| 摘要 |
A beater assembly includes a first beater rotary shaft which is linked with a first operating shaft through a first link, and a second beater rotary shaft which is linked to a second operating shaft through a second link. The first and second beater rotary shafts are linked through a bearing which permits relative rotation between the first and second beater rotary shafts and those shafts are supported at the tops of supports on both sides of the beater assembly. A respective cam member is rotatably adjustably installed at one end of the first rotary shaft and the second rotary shaft and a spring is provided between each of the cam members and the lower part of the supports.
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