Feeding Device Detection Member Restriction Mechanism
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Solution Overview
Problem
The existing feeding devices in image forming apparatuses often experience misdetection when the detection member can move freely to the downstream side in the closed position, leading to incorrect detection of materials stacked on the feeding tray, even when none are present.
Innovation Solution
Incorporating a restriction unit that limits the movement of the detection member to the downstream side in the feeding direction during the closed position of the feeding device body, preventing misdetection by ensuring the detection member remains in a position where it cannot be pressed by the material stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection member can move freely to the downstream side in the closed position, then the detection member can detect material stack in the open position, but misdetection occurs in the closed position
Solution Approach 1:
The detection member is configured to be movable between a detection position (when feeding device body is open) and a restricted position (when feeding device body is closed). This dynamic positioning allows the detection member to adapt its functionality based on the operational state of the feeding device, enabling accurate material stack detection during opening while preventing misdetection during closing.
Solution Approach 2:
A restriction member is introduced as an intermediary element between the detection member and the material stack. This restriction member selectively prevents the detection member from moving to the downstream side when the feeding device body is in the closed position, thereby eliminating the misdetection issue while maintaining detection capability when the device is open.
2Reliability
If the detection member is restricted in the closed position, then misdetection is prevented, but the detection member cannot detect material stack when needed
Solution Approach 1:
The detection member transitions between restricted and free-moving states based on the feeding device body position. When the device body opens, the restriction member retracts, allowing the detection member to move downstream and detect material stacks accurately. When closed, the restriction member engages to prevent misdetection.
Solution Approach 2:
The restriction member is positioned in advance to restrict the detection member's movement before the closing operation completes. This preliminary restriction prevents the detection member from being pressed by the material stack during closing, thereby preventing misdetection before it can occur.
3Device complexity
If the detection member moves freely during closing, then the structure is simple, but misdetection occurs regardless of material presence
Solution Approach 1:
A restriction member is introduced as a simple intermediary component that selectively controls the detection member's movement. This addition maintains relative structural simplicity while effectively preventing misdetection by blocking the detection member's path to the downstream side during the closed position of the feeding device body.
Solution Approach 2:
The restriction member is designed to automatically engage and disengage based on the feeding device body's opening and closing movements. This self-regulating mechanism eliminates the need for complex control systems, maintaining structural simplicity while ensuring reliable operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents misdetection by maintaining the detection member in a position where it cannot be activated by the material stack in the closed position, thus accurately indicating the presence or absence of materials on the feeding tray.
Implementation Method 1
moves to a downstream side in the feeding direction as the detection member is pressed by a downstream end portion of the material to be fed stacked on the stacked portion
Implementation Method 2
a restriction unit that restricts movement of the detection member to the downstream side in the feeding direction in the closed position
Data Source
AI summary
A feeding device includes a feeding device body of which a downstream end portion in a feeding direction, in which a material to be fed is fed, is mounted on a mounting portion, and that is openable and closable between a closed position where an upstream end portion is positioned above the downstream end portion and an open position where the upstream end portion is positioned on a side of the downstream end portion, a stacked portion that is provided on the feeding device body and on which the material to be fed is stacked in the open position, a detection unit that has a detection member hanging down to a downstream end portion of the stacked portion in the open position, moves to a downstream side in the feeding direction as the detection member is pressed by a downstream end portion of the material to be fed stacked on the stacked portion, and detects a stack of the materials to be fed on the stacked portion, and a restriction unit that restricts movement of the detection member to the downstream side in the feeding direction in the closed position.