Rotary Tray Contact Detection for Correct Toner Cartridge Placement

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Solution Overview

Problem

Existing image forming apparatuses face the risk of toner color mixing due to incorrect attachment of toner cartridges to developing devices, leading to increased costs from necessary shape changes in cartridges to prevent this issue.

Innovation Solution

The apparatus includes a rotary with separate developing chambers and trays for each cartridge, equipped with conductive contact members that generate distinct electrical signals based on correct cartridge attachments, preventing incorrect placements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the shapes of the toner cartridges are changed on a per-color basis to prevent attachment of a toner cartridge to a wrong developing device, then the reliability of correct cartridge attachment is improved, but the device complexity and manufacturing cost increase due to the need for multiple dies

Engineering Contradiction:

Improvecorrect cartridge attachmentVSAvoidnumber of dies

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cartridge attachment verification is segmented into multiple detection stages: tray-level detection (first detection unit) and cartridge-level detection (second detection unit). Each stage independently verifies specific aspects of correct attachment, allowing a single cartridge design to be verified through multiple detection mechanisms rather than requiring multiple cartridge designs

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tray serves as an intermediary component with its own detection unit that verifies cartridge attachment before the cartridge itself is inserted into the developing device. This intermediate verification layer allows the cartridge design to remain simple while adding a layer of protection through the tray's detection capability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

Engineering Contradiction:

Improvecorrect cartridge attachmentVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The verification function is segmented between the tray (with detection unit) and the cartridge (with contact member), allowing both components to use standardized designs while maintaining color-specific verification capabilities through the combination of these components

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tray is designed with universal applicability across different colors, incorporating a detection unit that can verify attachment for any cartridge color. This multi-functional tray design eliminates the need for color-specific tray variations, reducing manufacturing complexity and cost

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If a detection system with contact members and detection units is added to verify cartridge attachment, then the reliability of preventing wrong attachment is improved, but the device complexity increases

Engineering Contradiction:

Improvepreventing wrong attachmentVSAvoiddetection system structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The detection functionality is merged into existing structural components: the tray's contact members are integrated with the tray structure itself, and the cartridge's contact members are part of the cartridge assembly. This merging eliminates the need for separate, standalone detection devices, reducing overall system complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The detection system is designed to automatically verify attachment status without requiring external intervention. The contact members on both tray and cartridge automatically engage when attached, triggering the detection units to verify correct placement, making the system self-verifying rather than requiring additional manual or automated inspection equipment

Inventive Principle:

Principle #25Self-service

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 solution effectively prevents toner color mixing while maintaining cost-effectiveness by ensuring correct cartridge placement, enhancing operational reliability and reducing unnecessary die costs.

Implementation Method 1

a circuit including the first tray contact member or the second tray contact member and including a detector, wherein the first cartridge includes a conductive first cartridge contact member, the second cartridge includes a conductive second cartridge contact member

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250321510A1Image forming apparatus

Publication Date: 2025.10.16 CANON KK

AI summary

An image forming apparatus has a rotary including first and second trays supporting the first and second cartridges respectively which are displaced between first and second positions, and a circuit including first and second tray contact members and including a detector. The first and second cartridges include conductive first and second cartridge contact members, respectively. When the first tray is located at the first position and the first cartridge is supported by the first tray, the first cartridge contact member and the first tray contact member come into contact with each other, and thus a signal in the circuit is detected. When the first tray is located at the first position and the second cartridge is supported by the first tray, the second cartridge contact member and the first tray contact member do not come into contact with each other.