Abstract: The machine is of the type which uses an energy beam which acts on a powder layer in a working zone. The machine has a device for layering said powder and which includes a means for storing powder, a means for distributing powder, a feeding means that transfers powder from the storage means to the distributing means, and a metering means that controls the quantity of powder transferred from storage means to distributing means. The storage means is positioned higher than the working zone, the feeding means utilizes gravity, and in use, the feeding means and the metering means move with the distributing means. The machine has two separate working zones and two separate working trays that move independently of one another. Each of the working trays is associated with only one working zone, and the layering device is common to both working zones.

Abstract: The tire has a tread with a tread surface and at least one groove which has a bottom wall and two lateral walls. At least one flexible wall is arranged in the groove in such a way that as liquid flows, the flexible wall flexes to allow the liquid to pass. After molding, the tire has a connecting element with a thickness which is equal to that of the bottom wall so that, after vulcanizing, the connecting element connects the lateral walls to the bottom wall over a given depth. The connecting element is then cut at its junction with each of the lateral walls of the groove so as to obtain the flexible wall.

Abstract: Method of manufacturing a tread of a tire made of rubber compound, the said tread comprising a tread surface, at least one groove having a bottom wall and two lateral walls extending from the bottom wall towards the tread surface, and at least one flexible wall arranged in the said groove in such a way as to be able to flex as liquid flows, the said method including molding the tread with at least one groove and at least one connecting element of a thickness equal to that of the wall which element is arranged inside the groove transversely to the longitudinal axis thereof, so that, after vulcanizing, the connecting element connects the lateral walls to the bottom wall over a given depth from the latter cutting the said connecting element at its junction with each of the lateral walls of the groove so as to obtain the flexible wall.

Abstract: acting on a powder layer in a working zone, containing a device for layering said powder, said device including: means for storing powder, means for distributing powder that travel over the working zone to distribute powder in a layer having a final thickness for additive manufacturing, feeding means that transfer powder from storage means to distributing means, metering means that control the quantity of powder transferred from storage means to distributing means, said machine being wherein: storage means are positioned higher than the working zone, feeding means utilize gravity, feeding means and the metering means move with the distributing means, the machine has two separate working zones and two separate working trays that move independently of one another, each of the working trays is associated with only one working zone, and the layering device is common to both working zones.