Sheet Stacker Guide and Downstream Air Blower for Alignment
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Solution Overview
Problem
Existing sheet stackers in image forming systems face issues with air blown from above causing sheets to fall off during the stacking process, leading to inefficiencies in sheet alignment and stacking accuracy.
Innovation Solution
A sheet stacker design incorporating a guide portion to receive and guide the leading end of sheets and an air blower positioned above the sheet stacking portion to blow air downstream, effectively removing air between sheets and preventing them from falling, while adjusting air volume based on sheet weight for reliable stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If air is blown toward sheets from above to remove air between sheets, then air removal is improved, but sheets fall off during stacking
Solution Approach 1:
The air blower is positioned to blow air specifically at the downstream side of the sheet conveyance direction, targeting the air gap between sheets locally rather than blowing from above the entire sheet stack. This localized air application removes air between sheets while avoiding disruption to sheet stability during stacking.
Solution Approach 2:
The guide portion receives and guides the leading end of the sheet before it reaches the stacking position. This preliminary guidance ensures the sheet is properly positioned and stable before air blowing occurs, preventing sheets from falling off during the stacking process.
2Manufacturing precision
If air volume is increased to remove air between sheets more effectively, then stacking accuracy is improved, but sheets become unstable and may fall
Solution Approach 1:
Air is blown locally at the downstream side where air gaps between sheets are most problematic, rather than applying high-volume air across the entire sheet stack. This localized approach achieves effective air removal with lower overall air volume, maintaining sheet stability.
Solution Approach 2:
The guide portion acts as an intermediary that receives and guides the leading end of sheets, ensuring proper positioning and stability. This intermediary structure allows effective stacking with controlled air blowing that doesn't compromise sheet stability.
3Manufacturing precision
If a guide portion is added to receive and guide sheets, then sheet alignment is improved, but device complexity increases
Solution Approach 1:
The sheet stacking function is divided into distinct segments: the guide portion for receiving and guiding the leading end of sheets, and the air blower for removing air between sheets. This segmentation allows each component to perform its specific function efficiently while maintaining overall system simplicity.
Solution Approach 2:
The guide portion serves as a simple intermediary structure that facilitates sheet alignment without requiring complex mechanisms. It receives the leading end of sheets and guides them downstream, achieving accurate alignment with minimal structural 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 solution ensures accurate sheet alignment and stacking by removing air between sheets, preventing them from falling and ensuring reliable stacking by adjusting air volume according to sheet weight, resulting in improved sheet stacking efficiency and accuracy.
Implementation Method 1
an air blower disposed above the sheet stacking portion and configured to blow air toward the sheet on a downstream side, in the sheet conveyance direction
Data Source
AI summary
A sheet stacker includes a sheet stacking portion, a guide portion, and an air blower. The sheet stacking portion is configured to stack a sheet bundle. The guide portion is configured to receive a leading end of a sheet conveyed toward the sheet stacking portion and guide the sheet downstream in a sheet conveyance direction in which the sheet is conveyed. The air blower is disposed above the sheet stacking portion and configured to blow air toward the sheet on a downstream side, in the sheet conveyance direction, from a position at which the guide portion receives the leading end of the sheet.