Detachable Sheet Tray Alignment for Stable Large-Sheet Feeding

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Solution Overview

Problem

Conventional sheet feeding apparatuses for large-sized sheets become bulky and heavy due to the inclusion of restricting members that adjust the sheet position in the width direction, compromising their compactness and weight.

Innovation Solution

A sheet feeding apparatus with a detachable extended sheet tray and indication portions that allow precise positioning of sheet ends in the width direction, using detachable side restricting members and indication markings to adjust sheet alignment without increasing weight or size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a restricting member is provided to restrict both ends of a long sheet in the width direction, then the sheet position can be adjusted, but the weight and size of the sheet feeding apparatus becomes large

Engineering Contradiction:

Improvesheet position adjustmentVSAvoidapparatus weight

Core Design Contradiction:

Ease of operationVSWeight of moving object

Solution Approach 1:

The patent extracts the sheet end positioning function from a physical restricting member and implements it through indication portions (markings) on the sheet stacking portion. Users align sheet ends with these markings instead of using mechanical restrictors, eliminating the need for heavy restricting members while maintaining positioning capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical restricting member system with a visual indication system. Instead of using physical barriers to constrain sheet position, the invention uses markings that guide users to position sheets correctly, substituting mechanical constraint with visual guidance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If a restricting member is provided to restrict both ends of a long sheet in the width direction, then the sheet position can be adjusted, but the size of the sheet feeding apparatus becomes large

Engineering Contradiction:

Improvesheet position adjustmentVSAvoidapparatus size

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent removes the physical restricting member and extracts only the essential function of indicating sheet end positions. The indication portions are integrated into the sheet stacking portion surface, eliminating the need for additional space-consuming mechanical components

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the indication function with the sheet stacking portion itself. The indication portions are formed directly on the stacking surface, combining the structural element (stacking portion) with the guidance function (indication) into a single integrated component, reducing overall apparatus size

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250355394A1Sheet feeding apparatus and image forming apparatus

Publication Date: 2025.11.20 CANON KK

AI summary

Disclosed is a sheet feeding apparatus including a first sheet stacking portion on which a sheet is stacked; a sheet side end restricting portion that restricts a side end of the sheet stacked on the first sheet stacking portion; and a second sheet stacking portion on which the sheet is stacked. The sheet feeding apparatus further comprises an indication portion provided on the second stacking portion, the indication portion indicating positions of both side ends of the sheet in the state where the side end of the sheet is restricted by the sheet side end restricting portion. The second sheet stacking portion is provided in a detachably attachable manner upstream of the first sheet stacking portion in a feeding direction of the sheet.