Adjustable Fixing Unit Nip Dynamics for Large-Width Sheet Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image forming apparatuses face inconvenience due to temperature differences between sheet-passing and non-sheet-passing areas in the fixing unit when large-width sheets are processed, leading to potential creasing and inefficiencies in production.
Innovation Solution
The apparatus includes a fixing unit with a first and second rotary member that form a nip part, where the second rotary member is adjusted to be displaced away from the first rotary member when a large-width sheet is processed, maintaining the nip part formation to minimize temperature differences and ensure efficient sheet passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large-width sheet is allowed to pass through the nip part after a small-width sheet, then the sheet width capacity is improved, but temperature difference between sheet-passing and non-sheet-passing areas causes creasing and quality degradation
Solution Approach 1:
The fixing unit dynamically adjusts the nip width based on the detected sheet width. When a large-width sheet is detected, the nip part is adjusted to increase its width, allowing the sheet to pass through without creasing while maintaining uniform temperature distribution and image fixing quality.
Solution Approach 2:
The physical parameter of the nip part (width) is changed in response to sheet width variations. By adjusting the nip width parameter to match the sheet width, the system prevents temperature differences from causing creasing while ensuring proper image fixing across the entire sheet surface.
2Adaptability or versatility
If the nip part width is increased to accommodate large-width sheets, then sheet passage capability is improved, but temperature equilibrium time increases, reducing production efficiency
Solution Approach 1:
The nip part width is dynamically adjusted only when large-width sheets are detected, rather than being fixed at a maximum width. This allows the system to maintain high production efficiency for small-width sheets while accommodating large-width sheets when needed, avoiding unnecessary temperature equilibrium waiting time.
Solution Approach 2:
The nip width parameter is changed on-demand based on sheet detection results. By adjusting the parameter only when necessary (when a large-width sheet is detected), the system maintains optimal processing speed for small-width sheets and avoids prolonged temperature equilibrium periods, thereby preserving production efficiency.
3Manufacturing precision
If the nip part is adjusted for each sheet width, then image fixing quality is improved, but device complexity increases
Solution Approach 1:
A sheet width detection mechanism provides feedback to the fixing unit control system. Based on this feedback, the nip part width is automatically adjusted to match the detected sheet width, ensuring uniform temperature distribution and image fixing quality without requiring complex manual adjustment mechanisms.
Solution Approach 2:
The fixing unit automatically adjusts its own nip width based on sheet width detection, eliminating the need for external manual intervention. This self-adjusting capability maintains high image fixing quality while avoiding the complexity of manual adjustment systems.
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 adjustment allows large-width sheets to pass through the nip part for fixing without creasing, while maintaining production efficiency by reducing the impact of temperature differences, thus avoiding the need to wait for temperature equilibrium.
Implementation Method 1
a fixing unit that includes a first rotary member and a second rotary member, which are in contact with each other to form a nip part, and that fixes the unfixed image formed in the image forming unit to the sheet by allowing the sheet to pass through the nip part
Data Source
AI summary
An image forming apparatus includes: an image forming unit that forms an unfixed image on a sheet; and a fixing unit that includes a first rotary member and a second rotary member, which are in contact with each other to form a nip part, and that fixes the unfixed image formed in the image forming unit to the sheet by allowing the sheet to pass through the nip part. When a large-width sheet having a larger width than a preceding sheet that has previously passed through the nip part is allowed to pass through the nip part, adjustment in which the first rotary member and the second rotary member are displaced in directions away from each other, while forming the nip part, is performed in the fixing unit.