To provide a general discharging machine for providing substantially perfectly smooth pulsation during operation.

A discharging machine for a compressible medium has a displacer 1 placed in a static housing. When the machine is operated the displacer 1 performs irrotational circular motion. Spiral bars 3, 3' are arranged vertically on a disk 2. The bar 3, 3' have outer sealing surfaces 30, 30' and inner sealing surfaces 31, 31', respectively. Starting ends 32 of the outer sealing surfaces 30, 30' are offset to starting ends 33 of the inner sealing surfaces 31, 31' in the cirmumferential view. Similarly, this also corresponds to finishing ends 34, 35 of the sealing surfaces. The bars 3, 3' engage with spiral feeding spaces in the housing, and during this machine's operation, the sealing surfaces 30, 30', 31, 31' together with cylindrical walls of the feeding spaces form an operation chamber in a constant rotational angle interval of a driving device.