Actuation Lever Mechanism for Shaving Head Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrically driven devices, such as dry shavers, are limited by the number of mechanical coupling elements, which restricts the flexibility in designing shaving heads with multiple cutting elements using a fixed number of driven shafts.
Innovation Solution
The use of a connecting lever to pivotably connect two actuation members, allowing a single or limited number of driven shafts to drive multiple cutting elements, enabling variable configurations of cutting elements in the shaving head while maintaining dynamic stiffness and adaptability to skin movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each actuation member has a respective coupling element (driven shaft), then the reliability of driving each cutting element is improved, but the device complexity increases and flexibility is reduced
Solution Approach 1:
The patent combines multiple actuation members onto a single driven shaft by providing seats on the driven shaft that receive actuation members directly or via connecting levers. This merging approach reduces the number of separate driven shafts needed while maintaining the ability to drive multiple cutting elements reliably, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The driven shaft is designed with multiple seats that can accommodate different types of actuation members (directly coupled or via connecting levers), making it a universal coupling element that can drive various cutting element configurations. This multi-functionality allows a single driven shaft to replace multiple specialized coupling elements.
2Productivity
If the number of cutting elements is increased, then the productivity of shaving is improved, but the device complexity increases due to requiring more coupling elements
Solution Approach 1:
Multiple cutting elements are driven by a single driven shaft through the use of multiple seats and optional connecting levers. This merging of drive functions allows the system to accommodate 2 or more cutting elements without proportionally increasing the number of driven shafts, thereby improving productivity while controlling device complexity.
Solution Approach 2:
The connecting levers are pivotably mounted to allow relative movements between actuation members while maintaining driven motion. This dynamic connection enables the system to accommodate different numbers and configurations of cutting elements flexibly, allowing productivity to be adjusted without rigidly increasing mechanical coupling complexity.
3Adaptability or versatility
If connecting levers are used to connect actuation members, then the adaptability to different cutting element configurations is improved, but the device complexity increases
Solution Approach 1:
Connecting levers are pivotably mounted between actuation members, allowing relative movements while transmitting driven motion. This dynamic pivotable connection provides adaptability for different cutting element configurations and skin movements without requiring complex rigid mechanical linkages, thus improving versatility while controlling structural complexity.
Solution Approach 2:
Connecting levers serve as intermediary elements between the driven shaft and actuation members, or between multiple actuation members. These intermediaries enable flexible force and motion transmission while accommodating relative movements, providing adaptability without directly increasing the complexity of the primary drive mechanism.
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
This solution allows for a range of cutting element configurations with a limited number of driven shafts, enhancing flexibility and adaptability, enabling efficient and precise shaving with reduced mechanical stress and improved user experience.
Implementation Method 1
the driven shaft is indirectly coupled to the drive shaft by means of a gear mechanism converting a rotary motion of the drive shaft into a reciprocating motion of the driven shaft
Implementation Method 2
The use of a connecting lever to pivotably connect two actuation members, allowing a single or limited number of driven shafts to drive multiple cutting elements
Data Source
Figure 1~4
Figure 5a~5b
AI summary
The invention relates to an electrically driven device comprising a housing (1), an application head (2) movably mounted on the housing (1), an electric motor mounted in the housing (1) and comprising a drive shaft having a first rotary axis (I), a driven shaft (3) for performing a movement relative to the housing (1), the driven shaft (3) extending at least partially within the application head (2), and a first actuation member (8) and a second actuation member (9), wherein the actuation members (8, 9) are movably guided in the application head (2) and wherein the first actuation member (8) comprises a seat receiving a portion of the driven shaft (3) for driving the first actuation member (8) in the first direction (D1). The driven shaft (3) is indirectly coupled to the drive shaft by means of a gear mechanism converting a rotary motion of the drive shaft into a reciprocating motion of the driven shaft (3) in a first direction (D1). The first actuation member (8) is coupled to the second actuation member (9) by means of a connecting lever (10) for driving the second actuation member (9) in the first direction (D1). The connecting lever (10) is pivotably mounted in the first actuation member (8) and is pivotably mounted in the second actuation member (9).