Developer Container Movable Wall Control for Image Forming Apparatus
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately detecting and managing the developer level in developer containers, leading to inefficient replenishment and potential clogging issues.
Innovation Solution
The image forming apparatus incorporates a developer container with a movable wall and a detection sensor system that uses a rotating body and a detection sensor to determine the developer level, controlling the movable wall's movement via a driving unit and controller to optimize developer supply and prevent clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection sensor is used to detect developer level, then replenishment timing can be determined, but false detection may occur leading to inaccurate developer level assessment
Solution Approach 1:
The system uses feedback from the detection sensor to monitor developer level continuously and adjusts the movable wall position accordingly. The detection sensor provides feedback signals that trigger automatic replenishment actions, creating a closed-loop control system that improves both measurement precision and reliability by continuously verifying developer levels and responding to actual conditions rather than relying on predetermined thresholds alone
Solution Approach 2:
The patent replaces manual or mechanical level assessment methods with an automated detection sensor system that uses optical or electromagnetic fields to detect developer levels. This substitution eliminates human error and mechanical wear associated with traditional level checking methods, providing more precise and reliable detection while enabling automated control of the replenishment process
2Productivity
If the movable wall moves to convey developer, then developer supply is automated, but clogging may occur due to improper developer flow control
Solution Approach 1:
The detection sensor provides continuous feedback on developer level and flow conditions to the control system. When the sensor detects abnormal conditions such as insufficient developer level or potential clogging, it triggers corrective actions by adjusting the movable wall position or pausing operation, preventing clogging before it occurs while maintaining automated supply efficiency
Solution Approach 2:
The movable wall is designed to move dynamically based on real-time detection sensor feedback rather than following a fixed schedule or pattern. The system adjusts the speed, position, and movement patterns of the movable wall to match actual developer consumption rates and flow conditions, preventing clogging by ensuring smooth, adaptive developer conveyance that responds to changing operational conditions
3Productivity
If the rotating body rotates near the discharge port, then developer flow is enhanced, but detection interference may occur
Solution Approach 1:
The detection sensor and rotating body are positioned in different spatial dimensions or planes to avoid direct interference. The sensor may be positioned radially or axially offset from the rotation path, detecting developer levels from a different dimension than where the rotating body creates turbulence. This dimensional separation allows the rotating body to enhance developer flow while the sensor maintains accurate detection without being disrupted by the rotation-induced flow patterns
Data Source
AI summary
An image forming apparatus includes a developer container having a movable wall therein, a determination unit, a movable wall driving unit, and a movable wall driving controller. The determination unit outputs first determination information when a number of outputs of a signal indicating that a detection sensor has detected a developer is less than a threshold value, and outputs second determination information when the number of outputs thereof is equal to or greater than the threshold value. The movable wall driving unit includes a first driving motor for moving the movable wall and a first driving circuit for controlling driving thereof. The movable wall driving controller includes a signal controller. The signal controller transmits a drive permission signal for the first driving motor when the first determination information is output, and transmits a drive non-permission signal for the first driving motor when the second determination information is output.