Developing Device Upstream Detection for Stable Toner Readings
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Solution Overview
Problem
Existing developing devices face challenges in accurately detecting toner concentration due to unstable developer density and potential erroneous readings, particularly at positions where the developer is pumped up, leading to inefficiencies and space constraints.
Innovation Solution
The developing device incorporates an ATC sensor positioned upstream of the developer transport path, adjacent to an air flow path and below the agitation unit, with a magnetic paddle to remove excess developer and maintain stable density detection, while achieving space savings by optimizing sensor placement and airflow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection unit is positioned at the pump-up location to detect toner concentration, then the detection function is integrated into the transport path, but the developer density becomes unstable causing erroneous detection readings
Solution Approach 1:
The detection unit is positioned upstream of the pump-up location in the transport path, allowing toner concentration detection to occur before the developer reaches the unstable pump-up region. This preliminary detection approach ensures that measurements are taken when developer density is stable, preventing erroneous readings while maintaining integrated detection functionality.
2Volume of moving object
If the detection unit is disposed below the agitation and transportation unit to save space, then the device achieves compact layout, but the developer density at detection position becomes unstable
Solution Approach 1:
The detection unit is positioned in the horizontal transport direction upstream of the pump-up location, rather than directly below the agitation unit. This spatial repositioning in the transport dimension allows the detection unit to operate in a region of stable developer density while maintaining the compact vertical arrangement, thus preserving both measurement precision and space efficiency.
3Temperature
If the air flow path is positioned adjacent to the transport path to manage airflow, then cooling and dust removal are improved, but the detection unit may be affected by air flow causing detection errors
Solution Approach 1:
The detection unit is positioned upstream of the air flow path in the transport direction, creating a spatial separation between the detection zone and the air flow zone. This arrangement allows the air flow path to perform its cooling and dust removal functions downstream without directly interfering with the toner concentration measurements, effectively using spatial zoning to prevent harmful interactions.
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 configuration enhances the accuracy of toner concentration detection and prevents erroneous readings, while maintaining a compact design by stabilizing developer density and managing airflow, thus improving operational efficiency.
Implementation Method 1
an air flow path that is provided to be adjacent to and below the transport path in the vertical direction and through which air that is taken in through an inflow port along the transport direction of the agitation and transportation unit flows toward a discharge port
Implementation Method 2
a detection unit that detects a concentration of the toner in the developer
Data Source
AI summary
A developing device includes: a supply and transportation unit that transports a developer containing toner and a carrier to a developer holder while supplying the developer to the developer holder, the developer holder holding the developer; an agitation and transportation unit that transports the developer while agitating the developer in a hollow transport path that is disposed to be adjacent to and below the supply and transportation unit in a vertical direction; an upward transport path that is disposed on a downstream side in a transport direction of the agitation and transportation unit and through which the developer transported from the agitation and transportation unit is sent to the supply and transportation unit on an upper side; an air flow path that is provided to be adjacent to and below the transport path in the vertical direction and through which air that is taken in through an inflow port along the transport direction of the agitation and transportation unit flows toward a discharge port; and a detection unit that detects a concentration of the toner in the developer at a position upstream of the upward transport path in the transport direction of the agitation and transportation unit, the detection unit being disposed in the air flow path.