Developing Apparatus Drive Stop Timing Control
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Solution Overview
Problem
The existing developing apparatuses with vertical agitation type face issues with developer circulation imbalance due to differences in inertia forces between the developing sleeve and conveying screws, leading to potential developer overflow when stopping the drive mechanisms.
Innovation Solution
A controller is implemented to adjust the drive stop timing of the developing sleeve and conveying screws, ensuring the developing sleeve stops earlier than the second conveying screw, and the first conveying screw stops after the second, to maintain circulation balance and prevent overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the developing sleeve and conveying screws are stopped simultaneously, then the stopping process is simple, but developer overflow occurs due to inertia force differences
Solution Approach 1:
The controller stops the developing sleeve before stopping the conveying screws, anticipating the inertia-based timing mismatch. This preliminary action prevents developer overflow by ensuring the developing sleeve has already stopped and developer circulation has stabilized before the conveying screws cease movement.
Solution Approach 2:
The controller monitors the operational states of the developing sleeve and conveying screws, and adjusts their stop timing based on their respective inertia characteristics. This feedback mechanism ensures that the developing sleeve stops first, maintaining proper developer circulation balance and preventing overflow.
2Reliability
If the developing sleeve stops earlier than the conveying screws, then developer overflow is prevented, but the control timing becomes more complex
Solution Approach 1:
The controller is programmed to initiate the stop command for the developing sleeve at an earlier time point compared to the conveying screws. This time-differentiated control sequence is calculated based on the inertia forces of each component, ensuring reliable developer circulation without requiring complex real-time adjustments during the stopping process.
3Reliability
If the conveying screws continue running after the developing sleeve stops, then developer circulation is maintained, but energy is wasted
Solution Approach 1:
The controller stops the conveying screws immediately after the developing sleeve has stopped, rather than continuing to run them. This is sufficient because the developing sleeve has already ceased movement and developer circulation has stabilized, eliminating the need for continued screw operation and reducing energy waste while maintaining circulation stability.
Solution Approach 2:
The system allows the developer circulation to stabilize naturally after the developing sleeve stops, without requiring the conveying screws to continue running. The inertia and residual motion of the developer provide sufficient circulation stability during the transition period, eliminating unnecessary energy consumption.
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 solution effectively prevents developer overflow by synchronizing the stop times of the drive mechanisms based on inertia forces, ensuring balanced developer circulation and efficient collection within the apparatus.
Implementation Method 1
the developer is drawn to the developing sleeve 8 with a magnetic pole N1 of a magnet roller 8a as magnetic field generating unit which is provided non-rotatably at the inside of the developing sleeve 8
Implementation Method 2
the thickness of the developer is magnetically regulated in cooperation with a developer regulating edge 9 as a developer regulating member and the magnetic pole S1 which is arranged to be opposed thereto
Implementation Method 3
The developer is removed from the developing sleeve 8 by a repulsing magnetic field of the same polarity magnetic poles N1, N3 which are adjacently arranged at the inner side of the developer container 2
Data Source
AI summary
The image forming apparatus includes a developing chamber an agitating chamber, a first conveying screw which is arranged in the developing chamber and coveys developer from one end to the other end of the first chamber, a second conveying screw which is arranged in the agitating chamber and conveys developer from one end to the other end of the second chamber, a developing sleeve which bears developer supplied from the developing chamber and conveys the developer to the agitating chamber via a developing area opposed to a photosensitive drum, motors, which drive the developing sleeve, the first conveying screw and the second conveying screw, and a controller which controls drive of the developing sleeve and the second conveying screw so that trigger timing of drive stopping of at least the second conveying screw is to be later than trigger timing of drive stopping of the developing sleeve.