Curved Multi-Channel String Stretching for Even Guitar Tension

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Solution Overview

Problem

Existing stretching devices for instrument strings often result in uneven tension distribution during the manufacturing process, which can lead to performance issues and potential damage to stringed instruments when strings are hand-stretched after installation.

Innovation Solution

A curved panel with longitudinal channels and a stretching unit that includes a clamping mechanism, where the stretching unit is actuatable to lift the clamping unit, ensuring even tension distribution along the instrument strings as they are stretched through the channels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional stretching devices are used, then the stretching process can be completed, but uneven tension distribution occurs along the instrument strings

Engineering Contradiction:

Improvetension distribution uniformityVSAvoidstring performance consistency

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The curved panel is divided into multiple channels (e.g., 3-5 channels) that extend longitudinally through the panel. Each channel independently guides and stretches a portion of the instrument string, ensuring uniform tension distribution along the entire string length. This segmentation approach directly resolves the uneven tension problem by distributing the stretching force across multiple parallel pathways.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The panel is designed with a curved surface rather than a flat surface. This curvature allows the panel to conform to the natural shape of instrument strings and provides optimal contact points for stretching. The curved geometry ensures that tension is evenly distributed along the string by following its natural arc, preventing localized stress concentrations.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If manual stretching is performed after installation, then strings can be adjusted, but potential damage occurs to stringed instruments

Engineering Contradiction:

Improvestring adjustment capabilityVSAvoidinstrument damage risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The device performs the stretching operation on instrument strings before they are installed on the actual stringed instrument. By pre-stretching the strings to their final tension and length specifications, the need for subsequent manual stretching after installation is eliminated. This preliminary action prevents damage to the instrument while still achieving the necessary string adjustment.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If multiple strings are stretched simultaneously, then productivity increases, but device complexity increases

Engineering Contradiction:

Improvestring stretching throughputVSAvoidpanel and channel structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The curved panel serves multiple functions simultaneously: it provides structural support, defines multiple stretching channels, guides string positioning, and distributes tension forces. This multi-functionality allows multiple strings to be stretched at once without requiring separate mechanisms for each function, thereby increasing productivity while limiting complexity growth.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Multiple stretching channels are integrated into a single curved panel structure rather than using separate devices for each string. The channels are combined in a compact arrangement where they share common support structures and tensioning mechanisms, enabling simultaneous stretching of multiple strings with a unified device rather than multiple individual devices.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11666963B1Guitar string stretching assembly

Publication Date: 2023.06.06 ZAROLA JOSEPH ANTHONY

AI summary

A instrument string stretching assembly for stretching instrument strings during the manufacturing process includes a curved panel that has a plurality of channels each extending through the curved panel. A plurality of instrument strings can be inserted into a respective one of the channels having each of the instrument strings extending outwardly through the respective channel. A stretching unit is aligned with each of the plurality of channels in the curved panel and the stretching unit is actuatable into a lifting condition or a lowering condition. A clamping unit is attached to the stretching unit to grip each of the plurality of instrument strings. The stretching unit lifts the clamping unit upwardly thereby stretching the instrument strings along the plurality of channels in the curved panel.