Sheet Feeding Roller Intermediate Positioning Mechanism
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Solution Overview
Problem
The existing sheet feeding apparatus experiences unstable abutting pressure of the delivery roller against the sheet, leading to positional displacement and potential sheet feeding failures when the roller moves to the feeding position.
Innovation Solution
A sheet feeding apparatus with a moving mechanism that positions the feeding roller to a second retracting position between the feeding and first retracting positions, allowing for stable sheet handling and preventing interference during sheet stacking, and includes a biasing spring to facilitate movement between these positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the delivery roller moves directly from the retracting position to the feeding position while being driven, then the sheet feeding speed is improved, but the abutting pressure becomes unstable causing sheet displacement
Solution Approach 1:
The delivery roller is moved to an intermediate position (second retracting position) before the feeding position is reached. This preliminary positioning action allows the roller to approach the sheet without immediately applying full driving force, enabling stable abutting pressure to be established before sheet feeding begins, thus preventing sheet displacement while maintaining efficient feeding speed
2Productivity
If the delivery roller abuts against the sheet during movement to the feeding position, then the sheet is fed simultaneously, but the abutting pressure is unstable leading to feeding failures
Solution Approach 1:
The roller is positioned at an intermediate second retracting position before making contact with the sheet. This preliminary positioning ensures that when the roller eventually abuts against the sheet to begin feeding, the abutting pressure is stable and controlled, preventing sheet displacement and feeding failures while maintaining efficient operation
Solution Approach 2:
The moving mechanism dynamically positions the delivery roller at different stages: first retracting position (fully retracted), second retracting position (intermediate position before feeding), and feeding position (contact position). This dynamic positioning allows the system to optimize both reliability during approach and efficiency during feeding by adjusting the roller's position and driving force accordingly
Data Source
AI summary
There is provided a sheet feeding apparatus for feeding a sheet. The sheet feeding apparatus includes: a feeding roller that feeds a sheet; and a moving mechanism that moves the feeding roller to a feeding position where the feeding roller contacts the sheet, to a first retracting position where the feeding roller is separated from the sheet, and to a second retracting position lying between the feeding position and the first retracting position.