Importance

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Abstract

A purpose is to improve movement characteristics of a linear extension and retraction mechanism. A robot arm mechanism includes a revolute joint and a linear extension and retraction joint. The linear extension and retraction joint includes a plurality of first connection pieces coupled together bendably on a bottom plate side and provided with a U-shaped cross section, and a plurality of second connection pieces coupled together bendably and each shaped like a flat plate. A foremost one of the plurality of second connection pieces is connected with a foremost one of the plurality of first connection pieces. The first and second connection pieces, when overlapped each other, form a columnar body by being constrained from bending. The columnar body is relaxed when the first and second connection pieces are separated from each other. An ejection section forms the columnar body by joining together the first and second connection pieces and supports the columnar body. A linear gear is formed on a surface of a bottom plate of each of the first connection pieces. A drive gear is engaged with the linear gears of the first connection pieces overlapped to the second connection pieces in the ejection section.

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First Claim