Image Reader Feed Switching Using a One-Way Clutch

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Solution Overview

Problem

The use of a dedicated power source for switching between separation and non-separation feed modes in image reading devices increases the cost due to the need for additional components like a control circuit and encoder.

Innovation Solution

An image reading device with a feed roller, separation roller, and a switching mechanism using a one-way clutch to transmit driving force in a reverse rotation direction, eliminating the need for a dedicated power source for switching between separation and non-separation feed modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a dedicated power source is used for switching between separation feed and non-separation feed, then switching functionality is achieved, but device cost increases significantly

Engineering Contradiction:

Improveswitching between separation feed and non-separation feedVSAvoidcost of control circuit, encoder, and power source

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The feed roller serves multiple functions: it feeds the medium downstream during normal operation and, when rotated in reverse, directly drives the separation roller upstream to perform separation. This eliminates the need for a dedicated power source and control system for separation, as the feed roller's motion is reused for both feeding and separation functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The driving force from the feed roller is merged with the separation roller through direct mechanical contact. When the feed roller rotates in reverse, its driving force is transmitted to the separation roller, combining the feeding and separation functions into a single integrated mechanism rather than using separate power sources.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If a dedicated power source is used for switching between separation feed and non-separation feed, then switching functionality is achieved, but the number of components increases

Engineering Contradiction:

Improveswitching between separation feed and non-separation feedVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The feed roller is designed to perform dual functions: feeding the medium during normal operation and driving the separation roller in reverse for separation. This eliminates the need for separate components such as a dedicated separation motor, encoder, and control circuit, reducing the overall component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The feed roller's own motion is used to drive the separation roller when needed. The system uses its existing operational motion (reverse rotation of the feed roller) to activate the separation function, eliminating the need for external dedicated components and making the system self-sufficient.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the feed roller rotates in reverse to drive the separation roller, then separation function is achieved, but power transmission control becomes complex

Engineering Contradiction:

Improveseparation functionVSAvoidpower transmission control

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The power transmission between the feed roller and separation roller is made dynamic rather than fixed. The separation roller is engaged or disengaged from the feed roller based on operational needs, allowing the system to switch between feeding and separation modes by controlling the dynamic engagement state rather than using complex electronic control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent replaces the electronic control system (encoder, motor control circuit) with a direct mechanical transmission system. The reverse rotation of the feed roller mechanically drives the separation roller through direct contact, substituting complex electronic power transmission control with a simple mechanical coupling mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 configuration reduces the cost of the device by eliminating the need for a dedicated power source and allows for efficient switching between feed modes without increasing complexity.

Implementation Method 1

a one-way clutch that does not transmit power of the first drive source to the input gear when the first drive source rotates in a first rotation direction, which is a rotation direction during medium feeding, and transmits the power of the first drive source to the input gear when the first drive source rotates in a second rotation direction, which is opposite to the first rotation direction

Methodology Applied

Scientific EffectOne-way clutch mechanism: Ratchet

Data Source

PatentUS12534320B2Image reading device

Publication Date: 2026.01.27 SEIKO EPSON CORP

AI summary

An image reading device includes a first power transmission section configured to transmit a driving force to the input gear, wherein the first power transmission section is configured to transmit the driving force from a first drive source that drives the feed roller to the input gear and furthermore, the first power transmission section includes a one-way clutch that does not transmit the power of the first drive source to the input gear when the first drive source rotates in a first rotation direction, which is a rotation direction during medium feeding, and transmits the power of the first drive source to the input gear when the first drive source rotates in a second rotation direction, which is opposite to the first rotation direction.