Rotary Reciprocating Mascara Applicator for Even Coating
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Solution Overview
Problem
Conventional mascara applicators, both manual and electric, face challenges in evenly applying mascara liquid without agglomeration and often suffer from uneven distribution and potential motor overload due to external pressure, leading to damage.
Innovation Solution
A rotary type linear reciprocating motion device and applicator that combines rotary and linear motion functions, featuring a driving part with a rotating and reciprocating mechanism, including a driving belt and eccentric cam, to ensure even application and prevent motor overload by idling the motor shaft under external pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the brush is rotated only by an electric motor without reciprocating motion, then the motor structure is simple, but the mascara liquid leans toward one side and agglomerates
Solution Approach 1:
The patent combines rotary motion and linear reciprocating motion into a single integrated mechanism. The cam mechanism converts the motor's rotary motion into both rotational and linear reciprocating movements of the brush, merging multiple motion functions into one unified system that ensures even mascara distribution without side-leaning or agglomeration.
2Productivity
If the brush is rotated at high speed to improve application efficiency, then productivity increases, but the motor is prone to overload when external pressure is applied
Solution Approach 1:
The patent implements a dynamic motion pattern where the brush performs high-speed rotary motion combined with linear reciprocating motion. The cam mechanism allows the brush to move forward and backward along its rotation path, creating a dynamic application process that maintains high productivity while reducing continuous motor load through periodic motion variations.
3Device complexity
If the brush performs only rotary motion, then the device structure is simple, but the user has difficulty in finely applying mascara to left/right sides of eyelashes
Solution Approach 1:
The patent adds a linear reciprocating dimension to the traditional rotary motion. The brush now moves not only rotationally but also linearly forward and backward along its rotation path, creating a two-dimensional motion pattern that enables precise control for fine application to left/right sides of eyelashes while maintaining relatively simple device structure.
4Productivity
If the brush is pressed closely to skin to ensure product application, then application effectiveness improves, but overload is applied to the electric motor causing damage
Solution Approach 1:
The patent employs periodic linear reciprocating motion combined with rotary motion. The brush periodically moves forward to apply product and then recoils backward, creating a rhythmic application pattern. This periodic action allows effective product application when pressed against skin while the recoil phase reduces continuous motor load, preventing overload and damage.
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 fine and even application of cosmetic products, preventing agglomeration and motor damage by simultaneously performing rotary and linear motions, allowing for precise application and reducing the risk of motor overload.
Implementation Method 1
a driving belt installed at an edge of the driving plate, the driving belt being in contact with a motor shaft of the motor to allow a driving force of the motor to be transferred to the driving plate by a frictional force
Implementation Method 2
a reciprocating part installed at the other surface of the driving part, the reciprocating part converting the rotational force of the driving part into a linear reciprocating motion force
Data Source
AI summary
A rotary type linear reciprocating motion device includes: a driving part rotatably driven by a motor; a rotating part installed at one surface of the driving part, the rotating part transferring a rotational force of the driving part to an applicator; and a reciprocating part installed at the other surface of the driving part, the reciprocating part converting the rotational force of the driving part into a linear reciprocating motion force, the reciprocating part transferring the linear reciprocating motion force to the applicator. The driving part includes: a driving plate having both surfaces at which the rotating part and the reciprocating part are respectively installed; and a driving belt installed at an edge of the driving plate, the driving belt being in contact with a motor shaft of the motor to allow a driving force of the motor to be transferred to the driving plate by a frictional force.