Universal Sewing Machine Thread Trimming Device
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Solution Overview
Problem
Conventional sewing machines from different brands have incompatible actuation elements, making it impossible to share cutters, which limits the versatility of thread trimming across various sewing machine brands.
Innovation Solution
An automatic thread trimming device comprising a holding disc, cutter assembly, fixed cutter, and protective sheet, with flexible connection elements and an elastic extension, allowing the cutter assembly to be universally compatible with various sewing machines by using a drive bar and movable blade mechanism that cuts threads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cutting structures with brand-specific actuation elements are used, then the cutting mechanism can be actuated, but the cutters cannot be shared across different sewing machine brands
Solution Approach 1:
The holding disc is designed with a standardized structure that can accommodate different actuation elements from various sewing machine brands. The groove and connection portions are configured to universally interface with multiple actuation mechanisms, enabling a single cutter assembly to be compatible across different sewing machine brands while maintaining brand-specific actuation requirements
Solution Approach 2:
The cutting device is divided into modular components: the holding disc, cutter assembly, and actuation interface are separable. This segmentation allows the holding disc to serve as a universal adapter that can interface with different actuation elements while keeping the cutter assembly reusable across different sewing machine brands
2Force
If the movable blade is pressed firmly against the thread, then the cutting force is sufficient, but the blade cannot retract after cutting
Solution Approach 1:
The elastic extension provides dynamic, temporary pressing force to the movable blade during the cutting action. After the cutting stroke is completed, the elastic extension automatically releases the blade, allowing it to retract without requiring additional actuation. This dynamic pressing mechanism ensures sufficient cutting force during operation while enabling automatic retraction afterward
Solution Approach 2:
The elastic extension acts as a cushioning element that stores energy during the blade's forward motion and releases it after cutting. This beforehand cushioning ensures the blade maintains firm contact with the thread during cutting, then automatically rebounds to enable easy retraction without manual intervention
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 and universal thread trimming across different sewing machine brands, ensuring a clean cut and retracting the thread end for improved sewing product flatness, while allowing easy replacement of damaged blades.
Implementation Method 1
the flexible curved section has a flexible biasing segment formed on a distal end thereof and corresponding to the abutting section of the movable cutter, the movable blade is pressed longitudinally by using the abutting section and the flexible biasing segment of the elastic extension, such that the movable blade accumulates an elasticity to bounce away
Data Source
AI summary
An automatic thread trimming device of a sewing machine contains: a holding disc, a cutter assembly, a fixed cutter, and a protective sheet. The automatic thread trimming device further contains an abutting segment formed on a distal portion of a curved section of a front end of an elastic extension and corresponding to a contact zone of a movable cutter, such that the movable cutter moves to the fixed cutter horizontally to produce cutting force. In the meantime, a longitudinal thickness of a protrusion corresponding to a receiving orifice is 0.5 mm so that a short thread end is cut between a thread and a cut portion of the thread, and the short thread end retracts inward because of a woven fabric, thus obtaining a flatness of a sewing product. Preferably, the automatic thread trimming device is capable of being driven by drive elements of any sewing machines.