Sheet Alignment Mechanism for Long Paper Stability
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Solution Overview
Problem
Conventional sheet processing apparatuses face difficulties in stably aligning sheets with long lengths, particularly those twice or more the length of predetermined-size sheets, due to inadequate support and alignment mechanisms.
Innovation Solution
The apparatus includes a conveyance portion, a sheet stacking portion, and an alignment unit with upstream and downstream pressing portions that support and align sheets by moving towards the center, ensuring stable alignment of both predetermined-size and large-size sheets through specific pressing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional supporting portions are used to support sheets, then short sheets can be aligned, but long sheets (twice or more the length of predetermined-size sheets) cannot be stably aligned
Solution Approach 1:
The downstream-side pressing portion is divided into multiple pressing portions arranged in the sheet conveyance direction. Each pressing portion presses a different region of the sheet (predetermined-size sheets vs. large-size sheets), allowing the alignment mechanism to handle both sheet types effectively by applying pressure at appropriate locations along the sheet length.
Solution Approach 2:
Different pressing portions are positioned at specific locations along the sheet conveyance direction to match the center of gravity positions of different sheet sizes. The first pressing portion targets the center of gravity region of predetermined-size sheets, while the second pressing portion targets the center of gravity region of large-size sheets, providing locally optimized pressing for each sheet type.
2Adaptability or versatility
If a single downstream-side pressing portion is used, then the structure is simple, but both predetermined-size sheets and large-size sheets cannot be aligned simultaneously
Solution Approach 1:
The downstream-side pressing portion is segmented into multiple pressing portions that can independently press different sheet sizes. This segmentation allows a single pressing mechanism to handle multiple sheet size categories without requiring completely separate pressing systems for each size.
Solution Approach 2:
The downstream-side pressing portion serves multiple functions by incorporating both the first pressing portion for predetermined-size sheets and the second pressing portion for large-size sheets. This multi-functional design allows one component to replace what would otherwise require multiple separate components.
Data Source
AI summary
The alignment unit includes: an upstream-side pressing portion that presses a side edge of the sheet; and a downstream-side pressing portion that presses the side edge of the sheet. The downstream-side pressing portion includes: a first pressing portion that is arranged downstream of the center of gravity of a predetermined-size sheet and upstream of the downstream edge of the predetermined-size sheet and that presses the predetermined-size sheet; and a second pressing portion that is arranged downstream of the downstream edge of the predetermined-size sheet and downstream of the center of gravity of a large-size sheet having twice or more than twice the length of the predetermined-size sheet and that presses the large-size sheet. The second pressing portion is formed to protrude further toward the center side in the width direction than the first pressing portion.