Abstract:
Objective: To offer an inventory control system well suited for the control of inventory comprising many types of small-volume products-such as clothing, accessories, shoes, bags, wallets, and fashion items classified according to design, color, size, and other attributes-that heavily depends on the current fashions and season and rotates on a short-term basis.  
     The invention comprises a plurality of electronic tags  1  installed in a floor  3  in which data on installation locations is stored, a storage shelf  8  for storing inventory, and a movable reader  23  that reads location data from the electronic tags  1  and carries a product that moves along the aisle. Data stored in an electronic tag, from among a plurality of electronic tags  3 , installed near the storage shelf  8  on which inventory is stored contains data on a product stored on the storage shelf  8 . The movable reader  23  comprises a communications antenna  4  that communicates in a wireless fashion with the electronic tags, a transceiver connected to the communications antenna  4 , a data processor that sends and receives data via the transceiver, and a database  7  that provides data to the data processor.

Description:
FIELD OF INDUSTRIAL USE  
         [0001]    The present invention relates to an inventory control system for clearing out inventory comprising many types of low volume products—such as clothing, accessories, shoes, bags, wallets, and fashion items classified according to design, color, size and the like—that heavily depend on the current fashions and season and change on a short term basis. More particularly, the present invention relates to an inventory control system which uses electronic tags to control the storage location of many types of a small quantity of products.  
         PRIOR ART  
         [0002]    In controlling product inventory such as clothing, accessories, shoes, bags, wallets, and fashion items, the number of classifications becomes extremely large because each product is segmented by design, color, size and the like.  
           [0003]    Further, with respect to products which are highly fashionable and heavily depend on the season, it is necessary to frequently change the inventory because these products should be kept in stock a short period of time.  
           [0004]    Therefore, when these inventory products are to be shipped out, one must search and retrieve the desired products from amongst a huge number of inventory classes, and because inventory products are frequently changed, the administration of the storage location data for the inventory products is a major problem.  
           [0005]    A prior art inventory control system, an example of which is shown in FIG. 9, uses a moveable read-out device  25  comprised of a bar code reader  17  and a data processor  6 .  
           [0006]    The prior art inventory control system, as shown in FIG. 10, is further comprised of an inventory storage location having a shelf  8  disposed on a floor  3 , a bar code  17  attached to shelf  8 , and a plurality of packages  9 .  
           [0007]    In addition, the prior art inventory control system shown in FIG. 11 is equipped with an inventory control center having a computer  19 , a database connected to computer  19  or located therein, and a printer  20  connected to computer  19  for printing out a work order  29 .  
           [0008]    The moveable read-out device  25  shown in FIG. 9 moves between the inventory storage location and the inventory control center, and operates as transportation device used to bring in and remove inventory products.  
           [0009]    When inventory is to be brought in, as shown in FIG. 10, a package  9  containing inventory is loaded on moveable read-out device  25 , and is carried to a nearby storage shelf  8 .  
           [0010]    Next, package  9  is placed on shelf  8 , and when it is placed thereon, a worker reads the bar code  18  attached to shelf  8  with bar code reader  17 , and data on the storage location is stored in data processor  6 .  
           [0011]    When all of the inventory in packages  9  have been brought in, the moveable read-out device  25  returns to the inventory control center shown in FIG. 11, the data processor  6  is connected to computer  19 , and the storage location data read from bar code  18  on the storage location shown in FIG. 9 is transmitted to computer  19 . This data is stored in database  7  and is used for inventory control.  
           [0012]    When inventory is to be cleared out, because data on the storage location of inventory products based on the bar code  18  attached to shelf  8  is saved on database  7 , computer  19  searches the storage location data, lists the products stored on database  7  that are to be cleared out, and prints out the search results as a work order  29  by means of printer  20 .  
           [0013]    Therefore, a worker in charge of clearing out these products is able to search for and go to these products by means of work order  29 , which contains data on the products to be cleared out and the storage location.  
           [0014]    Problems to be Solved by the Invention  
           [0015]    With this sort of prior art inventory control system, when package  9  is placed on shelf  8  or is moved from shelf  8 , it is necessary to read bar code  18 . With clothing, accessories, shoes, bags, wallets, fashion items, and the like that heavily depend on current fashions and season, the complexity of reading bar code  17  causes work efficiency to decrease because inventory frequently comes in. In addition, with product groups that have a large number of types but a small quantity, a plurality of packages  9  must be frequently moved and arranged on shelf  8  because the content and number of inventory products fluctuate over a short period of time. With this sort of change in storage, for each package  9  to be moved, it is necessary to first read bar code  18  at its current location in order to delete the storage location data, and then read another bar code  18  in order to register the new storage location. This is an extremely tedious task.  
           [0016]    Further, in the prior art inventory control system, the task of registering products and the storage location data is necessary. Because all inventory data is stored in database  7 , it is necessary to immediately return to the inventory control center after inventory is brought in and store the data read from bar codes  17  in database  7 . However, the reading and storage of this data is simply a task which is carried out to control inventory data, and is not undertaken for the task of bringing in inventory, and thus this becomes a burden on inventory control.  
           [0017]    A computer  19 , a database  7  and a printer  20  are installed in the inventory control center. The inventory control center must be continually used, and its use requires tools, space, staff, and the like. All of this does not have as its object the storage of essential products, and is a burden on the control of inventory data.  
           [0018]    When clearing out products, the products to be cleared out and their storage location is printed out on a task sheet  21 . However, it is difficult to show a storage location in printed data, and because coordinate data and the like are displayed, workers must guess at the actual storage location. Even if a diagram is provided, it can only be a general overview diagram because it cannot be enlarged or reduced when searching.  
           [0019]    Accordingly, it is believed that this invention will solve the problems associated with this sort of prior art inventory system.  
           [0020]    Means for Solving the Problems  
           [0021]    An inventory control system according to the present invention is composed of a plurality of electronic tags installed in a path and in which installation location data is stored, a storage means for storing inventory products, and a moveable reading device which can carry inventory products to be moved along said path and read location data by means of said electronic tags.  
           [0022]    Amongst the plurality of electronic tags, the data stored in the electronic tags installed in the vicinity of the storage means for storing inventory products contains data relating to the products stored in the storage means.  
           [0023]    The moveable reading device includes a communication antenna for wireless communication with the electronic tags, a transceiver connected to the communication antenna, a data processor for sending and receiving data via the transceiver, and a database providing data to the data processor.  
           [0024]    The moveable reading device contains a reading device for reading data from product tags attached to products and/or data from package tags attached to packages.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0025]    [FIG. 1] 
         [0026]    Figure showing the first embodiment of the movable reader and the floor used in the inventory control system of the invention.  
         [0027]    [FIG. 2] 
         [0028]    Figure showing in detail the movable reader seen in FIG. 1.  
         [0029]    [FIG. 3] 
         [0030]    Figure showing the first embodiment of the inventory control system of the invention.  
         [0031]    [FIG. 4] 
         [0032]    Figure showing the second embodiment of the movable reader used in the inventory control system of the invention.  
         [0033]    [FIG. 5] 
         [0034]    Figure showing the third embodiment of the movable reader used in the inventory control system of the invention.  
         [0035]    [FIG. 6] 
         [0036]    Figure showing the third embodiment of the inventory control system of the invention.  
         [0037]    [FIG. 7] 
         [0038]    Figure showing the fourth embodiment of the movable reader used in the inventory control system of the invention.  
         [0039]    [FIG. 8] 
         [0040]    Figure showing the fourth embodiment of the inventory control system of the invention.  
         [0041]    [FIG. 9] 
         [0042]    Figure showing one example of a movable reader used in a conventional inventory control system.  
         [0043]    [FIG. 10] 
         [0044]    Figure showing one example of an inventory storage location in a conventional inventory control system.  
         [0045]    [FIG. 11] 
         [0046]    Figure showing one example of an inventory control center in a conventional inventory control system. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
     Embodiments of the Invention  
       [0047]    Next, the inventory control system of the present invention will be explained with reference to the figures.  
         [0048]    First Embodiment  
         [0049]    In the inventory control system of the present invention, as shown in FIG. 1, a movable reading device  21  which can carry cargo is used, and moves on floor  3  in which a plurality of electronic tags  1  are embedded. Electronic tags  1  embedded in floor  3  are no-contact type wireless tags which can be read or written to without being contacted. Data on the location of each embedded electronic tag  1  is stored thereon.  
         [0050]    As shown in FIG. 2, movable reading device  21  is equipped with a communication antenna  4  for wireless communication with electronic tags  1  embedded in floor  3 , a transceiver  5  connected to communication antenna  4 , a data processor  6  for sending and receiving data via the transceiver  5 , and a database  7  installed in data processor  6 .  
         [0051]    A movable reading device composed in this manner freely moves on floor  3  shown in FIG. 1, but data processor  6  can communicate with electronic tags  1  and exchange data therewith via transceiver  5  and communication antenna  4 .  
         [0052]    Thus, data processor  6  on movable reading device  21  can read data on its present position at any given moment by means of electronic tags  1 .  
         [0053]    As shown in FIG. 3, the inventory storage location in which movable reading device  21  goes in and out of is equipped with floor  3  in which a plurality of electronic tags are embedded, and a shelf  8  disposed on floor  3  for supporting packages  9 .  
         [0054]    Packages  9  are supported by shelf  8 , and from amongst the plurality of electronic tags  1 , the embedded electronic tag  1  closest to shelf  8  has data stored thereon (other than its installation location data) relating to packages  9  on shelf  8 , or data relating to the products stored in packages  9 .  
         [0055]    In the first embodiment composed in this manner, when movable reading device  21  approaches shelf  8 , it can collect data (other than its whereabouts by communication with electronic tags  1 ) that relates to the packages  9  on shelf  8  or the products in packages  9 . This data is used for the task of bringing in or clearing out inventory by means of movable reading device  21 . That is, when movable reading device  21  moves on floor  3 , data on the inventory products and their storage location will be collected without troubling the workers.  
         [0056]    Further, in the first embodiment shown in FIG. 3, data relating to inventory products stored in electronic tags  1  embedded in the vicinity of shelf  8  is transferred from the electronic tags  1  to database  7  installed on movable reading device  21  every time the moveable reading device  21  visits the installed location of the electronic tags  1  in the vicinity of shelf  8 .  
         [0057]    However, the amount of data that has to be transferred grows large when there is a large volume of stored products, and thus frequent data transfer becomes difficult.  
         [0058]    In this sort of situation, when the date and time of the update is added to the data stored on electronic tags  1 , it will also be stored on database  7  installed on movable reading device  21  because the data thereon is from electronic tags  1 .  
         [0059]    Thus, it is possible for data processor  6  to compare the date and time of update stored on database  7  with the latest date and time of update read from electronic tags  1 . After this comparison occurs, and it is found that the date and time of update is different, only then is the latest information updated. This makes it possible to reduce the amount of unnecessary communication.  
         [0060]    Further, it is acceptable to replace the date and time of update data added to electronic tags  1  with hash values (a reference list) of the stored data.  
         [0061]    The hash values compress the original data, and are representative numbers. Statistically, the hash values supply the same value with respect to different data, and are generally independently and individually generated and obtained. This is adequate for the classification of the original data.  
         [0062]    Because of this, not all of the former data is transferred and the same results are obtained with the same data (that is, a determination is made as to whether or not there has been an update) and the addition of the date and time of the update. In the first embodiment shown in FIG. 1 and FIG. 3, electronic tags  1  are embedded in floor  3 , however they are not limited to the floor, and the same effects and results can be achieved by disposing them on the wall surfaces or storage shelves along the path that the movable reading device travels.  
         [0063]    Second Embodiment  
         [0064]    As shown in FIG. 4, a moveable reading device  22  used in the second embodiment of the present invention is equipped with a communication antenna  4  for wireless communication with electronic tags  1  embedded in floor  3 , a transceiver  5  connected to communication antenna  4 , a data processor  6  for sending and receiving data via the transceiver  5 , a database  7  installed in data processor  6 , map data  11 , and a display device  10   
         [0065]    A movable reading device composed in this manner operates in a similar manner as the movable reading device of the first embodiment, and data on inventory products and their storage location are stored together on database  7 .  
         [0066]    Here, map data  11  includes data based on the storage location data of the inventory products, and if this data is displayed on display device  10 , the storage location data of the inventory products can be illustrated.  
         [0067]    In addition, if real time position data is obtained from electronic tags  1  embedded in floor  3  by way of communication antenna  4  and transceiver  5 , the storage location data of the inventory products can be illustrated.  
         [0068]    Further, this position data can be used to enlarge or reduce the display on display device  10 . That is, when there are no inventory products around as shown in FIG. 1, and one is primarily moving in that area, then a general map can be displayed. And, when there are inventory products around as shown in FIG. 3 or when one is in a complex area, an enlarged map can be displayed. Thus, it becomes possible to display present position data and highly convenient map data.  
         [0069]    Third Embodiment  
         [0070]    As shown in FIG. 5, a moveable reading device  23  used in the third embodiment of the present invention is equipped with a communication antenna  4  for wireless communication with electronic tags  1  embedded in floor  3 , a transceiver  5  connected to communication antenna  4 , a data processor  6  for sending and receiving data via the transceiver  5 , and a reading device  13  for reading data stored in a package tag  12  attached to package  9 . Package tag  12  has data stored in it that relates to the package  9  to which it is attached, or data relating to the products stored in package  9 .  
         [0071]    As shown in FIG. 6, the inventory control system using the movable reading device  23  shown in FIG. 5 is equipped with a moveable reading device  23  that moves freely over the electronic tags  1  embedded in floor  3 , and a shelf  8  serving as an inventory storage position that supports a plurality of packages  9  that have package tags  12  attached thereto.  
         [0072]    In the third embodiment composed in this manner, by reading the data on package tags  12  attached to packages  9  via reading device  23 , the movable reading device  23  can read data relating to the packages  9  supported thereon or data relating to products stored in packages  9 .  
         [0073]    Accordingly, when inventory comes in, when the movable reading device  23  approaches the vicinity of shelf  8  and a package  9  is placed on shelf  8 , the movable reading device  23  can write data relating to the packages  9  supported on shelf  8  or data relating to the products stored in packages  9  to the electronic tags embedded in the vicinity of shelf  8  because the data read from package tag  12  attached to package  9  is transferred to the electronic tags  1  embedded in the vicinity of shelf  8 .  
         [0074]    When a package  9  is moved from movable reading device  23  to shelf  8 , when package  9  has been removed from movable reading device  23  and data from package tag  12  attached to package  9  is no longer being detected, data processor  6  determines that package  9  has been removed and writes data to electronic tags  1  embedded in the vicinity of shelf  8 . This allows workers from being bothered with this task, and allows data relating to products disposed on shelf  8  to be added to electronic tags  1 .  
         [0075]    Further, when package  9  is taken off shelf  8  and placed on movable reading device  23 , data processor  6  reads new data via tag reading device  13  from package tag  12  attached to package  9  placed on movable reading device  23 , determines that a package  9  has been placed thereon and writes data to electronic tags  1  embedded in the vicinity of shelf  8 . This allows workers from being bothered with this task, and allows data relating to products cleared from shelf  8  to be deleted from electronic tags  1 .  
         [0076]    In this manner, the data stored on electronic tags  1  embedded in the vicinity of shelf  8  is data that is consistent with packages  9  disposed on shelf  8  or the products stored in packages  9 .  
         [0077]    In this manner, when a package  9  is moved unconsciously by a worker or the movement of package  9  is complex, because movable reading device  23  is interposed therebetween, there is no exceptional burden on workers, and storage location data relating to inventory products can be preserved and updated.  
         [0078]    In addition, a read/write device which can add and delete is made by adding writing capabilities to reading device  13 , thus allowing package tag  12  to be overwritten. When package  9  is moved, it becomes possible for data processor  6  to write original storage location data onto package tag  12  attached to package  9  via the read/write device, and to record the history of the storage locations of package  9 .  
         [0079]    Fourth Embodiment  
         [0080]    As shown in FIG. 7, a moveable reading device  24  used in the fourth embodiment of the present invention is equipped with a communication antenna  4  for wireless communication with electronic tags  1  embedded in floor  3 , a transceiver  5  connected to communication antenna  4 , a data processor  6  for sending and receiving data via the transceiver  5 , and a reading device  14  for reading a product tag  15  attached to a product  16 .  
         [0081]    As shown in FIG. 8, the inventory control system using the [DOSHIKI] reading device  24  shown in FIG. 7 is equipped with a moveable reading device  24  that moves freely over the electronic tags  1  embedded in floor  3 , and a shelf  8  serving as an inventory storage position that supports a plurality of packages  9 .  
         [0082]    A product tag  15  is attached to each product  16  stored in the plurality of packages  9 .  
         [0083]    In addition, data on products  16  placed on shelf  8  is stored on the electronic tags  1  embedded in the vicinity of shelf  8 .  
         [0084]    With an inventory clearance, when one product  16  stored in package  9  or on shelf  8  is moved to a package  91  prepared beforehand, by placing product  16  close to reading device  14 , data processor  6  can obtain data relating to product  16  from product tag  15 .  
         [0085]    Then, data processor  6  communicates the original data relating to product  16  to the electronic tags  1  embedded in the vicinity of shelf  8  via communication antenna  4 , and the data on the total number of products  16  on shelf  8  stored on electronic tags  1  can be reduced by one. In this way, the data stored on the electronic tags  1  embedded in the vicinity of shelf  8  can be controlled in one inventory product unit increments.  
         [0086]    In addition, in package  91  in the embodiment, if a package tag  12  similar to that in the third embodiment is attached thereto and a reading device  13  for the package tag is loaded onto movable reading device  24 , when product tag  15  is read, both the data stored on electronic tags  1  embedded in the vicinity of shelf  8  and the data on package tag  12  attached to package  91  can be updated. It thus becomes possible to produce detailed data on the products in package  91  due to the package tag  12  attached thereto.  
         [0087]    This function is useful in cases where a plurality of different types of products are mixed together and stored in package  91 , and is suitable for mixed storage of products such as clothing, shoes, handbags, wallets, and the like, which are the same product according to color, size and the like but have slightly different elements.  
         [0088]    Other Embodiments  
         [0089]    As is clear from the above explanation, the third embodiment of the inventory system shown in FIG. 6 is mainly applied to incoming inventory products, and the fourth embodiment of the inventory system shown in FIG. 8 is mainly applied to clearing out inventory products.  
         [0090]    Therefore, it is convenient to read the inventory data stored on electronic tags  1  according to the third embodiment of the inventory system with the movable reading device  23  of the fourth embodiment while processing inventory coming in or being cleared out.  
         [0091]    Effect of the Invention  
         [0092]    As is clear from the explanation based on the above embodiments, the following excellent effects can be obtained according to the present invention:  
         [0093]    When a package is placed on a shelf or is moved from a shelf, it is possible for inventory product data and data on the storage location of inventory products to be automatically updated without carrying out a special process;  
         [0094]    The task of inputting and outputting data in an inventory control center and the like is unnecessary, a movable reading device is moved to an inventory location, only the task of bringing in or clearing out the actual inventory products is attended to, it is possible to update a database loaded on the movable reading device, and no effort is needed to update this data; and  
         [0095]    The installation and administration of an inventory control center is unnecessary, and tools, a location, and staff need not be secured.  
         [0096]    Reference Numbers  
         [0097]    [0097] 1 : electronic tag  
         [0098]    [0098] 21 - 25 : movable reader  
         [0099]    [0099] 3 : floor  
         [0100]    [0100] 4 : communication antenna