The invention relates to a tamper device (40) for a screed (18) of a working machine, in particular a paver (10). The device (40) comprises a rotatable driveable tamper shaft (46) with an eccentric section (47), an eccentric bushing (48) mounted on the eccentric section (47), and a connecting rod (50) rotatable mounted on the eccentric bushing (48) for being driveable with stroke motions having a stroke (S), the stroke (S) being adjustable by an rotational adjustment of a relative rotational positioning between the eccentric bushing (48) and the eccentric section (47). The device (40) further comprises an inner-toothed hollow wheel gear train (60) for providing the rotational adjustment. The gear train (60) is connected to the tamper shaft (46), to the eccentric bushing (48 ), and to a drive force receiving element (70) configured to be able to receive a drive force for driving the inner- toothed hollow wheel gear train (60) when the tamper shaft (46) is rotating.
展开▼