Medium Cassette Locking Mechanism for Positioning Accuracy
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Solution Overview
Problem
In image forming apparatuses, medium guides in the medium cassette can be unintentionally displaced during mounting, leading to positioning inaccuracies of the medium, which affects the feeding and printing processes.
Innovation Solution
A medium feeding apparatus with a locking unit that secures the medium positioning unit when the cassette is inserted, preventing displacement and enhancing positioning accuracy by using a pinion gear mechanism that engages guide racks and a resilient member to maintain the medium guides' position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the medium cassette is detachably mounted to the apparatus main body, then ease of operation is improved, but positioning accuracy deteriorates due to potential displacement of medium guides
Solution Approach 1:
The locking unit is designed to automatically lock the medium positioning unit during the cassette insertion process, before the cassette reaches its final position. This preliminary locking action prevents displacement from occurring in the first place, resolving the contradiction between easy detachable mounting and positioning accuracy
Solution Approach 2:
The locking unit acts as an intermediary mechanism between the cassette mounting operation and the medium positioning system. It mediates the transition by securing the medium guides during insertion, allowing both easy operation and maintained positioning accuracy
2Adaptability or versatility
If the medium guides are made movable for adjustment, then adaptability is improved, but stability deteriorates due to potential unintentional displacement
Solution Approach 1:
The system dynamically switches between two states: during normal operation, the locking unit secures the medium guides for stability; during cassette insertion/removal, the locking unit releases to allow movement. This dynamic control resolves the contradiction between adjustability and stability
Solution Approach 2:
The locking unit applies a counteracting force to prevent unintentional displacement of the medium guides during cassette mounting. By anticipating and counteracting the displacement force before it occurs, the system maintains stability while preserving adjustability capability
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
The locking mechanism ensures precise positioning of the medium, preventing displacement and skew, thereby improving the accuracy and reliability of the medium feeding process.
Implementation Method 1
a resilient member that applies force to the medium guide
Data Source
AI summary
A medium feeding apparatus includes an apparatus main body, and a medium cassette removably inserted into the apparatus main body. The medium cassette is configured to store a medium. The medium cassette includes a medium positioning unit for determining a position of the medium, and a locking unit that locks a movement of the medium positioning unit when the medium cassette is inserted into the apparatus main body and before the medium cassette reaches a predetermined position in the apparatus main body.