| 摘要 |
A tablet press machine ( 100 ) comprises: a hopper ( 1 ) for feeding a powder or granular product ( 2 ) to a first disc ( 3 a) that rotates about an axis (X) and is equipped with evenly distributed holes or dies ( 3 ); a second and third disc ( 4, 6 ) that are positioned above and below the first disc ( 3 a), respectively, rotate about the axis (X) and support respective pluralities of upper and lower reciprocating punches ( 5,7 ). The punches ( 5, 7 ) are driven towards and away from each other when they are aligned with the dies ( 3 ) in such a way as to compress the product ( 2 ). Each of the punches ( 5, 7 ) comprises a cylindrical shank ( 8 ), one end of which is equipped with a working head ( 10 ) and sealed protection means ( 11 ) acting on the cylindrical shank ( 8 ) itself. The sealed protection means ( 11 ) comprise, for each punch ( 5, 7 ), a concertinaed sleeve ( 12 ) covering the cylindrical shank ( 8 ) and having an annular portion ( 13 ) constituting its far end relative to the working head ( 10 ), forming an annular seal and providing also a removable element used to attach support means ( 14 ) that protrude from the respective disc ( 4, 6 ). The near end ( 15 ) of each concertinaed sleeve ( 12 ) relative to the working head ( 10 ) presents an enlarged annular portion ( 16 ) that engages with a matching annular groove ( 17 ) in the cylindrical shank ( 8 ) to provide a tight seal.
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