Shape Memory Alloy Actuator for Endorsing Roller Positioning

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Solution Overview

Problem

Conventional inkjet printing mechanisms for document endorsements in financial transactions are inefficient, introduce security vulnerabilities, and use fugitive inks that can be erased, while electromechanical actuators in print roller devices are not rated for high cycle counts and emit electromagnetic interference.

Innovation Solution

A shape memory alloy actuator is used to move an endorsing roller between retracted and printing positions in an automated document processing system, eliminating the need for electromechanical actuators and providing a secure, non-fugitive marking solution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electromechanical actuators (solenoids or electric motors) are used to actuate the print roller, then the endorsing roller can be moved between printing and retracted positions, but the device is not rated for high cycle counts (millions of cycles) and emits electromagnetic interference that disrupts controlling electronics

Engineering Contradiction:

Improvecycle ratingVSAvoidelectromagnetic interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces electromechanical actuators (solenoids or electric motors) with a mechanical spring-based actuation system. The spring provides the necessary force to move the endorsing roller between printing and retracted positions without generating electromagnetic interference, thereby resolving the contradiction between reliability for high-cycle operation and elimination of harmful electromagnetic emissions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the actuation mechanism from electrical to mechanical parameters. By using a spring with specific elastic properties and pre-load forces, the system achieves reliable high-cycle operation without the electromagnetic interference inherent in electrical actuators, transforming the operating parameters from electrical domain to mechanical domain.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If inkjet printing mechanisms are used for endorsements, then programmable messages can be printed, but the inks are fugitive and can be eradicated using water or alcohol-based solvents, allowing fraudulent use

Engineering Contradiction:

ImproveprogrammabilityVSAvoidsecurity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces the reusable but insecure inkjet printing system with a disposable-like approach using transfer paper containing non-fugitive ink. The transfer paper is consumed in each printing operation, and the non-fugitive ink permanently marks the document, eliminating the security vulnerability of erasable ink while maintaining the ability to print fixed-message endorsements reliably.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If inkjet printing mechanisms are used for endorsements, then high-speed application of programmable messages is possible, but the programmability must be paid for in system cost and introduces security vulnerabilities

Engineering Contradiction:

Improveprocessing speedVSAvoidsystem cost

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts the programmability feature from the printing system by using a fixed-message transfer paper approach. This eliminates the need for complex programmable inkjet printing mechanisms, reducing system cost and complexity while maintaining high-speed processing capability through the simple mechanical transfer paper insertion and printing process.

Inventive Principle:

Principle #2Taking out (Extraction)

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 shape memory alloy actuator enables precise, high-cycle operation without electromagnetic interference, ensuring secure and reliable document endorsements, reducing costs and enhancing processing efficiency.

Implementation Method 1

an automated document processing system employing a shape memory alloy actuator

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Implementation Method 2

applying a current across a shape memory alloy wire of a shape memory alloy actuator; moving an endorsing roller from a retracted position to a printing position in response to applying the current across the shape memory alloy wire

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Data Source

PatentUS8291819B2Rotary endorser for document processing employing a shape memory alloy actuator

Publication Date: 2012.10.23 DIGITAL CHECK CORP

AI summary

An actuation device for an endorsing roller in an automated document processing system is disclosed. The actuation device includes a shape memory alloy actuator interconnected with an endorsing roller, the shape memory alloy actuator interconnected with the endorsing roller and configured to be actuated to move the endorsing roller from a retracted position to a printing position.