Dual-Cam Gardening Trimmer Layout for Low Vibration Blades
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Solution Overview
Problem
Gardening trimmers experience vibration and noise due to the cyclic change in reaction forces from opposing blades, which existing designs fail to effectively mitigate.
Innovation Solution
The design incorporates a first and second cam member with eccentric cams that revolve around parallel axes, ensuring that reaction forces from one blade counteract those from the other, reducing vibration and noise by maintaining a positional relationship that stabilizes these forces regardless of cam member positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cam members with offset eccentric cams are used to drive opposing blades in opposite phases, then the blades can reciprocate effectively for trimming, but vibration and noise increase due to unbalanced reaction forces
Solution Approach 1:
The patent applies the counterweight principle by positioning the second eccentric cam opposite to the first eccentric cam with respect to the rotation axis. This arrangement creates counterbalancing reaction forces that offset each other, reducing vibration and noise while maintaining effective blade reciprocation for trimming operations
2Ease of operation
If the first and second eccentric cams are positioned offset from each other, then the blades reciprocate in opposite phases, but the cyclic change in reaction force positions causes vibration
Solution Approach 1:
The patent uses asymmetric positioning of the eccentric cams relative to the rotation axis, with the first and second eccentric cams placed opposite to each other. This asymmetric arrangement enables the blades to reciprocate in opposite phases while the opposing cam positions ensure that reaction forces remain balanced, maintaining vibration stability
Data Source
AI summary
A gardening trimmer may include: a first blade connected to a first cam member and configured to reciprocate in response to rotation of the first cam member; and a second com connected to a second cam member and configured to reciprocate in opposite phase to the first blade in response to rotation of the second cam member. The first cam member includes a first eccentric cam configured to revolve around a first rotation axis and is connected to the first blade at the first eccentric cam. The second cam member includes a second eccentric cam configured to revolve around a second rotation axis and is connected to the second blade at the second eccentric cam. Each of the first and second blades is configured to reciprocate along a plane including the first and second rotation axis.