Integrated Toothbrush Head Fixture for Precise Multi-Part Molding
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Solution Overview
Problem
The manufacturing process of toothbrush heads is complicated due to the need for multiple fixtures, leading to size differences and errors between components.
Innovation Solution
A brush head fixture is designed to include a fixture main body with a bristle accommodating part, material sealing surface, and positioning holes, allowing for the integration of bristles, retaining parts, and coating layers through injection molding, ensuring accurate size matching and simplifying the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fixtures are used to manufacture different components of a toothbrush head, then the manufacturing process can accommodate different components (bristles, retaining parts, coating layers), but the process becomes complicated and size errors occur between components
Solution Approach 1:
The patent combines multiple fixtures (bristle fixing fixture, retaining part injection molding fixture, coating layer injection molding fixture) into a single integrated fixture that can perform all three functions. The fixture includes a fixture body with a bristle accommodating cavity, positioning holes for retaining parts, and a material sealing surface for coating layer molding, eliminating the need for separate fixtures and reducing process complexity
Solution Approach 2:
The single fixture is designed to serve multiple purposes: it can fix bristles in the bristle accommodating cavity, mold retaining parts through positioning holes, and form coating layers through the material sealing surface. This multi-functional design allows one fixture to replace multiple specialized fixtures while maintaining the ability to manufacture different components
2Manufacturing precision
If multiple fixtures are used for different components, then each component can be manufactured separately, but size differences between fixtures and molds result in size errors between components
Solution Approach 1:
By merging multiple fixtures into one integrated fixture with unified positioning references and dimensional standards, the patent eliminates size differences that would occur between separate fixtures. The single fixture ensures consistent sizing relationships between bristles, retaining parts, and coating layers, improving manufacturing precision
3Productivity
If multiple fixtures and molds are used, then different components can be produced, but the manufacturing efficiency decreases due to process complexity
Solution Approach 1:
The integration of multiple fixtures into one eliminates the need for repeated setup, transfer, and alignment operations between separate fixtures. This reduces manufacturing steps and cycle time, improving productivity
Solution Approach 2:
The fixture allows bristles to be fixed and positioned in advance within the bristle accommodating cavity before the injection molding of retaining parts and coating layers. This preliminary positioning ensures that subsequent molding operations can proceed efficiently without additional alignment steps, improving overall manufacturing efficiency
Data Source
AI summary
Disclosed are a brush head fixture for production of a toothbrush head and a manufacturing method of the toothbrush head. The brush head fixture includes a fixture main body, a bristle accommodating part, a material sealing surface, and one or more positioning holes. The bristle accommodating part is configured for accommodating the free end of implanted bristles in the process of manufacturing the toothbrush head. The material sealing surface is located on one side of the fixture main body away from the bristle accommodating part and configured for preventing the material of the coating layer from entering the bristle accommodating part when forming the coating layer. The positioning hole penetrates through the wall of the fixture main body between the material sealing surface and the bristle accommodating part. The positioning hole is configured for injection molding the retaining part, and also for positioning the retaining part obtained through injection molding.