Paper Feed Cassette Size Detection Using Overlapping Movable Members
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Solution Overview
Problem
Existing paper feed cassettes in image formation devices face challenges in accurately detecting the size of recording media with complex and cumbersome mechanisms, requiring multiple actuators and separate ranging means for side and end fences.
Innovation Solution
A paper feed cassette with a simple and accurate size detection system using a first and second movable member with overlapping convex portions that vary in size and position synchronously with the sliding motion of the side and end fences, pressing a size detection switch to determine the recording medium's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate ranging means and multiple actuators are used to detect the size of recording medium, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the detection of side fence position and end fence position into a single integrated detection system. The first and second movable members with their convex portions work together with one ranging means to detect both dimensions, eliminating the need for separate ranging means and multiple actuators while maintaining detection accuracy.
Solution Approach 2:
The movable members are designed to perform multiple functions: they simultaneously detect both the side fence position (width) and end fence position (length) of the recording medium. This multi-functional design allows a single detection system to replace what would traditionally require separate detection mechanisms for each dimension.
2Reliability
If multiple actuators and separate ranging means are provided for detecting side and end fence positions, then detection reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges the operation of multiple actuators into a single automated detection process. The first and second movable members automatically move in response to fence movements and trigger a single detection system, eliminating the need for manual operation of multiple actuators and simplifying the user interface.
Solution Approach 2:
The detection system operates automatically through the mechanical coupling between the movable members and the fences. As the fences are adjusted, the movable members follow their movement and automatically trigger the detection of recording medium size, without requiring user intervention or complex control operations.
3Measurement precision
If independent measuring pieces and portions to be measured are used for side and end fences, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the independent measuring pieces into integrated movable members. The first movable member contains both the side measuring piece and end measuring piece, and the second movable member contains corresponding portions. These are detected by a single ranging means through coordinated movement, reducing component count while maintaining precision.
Solution Approach 2:
The measuring pieces and portions to be measured are nested within the movable members structure. The first and second movable members are positioned within the cassette body, with their convex portions and corresponding detection features nested in a compact arrangement that reduces overall device complexity.
Data Source
AI summary
A paper feed cassette capable of detecting the size of the recording medium loaded on the paper feed cassette, and an image formation device comprising this recording medium size detector. Side fences and an end fence are slidably provided to a cassette body detachably installed in the body case, and a first movable member which moves in synchronization with the sliding motion of the side fences, and a second movable member which moves in synchronization with the sliding motion of the end fence are provided to the cassette body in an overlapping state. A plurality of synthesized convex portions are formed by overlapping a plurality of first convex portions formed on the first movable member and a plurality of second convex portions formed on the second movable member, and, by sliding the side fences and the end fence in accordance with the size of the recording medium loaded on the cassette body, the width size and position of the synthesized convex portions change in accordance with the size of the recording medium loaded on the cassette body.