JP4967318B2 - Stocker - Google Patents

Description

  The present invention relates to a stocker for temporarily storing a front opening unified pod (FOUP), a cassette, and the like waiting for a process in a manufacturing process of a liquid crystal display device or a semiconductor device.

  As this type of stocker, there is one disclosed in Patent Document 1. This configuration is shown in FIG. 9 of the present application, and the stocker 10 includes a shelf 12, a stacker crane 27, a port 14, an outer wall 15 and the like as main components. The stacker crane 27 includes a transfer robot 20, a pair of support columns 25, a pair of table elevating means 26, a set of wheels 29, and a pair of rails 28 as main components. The transfer robot 20 includes a base 21, a turning table 22, an arm 23, and a gripper 24. The shelves 12 are arranged on both sides of the stacker crane 27 so that cassettes 11 in which glass substrates for liquid crystal display devices, silicon substrates for semiconductor devices and the like are stored can be placed and stored.

In this configuration, the cassette 11 is carried into the stocker 10 as follows. That is, a transport carriage (not shown) arrives at the port 14 with the cassette 11 mounted thereon, and the cassette 11 is placed on the port 14 using transfer means equipped on the transport carriage. Next, the cassette 11 mounted on the port 14 is mounted on the transfer robot 20 mounted on the stacker crane 27, transported to a shelf position designated by a system controller (not shown), and placed on the shelf 12. Is done. Moreover, carrying out of the cassette 11 from the stocker 10 (operation of taking out the cassette 11 from the shelf 12 and transferring it to the transport carriage) is performed in the reverse order of the above.
JP 2005-277326 A

Patent document 2 discloses a stocker having another configuration. In this patent document 2, a pair of ports provided on both sides of a stacker installed inside the stocker is made the same structure as the stocker internal shelf. Containers are loaded and unloaded on a belt conveyor, one stacker robot installed in the stocker loads and unloads cassettes on the shelf of the containers, and the cassettes loaded and unloaded from these containers are placed on both sides of the stacker robot. It is configured to be carried in and out of the stocker side.
JP 2003-163250 A

  However, in the stockers of Patent Documents 1 and 2, the stacker robot is configured to carry cassettes in and out of the shelves arranged on both sides of the stacker crane, and therefore must have at least a 180 ° rotation function (see FIG. In the configuration of 9, the turning table 22). For example, when the object to be conveyed is a glass substrate for a liquid crystal display device, the cassette weight of the object to be conveyed is several hundred kilometers or more, and a large driving torque is required for turning the robot. Therefore, the drive source for realizing this has become larger and heavier, which has become an obstacle to making the stacker crane compact and lightweight.

  In addition, as the equipment becomes larger and heavier, the working speed of the equipment tends to slow down. To avoid this, it is necessary to increase the driving force further, and the drive source becomes larger and heavier. Fall into. Therefore, a reduction in the operating efficiency of the apparatus is inevitable when the apparatus is enlarged due to the extension of the prior art.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is to avoid an increase in the size and weight of the stacker crane and to increase the transfer speed when transporting a cassette such as a large liquid crystal substrate. It is to provide a stocker with high work efficiency.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

According to a first aspect of the present invention, a stocker configured as follows is provided. That is, in a stocker including a storage shelf that can store a plurality of articles to be conveyed in a vertical direction and a horizontal direction, a rail laid in parallel to the storage shelf, a stacker crane that can run on the rail, and a port frame And a plurality of rollers disposed on the port frame so as to be drivable, and disposed at positions facing the storage shelves with the rails interposed therebetween, and a conveyor for loading and unloading the object to / from the stocker. The stacker crane includes a table that can be moved up and down in a vertical direction, and is placed on the table or on the same side as the storage shelf so that the object to be conveyed enters the stocker. a transfer means and a movable back and forth linear slide fork opposite the inline port for unloading, the upper open type disposed in the lower part of the stacker crane And the conveyor frame, said plurality of rollers which are rotatably supported on the conveyor frame, with a provided fixed so that the height of the upper surface of the rollers is matched to the height of the upper surface of the conveyor port And a roller conveyor for transferring the material to be transferred from the transfer means to the conveyor port .

  In this way, by adopting a linear slide fork in the transfer means of the stacker crane and omitting the turning function, it can be reduced in size and weight, can be operated lightly, and the time required for loading and unloading work Can be shortened. Even when the port is arranged on the opposite side to the storage shelf, the object to be conveyed can be delivered by the roller conveyor and the port. Therefore, substantially the same effect as the transfer means having a turning function as shown in Patent Document 1 can be exhibited.

In the stocker, the conveyor frame of the roller conveyor includes a gap portion formed to receive the table on a side wall portion, and a space formed to accommodate the linear slide fork between the side wall portions. And having a shape that does not interfere with the table and the linear slide fork of the transfer means, and the transfer means has a transfer object placing surface of the linear slide fork as a roller of the roller conveyor. It is preferable to be configured to be able to be lowered to a position lower than the upper surface.

  With this configuration, it is possible to transfer the object to be conveyed to the roller conveyor by simply lowering the transfer means, and thus a simpler configuration can be realized. In addition, the object to be conveyed can be quickly relayed from the transfer means to the roller conveyor, and the time required for loading and unloading the object to be conveyed can be further shortened.

According to a second aspect of the present invention, a stocker configured as follows is provided. That is, in a stocker provided with a storage shelf that can store a plurality of articles to be conveyed in a vertical direction and a horizontal direction, the stocker is laid so as to constitute a plurality of traveling paths that are parallel to and adjacent to the storage shelf. A rail, a plurality of stacker cranes that can travel independently of each other of the plurality of travel paths, a port frame, and a plurality of rollers that are drivably driven on the port frame, and sandwich the rail disposed in the storage shelves and the counter position, the and the conveyor port for entry and leaving the transferred object to the stocker, wherein the storage shelves are disposed on opposite sides of said plurality of traveling routes, the stacker crane each, stopper and vertically movable table in a vertical direction, is placed on the table are disposed on the same side as the storage shelf or-holding pipe rack the transported object A transfer means and a facing inline port retractably linear slide fork for goods movements to the conveyor frame of the installed upwardly open shape at the bottom of the stacker crane, rotatably on the conveyor frame A plurality of rollers supported by the roller, and fixedly provided so that the height of the upper surface of the rollers coincides with the height of the upper surface of the conveyor port , and the object to be conveyed is transferred from the transfer means. inherited by and a roller conveyor for transfer to the conveyor ports, one and arranged facing linear slide fork stacker crane traveling on the travel route, linear slide fork stacker crane traveling on the travel path adjacent thereto A stocker characterized in that the disposition direction is opposite.

  Even in this configuration, by adopting a linear slide fork in the transfer means of the stacker crane and omitting the turning function, it is possible to reduce the size and weight, and to operate lightly, and to enter and exit the warehouse. Can be shortened. Further, even when the port is arranged on the side opposite to the storage shelf, the object to be conveyed can be easily delivered by the roller conveyor and the port. Furthermore, it is possible to provide a stocker having a high capacity, a short time required for loading and unloading, and a low equipment cost.

In the stocker, the conveyor frame of the roller conveyor includes a gap portion formed to receive the table on a side wall portion, and a space formed to accommodate the linear slide fork between the side wall portions. And having a shape that does not interfere with the table and the linear slide fork of the transfer means, and the transfer means has a transfer object placing surface of the linear slide fork as a roller of the roller conveyor. It is preferable to be configured to be able to be lowered to a position lower than the upper surface.

  With this configuration, it is possible to transfer the object to be conveyed to the roller conveyor by simply lowering the transfer means, and thus a simpler configuration can be realized. In addition, the object to be conveyed can be quickly relayed from the transfer means to the roller conveyor, and the time required for loading and unloading the object to be conveyed can be further shortened.

  Next, embodiments of the invention will be described. FIG. 1 is an upper perspective view showing an overall configuration of a stocker according to an embodiment of the present invention, and FIG. 2 is a side sectional view of an essential part showing the operation of a roller conveyor of a stacker crane.

  In FIG. 1, the stocker 6 of the present embodiment includes a shelf main body 7 of a storage shelf, a stacker crane 5, a conveyor port (port) 17, and a rail 28 as main components. The shelf body 7 is disposed on one side of the rail 28, and the conveyor port 17 is disposed at an opposing position with the shelf body 7 and the rail 28 interposed therebetween.

  The shelf body 7 includes a shelf 12 provided with a notch 38 and a stocker outer wall 15, and can store a plurality of cassettes (conveyed objects) 35 in a vertical direction and a horizontal direction.

  Two rails 28 are laid in parallel with the shelf body 7, and one stacker crane 5 is configured to run on the rail 28. The stacker crane 5 includes transfer means 36, a conveyor table (roller conveyor) 34, a support column 37, and wheels 29 as main components.

  The conveyor port 17 is used for loading and unloading the cassette 35 with respect to the stocker 6 and includes a port frame 13 and a roller 16. A plurality of rollers 16 are arranged at appropriate intervals, and can be driven by a motor (not shown).

  The transfer means 36 includes an elevating frame (table) 32, a linear slide fork 33, and a table elevating means 26. The elevating frame 32 is configured to be vertically movable by the table elevating means 26. The linear slide fork 33 is installed on the elevating frame 32, is extended so as to protrude with respect to the storage shelf (shelf body 7), and is configured to be retractable. Since the linear slide fork 33 is installed on the lifting frame 32 so as not to turn, the linear slide fork 33 cannot be moved away from the shelf body 7. A mounting surface on which the cassette 35 can be mounted is formed on the upper surface of the tip of the linear slide fork 33.

  The conveyor table 34 is used to transfer the cassette 35 from the transfer means 36 to the conveyor port 17, and has a conveyor frame 31 that is open at the top of the stacker crane 5. And a plurality of rollers 30 rotatably supported on the conveyor frame 31. The roller 30 is provided such that the height of the upper surface thereof coincides with the height of the upper surface of the roller 16 of the conveyor port 17. The roller 30 can be driven by a motor (not shown), and the cassette 35 placed on the roller 30 is moved in a direction along the expansion and contraction of the linear slide fork 33 (more specifically, the retraction direction of the linear slide fork 33). It can be transported.

  The conveyor table 34 has a shape that does not interfere with the lifting frame 32 and the linear slide fork 33. In other words, a side wall portion of the conveyor frame 31 of the conveyor table 34 is formed with a gap portion that can receive the elevating frame 32 configured in a frame shape, and the linear slide fork 33 can be accommodated between the side wall portions. A space is formed.

  Next, the function of the conveyor table 34 in the stacker crane 5 will be described with reference to FIGS. 3 to 6, A) is a front view, and B) is a side sectional view.

  FIG. 3 shows a situation in which the cassette 35 is taken out from the shelf 12 and the linear slide fork 33 is about to be degenerated. When the linear slide fork 33 completes the retraction, the cassette 35 and the linear slide fork 33 are positioned directly above the lifting frame 32 as shown in FIG. Next, the stacker crane 5 operates the table elevating means 26 to lower the elevating frame 32. Since the elevating frame 32 and the linear slide fork 33 are configured not to interfere with the conveyor table 34 as described above, the elevating frame 32 passes through the conveyor table 34 from the top to the bottom, and the lower part of the conveyor table 34 (strictly speaking, For example, it can enter and descend to the inside of the conveyor frame 31).

  When the linear slide fork 33 enters and descends to the lower part of the conveyor table 34 with the cassette 35 mounted, the cassette 35 is scooped by the roller 30 of the conveyor table 34 and remains on the roller 30 as shown in FIG. Next, the conveyor table 34 rotationally drives the rollers 30 supported by the conveyor frame 31, and transports the cassette 35 to the conveyor port 17 facing the conveyor table 34 while being adjacent to the conveyor table 34 (FIGS. 6 and 2). When the cassette 35 is transferred out of the lifting / lowering operation area of the conveyor table 34, the conveyor table 34 can be raised and lowered.

  The stocker 6 shown in a plan view in FIG. 7 has basically the same configuration as that in FIG. 1, but a plurality of (three) stacker cranes 5 are installed on a common rail 28, and three other than the conveyor port 17 are installed. 1 in that the two inline ports 18 are provided adjacent to the shelf body 7. The inline port 18 is a port used when the liquid crystal manufacturing apparatus 8 directly enters and leaves the cassette 35 with respect to the stocker 6.

  The inline port 18 is provided on the same side as the shelf body 7, and the cassette 35 is transferred to and from the stacker crane 5 by the linear slide fork 33 of the transfer means 36. For example, if the notch 38 is provided in the inline port 18 in the same manner as the shelf 12, the cassette 35 can be delivered between the linear slide fork 33 and the inline port 18. Note that the inline port 18 of the liquid crystal manufacturing apparatus 8 is a port for connecting the stocker 6 and the liquid crystal manufacturing apparatus 8 and can be directly connected by a roller conveyor or connected via a transport robot.

  Next, the operation of loading and unloading cassettes 35 into the shelf 12 in the stocker 6 shown in FIGS. 1 and 7 will be described.

  The warehousing operation will be described. First, a cassette 35 that has been transported by an unillustrated unmanned transport cart or other transport means such as a lifter is placed on the conveyor port 17 shown in FIG. Then, the stacker crane 5 travels to the position facing the conveyor port 17 and stops, and the lifting frame 32 is lowered to the lower limit of the lifting range. At this time, as shown in FIG. 2, the height of the upper surface of the roller 16 of the conveyor port 17 and the height of the upper surface of the roller 30 of the conveyor table 34 are substantially the same.

  Subsequently, the roller 16 of the conveyor port 17 and the roller 30 of the conveyor table 34 of the stacker crane 5 are driven, and the cassette 35 placed on the conveyor port 17 is transferred onto the conveyor table 34 of the stacker crane 5. Completion of the transfer is detected by a sensor (not shown) attached to the conveyor table 34, and the cassette 35 is accurately positioned on the conveyor table 34 by this sensor.

  Next, the stacker crane 5 raises the elevating frame 32 from the lower limit position. At this time, the cassette 35 placed on the conveyor table 34 is scooped by the linear slide fork 33 that rises integrally with the elevating frame 32. Thereafter, the stacker crane 5 moves horizontally on the rail 28 along the shelf 12, raises the lifting frame 32, and stops with the transfer means 36 facing the intended shelf position.

  After stopping the stacker crane 5, the transfer means 36 extends the fork to the placement position of the shelf 12 while positioning the cassette 35 on the linear slide fork 33, and aligns the tip of the fork (that is, the cassette 35). . Next, when the elevating frame 32 is lowered by a small amount, the front end of the fork passes through the notch 38 and the top surface of the front end of the fork becomes lower than the shelf surface. At the same time, the cassette 35 is scooped by the shelf 12. It remains on the shelf 12. Thus, the storage of the cassette 35 in the stocker 6 is completed, and thereafter, the stacker crane 5 retracts the fork of the linear slide fork 33 and moves to the next operation.

  Next, the unloading operation will be described. This unloading operation is performed in the completely reverse procedure of the above-described loading operation. First, the stacker crane 5 moves the transfer means 36 to the shelf position where the target cassette 35 is accommodated, advances the linear slide fork 33, and then the tip of the linear slide fork 33 moves down the notch 38. The raising / lowering frame 32 is slightly lifted so as to pass upward, and the cassette 35 is scooped up on the mounting surface (FIG. 3). Then, the linear slide fork 33 is retracted as shown in FIG. 4 and the cassette 35 is drawn into the stacker crane 5 to travel to the conveyor port 17 position.

  While traveling to the conveyor port 17, the stacker crane 5 lowers the lifting frame 32. After reaching the conveyor port 17, the stacker crane 5 further lowers the lifting frame 32 to below the conveyor table 34 to transfer the cassette 35 to the conveyor port 17. (FIG. 5). Next, the rollers 30 and 16 of the conveyor table 34 and the conveyor port 17 are driven, and the cassette 35 is transferred from the conveyor table 34 to the conveyor port (FIG. 6). The cassette 35 placed on the conveyor port 17 is transferred to a transport cart or the like and carried out to the outside.

  Note that a series of these transfer and transfer operations are performed based on command signals from control devices such as MCS that controls production management and MES that comprehensively manages the transfer system. Further, the controller of the stocker 6 can issue a similar command signal when offline.

  As described above, the stocker 6 of the present embodiment includes the shelf body 7 that can store a plurality of cassettes 35 arranged in the vertical direction and the horizontal direction, the rail 28 laid in parallel to the shelf body 7, A stacker crane 5 capable of traveling on the rail 28 and a conveyor port 17 for loading and unloading the cassette 35 with respect to the stocker 6 are provided. The stacker crane 5 includes a transfer means 36 that includes a lifting frame 32 that can be vertically moved up and down, and a linear slide fork 33 that is installed on the lifting frame 32 and can be moved back and forth facing the shelf body 7. A conveyor table 34 that can transfer the cassette 35 from the transfer means 36 to the conveyor port 17.

  As described above, by adopting the linear slide fork 33 in the transfer means 36 of the stacker crane 5 and omitting the turning function, it can be reduced in size and weight, and can be operated easily. The time for shipping work can be reduced. This effect is particularly remarkable when the cassette 35 is heavy. Further, even when the conveyor port 17 is disposed on the opposite side of the shelf body 7 as shown in FIGS. 1 and 7, the cassette 35 can be delivered by the conveyor table 34 and the conveyor port 17. Therefore, substantially the same effect as the transfer means having a turning function as shown in Patent Document 1 can be exhibited.

  In the stocker 6, the transfer means 36 of the stacker crane 5 can lower the top surface (cassette mounting surface) of the linear slide fork 33 to a position lower than the top surface of the roller 30 of the conveyor table 34. It is configured.

  Thereby, since the cassette 35 can be inherited to the conveyor table 34 by simply lowering the elevating frame 32, a simpler configuration can be realized. In addition, the cassette 35 can be quickly relayed from the transfer means 36 to the conveyor table 34, and the time required for unloading the cassette 35 can be further shortened. In addition, since the cassette 35 can be transferred from the conveyor table 34 to the transfer means 36 only by raising the elevating frame 32 from the lower limit position at the time of warehousing, of course, the time required for warehousing is shortened.

  FIG. 8 shows a modified example, and this stocker 6 has a configuration in which two stockers in FIG. 7 are arranged to face each other. In the stocker 6 of FIG. 8, two pairs of rails 28 are laid so as to constitute a plurality of parallel and adjacent traveling paths on which the stacker crane 5 can travel independently of each other. And the shelf main body 7 of the storage shelf is disposed on both sides so as to sandwich the two pairs of rails 28. The conveyor port 17 is used, for example, to transfer the cassette 35 from the shelf body 7 on one side to the shelf body 7 on the other side.

  In the stacker crane 5 traveling on the upper rail 28 in FIG. 8, the linear slide fork 33 of the transfer means 36 is installed so as to be able to advance with respect to the upper shelf body 7 in the figure, and the lower rail The linear slide fork 33 of the stacker crane 5 traveling 28 is installed so as to be able to advance with respect to the lower shelf body 7 in the figure. In short, the arrangement direction of the linear slide fork 33 of the stacker crane 5 is reversed between the upper side and the lower side in the figure. Thereby, the cassette 35 can be easily delivered to the shelf main body 7 disposed on both sides of the rail 28.

  As described above, in the stocker 6 having the configuration shown in FIG. 8, the rails 28 are laid so as to form a plurality of parallel and adjacent traveling paths, and the plurality of stacker cranes 5 are independent of each other along the respective traveling paths. It is possible to run. The shelf body 7 is disposed on both sides of the plurality of travel routes, and travels along the travel direction adjacent to the arrangement direction of the linear slide fork 33 of the stacker crane 5 traveling on the one travel route. The arrangement direction of the linear slide fork 33 of the stacker crane 5 is opposite.

  By configuring in this way, it is possible to achieve substantially the same effect as the configuration of FIGS. 1 and 7 and to easily improve the accommodation capacity. The configuration of FIG. 8 is functionally similar to the conventional configuration of FIG. 9, but according to the knowledge of the inventor, the configuration of FIG. It has been confirmed that both the time required and the equipment cost are excellent.

  The preferred embodiment and the modification of the present invention have been described above, but the above configuration is an example, and can be modified as follows, for example.

  The conveyor port 17 can be disposed not on the side opposite to the shelf body 7 but on the same side as the shelf body 7. In addition, the conveyor port 17 is not limited to the case of serving as a loading / unloading, and can be arranged separately for a port dedicated for loading and a port dedicated for loading / unloading. Further, the above-mentioned FOUP or the like can be adopted as the conveyed object instead of the cassette 35.

  The elevating frame 32 and the conveyor table 34 are not limited to the shapes shown in FIG. However, it is advantageous as described above that the transfer means 36 and the conveyor table 34 are formed in a shape that does not interfere with each other so that the transfer means 36 can be lowered below the upper surface of the roller 30 of the conveyor table 34.

The upper perspective view which shows the whole structure of the stocker which concerns on one Embodiment of this invention. The principal part side surface sectional view which shows operation | movement description of the roller conveyor part of a stacker crane. It is explanatory drawing which shows a mode that a cassette is scooped up and pulled in with a linear slide fork, A) is a front view, B) is side sectional drawing. It is explanatory drawing which shows a mode that the cassette drawn in to the stacker crane is lowered | hung, Comprising: A) is a front view, B) is side sectional drawing. It is explanatory drawing which shows a mode that the cassette was succeeded to the roller conveyor from the transfer means, Comprising: A) is a front view, B) is side sectional drawing. It is explanatory drawing which shows a mode that a cassette is delivered from a roller conveyor to a conveyor port, Comprising: A) is a front view, B) is side sectional drawing. The top view which shows the stocker of another structure. The top view which shows the further modification of the stocker of FIG. The upper perspective view which shows the conventional structure of a stocker.

Explanation of symbols

5 Stacker crane 6 Stocker 7 Shelf body (storage shelf)
17 Conveyor port (port)
18 Inline port (port)
28 Rail 32 Lift frame (table)
33 Linear slide fork 34 Conveyor table (roller conveyor)
36 Transfer means

Claims (4)

In a stocker equipped with a storage shelf that can store a plurality of objects to be conveyed in a vertical and horizontal direction,
Rails laid parallel to the storage shelf;
A stacker crane capable of traveling on the rail;
A port frame and a plurality of rollers disposed on the port frame so as to be drivable, and disposed at a position facing the storage shelf with the rail interposed therebetween, for loading and unloading the object to / from the stocker. The conveyor port of
With
The stacker crane is
A table that can be moved up and down in a vertical direction, and is placed on the same table as the storage shelf or on the same side as the storage shelf, and moves forward and backward against an inline port for loading and unloading the object to / from the stocker. A transfer means comprising a free linear slide fork;
A conveyor frame having an open top shape installed at a lower portion of the stacker crane, and a plurality of rollers rotatably supported by the conveyor frame, wherein the height of the upper surface of the roller is the height of the upper surface of the conveyor port. A roller conveyor that is fixedly provided so as to coincide with the transfer object and that transfers the transferred object from the transfer means to the conveyor port ;
A stocker characterized by comprising: The stocker according to claim 1,
The conveyor frame of the roller conveyor has a gap portion formed to receive the table on a side wall portion and a space formed to accommodate the linear slide fork between the side wall portions. It is configured in a shape that does not interfere with the table and the linear slide fork of the mounting means,
The stocker, wherein the transfer means is configured to be able to lower a transported object placement surface of the linear slide fork to a position lower than a roller upper surface of the roller conveyor. In a stocker equipped with a storage shelf that can store a plurality of objects to be conveyed in a vertical and horizontal direction,
Rails laid to form a plurality of travel paths that are parallel to and adjacent to the storage shelf,
A plurality of stacker cranes capable of traveling independently from each other of the plurality of travel routes;
A port frame and a plurality of rollers disposed on the port frame so as to be drivable, and disposed at a position facing the storage shelf with the rail interposed therebetween, for loading and unloading the object to / from the stocker. The conveyor port of
With
The storage shelves are arranged on both sides of the plurality of travel routes,
Each of the stacker cranes
A table that can be moved up and down in a vertical direction, and is placed on the same table as the storage shelf or on the same side as the storage shelf, and moves forward and backward against an inline port for loading and unloading the object to / from the stocker. A transfer means comprising a free linear slide fork;
A conveyor frame having an open top shape installed at a lower portion of the stacker crane, and a plurality of rollers rotatably supported by the conveyor frame, wherein the height of the upper surface of the roller is the height of the upper surface of the conveyor port. A roller conveyor that is fixedly provided so as to coincide with the transfer object and that transfers the transferred object from the transfer means to the conveyor port ;
With
The stocker characterized in that the orientation of the linear slide fork of the stacker crane traveling along the travel route is opposite to the orientation of the linear slide fork of the stacker crane traveling along the travel route adjacent thereto. . The stocker according to claim 3,
The conveyor frame of the roller conveyor has a gap portion formed to receive the table on a side wall portion and a space formed to accommodate the linear slide fork between the side wall portions. It is configured in a shape that does not interfere with the table and the linear slide fork of the mounting means,
The stocker, wherein the transfer means is configured to be able to lower a transported object placement surface of the linear slide fork to a position lower than a roller upper surface of the roller conveyor.

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