Feeding Roller Dynamics for Single-Sheet Print Media Separation
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Solution Overview
Problem
Conventional printing apparatuses face issues with double-feeding when feeding print media from a stacked cassette, as the gap between the feeding and separation rollers can allow multiple sheets to pass through, leading to incorrect feeding and printing errors.
Innovation Solution
A print media feeding apparatus with a feeding roller that moves to an abutting position to feed the top sheet and then to a separated position, utilizing a return unit to ensure only one sheet is fed, and a separation member to prevent multiple sheets from being fed downstream by applying a braking torque to the feeding roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is formed between the feeding roller and the separation roller, then the separation mechanism can function, but multiple sheets of print media may pass through the gap causing double-feeding
Solution Approach 1:
The feeding roller is made movable between an abutting position (where it contacts the print media) and a separated position (where it is separated from the print media). This dynamic positioning allows the feeding roller to move to the separated position after feeding, preventing subsequent sheets from being fed through the gap, thereby eliminating double-feeding while maintaining separation mechanism functionality
Solution Approach 2:
The return unit performs a return operation to return the feeding roller to the abutting position after the feeding operation is complete. This preliminary repositioning ensures that the feeding roller is ready for the next single-sheet feeding operation and prevents accidental double-feeding by controlling the timing and position of the feeding roller
2Productivity
If the pickup roller abuts the print media with impact, then the top sheet can be fed, but a gap is formed between the feeding roller and separation roller
Solution Approach 1:
The feeding roller dynamically transitions between abutting and separated positions. After the impact feeding action, the roller automatically moves to the separated position, maintaining the gap necessary for separation while preventing subsequent sheets from being accidentally fed through, thus resolving the reliability issue caused by gap formation
Data Source
AI summary
A print media feeding apparatus includes a stacking part configured to stack print media; a feeding roller which is movable to an abutting position at which the feeding roller contacts the print media stacked on the stacking part and to a separated position separated from the print media stacked on the stacking part and configured to feed a print medium by rotating at the abutting position; a separation member configured to separate the print media; and a return unit configured to perform a return operation of returning the print medium other than a top print medium which the feeding roller abuts. The feeding roller moves to the separated position after feeding the print medium from the stacking part. The return unit performs the return operation upon the feeding roller moving to the separated position. After the return operation, the feeding roller stops at the abutting position.