| 摘要 |
A ringing mechanism includes: a power source (12), a speed regulator (14), a ringing device, and a gear (10) connecting the power source (12) to the regulator (14) on the one hand and to the device on the other hand. The mechanism further includes a speed adjustor (16) and control element interacting with the speed adjustor (16) in order to change the driving speed of the ringing device.
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