Dual Image Forming Units With Temperature-Based Misalignment Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses using multiple image forming units, temperature differences between units can cause misalignment of toner images due to thermal expansion and contraction, leading to increased misalignment when adjustments are based on a single temperature sensor.
Innovation Solution
The apparatus employs two temperature sensors, one for each image forming unit, and a detection device to form pattern images on a transport belt, allowing for independent misalignment adjustments based on temperature differences between the units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one temperature sensor is provided in the image forming apparatus and misalignment adjustment is performed based on only the temperature change at one location, then the device complexity is reduced, but the manufacturing precision of toner images deteriorates due to temperature difference between image forming units
Solution Approach 1:
The temperature sensing system is segmented into multiple independent sensors, with each sensor assigned to monitor a specific image forming unit. This segmentation allows for localized temperature monitoring and compensation, enabling precise misalignment adjustment for each unit while maintaining overall system manageability
Solution Approach 2:
Each image forming unit is equipped with its own temperature sensor to detect local temperature changes specific to that unit. This local quality approach ensures that temperature variations in one unit do not affect the accuracy of temperature detection in other units, enabling precise misalignment compensation for each unit based on its own thermal conditions
2Adaptability or versatility
If temperature difference between image forming units increases, then the adaptability to different thermal conditions is improved, but the manufacturing precision of toner images deteriorates due to increased misalignment difference
Solution Approach 1:
The system implements feedback control by continuously monitoring temperature differences between image forming units and automatically adjusting misalignment compensation parameters. When temperature differences exceed predetermined thresholds, the system performs misalignment adjustment based on detected temperature variations, ensuring precise toner image alignment despite varying thermal conditions
Solution Approach 2:
The misalignment compensation parameters are dynamically changed based on detected temperature differences between image forming units. The system adjusts alignment parameters in response to temperature variations, allowing each unit to be optimized for its specific thermal environment while maintaining overall image quality
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
This approach effectively reduces misalignment of toner images by accurately adjusting for temperature variations between image forming units, improving image quality and alignment precision.
Implementation Method 1
Components constituting each image forming unit expand due to a temperature rise inside the apparatus or contract due to a temperature drop
Implementation Method 2
Components constituting each image forming unit expand due to a temperature rise inside the apparatus or contract due to a temperature drop
Data Source
AI summary
An image forming apparatus includes: a first image forming unit that has a plurality of image forming sections and an intermediate transfer body to which toner images formed by the plurality of image forming sections are primarily transferred; a second image forming unit that is disposed adjacent to the first image forming unit and that has a plurality of image forming sections and an intermediate transfer body to which toner images formed by the plurality of image forming sections are primarily transferred; a transport belt that transports paper to a secondary transfer position at which the toner images respectively formed on the intermediate transfer bodies of the first image forming unit and the second image forming unit are secondarily transferred; a detection device that is provided downstream of the two secondary transfer positions in a transport direction in which the paper is transported by the transport belt and that detects pattern images formed by the toner images secondarily transferred onto the transport belt; a first temperature sensor that is disposed to detect a temperature around the first image forming unit; and a second temperature sensor that is disposed to detect a temperature around the second image forming unit, in which a processor is configured to: cause all the image forming sections of the first image forming unit and the second image forming unit to form the pattern images on the transport belt in a case where a temperature difference between a temperature detected by the first temperature sensor and a temperature detected by the second temperature sensor is equal to or greater than a first threshold set in advance; and adjust a misalignment of the toner images formed by the first image forming unit and the second image forming unit by using a detection result of the detection device.