Cordless Stitch Remover Blade for Single-Layer Cutting

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Solution Overview

Problem

Existing motorized stitch removers are inefficient in cutting one layer of stitches at a time, often pulverize stitches, and have issues with internal shaft materials that can lead to motor damage and require a corded power source, limiting their use.

Innovation Solution

A cordless device with a high-powered motor, a brass shaft, and a blade with upper and lower teeth for precise cutting of one layer of stitches, using a rechargeable battery for power and a durable shaft to manage inertia forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a motorized stitch remover is used, then cutting speed and ease of operation are improved, but the device pulverizes stitches into debris that gets trapped in the fabric

Engineering Contradiction:

Improvecutting speedVSAvoidstitch debris

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The blade is designed with differentiated tooth configurations: upper teeth with cutting edges for severing stitches, and lower teeth with space between them to allow debris to fall through. This local differentiation of tooth functions prevents debris accumulation while maintaining cutting effectiveness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The blade is segmented into multiple teeth rather than a continuous cutting edge. This segmentation creates discrete cutting points and spaces between teeth that facilitate debris removal, transforming the continuous pulverization problem into a segmented cutting process.

Inventive Principle:

Principle #1Segmentation

2Weight of moving object

If a soft material shaft is used in the motorized stitch remover, then the shaft is lightweight, but it cannot absorb inertia force fluctuations causing motor damage

Engineering Contradiction:

Improveshaft weightVSAvoidmotor durability

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The shaft is constructed as a composite structure combining a hollow plastic inner shaft with an outer metal tube. The plastic provides lightweight properties while the metal layer provides the necessary strength and inertia absorption to protect the motor from damage during operation.

Inventive Principle:

Principle #40Composite materials

3Duration of action of stationary object

If a corded power source is used, then the motor has continuous power supply, but the device is limited to locations with power receptacles

Engineering Contradiction:

Improvepower supply continuityVSAvoidlocation flexibility

Core Design Contradiction:

Duration of action of stationary objectVSAdaptability or versatility

Solution Approach 1:

The corded electrical power system is replaced with a cordless battery-powered system. This substitution eliminates the physical constraint of power cords and receptacles, allowing the device to be used anywhere while the battery provides sufficient power for the motor to operate effectively.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Manufacturing precision

If a manual seam ripper is used, then one layer of stitches is cut at a time, but the operation is slow and requires significant operator energy

Engineering Contradiction:

Improvelayer precisionVSAvoidoperation speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The device performs the cutting action automatically through motor-driven blade movement. The operator simply guides the device along the fabric while the motor powers the blade to cut stitches, eliminating the need for manual cutting exertion and significantly increasing operation speed while maintaining layer precision.

Inventive Principle:

Principle #25Self-service

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

Enables efficient, debris-free removal of one layer of stitches without damaging the motor and provides portability by using a cordless power source, overcoming the limitations of prior art devices.

Implementation Method 1

a motor positioned within said body, said motor in communication with said blade

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a cordless power source positioned within said body, said cordless power source connected to said motor

Methodology Applied

Scientific EffectBattery (electricity): Battery (electricity)

Implementation Method 3

a soft material, such as plastic, is used for the shaft which does not adequately absorb the fluctuations in inertia force from cutting stitches of different densities

Methodology Applied

Scientific EffectInertia: Inertia

Data Source

PatentUS20060207099A1Cordless stitch removing device

Publication Date: 2006.09.21 MATHIS PEGGY

AI summary

The present invention provides a cordless device for removing a single layer of stitches from a fabric. The cordless device comprising a body having a top end and a bottom end. At the top end of the body is a blade having a plurality of upper teeth and a plurality of lower teeth for cutting the layer of stitches to be removed from the fabric. Inside of the body is a high powered motor for actuating the blade in a back and forth motion across the layer of stitches being cut. A cordless power source, such as a battery, is positioned inside the body to provide power to the motor.