Post-processing Device Dynamic Ejection Tray for Noise Reduction
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Solution Overview
Problem
Existing image forming apparatuses face challenges in efficiently processing and stacking sheets with and without binding, leading to noise generation and potential stacking failures due to the interaction between the clamping member and the sheets during the binding process.
Innovation Solution
A post-processing device with a processing stacking portion, a binding member, a medium ejection portion, and a pressing member that adjusts its position based on whether the sheets have undergone binding, ensuring proper alignment and separation to minimize noise and stacking failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the clamping member is positioned to press media on the medium ejection portion, then media alignment is improved, but noise is generated when the clamping member contacts bound media
Solution Approach 1:
The medium ejection portion is designed to move upward and downward dynamically according to the amount of media stacked on it. When bound media are detected (which have different thickness characteristics), the medium ejection portion rises, causing the clamping member to lift away and avoid contact, thus eliminating noise while maintaining alignment function for unbound media
2Manufacturing precision
If the clamping member contacts media on the medium ejection portion, then media alignment is improved, but stacking failures occur when bound media are present
Solution Approach 1:
The dynamic movement of the medium ejection portion based on media stack height allows the system to automatically adapt to the presence of bound media. When bound media are detected through thickness sensing, the medium ejection portion rises, causing the clamping member to retract and avoid contact that would cause stacking failures
Solution Approach 2:
The system uses thickness detection to sense the difference between bound and unbound media, providing feedback to control the medium ejection portion's position. This feedback mechanism ensures the clamping member only contacts unbound media, preventing stacking failures while maintaining alignment
3Device complexity
If the medium ejection portion remains stationary, then device complexity is reduced, but noise and stacking failures increase due to clamping member contact with bound media
Solution Approach 1:
The medium ejection portion utilizes its own weight and the gravitational force to move upward and downward automatically according to the media stack height. This self-service mechanism eliminates the need for complex external actuators, reducing device complexity while achieving the noise-reducing function through passive adaptive positioning
Data Source
AI summary
A post-processing device includes a processing stacking portion that allows media to be stacked thereon; a binding member that performs a binding process on the media; a medium ejection portion on which the media ejected from the processing stacking portion are stacked and which moves upward and downward; and a pressing member that presses an upper surface of the media on the medium ejection portion. When media that have not been subjected to the binding process are stacked on the medium ejection portion, the pressing member and the media are brought into contact with each other. When media that have been subjected to the binding process are stacked on the medium ejection portion, the pressing member and the media are disposed further away from each other than when media that have not been subjected to the binding process are stacked on the medium ejection portion.