JP2014112237A5

JP2014112237A5 -

Info

Publication number: JP2014112237A5
Application number: JP2013273163A
Authority: JP
Filing date: 2013-12-27
Publication date: 2014-10-23
Anticipated expiration: 2031-09-06

Description

本発明によれば、
用紙に測定用画像を形成する画像形成手段と、
前記測定用画像を加熱して前記用紙に定着させる定着手段と、
搬送経路に沿って前記用紙を搬送する搬送手段であって、前記定着手段を通過した前記用紙の搬送方向を反転する搬送手段と、
前記搬送手段により前記搬送方向が反転された前記用紙に定着された前記測定用画像の色を測定する測定手段と、
前記測定手段が前記測定用画像の測定を実行する場合において、前記用紙が前記定着手段を通過してから前記搬送手段により前記搬送方向が反転された前記用紙の後端が前記測定手段の測定位置を通過するまでの時間が、前記測定手段が前記測定用画像の測定を実行しない場合において、前記用紙が前記定着手段を通過してから前記搬送手段により前記搬送方向が反転された前記用紙の前記後端が前記測定位置を通過するまでの時間よりも長くなるように、前記搬送手段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が提供される。 According to the present invention,
Image forming means for forming an image for measurement on paper;
Fixing means for heating and fixing the measurement image to the paper;
A transport unit configured to transport the paper along a transport path, the transport unit configured to reverse the transport direction of the paper that has passed through the fixing unit;
Measuring means for measuring the color of the measurement image fixed on the paper whose transport direction is reversed by the transport means;
In the case where the measurement unit performs the measurement of the measurement image, the trailing edge of the sheet whose conveyance direction is reversed by the conveyance unit after the sheet has passed through the fixing unit is the measurement position of the measurement unit. In the case where the measurement means does not measure the measurement image, the time until the paper passes through the fixing means after the paper passes through the fixing means is the time when the paper is reversed in the conveyance direction by the conveyance means. There is provided an image forming apparatus comprising: a control unit configured to control the transport unit so that a time until a rear end passes through the measurement position is longer .

本発明によれば、測定対象物の色が温度によって変化するというサーモクロミズム現象を抑制し、高精度なカラーマッチングや色安定性を実現できる画像形成装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the thermochromism phenomenon that the color of a measuring object changes with temperature can be suppressed, and the image forming apparatus which can implement | achieve highly accurate color matching and color stability can be provided.

Claims

  Image forming means for forming an image for measurement on paper;
  Fixing means for heating and fixing the measurement image to the paper;
  A transport unit configured to transport the paper along a transport path, the transport unit configured to reverse the transport direction of the paper that has passed through the fixing unit;
  Measuring means for measuring the color of the measurement image fixed on the paper whose transport direction is reversed by the transport means;
  In the case where the measurement unit performs the measurement of the measurement image, the trailing edge of the sheet whose conveyance direction is reversed by the conveyance unit after the sheet has passed through the fixing unit is the measurement position of the measurement unit. In the case where the measurement means does not measure the measurement image, the time until the paper passes through the fixing means after the paper passes through the fixing means is the time when the paper is reversed in the conveyance direction by the conveyance means. An image forming apparatus comprising: a control unit configured to control the transport unit such that a time until a rear end passes through the measurement position is longer.

  A detection unit provided downstream of the fixing unit in the conveyance path and detecting the sheet conveyed by the conveyance unit;
  A measuring unit that measures a time elapsed since the detection unit detected the paper;
  The transport means reverses the transport direction of the paper by switching back the paper transported to the reversing part of the transport path,
  When the measurement is performed by the measurement unit, the control unit waits the sheet conveyed to the reversing unit by the conveyance unit until the time measured by the measurement unit reaches a standby time. The image forming apparatus according to claim 1.

An acquisition means for acquiring information relating to the surface property of the paper;
The image forming apparatus according to claim 2, wherein the waiting time is determined based on the information related to the surface property of the paper.

An acquisition means for acquiring information relating to the basis weight of the paper;
The image forming apparatus according to claim 2, wherein the waiting time is determined based on the information related to a basis weight of the paper.

An acquisition means for acquiring information on the thickness of the paper;
The image forming apparatus according to claim 2, wherein the waiting time is determined based on the information regarding the thickness of the paper.

In the case where the measurement is performed by the measurement unit, the control unit is configured to measure the speed at which the sheet reversed by the conveyance unit is conveyed by the conveyance unit. 2. The image forming apparatus according to claim 1, wherein the sheet reversed by the step is slower than a speed at which the sheet is conveyed by the conveying unit.

The image forming apparatus according to claim 1, wherein the measurement unit includes four sensors arranged in a direction orthogonal to a conveyance direction of the sheet conveyed along the conveyance path. .