Buffered Cam Assembly for Accurate Follower Waveforms
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Solution Overview
Problem
Cam assemblies with irregular surfaces, particularly those produced using small-scale techniques like micro-machining or 3D printing, often result in inaccurate output waveforms due to deviations from the ideal contour, leading to issues like chatter, jitter, heat, and wear, especially in mechanical computing systems where precise waveforms are critical.
Innovation Solution
Introducing a buffer element between the cam surface and the follower to reduce deviations from the ideal contour by averaging or isolating irregularities, which can be flexible, rigid, or compressible, and is designed to stabilize against shear forces, thereby improving the accuracy of the output waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precise machining and polishing are used to create a smooth cam surface, then the accuracy of the output waveform is improved, but the expense and effort of fabrication increase
Solution Approach 1:
A buffer element is introduced as an intermediary component between the cam surface and the follower. This buffer absorbs and averages out the irregularities of the cam surface, allowing the use of less precise manufacturing methods for the cam while still achieving accurate follower motion. The buffer acts as a mediator that decouples the relationship between cam surface quality and output waveform accuracy.
Solution Approach 2:
The invention changes the physical state and properties of the interface between cam and follower by introducing a compressible buffer material. This buffer material deforms under load, changing the rigid contact into a compliant interaction that naturally filters high-frequency irregularities from the cam surface, thereby improving waveform accuracy without requiring ultra-precise cam manufacturing.
2Volume of moving object
If small-scale manufacturing techniques like micro-machining or 3D printing are used, then the minimum feature size and assembly size are reduced, but the accuracy of the output waveform deteriorates due to surface irregularities
Solution Approach 1:
The buffer element serves as a mediator that compensates for the inherent surface irregularities of additively manufactured or micro-machined cams. By placing this compliant layer between the cam and follower, small-scale manufacturing techniques can be used without sacrificing waveform accuracy, as the buffer absorbs the scale-dependent surface errors.
Solution Approach 2:
The invention employs composite construction by combining the cam (made via small-scale techniques) with a buffer element of different material properties. This composite interface allows the cam to be manufactured with less precision while the buffer material's inherent damping and compliance characteristics filter out the resulting irregularities, enabling accurate operation at small scales.
3Device complexity
If a rigid direct contact between cam and follower is used, then the structure is simple, but shear forces and irregularities cause chatter, jitter, heat, and wear
Solution Approach 1:
The invention changes the mechanical parameters of the cam-follower interface by introducing a compliant buffer material with specific elasticity and damping properties. This transforms the rigid contact into a controlled compliant contact that filters vibrations and irregularities, reducing chatter and jitter while managing shear forces through the buffer's deformation characteristics.
Solution Approach 2:
The buffer element provides beforehand cushioning by being pre-installed between the cam and follower surfaces. This cushioning layer is designed to absorb and dampen irregularities before they can propagate to the follower, preventing chatter, jitter, and excessive wear from occurring during operation.
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
The buffer element significantly reduces shear forces and irregularities, resulting in a more accurate and smooth output waveform, minimizing noise and vibrations, and extending the lifespan of the cam assembly by acting as a wear-resistant component.
Implementation Method 1
a buffer element interposed between the cam surface and a follower contact portion of the follower... The buffer element can be formed (either entirely or partially) of an elastic material and/or can be elastically mounted to the frame. The buffer element can be (either entirely or partially) compressible
Implementation Method 2
The buffer element can be formed (either entirely or partially) of an elastic material and/or can be elastically mounted to the frame
Data Source
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AI summary
A buffered cam assembly, which is particularly well-suited for use to provide a clock input for a mechanical computing system, interposes a buffer element between a cam surface and a follower. The buffer element engages the cam surface and acts to significantly reduce the effect of any irregularities in the cam surface on the resulting motion of the follower, allowing the output waveform of movement of the follower to more closely approximate an intended ideal output waveform.