Adjustable Fabric Circle Cutter with Retractable Blade
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Solution Overview
Problem
Existing fabric circle cutters either limit the user to a fixed circle size or cause fabric wrinkling due to multiple contact points, lacking adjustability and proper fabric tensioning.
Innovation Solution
A fabric circle cutter with an adjustable cutting radius, featuring a center pivot point and rotary blade that minimizes wrinkling by maintaining fabric tension and allowing for retraction of the pivot pin and blade for safety, utilizing a pivot pin assembly and blade assembly with spring mechanisms for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circular template made from rigid material is used as a guide, then the user can cut a circular swatch of fabric matching the shape and size of the template, but the user is limited to cutting only one size of circle equal to the template's radius
Solution Approach 1:
The patent transforms the static rigid template into a dynamic system with an adjustable arm that can be extended or retracted to different lengths. The arm connects the pivot point to the cutting blade, allowing the cutting radius to be dynamically adjusted by changing the arm's length, thereby enabling multiple circle sizes with a single device.
Solution Approach 2:
The cutting device is divided into separable components including the pivot point assembly, the adjustable arm, and the cutting blade assembly. This segmentation allows the arm to be independently adjusted in length and the blade to be independently positioned, providing flexibility in setting different cutting radii while maintaining device functionality.
2Adaptability or versatility
If a circle cutting device with a center axis pin and rotary blade is used, then various size circles can be cut limited only by the length of the arm, but the fabric can easily be wrinkled as the blade rotates around its center axis
Solution Approach 1:
The patent introduces a fabric support surface as an intermediary element between the cutting blade and the fabric. This support surface provides a stable base that prevents fabric wrinkling during cutting by distributing the fabric tension evenly across the cutting area, while the blade rotates around the pivot point to cut circles of various sizes.
Solution Approach 2:
The fabric is pre-positioned and secured to the support surface before the cutting operation begins. This preliminary action ensures the fabric is properly tensioned and flat on the support surface, preventing wrinkles from forming during the rotation of the cutting blade.
3Ease of operation
If the pivot pin and cutter blade remain exposed for easy access, then the device is convenient to use, but safety is compromised when cutting is not being made
Solution Approach 1:
The cutting blade is designed with dynamic positioning capability, allowing it to be extended into the cutting position during operation and retracted to a safe position when not in use. This dynamic adjustment enables the blade to be accessible when needed while minimizing safety hazards during storage or transport.
Solution Approach 2:
The cutting blade can be completely removed from the device when not in use, separating the sharp cutting element from the main body of the device. This extraction eliminates the safety hazard of an exposed blade during storage while allowing quick reattachment when cutting is needed.
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 the user to select any radius between the minimum and maximum, preventing fabric distortion and enhancing safety by ensuring the blade does not engage the fabric until in use, thus providing accurate and wrinkle-free circular cuts.
Implementation Method 1
a spring which maintains the pivot pin in an elevated position, preventing engagement with the fabric when not in use
Implementation Method 2
a spring-loaded cover that keeps the blade retracted and disengaged from the fabric during storage
Data Source
AI summary
A fabric circle cutter having a cutter base, a pivot pin assembly, and a blade assembly. The cutter base has a flat, smooth bottom surface with a turned up edge. The cutter base also has a raised base section which has a pivot point slide slot. The pivot pin assembly is slidably mounted on the raised base section and slidably mated with the pivot point slide slot which provides for selective positioning of the pivot pin assembly. The blade assembly has a rotary blade with a blade axis which is aligned approximately horizontally with and approximately parallel to the center line of the pivot point slide.