Tuft-Picking Device Notch Projections for X-Shaped Filaments
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Solution Overview
Problem
Current tuft-picking devices are unable to efficiently pick X-shaped filaments with depressions or recesses, leading to issues such as filament splicing, inconsistent picking, and loss of filaments, which prevents the proper formation of X-shaped filament tufts in toothbrushes, potentially causing sharp edges that can hurt the gums of users.
Innovation Solution
A tuft-picking device with a tuft picker featuring a notch with specific projections that adjust the opening width and depth, allowing for precise picking of filaments with recesses, including X-shaped filaments, by ensuring the second projection passes the filament container last during a working stroke, ensuring accurate and reliable filament selection without splicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tuft-picking devices are used, then round filaments with homogeneous surfaces can be picked efficiently, but X-shaped filaments with depressions or recesses cannot be picked reliably
Solution Approach 1:
The tuft-picking notch is designed with different local geometries including projections at specific positions and angles to match the specific shape characteristics of X-shaped filaments. The notch width, depth, and projection angles are locally optimized to engage with the recesses of X-shaped filaments while maintaining effectiveness for round filaments.
Solution Approach 2:
The tuft-picking notch incorporates asymmetric projections with specific angle ranges (10°-45°) relative to the working surface, creating an asymmetric geometry that specifically engages with the asymmetric X-shaped filament structure. This asymmetric design allows the notch to reliably pick X-shaped filaments while maintaining compatibility with round filaments.
2Adaptability or versatility
If the tuft-picking notch opening is made wider to accommodate X-shaped filaments, then more filament types can be picked, but picking precision and control are reduced
Solution Approach 1:
The notch geometry is locally optimized with specific width and depth dimensions, and projections positioned at precise locations. The projection angles (10°-45°) and distances (0.05-0.5mm) are locally tuned to provide precise control over filament engagement while accommodating X-shaped filament geometries.
Solution Approach 2:
The notch parameters including opening width, depth, and projection angles are specifically adjusted within defined ranges to optimize performance for X-shaped filaments. The projection distance from the working surface (0.05-0.5mm) and projection angles (10°-45°) are controlled parameters that enable precise picking while maintaining versatility.
3Device complexity
If conventional picking mechanisms are used, then the device structure remains simple, but filament splicing and inconsistent picking occur with X-shaped filaments
Solution Approach 1:
The tuft picker incorporates localized geometric features (projections at specific angles and positions) within the existing notch structure rather than requiring a complete structural redesign. This local modification approach maintains relative structural simplicity while significantly improving reliability for X-shaped filament picking.
Solution Approach 2:
Asymmetric projections are integrated into the tuft-picking notch geometry to specifically address the asymmetric nature of X-shaped filaments. This asymmetric design element is added to the existing structure to improve picking consistency without requiring complete structural overhaul.
Data Source
AI summary
A tuft-picking device for a brush-making machine includes a container for holding loose filaments with circumferences having at least one recess; and a tuft picker having a working surface having a notch. The notch has a depth, a width, and an opening. A contour of the working surface is movable during a working stroke past an open side of the container so that the opening passes the loose filaments. First and second projections reduce the opening versus an inner width. The first projection's top is located in the working surface of the tuft picker and the second projection's top is located off-site the working surface and inside the notch. The second projection passes the open side of the filament container last during a working stroke. A distance from the top of the second projection to the working surface is from 0.05 mm to 0.5 mm, and an angle between the working surface and a line of reflection symmetry crossing the top of the second projection is from 0.degree. to 45.degree..