Sheet Feed Tray Detection Evacuation Mechanism
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Solution Overview
Problem
The existing sheet feed devices face issues when accommodating thicker papers or papers with different densities, as the increased height of the sheet feed tray causes the sheet detection wheel and upper limit detection wheel to contact with the tray, leading to potential damage during insertion and removal.
Innovation Solution
Incorporating an evacuator mechanism that moves the sheet detection member and upper limit detection member to an evacuation position, preventing them from interfering with the sheet feed tray's height adjustment, ensuring reliable operation and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sheet feed tray height is increased to accommodate thicker papers or papers with different densities, then the adaptability to various paper types is improved, but the sheet detection wheel and upper limit detection wheel contact with the tray during insertion and removal, causing potential damage
Solution Approach 1:
The sheet detection member and upper limit detection member are designed to be movable rather than fixed. The evacuator mechanism dynamically adjusts their positions between a detection position (for normal operation) and an evacuation position (during tray insertion/removal), allowing the tray height to be increased for accommodating thicker papers without compromising the durability of the detection wheels
Solution Approach 2:
The evacuator acts as an intermediary mechanism that mediates between the tray height requirement and the detection wheel protection requirement. It automatically activates during tray insertion and removal to evacuate the detection members, preventing contact damage while allowing the tray to be designed for higher paper capacity
2Quantity of substance
If the sheet feed tray height is increased to accommodate thicker papers, then the quantity of papers that can be stored is improved, but the detection wheels interfere with the tray movement during insertion and removal
Solution Approach 1:
The detection members are designed with dynamic positioning capability through the evacuator mechanism. During tray insertion and removal operations, the evacuator automatically moves the detection members to an evacuation position that clears the tray path, ensuring smooth operation. During normal printing operations, the members return to their detection positions to perform their monitoring functions
Solution Approach 2:
The evacuator mechanism performs preliminary action by proactively moving the detection members to the evacuation position before the tray makes contact during insertion or removal. This preventive approach eliminates potential interference and ensures smooth tray operation throughout the entire insertion/removal process
Data Source
AI summary
A sheet feed device includes a removal sheet feed tray, a bottom plate provided in the sheet feed tray, and can be lifted up together with one or more papers stacked thereon so as to make an uppermost paper positioned at an upper limit position, a sheet feeder that feeds out the papers stacked on the bottom plate sequentially from the sheet feed tray, a sheet detection member that detects whether or not at least one paper is stacked on the sheet feed tray, an upper limit detection member that detects whether or not the uppermost paper is positioned at the upper limit position, and an evacuator that evacuates the sheet detection member and the upper limit detection member to an evacuation position where the sheet detection member and the upper limit detection member never interfere a removal and an installation of the sheet feed tray.