Toner Cartridge Detachment Sequencing for Leak-Free Replacement

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Solution Overview

Problem

In image forming apparatuses, users face uncertainty in detaching toner cartridges without leakage, and toner can spill due to the gravitational supply method, where the toner supply opening is positioned at the lower end during detachment.

Innovation Solution

The design positions the toner supply opening and toner inlet opening facing each other in an upward/downward direction, allowing the toner cartridge to be detached only when the process cartridge is removed from the housing, ensuring the toner cartridge can be detached without spilling toner.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the toner cartridge is positioned above the process cartridge with the toner supply opening at the lower end for gravitational supply, then toner can be supplied into the process cartridge using gravity, but toner accumulated around the toner supply opening is liable to be leaked outside during detachment

Engineering Contradiction:

Improvetoner supply mechanismVSAvoidtoner leakage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional detachment sequence by requiring the process cartridge to be removed from the housing first, then the toner cartridge can be safely detached from the process cartridge. This reversal of operation sequence prevents toner leakage that would occur if the toner cartridge were detached first while still positioned above the process cartridge with the supply opening facing downward.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent requires the preliminary action of removing the process cartridge from the housing before detaching the toner cartridge. This preliminary step changes the spatial relationship and orientation, ensuring that when the toner cartridge is subsequently detached, toner accumulation and leakage are prevented.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the toner cartridge is made detachable from the process cartridge while the process cartridge remains in the housing, then users can replace only the toner cartridge, but users face uncertainty and dither over the correct detachment procedure

Engineering Contradiction:

Improvetoner cartridge replacement flexibilityVSAvoiddetachment procedure clarity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent implements a dynamic access control mechanism where the detachability of the toner cartridge from the process cartridge changes based on the state of the process cartridge in the housing. When the process cartridge is in the housing, the toner cartridge is locked and cannot be detached. When the process cartridge is removed from the housing, the toner cartridge becomes detachable. This dynamic state-dependent accessibility eliminates user confusion by making the correct procedure the only possible procedure.

Inventive Principle:

Principle #15Dynamics

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 allows for secure detachment of the toner cartridge without toner leakage, providing users with clarity and ease in the replacement process.

Implementation Method 1

a lower end portion formed with a toner supply opening through which toner accommodated in the toner cartridge is supplied into the process cartridge by making use of gravity of the toner

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS12461484B2Image forming apparatus permitting user to imagine clear detachment procedure of toner cartridge from process cartridge

Publication Date: 2025.11.04 BROTHER KOGYO KK

AI summary

An image forming apparatus includes a housing and a first process cartridge. The first process cartridge is attachable to and detachable from the housing. The first process cartridge includes a first photosensitive drum, a first developing roller, and a developing frame. The developing frame has a toner inlet opening. A toner cartridge has a toner supply opening. The toner cartridge is positioned above the developing frame such that the toner supply opening and the toner inlet opening face with each other in upward/downward direction. In the state where the first process cartridge to which the toner cartridge is attached is attached to the housing, the toner cartridge is incapable of being detached from the first process cartridge. In a state where the first process cartridge to which the toner cartridge is attached is detached from the housing, the toner cartridge is detachable from the first process cartridge.