Sheet Feeder Movable Cassette for Media Switching

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Solution Overview

Problem

Conventional image-forming devices require complex operations and risk losing or mispositioning secondary sheet-feeding cassettes due to their detachable and interchangeable nature, complicating the process of switching between different sizes and types of recording media.

Innovation Solution

A sheet feeder system with a first cassette for larger media and a movable second cassette for smaller media, where the second cassette's mounting section can pivot to expose the accommodating section wider, allowing for easy switching and feeding without detaching from the first cassette, ensuring accurate and convenient media supply.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the second sheet-feeding cassette is detachably mounted on the first sheet-feeding cassette, then smaller sheets can be accommodated in the second cassette while larger sheets are accommodated in the first cassette, but the second cassette must be detached each time the first cassette is used after the second was used, complicating the operation

Engineering Contradiction:

Improveability to accommodate different sheet sizesVSAvoidoperation complexity when switching between cassettes

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The second sheet-feeding cassette is made movable relative to the first cassette along the sheet feeding direction. The cassette can be positioned at a first position where it does not interfere with sheet feeding from the first cassette, and at a second position where it does interfere. This dynamic positioning allows the system to adapt between accommodating smaller sheets (second cassette at second position) and larger sheets (second cassette at first position) without requiring detachment, thereby resolving the contradiction between versatility and ease of operation

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the second sheet-feeding cassette is detachably mounted on the first sheet-feeding cassette, then the sheets in the first cassette cannot be fed when the second cassette is mounted on the first cassette, but this requires frequent detachment and reattachment

Engineering Contradiction:

Improveability to use different sheet typesVSAvoidtime required for detachment and reattachment operations

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The second cassette is designed to move along the sheet feeding direction to a first position where it does not interfere with sheet feeding from the first cassette. This dynamic repositioning eliminates the need for frequent detachment and reattachment operations, allowing users to switch between sheet types by simply moving the second cassette along the guide rail, thereby resolving the contradiction between adaptability and time loss

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If the second sheet-feeding cassette is detachably mounted on the first sheet-feeding cassette, then a storage place is needed for the detached second cassette, and there is a danger that the detached cassette is lost

Engineering Contradiction:

Improveability to selectively use different cassettesVSAvoidrisk of losing the detached cassette

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The second cassette is designed to move along a guide rail to a first position where it does not interfere with sheet feeding from the first cassette. This dynamic positioning system eliminates the need for complete detachment and separate storage, as the cassette remains attached to the first cassette structure. The guide rail ensures the cassette stays in place when not in use, eliminating the risk of loss while maintaining adaptability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The second sheet-feeding cassette is nested on the first sheet-feeding cassette in such a way that it can be positioned at a first position where it does not interfere with sheet feeding. The nesting arrangement with the guide rail allows the second cassette to remain attached to the first cassette structure, eliminating the need for separate storage and preventing loss while maintaining versatility

Inventive Principle:

Principle #7Nested doll (Nesting)

4Adaptability or versatility

If the second sheet-feeding cassette is detachably mounted on the first sheet-feeding cassette, then an operation of correctly positioning the second cassette on the first cassette is complicated

Engineering Contradiction:

Improveability to mount second cassette on first cassetteVSAvoidcomplexity of correct positioning operation

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The second cassette is designed to move along a guide rail that provides predetermined positioning. The guide rail structure with its specific geometry automatically guides the second cassette into the correct position on the first cassette, eliminating the need for complex manual alignment operations. This dynamic movement along a constrained path simplifies the positioning operation while maintaining the ability to correctly mount the cassettes

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7694951B2Sheet feeder including a plurality of paper cassettes

Publication Date: 2010.04.13 BROTHER KOGYO KK

AI summary

A sheet feeder includes a first sheet-feeding cassette capable of accommodating a stack of recording medium and a second sheet-feeding cassette capable of accommodating a stack of recording medium smaller than the recording medium accommodated in the first sheet-feeding cassette. The second sheet-feeding cassette is disposed on the first sheet-feeding cassette so as to be movable with respect to the first sheet-feeding cassette. The second sheet-feeding cassette includes a first accommodating section and a second accommodating section. The second accommodating section is displaceable relative to the first accommodating section between a closed position and an open position. The second accommodating section exposes an accommodating section of the first sheet-feeding cassette wider in the open position than in the closed position.