Process Cartridge Contact Surface Positioning to Prevent Contamination

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Solution Overview

Problem

In conventional process cartridges, the electrical contact surfaces of the developing and drum cartridges are prone to contamination when users operate the lock lever, as these surfaces are positioned opposite to the lock lever with respect to the casing, increasing the likelihood of accidental contact and contamination.

Innovation Solution

The electrical contact surfaces of the developing and drum cartridges are positioned opposite to the lock lever with respect to the casing, ensuring that when the user operates the lock lever, contact with these surfaces is minimized, thereby reducing the risk of contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the electrical contact surface of the drum cartridge is positioned at the other end portion of the drum frame in the first direction, then the electrical contact surfaces are positioned away from the lock lever operation area, but the user's hand may still touch the electrical contact surface of the developing cartridge when operating the lock lever, resulting in contamination

Engineering Contradiction:

Improvecontamination of electrical contact surfaceVSAvoidoperation of lock lever

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent positions the electrical contact surfaces in the first direction (longitudinal direction of the process cartridge) at locations opposite to the lock lever, utilizing the longitudinal dimension to separate the contact surfaces from the lock lever operation area. This spatial arrangement in a different dimension prevents hand contact contamination while maintaining ease of lock lever operation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The casing of the developing cartridge serves as an intermediary barrier that physically separates the electrical contact surfaces from the lock lever operation area. The contact surfaces are positioned on the outer surface of the casing at locations that are spatially separated from the lock lever, using the casing structure itself as a protective intermediary.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the electrical contact surface is positioned at one end portion of the casing, then the structure is simplified, but the electrical contact surface is prone to accidental contact and contamination by user's hand during lock lever operation

Engineering Contradiction:

Improvestructure of electrical contact surface positioningVSAvoidcontamination of electrical contact surface

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent employs asymmetric positioning of the electrical contact surfaces relative to the lock lever. Instead of symmetric or centralized positioning that would place contact surfaces near the lock lever operation area, the contact surfaces are positioned asymmetrically at end portions of the casing in the first direction, opposite to the lock lever. This asymmetric arrangement maintains structural simplicity while preventing hand contact contamination.

Inventive Principle:

Principle #4Asymmetry

3Object-affected harmful factors

If the electrical contact surfaces are positioned opposite to the lock lever with respect to the casing, then contamination is prevented, but the arrangement requires specific spatial configuration

Engineering Contradiction:

Improvecontamination preventionVSAvoidspatial configuration of electrical contact surfaces

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent segments the process cartridge into distinct functional zones along the first direction: the lock lever operation area and the electrical contact surface area. By positioning the electrical contact surfaces at end portions opposite to the lock lever, the design creates spatial segmentation that prevents interference between lock lever operation and contact surface access, achieving contamination prevention through functional zone separation.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11567446B2Process cartridge configured of developing cartridge including electrical contact surface, and drum cartridge including electrical contact surface and lock lever

Publication Date: 2023.01.31 BROTHER KOGYO KK

AI summary

A process cartridge includes a developing cartridge and a drum cartridge. The developing cartridge includes: a casing; a developing roller rotatable about a developing axis extending in a first direction; and a development-side IC chip having a development-side electrical contact surface. The drum cartridge includes: a drum frame; a photosensitive drum rotatable about a drum axis extending in the first direction; a drum-side IC chip having a drum-side electrical contact surface; and a lock lever configured to lock the developing cartridge to the drum frame. The development-side electrical contact surface and the drum-side electrical contact surface are positioned opposite to the lock lever with respect to the casing in the first direction in a state where the developing cartridge is attached to the drum frame.