the entire image forming operation is performed smoothly by accurately responding to the contact / separation state between the photosensitive drum and the intermediate transfer body and between the intermediate transfer body and the paper transfer body. It will be possible.
【００８７】請求項２記載の発明によると、請求項１記
載の発明で得られる効果に加えて、電源投入時に接離確
認手段によって、第１の接離検知手段及び第２の接離検
知手段が、接触状態を検出していると確認されると、制
御手段によって、感光体ドラムと中間転写体間及び中間
転写体と紙転写体間が離間状態にされるので、感光体ド
ラム、中間転写体及び紙転写体の初期動作を、それぞれ
任意の処理手順でスムーズに行うことが可能になる。According to the second aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, the first contact / separation detecting means and the second contact / separation detecting means are operated by the contact / separation confirmation means when the power is turned on. However, if it is confirmed that the contact state is detected, the control means causes the photosensitive drum and the intermediate transfer body to be separated from each other and the intermediate transfer body and the paper transfer body to be separated from each other. It is possible to smoothly perform the initial operation of the body and the paper transfer body in arbitrary processing procedures.
【００８８】請求項３記載の発明によると、請求項１記
載の発明で得られる効果に加えて、接離確認手段によつ
て、第１の接離検知手段が、離間状態を検知しているこ
とが確認された後に、制御手段によって第１の初期動作
が実行されるので、感光体ドセムに対する第１の初期動
作が、感光体ドラムに機械的磨耗によるダメージやクリ
ーニング不良を起こすことなく実行可能になる。According to the invention of claim 3, in addition to the effect obtained by the invention of claim 1, the first contact / separation detection means detects the separated state by the contact / separation confirmation means. After it is confirmed that the control means executes the first initial operation, the first initial operation with respect to the photosensitive drum can be executed without causing damage to the photosensitive drum due to mechanical abrasion or cleaning failure. become.
【００８９】請求項４記載の発明によると、請求項１記
載の発明で得られる効果に加えて、制御手段が、接離確
認手段によって、第１の接離検知手段及び第２の接離検
知手段が、離間状態を検知していることが確認された後
に、制御手段によって第２の初期動作が実行されるの
で、中間転写体に対する第２の初期動作が、中間転写体
に機械的磨耗によるダメージやクリーニング不良を起こ
すことなく実行可能になる。According to the invention described in claim 4, in addition to the effect obtained by the invention described in claim 1, the control means uses the contact / separation confirmation means to detect the first contact / separation detection means and the second contact / separation detection. After it is confirmed that the means has detected the separated state, the control means executes the second initial operation, so that the second initial operation for the intermediate transfer body is caused by mechanical abrasion of the intermediate transfer body. It can be executed without causing damage or poor cleaning.
【００９０】請求項５記載の発明によると、請求項１記
載の発明で得られる効果に加えて、接離確認手段によっ
て、第１の接離検知手段及び第２の接離検知手段が、離
間状態を検知していることが確認された後に、制御手段
によって画像形成動作が実行されるので、画像形成動作
を短時間で効率的に且つスムーズに行うことが可能にな
る。According to the invention of claim 5, in addition to the effect obtained by the invention of claim 1, the contact / separation confirming means separates the first contact / separation detecting means and the second contact / separation detecting means from each other. The image forming operation is executed by the control unit after it is confirmed that the state is detected, so that the image forming operation can be efficiently and smoothly performed in a short time.
【００９１】請求項６記載の発明によると、請求項１記
載の発明で得られる効果に加えて、画像形成動作終了毎
に、制御手段によって、感光体ドラムと中間転写体間及
び中間転写体と紙転写体間が離間状態にされるので、次
の画像形成動作開始時に、中間転写体が所望の待機位置
にあり、画像形成動作を短時間で効率的に且つスムーズ
に行うことが可能になる。According to the sixth aspect of the invention, in addition to the effect obtained by the first aspect of the invention, the control means causes the control unit to move between the photosensitive drum and the intermediate transfer body and between the intermediate transfer body and the intermediate transfer body each time the image forming operation is completed. Since the paper transfer members are separated from each other, the intermediate transfer member is at the desired standby position at the start of the next image forming operation, and the image forming operation can be efficiently and smoothly performed in a short time. .
【００９２】請求項７記載の発明によると、請求項１記
載の発明で得られる効果に加えて、制御手段が、ジャム
処理を含む異常処理終了後に、制御手段によつて、感光
体ドラムと中間転写体間及び中間転写体と紙転写体間が
離間状態にされるので、異常処理終了後の画像形成動作
をスムーズに継続することが可能になる。According to the invention described in claim 7, in addition to the effect obtained by the invention described in claim 1, after the abnormal processing including the jam processing is completed, the control means controls the photosensitive drum and the intermediate portion by the intermediate means. Since the transfer bodies are separated from each other and the intermediate transfer body and the paper transfer body are separated from each other, the image forming operation after the abnormal process is completed can be smoothly continued.
【図１】本発明の第１の実施例の全体構成を示す説明図
である。FIG. 1 is an explanatory diagram showing an overall configuration of a first embodiment of the present invention.
【図２】■図１の現像器部分の拡大説明図である。2 is an enlarged explanatory view of a developing device portion of FIG. 1. FIG.
【図３】図１の中間転写ベルト回りの拡大説明図であ
る。FIG. 3 is an enlarged explanatory diagram around the intermediate transfer belt in FIG.
【図４】図１の感光体ドラムと中間転写ベルトの接離機
構の説明図である。FIG. 4 is an explanatory diagram of a contact / separation mechanism between the photosensitive drum and the intermediate transfer belt of FIG.
【図５】図１の中間転写ベルトと紙転写部の接離機構の
説明図である。FIG. 5 is an explanatory diagram of a contact / separation mechanism between the intermediate transfer belt and the paper transfer unit in FIG.
【図６】図１に組み込まれる電気回路部のブロック図で
ある。6 is a block diagram of an electric circuit unit incorporated in FIG. 1. FIG.
【図７】同実施例の第１の初期動作を示すフローチャー
トである。FIG. 7 is a flowchart showing a first initial operation of the embodiment.
【図８】同実施例の第２の初期動作を示すフローチャー
トである。FIG. 8 is a flowchart showing a second initial operation of the same embodiment.
【図９】同実施例の接離チェック動作を示すフローチャ
ートである。FIG. 9 is a flowchart showing a contact / separation check operation of the embodiment.
【図１０】同実施例の感光体ドラムと中間転写ベルトの
離間動作を示すフローチャートである。FIG. 10 is a flowchart showing an operation of separating the photosensitive drum and the intermediate transfer belt of the same embodiment.
【図１１】同実施例の中間転写ベルトと紙転写部の離間
動作を示すフローチャートである。FIG. 11 is a flowchart showing a separating operation of the intermediate transfer belt and the paper transfer section of the embodiment.
【図１２】本発明の第２の実施例の接離チェック動作を
示すフローチャートである。FIG. 12 is a flowchart showing a contact / separation check operation according to the second embodiment of the present invention.
１ カラー画像読取り装置 ２ カラー画像記録装置 ９ 感光体ドラム １０ 感光体クリーニングユニット １１ 除電ランプ １２ 帯電器 １４ ｋ現像器 １５ Ｃ現像器 １６ Ｍ現像器 １７ Ｙ現像器 １９ 中間転写ベルト ２２ 中間転写ベルトクリーニングユニット ２４ 紙転写部 1 Color Image Reading Device 2 Color Image Recording Device 9 Photoreceptor Drum 10 Photoreceptor Cleaning Unit 11 Electrification Lamp 12 Charging Device 14 k Developing Device 15 C Developing Device 16 M Developing Device 17 Y Developing Device 19 Intermediate Transfer Belt 22 Intermediate Transfer Belt Cleaning Unit 24 Paper transfer unit
Claims (7)
ーをクリーニングし、除電後に均一に帯電する第１の初
期動作が施され、該第１の初期動作が施された前記感光
体ドラムの周面に、被形成画像の潜像が形成され、該潜
像がトナー像に現像され、 前記感光体ドラムに接離自在な中間転写体に対して、残
存トナーをクリーニングする第２の初期動作が施され、 該第２の初期動作が施された前記中間転写体に、前記感
光体ドラムのトナー像が中間転写され、前記中間転写体
に転写されたトナー像が、前記中間転写体に接離自在な
紙転写体に転写され定着されて画像形成が行われる画像
形成装置において、 前記感光体ドラムと前記中間転写体間の接離状態を検知
する第１の接離検知手段と、 前記中間転写体と前記紙転写体間の接離状態を検知する
第２の接離検知手段と、 前記第１の接離検知手段及び前記第２の接離検知手段の
接離状態を確認する接離確認手段と、 該確認手段の確認結果に基づいて、画像形成動作を制御
する制御手段とを有することを特徴とする画像形成装
置。1. A photosensitive drum, which has been subjected to a first initial operation of cleaning residual toner on the peripheral surface of the photosensitive drum and uniformly charging it after static elimination, and having undergone the first initial operation. A latent image of an image to be formed is formed on the peripheral surface of the latent image, the latent image is developed into a toner image, and the second initial stage for cleaning the residual toner on the intermediate transfer body that can be brought into contact with and separated from the photosensitive drum. The toner image on the photosensitive drum is intermediately transferred to the intermediate transfer body that has been subjected to the second initial operation, and the toner image transferred to the intermediate transfer body is transferred to the intermediate transfer body. In an image forming apparatus in which an image is formed by being transferred and fixed on a paper transfer body which can be freely contacted and separated, first contact and separation detection means for detecting a contact and separation state between the photosensitive drum and the intermediate transfer body, Detects the contact / separation state between the intermediate transfer body and the paper transfer body Second contact / separation detection means, contact / separation confirmation means for confirming the contact / separation state of the first contact / separation detection means and the second contact / separation detection means, and based on the confirmation result of the confirmation means, An image forming apparatus comprising: a control unit that controls an image forming operation.
制御手段が、電源投入時に前記接離確認手段によって、
前記第１の接離検知手段及び前記第２の接離検知手段
が、接触状態を検出していると確認されると、前記感光
体ドラムと前記中間転写体間及び前記中間転写体と前記
紙転写体間を離間状態にすることを特徴とする画像形成
装置。2. The image forming apparatus according to claim 1,
The control means, when the power is turned on, by the contact / separation confirmation means,
When it is confirmed that the first contact / separation detecting unit and the second contact / separation detecting unit detect the contact state, the space between the photosensitive drum and the intermediate transfer member and between the intermediate transfer member and the paper are detected. An image forming apparatus characterized in that transfer members are separated from each other.
制御手段が、前記接離確認手段によつて、前記第１の接
離検知手段が、離間状態を検知していることを確認後
に、前記第１の初期動作を実行することを特徴とする画
像形成装置。3. The image forming apparatus according to claim 1,
An image characterized in that the control means executes the first initial operation after the contact / separation confirmation means confirms that the first contact / separation detection means detects the separated state. Forming equipment.
制御手段が、前記接離確認手段によって、前記第１の接
離検知手段及び前記第２の接離検知手段が、離間状態を
検知していることを確認後に、前記第２の初期動作を実
行することを特徴とする画像形成装置。4. The image forming apparatus according to claim 1,
The control means executes the second initial operation after confirming by the contact / separation confirmation means that the first contact / separation detection means and the second contact / separation detection means detect the separated state. An image forming apparatus comprising:
制御手段が、前記接離確認手段によって、前記第１の接
離検知手段及び前記第２の接離検知手段が、離間状態を
検知していることを確認後に、画像形成動作を実行する
ことを特徴とする画像形成装置。5. The image forming apparatus according to claim 1,
The control means executes the image forming operation after confirming by the contact / separation confirmation means that the first contact / separation detection means and the second contact / separation detection means detect the separated state. A characteristic image forming apparatus.
制御手段が、画像形成動作終了毎に、前記感光体ドラム
と前記中間転写体間及び前記中間転写体と前記紙転写体
間を離間状態にすることを特徴とする画像形成装置。6. The image forming apparatus according to claim 1,
An image forming apparatus, wherein the control means sets the photosensitive drum and the intermediate transfer body and the intermediate transfer body and the paper transfer body in a separated state each time the image forming operation is completed.
制御手段が、ジャム処理を含む異常処理終了後に、前記
感光体ドラムと前記中間転写体間及び前記中間転写体と
前記紙転写体間を離間状態にすることを特徴とする画像
形成装置。7. The image forming apparatus according to claim 1,
An image forming apparatus, wherein the control means sets the photosensitive drum and the intermediate transfer body and the intermediate transfer body and the paper transfer body to a separated state after the abnormal processing including the jam processing is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14539895A JP3426056B2 (en) | 1995-05-20 | 1995-05-20 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14539895A JP3426056B2 (en) | 1995-05-20 | 1995-05-20 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08314290A true JPH08314290A (en) | 1996-11-29 |
| JP3426056B2 JP3426056B2 (en) | 2003-07-14 |
Family
ID=15384344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14539895A Expired - Fee Related JP3426056B2 (en) | 1995-05-20 | 1995-05-20 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3426056B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404999B1 (en) * | 1999-10-15 | 2002-06-11 | Hitachi, Ltd. | Image formation apparatus with determination of state of transfer device |
| US6839532B2 (en) * | 2001-12-03 | 2005-01-04 | Canon Kabushiki Kaisha | Image forming apparatus with improved conveying unit positioning |
| US7881634B2 (en) | 2006-08-23 | 2011-02-01 | Canon Kabushiki Kaisha | Image forming apparatus in which transfer member is movable toward and apart from image bearing member |
-
1995
- 1995-05-20 JP JP14539895A patent/JP3426056B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404999B1 (en) * | 1999-10-15 | 2002-06-11 | Hitachi, Ltd. | Image formation apparatus with determination of state of transfer device |
| US6839532B2 (en) * | 2001-12-03 | 2005-01-04 | Canon Kabushiki Kaisha | Image forming apparatus with improved conveying unit positioning |
| US7881634B2 (en) | 2006-08-23 | 2011-02-01 | Canon Kabushiki Kaisha | Image forming apparatus in which transfer member is movable toward and apart from image bearing member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3426056B2 (en) | 2003-07-14 |
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