Process Cartridge Support Frame and Spaced Seal for Stable Toner Supply

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Solution Overview

Problem

The challenge in existing process cartridges is that the development housing may not easily move relative to the photosensitive drum due to the weight of the toner cartridge, leading to potential toner leakage and instability in toner supply.

Innovation Solution

The process cartridge design includes a support frame that holds the toner cartridge stationary while allowing the development housing to move relative to the photosensitive drum, using a seal positioned away from the passage opening to minimize toner leakage and ensure stable toner supply.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If the development housing is configured to be movable relative to the photosensitive drum to maintain constant pressing force, then the pressing force stability is improved, but the development housing cannot easily move due to the weight of the toner cartridge

Engineering Contradiction:

Improvepressing force stabilityVSAvoidmovability of development housing

Core Design Contradiction:

ForceVSEase of operation

Solution Approach 1:

The system is divided into two independent movable units: the development housing that moves with the toner cartridge, and the support frame that remains stationary. This segmentation allows the development housing to maintain constant pressing force against the photosensitive drum while the toner cartridge can move freely without being constrained by a fixed support structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The seal acts as an intermediary element between the development housing and the support frame. It allows the development housing to move relative to the support frame while maintaining sealing, enabling the toner cartridge to move freely without directly contacting or constraining the support frame.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the seal is positioned close to the passage opening to prevent toner leakage, then the sealing effectiveness is improved, but the seal hinders the flow of toner from the toner cartridge to the development housing

Engineering Contradiction:

Improvesealing effectivenessVSAvoidtoner supply stability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The seal is positioned in a different spatial dimension relative to the passage opening - specifically, away from the passage opening rather than close to it. This dimensional repositioning allows the seal to maintain its sealing function while avoiding interference with the toner flow path through the passage opening.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12353163B2Process cartridge having support frame with passage opening, developing housing with reception opening, and seal

Publication Date: 2025.07.08 BROTHER KOGYO KK

AI summary

A drum frame includes first and second frames supporting a photosensitive drum, and a support frame configured to support a toner cartridge. The support frame is not movable relative to the photosensitive drum. The support frame has a passage opening through which toner from the toner cartridge passes in a state where the toner cartridge is supported by the support frame. A development housing has a reception opening configured to receive toner that has passed through the passage opening. The reception opening is larger than the passage opening. The development housing supports a development roller. The development housing is movable relative to the photosensitive drum. A seal is located around the passage opening and away from the passage opening. The seal is in contact with the support frame and an edge of the reception opening. The seal seals between the support frame and the edge of the reception opening.