Toner Level Sensing via Container Vibration
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Solution Overview
Problem
There is a need for a system to measure the amount of toner in replaceable units of electrophotographic image forming devices to prevent damage and optimize printing by detecting when units are near empty or full, as existing systems lack effective toner level sensing mechanisms.
Innovation Solution
A toner level sensing assembly that uses a toner container with a reservoir and an impact member to impart an impulse force, causing vibration, which is sensed by a sensor to estimate the toner amount, with processing circuitry determining the toner level based on the vibration patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a toner level sensing system is implemented, then toner level measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent applies mechanical vibration by using an impact member to strike the toner container, causing it to vibrate. The vibration characteristics (amplitude, frequency, decay rate) are then measured by a sensor to determine toner level. This mechanical approach enables non-contact toner level sensing without complex electronic or optical systems.
Solution Approach 2:
The patent replaces complex electronic, optical, or capacitive sensing systems with a simple mechanical vibration-based sensing system. By using the natural vibration response of the toner container to an impact, the system achieves toner level measurement through mechanical properties rather than complex electronic fields or optical measurements.
2Device complexity
If vibration sensing method is used, then device complexity is reduced, but measurement precision may be affected by external factors
Solution Approach 1:
The patent employs feedback by continuously monitoring the vibration characteristics of the toner container and using this information to determine toner level. The system processes the vibration signals through feedback loops to compensate for external factors and maintain measurement accuracy despite variations in environmental conditions.
Solution Approach 2:
The patent utilizes parameter changes by measuring different vibration parameters (amplitude, frequency, decay rate) of the toner container to correlate with toner level. By analyzing multiple vibration parameters and their relationships, the system achieves precise toner level measurement while maintaining simple device structure.
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 accurate estimation of toner levels, preventing damage and optimizing printing by detecting near-empty or full states, enhancing the reliability and efficiency of image forming devices.
Implementation Method 1
an impact member configured to selectively impart an impulse force on the toner container to cause vibration of the toner container
Implementation Method 2
A sensor is configured to sense the vibration of the toner container upon the impact member imparting the impulse force on the toner container
Data Source
AI summary
A system for an electrophotographic image forming device includes a toner container having a reservoir for storing toner and an impact member configured to selectively impart an impulse force on the toner container to cause vibration of the toner container. A sensor is configured to sense the vibration of the toner container upon the impact member imparting the impulse force on the toner container. Processing circuitry in communication with the sensor is configured to determine an estimate of an amount of toner in the reservoir based on the sensed vibration of the toner container.