Patent ID: 7637728
Filing Date: 2009-12-29
Classification: B30B

Abstract:
1. A rotary tablet press, with a rotor driven by a driving motor, which has a die plate as well as an upper and a lower guiding for upper and lower punches, which co-operate with bores of the die plate, a stationary housing closely surrounding the rotor, which constitutes a pressing room, and with at least one ring-shaped sealing arrangement, which seals the housing against a punch guiding, wherein the sealing arrangement has a ring-shaped holder inside the housing, characterised in that the ring-shaped holder is axially movable between a first and a second position by means of a stationarily arranged lifting device ( 48 ), the sealing arrangement ( 26 , 28 ) has a first sealing portion, which is continuously in engagement with a first sealing surface of the housing ( 24 ) in the first and in the second position, and a second sealing portion which is in engagement with a second sealing surface ( 32 a ) of the punch guiding ( 12 ) with a first sealing force in the first position and is in engagement with the second sealing surface ( 32 a ) in the second position either with a second sealing force, which is smaller than the first sealing force, or is out of engagement with the same.