Fluid Product Dispenser with Cam-Actuated Switch for Precise Dosing
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Solution Overview
Problem
Existing dispensing devices for cosmetic and dermatological products in electrophoresis devices lack precise electronic control over the quantity of product dispensed, particularly in iontophoresis applications where electric current is applied simultaneously.
Innovation Solution
An electromechanical switch actuated by a cam controls the dispensing of a predefined product quantity, with an electronic restart circuit managing motor operation to ensure efficient and cost-effective dispensing, using a membrane pump actuated by a rotating shaft with angularly offset cams for precise product delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an electromechanical switch with cam actuation is used to control motor operation, then manufacturing cost and reliability are improved, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic control circuits with a simple electromechanical switch actuated by a cam mechanism. The cam, mounted on the motor shaft, mechanically opens or closes the circuit at specific rotational positions, eliminating the need for sophisticated electronic sensors and control logic while maintaining precise control over motor operation cycles.
Solution Approach 2:
The motor shaft itself serves dual purposes: it drives the pump and simultaneously actuates the electromechanical switch through the cam mechanism. This self-service approach allows the system to automatically control its own operation cycles without external intervention, reducing overall device complexity while improving reliability.
2Manufacturing precision
If a cam mechanism is used to actuate the switch and control motor duration, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The cam mechanism is pre-configured with specific geometric profiles that determine the exact timing and duration of motor operation. During manufacturing, the cam's shape is precisely engineered to ensure the motor runs for the correct duration corresponding to one complete pump cycle, thereby pre-establishing the dosing precision without requiring complex real-time control systems.
Solution Approach 2:
The cam mechanism converts continuous motor rotation into periodic on/off switching actions. As the cam rotates with the motor shaft, its profile periodically engages and disengages the electromechanical switch, creating regular operational cycles that ensure consistent, precise dosing with each motor actuation.
3Device complexity
If the switch is electrically connected in series with the motor, then device complexity is reduced, but control precision may worsen
Solution Approach 1:
The electromechanical switch acts as an intermediary component between the cam mechanism and the motor circuit. It precisely translates the mechanical position information from the cam into electrical on/off signals, ensuring accurate control of motor duration and operation cycles while maintaining a simple series circuit configuration without requiring complex control electronics.
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 reliable and economical dispensing of a predefined product quantity with each motor actuation, optimizing product application in electrophoresis treatments by reducing energy consumption and ensuring precise dosing.
Implementation Method 1
The switching device (14) is an electromechanical switch
Implementation Method 2
the stop control element is a cam arranged to press the switch
Implementation Method 3
The pump (5) comprises a membrane (6) which can be pressed and released
Implementation Method 4
an electric motor (10) which rotates around an axis (X) a shaft
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a device for dispensing a fluid product, comprising: a container (3) containing said product; an electric motor (10) comprising a rotatably driven shaft; a dispensing means (5) actuated by the rotation of the motor, the quantity of product dispensed depending on the rotation of the motor; a switching body (14) controlling the operation of the motor; a stop control element (11) rotatably driven by the shaft, assuming an active position during the rotation thereof in which it causes the switch (14) to interrupt the power supply of the motor; and a restarting circuit arranged in such a way as to switch into an activated state, when triggered, so as to force the starting of the motor when the stop control element (11) is in an active position, the restarting circuit remaining activated long enough for the stop control element to leave its active position, the restarting circuit then becoming inactive such that the motor stops operating when the stop control element regains its active position once the restarting circuit is inactive again.