| 摘要 |
<p>A damage-resistant mechanical-type metronome including a simplified spring driving connection to the pendulum and a simple adjustment, both of which at one and the same time minimize the likelihood of damage and also enable virtually complete elimination of "limp" or dissymmetry between the alternate half cycles. The device includes a shaft part, a pendulum part carried by the shaft part and adapted to undergo reciprocating movement about the axis thereof, powered means for oscillating the shaft part, and a yieldable drive in the form of a simple, one-layer spring, connecting the pendulum and shaft parts to effect concurrent movement thereof. A pair of arms is provided, one of which is rigid with respect to the shaft part and the other of which frictionally engages the pendulum part. The arms include free extremity portions which are disposed adjacent to one another and which lie between two opposite juxtaposed ends of the spring, The advantage of the present construction is that the second arm can be easily factory-adjusted to different positions with respect to the pendulum, whereby any slight dissymmetry in the half cycles of the metronome frequency can be eliminated by a simple and quick qualifying operation.</p> |
