Developing Device Gap Forming Member Airflow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses, air entering the developing device due to the rotation of the developing roller increases pressure, causing toner to escape and potentially contaminating functional components.
Innovation Solution
A developing device with a housing, a developing roller, a gap forming member, and a blocking member is designed to manage airflow, forming specific gaps and openings to prevent toner from escaping, using magnetic forces to carry toner and a blocking member to control airflow and retain toner clouds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the developing roller rotates to carry toner, then the developing function is improved, but air enters the developing device and pressure increases causing toner to escape and contaminate functional components
Solution Approach 1:
A blocking member is introduced as an intermediary element positioned between the developing device and the external environment. This blocking member intercepts and redirects the airflow carrying toner particles, preventing direct escape of toner to contaminate functional components while allowing the developing roller to continue its rotation for normal developing operation.
Solution Approach 2:
The airflow parameters (direction and velocity) are changed by the blocking member's presence. The blocking member modifies the airflow path, redirecting it away from functional components. This parameter change allows the system to maintain the necessary pressure differential for developing while preventing toner escape, resolving the contradiction between developing function and toner contamination.
2Object-generated harmful factors
If a blocking member is added to prevent toner escape, then toner scattering is reduced, but device complexity increases
Solution Approach 1:
The blocking member is designed as a thin, flexible plate-like structure rather than a bulky rigid component. This thin-film approach provides effective airflow blocking and toner particle interception while occupying minimal space and adding minimal structural complexity to the overall device. The simple geometric shape of the blocking member allows for easy integration into the existing developing device architecture.
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 suppresses toner scattering outside the developing device, reducing contamination of functional components and eliminating the need for additional components like filters, thus improving maintainability and apparatus size.
Implementation Method 1
a magnetic pole structure disposed within the hollow interior portion of the roller, at least a portion of the magnetic pole structure facing the opening in the wall of the housing, wherein the developing roller is configured to carry a developer on an outer surface thereof using magnetic force of the magnetic pole structure
Data Source
AI summary
A developing device includes a housing having an opening in a wall, a developing roller having a hollow interior portion, a magnetic pole structure disposed within the hollow interior portion of the roller, a gap forming member, and a blocking member. The gap forming member is located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forms a first gap with respect to the developing roller and forms a second gap with respect to the housing. The gap forming member has a first side facing the opening in the wall of the housing and a second side spaced inwardly of the housing, from the first wall. The blocking member is located in the first gap and at one of the first and second sides of the gap forming member.