Developer Circulation Mechanism for Toner Mixing Control
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Solution Overview
Problem
In image forming apparatuses, the mixing of different color toner due to electric discharge phenomena leads to toner repulsion and accumulation on downstream photosensitive drums, causing quality deterioration and reduced service life of the development device, especially when the drum cleaner retains a large amount of toner and it is not effectively collected.
Innovation Solution
An image forming apparatus with a circulation mechanism that distributes and mixes toner between the development chamber and the developer storage chamber, including a detector to notify users when the toner level is low, allowing for timely replacement and preventing excessive mixing of different color toner, which includes a retaining member for photosensitive drums, a belt cleaner for toner collection, and detachable developer receptacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum cleaner retains a large amount of toner to collect excess toner from the photosensitive drum, then the toner collection efficiency is improved, but different color toner mixes in the development device due to electric discharge phenomenon
Solution Approach 1:
The patent converts the harmful electric discharge phenomenon into a beneficial effect by intentionally applying voltage to the drum cleaner to attract and collect toner. The same electric field that causes toner repulsion and mixing is harnessed to actively collect toner from the photosensitive drum surface, transforming a problematic phenomenon into a useful collection mechanism
Solution Approach 2:
The patent changes the electrical parameter (voltage) of the drum cleaner from a passive state to an active charged state. By applying appropriate voltage to the drum cleaner, the system controls toner movement through electric field manipulation, enabling precise toner collection while managing the electric discharge effects that cause toner mixing
2Ease of operation
If the drum cleaner collects toner via potential difference between electric charge of toner and voltage applied to the drum cleaner, then the toner is moved onto the photosensitive drum and transferred to the belt, but toner repulsion occurs when electric charge of toner becomes higher due to electric discharge phenomenon
Solution Approach 1:
The drum cleaner acts as an intermediary element between the photosensitive drum and the toner. By controlling the voltage on the drum cleaner, the system mediates toner movement through the electric field, enabling toner to be attracted from the drum surface and transferred to the belt while managing electric discharge effects that cause repulsion
3Adaptability or versatility
If different color toner moves onto downstream photosensitive drums due to electric discharge phenomenon, then the toner is redistributed across the system, but the service life of the development device is reduced due to toner mixing
Solution Approach 1:
The patent extracts the problematic toner mixing issue by implementing a dedicated drum cleaner that actively collects and removes toner from the photosensitive drum surface before it can be redistributed to downstream drums. This extraction of excess toner prevents the electric discharge-induced mixing that would otherwise occur during normal operation
Solution Approach 2:
The system implements a feedback mechanism where the drum cleaner continuously monitors and collects toner from the photosensitive drum surface. By maintaining appropriate voltage on the drum cleaner, the system responds to toner accumulation and prevents excessive mixing, thereby extending the service life of the development device through active control
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
The circulation mechanism ensures even distribution and mixing of toner, reducing the risk of toner accumulation and quality deterioration, thereby extending the service life of the developing unit by preventing excessive mixing of different color toner and notifying users to replace the developer receptacle when necessary.
Implementation Method 1
the controller causes the voltage applied to the drum cleaner to be reversed between plus and minus at the predetermined timing, so that toner retained on the drum cleaner moves onto the photosensitive drum
Implementation Method 2
a belt cleaner slidingly contacting with a belt to collect excess toner adhered on the belt
Implementation Method 3
a circulation mechanism configured to circulate developer between the development chamber and the developer storage chamber
Data Source
AI summary
An image forming apparatus includes: at least one retaining member configured to temporarily retain remaining developer remaining on a photosensitive member; a belt arranged opposite to a plurality of photosensitive members; a cleaning device collecting developer on the belt; a remaining developer collecting unit configured to cause the remaining developer retained by the retaining member to be transferred onto the belt via the photosensitive member and thereafter collected by the cleaning device; a circulation mechanism configured to circulate developer between the development chamber and the developer storage chamber; a detector detecting the amount of developer in the developer storage chamber; a determination unit configured to determine if the amount of developer in the developer storage chamber is less than a predetermined amount; and a notifying unit notifying to replace a developer receptacle when the amount of developer stored in the developer storage chamber becomes less than the predetermined amount.