| 摘要 |
<p>Two toothed wheels (3,4) one of which is motor driven, engage and give alternate impulses to a rocker (5) by contact between wheel teeth (8,10) and rocker edges (41,42). The toothed wheels are also alternately blocked by separate and more widely spaced rocker projections (43,44). The rocker motion is transmitted to a balance wheel plate (2) by teeth (11,12,13) and rocker bounce is prevented by a tongue (45).</p> |
