Variable Hair Length Module for Automated Doll Hair Rooting

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Solution Overview

Problem

Existing hair rooting machines lack the ability to efficiently adjust and produce hair strands of variable lengths automatically, limiting the versatility and realism in simulating human hair on dolls.

Innovation Solution

A hair rooting apparatus with a variable hair length module and control system that allows two arms to move relative to each other along continuous paths, enabling automatic adjustment of hair strand lengths between defined extreme lengths, and a control system to input programs for precise control of the relative movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional hair rooting machine is used, then the machine structure is simple, but the ability to adjust and produce hair strands of variable lengths automatically is lacking

Engineering Contradiction:
Improveability to adjust and produce hair strands of variable lengthsVSAvoidmachine structure
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a dynamic arm mechanism where the first and second arms can move relative to each other along continuous paths. This dynamic structure enables automatic adjustment of hair strand lengths by varying the relative positions of the arms, transforming a static machine into an adaptable system that can produce continuous variable lengths without manual intervention.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The control system serves as an intermediary that receives programming inputs and translates them into coordinated movements of the first and second arms. This intermediary component enables automatic control of the hair rooting process, allowing the machine to produce variable length hair strands based on programmed instructions without direct manual operation.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Productivity

If manual adjustment of hair length is used, then the machine structure is simple, but the productivity and realism of hair simulation are limited

Engineering Contradiction:
Improveautomatic production of variable length hair strandsVSAvoidautomatic control of arm movement
Core Design Contradiction:
ProductivityVSExtent of automation

Solution Approach 1:

The system enables self-service automation where the control system automatically coordinates the movement of both arms based on programmed instructions. The machine serves itself by automatically adjusting hair strand lengths and controlling the cutting process without requiring manual intervention for each adjustment, thereby increasing productivity while maintaining a reasonable level of automation.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The control system monitors and coordinates the positions and movements of the first and second arms, providing automated feedback control to ensure precise cutting at the desired hair length. This feedback mechanism allows the system to automatically maintain the correct relative positioning of arms throughout the hair rooting process.

Inventive Principle:
Principle #23Feedback

3Manufacturing precision

If fixed length hair strands are produced, then the manufacturing process is simple, but the realism and versatility of hair simulation are reduced

Engineering Contradiction:
Improvecontinuous variable length controlVSAvoidvariable length adjustment mechanism
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes the key parameter of hair strand length from a fixed value to a continuously variable parameter. By enabling the first and second arms to move relative to each other along continuous paths, the system can produce hair strands of any length within a defined range, transforming the manufacturing process from producing fixed-length strands to precisely controlling continuous variable lengths.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention adds a dimensional aspect to length control by using the relative movement dimension between the first and second arms. Instead of adjusting length through a single linear mechanism, the system utilizes the two-dimensional space and relative positioning of both arms, enabling continuous variable length adjustment through coordinated movement in multiple directions.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12569775B2Variable hair length apparatus for hair rooting
Publication Date: 2026.03.10 HASBRO TOYS SHENZHEN LTD
  • US12569775B2 patent drawing
  • US12569775B2 patent drawing
  • US12569775B2 patent drawing

AI summary

An apparatus includes: a variable hair length module configured to adjust the lengths of hair strands that are rooted in a head by a hair rooting machine from a supply of hair thread, the variable hair length module including two arms configured to move relative to each other along respective continuous paths; and a control system configured to input programs of instruction to the variable hair length module to automatically control the relative movement of the two arms during operation of the hair rooting machine to root hair strands into the head. The hair thread is configured to engage with each of the two arms such that a relative movement of the two arms varies the length of each hair strand continuously within a hair length range that is defined by two extreme lengths.