Funding order

Abstract

Conveyor arrangement (1), comprising an end-point chute (11, 12,...), installed - for the transfer of a conveyed item (9), in particular a postal parcel (9), at a transfer area (A1), in particular from an upstream feeding device (7) - for the transfer of the conveyed goods (9) at a transfer area (A3), in particular at a terminal (4); - for transferring the conveyed material (9) in a chute area (A2) from the receiving area (A1) to the transfer area (A3), wherein the end chute is inclined downwards in the conveying direction (F) so that the conveyed material (9) is transported sliding due to gravity, in particular comprehensive means to reduce damage to the conveyed goods.

Description

[0001] The invention relates to a conveying arrangement.

[0002] At the terminals of a parcel distribution center, parcels are loaded into delivery vans or trolleys assigned to specific destination regions. A sorter, such as a cross-belt sorter (e.g., WO 2019 / 002048 A1), then feeds the parcels to their respective terminals. To overcome differences in elevation, inclined chutes are used between the sorter and the terminal, allowing the parcels to slide down them due to gravity. This can lead to damage to the parcels. Furthermore, parcel jams frequently occur, which can put pressure on parcels at the bottom and damage them as a result.

[0003] EP 1 868 923 B1 discloses an end-point chute with two rollers running transversely to the conveying direction of the chute and driven in the conveying direction. The speed of one roller is higher relative to the other the closer the respective roller is to the exit side.

[0004] DE 10 2019 119 696 A1 discloses a conveying device for converting a serially transported stream of general cargo into a parallel transported stream of general cargo.

[0005] German patent DE 10 2010 005 267 A1 discloses a unit load distribution system with an automatic sorting system. It includes a manual distribution area and a conveyor system. The conveyor system has a conveyor head with a receiving area for manually placing unit loads. The conveyor head can be moved within the system.

[0006] DE 197 19 748 C2 discloses a device for handling packages for loading and unloading a cargo space in which the packages are stacked on top of each other.

[0007] EP 2 922 775 B1 discloses a brake roller based on magnetic eddy currents. This brake can slow down a conveyed material, but cannot hold it at a standstill.

[0008] The object of the present invention is to provide an improved conveying arrangement. This is achieved by a device according to the main claims; embodiments are the subject of the dependent claims and the description.

[0009] The invention aims to reduce the risks of damage to conveyed goods in the vicinity of the final destination through targeted improvements.

[0010] The invention is characterized by various measures to prevent congestion in connection with the end-point chutes.

[0011] The invention is particularly suited for conveying postal parcels and / or polybags. Polybags are goods packaged in film without a rigid outer contour.

[0012] A suitable conveying item, in particular a postal parcel, weighs 20 kg, although this does not preclude the use of lighter or heavier parcels. Specifically, the conveying system is designed to handle a conveying item, particularly a postal parcel, weighing 50 kg. It may also be possible to convey so-called polybags, i.e., goods packaged in a film, such as clothing.

[0013] An end point is an area where the conveyed goods are stored, at least temporarily, in order to be transported from there, for example, into a delivery van.

[0014] The invention is explained in more detail below with reference to the figures; here, the following are shown: Fig. 1 schematically depicts the structure of a design of the conveyor arrangement in side view; Fig. 2 schematically depicts the structure of a design of the conveyor arrangement in top view; Fig. 3 schematically depicts the structure of a design of the conveyor arrangement in top view; Fig. 4 schematically shows the structure of a design of the conveyor arrangement in top view; Fig. 5 schematically depicts the structure of a design of the conveyor arrangement in top view; Fig. 6 schematically shows the structure of a design of the conveying arrangement in different views; Fig. 7 schematically shows the structure of a design of the conveyor arrangement in side view; Fig. 8 schematically shows the structure of a design of the conveyor arrangement in side view; Fig. 9 schematically shows the structure of a design of the conveyor arrangement in side view; Fig. 10 schematically depicts the structure of a design of the conveyor arrangement in side view; Fig. 11 schematically the tumble lock of the conveyor arrangement according to Fig. 10 in perspective view in different positions; Fig. 12 details of the tumbling block after Fig. 11 in side view.

[0015] The Fig. 1 and Fig. Figure 2 shows a conveying arrangement 1 according to the invention. A conveyed item 9, for example a postal parcel, is conveyed by a sorter 7 with a plurality of sorting carriages 71. From the sorter 7, the conveyed item 9 reaches a terminal 4 via a selected chute from a plurality of chutes 11-19. At the terminal 4, the conveyed item is stored, at least temporarily, before being transferred from there into a delivery van 8.

[0016] Each chute comprises a receiving area A1, followed by a chute section A2. In chute section A2, the conveyed material 9 slides downwards, at least in sections, to reach a transfer area A3. Rigid side guides 51 ensure that the conveyed material 9 reaches the end point. In chute section A2, significant height differences are overcome. Due to space optimization, chute section A2 is therefore very steep, resulting in high acceleration of the conveyed material 9. This could lead to damage to the conveyed material, especially upon impact at the end point 4. Furthermore, for space reasons, the end points 4 are positioned close together, limiting the width of each end point chute 11-19. This can lead to blockages, particularly at the receiving area A1, as shown for chute 18. The receiving area A1 may have a narrowing in the conveying direction F of the chute.

[0017] Not shown in the figures is the possibility of a braking belt being provided in the chute area. The braking belt is designed to slow down conveyed material sliding down at high speed. For this purpose, the braking belt includes a conveyor belt that operates at a low speed in the conveying direction.

[0018] Fig. Figure 3 shows, as an excerpt, details of a further training course under funding order 1. Fig. 1. A movable side guide 52 is provided, particularly at the receiving area A1. The movable side guide allows the width of the chute to be adjusted, at least in sections, especially at receiving area A1, to the size of the package currently being received. The movement can be achieved by pivoting or shifting. The movement is effected by an actuator 52A.

[0019] Fig. Figure 4 shows, as an excerpt, details of a further training course under funding order 1. Fig. 1. In the receiving area A1, the side guide 51 includes a sliding cushion element 53. This sliding cushion element 53 prevents or reduces damage to a package impacting the side guide. The sliding cushion element 53 is located on the right side of the Fig. Figure 4 is shown enlarged. It comprises one or more cushioning elements 531. For example, cushioning chips, which are commonly used for the internal padding of packages containing fragile items, can be used. However, such cushioning elements usually have an unfavorable coefficient of friction. Therefore, the cushioning elements are enclosed with a sliding film 532. The sliding film 532 has a lower coefficient of friction than the cushioning elements. In addition, the sliding film allows mechanical impacts from the package to pass through to the cushioning elements without being damaged. Such sliding cushioning elements are known from indoor climbing playgrounds to protect playing children from the hard climbing frame.

[0020] Fig. Figure 5 shows, as an excerpt, details of a further training course under funding order 1. Fig. 1. Similar to Fig. Section 4 provides a damping-acting lateral guide. The lateral guide 54 is movable with damping properties. For this purpose, the lateral guide 54 is flexibly mounted by means of a spring damper assembly 541. If a package strikes the lateral guide 54, the lateral guide can move away in the direction of impact. The spring damper assembly 541 decelerates the movement and returns the lateral guide to its original position.

[0021] The Fig. 6a and Fig. Section 6b shows details of a further training course according to funding order 1. Fig. 1. Two adjacent end chutes 11 and 12 each have different minimum widths B. The minimum width B is the smallest width of each chute, thus defining the maximum package size that can pass through the respective end chute. For example, the minimum width B of the first, wider end chute 11 is 1 m; the minimum width B of the second, narrower end chute 12 is 0.5 m. Both end chutes 11 and 12 can each lead into the same end point 4.

[0022] The sorter is programmed in such a way that it diverts packages to the respective terminals depending on the package size, provided that the two terminal chutes 11, 12 are each connected to the same sorter at the transfer section A1.

[0023] In a further development, the two end-point chutes 11, 12, at the transfer section A1 are each connected to different feeding devices 7, in particular to different sorters 7. In the present example, the first end-point chute 11 is connected to a first sorter 7a, which is intended in particular for sorting larger packages; the second end-point chute 12 is connected to a second sorter 7b, which is designed in particular for sorting smaller packages.

[0024] The funding arrangement can, as Fig. Figure 6c shows a pre-sorting station 75 which, based on the size of each package, selectively directs it to one of the sorters 7a or 7b. A package size determiner 76, for example a camera with associated image analysis, is provided to determine the size of a package. The pre-sorter is configured to selectively direct the packages to one of the sorters 7a or 7b based on the determined size.

[0025] Fig. Figure 7 shows a package 9 that has started to tumble. During the tumble, the package rotates on its own axis. It rolls instead of just sliding. Due to the lack of sliding friction, the package accelerates rapidly and can therefore hit the endpoint 4 at an increased speed.

[0026] The conveyor system now includes a tumble detection system (60). There are different detection methods available.

[0027] In one possibility, the end-of-line chute is monitored and analyzed using a camera 61. The visual appearance is characterized by rapid changes in the package's view; in particular, the visible frontal area changes frequently, depending on whether the package is aligned parallel to or obliquely to the camera 61's viewing direction. With a sliding package, the visual appearance changes significantly more slowly.

[0028] Alternatively, the end chute can be monitored using a microphone. The microphone records a sound profile at the end chute. In particular, a tumbling package produces discrete knocking sounds when it hits a surface with one edge.

[0029] The images and sound profiles are evaluated by a control system.

[0030] The control system 63 can be formed by a self-learning system. For this purpose, films or sound profiles of a large number of moving packets were read in and compared with a manual evaluation.

[0031] If the tumbling detection system 60 detects a tumbling package, a tumbling barrier 64 is activated. The tumbling barrier 64 is capable of at least slowing down or stopping the tumbling package. In this case, the tumbling barrier 64a is a wall that, in its normal state, is located outside the sliding area of ​​the end chute (solid line). An actuator 65 activates the tumbling barrier 64a and moves it into the sliding area of ​​the end chute (dashed line). The tumbling package is at least slowed down or even stopped by the tumbling barrier 64a. The tumbling barrier can then be lowered again, and the package can slide to the end point.

[0032] The chute barrier can also serve as a backflow preventer. If the end point is filled with packages, a backup can occur in the chute section. The greater this backup, the greater the pressure load on packages below, which can lead to damage. Such a backflow preventer supports packages above, so that packages above the barrier exert no or only reduced pressure on packages below.

[0033] In an alternative embodiment, the tumbling barrier is a safety net 64b that drops down as needed. In another embodiment, the tumbling barrier is an airbag that is filled with air as needed. The control mechanism via the tumbling detection 60 remains fundamentally unchanged.

[0034] In the design according to Fig. Figure 8 shows that the endpoint 4 is already filled with a large number of packages. Subsequent packages are at risk of remaining in chute area A2 and not being able to slide down. This is particularly disadvantageous if the endpoint includes a wire mesh container that is removed after being filled. The design according to Fig. The conveyor section 70 now features a direction-changing conveying section 70 in the chute area. The core component of the direction-changing conveying section 70 is a position-adjustable conveying surface 71, which can be moved between at least two positions by means of an actuator 72. In a first position (solid line), the packages can be deposited on a lower level at the terminal. In a second position, the packages can be deposited on an upper level at the terminal 4, for example, on top of previously deposited packages. The inclination of the position-adjustable conveying surface 71 can be adjusted accordingly.

[0035] The position-changing conveying surface can be formed by a chute or the top of a belt conveyor, in particular a brake belt.

[0036] The control of the direction-changing conveyor section, the position-changing conveyor surface, or the actuator is carried out by a controller. The controller uses the signals from an occupancy sensor 73. The occupancy sensor 73 can be a camera with corresponding image processing. Alternatively, the occupancy sensor 73 can be a light barrier or a light switch.

[0037] Fig. Figure 8 shows a further solution to the problem mentioned. For this purpose, the terminal 4 itself is height-adjustable. An actuator 73 allows the terminal to be adjusted in height, in particular lowered, if the occupancy detection system determines that the terminal is filled with a large number of packages.

[0038] Fig. Figure 9 shows another solution. A brake slide assembly 80 is provided above the chutes. The brake slide assembly comprises several brake slides 82 arranged circumferentially on a brake slide guide 83. The brake slides are operated such that at least one brake slide is moved at least sectionally above the chute in the conveying direction in front of and / or behind a conveyed material 9. The brake slide 82 acts as a brake on the conveyed material 9 if the conveyed material slides too fast (see conveyed material 9a). The brake slide 82 acts as an accelerator on the conveyed material if the conveyed material slides too slowly (see conveyed material 9b). A drive 81 is provided to power the circumferential movement of the brake slides.

[0039] Essentially, the brake slide fulfills a similar function to a brake band (see still unpublished DE 10 2021 106 255.1), which operates at a constant speed. Due to the positive-locking interaction between the conveyed material and the brake slide, which is suspended above the chute, tumbling materials can be gently caught or even prevented from tumbling altogether.

[0040] Tumbling refers to a translational movement of the conveyed material in the conveying direction, accompanied by a rotational movement. This rotational movement occurs around the tumbling axis, which is oriented approximately horizontally and perpendicular to the conveying direction. In other words, during tumbling, the conveyed material also undergoes a rolling motion.

[0041] Fig. Figure 10 shows another solution. The slide area A2 is divided into several sub-slide areas A2a, A2b, A2c by means of several, here three as an example, tumbling barriers 64a, 64b, 64c arranged one behind the other. One of the tumbling barriers 64a, 64b, 64c is arranged downstream of each of the sub-slide areas A2a, A2b, A2c.

[0042] The tumbling stops 64 can be selectively moved between an open and a closed position. A conveyed item 9 can only pass from the upstream partial chute section A2a, A2b, A2c to the respective downstream section, namely the downstream partial chute section A2b, A2c or the transfer section A3, if the respective tumbling stop is in its open position. In the closed position, the conveyed item is held in the respective partial chute section.

[0043] In each of the partial slide areas A1a,b,c, an occupancy sensor 66a,b,c is assigned, which is used to determine whether there is a conveyed material present in the respective partial slide area or not.

[0044] The tumble stop devices are used as follows. By default, the tumble stop devices are in their closed position. When the first conveyed item 9a enters the first partial chute section A2a from the transfer area A1, the first conveyed item 9a is inevitably stopped by the first tumble stop device ( Fig. 10a). Should the first conveyed item have started to tumble, the tumbling will be prevented by the first tumble barrier 64a.

[0045] After the first conveyed item 9a has been stopped by the first tumbler barrier 64a, the first tumbler barrier 64a can be moved to its open position so that the first conveyed item can enter the second partial chute section A2b. However, the second conveyed item 9b is present in the second partial chute section A2b. In this case, the first tumbler barrier 64a is not moved to its open position until no conveyed item is present in the second partial chute section A2b. Fig. 10b). This is determined using the second occupancy sensor 66b.

[0046] The same procedure is followed at the second tumbling barrier 64b.

[0047] Each tumbling lock is transferred between its respective positions by means of a drive unit 65.

[0048] The majority of the tumbling barriers form a cascade of tumbling barriers. Even with steep inclines in the chute area, excessive speed of the conveyed goods can be prevented. Furthermore, collisions between the conveyed goods in chute area A2 are prevented.

[0049] A control unit 63 is provided for controlling the drive units 65. The input signals are the output signals from the occupancy sensors 6.

[0050] It is not necessary for the tumble stop devices to be able to stop all types of conveyed goods. In one design, small envelopes can pass through a gap between the chute and the tumble stop device (in the closed position) without negating the advantages for larger conveyed goods.

[0051] Fig. Figure 11 shows the tumbling block in different positions. Fig. Figure 11a shows the tumbling lock in the locked position. By pivoting it about a horizontal axis H, the tumbling lock is moved into the open position ( Fig. 11b). By pivoting about a vertical axis V, the tumble lock is moved into a maintenance position ( Fig. 11c). In particular, in the maintenance position, a person can walk along the slide area A2 and pass over the tumbling barrier 64 without climbing. The axes H and V do not need to be exactly horizontally or vertically aligned.

[0052] The tumbling barrier has an impact surface of 67 ( Fig. 12 and Fig. 13), which points in the opposite direction of conveyance F. On the impact surface 67, conveyed goods 9 collide with the tumbling barrier 64, which slides along the chute 11 in the direction of conveyance F. The impact surface 67 is made flexible.

[0053] In the design according to Fig. 12. The compliance results from a slight pivotability of the tumbling stop in the closed position. The tumbling stop is held in the closed position by a spring. If a conveyed material 9 strikes the tumbling stop in its closed position, the impact force may cause the tumbling stop 64, and thus the impact surface 67, to move slightly beyond the fully closed position, without reaching the open position. A spring force, exemplified by a torsion spring 68, forces the tumbling stop into the closed position, preventing it from reaching the open position.

[0054] In the design according to Fig. 12. The compliance is achieved by a deformable impact element 67K, which is firmly attached to the tumbling barrier. The impact element can be a cushioning element that deforms elastically or inelastically upon impact with the conveyed material. Reference symbol list 1 Funding order 4 Termination 7, 7a, 7b sorter 71 sorting trolleys 8 delivery vans 9 Goods to be transported (postal parcel) 11-19 End stop slide 51 rigid side guide 52 movable side guides 52a Actuator 53 Sliding cushion element 54 damping movable side guides 541 Spring damper arrangement 60 tumble detection 61 Camera 62 microphone 63 Control 64 tumbling blocks 65 Actuator 66 Occupancy sensor 67 Impact area 67K impact body 68 Torsion spring 70 direction-changing conveying section of the slide area 71 position-adjustable conveying surface 72 Actuator 73 Occupancy sensor 74 Control 75 Pre-sorting station 76 Package Size Calculators 541 Restoring agent and / or braking agent 80 Brake slide arrangement 81 Drive 82 circumferential brake slide 83 Brake slide guide A1 Takeover area A2 Slide area A2a,b,c partial slide area A3 Transfer area F Conveyor direction B Minimum width H horizontal axis V vertical axis QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2019 / 002048 A1

[0002] EP 1 868 923 B1

[0003] DE 10 2019 119 696 A1

[0004] DE 10 2010 005 267 A1

[0005] DE 197 19 748 C2

[0006] EP 2 922 775 B1

[0007] DE 10 2021 106 255.1

[0039]

Claims

[1] Conveyor arrangement (1) comprising an end-point chute (11, 12,...) - for the transfer of a conveyed item (9), in particular a postal parcel (9), at a transfer area (A1), in particular from an upstream feeding device (7) - for the transfer of the conveyed goods (9) at a transfer area (A3), in particular at a terminal (4); - for transferring the conveyed material (9) in a chute area (A2) from the receiving area (A1) to the transfer area (A3), wherein the end chute is inclined downwards in the conveying direction (F) so that the conveyed material (9) is transported sliding due to gravity, in particular comprehensive means to reduce damage to the conveyed goods. [2] Conveying arrangement according to the previous claim, comprising several end chutes arranged side by side, wherein each end chute is laterally bounded by a side guide (51, 52), in particular wherein the side guide comprises in particular a rigid side guide (51). [3] Funding arrangement according to the previous claim, characterized by , that the lateral guide includes a movable lateral guide (52) whose position can be adjusted in a targeted manner, in particular by means of an actuator (52a), in particular designed for the targeted and / or temporary enlargement of an area, in particular the take-up area (A1), of the associated end chute (11..19). [4] Funding arrangement according to the previous claim, characterized by , that the movable side guide (52) is assigned to two adjacent end chutes (11,12). [5] Conveying arrangement according to one of claims 2 to 4, characterized by, that the side guide (51) includes a sliding cushion element (53). [6] Conveying arrangement according to one of claims 2 to 5, characterized by , that the lateral guide includes a damping movable lateral guide (54). [7] Conveying arrangement according to one of claims 2 to 6, characterized by , that the side guide is mounted in such a damping manner that, in the event of an impact of a conveyed material (9) on the side guide (54), it can be moved away in the direction of impact, in particular wherein restoring means (541) and / or braking means (541) are provided to return the lateral guide (54) to a starting position or to brake the movement. [8] Funding arrangement according to one of the preceding claims, characterized by, that two end chutes (11, 12), in particular arranged next to each other, lead into a common end point (4), wherein the two end chutes (11, 12) each have a different minimum width (B). [9] Funding arrangement according to the previous claim, characterized by , that the two end chutes (11, 12), which each lead into a common end point (4) at the transfer section (A3), are connected to different feed devices (7a, 7b) at the takeover section (A1), in particular that a first end chute (11) is connected to a first feed device (7a) and that a second end chute (12) is connected to a second feed device (7b). [10] Conveying arrangement according to claim 8 or 9, characterized by , that the funding arrangement (1) is set up in such a way, that the first feeder (7a) feeds packets with a maximum first packet size and the second feeder (7b) feeds packets with a maximum second packet size, wherein the second maximum packet size is smaller than the first maximum packet size, In particular, the conveying arrangement includes a conveying material weight detection system and / or a pre-sorting station. [11] Funding arrangement according to one of the preceding claims, characterized by that the conveying arrangement is set up to specifically detect a tumbling conveyed material (9) and / or to specifically slow it down. [12] Funding arrangement according to one of the preceding claims, characterized by a tumble detection system (60) which is set up to detect a tumbling conveyed material (9). [13] Funding arrangement according to one of the preceding claims, characterized by a tumbling stop (64) which is designed to selectively at least slow down a tumbling conveyed item (9), wherein the tumbling stop can be selectively activated to slow down a tumbling conveyed item, in particular by means of the tumbling detection (60), in particular where the tumbling lock can be selectively transferred between a closed position and an open position. [14] Conveying arrangement according to one of the preceding claims, characterized by a direction-changing conveying section (70) which is set up to selectively influence the conveying direction of the conveyed material in the chute area (A2) immediately before reaching the end point, so that the conveyed material can be selectively transferred to different areas of the end point (4) at the transfer area (A3). [15] Funding arrangement according to the previous claim, characterized by , that the direction-changing conveying section (70) comprises a position-changing conveying surface (71). [16] Funding arrangement according to one of the preceding claims, characterized by , that the end point (4) can be selectively adjusted in height by means of a height adjustment, in particular by means of an actuator (73) of the height adjustment. [17] Conveying arrangement according to one of claims 14 to 16, characterized by , that the direction-changing conveying section (70) and / or the height adjustment is controlled based on an occupancy detection (73, 74) of the end point, in particular such that a position of the position-changing conveying surface (71) and / or the height of the end point (4) is set on the basis of the occupancy detection, in particular by means of an actuator (72, 72). [18] Conveying arrangement according to one of claims 13 to 17, characterized by , that the position-variable conveying surface (71) comprises a bottom support surface or an upright side guide surface. [19] Conveying arrangement according to the previous claim, comprising as a feeding device at least one sorter (7; 7a, 7b) and / or at least a first feeding device (7a) and a second feeding device (7b). [20] Conveying arrangement according to one of the preceding claims, characterized by a brake slide arrangement (80) comprising a plurality of brake slides (82) which are held circumferentially on a brake slide guide (83), wherein the brake slides (82) are arranged to interact with a conveyed material (9) located in the slide area (A2) such that the conveyed material - it accelerates if it moves at a lower speed than a predetermined speed, - will be slowed down if it is moving at a speed greater than a specified speed. [21] Funding arrangement according to the previous claim, characterized by , that the brake slide guide (83) is arranged above the slide area and / or the end slide, and / or that the brake slides (82) protrude from above into the slide area. [22] Conveying arrangement according to claim 13, characterized by , that at least two tumbling barriers (64a, 64b) are arranged one behind the other, wherein the slide area (A2) is divided into several partial slide areas (A2a,b,c), wherein the at least two tumbling barriers (64a, 64b) are each configured in a closed position to prevent the sliding of a conveyed material (9a, 9b) from an upstream partial slide area (A2a, A2b) into a downstream partial slide area (A2b, A2c). [23] Funding arrangement according to the previous claim, characterized by , that in a normal operating mode the conveying device is set up in such a way that the tumbling stop (64a, 64b) is only moved from the closed position to the open position if - in a partial slide area (A2a, A2b) which is located upstream of the tumbling barrier (64a, 64b), a conveyed material (9a, 9b) is present, and - in a partial slide area (A2b, A2c) which is downstream of the tumbling barrier (64a, 64b), no conveyed material (9a, 9b) is present. [24] Conveying arrangement according to one of claims 13, 22 or 23 , characterized by , that the tumbling lock can be moved from the open position and / or the closed position to a maintenance position in a maintenance operation; in particular that the tumbling lock (64) can be moved from the closed position to the open position about a horizontal pivot axis (H) and can be moved from the open position and / or the closed position to the maintenance position by means of a vertical pivot axis (V). [25] Conveying arrangement according to one of claims 13, 22, 23 or 24 , characterized by , that the tumbling barrier (64) has a flexibly arranged impact surface (67).

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