Developing Device Transport Screw Configuration for Developer Concentration Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In developing devices with one-directional recirculation systems and premix developing systems, maintaining stable developer concentration and preventing image quality issues due to fluctuating developer amounts, which leads to irregularities in output images.
Innovation Solution
A developing device with at least three transport screws, including a supply transport screw, a receiving transport screw, and an inclined transport screw, along with a discharge mechanism that stabilizes developer amounts by discharging surplus developer through a strategically positioned discharge port on the casing corresponding to the upper part of the inclined transport screw, ensuring efficient space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a one-directional recirculation system is used to stabilize developer concentration, then developer concentration stability is improved, but device complexity increases due to requiring separate transport screws for supply and recovery
Solution Approach 1:
The patent combines the supply transport screw and receiving transport screw into a single integrated transport screw that performs both functions. The transport screw simultaneously transports fresh developer to the developing sleeve and recovers used developer from it, eliminating the need for separate transport mechanisms while maintaining the one-directional recirculation system's concentration stability benefits.
Solution Approach 2:
The single transport screw is designed to perform multiple functions: it acts as both the supply transport screw that delivers fresh developer and the receiving transport screw that recovers used developer. This multi-functional design simplifies the overall device structure while preserving the functional separation needed for stable developer concentration maintenance.
2Stability of the object's composition
If multiple transport screws are used to maintain developer circulation, then developer concentration stability is improved, but the device occupies more space
Solution Approach 1:
The patent merges multiple transport screws into a single integrated transport screw that performs both supply and recovery functions. This consolidation significantly reduces the space required for transport mechanisms while maintaining the one-directional recirculation system that ensures stable developer concentration throughout the developing process.
3Stability of the object's composition
If carrier is continuously supplemented into the developing device, then developer concentration is maintained, but surplus developer accumulates causing image quality irregularities
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors developer concentration and carrier supplementation needs, then adjusts the supplementation rate accordingly. This prevents over-supplementation that would lead to surplus developer accumulation, while still maintaining adequate developer concentration for consistent image quality. The feedback control ensures that carrier is supplemented only when and where needed.
4Volume of moving object
If a compact design is pursued with fewer transport screws, then device volume is reduced, but developer concentration stability deteriorates
Solution Approach 1:
The patent successfully merges the functions of multiple transport screws into a single integrated transport screw, achieving a compact device design. Despite the reduced number of components, the system maintains developer concentration stability by implementing one-directional recirculation where fresh developer flows continuously through the developing sleeve and used developer is recovered and returned, ensuring consistent concentration throughout the process.
Data Source
AI summary
A developing device that can discharge developer by an amount of developer in the developing device increased by a carrier supplemented into the developing device includes a supply transport screw and a receiving transport screw in a top and bottom positional relationship, the rotational axes of the supply transport screw and the receiving transport screw are mutually parallel in relation to an image support member. The developing device also includes an inclined transport screw arranged at an incline between one end of the supply transport screw and an other end of the receiving transport screw. The developing device also includes a supply unit for supplying new carrier into a casing and a discharge port and discharge unit for discharging part of the developer housed in the casing to the outside, the discharge port provided on a part of the casing corresponding to an upper part of the inclined transport screw.