Dual Vacuum Ports for Imaging Drum Particle Removal
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Solution Overview
Problem
Existing vacuum cleaning methods in image forming devices, such as printers, are inadequate in effectively removing contaminating particles from the imaging drum and air boundary layer, leading to print quality defects and printhead failures.
Innovation Solution
The implementation of a dual-site particle abatement system with first and second particle removal devices, each comprising a vacuum port or slot positioned strategically relative to the image transfer site and marking material dispensers, respectively, to create distinct air flows that dislodge and capture contaminants, thereby reducing contamination flux to the print head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single vacuum cleaning device is used to remove particles from the imaging drum, then the device complexity is low, but the particle removal effectiveness is insufficient leading to contamination of the print head
Solution Approach 1:
The particle removal system is divided into two separate vacuum cleaning devices: a first particle removal device positioned near the image transfer site and a second particle removal device positioned near the marking material dispensers. Each device independently targets specific contamination zones, creating segmented protection against particles that would otherwise reach the printhead. This segmentation allows each device to be optimized for its specific location while collectively providing comprehensive particle removal coverage.
2Reliability
If vacuum ports are positioned close to the image transfer site and marking material dispensers, then particle removal effectiveness increases, but the device complexity and positioning precision requirements increase
Solution Approach 1:
Each vacuum port is positioned at a specific location optimized for its function: the first vacuum port is located close to the image transfer site to capture particles generated during media feeding, while the second vacuum port is positioned near the marking material dispensers to protect the printhead. This local optimization of positioning creates targeted particle removal zones without requiring complex positioning systems, as each port's location is specifically adapted to its local contamination source.
3Manufacturing precision
If existing vacuum cleaning methods are used, then the device complexity remains low, but print quality deteriorates due to stray paper dust particles
Solution Approach 1:
The first particle removal device performs preliminary cleaning by removing particles from the imaging drum surface in the region of the image transfer site before particles can be entrained in the air boundary layer and transported to the printhead. This preliminary action at the source of contamination prevents particles from reaching critical areas, thereby maintaining print quality without requiring complex additional filtration or cleaning mechanisms downstream.
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 significantly reduces ink jet failures and enhances printer reliability by effectively removing contaminants from the imaging drum and air boundary layer, improving print quality and extending the mean number of copies between interventions.
Implementation Method 1
The first particle removal device includes a first vacuum port positioned such that the imaging drum rotates a first angle from the image transfer site to the first vacuum port
Data Source
AI summary
An image forming device includes marking material dispensers for disposing an image on an imaging drum surface. The image forming device further includes plural particle removal devices comprising first and second particle removal devices coupled to a vacuum source. The first particle removal device includes a first vacuum port positioned as close as possible to an included image transfer site. The second particle removal device includes a second vacuum port positioned as close as possible to the marking material dispensers. The first and second vacuum ports are positioned proximate to the imaging drum surface to provide respective first and second air flows.