FIELD: machine building.;SUBSTANCE: invention relates to pneumatic percussion machines. Percussion machine includes a pneumatic cylinder body with openings on its upper and lower ends for communication of the housing cavity with the atmosphere in which a hollow piston is provided, provided with means for opening or closing the openings in the cover and the bottom of the piston during its movement. Upper and lower flaps adjoin the upper and lower ends of the pneumatic cylinder body, in which at least one through channel is coaxial with the holes for communication of the cavity of the case with the atmosphere.;EFFECT: as a result, expanded functionality.;1 cl, 6 dwg
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