Grinding Roller Abrasive Aggregates for Clogging and Glossiness
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Solution Overview
Problem
The existing grinding rollers used in fixing devices for image forming apparatuses face challenges in reducing grinding time while maintaining image glossiness, as increasing abrasive grain size improves grinding performance but reduces glossiness, and existing solutions degrade quickly due to clogging.
Innovation Solution
A grinding roller with an abrasive grain layer featuring irregularities formed by aggregates of abrasive grains, which enhances grinding performance by allowing larger projections and recesses, reducing clogging, and maintaining high glossiness by optimizing the abrasive grain ratio and surface structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the particle size of the abrasive grains is increased to improve grinding performance and reduce grinding time, then the glossiness of the ground surface and fixed toner image is reduced
Solution Approach 1:
The invention creates local quality differentiation by forming aggregates of abrasive grains that generate projections and recesses on the grinding surface. The projections (formed by aggregated abrasive grains) provide aggressive cutting action for high productivity, while the recesses between projections trap debris and maintain a cleaner grinding interface that preserves surface glossiness. This local differentiation allows different regions of the grinding surface to perform different functions simultaneously.
Solution Approach 2:
The invention transitions from considering only the particle size dimension to incorporating surface topography dimension. By forming three-dimensional aggregates of abrasive grains that create projections and recesses, the solution adds a vertical dimension to the traditionally two-dimensional grinding surface. This dimensional change allows the surface to simultaneously achieve high material removal rate (through projection height) and high surface quality (through recess depth and distribution).
2Duration of action of stationary object
If the grinding roller is used repeatedly, then clogging occurs on the grinding surface which degrades grinding performance
Solution Approach 1:
The invention effectively creates a porous structure on the grinding surface through the formation of recesses between abrasive grain aggregates. These recesses act as pores that can accommodate and store grinding debris, preventing the clogging that would otherwise occur on a flat grinding surface. The porous topology allows the grinding roller to maintain its grinding performance over extended periods of repeated use.
Solution Approach 2:
The recesses formed by the aggregate structure continuously discard grinding debris from the active grinding interface. By providing dedicated storage spaces (recesses) for waste material, the system prevents debris accumulation that would degrade performance. This automatic discarding mechanism operates throughout the service life of the grinding roller, maintaining consistent productivity.
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 grinding roller achieves high grinding performance over repeated use with minimal reduction in image glossiness, allowing for shorter grinding times and extended durability by suppressing clogging and maintaining surface quality.
Implementation Method 1
a grinding roller that grinds a surface of a toner image-side rotary member
Data Source
AI summary
There is provided a grinding roller for use in a fixing device including a pair of rotary fixing members that rotate while being pressed against each other to form an area of contact, and heat and press a recording medium carrying an unfixed toner image and fed to the area of contact, to thereby fix the unfixed toner image on the recording medium. The grinding roller is configured to grind a surface of a toner image-side rotary member of the pair of rotary fixing members that comes into contact with the unfixed toner image. The grinding roller includes an abrasive grain layer including abrasive grains, forming a surface layer of the grinding roller, and having a surface with irregularities including projections each formed by an aggregate of some of the abrasive grains and larger in size than each of the abrasive grains and recesses formed between the projections.