EP3541727A1 - Method and device for detecting faults during object transport - Google Patents
Method and device for detecting faults during object transportInfo
- Publication number
- EP3541727A1 EP3541727A1 EP17829155.5A EP17829155A EP3541727A1 EP 3541727 A1 EP3541727 A1 EP 3541727A1 EP 17829155 A EP17829155 A EP 17829155A EP 3541727 A1 EP3541727 A1 EP 3541727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transport
- objects
- image recording
- containers
- container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/02—Articles
- B65G2201/0235—Containers
- B65G2201/0244—Bottles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/02—Control or detection
- B65G2203/0208—Control or detection relating to the transported articles
- B65G2203/0225—Orientation of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/04—Detection means
- B65G2203/041—Camera
Definitions
- the present invention relates to a method and apparatus for detecting disturbances in object transport. From the prior art and in particular in the field of beverage manufacturing industry a variety of transport facilities are known. It is also known, among other things, that objects - in particular containers - are conveyed on a conveyor belt or a transport chain. In this case, there is usually a plurality of containers on this conveyor belt and is moved or transported by this. The invention will be described below with reference to a container transport. Also, some of the embodiments of the invention are particularly suitable for such container transport. It should be noted, however, that the invention can also find application in the transport of other objects - for example, on conveyor belts or transport chains.
- a plurality of these objects are transported in a predetermined orientation of these objects along a predetermined transport path by means of a transport device, the objects being transported at least partially adjacent to each other and the objects being on a movable surface the transport device are located.
- At least one region is accommodated by means of at least one first image recording device, in which a plurality of the transported objects (for example containers) are located and at least one subregion of this region is identified in which no object is in the predetermined orientation. Furthermore, a distinction is made as to whether there is an object with an orientation that deviates from the given orientation or a blank space in this area.
- a distinction is made as to whether there is an object with an orientation that deviates from the given orientation or a blank space in this area.
- the said objects are containers and in particular plastic containers. It is advantageous containers which have an at least partially flexible outer wall, thus in particular to plastic containers.
- at least one image recording device is used, which permits a three-dimensional image evaluation and / or enables an output of images with depth information (or corresponding image data).
- an image evaluation device can also be provided, which also outputs depth information on the basis of recorded images, possibly using certain boundary conditions.
- an image recording device outputs not only the usual two-dimensional information, but also information about the distance of the recorded object to the image recording device.
- the penetration depth it would be possible for the penetration depth to be determined on the basis of known distances.
- the ratio of a distance of the image pickup device to the carrier tape may be set in relation to the container diameter.
- a two-dimensional camera could be used and from the image analysis of this camera could be closed to appropriate distances or proportions.
- a distance between the at least one image pickup device could be changed, for example, a measuring bridge, on which the image pickup device is arranged, be movable in height.
- an image pickup device which not only enables a two-dimensional resolution of a captured image but also outputs information about the distance of a picked-up object from the image pickup direction.
- various methods and devices are known in the prior art.
- a 3D camera is used as the image recording device.
- 3 D cameras are camera systems that also allow a (pictorial) representation of distances of an image or an entire scene.
- 3 D cameras are used on the one hand to give the viewer a spatial impression (especially stereo systems). For another, they will, as in the case of present invention for the measurement or control / automation needed. Different systems can achieve a 3D image of their environment.
- the image recording device is preferably selected from a group of image recording devices which contain stereo cameras, triangulation systems, TOF systems (which make transit time measurements), interferometry systems, image processing devices evaluating shadow throws, or image recording devices with an additional or alternative ultrasound measuring device.
- image recording devices which contain stereo cameras, triangulation systems, TOF systems (which make transit time measurements), interferometry systems, image processing devices evaluating shadow throws, or image recording devices with an additional or alternative ultrasound measuring device.
- stereo cameras the environment is recorded simultaneously with two cameras.
- the distance between the camera lenses for example, corresponds to the human eye distance.
- the resulting image pair can be transmitted to the eyes of the viewer or an image analysis separately.
- the images can also be processed in the evaluation device and thus the distance to objects can be measured.
- a light source images a defined pattern on the object.
- An image capture device and in particular a camera, picks up this pattern from a different angle and calculates the distance from the distortion.
- TOF cameras or TOF systems perform time-of-flight measurements of the light (e.g., for each pixel individually). This makes it possible to draw on a distance.
- An example of such a TOF image pickup device is a PMD (photo mixing device) sensor.
- Interferometric systems use the interference between a measuring and an object beam.
- very short wavelengths are preferably used. Due to these very short wavelengths, the smallest distance resolutions can be achieved with such systems.
- a detection device in the form of a volume scanner could be designed in particular as a laser scanner, which detects at least the volume of an article in a partial area of a room and in particular of a room above the transport level. It prefers to cover Detection range of the detection device from a width of the transport plane.
- the width of the transport plane can be, for example, the width of a conveyor belt, which transports the objects. In general, it is preferred if a detection range of the detection device is located vertically above the transport plane. In this way, an undistorted recording of images is possible in particular.
- the objects are transported over a width direction of the transport device without intermediate walls, that is not, as in the prior art partially usual in separate lanes which extend in the transport direction.
- the transport device On the device side, therefore, the transport device is designed to be free of wall and / or barrier-free in a direction perpendicular to the transport direction and / or at least two containers are conveyed to one another in a direction perpendicular to the direction of transport.
- At least one object is removed from the transport path or the transport stream by means of a fault elimination device.
- This troubleshooting device can in particular be a robot device which is suitable for removing individual objects and, in particular, containers from the object or container stream.
- this troubleshooting device is selected from a group of troubleshooting devices including robots with suction arms, tripods, movable arms, quadcopters, and the like.
- an error signal to be output in response to a detected error and / or the relevant system to be stopped (in particular by means of a machine stop), at least temporarily.
- this fault elimination device is controlled on the basis of data and / or information output from the image pickup device.
- a trouble removal device such as a suction robot can be set more precisely to the required depth.
- the ro- Boter seen be made simpler, for example, requires a not too long bellows.
- the image recording device described here can also be used to detect topographies of the respective container. This can be helpful in order to control the fault elimination device accordingly.
- the fault elimination device can be specifically controlled so that it does not grip a container in an orifice area in which a support ring is located.
- the disturbance removal device can be controlled approximately such that a suction cup or suction head does not touch the horizontal support rings of the containers (whereby suction power would be lost). This in turn has the advantage that the suction cup does not have to be designed so soft or sensitive.
- the fault removal device has a suction device which is suitable and intended for sucking objects, in particular containers and in particular containers to be discarded.
- the fault elimination device is controlled such that it detects and / or receives the container in a region of its center of gravity. In this way it can be achieved that the containers can be detected with relatively little effort.
- a suction head it is preferred to use only a relatively low negative pressure.
- the objects are transported in a straight-line direction.
- the transport device has a circulating transport element and particularly preferably a circulating transport belt or a circulating transport chain.
- several containers are transported side by side in a direction perpendicular to the direction of transport.
- the objects and in particular the containers are transported in a pulp or a container stream.
- the transported containers are already filled and / or already closed containers.
- the containers are preferably transported in a disordered pulp, that is to say a pulp which has no predetermined geometric orientations between the individual containers.
- the fault is selected from a group of containers which detects fallen-over containers or containers with incorrect alignment or empty spaces in the container stream.
- these are voids that are larger than a cross section of a single container.
- other disturbances could also be detected, such as bursting conditions.
- the predetermined orientation of these containers is an upright orientation of the containers.
- the different orientation of the containers is in particular a fallen-down container, i. a container whose longitudinal direction is now parallel to the transport plane of the transport device.
- a plurality of image receiving devices which are arranged in a direction perpendicular to the direction of transport behind one another or next to each other, several areas of the container stream are recorded.
- the image recording devices are photo or video cameras. These can record spatially resolved images of the respective areas.
- the entire area of the transport device or the area over its entire width can be monitored.
- the container flow is completely monitored in this direction perpendicular to the transport direction.
- the observation regions of at least two of these image recording devices preferably overlap, and the observation regions of several image recording devices particularly preferably overlap. In this way it can be ensured that the entire container pulp is monitored.
- at least one of these image pickup devices is arranged stationary relative to the transport device.
- the above-mentioned image pickup devices are arranged stationary relative to the transport device.
- at least one of the image recording device is arranged above the containers or above their transport path. In this way, the at least one image recording device preferably picks up images of the container pulse from above.
- a lighting device is provided, which illuminates the container pulp, in particular for taking pictures by means of the image recording device.
- this lighting device is also arranged above the transport path of the containers.
- a detected malfunction is remedied.
- an incorrectly oriented container is discharged from the object stream and / or a blank space is filled with at least one further object.
- a faulty oriented object is aligned in a desired orientation, for example, a fallen down container is placed.
- a gripper could be provided, which alternatively receives a folded container or inserts a container into a gap.
- a sensor system for example the above-mentioned image recording devices-whether an error situation exists, for example a gap is present which has a minimum area of a container height multiplied by the container diameter. This is the area of the overturned container in plan view. This can be done for example on the basis of an evaluation of bottle caps, as described in more detail below.
- at least one image recording device is aligned with a surface of the transport device, for example on the conveyor belt. In this case, for example, a focus on this conveyor belt done. By this focusing can be determined both, if in a range is a gap or a void, because then the conveyor belt itself is recognizable. It is also possible to detect a fallen container in this area, since this is at least partially displayed. With proper proper transport, ie in an upright container, this is out of focus of the image pickup device.
- a check is made as to whether an object in an orientation that deviates from the predetermined orientation (such as an overturned container) or on
- the second image pickup device is aligned with the transport device or the conveyor belt itself.
- an at least two-stage method is proposed here in which the occurrence of a specific error is initially detected by means of a first image recording device and preferably a type of error by means of a second image recording device, which is arranged in the transport direction of the objects after the first image recording device is determined.
- this second image recording device can also be used for the purpose of controlling a fault elimination device which is intended to eliminate the fault in question.
- the second image recording device is movable in a direction perpendicular to the transport direction. It is possible for this second image recording device to be displaced relative to the container stream.
- said subregion is determined geometrically.
- an image recording device detects, for example, a partial area in which there are no properly aligned containers.
- This subarea is now geometrically determined, for example, determined in terms of its boundaries. In this way, it is also possible to conclude, for example, based on a geometric shape of this subarea, whether there is a container or only a gap within this subarea. For example, a longitudinal extent of a white space can be determined by a corresponding image evaluation. If this longitudinal extent is smaller than the height of a container, it can be assumed that there is rather no overturned container in this area.
- This exact determination of the subarea is preferably forwarded to a control device, so that a corresponding countermeasure can be taken, for example, a container can be removed from this subarea or a container can be erected from this subarea again.
- a control device can also give a signal to the transport device for stopping it. In this case, during a standstill of the transport device, a fallen container can be removed from the belt or set up again. In addition, an alarm can be issued to the machine operator or the request to take a fallen container from the transport device.
- At least one image recording device is suitable and intended to detect certain characteristic elements of the containers, for example their container closures. Based on the container closures can be concluded that the containers are, for example, properly transported on the transport device.
- the check is made as to whether there is any empty space, based on an evaluation of the container closures. If an area results without recognizable closures, it can be concluded from this that a specific error has occurred. This information can be forwarded to a fine recognition, which then checks this area in more detail. Within the scope of this coarse identification, it can not yet be determined in this preferred method whether a gap, i. an area where there is no container or an overturned container. The determination on the basis of the container closures only permits a statement as to whether there are any container closures in a certain area.
- the second image pickup device which is preferably carried out movable to, the checking area transmitted.
- This transmission can be done for example by a division into sub-areas.
- this transmission takes place immediately following the said coarse identification in order to avoid uncontrolled error propagation.
- the system moves to this area and only looks at it to see if it really has a fallen box or just a gap.
- a sensor can only test in depth and not on the locking level. If a fallen or defective container detected, this can optionally be discharged or placed.
- a gripping device with an integrated camera device can be provided.
- the number of sensor systems or the evaluation range depends on the sensor technology and the transport bandwidth. In the following figures, three areas have been exemplified.
- the method is preferably distinguished immediately with only one sensor system, whether a fallen container or a gap in the container stream is present.
- the system is preferably aligned and / or focused on the transport device or the conveyor belt. If a gap is detected, it can be ignored or else filled via a subsequent system. Fallen or defective containers are discharged or set up via a subsequent system.
- the image recording device has a focusing device and in particular an autofocusing device.
- a 3D camera to be used as the image recording device, which also outputs information about distances of the objects to be recorded from the image recording device.
- the image recording device could in particular have a transit time measuring device.
- an exact data transmission ie with regard to the position and orientation, is preferably carried out by the sensor system or the image recording device to the subsequent system.
- a distance between the image recording device and in the following, for example, the gripper system is kept as low as technically possible in order to avoid error propagation and to allow exact gripping in the container.
- image data are also output with a time characteristic which provides information about when the respective image was taken. In this way, it can be determined where a particular disturbance is, for example, a fallen-down container or a void at any later time, so that a disturbance can also be eliminated at a later time.
- the transport device at least partially has a constant width.
- the present invention further relates to a device for detecting disturbances in the context of an object transport with a circulating transport device, which has a transport surface on which the objects to be transported in a predetermined orientation are preferably transportable in a straight line in a predetermined transport direction.
- this transport direction has a width which is determined in such a way that the objects are transported at least partially in a direction perpendicular to the direction of transport and at least partially adjacent to one another and side by side as object stream.
- the device has a first image recording device, by means of which at least one image of a first region of this object stream can be accommodated, a plurality of these objects being located in this region.
- an identification device is provided with which at least a portion of this area is identifiable, in which there is no object and / or no container in the predetermined orientation.
- a partial area is identified by means of optical means in which no objects are present, whether the object is not properly aligned or has fallen over or that there is actually a void in this area.
- the transport surface may be about the surface of a conveyor belt.
- At least one image evaluation device is provided, which is suitable and intended to be distinguished according to whether there is an object with an orientation deviating from the predetermined orientation or a void in this subregion.
- the latter has at least one image recording device which permits three-dimensional image analysis and / or output of images with depth information (or corresponding image data).
- an image evaluation device can also be provided, which also outputs depth information on the basis of recorded images, if necessary using certain boundary conditions.
- a 3D profile can be read line by line for the purpose of evaluation.
- software can be used to split height values of images into different areas.
- overturned containers can be detected if, for example, the pixels at the height of a container lid, pixels at the height of an upper container diameter and pixels at the height of the conveyor belt are initially viewed and / or evaluated. In this way, e.g. Gap arrays (of the pixels) are viewed at different heights.
- algorithms such as the Zhang-Suen algorithm or a Union-Find algorithm can be used.
- the device has a troubleshooting device or troubleshooting device, which eliminates accordingly detected disorders.
- This may be, for example, a troubleshooting device that eliminates fallen containers or also fills in gaps. It would also be possible that overturned containers are reoriented in the container stream.
- the device has a control device, which controls the disturbance elimination device based at least on the basis of data output from the above-mentioned image recording device.
- the device and in particular the fault removal device has a gripping device which is suitable and intended to grip containers. In this case, this gripping device can grip the containers, for example, at the mouth. It would also be possible for the gripping device to grip the containers on their base body.
- this gripping device is at least also in a vertical kalen direction movable.
- a gripping device can be introduced into a gap occurring in the container stream.
- a movement of the gripping device is preferably also synchronized to a transport speed of the containers, so that it is avoided that the gripping device encounters other containers during the gripping process.
- the gripping device it would also be possible for the gripping device to move in sections with the transported objects. In this way, there is no relative movement between, for example, a carrier of the gripping device and the transported containers in the transport direction.
- this fault elimination device is movable and, in particular, also movable transversely to a transport direction of the containers.
- the fault elimination device is synchronized with the transport device, in particular, since the respective detected sub-range mitwandert.
- a plurality of image recording devices are arranged next to one another transversely to a transport direction of the containers. For example, two or three or more image cameras can be arranged next to one another.
- the second image recording device is displaceable or movable transversely to the transport direction of the containers. Furthermore, it would also be possible for this second image recording device to be coupled to a gripping device for gripping the containers.
- a geometric distance between at least one element of the interference removal device and at least one object of the plurality of objects is determined.
- the malfunction removal device and / or the gripping device of the malfunction elimination device particularly preferably has a distance measuring device in order to provide a geometric distance between the malfunction elimination device and / or the gripping device on the one hand and at least an object and in particular a fallen and / or faulty object to determine.
- this distance measuring device is selected from a group of distance measuring devices which contain reflector master devices, ultrasound scanner devices, image recording devices such as, in particular, 3D cameras and the like. If an image pickup device is used, it is preferably operated with low resolution.
- the device has a positioning device which is suitable and intended to position at least one element of the disturbance removal device against at least one of the objects.
- a camera device and in particular a 2-D camera device can be arranged on a gripping device.
- the disturbance remedy is controlled based on data from this 2-D camera device.
- the said 2-D camera can record image data of the transported objects, and based on this image data, the positioning of the disturbance remedy, such as a gripping arm, can be controlled.
- a gripper arm of this disturbance prevention device can be moved into a precisely defined position with respect to the objects.
- FIG. 1 shows a device according to the invention in a first embodiment.
- FIG. 2 shows a device according to the invention in a second embodiment.
- FIG. 1 shows a device 1 according to the invention in a first embodiment.
- This has a transport device 2, which is designed here as a conveyor belt.
- On this conveyor belt is a variety of containers 10 upright. These containers each have container closures 18. This means that these are already closed containers.
- the reference numerals 4a, 4b and 4c identify three image recording devices, which are preferably arranged above the transport path of the containers and therefore take pictures of the transported containers from above. In this case, these image recording devices 4a, 4b, 4c are offset relative to one another in a width direction BR of the transport device. In this way, the entire container flow can be monitored by the three imaging devices.
- These image recording devices preferably have identification devices (not shown) which are suitable for identifying, within the container stream, those regions which do not contain any containers. These identification devices can therefore also be realized as computer programs which evaluate the images taken by the image recording devices.
- the identification devices can search, for example with suitable evaluation mechanisms, for areas within an image in which there are no container closures.
- the image pickup device 4a can be aligned with the region A, the image pickup device 4b with the region B and the image pickup device 4c with the region C. These three regions advantageously overlap so that it is ensured that the entire region of the container pulse is monitored.
- the reference symbols TB respectively denote subregions of the images recorded by the image recording devices in the areas A, B, C, in which there are no upright containers. This can, as shown in the figures, lie on a collapsed container.
- measuring devices may also be provided which measure empty spaces within the container flow and, for example, provide information about its spatial extent.
- These surveying devices can also be designed as computer programs.
- the reference numeral 10a denotes a fallen-over container and the reference numeral 11 denotes a void in the container pulp. Both conditions can be understood as a fault or error.
- the three image pickup devices 4a, 4b and 4c are arranged stationary and observe the container stream. In the embodiment shown in FIG. 1, it is proposed that these three image recording devices first detect imperfections, ie in this case the region in which the overturned container 10a is located. det and the area in which the space is 1 1. However, these three imaging devices can not yet capture what kind of error is present here. In the embodiment shown in FIG. 1 or in the image recording devices shown in the region R1, these image recording devices thus represent a coarse identification of the containers or of the container pulse.
- a second image pickup device 8 is provided immediately after the first image pickup devices 4a, 4b and 4c. This is suitable and intended to identify the respective error. Accordingly, reference character R2 denotes a fine detection area.
- the image recording device it is possible for the image recording device to be focused on the conveyor belt 2 itself. If, for example, the empty space 1 1 reaches the area of the second image recording device 8, it will deliver a direct image of the transport device 2. In this way, it can be stated that in the region of the disturbance 1 1 there is no overturned container, but rather an empty space.
- the reference numeral 12 indicates a disturbance remedy, which may for example be designed as a gripping arm, which can grip the overturned container 10a. This container can be discharged, but it would also be possible that the container 10a is again placed upright on the conveyor belt 2.
- Reference numeral 14 denotes a carrier, on the other hand, both the second image pickup device 8 and the picking device 12 are movable in the width direction BR.
- Such a gripping arm is preferably around at least two axes, preferably around at least three axes, preferably by at least four axes, more preferably by at least five axes, and more preferably by at least six axes pivotable.
- the fault elimination device is designed as a robot having a gripping element which can move in three mutually perpendicular spatial directions and which is preferably also pivotable about at least one axis, preferably about at least two axes.
- This gripping element is preferably movable in any given position in a predetermined region of the transport device.
- the gripping device can also be moved in substantially any positions in a longitudinal direction of the containers transported on the transport device.
- the reference numeral 16 denotes side guide elements, which limit the transport of the containers, so that they are transported between the two side guide elements 16.
- the reference symbol T denotes the transport direction of the containers.
- FIG. 2 shows a further embodiment of a device 1 according to the invention.
- a transport device 2 is provided as well as on this transported container.
- the first image pickup devices 4a, 4b and 4c are provided, which detect not only the immediate presence of a fault, but also the nature of the error.
- the image pickup devices 4a, 4b, 4c can be focused directly on the transport device 2.
- a fault elimination device of the type described above can again be provided.
- the image pickup devices 4a, 4b, 4c may have image evaluators (not shown) which make it possible to discriminate whether or not a void has been generated by a fallen-over container.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016124400.7A DE102016124400A1 (en) | 2016-12-14 | 2016-12-14 | Method and device for detecting disturbances during object transport |
PCT/EP2017/082160 WO2018108782A1 (en) | 2016-12-14 | 2017-12-11 | Method and device for detecting faults during object transport |
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EP3541727A1 true EP3541727A1 (en) | 2019-09-25 |
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EP17829155.5A Pending EP3541727A1 (en) | 2016-12-14 | 2017-12-11 | Method and device for detecting faults during object transport |
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US (1) | US10882701B2 (en) |
EP (1) | EP3541727A1 (en) |
CN (1) | CN110225871B (en) |
DE (1) | DE102016124400A1 (en) |
WO (1) | WO2018108782A1 (en) |
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DE102022100537A1 (en) | 2021-10-11 | 2023-04-13 | Weber Maschinenbau Gmbh Breidenbach | Food processing line and method of operating a food processing line |
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2016
- 2016-12-14 DE DE102016124400.7A patent/DE102016124400A1/en active Pending
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2017
- 2017-12-11 EP EP17829155.5A patent/EP3541727A1/en active Pending
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US20200189855A1 (en) | 2020-06-18 |
CN110225871B (en) | 2022-04-05 |
WO2018108782A1 (en) | 2018-06-21 |
CN110225871A (en) | 2019-09-10 |
US10882701B2 (en) | 2021-01-05 |
DE102016124400A1 (en) | 2018-06-14 |
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