JP2013083800A5

JP2013083800A5 -

Info

Publication number: JP2013083800A5
Application number: JP2011223767A
Authority: JP
Filing date: 2011-10-11
Publication date: 2014-11-27

Description

本発明は、第１回転体と、前記第１回転体を回転駆動する第１駆動手段と、前記第１回転体と当接する第２回転体と、前記第２回転体を回転駆動する第２駆動手段と、前記第１回転体と前記第２回転体との当接部でトナー像の転写を行う転写手段と、を備えた画像形成装置において、前記第２回転体を前記第１回転体に接離させる接離機構と、前記第２回転体が前記第１回転体に接触した状態と、前記第２回転体が前記第１回転体から離間した状態との、前記第２回転体の駆動トルクの差分を検知するトルク検知手段と、前記トルク検知手段により検知する値が所定の範囲となるように、前記第２回転体の駆動トルクを制御するトルク制御手段と、を有する、ことを特徴とする画像形成装置にある。 The present invention provides a first rotating body, first driving means for rotationally driving the first rotating body, a second rotating body in contact with the first rotating body, and a second for rotationally driving the second rotating body. An image forming apparatus comprising: a driving unit; and a transfer unit configured to transfer a toner image at a contact portion between the first rotating body and the second rotating body, wherein the second rotating body is the first rotating body. An approach / separation mechanism that contacts and separates the first rotating body, a state in which the second rotating body is in contact with the first rotating body, and a state in which the second rotating body is separated from the first rotating body. Torque detecting means for detecting a difference in driving torque, and torque control means for controlling the driving torque of the second rotating body so that a value detected by the torque detecting means falls within a predetermined range. The image forming apparatus is characterized.

Claims

A first rotating body;
First driving means for rotationally driving the first rotating body;
A second rotating body in contact with the first rotating body;
Second driving means for rotationally driving the second rotating body;
An image forming apparatus comprising: a transfer unit that transfers a toner image at a contact portion between the first rotating body and the second rotating body;
An approach / separation mechanism for contacting / separating the second rotating body with the first rotating body;
Torque detection for detecting a difference in driving torque of the second rotating body between a state in which the second rotating body is in contact with the first rotating body and a state in which the second rotating body is separated from the first rotating body. Means,
Torque control means for controlling the drive torque of the second rotating body so that the value detected by the torque detection means falls within a predetermined range;
An image forming apparatus.

The torque control means includes
A torque limit mechanism that initially sets the value detected by the torque detection means to be within the predetermined range, and that limits the driving force by the second drive means;
When the value detected by the torque detection means deviates from the predetermined range due to use, the torque detection means comes into contact with the second rotation body separately from the first rotation body and the second drive means. A contact body that exchanges torque with the second rotating body so that the value detected by
The image forming apparatus according to claim 1, wherein:

The contact body is a third rotating body that is rotatable in a direction along a rotational driving direction of the second rotating body,
The third rotating body has third driving means capable of rotationally driving the rotation direction and the rotation speed variably,
The torque control means controls the third drive means based on the value detected by the torque detection means;
The image forming apparatus according to claim 2, wherein:

A cleaning blade that contacts the second rotating body and removes toner adhering to the second rotating body;
A fur brush arranged upstream of the cleaning blade in the rotation direction of the second rotating body and leveling toner adhering to the second rotating body;
The third rotating body is the fur brush;
The image forming apparatus according to claim 3, wherein:

The second rotating body includes an endless belt, and a tension roller that applies tension to the belt,
The torque detecting means includes a displacement detecting means for detecting a displacement amount of the tension roller, and the state where the belt is in contact with the first rotating body and the state where the belt is separated from the first rotating body. The difference of the driving torque of the second rotating body is obtained from the displacement amount of the tension roller.
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.

The first rotating body is an image carrier that carries a toner image;
The second rotating body is a recording material conveying unit that forms a nip portion in contact with the image carrier and conveys the recording material so as to pass through the nip portion.
The transfer unit transfers the toner image on the image carrier to a recording material at the nip portion;
The image forming apparatus according to claim 1 , wherein the image forming apparatus is an image forming apparatus.

The first rotating body is an image carrier that carries a toner image;
The second rotating body is an intermediate transfer body that is in contact with the image carrier and carries a toner image transferred from the image carrier,
The transfer unit transfers a toner image on the image carrier to the intermediate transfer member at a contact portion between the image carrier and the intermediate transfer member;
Characterized in that, the image forming apparatus according to any one of claims 1 to 5.