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Flexural Pivots for Oscillatory Scanners
Published in Gerald F. Marshall, Glenn E. Stutz, Handbook of Optical and Laser Scanning, 2018
There is, however, a very interesting flexure pivot type whose design is due to the late Niels Young, and is illustrated in Figure 9.4. This pivot began life as a straight-line mechanism for a scanning Michaelson interferometer. The diaphragms, instead of being corrugated or plane, were pierced by a number of quasi-radial curved slots. These slots increased the axial compliance of the diaphragm considerably without materially decreasing the radial stiffness, or introducing a departure from the straight-line motion. It was discovered, however, that if two of these diaphragms were mounted to their separating pillar with the slots aligned, a small rotation of the pillar accompanied translation. This was, of course, undesirable in the application, so the diaphragms were mounted reversed with respect to each other, and the rotation was restrained thereby.
Prototyping of automated systems
Published in Fuewen Frank Liou, Rapid Prototyping and Engineering Applications, 2019
Linkages have many different functions, which can be classified according to the primary goal of the mechanism: (1) function generation—the relative motion between the links connected to the frame, (2) path generation—the path of a tracer point, and (3) motion generation—the motion of the coupler link. Examples of linkage mechanism include the straight line mechanism as shown in Figure 8.72 [Erdman01].
Design and static analysis of new deployable mechanisms based on the four-bar slider–crank mechanism
Published in Mechanics Based Design of Structures and Machines, 2022
Jianwei Sun, Song Gao, Wenrui Liu, Fanchen Kong, Xiaodong Li
From the analysis results above, consider the movement process of the mechanism where 0≤θ1≤90°. When θ1=0 and θ2=180°, the mechanism is in its initial configuration. AB, PC and the guide rail of the slider are located in the axis x; the shape of the mechanism is compact, and the path of the point P is a straight line at a single direction and does not cross any link, i.e., there is no interference. AB and PC are located in the axis y, where θ1=θ2=90°; compared with the initial configuration, the height of the mechanism’s shape increases, and the width remains the same. As a result, the configuration of the FBSCM is compact when in its initial folded configuration; the unfolded state, where θ1=θ2=90°, has a larger degree of compactness compared with the folded state, where 90°≤θ1≤0. Using Hoekens straight-line mechanism as a unit to compose deployable prism mechanism, the FBSCM with characteristics of straight-line motion can achieve dimensional changes in a single direction and can be used as a basic unit for designing deployable mechanisms.