METHOD OF SORTING GOODS AND SYSTEM THEREFOR

Abstract: The invention relates to a method of sorting goods and system therefor, and more particularly to an efficient method of sorting goods which arrive in the unit of items into groups which have been determined in advance in the order of delivery in a prescribed quantity so as to allow sequential loading of goods in a truck or the like in first-in-last-out manner depend­ ing on the item and quantity for a destination and/or a number of destinations, and to deal with changes in orders which fre­ quently occur. The system applicable to this method includes plural as­ sembling and storage conveyors (1A, 1B, 1C) for assembling goods in classified groups, a diverting conveyor (7, 17) which sorts out goods arrived in the unit of items into said assem­ bling and storage (1A, 1B, 1C) and a control system (201-204) which controls said diverting conveyor (7, 17) and said sorting out operation.

Description: The invention relates to a method for sorting a predetermined quantity of goods substantially in the order of delivery by forming groups of goods to be loaded into a container and a system for sorting goods according to the method. From US-A-3 682 340 a method for sorting goods is known according to which items of one kind (for instance cigarettes) are taken in an amount according to an order by somebody from bins and put into a box, and items of another kind (for instance cigars) are taken in an amount according to the same order by the same or another person from other bins and put into another box. The two boxes are put onto a conveyor and are handled substantially simultaneously until they are stored in a truck or the like. Since the different kinds of items are put into different boxes there may exist a great deal of non-used space because the boxes are only filled according to one order and depending on that order are more or less occupied by items. Methods for sorting out goods and systems therefor are known for instance from the Japanese Patent Applications laid-open Sho 55-16868 and Sho 61-2612. Japanese Patent Application laid-open Sho 55-16868 teaches, in summation, a sorting out system which comprises a trolley conveyor positioned in a manner to run along an oval loop track between sorting chutes, a conveyor for empty tote boxes and a conveyor for tote boxes filled with goods, traversers mounted on said trolley conveyor at least in a number of said chutes and provided with wheels of castor type, and a pool bucket comprising buckets on said traversers. Japanese Patent Application laid-open Sho 61-2612 teaches a method for sorting out goods comprising the steps of carrying goods which have arrived on a conveyor by the first sorting conveyor to plural first-storage conveyors while sorting the goods out, taking out thus roughly sorted out goods on the first circuit conveyor to a second sorting conveyor which is provided either above or below said first sorting conveyor in parallel thereto, sorting the goods for the second stage while conveying them on the second sorting conveyor and moving them further to plural second storage conveyors, taking thus twice sorted goods on the second circuit conveyor in the unit of one second storage conveyor and then forwarding them to loading stations for trucks. However, the prior art method and system are detrimental in the following: The system disclosed in Japanese Patent Application laid-open Sho 55-16868 could sort out goods but could not sort them out in accordance with the order of delivery by trucks. The method disclosed in Japanese Patent Application laid-open Sho 61-2612 could load goods on a truck in the order of first-in-last-out so that on the way of transporting by a truck, they can be unloaded in the unit of destinations such as a city, town, village, etc., however, the method requires the first and second sorting steps as well as conveying steps to the loading stations for trucks, and those steps cannot be conducted simoultaneously. Therefore, the capacity of sorting out is so inferior that the method cannot load goods on a truck as timely and quickly as desired. An object of this invention is to eliminate those problems encountered in the prior art, and to provide a method for sorting out goods which cannot only sort out goods sequentially in a manner to allow loading on a truck or the like consecutively in the order of first-in-last-out in accordance to the number of destinations for one delivery, items of goods for each destination and quantity thereof but also can sort goods efficiently in a manner to deal with changes in orders which may occur for every delivery by taking out goods for several truck loads at one time and sorting them for first-in-last-out for each truck and a system therefor. The method of sorting goods according to the invention is characterized in that the container to be loaded is segmented into volume segments able to take up the largests of said goods in length and/or width and for each segment one group of different goods is formed in advance via the control of a control system which receives respective instructions concerning the order of delivery, the amount and size of goods to be delivered and the so formed groups are then loaded in their order of delivery, the order of goods within each group being determined by the length and/or width of said goods, the goods of larger length and/or width being placed in lower layers. The amount of goods is preferably determined for each group in a manner of making the number in each group substantially equal to each other depending on the number of groups which have been formed in advance. A system for sorting goods according to this method is characterized in that it comprises plural assembling and storing conveyors which form assembly groups of said goods, at least one diverting conveyor which diverts the different goods into said assembling and storage conveyors, and the control system which controls said diverting conveyor and sorting of goods and being able to segment the container into said volume segments. The assembling and storage conveyors and diverting conveyors are prefereably provided in two layers. The control system preferably comprises a physical distribution control computer which generates sorting data, diverting data and assembly data, a facilities control computer which generates necessary control commands out of said sorting data, diverting data and assembly data from said physical distribution control computer and a control means which controls predetermined functions with said control commands from the facilities control computer. This invention method can sort out goods in a manner of loading on trucks or the like in first-in-last-out in accordance with the number of destinations for one delivery, and the items or quantity of goods for one destination. The method further can sort goods efficiently in a manner to deal with changes in orders which may occur for every delivery by taking out goods for several truck loads at one time and sorting them for first-in-last-out for each truck.According to this invention method, goods are unlikely to collapse during transportation as they can be piled at even height in a container to secure safe delivery. In the following the invention is explained in detail in connection with the embodiments shown in the attached drawings. FIG. 1 is a flow chart to show the steps of control data generation for a sorting system according to one embodiment of the method. FIG. 2 is a block diagram of an embodiment of a physical distribution system to which the method is applicable. FIG. 3 is a block diagram to show the control system thereof. FIG. 4a is a schematic plane view to show essential portions of the sorting system. FIG. 4b is a schematic cross section of the system shown in FIG. 4a when viewed from the line A-A. FIG. 5 is a schematic sectional via to principally show the loading state of goods in a container according to one embodiment of the method. FIG. 6a is a schematic plane view to show essential portions of a sorting system according to another embodiment of the method. FIG. 6b is a schematic sectional view of the system shown in FIG. 6a when viewed from the line A-A. FIG. 7 is a schematic sectional view to principally show the loading state of goods in a container according to another embodiment of the method. FIG. 8 is a plane view of installed storage lines according to one embodiment of the sorting system. FIGs. 9a, 9b and 9c are respectively a plane installment view, a side view viewed from the line A-A, and another side view viewed from the line B-B of the installment of lines according to the embodiment of the system. FIGs. 10a and 10b are explanatory views of the operation of a diverting conveyor thereof; FIG. 10a shows a plane view and FIG. 10b a frontal view. FIGS. 11a and 11b are explanatory views of the operation of a carrying out device thereof; FIG. 11a is a plane view, and FIG. 11b a side view when viewed from the line A-A. FIG. 12 is an explanatory view of the operation of a transfer and a stopper thereof. According to FIG. 2 there are provided a picking line 101 where goods are picked up by a picking device in the unit of items based on a predetermined batch picking data, a storage line 102 where goods conveyed from the picking line 101 are stored temporarily and taken out in a predetermined amount based on the batch picking data to forward them to the next step, a merging conveyor line 103 where goods arrive from said plural storage lines 102 starting from the one where a predetermined number of goods has been assembled to merge with goods from other lines, and a diverting line 104 where goods are divided and sorted into groups based on the diverting data or sorting group data which have been prepared in advance according to the dimensions for an assembling. Furthermore, there are provided an assembling and storage line 105 which stores thus diverted goods, a carrying out line 106 where goods are carried out from each assembling and storage line 105 in the unit of a container when a container number (container identification number) is specified, a loading container line 107 where discharged goods are transported to the loading stations, loadings 108 and deliveries 109. The flow of operations from the picking line 101 to the loading conveyor line 107 is controlled automatically by a computer. FIG. 3 shows the control system with computers which comprises a host computer (CPU) 201, a physical distribution control computer 202, facilities control computer 203 and a sorting system 204. The host computer (CPU) 201 controls the physical distribution system as a whole; for example, it prepares a schedule for delivery based on received order data and feeds the schedule to a downstream physical distribution control computer 202. The physical distribution control computer 202 determines groups of goods based on the delivery schedule, prepares diverting data and batch picking data, and outputs them to a facilities control computer 203. The facilities control computer 203 prepares the required control commands based on the diverting and batch picking data, and outputs them to the sorting system 204. The sorting system 204 controls the merging, diverting and carrying out of the goods with a sequencer. An embodiment of this invention sorting method will be described in detail by referring to FIGs. 1, 4a and 4b. In FIGs. 4a and 4b, the reference numeral 301 denotes a container on which goods are to be loaded, 302 a container loader, 303 assembling and storage lines, and 304 a diverting line. The assembling and storage lines 303 and the diverting line 304 are provided in two layers. In FIG. 4b, the reference numeral 303-1 denotes an assembling and storage line from which goods are being carried to a container, and 303-2 another assembling and storage line where goods are being sorted. In these figures, goods are expressed in squares of respective dimensions. Description will be given to a case where goods are divided into 5 segments and loaded in a container 301. The physical distribution control computer 202 generates necessary data according to the flow chart shown in FIG. 1. (Step S1) .....A container volume is segmented into a plural number In the case shown in FIGs. 4a and 4b, the volume of a container (body of a delivery vehicle) 301 is divided into 6 segments; 1 ○, 2 ○, 3 ○, 4 ○, 5 ○ and 6 ○. In this case, as the container 301 has a door (a take-in/take-out door) at rear side, the volume thereof is divided longitudinally into 6 portions. As goods having a larger length and/or width should be placed in lower layers to stabilize the load during delivery, the number (an integer) of segments is determined by dividing the container length by the length of a relatively larger good. Although the advancing direction of the container 301 and the longitudinal direction of goods are coincided in the figure, they do not necessarily be coincided. (Step S2) .....Determination of a sum of good length for assembling and storage The good length for assembling and storage is then determined so that one assembling and storage line 303 can substantially store the quantity of goods which can be contained in one segment of the container. As shown in FIGs. 4a and 4b, the goods stored in the assembling and storage line 303 1 ○ are to be loaded in the segment 1 ○ of the container 301. Similarly, the goods in the assembling and storage lines 303 2 ○, 3 ○, 4 ○ and 5 ○ are consecutively to be loaded in the segments 2 ○, 3 ○, 4 ○ and 5 ○ of the container 301. The segment 6 ○ of the container 301 is left vacant as there are no more goods (the goods are divided into 5 groups). (Step S3) .....Generation of diverting data It is assumed that the orders have been received from 15 stores for this delivery as listed in the table at page 6. The alphabetical letters a through g , denote items of goods which are arranged in the order of length as shown in FIGs. 4a and 4b. As is obvious from the Table, the order fluctuates widely by items. The destinations or stores are re-arranged in the order of loading while the goods are arranged in the order of length. Then, for each store, from the first store or destination the quantity of an item of goods is multiplied with its length, and resulting goods of each item are added to obtain the sum from the left to the right. When the sum almost reaches the length of one assembling and storage line, collection of data is suspended. The goods which have been counted by then are grouped as one group, and attached with a line number 1 ○ for the goods grouped. The diverting data are prepared so that the particular group should be diverted to and stored on the line 1 ○. In the Table, all the goods in the number of 145 which have the destinations of 15 stores are divided into 5 groups with consideration of length of an assembling and storage line, volume of a container and delivery efficiency. The group 1 ○ comprises 21 goods for the store No. 1, 6 goods for the store No. 2, and 2 goods for the store No. 3 in total of 29 goods. Similarly, the group 2 ○ comprises 1 good for the store No. 3, 21 goods for the store No. 4, and 5 goods for the store No. 5 in total of 27 goods; the group 3 ○ comprises 6 goods for the store No. 5, 5 goods for the store No. 6, 13 goods for the store No. 7, and 7 goods for the store No. 8 in total of 31 goods, the group 4 ○ comprises 5 goods for the store No. 8* ) and 8 goods for the store No. 11 in total of 30 goods; the group 5 ○ comprises 2 goods for the store No. 11, 7 goods for the store No. 12, 9 goods for the store No. 13, 7 goods for the store No. 14 and 3 goods for the store No. 15 in total of 28 goods. The number of the five groups meet more or less the number of 30 goods. The order listed in the Table is determined according to a quantity of destination and the order of delivery for each container by the host computer (CPU) 201. (Step S4) .....Preparation of batch picking data As described above, plural goods are assembled for each container and almost all the assembling and storage lines 303 are allocated with goods which are divided in the unit of one container. The total of the goods are then regarded as the whole picking volume. In other words, the number of goods on assembling and storage lines becomes a *) 5 goods for the store No. 9, 12 goods for the store No. 10 picking number, which is 3000 in the above Table. The number of goods is summed for all the containers in the unit of items. Picking data are then prepared in a manner to pick up the goods in the order of length. As described in the foregoing, goods are piled and loaded in the container 301 in a predetermined state as one example is illustrated in principle in FIG.5. This invention method enables the following: The host computer (CPU) 201 calculates data on plural (sometimes singular) stores or destinations for one container (or one vehicle) as well as the order of delivery; then the physical distribution control computer 202 processes above data to generate batch picking data; based on the batch picking data, goods are picked up in batch to thereby pick up goods for a plural number of containers simultaneously at higher efficiency compared to the prior art picking method which was limited to one container volume. This invention method enables storing goods as long as the length of an assembling and storage line within the segmental volume of a container by determining the number of goods with the number of segmentations of the container, space for assembling and storage is thereby at higher efficiency compared to the prior art assembling and storage method which was limited to one store. In the embodiment of the order listed in the Table, as shown in FIGs. 4a and 4b, goods are arranged in the order of length of items of goods a , b , c , d , e , f and g . In this invention method goods are carried out from assembling and storage line 303 1 ○ to be sequentially loaded in the segment 1 ○ of the container 301. In this manner, the goods intended for the stores Nos. 1 and 2 and a part of those intended for the store No. 3 are piled up in the unit of items. If a distributor (driver) delivers the goods in the order of the stores 3, 2 and 1, the distributor (driver) will find the goods in the order of delivery immediately inside the rear door as soon as he/she opens it. This method of loading never places the goods which would be unloaded last at the rear-most side or immediately inside the rear door or never places the goods which should be unloaded first at the farthest end, but always allow the distributor to unload the goods from nearest segments to achieve the same effect as the goods are loaded in accordance with the stores. This not only permits the distributor to unload the goods efficiently but also allows another worker to share the works of loading in loading stations so that the distribution schedule for the distributor can be more effectively planned. In the other embodiment of FIGs. 6 and 7, the container 301 used in the embodiment shown in FIGs. 4a and 4b is replaced by a container 301' having a smaller volume where goods are piled in five segments in a manner not to leave a vacant space on the bottom. In other words, when forming the data using the Table above, data for one segment are formed when the sum of the lengths becomes almost equal to one fifth of the total length of the goods which are to be loaded in the container 301'. Instead of the container 301' of the smaller volume, it is possible to use the container 301 shown in FIGs. 4a and 4b; the divider may be set at an integer (in this case six) by dividing the length of the container by the length of a relatively large good to thereby decrease the quantity of goods for one segment and set the amount in one segment almost equal to each other. As is obvious from FIG. 7, because goods are piled at an even height all over the container in this embodiment, the piled goods won't collapse during delivery but will be safely delivered to destinations. FIG. 8 is an installing plane view of storage line 102, FIGs. 9a, 9b and 9c are installing plane views including assembling and storage line 105 installed downstairs of the storage line 102. In the storage line 102 goods which have been stored temporarily according to said batch picking data are placed on 3 sets of storage conveyors 1A, 1B and 1C respectively. The merging conveyor line 103 which carries a predetermined number of goods in a batch to the next step comprises 3 sets of acceleration conveyors 2A, 2B and 2C which are provided at the outlet terminals of storage conveyors and which carry out goods one by one, and merging conveyors 3A and 3B which are provided substantially perpendicular to said acceleration conveyors. The merging conveyor 3B extends in inclination through a floor pit FP bored in the floor to carry the goods to a switching conveyor 4 installed downstairs as shown in FIG. 9b. FIG 9a is a layout of downstairs lines including diverting line 104, assembling and storage lines 105, carrying-out line 106, and loading conveyor lines 107 and FIGs. 9b, 9c side views when viewed from the line A-A and B-B respectively. As shown in FIG. 9b, the switching conveyor 4 is adapted to move up and down at the right end in the figure so that it can convey goods to either conveyor 5 or 15 installed in two layers. When viewed from above in FIG. 9a, those conveyors in two layers are denoted by a number and the same number in parenthesis. The goods which have been conveyed on the conveyors 5 and 15 are given a certain interval with index feeders 6 and 16. A diverting line 104 comprises diverting conveyors 7 and 17 with diverting devices, and diverts goods based on the diverting data into a large number of lead-in conveyors 8 and 18 which are provided substantially perpendicular to the diverting conveyors 7 and 17. An assembling and storage line 105 comprises inclined roller conveyors 9 and 19 as shown in FIGs. 9a and 9c, and the goods which have been carried by the lead-in conveyors 8 and 18 travel with their own gravity on the slope to be assembled and stored. A carrying-out line 106 comprises carrying out devices 10 and 20, and conveyors 11 and 21, and when a container number is specified, the stoppers of the carrying out devices 10 and 20 are released to carry out goods in the unit of a container for each line (See FIGs. 11a and 11b). The carried out goods are moved for the loading station for a container by conveyors 11 and 21 with transfer feeders 12 and 22 and stoppers 13 and 23, and replaced onto a loading conveyor 14 (container loader 302) of the loading conveyor line 107. A switching chute 14A is provided between the upper conveyor 11 and the loading conveyor 14 as shown in FIG. 9c in a manner that when goods are carried out from the upper conveyor 11, the chute 14A is lowered to be connected and when goods are carried out from the lower conveyor 21, it is raised to be separated at the position shown with broken line. Goods are conveyed to the container 301 via the loading conveyor 14 in this manner. Description will now be given to the operation of sorting and moving of goods on each line. According to FIGs. 10a and 10b plural conveyor belts 7A move the goods (not shown) in the direction of the arrow mark a . Between the conveyor belts 7A are provided skewed wheels 7B at prescribed positions with rotational shafts 7C thereof at a predetermined angle against the advancing direction of the conveyor 7A. The rotational shaft 7C is supported by a bracket 7D in a manner to allow free rotation of a skewed wheel 7B, and the bracket 7D is supported on a pop-up device 7E via an arm 7F. A set of diverting conveyors 7 (17) is provided for each of the lead-in conveyors (18) shown in FIG. 9a. As described above, in the conveyor 7 (17) which is selected for the lead-in conveyors 8 (18) with the commands of diverting data, the skewed wheels 7B are pushed up in the direction of the arrow b by the pop-up device 7E as shown in FIG. 10b to the position shown with broken line so that the goods can move in the direction of the arrow c to finally move to the lead-in conveyors (not shown). In FIG. 11b, the goods (not shown) travel an a free roller 10A in the direction of arrow d , but they normally are stopped from travelling as a cylinder 10b positions a lever 10E substantially vertical to push up a frame 10C, and a stopper 10B and a lift frame 10F are kept at positions above the upper surface of the free roller 10A. When a predetermined signal is inputted, the cylinder 10D turns the lever in the direction of an arrow e , the frame 10C turns around a shaft 10G in the direction of an arrow f to thereby lower the stopper 10B and lift frame 10F below the upper surface of the free roller 10A. This makes goods (not shown) travel and they are moved by a driving wheel 10H into conveyors 11 (21). FIG. 12 is an explanatory view of the operation of transfer feeders 12 (22) and stoppers 13 (23) which transfer the goods which have been carried on the conveyors 11 (21) in the direction of an arrow g onto the conveyor 14 (not shown) (if the conveyor is at the upper layer, via a switching chute) in the direction of an arrow h . When the goods are not transferred, as the transfer cylinder 12B and the stopper cylinder 13B are not actuated, the upper end of a large number of wheels 12D on the frame 12C and the upper end of a stopper plate 13A become positioned at a level lower than the upper surface of the driving roller 12A. The goods therefore advance thereon in the direction of an arrow g . When a signal for transfer is inputted, the transfer cylinder 12B and the stopper cylinder 13B are actuated in the directions j and k respectively to push up the wheel 12D and the stopper plate 13A to the positions shown by broken lines, thereby moving the goods in the direction of arrow h . Over-flow lines 17 and 27 shown in the left side of FIG. 9a store the goods which cannot be diverted as no diverting data are supplied. The sections above are controlled in operation by the physical distribution control computer 202 and the facilities control computer 203 shown in FIG. 3. As this invention sorting system comprises plural assembling and storage conveyors which store diverted good in classified groups, a diverting conveyor which diverts the goods carried in items into prescribed assembling and storage conveyors, and a control system which controls said diverting conveyors and assembling and storage of goods to thereby effectively perform dividing and loading operations of goods according to this invention sorting method. For example, the length of roller conveyors 9 (19) may be made identical to the length of an assembling and storage line to eliminate the steps S1 and S2 in FIG. 1. The diverting lines 104, assembling and storage lines 105 and carrying -out lines 106 may be installed in one layer instead of two. The two layer structure is advantageous, however, in that while goods are being assembled and storaged in the lower layer, already assembled and storaged goods on the upper layer will be moved to the carry-out conveyor to enhance the efficiency. As the diverting conveyors 7 and 17 are not used simultaneously, the controller for them may be the one set. The diverting conveyor 7 (17) may be sortor of a tray type. The trucks may have containers which are not detachable or maybe freight cars.

Claims: A method for sorting a predetermined quantity of goods substantially in the order of delivery by forming groups of goods to be loaded into a container (301), characterized in that the container (301) to be loaded is segmented into volume segments able to take up the largests of said goods in length and/or width and for each segment one group of different goods is formed in advance via the control of a control system (201 - 204) which receives respective instructions concerning the order of delivery, the amount and size of goods to be delivered and the so formed groups are then loaded in their order of delivery, the order of goods within each group being determined by the length and/or width of said goods, the goods of larger length and/or width being placed in lower layers. The method according to claim 1, characterized in that the amount of goods is determined for each group in a manner of making the number in each group substantially equal to each other depending on the number of groups which have been formed in advance. A system for sorting goods according to the method as claimed in claim 1 or 2, characterized in that it comprises plural assembling and storing conveyors (1A, 1B, 1C) which form assembly groups of said goods, at least one diverting conveyor (7, 17) which diverts the different goods into said assembling and storage conveyors (1A, 1B, 1C), and the control system (201 - 204) which controls said diverting conveyor (7, 17) and sorting of goods and being able to segment the container (301) into said volume segments. The system according to claim 3, characterized in that assembling and storage conveyors (1A, 1B, 1C) and diverting conveyors (7, 17) are provided in two layers. The system according to claim 3 or 4, characterized in that the control system (201 - 204) comprises a physical distribution control computer (202) which generates sorting data, diverting data and assembly data, a facilities control computer (203) which generates necessary control commands out of said sorting data, diverting data and assembly data from said physical distribution control computer (202) and a control means which controls predetermined functions with said control commands from the facilities control computer (203).

Inventors: TANAKA, NOBUHIRO
Applicants: KAO CORPORATION
Application year: 1987
Main classification: B65G1
IPC codes: B65G47, B65G1