JP2021190991A5

JP2021190991A5 -

Info

Publication number: JP2021190991A5
Application number: JP2021010202A
Authority: JP
Filing date: 2021-01-26
Publication date: 2024-02-02

Description

本発明の一実施例による画像形成システムは、
第１シートに画像を形成する画像形成部と、
前記画像形成部によって前記画像が形成された前記第１シートを搬送する搬送手段と、
前記第１シートが搬送される搬送方向において前記搬送手段よりも下流に設けられた透明部材と、
前記第１シート上の前記画像を、前記搬送方向における読取位置において前記透明部材を介して読み取る読取センサを備える読取手段と、
前記透明部材に対して前記読取手段とは反対側に設けられ、前記読取位置において前記第１シートを挟持する第１ニップ部を前記透明部材と形成するバッキングローラと、
前記透明部材に対して前記読取センサとは反対側且つ前記透明部材上に設けられた基準部材と、
前記搬送方向に搬送される前記第１シートを前記第１ニップ部へ案内するガイド部材であって、前記基準部材を覆うガイド部材と、
前記基準部材を前記透明部材を介して前記読取手段が読み取ることによって得られた画像データに基づいて、前記第１シートの読み取り結果に対してシェーディング補正を行い、前記シェーディング補正が行われた画像に基づいて、前記画像形成部によって第２シート上に形成される前記画像の幾何特性を制御する制御手段と、
を有し、
前記画像形成部は、前記制御手段によって制御された前記幾何特性に基づいて、前記第２シート上に画像を形成し、
前記透明部材の第１平面は、前記基準部材が設けられる第１領域と、前記バッキングローラと前記第１ニップ部を形成する第２領域とを有することを特徴とする。

An image forming system according to an embodiment of the present invention includes:
an image forming unit that forms an image on the first sheet;
a conveyance means for conveying the first sheet on which the image is formed by the image forming section;
a transparent member provided downstream of the conveyance means in the conveyance direction in which the first sheet is conveyed ;
a reading unit that includes a reading sensor that reads the image on the first sheet through the transparent member at a reading position in the conveying direction;
a backing roller that is provided on a side opposite to the reading means with respect to the transparent member and forms a first nip portion with the transparent member to sandwich the first sheet at the reading position;
a reference member provided on the transparent member on a side opposite to the reading sensor with respect to the transparent member ;
a guide member that guides the first sheet conveyed in the conveyance direction to the first nip portion, the guide member covering the reference member;
Based on the image data obtained by the reading means reading the reference member through the transparent member , shading correction is performed on the reading result of the first sheet , and the image after the shading correction is performed. a control means for controlling geometric characteristics of the image formed on the second sheet by the image forming section based on;
has
The image forming unit forms an image on the second sheet based on the geometric characteristics controlled by the control means,
The first plane of the transparent member has a first area where the reference member is provided, and a second area that forms the first nip portion with the backing roller .

Claims

an image forming unit that forms an image on the first sheet;
a conveyance means for conveying the first sheet on which the image is formed by the image forming section;
a transparent member provided downstream of the conveyance means in the conveyance direction in which the first sheet is conveyed ;
a reading unit that includes a reading sensor that reads the image on the first sheet through the transparent member at a reading position in the conveying direction;
a backing roller that is provided on a side opposite to the reading means with respect to the transparent member and forms a first nip portion with the transparent member to sandwich the first sheet at the reading position;
a reference member provided on the transparent member on a side opposite to the reading sensor with respect to the transparent member ;
a guide member that guides the first sheet conveyed in the conveyance direction to the first nip portion, the guide member covering the reference member;
Based on the image data obtained by the reading means reading the reference member through the transparent member , shading correction is performed on the reading result of the first sheet , and the image after the shading correction is performed. a control means for controlling geometric characteristics of the image formed on the second sheet by the image forming section based on;
has
The image forming unit forms an image on the second sheet based on the geometric characteristics controlled by the control means,
The image forming system is characterized in that the first plane of the transparent member has a first area where the reference member is provided and a second area that forms the first nip portion with the backing roller .

The conveying means includes a first roller and a second roller forming a second nip portion with the first roller,
2. The upstream end of the guide member in the conveyance direction is located below a common tangent of the first roller and the second roller in the second nip. Image forming system.

The conveyance means is provided upstream of the transparent member in the conveyance direction,
In the conveyance direction, a conveyance guide is provided between the upstream end of the transparent member and the conveyance means to guide the first sheet being conveyed by the conveyance means to the transparent member,
3. The image forming system according to claim 1, wherein in the conveyance direction, an upstream end of the guide member is in contact with a downstream end of the conveyance guide.

The reading means includes a plurality of the reading sensors arranged in a staggered manner,
Any one of claims 1 to 3, wherein the reference member includes a plurality of reference members arranged in a staggered manner similar to the plurality of reading sensors so that the reference member can be read by the plurality of reading sensors. The image forming system according to item 1 .

The reference member is disposed upstream of the reading position in the transport direction,
Claims 1 to 4 , wherein the reading means is movable between the reading position and another reading position where the reading means reads the reference member through the transparent member. The image forming system according to any one of the items.

The image forming system according to any one of claims 1 to 5, wherein the reference member is a white reference plate.

7. The image forming system according to claim 1, wherein the reading sensor is a contact image sensor.

8. The image forming system according to claim 1, wherein the guide member is made of a conductive member and is grounded.

a conductive casing provided with the reading means and holding the transparent member ;
conductive holding means for biasing the guide member against the transparent member;
has
The image forming system according to claim 8 , wherein the guide member is grounded via the holding means and the housing .

10. The image forming system according to claim 9 , wherein the holding means is formed by a metal leaf spring.

In a width direction perpendicular to the conveyance direction, the width of the guide member is larger than the width of a sheet conveyance area in which the first sheet is conveyed;
11. The image forming system according to claim 9 , wherein the holding means is in contact with the guide member outside the sheet conveyance area in the width direction.

The backing roller is disposed facing the reading means located at the reading position ,
The image forming system further includes protrusions that are provided at both ends of the backing roller in a width direction perpendicular to the conveying direction and that come into contact with the transparent member to ensure a gap between the transparent member and the backing roller. Equipped with this roller ,
The image forming system according to any one of claims 9 to 11 , wherein the holding means is arranged close to the abutting roller.