Ascendable Document Guide for High-Capacity Sheet Feeding

Solution Overview

Problem

Document feed devices with fixed trays have limited document loading capacity due to document bending and jamming issues when the number of sheets exceeds a certain threshold, and existing solutions to increase capacity, such as movable trays, are costly and complex.

Innovation Solution

A document feed device with a fixed tray and a movable document guide member that adjusts its position based on the number of sheets loaded, using a magnetic connection to prevent document bending and jamming, allowing for increased capacity without a complex structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed tray is used in a document feed device, then the device structure is simple and cost-effective, but the document loading capacity is limited due to document bending and jamming when the number of sheets exceeds a certain threshold

Engineering Contradiction:

Improvedevice structureVSAvoiddocument loading capacity

Core Design Contradiction:

Device complexityVSQuantity of substance

Solution Approach 1:

The document guide member is designed to be movable rather than fixed, allowing it to dynamically adjust its position between a first position (protruding from the inclined guide) and a second position (sunken below the inclined guide) based on the number of sheets loaded in the tray. This dynamic adjustment prevents document bending and jamming while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #15Dynamics

2Quantity of substance

If a movable tray is used to increase document loading capacity, then the document loading capacity increases, but the device becomes costly and complex

Engineering Contradiction:

Improvedocument loading capacityVSAvoiddevice structure

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

Instead of making the entire tray movable (which would increase device complexity and cost), the invention segments the problem by keeping the tray fixed and only making the document guide member movable. This localized movement allows the guide member to adapt to different sheet counts without requiring complex tray positioning mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The document guide member is designed to be movable rather than fixed, allowing it to dynamically adjust its position between a first position (protruding from the inclined guide) and a second position (sunken below the inclined guide) based on the number of sheets loaded in the tray. This dynamic adjustment prevents document bending and jamming while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #15Dynamics

3Quantity of substance

If the number of sheets loaded in the tray is increased, then the document loading capacity increases, but document bending and jamming occur more frequently

Engineering Contradiction:

Improvenumber of sheetsVSAvoiddocument feeding reliability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The document guide member is designed to be movable rather than fixed, allowing it to dynamically adjust its position between a first position (protruding from the inclined guide) and a second position (sunken below the inclined guide) based on the number of sheets loaded in the tray. This dynamic adjustment prevents document bending and jamming while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The document guide member's position is determined by the number of sheets loaded in the tray, creating a feedback mechanism where the guide member automatically adjusts to the current loading condition. This ensures that documents are properly guided regardless of the number of sheets present, maintaining reliable feeding operation.

Inventive Principle:

Principle #23Feedback

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

The solution enables a document feed device with a fixed tray to handle up to 200 sheets with reduced jamming and bending, maintaining a simple and cost-effective design by using a movable guide member that adjusts its position in response to sheet count.

Implementation Method 1

a magnetic connection member that connects the guide portion to the inclined guide when the document guide member is located at the first position

Methodology Applied

Scientific EffectMagnetic connection: Magnetism

Data Source

PatentUS12583696B2Document feed device with ascendable document guide member

Publication Date: 2026.03.24 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

A document feed device includes a tray in which a document is loaded, a pickup roller to be moved upward or downward to a standby position spaced apart from the document or to a pickup position to pick up the document in the tray, a separator to separate each sheet of the picked-up document, an inclined guide to connect an end of an exit of the tray to an entrance of the separator and to guide a bottom surface of the picked-up document, and a document guide member movable to a first position protruding from the inclined guide to guide the picked-up document or to a second position below the inclined guide.