Bidirectional Detection Lever for Medium Feeding Devices
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Solution Overview
Problem
Conventional medium feeding devices and image forming apparatuses suffer from damage to media when the tray is pulled out due to the inability of detection levers to rotate in the reverse direction, leading to incorrect detection of sheet loading status.
Innovation Solution
A medium feeding device with a detection lever that can move between a non-load detection position and a load detection position, and further retreats when pressed, allowing it to avoid damage and accurately sense sheet loading, featuring a separate sense target part that synchronizes with the lever only between these positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detection lever is designed to rotate only in the forward direction to detect sheet loading, then the detection function is simplified, but the media get damaged when the tray is pulled out because the lever cannot rotate in reverse
Solution Approach 1:
The detection lever is designed with dynamic rotation capability in both forward and reverse directions. The lever can rotate forward when media are loaded to trigger detection, and rotate backward when the tray is pulled out to avoid media damage. This dynamic bidirectional rotation resolves the contradiction between simplified detection mechanism and prevention of media damage.
2Measurement precision
If the detection lever rotates forward to detect loaded sheets, then sheet loading detection is achieved, but incorrect detection occurs when sheets are not properly loaded due to inability to rotate in reverse
Solution Approach 1:
The detection lever incorporates bidirectional rotation capability allowing it to rotate forward when sheets are properly loaded for accurate detection, and rotate backward when sheets are not properly loaded or when tray is pulled out. This prevents incorrect detection and ensures reliable detection accuracy under various loading conditions.
Solution Approach 2:
The detection lever provides feedback about the actual loading state through its rotational position. By rotating backward when trays are pulled out or when sheets are not properly loaded, the lever gives accurate feedback to the control unit, preventing incorrect detection and ensuring reliable operation.
3Ease of manufacture
If the detection lever is fixed in position to simplify the structure, then manufacturing is easier, but it cannot accurately detect sheet loading status when tray position changes
Solution Approach 1:
The detection lever transitions from a fixed structure to a dynamic rotating structure that can move forward and backward. This allows the lever to maintain accurate detection of sheet loading status while adapting to tray position changes, balancing ease of manufacture with detection precision.
Data Source
AI summary
A medium feeding device includes a device body, a tray that regulates and contains a plurality of kinds of media of different sizes in a loading area according to the sizes of the media, and a detection lever that detects whether or not the media are properly loaded in the tray. In a state in which the tray is contained in the device body, when the media are not properly loaded in the tray, the detection lever moves to a non-load detection position. When the media are properly loaded in the tray, the detection lever moves to a load detection position with a front end part being oriented toward the tray containing side, and when a pressing force is applied to the detection lever at the non-load detection position from the tray containing side, the detection lever retreats toward the tray pulling out side.