Medium-Width Heating Control to Suppress Inkjet Image Distortion
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Solution Overview
Problem
Existing image forming apparatuses experience image distortion due to uneven thermal expansion of the medium along the width direction, as only the ink adhesion area is heated, leading to differences in thermal expansion across the width of the medium.
Innovation Solution
The apparatus includes a guide portion with bulging central guide surfaces and a control mechanism to determine and drive heating elements based on the medium's width and image forming area, ensuring uniform thermal expansion by selectively heating areas beyond the ink adhesion zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If only the ink adhesion area is heated, then energy consumption is reduced and drying efficiency is improved, but image distortion occurs due to uneven thermal expansion across the medium width
Solution Approach 1:
The patent applies local quality by selectively activating specific heating elements based on the detected medium width. The control unit determines which heating elements should be operated to provide uniform heating across the actual medium width, rather than uniformly heating all heating elements. This localized heating approach reduces energy consumption while preventing image distortion by ensuring even thermal expansion across the medium surface.
Solution Approach 2:
The patent changes the operational parameters of the heating elements based on detected medium width. The control unit adjusts which heating elements are activated and at what power levels, dynamically adapting the heating pattern to match the actual medium dimensions. This parameter adjustment ensures uniform thermal expansion while optimizing energy consumption for different medium widths.
2Ease of operation
If a fixed pattern of heating elements is always driven, then control simplicity is maintained, but image distortion occurs when medium width varies
Solution Approach 1:
The patent introduces dynamic adaptability to the heating control system. The control unit detects the actual medium width and dynamically adjusts which heating elements are activated based on this detection. This dynamic adjustment allows the system to adapt to varying medium widths while maintaining uniform thermal expansion, resolving the contradiction between control simplicity and image quality.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit detects the medium width and uses this information to adjust the heating element activation pattern. The detection result feeds back into the control decision, allowing the system to automatically adapt to different medium widths and maintain uniform heating across the surface, preventing image distortion while keeping control logic relatively simple.
3Manufacturing precision
If heating elements are selectively driven based on medium width detection, then uniform thermal expansion is achieved suppressing image distortion, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the heating system to automatically detect medium width and self-adjust the heating element activation pattern without external intervention. The control unit autonomously determines the appropriate heating configuration based on detected medium dimensions, reducing the need for complex external control mechanisms while achieving uniform thermal expansion and suppressing image distortion.
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 suppresses image distortion and wrinkles by maintaining uniform thermal expansion across the medium, enhancing image quality and reducing deformations.
Implementation Method 1
uneven thermal expansion of the medium along the width direction
Implementation Method 2
the medium is heated in order to dry the ink that has been ejected onto the medium
Implementation Method 3
the medium is heated in order to dry the ink that has been ejected onto the medium
Data Source
AI summary
The image forming apparatus includes an ejection portion, a guide portion, a plurality of heating elements, a determination processing portion, and a drive control portion. The ejection portion ejects ink toward a first surface of a strip-shaped medium. The guide portion is provided at a position sandwiching the medium between the guide portion and the ejection portion, and forms a guide surface that guides the medium by coming into contact with a second surface on a rear side of the first surface of the medium. The plurality of heating elements are arranged along a width direction of the medium below the guide surface. The determination processing portion determines the heating elements to be driven based on the width of the medium. The drive control portion drives the heating elements determined by the determination processing portion as heating elements to be driven.