Cold-Pressure Toner Pinning for Xerographic Media Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current xerographic printing systems face inefficiencies and high energy consumption due to the need for high-temperature heat fusing, which also results in maintenance costs and image quality issues like smearing and gloss, particularly with conventional cold-pressure fixing systems.
Innovation Solution
The use of low-pressure cold-pressure fixing rolls that partially pin unfused toner to the substrate media, allowing for more robust handling and reducing the need for high-energy heat fusing devices, with the option to include heat fusing devices for final toner fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional cold-pressure fixing systems are used to fix toner at low temperatures, then energy consumption is reduced, but significant smearing or unintentional gloss is added, negatively affecting image resolution or quality
Solution Approach 1:
The patent segments the toner fixation process into two distinct stages: (1) cold-pressure fixing at low temperature to prevent smearing and maintain image quality, and (2) subsequent heat fusing to achieve permanent bonding. This segmentation allows each stage to optimize for its specific function, resolving the contradiction between low energy consumption and image quality.
Solution Approach 2:
The cold-pressure fixing is performed as a preliminary action before heat fusing. By applying pressure to partially set the toner image first, the system prevents smearing during media handling while leaving the toner sufficiently unfused to be permanently bonded later. This preliminary action enables low-energy processing without compromising final image quality.
2Reliability
If high-temperature heat fusing is used to permanently bind toner to substrate media, then toner binding is achieved, but energy consumption and maintenance costs increase
Solution Approach 1:
The patent divides the toner binding process into two stages: initial cold-pressure fixing to prevent smearing, followed by brief heat fusing for permanent bonding. This segmentation reduces the total energy required compared to conventional single-stage high-temperature fusing, while maintaining reliable toner binding.
Solution Approach 2:
Cold-pressure fixing is performed as a preliminary step before heat fusing. This preliminary pressure application partially sets the toner, reducing the subsequent heat fusing time and energy requirements while ensuring reliable permanent bonding.
3Reliability
If multiple heated fusers are used in parallel processing assemblies, then image handling reliability is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent segments the fusing function across multiple processing stations, where each station performs cold-pressure fixing followed by shared heat fusing. This allows parallel processing of multiple media while reducing the total number of heated fusers needed, as the heat fusing resources can be shared across stations.
Solution Approach 2:
The heat fusing devices are designed to serve multiple marking engines or processing stations universally. A single heat fusing unit can process media from multiple cold-pressure fixing stations, reducing the total number of heated fusers required while maintaining image handling reliability across all processing channels.
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 approach reduces energy consumption, maintenance costs, and image quality issues by enabling more flexible media handling and minimizing the number of high-energy fusing devices, while maintaining image quality through partial toner fixation before final heat fusion.
Implementation Method 1
cold-pressure fixing generally consists of squeezing a substrate sheet carrying toner between two solid rolls
Implementation Method 2
heat at least partially melts the toner and the pressure helps force it to bind with the paper
Implementation Method 3
applying pressures between 10 and 200 psi, cooperate to form a fusing nip through which the paper carrying toner passes
Data Source
AI summary
An apparatus for and method of handling substrate media in a marking device using toner. The apparatus including first and second rolls for handling the substrate media. The first roll applying pressure to the toner. After the application of pressure by the first roll, the toner remains partially unfused to the substrate media. The second roll subsequently engaging the pressed toner as the substrate media passes the second roll. The first roll and the second roll being disposed remotely from one another in a process handling direction of the substrate media. The method including the application of pressure to the unfused toner on the substrate media by a first roll. The method subsequently engages the pressed toner with a second roll for handling the substrate media.