JP2004020850A5

JP2004020850A5 -

Info

Publication number: JP2004020850A5
Application number: JP2002174767A
Authority: JP
Filing date: 2002-06-14
Publication date: 2004-11-04
Anticipated expiration: 2022-06-14

Description

【００１３】
また、請求項６に記載された発明は、画像形成部によって形成される互いに色の異なる複数のトナー像を、中間転写体上に多重に一次転写した後、当該中間転写体上に多重に一次転写された互いに色の異なる複数のトナー像を、二次転写ロールを突き当て部材に押圧させた二次転写部で記録媒体上に一括して二次転写することにより、画像を形成する画像形成装置において、前記二次転写ロールを対向部材に突き当てる突当力を、坪量が８０ｇｍｓ以下の記録媒体が二次転写部に突入したときに、当該二次転写ロールの突き当て部が離間する力より大きく、かつ、坪量が１６０ｇｍｓ以上の記録媒体が二次転写部に突入したときに、当該二次転写ロールの突き当て部が離間する力よりは小さく設定したことを特徴とする画像形成装置である。
さらに、請求項７に記載された発明は、画像形成部によって形成される互いに色の異なる複数のトナー像を、記録媒体上に転写することにより画像を形成する画像形成装置において、前記記録媒体を転写部に案内する案内部材に、当該記録媒体を屈曲させる屈曲部を設けたことを特徴とする画像形装置である。 [0013]
According to the sixth aspect of the present invention, the plurality of toner images of different colors formed by the image forming portion are primarily transferred in multiple primary transfer onto the intermediate transfer member, and then multiple primary images are transferred onto the intermediate transfer member. An image is formed by forming a plurality of transferred toner images different in color from one another on a recording medium at one time by a secondary transfer unit in which a secondary transfer roll is pressed against an abutting member to form an image. In the apparatus, when the recording medium having a basis weight of 80 gms or less rushes into the secondary transfer portion, the abutting portion of the secondary transfer roll is separated when an abutting force that abuts the secondary transfer roll against the opposing member When a recording medium having a basis weight of 160 gms or more is larger than the force and rushes into the secondary transfer portion, the image forming is characterized in that the force is set smaller than the force at which the abutting portion of the secondary transfer roll separates. It is an apparatus.
According to a seventh aspect of the present invention, there is provided an image forming apparatus for forming an image by transferring a plurality of toner images of different colors formed by an image forming portion onto a recording medium. The image forming apparatus is characterized in that a bending portion for bending the recording medium is provided in a guide member for guiding to the transfer portion.

Claims

A plurality of toner images of different colors formed by the image forming unit are primarily transferred onto an intermediate transfer member, and then the plurality of toner images of different colors are transferred onto the intermediate transfer member. In an image forming apparatus for forming an image by performing secondary transfer collectively on a recording medium at a secondary transfer portion,
An image forming apparatus, comprising: a guide member for guiding the recording medium to a secondary transfer portion of the intermediate transfer member, and a plurality of bending portions for bending the recording medium.

A guide member for guiding the recording medium to the secondary transfer portion of the intermediate transfer body, a first bending portion for bending the recording medium to the intermediate transfer body side, and a second bending portion for bending the recording medium to the secondary transfer roll side The image forming apparatus according to claim 1, wherein a bending portion is provided.

2. The image forming apparatus according to claim 1, wherein the guide member for guiding the recording medium to the secondary transfer portion of the intermediate transfer member is provided with a bending portion for bending the recording medium into a substantially S-shape.

The image forming apparatus according to claim 1, wherein a direction in which the guide member guides the recording medium is a direction along a conveyance path substantially upward in the vertical direction.

Among the guide members, the tip end portion of the guide member located on the intermediate transfer body side has an angle formed with the intermediate transfer body set at 40 degrees or less, and the tip end of the guide member located on the intermediate transfer body side is The image forming apparatus according to any one of claims 1 to 4, wherein the image forming apparatus is disposed apart from the secondary transfer portion.

A plurality of toner images of different colors formed by the image forming unit are primarily transferred onto an intermediate transfer member, and then the plurality of toner images of different colors are transferred onto the intermediate transfer member. In an image forming apparatus for forming an image by collectively and secondarily transferring on a recording medium at a secondary transfer portion in which a secondary transfer roll is pressed by an abutting member,
When the recording medium with a basis weight of 80 gms or less rushes into the secondary transfer portion, the contact force with which the secondary transfer roll is abutted against the opposing member is larger than the force with which the abutting portion of the secondary transfer roll separates. An image forming apparatus characterized in that when a recording medium having a basis weight of 160 gms or more rushes into the secondary transfer portion, the setting is made smaller than the force with which the abutting portion of the secondary transfer roll separates.

In an image forming apparatus for forming an image by transferring a plurality of toner images of different colors formed by an image forming unit onto a recording medium,
An image forming apparatus, comprising: a guide member for guiding the recording medium to the transfer portion; and a bending portion for bending the recording medium.