Document Conveying Device With Lifting Wall for Added Capacity
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Solution Overview
Problem
Increasing the capacity of a document conveying device's sheet feeding tray without enlarging its size in the upper-and-lower direction is challenging, as enlarging the wall part to accommodate more documents also increases the device's overall size.
Innovation Solution
A document conveying device with a sheet feeding tray, a lifting mechanism, a fixed wall part, and a lifting wall part that slides along the fixed wall part, allowing the tray to expand its capacity by lifting the wall part without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the wall part size is increased to accommodate more documents, then the sheet feeding tray capacity is improved, but the device size in the upper-and-lower direction increases
Solution Approach 1:
The wall part is designed as a movable component that can shift position between a first position (when sheet feeding tray capacity is not fully utilized) and a second position (when capacity is fully utilized). This dynamic adjustment allows the wall part to extend in the sheet feeding direction to increase capacity when needed, while retracting to maintain compact device dimensions when capacity is insufficient, thus resolving the contradiction between maximizing document capacity and minimizing device size.
2Quantity of substance
If the wall part size is increased to accommodate more documents, then the sheet feeding tray capacity is improved, but the document conveying function may be obstructed
Solution Approach 1:
The movable wall part can dynamically adjust its position to balance capacity and conveying function. When the wall part is in the first position, it maintains a compact configuration that ensures smooth document conveying. When documents need to be conveyed, the wall part can shift to the second position to maximize capacity, while the lifting mechanism ensures the tray moves smoothly without obstruction, thus maintaining conveying reliability while increasing capacity.
Solution Approach 2:
The wall part is designed to be movable before documents are fully loaded, allowing the system to pre-adjust the wall position based on the number of documents present. This preliminary adjustment ensures that the wall part is in the optimal position to either maximize capacity or ensure smooth conveying, preventing obstruction before it occurs and maintaining reliable document conveying function.
Data Source
AI summary
A document conveying device includes a sheet feeding tray, a sheet feeding mechanism, a sheet feeding tray lifting mechanism, a top plate, a fixed wall part, and a lifting wall part. The top plate is in contact with a lower surface of the document to be fed. The fixed wall part is provided extending downward from an upstream side end portion of the top plate, and fixed in position. The lifting wall part is provided extending upward from a downstream side end portion of the sheet feeding tray, and is lifted and lowered along the fixed wall part together with the sheet feeding tray. The lifting wall part has a slit along an upper-and-lower direction. The fixed wall part has a fin along the upper-and-lower direction. An upper end portion of the slit is opened in the upper-and-lower direction. The fin is arranged inside the slit.