SLIDING TRACK ARRANGEMENT FOR ASSEMBLY MACHINE, ASSEMBLY MACHINE AND ASSEMBLY METHOD

Abstract

Slide track (12, 112), comprising: a continuous circumferential track with a layered printed circuit board, wherein the layered printed circuit board comprises an upper track layer (20) configured to supply electrical current to a device having a contact element (34) sliding along the upper track layer (20), wherein the layered printed circuit board further comprises a lower layer connected to the upper track layer (20), the lower layer being configured to supply electrical current to the upper track layer (20), and wherein the layered printed circuit board is flexible and bent around curves in the continuous circumferential track.

Description

Background of the invention 1. Technical field

[0001] The present invention relates generally to a slide rail system. In particular, the present invention relates to a slide rail system that can be used for an assembly machine or an assembly system, an assembly machine, and an assembly method. 2. State of the art

[0002] In prior art slide-track systems, a single movable brush unit slides along a metal track. The metal track can transfer current to the moving brush unit via brushes contained within the unit and connected to internal components of the moving brush unit. The metal track in these systems is often coated with a precious metal, such as hard silver or gold, to provide minimal electrical resistance and corrosion resistance. The cross-sectional area of ​​the metal track in known systems is typically related to the maximum current that the moving brush unit can draw from the track. As such, the track dimensions limit the current that can be supplied from the track to the moving brush unit.High power consumption can render known slideway systems unusable in certain applications where a slideway system would otherwise be desirable. Patent applications US 5,782,186 A, US 2011 / 0 294 391 A1, and US 2014 / 0 043 027 A1 describe slideway systems for different applications. Patent application US 2015 / 0 173 204 A1 discloses an assembly machine with a slideway system for dispensing heads. Patent application WO 2015 / 120 376 A1 describes a dispensing head for an assembly machine.

[0003] An improved slideway system, a system and a method for its use that would be applicable to an assembly machine would therefore be well received in the prior art. Brief description of the invention

[0004] According to one aspect of the invention, a slide track comprises: a continuous circumferential track incorporating a layered printed circuit board, wherein the layered printed circuit board includes an upper track layer configured to supply electrical current to a device having a contact element that slides over the upper track layer, the layered printed circuit board further comprising a lower layer connected to the upper track layer, and wherein the lower layer is configured to supply electrical current to the upper track layer. The layered printed circuit board is flexible and bent around curves in the continuous circumferential track.

[0005] According to a further aspect of the invention, an assembly machine comprises: a plurality of dispensing heads for at least partially assembling an unfinished product, each individual dispensing head of the plurality of dispensing heads containing a contact element and a track configured to supply electrical current to the dispensing head when the contact element comes into contact with the track as the dispensing head moves along the track, the track comprising a layered circuit board having an upper track layer configured to supply electrical current to the upper track layer. The track is circumferential and has curves. The layered circuit board is flexible and bent around the curves in the track.

[0006] According to a further aspect of the invention, an assembly method comprises the following steps: printing a layered printed circuit board with an upper track layer and a lower track layer beneath the upper track layer; supplying electric current to the upper track layer with the lower track layer; providing a dispensing head with a contact element; moving the dispensing head along the upper track layer while the contact element touches the upper track layer; supplying current to the dispensing head with the upper track layer; and bending the layered printed circuit board to form a continuous track from the layered printed circuit board. Brief description of the drawings

[0007] Some embodiments of the present invention will be described in detail with reference to the following figures, wherein identical designations denote identical parts, wherein: Fig. a perspective view of an assembly machine according to an exemplary embodiment illustrates; Fig. an exploded view of a slideway system according to an exemplary embodiment; Fig. A bottom view of a movable brush unit along arrows 3A - 3A in Fig. illustrated according to an exemplary embodiment; Fig. a side view of the movable brush unit of Fig. along the arrows 3B - 3B in Fig. illustrated according to an exemplary embodiment; Fig. A top view of a section of a slideway of the assembly machine of Fig. illustrated according to an exemplary embodiment; Fig. a top view of a section of another slideway according to an exemplary embodiment is illustrated; and Fig. A flowchart of an assembly method according to an exemplary embodiment is illustrated. Detailed description of the invention

[0008] A detailed description of the embodiments of the disclosed device and method described below is presented herein by way of example and without limitation with reference to the figures.

[0009] With reference to Fig. An assembly machine 10 according to an exemplary embodiment is shown. The assembly machine 10 is shown comprising a housing which is supported on a plurality of feet. The assembly machine 10 includes a slide 12 which is attached to the housing. One or more dispensing heads 14a, 14b can be configured to move along the slide 12, which – as shown in Fig. The dispensing heads 14a and 14b can, for example, be configured to pick up electronic components at a receiving location (not shown), to dispense a substance such as an adhesive, or to otherwise interact with an unfinished product (for example, by screwing a screw into an unfinished product). The receiving location can be attached to the assembly machine 10 or otherwise located near it. The dispensing heads 14a and 14b can also be configured to deposit electronic components at a depositing location (not shown), where, for example, a panel handling system provides an axis perpendicular to the slideway 12.

[0010] The dispensing heads 14a, 14b can be magnetically or mechanically attached to the slide 12 such that they are independently movable along the slide 12. It should be noted that the slide 12 and the assembly machine 10 can be configured to accommodate additional dispensing heads 14a, 14b (not shown). Furthermore, the assembly machine 10 can be modular in design. In the illustrated embodiment, the assembly machine 10 comprises a first modular section 16 and a second modular section 18. However, other embodiments can be larger and may include additional intermediate sections. The assembly machine 10 can thus be modularly extended as needed, as described in the referenced applications.

[0011] Thus, the slideway 12 can comprise a plurality of connected modular sections. In one embodiment, the slideway sections 12 can be smaller than the total number of modular sections 16, 18 of the assembly machine 10. For example, each individual modular section 16, 18 can comprise a plurality of slideway sections 12. Each of the slideway sections 12 (one of which is in Fig. (as shown) can be manufactured in standard lengths so that they can be attached, fastened, screwed, mounted or otherwise connected to a modular section 16, 18 of the assembly machine 10 or a non-modular assembly machine (not shown).

[0012] In Fig. An exploded view of a section of the slideway 12 is shown in the same orientation as in Fig. The slider 12 can be a layered printed circuit board with an upper track layer 20. The slider 12 can be a continuous circumferential track (as shown in Fig. (shown), wherein the layered printed circuit board is arranged along an entirety of the continuous circumferential track. The continuous circumferential track can comprise sections or lengths that may enable the modularity of the system. An exemplary section of the slide track 12 is shown in Fig. shown. The upper layer 20 comprises a first layer 22a, a second layer 22b and a third layer 22c, a fourth layer 22d and a fifth layer 22e (in Fig. (shown). Five tracks 22a, 22b, 22c, 22d, 22e are shown by way of example, and depending on the embodiment, there may be more or fewer than five tracks. The tracks 22a, 22b, 22c, 22d, 22e can each be configured to supply electrical power or current to a device, such as the dispensing heads 14a, 14b, which slide along the respective tracks 22a, 22b, 22c, 22d, 22e. In addition to supplying electrical power or current to the dispensing heads 14a, 14b, the tracks 22a, 22b, 22c, 22d, 22e can be configured to transmit bus communication or a bus signal to the dispensing heads 14a, 14b, as described below.

[0013] A first lower layer 24 is arranged directly beneath the upper track layer 20. A second lower layer 26 is arranged beneath the first lower layer 24, and a third lower layer 28 is arranged beneath the second lower layer 26. It should be noted that the layered printed circuit board can comprise any number of layers. In one embodiment, the number of layers is at least equal to or greater than the number of tracks 22a, 22b, 22c, 22d, 22e that are incorporated into the slide track 12. While three lower layers 24, 26, 28 are shown, the following can be considered in Fig. The illustrated embodiment therefore comprises at least five lower layers, corresponding to the five tracks shown.

[0014] Each individual lower layer 24, 26, 28 can be functionally connected to one of the traces 22a, 22b, 22c, 22d, 22e by connections 30. The connections 30 can be elements that electrically connect the traces 22a, 22b, 22c, 22d, 22e to one or more of the lower layers 24, 26, 28. The connections 30 are shown attached to an edge of each individual trace 22a, 22b, 22c, 22d, 22e and extending to one or more of the layers 24, 26, 28 below. The connections can be precisely spaced at regular intervals along the traces 22a, 22b, 22c, 22d, 22e and can supply current from the lower layers 24, 26, 28 to the traces 22a, 22b, 22c, 22d, 22e above. The connections 30 are configured to bypass layers and can be connected to individual layers or traces, utilizing the three-dimensional capabilities of a printed circuit board.

[0015] Connections 30 will be in Fig. For illustrative purposes, the slide is shown stretched. However, it should be noted that the combined layers 20, 24, 26, 28 of the track can be extremely thin, making the track flexible or elastic. Therefore, the connections can only extend over a distance sufficient to connect the tracks 22a, 22b, 22c, 22d, 22e to the corresponding layers 24, 26, 28 beneath them. The flexible or elastic design of the slide 12 allows it to bend around corners 32a, 32b, 32c, 32d (in Fig. (as shown) is bent to form suitable radii and circular paths. In other embodiments, the slide track 12 can be arranged horizontally (and not vertically as shown) in a raceway arrangement. Such a horizontally arranged or flat raceway can be manufactured using printed circuit board technology.

[0016] The lower layers 24, 26, 28 can each include a plurality of through-holes 33 through which the connections 30 can extend. These through-holes 33 allow the lower layers 24, 26, 28 to be electrically connected to the upper layer 20. It should be noted that these through-holes 33 allow the connections 30 to bypass one or more of the lower layers 24, 26, 28 and connect the individual tracks 22a, 22b, 22c, 22d, 22e to the respective lower layers 24, 26, 28. The connections 30 can be connected to each of the layers 24, 26, 28 at connection points 35. At these connection points 35, the connections 30 are directly connected to a respective layer and do not extend through it.

[0017] In one embodiment, the lower layers 24, 26, 28 can each be made of copper or another current-carrying conductive material. The lower layers 24, 26, 28 can each be attached to a single track 22a, 22b, 22c, 22d, 22e. In another embodiment, one or more layers can be made of brass instead of copper. For example, the bottommost layer can be made of brass due to its mechanical properties and attach the layer to the assembly machine 10.

[0018] The first lower layer 24 can be attached to and supply current to the first layer 22a, the second lower layer 26 can be attached to and supply current to the second layer 22b, and the third lower layer 28 can be attached to and supply current to the third layer 22c. Thus, the lower layers 24, 26, 28 can be layers associated with the layers 22a, 22b, 22c, 22d, 22e, each supplying current to one of the layers 22a, 22b, 22c, 22d, 22e on the upper layer 20. Similarly, the layers 22a, 22b, 22c, 22d, 22e can also be made of copper. In the Fig. In the illustrated embodiment, there can be five tracks, each of which has its own separate lower layer.

[0019] The use of printed circuit board technology in the slideway 12 can enable the slideway 12 to include electrical components, such as capacitors, coils, connectors, and the like. As in Fig. As shown, each individual section of track 12 can comprise one or more coils, capacitors, or electronic components 37 that are connected to or integrated with at least one of the individual tracks 22a, 22b, 22c, 22d, 22e and the lower layers 24, 26, 28. These coils, capacitors, or other electronic components 37 can provide spark suppression and improve the signals between the individual tracks 22a, 22b, 22c, 22d, 22e and the metering heads 14a, 14b, and furthermore reduce electrical noise between the upper track layer 20, the metering heads 14a, 14b, and the lower track layers 24, 26, 28. The coils, capacitors and other electronic components 37 can be installed, connected, inserted or surface-mounted on the back or front of the track 12.

[0020] In Fig. One of the metering heads 14a, 14b is shown. While the metering head 14a, 14b is described herein as a metering head, it should be noted that the disclosure is not limited to a metering head and that any type of suitable device can be configured to move around the slide track 12. This movement can be accomplished by rotating or rotating the device around the track. The metering head 14a, 14b is shown comprising a plurality of contact elements 34. These contact elements 34 can be metal brushes that can be configured to move or slide over the tracks 22a, 22b, 22c, 22d, 22e, etc. In one embodiment, the brushes can be made of a graphite material. Other metals are conceivable and may be suitable depending on their effectiveness and cost. Other embodiments may include metal wheels or similar components instead of brushes.In any case, the contact elements can be configured to move over the slide track 12, and in particular over the individual tracks 22a, 22b, 22c, 22d, 22e, to enable the transmission of electrical energy between the tracks 22a, 22b, 22c, 22d, 22e and the dosing head 14a, 14b.

[0021] Fig. shows a bottom view of the dosing head 14a, 14b along the arrows 3A - 3A from Fig. , moving in the direction of D1. Fig. This shows that the dosing head 14a, 14b moves over two sections of track 12a, 12b. These two sections of track 12a, 12b can represent the junction of two lengths of track 12, as shown in Fig. This is shown, or they can further illustrate where the first and second modular sections 16, 18 meet. Two contact elements 34 can be present and slide over a single track to ensure that at least one contact element 34 is fully in contact with the track at all times. It should be noted that more or fewer than two contact elements 34 per dispensing head can be assigned to each individual track 22a, 22b, 22c, 22d, 22e, etc., depending on the embodiment. In one embodiment, a single contact element can extend over the dispensing head 14a, 14b parallel to the tracks 22a, 22b, 22c, 22d, 22e. Fig. shows a side view of the dosing head 14a, 14b along the arrows 3B, 3B from Fig. . Fig. shows that each of the individual paths 22a, 22b, 22c, 22d, 22e consists of Fig. can include at least one associated contact element 34.

[0022] Each of the first track 22a, the second track 22b, and the third track 22c, etc., can be powered by its respective lower layers 24, 26, 28, etc. The voltage of each of these tracks 22a, 22b, 22c, 22d, 22e can be different. Thus, the first track 22a can supply a first voltage, the second track 22b a second voltage, and the third track 22c a third voltage to the respective contact elements 34 and the dispensing heads 14a, 14b. These separate voltages can be configured to operate different functions of the dispensing heads 14a, 14b. In one embodiment, one track can provide control signals to the dispensing heads 14a, 14b.

[0023] For example, one track can carry 380 V DC to power the dispensing heads 14a and 14b. Another track can provide 48 V DC to maintain a specific function when the 380 V track is switched off. A third track can provide 24 V DC for a safety system that carries a safety signal in conjunction with the dispensing heads 14a and 14b and the slide track 12. Furthermore, another track can carry a 5 V data or control signal to transmit a bus communication signal to the dispensing heads 14a and 14b. It should be noted that various other combinations of tracks and voltages are conceivable.

[0024] An earthing conductor 36 is arranged between the first track 22a and the second track 22b. This earthing conductor 36 can be formed or arranged between the current-carrying layers to improve the electrical isolation of the different tracks. For example, the earthing conductor 36 can be arranged between the track with the highest voltage and the adjacent track. Alternatively, earthing layers can be arranged between a signal-carrying track and a track carrying a higher voltage to maintain signal integrity in the signal-carrying track. Furthermore, one or more earthing layers 38, 39 can also be arranged between one or more of the lower layers 24, 26, 28 and / or the tracks 22a, 22b, 22c, 22d, 22e. In other embodiments, one or more earthing layers can isolate some or all of the current-carrying lower layers 24, 26, 28 from one another.It should be noted that each of the included lower layers 24, 26, 28 may include one or more insulating layers that surround the conductive material or are located above and / or below it.

[0025] The slide 12 can be attached to the structure of the assembly machine 10 using an adhesive, such as a pressure-sensitive adhesive. This makes it possible to attach the slide 12 directly to the mechanical structure of the assembly machine 10. As shown in Fig. As shown, the slide 12 can be further attached using screws or bolts 42 arranged at regular intervals along each individual section of the slide 12.

[0026] Section 40 of the slideway 12 is in Fig. as shown in an exemplary embodiment. The slide track 12 can thus be configured as the straight section 40 of the printed circuit board track, as shown. Each of the sections 40 of the slide track 12 can be manufactured in segments for mounting on the assembly machine 10. Each of the sections 40 of the slide track 12 can have its own electrical connections 44 at the beginning and at the end of each section 40. The electrical power can be supplied by the assembly machine 10 through the back of the slide track 12.

[0027] In Fig. Another embodiment of a slide track 112 is shown. The slide track 112 shown in this embodiment comprises a first track 120 and a second track 122, each consisting of five individual sections that are identical or similar to the tracks 22a, 22b, 22c, 22d, 22e described above. This embodiment shows that any number of tracks can be provided. Furthermore, the system can comprise two or more separate and independent tracks 120, 122 on which the dispensing heads 14a, 14b can move along a continuous circumferential path around the modular system. Thus, one or more dispensing heads 14a, 14b can be arranged on the upper track 120, while one or more of the dispensing heads 14a, 14b can be arranged on the lower track 122.The metering heads 14a, 14b can be dimensioned such that a gap exists between the metering heads 14a, 14b on the upper track 120, allowing them to pass the metering heads 14a, 14b on the lower track 122 without contact, and vice versa. Alternatively, it may be desirable for a metering head 14a, 14b to be connected to each of the ten tracks shown in this embodiment.

[0028] As in Fig.As shown, an assembly method 200 can be provided. The method can include a first step 210 of printing a layered printed circuit board, such as the slider 12, with an upper layer, such as the upper track layer 20, and a lower layer, such as one of the lower layers 24, 26, 28, beneath the upper track layer. The method can include a second step 220 of bending the layered printed circuit board to form a circumferential track. The method can include a further step 230 of supplying current to the upper track layer with the lower layer.This step can include supplying current to a first web, such as web 22a, with a first lower layer, such as lower layer 24, and supplying current to a second web, such as web 22b, with a second lower layer, such as lower layer 26. The method can further include a step 240 of providing a dispensing head, such as dispensing heads 14a, 14b, with a contact element, such as contact elements 34. A further step 250 can include supplying current to the dispensing head with the upper web layer, and in particular with the first and second webs. The method can include a step 260 of moving the dispensing head along the upper web layer while the contact element is in contact with the upper web layer.

[0029] The method can further provide a first track and a second track, as well as a first lower layer and a second lower layer. The method can include supplying power to the first track with the first lower layer, supplying power to the second track with the second lower layer, and supplying power to the dispensing head with each of the first and second tracks. The method can further include printing a plurality of layered printed circuit boards in sections and connecting the sections to form the circumferential track. The method can further include providing bus communication to the dispensing head with at least one of the first and second tracks.

[0030] The articles "a" or "an" precede the elements of the exemplary embodiments. These articles indicate that one or more of the elements are present. The expressions "comprising" and "with" and their derivatives indicate inclusion, meaning that there may be further or additional elements besides or alongside the elements mentioned. The conjunction "or," when used with a list or at least two expressions, means any expression or combination of expressions. The expressions "first" and "second" are used to distinguish between elements and are not used to denote a particular order.

[0031] While the invention has been described in detail in connection with only a limited number of embodiments, it should be noted that the invention is not limited to the disclosed embodiments. Rather, the invention can be modified to include any number of variations, changes, substitutions, or equivalent arrangements not described above, but which are consistent with the spirit and scope of the invention. While various embodiments of the invention have been further described, it should be noted that aspects of the invention may encompass only some of the described embodiments. Accordingly, the invention is not to be considered as limited by the foregoing description, but only by the scope of the appended claims.

Claims

[1] Slide track (12, 112), comprising: a continuous circumferential track with a layered printed circuit board, wherein the layered printed circuit board comprises an upper track layer (20) configured to supply electrical current to a device having a contact element (34) sliding along the upper track layer (20), wherein the layered printed circuit board further comprises a lower layer connected to the upper track layer (20), the lower layer being configured to supply electrical current to the upper track layer (20), and wherein the layered printed circuit board is flexible and bent around curves in the continuous circumferential track. [2] Slide track (12, 112) according to claim 1, wherein the layered printed circuit board comprises a plurality of sections (40) forming the continuous circumferential track. [3] Slide track (12, 112) according to claim 2, wherein the continuous circumferential track is attached to a plurality of connected modular sections (16, 18). [4] Slide track (12, 112) according to claim 1, wherein the continuous circumferential length of the track is configured to accommodate a plurality of devices such that the plurality of devices move independently of one another about the continuous circumferential length of the track, wherein each of the plurality of devices has a contact element (34) configured to slide over the upper track layer (20). [5] Slide track (12, 112) according to claim 1, wherein the upper track layer (20) comprises a first track (22a, 120) and a second track (22b, 122) and wherein the lower layer comprises a first lower layer (24) and a second lower layer (26), wherein the first lower layer (24) supplies an electric current to the first track (22a, 120) and wherein the second lower layer (26) supplies an electric current to the second track (22b, 122) and wherein the first track (22a, 120) is configured to supply a first voltage to the device and wherein the second track (22b, 122) is configured to supply a second voltage to the device. [6] Slide track (12, 112) according to claim 1, wherein the layered printed circuit board further comprises an electrical component which is integrated into at least one of the upper track layer (20) and the lower layer. [7] Slide track (12, 112) according to claim 1, wherein at least one of the first track (22a, 120) and the second track (22b, 122) is configured to transmit an electrical bus communication to the device. [8] Slide track (12, 112) according to claim 5, wherein the layered circuit board further comprises at least one grounding track (36) arranged between the first track (22a, 120) and the second track (22b, 122). [9] Slide track (12, 112) according to claim 5, wherein the layered printed circuit board comprises at least one grounding layer (38, 39) in the vicinity of at least one from the first lower layer (24) and the second lower layer (26). [10] Assembly machine (10), comprising: a. a plurality of dispensing heads (14a, 14b) configured to at least partially assemble an unfinished product, wherein the plurality of dispensing heads (14a, 14b) each contain a contact element (34); and b. a track configured to supply electrical current to the dispensing head (14a, 14b) when the contact element (34) touches the track while the dispensing head (14a, 14b) moves along the track, wherein the track comprises a layered printed circuit board with an upper track layer (20) configured to supply electrical current to the dispensing head (14a, 14b) and a lower layer connected to the upper track layer (20), wherein the lower layer is configured to supply electrical current to the upper track layer (20), wherein the track is circumferential and includes curves, and wherein the layered printed circuit board is flexible and bent around the curves in the track. [11] Assembly machine (10) according to claim 10, wherein the assembly machine (10) is a placement machine for the assembly of printed circuit boards and wherein the plurality of dispensing heads (14a, 14b) are placement heads and comprise a placement nozzle. [12] Assembly machine (10) according to claim 10, wherein the upper web layer (20) comprises a first web (22a, 120) and a second web (22b, 122) and wherein the lower layer comprises a first lower layer (24) and a second lower layer (26), wherein the first lower layer (24) supplies an electric current to the first web (22a, 120) and wherein the second lower layer (26) supplies an electric current to the second web (22b, 122) and wherein the first web (22a, 120) is configured to supply a first voltage to the plurality of metering heads (14a, 14b) and wherein the second web (22b, 122) is configured to supply a second voltage to the plurality of metering heads (14a, 14b). [13] Assembly machine (10) according to claim 12, further comprising a plurality of connected modular sections, and wherein the track is arranged on the plurality of connected modular sections. [14] Assembly machine (10) according to claim 10, further comprising a housing, and wherein the track comprises a plurality of track sections, each of which is attached to the housing. [15] Assembly machine (10) according to claim 13, wherein at least one of the first track (22a, 120) and the second track (22b, 122) is configured to transmit electrical communication to the plurality of dosing heads (14a, 14b). [16] Assembly machine (10) according to claim 13, wherein the layered printed circuit board comprises at least one grounding layer (38, 39) in the vicinity of at least one of the first lower layer (24) and the second lower layer (26). [17] Assembly method (200), comprising the following steps: a. Printing a layered printed circuit board with an upper track layer (20) and a lower layer below the upper track layer (20); b. Supply of electric current to the upper web layer (20) with the lower layer; c. Provision of a dosing head (14a, 14b) with a contact element (34); d. Method of the metering head (14a, 14b) along the upper web layer (20) while the contact element (34) touches the upper web layer (20); e. Supply of current to the metering head (14a, 14b) with the upper web layer (20); and f. Bending the layered printed circuit board to form a circumferential track from the layered printed circuit board. [18] Assembly method (200) according to claim 17, wherein the upper web layer (20) comprises a first web (22a, 120) and a second web (22b, 122) and wherein the lower layer comprises a first lower layer (24) and a second lower layer (26), wherein the method further comprises: a. the supply of current to the first track (22a, 120) with the first lower layer (24); and b. the supply of current to the second orbit (22b, 122) with the second lower layer (26); and c. the supply of current to the metering head (14a, 14b) with each of the first track (22a, 120) and the second track (22b, 122). [19] Assembly method (200) according to claim 17, comprising printing a plurality of the layered printed circuit boards in sections (40) and joining the sections (40) to form the circumferential track. [20] Assembly method (200) according to claim 18, further comprising supplying a bus communication to the metering head (14a, 14b) with at least one from the first lane (22a, 120) and the second lane (22b, 122).

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