Medium Conveyance Shaft Grounding With a Separate Contact Member
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Solution Overview
Problem
Existing medium conveyance devices face design restrictions due to the need for grounding metal rotating shafts via conductive bearings and metal elastic materials, which can lead to increased size, weight, and potential static electricity issues.
Innovation Solution
A medium conveyance device with a conductive rotating shaft grounded via a conductive contact section and grounding member, allowing for stable grounding without the need for direct contact with the bearing, reducing design restrictions and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal rotating shaft is grounded via a conductive bearing and metal elastic material, then grounding is achieved, but design restrictions increase and device size increases
Solution Approach 1:
The patent extracts the grounding function from the bearing structure and separates it into an independent grounding member. The bearing no longer needs to be conductive or elastic, as the grounding function is performed by a dedicated grounding member that contacts the rotating shaft separately. This separation eliminates the design restrictions imposed by requiring the bearing to serve dual purposes.
Solution Approach 2:
The grounding system is segmented into distinct functional components: the bearing handles only the rotational support function, while the grounding member handles only the electrical grounding function. This segmentation allows each component to be optimized independently, reducing overall design complexity and enabling easier replacement of individual parts.
2Reliability
If the metal rotating shaft is grounded via conductive bearing and metal elastic material, then grounding is achieved, but device weight increases
Solution Approach 1:
By extracting the grounding function from the bearing structure, the patent eliminates the need for heavy metal elastic materials and conductive bearing components. The grounding member can be a simpler, lighter structure that only performs the grounding function, reducing the overall weight of the device while maintaining grounding stability.
3Reliability
If the metal rotating shaft is grounded via conductive bearing and metal elastic material, then grounding is achieved, but static electricity issues occur
Solution Approach 1:
The patent separates the grounding function from the bearing, allowing the use of non-conductive bearing materials that do not generate static electricity through friction. The dedicated grounding member provides a reliable grounding path without the static electricity generation issues associated with metal-on-metal contact in the bearing.
4Reliability
If the metal rotating shaft is grounded via conductive bearing and metal elastic material, then grounding is achieved, but replacement of rotating parts becomes difficult
Solution Approach 1:
By segmenting the grounding function into a separate grounding member, the patent enables independent replacement of the rotating shaft and bearing assembly without affecting the grounding system. The grounding member can remain in place while the rotating parts are replaced, or the grounding member can be quickly detached and reattached, significantly improving ease of repair and maintenance.
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 solution stabilizes grounding while minimizing device size and weight, enabling easy replacement of rotating parts and reducing static electricity, thus enhancing operational efficiency and design flexibility.
Implementation Method 1
a conductive contact section provided between the rotating body and the bearing in an axial direction of the rotating shaft and capable of coming into contact with the rotating shaft
Implementation Method 2
a grounding member configured to ground the contact section
Data Source
AI summary
A medium conveyance device includes a rotating body configured to rotate in contact with a medium, a conductive rotating shaft to which the rotating body is attached, the conductive rotating shaft rotating the rotating body, a bearing configured to rotatably hold the rotating shaft, a conductive contact section provided between the rotating body and the bearing in an axial direction of the rotating shaft and capable of coming into contact with the rotating shaft, and a grounding member configured to ground the contact section.