Medium Discharge Tray Curving to Prevent Sheet Deflection

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Solution Overview

Problem

Existing medium processing devices face issues with media alignment due to deflection during discharge, leading to improper stacking and reduced alignment quality on the stacking section.

Innovation Solution

A medium discharge device with an intermediate tray, pair of medium support sections, and a curve imparting section that aligns the rear end of the medium and applies a curve in the width direction, enhancing rigidity and ensuring proper discharge onto the stacking section.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the medium is discharged from the intermediate tray to the medium support section, then the medium is transported to the stacking section, but deflection forms in the medium causing the rear end to move back upstream and deteriorating alignment

Engineering Contradiction:

Improvemedium discharge efficiencyVSAvoidmedium alignment precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The curve imparting section applies a curve to the medium in advance during the discharge process, before the medium reaches the stacking section. This preliminary action prevents the medium rear end from moving back upstream due to deflection, ensuring proper alignment is maintained throughout the discharge and stacking process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The curve imparting section changes the physical state of the medium by applying a curve that warps it in the width direction. This parameter change (from flat to curved) increases the medium's rigidity in the discharge direction, preventing deflection and maintaining alignment precision during discharge.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If a step is formed between the intermediate tray and medium support section, then the medium can be discharged, but deflection occurs causing the medium rear end to return upstream

Engineering Contradiction:

Improvemedium discharge operationVSAvoidmedium shape stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The curve imparting section changes the medium's shape parameter by applying a curve that warps the medium in the width direction. This shape change increases rigidity and stabilizes the medium's composition during discharge, preventing the rear end from returning upstream despite the step formation between trays.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The curve imparting section applies a counteracting curve to the medium in advance, opposing the deflection force that would otherwise cause the rear end to return upstream. This preliminary anti-action neutralizes the destabilizing effect of the step formation between the intermediate tray and medium support section.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS12486132B2Medium discharge device, medium processing device, and recording system

Publication Date: 2025.12.02 SEIKO EPSON CORP

AI summary

A medium discharge device includes an intermediate tray on which the medium aligned by the alignment section is placed, a pair of medium support sections configured to support a front end of the medium placed on the intermediate tray, and configured to be openable and closable, a discharge section for discharging a medium from the intermediate tray to the medium support section, and a curve imparting section that imparts a curve that warps in the medium direction to the medium by coming into contact with the medium discharged by the discharge unit. A step is formed between the intermediate tray and the pair of medium support sections.