| 摘要 |
It comprises a rotating disc (9) carrying pins (10) actuating vibrating blades (15a...15d; 16a...16e; 17a...17f; 18a...18e; 19...19d) fixed by their outer end to a support which is motionless with respect to the disc. The said vibrating blades are distributed around at least a part of the disc (9) into several sub-assemblies (15, 16, 17, 18, 19) each formed of vibrating blades with progressively staggered lengths. <IMAGE>
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