A press device for manufacturing tablets from a powdery composition comprising at least one powder having elastic properties or thermofusible properties, comprising: - a turntable in which is arranged at least one die for receiving the powdery composition, - at least one compaction assembly comprising a first punch and a second punch, said first and second punches being laid out on either side of the turntable facing the die, and being mounted so as to be translationally mobile coaxially with the die, - first control means and second control means for controlling the axial displacement of the first punch and of the second punch respectively, said first and second control means comprising means co-operating for maintaining the first and second punches in a fixed axial position in which the first and second punches define a confinement volume with the die, wherein the first control means comprise a first compaction cam for displacing the first punch into the compaction position and the second control means comprise a second compaction cam for displacing the second punch into the compaction position, - said first compaction cam comprising a cam path on which said first punch is capable of being displaced, the cam path comprising a first planar portion perpendicular to the axis of the first punch, - said second compaction cam comprising a cam path on which said second punch is capable of being displaced, the cam path comprising a second planar portion perpendicular to the axis of the second punch, the second planar portion extending over an angular section at least equal to the angular section of the first planar portion of the first compaction cam for maintaining the second punch in said die at a fixed compaction axial position at least during said compaction-maintaining time, characterized in that the first planar portion extends over an angular section comprised between 5° and 170° for maintaining the first punch in the die at a fixed compaction axial position during a compaction-maintaining time comprised between 100 ms and 2500 ms, the second planar portion extending over an angular section at least equal to the angular section of the first planar portion of the first compaction cam for maintaining the second punch in said die at a fixed compaction axial position at least during said compaction-maintaining time, the first planar portion and the second planar portion being arranged relative to one another so as to maintain, during said compaction-maintaining time, the confinement volume at a constant volume corresponding to the compaction volume for forming the tablet, and in that the first punch comprises at least one bearing roller arranged so as to allow both rolling of the first punch on the cam path of the compaction cam according to the direction of rotation of the turntable and an axial displacement of said first punch, said bearing roller being laid out at one end of the first punch coaxially with the axis of said first punch, with a radial axis of rotation relatively to said first punch, and the first punch further comprising a guiding member extending radially relatively to said first punch, the first control means comprising at least one guide rail provided with a groove arranged for receiving said guiding member. - a turntable in which is arranged at least one die for receiving the powdery composition, - at least one compaction assembly comprising a first punch and a second punch, said first and second punches being laid out on either side of the turntable facing the die, and being mounted so as to be translationally mobile coaxially with the die, - first control means and second control means for controlling the axial displacement of the first punch and of the second punch respectively, said first and second control means comprising means co-operating for maintaining the first and second punches in a fixed axial position in which the first and second punches define a confinement volume with the die, - said first compaction cam comprising a cam path on which said first punch is capable of being displaced, the cam path comprising a first planar portion perpendicular to the axis of the first punch, - said second compaction cam comprising a cam path on which said second punch is capable of being displaced, the cam path comprising a second planar portion perpendicular to the axis of the second punch, the second planar portion extending over an angular section at least equal to the angular section of the first planar portion of the first compaction cam for maintaining the second punch in said die at a fixed compaction axial position at least during said compaction-maintaining time,