Medium Feeding Apparatus Resistivity Control
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Solution Overview
Problem
The existing medium feeding apparatuses face challenges in minimizing movement resistance due to electric charges accumulated between the electrode and the feeding member, leading to increased frictional forces and sheet-feeding loads.
Innovation Solution
The apparatus incorporates a feeding mechanism with a first and second electrode generating a potential difference, paired with surface layer members and low resistance members having higher and lower volume resistivity respectively, strategically positioned to reduce the attractive force between the feeding member and the adsorptive platen, thereby minimizing movement resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a material having a low frictional coefficient is used for the surface layer member of the electrode and the feeding member, then the movement resistance is reduced, but the sheet-feeding load increases due to accumulated electric charges
Solution Approach 1:
The invention applies different volume resistivity characteristics to different regions of the electrode system. The surface layer member has high volume resistivity (10^8 to 10^16 Ω·cm) to prevent charge accumulation and reduce attractive force, while low resistance members with specific resistivity (10^-6 to 10^6 Ω·cm) are strategically positioned to control charge distribution. This local differentiation of electrical properties resolves the contradiction by preventing harmful charge accumulation without compromising feeding performance
Solution Approach 2:
The electrode system employs a composite structure combining materials with different electrical resistivity characteristics. The surface layer member uses high volume resistivity material to minimize charge accumulation, while low resistance members made of conductive materials are integrated at specific positions. This composite approach allows the system to simultaneously reduce movement resistance through low friction coefficients and control sheet-feeding load by managing electric charge distribution
2Force
If the attractive force between the electrode and feeding member is reduced to lower movement resistance, then the feeding member moves more easily, but the adsorption of the recording medium to the feeding member is compromised
Solution Approach 1:
The invention creates different electrical environments in different regions: the surface layer member maintains high volume resistivity to reduce overall attractive force and movement resistance, while low resistance members are positioned to create localized charge distribution patterns. This allows the system to maintain sufficient adsorption force where needed while reducing harmful friction elsewhere
Solution Approach 2:
The low resistance members act as intermediaries between the high volume resistivity surface layer and the feeding member. They mediate the electric charge distribution, allowing controlled charge transfer that maintains adsorption reliability while preventing excessive charge accumulation that would increase movement resistance
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 configuration effectively decreases the attractive force between the feeding belt and the adsorptive platen, reducing the sheet-feeding load and maintaining the attractive force between the sheet and the feeding belt, resulting in lower movement resistance and improved feeding efficiency.
Implementation Method 1
an adsorbing unit including a first electrode and a second electrode each having a face facing a back face of the feeding member which back face is a face on the opposite side of the medium-placed face, the adsorbing unit being configured to adsorb the recording medium located on the medium-placed face to the medium-placed face by generating a potential difference between the first electrode and the second electrode
Implementation Method 2
a first surface layer member formed of a material having a higher volume resistivity than the first electrode and stacked on one of opposite faces of the first electrode which one is nearer to the back face of the feeding member than the other of the opposite faces thereof
Implementation Method 3
a first low resistance member formed of a material having a lower volume resistivity than the first surface layer member and fixed, at a position between the first surface layer member and the feeding member, to one of faces of the first surface layer member which one faces the back face of the feeding member
Data Source
AI summary
A medium feeding apparatus including: a feeding mechanism including a feeding member and configured to feed the recording medium; an adsorbing unit including first and second electrodes facing the feeding member and configured to adsorb the recording medium to the feeding member; first and second surface layer members respectively having higher volume resistivities than the first and second electrodes and respectively stacked on the first and second electrodes; and first and second low resistance members respectively having lower volume resistivities than the first and second surface layer members and respectively fixed to the first and second surface layer members at positions between the respective first and second surface layer members and the feeding member, wherein the first low resistance member and the second low resistance member are distant from each other.