Epilator Drive Unit Speed Control via Skin Contact Detection
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Solution Overview
Problem
Existing skin treatment apparatuses, such as epilators, generate excessive noise during hair removal, causing stress and psychological effects in users, and existing solutions either fail to adequately address noise reduction or increase production costs.
Innovation Solution
Incorporating a detector coupled to the control unit that adjusts the speed of the drive unit based on skin contact and resistance, allowing the apparatus to operate at low speed when not in contact with the skin and increasing speed only when necessary for efficient hair removal, thereby reducing noise and current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drive unit operates at high speed for efficient hair removal, then productivity is improved, but noise increases causing stress and psychological effects
Solution Approach 1:
The drive unit speed is made dynamic rather than fixed. The control unit adjusts the rotational speed of the plucking cylinder based on operational conditions - operating at low speed during movement/positioning and switching to high speed only when skin contact is detected for hair removal. This dynamic speed adjustment maintains productivity during treatment while minimizing noise during non-treatment phases.
Solution Approach 2:
A detector (skin contact sensor) provides feedback to the control unit about whether the plucking cylinder is in contact with skin. The control unit uses this feedback signal to automatically adjust the drive unit speed - maintaining low speed when no skin is detected and increasing to high speed when skin contact is confirmed, thus optimizing the balance between productivity and noise reduction.
2Productivity
If the drive unit operates continuously at high speed, then productivity is improved, but current consumption increases
Solution Approach 1:
The drive unit operates dynamically at two distinct speed levels. During movement and positioning phases, it operates at low speed consuming minimal current. Only when skin contact is detected does it switch to high speed for efficient hair removal. This dynamic operation significantly reduces average current consumption while maintaining productivity during actual treatment.
Solution Approach 2:
The drive unit alternates between low-speed idle mode and high-speed treatment mode based on periodic detection of skin contact. This periodic switching ensures the motor consumes high current only during brief intervals when actually removing hair, rather than continuously, thereby reducing overall energy consumption while maintaining treatment effectiveness.
3Object-affected harmful factors
If a detector and control unit are added to adjust speed, then noise and energy consumption are reduced, but device complexity increases
Solution Approach 1:
A skin contact detector provides automatic feedback to the control unit, eliminating the need for manual speed adjustment. The control unit receives the detector signal and automatically switches between speed modes, reducing noise and energy consumption without requiring complex user intervention or multiple manual controls.
Solution Approach 2:
The control system automatically adjusts drive unit speed based on detector feedback without user input. The apparatus self-regulates its operational mode - switching between low and high speed - based on whether skin contact is detected, thereby reducing noise and energy consumption autonomously without adding complex user interface elements.
Data Source
AI summary
A skin treatment apparatus, preferably an epilator, comprising at least one detector for detecting approximation and/or contact with the skin and a control unit to actuate the device depending on the signal received from the detector. The control unit has at least one regulator which increases the speed of the drive unit upon detection of an increased resistance and/or current consumption by a sensor and/or decreases the speed of the drive unit upon detection of an decreased resistance and/or current consumption by a sensor.