Rotating Member Sheet Stacking Rear End Alignment
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Solution Overview
Problem
Conventional sheet processing apparatuses face issues with rear end remaining of sheet bundles after ejection, leading to unstable stacking and potential drop of subsequent bundles, which existing techniques such as scraping-off members or detection unit-based systems fail to completely address.
Innovation Solution
A sheet processing apparatus with an ejection section, sheet stacking section, abutting unit, driving section, control section, and rotating member that rotates after the sheet stacking section is lowered to abut and pass through the gap in the abutting unit, ensuring the rear end of the sheet bundle is flattened and aligned, preventing rear end remaining and enabling stable stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ejection tray is lowered to maintain constant fall distance of ejected sheet bundles, then the stacking position consistency is improved, but rear end remaining occurs causing unstable stacking
Solution Approach 1:
The rotating member performs preliminary action by rotating before the sheet bundle is fully stacked to push the rear end downward, preventing rear end remaining before it causes stacking instability. This proactive approach maintains both position consistency and stacking stability.
Solution Approach 2:
The rotating member acts as an intermediary mechanism between the ejection tray and the sheet bundle rear end. It transfers the pushing force to the rear end portion, enabling controlled downward movement without requiring direct contact or complex structures.
2Object-affected harmful factors
If a scraping-off member is used to scrape off the rear end of sheets, then rear end rise is prevented, but rear end remaining caused by tray lowering is not completely solved
Solution Approach 1:
The rotating member provides dynamic action by rotating to push the rear end downward, adapting to the condition changes during tray lowering. This dynamic approach completely eliminates rear end remaining, unlike static scraping-off members.
Solution Approach 2:
Instead of scraping off the rear end horizontally, the rotating member pushes it downward vertically. This inverted approach directly addresses the root cause of rear end remaining during tray lowering, providing complete solution.
3Measurement precision
If the ejection tray is lowered to a position where sheet is not detected by detection unit, then detection accuracy is improved, but rear end remaining persists
Solution Approach 1:
The rotating member serves as an intermediary that acts on the sheet bundle rear end independently of the detection unit's position. It pushes the rear end downward to eliminate remaining, allowing the detection unit to be positioned optimally for accuracy without compromising stacking stability.
Data Source
AI summary
A sheet processing apparatus, including an ejection section; a sheet stacking section; an abutting unit; a driving section; a control section; and a rotating member which has a rotating shaft in parallel with a width direction of the sheet bundle and is held so as to rotate from above the base end portion of the sheet stacking section through a gap of a predetermined width in the abutting unit. The control section starts rotation of the rotating member after lowering of the sheet stacking section is stopped, and when the rotation is started, the rotating member operates so as to abut a rear portion of a surface of the sheet bundle stacked on the sheet stacking section and pass through the gap in the abutting unit.