Movable Pressing Plate Linkage for Scanner Sensor Maintenance
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Solution Overview
Problem
Users face reluctance in performing maintenance works on reading apparatuses due to the need to remove a pressing plate from the document cover, which complicates access for tasks like cleaning the reading sensor.
Innovation Solution
A reading apparatus design featuring a movable pressing plate and linkage assembly that allows the document supporting member to adjust positions, creating clearance for maintenance while maintaining the sensor's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pressing plate is fixed to the document cover, then the structural stability is improved, but the ease of maintenance deteriorates
Solution Approach 1:
The pressing plate is designed to be movable relative to the document cover through a linkage mechanism. When the document supporting member moves between its first and second positions, the pressing plate correspondingly moves between a first position (attached to document cover) and a second position (separated from document cover). This dynamic configuration allows the pressing plate to transition between a stable fixed state during operation and an accessible separated state during maintenance.
2Ease of repair
If the pressing plate is made movable to facilitate maintenance, then the ease of maintenance is improved, but the device complexity increases
Solution Approach 1:
The pressing plate is integrated with the document supporting member through a linkage mechanism, combining their movement functions. When the document supporting member moves between its first and second positions, the pressing plate automatically corresponds to move between its first and second positions. This merging of functions reduces the need for separate control mechanisms and simplifies the overall device structure while maintaining ease of maintenance.
Solution Approach 2:
The pressing plate's movement is automatically driven by the movement of the document supporting member itself, without requiring separate actuators or control systems. The linkage mechanism converts the document supporting member's positional changes into corresponding pressing plate movements, allowing the system to service itself during operation cycles.
3Measurement precision
If the document supporting member is positioned close to the reading sensor, then the reading precision is improved, but the ease of maintenance deteriorates
Solution Approach 1:
The document supporting member is designed to move between a first position (facing the reading sensor across the conveyer path) and a second position (separated farther from the reading surface). When in the first position, it provides optimal reading precision. When in the second position, it creates clearance that facilitates maintenance access to the reading sensor. The pressing plate's coupled movement ensures it does not interfere with maintenance operations when the document supporting member is in the second position.
Data Source
AI summary
A reading apparatus, having a platen glass, a document cover, a conveyer, a reading sensor, a document supporting member, a pressing plate, and a linkage assembly, is provided. The document cover is movable between an open position and a closed position. The document supporting member is movable between a first position, where the document supporting member faces a reading surface of the reading sensor, and a second position, where the document supporting member is separated from the reading surface. The pressing plate is movable between a third position, where the pressing plate is attached to a lower side of the document cover, and a fourth position, where the pressing plate is removed from the lower side. The linkage assembly moves the document supporting member from the first position to the second position in conjunction with the pressing member moving from the third position to the fourth position.