Separation Roller Torque Limiter and Gear System for Media Conveying
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Solution Overview
Problem
Existing medium conveying apparatuses face challenges in efficiently conveying and separating various thicknesses of media, such as papers and passports, due to fluctuations in frictional forces and manufacturing errors, leading to issues like multi-feed and instability in conveying thick or rigid documents.
Innovation Solution
The medium conveying apparatus incorporates a torque limiter on the separation roller, a two-stage gear system, and a support mechanism that allows the separation roller to be pressed toward the feed roller, enabling precise separation and feeding by controlling the torque and force applied, thereby stabilizing the conveying process for diverse media thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed pressing force is applied to the separation roller, then the separation function is maintained, but the conveying stability for thick or rigid documents deteriorates due to friction force fluctuations
Solution Approach 1:
The support member is made swingable about a rotation axis, allowing the separation roller to dynamically adjust its position and pressing force based on the medium being conveyed. This dynamic configuration enables the system to adapt to different media thicknesses while maintaining conveying stability, resolving the contradiction between fixed pressing force requirements and variable medium handling needs.
2Reliability
If the separation roller pressing force is increased to prevent multi-feed, then the separation reliability improves, but the risk of damaging thick or rigid documents increases
Solution Approach 1:
The system changes the pressing force parameter dynamically based on the detected medium type. For thin media, higher pressing force ensures reliable separation, while for thick or rigid documents, the pressing force is reduced to prevent damage. This parameter adjustment resolves the contradiction between separation reliability and document safety.
3Device complexity
If a simple gear transmission is used for the separation roller, then the device complexity is reduced, but the precision of separation force control deteriorates
Solution Approach 1:
A two-stage gear transmission with an intermediate gear is introduced between the motor and the separation roller. This intermediate gear mechanism serves as a mediator that enables precise control of the separation force by allowing for appropriate gear ratio selection, while the overall structure remains relatively simple. This resolves the contradiction between device complexity and force control precision.
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 ensures precise separation and feeding of media, preventing multi-feed and effectively handling both thin and thick documents, while maintaining stability and reducing the impact of manufacturing errors on the conveying process.
Implementation Method 1
a torque limiter provided on a rotation axis of the separation roller... a force generated by the torque limiter limiting a torque with which the separation roller attempts to rotate
Implementation Method 2
a motor to generate a driving force for rotating the separation roller... The first gear rotates in a direction for generating a force for separating the separation roller from the feed roller by rotation of the motor
Implementation Method 3
a third gear provided between the first gear and the second gear... The third gear is a two-stage gear
Implementation Method 4
The separation roller is pressed toward the feed roller side by a force generated by the torque limiter... the unit is supported swingably with an axis of the first gear as a rotation axis
Data Source
AI summary
A medium conveying apparatus includes a torque limiter provided on a rotation axis of the separation roller, a unit including a first gear, a second gear provided on the rotation axis, and a third gear provided between the first gear and the second gear. The separation roller is pressed toward a feed roller side by a force generated by the torque limiter. The first gear rotates in a direction for generating a force for separating the separation roller from the feed roller. The third gear is a two-stage gear. The number of teeth of a gear on the second gear side of the third gear is more than the number of teeth of a gear on the first gear side of the third gear.