simplicity the machine 91 could be provided with a station for closing the capsules 3 which during the dosage phase of the first plate 4 operates said closing in a second plate 4 and with a station for the release of a plate 4 which has already gone through the closing station and finally with a final station in which a plate 4 with the capsules 3 still to be dosed is taken the machine 1 could be provided also with a station for compacting the powder 2 and or with a second dosage station possibly defined by a second machine 1 it is apparent that the aforedescribed considerations also apply to the other types of seats to be dosed for these the packing system may vary as for example for the blister sheet 6 on which there is applied a coating film the advantages of the present invention are apparent from the aforegoing description in particular there has been constructed a machine which as regards the amount can dose the powder with the utmost precision since it is provided with a dosage unit which is not subject to vibrations its motion being nonrotary the dosage precision is due also to the fact that the machine 1 is provided with only one dosage unit even though the dosage can be multiple therefore all that finishing of pinpoint accuracy for the levelling between the dosage units is not required the set of measurers 61 can be interchangeable by means of simple operations so as to make it possible to choose the number and the relative disposition of the measurers 61 the seats to be dosed can be widely varied as well as the type of conveyance of the latter it is.