カムワルツ

noun

neck pinion

Technical term in horology (watchmaking) for a pinion that is part of the motion works, connecting the minute wheel to the hour wheel.

from German Kammwalze

• 時計とけいのカムワルツが摩ま耗もうすると、針はりの動うごきが不ふ正せい確かくになる。

  When the neck pinion of a watch wears out, the movement of the hands becomes inaccurate.