Sheet Alignment Mechanism for Curved Paper Handling
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in accurately aligning sheets due to curvature caused by gravity and curling, leading to misalignment and reduced alignment accuracy.
Innovation Solution
The apparatus includes a pair of alignment members with inclined lower and upper support surfaces that are positioned to suppress sagging, ensuring the sheet is held securely and aligned accurately by maintaining contact with both edges, even when curved, through a configuration where the distance between the upper and lower support surfaces is shorter than the contact surface length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional alignment members with supporting portions are used, then the structure is simple, but the sheets sag downward between the supporting portions due to gravity and curling, causing misalignment
Solution Approach 1:
The patent transitions from a conventional single-plane supporting structure to a three-dimensional structure with both lower and upper portions. The lower portion supports the sheet from below while the upper portion prevents downward sagging from above, creating a multi-dimensional constraint system that effectively eliminates gravity-induced curvature and achieves high alignment accuracy.
2Manufacturing precision
If the alignment members are positioned to suppress sagging, then alignment accuracy improves, but the device complexity increases due to the additional upper portion structure
Solution Approach 1:
The alignment member is segmented into functionally distinct lower and upper portions. The lower portion handles sheet support while the upper portion specifically addresses sagging prevention. This segmentation allows each component to be optimized for its specific function, achieving high alignment accuracy through specialized structures.
3Productivity
If more sheets are aligned simultaneously, then productivity increases, but maintaining alignment accuracy becomes more difficult due to cumulative sagging effects
Solution Approach 1:
The upper portion of the alignment member acts as a counterbalancing element that opposes the downward gravitational force causing sheet sagging. By providing an upward constraint force at the upper portion, the system counteracts gravity's effect on multiple stacked sheets, enabling high-volume alignment while maintaining consistent alignment accuracy across all sheets.
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 configuration effectively prevents downward sagging and misalignment, enhancing the alignment accuracy and allowing for a higher number of sheets to be aligned without compromising processing speed or accessibility.
Implementation Method 1
the first lower portion is positioned above a lower end of the first contact surface in a gravity direction, and a distance between the first upper portion and the first lower portion in the gravity direction is smaller than a length of the first contact surface in the gravity direction
Data Source
AI summary
A sheet processing apparatus includes a conveyance member to convey a sheet, a pair of alignment members to move relatively in a width direction orthogonal to a conveyance direction of the sheet by the conveyance member, so as to align a position of the sheet in the width direction, and a lower portion to support a lower surface of the sheet between the pair of alignment members in the width direction. In addition, a pair of upper portions are arranged on one side and the other side of the lower portion in the width direction and each hold an upper surface of the sheet, wherein the pair of upper portions is positioned lower than the lower portion in a plane vertical to the conveyance direction.