Abstract: A pneumatic single-grain sowing machine includes: a closed housing; a rotatably driven separating device, which has circularly arranged perforations; and a fan for producing a pressure difference between the housing and the interior of the separating device, the separating device thus being designed to separate seed by use of the perforations with the aid of the pressure difference, the separating device being designed as a closed hollow drum having two side walls arranged at a distance from each other. The separating device is designed to compensate slight housing expansions.

Abstract: A metering system of an agricultural machine comprises a separating housing, a separating device arranged in the separating housing, an associated seed storage chamber disposed on the separating side of the separating device in the distributor housing, a storage container which is associated directly with the seed storage chamber of the separating housing, a partition wall which is arranged between the storage container and the seed storage chamber, at least one seed passage opening which is arranged in the partition wall and the passage size of which can be adjusted by at least one adjustable slide element by way of at least one adjustment element.

Abstract: A pneumatic single-grain sowing machine includes: a closed housing; a rotatably driven separating device, which has circularly arranged perforations; and a fan for producing a pressure difference between the housing and the interior of the separating device, the separating device thus being designed to separate seed by use of the perforations with the aid of the pressure difference, the separating device being designed as a closed hollow drum having two side walls arranged at a distance from each other. The separating device is designed to compensate slight housing expansions.