METHOD OF ORDER FULFILLING BY MAKING STORAGE UNITS AVAILABLE FROM A STORAGE FACILITY IN A DESIRED SEQUENCE AT A PACK STATION

Abstract

A method of fulfilling orders by making orders available in order units by picking from product units in a storage facility that includes a routed product order picking area, and an automated storage and retrieval racking area that is upstream from the routed products order picking area and connected thereto by a routing conveyor. The method includes reassigning order fulfillment of orders requiring products from product units requiring many exchanges between adjoining storage racks from a source storage rack to an adjacent storage rack via cross conveyance locations in the storage racks themselves to reach a destination storage rack, where the orders are reassigned to the routed products order picking area for parallel order fulfillment such that bottlenecks within the automated storage and retrieval racking area can be prevented or at least decreased.

Claims

1. A method of fulfilling orders by making orders available in order units by picking from product units in a storage facility, wherein: the storage facility has a routed product order picking area; the storage facility has an automated storage and retrieval racking area; the automated storage and retrieval racking area is arranged upstream from the routed products order picking area and is connected to the routed products order picking area by a routing conveyor; the automated storage and retrieval racking area comprises: a storage racking comprising a plurality of multilevel storage racks in which order and/or product units are stored, wherein the storage racks are disposed back-to-back in pairs and have an aisle between pairs; at least one automatic storage and retrieval device provided for each storage racking aisle, wherein the order and/or product units are stored and retrieved from the storage racks by the automatic storage and retrieval device, and wherein order and/or product units are exchanged directly between two adjoining storage racks from a source storage rack to an adjacent destination storage rack via cross conveyance locations in the storage racks themselves using only the least one automatic storage and retrieval device, wherein the at least one automatic storage and retrieval device comprises a shuttle; at least one storage-entry conveyor provided for feeding order and/or product units into the storage racking; at least one storage-exit conveyor provided for retrieval of order and/or product units from the storage racking; at least one lifting device used, in order to transfer the order and/or product units from a storage level of the storage rack to the at least one storage-exit conveyor; at least one fully or semiautomatic picking station for picking from product units into order units for fulfilling orders, to which order and/or product units are fed by the at least one storage-exit conveyor and from which order and/or product units are dispatched by the at least one storage-entry conveyor; the routing conveyor is connected to the at least one inbound storage-entry conveyor and the at least one storage-exit conveyor of the storage racking; wherein the method comprises; fulfilling orders requiring products from product units requiring many exchanges performed by the least one automatic storage and retrieval device between adjoining storage racks from a source storage rack to an adjacent storage rack via cross conveyance locations in the storage racks themselves to reach a destination storage rack by reassigning by a system controller order fulfillment to the routed products order picking area for parallel order fulfillment by use of the routing conveyor which connects the automated storage and retrieval racking area and the routed products picking area and wherein the routed products order picking area comprises manual picking stations supplied and arranged along the extension of the routing conveyor; supplying the routing conveyor with order units picked at the manual picking stations; and supplying donor units to the routed products order picking area and discharging finished order units via the routing conveyor; wherein product units requiring many exchanges via cross conveyance locations for fulfilment of a specific order are discharged from the automated storage and retrieval racking area to the routed products picking area.

2. The method as claimed in claim 1, wherein product units expecting batch pick effect are discharged from the automated storage and retrieval racking area to the routed products order picking area.

3. The method as claimed in claim 1, wherein product units requiring a plurality of exchanges via cross conveyance locations are discharged from the automated storage and retrieval racking area to the fully or semiautomatic picking station belonging to the same racking area then products are dirty batch picked and routed to a put wall.

4. The method as claimed in claim 1, wherein the routed products order picking stations comprise put-walls.

5. The method as claimed in claim 1, wherein the routing conveyor loops back to the automated storage and retrieval racking area after leaving the routed products order picking area.

6. The method as claimed in claim 1, wherein the routed products order picking area comprises picking stations supplied and arranged along an outer aisle of the automated storage and retrieval racking area and supplying the routing conveyor with order units picked at the picking stations.

7. The method as claimed in claim 1, wherein the routed products order picking area is used for order consolidation of donors belonging to particular orders at the at least one fully or semiautomatic picking station.

8. The method as claimed in claim 1, wherein orders are reassigned to the routed products area when the efficiency of the at least one automatic storage and retrieval device falls below a predetermined threshold.

9. The method as claimed in claim 8, wherein the predetermined efficiency threshold is based upon the feed rate of items to the at least one fully or semiautomatic picking station.

10. The method as claimed in claim 1, wherein orders requiring a plurality of items stored in a plurality of different aisles of the storage racking are reassigned to the routed products area.

11. The method as claimed in claim 1, wherein orders requiring items with many needed exchanges via cross conveyance locations are reassigned to the routed products order picking area by the routing conveyor, wherein the routed products order picking area is physically and/or logically separated from the automated storage and retrieval racking area.

12. The method as claimed in claim 2, wherein the routing conveyor loops back to the automated storage and retrieval racking area after leaving the routed products order picking area.

13. The method as claimed in claim 2, wherein the routed products order picking area comprises picking stations supplied and arranged along an outer aisle of the automated storage and retrieval racking area and supplying the routing conveyor with order units picked at the picking stations.

14. The method as claimed in claim 2, wherein the routed products order picking area is used for order consolidation of donors belonging to particular orders at the at least one fully or semiautomatic picking station.

15. The method as claimed in claim 2, wherein orders are reassigned to the routed products area when the efficiency of the at least one automatic storage and retrieval device falls below a predetermined threshold.

16. The method as claimed in claim 15, wherein the predetermined efficiency threshold is based upon the feed rate of items to the at least one fully or semiautomatic picking station.

17. The method as claimed in claim 2, wherein orders requiring a plurality of items stored in a plurality of different aisles of the storage racking are reassigned to the routed products area.

18. The method as claimed in claim 2, wherein orders requiring items with many needed exchanges via cross conveyance locations are reassigned to the routed products order picking area by the routing conveyor, wherein the routed products order picking area is physically and/or logically separated from the automated storage and retrieval racking area.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0076] FIG. 1 shows a schematic plan view of a storage facility with an automated storage and picking area and a routed products order picking area connected downstream;

[0077] FIG. 2 shows a schematic plan view of an alternative storage facility with an automatic put wall for dedicated order consolidation;

[0078] FIG. 3 shows a schematic plan view of an alternative storage facility with shared order consolidation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0079] In FIG. 1 a schematic plan view of a storage facility with an automated storage and retrieval racking area I and a routed products order picking area II is shown. The automated storage and retrieval racking area I is arranged upstream from the routed products order picking area II and is connected to the routed products order picking area II by a routing conveyor 5, which eventually leads to a shipping area III but also loops back to the entry/exit of the automated storage and retrieval racking area I.

[0080] The automated storage and retrieval racking area I comprises a storage racking 1 comprising a plurality of multilevel storage racks R in which order and/or product units U are stored, wherein the storage racks R are disposed back-to-back in pairs and have an aisle 2 between pairs (only exemplified for one aisle). The aisles 2 are connected to semi or full-automated picking stations 3 through conveyor installations 4, which encompass at least one storage-entry conveyor 4A provided for feeding order and/or product units U into the storage racking 1, and at least one storage-exit conveyor 4B provided for retrieval of order and/or product units U from the storage racking 1. So, the semi/full automatic picking station 3 for picking from product units D (D for donor) into order units O (O for order) for fulfilling orders are fed by the at least one storage-exit conveyor 4B and order and/or product units are returned to the storage rack by the at least one storage-entry conveyor 4A.

[0081] The routing conveyor 5 is also connected to the at least one inbound storage-entry conveyor 4A and the at least one storage-exit conveyor 4B. In this manner, the routing conveyor 5 forms a loop connecting the picking stations 3, inbound storage-entry conveyors 4A and storage-exit conveyors 4B, the routed products picking area II and the shipping area III.

[0082] Each storage racking aisle 2 has one automatic storage and retrieval device in the form of a shuttle 6 provided in each level or each few levels for storage and retrieval of order and/or product units in the storage racks R. Order and/or product units U are exchanged directly between two adjoining storage racks R from a source storage rack to an adjacent destination storage rack via cross conveyance locations Q in the storage racks themselves, which can be one-way exchange locations Q or bidirectional, as disclosed in WO 2015/007514 A1.

[0083] The shuttle 6 itself displaces the order or product units U in the cross-conveyance locations Q actively with its load handling means, which are telescopic arms on both sides of a loading platform and are equipped with unit handling levers. There is no active drive means within the racks R themselves. The shuttle 6 of a source rack places the order or product units U into the cross-conveyance location Q in an adjacent destination rack, so that the shuttle operating in the according, neighboring aisle can handle the unit by normal deep operation. In other words, the sourcing shuttle operates deeper than for normal single or double deep storage, e.g. triple deep for exchange. Therefore, it is possible to transfer units U through the storage racking 1 without leaving the storage by transferring the units U via the cross-conveyance locations Q only.

[0084] As described, the semi/fully automatic picking stations 3 are sourced by the automated storage 1 for picking from product units D (D for donor) into order units O (O for order) for fulfilling orders. To do so the items needed to fulfil a certain order are all transferred via the cross-conveyance exchange described to a destination aisle for discharge to a specific semi/fully automatic picking station 3. This is possible via the cross-conveyance operations when order load is low, as not all picking stations 3 need to be manned/used.

[0085] As soon as order levels rise, further or all picking stations 3 will be manned/used. The use of cross conveyance operations to provide all picking stations 3 with the items necessary for order fulfillment can be achieved with high throughput for approx. ten aisles with directly connected picking stations. Higher numbers of aisles or picking stations 3 do not lead to higher throughput. To achieve or sustain such higher throughput, order fulfillment of orders requiring products from product units requiring many exchanges between adjoining storage racks from a source storage rack to an adjacent storage rack via cross conveyance locations Q in the storage racks themselves to reach a destination storage rack or aisle are reassigned to the routed products picking area I for parallel order fulfillment.

[0086] Therefore, orders are reassigned to the routed products area when the efficiency of the at least one automatic storage and retrieval device falls below a predetermined threshold for a predetermined feed rate of items to the at least one fully or semiautomatic picking station. In the present case such a feed rate is approx. 700 items per hour. Such orders usually require many items stored in many different aisles of the storage racking require items with many needed exchanges via cross conveyance locations are reassigned to the routed products area. To do so product units D requiring many exchanges via cross conveyance locations Q are discharged from the automated storage and retrieval racking area Ito the routed products picking area II, which picking stations comprise manually operated put-walls 7 and single pick/pack stations 8. This allows the system to sustain high throughput even when using more than ten picking stations/aisles.

[0087] The looped routing conveyor 5 therefore transports the product units D to the manually operated put-walls 7 and single pick/pack stations 8 according to order fulfilment requirements based upon warehouse management controls.

[0088] At the put-wall 7 operators use the put-wall cubby holes for buffering product units for later consolidation of donor units for orders containing many so-called ugly products, which are such products needing many aisle exchanges.

[0089] As described the routing conveyor 5 connects both the automated storage and retrieval racking area I and routed products picking area II to a shipping area III and also loops back to the automated storage and retrieval racking area I after leaving the routed products picking area II. Therefore, the fulfilled orders can be discharged for shipping to the shipping area III.

[0090] On the other hand, it is also possible to prepick orders (partially pick) and combine prepicked orders at a later point in time to finally fulfil the order. This can be performed at the put-walls 7 of the routed products order picking area II. Additionally, the put-walls 7 may be used to pick orders which include items that cannot be handled at the picking stations 3, e.g. due to size, weight etc. In addition, single orders (order consisting of only single product type) can be routed to the single pick/pack stations 8 for the sake of reducing workload at semi/fully automatic pick stations although this would not reduce amount of cross aisle transactions.

[0091] Alternatively, the routed products order picking area II may include an automated put-wall 9 according to FIG. 2, which is integrated into the last aisle of the automated storage and retrieval racking area I and therefore forms an interface between both areas. Otherwise the automated storage and retrieval racking area I is similar to FIG. 1. The automated put-wall 9 is functionally performed by a dedicated aisle 10 of the automated storage and retrieval racking area I in which donor units are temporarily buffered for later discharge to semi/fully automatic picking station for the aisle or routed to specific picking station via the routing conveyor, so that inter aisle exchanges are minimized.

[0092] In an alternative embodiment shown in FIG. 3, the routed products order picking area II is not spatially separated from the automated storage and retrieval racking area I, but only logically. Functionally both areas are interconnected via the routing conveyor 5 that loops automated storage and retrieval racking area I.

[0093] Therefore, donor units D needing many exchanges for order fulfilment in a certain aisle may be routed by the routing conveyor 5 long-range to the destination aisle for order fulfilment. Therefore, the donor units may be consolidated in any aisle without use of inter aisle exchanges if overall workload of the system is high or a predetermined efficiency threshold is not met, be based upon the feed rate of items to the at least one fully or semiautomatic picking station 3.

[0094] Accordingly, orders may be logically reassigned to the routed products order picking area when the efficiency of the at least one automatic storage and retrieval device falls below such predetermined threshold.

[0095] It has been found that when more than a certain number of picking stations (or aisle when these are directly connected) are present, the throughput decreases when all those picking stations are in use due to the amount of cross-conveyance operations necessary to provide the needed items to each picking station. Such a predetermined feed rate is 600-700 cases/items per hour per picking station.

[0096] The above embodiments may be combined with each other in many ways within the scope of the invention.