Variable Speed Developing Device for Reliable Developer Supply
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Solution Overview
Problem
Existing developing devices face challenges in reliably supplying developer to the developing member, as the rotational speed ratio between the first and second transport members is constant, limiting the efficiency of developer circulation and supply.
Innovation Solution
A developing device with a first and second transport member arranged vertically, allowing for adjustable rotational speed ratios between the developing member and the transport members, enabling more effective developer circulation and supply by independent power sources or clutch mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first and second transport members are rotated at a constant rotational speed ratio, then the device structure is simple, but the reliable supply of developer to the developing member is insufficient
Solution Approach 1:
The patent applies the dynamics principle by making the rotational speed ratio between the first and second transport members variable rather than constant. The driving device allows independent control of each transport member's rotational speed, enabling dynamic adjustment of the speed ratio to optimize developer supply reliability under different operating conditions while maintaining a relatively simple overall device structure.
2Productivity
If the rotational speed ratio between transport members is constant, then the control system is simple, but the efficiency of developer circulation is limited
Solution Approach 1:
The patent implements dynamic control of the transport members' rotational speeds to enhance developer circulation efficiency. The driving device enables independent speed adjustment of each transport member, allowing the system to adapt to varying developer circulation requirements and improve productivity without requiring a fundamentally complex control system architecture.
Solution Approach 2:
The patent applies parameter changes by varying the rotational speed parameters of the first and second transport members independently. This allows optimization of the speed ratio parameter to maximize developer circulation efficiency under different operating conditions, transforming a fixed parameter system into a variable parameter system for improved productivity.
3Productivity
If the rotational speed of transport members is fixed, then the mechanical structure is simple, but the efficiency of developer supply is reduced
Solution Approach 1:
The patent employs the dynamics principle by enabling variable rotational speeds for the transport members through a driving device that allows independent speed control. This dynamic capability improves developer supply efficiency by adapting to different operational requirements while maintaining a relatively simple mechanical structure without requiring complex variable speed mechanisms.
Data Source
AI summary
A developing device includes a first transport member and a second transport member that are respectively disposed in a first transport path and a second transport path arranged in a vertical direction and that transport developer so as to circulate the developer between the first transport path and the second transport path; a developing member that is disposed to face the first transport path and that receives the developer from the first transport path; and a driving device that operates such that a relative speed ratio between a rotational speed of the developing member and a rotational speed of the second transport member is changeable.