Ink Jet Recording Apparatus Non-Contact Moisture Sensor
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Solution Overview
Problem
Ink jet recording methods face issues with image defects due to excessive liquid absorption by the recording medium, leading to curing or cockling, and contact-type moisture sensors can scratch the surface of liquid removal rollers, reducing efficiency.
Innovation Solution
An ink jet recording apparatus with a liquid absorbing device using a porous body to absorb the aqueous liquid component from the image, followed by heat drying and temperature measurement to determine the device's operating state, preventing excessive liquid absorption and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact-type moisture sensor is repeatedly brought into contact with the surface layer of a roller for liquid removal, then the water content measurement is achieved, but the surface layer of the roller is scratched and liquid removal efficiency is reduced
Solution Approach 1:
The patent introduces a non-contact type moisture sensor that measures water content through electromagnetic radiation (microwave or infrared) without physical contact with the roller surface. This intermediary measurement method eliminates direct contact between the sensor and roller, preventing surface scratching while maintaining measurement capability
Solution Approach 2:
The patent replaces the mechanical contact-type moisture sensor with a non-contact type sensor that uses electromagnetic fields (microwave or infrared radiation) to measure water content. This substitution eliminates mechanical contact and associated wear, while providing continuous monitoring capability
2Quantity of substance
If the recording medium excessively absorbs liquid component in the ink, then the liquid component is removed from ink, but curing or cockling occurs
Solution Approach 1:
The patent implements a feedback control system where a non-contact moisture sensor continuously monitors the water content in the ink image on the transfer body. Based on this real-time measurement, the control unit adjusts the liquid removal roller's suction force or contact pressure to maintain optimal liquid removal without causing recording medium damage
Solution Approach 2:
The patent dynamically adjusts liquid removal parameters (such as suction force, contact pressure, or roller speed) based on real-time moisture content measurements. This parameter adjustment ensures adequate liquid removal to prevent cockling while avoiding excessive removal that would cause curing or image defects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively prevents image defects by controlling the liquid absorption process, ensuring reliable operation and maintaining the integrity of the liquid absorbing device.
Implementation Method 1
a porous body having a first surface configured to come into contact with the first image, the porous body being configured to absorb at least a part of the aqueous liquid component from the first image
Implementation Method 2
a heat drying device configured to perform a heat drying treatment of the second image
Data Source
AI summary
Provided is a highly reliable ink jet recording apparatus capable of preventing the occurrence of image defects. The ink jet recording apparatus includes a liquid absorbing device including a porous body configured to absorb/remove an aqueous liquid component from an image containing the aqueous liquid component and a coloring material, a heat drying device configured to perform a heat drying treatment of the image after being subjected to the liquid absorption treatment, a temperature measuring device configured to measure the temperature of the image after being subjected to the heat drying treatment with the heat drying device, and a determination unit configured to determine the state of the liquid absorbing device from the measured temperature.