JPH10252865A - Sprocket and article housing device using thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a special sprocket, with which a part of an endless body to be wound around a sprocket can be replaced with a rope body at a low cost in the case of replacing a part of an endless body formed of a roller chain with a rope body such as a wire, and to lower the cost more by using this sprocket. SOLUTION: This device is provided with plural teeth 32 to be engaged with a roller chain 17, and a sprocket 9 provided with recessed parts 33, in which a rope body 18 is inserted for winding, in the periphery thereof is provided, and the sprocket 9 is provided in an outlet and inlet side of a housing unit for aligning plural articles for housing, and an endless body having the roller chain 17 and the rope body 18 is stretched over a rotor provided in back of the housing unit freely to be turned in the normal direction and the reverse direction, and an article can be placed on the roller chain 17 in an upper moving route of the endless body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprocket provided with a plurality of teeth on its outer periphery for engaging a roller chain.
The sprocket is provided on the entrance / exit side of the article storage unit, and an endless body having a roller chain and a string-like body such as a wire is hung between a rotating body provided on the back side of the storage unit in a forward and reverse rotation. The present invention relates to an article storage device for placing and storing a plurality of articles on the roller chain in an upper end moving path of an endless body.

[0002]

2. Description of the Related Art In an article storage apparatus as described above, a roller chain is generally used as an endless body for mounting and transporting articles, and sprockets are respectively provided at an entrance side and a back side of a storage section for storing articles. The roller chain is wound between the two sprockets, and the roller member of the roller chain is supported by the guide member. However, the roller chain hung between the two sprockets to place and convey articles only reciprocates between the entrance side and the back side of the storage unit. There is no need to construct a roller chain. In other words, only the entrance and exit sides of the storage unit are sprockets, the back side is a pulley, and a part of the endless roller chain is replaced with a string-like body such as an inexpensive wire. It is conceivable to reduce the cost of the apparatus by using only the roller chain.

[0003]

However, even if a part of the endless roller chain is replaced with a wire or the like, the sprocket around which the endless body is wound has a plurality of teeth which mesh with the roller chain on the outer periphery. If it is a conventional sprocket with only a sprocket, even the part wound around the sprocket can not be replaced with wire etc.
There is a limit in reducing the cost of the apparatus.

The present invention focuses on this point. An object of the present invention is to replace a part of an endless body consisting of a roller chain with a string such as a wire, and to use an inexpensive string even for a part wound around a sprocket. It is an object of the present invention to provide a special sprocket that can be replaced with a shape body, and to provide an article storage device that can be further reduced in cost by using the sprocket.

[0005]

According to a first aspect of the present invention, there is provided a sprocket according to the first aspect of the present invention, wherein the sprocket is provided with a concave portion into which a cord is inserted and wound around the outer periphery. It is possible to replace the parts that are not wound around the sprocket with inexpensive cords such as wires, and even replace the parts that are wound around the sprockets with cords. Can be made as short as possible to reduce the cost of the endless body wound around the sprocket.

[0006] According to the sprocket according to claim 2,
Since a plurality of teeth that mesh with the roller chain are provided over the entire outer periphery of the sprocket, it can be used even for endless bodies with a large amount of winding movement of the roller chain around the sprocket, thereby expanding the applicable range. In addition to the above, the concave portion around which the string is wound is also provided over the entire outer periphery of the sprocket, so that it can be used for an endless body having a large amount of winding movement of the string with respect to the sprocket. In addition, even in an endless body in which the amount of winding movement of the roller chain or the string-like body with respect to the sprocket is small, the teeth for the roller chain and the recesses for the string-like body are both provided over the entire circumference of the sprocket. When winding an endless body around a sprocket, it is not necessary to take the phase between the sprocket and the endless body into consideration, and the endless body can be easily assembled.

According to the sprocket according to the third aspect,
Since the indentation for the cord-like body is provided at the middle part in the tooth width direction of the tooth tips of a plurality of teeth, it is easy to provide a recess on the tooth tip of the normal tooth where the roller chain engages. With such a configuration, for example, the sprocket itself can be manufactured at low cost without complicating the entire structure of the sprocket as in the case where a separate recess is provided on the lateral side of the tooth.

[0008] According to the sprocket according to the fourth aspect,
Since the concave portion for the string is provided at the center in the width direction of the plurality of teeth, when a part of the roller chain is replaced with the string, it can be replaced with one string. Moreover, since the concave portion is provided at the center of the tooth width, the string is wound around the sprocket by connecting the string so as to be located at the center in the width direction of the roller chain. Even in this state, there is little risk that the roller chain will shift in the width direction of the sprocket, and the engagement of the roller chain with the sprocket can be performed smoothly.

[0009] According to the sprocket according to claim 5,
The lateral surface of the concave portion is formed as an inclined surface, and the lateral width of the concave portion is configured to be wider toward the outer peripheral portion of the sprocket, so that the lateral side surface of the concave portion has a guiding function of the cord-like body. However, it is possible to smoothly insert the cord-like body into the recess.

According to the article storage device of the sixth aspect,
A storage unit for storing a plurality of articles arranged in a depth direction from an entrance for carrying in / out articles is provided, and the sprocket according to any one of claims 1 to 5 is provided on the entrance side of the storage unit, and A rotating body is provided on the back side of the storage portion, and an endless body having a roller chain and a string-like body is hung in a forward and reverse direction freely over a sprocket and the rotating body, and the endless body in the upper movement path is moved. Since the article is configured to be placed on the roller chain, and a guide member for supporting the roller portion of the roller chain in the upper moving path on which the article is placed is provided along the lower side of the upper moving path. Of the endless body provided between the entrance side and the back side of the storage part, the part that is not wound around the sprocket can be replaced with an inexpensive string-like body such as a wire. It can also be replaced by a string-like body to the portion of round, and only the portion necessary for the article placed on the roller chain, thereby reducing the size of the structure of the storage device.

[0011] According to the article storage device of claim 7,
Since the roller chain of the article mounting portion is constituted by a roller chain with a bearing that supports the roller portion via a rolling bearing, it is considerably more expensive than a normal roller chain without a rolling bearing. However, by supporting the roller portion of the roller chain with the bearing by the guide member, the relative movement of the roller portion with respect to the guide member is also smooth, and it is possible to carry out a smooth article transfer with less power,
In addition, the entire article placement portion is not made up of an expensive roller chain with a bearing, but rather the placement range of one article placed on the innermost side and the placement of one article placed on the most entrance / exit side. Since only the article mounting portion excluding the area is constituted by the roller chain with the bearing, the expensive roller chain with the bearing can be reduced to the necessary minimum length.

The mounting range of one article to be placed on the innermost side of the article placing portion is constituted by a movable frame movable along the guide member, and a rolling bearing is mounted on the movable frame. A plurality of rollers are provided to support the movable frame body, and the rollers of the movable frame body are configured to be supported by the guide member. Therefore, it is only necessary to move the rollers along the upper moving path, and the upper moving path and By replacing the innermost article mounting portion that does not need to be engaged with the sprocket for direction change with the lower moving path with the movable frame, while contributing to shortening of the roller chain with a bearing as described above, In addition, smooth transportation of articles is not impaired. Furthermore, the placement range of one article placed on the most entrance side of the article placement portion is configured by a normal roller chain, and the roller portion of the normal roller chain is configured to be supported by the guide member. For example, by carrying in while pushing in with a forklift or the like, it moves relatively to the guide member, but relatively does not relatively move with the weight of the article on the entrance-side article placement portion. By replacing the roller chain with a normal roller chain, it is possible to contribute to shortening of the roller chain with a bearing without impairing smooth article conveyance, and it is possible to greatly reduce the cost of the entire apparatus.

[0013] According to the article storage device of the eighth aspect,
Since a plurality of storage sections for storing articles arranged side by side are provided in a state of being arranged in a vertical direction and a horizontal direction, a large number of articles can be stored, and the entrance and exit of each storage section,
Since they are provided in the same direction, articles can be carried in and out of each storage section from the same direction, and the entrance / exit side is inclined so as to be lower, and the inclination causes the roller chain with a bearing to enter / exit from the entrance / exit side. Since there is no need to provide a special biasing means such as a spring, it is possible to convey articles to the entrance / exit side simply by inclining the device, and further reduce the cost of the device. be able to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sprocket according to the present invention and an article storage device using the sprocket will be described with reference to the drawings. This sprocket is used for an article storage device as shown in FIG. 1 and the like, and the article storage device is composed of a plurality of main pillars 1 standing vertically.
And a metal structure entirely framed by cross beams 2 and reinforcing beams 3 connecting these main columns 1,
A plurality of entrances 4 for carrying in / out the articles A are provided in front of each other in a state of being parallel in the vertical and horizontal directions. From the respective entrances 4 toward the rear in the depth direction, a plurality of articles A are arranged in a row in a state where they are placed on a pallet P and are stored in a storage section 5. It is inclined to be slightly lower.
In this embodiment, the top floor of the structure is also configured as the storage section 5, and therefore, the front of the storage section 5 on the top floor is also configured as the entrance 4.

As shown in FIG. 2, a pair of right and left frame members 6 are provided below the inside of each of the storage portions 5 over the entire length in the front-rear direction as viewed from the entrance 4 side. It is fixed appropriately. As shown in FIG. 7, the frame 6 is an integrally molded product made of a metal material having a U-shaped cross section, and is disposed with its U-shaped opening facing down. A plurality of left tongue pieces 7a and right tongue pieces 7b are integrally formed. A guide rail 8 having a rectangular cross-sectional shape as a guide member is fitted and held between the left and right tongue pieces 7a and 7b thus formed, and the guide rail 8 is attached to the upper sides of the pair of left and right frame bodies 6. The guide rail 8 is configured to support a roller portion of a roller chain, which will be described later.

As shown in FIGS. 3 and 4, a sprocket 9 is provided near the front end of each frame 6, in other words, closer to the entrance 4 than the front end of the guide rail 8. As shown in FIGS. Each of the sprockets 9 is rotatably held by the frame body 6, and the upper part of each sprocket 9 is held in the upper side of the frame body 6 so as to protrude upward from the cutout portion of the opening. As shown in FIGS. 5 and 6, a pulley shaft 11 penetrating the elongated hole 10 is provided near the rear end of each frame 6, and a pulley 12 as a rotating body can be relatively rotated on the pulley shaft 11. The upper portion of the pulley 12 is also formed so as to protrude upward from the cutout portion of the opening at the upper side of the frame 6.

A pulley shaft 11 for holding the pulley 12
Is fixedly inserted into a U-shaped tension bracket 13 located outside the frame 6 in a plan view, and a bolt 14 is screwed to the tension bracket 13 so as to be relatively rotatable. Is configured to contact the lid 15 fixed to the rear end of the frame 6. That is, by rotating the bolt 14 from the rear of each frame 6, the position of the pulley shaft 11 holding the pulley 12 is changed along the long hole 10 of the frame 6, so that each sprocket 9 and the pulley 12 It is configured so that the interval can be changed and adjusted.

The sprocket 9 and the pulley 12 of each frame 6 are composed of a roller chain 16 with a bearing, a normal roller chain 17, a wire 18 as a string, and a metal movable frame 19. Endless body is hung. As shown in FIGS. 8 and 9, the roller chain 16 with a bearing is a special roller chain having a small frictional resistance in which a roller portion 20 is relatively rotatably held by a roller pin 22 via a needle-shaped rolling bearing 21. The chain plate 23 is bent toward the upper surface, and the bent chain plate 23 forms an article mounting surface B on which the article A is mounted. On the other hand, the normal roller chain 17 has its roller portion 2
4 is the roller pin 2 without the rolling bearing 21 as described above.
5 is a general ordinary roller chain which is held so as to be relatively rotatable.
Is also bent to the upper surface side to form an article mounting surface B, and the roller chain 16 with the bearing and the normal roller chain 17 are formed at the same chain pitch.
7 are configured so that both of them can rotate on each guide rail 8.

As shown in FIG. 10, the movable frame 19 has a U-shaped cross section with an open bottom, and a plurality of needle-shaped rolling bearings 27 are provided in the internal space of the movable frame 19. A plurality of rollers 29 having a small frictional resistance are rotatably provided, and the plurality of rollers 29 rotate on the guide rails 8 so that the movable frame 19 moves smoothly along the guide rails 8. The upper surface thereof is configured as an article mounting surface B, and as shown in FIG. 5, a stopper against which the pallet P or the article A contacts the rear end of each movable frame 19. 30 is fixed. A roller chain 16 with a bearing is connected to an end of the movable frame 19 on the entrance 4 side, and a normal roller chain 17 is connected to an end of the roller chain 16 on the entrance 4 side of the movable frame 19. The article mounting surface B on the upper surface of the roller frame 19 and the article mounting surface B on the upper surfaces of the chain plates 23 and 26 of the roller chains 16 and 17 are substantially flush with each other. And the normal roller chain 17 are connected to one wire 1
8.

That is, the article mounting surface B on the upper surface of the movable frame 19 and the chain plates 23,
It is configured such that the article A can be placed together with the pallet P on the article placement surface B on the upper surface 26. Therefore, as shown in FIG. 11B, the movable frame 19 and the roller chains 16, 17 are provided.
Has a length L substantially equal to the length of the guide rail 8, and the normal roller chain 17 and the movable frame 19 each have a length L1 substantially equal to one pallet.
The roller chain 16 with a bearing is configured to have a length L2 obtained by subtracting the length 2 × L1 of two pallets from the length L substantially equal to the guide rail 8. Therefore,
The wire 18 has a length obtained by adding a half circumference of the sprocket 9 and a half circumference of the pulley 12 to a length L substantially equal to the guide rail 8 including the connecting tools 31 at both ends thereof. Chains 16, 17 and a wire 18 are wound around a sprocket 9 on the entrance 4 side, and a wire 18 is wound around a pulley 12 at the rear, comprising both roller chains 16, 17, a movable frame body 19 and a wire 18. An endless body is stretched over each sprocket 9 and the pulley 12, and is configured to be rotatable forward and backward along an upper moving path and a lower moving path.

As described above, since the roller chains 16, 17 and the wire 18 are wound around each sprocket 9,
Each sprocket 9, as shown in FIGS. 3 and 12,
The roller chains 16, 17 are arranged over the entire outer periphery.
A plurality of teeth 32 are provided, and a recessed portion 33 into which the wire 18 is inserted and wound is provided at the center of the tooth apex surface of each tooth 32 in the direction of the tooth width b. Each of the recessed portions 33 is formed such that both lateral side surfaces are formed as inclined surfaces, and the width of the recessed portion 33 is gradually increased toward the outer peripheral side of the sprocket 9, and the wire 18 enters the recessed portion 33. When the wire is wound, the diameter D connecting the center of the wound wire 18 is substantially the same as the diameter d of the pitch circle PC of the sprocket 9. Therefore, both in the state where both roller chains 16 and 17 are engaged with each sprocket 9 and in the state where the wire 18 enters and is wound around the concave portion 33 of each sprocket 9, both the roller chains 16 and 17 and the wire 18 are used. The tension of the endless body made of the above-mentioned material does not change much, and the endless body can always be stretched with a substantially constant tension.

The lower opening of each frame 6 is closed by a guide plate 34, as shown in FIG.
A chain stopper 35 to which a connecting tool 31 for connecting the normal roller chain 17 and the wire 18 contacts is fixed, and the connecting tool 31 contacts the chain stopper 35 as shown in FIG. By this, the rotation of the endless body including the roller chains 16, 17 and the wire 18 in the counterclockwise direction is restricted, and the rotation of the endless body in the counterclockwise direction is restricted. The body 19 is configured to be located at the end on the entrance 4 side of the upper movement path. Also, as shown in FIGS. 5 and 6, on the rear end side of each frame body 6,
Another chain stopper 37 is fixed by a bolt / nut 36, and the movable frame 1
9 is brought into contact with the stopper 30, which is fixed,
As shown in (b), the endless body is configured to restrict the clockwise rotation.

As shown in FIGS. 3 and 4, a pallet on the article mounting surface B of the roller chains 16, 17 and the movable frame 19 is provided at the end of the endless body on the side of the entrance 4 in the upper moving path. A stopper member 39 for stopping the movement of the P or the article A and preventing it from falling is fixed by bolts and nuts in a state where the stopper member 39 is slightly inclined with respect to the horizontal direction in a side view so that the entrance 4 side is higher. I have. That is, since the entire article storage device is inclined so that the entrance 4 side becomes lower, the article placement surfaces B of both the roller chains 16 and 17 and the movable frame 19 are slightly closer to the entrance 4 side in the upper moving path. It is inclined to be lower. As shown in FIG. 3, a stopper member 39 is provided on the inclined article mounting surface B.
The upper surface 40 of the product has an article placement surface B at the end on the entrance 4 side.
The pallet P and the article A are abutted with the pallet P and the article A at the rear end of the stopper member 39 so as to be located below the article placement surface B. A stopper 41 for preventing falling is extended upward.

The loading and unloading of the articles A to and from the article storage device is usually performed by using a forklift. To load the articles A into the empty storage section 5, the articles A are lifted together with the pallets P by the forklift, and the entrance and exit are provided. The pallet P on which the article A is placed from 4 is placed on the article placing surface B of both the roller chains 16, 17 and the movable frame 19. When the storage portion 5 is empty, the endless body composed of the two roller chains 16, 17 and the wire 18 is inclined so that the side of the entrance 4 is lower, so the two roller chains 1 heavier than the wire 18 are provided.
Depending on the weight of the movable frame 19 and the movable frame 19, a biasing force for moving the movable frame 19 toward the entrance 4 acts, and a coupling tool 31 for coupling the normal roller chain 17 and the wire 18. Is brought into contact with the chain stopper 35, the movable frame 19 is positioned at the end of the upper moving path on the side of the entrance 4 as described above, the roller chain 16 with a bearing engages the sprocket 9, and the wire 18 is wound.

Therefore, the article A lifted by the forklift is moved together with the pallet P onto the upper surface 4 of the stopper member 39.
When the pallet P is slightly pushed inward while being positioned on the article mounting surface B of the movable frame 19, the pallet P comes into contact with the stopper 30 of the movable frame 19 located on the left and right, and both movable frames 19 are synchronized. And pushed together. After pressing the article A together with the pallet P by an appropriate distance, the upper surface 4 of the stopper member 39
0 and the movable frame 19 are placed on the article mounting surface B, the article A moves to the entrance 4 along with the left and right movable frames 19 by the biasing force due to the inclination, and the pallet P is moved to the stopper of the stopper member 39. Further contact with 41 prevents further movement. In order to subsequently carry in the articles A, the articles A are lifted together with the pallets P by a forklift, and the pallets P, which have been carried in earlier, are pushed inward and placed in a state where they are pushed in an appropriate distance. P contacts the stopper 41 and stops.

As described above, the articles A are sequentially pushed in together with the pallets P and are carried in. At the time of the pushing, the rollers 29 of the movable frame 19 and the roller section 20 of the roller chain 16 with bearings are moved with respect to the guide rails 8. The roller 29 of the movable frame 19 is held by the pin 28 via the rolling bearing 27, and the roller portion 20 of the roller chain 16 with the bearing is held by the roller pin 22 via the rolling bearing 21. As a result, the roller 29 and the roller portion 20 rotate smoothly, and the article A can be pushed in along with the pallet P relatively easily. At that time,
A roller chain 16 with a bearing engages the sprocket 9, and a wire 18 winds around the pulley 12. However, in a state where the number of articles A stored is one less than the predetermined number of storage in the storage section 5, the sprocket The normal roller chain 17 is engaged with 9.

In the state where the normal roller chain 17 is engaged with the sprocket 9 as described above, when the article A is further pushed in and loaded, the roller portion 24 of the normal roller chain 17 is brought into contact with the guide rail 8. Will move. However, at this time, the article A is lifted and pushed by the forklift together with the pallet P, so that the load of the article A does not act on the normal roller chain 17, and the article A can be pushed and carried in easily. When the last article A is pushed in and carried in, the normal engagement of the roller chain 17 with the sprocket 9 is released, and the wire 18 enters the concave portion 33 of the sprocket 9 and is wound. A predetermined number of articles A are stored in each storage section 5
When the article A is further attempted to be carried in the state in which the article A has been carried in, the stopper 30 of the movable frame 19 abuts against the chain stopper 37, and the carry-in of a predetermined number or more is prevented, and the carried-in article A is carried out. On the contrary to the time of loading,
The articles A on the side of the doorway 4 are sequentially lifted up together with the pallets P by a forklift and taken out.

[Another Embodiment] In the above embodiment,
One wire 18 is connected to the normal roller chain 17 and the movable frame body 19 in a state of being located at the center in the lateral direction. Therefore, the recessed portion 33 into which the wire 18 enters is connected to the sprocket 9.
Although the example in which the tooth 32 is provided at the center portion in the face width b direction of the tooth 32 is shown, the wire 18 is connected to a position eccentric in the lateral direction with respect to the normal roller chain 17 and the movable frame 19, and accordingly, The recess 33 may be provided at a position eccentric from the center of the tooth width b of each tooth 32.

Further, the wire 18 is not necessarily limited to one wire, and the normal roller chain 17 and the movable frame 19 can be connected by a plurality of wires 18. The number of the concave portions 33 corresponding to the number of
Must be provided on the teeth 32 of the sprocket 9. Further, when the normal roller chain 17 and the movable frame 19 are connected by two wires 18, as shown in FIG. 13, concave portions 33 into which the wires 18 enter are provided on both sides of the teeth 32 of the sprocket 9. It can also be implemented. Also in this case, by forming the diameter D connecting the center of the wire 18 inserted into the concave portion 33 to be substantially the same as the pitch circle PC of the sprocket 9, the two roller chains 16, 1 can be formed.
The tension of the endless body composed of the wire 7 and the wire 18 can be kept almost constant at all times.

In the above embodiments, the wire 1
Although the example in which the sprocket 9 having the recessed portion 33 for 8 is used in the article storage device is shown, the application of the sprocket 9 is not necessarily limited to the article storage device.
The roller chains 16, 17 connected to a string such as a wire 18 can be used in various devices for changing the direction. In this case, when the amount of movement of the roller chains 16, 17 and the wire 18 with respect to the sprocket 9 is small, it is not necessary to provide the teeth 32 and the recessed portions 33 over the entire outer periphery of the sprocket 9. Various changes can be made in actual implementation, such as providing teeth 32 and providing recesses 33 in other portions.

When the sprocket 9 is used in an article storage device, a normal roller chain 17 and the movable frame 1 are used.
9 is substantially equal to the length L1 of one pallet, and the total length of the movable frame 19 and the roller chains 16, 17 is set to the length L substantially equal to the guide rail 8.
Due to the length of one chain constituting both roller chains 16 and 17, it is no longer possible to make it slightly longer or shorter, and in that case, the roller chain 16 with a bearing is preferred in consideration of safety. It is desirable to make the movable frame 19 slightly longer in order to avoid interference with the sprocket 8 and to make it slightly longer.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire article storage device.

FIG. 2 is a partially cutaway plan view of an article storage unit.

FIG. 3 is a side view of an entrance / exit side of the article storage unit.

FIG. 4 is a plan view of an entrance / exit side of the article storage unit.

FIG. 5 is a side view of a rear end side of the article storage unit.

FIG. 6 is a plan view of a rear end side of the article storage unit.

FIG. 7 is a sectional view of a frame and a guide member.

FIG. 8 is a longitudinal sectional side view of a roller chain.

FIG. 9 is a cross-sectional plan view of a roller chain.

FIG. 10 is a sectional view of a movable frame.

FIG. 11 is a schematic side view of an article storage unit.

FIG. 12 is a sectional view of a sprocket.

FIG. 13 is a cross-sectional view of a sprocket showing another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 4 entrance 5 storage section 8 guide member 9 sprocket 12 rotating body 16 roller chain with bearing 17 ordinary roller chain 18 string-like body 19 movable frame body 20 roller part of roller chain with bearing 21 rolling bearing of roller chain with bearing 24 normal Roller part of roller chain 27 Rolling bearing of movable frame 29 Roller of movable frame 32 Sprocket teeth 33 Recess A A Article b Tooth width

Claims (8)

[Claims] 1. A sprocket in which a plurality of teeth meshing with a roller chain are provided on an outer peripheral portion, the sprocket having a concave portion for inserting and winding a cord-like body around the outer peripheral portion of the sprocket. 2. The sprocket according to claim 1, wherein the plurality of teeth are provided over the entire outer periphery of the sprocket, and the recess is provided over the entire outer periphery of the sprocket. 3. The sprocket according to claim 1, wherein the concave portion is provided at an intermediate portion in a tooth width direction of a tooth tip surface of the plurality of teeth. 4. The sprocket according to claim 3, wherein the concave portion is provided at a central portion in a width direction of the plurality of teeth. 5. The sprocket according to claim 1, wherein a lateral side surface of the concave portion is formed as an inclined surface, and the lateral width of the concave portion increases toward an outer peripheral portion of the sprocket. The sprocket according to 1. 6. An article storage device using the sprocket according to claim 1, wherein a plurality of articles are arranged and stored in a depth direction from an entrance for carrying in / out articles. The sprocket is provided on the entrance side of the storage part, and a rotating body is provided on the back side of the storage part, and the endless body having a roller chain and a string-like body over the sprocket and the rotating body is correctly fixed. A guide that is rotatably hung in a reverse direction so that the article can be placed on the roller chain in the upper end moving path of the endless body, and supports the roller portion of the roller chain in the upper moving path on which the article is placed. An article storage device, wherein a member is provided below the upper moving path. 7. An article mounting part of the endless body excluding a mounting range of one article mounted on the innermost side and a mounting range of one article mounted on the most entrance side. Only the placement portion is constituted by a roller chain with a bearing that supports the roller portion via a rolling bearing, and the guide member defines the placement range of one article placed on the innermost side of the article placement portion. And a plurality of rollers supported on the movable frame body via rolling bearings, and one article placed on the most entrance side of the article placement portion. And the guide member supports the roller portion of the roller chain with the bearing, the roller of the movable frame, and the roller portion of the normal roller chain. Make up The article storage device according to claim 6. 8. The storage unit is provided with a plurality of storage units arranged in parallel in the vertical and horizontal directions, and the entrance of each storage unit is
8. The article storage device according to claim 6, wherein the article storage device is provided in the same direction and is inclined so that the entrance / exit side is lowered, and the inclination causes the roller chain with bearing to move toward the entrance / exit side. 7.