Cover Opening Segmentation for Selective Cartridge Access

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Solution Overview

Problem

Existing image forming apparatuses allow for the accidental detachment of a drum cartridge when a user intends to detach only a toner cartridge, leading to operational inefficiencies and potential damage.

Innovation Solution

The image forming apparatus includes a main casing, a first cover, a drum cartridge, and a toner cartridge, where the first cover has a second opening smaller than the first opening, allowing the toner cartridge to pass through while preventing the drum cartridge from being detached inadvertently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the opening size is large enough to allow drum cartridge passage, then the drum cartridge can be detached, but the drum cartridge may be accidentally detached when only toner cartridge removal is intended

Engineering Contradiction:

Improvedrum cartridge detachmentVSAvoidinadvertent detachment prevention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The opening is segmented into two distinct openings: a first opening for drum cartridge passage and a second opening for toner cartridge passage. This segmentation allows independent access paths, enabling toner cartridge removal without risking drum cartridge detachment, thus resolving the contradiction between ease of operation and reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cover structure are assigned different functional qualities: the first opening region accommodates drum cartridge passage while the second opening region accommodates toner cartridge passage. This local differentiation ensures that toner cartridge removal operations occur in a restricted zone that prevents unintended drum cartridge movement.

Inventive Principle:

Principle #3Local quality

2Reliability

If the opening size is restricted to prevent drum cartridge passage, then inadvertent detachment is prevented, but the toner cartridge cannot be detached

Engineering Contradiction:

Improveinadvertent detachment preventionVSAvoidtoner cartridge detachment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution transitions from a single-dimensional opening size restriction to a two-dimensional opening configuration. By creating multiple openings with different dimensions and functions, the system enables selective access: the second opening is sized for toner cartridge passage while the first opening maintains drum cartridge access capability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If a single opening is used for both cartridges, then the structure is simple, but selective detachment is not possible

Engineering Contradiction:

Improveopening structureVSAvoidselective detachment capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The single opening is segmented into two functionally distinct openings: a first opening for drum cartridge operations and a second opening for toner cartridge operations. This segmentation provides selective detachment capability while maintaining relatively simple cover structure, resolving the contradiction between device complexity and adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cover structure achieves multi-functionality by incorporating multiple openings that serve different purposes: the first opening enables drum cartridge access while the second opening enables toner cartridge access. This universal design allows the same cover to support both cartridge types with appropriate access paths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250189924A1Image forming apparatus including cover having opening that allows toner cartridge to pass therethrough but does not allow drum cartridge to pass therethrough

Publication Date: 2025.06.12 BROTHER KOGYO KK

AI summary

An image forming apparatus includes: a main casing; a first cover; a drum cartridge; and a toner cartridge. The main casing has a first opening. The first cover is movable between: a first closed position in which the first cover closes the first opening; and a first open position in which the first opening is opened. The drum cartridge includes a photosensitive drum. The drum cartridge is attachable to and detachable from the main casing through the first opening in a state where the first cover is in the first open position. The toner cartridge is configured to accommodate toner therein. The toner cartridge is attachable to and detachable from the drum cartridge. The first cover has a second opening smaller than the first opening. The second opening allows the toner cartridge to pass therethrough but does not allow the drum cartridge to pass therethrough.