Cleaning device and image forming device
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Solution Overview
Problem
Conventional electrostatic cleaning devices and image forming devices face challenges in stabilizing dust collection and achieving sufficient toner collection efficiency due to dependencies on the charging of brushes and the triboelectric properties of materials.
Innovation Solution
The proposed solution involves an electrostatic cleaning device and an image forming device with a configuration that includes a rotation brush, a rubbing unit, and a collecting unit. The rotation brush is designed to maintain a surface potential between 1500 V and 18000 V, with the collecting unit having a higher surface potential than the rotation brush. The rubbing unit is made of materials that are more positively charged in the triboelectric series than the brush, enhancing the electrostatic attraction and collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush is used to electrostatically attract dust on the floor surface, then dust collection is achieved, but the cleaning device fails to collect dust stably because the dust-collecting efficiency depends on how the brush is charged
Solution Approach 1:
The patent changes the parameter of surface potential from uncontrolled triboelectric charging to controlled electrostatic charging. By applying a controlled voltage (1500-18000 V) to the rotation brush, the surface potential is stabilized, ensuring consistent electrostatic attraction of dust particles regardless of variations in triboelectric charging conditions.
Solution Approach 2:
The patent introduces a charge controlling unit as an intermediary between the power supply and the rotation brush. This intermediary component regulates the charging process, ensuring that the brush maintains an optimal surface potential for dust collection by controlling the flow of electrical charge to the brush.
2Productivity
If an electrostatic collector is configured to collect toner using electrostatic force, then toner collection is achieved, but the collection efficiency is insufficient
Solution Approach 1:
The patent optimizes the surface potential parameter of the rotation brush to a specific range (1500-18000 V) that is particularly effective for toner collection. This controlled potential range ensures strong enough electrostatic attraction to collect toner efficiently while avoiding excessive charging that could cause other problems.
Solution Approach 2:
The patent makes the charging system dynamic by allowing the surface potential to be adjusted and controlled in real-time. The charge controlling unit can adapt the charging level based on operating conditions, ensuring optimal toner collection efficiency across different scenarios such as varying toner densities or brush rotation speeds.
3Force
If the brush surface potential is increased to improve dust attraction, then electrostatic attraction increases, but the brush may become overcharged causing instability in dust collection
Solution Approach 1:
The patent implements a feedback control mechanism where the charge controlling unit continuously monitors and adjusts the surface potential of the rotation brush. This feedback system ensures that the surface potential remains within the optimal range (1500-18000 V), preventing overcharging while maintaining sufficient electrostatic attraction for stable dust collection.
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 stabilizes dust collection on various surfaces and improves toner collection efficiency in image forming devices by optimizing the electrostatic charging and triboelectric interactions between the brush, rubbing unit, and collecting unit.
Implementation Method 1
material forming the rubbing unit is more on a positive side than material forming the brush with respect to a triboelectric series
Implementation Method 2
an absolute value of a surface potential of the rotation brush on a downstream side of the rubbing unit in the rotating direction of the rotation brush is not less than 1500 V and not more than 18000 V
Implementation Method 3
an absolute value of a surface potential of the collecting unit is higher than the absolute value of the surface potential of the rotation brush before the rotation brush contacts the collecting unit
Data Source
AI summary
A cleaning device including a frame body, a rotation brush, an opening through which a part of the brush is exposed, a rubbing unit rubbing against the brush positioned on an upstream side of the opening and on a downstream side of another member in a rotating direction of the rotation brush, and a collecting unit contacting the brush on a downstream side of the opening and on an upstream side of the rubbing unit, in which an absolute value of a surface potential of the rotation brush on a downstream of the rubbing unit is not less than 1500 V and not more than 18000 V, an absolute value of a surface potential of the collecting unit is higher than that of the rotation brush, and material forming the rubbing unit is more on a positive side than material forming the brush with respect to a triboelectric series.