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A tamping beam device of a paving screed, in particular of a road paver, is provided with a tamping beam arranged on a connecting rod, with a drive shaft connected to the connecting rod via an eccentric device, the eccentric device being configured such that a first and a second stroke adjustment po

A tamping beam device of a paving screed, in particular of a road paver, is provided with a tamping beam arranged on a connecting rod, with a drive shaft connected to the connecting rod via an eccentric device, the eccentric device being configured such that a first and a second stroke adjustment position of the connecting rod can be adjusted depending on the direction of rotation of the drive shaft. Stroke adjustment is effected via an eccentric device with a thrust member comprising an inclined sliding surface and with an eccentric ring and a slide guidance. A method for changing the stroke of a tamping beam includes changing the direction of rotation of the eccentric device.

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1. A tamping beam device of a paving screed with a tamping beam arranged on at least one connecting rod, with a drive shaft connected to the connecting rod via an eccentric device, the eccentric device being configured such that a first and a second stroke adjustment position of the tamping beam is

1. A tamping beam device of a paving screed with a tamping beam arranged on at least one connecting rod, with a drive shaft connected to the connecting rod via an eccentric device, the eccentric device being configured such that a first and a second stroke adjustment position of the tamping beam is adjusted depending on a direction of rotation of the drive shaft, wherein the eccentric device comprises:a thrust member which is displaced on the drive shaft in the axial direction by rotation of the drive shaft via a rotary thrust device having a contact geometry comprising a shape of a helical line, the thrust member comprising an inclined sliding surface on its outer circumferential surface which runs inclined relative to a rotation axis (B) of the drive shaft;an eccentric ring mounted on the connecting rod which comprises a receiving space for the thrust member with a slide guidance running on the inclined sliding surface,the receiving space being configured such that the thrust member is displaced between a first and a second stop position along the drive shaft in the axial direction of the drive shaft by rotation of the drive shaft in one or the other direction of rotation, thereby, via the inclined sliding surface, holding the eccentric ring in the first stroke adjustment position when in the first stop position, and holding the eccentric ring in the second stroke adjustment position when in the second stop position. 2. The tamping beam device according to claim 1, wherein the rotary thrust device comprises at least one of the following features:a rotary thrust gear;a thread extending coaxially to the rotation axis of the drive shaft;a catcher engaging a thread. 3. The tamping beam device according to claim 1, wherein the eccentric device comprises a sliding wedge transmission configured such that the eccentric device translates a displacement of the thrust member along the rotation axis of the drive shaft into a displacement of the eccentric ring in the radial direction. 4. The tamping beam device according to claim 1, wherein the thrust member and the eccentric ring are essentially locked against rotation relative to one another in the direction of rotation of the drive shaft via a guide device, and at the same time displaceable relative to one another along the drive shaft. 5. The tamping beam device according to claim 4, wherein the guide device comprises a groove extending in the axial direction and an engaging element engaging the groove, the groove being arranged on the thrust member and the engaging element being arranged on the eccentric ring or vice versa. 6. The tamping beam device according to claim 5, wherein the engaging element is a protrusion fixed to the thrust member said protrusion projecting from the outer jacket surface of the thrust member in the radial direction into the groove in the eccentric ring. 7. The tamping beam device according to claim 1, wherein the thrust member is a threaded sleeve with an inner thread engaging a threaded portion of the drive shaft. 8. The tamping beam device according to claim 1, wherein the inclined sliding surface of the thrust member is formed by the outer surface of the thrust member. 9. The tamping beam device according to claim 1, wherein the outer surface of the thrust member is configured to be cylindrical, in particular in the shape of an oblique cylinder, the axis of the cylinder (Z) extending in particular such that it intersects the rotation axis (B) of the drive shaft at an angle of 3° to 15°. 10. The tamping beam device according to claim 1, wherein the receiving space of the eccentric ring is formed as a cavity which is essentially complementary to the outer surface of the thrust member the cylinder axis extending coaxially to the cylinder axis (Z) of the thrust member. 11. The tamping beam device according to claim 1, wherein the receiving space is delimited in the axial direction of the drive shaft on both sides by stop walls provided separately from the eccentric ring. 12. The tamping beam device according to claim 1, wherein the eccentric ring, to its outer side in the radial direction, is rotatably supported in a connecting rod bearing. 13. A paving screed for a road paver with a tamping beam device according to claim 1. 14. A paving screed according to claim 13, wherein the paving screed comprises a tamping beam which is supported and driven by at least two of the tamping beam devices according to claim 1. 15. A road paver having a paving screed according to claim 1. 16. A method for changing the stroke of a tamping beam device, in particular according to claim 1, comprising the steps of: a) operating the tamping beam device in a first stroke adjustment position with the drive shaft rotating in a first direction of rotation;b) switching the direction of rotation of the drive shaft to a second direction of rotation opposite the first direction of rotation;c) displacing the thrust member on the drive shaft along the rotation axis of the drive shaft via the rotary thrust device;d) translating the movement of the thrust member along the drive shaft into a displacement movement of the eccentric ring in the radial direction to the direction of rotation of the drive shaft;e) stopping of the thrust member at an axial stop; andf) transferring the rotational movement of the drive shaft to the eccentric ring via the thrust member. 17. The method according to claim 16, wherein the tamping beam stands still during step c). 18. The tamping beam device according to claim 2, wherein the catcher comprises a catching pin. 19. The tamping beam device according to claim 1, wherein the outer surface of the thrust member is configured to be cylindrical, in particular in the shape of an oblique cylinder, the axis of the cylinder (Z) extending in particular such that it intersects the rotation axis (B) of the drive shaft at an angle of 5° to 10°. 20. The tamping beam device according to claim 1, wherein the outer surface of the thrust member is configured to be cylindrical, in particular in the shape of an oblique cylinder, the axis of the cylinder (Z) extending in particular such that it intersects the rotation axis (B) of the drive shaft at an angle of 7° to 9°.