Patent Publication Number: US-10773844-B2

Title: Bag stocker and bag supply method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2017-223052, filed on Nov. 20, 2017; the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a bag stocker for storing a plurality of bags, and to a bag supply method using such a bag stocker. 
     BACKGROUND ART 
     Bag processing devices such as a bag-filling and packaging machine and a spout attaching machine perform various types of processing by continuously using a plurality of bags. For this reason, it is necessary to continuously supply an empty bag to the bag processing device at an appropriate timing such that the processing in the bag processing device is not interrupted. 
     For example, a bag-filling and packaging machine disclosed in Japanese patent application publication No. 2000-191156 includes multiple stockers (namely, magazines) capable of stocking multiple empty bags. These stockers are arranged in parallel, all the stockers are laterally moved after all the empty bags stored in a stocker have been used, and empty bags stored in the next stocker are used in the bag-filling and packaging machine. When this bag-filling and packaging machine of Japanese patent application publication No. 2000-191156 is used, a worker can replenish a plurality of empty bags to the multiple stockers at one time, and thus, it is possible to reduce the number of times of replenishing empty bags per unit time. 
     Further, Japanese patent application publication No. 8-217236 discloses a device that stacks bag bundles on a tray one by one. Further, Japanese patent application publication No. 2000-296814 discloses a device that selectively and automatically installs a bag cassette containing a packaging bag onto a packaging device. 
     SUMMARY OF INVENTION 
     Technical Problem 
     When the bag processing device including the magazine is used, there is limit on the number of empty bags that can be stored in the magazine, and thus, the worker needs to replenish empty bags at an appropriate timing as necessary while continuously monitoring a storage state of the empty bags in the magazine. In practice, the worker needs to constantly replenish empty bags to the magazine while paying attention to the storage state of the empty bags in the magazine during an operation of the bag processing device in most cases. Thus, a burden on the worker regarding the replenishment of the empty bag is extremely great. 
     In particular, when the processing in the bag processing device is performed at high speed, the empty bags are also consumed at high speed, and thus, the burden on the work regarding the replenishment work of the empty bag further increases. Further, when a replenishment speed of the empty bag by the worker is slower than a processing speed of the bag processing device (that is, a consumption speed of the empty bag), the replenishment work of the empty bag becomes a bottleneck, which becomes an obstacle in improving the processing capability of the bag processing device. 
     As the empty bags are stored in the plurality of magazines as in the device of Japanese patent application publication No. 2000-191156, it is possible to increase the amount of stocking empty bags and to reduce the number of times of replenishing empty bags per unit time. In such a case, however, the worker needs to replenish empty bags to each magazine while moving a place, and thus, the burden on the worker regarding the replenishing work increases as the number of storable empty bags increases (that is, as a size of the magazine and the number of magazines increase). 
     Incidentally, the bag processing device does not necessarily include the magazine. In a bag processing device that does not include the magazine, it is necessary to timely supply new empty bags to the bag processing device so as to be linked with consumption of empty bags. Such supply of empty bags to the bag processing device is often performed manually, which is similar to the above-described replenishment of empty bags with respect to the magazine. Even in the case of manually supplying an empty bag to the bag processing device that does not include the magazine, the burden on the worker is extremely great. In particular, when the empty bag is not supplied to the bag processing device at an appropriate timing due to inattention of the worker or the like, the processing in the bag processing device is interrupted so that the processing efficiency deteriorates. 
     Further, for example, when multiple empty bags manufactured by a bag manufacturer are carried in the state of being accommodated in a cardboard box, there is a concern that foreign substances, such as a paper piece of the cardboard box and dust in the cardboard box, may soar at the time of taking an empty bag out of the cardboard box. Therefore, it is also required to prevent a supply place of the empty bag from being contaminated due to the foreign substances soaring at the time of taking out the empty bag. Further, frequent entry and exit of a human, such as the worker, into and from an installation place of the magazine and an installation place of a bag supply device that supplies an empty bag to the bag processing device, or the presence of the human itself is not desirable in some cases from the viewpoint of hygiene. In particular, when food, sanitary goods, or the like is to be accommodated in an empty bag, it is sometimes required to supply the empty bag in an environment such as a clean booth which has been highly purified, and it is not preferable for such a clean environment to be contaminated by the entry and exit or the presence of the human. 
     Further, in the device of Japanese patent application publication No. 8-217236, the bag bundle bound by a band is accommodated in the tray so as to extend in the horizontal direction, and the band is cut in a state where the bag bundle is stacked on the tray. Thereafter, a lower part of a bag group pushed up by a push-up device is gripped by a pair of parallel chucks, and the bag group is taken out of the tray. In this manner, in the device of Japanese patent application publication No. 8-217236, a series of steps such as cutting of the band, pushing-up of the bag group, and insertion of the parallel chucks into the lower part of the bag group is required in order to take the bag group out of the tray so that it takes time and labor and the bag bundle bound by the band is set as an object to be processed. In particular, a band engaging member is inserted between the band and an upper surface of the bag bundle to raise the band from the upper surface of the bag bundle in order to cut the band, and at that time, there is a concern that the upper surface of the bag bundle may be damaged by the band engaging member. 
     Further, in the device of Japanese patent application publication No. 2000-296814, a pin is inserted into a pin hole formed in a bag so that the packaging bags are accommodated in the bag cassette in a stacked state. In this manner, the pin hole needs to be formed in advance at a predetermined position in the bag handled by the device of Japanese patent application publication No. 2000-296814 so that types of applicable bags are limited. 
     The present invention has been made in view of the above circumstances, and an object thereof is to provide a device and a method capable of improving productivity while mitigating a burden on a worker regarding replenishment work or supply work of a bag. Further, still another object is to provide a device and a method capable of preventing contamination of a supply place of a bag. Further, still another object is to provide a device and a method capable of supplying a bag without causing a human to be present at a place where the bag is supplied to a bag supply device. Further, still another object is to provide a device and a method capable of easily taking a bag bundle, constituted by a group of a plurality of bags, out of an accommodating place. Further, another object is to provide a device and a method capable of taking out the bag bundle while preventing damage of a bag. Further, still another object is to provide a device and a method capable of flexibly coping with various types of bags. 
     Solution to Problem 
     One aspect of the present invention is directed to a bag stocker that holds a plurality of bags to be supplied to a bag supply device, the bag stocker comprising: a body portion provided to be movable; a plurality of bag accommodating units supported by the body portion; and a holding member which is provided in each of the plurality of bag accommodating units and supports a bag bundle including two or more bags, wherein each of the plurality of bag accommodating units is supported by the body portion to be movable in the body portion between an accommodating position and a withdrawing position where each of the plurality of bag accommodating units protrudes in comparison with each of the plurality of bag accommodating units arranged at the accommodating position. 
     Desirably, the holding member supports the bag bundle in an upright attitude. 
     Desirably, each of the two or more bags included in the bag bundle has a mouth portion, and the holding member supports the bag bundle in such a manner that the mouth portion of each of the two or more bags included in the bag bundle is directed upward in a vertical direction. 
     Desirably, each of the two or more bags included in the bag bundle has a mouth portion, and the holding member supports the bag bundle in such a manner that the mouth portion of each of the two or more bags included in the bag bundle is directed in a horizontal direction. 
     Desirably, the holding member supports the bag bundle in the state of exposing a part of the bag bundle. 
     Desirably, each of the plurality of bag accommodating units includes a holding portion for movement, and the corresponding bag accommodating portion is moved between the accommodating position and the withdrawing position by applying a force to the holding portion for movement. 
     Desirably, the body portion includes a caster. 
     Desirably, each of the plurality of bag accommodating units includes a plurality of holding members. 
     Desirably, the bag supply device is installed inside a supply room, the body portion is movable between an inside and an outside of the supply room, and the plurality of bag accommodating units are replenished with the bags outside of the supply room. 
     Desirably, the inside and the outside of the supply room are partitioned by a partition wall. 
     Desirably, the holding member externally supports the bag bundle, and the holding member supports the bag bundle in a state of exposing a part of one of a front surface and a back surface of each of a bag arranged on a frontmost side and a bag arranged on a backmost side of the two or more bags included in the bag bundle. 
     Desirably, front surfaces and back surfaces of the two or more bags included in the bag bundle are directed in a same direction, and the holding member supports the bag bundle in a state where a normal direction of the front surfaces and the back surfaces of the two or more bags is directed in a direction other than a direction parallel to a vertical direction which is a gravity acting direction. 
     Desirably, the bag bundle is placed on the holding member, and the holding member contacts at least a part of two sides adjacent to each other among a plurality of sides of each of the two or more bags included in the bag bundle. 
     Desirably, the body portion supports at least two or more of the plurality of bag accommodating units in the state where the at least two or more of the plurality of bag accommodating units are mutually aligned in a vertical direction. 
     Another aspect of the present invention is directed to a bag supply method including the steps of: replenishing a plurality of bags to a bag stocker; and supplying the plurality of bags from the bag stocker to a bag supply device, wherein: the bag stocker comprises: a body portion provided to be movable; a plurality of bag accommodating units supported by the body portion; and a holding member which is provided in each of the plurality of bag accommodating units and supports a bag bundle including two or more bags, each of the plurality of bag accommodating units is supported by the body portion to be movable in the body portion between an accommodating position and a withdrawing position where each of the plurality of bag accommodating units protrudes in comparison with each of the plurality of bag accommodating units arranged at the accommodating position, the plurality of bags replenished to the bag stocker are supported by the holding member in a form of the bag bundle in each of the plurality of bag accommodating units, and each of the plurality of bags to be supplied from the bag stocker to the bag supply device is a bag included in the bag bundle taken out of each of the plurality of bag accommodating units. 
     Desirably, each of the plurality of bag accommodating units includes a plurality of holding members. 
     According to a certain aspect of the present invention, it is possible to improve the productivity while mitigating the burden on the worker regarding the replenishment work or the supply work of the bag according to a certain aspect of the present invention. Further, it is possible to prevent the contamination of the bag supply place according to a certain aspect of the present invention. Further, it is possible to supply the bag without causing the human to be present at the place where the bag is supplied to the bag supply device according to a certain aspect of the present invention. Further, it is possible to easily take the bag bundle configured using a set of the plurality of bags out of the accommodating place. Further, it is possible to take out the bag bundle while preventing damage of the bag according to a certain aspect of the present invention. Further, it is possible to flexibly cope with various types of bags according to a certain aspect of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view illustrating an example of a bag; 
         FIG. 2  is a view for describing work of replenishing a plurality of bags to a bag stocker at a receiving position; 
         FIG. 3  is a view for describing work of setting the bag stocker storing the plurality of bag bundles to a taking-out position; 
         FIG. 4  is a view illustrating a state where a plurality of bag stockers are set at the taking-out position; 
         FIG. 5  is an enlarged view illustrating configuration examples of a bag transporting unit (pusher), a depositing unit, a magazine, a first bag pickup unit and a delivery unit; 
         FIG. 6  is a view for describing a step of supplying the plurality of bags from the bag stocker to a bag supply device; 
         FIG. 7  is a view for describing the step of supplying the plurality of bags from the bag stocker to the bag supply device; 
         FIG. 8  is a view for describing the step of supplying the plurality of bags from the bag stocker to the bag supply device; 
         FIG. 9  is a view for describing the step of supplying the plurality of bags from the bag stocker to the bag supply device; 
         FIG. 10  is a view illustrating a bag supply system according to a first application example; 
         FIG. 11  is a view illustrating a bag supply system according to a second application example; 
         FIG. 12  is a view illustrating a bag supply system according to a third application example; 
         FIG. 13  is a view relating to a first modification for describing a step of supplying a plurality of bags from a bag stocker to a bag supply device; 
         FIG. 14  is a view relating to the first modification for describing the step of supplying the plurality of bags from the bag stocker to the bag supply device; 
         FIG. 15  is a schematic view illustrating a bag accommodating unit and a holding member according to a second modification; 
         FIG. 16  is a schematic view illustrating a bag accommodating unit and a holding member according to a third modification; 
         FIG. 17  is a side view illustrating a bag stocker and a wagon lock device according to a fourth modification, which illustrates a non-locked state; 
         FIG. 18  is a side view illustrating the bag stocker and the wagon lock device according to the fourth modification, which illustrates a locked state; 
         FIG. 19  is a plan view of the bag stocker and the wagon lock device according to the fourth modification, which illustrates the non-locked state; 
         FIG. 20  is a plan view of the bag stocker and the wagon lock device according to the fourth modification, which illustrates the locked state; and 
         FIG. 21  is a side view illustrating a bag stocker according to a fifth modification, which illustrates a configuration inside the bag stocker. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Incidentally, elements illustrated in the drawings include elements not illustrated to have exactly the same size and shape among the drawings for the sake of convenience, but those skilled in the art can appropriately understand such elements, and further, can understand that each element may have various modifications. 
     In the following embodiment, as an example, a description will be given regarding an empty bag group supply system (bag supply system), configured to supply empty bags manufactured by a bag manufacturer to a magazine storing multiple empty bags (bags) to be supplied to a packaging machine (bag processing device). Specifically, an empty bag group accommodating wagon (bag stocker) capable of stacking the multiple empty bags and the empty bag group supply system using the empty bag group accommodating wagon will be described hereinafter. 
       FIG. 1  is a plan view illustrating an example of a bag B. A body portion Ba of the bag B illustrated in  FIG. 1  has a rectangular planar shape, and each of a front surface and a back surface of the bag B is configured using a surface of a region surrounded by a plurality of edges of the body portion Ba. A mouth portion Bb is formed at one of the plurality of edges of the bag B (see a reference sign “Bc 1 ” in  FIG. 1 ). The mouth portion Bb is a portion in which a through-hole communicating an inside and an outside of the bag B is formed or to be formed. Accordingly, at a stage where the bag B is replenished to the bag stocker, the bag supply device, and the bag processing device to be described later, a state where the inside and the outside of the bag B communicate with each other through the mouth portion Bb may be formed, or state where the inside and the outside of the bag B do not communicate with each other through the mouth portion Bb may be formed. A shape of the mouth portion Bb is not limited, and may be formed as a simple through-hole, or an instrument such as a spout may be attached to the mouth portion Bb. 
     The bag B to which the device and method to be described below can be applied is not limited to the form of the bag B illustrated in  FIG. 1 . For example, the bag B illustrated in  FIG. 1  includes a pair of short edges and a pair of long edges, but the lengths of all the edges may be equal to each other. Further, the mouth portion Bb illustrated in  FIG. 1  is formed at the short edge, but may be formed at the long edge, or can be formed at an arbitrary edge. Further, the planar shape of the bag B may be a polygonal shape other than the quadrangular shape, or at least a part of the edge of the bag B may curve. 
     Next, a description will be given regarding an example of a bag supply system  10 , which includes a bag stocker  11  (moving unit) to which a plurality of the bags B are replenished and a bag supply device  12  to which the plurality of bags B are supplied from the bag stocker  11 , and an example of a bag supply method using the bag supply system  10 . 
       FIG. 2  is a view for describing work of replenishing the plurality of bags B to the bag stocker  11  at a receiving position P 2 .  FIG. 3  is a view for describing work of setting the bag stocker  11  storing a plurality of bag bundles B 1  to a taking-out position P 1 .  FIG. 4  is a view illustrating a state where a plurality of the bag stockers  11  are set at the taking-out position P 1 .  FIG. 5  is an enlarged view illustrating configurations of a bag transporting unit  36  (pusher P), a depositing unit  33 , a magazine  34 , a first bag pickup unit  35 , and a delivery unit  37 . 
     [Bag Supply System] 
     The bag supply system  10  includes the bag stocker  11  and the bag supply device  12 . The bag stocker  11  holds the plurality of bags B to be supplied to the bag supply device  12 . In particular, the bag stocker  11  of the present embodiment serves as the moving unit that moves a bag accommodating unit  21  to a bag bundle replenishment position (that is, the receiving position P 2 ) where the bag bundle B 1  is supplied to the bag accommodating unit  21  and a bag bundle supply position (that is, the taking-out position P 1 ) where the bag bundle B 1  is taken out of the bag accommodating unit  21 . The bag supply device  12  is installed inside a supply room R, and the plurality of bags B are supplied from the bag stocker  11  arranged at the bag bundle supply position (taking-out position P 1 ). As described above, the bag supply device  12  according to the present embodiment sequentially delivers the bags B toward the bag processing device (not illustrated) such as the packaging machine that performs processing using the bag B. 
     [Bag Stocker] 
     The bag stocker  11  includes a body portion  20  that is provided to be movable between the inside (taking-out position P 1 ) and the outside (receiving position P 2 ) of the supply room R, and the body portion  20  supports the plurality of bag accommodating units (withdrawing portions)  21 . Each of the bag accommodating units  21  includes one or a plurality of holding members  22  (the illustrated bag accommodating unit  21  includes the plurality of holding members  22 ) to support the bag bundle B 1 . Typically, the inside (taking-out position P 1 ) and the outside (receiving position P 2 ) of the supply room R are partitioned by a partition wall (not illustrated), and the inside of the supply room R has a structure in which a closed space can be formed. However, the inside of the supply room R is not necessarily a completely closed space, and the inside of the supply room R may communicate with the outside. Further, if the taking-out position P 1  (inside of the supply room R) and the receiving position P 2  (outside of the supply room R) are sufficiently separated, the inside (taking-out position P 1 ) and the outside (receiving position P 2 ) of the supply room R are not necessarily partitioned by the partition wall. Therefore, the taking-out position P 1  and the receiving position P 2  may be provided at positions separated from each other by a distance where the influence (for example, dispersion of foreign substances such as dust) exerted on the taking-out position P 1  by work at the receiving position P 2  (for example, replenishment work of the bag B) can be substantially ignored. 
     The body portion  20  includes a plurality of casters  23  (wheels) at a bottom (lower end surface). As the casters  23  are rolled on a floor surface, the entire bag stocker  11  can be freely moved between the inside (taking-out position P 1 ) and the outside (receiving position P 2 ) of the supply room R. Incidentally, a drive source configured to move the body portion  20  (that is, the bag stocker  11 ) is not limited, and a machine may be used as the drive source, or a man power of a worker W may be used as the drive source. 
     The plurality of bag accommodating units  21  are provided, and each of the plurality of bag accommodating units  21  is replenished with the bag B outside the supply room R. Each of the bag accommodating units  21  is supported by the body portion  20  so as to be movable between an accommodating position Pa and a withdrawing position Pb protruding from the bag accommodating unit  21 , arranged at the accommodating position Pa, in the body portion  20 . Each of the illustrated bag accommodating units  21  is provided to be slidable in the horizontal direction between the accommodating position Pa and the withdrawing position Pb with respect to the body portion  20 . In the bag stocker  11 , the plurality of bag accommodating units  21  are arranged so as to be aligned in a vertical direction (that is, in a stacking direction). A plurality of bag accommodating units  21  arranged at the accommodating position Pa are arranged at positions overlapping with each other in the vertical direction, and a plurality of bag accommodating units  21  arranged at the withdrawing position Pb are arranged at positions overlapping with each other in the vertical direction. As the plurality of bag accommodating units  21  are arranged to be aligned in the vertical direction in this manner, it is possible to form the bag stocker  11  to be compact in the horizontal direction. Further, as each of the bag accommodating units  21  is configured so as to be slidable in the horizontal direction, it is possible to move each of the bag accommodating units  21  from the accommodating position Pa to the withdrawing position Pb so as to expose a place (particularly each of the holding members  22 ) where the bag bundle B 1  (bag B) is placed if necessary. As a result, it is possible to smoothly perform the replenishment of the plurality of bags B (the bag bundle B 1 ) to each of the bag accommodating units  21  and the taking of the plurality of bags B (the bag bundle B 1 ) out of each of the bag accommodating units  21 . 
     Each of the holding members  22  is a member configured to externally support the bag bundle B 1 . The bag bundle B 1  includes two or more bags B (in general, several to tens of bags B), and front surfaces and back surfaces of the two or more bags B included in the bag bundle B 1  are directed in the same direction, and these bags B are integrally arranged to be superimposed on each other, thereby forming the bag bundle B 1 . In the present embodiment, each of the holding members  22  supports the bag bundle B 1  in a state where the direction (that is, the normal direction) of the front surfaces and the back surfaces of the two or more bags B are directed in a direction other than a direction parallel to the vertical direction which is a gravity action direction. That is, the bag bundle B 1  (that is, the two or more bags B) is supported by the holding member  22  so as to extend in a direction other than the horizontal direction. In particular, each of the holding members  22  externally supports the bag bundle B 1  in the state of contacting a part of an outer surface of the bag bundle B 1  without passing through the bag bundle B 1 . As the bag bundle B 1  is externally supported in this manner, it is possible to flexibly cope with various types of the bags B (bag bundles B 1 ) regardless of the presence or absence of a through-hole in each of the bags B. For example, it is also possible to support a plurality of types of bags B (bag bundles B 1 ) having different sizes and shapes appropriately by using the common holding member  22 . Each of the illustrated holding members  22  supports the corresponding bag B in an upright attitude. The upright attitude referred to herein is an attitude in which each of the bags B included in the bag bundle B 1  extends in the substantially vertical direction, and is an attitude in which the front surface and the back surface of each of the bags B are directed in the direction other than the vertical direction. Therefore, an inclined attitude in which each of the bags B extends to be inclined with respect to both the vertical direction and the horizontal direction is also included in the upright attitude in the broad sense. Further, each of the holding members  22  of the illustrated bag stocker  11  supports the corresponding bag bundle B 1  such that the mouth portions Bb of the two or more bags B included in the corresponding bag bundle B 1  are directed upward in the vertical direction. 
     However, the attitude of a bag B supported by each of the holding members  22  is not limited, and each of the holding members  22  may support a bag B having a horizontal attitude. Here, the horizontal attitude is an attitude in which each of the bags B included in a bag bundle B 1  extends generally in the horizontal direction, and the front surface and the back surface of each of the bags B are directed generally in the vertical direction. Also, the direction in which the mouth portion Bb of each of the bags B included in the bag bundle B 1  supported by each of the holding members  22  is directed is not limited. 
     Each of the holding members  22  supports the corresponding bag bundle B 1  from both the front surface side and the back surface side in the state of exposing a part (particularly, a part of each of the front surface and the back surface) of the corresponding bag bundle B 1 . That is, each of the holding members  22  supports the bag bundle B 1  in the state of exposing a part of either the front surface or the back surface (that is, a surface that is positioned opposite to a side where the adjacent bag B is arranged and directed outward between the front surface and the back surface) of each of the bag B arranged on the frontmost side and the bag B arranged on the backmost side between the two or more bags B included in the bag bundle B 1 . Each of the illustrated holding members  22  includes four rod-like members erected in the vertical direction, and supports the bag bundle B 1  by causing a front surface side and a back surface side of one end portion of the bag bundle B 1  to be sandwiched by the two rod-like members and causing a front surface side and a back surface side of the other end portion to be sandwiched by the other two rod-like members. As each of the holding members  22  supports the bag bundle B 1  in the state of exposing a part of the bag bundle B 1  in this manner, it is easy to grip the bag bundle B 1  at the time of taking the bag bundle B 1  out of the bag stocker  11 . 
     Incidentally, each of the illustrated holding members  22  is constituted by a plurality of pins arranged apart from each other, but the configuration of each of the holding members  22  is not limited. For example, each of the holding members  22  may be configured by erecting one or two or more plate-like members, or each of the holding members  22  may be configured using a box-like member capable of accommodating the bag bundle B 1 . When the pins are used as each of the holding members  22  as illustrated in the drawing, each of the holding members  22  may be constituted by pins shorter than the bag bundle B 1  with respect to the vertical direction in each of the bag accommodating units  21  such that an upper part of the bag bundle B 1  in the upright attitude is not held by the pins, for example. Further, when the plate-like member or the box-like member is used as each of the holding members  22 , each of the holding members  22  may be configured using a plate-like member or a box-like member shorter than the bag bundle B 1  in the vertical direction in each of the bag accommodating units  21 . Further, a cutout may be formed in the plate-like member or the box-like member forming each of the holding members  22 , and a part of the corresponding bag bundle B 1  may be exposed through the cutout. 
     Each of the bag accommodating units  21  includes a holding portion for movement  24 , and the corresponding bag accommodating unit  21  is moved between the accommodating position Pa and the withdrawing position Pb as a force is applied to the holding portion for movement  24 . Although the illustrated holding portion for movement  24  has the form of a so-called handle, the form of the holding portion for movement  24  is not limited, and can have an arbitrary form (for example, a convex portion, a concave portion and/or a hole portion) suitable for holding (for example, engaging) a movement device (in the present embodiment, a bag holding unit  41  of a taking-out unit  31 ). 
     When moving the plurality of bag accommodating units  21  from the bag bundle replenishment position (receiving position P 2 ) to the bag bundle supply position (taking-out position P 1 ), the bag stocker  11  moves the plurality of bag accommodating units in a state where at least two or more bag accommodating units among the plurality of bag accommodating units  21  are aligned in mutually vertical directions. 
     A plurality (preferably three or more) of the bag stockers  11  having the above-described configuration is provided. In particular, it is preferable that the bag stocker  11  allocated to the bag supply device  12  can be arranged at the taking-out position P 1  while arranging the other bag stocker  11  at the receiving position P 2 . In this case, while the bag B is being supplied to the bag supply device  12  at the taking-out position P 1 , the bag B can be replenished with respect to the bag stocker  11  at the receiving position P 2 . Although the two bag stockers  11  can be allocated to the single bag supply device  12  in the illustrated bag supply system  10 , three or more bag stockers  11  may be allocated to the single bag supply device  12 , or only one bag stocker  11  may be allocated to the single bag supply device  12 . 
     [Bag Supply Device] 
     The bag supply device  12  illustrated in  FIGS. 3, 4 , and the like is provided inside the supply room R, and the plurality of bags B are sequentially supplied from each of the plurality of bag stockers  11 . That is, the plurality of bags B are supplied to the bag supply device  12  from a certain bag stocker  11  among the plurality of bag stockers  11  arranged at the taking-out position P 1 . When the bag B is exhausted in the certain bag stocker  11 , the plurality of bags B are supplied from the other bag stocker  11  to the bag supply device  12 . The bag supply device  12  includes the taking-out unit  31 , an arrangement adjustment unit  32 , the depositing unit  33 , the bag transporting unit  36 , the magazine  34 , the first bag pickup unit  35 , and the delivery unit  37 . 
     [Taking-Out Unit] 
     The taking-out unit  31  is installed near the taking-out position P 1  where the bag stocker  11  is arranged inside the supply room R, takes the bag bundle B 1  out of the bag stocker  11 , and carries the bag bundle B 1  to the depositing unit  33 . Further, the taking-out unit  31  of the present embodiment also functions as the movement device that moves the corresponding bag accommodating unit  21  from the accommodating position Pa to the withdrawing position Pb by applying a force to the holding portion for movement  24 . Although the taking-out unit  31  also functions as the movement device in the present embodiment, a movement device as a separate body from the taking-out unit  31  may be provided. 
     The illustrated taking-out unit  31  is configured as a robot hand, and includes the bag holding unit  41  capable of holding and releasing the bag bundle B 1 , and a three-dimensional moving unit  42  that three-dimensionally moves the bag holding unit  41 . 
     The illustrated bag holding unit  41  is constituted by a pair of clamping members attached to a distal end portion of the three-dimensional moving unit  42  and provided so as to be opened and closed using an air cylinder (not illustrated) as a drive source. The bag holding unit  41  of the present embodiment not only can clamp and release the bag bundle B 1  but also can hold the holding portion for movement  24  of each of the bag accommodating units  21 . Incidentally, the pair of clamping members configured to hold the bag bundle B 1  and an engaging portion configured to hold the holding portion for movement  24  are provided as separate bodies in the illustrated bag holding unit  41 . 
     The illustrated three-dimensional moving unit  42  is configured as an arm unit that three-dimensionally moves the bag holding unit  41 . Although the illustrated three-dimensional moving unit  42  is configured using an articulated robot, a specific configuration of the three-dimensional moving unit  42  is not limited, and may be configured, for example, using another device such as a parallel link robot. 
     The taking-out unit  31  of the present embodiment having the above-described configuration delivers the bag bundle B 1 , taken out of the bag stocker  11 , to the arrangement adjustment unit  32 , receives the bag bundle B 1  of which arrangement position has been adjusted by the arrangement adjustment unit  32  from the arrangement adjustment unit  32 , and carries the bag bundle B 1 , received from the arrangement adjustment unit  32 , to the depositing unit  33 . 
     [Arrangement Adjustment Unit (Positioning Means)] 
     The arrangement adjustment unit  32  adjusts the mutual arrangement positions of the two or more bags B included in the bag bundle B 1  received from the taking-out unit  31 . 
     The illustrated arrangement adjustment unit  32  includes an arrangement adjustment placement portion  44  on which the bag bundle B 1  is placed and a position adjustment member  45  which adjusts positions of the two or more bags B included in the bag bundle B 1  on the arrangement adjustment placement portion  44 . The arrangement adjustment placement portion  44  supports the placed bag bundle B 1  in a horizontal attitude. Although a shape of the arrangement adjustment placement portion  44  is not limited, the illustrated arrangement adjustment placement portion  44  is partially cut out in order to prevent interference with the taking-out unit  31  (particularly the bag holding unit  41 ). The position adjustment member  45  is movably provided using an air cylinder (not illustrated) as a drive source. Specifically, the position adjustment member  45  includes a pair of side wall members, and is configured to be movable between a correction position to abut on the two or more bags B included in the bag bundle B 1  on the arrangement adjustment placement portion  44  from both sides and adjust the arrangement positions of the two or more bags B, and a separation position to be separated from the two or more bags B included in the bag bundle B 1  on the arrangement adjustment placement portion  44 . 
     Incidentally, the bag bundle B 1  of the present embodiment is carried from the bag stocker  11  (that is, the bag accommodating unit  21 ) to the depositing unit  33  via the arrangement adjustment unit  32 , but the arrangement adjustment unit  32  is not necessarily provided, and the bag bundle B 1  may be directly carried from the bag stocker  11  to the depositing unit  33 . 
     [Depositing Unit] 
     The depositing unit  33  includes a transport placement portion  47  on which the bag bundle B 1  is placed by the taking-out unit  31  and a transport guide portion  48  which guides the bag bundle B 1  on the transport placement portion  47 . 
     The transport placement portion  47  is a support member capable of supporting the bag bundle B 1  supplied via the taking-out unit  31  in a horizontal attitude. The transport guide portion  48  is constituted by a pair of plate-like members guiding both side edges of the bag bundle B 1  on the transport placement portion  47 , and guides the bag bundle B 1  toward an inside of the magazine  34  provided on the downstream side. In particular, the illustrated transport guide portion  48  contacts an edge, which is not provided with the mouth portion Bb, among the plurality of edges of the two or more bags B included in the bag bundle B 1  on the transport placement portion  47  and guides the bag bundle B 1 . Incidentally, the transport placement portion  47  and the transport guide portion  48  have a structure that does not interfere with the bag transporting unit  36  (for example, the pusher P moving forward and backward). 
     [Bag Transporting Unit] 
     The bag transporting unit  36  transports the bag bundle B 1  from the depositing unit  33  to be accommodated in the magazine  34 . That is, the bag transporting unit  36  transports the bag bundle B 1  on the transport placement portion  47  along the transport guide portion  48  and accommodates the bag bundle B 1  in the magazine  34 . 
     The illustrated bag transporting unit  36  is arranged to be adjacent to the depositing unit  33  and has the pusher P that pushes out the bag bundle B 1  on the transport placement portion  47  toward the magazine  34 . The pusher P is provided so as to be movable in the substantially horizontal direction between an escape position and a pushing-out position using an air cylinder (not illustrated) as a drive source. The pusher P arranged at the escape position is separated from the bag bundle B 1  on the transport placement portion  47 . Then, the pusher P moves toward the pushing-out position from the escape position, thereby pushing the bag bundle B 1  on the transport placement portion  47  toward the magazine  34 . 
     The bag supply device  12  has a configuration in which the taking-out unit  31  and other devices such as the bag transporting unit  36  (pusher P) do not interfere with each other when carrying the bag bundle B 1  to the depositing unit  33  by the taking-out unit  31 . The illustrated depositing unit  33  is provided so as to be movable up and down in the vertical direction by a motor (not illustrated) or the like, and can be arranged at an ascending position where the bag bundle B 1  is received from the taking-out unit  31  and the bag bundle B 1  is placed on the transport placement portion  47  or at a descending position where the bag bundle B 1  on the transport placement portion  47  is pushed out toward the magazine  34  by the bag transporting unit  36  (pusher P). 
     Incidentally, the bag supply device  12  can adopt other arbitrary configurations for preventing unintentional interference between the taking-out unit  31  and the bag transporting unit  36  (pusher P), or the like. For example, when the bag bundle B 1  is carried to the depositing unit  33  by the taking-out unit  31 , the pusher P (bag transporting unit  36 ) may be arranged at the escape position where a space, which enables the taking-out unit  31  (particularly, the bag holding unit  41 ) to be arranged at a position adjacent to the depositing unit  33 , is provided. 
     [Magazine] 
     The magazine  34  is arranged to be adjacent to the depositing unit  33  and holds the accommodated bag bundle B 1  to be movable up and down. The illustrated magazine  34  includes: a magazine placement portion  50  that supports the bag bundle B 1  fed from the depositing unit  33  by the bag transporting unit  36  (that is, the pusher P) in a horizontal attitude; a pair of magazine guide portions  51  that guides both side edges of the bag bundle B 1  on the magazine placement portion  50  so as to freely ascend; and a magazine stopper  52  that regulates movement of the bag bundle B 1  caused by the bag transporting unit  36  (pusher P). The magazine placement portion  50  is provided so as to be movable up and down using a servo motor (not illustrated) as a drive source, and can make a vertical position of a bag B at the uppermost position between the two or more bags B included in the accommodated bag bundle B 1  substantially the same at all times. Therefore, the magazine placement portion  50  gradually ascends as the bag B is taken out of the magazine  34 . Further, when a new bag bundle B 1  is supplied to the magazine  34 , the magazine placement portion  50  descends and a space configured to arrange the new bag bundle B 1  is formed in the magazine  34 . 
     Incidentally, it suffices that it is possible to form a space having a size corresponding to at least one bag bundle B 1  in the magazine  34 , and it is also possible to form a space having a size corresponding to the plurality of bag bundles B 1 . As the magazine  34  enables formation of the space having the size corresponding to the plurality of bag bundles B 1 , it is possible to continuously perform the process of conveying the bag B from the magazine  34  to the subsequent stage using the first bag pickup unit  35  without interruption for a long time. Therefore, while the plurality of bags B in the magazine  34  are being conveyed to the subsequent stage by the first bag pickup unit  35 , it is also possible to finish carrying the new bag bundle B 1  from the bag stocker  11  to the depositing unit  33 , so that it is possible to efficiently carry the bag bundle B 1  (bags B). Incidentally, the magazine  34  illustrated in  FIGS. 2 to 5  can form a space capable of accommodating three bag bundles B 1 . 
     [First Bag Pickup Unit and Delivery Unit] 
     The first bag pickup unit  35  takes out the two or more bags B included in the bag bundle B 1  accommodated in the magazine  34  one by one, and specifically, takes out the bag B arranged at the uppermost position of the bag bundle B 1  one piece at a time. The first bag pickup unit  35  can be configured using, for example, a sucker or the like. In the bag supply device  12  illustrated in  FIGS. 2 to 5 , the bag B taken out by the first bag pickup unit  35  is delivered to the delivery unit  37  and fed to the subsequent stage by the delivery unit  37 . 
     Incidentally, the delivery unit  37  is not necessarily provided, and the first bag pickup unit  35  may directly deliver the bag B to the subsequent device or the like, or the bag B may be fed to the subsequent stage from the first bag pickup unit  35  via a device or the like other than the delivery unit  37 . 
     Only one set of the bag transporting unit  36  (pusher P), the depositing unit  33 , magazine  34 , the first bag pickup unit  35 , and the delivery unit  37  described above may be provided, or a plurality of the sets may be provided. The bag supply device  12  illustrated in  FIGS. 3 to 5  includes the four sets, and the number of each of the bag transporting units  36  (pushers P), the depositing units  33 , the magazines  34 , the first bag pickup units  35 , and the delivery units  37  is four. 
     [Bag Supply Method] 
     Next, the bag supply method performed using the above-described bag supply system  10  will be described. 
     The bag supply method of the present embodiment includes a step of replenishing the plurality of bags B to the bag stocker  11  and a step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12 . In particular, in the illustrated bag supply system  10 , the plurality of bags B are replenished to the bag stocker  11  outside the supply room R, and the plurality of bags B are supplied to the bag supply device  12  from the bag stocker  11  inside the supply room R. 
     The plurality of bags B replenished to the bag stocker  11  are stored in the form of the bag bundle B 1  supported by the plurality of holding members  22  in each of the plurality of bag accommodating units  21 . Then, each of the plurality of bags B to be supplied from the bag stocker  11  to the bag supply device  12  is the bags B included in the bag bundle B 1  taken out of each of the plurality of holding members  22 . 
     Hereinafter, each step included in the bag supply method will be described. 
     [Bag Group Supply Step] 
     A step of replenishing the plurality of bags B to the bag stocker  11  include: a step of sequentially moving the plurality of bag accommodating units  21  from the accommodating position Pa to the withdrawing position Pb in the body portion  20 ; a step of supplying the plurality of bags B to the bag accommodating unit  21  arranged at the withdrawing position Pb and supporting each of the plurality of bags B as the bag bundle B 1  by each of the plurality of holding members  22 ; and a step of moving the bag accommodating unit  21  in a state where each of the plurality of corresponding holding members  22  supports the bag bundle B 1  from the withdrawing position Pb to the accommodating position Pa (see  FIG. 2 ). 
     Specifically, the plurality of bags B are replenished to the bag stocker  11  as follows. 
     A first step: A predetermined number (for example, any of one to three) of bag stockers  11  are stopped and arranged at the predetermined receiving position P 2  outside the supply room R. At this time, each of the bag accommodating units  21  is arranged at the accommodating position Pa and is in an empty state where the bag B is not stored. 
     A second step: The bag accommodating unit  21  as a target to which a new bag B is supplied is moved from the accommodating position Pa to the withdrawing position Pb. At this time, the movement of the target bag accommodating unit  21  may be performed by the worker W, or may be performed by a machine (not illustrated). 
     A third step: The plurality of bags B are replenished to the bag accommodating unit  21  arranged at the withdrawing position Pb, and the plurality of bags B are supported in the form of the bag bundle B 1  by the holding members  22  in the upright attitude. At this time, the replenishment of the plurality of bags B may be performed by the worker W, or may be performed by a machine (not illustrated). When the plurality of bags B are replenished by the worker W, for example, the worker W may take an arbitrary number of bags B out of a cardboard box  25  accommodating a large amount of the bags B and appropriately accommodate the bags B in each of the bag accommodating units  21  in the form of the bag bundle B 1 . 
     A fourth step: The bag accommodating unit  21  to which a predetermined number of bag bundles B 1  has been replenished is moved from the withdrawing position Pb to the accommodating position Pa. At this time, the movement of the target bag accommodating unit  21  may be performed by the worker W, or may be performed by a machine (not illustrated). 
     The above first to fourth steps are performed with respect to all the bag accommodating units  21  of the bag stocker  11 , and the plurality of bag bundles B 1  are accommodated in all of the bag accommodating units  21 . In this manner, the replenishment of the plurality of bags B to the single bag stocker  11  is performed. 
     Incidentally, when there are two or more bag stockers  11  for which the replenishment of the plurality of bags B is necessary, the above-described series of steps is performed for each of the bag stockers  11 . 
     [Bag Stocker Movement Step] 
     The bag stocker  11  for which the replenishment of the plurality of bags B has been completed is moved on the floor from the predetermined receiving position P 2  and stopped at the predetermined taking-out position P 1  inside the supply room R (see  FIGS. 2 and 3 ). At this time, the movement of the bag stocker  11  may be performed by the worker W, or may be performed by a machine (not illustrated). 
     Next, a step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12  will be described.  FIGS. 6 to 9  are views for describing the step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12 . 
     [Withdrawing Portion Withdrawal Step] 
     The step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12  includes a step of causing the movement device to apply a force to the holding portion for movement  24  so as to move the corresponding bag accommodating unit  21  from the accommodating position Pa to the withdrawing position Pb (see  FIG. 6 ). In the illustrated device, the bag holding unit  41  of the taking-out unit  31  serving as the movement device is held (engaged) by the holding portion for movement  24 , and the bag holding unit  41  is moved by the three-dimensional moving unit  42  to apply the force to the holding portion for movement  24  so as to move the corresponding bag accommodating unit  21  from the accommodating position Pa to the withdrawing position Pb. 
     After the corresponding bag accommodating unit  21  has been moved to the withdrawing position Pb, the holding of the bag holding unit  41  with respect to the holding portion for movement  24  is released, and the bag holding unit  41  is separated from the holding portion for movement  24 . 
     [Bag Group Taking-Out Step] 
     The taking-out unit  31  causes the bag bundle B 1  stored in the bag accommodating unit  21  arranged at the withdrawing position Pb to be sandwiched by the bag holding unit  41  to hold the bag bundle B 1  (see  FIG. 7 ). The three-dimensional moving unit  42  moves the bag holding unit  41  in the state where the bag bundle B 1  is held by the bag holding unit  41 . In this manner, the bag bundle B 1  is taken out of the bag stocker  11  (that is, the bag accommodating unit  21 ). 
     [Bag Group Positioning Step] 
     The step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12  includes: a step (see  FIG. 8 ) of delivering the bag bundle B 1  taken out of the bag stocker  11  by the taking-out unit  31  to the arrangement adjustment unit  32 ; a step of causing the arrangement adjustment unit  32  to adjust the arrangement position of the bag bundle B 1 ; and a step (see  FIG. 9 ) of causing the taking-out unit  31  to receive the bag bundle B 1  of which arrangement position has been adjusted by the arrangement adjustment unit  32  from the arrangement adjustment unit  32  and to carry the received bag bundle B 1  to the depositing unit  33 . 
     That is, the bag bundle B 1  held by the bag holding unit  41  is arranged above the arrangement adjustment placement portion  44  in the horizontal attitude, and the bag bundle B 1  is released from the bag holding unit  41  to be placed on the arrangement adjustment placement portion  44 . At this time, the position adjustment member  45  is arranged at the separation position separated from the bag bundle B 1  on the arrangement adjustment placement portion  44 , and the operation of placing the bag bundle B 1  onto the arrangement adjustment placement portion  44  is not inhibited by the position adjustment member  45 . 
     Then, the position adjustment member  45  is moved from the separation position to the correction position so that positions of both side edges of the two or more bags B included in the bag bundle B 1  on the arrangement adjustment placement portion  44  are aligned. Such movement of the position adjustment member  45  from the separation position to the correction position may be performed only once or may be repeated a plurality of times. 
     Then, after the position adjustment of the bag bundle B 1  on the arrangement adjustment placement portion  44  has been performed, the position adjustment member  45  is arranged at the separation position, and the bag bundle B 1  on the arrangement adjustment placement portion  44  is held again by the bag holding unit  41  of the taking-out unit  31 . Incidentally, while the position adjustment of the bag bundle B 1  is being performed in the arrangement adjustment unit  32 , the bag holding unit  41  may be arranged at the same position, or may be kept at a position released to place the bag bundle B 1  on the arrangement adjustment placement portion  44 . Then, the bag holding unit  41  is moved from the arrangement adjustment unit  32  toward the depositing unit  33  by the three-dimensional moving unit  42  while holding the bag bundle B 1  by the bag holding unit  41 . The bag bundle B 1  is arranged on the transport placement portion  47  of the depositing unit  33  in the horizontal attitude, and released from the bag holding unit  41  to be placed on the transport placement portion  47 . 
     At this time, the depositing unit  33  ascends and receives the bag bundle B 1  from the taking-out unit  31  (that is, the bag holding unit  41 ) at the ascending position. After the bag bundle B 1  is placed on the transport placement portion  47 , the depositing unit  33  descends together with the bag bundle B 1 , and the depositing unit  33  is arranged at the descending position where the bag bundle B 1  on the transport placement portion  47  is substantially at the same vertical position as the pusher P. Meanwhile, the bag transporting unit  36  (that is, the pusher P) is arranged at a standby position, and does not inhibit the movement of the bag bundle B 1  onto the transport placement portion  47 . 
     Incidentally, when the arrangement adjustment unit  32  is not provided, the bag bundle B 1  may be directly carried from the bag stocker  11  (the bag accommodating unit  21 ) to the depositing unit  33  (the transport placement portion  47 ) by the taking-out unit  31 . 
     After the bag bundle B 1  is delivered from the taking-out unit  31  to the depositing unit  33 , the taking-out unit  31  moves so as to take out the other bag bundle B 1  stored in the bag stocker  11 . Then, the above-described bag group taking-out step and bag group positioning step are performed with respect to the other bag bundle B 1 , and the other bag bundle B 1  is carried to the depositing unit  33 . 
     [Bag Group Pushing-Out Step] 
     The bag bundle B 1  placed on the transport placement portion  47  is withdrawn in the horizontal direction toward the downstream magazine  34  by the bag transporting unit  36 . Specifically, as the pusher P is moved from the standby position to the pushing-out position, the bag bundle B 1  on the transport placement portion  47  on a movement path thereof is pushed out to the magazine  34 . At this time, the magazine placement portion  50  is arranged at the same position as the transport placement portion  47  or at a position lower than the transport placement portion  47  with respect to the vertical direction so that the bag bundle B 1  pushed out from above the transport placement portion  47  is smoothly placed on the magazine placement portion  50 . In particular, when the other bag bundle B 1  has been already placed on the magazine placement portion  50 , the vertical position of the magazine placement portion  50  is adjusted such that the uppermost surface of the other bag bundle B 1  is arranged at the same position as the transport placement portion  47  or the position lower than the transport placement portion  47 . 
     After the bag bundle B 1  has been placed on the magazine  34 , the pusher P moves from the pushing-out position to the standby position and stands by at the standby position. 
     [Bag Supply Step] 
     The step of supplying the plurality of bags B from the bag stocker  11  to the bag supply device  12  includes a step of causing the first bag pickup unit  35  to take out the bag B arranged at the uppermost position of the bag bundle B 1  accommodated in the magazine  34 . 
     The illustrated first bag pickup unit  35  has a sucker, and the bag B at the uppermost position of the bag bundle B 1  supported by the magazine  34  is sucked by the sucker to be taken out upward. A suction operation and a suction-releasing operation of the sucker of the first bag pickup unit  35  are controlled by a control portion (not illustrated). 
     Incidentally, the magazine placement portion  50  ascends along with the taking-out of the bag B by the first bag pickup unit  35 . As a result, it is possible to keep the vertical position of the bag B arranged at the uppermost position of the bag bundle B 1  supported by the magazine  34  substantially constant. Therefore, the first bag pickup unit  35  can hold the bag B at a substantially fixed position and take out the bag B from the magazine  34 , and thus, it is possible to simplify the operation of the first bag pickup unit  35  and to improve the holding accuracy of the bag B. 
     The first bag pickup unit  35  delivers the bag B taken out of the magazine  34  to the delivery unit  37 , and the delivery unit  37  feeds the bag B toward a device at the subsequent stage. Incidentally, a specific configuration of the delivery unit  37  is not limited. The illustrated delivery units  37  are arranged side by side in the vertical direction such that two sets of endless belts wound around two drive rollers face each other. The first bag pickup unit  35  supplies the bag B from the magazine  34  between these endless belts of the delivery unit  37 . As these endless belts are run by the drive rollers in a state where the bag B is sandwiched between the endless belts of the delivery unit  37 , the bag B is conveyed toward the downstream side. 
     [Remarks] 
     Incidentally, various patterns of configurations and steps at the subsequent stages of the magazine  34  are conceivable, and are not limited. Typical examples of configurations and steps at the subsequent stages of the magazine  34  will be described later as application examples. 
     Further, the above-described bag group taking-out step to the bag group positioning step are performed while performing the above-described bag group pushing-out step and the subsequent steps (a step including the bag group pushing-out step and the bag supply step), and the other bag bundle B 1  can be carried from the bag stocker  11  to the depositing unit  33  while a certain bag bundle B 1  is being conveyed from the depositing unit  33  toward the downstream side. 
     Further, when all the bag bundles B 1  are taken out of a certain bag accommodating unit  21  in the bag group taking-out step, the bag accommodating unit  21  is moved from the withdrawing position Pb to the accommodating position Pa by the taking-out unit  31  (that is, the movement device). Then, the above-described withdrawing portion withdrawal step and bag group taking-out step are performed with respect to the other bag accommodating unit  21  accommodating the bag bundle B 1 . Then, the above-described withdrawing portion withdrawal step and bag group taking-out step are performed for all the bag accommodating units  21  of the bag stocker  11 . After the withdrawing portion withdrawal step and the bag group taking-out step have been performed for all the bag accommodating units  21  of one bag stocker  11 , the withdrawing portion withdrawal step and bag group taking-out step are performed with respect to another bag stocker  11 . Incidentally, the bag stocker  11 , which has become empty after all the bag bundles B 1  have been taken out, is moved from the taking-out position P 1  inside the supply room R to the receiving position P 2  outside the supply room R, and is replenished with a plurality of new bags B as the above-described bag group supply step is performed at the receiving position P 2 . At this time, the movement of the empty bag stocker  11  may be performed by the worker W or performed by a machine (not illustrated). 
     Incidentally, the taking-out unit  31  may take out the plurality of bag bundles B 1  stored in the bag stocker  11  (particularly, each of the bag accommodating units  21 ) in a predetermined order. Further, the taking-out unit  31  may take out each of the bag bundles B 1  based on a detection result of a sensor (for example, including an optical sensor and an imaging device) capable of detecting a position and/or the presence or absence of each of the bag bundles B 1  in the bag stocker  11  (that is, each of the bag accommodating units  21 ). 
     Further, the bag supply device  12  may include a sensor capable of detecting a position of each of the bag accommodating units  21  with respect to the body portion  20 , the presence or absence of the bag bundle B 1  in the arrangement adjustment unit  32 , the presence or absence of the bag bundle B 1  in the depositing unit  33 , a state of the bag transporting unit  36  (for example, a position of the pusher P), and/or the presence or absence of the bag bundle B 1  in the magazine  34 . Further, the bag supply device  12  may include a control unit (not illustrated) that controls at least one or more behaviors among the taking-out unit  31 , the arrangement adjustment unit  32 , the depositing unit  33 , the bag transporting unit  36 , the magazine  34 , the first bag pickup unit  35 , and the delivery unit  37  based on information on detection results sent from various sensors and the like. 
     As described above, according to the bag stocker  11 , the bag supply device  12 , and the bag supply system  10  of the present embodiment, it is possible to save labor and improve work efficiency while preventing the supply room R from being contaminated. That is, the contamination of the supply room R can be prevented by replenishing the new bag B outside the supply room by using the movable bag stocker  11 . Further, by using the plurality of bag stockers  11 , while the bag B is being taken out of one bag stocker  11 , the new bag B can be replenished to another bag stocker  11 , and thus, it is possible to improve the work efficiency. 
     Further, according to the bag supply system  10  and the bag supply method of the present embodiment, it is possible to easily take the bag bundle B 1  configured using the set of the plurality of bags B out of the bag accommodating unit  21 . Further, according to the bag supply system  10  and the bag supply method of the present embodiment, it is possible to reduce the damage of the bag B at the time of taking out the bag bundle B 1  and to flexibly cope with various types of bags. 
     Further, it is possible to supply the bag B without intervention of a person within a movable range of a machine such as the taking-out unit  31  by using the bag stocker  11 , and thus, the high-level safety can be secured. 
     Further, it is possible to stock a large amount of the bags B by providing the plurality of bag accommodating units  21  in the single bag stocker  11 . Thus, it is possible to suppress the frequency of moving the bag stocker  11 , which needs to be replenished with the new bag B, to the receiving position P 2 , and to remarkably mitigate the burden on the worker W. 
     Further, the arrangement positions of the two or more bags B included in each of the bag bundles B 1  are corrected by the arrangement adjustment unit  32 , there is no problem even if the positions of the bag bundle B 1  (that is, the bags B) are somewhat nonuniform in the bag stocker  11 . Therefore, a space defined by each of the holding members  22  may be set to be larger than the size of the bag bundle B 1 . In this case, it is possible to smoothly perform the replenishment work of the bag bundle B 1  to each of the bag accommodating units  21  and each of the holding members  22 , and further, it is possible to use the same holding member  22  and bag accommodating unit  21  even if sizes of each of the bags B and each of the bag bundles B 1  are changed. 
     Next, the application examples of the above-described bag stocker  11  (particularly, typical configuration examples on the downstream side of the magazine  34 ) will be described. Incidentally, the same or similar components as those of the above-described bag supply system  10  will be denoted by the same reference signs in the respective drawings illustrating the following application examples, and the detailed description thereof will be omitted. 
     First Application Example 
       FIG. 10  is a view illustrating a bag supply system  10  according to a first application example. 
     A bag supply device  12  according to the present application example includes: a bag conveying unit  61  that receives a bag B fed via a first bag pickup unit  35  and conveys the bag B toward the downstream side; a conveyance stopper  62  that regulates a position of the bag B conveyed by the bag conveying unit  61 ; and a second bag pickup unit  63  that takes out the bag B of which position is regulated by the conveyance stopper  62  and supplies the bag B to a bag processing device  100 . 
     The bag B taken out of a magazine  34  by the first bag pickup unit  35  is delivered to the bag conveying unit  61  having an endless conveyor belt via a delivery unit  37 . The bag conveying unit  61  conveys the bags B from the first bag pickup unit  35  one by one toward the downstream side by the conveyor belt. 
     The bag B conveyed toward the downstream side by the bag conveying unit  61  is positioned by the conveyance stopper  62  in the vicinity of a distal end portion of the conveyor belt. The bag B positioned by the conveyance stopper  62  is taken out by the second bag pickup unit  63  and is supplied to the bag processing device  100  (not illustrated) (for example, a bag transporting machine, a bag-filling and packaging machine, a spout sealing machine, or the like) provided at the subsequent stage. 
     Incidentally, the number of sets of the bag conveying unit  61 , the conveyance stopper  62 , and the second bag pickup unit  63  is the same as the number of sets of the magazine  34 , the first bag pickup unit  35 , and the delivery unit  37 . The illustrated bag supply device  12  is provided with four sets of the bag conveying unit  61 , the conveyance stopper  62 , and the second bag pickup unit  63 . 
     Second Application Example 
       FIG. 11  is a view illustrating a bag supply system  10  according to a second application example. 
     A first bag pickup unit  35  of the present application example directly supplies a bag B taken out of a magazine  34  to a bag processing device  100 . That is, a bag supply device  12  according to the present application example is not provided with a delivery unit  37 , and the bag B stored in the magazine  34  is directly delivered to the bag processing device  100  (not illustrated) by the first bag pickup unit  35 . 
     Incidentally, the illustrated bag supply device  12  is provided with only one set of a bag transporting unit  36  (pusher P), a depositing unit  33 , the magazine  34 , and the first bag pickup unit  35 . 
     Third Application Example 
       FIG. 12  is a view illustrating a bag supply system  10  according to a third application example. 
     A bag supply device  12  of the present application example includes a temporary holding unit  66 , a bag conveying unit  61 , a bag lifting unit  67 , a feeding unit  68 , a conveyance stopper  62 , and a second bag pickup unit  63 , but is not provided with a delivery unit  37 . 
     A bag B is delivered from a first bag pickup unit  35  to the temporary holding unit  66 , and the temporary holding unit  66  supports the bag B. The illustrated temporary holding unit  66  includes a sucker that sucks and holds the bag B, and fixedly supports the bag B. Incidentally, the temporary holding unit  66  may support the bag B while fixing a position of the bag B by applying a fixing force to the bag B, or the bag B may be just placed without application of the fixing force. The temporary holding unit  66  is provided to be movable in the horizontal direction, and reciprocates between a receiving position where the bag B is received from the first bag pickup unit  35  at a position that does not interfere with a magazine  34 , and a position where the bag B is delivered to the bag conveying unit  61  at a position that does not interfere with the bag B on the bag conveying unit  61 . 
     The bag conveying unit  61  includes an endless conveyor belt that continuously runs, and conveys the bag B fed via the temporary holding unit  66  toward the downstream side. The bag conveying unit  61  of the present application example conveys a plurality of the bags B in the state of overlapping each other toward the downstream side, and basically, a bag B on the downstream side is arranged at an upper overlapping position than a bag B on the upstream side. 
     When the temporary holding unit  66  supplies a new bag B to the bag conveying unit  61 , the bag lifting unit  67  lifts a rear position (that is, an upstream position) of a bag B at the rearmost side (that is, the most upstream side) on the bag conveying unit  61 . As a result, the new bag B supplied from the temporary holding unit  66  is inserted into a lower side of the bag B lifted by the bag lifting unit  67 , and is arranged at the rearmost side on the bag conveying unit  61 . Incidentally, the bag B delivered from the temporary holding unit  66  to the bag conveying unit  61  is conveyed to the downstream side along with running of the conveyor belt of the bag conveying unit  61 , and a rear portion (that is, an upstream portion) thereof is arranged immediately below the bag lifting unit  67 . 
     The conveyance stopper  62  regulates a position of a bag B at the head (that is, the most downstream side) among the plurality of bags B conveyed by the bag conveying unit  61 . Incidentally, the bag B arranged on the uppermost side among the plurality of bags B arranged to be superimposed on each other on the bag conveying unit  61  is normally a leading bag B, but there is a case where another bag B is arranged on the downstream side than the bag B arranged on the uppermost side along with the running of the conveyor belt of the bag conveying unit  61 . Even in such a case, the feeding unit  68  delivers the bag B, which is arranged on the uppermost side, to the downstream side to abut on the conveyance stopper  62 . 
     The feeding unit  68  is arranged above the bag conveying unit  61  at a position to abut on the bag B arranged on the uppermost side on the bag conveying unit  61 . The illustrated feeding unit  68  includes an endless conveyor belt. The bag B arranged on the uppermost side on the bag conveying unit  61  is sandwiched between the conveyor belt of the bag conveying unit  61  and the conveyor belt of the feeding unit  68 , and the bag B arranged on the uppermost side is delivered toward the downstream side by the conveyor belt of the feeding unit  68  to abut on the conveyance stopper  62 . Therefore, it is preferable that the conveyor belt of the feeding unit  68  be formed of a member capable of applying a large frictional force to the bag B. As the feeding unit  68  is provided in this manner, it is possible to surely deliver the bag B arranged on the uppermost side on the bag conveying unit  61  to the position of the conveyance stopper  62 . 
     Then, the bag B arranged on the uppermost side on the bag conveying unit  61  is taken out by the second bag pickup unit  63  at a position fixed by the conveyance stopper  62  to be supplied to the bag processing device  100  at the subsequent stage. 
     Incidentally, two sets of a depositing unit  33 , a bag transporting unit  36  (pusher P), the magazine  34 , the first bag pickup unit  35 , the temporary holding unit  66 , the bag lifting unit  67 , the bag conveying unit  61 , the feeding unit  68 , the conveyance stopper  62 , and the second bag pickup unit  63  are provided in the present application example. 
     [Modifications] 
     The present invention is not limited to the above-described embodiment and modifications. For example, various modifications may be made to the respective elements of the embodiment and the modifications described above. 
     [First Modification] 
       FIGS. 13 and 14  are views relating to a first modification for describing a step of supplying a plurality of bags B from a bag stocker  11  to a bag supply device  12 . In the present modification, the same or similar elements as those of the bag supply system  10  according to the above-described embodiment will be denoted by the same reference signs, and the detailed description thereof will be omitted. 
     Even in the present modification, each of bag bundles B 1  is supported by each of holding members  22  in an upright state in each of bag accommodating units  21  of the bag stocker  11 . However, each of the holding members  22  supports the corresponding bag bundle B 1  such that mouth portions Bb of two or more bags B included in the corresponding bag bundle B 1  are directed in the horizontal direction. That is, the bag bundle B 1  is supported by the corresponding holding member  22  such that a pair of short edges including an edge Bc 1  where the mouth portion Bb is formed is directed in the horizontal direction and extends in the vertical direction and that a pair of long edges where the mouth portion Bb is not formed is directed in the vertical direction and extends in the horizontal direction. 
     Each of the holding members  22  of the present modification has a box-like shape divided at an intermediate portion. That is, each of the holding members  22  has a pair of end portion holding portions. Each end portion holding portion has a shape corresponding to a shape of an end portion of the bag bundle B 1  and surrounds the end portion of the bag bundle B 1  from three sides. As a result, both the end portions of each of the bag bundles B 1  are supported by the pair of end portion holding portions of each of the holding members  22 , and each of the bag bundles B 1  is held in an upright state. 
     The bag supply device  12  of the present modification includes no arrangement adjustment unit  32 , and the bag bundle B 1  is directly carried from the bag stocker  11  (that is, the bag accommodating unit  21  arranged at a withdrawing position Pb) to a depositing unit  33 . 
     The depositing unit  33  is provided to be movable in the horizontal direction, and is provided to be arrangeable at a supply position Pc at which the bag bundle B 1  is delivered from a taking-out unit  31  (that is, a bag holding unit  41 ), and a discharge position Pd at which the bag bundle B 1  is delivered to the magazine  34 . The supply position Pc is a position where the taking-out unit  31  (particularly the bag holding unit  41 ) and a bag transporting unit  36  (for example, a pusher P) do not interfere with each other when the bag bundle B 1  is delivered from the taking-out unit  31  to the depositing unit  33 . The taking-out unit  31  can carry the bag bundle B 1  smoothly to the depositing unit  33  arranged at the supply position Pc and place the bag bundle B 1  at an appropriate position on a transport placement portion  47 . The discharge position Pd is a position adjacent to the magazine  34 , the position where the bag bundle B 1  on the transport placement portion  47  is arranged on a movement path of the pusher P. The pusher P can push the bag bundle B 1  accommodated in the depositing unit  33  arranged at the discharge position Pd toward the magazine  34  and smoothly accommodate the bag bundle B 1  in the magazine  34 . 
     Incidentally, a transport guide portion  48  of the depositing unit  33  guides the bag bundle B 1  in contact with the edge Bc 1  provided with at least the mouth portion Bb among the plurality of edges of the two or more bags B included in the bag bundle B 1  in the present modification. That is, the taking-out unit  31  places the bag bundle B 1  on the transport placement portion  47  such that the edge Bc 1  provided with the mouth portion Bb of the bag bundle B 1  and an edge opposing the edge Bc 1  oppose the transport guide portion  48  of the depositing unit  33 . Then, the pusher P pushes one edge adjacent to the edge provided with the mouth portion Bb of the bag bundle B 1  to accommodate the bag bundle B 1  in the magazine  34 . 
     As described above, each of the bag bundles B 1  is erected in a state where the mouth portion Bb is directed in the horizontal direction in the bag stocker  11  (that is, the bag accommodating unit  21 ) in the present modification. Thus, the plurality of bags B included in each of the bag bundles B 1  are in the state of being aligned with respect to the width direction due to the influence of gravity at the stage of being accommodated in the bag stocker  11 . Thus, even if the arrangement adjustment unit  32  (see  FIG. 3  and the like) of the above-described embodiment is not provided, it is possible to arrange the bag bundle B 1  in the depositing unit  33  in a state where the plural bags B are aligned with each other in the width direction. 
     Further, the pusher P pushes the bag bundle B 1  in the width direction in the present modification. Therefore, for example, when the pusher P pushes the bag bundle B 1  from the depositing unit  33  toward the magazine  34 , the bag bundle B 1  may be pushed against a side wall portion of the magazine  34 . In this case, it is possible to sandwich the bag bundle B 1  with the side wall portion of the magazine  34  and the pusher P and align positions in the width direction of the plurality of bags B included in the bag bundle B 1  in the magazine  34 . 
     Incidentally, the configuration of the subsequent stages of the magazine  34  is not limited, and may have the same configuration as that of each application example described above, for example. 
     [Second Modification] 
       FIG. 15  is a schematic view illustrating a bag accommodating unit  21  and a holding member  22  according to a second modification. The bag accommodating unit  21  and the holding member  22  illustrated in  FIG. 15  have been simplified in order to facilitate understanding. Therefore, for example,  FIG. 15  does not illustrate a holding portion for movement  24 . Further, the number and the holding members  22  provided on the bag accommodating unit  21  and a specific shape thereof are not limited to the numbers and shapes illustrated in  FIG. 15 . 
     In  FIG. 15 , a reference sign “Ds” indicates a sliding direction of the bag accommodating unit  21  in the horizontal direction, and particularly indicates the direction from the accommodating position Pa to the withdrawing position Pb in the bag stocker  11 . Further, the reference sign “Dp” indicates a direction perpendicular to the reference sign “Ds” in the horizontal direction and indicates the width direction of each of the bag accommodating units  21 . 
     In the present modification, each of the holding members  22  has a substantially L-shaped cross section, and a bag bundle B 1  is placed on the holding member  22 . Each of the holding members  22  contacts at least a part of two sides, adjacent to each other, among sides of each of two or more bags B included in the corresponding bag bundle B 1 . 
     The holding member  22  illustrated in  FIG. 15  supports the bag bundle B 1  in a state where the plurality of bags B constituting the bag bundle B 1  overlap each other in the sliding direction (refer to “Ds”) of the bag accommodating unit  21 . Further, the holding member  22  illustrated in  FIG. 15  supports the bag bundle B 1  in the state of contacting a bottom side Sb and a right side Sr, adjacent to each other in the vertical direction, among a top side St, a bottom side Sb, a left side SI and the right side Sr of the bag bundle B 1  (that is, each of the bags B). Further, the holding member  22  illustrated in  FIG. 15  supports the bag bundle B 1  in a state where the bottom side Sb of the bag bundle B 1  (that is, each of the bags B) is inclined with respect to the horizontal direction (particularly, the direction indicated by the reference sign “Dp”). Accordingly, the holding member  22  contacts a range including a place near a corner formed by one of the left side SI and the right side Sr (the right side Sr in  FIG. 15 ) and the bottom side Sb of the bag bundle B 1 . 
     According to the present modification, it is possible to completely expose both the place adjacent to the top side St and the place adjacent to the left side SI of each of the bag bundles B 1  in the state where each of the bag bundles B 1  is supported by the holding member  22 . Therefore, a taking-out unit  31  (see  FIG. 3  and the like) can hold not only the place adjacent to the top side St of each of the bag bundles B 1  but also the place adjacent to the left side SI, and it is possible to increase the degree of freedom of the mode of taking out the bag bundle B 1 . 
     Further, the bag bundle B 1  (that is, the respective bags B) is placed so as to be slidable along a supporting surface of the holding member  22  in the state of being placed on the corresponding holding member  22 , and thus, is arranged in the state of being accurately positioned on the corresponding holding member  22  under the influence of gravity. In particular, when the supporting surface of the holding member  22  is inclined with respect to the vertical direction or the supporting surface of the holding member  22  has a planar shape, it is possible to effectively promote such sliding movement of the bag bundle B 1  caused by the influence of gravity. Incidentally, the supporting surface of the holding member  22  preferably has a shape corresponding to a shape of the side of the contact place of the bag bundle B 1  (that is, the respective bags B), and is a planar shape in many cases, but does not necessarily coincide with the shape of the side of the contact place of the bag bundle B 1 . 
     Incidentally, the plurality of bags B constituting the bag bundle B 1  are stacked in the sliding direction (see “Ds”) of the bag accommodating unit  21  in  FIG. 15 , but the plurality of bags B constituting the bag bundle B 1  may be stacked in other directions, and for example, may be stacked in the direction indicated by the reference sign “Dp” or in the other horizontal direction. Further, the direction (that is, the normal direction) of the front surface and the back surface of each of the plurality of bags B constituting the bag bundle B 1  is directed substantially in the horizontal direction in  FIG. 15 , but these front and back surfaces may be directed in other directions. For example, the direction of the front surface and the back surface of each of the plurality of bags B constituting the bag bundle B 1  may be a direction other than the horizontal direction (direction other than the direction parallel to the vertical direction). 
     [Third Modification] 
       FIG. 16  is a schematic view illustrating a bag accommodating unit  21  and a holding member  22  according to a third modification.  FIG. 16  illustrates the bag accommodating unit  21  and the holding member  22  in a simplified manner similarly to  FIG. 15 , and does not illustrate a holding portion for movement  24 , for example. Further, in  FIG. 16 , a reference sign “Ds” indicates a sliding direction of the bag accommodating unit  21  in the horizontal direction (particularly, a direction from an accommodating position Pa in a bag stocker  11  to a withdrawing position Pb), a reference sign “Dp” indicates a direction (particularly, a width direction of each of the bag accommodating units  21 ) perpendicular to the reference sign “Ds” of the horizontal direction. 
     Each of the holding members  22  of the present modification supports a bag bundle B 1  so as to contact a front surface or a back surface of at least a bag B arranged downward in the vertical direction between a bag B arranged at the frontmost side and a bag B arranged on the backmost side among the two or more bags B included in the bag bundle B 1 . Further, each of the holding members  22  supports the bag bundle B 1  such that an upper end portion of the bag bundle B 1  with respect to the direction parallel to the vertical direction is arranged at a position apart from a lower end portion with respect to the direction Ds from the accommodating position Pa of the bag accommodating unit  21  toward the withdrawing position Pb. 
     Each of the holding members  22  illustrated in  FIG. 16  supports the bag bundle B 1  so as to contact both the bag B arranged at the frontmost side and the bag B arranged on the backmost side among the two or more bags B included in the corresponding bag bundle B 1 . 
     Each of the holding members  22  has a substantially L-shaped cross section, and a bag bundle B 1  is placed on the holding member  22 . The holding member  22  illustrated in  FIG. 16  supports the bag bundle B 1  in a state where the plurality of bags B constituting the bag bundle B 1  are stacked in a direction perpendicular to the direction indicated by the reference sign “Dp”. Further, the holding member  22  illustrated in  FIG. 16  supports the bag bundle B 1  in the state of contacting a bottom side Sb among sides of the bag bundle B 1  (that is, the respective bags B). Incidentally, the holding member  22  illustrated in  FIG. 16  includes a first holding member  22   a  and a second holding member  22   b  that extends upward in the vertical direction from the first holding member  22   a . The first holding member  22   a  is a base portion fixed on the bag accommodating unit  21 , and supports the placed bag bundle B 1  from below. The second holding member  22   b  supports a vertically upper portion of the bag bundle B 1  placed on the holding member  22 . However, the second holding member  22   b  does not contact an uppermost portion of the bag bundle B 1  placed on the holding member  22  (that is, a range near the top side St) to expose the uppermost portion. 
     According to the present modification, it is possible to completely expose a place adjacent to the top side St of each of the bag bundles B 1  in the state where each of the bag bundles B 1  is supported by the holding member  22 . Then, the taking-out unit  31  takes the bag bundle B 1  out of the bag accommodating unit  21  while holding the exposed part of the bag bundle B 1  supported by the holding member  22 . Therefore, the taking-out unit  31  can easily and reliably hold the place adjacent to the top side St of each of the bag bundles B 1 . 
     Further, the bag bundle B 1  (that is, the respective bags B) is placed so as to be slidable along a supporting surface of the holding member  22  in the state of being placed on the corresponding holding member  22 , and thus, is arranged in the state of being accurately positioned on the corresponding holding member  22  under the influence of gravity. In particular, when the supporting surface of the holding member  22  is inclined with respect to the vertical direction or the supporting surface of the holding member  22  has a planar shape, it is possible to effectively promote such sliding movement of the bag bundle B 1  caused by the influence of gravity. Incidentally, the supporting surface of the holding member  22  preferably has a shape corresponding to a shape of a contact place (the front surface or the back surface in the present modification) of the bag bundle B 1  (that is, the respective bags B), and is a planar shape in many cases, but does not necessarily coincide with the shape of the contact place of the bag bundle B 1 . 
     Incidentally, each of the bag bundles B 1  is arranged to protrude with respect to the direction Ds directed from the accommodating position Pa of the bag accommodating unit  21  toward the withdrawing position Pb on the corresponding holding member  22  in  FIG. 16 , but may be arranged to protrude in another direction. 
     [Fourth Modification] 
       FIG. 17  is a side view illustrating a bag stocker  11  and a wagon lock device  150  according to a fourth modification, which illustrates a non-locked state.  FIG. 18  is a side view illustrating a bag stocker  11  and a wagon lock device  150  according to a fourth modification, illustrating a locked state.  FIG. 19  is a plan view of the bag stocker  11  and the wagon lock device  150  according to the fourth modification, which illustrates the non-locked state.  FIG. 20  is a plan view of the bag stocker  11  and the wagon lock device  150  according to the fourth modification, which illustrates the locked state. Incidentally, in order to facilitate the understanding,  FIGS. 17 to 19  illustrate some of internal configurations in a perspective manner in some cases, and there may be elements which are not illustrated. 
     It is preferable that the bag stocker  11  arranged at a taking-out position P 1  (see  FIG. 3 ) be accurately arranged at a predetermined position and fixed at the predetermined position such that a bag bundle B 1  is smoothly and reliably taken out by a taking-out unit  31 . An allowable deviation amount from the predetermined position of the bag stocker  11  arranged at the taking-out position P 1  also varies depending on the capability of the taking-out unit  31 , but is often about less than 1 cm (more preferably about 5 mm) in practice. Therefore, it is preferable that the bag stocker  11  be fixed at the taking-out position P 1  (predetermined position). 
     In the present modification, the entire bag stocker  11  is fixed at the predetermined position while lifting the bag stocker  11  by the wagon lock device  150 . 
     The illustrated bag stocker  11  includes: a wagon frame  112  on which a body portion  20  is placed; 
     a handle  110  which extends upward from the wagon frame  112  and is operated by a worker W; and a wagon-side stopper  111  provided at a distal end of the wagon frame  112 . 
     The wagon lock device  150  includes: a first lever  151  provided on the front side; a second lever  152  provided on the rear side; a first bearing  153  rotatably attached to a distal end portion of the first lever  151 ; a second bearing  154  rotatably attached to a distal end portion of the second lever  152 ; a lock frame  160  rotatably supporting the first lever  151  and the second lever  152 ; a lock-device-side stopper  155  attached to the lock frame  160 ; and a leg portion  161  supporting the lock frame  160  on a ground G. 
     As illustrated in  FIGS. 19 and 20 , the wagon frame  112  of the bag stocker  11  is pushed and moved by the worker W via the handle  110 , is guided by a side guide  162  attached to the lock frame  160  of the wagon lock device  150 , and is stopped at a locking position illustrated in  FIG. 20 . In this locking position, a regulation pin  175 , which is fixed to the lock frame  160  and extends upward, is engaged with a guide engagement groove  113  formed in a bottom wall of the body portion  20 . Further, when the bag stocker  11  is placed at the locking position, the wagon-side stopper  111  and the lock-device-side stopper  155  abut on each other. As a result, the bag stocker  11  is regulated with respect to the wagon lock device  150  regarding an X direction and a Y direction (that is, the horizontal direction) illustrated in  FIGS. 19 and 20 . 
     Further, when the bag stocker  11  is placed at the locking position, an air cylinder  156  attached to the lock frame  160  is driven via an air cylinder holding portion  159 , an air cylinder shaft  157  extends, and a third lever  170  is rotated about a driving rotary shaft  171  while being pushed in the X direction (the left direction in  FIGS. 19 and 20 ). Along with the rotation of the third lever  170 , the air cylinder  156  rotates about an air cylinder rotary shaft  158 . The air cylinder rotary shaft  158  is rotatably attached to the air cylinder shaft  157 . As a result, the driving rotary shaft  171  fixed to the third lever  170  is axially rotated. Therefore, a fourth lever  172  and the first lever  151  fixed to the driving rotary shaft  171  rotate about the driving rotary shaft  171 , and distal end portions of the fourth lever  172  and the first lever  151  ascend. As a result, the first bearing  153  lifts the wagon frame  112  as illustrated in  FIG. 18 . At this time, the wagon-side stopper  111  is sandwiched between the first bearing  153  and the lock-device-side stopper  155 , and the bag stocker  11  is fixed to the wagon lock device  150  regarding the X direction (the left-right direction in  FIG. 18 ). Further, the wagon-side stopper  111  is fixed to the wagon lock device  150  by providing the “structure in which the wagon-side stopper  111  is sandwiched between the first bearing  153  and the lock-device-side stopper  155 ” at a plurality of places (two places in the illustrated example) in the horizontal direction (Y direction). 
     As described above, when the fourth lever  172  axially rotates about the driving rotary shaft  171  and moves in the X direction (the left direction in  FIGS. 19 and 20 ), a connecting shaft  173  rotatably connected to the driving rotary shaft  171  also moves in the same direction, and a fifth lever  174  rotatably connected to the connecting shaft  173  also rotates about a driven rotary shaft  177  while moving in the same direction. As a result, the second lever  152  fixed to the driven rotary shaft  177  axially rotates about the driven rotary shaft  177 , and the second bearing  154  ascends. As a result, the second bearing  154  lifts the wagon frame  112  as illustrated in  FIG. 18 . 
     As described above, according to the present modification, the bag stocker  11  is arranged at the locking position (see  FIG. 20 ) to operate the air cylinder  156 , so that it is possible to accurately and reliably fix the bag stocker  11  to the wagon lock device  150  at a predetermined position by the engagement between the guide engagement groove  113  and the regulation pin  175 , lifting of the bag stocker  11  by the first bearing  153  and the second bearing  154  (particularly, lifting of a caster  23  from the ground G), and the sandwiching of the wagon-side stopper  111  between the first bearing  153  and the lock-device-side stopper  155 . 
     Further, when the various levers and rotary shafts are combined as in the present modification, it is possible to drive both a front mechanism (that is, the first lever  151  and the first bearing  153 ) and a rear mechanism (that is, the second lever  152  and the second bearing  154 ) using a single drive unit (that is, the air cylinder  156 ). 
     [Fifth Modification] 
       FIG. 21  is a side view illustrating a bag stocker  11  according to a fifth modification, which illustrates a configuration inside the bag stocker  11 . 
     A mechanism that causes the bag accommodating unit  21  to slide with respect to a body portion  20  is not limited, but is desirably a mechanism that can lock the bag accommodating unit  21  to the body portion  20  at least one (preferably both) of an accommodating position Pa and a withdrawing position Pb. In the present modification, an example of such a lock mechanism of the bag accommodating unit  21  will be described. 
       FIG. 21  illustrates the bag stocker  11  in which three bag accommodating units  21 A,  21 B, and  21 C are arrayed in the vertical direction as an example. The uppermost bag accommodating unit  21 A illustrated in  FIG. 21  is unlocked at the accommodating position Pa and is in the state of being movable from the accommodating position Pa to the withdrawing position Pb. The middle bag accommodating unit  21 B is in the locked state at the withdrawing position Pb. The lowermost bag accommodating unit  21 C is in the locked state at the accommodating position Pa. 
     Each of the bag accommodating units  21  includes moving plates  215  provided on both sides. A stretchable slide rail  250  is attached to the body portion  20 , and the moving plate  215  is attached to the slide rail  250 . The illustrated slide rail  250  includes: a first slide rail  250 A attached to the body portion  20 ; a second slide rail  250 B provided slidably with respect to the first slide rail  250 A at the inner side of the first slide rail  250 A; and a third slide rail  250 C provided slidably with respect to the second slide rail  250 B at the inner side of the second slide rail  250 B. The moving plate  215  is attached to the third slide rail  250 C. When the bag accommodating unit  21  is arranged at the accommodating position Pa, the first slide rail  250 A to the third slide rail  250 C overlap each other, and the slide rail  250  is in a contracted state. On the other hand, when the bag accommodating unit  21  is arranged at the withdrawing position Pb, the first slide rail  250 A to the third slide rail  250 C are arranged at positions shifted from each other in the sliding direction, and the slide rail  250  is in a stretched state. 
     Incidentally, a stopper  222  attached to the body portion  20  contacts the bag accommodating unit  21  arranged at the accommodating position Pa so that further movement (movement to the left side in  FIG. 21 ) of the bag accommodating unit  21  from the accommodating position Pa is prevented. Further, when the bag accommodating unit  21  is arranged at the withdrawing position Pb, a stopper  264  attached to the body portion  20  contacts the moving plate  215  so that further movement (movement to the right side in  FIG. 21 ) of the bag accommodating unit  21  from the withdrawing position Pb is prevented. 
     An accommodating portion handle  210  is provided to be rotatable about a handle rotary shaft  211 , and both end portions of the handle rotary shaft  211  are rotatably attached to the moving plates  215 , respectively. A handle lever  212  is attached to the handle rotary shaft  211 , and the handle lever  212  rotates in accordance with a shaft rotation of the handle rotary shaft  211 . 
     Each of the moving plates  215  is provided with a supporting block  214  and a supporting block  216 , and a lock movement shaft  213  extending in the sliding direction of the bag accommodating unit  21  is supported by the supporting block  214  and the supporting block  216  so as to be movable in the sliding direction. One end portion of the lock movement shaft  213  abuts on the handle lever  212 , and the other end portion thereof abuts on the lock lever  220 . 
     The lock lever  220  is attached to the moving plate  215  via a tension spring  217 , and an elastic force of the tension spring  217  acts on the lock lever  220 . Further, the lock lever  220  is rotatably attached to the moving plate  215  via a lock rotary shaft  221 , and rotates about the lock rotary shaft  221 . A first lock groove  224  and a second lock groove  226  are formed in the lock lever  220 . 
     The bag stocker  11  includes a first stopper shaft  231 , a second stopper shaft  233 , a third stopper shaft  235 , and a fourth stopper shaft  237 . The first stopper shaft  231  is attached to the moving plate  215 , the second stopper shaft  233  is attached to the body portion  20 , the third stopper shaft  235  is attached to the moving plate  215 , and the fourth stopper shaft  237  is attached to the body portion  20 . The first stopper shaft  231  and the fourth stopper shaft  237  are provided in order to lock the bag accommodating unit  21 , and the second stopper shaft  233  and the third stopper shaft  235  are provided in order to regulate an attitude (that is, an inclination) of the lock lever  220 . 
     As the fourth stopper shaft  237  is engaged with the second lock groove  226  in the state where the bag accommodating unit  21  is arranged at the accommodating position Pa, the bag accommodating unit  21  is locked at the accommodating position Pa (see the “bag accommodating unit  21 C” in  FIG. 21 ). On the other hand, as the first stopper shaft  231  is engaged with the first lock groove  224  in the state where the bag accommodating unit  21  is arranged at the withdrawing position Pb, the bag accommodating unit  21  is locked at the withdrawing position Pb (see the “bag accommodating unit  21 B” in  FIG. 21 ). When the bag accommodating unit  21  is in the locked state, the handle lever  212  is not inclined or almost not inclined via the accommodating portion handle  210 , and the tension spring  217  is relatively contracted, and the lock lever  220  takes a first attitude. On the other hand, as the handle lever  212  is inclined via the accommodating portion handle  210 , the lock movement shaft  213  is pushed by the handle lever  212 , the lock movement shaft  213  pushes the lock lever  220 , the tension spring  217  is relatively stretched, and the lock lever  220  takes a second attitude. In this manner, the worker W can rotate the lock lever  220  about the lock rotary shaft  221  to be placed in the first attitude and the second attitude by operating the accommodating portion handle  210 , and can perform a slide lock of each of the bag accommodating units  21  and release the lock thereof. 
     Incidentally, the lock lever  220  has a first inclined surface  261  guiding the first stopper shaft  231  to the first lock groove  224  and a second inclined surface  262  guiding the fourth stopper shaft  237  to the second lock groove  226 . When the bag accommodating unit  21  is moved from the accommodating position Pa to the withdrawing position Pb, the first stopper shaft  231  contacts the first inclined surface  261  of the lock lever  220  placed in the first attitude. Thereafter, the first stopper shaft  231  slides on the first inclined surface  261  and gradually rotates the lock lever  220  about the lock rotary shaft  221 , and is finally engaged with the first lock groove  224  at the withdrawing position Pb. Similarly, when the bag accommodating unit  21  is moved from the withdrawing position Pb to the accommodating position Pa, the fourth stopper shaft  237  contacts the second inclined surface  262  of the lock lever  220  placed in the first attitude. Thereafter, the fourth stopper shaft  237  slides on the second inclined surface  262  and gradually rotates the lock lever  220  about the lock rotary shaft  221 , and is finally engaged with the second lock groove  226  at the accommodating position Pa. 
     In this manner, each of the bag accommodating units  21  can be slidably provided with respect to the body portion  20 , and each of the bag accommodating units  21  can be provided so as to be lockable at the accommodating position Pa and the withdrawing position Pb according to the bag stocker  11  of the present modification. 
     [Other Modifications] 
     In the above embodiments and modifications, the specific number of each of elements is not limited. In particular, only one of each of the elements provided in the depositing unit  33  or on the downstream side of the depositing unit  33  may be provided, or a plurality of the elements may be provided. 
     Further, the plurality of bag accommodating units  21  are provided in each of the bag stockers  11 , and the plurality of holding members  22  are provided in each of the bag accommodating units  21  in the above-described embodiments and modifications, but the invention is not limited thereto. That is, only the single bag accommodating unit  21  may be provided in each of the bag stockers  11 , or only the single holding member  22  may be provided in each of the bag accommodating units  21 . 
     Aspects including components and/or methods other than the above-described components and/or methods may also be included in embodiments of the present invention. Further, aspects in which some of the above-described components and/or methods are not included may also be included in embodiments of the present invention. Further, aspects including some components and/or methods included in an embodiment of the present invention and some components and/or methods included in another embodiment of the present invention may also be included in embodiments of the present invention. Therefore, components and/or methods included in each of the above-described embodiments and modifications and embodiments of the present invention other than those described above may be combined, and aspects according to such combinations may also be included in embodiments of the present invention. Further, the effects exerted by the present invention are not limited to the above-described effects, and specific effects according to the specific configuration of each embodiment can be exerted. In this manner, various additions, modifications, and partial deletions can be made to the respective elements described in the claims, the specification, the abstract, and the drawings without departing from a technical idea and a gist of the present invention.