专利摘要:
ABSTRACT A conveyor system for transporting articles in a Checkout counter is provided. The system comprises a loading conveyor (24) on Which articles may be placed by acustomer, a second conveyor (25) arranged in series With the loading conveyor (24)Which second conveyor (25) is operated at a higher speed than said loading conveyor(24) for increasing the distance between adj acent articles, Wherein the loading conveyor(24) is tilted With respect to a horizontal plane in a lateral direction, and Wherein saidconveyor system further comprises an interrnediate acceleration device (26) beingarranged between the loading conveyor (24) and the second conveyor (25) foraccelerating the articles When moving from the loading conveyor (24) to the second conveyor (25). To be published With Fig. l
公开号:SE1351194A1
申请号:SE1351194
申请日:2013-10-09
公开日:2015-04-10
发明作者:Magnus Törnvall;Per Olofsson;Fredrik Hagstedt
申请人:Itab Scanflow Ab;
IPC主号:
专利说明:

A CONVEYOR SYSTEM FOR A CHECKOUT COUNTERTECHNICAL FIELDThe present invention relates to a conveyor system for transporting articles inan automated Checkout counter as Well as to an automated checkout counter comprisingsuch conveyor system.
BACKGROUNDIn today°s stores many different articles, such as food products, hygienearticles, etc. may be purchased Which all have different sizes and shapes. Norrnally, acheckout operator handles each article manually and makes sure that the article isassociated With the correct pricing at checkout for payment by the customer. This istraditionally done either by manually inputting the price, by scanning a barcode attachedto the article, or a combination of those. In either case a conveyor system is oftenprovided for transporting the articles from the area of the customer to the area of thecheckout operator. A conveyor system norrnally includes an endless belt Which is drivenby a pair of rollers. When a customer positions an article on the belt it is automaticallytransported to the operator. A second belt is often provided for further transporting thearticles away from the operator and into a packing area.
In order to improve the Working conditions for the operator the first belt maybe arranged to align the articles such that they are received in an area Which is readilyreachable for the operator. One example of such system is disclosed in US3949l94, inWhich articles having a pre-attached bar code are aligned by means of a tilted conveyorbelt being supported by additional conveyor belts being arranged 90° relative the tiltedbelt. The additional belts are separated from each other such that a bar code reader mayscan the barcodes When they pass the slit formed between the additional belts. Hence,the prior art system makes sure that the articles are transported at a constant distancefrom each other and alloWs for an automatic detection of the bar code as long as thearticle is positioned correctly.
Automatic Checkout counters are becoming an interesting alternative for retailstores and supermarkets. Such checkout counters provides safe and easy handling ofarticles and they norrnally include different components for identifying the articleaccurately. Precise identification is desirable not only for ensuring proper operationwithout the need for operators, but also for preventing fraud. An important aspect ofprecise identification is the position of the articles to be identified. Therefore, there is aneed for an improved system for positioning articles, especially when such system isused in automatic checkout counters.
SUMMARYAn object of the present invention is to provide a conveyor system for acheckout counter which is improved over prior art. An idea of the present invention is toprovide a conveyor system for various articles, wherein the conveyor system ensuresthat the articles are aligned and separated from each other such that a sensor system,which is fixed relative the conveyor system, can identify the articles accurately.
According to one aspect of the present invention, a conveyor system isprovided. The conveyor system comprises a loading conveyor on which articles may beplaced by a customer, a second conveyor arranged in series with the loading conveyorwhich second conveyor is operated at a higher speed than said loading conveyor forincreasing the distance between adj acent articles, wherein the loading conveyor is tiltedwith respect to a horizontal plane in a lateral direction, and wherein said conveyorsystem further comprises an interrnediate acceleration device being arranged betweenthe loading conveyor and the second conveyor for accelerating the articles when movingfrom the loading conveyor to the second conveyor.
The interrnediate acceleration device may be configured to rotate around anaxis being arranged in parallel with the lateral extension of the loading conveyor. Therotation may implemented by means of one or more rollers, which preferably are drivenby an electrical motor at a speed being higher than the speed of the loading conveyorbut lower than the speed of the second conveyor. Hence, a more efficient separation ofarticles is provided.
Said interrnediate acceleration device may comprise a plurality of rollers beingarranged in parallel. The plurality of rollers may further be arranged at a distance fromeach other thus forrning a slit between each roller.
The loading conveyor, the second conveyor and the interrnediate accelerationdevice may be tilted by the same angle. The angle may be within the range of 5-25°, andpreferably approximately 10°.
The loading conveyor, the second conveyor and the interrnediate accelerationdevice may be tilted by different angles, wherein the tilting angle of the loadingconveyor may be higher than the tilting angle of the second conveyor.
One lateral end of the loading conveyor may be arranged adj acent to a slidingsurface, which sliding surface is tilted 90° relative the loading conveyor.
According to a second aspect an automatic checkout counter is provided. Thecheckout counter comprises a conveyor system according to the first aspect.
The automatic checkout counter may further comprise a classification devicefor identification of articles which are moving along said conveyor system, wherein saidclassification device may comprise at least one spectroscopy sensor being arranged atone lateral end of said second conveyor.
BRIEF DESCRIPTION OF THE DRAWINGSEmbodiments of the invention will be described in the following; referencebeing made it the appended drawings which illustrate non-limiting examples of hoe theinventive concept can be reduced into practice.
Fig. 1 is an isometric view of an automatic checkout counter according to anembodiment of the present invention;Figs. 2a-c are different views of a conveyor system according to anembodiment of the present invention;Figs. 3a-b are a top view and a side view of a checkout counter according to anembodiment of the present invention; andFig. 4a-c are top views of an interrnediate acceleration device according todifferent embodiments.
DETAILED DESCRIPTION OF EMBODIMENTSFig. 1 shows an automatic Checkout counter 10 comprising a conveyor system20 for transporting articles from a loading area 21 to a packing area 22, and aclassification device 40 through which the articles pass for automatic identification. Theidentified article may be displayed on a display unit 60. During operation, a customerapproaches the loading area 21 with one or more articles which are to be paid for. Whena first article is positioned on the loading area 21 it will be transported through theclassification device 40 whereby the article is identified. The article may be identified interms of type, e. g. as oranges, as well as by weight, and the result of the identification ispreferably shown on the display unit 60. The loading area 21 provides continuoustransport of articles as long as the customer keeps adding them, and each article istransported to the packing area 22 after identification. As can be seen in Fig. 1 thepacking area 22 is divided longitudinally, such that articles of two consecutivecustomers will not mix. Hence, a divider 23 is configured to direct the flow of articles inthe packing area to one of the two portions of the packing area 22, whereby the divideris moved to direct the articles to the other portion of the packing area 22 when a newcustomer is occupying the checkout counter.
Figs. 2a-c show the conveyor system 20 in more details. As can be seen in Fig.2a the conveyor system 20 extends from the loading area 21, and ensures articletransport through the classification device 40. The classification device 40 is furtherdescribed with reference to Figs. 3a-b.
The conveyor system 20 comprises a loading conveyor 24 on which articlesmay be placed by a customer, and a second conveyor 25 which is arranged in serieswith the loading conveyor. The identification of articles is performed by theclassification device 40 as the articles are arranged on the second conveyor 25.Preferably, a third conveyor 27 is provided in series after the second conveyor 25,which third conveyor 27 comprises a weight sensor for deterrnining the weight of thearticle being conveyed by the third conveyor 27.
Since a customer usually tend to place articles very close to each other on theloading conveyor 24, or even in a stacked manner, the second conveyor 25 will ensurethat the articles are separated from each other longitudinally, i.e. in the direction ofmovement. For this, the second conveyor 25 is operated at a higher speed than theloading conveyor 24.
In a preferred embodiment, the loading conveyor 24 is moving at a speed of0.05 - 0.25 m/s, and preferably at a speed of 0,15 m/s, while the second conveyor 25 ismoving at a speed of 0.4 - 0.6 m/s, and preferably at a speed of 0,5 m/s. The thirdconveyor 27, i.e. the scale, is preferably configured to move the articles at the samespeed as the second conveyor.
By allowing the second conveyor 25 to move faster than the loading conveyor24 the distance between adj acent articles will increase as they are entering theclassification device 40. In order to improve the separation of articles it has proven to bevery efficient to provide an interrnediate acceleration device 26 between the loadingconveyor 24 and the second conveyor 25. The interrnediate acceleration device 26 isprovided in order to allow the articles to be accelerated as they are being transportedfrom the loading conveyor 24 and the second conveyor 25.
As shown in Fig. 2a the interrnediate acceleration device 26 comprises tworollers arranged in series. In a preferred embodiment each roller is driven by a motor,whereby the motor is controlled such that the outer surface of the rollers move at aspeed which is higher than the speed of the loading conveyor 24 while it is lower thanthe speed of the second conveyor. In an embodiment, the outer surface of the rollersmove at a speed of 0,2 - 0,3 m/s, and most preferably at 0,25 m/s.
In other embodiment, the rollers are not driven by any motor but only rotateswhen a moving article is in contact with the rollers 26.
Hence, when an article is approaching the longitudinal end of the loadingconveyor 25 the speed of the article will increase due to the driving rotation of therollers of the interrnediate acceleration device 26. The article will thus be acceleratedacross the rollers , and once the article gets in contact with the second conveyor 25 thespeed will increase whereby the interrnediate acceleration device 26 allow for a smoothacceleration of the article.
An accurate identification of the articles by means of the classif1cation device40 benefits not only by a longitudinal separation, but also by having the articles alignedin a lateral direction, i.e. in a direction perpendicular to the longitudinal axis of theconveyor system 20. This is due to the fact that the classification device 40 comprisesone or more identification sensors which preferably have a fixed position relative thesecond conveyor 25.
In order to make sure that the articles being loaded are aligned laterally theloading conveyor 24, the second conveyor 25 and the interrnediate acceleration device26 are tilted in the lateral direction with respect to a horizontal plane. This is shown inFig. 2b, in which the conveyor system 20 and the classification device 40 are illustratedfrom an end view.
In an altemative embodiment only the loading conveyor 24 and theinterrnediate acceleration device 26 may be tilted, while the second and third conveyors25, 27 are aligned in a plane being parallel with a horizontal plant. In a yet furtherembodiment, only the loading conveyor 24 is tilted, while the interrnediate accelerationdevice 26 and the second and third conveyors 25, 27 are aligned in parallel with ahorizontal plant.
In further embodiments the loading conveyor 24 is tilted by a first tilt angle (11,the interrnediate acceleration device 26 is tilted by a second tilt angle (12, the secondconveyor 25 is tilted by a third tilt angle (13, and the third conveyor 27 is tilted by afourth tilt angle (14,wherein (11 2 (12 2 (13 2 (14. In a preferred embodiment, (11 = (12 = (13 =(14.
By tilting at least the loading conveyor 24 the articles are sliding downwardsby means of gravity until they reach one lateral side 28, the side to which the conveyorsystem 20 is tilted downwards, of the loading conveyor 24. The tilting angle (1 ispreferably between 5° and 25°, and more preferably 10°. A sliding surface is providedat the lateral end 28 for preventing articles from falling out from the conveyor 24. Thesliding surface is preferably made of Teflon, or other similar low-friction material. Oncethe articles are aligned in the transversal direction, the lateral position will bemaintained throughout the conveyor system 20.
A major advantage associated with tilting at least the loading conveyor 24 forplacing the articles is that the components and sensors of the classification device 40may be arranged at fixed locations and still be able to identify the article correctly.
Should the articles be randomly distributed across the width of the second conveyor 25the components and sensors of the classification device 40 must be movable dependingon the position of the article. By having the components and sensors on fixed locationsthe classification device 40 may be made less complex and less expensive, and theaccuracy of deterrnining article identities will further be improved.
Fig. 3a and Fig. 3b show a classification device 40 according to oneembodiment, where the classification device 40 comprises substantially the samecomponents, sensors and controllers as is described in WO 2012/005659 by the sameapplicant.
According to an embodiment, the classif1cation device 40 comprises a weightsensor 4l for weighing the article, being incorporated in the third conveyor 27, amemory unit 42 comprising information of one or more articles, a processor 43connected to the memory unit 42 and to the weight sensor 4l, and at least onespectroscopy sensor 44, from here on denoted as a NIR or a VIS sensor 44 dependingon the associated wavelength interval, connected to the processor 43. The NIR and/orVIS sensor is arranged at a lateral end of the second conveyor 25 and is facing towardsthe articles passing.
The NIR or VIS sensor 44 detects a reflection spectrum from an article,whereby the processor 43 is configured to match the measured reflection spectrum witha database of reference spectrums, whereby each reference spectrum is associated with aunique article identity. Hence, different articles will provide a unique reflectionspectrum whereby an accurate identification may be achieved for articles not carrying abar code.
The NIR or VIS sensor 44 must thus be capable of detecting the reflectionspectrum for a wide variety of articles having different dimensions. For example, sucharticles include both small packages of chewing gum as well as larger articles, such aslarge packages of toilet paper, diapers, etc. In order to be able to measure such referencespectrum in a reliable manner the NIR or VIS sensor 44 is preferably arranged on asupport, which support is configured to be moveable such that the NIR or VIS sensor 44may be directed towards the article passing. Hence, a first sensor, such as a camera, isconf1gured to provide information corresponding to the dimensions of the article. Theinformation is transmitted to the processor 43, which then calculates a correct angle ofthe NIR or VIS sensor 44, i.e. an angle relative the horizontal plane. If the article is verysmall, such as the chewing gum, the NIR or VIS sensor 44 is directed towards theconveyor belt 25, i.e. downwards. Should the article be large, such as a package ofdiapers, the NIR or VIS sensor 44 will be directed upwards.
As already discussed briefly above, the memory unit 42 comprises one or moredigital signatures created by the at least one spectroscopy sensor 44, wherein each oneof said signatures is associated to a corresponding article identity. A benefit of theclassification device 40 is that the checkout counter 10 automatically may identify allsorts of articles without any need for the customer to identify the article before thecheckout counter, e.g. with a barcode. The NIR or VIS sensor 44 is particularly valuablefor identifying fruit and vegetables, and certain types of bulk articles, since thesearticles have previously required the customer to mark the article with a bar code due tothe fact that sensors using cameras and image processing have not been able todetermine the article identity accurately enough.
The third conveyor 27, including the scale 41, is configured to detect theweight of the article and transmit such information to the processor 43. This allows fortwo advantages, namely i) to provide a correct pricing for such articles which are pricedbased on the weight, and ii) to prevent fraud, in case a customer tries to replace thebarcode of an expensive article with a barcode of a cheap article. For example, should abarcode of a cheap magazine be placed on an expensive piece of meat, the weightsensor 41 may in fact be used to compare the weight of the article with a referenceweight stored in the memory 42. Hence, such fraud will be detected and an alarm maybe triggered.
The identity of the article may be deterrnined by matching a measuredsignature to a database comprising properties of a plurality of articles. The database maybe stored in the memory unit 42 and examples of properties are reflection spectrum,weight, size, color, shape, contour, barcode pattems and/or text and/or figure and/orpattem.
The display unit 60 may be connected to the processor 43 for displaying atleast one article identity. The display unit 60 is preferably arranged for use by acustomer for approving the displayed information. If the first NIR or VIS sensor 44identif1es the article, an image or a text is shown in the display unit 60 and if the userfinds the displayed inforrnation matching the article which presently is in the checkoutcounter 10 the customer may approve the identity by manual input. Further informationmay be displayed, e. g. weight and price, wherein the user may approve the displayedinformation if it is correct.
According to one embodiment the checkout counter 10 may, as a complimentto the first NIR or VIS sensor 44 and the weight sensor 41, be provided with one orseveral further sensors which, if used according to the invention, brings out theadvantage of increasing the security when identifying the article, but with a minimumuse of resources and time and energy. It should be mentioned here that an article shouldpreferably be identified in less than one second for an automated checkout counter to beconsidered as user friendly by the customers.
The classification device 40 may further use a further sensor being selectedfrom the group consisting of: an additional spectroscopy sensor (not shown), a contoursensor 48, a barcode reading system 49, a symbol reading sensor 50, a color texturesensor 51, a color histogram sensor 52, or an object sensor 53. The contour sensor 48,the symbol reading sensor 50, the color texture sensor 51, the color histogram sensor 52,and the object sensor 53 may all be implemented by one or several cameras which isconnected to the processor 43, which processor 43 is configured to provide a specificimage computing algorithm for extracting the required information from the image.
As can be seen in Fig. 3b the bar code reading system 49 comprises one ormore readers. One reader 49 may be arranged at a lateral end of the second conveyor 25thus scanning inwards towards the articles passing. Further, additional bar code readersfor creating a complete coverage of the articles may be provided. Hence, an upper,lower, left, right, front, and back side of the article could thus be scanned by the readers49 indicated in Fig. 3a. In a particular embodiment, a bar code reader is positionedunder a slit formed between the second conveyor 25 and the third conveyor 27 andscanning upwards, such that a bar code becomes visible when it moves between theconveyors 24, 25.
In a preferred embodiment, two more bar code readers 49 are provided abovethe second conveyor 25 and facing downwards. These readers 49 may have differentfocus, such that one of these readers 49 are configured to detect barcodes arranged at adistance of approximately 0 - 2 cm above the conveyor belt 25, while the other isconfigured to detect barcodes arranged at a distance larger than 1,5 cm above theconveyor belt 25.
As can be seen in Fig. 3b, the loading conveyor 24, the interrnediateacceleration device 26, the second conveyor 25, and the third conveyor 27 are aligned inparallel.
The processor 43 is further configured to control the operation of the loadingconveyor 24, the interrnediate acceleration device 26, the second conveyor 25, and thethird conveyor 27.
As an example, a rounded article, such as a melon, may be subject toidentification by the classification device 40. Due to its round shape it will most likelynot lay still as it is accelerated by the second conveyor 25. Hence the movement will notbe accepted by the third conveyor 27 when weighing the article. The processor thusdetects the movement, e. g. by the camera 48, 50, 51, 52, 53, whereby the processorstops the driving mechanisms of the third conveyor belt 27. In order to ensure that onlyone article at the time is passing through the classification device 40 the processor 43also stops the movement of the loading conveyor, the interrnediate acceleration device26, and the second conveyor 25. Once the article has stopped its movement, the scale 41may measure an accurate weight and the processor 43 thus commands start of theconveyors 24, 25, 27 as well as of the interrnediate acceleration device 26.
Now tuming to Fig. 4a-c, different embodiments of the interrnediateacceleration device 26 will be described. The main purpose of the interrnediateacceleration device 26 is to provide a separation of articles when they are acceleratedfrom a first speed, defined by the loading conveyor 24, to a second speed, defined bythe speed of the second conveyor 25. As already been described, the interrnediateclassification device 26 may comprise two rollers which are driven by one or twoelectrical motors at a speed between the speed of the loading conveyor 24 and the speedof the second conveyor 25.
The interrnediate acceleration device 26 may also be implemented as only oneroller, which may be driven by an electrical motor. In case of one roller only, it is alsollpossible to allow the roller to rotate freely whereby articles may be accelerated over theroller as the second conveyor increases the speed of the article, while a part of thearticle is still in contact with the roller. In those embodiments where the interrnediateacceleration device 26 is forrned by one roller only, the roller may be spaced apart fromthe loading conveyor 25 and/or from the second conveyor 27 such that a small slit isforrned between the roller and at least one adjacent conveyor 25, 27.
In Fig. 4a another embodiment is shown, wherein the interrnediate accelerationdevice 26 includes four rollers 26a. These are arranged in series. One or several of therollers 26 may be driven by electrical motors, and the speed may be the same for allrollers. In another embodiment, the speed of the rollers 26a is increasing in the directionof movement. Hence, the first roller 26a arranged adj acent to the loading conveyor 24may have a speed which is lower than the speed of the roller 26a being arrangedadj acent to the second conveyor 25.
In Fig. 4b another embodiment is shown, wherein the interrnediate accelerationdevice 26 includes two or more driven rollers 26a which are connected by severalendless strips 26b. Hence, the strips 26b forms a surface onto which the article may restupon, whereby such configuration allows the rollers 26a to be separated from eachother.
A yet further embodiment is shown in Fig. 4c, wherein the interrnediateacceleration device 26 is forrned by an endless belt 26c. Here, the length of the belt 26cis substantially less than the width of the belt 26c.
A general principle of the conveyor system 20 is to provide transport of articlesthrough a classification device, whereby the articles are separated from each other andwherein the lateral position of each article is fixed.
Hence, the loading conveyor 24, the interrnediate acceleration device 26, thesecond conveyor 25, and the third conveyor 26 is preferably equipped with a surfacehaving a suff1cient friction in order to prevent the articles from sliding. Especially, theinterrnediate acceleration device 26 should have a friction which is at least equal to thefriction of the loading conveyor 24. Correspondingly, the friction of the secondconveyor 25 should be at least equal to the friction of the interrnediate accelerationdevice 26.12It should be appreciated that even though nunierous Characteristics andadvantages of the present invention have been set forth in the foregoing description,together With details of the structure and function of the invention, the description isonly illustrative and changes may be n1ade in detail, especially in n1atters of shape, sizeand arrangen1ent of parts Within the scope of the invention to the full extent indicated bythe appended clainis.
权利要求:
Claims (11)
[1] 1. A conveyor system for transporting articles in a Checkout counter,comprising a loading conveyor (24) on which articles may be placed by a customer, a second conveyor (25) arranged in series with the loading conveyor (24)which second conveyor (25) is operated at a higher speed than said loading conveyor(24) for increasing the distance between adj acent articles, wherein the loading conveyor (24) is tilted with respect to a horizontal plane in a lateraldirection, and wherein said conveyor system further comprises an interrnediate acceleration device (26) being arranged between the loadingconveyor (24) and the second conveyor (25) for accelerating the articles when moving from the loading conveyor (24) to the second conveyor (25).
[2] 2. The conveyor system according to claim 1, wherein the interrnediateacceleration device (26) is configured to rotate around an axis being arranged in parallel with the lateral extension of the loading conveyor (24).
[3] 3. The conveyor system according to claim 1 or 2, wherein said interrnediate acceleration device (26) comprises a plurality of rollers (26a) being arranged in parallel.
[4] 4. The conveyor system according to claim 3, wherein the plurality of rollers(26a) are arranged at a distance from each other thus forrning a slit between each roller (26a).
[5] 5. The conveyor system according to anyone of the preceding claims, whereinthe loading conveyor (24), the second conveyor (25) and the interrnediate acceleration device (26) are tilted by the same angle.
[6] 6. The conveyor system according to claim 5, wherein the angle is within the range of 5-25°. 14
[7] 7. The conveyor system according to any one of claims 1-4, Wherein theloading conveyor (24), the second conveyor (25) and the interrnediate acceleration device (26) are tilted by different angles.
[8] 8. The conveyor system according to any one of claims 8, Wherein the tiltingangle of the loading conveyor (24) is higher than the tilting angle of the second conveyor (25).
[9] 9. The conveyor system according to any one of the preceding claims, Whereinone lateral end (27) of the loading conveyor (24) is arranged adjacent to a sliding surface, Which sliding surface is tilted 90° relative the loading conveyor (25).
[10] 10. An automatic checkout counter comprising a conveyor system (20) according to any of the preceding claims.
[11] 11. The automatic checkout counter according to claim 10, further comprisinga classification device (40) for identification of articles Which are moving along said conveyor system (20), Wherein said classification device (40) comprises at least one spectroscopy sensor (44) being arranged at one lateral end of said second conveyor (25).
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同族专利:
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EP3054815B1|2019-11-06|
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EP3054815A1|2016-08-17|
SE537684C2|2015-09-29|
CN105611859A|2016-05-25|
WO2015053688A1|2015-04-16|
EP3054815A4|2017-05-31|
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法律状态:
优先权:
申请号 | 申请日 | 专利标题
SE1351194A|SE537684C2|2013-10-09|2013-10-09|A conveyor belt system for a check-out counter|SE1351194A| SE537684C2|2013-10-09|2013-10-09|A conveyor belt system for a check-out counter|
CN201480055654.2A| CN105611859B|2013-10-09|2014-10-03|Conveyor system for checkout counter|
CA2924878A| CA2924878A1|2013-10-09|2014-10-03|A conveyor system for a checkout counter|
US15/027,062| US9505561B2|2013-10-09|2014-10-03|Conveyor system for a checkout counter|
EP14851462.3A| EP3054815B1|2013-10-09|2014-10-03|A conveyor system for a checkout counter|
PCT/SE2014/051151| WO2015053688A1|2013-10-09|2014-10-03|A conveyor system for a checkout counter|
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