Sheet Feeding Device Color Contrast for Alignment
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Solution Overview
Problem
Conventional sheet feeding devices in image forming apparatuses struggle to detect and correct sheet inclination, leading to misalignment and wrinkles due to the difficulty in recognizing sheet orientation, especially when the sheet width is smaller than the regulating members' setting, causing stress and potential image misalignment or wrinkles.
Innovation Solution
The introduction of a sheet feeding device with movable regulating members featuring contrasting color or pattern indicating portions on the supporting and regulation surfaces, which enhance visibility of sheet alignment, allowing users to correct sheet orientation accurately, thereby preventing misalignment and wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sheet regulating members are positioned to match the sheet width, then the sheet can be fed correctly, but it is difficult for the user to recognize when the sheet is installed obliquely due to lack of visual indication
Solution Approach 1:
The patent applies color indication portions with different brightness values (7 or less for supporting surface, higher than 7 for regulation surface) to create visual contrast that helps users recognize sheet orientation and alignment status
Solution Approach 2:
The patent introduces color indication portions at specific locations (end portions of supporting and regulation surfaces) rather than uniform coloring, providing localized visual information where it is most needed for alignment recognition
2Adaptability or versatility
If the sheet width is smaller than the interval between regulating members, then the sheet can fit through, but the sheet may be installed obliquely and fed with misalignment
Solution Approach 1:
The color indication portions provide visual feedback that helps users detect oblique installation even when sheets of varying widths are used, maintaining alignment precision across different sheet sizes
Solution Approach 2:
The visual feedback from the color indication portions allows users to adjust sheet placement in real-time, ensuring proper alignment before feeding regardless of sheet width variations
3Productivity
If the sheet is installed obliquely, then feeding may occur, but image misalignment and wrinkles occur due to stress from the skew feeding correction unit
Solution Approach 1:
The color indication portions provide preliminary visual guidance before sheet feeding occurs, allowing users to correct oblique installation before it causes image misalignment or wrinkles
Solution Approach 2:
The visual indication system prevents oblique installation by providing early warning, countering the potential harm of misalignment before it occurs during the feeding process
Data Source
AI summary
A sheet feeding device includes a sheet supporting unit, a sheet feeding unit, and a regulating member. The regulating member includes a supporting surface portion on which the sheet is placed, and a regulation surface portion provided continuously with the supporting surface portion and configured to regulate the position of the sheet in a width direction. The supporting surface portion includes a supporting surface color indicating portion including an end portion of the supporting surface portion on a side of the regulation surface portion and having a color with brightness of 7 or less in the Munsell color system. The regulation surface portion includes a regulation surface color indicating portion including an end portion of the regulation surface portion on a side of the supporting surface portion and having a color with brightness higher than the brightness of the supporting surface color indicating portion.