Sheet Feeding Mechanism Restriction Member Distortion Control
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Solution Overview
Problem
Existing sheet feeding mechanisms for recording mediums suffer from distortion issues when fed along an inclined surface, particularly with low-stiffness materials like thin paper, due to uneven bending and pressure from contact members, which affects the feeding orientation and leads to wrinkles.
Innovation Solution
A sheet feeding mechanism with a sheet feeding roller and an inclined portion, accompanied by a restriction member that contacts the recording medium only after it starts curving along the inclined surface, reducing distortion without increasing the sheet feeding load, and is designed to maintain even bending across the width of the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a sheet feeding roller presses the center portion of the recording medium to convey it along an inclined surface, then the recording medium is fed in the conveyance direction, but the recording medium becomes distorted with uneven bending at the center and ends
Solution Approach 1:
The invention divides the single pressing function into two separate components: the sheet feeding roller that presses the center portion and the restriction members that press the end portions. This segmentation allows independent control of pressure application points, enabling the center to be conveyed while the ends are restricted from excessive bending, thus reducing distortion during conveyance along the inclined surface.
Solution Approach 2:
The invention applies different pressing characteristics to different locations on the recording medium. The sheet feeding roller applies pressing force at the center portion to enable conveyance, while the restriction members apply pressing force at the end portions to restrict bending. This local differentiation of pressing quality ensures that each region of the recording medium receives the appropriate force to achieve both conveyance and distortion reduction.
2Stability of the object's composition
If contact members are provided to prevent movement of the recording medium, then the recording medium is stabilized, but the sheet feeding load increases
Solution Approach 1:
The restriction members are positioned to contact the end portions of the recording medium before the sheet feeding roller begins conveyance. This preliminary action stabilizes the recording medium in advance, preventing excessive bending and movement during the subsequent conveyance process, thereby reducing the overall force required for feeding while maintaining stability.
3Shape
If driven rollers are provided to press the recording medium from both sides, then the conveyance difference between right and left sides is reduced, but the device complexity increases
Solution Approach 1:
The invention combines the functions of multiple rollers into a single restriction member structure. Instead of using separate driven rollers on both sides, the restriction member integrates the pressing function at the end portions into one component that works in conjunction with the sheet feeding roller, achieving conveyance uniformity with fewer parts and reduced device complexity.
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
The mechanism effectively reduces distortion and maintains the recording medium's orientation, preventing wrinkles and ensuring smooth feeding without increasing the load on the sheet feeding system, particularly effective for low-stiffness materials.
Implementation Method 1
the sheet feeding roller and the driven rollers contact the recording medium to press the recording medium
Implementation Method 2
a recording medium 108 to be fed with a sheet feeding roller 110 contacts an inclined part 111 and the recording medium 108 is curved upward and conveyed
Implementation Method 3
a restriction member 26 that is deformable and that contacts the recording medium 8 to restrict distortion of the recording medium 8
Data Source
AI summary
A sheet feeding mechanism includes a sheet feeding roller configured to feed an uppermost recording medium from stacked recording mediums, an inclined portion located at a downstream position of the sheet feeding roller in a conveyance direction of the recording medium and having a surface inclined with respect to the conveyance direction, and a restriction member configured not to contact the recording medium before the sheet feeding roller feeds the recording medium, and configured to contact the recording medium in a state where the recording medium is fed by the sheet feeding roller and conveyed along the inclined portion.