Movable Electrical Contact Surface for Drum Cartridge Stability

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Solution Overview

Problem

In electro-photographic image-forming apparatuses, the movement of the drum cartridge relative to the main body during printing operations leads to a change in the positional relationship between the electrical terminal of the main body and the electrical contact surface of the drum cartridge, resulting in unstable electrical connections due to relative sliding motion and rubbing.

Innovation Solution

The drum cartridge is designed with a movable electrical contact surface positioned on the outer surface of the second drum frame, allowing it to move relative to the second drum frame in a predetermined direction. This configuration ensures that the electrical contact surface maintains effective contact with the electrical terminal of the main body, even during movement of the drum cartridge, thereby stabilizing the electrical connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the electrical contact surface is fixed to the outer surface of the drum cartridge, then the structure is simple and easy to manufacture, but the electrical connection becomes unstable due to relative sliding motion during drum cartridge movement

Engineering Contradiction:

Improveease of manufactureVSAvoidelectrical connection stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The electrical contact surface is designed to be movable relative to the drum cartridge body, transitioning from a fixed static structure to a dynamic adjustable structure. This allows the contact surface to maintain optimal position and contact pressure with the electrical terminal despite drum cartridge movement, resolving the contradiction between manufacturing simplicity and connection stability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A movable contact surface mechanism acts as an intermediary between the drum cartridge and the electrical terminal. This intermediary component absorbs the relative movement and maintains stable electrical connection, preventing direct sliding friction between the terminal and the contact surface while ensuring reliable data communication.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the electrical contact surface is made larger to ensure stable contact, then the electrical connection reliability improves, but the size of the drum cartridge increases

Engineering Contradiction:

Improveelectrical connection stabilityVSAvoiddrum cartridge size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

By making the electrical contact surface movable rather than fixed, the system can achieve stable electrical connection with a smaller contact area. The movable mechanism compensates for position variations, eliminating the need to increase contact surface area to ensure reliable connection, thus maintaining compact drum cartridge dimensions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the positional parameter of the electrical contact surface relative to the drum cartridge body, allowing it to move in a predetermined direction. This parameter change enables the contact surface to maintain optimal contact with the electrical terminal without requiring increased surface area, resolving the contradiction between connection reliability and device compactness.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the electrical contact surface is fixed, then the manufacturing precision requirements are lower, but rubbing and wear occur during drum cartridge movement

Engineering Contradiction:

Improvemanufacturing precisionVSAvoidfrictional wear

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The movable electrical contact surface design allows the contact interface to dynamically adjust its position, preventing sustained sliding friction and rubbing between the electrical terminal and the contact surface. This dynamic adjustment reduces mechanical wear and extends the service life of the electrical connection components.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention converts the potential harm of relative movement (which causes rubbing and wear) into a beneficial feature by allowing the contact surface to move in a controlled predetermined direction. This controlled movement prevents unwanted friction while maintaining electrical connection, transforming the problematic relative motion into a solution for reducing wear.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12242223B2Drum cartridge including movable electrical contact surface, and image-forming apparatus using the same

Publication Date: 2025.03.04 BROTHER KOGYO KK

AI summary

A drum cartridge includes: a photosensitive drum rotatable about an axis extending in a first direction; a first drum frame to which a developing cartridge is attachable; and a second drum frame having an outer surface; and a memory having an electrical contact surface. The first drum frame is at one end portion of the drum cartridge in a second direction and the second drum frame is at another end portion of the drum cartridge in the second direction. The electrical contact surface is positioned at the outer surface of the second drum frame and is movable in a predetermined direction relative to the second drum frame.