Sheet Delivery Roller Projection Noise Reduction
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Solution Overview
Problem
Conventional sheet delivery apparatuses produce noise due to projection portions constantly beating the sheet during transport, which affects reliability and efficiency in delivering sheets to a delivery tray.
Innovation Solution
A sheet delivery apparatus with a guide portion that deforms the sheet to prevent contact with projection portions, and a roller system where a projection on one roller abuts the sheet's trailing end to push it towards the delivery tray, ensuring the projection does not beat the sheet during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projection portions are provided to kick out and kick down the sheet trailing end, then sheet delivery reliability is improved, but periodic sound is produced during sheet transport
Solution Approach 1:
A guide portion is introduced as an intermediary element between the sheet and the projection portions. This guide portion deforms the sheet trajectory so that the sheet passes through without contacting the projection portions during transport, thereby eliminating the harmful sound while preserving the projection portions' ability to kick out and kick down the sheet trailing end for reliable delivery
2Reliability
If projection portions constantly beat the sheet during transport, then sheet delivery reliability is improved, but noise production increases
Solution Approach 1:
The invention transforms the continuous periodic beating action into a selective periodic action. The projection portions now only contact the sheet trailing end at specific moments (when needed for kicking out and down), rather than continuously during transport. This is achieved through the guide portion that controls sheet timing and position, reducing noise while maintaining delivery reliability
Data Source
AI summary
Provided is a sheet delivery apparatus for delivering a sheet to a delivery tray, including: a pair of delivery rotary members for nipping and delivering the sheet guided by the guide portion; and a projection that rotates about an axis being the same as an axis of one of the pair of delivery rotary members, is abutted against a trailing end of the sheet, and pushes out the trailing end of the sheet toward a delivery tray side. The guide portion deforms the sheet so that the sheet does not contact the projection, and after the trailing end of the sheet has passed through the guide portion, the projection and the trailing end of the sheet are abutted against each other.