Highest-order coupler points of Watt-1 linkages, tracing symmetrical six-bar curves

E.A. Dijksman

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Abstract

Certain non-symmetrical Watt-1 linkage meehanisms may produce symmetrical curves. The dimensions of the Watt-1 mechanism producing such a curve then have to meet five precise conditions. They have been derived from the two possibilities to symmetrize the Assembly Configuration containing the four six-bar curve cognates. Each possibility leads to a different mechanism. The one that can be driven without additional provisions, contains a kite four-bar,carrying rigid triangles that are similar and otherwise related.Then, a 'kite-cell , is involved,transforming the input-circle into a symmetrical Watt-1 curve of the 8th or of the 12th degree, depending on the choice of coupler-plane. The second possibility leads to a mechanism in which not only a point, but also a straight-line reaches the image positions. This type, however, must move through a 'stretched position' with a two-fold coupler motion. Then, gear-pairs or the like are necessary to overcome such a bifurcated position.
Original languageEnglish
Title of host publicationDET-colloquium, 13 februari 1980 te Enschede
Publication statusPublished - 1980

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