Feed Device Pull-Back Mechanism for Tray Jamming
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Solution Overview
Problem
Paper feed failure occurs when removing and reinstalling paper feed trays in image processing devices due to the protruding cut tips of the medium contacting housing components, leading to bending and jamming.
Innovation Solution
A feed device with a pull-back mechanism that rerolls and repositions the unrolled medium orthogonal to its rotation axis, preventing contact with the housing during tray installation and removal, thus minimizing the risk of bending and jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the feed tray is made removable for easy maintenance and operation, then ease of operation is improved, but paper feed failure occurs due to medium contact with housing components
Solution Approach 1:
The pull-back mechanism performs preliminary action by automatically retracting the medium tip into the feed tray during the tray removal process. This preliminary retraction prevents the medium from contacting housing components when the tray is removed or reinstalled, thereby eliminating paper feed failures while maintaining easy tray operation.
2Ease of operation
If the medium is left unrolled during tray removal, then ease of operation is improved, but the medium tip contacts housing components causing bending and jamming
Solution Approach 1:
The pull-back mechanism applies preliminary anti-action by retracting the medium tip into the feed tray before the tray is fully removed. This counteracts the potential harmful effect of medium contact with housing components, preventing bending and jamming while allowing easy tray removal.
3Reliability
If a pull-back mechanism is added to prevent medium contact, then paper feed reliability is improved, but device complexity increases
Solution Approach 1:
The pull-back mechanism is designed to be driven automatically by the tray's own movement. When the tray is pulled out, the mechanism self-activates to retract the medium without requiring external control systems or additional power sources, thereby improving reliability while minimizing the increase in device complexity.
Data Source
AI summary
A feed device includes: a feed tray configured to accommodate a roll, in which a medium is rolled in a roll shape, rotatably; a housing configured to support the feed tray installable; and a pull-back mechanism configured to pull back the medium unrolled from the roll in a direction orthogonal to a rotation axis of the roll in conjunction with an outward movement of the feed tray from the housing in the direction orthogonal to the rotation axis of the roll.