Developing Device Boundary Area Regulating Toner Supply
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Solution Overview
Problem
Conventional developing devices face fluctuations in the toner to developer (TC) ratio, leading to inefficiencies in toner supply and image quality, particularly due to the design where carriers move from the developer tank to the toner tank, causing a rise in the TC ratio and affecting continuous high-density image formation.
Innovation Solution
A developing device with a main body containing a first space for the developer and a toner tank with a second space, where the boundary area between the spaces is closed by toner or developer, regulating the toner supply and maintaining an optimal TC ratio through controlled pressure and flow, preventing carrier leakage and ensuring consistent toner image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the developer tank and toner tank are connected via toner supply path and detour, then the toner concentration can be adjusted quickly, but the TC ratio fluctuates because carriers move to the toner tank
Solution Approach 1:
The patent divides the developer tank into a first space for developer and a second space for toner, separated by a partition wall. This segmentation prevents carriers from moving between tanks while allowing independent control of each space, resolving the TC ratio fluctuation issue while maintaining quick toner supply capability.
Solution Approach 2:
The partition wall acts as an intermediary barrier between the developer tank and toner tank, preventing direct mixing of carriers and toner. This mediator structure allows the system to maintain stable TC ratio by blocking carrier migration while still enabling controlled toner transfer through the boundary area.
2Productivity
If carriers move from developer tank to toner tank, then toner can be supplied quickly, but the TC ratio increases and image quality deteriorates
Solution Approach 1:
By segmenting the developer tank into first and second spaces separated by a partition wall, the patent enables quick toner supply without allowing carriers to migrate to the toner tank. This maintains stable TC ratio and consistent image quality while preserving continuous printing capability.
Solution Approach 2:
The partition wall serves as an intermediary that blocks carrier migration while permitting controlled toner transfer. This mediator ensures that the TC ratio remains stable during continuous operation, preventing image quality deterioration while maintaining productivity.
3Quantity of substance
If the boundary area between first space and second space is open, then toner can flow freely, but carriers leak and TC ratio becomes unstable
Solution Approach 1:
The boundary area between the first and second spaces is designed with specific local properties - it is closed by toner or developer at certain locations to prevent carrier leakage while allowing controlled toner flow. This local quality differentiation resolves the contradiction between toner supply and TC ratio stability.
Solution Approach 2:
The closed boundary area acts as an intermediary barrier that prevents carrier leakage while still allowing toner to flow through controlled paths. This mediator structure maintains TC ratio stability while ensuring sufficient toner supply to the developing roller.
Data Source
AI summary
A developing device for forming a toner image on an image support member with a developer composed of toner and carriers, the developing device having: a main body in which a first space for a developer is made; a developer support member, which is located in the first space, for supporting the developer and for supplying toner of the developer to the image support member; and a toner tank in which a second space for toner is made, the second space leading to the first space via at least one boundary area; wherein the at least one boundary area between the first space and the second space is closed by the toner or the developer.