Developing Cartridge Electrode Structure for Thin Cover Layout

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Solution Overview

Problem

Existing developing cartridges in image forming apparatuses are not designed to be thin while maintaining individual electrodes for the developing roller and supply roller, requiring a cover member with a predetermined thickness to accommodate contact point members.

Innovation Solution

The developing cartridge is designed with developing and supply electrodes that protrude parallel to their respective shafts, allowing for offset contact points that enable thin design without scraping the cartridge's sidewalls, and allowing for flexible layout arrangements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If contact point members are extended toward positions away from the developing roller and supply roller with U-shaped leading ends exposed through openings in the cover member, then individual electrodes can be provided to the developing roller and supply roller, but the cover member requires a predetermined thickness which prevents the developing cartridge from being thin

Engineering Contradiction:

Improveindividual electrode configurationVSAvoidcover member thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The contact point members are repositioned from the traditional configuration where they extend through the cover member thickness to a new configuration where they are arranged in a different spatial dimension. The leading ends of the contact point members are positioned to contact the electrodes at locations that do not require extensive cover member thickness, effectively changing the dimensional arrangement of the electrical connection components.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Instead of extending the contact point members outward through the cover member as in traditional designs, the invention inverts the approach by positioning the contact points to contact the electrodes from a different direction and arrangement, eliminating the need for the cover member to have significant thickness for accommodating the contact point structure.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If contact point members are positioned to contact electrodes, then power can be supplied to the developing roller and supply roller, but the contact point members and sidewalls experience wear during operation

Engineering Contradiction:

Improvepower connectionVSAvoidwear on contact point members and sidewalls

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention extracts the contact function from the cover member structure and relocates it to dedicated contact point members that are specifically designed for electrical connection. This separation allows the contact point members to be positioned optimally for power transmission while minimizing their contact with rotating components, thereby reducing wear on both the contact points and sidewalls.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The contact point members serve as intermediaries between the power supply system and the rotating electrodes. By using these dedicated intermediary components for electrical connection rather than having the cover member directly contact the electrodes, the design reduces wear on the sidewalls while maintaining reliable power transmission to the developing roller and supply roller.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design enables a thin developing cartridge with reduced wear on contact point members and sidewalls, enhancing freedom of layout and preventing wear during power connection.

Implementation Method 1

toner is supplied to the electrostatic latent image from the developing roller by a potential difference between the developing roller and the photosensitive drum

Methodology Applied

Scientific EffectElectrostatic potential difference: Electrostatics

Data Source

PatentUS20260023344A1Developing cartridge

Publication Date: 2026.01.22 BROTHER KOGYO KK

AI summary

A developing cartridge may include a housing configured to hold toner. The cartridge may further include a developing roller including a developing roller shaft, a supply roller including a supply roller shaft, a developing electrode and a supply electrode. The developing electrode and supply electrode may be configured to guide an electrical contact of an image forming apparatus in one or more directions. In some examples, the developing electrode and supply electrode may have angled surfaces that extend toward one another.