Barrel-Shaped Sewing Machine Bed for Ballistic Fabric Curvature

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing textile sewing machines are inadequate for efficiently sewing multilayered contoured ballistic panels that require retention of an arcuate shape, as they lack a suitable work surface to conform to and maintain the curved shape of the fabric during stitching.

Innovation Solution

A textile sewing machine with a generally barrel-shaped, semi-cylindrical machine bed and an arcuate throat plate, equipped with a reciprocating needle chuck and electric motor, which allows for stitching multiple plies of ballistic fabric to conform to and retain a curved shape, using a combination of top and bottom threads to create a lockstitch.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a traditional flat machine bed is used, then the sewing machine structure is simple, but the fabric cannot conform to and retain the required curved shape during stitching

Engineering Contradiction:

Improvecurved shape retentionVSAvoidmachine bed structure

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The machine bed is designed with a curved, arcuate surface that matches the desired shape of the ballistic panel. This curvature allows the fabric to conform to the mold during stitching, ensuring the final product retains the required curved geometry for body armor applications.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Strength

If multiple plies of ballistic fabric are stacked for stitching, then the structural strength is improved, but the fabric layers tend to shift and misalign during the sewing process

Engineering Contradiction:

Improvestructural strengthVSAvoidfabric alignment

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The fabric plies are pre-stacked and positioned on the curved machine bed before stitching begins. The curved surface provides natural alignment and prevents shifting during the sewing process, ensuring precise layer registration throughout stitching.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The curved machine bed acts as an intermediary surface between the fabric plies and the stitching mechanism. It provides a stable, shaped platform that holds the fabric layers in correct alignment while the needle and thread join them together.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If a reciprocating needle mechanism is used for stitching, then the stitching speed and productivity are improved, but the needle may skip or bounce on the curved surface affecting stitch quality

Engineering Contradiction:

Improvestitching speedVSAvoidstitch quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The curved machine bed surface is designed to match the curvature of the fabric stack, providing continuous support to the reciprocating needle throughout its stroke. This prevents needle skipping or bouncing that would occur on a flat surface when stitching curved fabric layers.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS8267022B1Textile sewing machine with arcuate article-supporting machine bed

Publication Date: 2012.09.18 ARMORWORKS ENTERPRISES LLC

AI summary

A generally barrel-shaped machine bed is designed for a textile sewing machine. The sewing machine is adapted for stitching together with thread multiple overlying plies of flexible ballistic fabric. The machine bed defines a substantially semi-cylindrical work surface, such that the stitched ballistic fabric substantially conforms to a curved shape of the work surface and substantially retains the curved shape when sewn.