US20150047950A1 - Networked motorized drive roller conveyor - Google Patents
Networked motorized drive roller conveyor Download PDFInfo
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- US20150047950A1 US20150047950A1 US14/468,245 US201414468245A US2015047950A1 US 20150047950 A1 US20150047950 A1 US 20150047950A1 US 201414468245 A US201414468245 A US 201414468245A US 2015047950 A1 US2015047950 A1 US 2015047950A1
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- Prior art keywords
- item
- zone
- drive roller
- conveyor
- networked
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- 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
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- 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
- B65G13/00—Roller-ways
- B65G13/02—Roller-ways having driven rollers
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- 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
- B65G43/10—Sequence control of conveyors operating in combination
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- 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
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/22—Devices influencing the relative position or the attitude of articles during transit by conveyors
- B65G47/26—Devices influencing the relative position or the attitude of articles during transit by conveyors arranging the articles, e.g. varying spacing between individual articles
- B65G47/261—Accumulating articles
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- 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
- B65G2811/00—Indexing codes relating to common features for more than one conveyor kind or type
- B65G2811/06—Devices controlling the relative position of articles
- B65G2811/0673—Control of conveying operations
Definitions
- modular distributed controls don't require hundreds to thousands of feet of wiring from a centralized PLC to each device in the system. With controls located near the control devices, wiring and wiring labor may be reduced. This shortens the time to complete implementation and provides a parallel control capability that minimizes response time issues common to conventional PLC based systems. Because the system is not limited by the speed of a central processor in a PLC, the system can grow without worry of overtaxing a centralized controller. Testing and start-up time is also reduced, as various segments of the system can be installed and tested independent of other segments.
- FIG. 2 is schematic of a card used in connection with the networked MDR conveyor of the present invention
- FIG. 9 is a side isometric view of a second embodiment of a networked MDR conveyor accordance with the present invention.
- One configuration is an interface with an in-motion weigh scale as shown in FIG. 11C , which allows items 11 to be singulated and transported singly over an in-motion weigh scale.
- An identification device such as a bar code scantier or RFID device, is connected directly to a card 20 and provides the method of identification of the item 11 .
- the weight of the item 11 is compared locally, i.e., at a card 20 , with an expected result and a decision is made locally, i.e., at a card 20 , to allow the item 11 to continue along the conveyor system 10 or to be diverted off to a second conveyor in the event the weight of the item 11 is not within a defined tolerance.
- the I/O 23 on the card 20 will be utilized to communicate with the in-motion weigh scale.
- FIG. 11F Yet another configuration is a “+” transfer as shown in FIG. 11F .
- This pre-programmed operation will facilitate an item transfer from one conveyor zone to one of three possible divert points.
- An identification device e.g., a bar code scanner or RFID
- the desired divert location is determined locally on the card 20 and the item 11 is either allowed to continue on or is diverted to one of two other conveyors completing a 90 degree right angle transfer.
- the card 20 processes the timing required to ensure that the item 11 is completely transferred prior to initiating the next decision relating to a subsequent item transfer.
- the card 20 further processes any additional input/output required to signal the transfer device.
- the size of the zones 15 may be smaller than the arrangement shown in FIG. 1 . Accordingly, the spacing of sensors 14 may be varied to accommodate items 11 of various sizes. Referring to FIG. 6 , items 11 of length “L” must be greater than distance “d,” the distance between sensors (and also the length of the zone), in other words, the length of zone 15 , in order to effectively eliminate gaps between items. Alternatively, where the item length “L” is less than distance “d,” in some circumstances it may not be possible to effectively eliminate the gap between an upstream item and a stopped downstream item depending upon the location at which the downstream item is stopped within the downstream zone.
- the zone length can be varied as desired depending on the size of the items to be conveyed. Thus, the zone length may be greater than the item length or less than the item length as desired.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Conveyors (AREA)
Abstract
A motorized drive roller conveyor includes an upstream zone and a downstream zone, with each zone having a drive roller, an idler roller that is driven by the drive roller, and a sensor. The upstream zone and the downstream zone are controlled by a card, which measures a gap between a first item on the conveyor and a second item on the conveyor by beginning a counter when a trailing edge of the first item passes the sensor of the upstream zone and stopping the counter when a leading edge of the second item passes the sensor of the upstream zone to generate a counter value. If the first item is stopped in the downstream zone, the card of the upstream zone causes the drive roller of the upstream zone to advance the second item into the downstream zone for a distance derived from the counter value before stopping the transportation of the second item.
Description
- The present invention relates generally to a networked motorized drive roller conveyor.
- Conventional conveyor control systems utilize a central Programmable Logic Controller (“PLC”) mounted in a central control panel. This type of system requires control devices, e.g., photo-eyes, solenoid valves, and motor starters, to be terminated at the main control panel. A typical control system utilizing a PLC requires several hundred to several thousand feet of control wiring, which requires significant time, labor and money to route and terminate the wiring. In addition, the PLC requires specialized knowledge, e.g., knowledge of ladder logic, and familiarity with the many different interface requirements unique to each manufacturer's product. Moreover, since there is a central controller, response time with respect to the control devices may be increased because the single processor must account for all operations occurring within the system.
- A Motorized Drive Roller (“MDR”) is a conveyor roller with an integrated motor. An MDR is typically configured to drive a plurality of idler rollers, usually by way of urethane belts or chains. The MDR and idler rollers thus define a zone. There is typically one MDR per zone.
- For conveyor systems that utilize MDR technology, networked motor controllers are frequently used to handle basic transport, diversion, and accumulation tasks to move items through a conveyor system. These motor controllers are mounted in close proximity to the MDR rollers and directly interface with the product sensors associated with each MDR. An MDR conveyor system has many advantages over other conveyor technologies, such as lower power consumption, noise reduction, and a decreased need for maintenance.
- Unlike conventional control systems, modular distributed controls don't require hundreds to thousands of feet of wiring from a centralized PLC to each device in the system. With controls located near the control devices, wiring and wiring labor may be reduced. This shortens the time to complete implementation and provides a parallel control capability that minimizes response time issues common to conventional PLC based systems. Because the system is not limited by the speed of a central processor in a PLC, the system can grow without worry of overtaxing a centralized controller. Testing and start-up time is also reduced, as various segments of the system can be installed and tested independent of other segments. It is common practice in existing conveyor systems that use MDR roller conveyor along with associated motor controllers to utilize smaller, localized PLC's distributed throughout the system to handle conveyor operations such as diverting, bar code scanning, RFID communication, label applications, etc. These peripherals typically communicate serially (RS232 or RS485) or via a network protocol such as Ethernet. Having multiple PLCs in this environment creates other undesirable issues as single point diagnostics are difficult to implement.
- The networked, distributed control system of the present invention provides localized controls for various operations, e.g., diverting, bar code scanning, RFID transactions, labeling, etc. The inventive control system can also handle the basic MDR conveyor drive and accumulation responsibilities, which greatly reduces the wiring needed for the system, implementation time, and cost while maintaining a centralized diagnostic capability. Additional capability to allow localized programming as well as status and diagnostics capability are additional benefits of the inventive control system. Eliminating the need for PLCs and associated ladder logic is a further benefit of the inventive design because it reduces the complexity of installation, operation and modification of the control system and corresponding conveyor system.
- As noted above, MDR conveyor systems have many advantages over other conveyor technologies, such as lower power consumption, noise reduction, and less maintenance. However, prior to the present invention, MDR systems lacked the ability to control the size of gaps between items on the conveyor system. Prior art systems are also limited to transporting “Items” that are shorter in length than a single “Zone”.
- Existing technology is typically marketed as “Zero pressure Accumulation” conveyor technology, as items on the conveyor are allowed to accumulate with one item per zone. As such, with control technology currently marketed, items accumulate with varying gaps between items, based on the length of the items.
- In accordance with one aspect of the inventive conveyor control system, a gap control arrangement is used to control gaps between items on the conveyor system. The elimination of gaps between items on the conveyor system is desirable, in that gaps reduce the number of items that can be accumulated on the conveyor, providing lower accumulation efficiency. Thus, reducing or even eliminating gaps between items helps to maximize the accumulation efficiency of the conveyor system. The gap control system incorporates the use of MDR technology and its desirable attributes while at the same time providing the operator with the ability to control the size of the gaps between items on the conveyor system.
- In one embodiment of the invention, a networked motorized drive roller conveyor includes a plurality of motorized drive roller assemblies, where each assembly comprises a zone. The conveyor has a plurality of networked cards, with each card controlling a pair of adjacent zones. The conveyor further has a plurality of sensors for detecting items on the conveyor, with each sensor corresponding to a zone. For a pair of adjacent zones, the corresponding networked card measures a gap between consecutive items on the conveyor by beginning a counter when a trailing edge of a first item passes the sensor of an upstream zone within the pair of zones, and stopping the counter when a leading edge of the second item passes the sensor of the upstream zone within the pair of zones, to generate a counter value. If the first item is stopped in the downstream zone, the networked card causes the motorized drive roller assembly of the upstream zone to move the item into the downstream zone a distance derived from the counter value before stopping the movement of the second item.
- In another embodiment of the invention, a motorized drive roller conveyor includes an upstream zone and a downstream zone. Each zone has a drive roller, an idler roller that is driven by the drive roller, and a sensor. A card controls the upstream zone and the downstream zone. The card measures a gap between a first item on the conveyor and a second item on the conveyor by beginning a counter when a trailing edge of the first item passes the sensor of the upstream zone and stopping the counter when a leading edge of the second item passes the sensor of the upstream zone to generate a counter value. If the first item is stopped in the downstream zone, the card of the upstream zone causes the drive roller of the upstream zone to advance the second item into the downstream zone for a distance derived from the counter value before stopping the movement of the second item.
- In yet another embodiment of the invention, a method for controlling a gap between items on a motorized drive roller conveyor includes the steps of (a) detecting a trailing edge of a first item at a predetermined location in a first zone on a conveyor system; (b) beginning a counter once the trailing edge of the first item passes the predetermined location; (c) stopping the counter upon the first occurrence of the following: (i) a leading edge of a second item is detected at the predetermined location, or (ii) the first item is stopped in a downstream zone adjacent the first zone; and (d) generating a counter value.
- These and other aspects and advantages of the present invention will be made apparent from the following description taken together with the drawings.
- An exemplary embodiment of the invention is illustrated in the accompanying drawings in which like reference numerals represent like parts throughout.
- In the drawings:
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FIG. 1 is an isometric view of a networked MDR conveyor in accordance with the present invention; -
FIG. 2 is schematic of a card used in connection with the networked MDR conveyor of the present invention; -
FIG. 3 is a representation of a physical embodiment of a card used in connection with the networked MDR conveyor of the present invention; -
FIG. 4 is another isometric view of the networked MDR conveyor ofFIG. 1 ; -
FIG. 5 is a schematic side elevation view of a networked MDR conveyor of the present invention; -
FIG. 6 is an enlarged partial isometric view of the networked MDR conveyor ofFIG. 1 ; -
FIG. 7 is a side view of the networked MDR conveyor ofFIG. 1 illustrating gaps between items on the conveyor; -
FIG. 8 is a top view of the networked MDR conveyor ofFIG. 1 ; -
FIG. 9 is a side isometric view of a second embodiment of a networked MDR conveyor accordance with the present invention; -
FIG. 10 is an enlarged partial side isometric view of the networked MDR conveyor ofFIG. 9 ; -
FIGS. 11A-11G are schematic views of various conveyor configurations that may be integrated into a networked MDR conveyor in accordance with the present invention; and -
FIG. 12 is a flow chart illustrating a method of determining the size of a gap between items in the networked MDR conveyor in accordance with the present invention. -
FIG. 1 shows a portion of theconveyor system 10 of the present invention that incorporatescontrol cards 20 in accordance with the present invention. Generally speaking, a number ofitems 11 are supported on theconveyor 10, which includes a plurality ofrollers 13, including MDRs and corresponding idler rollers. Theconveyor system 10 further includes a plurality ofsensors 14 that detectitems 11 as theitems 11 move along theconveyor system 10. Theconveyor system 10 is divided intozones 15. Eachzone 15 is defined betweenadjacent sensors 14. Additionally, eachzone 15 corresponds with an MDR/idler roller assembly. In the inventive system, eachzone 15 is shorter than the length of therespective items 11 being conveyed by theconveyor system 10. -
FIGS. 2 and 3 illustrate a networked, distributedMDR control card 20 with local control capabilities. Accordingly, theinventive card 20 eliminates the need for a central PLC and reduces and/or eliminates the need for wiring associated with a system using a PLC. As a result, implementation and installation costs of aconveyor control system 10 incorporating theMDR control cards 20 of the present invention may also be reduced while, at the same time, providing a more efficient installation and implementation process. Still further, thecard 20 of the present information is programmable, and therefore is able to be reprogrammed depending on its desired utilization. - In the illustrated embodiment, the
card 20 containsdrivers 22, e.g., on a microprocessor, for one or more MDR rollers, which preferably feature a dual brushless motor. More specifically, for zero-pressure accumulation mode of operation, e.g., one in which the items on the conveyor are not intended to contact one another, eachcard 20 will service twozones 15. In other words, thecard 20 will contain drivers for respective MDR rollers inadjacent zones 15. The drivers are adapted to support any variation of MDR roller, e.g. commonly available MDR rollers, e.g., those ranging from 22 watts to 50 watts, may be used. - The
card 20 of the present invention includes a plurality of Inputs and Outputs (“I/O”) 23 for interfacing with various components that are typically utilized in conveyor assemblies, e.g., limit switches, solenoid valves, motor contactors, alarms/buzzers, and status beacons. - The
card 20 further includes a plurality of photo sensor input jacks 24 that connect withsensors 14, which, as discussed above, detectitems 11 that move along theconveyor system 10. For example, foursuch jacks 24 are shown on the block diagram inFIG. 2 ; see also,FIG. 3 . Thecard 20 also includes one or more network jacks 25 to provide network communications capabilities for connection to a supervisory control computer (e.g., a personal computer or industrial computing device). The illustrated embodiment incorporates a CAN network using Can-Open or Device-Net protocols, although Ethernet or serial communications could also be utilized. In this arrangement, anycard 20 in theconveyor system 10 can communicate over the network to anyother card 20 attached to the network or to a supervisory control element, such as a PC or industrial controller. Accordingly, system-wide changes, e.g., relating to product volume, conveyor speed. etc., can be implemented using anycard 20 on the network. - The
card 20 further includes a serial I/O port 26 to facilitate communications with external peripheral devices such as bar code scanners, RFID reader/writer devices, label applicators, in motion weigh scales, or other serial devices. - The
card 20 may also feature anoperator interface display 27. For example, the display may include button switches for interfacing with the module, a high intensity beacon for fault and error notification, and a display element that provides textual and/or graphical information to the operator. An operator interface display allows parameters such as roller speed, acceleration and deceleration rates, delays, etc. to be set locally from anycard 20, rather than from a central point such as a PLC. - In this description, the term “card” is used to describe
item 20, which controls operation of adjacent zones inconveyor system 10. It is understood that the term “card” is used for convenience, and thatitem 20 may be any satisfactory control, device that includes the features and functionality to connect to the sensors and drive rollers of the adjacent zones ofconveyor system 10 and to control their operation. The term “card” is not intended to denote any particular structural or physical characteristics of the control device. - The
inventive conveyor system 10 improves upon existing designs by entirely eliminating the need for a PLC controller for normal conveyor operations. Theconveyor system 10 allows additional functions to be implemented seamlessly without the need for PLCs or any knowledge of ladder logic on the part of the operator or system installer. -
FIG. 11 shows typical configurations that are included in conveyor systems. While typically controlled by a PLC, in theinventive conveyor system 10 these operations are controlled locally by any one or group ofcards 20 in theconveyor system 10. Such typical configurations include but are not limited to the following examples. For example,FIG. 11A shows a zone accumulator andFIG. 11B shows a back-to-back accumulator. - One configuration is an interface with an in-motion weigh scale as shown in
FIG. 11C , which allowsitems 11 to be singulated and transported singly over an in-motion weigh scale. An identification device, such as a bar code scantier or RFID device, is connected directly to acard 20 and provides the method of identification of theitem 11. The weight of theitem 11 is compared locally, i.e., at acard 20, with an expected result and a decision is made locally, i.e., at acard 20, to allow theitem 11 to continue along theconveyor system 10 or to be diverted off to a second conveyor in the event the weight of theitem 11 is not within a defined tolerance. The I/O 23 on thecard 20 will be utilized to communicate with the in-motion weigh scale. - Another type of configuration is an interface with a label applicator or “print and apply” label applicator as shown in
FIG. 11D . This configuration allowsitems 11 to be singulated and transported singly past a labeler, such as an in-motion labeler, static label only, or “print and apply” labeler. An identification device, e.g., a bar code scanner or RFID device, is connected directly to thecard 20 and provides the method of identification of theitem 11. The information required on the label is determined locally on thecard 20. The label is printed (if necessary) and applied and then theitem 11 is passed on to thenext conveyor zone 15. The I/O 23 on thecard 20 will be utilized to communicate with the printer/applicator. - Another type of configuration is a 90 degree transfer as shown in
FIG. 11E . This pre-programmed operation will facilitate anitem 11 transfer from oneconveyor zone 15 to another completing a 90 degree right angle transfer. A correspondingcard 20 processes the timing required to ensure that theitem 11 is completely transferred prior to initiating the next transfer of an item. Thecard 20 further processes any additional input/output required to signal the transfer device. - Yet another configuration is a “+” transfer as shown in
FIG. 11F . This pre-programmed operation will facilitate an item transfer from one conveyor zone to one of three possible divert points. An identification device, e.g., a bar code scanner or RFID, is connected directly to a correspondingcard 20 and provides the method of identification of theitem 11. The desired divert location is determined locally on thecard 20 and theitem 11 is either allowed to continue on or is diverted to one of two other conveyors completing a 90 degree right angle transfer. Thecard 20 processes the timing required to ensure that theitem 11 is completely transferred prior to initiating the next decision relating to a subsequent item transfer. Thecard 20 further processes any additional input/output required to signal the transfer device. - Another configuration is a “T” transfer as shown in
FIG. 11G . This pre-programmed operation facilitates an item transfer from one conveyor zone to one of two possible divert points. An identification device, e.g., a bar code scanner or RFID, is connected directly to a correspondingcard 20 and provides the method of identification of theitem 11. The desired divert location is determined locally on thecard 20 and theitem 11 is either allowed to continue on or is diverted to another conveyor completing a 90 degree right angle transfer. Thecard 20 processes the timing required to ensure that theitem 11 is completely transferred prior to initiating the next decision relating to a subsequent item transfer. Thecard 20 further processes any additional input/output required to signal the transfer device. - The illustrated embodiment includes either a display on the
card 20 or a touch screen type interface on a personal computer or industrial computing device. The touch screen allows a setup operator to easily drag and drop the aforementioned pre-programmed operations to eachcard 20, with no knowledge of programming ladder logic or other programming required. The interface also allows parameters such as speed, timing, direction, etc. to be easily communicated to theindividual cards 20 via the network. - The illustrated embodiment of the
conveyor system 10 also has the ability to retain a backup of eachcard 20 in the system, should a replacement he required because of a card failure. The parameters and standard code blocks can simply be downloaded to thecard 20, greatly minimizing downtime in the event of a card failure. - As discussed above, it is not desirable to have
gaps 30 betweenitems 11 on aconveyor system 10. The gap control system of the present invention uses MDR rollers in conjunction withcards 20 andsensors 14 to control thegaps 30 betweenitems 11. As shown inFIG. 5 , for example, in the illustrated embodiment, anyitem 11 being conveyed is greater in length “L” (measured longitudinally along the direction of flow of the conveyor) than the distance “d” between thezone sensors 14. Thesensors 14 are preferably photo-eye type sensors, but any type of sensor capable of determining the presence of anitem 11 could be used, including, but not limited to, proximity sensors, limit switches, strain gauges, weight measurement devices, imagers, or ultrasonic sensors. - Depending on the nature of the
items 11 being conveyed, the size of thezones 15 may be smaller than the arrangement shown inFIG. 1 . Accordingly, the spacing ofsensors 14 may be varied to accommodateitems 11 of various sizes. Referring toFIG. 6 ,items 11 of length “L” must be greater than distance “d,” the distance between sensors (and also the length of the zone), in other words, the length ofzone 15, in order to effectively eliminate gaps between items. Alternatively, where the item length “L” is less than distance “d,” in some circumstances it may not be possible to effectively eliminate the gap between an upstream item and a stopped downstream item depending upon the location at which the downstream item is stopped within the downstream zone. The zone length can be varied as desired depending on the size of the items to be conveyed. Thus, the zone length may be greater than the item length or less than the item length as desired. -
FIGS. 4-8 show one embodiment of theconveyor system 10 featuring the gap control system of the present invention.FIGS. 9-10 show a second embodiment of aconveyor system 10 featuring the inventive gap control system. - The illustrated embodiment uses brushless DC motors integrated within the MDRs. These motors provide feedback as to the position of the roller, e.g., via Hall effect sensors that are integral with the motor itself. The inventive gap control system utilizes the feedback from the Hall effect sensors to dynamically determine the length of the
gap 30 betweenitems 11 that are transported on theconveyor system 10. - More specifically, as an
item 11 passes asensor 14, thesensor 14 transitions from blocked (i.e., when theitem 11 is triggering the sensor 14) to unblocked (i.e., when theitem 11 is not triggering the sensor 14). Accordingly, as anitem 11 passes asensor 14, a counter is initiated within amicroprocessor 28 on thecard 20. The counter counts the number of pulses received by the Hall effect sensor within an MDR until asubsequent item 11 blocks thesensor 14. In other words, the counter records the number of pulses received from the MDR while noitem 11 was being transported by the MDR, which is a measure of thegap 30 betweenconsecutive items 11. A counter value is calculated and maintained for everysensor 14 in the conveyor system by correspondingcards 20. Thus, as adownstream item 11 approaches a blockedzone 15, the corresponding counter value is used to continue to transport anitem 11 the requisite number of pulses, i.e., the number of pulses stored in the counter value, in order to close thegap 30. This effectively transports theitem 11 right up to the stoppeditem 11, barely touching it, providing zero pressure accumulation as desired. - In addition to the scenario discussed above, i.e., wherein a
sensor 14 detects asecond item 11 after afirst item 11 has passed thesensor 14, there is another scenario in which the counter may be stopped. Specifically, the second scenario occurs when anitem 11 that has passed aparticular sensor 14 is stopped on theconveyor system 10 before asecond item 11 is detected by theparticular sensor 14. In other words, theitem 11 is stopped before thesecond item 11 reaches theparticular sensor 14. Thus, when theitem 11 has been stopped, thecard 20 corresponding to thedownstream zone 15 in which theitem 11 is stopped communicates with thecard 20 corresponding to the adjacentupstream zone 15, which then stops the counter. Accordingly, the counter value represents the distance between the end of the stopped,downstream item 11 and thesensor 14 in the adjacent,upstream zone 15. Thus, thecards 20 communicate with one another such that asubsequent item 11 is moved up to the stoppeditem 11, thus closing thegap 30 between the two items. - The illustrated embodiment also allows the counter value to be converted to a known distance, such that the counter value could be modified to allow the user to select a desired gap distance between
items 11 so thatitems 11 do not touch, but have aminimal gap 30. - The present invention further includes a method for determining a
gap 30 betweenitems 11 on aconveyor system 10. Generally speaking, as shown inFIG. 12 , the method includes the steps of (a) detecting a first edge of a first item at a predetermined location on a conveyor system; (b) detecting a second edge of the first item at the predetermined location on the conveyor system; (c) beginning a counter once the second edge of the first item passes the predetermined location on the conveyor system; (d) stopping the counter once a first edge of a second item is detected at the predetermined location; and (e) generating a counter value based upon the counter data. Accordingly, the counter value represents agap 30 betweenadjacent items 11 on aconveyor system 10. - Additional steps of the method may include using the counter value to eliminate the
gap 30 between theitems 11. For example, the counter value may be used to rotate an MDR a corresponding number of rotations in order to close thegap 30 between theadjacent items 11 in the event that the downstream item. 11 has been stopped on the conveyor system. Moreover, the counter value may be adjusted or converted to a predetermined value so that the size of the gap remains fixed if a gap (preferably minimal) betweenitems 11 is desired. - The method may also include steps to stop the counter when an item has been stopped in a downstream zone. For example, the method may include the steps of (a) detecting a first edge of a first item at a predetermined location on a conveyor system; (b) detecting a second edge of the first item at the predetermined location on the conveyor system; (c) beginning a counter once the second edge of the first item passes the predetermined location on the conveyor system; (d) stopping the counter When the item has been stopped on the conveyor system; and (e) generating a counter value based upon the counter data. Further steps may include using the counter data to rotate an. MDR a corresponding amount of rotations in order to close the
gap 30 between theadjacent items 11. - Various alternatives and modifications are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter regarded as the invention.
Claims (20)
1. A networked motorized drive roller conveyor comprising:
a plurality of motorized drive roller assemblies, each assembly comprising a zone;
a plurality of networked cards, each card controlling a pair of adjacent zones;
a plurality of sensors for detecting items on the conveyor, each sensor corresponding to a zone;
wherein for a pair of adjacent zones, the corresponding networked card measures a gap between consecutive items on the conveyor by beginning a counter when a trailing edge of a first item passes the sensor of an upstream zone within the pair of zones, and stopping the counter when a leading edge of the second item passes the sensor of the upstream zone within the pair of zones to generate a counter value.
2. The networked motorized drive roller conveyor of claim 1 , wherein for a pair of zones, if the first item is stopped in the downstream zone, the networked card causes the motorized drive roller assembly of the upstream zone to move the item into the downstream zone a distance derived from the counter value before stopping movement of the second item.
3. The networked motorized drive roller conveyor of claim 2 , wherein the gap is measured by counting the rotations of a drive roller.
4. The networked motorized drive roller conveyor of claim 3 , wherein the rotations of the drive roller are counted by counting pulses received from a Hall effect sensor within the drive roller.
5. The networked motorized drive roller conveyor of claim 4 , wherein the networked cards are connected to a supervisory control computer.
6. The networked motorized drive roller conveyor of claim 5 , wherein each of the networked cards includes a user interface.
7. A motorized drive roller conveyor comprising:
an upstream zone and a downstream zone, each zone including a drive roller, an idler roller that is driven by the drive roller, and a sensor; and
a card that controls the upstream zone and the downstream zone;
wherein the card measures a gap between a first item on the conveyor and a second item on the conveyor by beginning a counter when a trailing edge of the first item passes the sensor of the upstream zone and stopping the counter when a leading edge of the second item passes the sensor of the upstream zone to generate a counter value; and
wherein if the first item is stopped in the downstream zone, the card of the upstream zone causes the drive roller of the upstream zone to advance the second item into the downstream zone for a distance derived from the counter value before stopping movement of the second item.
8. The motorized drive roller conveyor of claim 7 , wherein the distance is about the length of a gap between the first item and the second item.
9. The motorized drive roller conveyor of claim 7 , wherein the distance is less than the length of a gap between the first item and the second item.
10. The motorized drive roller conveyor of claim 7 , wherein the respective lengths of the first and second items are greater than the length of the upstream zone.
11. The motorized drive roller conveyor of claim 7 , wherein the upstream zone and downstream zone comprise a first pair of a plurality of pairs of zones, the conveyor further comprising a plurality of cards that are in networked communication with one another, each of the cards controlling a pair of zones.
12. The motorized driver roller conveyor of claim 11 , wherein the cards are connected to a supervisory control computer.
13. The motorized drive roller conveyor of claim 12 , wherein the sensors are photo-eye sensors.
14. A method for controlling a gap between items on a motorized drive roller conveyor comprising the steps of:
detecting a trailing edge of a first item at a predetermined location in a first zone on a conveyor system;
beginning a counter once the trailing edge of the first item passes the predetermined location;
stopping the counter upon the first occurrence of the following:
(i) a leading edge of a second item is detected at the predetermined location; or
(ii) the first item is stopped in a downstream zone adjacent the first zone; and generating a counter value.
15. The method of claim 14 , further comprising the steps of:
moving the second item into the downstream zone over a distance derived from the counter value; and
stopping the second item after the distance has been traveled by the second item.
16. The method of claim 14 , wherein the distance traveled by the second item is about the same as a gap between the first and second items,
17. The method of claim 15 , wherein the distance traveled by the second item is calculated by subtracting a predetermined value from the counter value,
18. The method of claim 15 , wherein the method is implemented using a networked card.
19. The method of claim 18 , further comprising the steps of:
receiving user input via the networked card; and
computing the user input with the counter value to derive the distance traveled by the second item.
20. The method of claim 19 , wherein the leading and trailing edges of the items are detected using a photo-eye sensor.
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CN104205135B (en) | 2012-02-05 | 2018-06-19 | 麦修斯资源有限公司 | Order is persistently criticized to fulfil |
US10229383B2 (en) | 2012-02-05 | 2019-03-12 | Matthews International Corporation | Perpetual batch order fulfillment |
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JP6556717B2 (en) | 2013-08-07 | 2019-08-07 | マシューズ リソーシーズ、インク. | Sustained batch order fulfillment |
EP3031009A4 (en) | 2013-08-07 | 2017-09-27 | Matthews Resources Inc. | Conveying systems and methods of associating data with an item transported by a conveying system |
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2011
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2014
- 2014-08-25 US US14/468,245 patent/US20150047950A1/en not_active Abandoned
-
2015
- 2015-10-22 US US14/920,284 patent/US20160185532A1/en not_active Abandoned
-
2017
- 2017-10-31 US US15/799,817 patent/US10160607B2/en active Active
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2018
- 2018-12-21 US US16/230,304 patent/US10549920B2/en active Active
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2020
- 2020-01-07 US US16/735,900 patent/US11440743B2/en active Active
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2022
- 2022-09-12 US US17/942,351 patent/US11987451B2/en active Active
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020163888A1 (en) * | 2019-02-15 | 2020-08-20 | Tgw Mechanics Gmbh | Conveyor device for the distanceless and pressureless, or low-pressure, accumulation of objects, and operating method therefor |
US11745953B2 (en) | 2019-02-15 | 2023-09-05 | Tgw Mechanics Gmbh | Conveyor device for the distanceless and pressureless, or low-pressure, accumulation of objects, and operating method therefor |
EP4234455A3 (en) * | 2019-02-15 | 2023-10-18 | TGW Mechanics GmbH | Conveyor device for the distanceless and pressureless, or low-pressure, accumulation of objects, and operating method therefor |
Also Published As
Publication number | Publication date |
---|---|
US20120024669A1 (en) | 2012-02-02 |
US20200140203A1 (en) | 2020-05-07 |
US10160607B2 (en) | 2018-12-25 |
US20180273305A1 (en) | 2018-09-27 |
US20190291965A1 (en) | 2019-09-26 |
US11987451B2 (en) | 2024-05-21 |
US20230249918A1 (en) | 2023-08-10 |
US11440743B2 (en) | 2022-09-13 |
US10549920B2 (en) | 2020-02-04 |
US20160185532A1 (en) | 2016-06-30 |
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