Vibration device with self-adjusting impact bars

A vibration device for a concrete block manufacturing machine for compression of a material to be compressed, wherein the vibration device comprises a vibrating table, a machine frame, at least one electric motor, a plurality of positioning devices, and at least one common drive unit, wherein the vibration device is at least partially resiliently mounted on the machine frame and driven by the at least one electric motor and as a result the vibrating table can be set in a predominantly vertical vibrating movement, wherein the vibration device has a plurality of vibrating table bars arranged parallel to one another and fastened to the vibrating table and impact bars fastened statically to the machine frame, wherein all the impact bars are displaceable relative to the vibrating table bars and along a displacement axis running parallel to the vertical vibrating movement by the plurality of positioning devices connected to one another and driven by the at least one common drive unit in order to obtain a displacement of all the impact bars,

• wherein the vibration device is adapted to adjust the surface of each impact bar by the plurality of positioning devices in an angle of inclination with respect to the horizontally oriented vibrating table bars.