Fixing Device Pressure-Applying Member Adaptation for Media Thickness
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Solution Overview
Problem
Existing image fixation technologies experience fluctuations in fixation performance due to movement of pressure applying members when handling different thicknesses of recording mediums, leading to inconsistent image quality.
Innovation Solution
A fixing device with a pressure applying member that is movable and restricted by a restriction portion, ensuring consistent fixation performance across various thicknesses of recording mediums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressure applying member is made movable to accommodate different recording medium thicknesses, then fixation capability on thick recording mediums is improved, but fixation performance fluctuates due to driving force variations
Solution Approach 1:
The pressure applying member is designed to be movable rather than fixed, allowing it to dynamically adjust its position to accommodate different recording medium thicknesses. This dynamic structure enables the member to move closer to or farther from the pressing member based on the thickness of the recording medium being processed, thereby maintaining effective fixation capability across various thicknesses while the restriction portion ensures the movement remains controlled and consistent
Solution Approach 2:
The position of the pressure applying member is changed as a variable parameter that can be adjusted according to recording medium thickness. By allowing the distance between the pressure applying member and pressing member to vary within controlled limits, the system adapts to different thicknesses while the restriction portion maintains parameter stability to prevent fixation performance fluctuations
2Reliability
If the pressure applying member is restricted to prevent movement, then fixation performance consistency is improved, but fixation capability on thick recording mediums deteriorates
Solution Approach 1:
Rather than completely restricting the pressure applying member, the design allows controlled movement within specific limits defined by the restriction portion. This partial dynamic freedom enables accommodation of thick recording mediums while the restriction prevents excessive movement that would cause performance fluctuations, achieving a balance between adaptability and consistency
Solution Approach 2:
The movement freedom of the pressure applying member is segmented into allowed ranges and restricted zones. The restriction portion creates discrete boundaries that permit movement necessary for thick medium fixation while blocking movement that would harm fixation consistency, effectively dividing the movement space into functional zones
Data Source
AI summary
A fixing device includes a moving member that circularly moves, a pressure applying member that is disposed to be in contact with an outer peripheral surface of the moving member, that is used to press a recording medium on which an image is formed, that rotates as the pressure applying member receives a driving force from a drive source, and that presses the recording medium passing through a contact portion between the outer peripheral surface and the pressure applying member, a pressing member that is disposed inside the moving member, that is urged toward the pressure applying member, that is pressed against the pressure applying member with the moving member interposed therebetween, and that is provided to be movable in a direction away from the pressure applying member, and a restriction portion that restricts movement of the pressure applying member that is caused to move in a direction away from the outer peripheral surface of the moving member as the driving force is transmitted from the drive source to the pressure applying member.