Device and method for detecting containers by means of x-ray radiation

Abstract

The invention relates to a device (1) for detecting containers (10), comprising a transport device (2) which transports the containers (10) in a predefined transport direction, at least one first radiation device (3) which emits high-energy radiation, in particular X-ray radiation, onto the containers (10) to be detected, and a first sensor device (4) which transmits the high-energy radiation onto the containers (10) to be detected. The first sensor device is adapted and intended for receiving the radiation emitted by the radiation device onto the containers, and wherein the transport device forms a bearing surface (20) which is movable in the transport direction and supports the containers (10) at their container bases, characterized in that the first sensor device is adapted and intended for receiving the radiation emitted by the radiation device onto the containers, and in that the first sensor device is adapted and intended for receiving the radiation emitted by the radiation device onto the containers. The support surface has a plurality of carrier elements (22) made of a plastic material, and also has at least one guide device (24) for guiding the carrier elements (22), the guide device containing a metal.

Description

[0001] manual

[0002] The invention relates to an apparatus and a method for inspecting containers, in particular filled containers. From the prior art, there are various apparatuses and methods for inspecting containers. Among these apparatuses and methods, it is known to inspect the base area or base, in particular such containers, and also to inspect in particular filled containers. For this purpose, it is known to use X-ray radiation to carry out such inspections. The greatest difficulty with such whole-bottle inspection methods using X-ray radiation is that the objects are conveyed through the X-ray unit. It is known that the containers are conveyed using double-sided belts, so that the bottom is exposed. It is also known that the containers are conveyed on conveyor chains or conveyor belts.

[0003] In order to be able to measure the container base, the conveyor chain should be very uniform and preferably free of metal. For example, special chains with solid plastic elements are known from the prior art. The problem with these chains is that they are prone to wear and tear; for example, the chain is stretched or worn very quickly and must therefore be replaced frequently.

[0004] Furthermore, despite the special structure, remnants of the structure are still visible in the camera image. This is because the plastic used absorbs a large part of the X-ray radiation, so that the chain becomes visible as a "ghost image", so to speak. Less absorbent plastics cannot be used in the prior art, because such plastics are too soft to be used as chains and would stretch and have to be replaced more quickly. This would also lead to a shorter service life.

[0005] From EP 2 435 344 B1 an X-ray inspection system with a conveyor chain is known.

[0006] The object of the invention is therefore to provide a device and a method for inspecting containers which, on the one hand, exhibit little wear and, on the other hand, allow for an adequate inspection by X-ray radiation. This is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments and improvements are the subject matter of the dependent claims.

[0007] The device for inspecting containers according to the invention has a conveying device that conveys the containers along a predefined conveying direction. In addition, the device has at least one first radiation device that emits high-energy radiation onto the container to be inspected, in particular X-ray radiation, and a first sensor device that is suitable and intended for receiving the radiation emitted by the radiation device onto the container. The conveying device has a support surface (and / or support device) that is movable in the conveying direction, which supports the containers at their container bases, in particular in this way to transport the containers.

[0008] According to the invention, the bearing surface has a plurality of carrier elements made of plastic material and also has at least one guide device for guiding the carrier elements, wherein the guide device contains metal. The guide device can be made of metal or can contain metal; for example, the guide device can be made of metal reinforced plastic. The metal is preferably selected from the group consisting of iron, steel and aluminum, but other metals are also conceivable.

[0009] The idea of ​​the invention is therefore to create a carrier element for a container which is constructed in two parts. Those areas for direct support of the container are preferably formed from a non-absorbent plastic and the elements subject to high loads, such as the mentioned guide elements, are made from a harder material which also absorbs X-ray radiation, which is acceptable.

[0010] Preferably, the support surface is flexible, this flexibility being achieved in particular by the mobility of the individual carrier elements relative to each other.Preferably, this flexibility exists in a plane formed by the conveying direction and the longitudinal direction of the conveyed containers.

[0011] Preferably, the conveying device conveys the containers in a vertical position, wherein the base of the containers stands in particular on a supporting surface.

[0012] On the one hand, this ensures that the X-ray radiation is not absorbed in the detection-relevant region and thus does not influence the detection, but on the other hand, those elements of the transport device which are subject to high mechanical loads are made of a more stable material.

[0013] Therefore, plastics with ultra-low X-ray absorption are used as the material for the carrier elements of the containers. These carrier elements or plates are preferably guided by a guide device, such as a wide transfer station, which can use a toothed belt as a guide element, in particular a steel and / or CFRP reinforced toothed belt, as described in detail below.

[0014] Preferably, the carrier elements are each fastened to a guide device (which can also be referred to as carrier device).

[0015] Particularly preferably, the device has a shielding device for shielding X-ray radiation. Particularly preferably, the shielding device completely surrounds the device in the conveying direction of the container, in particular in the detection area. The shielding device can have walls that prevent the X-ray radiation from passing through. In addition, the shielding device can also have a labyrinth-like structure, which prevents the X-ray radiation from escaping from the shielding device after one or preferably two reflections.

[0016] The carrier element under consideration absorbs no X-ray radiation or only a small amount of X-ray radiation.Although the guide device absorbs X-ray radiation, it is preferably arranged outside the measurement area of ​​the plastic container and therefore does not influence the detection.

[0017] Preferably, the carrier element is arranged on an upper side of the support surface of the carrier container base and the guide device is arranged on an underside of the carrier element opposite the upper side.

[0018] The conveying direction is particularly preferably straight.Preferably, radiation, in particular X-ray radiation, is also directed at least onto the container base, in particular through the container base.The receiver device or sensor device detects the radiation which has passed through the container.

[0019] In a preferred embodiment, the sensor device is suitable and intended for spatially resolved recording of X-ray radiation. Particularly preferably, the sensor device is suitable for recording and / or outputting spatially resolved images of the (X-ray) radiation incident thereon.

[0020] Particularly preferably, the guiding device or parts of the guiding device are not located in the beam path of the outgoing x-ray radiation to be received.

[0021] In a further advantageous embodiment, the carrier elements have a parallelogram cross section relative to a plane which is perpendicular to the conveying surface and which extends in the conveying direction. This can preferably ensure that the adjoining sides of adjacent carrier elements are inclined at an oblique angle relative to the conveying direction and that the carrier elements preferably overlap each other in the conveying direction.

[0022] In another preferred embodiment, the guide device is arranged outside the conveying area of ​​the conveying device. This means that the container to be conveyed is not arranged above the guide device.

[0023] In another preferred embodiment, the conveying device is operable such that the containers to be inspected are conveyed past a curtain of electromagnetic radiation extending in a plane intersecting the plane of the support surface along a line extending perpendicularly to the conveying direction.

[0024] Particularly preferably, the conveying device has a conveying length (particularly in the conveying direction) of more than 1 m, preferably more than 2 m, preferably more than 3 m and preferably more than 3.5 m. In another advantageous embodiment, the conveying device has a conveying length in the conveying direction of less than 10 m, preferably less than 8 m, preferably less than 6 m and preferably less than 5 m.

[0025] In another preferred embodiment, the carrier element is configured in the form of a web or a strip and preferably has a cross section similar to a rectangle or a parallelogram.

[0026] In another preferred embodiment, the carrier element has a first end portion and a second end portion, and the guide device is arranged on these end portions, in particular is fastened to these end portions. In this way, on the one hand, a high stability can be achieved, and on the other hand, the guide device can be prevented from being located in the measuring area of ​​the device.

[0027] In another advantageous embodiment, the carrier element is made of a plastic that absorbs no X-ray radiation or only very little X-ray radiation. Particularly preferably, the plastic material is selected from a group of plastic materials including PEEK, Teflon and PET. In another preferred embodiment, the carrier element is made of a synthetic material that is transparent to high-energy radiation, in particular acetate resin or polypropylene.

[0028] Particularly preferably, the carrier element is provided with double-sided guiding and / or fixing means. The carrier element can be fixed to these guiding means. Particularly preferably, the guiding means are arranged at a distance of at least 10 cm, preferably at least 20 cm and preferably at least 25 cm from one another (in particular in the transverse direction). Preferably, the distance of the guiding means from one another is less than 60 cm, preferably less than 50 cm, preferably less than 40 cm. These distances have proven to be particularly advantageous in order, on the one hand, to ensure sufficient stability and, on the other hand, to keep the guiding means outside the measuring area of ​​the device.

[0029] In a preferred embodiment, at least one radiation device is arranged laterally on the conveying station and / or on the conveying device.

[0030] In another advantageous embodiment, the conveyor is an endless conveyor, in particular an endless conveyor belt or a conveyor chain. This means that each chain link preferably consists of a guide and a carrier element arranged on the guide. Thus, as described above, the guide of the chain is arranged transversely or partially transversely relative to the carrier element.

[0031] Preferably, the distance between the upper side of the conveyor belt running in the conveying direction (which conveyor belt also forms the support surface in this case) and the lower side of the conveyor belt running in the direction opposite to the conveying direction is greater than 10 cm, preferably greater than 20 cm, preferably greater than 30 cm. Particularly preferably, this distance between the upper side of the conveyor belt running in the conveying direction and the lower side of the conveyor belt running in the direction opposite to the conveying direction is less than 100 cm, preferably less than 90 cm, preferably less than 80 cm and preferably less than 70 cm.

[0032] In a further advantageous embodiment, at least one radiation device is arranged between the upper side and the lower side of the conveying device.

[0033] In another advantageous embodiment, the guide device is a belt, in particular a toothed belt, or has a belt, in particular a toothed belt. In particular, the belt is a steel-reinforced toothed belt. As mentioned above, it is particularly preferred that two guide devices, in particular two transverse toothed belts, are provided. The carrier element can be fixed to these belts.

[0034] In a further advantageous embodiment, the carrier element has a thickness of more than 2 mm, preferably more than 3 mm. In a further advantageous embodiment, the carrier element has a thickness of less than 10 mm, preferably less than 8 mm and particularly preferably less than 6 mm. Particularly preferably, the thickness is substantially constant over the width of the carrier element.

[0035] In a further advantageous embodiment, the length of the carrier element extending perpendicularly to the conveying direction is greater than 10 cm, preferably greater than 20 cm, preferably greater than 25 cm. In a further preferred embodiment, the length of the carrier element extending perpendicularly to the conveying direction is less than 100 cm, preferably less than 90 cm, preferably less than 80 cm, preferably less than 70 cm, preferably less than 60 cm, preferably less than 50 cm, preferably less than 40 cm, particularly preferably less than 30 cm.

[0036] As already mentioned above, these lengths are chosen so that, on the one hand, the carrier element still has sufficient stability and, on the other hand, the carrier element is wide enough to avoid damaging influences.

[0037] Particularly preferably, the carrier elements are at a distance of less than 10 mm, preferably less than 8 mm, preferably less than 6 mm, preferably less than 4 mm and preferably less than 3 mm from one another in the position in which the container is located above the carrier elements.

[0038] In a further advantageous embodiment, the carrier element has a width in the conveying direction of more than 5 cm, preferably more than 10 cm and preferably more than 15 cm. Particularly preferably, the carrier element has a width in the conveying direction of less than 50 cm, preferably less than 40 cm, preferably less than 30 cm and preferably less than 25 cm. These dimensions have also proven to be particularly advantageous, since the device can be operated without problems with these dimensions.

[0039] In a preferred embodiment, the device has at least one second (X-ray) radiation device and / or at least one second receiving device. Particularly preferably, at least one second (X-ray) radiation device and a second receiving and / or sensor device are provided. These devices can preferably detect the container to be detected from different angles.

[0040] Particularly preferably, at least one X-ray radiation device is arranged above the container base, and particularly preferably, at least one X-ray radiation device is arranged below the container base. Particularly preferably, at least one sensor device is also arranged above the container base and / or at least one sensor device is arranged below the container base. In this way, a comprehensive image of the base of each container can be recorded using the transmitted light method.

[0041] Particularly preferably, at least one X-ray radiation device and a sensor device are arranged which receives the radiation radiated by the X-ray radiation device onto the container such that the beam path of the X-ray radiation extends obliquely with respect to the longitudinal direction of the container to be inspected. Particularly preferably, the beam path also extends obliquely with respect to the transport direction of the container. Particularly preferably, the angle between the longitudinal direction of the container and the main beam direction of the X-ray radiation device is greater than 10°, preferably greater than 15°, preferably greater than 20°, preferably greater than 25°, preferably greater than 30°, and preferably greater than 35°. Particularly preferably, the angle is less than 80°, preferably less than 70°, preferably less than 65°, preferably less than 60°, and particularly preferably less than 55°.

[0042] In another preferred embodiment, at least one X-ray radiation device and a sensor device are arranged, which receives the radiation radiated by the X-ray radiation device onto the container, so that the beam path of the X-ray radiation extends obliquely with respect to the longitudinal direction of the container to be inspected. In a preferred embodiment, one or more radiation devices are arranged transversely with respect to the conveyor device and can therefore record through the plastic-air (in particular PEEK-air) area. For example, a preferred recording angle is an angle of 45° from above. The only dead zone here is a narrow band, which is arranged away from the container base.

[0043] In a preferred embodiment, the guide and / or sliding profile in the measuring window are also made of plastic, specifically made of PEEK. Before and after the measuring window, standard elements (e.g., made of steel and / or reinforced plastic) are also provided.

[0044] In another advantageous embodiment, the device has an unloading device for unloading the inspected container from the conveying device. Preferably, a transfer device is provided here for transferring the container from the conveying device to the unloading device.

[0045] Particularly preferably, the transfer device is configured such that it conveys the containers obliquely relative to the conveying direction. Particularly preferably, the conveying angle relative to the conveying direction is greater than 5°, preferably greater than 10°, preferably greater than 15°, and preferably greater than 20°. Preferably, the angle is less than 60°, preferably less than 50°, preferably less than 40°.

[0046] Particularly preferably, the transfer device is a rail or has a rail, which particularly preferably transfers laterally downwards onto an unloading device, in particular another conveying device, such as a conventional table chain.

[0047] Particularly preferably, the position detection device and / or the path tracking device is arranged downstream of the radiation device in the conveying direction. Particularly preferably, the position detection device has at least one light barrier and preferably an array of light barriers, in particular for FIFO tracking (first in, first out). Particularly preferably, the device has at least one additional position detection device and preferably a plurality of additional position detection devices. As mentioned, these devices can be, for example, light barriers.

[0048] In a further advantageous embodiment, the device has a feed device which conveys the containers onto the conveying device, wherein the feed device preferably has a conveying wheel for conveying the containers or a conveying screw for conveying the containers.

[0049] As mentioned above, such insertion may also take place by displacements produced by conventional conveyor belts. In the embodiment described here, however, the containers are arranged directly onto the conveyor, in particular centrally positioned by means of an indexing system such as a conveyor wheel. The indexing system may be, for example, an indexing screw arranged obliquely, or an outlet star wheel of a preceding rotary conveyor such as a filling device or a labelling machine, or even a single-sided or double-sided belt station.

[0050] The invention also relates to a facility for handling liquid containers. The facility preferably has a filling device and in particular also a labeling device or a printing device for printing the containers. As described above, the device for detecting containers according to the invention is arranged downstream of these devices. In another advantageous embodiment, the invention is used in a canning facility.

[0051] The invention also relates to a method for inspecting containers, wherein the containers are transported along a predefined transport direction using a conveying device, and at least one first X-ray radiation device emits X-ray radiation onto the containers to be inspected, and a first sensor device detects radiation emitted by the X-ray radiation device onto the containers or radiation generated thereby (or radiation radiated by the radiation device onto the containers and transmitted by the containers), wherein the conveying device forms a support surface which is movable in the conveying device and supports the containers at their container bases and thus transports the containers.

[0052] According to the invention, the supporting surface has a plurality of carrier elements made of a plastic material (specifically a plastic material that does not absorb X-ray radiation or absorbs only a small amount of X-ray radiation) and at least one guiding device for guiding these carrier elements, wherein the guiding device is reinforced and / or has metal and / or a material that absorbs X-ray radiation.

[0053] Preferably, the container is a filled container, specifically, also a labeled and / or printed container. Specifically, the container is a container closed with a container closure or a filled closed beverage can.

[0054] Preferably, the containers are conveyed by the conveying device in such a way that they are spaced apart from each other in the conveying direction. Preferably, the spacing distance between the containers is greater than 2 mm, preferably greater than 3 cm, preferably greater than 4 cm, and preferably greater than 5 cm. Preferably, the spacing distance is less than 30 cm, preferably less than 20 cm, preferably less than 15 cm.

[0055] In a further preferred method, the containers are transported in a straight line during the inspection and / or after the inspection the containers are also transported at least perpendicularly to the transport direction.

[0056] In another preferred method, a conveyor belt or a rotating conveyor, an indexing screw or a single-sided or double-sided belt station is used to feed the container to the conveyor. Particularly preferably, another conveyor belt is used to unload the container after the container is detected.

[0057] In a further preferred method, the sensor device records a spatially resolved image of the transported containers.

[0058] Particularly preferably, the base of the container is detected. Particularly preferably, the sensor device receives radiation emitted by the X-ray radiation device and transmitted by the container.

[0059] Particularly preferably, the x-ray radiation therefore passes through the carrier element between the radiation device and the sensor device.

[0060] Preferably, in the context of the present invention, it is recommended to use plastic as carrier element, in particular Lexan or PET.

[0061] Therefore, in the context of the present invention, it is particularly preferred to use plastic as the carrier element, in particular PEEK. PEEK is barely visible in the camera image and has an absorption capacity that is almost the same as air at wavelengths specific to X-rays. In this way, the carrier elements can also be placed away from each other and a structure without air gaps can be formed.

[0062] Another advantage comes from the above-mentioned, in particular lateral loading and / or unloading of the containers, in particular loading and / or unloading of the entry and / or exit area. In this way, X-ray protection is simultaneously achieved in the conveying direction of the device.

[0063] As mentioned above, if an outlet star wheel of a rotating conveyor is used in the inlet area, the entire detection device can be made very compact and in particular the detection device can be mounted on or integrated into the guiding machine. Preferably, the service life of the conveyor is also significantly longer than that of a conventional conveyor chain.

[0064] Further advantages and embodiments can be seen in the accompanying drawings, in which:

[0065] Figure 1 is a schematic diagram of an apparatus according to the present invention;

[0066] Figure 2 yes Figure 1 a side view of the device shown;

[0067] Figure 3 is a detailed diagram of a test using X-ray radiation; and

[0068] Figure 4 is another detail diagram of detection using X-ray radiation.

[0069] Figure 1 A schematic diagram of an apparatus 1 for inspecting containers 10 according to the invention is shown. Reference numeral 2 denotes a conveying device, such as a conveyor belt or a conveyor chain, which conveys the containers 10 in a conveying direction P. Reference numeral 14 denotes a shielding element, which is used to shield the X-ray radiation. Reference numeral 5 schematically denotes an actual X-ray inspection device, which will be described in more detail below. After inspection, the containers 10 are transported by a transfer device 16, which can also be a conveyor belt, to another conveying device or unloading device 8. It can be seen that the transfer device 16 not only conveys the containers in the conveying direction P, but also perpendicularly to this conveying direction.

[0070] Reference numeral 30 denotes a feed device, such as a conveyor star wheel, which here places the container 10 substantially centrally onto the conveyor device 2. Reference numeral 20 denotes a support surface which supports the container during conveyance.

[0071] Figure 2 Shows Figure 1 A partial side view of the device shown. In this case, deflection rollers 26, 28 are provided, which guide the transport components (i.e., in particular the support surface and the guide means) in an endless manner. The support surface 20 is shown again here, but only on the upper side. This support surface 20 consists of a plurality of carrier elements (which will be described in more detail below).

[0072] Figure 3 Another view of the actual detection unit 5 is shown. Reference numeral 3 here refers to a first X-ray radiation device and reference numeral 12 to a second X-ray radiation device. These X-ray radiation devices each illuminate the support surface, in particular the individual carrier elements 22. Reference numerals 4 and 14 denote sensor devices, which detect the radiation irradiated by the radiation device onto the container, in particular in a spatially resolved manner. These sensor devices can have cameras that are sensitive to X-ray radiation.

[0073] It can be seen that the carrier element 22 has two transverse guides 24. Reference numerals 22A and 22B denote the end portions of the carrier element carried by the guides 24. The guides 24 are made of a material that absorbs X-ray radiation. Figure 3 As shown, the region of the container base and of the carrier element 22 detected by the sensor device is located outside the region in which the guide device 24 is located.

[0074] Figure 4 A further representation of the detection unit in another embodiment is shown. In this embodiment, only one X-ray radiation device 3 is provided, which however preferably radiates in a plurality of directions. The X-ray radiation device 3 is here preferably arranged below the container.

[0075] Furthermore, two sensor devices 4 and 14 are provided here, which are preferably arranged above the conveyor device and / or above the container base. Figure 3 The embodiment shown is constructed in the same manner.

[0076] The applicant reserves the right to claim all features disclosed in the application documents that are essential to the invention, provided that they are novel with respect to the prior art, either individually or in combination. It is also to be noted that features that may be advantageous in themselves are also described in the various drawings. A person skilled in the art will immediately recognize that a particular feature described in a drawing may be advantageous even without employing further features from that drawing. Furthermore, a person skilled in the art will recognize that advantages may also result from a combination of several features shown in a single drawing or in different drawings.

Claims

1. A device (1) for inspecting containers (10), the device comprising a conveying device (2) for conveying the containers (10) in a predefined conveying direction, at least one first radiation device (3) for emitting high-energy radiation, in particular X-ray radiation, onto the containers (10) to be inspected, and a first sensor device (4) adapted and intended for receiving the radiation emitted by the radiation device onto the containers, wherein the conveying device forms a support surface (20) which is movable in the conveying direction and supports the containers (10) at their container bases, It is characterized in that The bearing surface has a plurality of carrier elements (22) made of plastic material and also has at least one guide device (24) for guiding the carrier elements (22), wherein the guide device contains metal.

2. The device (1) according to claim 1, It is characterized in that The carrier element is configured in the form of a mesh or a strip and preferably has a cross section similar to a rectangle or a parallelogram.

3. The device (1) according to at least one of the preceding claims, It is characterized in that The carrier element has a first end portion (22a) and a second end portion (22b), and the guide element (24) is arranged at these end portions (22a, 22b).

4. The device (1) according to at least one of the preceding claims, It is characterized in that The carrier element is made of a plastic material which absorbs no or only a small amount of X-ray radiation, wherein the plastic material is preferably selected from the group of plastic materials comprising PEEK, Teflon and PET.

5. The device (1) according to at least one of the preceding claims, It is characterized in that The conveying device is an endless conveying device and in particular a conveyor belt or a conveyor chain.

6. The device (1) according to at least one of the preceding claims, It is characterized in that The guiding device is a belt, and in particular a toothed belt.

7. The device (1) according to at least one of the preceding claims, It is characterized in that The carrier element has a thickness of more than 2 mm and preferably more than 3 mm and / or the carrier element has a thickness of less than 10 mm, preferably less than 8 mm and particularly preferably less than 6 mm.

8. The device (1) according to at least one of the preceding claims, It is characterized in that The device has at least one second radiation device (12) and / or at least one second sensor device (14).

9. The device (1) according to at least one of the preceding claims, It is characterized in that At least one X-ray radiating device and the sensor device are arranged, the sensor device receiving the radiation radiated by the X-ray radiating device onto the container, such that a beam path of the X-ray radiation extends obliquely with respect to a longitudinal direction of the container to be inspected.

10. The device (1) according to at least one of the preceding claims, It is characterized in that The device (1) has an unloading device (8) which unloads the inspected container from the conveying device, wherein a transfer device (16) is preferably provided which transfers the container (10) from the conveying device to the unloading device (8).

11. Device (1) according to the preceding claim, It is characterized in that The transfer device (16) is configured such that it transports the containers obliquely with respect to the transport direction.

12. The device (1) according to at least one of the preceding claims, It is characterized in that The device has a feed device (18) which conveys the containers onto the conveying device (2), wherein the feed device preferably has a conveying wheel (18a) for conveying the containers or a conveying wheel for conveying the containers or a conveying screw for conveying the containers.

13. A method for inspecting containers (10), wherein the containers are transported in a predefined transport direction using a conveying device (2), and at least one first radiation device (2) emits high-energy radiation, in particular X-ray radiation, onto the containers (10) to be inspected, and a first sensor device (4) detects the radiation emitted by the radiation device onto the containers, wherein the conveying device forms a support surface (20) which is movable in the transport direction and supports the containers (10) at their container bases, It is characterized in that The bearing surface has a plurality of carrier elements (22) made of plastic material and also has at least one guide device (24) for guiding the carrier elements (22), wherein the guide device contains metal.

14. The method according to claim 13, It is characterized in that The container is a filled container, preferably also a labeled and / or printed container.

15. The method according to claim 13 or 14, It is characterized in that The containers are conveyed in a straight line during their inspection and / or after their inspection at least perpendicularly to the conveying direction.

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