Jigsaw Vibration Reduction via Co-rotating Mass Offset
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Solution Overview
Problem
Existing hand-operated jigsaws are hindered by high weight due to counterbalancing masses and additional components, which also result in increased vibrations during operation.
Innovation Solution
The additional mass is positioned in a rotationally fixed manner with the eccentric wheel on the pivot bearing axis, offset at an angle between 190° and 270° from the mass center of gravity, eliminating the need for guiding means and allowing co-rotation to effectively counteract vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a counterbalancing mass with axially guided additional mass is provided, then vibration compensation is achieved, but the total weight increases and device complexity increases
Solution Approach 1:
The additional mass is merged with the eccentric wheel into a single rotating component. The additional mass is arranged in a rotationally fixed manner with the eccentric wheel on the pivot bearing axis, eliminating the need for separate guiding means and reducing overall weight while maintaining vibration compensation functionality
Solution Approach 2:
The invention transitions from an axially guided additional mass to a co-rotating additional mass that rotates with the eccentric wheel. This dynamic configuration allows the additional mass to effectively counterbalance vibrations in both vector directions through its rotational motion, achieving better vibration compensation with lower weight
2Object-affected harmful factors
If guiding means for axially guided additional mass are provided, then vibration compensation is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The additional mass is merged with the eccentric wheel into a single rotating component. The additional mass is arranged in a rotationally fixed manner with the eccentric wheel on the pivot bearing axis, eliminating the need for separate guiding means and reducing overall weight while maintaining vibration compensation functionality
Solution Approach 2:
The invention extracts and eliminates the complex axially guided additional mass and its guiding means from the system. By using a co-rotating additional mass fixed to the eccentric wheel, the patent removes unnecessary components while achieving effective vibration compensation
3Object-affected harmful factors
If the additional mass is offset at an angle of between 190° and 270° from the eccentric, then vibration compensation in both vector directions is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The invention optimizes the angular offset parameter of the additional mass to be between 190° and 270° from the eccentric. This specific angular range provides optimal vibration compensation in both vector directions. The patent specifies that the angle between the first radial and the second radial is advantageously between 195° and 225°, thereby further optimizing the compensation for the vibrations
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 configuration reduces the overall weight of the jigsaw while providing optimal vibration compensation in both vector directions, enhancing user experience and manufacturing efficiency.
Implementation Method 1
the additional mass itself can have a lower weight as compared to an axially guided additional mass, wherein, through the co-rotating additional mass which is offset at an angle from the eccentric, a maximum compensation for the vibrations in both vector directions of the plane spanning through the housing and the main hand grip is achieved
Data Source
AI summary
A hand-operated jigsaw is disclosed. The reciprocating drive mechanism has a reciprocating body which can be put into a reciprocating motion along an axis via an eccentric of an eccentric wheel that can be set in motion by the motor. The eccentric wheel is arranged on a pivot bearing axis. The reciprocating drive mechanism has an additional mass with a mass center of gravity to minimize vibrations. The additional mass is arranged in a rotationally fixed manner with the eccentric wheel on the pivot bearing axis. An eccentric axis of the eccentric lies on a first radial of the pivot bearing axis, which is offset from a second radial in the operating direction of rotation of the eccentric wheel at an angle of between 190° and 270°, which second radial lies between the mass center of gravity of the additional mass and the pivot bearing axis.