Tamper stroke adjustment

Abstract

To provide a road finishing machine with tamper stroke adjustment means, and a method for a continuous tamper stroke adjustment at the road finishing machine.SOLUTION: The disclosure relates to a road finishing machine with a screed for producing a paving layer, where the screed includes at least one compacting unit (4) for precompacting paving material supplied to the screed. The compacting unit (4) includes at least one eccentric bushing (12) mounted on an eccentric shaft (8) rotatably supporting the same at a desired angle of rotation to continuously variably set a desired tamper stroke (11) of a tamper bar (6) of the compacting unit (4). For rotating the eccentric bushing (12), the compacting unit (4) includes at least one adjusting mechanism (10), where the adjusting mechanism (10) includes an adjusting drive mounted on the eccentric shaft (8) and rotatable along with the eccentric shaft (8).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a road finishing machine according to claim 1, and to a method for continuously adjusting the tamp stroke in a road finishing machine according to claim 15.

Background Art

[0002] EP 3 138 961 B1 discloses a road finishing machine in which the screed is provided with tamp stroke adjustment means. The tamp stroke adjustment means has an adjustment transmission provided between a rotatably drivable eccentric shaft and an eccentric bush rotatably provided on the eccentric shaft. The stroke of the tamper bar is set by the rotation of the eccentric bush on the eccentric shaft. EP 3 138 961 B1 further discloses an adjustment transmission provided between a rotatably drivable eccentric shaft and an eccentric bush non-rotatably provided on the eccentric shaft, where, in order to adjust the tamp stroke of the tamper bar, the eccentric bush moves across the adjustment transmission intersecting the eccentric shaft. Finally, EP 3 138 961 B1 discloses an adjustment transmission with a switching mechanism.

[0003] In the two first solutions described above, the adjustment of the eccentric stroke during operation of the road finishing machine is technically difficult. This is particularly because it is difficult to operate or actuate the adjustment transmission provided directly on the eccentric shaft between the eccentric bush and the eccentric shaft. The switching mechanism has a rather complex configuration and occupies a lot of space in the screed.

[0004] U.S. Patent No. 8,371,770 B1 discloses a screed having a tamper stroke adjustment means comprising a threaded rod and a threaded bushing movably mounted thereon. Axial adjustment of the threaded bushing along the threaded rod involves moving a lever arm provided on the threaded bushing, and the tamper stroke of the screed of the road finishing machine is set according to its position and orientation.

[0005] European Patent Application Publication No. 1 905 899 A2 discloses a screed for a road finishing machine equipped with a tamper stroke adjustment mechanism. The tamper stroke adjustment mechanism comprises a bearing support for an eccentric shaft, which is mounted horizontally and movable along a guide slide on which an eccentric bushing is mounted so as not to rotate relative to it. By horizontally displacing the bearing support, the distance between the eccentric shaft mounted thereon and an oblique shaft provided on the screed is manually adjustable, thereby achieving tamper stroke adjustment.

[0006] European Patent Application Publication No. 2 599 918 A1 discloses a method and apparatus for setting the top dead center of a stamper bar of a road finishing machine. European Patent Application Publication No. 2 599 919 A1 discloses a further apparatus for adjusting the stroke of a stamper bar of a road finishing machine. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The present invention aims to provide a road finishing machine equipped with a tamper stroke adjustment means and a method for continuously adjusting the tamper stroke in a road finishing machine, thereby enabling the tamper stroke to be set accurately and continuously, mainly during the paving work of the road finishing machine, using simple structural and technical means, and especially with a small number of modules in a compact design.

[0008] This objective is achieved by the road finishing machine described in claim 1, or by the method described in claim 15. Advantageous advances of the present invention are described in each of the lower claims.

[0009] The present invention relates to a road finishing machine having a screed for forming a paving layer, wherein the screed comprises at least one compaction unit for pre-compacting paving material supplied to the screed, the compaction unit comprising at least one eccentric bushing provided on the eccentric shaft, which is rotatably supported on an eccentric shaft at a desired angle of rotation, and which sets a desired tamper stroke of the tamper bar of the compaction unit to be continuously variable. The compaction unit comprises at least one adjustment mechanism for rotating the eccentric bushing, i.e., for adjusting the tamper stroke.

[0010] According to the present invention, the adjustment mechanism is provided on an eccentric shaft and includes an adjustment drive that rotates together with the eccentric shaft. In the present invention, the adjustment drive is directly located on the eccentric shaft, that is, the eccentric shaft is used as a support for the adjustment drive, resulting in a compact design for the compaction unit as a whole. This makes it possible to adjust the tamper stroke in the screed of a road finishing machine with fewer modules and less force.

[0011] In this invention, the eccentric bushing and the adjustment drive provided therefor are located together on the eccentric shaft. Therefore, they rotate together at the speed of the eccentric shaft during operation. The adjustment drive is capable of rotating the eccentric bushing relative to the eccentric shaft, that is, the rotation angle between these components is changeable, thereby allowing the tamper stroke to be set in accordance with the compaction unit.

[0012] The rotation of the eccentric bushing on a rotationally driven eccentric shaft (i.e., the degree of eccentricity of each of these two components relative to each other) is achieved by phase adjustment performed by an adjustment drive that itself rotates along the eccentric shaft, thereby enabling the setting of a desired tamper stroke in the screed. Phase adjustment can be actuated particularly advantageously at low speeds and with small forces by an adjustment drive that is mounted on the eccentric shaft so as not to rotate relative to it and rotates together with the speed of the eccentric shaft.

[0013] To set the rotational angle between the eccentric bushing and the eccentric shaft, the adjusting drive, which rotates together, is at least temporarily phase-adjustable so that, as seen from the outside, the speed of the supporting eccentric shaft is accelerated or decelerated, thereby causing the coupled eccentric bushing to rotate relative to the eccentric shaft. In other words, the eccentric bushing coupled to the adjusting drive and rotating together on the eccentric shaft can be "decelerated" or "accelerated" in response to the phase adjustment acted upon by the adjusting drive for the rotational motion of the eccentric shaft, thereby rotating the eccentric bushing to a new angular position relative to the eccentric shaft. The rotation of the eccentric bushing on the eccentric shaft makes the tamper stroke adjustable. Without individual operation of the adjusting drive rotating together on the eccentric shaft, the eccentric bushing rotates together with the eccentric bushing at the same speed as the eccentric bushing, i.e., with a constant tamper stroke.

[0014] The term "rotating together" means that the adjustment drive rotates together with the eccentric shaft due to its direct position on it. This allows the adjustment drive to be precisely phase-adjusted for the rotational motion of the eccentric shaft, particularly with a short adjustment passage and small force, i.e., structurally simple, in order to rotate the eccentric bushing. In other words, the change in the angular position of the eccentric bushing located on the eccentric shaft is actuated so as to change the tamper stroke of the tamper bar of the compaction unit.

[0015] Preferably, the adjustment mechanism comprises an adjustment transmission mounted on an eccentric shaft that can be driven by an adjustment drive. The adjustment transmission can be connected directly to an eccentric bushing or via a clutch. The adjustment transmission can be a separately mounted module connected to the adjustment drive, or it can be integrated and mounted on the adjustment drive.

[0016] It is advantageous for the regulating drive and regulating transmission to be a functional unit mounted on an eccentric shaft and rotating together with the rotational motion of the eccentric shaft. A functional unit that rotates together in this manner has a compact design and is optimally suited for tamper stroke adjustment on an eccentric shaft. The functional unit provided in this way can be positioned along the eccentric shaft, adjacent to the eccentric bushing, directly or at least at a very short distance, thereby improving the compact design. In particular, such a functional unit can be easily repaired without the need to remove the eccentric bushing from the eccentric shaft along the way.

[0017] In an advantageous embodiment, the adjustment mechanism, particularly the functional unit, described in the paragraph above is housed within a housing surrounding the eccentric shaft. This allows the adjustment mechanism to be integrated into the eccentric shaft without being bulky and to exist as a well-protected module, making it suitable for direct use in confined mounting spaces at tamper stroke adjustment sites. In particular, the housing protects the adjustment mechanism mounted on the eccentric shaft from asphalt vapors rising from the front of the screed, i.e., from the gaps between the lateral distributors.

[0018] For low-noise and low-wear operation, the housing is advantageous to be in the form of a hollow cylinder or ring. Preferably, a hollow cylindrical or annular housing is mounted on the eccentric shaft concentrically with its axis of rotation and unable to rotate relative to it. The housing can be designed in pairs so that it can be easily removed from the eccentric shaft to facilitate access to the adjustment mechanism housed inside.

[0019] In some modifications, the adjustment drive can be positioned centrally or eccentrically on an eccentric shaft. Preferably, the adjustment mechanism is connected directly to an eccentric bushing or by a positive-acting clutch.

[0020] In the present invention, the desired tamper stroke adjustment is preferably achieved as the sum of the individual eccentricities formed on the eccentric shaft and the individual eccentricities of the eccentric bushing provided on the eccentric shaft. For this purpose, the eccentric bushing can be rotatably positioned in the eccentric region of the eccentric shaft. Preferably, the adjustment drive is also mounted in the eccentric region of the eccentric shaft, i.e., the adjustment drive is positioned eccentrically in the eccentric region of the eccentric shaft so that it can be directly coupled to the eccentric bushing. This results in an extremely compact installation space.

[0021] In a modified configuration, the adjustment drive is located in the central region of the eccentric shaft (i.e., outside its eccentric region). In this central configuration, the adjustment drive can be connected by a positive-acting clutch (e.g., a meshing clutch) to an eccentric bushing offset in the eccentric region of the eccentric shaft. This effectively avoids imbalances in the adjustment drive and the rotational bearings of the eccentric shaft during rotation of the eccentric shaft.

[0022] Preferably, the adjustment drive can be operated hydraulically, electrically, and / or mechanically. Such a drive unit can be compact in design and optimally positioned directly on the eccentric shaft and at a short distance from the eccentric bushing.

[0023] The adjustment drive can have a substantially annular design. This allows the adjustment drive to be positioned concentrically with respect to the axis of rotation of the eccentric shaft. In other words, the adjustment drive can thus be mounted in a way that it is pressed against and surrounds the eccentric shaft, and positioned so as to be unable to rotate relative to it. Such an adjustment drive can be optimally positioned within a surrounding housing, especially if it has a substantially matching shape.

[0024] Preferably, the co-rotating adjustment drive is an electromechanical phase adjuster, such as a servo motor. This allows for operation with extremely high precision and rapid response, and the influence of other process quantities, such as unit temperature, is negligible. The adjustment drive may be a phase adjuster driven by a slip ring unit located on an eccentric shaft and / or by an induction unit attached to the eccentric shaft, with the phase adjustment set at the output.

[0025] An eccentric shaft adjustment drive, acting as a servo motor, may be equipped with a sensor to determine the position of the motor shaft. The rotational position of the motor shaft, i.e., the phase adjustment, determined by the sensor, is preferably transmitted in succession to control electronics, which control the movement of the servo motor corresponding to one or more adjustable desired tamper strokes in the control loop.

[0026] In one modification, the adjustment drive can be mounted on an eccentric shaft as a hydraulically actuated phase adjuster to which the pressure of a hydraulic fluid can be applied, and the desired phase adjustment is performed, for example, via the eccentric shaft, particularly through the hydraulic flow path implemented here, and sent to an eccentric bushing to set the rotation angle. A particularly compact design is achieved by having the eccentric shaft itself form the hydraulic supply line for the adjustment drive. Here, the hydraulic adjustment drive may be connected to a hydraulic system located on the screed.

[0027] Preferably, the clamping unit comprises a plurality of unit sections that can be set independently, and each of the adjustment mechanisms is provided in each of the unit sections. These can be implemented to operate independently so that different tampast strokes can be set in each of the unit sections. For each unit section related to each eccentric bushing rotatably provided on the eccentric shaft, it is conceivable to provide one adjustment mechanism where the adjustment drive is positioned on the eccentric shaft and rotates together.

[0028] It is conceivable that each of the eccentric bushings performs a desired rotation simultaneously on the eccentric shaft so that the same tampast stroke can be set for all unit sections. For example, for this purpose, in order to perform phase adjustment, all the adjustment mechanisms provided on the eccentric shaft can be operated simultaneously. Mechanical connection of a plurality of eccentric bushings can also be considered for this purpose.

[0029] It is advantageous for the adjustment mechanism to comprise at least one accumulator for the energy supply of the adjustment drive. The accumulator can be provided in the housing. Moreover, it is conceivable that the accumulator can be charged by the rotational movement of the eccentric shaft, for example by sliding contact and / or based on inductive charging. Thereby, the accumulator is surely made available for the adjustment drive as a fully charged energy storage. For an adjustment system that rotates together on the eccentric shaft, it is preferred that the accumulator substantially forms an annular unit provided on the eccentric shaft to rotate and optionally arranged in the housing like the adjustment drive.

[0030] Preferably, the adjustment mechanism related to the adjustment drive comprises at least one contact induction type power and / or signal transmission unit, for example a slip ring unit. This can be provided directly on the eccentric shaft, especially in a rotating housing. The slip ring unit is preferably implemented for bidirectional signal transmission that helps automate the adjustment mechanism.

[0031] In a preferred modification, the adjustment mechanism provides a non-contact power and / or signal transmission unit for an adjustment drive that rotates together on the eccentric shaft. For example, induction-based power and / or signal transmission is possible. The induction power and / or signal transmission unit can be mounted directly on the eccentric shaft. Here, bidirectional signal transmission capabilities are also advantageous for automated operation.

[0032] Regardless of whether the energy transfer is contact-inductive or non-contact, the regulating drive mounted on the eccentric shaft can be connected to the generator of the road finishing machine as a power consumer. As intermediate storage, the regulating mechanism can preferably have at least one accumulator located within the housing to buffer the regulating energy for the regulating drive, such as a servo motor, supplied by the generator.

[0033] In an advantageous modification, the adjustment mechanism for adjusting the desired tamper stroke is connected to a control system. The control system can receive the desired tamper stroke to be set from other control devices of the road finishing machine, or it can calculate it itself. The control system can be connected to the adjustment drive by a signal transmission unit. The other control device that provides the desired tamper stroke may be operably linked to the control system via a signal transmission unit located in the housing, i.e., rotating with the eccentric shaft. This further facilitates an integrated modular structure for the adjustment mechanism.

[0034] Preferably, the adjustment mechanism includes at least one sensor unit that detects a set rotation angle between the eccentric bushing and the eccentric shaft. The sensor unit can be an angle detection sensor directly fixed to the adjustment drive, such as a servo motor, thereby enabling measurement of the phase adjustment performed by the adjustment drive.

[0035] From the detected rotation angle, the actual tamper stroke can be calculated, particularly by the control system, which can then use this for comparison of differences. For dynamic adaptation of the actual tamper stroke, the control system may be equipped with control electronics, which allows for adjustment of the continuous tamper stroke.

[0036] In a particularly preferred modification, the control system comprises at least one control loop that responds to at least one process parameter detectable during the operation of the road finishing machine for dynamic adaptation of the rotation angle of the eccentric bushing. This control loop can adapt the rotation angle between the eccentric bushing and the eccentric shaft to produce optimal paving results, responding to intrinsic values ​​measured from, for example, the paving material of the road finishing machine and / or the laid paving layer. For example, intrinsic values ​​measured from the paving material are intrinsic values ​​relating to the paving material being laid, such as the measured temperature of the paving material transferred from the material bunker of the road finishing machine to the screed. For example, intrinsic values ​​measured from the paving layer are the measured temperature of the formed paving layer.

[0037] In a preferred embodiment of the present invention, the control loop can control the dynamic adjustment of the rotation angle between the eccentric bushing and the eccentric shaft in order to continuously adapt the tamper stroke in response to disturbing variable elements such as ambient temperature.

[0038] During the adjustment of the tamper stroke settings, individual construction vehicle measurements may be taken into consideration, such as the set angle of the screed, the paving speed of the road finishing machine, the set drive speed of the eccentric shaft, the temperature of the screed compaction plate, and / or measurements of the formed paving layer detected by a compaction vehicle moving behind the road finishing machine, for example.

[0039] According to one embodiment, the sensor unit of the adjustment mechanism may include at least one distance sensor implemented to directly measure the set actual tamper stroke of the tamper bar.

[0040] In one practical variation, the adjustment mechanism is manually adjustable. This can be particularly useful for calibrating the tamper bar at the start of paving operations. In contrast, automated operation of the adjustment mechanism is optimally suited to use during paving operations.

[0041] Furthermore, the present invention relates to a method for continuously adjusting a variable tamper stroke in a compaction unit of a road finishing machine, wherein at least one eccentric bushing is rotated on an eccentric shaft supporting it in order to adjust the tamper stroke. According to the present invention, an adjustment drive provided on the eccentric shaft and rotating together with the eccentric shaft is operated to rotate the eccentric bushing.

[0042] Because the adjustment drive itself is directly mounted on the eccentric shaft and connected so as not to rotate relative to it (i.e., it rotates at its own speed), it is possible to precisely perform the corresponding phase adjustment with little force in order to change the tamper stroke. Since the adjustment drive is connected so as not to rotate relative to the eccentric shaft, only a low speed and the corresponding small torque of the adjustment drive are required to perform the phase adjustment. Furthermore, the method according to the present invention offers the possibility of miniaturizing the components used for tamper stroke adjustment in the screed of a road finishing machine.

[0043] Advantageous embodiments of the present invention are illustrated in more detail below with reference to the drawings. The drawings are as follows. [Brief explanation of the drawing]

[0044] [Figure 1] Figure 1 shows a schematic side view of a road finishing machine. [Figure 2] Figure 2 shows the compaction unit related to the screed of a road finishing machine. [Figure 2A] Figure 2A shows a modified example of the embodiment shown in Figure 2. [Figure 2B] Figure 2B shows a further modification of the embodiment shown in Figure 2.

[0045] In drawings, identical components are always given the same reference numeral.

[0046] Figure 1 shows a road finishing machine 1 equipped with a screed 2 for forming a paving layer 3 in the paving movement direction R. The screed 2 has at least one compaction unit 4 for pre-compacting the paving material 5 supplied to the screed 2. The compaction unit 4 is equipped with a tamper bar 6 that can be driven with a variable tamper stroke H and / or a variable frequency F for pre-compacting the paving material 5 supplied to the screed 2.

[0047] Figure 2 shows an enlarged perspective view of the compaction unit 4. The compaction unit 4 has a bearing support 7 fixed to the screed body and an eccentric shaft 8 rotatably mounted thereon. The eccentric shaft 8 drives a connecting rod 9 to which the tamper bar 6 is fixed.

[0048] Figure 2 further shows an adjustment mechanism 10 positioned on the eccentric shaft 8 so as not to rotate relative to it, i.e., to rotate together with it. The adjustment mechanism 10 is actuated to set a movable desired tamper stroke 11 for the tamper bar 6. By actinguating the adjustment mechanism 10, an eccentric bushing 12, which is connected to and rotatably mounted on the eccentric shaft 8 and positioned adjacent to the adjustment mechanism 10 on the eccentric shaft 8, becomes rotatable.

[0049] Figure 2 further shows the state in which the adjustment mechanism 10 provides a housing 13 surrounding the eccentric shaft 8. In Figure 2, the housing 13 is in the form of a hollow cylinder and is positioned concentrically with respect to the eccentric shaft 8. The housing 13 is mounted so as not to rotate relative to the eccentric shaft 8, and in particular, it can be made of a signal-transmitting material so that the components housed inside can transmit and receive electrical signals well. The housing 13 can be mounted to house all the functional units of the adjustment mechanism 10.

[0050] Figure 2A shows a schematic diagram of the compaction unit 4 of Figure 2 relating to a first modified example. A drive 14, such as a hydraulic motor or electric motor, is provided to rotate the eccentric shaft 8. The adjustment mechanism 10 includes an adjustment drive 15 provided on the eccentric shaft 8 and rotating in conjunction with the speed of the eccentric shaft 8. The adjustment drive 15 is located in the eccentric region 16 of the eccentric shaft 8.

[0051] Furthermore, Figure 2A shows the adjustment drive 15 connected to the adjustment transmission 17. Through the adjustment transmission 17, the adjustment drive 15 is connected to the eccentric bushing 12, which is also located in the eccentric region 16 of the eccentric shaft 8. By operating the adjustment drive 15, it is possible to change the rotation angle φ of the eccentric bushing 12 located in the eccentric region 16, thereby setting the desired tamper stroke 11 of the tamper bar 6.

[0052] In Figure 2A, the control system 31 and power supply 18 are functionally connected to the eccentric shaft 8. Alternatively, or in addition to, the energy supply for the regulating drive 15 can also be achieved by an accumulator 30. The latter can be provided as the primary energy source or as an energy buffer between the power supply 18 and the regulating drive 15.

[0053] To detect the set rotation angle φ between the eccentric bushing 12 and the eccentric shaft 8, the adjustment drive 15 is equipped with a sensor unit 19. The control system 31 can be designed for signal transmission. Therefore, the control system 31 is implemented for transmitting signals to the adjustment drive 15, and further for receiving signals sent from the adjustment drive 15, for example, for receiving measurement signals from the sensor unit 19.

[0054] Power transmission and / or signal transmission can be performed by a power and / or signal transmission unit 20. This unit may exist as a sliding contact unit, or alternatively, as an induction unit.

[0055] Furthermore, Figure 2A shows that the desired tamper stroke 11 can be provided in the control system 31 so that the control system 31 can operate the adjustment drive 15 in correspondence via the signal transmission unit 20. Based on such operation, phase adjustment can be performed by the adjustment drive 15, which is transmitted to the eccentric bushing 12 via the adjustment transmission 17, thereby bringing about the desired rotation angle φ in the eccentric bushing 8.

[0056] In Figure 2A, since both the adjustment drive 15 and the eccentric bushing 12 are located in the eccentric region 16 of the eccentric shaft 8, the adjustment mechanism 10 is directly connected to the eccentric bushing 12.

[0057] Figure 2B shows an alternative modification of the adjustment mechanism 10. In this modification, the adjustment drive 15 is located in the central region 21 of the eccentric shaft 8. Furthermore, the adjustment mechanism 10 provides a positive-acting clutch 22. When the adjustment drive 15 is activated, an adjustment moment is transmitted to the eccentric bushing 12 via the adjustment transmission 17 by the positive-acting clutch 22, such as a meshing clutch, which causes a phase displacement in the eccentric shaft 8 and sets the desired tamper stroke 11.

Claims

1. A road surface finishing machine (1) having a screed (2) for forming a paving layer (3), The screed (2) is equipped with at least one compaction unit (4) for pre-compacting the paving material (5) supplied to the screed (2), The compaction unit (4) includes at least one eccentric bushing (12) provided on an eccentric shaft (8) that rotatably supports the tamper bar (6) of the compaction unit (4) at a desired rotation angle (φ) so that the desired tamper stroke (11) of the compaction unit (4) can be continuously changed, To rotate the eccentric bushing (12), the compaction unit (4) is equipped with at least one adjustment mechanism (10), The adjustment mechanism (10) is characterized by comprising an adjustment drive (15) provided on the eccentric shaft (8) and rotating together with the eccentric shaft (8), wherein the road surface finishing machine (1) is provided.

2. The road surface finishing machine according to claim 1, characterized in that the adjustment mechanism (10) comprises an adjustment transmission (17) provided on the eccentric shaft (8) and operable by the adjustment drive (15).

3. The road finishing machine according to claim 2, characterized in that the adjustment drive (15) and the adjustment transmission (17) are provided on the eccentric shaft (8) and are functional units that rotate together with the rotational movement of the eccentric shaft (8).

4. The road surface finishing machine according to any one of claims 1 to 3, characterized in that the adjustment mechanism (10) is arranged in a housing (13) surrounding the eccentric shaft (8).

5. The road surface finishing machine according to claim 4, characterized in that the housing (13) is in the form of a hollow cylinder or a ring.

6. The road finishing machine according to any one of claims 1 to 5, characterized in that the adjustment drive (15) is positioned in the center or eccentrically on the eccentric shaft (8).

7. The road finishing machine according to any one of claims 1 to 6, characterized in that the adjustment mechanism (10) is connected directly to the eccentric bushing (12) or by a positive-acting clutch (22).

8. The road finishing machine according to any one of claims 1 to 7, characterized in that the adjustment drive (15) is operable hydraulically, electrically and / or mechanically.

9. The road finishing machine according to any one of claims 1 to 8, characterized in that the compaction unit (4) comprises a plurality of independently adjustable unit sections, and each of the unit sections is provided with one adjustment mechanism (10).

10. The road finishing machine according to any one of claims 1 to 9, characterized in that the adjustment mechanism (10) comprises at least one accumulator (30) for supplying energy to the adjustment drive (15).

11. The road finishing machine according to any one of claims 1 to 10, characterized in that the adjustment mechanism (10) provides sliding inductive power and / or signal transmission for the adjustment drive (15).

12. The road finishing machine according to any one of claims 1 to 11, characterized in that the adjustment mechanism (10) provides non-contact power and / or signal transmission for the adjustment drive (15).

13. The road finishing machine according to any one of claims 1 to 12, characterized in that the adjustment mechanism (10) is connected to a control system (31) for setting the desired tamper stroke (11).

14. The road finishing machine according to any one of claims 1 to 13, characterized in that the adjustment mechanism (10) comprises at least one sensor unit (19) for detecting the rotation angle (φ) set between the eccentric bushing (12) and the eccentric shaft (8).

15. A method for continuously adjusting the tamper stroke in the compaction unit (4) of a road finishing machine (1), wherein, in order to adjust the tamper stroke (H), at least one eccentric bushing (12) is rotated on an eccentric shaft (8) that supports the eccentric bushing (12), A method characterized by operating an adjustment drive (15) provided on the eccentric shaft (8) and rotating together with the eccentric shaft (8) in order to rotate the eccentric bushing (12).

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