JP2016099398A5

JP2016099398A5 -

Info

Publication number: JP2016099398A5
Application number: JP2014234083A
Authority: JP
Filing date: 2014-11-19
Publication date: 2017-12-28
Anticipated expiration: 2034-11-19

Description

本発明の一実施の形態による記録媒体に画像を形成する画像形成装置は、
回転可能な第１感光体と、
回転可能な第２感光体と、
前記第１感光体にトナー像を形成する第１画像形成部と、
前記第２感光体にトナー像を形成する第２画像形成部と、
前記第１感光体および前記第２感光体に当接離間可能に配置され、前記第１感光体および前記第２感光体に形成されたトナー像が転写される中間転写体と、
前記中間転写体が前記第１感光体および前記第２感光体に当接する全当接位置と、前記中間転写体が前記第１感光体に当接し、前記第２感光体から離間する一部当接位置と、前記中間転写体が前記第１感光体および前記第２感光体から離間する全離間位置とを切り替え可能な当接離間機構と、
を備え、
前記記録媒体に画像を形成する前に前記画像形成装置の状態を検知する検知動作における検知結果に基づいて、画像形成待機状態において前記当接離間機構により前記中間転写体を前記全当接位置または前記一部当接位置へ切り替え、前記第１感光体または前記第２感光体の交換が必要な状態であるときに、前記当接離間機構により前記中間転写体を前記全離間位置へ切り替える。 An image forming apparatus for forming an image on a recording medium according to an embodiment of the present invention includes:
A rotatable first photoreceptor;
A rotatable second photoreceptor;
A first image forming unit for forming a toner image on the first photoconductor;
A second image forming unit for forming a toner image on the second photoconductor;
An intermediate transfer member that is disposed so as to be in contact with and away from the first photosensitive member and the second photosensitive member, and onto which toner images formed on the first and second photosensitive members are transferred;
One of the the total contact position where the intermediate transfer member is brought into contact with the first photosensitive body and the second photosensitive member, the intermediate transfer member come into contact with the first photosensitive member, away from the second photoreceptor A contact / separation mechanism capable of switching between a part contact position and a total separation position where the intermediate transfer member is separated from the first photosensitive member and the second photosensitive member;
With
Based on the detection result in the detection operation of detecting the state of the image forming apparatus before forming an image on the recording medium, the intermediate transfer member is moved to the full contact position or the position by the contact / separation mechanism in the image formation standby state. the switching portion to a contact position, when the first is a condition that requires replacement of the photosensitive member or the second photosensitive member, switches the intermediate transfer member by the contact and separation mechanism to the full spacing position.

中間転写ベルト１０１と感光ドラム１０４の当接状態および離間状態を検知するために、ＣＰＵ６０１は、ＡＳＩＣ６０２及びセンサ駆動回路６０５を介して離間検知センサ６０６へ駆動信号を送信する。離間検知センサ６０６は、一次転写ローラ１１４の位置に従って透過と遮光が切り替わるように配置されたフォトセンサである。離間検知センサ６０６は、センサ駆動回路６０５からの駆動信号に応じて発光し、反射光を検出する。センサ出力検出回路６０７は、離間検知センサ６０６からの検出信号を受信し、検出信号をＣＰＵ６０１へ送信する。ＣＰＵ６０１は、センサ出力検出回路６０７からの検出信号に基づいて、中間転写ベルト１０１と感光ドラム１０４の当接状態および離間状態を判断する。 In order to detect the contact state and separation state of the intermediate transfer belt 101 and the photosensitive drum 104, the CPU 601 transmits a drive signal to the separation detection sensor 606 via the ASIC 602 and the sensor drive circuit 605. The separation detection sensor 606 is a photosensor arranged so that transmission and light shielding are switched according to the position of the primary transfer roller 114. The separation detection sensor 606 emits light according to the drive signal from the sensor drive circuit 605 and detects reflected light. Sensor output detection circuit 607 receives a detection signal from the separation detecting sensor 606 transmits a detection signal to the CPU 601. The CPU 601 determines the contact state and the separation state of the intermediate transfer belt 101 and the photosensitive drum 104 based on the detection signal from the sensor output detection circuit 607.

本実施例において、感光ドラム１０４が劣化した（寿命に近づいた）と判断されたときに、画像形成装置１００は、第３のモード（全離間状態）にされる。しかし、感光ドラム１０４の交換が発生しそうな不調が本体１１０に生じた場合、プロセスカートリッジ１０３の交換の必要性が高いエラーを検知した場合または画像不良を検知した場合、画像形成装置１００を第３のモード（全離間状態）へ切り替えてもよい。 In this embodiment, when it is determined that the photosensitive drum 104 has deteriorated (has approached the end of its life), the image forming apparatus 100 is set to the third mode (fully separated state). However, when a malfunction that may cause replacement of the photosensitive drum 104 occurs in the main body 110 , an error that requires high replacement of the process cartridge 103 is detected, or an image defect is detected, the image forming apparatus 100 is changed to the third one. May be switched to the mode (totally separated state).

Claims

An image forming apparatus for forming an image on a recording medium,
A rotatable first photoreceptor;
A rotatable second photoreceptor;
A first image forming unit for forming a toner image on the first photoconductor;
A second image forming unit for forming a toner image on the second photoconductor;
An intermediate transfer member that is disposed so as to be in contact with and away from the first photosensitive member and the second photosensitive member, and onto which toner images formed on the first and second photosensitive members are transferred;
One of the the total contact position where the intermediate transfer member is brought into contact with the first photosensitive body and the second photosensitive member, the intermediate transfer member come into contact with the first photosensitive member, away from the second photoreceptor A contact / separation mechanism capable of switching between a part contact position and a total separation position where the intermediate transfer member is separated from the first photosensitive member and the second photosensitive member;
With
Based on the detection result in the detection operation of detecting the state of the image forming apparatus before forming an image on the recording medium, the intermediate transfer member is moved to the full contact position or the position by the contact / separation mechanism in the image formation standby state. the switching portion to a contact position, when the first photosensitive member or a state it is necessary to replace the second photoreceptor, image forming for switching the intermediate transfer member by the contact and separation mechanism to the total separated position apparatus.

The image forming apparatus according to claim 1, wherein when it is determined that the first photoconductor needs to be replaced based on the detection result, the intermediate transfer body is switched to the fully separated position by the contact / separation mechanism.

The intermediate transfer member is switched to the partial contact position by the contact / separation mechanism in the image formation standby state when it is determined that the second photoconductor needs to be replaced based on the detection result. The image forming apparatus according to 1 or 2.

4. The image forming apparatus according to claim 1, wherein the first photosensitive member includes a single photosensitive member on which a black toner image is formed. 5.

5. The image forming apparatus according to claim 1, wherein the second photoconductor includes a plurality of photoconductors on which toner images of yellow, magenta, and cyan are respectively formed.

6. The detection operation according to claim 1, wherein the detection operation includes at least one of detection of a surface film thickness, the number of printed sheets, a video count value, or an accumulated number of rotations of the first photosensitive member and the second photosensitive member. The image forming apparatus described in 1.

The image forming apparatus according to claim 1, wherein the intermediate transfer body is switched to the fully separated position by the contact / separation mechanism before the shutdown of the image forming apparatus.