Method of dispensing pulverulent contents and apparatus for implementing this method

An apparatus for dispensing respectively predetermined quantities of pulverulent contents comprising,

• a rotatably drivable metering roller containing at least one metering chamber,
• a material store which stores pulverulent contents,
• a housing which has a concave surface region which is adapted to the convex surface shape of the metering roller such that, during its rotary movement, the metering roller butts tightly against the concave surface region of the housing,
• a device for introducing gas into the material store,
• a device for generating a positive gas pressure or a negative gas pressure in the metering chamber,
• wherein
• the metering roller contains at least one lateral line with two line ends, which is not line-connected to the metering chamber and of which at least the two line ends terminate on the surface of the metering roller and,
• a gas line guided into the housing and passing out of the housing again in the concave surface region, it being possible for gas to be introduced into the material store via the gas and the lateral line, in dependence on the respective rotary position of the metering roller,
• wherein in a first rotary position of the metering roller, the at least one metering chamber of the latter is line-connected to the material store and, in this position, each of the lateral lines present are simultaneously not line-connected either to the gas line or to the material store, with the result that the gas line is not line-connected to the material store.