Toner Supply Switching via Optical Sensing
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Solution Overview
Problem
Conventional image forming apparatuses face frequent interruptions due to the need for frequent toner container replacements, as they lack an efficient system to monitor and manage toner levels in multiple containers, leading to inefficient operation and increased downtime.
Innovation Solution
The apparatus incorporates a toner supplying device with a remaining quantity sensing system that uses optical sensors and conveyance members to monitor and switch between two toner containers, ensuring continuous operation by automatically switching to a full container when one runs low, thereby minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If multiple toner containers are used to reduce replacement frequency, then toner supply continuity is improved, but device complexity increases due to need for monitoring and switching mechanisms
Solution Approach 1:
The patent replaces complex mechanical monitoring mechanisms with an optical sensing system. The optical sensor detects toner remaining quantities through optical absorption characteristics, eliminating the need for mechanical level sensors or complex electrical contacts while maintaining accurate monitoring of multiple toner containers.
Solution Approach 2:
The patent introduces a controller as an intermediary that automatically manages the switching between toner containers based on optical sensor feedback. This centralized control system simplifies the overall architecture by coordinating the clutch mechanism, conveyance members, and optical sensors, rather than requiring direct mechanical interconnections between all components.
2Device complexity
If manual toner container replacement is used, then device complexity is minimized, but productivity decreases due to frequent interruptions
Solution Approach 1:
The patent implements a self-service system where the image forming apparatus automatically monitors toner levels and performs container switching without user intervention. The optical sensor continuously detects toner quantities, and when one container is depleted, the system automatically activates the clutch to switch to the next container, ensuring continuous operation and eliminating manual replacement interruptions.
Solution Approach 2:
The patent establishes a feedback loop where optical sensors continuously monitor toner remaining quantities and provide real-time data to the controller. This feedback mechanism enables the system to proactively switch between toner containers before depletion occurs, maintaining uninterrupted image forming operations while keeping the system structure relatively simple.
3Measurement precision
If optical sensors are used to detect toner levels, then measurement precision is improved, but device complexity increases due to additional sensing components
Solution Approach 1:
The patent designs the optical sensor system to serve multiple functions: it detects toner remaining quantities, determines when switching is needed, and provides feedback for controller decision-making. By making the optical sensing system multi-functional, the patent reduces the need for separate sensors for each function, thereby improving measurement precision while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the optical sensing function with the existing toner conveyance and supply system. The optical sensors are integrated into the toner container structure or positioning mechanism, allowing the same component space to serve both conveyance and detection purposes. This merging approach enables precise toner level measurement without proportionally increasing overall system complexity.
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 allows for seamless toner supply management, reducing the frequency and duration of image forming interruptions by accurately sensing toner levels and automating the switching process between containers, enhancing operational efficiency.
Implementation Method 1
The optical sensor, which is provided singly, senses the rotation of the first and second sensing shafts
Implementation Method 2
The first sensing shaft has a first light-shielding plate that moves into and out of the optical path of the optical sensor
Data Source
AI summary
An image forming apparatus includes a developing device, a first container, a second container, and a toner supplying device. The toner supplying device includes first and second conveyance members that convey the toner in the first and second containers, and first and second sensing shafts that are used to sense the remaining quantities of toner there. The first and second sensing shafts have a first or second light-shielding plate that moves into and out of the optical path of an optical sensor. Of the first and second light-shielding plates, one rotates together with the first or second conveying member selectively driven and makes contact with the other, and thereby makes it move out of the optical path of the optical sensor.