Card Reader Protective Mechanism with Replaceable Rollers
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Solution Overview
Problem
Conventional card readers are prone to damage due to the easy invasion of extraneous materials, such as dust, liquids, or chippings, through their inserting slots, which can lead to the degradation of electronic components and reduced usage life.
Innovation Solution
A card reader with a protective mechanism is designed, featuring an upper and lower shell, a protective mechanism with rollers, springs, and sealing structures, and a circuit board assembly. The protective mechanism includes a front cover, a rear cover, two rollers, two springs, and supporting structures, which work together to prevent extraneous materials from entering and to facilitate easy maintenance by allowing the replacement of rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing elements are made flexible and deformable to enable automatic recovery, then the sealing function is improved, but the sealing elements become difficult to replace after long-term use
Solution Approach 1:
The sealing element is divided into two distinct parts: a flexible sealing body that maintains the sealing function, and a rigid fixing structure that enables easy replacement. The sealing body is segmented from the fixing structure, allowing the sealing body to be replaced independently without replacing the entire assembly.
Solution Approach 2:
The sealing body is extracted as a separate replaceable component from the fixing structure. This allows the sealing body to be removed and replaced independently when worn, while the fixing structure remains in place, solving the replaceability issue while maintaining the sealing function.
2Ease of operation
If the inserting slot is made larger to facilitate card insertion, then the ease of operation is improved, but extraneous materials can easily enter and damage electronic components
Solution Approach 1:
The sealing element acts as an intermediary component between the inserting slot and the electronic components. It allows cards to pass through while blocking extraneous materials like dust and liquids, thus protecting the electronic components without hindering card insertion operations.
Solution Approach 2:
The sealing element uses flexible sealing parts that can deform to accommodate card insertion while maintaining a barrier against extraneous materials. The flexible nature allows it to open for cards but remain closed to block dust and liquids when not in use.
3Ease of operation
If the card passes through a shorter route from the sealing element to the IC card holder, then the ease of operation is improved, but the card and sealing element easily collide with electronic components causing damage
Solution Approach 1:
The sealing element serves as an intermediary that guides the card through a controlled path. It prevents the card from directly colliding with electronic components by channeling it through a protected route, thus maintaining both operational efficiency and component protection.
4Device complexity
If the sealing element is directly disposed on the inner wall of the front shell, then the device complexity is reduced, but the sealing element cannot be easily replaced after deformation
Solution Approach 1:
The sealing element structure is segmented into a sealing body and a fixing structure. The fixing structure is designed with mounting features that allow the sealing body to be independently replaced, maintaining structural simplicity while enabling easy maintenance.
Solution Approach 2:
The sealing body is extracted as a separate serviceable component from the fixing structure mounted on the front shell. This extraction allows the sealing body to be replaced without replacing the entire sealing element assembly, facilitating easy repair while maintaining simple installation structure.
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 card reader with the protective mechanism effectively increases the usage life by preventing the invasion of extraneous materials, reducing friction between the card and rollers, and allowing for convenient replacement of the protective mechanism, thus maintaining the card reader's functionality.
Implementation Method 1
an elastic element disposed in the outlet end, the elastic element elastically abuts between an inner surface of a top of the front cover and one roller along a vertical direction
Implementation Method 2
the two rollers are separated from each other along the vertical direction to form an inserting space between the two rollers... reducing friction between the card and rollers
Data Source
AI summary
A card reader with a protective mechanism includes an upper shell, a lower shell disposed to a bottom surface of the upper shell, a protective mechanism and a circuit board assembly disposed between the upper shell and the lower shell. The protective mechanism includes a front cover, a rear cover covered to a rear of the front cover, two rollers disposed along an up-down direction, two springs, two supporting structures and a plurality of sealing structures. The two springs elastically abut between an inner surface of a top wall of the front cover and one roller along a vertical direction. The two supporting structures are mounted around two opposite sides of the one roller, and two opposite sides of the other roller. The plurality of the sealing structures are disposed at two outer surfaces of the two supporting structures.