JP7535011B2 - Conveyor - Google Patents

Description

The present invention relates to a transport device that transports objects.

Patent document 1 discloses a flat-shaped plug hole for an automobile as an object to be transported.

Japanese Patent Application Publication No. 09-002337

In the case of the automotive plug holes disclosed in the above-mentioned Patent Document 1, these automotive plug holes are produced in large numbers, and a block may be formed by stacking a number of the produced automotive plug holes into a mass. In such cases, it is necessary to disassemble the block of automotive plug holes into individual automotive plug holes. In this disassembly process, there is a demand for a device that can perform the disassembly work automatically, rather than by a worker doing it manually. In order to realize a device that can perform the disassembly work automatically, a transport device is required that can automatically transport and send out a block of automotive plug holes (transport object).

The present invention has been made to solve the above-mentioned problems, and aims to provide a conveying device suitable for automatically conveying and sending out objects to be conveyed.

To solve the above problems, the conveying device according to the present invention is a conveying device that conveys and sends out an object to be conveyed, and is characterized by comprising a pair of rollers that are formed in a cylindrical shape and arranged parallel to each other, and that can convey the object along the axial direction while rotatably supporting the object to be conveyed, and a drive device that drives and rotates the pair of rollers in the same direction.

According to the conveying device of this invention, a pair of rollers are driven to rotate in the same direction by a driving device, making it possible to convey an object along the axial direction while rotatably supporting it. This allows the conveying device to automatically convey and send out the object. As a result, it is possible to provide a conveying device suitable for automatically conveying and sending out the object.

In the transport device according to the present invention, it is preferable that the tip of the roller is provided with a protrusion that is convex toward the outside in the radial direction of the roller and is capable of contacting a part of the front edge of the object to be transported. This makes it possible to reliably break up the blocks of multiple transport objects that have been transported by the protrusion.

The transport device according to the present invention preferably further comprises a rotating member that is formed in a cylindrical shape and rotatably arranged above the tip of the roller so as to intersect the roller three-dimensionally, and the lower end of the rotating member during rotation can come into contact with the upper end of the transport object. This makes it possible to reliably break up the blocks of multiple transport objects that have been transported by the rotating member.

In the transport device according to the present invention, it is preferable that the rotation direction of the rotating member is a rotation direction in which a force in the opposite direction to the transport direction in which the transport object should be transported is applied to the transport object at the contact point with the transport object. This makes it possible to reliably break up blocks of multiple transport objects that have been transported by the rotating member.

The transport device according to the present invention preferably further comprises an upper guide member that is formed in a cylindrical shape and arranged parallel to the rollers to support and guide the upper part of the transport object. This makes it possible for the upper guide member to reliably guide the multiple transport object blocks that are transported.

The transport device according to the present invention preferably further comprises a lower guide member that is formed in a cylindrical shape and arranged parallel to the rollers to support and guide the lower part of the transport object. This makes it possible for the lower guide member to reliably guide the numerous transported blocks of transport objects.

The transport device according to the present invention preferably further comprises a back support member that supports the back of the transport object during transport. This makes it possible to transport a large number of transport objects together reliably using the back support member.

In the conveying device according to the present invention, it is preferable that the object to be conveyed is formed so that the cross-sectional shape along the conveying direction of the object to be conveyed is asymmetric. This makes it possible to convey the object to be conveyed in the conveying direction, and thus makes it possible to reliably convey a large number of objects to be conveyed.

This invention makes it possible to provide a transport device suitable for automatically transporting and sending out transport objects.

1 is a plan view showing an embodiment of a conveying device 10 according to the present invention. 2 is a cross-sectional view showing the conveying device 10 shown in FIG. 1 taken along line II-II. FIG. 2 is a perspective view showing an internal structure of the conveying device 10 shown in FIG. 2 is a front view showing the internal structure of the conveying device 10 shown in FIG. 1. 2 is a front view of an object 30 to be transported by the transport device 10 shown in FIG. 1 . FIG. 5B is a side view of the transport object 30 shown in FIG. 5A. 5C is a cross-sectional view showing the transport object 30 shown in FIG. 5A taken along line 5C-5C.

One embodiment of the conveying device according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to this embodiment, and can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art.

The conveying device 10 is a device that conveys and sends out the conveying object 30. As shown in Figs. 1 to 4, the conveying device 10 includes a housing 11, a pair of rollers 12a, 12b, roller drive devices 13a, 13b, protrusions 14a, 14b, a rear support member 15, a rear support member drive device 16, a rotating member 17, a rotating member drive device 18, upper guide members 21a, 21b, and a lower guide member 22. Note that in Fig. 1, the left-right direction of the paper surface is the front-rear direction of the conveying device 10, and the up-down direction of the paper surface is the left-right direction of the conveying device 10. Also, in Fig. 2, the left-right direction of the paper surface is the front-rear direction of the conveying device 10, and the up-down direction of the paper surface is the up-down direction of the conveying device 10.

The housing 11 is formed in a box shape with a bottom 11a formed in a rectangular plate shape and a wall 11b that is U-shaped in a plan view. The wall 11b is formed in a U-shape that opens toward the front, and includes left and right side walls 11b1 and 11b2, and a rear wall 11b3. The left wall 11b1 is integrally formed with the left end of the bottom 11a, the right wall 11b2 is integrally formed with the right end of the bottom 11a, and the rear wall 11b3 is integrally formed with the rear end of the bottom 11a. Furthermore, the housing 11 has an upper opening 11c that opens toward the top and a front opening 11d that opens toward the front.

The upper opening 11c functions as an input opening for inputting the transport object 30 into the housing 11. The front opening 11d functions as an output opening for removing the transport object 30 transported inside the housing 11 to the outside.

A pair of rollers 12a, 12b are provided within the housing 11. The rollers 12a, 12b are formed in a tubular shape (cylindrical in this embodiment) and are arranged parallel and horizontal to each other, and can transport the transport object 30 along the axial direction while rotatably supporting the transport object 30. Since the pair of rollers 12a, 12b has the function of supporting the transport object 30, it is preferable to set the distance between the rollers 12a and 12b to a value smaller than the diameter (maximum width) of the transport object 30.

The pair of rollers 12a, 12b are formed in a cylindrical shape, but are not limited to a cylindrical shape, and may be formed in other shapes (e.g., polygonal, etc.) as long as they can rotatably support the transport object 30. In addition, the pair of rollers 12a, 12b may be arranged tilted vertically rather than horizontally.

The roller 12a is rotatably supported by a roller drive device (drive device) 13a. The roller drive device 13a incorporates a bearing portion (not shown) that rotatably supports one end (base end) of the roller 12a, and the roller 12a has a cantilever structure in which one end of the roller 12a is supported by the roller drive device 13a (bearing portion) and the other end is free. The roller drive device 13a incorporates an electric drive source (e.g., an electric motor) for rotating an output shaft (rotating shaft; not shown), and drives the drive source to rotate the output shaft. One end of the roller 12a is connected to the output shaft, and the roller 12a is rotated around the shaft by the roller drive device 13a. The roller drive device 13a may incorporate a reduction mechanism that reduces the driving force of the drive source, and may adopt a drive source other than the electric drive source (e.g., an air drive source) as the drive source.

Similarly to roller 12a, roller 12b is rotatably supported by roller drive device 13b. Roller 12b is driven to rotate around its axis by roller drive device 13b. Roller drive devices 13a and 13b drive rollers 12a and 12b to rotate in the same direction (same rotation direction).

The inventors have found that when an object 30 to be transported is placed on rollers 12a and 12b that are rotated in the same direction, the object 30 is transported along the axial direction of rollers 12a and 12b as rollers 12a and 12b rotate. For example, in FIG. 4, when rollers 12a and 12b are rotated clockwise, the object 30 to be transported that is placed in contact therewith is given a rotational force that rotates counterclockwise at the contact point, and is also given a propulsive force in the transport direction (forward). In other words, the object 30 to be transported is transported along the transport direction while rotating due to the rotation of the pair of rollers 12a and 12b.

For example, in FIG. 4, when rollers 12a and 12b are rotated counterclockwise, the transport object 30 placed in contact therewith is given a rotational force that rotates it clockwise at the contact point, and is also given a propulsive force in the transport direction (forward). In other words, the transport object 30 is transported along the transport direction while rotating due to the rotation of the pair of rollers 12a and 12b.

For example, in FIG. 4, when the roller 12a is rotated clockwise and the roller 12b is rotated counterclockwise, the transport object 30 placed in contact therewith is given a rotational force that rotates counterclockwise at the contact point with the roller 12a and clockwise at the contact point with the roller 12b. Therefore, the resultant force acting on the transport object 30 at the two contact points is downward, and the transport object 30 is pulled between the pair of rollers 12a and 12b by this resultant force and is not transported in the transport direction. Also, for example, in FIG. 4, when the roller 12a is rotated counterclockwise and the roller 12b is rotated clockwise, the transport object 30 placed in contact therewith is given a rotational force that rotates clockwise at the contact point with the roller 12a and counterclockwise at the contact point with the roller 12b. Therefore, the resultant force acting on the transport object 30 at the two contact points is directed upward, and the resultant force causes the transport object 30 to be repelled by the pair of rollers 12a, 12b and not transported in the transport direction.

A protrusion 14a is provided at the other end (tip) of the roller 12a. The protrusion 14a is provided at the tip of the roller 12a in a convex shape toward the radial outside of the roller 12a, and can contact a part of the front periphery of the transport object 30 (see Figures 3 and 4). In this embodiment, a circular plate-shaped member 14a1 (e.g., a washer) is used as the protrusion 14a. The circular plate-shaped member 14a1 is fixed to the tip of the roller 12a coaxially with the roller 12a by screwing or the like. It is preferable that the protrusion amount of the circular plate-shaped member 14a1 from the roller 12a (protrusion amount of the protrusion 14a) is set to a value that the transport object 30 can overcome. It is preferable that the protrusion direction of the protrusion 14a includes the radial direction from the center of the roller 12a toward the contact part between the roller 12a and the transport object 30. In addition, the protrusion 14b is provided at the other end (tip) of the roller 12b, similar to the protrusion 14a. A circular plate-shaped member 14b1 (e.g., a washer) is used as the protrusion 14b.

When the protrusions 14a, 14b come into contact with a part of the front edge (the lower left and lower right in this embodiment) of the leading transport object 30 that has been transported to the tip of the rollers 12a, 12b, they restrict the movement of the leading transport object 30. On the other hand, the leading transport object 30 is pushed by the following transport objects 30, so a force is applied in the forward direction. Therefore, the leading transport object 30 is likely to fall forward because a forward force from the following transport objects 30 acts on it with the contact point with the protrusions 14a, 14b as a fulcrum. As a result, the transport objects 30 that have been sent in succession come into contact with the protrusions 14a, 14b and fall forward, making it easy to separate them one by one.

The protrusions 14a and 14b are not limited to circular plate-shaped members, and elliptical plate-shaped members, polygonal plate-shaped members, etc. may also be used. The circular plate-shaped members may also be provided eccentrically rather than coaxially with the roller 12a. In this case, it is preferable that the eccentric direction is the radial direction from the center of the roller 12a toward the contact point between the roller 12a and the transported object 30.

The rear support member 15 is a member that supports the rear of the transport object 30 during transport. The rear support member 15 is preferably set to a size that can support at least the lower half of the rear of the transport object 30. This makes it possible to reliably prevent the transport object 30 from falling backward when a force acts on the transport object 30 to tilt it backward (for example, when the upper end of the transport object 30 is pushed backward by the rotating member 17). The rear support member 15 is reciprocated (linearly moved) by the rear support member drive device 16 in the transport direction of the transport object 30.

The rear support member drive device 16 comprises a drive device main body 16a, an output rod 16b1, and a connecting part 16b2. The drive device main body 16a has an air drive source built in for driving the output rod 16b1, and the output rod 16b1 is driven (linearly moved) by supplying air to the air drive source. The tip of the output rod 16b1 is connected to the connecting part 16b2 which is connected to the rear support member 15.

The rotating member 17 is formed in a cylindrical shape and is rotatably disposed above the tips of the rollers 12a and 12b so as to intersect with the rollers 12a and 12b in a three-dimensional manner. The lower end of the rotating member 17 can contact the upper end of the transport object 30 while rotating. The rotating member 17 has a main body portion 17a formed in a cylindrical shape (cylindrical in this embodiment) and a shaft portion 17b that is coaxial with the central axis of the main body portion 17a and is integrally disposed with the main body portion 17a.

The main body 17a is formed in a cylindrical shape from an elastic material (elastic material). Elasticity is the property of being deformed when a force is applied and returning to the original shape when the force is removed. In this embodiment, the main body 17a is formed in a cylindrical brush shape and has many bristles arranged radially outward from the central axis of the main body 17a. The bristles may be made of vegetable, animal, metallic, synthetic fiber, or the like. The main body 17a may be formed in a cylindrical shape from an elastic material such as a sponge material or a rubber material. The main body 17a may be formed in a cylindrical shape, and is not limited to a cylindrical shape, but may be formed in other shapes such as a polygon.

When the main body 17a is formed in a cylindrical brush shape, the contact time (contact load) when it comes into contact with the transported object 30 can be reduced, which makes it possible to improve the wear resistance of the main body 17a. On the other hand, when the main body 17a is formed in a cylindrical shape using an elastic material, the contact time (contact load) when it comes into contact with the transported object 30 can be increased, which makes it possible to apply force more reliably to the upper part of the transported object 30.

The radius of the main body 17a and the location of the shaft 17b are preferably set so that the lower end of the rotating main body 17a comes into contact with the upper end of the transport object 30 being transported. In this way, the main body 17a is positioned so that the lower end of the rotating main body 17a reliably comes into contact with the upper end of the transport object 30 being transported. The amount of contact in the radial direction of the transport object 30 is preferably set to a value equal to or less than the amount of protrusion of the protrusion 14a.

The left and right ends of the shaft 17b are rotatably supported by the left and right side walls 11b1 and 11b2 of the wall 11b. The shaft 17b is disposed above the tips of the rollers 12a and 12b so as to intersect three-dimensionally with the rollers 12a and 12b (twisted positional relationship). The shaft 17b is rotated by a rotating member driving device 18 attached to either the left or right side wall 11b1 or 11b2. In this embodiment, the rotating member driving device 18 is attached to the left side wall 11b1.

The rotating member driving device 18 has a built-in electric driving source (e.g., an electric motor) that drives an output shaft (rotating shaft; not shown) to rotate, and drives the driving source to rotate the output shaft. Either the left or right end of the shaft portion 17b is connected to the output shaft, and the shaft portion 17b is driven to rotate around the axis by the rotating member driving device 18. The rotating member driving device 18 may have a built-in speed reduction mechanism that reduces the driving force of the driving source, and may employ a driving source other than the electric driving source (e.g., an air driving source) as the driving source.

It is preferable that the rotation direction of the rotating member 17 is a rotation direction in which a force in the opposite direction to the conveying direction in which the conveying object 30 should be conveyed is applied to the conveying object 30 at the contact point with the conveying object 30. In this embodiment, the conveying direction of the conveying object 30 is the forward direction, and the rotation direction of the rotating member 17 and therefore the main body part 17a is the counterclockwise direction in FIG. 2. When the rotating member 17 rotates in the counterclockwise direction, a force in the opposite direction to the conveying direction (rearward direction) is applied to the contact point, i.e., the upper part, of the conveying object 30. On the other hand, a force in the conveying direction (forward direction) is applied to the lower part of the conveying object 30 by the rotation of the rollers 12a and 12b. In this way, two forces in opposite directions act on the conveying object 30, so that the conveying object 30 tries to rotate clockwise (in FIG. 2). As a result, the lower part of the conveying object 30 located at the front is lifted up and can be easily separated from the conveying object 30 located second from the front. Furthermore, the transport object 30 can easily climb over the protrusions 14a and 14b.

The upper guide members 21a and 21b are formed in a cylindrical shape and are arranged parallel to the rollers 12a and 12b to support and guide the upper part of the transport object 30. In this embodiment, the upper guide members 21a and 21b are preferably formed in a cylindrical shape, and more preferably supported to be rotatable. This makes it possible to reliably guide the transport object 30, which is transported while rotating, while maintaining its rotation. The upper guide members 21a and 21b are attached to the housing 11 via a bracket (not shown).

The pair of upper guide members 21a, 21b are preferably positioned so that they can hold the object 30 from the upper left and right sides to prevent the object 30 from coming off the rollers 12a, 12b during transport. In addition, the axial length of the upper guide members 21a, 21b is preferably set to a value required to align the object 30 close to the discharge position of the object 30 (the tip position of the rollers 12a, 12b) vertically to the transport direction.

The lower guide member 22 is formed in a cylindrical shape and is arranged parallel to the rollers 12a and 12b, and supports and guides the lower part of the transport object 30. In this embodiment, the lower guide member 22 is preferably formed in a cylindrical shape, and more preferably is supported rotatably. This makes it possible to reliably guide the transport object 30, which is transported while rotating, while maintaining its rotation. The lower guide member 22 is attached to the housing 11 via a bracket (not shown).

The axial length of the lower guide member 22 is preferably set to a range in which the transport object 30 may be pushed downward when a downward force is applied to the transport object 30 due to contact with the rotating member 17 during rotation. This makes it possible to prevent the transport object 30 from being pushed downward even when a downward force is applied to the transport object 30 due to contact with the rotating member 17 during rotation.

The transport object 30 is formed in a disk shape from an elastic material (e.g., rubber, synthetic resin, etc.). In this embodiment, the transport object 30 is formed in a disk shape, but is not limited to a disk shape and may be formed in a polygonal disk shape.

As shown in Figs. 5A to 5C, the object 30 to be conveyed includes a bottomed tubular main body 31 and a flange portion 32. The main body 31 is formed in a cylindrical shape. The main body 31 includes a circular bottom 31a and a cylindrical wall portion 31b connected to the periphery of the bottom 31a. A convex portion 31c is formed in the center of the bottom 31a. The flange portion 32 extends radially outward from the tip of the wall portion 31b. The flange portion 32 is formed in an annular shape, and the inner peripheral edge of the flange portion 32 is integrally connected to the tip of the wall portion 31b. It is preferable that the flange portion 32 is formed in a conical shape. In this way, the flange portion 32 obtains a spring action by applying a load to the upper and lower portions of the cone and bending in a direction to lower the height, and obtains a spring action by applying a load in a radially inward direction.

As is clear from FIG. 5C, the object 30 is formed so that the cross-sectional shape along the conveying direction of the object 30 is asymmetric. In detail, of the bottom 31a, the wall 31b, and the flange 32, the bottom 31a is the thickest, the wall 31b is the next thickest, and the flange 32 is the thinnest. The convex portion 31c of the bottom 31a is the thickest. Therefore, in FIG. 5C, the center of gravity of the object 30 is within the bottom 31a and is located to the right of the peripheral edge of the flange 32, which is the contact point between the object 30 and the rollers 12a and 12b. In this embodiment, the object 30 is formed so that the cross-sectional shape is asymmetric, but the cross-sectional shape may be formed so that it is symmetric. In this case, the cross-sectional shape may be elliptical or polygonal.

A sensor 11e is provided in the upper opening 11c of the housing 11, which can detect when an operator inserts an object 30 to be transported. For example, a distance sensor that measures the distance to the object to be measured can be used as the sensor 11e. If the measurement result by the sensor 11e is smaller than a predetermined value, it can be determined that the object 30 to be transported is being inserted, in which case the transport device 10 restricts operations related to the transport. On the other hand, if the measurement result by the sensor 11e is larger than the predetermined value, it can be determined that the object 30 to be transported is not being inserted, in which case the transport device 10 allows operations related to the transport.

Furthermore, the operation of the above-mentioned conveying device 10 will be described. First, a block 30A containing a large number of objects 30 to be conveyed is placed into the housing 11 by an operator and placed on a pair of rollers 12a, 12b.

When the rollers 12a and 12b are driven to rotate in the same direction (same rotation direction) by the roller drive devices 13a and 13b, the block 30A of the transport object 30 is transported forward along the axial direction of the rollers 12a and 12b while rotating the rollers 12a and 12b. The block 30A of the transport object 30 reaches the protrusions 14a and 14b while being guided by the upper guide members 21a and 21b and the lower guide member 22.

The movement of the leading object 30 transported to the tip of the rollers 12a and 12b is restricted by the protrusions 14a and 14b. On the other hand, the leading object 30 is pushed by the following objects 30, so a force is applied in the forward direction. In addition, a force in the opposite direction to the transport direction (rearward direction) is applied to the upper part of the leading object 30 due to the rotation of the rotating member 17. In this way, two forces in opposite directions act on the object 30, so that the object 30 tries to rotate clockwise (in FIG. 2). As a result, the lower part of the leading object 30 is lifted up, and it can be easily separated from the second object 30 from the leading. Furthermore, the object 30 can easily climb over the protrusions 14a and 14b. As a result, the objects 30 that are continuously transported can be easily separated one by one.

(Actions and Effects of the Embodiments)
The conveying device 10 according to the embodiment described above is a conveying device 10 that conveys and sends out the object to be conveyed 30, and is equipped with a pair of rollers 12a, 12b that are formed in a cylindrical shape and arranged parallel to each other, and that can convey the object to be conveyed 30 along the axial direction while rotatably supporting the object to be conveyed 30, and roller driving devices 13a, 13b that rotate and drive the pair of rollers 12a, 12b in the same direction.

According to this conveying device 10, the pair of rollers 12a, 12b are driven to rotate in the same direction by roller driving devices 13a, 13b, making it possible to convey the object 30 along the axial direction while rotatably supporting it. Therefore, the conveying device 10 is capable of automatically conveying and sending out the object 30. As a result, it is possible to provide a conveying device 10 suitable for automatically conveying and sending out the object 30.

The conveying device 10 preferably further includes protrusions 14a, 14b that are provided at the tips of the rollers 12a, 12b in a convex shape that faces radially outward of the rollers 12a, 12b and that can contact a portion of the front periphery of the object 30 to be conveyed. This makes it possible to reliably disassemble the block 30A, which is a collection of multiple conveyed objects 30, by the protrusions 14a, 14b. As a result, the block 30A can be automatically disassembled into individual objects 30 to be conveyed, improving work efficiency.

The conveying device 10 preferably further includes a rotating member 17 that is formed in a cylindrical shape and rotatably arranged above the tips of the rollers 12a and 12b so as to intersect with the rollers 12a and 12b in a three-dimensional manner, and the lower end of the rotating member 17 can contact the upper end of the object 30 during rotation. This makes it possible to reliably break up the blocks 30A of the multiple objects 30 that have been conveyed by the rotating member 17.

In addition, in the transport device 10, it is preferable that the rotation direction of the rotating member 17 is a rotation direction in which a force in the opposite direction to the transport direction in which the transport object 30 should be transported is applied to the transport object 30 at the contact point with the transport object 30. This makes it possible to reliably break up the blocks 30A of the multiple transport objects 30 that have been transported by the rotating member 17.

The conveying device 10 preferably further includes upper guide members 21a, 21b that are formed in a cylindrical shape and arranged parallel to the rollers 12a, 12b to support and guide the upper portion of the conveyed object 30. This makes it possible for the upper guide members 21a, 21b to reliably guide the blocks 30A of the conveyed multiple conveyed objects 30.

The conveying device 10 preferably further includes a lower guide member 22 that is cylindrically shaped and arranged parallel to the rollers 12a and 12b to support and guide the lower portion of the conveyed object 30. This allows the lower guide member 22 to reliably guide the blocks 30A of the conveyed multiple conveyed objects 30.

The transport device 10 preferably further includes a back support member 15 that supports the back of the transport object 30 during transport. This makes it possible to transport a large number of transport objects 30 together reliably using the back support member 15.

In addition, in the conveying device 10, it is preferable that the object 30 to be conveyed is formed so that the cross-sectional shape along the conveying direction of the object 30 is asymmetric. This makes it possible to convey the object 30 in the conveying direction, and thus makes it possible to reliably convey a large number of objects 30 to be conveyed.

10...conveying device, 12a, 12b...rollers, 13a, 13b...roller driving device (driving device), 14a, 14b...protruding part, 15...back support member, 17...rotating member, 21a, 21b...upper guide member, 22...lower guide member, 30...object to be transported.

Claims (6)

A conveying device that conveys and sends out an object to be conveyed,
a pair of rollers formed in a cylindrical shape and arranged in parallel to each other, the rollers being capable of conveying the object in an axial direction from an upstream end side to a downstream end side while contacting a lower portion of the object to be conveyed and rotatably supporting the object ;
A drive device that drives the pair of rollers to rotate in the same direction around an axis ;
a back surface support member for supporting a back surface of the object being transported;
a rear support member driving device that reciprocates the rear support member along the axial direction;
A conveying device comprising: 2. The conveying device according to claim 1, further comprising a protrusion provided at the downstream end of the roller in a convex shape facing radially outward from the roller and capable of contacting a portion of the front edge of the object to be conveyed. The conveying device described in claim 1 or claim 2, further comprising a rotating member that is formed in a cylindrical shape and rotatably arranged above the downstream end of the roller so as to intersect with the roller in three dimensions, wherein a lower end of the rotating member during rotation is capable of contacting an upper end of the object to be conveyed. The conveying device according to claim 3, characterized in that the rotation direction of the rotating member is a rotation direction in which a force in a direction opposite to the conveying direction in which the conveyed object should be conveyed is applied to the conveyed object at the contact point with the conveyed object. The conveying device according to any one of claims 1 to 4, further comprising an upper guide member that is formed in a cylindrical shape and arranged parallel to the rollers to support and guide an upper portion of the conveyed object. The conveying device according to any one of claims 1 to 5, further comprising a lower guide member that is formed in a cylindrical shape and arranged parallel to the rollers to support and guide the lower part of the object to be conveyed.

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