Image Forming Apparatus Airflow Management for Charging Wire Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses, ion winds generated by charging wires can become contaminated with foreign materials from the photosensitive drum, leading to degraded charging performance due to backflow of ions.
Innovation Solution
The apparatus incorporates a pair of frames with specific openings to manage airflow, preventing backflow by directing air to suck in outside air and discharge it between the frames, thereby maintaining the cleanliness of the charging wire and enhancing charging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion wind flows from the charging wire to the photosensitive drum, then charging performance is improved, but foreign material attaches to the charging wire and degrades charging performance
Solution Approach 1:
The patent applies pneumatic principles by introducing a controlled airflow system using a blower to generate air current that flows from the photosensitive drum side toward the charging wire. This pneumatic flow prevents foreign material accumulation on the charging wire while maintaining effective ion wind charging, thus resolving the contradiction between charging performance and foreign material attachment
Solution Approach 2:
The patent extracts and separates the air flow control function from the charging system by introducing an independent blower device. This external air supply system is positioned to create a unidirectional flow that protects the charging wire from foreign material while not interfering with the ion wind generation, effectively taking out the contamination problem from the charging process
2Device complexity
If the charger structure is simplified, then device complexity is reduced, but ability to prevent foreign material attachment is weakened
Solution Approach 1:
The patent makes the air flow system serve multiple functions: it prevents foreign material attachment to the charging wire, maintains ion wind effectiveness, and creates a clean environment for charging. By positioning the blower and air flow path to achieve these multiple objectives simultaneously, the system prevents foreign material attachment without requiring complex additional structures
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 airflow management system effectively prevents foreign materials from attaching to the charging wire, maintaining the charging performance and reducing contamination, ensuring consistent image formation.
Implementation Method 1
a blower configured to generate air flow
Implementation Method 2
ions are generated around the charging wire, and the ions move in the form of an ion wind toward the photosensitive drum
Data Source
AI summary
An image forming apparatus includes a plurality of process cartridges and a pair of frames. Each of the plurality of process cartridges includes a photosensitive drum, a charger and a charger supporting wall. One of the pair of frames has a plurality of first openings such that air outside the pair of frames is sucked between the pair of frames through the first openings. The other of the pair of frames has a plurality of second openings such that air between the pair of frames is discharged outside the pair of frames through the second openings. The first openings are positioned on an opposite side of the charger supporting wall from the photosensitive drum. The second openings are positioned on the same side of the charger supporting wall as the photosensitive drum.