JP6111690B2 - Conveyor device - Google Patents

Description

  The present invention relates to a conveyor device that moves a carrier along a conveyance path including a downward inclined path portion, and more specifically, a conveyor that allows a carrier to self-run by gravity without using a drive device in the downward inclined path portion. Relates to the device.

In a production line for transporting a transported object having a relatively large outer shape and weight, such as an automobile, a conveyor device that transports the carrier carrying the transported object that is movable along a guide rail is used. The carrier is transported on a steeply inclined path by using a power and free trolley conveyor that transports the driven dog of the carrier free trolley with the driving dog of the power chain engaged. (For example, refer to [0011], [0033] and [0056] of Patent Document 1.)
Also, in order to reduce costs and save space, the carrier is allowed to self-propelled by gravity without using a driving device in the downward inclined path, and is transported to a part of the total length in the carrier transport direction. A brake surface extending in the direction is provided, a centrifugal brake is connected to the friction roller to form a braking means, and the braking means is disposed along the conveyance path at the same interval as the entire length in the conveyance direction of the carrier. There is one in which the friction roller is pressed to brake the carrier (see Patent Document 2).

JP 2005-001878 A JP 2011-168356 A

The power and free trolley conveyor can carry the carrier along a relatively steep inclined path, but the power chain, the power trolley, the trolley rail for guiding the power trolley, the take-up portion, and the large diameter Since it is a large-scale device composed of a driving sprocket and a driven sprocket, the manufacturing cost and installation space increase (see, for example, [0036] of Patent Document 1).
On the other hand, since the conveyor apparatus of patent document 2 can make a carrier self-propelled by gravity without using a drive device along the conveyance path | route including a downward inclination path | route part, cost reduction and space saving can be achieved. On the other hand, there is no need to store the carrier in the downward inclined path part, and even when the carrier is simply transported from a high transport height to a low transport height, the carrier moves while repeating the acceleration operation and the deceleration operation. A steep downhill slope portion has a disadvantage that it is difficult to maintain a constant carrier speed due to a short deceleration operation time.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that the manufacturing cost and the installation space can be reduced, and the carrier can be transported smoothly and surely even in the transport path including the steeply inclined downward path portion. The present invention is to provide a conveyor device that allows a carrier to self-run by gravity without using a driving device in a downward inclined path portion that does not store the carrier.

In order to solve the above problem, the conveyor device according to the present invention allows the carrier to self-propelled by gravity in a downward inclined path portion that does not store the carrier, and the carrier along the conveyance path including the downward inclined path portion. The carrier device can be moved in a state of being guided by guide rails installed along the conveyance path, and can be rotated by a connecting rod between a plurality of trolleys separated in the conveyance direction. A friction surface that is continuous over substantially the entire length of the carrier in the conveying direction is formed on the outer surface of the trolley and the connecting rod, and the downward inclined path portion is frictionally applied to the friction surface. the action of the roller, the carrier by gravity while braking by the braking means non-powered formed by connecting the braking device to said friction roller Is run, the friction roller of the brake means and a plurality placed at intervals shorter than the conveying direction length of the carrier, in the conveying path other than the downlink inclined path section, the downlink inclined path section height position horizontal path upstream of the in the low position the horizontal path section downstream of the parts and the downlink inclined path, wherein while pressed against the drive roller to be frictional surface to drive the carrier by the power, the downlink and the drive roller of the high position the horizontal path section The distance between the braking means of the braking means at the most upstream position in the inclined path portion is shorter than the overall length of the carrier in the transport direction, and the friction surface is driven by the driving roller in the high position horizontal path portion. The carrier is pushed into the braking means at the most upstream position in the downward inclined path portion, and the drive roller in the low position horizontal path portion and the uppermost position in the downward inclined path portion. The distance of the braking means at the flow position from the friction roller is shorter than the entire length of the carrier in the conveyance direction. In the low position horizontal path portion, the friction roller is driven by the driving roller while the downward inclined path The carrier is pulled out from the braking means at the most downstream position in the section .

According to such a configuration, since the carrier is driven by gravity in the downward inclined path portion, since there is no drive device, a large device such as a power-and-free trolley conveyor is unnecessary, Cost reduction and space saving can be achieved, and power consumption can be reduced.
In addition, the downward inclined path portion is not configured to brake a part of the entire length in the carrier transport direction as in Patent Document 2, but a friction surface formed continuously over the substantially entire length in the carrier transport direction is braked. Since the carrier does not move while repeating the acceleration operation and the deceleration operation, there is a disadvantage that it is difficult to maintain a constant speed of the carrier because the deceleration operation time is insufficient in the steeply descending slope path portion. There is no.
In addition, the carrier structure can be simplified by causing the friction roller to act on the friction surface driven by the friction roller type driving device of the carrier for braking in the downward inclined path portion.
In addition, the carrier is movable in a state of being guided by guide rails installed along the conveyance path, and a plurality of trolleys separated in the conveyance direction are rotatably connected by a connecting rod. In addition, the distance between the driving roller in the high position horizontal path portion and the friction roller of the braking means at the most upstream position in the descending inclined path portion, and the braking means in the downstream position in the driving roller of the low position horizontal path portion and the descending inclined path portion. Since the distance to the friction roller is shorter than the total length of the carrier in the conveyance direction, the carrier is pushed into the braking means of the inclined path while being driven by the driving roller of the high position horizontal path, and the low position horizontal path is driven. Since the carrier is pulled out from the braking means of the inclined path portion while being driven by the roller, the carrier is removed with a simple configuration in the conveyance path including the downward inclined path portion. And the slip can be reliably conveyed.
Furthermore, by applying a braking torque to the friction roller, it is possible to suppress wear of the friction surface and friction member of the carrier due to sliding.
In addition, since the pressing force per friction roller can be reduced by increasing the number of friction rollers pressed against the carrier, friction roller wear and carrier damage are unlikely to occur, and a large pressing force with a steep slope. Can be reliably conveyed while braking the carrier by a plurality of friction rollers.

Furthermore, it is preferable that a guide roller not connected to the friction roller of the braking means or the braking device is provided so as to sandwich the trolley or the connecting rod together with the friction roller of the braking means.
According to such a configuration, even if the pressing force of the friction roller is increased, since the bending force acting on the connecting rod and the force acting on the side roller of the trolley are small, it is easy to ensure the required pressing force of the friction roller. In addition, the present invention can also be applied to a conveyance path in which the inclination of the downward inclined path portion is relatively large.

Furthermore, the direction in which the friction roller of the braking means approaches the friction target surface around a position downstream of the rotation center of the friction roller and separated from the friction target surface to the side where the rotation center is positioned. It is preferable that it is configured to be swingable.
According to such a configuration, since the biting force acts and the pressing force of the friction roller increases, it becomes easier to secure the required pressing force of the friction roller, and the conveyance path has a larger inclination of the downward inclined path portion. It can also be applied to.

Furthermore, it is preferable that the braking device has a characteristic that the braking torque increases as the rotational speed increases.
According to such a configuration, even if the weight of the conveyed object fluctuates, it is possible to reduce fluctuations in the speed of the carrier that self-travels due to gravity in the downward inclined path part.

  As described above, according to the conveyor apparatus according to the present invention, (a) the carrier is driven by gravity in the downward inclined path portion, and therefore, since there is no drive device, cost reduction and space saving are achieved. In addition, the power consumption is reduced, and (a) the downward sloping path portion is configured to brake the friction surface that is continuously formed over substantially the entire length in the carrier transport direction. Since the carrier does not move while repeating the above, there is no inconvenience that it is difficult to maintain the constant speed of the carrier due to the deceleration operation time being insufficient in the downward inclined path part having a steep angle, and (c) the carrier in the downward inclined path part. The structure of the carrier can be simplified by pressing the friction member against the friction surface driven by the friction roller type driving device and braking the friction member. ) Conveying including the downward inclined path portion by pushing the carrier into the braking means of the inclined path portion by the driving roller of the high position horizontal path portion and pulling out the carrier from the braking means of the inclined path portion by the driving roller of the low position horizontal path portion. In the route, there are remarkable effects such as that the carrier can be smoothly and reliably transported with a simple configuration.

It is a front view which shows the conveyor apparatus which concerns on embodiment of this invention. It is a front view of a carrier. It is a principal part enlarged front view which shows the state which is pushing the carrier into the braking means of the most upstream position in a downward inclination path | route part, driving the friction surface of a carrier with the drive roller of a high position horizontal path | route part. It is a principal part enlarged front view which shows the state which is conveying the carrier by gravity, braking a carrier with a braking means in a downward inclination path | route part. It is a principal part enlarged front view which shows the state which has pulled out the carrier from the braking means of the most downstream position in a downward inclination path | route part, driving the to-be-rubbed surface of a carrier with the friction roller of a low position horizontal path | route part. It is the schematic of the braking means seen from upper direction perpendicular | vertical to a downward inclination path | route part. It is a general | schematic fragmentary sectional view of the braking means seen from the conveyance direction back. It is explanatory drawing of the specifications around a friction roller.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste.
Further, in this specification, along the carrier transport direction E, the front side (downstream side) is the front side, the rear side (upstream side) is the rear side, and the left and right sides are frontward, as viewed from the left. The figure is a front view.

As shown in the front view of FIG. 1, the conveyor device according to the embodiment of the present invention causes the carriers 1, 1,. The carriers 1, 1,... Are moved along the transport path A including the downward inclined path portion B.
In the downward inclined path portion B, the friction roller 2 that is a friction member of the non-powered braking means B1 and B2 is pressed against the friction target surface 1A continuous over substantially the entire length in the conveying direction E of the carrier 1, so that the carrier 1 is braked. Self-propelled by gravity while receiving braking force by means B1 and B2.
Further, in the transport path other than the downward inclined path part B, in the configuration of FIG. 1, at least the high position horizontal path part C1 upstream of the downward inclined path part B and the low position horizontal path downstream of the downward inclined path B. In the part C2, since the driving roller 7 is pressed against the friction surface 1A, the carrier 1 is conveyed by the friction roller type driving devices D1 and D2 .

As shown in the front view of FIG. 2, the carrier 1 includes front and rear load trolleys 13 and 14 to which a load receiving body 20 that supports a conveyed object is attached between a front end trolley 11 and a rear end trolley 12. The front end trolley 11 and the front load trolley 13 are connected via the front connecting rod 15, and the front load trolley 13 and the rear load trolley 14 are connected via the intermediate connecting rod 17, and the rear load trolley 14 and the rear end trolley 12 are connected. Are connected via a rear connecting rod 16.
Here, the rear end portion of the front end trolley 11 and the front end portion of the front connecting rod 15 are rotatable about the vertical shaft 11A and the horizontal shaft 15A so that the front end portion of the front load trolley 13 and the rear end of the front connecting rod 15 can be rotated. The portion is rotatable about the vertical shaft 13A and the horizontal shaft 15B, and the front end portion of the rear end trolley 12 and the front end portion of the rear connecting rod 16 are rotatable about the vertical shaft 12A and the horizontal shaft 16B. The rear end portion of the rear load trolley 14 and the front end portion of the rear connecting rod 16 are connected so as to be rotatable around the vertical shaft 14B and the horizontal shaft 16A.
Further, the rear end portion of the front load trolley 13 and the front end portion of the intermediate connecting rod 17 are rotatable about the vertical shaft 13B and the horizontal shaft 17A, so that the front end portion of the rear load trolley 14 and the rear end of the intermediate connecting rod 17 are provided. The portion is connected to be rotatable around the vertical shaft 14A and the horizontal shaft 17B, and the intermediate portion of the intermediate connecting rod 17 is configured to be extendable and retractable so that smooth travel of the curved path is possible.

The trolleys 11, 12,... Of the carrier 1 and the left and right side surfaces of the connecting rods 15, 16,... Are rubbed surfaces 1A, 1B (see also FIGS. 6 and 7). It is formed so as to be continuous over substantially the entire length in one transport direction E.
Depending on the configuration, the rubbed surface can be the trolley of the carrier 1 and the upper or lower surface of the connecting rod, that is, the outer surface of the trolley and the connecting rod can be the rubbed surface.
Further, the configurations of the trolleys 11, 12,... And the connecting rods 15, 16,... Constituting the carrier 1 are not limited to the present embodiment, and a connecting rod is provided between a plurality of trolleys separated in the transport direction E. As long as it is connected in a rotatable manner.
, And side rollers 19, 19,... Are attached to the trolleys 11 to 14, and left and right fixed to yokes 9, 9,. Since the side rollers 19, 19,... Are in contact with the raised portions of the upper guide rails 10 and 10 (see FIG. 7), they are prevented from shaking in the left-right direction. Further, since the traveling wheels 18, 18,... Engage with the U-shaped openings of the guide rails 10, 10 (see FIG. 7), the guide rails 10, laid along the conveyance path A shown in FIG. The trolleys 11 to 14 shown in FIG.
With such a configuration, the carrier 1 is inclined downward along the transport path A (guide rails 10 and 10) in a state where the object to be transported having a relatively large outer shape and weight such as an automobile is supported by the load receiver 20. Along with the path part B, the high position horizontal path part C1 and the low position horizontal path part C2, it is possible to move stably and reliably along the horizontal curved path, the upward inclined path part and the like.

As shown in the enlarged front view of the main part of FIG. 3, the carrier 1 is driven on the friction surfaces 1A and 1B by the driving roller 7 driven by the gear motor 8 of the friction roller type driving device D1 of the high position horizontal path C1. In this state, it is pushed into the braking means B1 at the most upstream position in the downward inclined path portion B.
Next, as shown in the enlarged front view of the main part of FIG. 4, the carrier 1 is subjected to a braking force because the friction rollers 2, 2,... Self-propelled in the downward sloping path part B by gravity.

Here, the two braking means B1 and B2 are installed at an interval shorter than the entire length in the transport direction E of the carrier 1, and the distance of the downward inclined path portion B is longer than the entire length in the transport direction E of the carrier 1. Are installed at three or more intervals shorter than the entire length in the conveying direction E of the carrier 1.
Further, as shown in the enlarged front view of the main part of FIG. 5, before the carrier 1 passes through the braking means B2 at the most downstream position in the downward inclined path part B, the friction roller type drive of the low position horizontal path part C2 is performed. In a state in which the friction surfaces 1A and 1B are driven by the driving roller 7 driven by the gear motor 8 of the device D2, it is pulled out from the braking means B2 at the most downstream position in the downward inclined path portion B.

Thus, the carrier is transferred to the braking means B1 at the most upstream position in the downward inclined path B while driving the friction surfaces 1A and 1B by the driving roller 7 (friction roller type driving device D1) of the high position horizontal path C1. 1, while driving the friction surfaces 1A and 1B by the driving roller 7 (friction roller type driving device D2) of the low-position horizontal path portion C2, the carrier from the braking means B2 at the most downstream position in the downward inclined path portion B 1 is pulled out, the carrier 1 can be smoothly and reliably transported with a simple configuration in the transport path A including the downward inclined path portion B.
Further, the braking means B1, B2 are installed at intervals shorter than the entire length in the conveying direction E of the carrier 1, that is, a plurality of friction rollers 2, 2,... Are installed at intervals shorter than the entire length in the conveying direction E of the carrier 1. Since the pressing force per friction roller is small, wear of the friction rollers 2, 2,... And damage to the carrier 1 are unlikely to occur, and a large pressing force is required at a steep slope. Also, the carrier 1 can be reliably conveyed while being braked by the plurality of friction rollers 2, 2,.

Next, a configuration example of the braking means B1 and B2 will be described.
As shown in a schematic view seen from above perpendicular to the downward inclined path B in FIG. 6 and a schematic partial sectional view seen from the rear in the conveying direction E in FIG. 7, the braking means B1 and B2 are a pair of left and right friction rollers 2. , 2, ie, the friction roller 2 on the left side of the friction surface 1A and the friction roller 2 on the right side of the friction surface 1B are arranged so as to sandwich the trolleys 11 to 14 or the connecting rods 15 to 17 from both sides in the left-right direction. In addition to the pair of left and right friction rollers 2, a pair of left and right friction rollers 2, 2 configured in the same manner and spaced apart in the transport direction E are further provided. However, when the inclination angle of the downward inclination path portion B is small and the braking force necessary to maintain the carrier 1 at a constant speed is small, only the pair of left and right friction rollers 2 and 2 are disposed and similarly configured. Thus, the pair of left and right friction rollers 2, 2 separated in the transport direction E may not be further provided.
Further, since the output shaft of the braking device 3 is coupled to the rotation center 2A of the friction roller 2, a braking torque is applied around the rotation center 2A.
Further, the braking device 3 is fixed to the bracket 4, and the bracket 4 is urged by a compression coil spring 6 that is urging means. Press contacted to 1A or 1B.
One of the pair of left and right friction rollers 2 and 2 sandwiching the trolleys 11 to 14 or the connecting rods 15 to 17 from both sides in the left and right direction may be a guide roller that is not connected to the braking device 3.

As described above, the friction members of the braking means B1, B2 are the friction rollers 2, 2,..., And the braking devices 3, 3,. By applying a braking torque to the friction rollers 2, 2,..., Which are friction members, it is possible to suppress wear of the friction surfaces 1A, 1B and the friction members of the carrier 1 due to sliding.
Further, since the friction rollers 2, 2 or the friction roller 2 and the guide roller of the braking means B1, B2 are provided so as to sandwich the trolleys 11-14 or the connecting rods 15-17, the pressing force of the friction rollers 2, 2 is reduced. Even if it is increased, since the bending force acting on the connecting rods 15 to 17 and the force acting on the side rollers 19, 19,... Of the trolleys 11 to 14 are small, it is easy to ensure the required pressing force of the friction rollers 2, 2,. In addition, the present invention can be applied to the conveyance path A in which the inclination of the downward inclined path portion B is relatively large.

The braking device 3 has a characteristic that the braking torque increases as the rotational speed increases. For example, the braking device 3 includes a combination of a centrifugal brake 3A and a planetary gear type speed reducer 3B. The drive shaft of the brake 3A is connected to the input shaft of the speed reducer 3B, and the output shaft of the speed reducer 3B is connected to the friction roller 2.
The centrifugal brake 3A does not generate braking torque when the rotational speed (rotational speed) of the drive shaft is small, and when the rotational speed of the drive shaft exceeds a predetermined value, the brake shoe raised by the centrifugal force is pressed against the lining to perform braking. The torque is generated, and as the rotational speed of the drive shaft increases, a larger braking torque (braking torque proportional to the square of the rotational speed) is generated. When the rotational speed of the drive shaft decreases, the brake shoe Return to a state separated from the lining (a state in which no braking torque is generated).

As shown in FIG. 6, the friction roller 2 of the braking means B1 and B2 is located around a position that is downstream of the rotation center 2A of the friction roller 2 and separated from the friction surface 1A, 1B to the side where the rotation center 2A is located. It is configured to be swingable in the direction approaching the friction surfaces 1A and 1B (around the support shaft 5).
Hereinafter, features of such a configuration will be described.
In order to apply the braking torque by the friction roller 2 of the braking means B1, B2 to the carrier 1 from the friction surfaces 1A, 1B, it is necessary to ensure the required frictional force.
That is, if the required friction force cannot be secured, the friction roller 2 and the friction surfaces 1A and 1B will slip even if the braking means B1 and B2 have the required braking torque.
In order to obtain this required friction force, the friction roller 2 is pressed against the friction surfaces 1A and 1B by the elastic biasing force of the compression coil spring 6, for example.
Referring to the explanatory diagram of the specifications around the friction roller in FIG. 8, the equation (1) is obtained from the balance condition of the moment around the support shaft 5.

                      P ・ L1 + F ・ L2-N ・ L3 = 0 (1)

Here, N is the pressing reaction force (vertical drag force) of the friction roller 2, F is the friction force, and P is the urging force of the compression coil spring 6.
When Expression (1) is solved for the pressing reaction force N of the friction roller 2, Expression (2) is obtained.

                      N = (P · L1 + F · L2) / L3 (2)

From the equation (2), it is understood that F · L2 / L3 due to the frictional force F is added to P · L1 / L3 due to the set elastic biasing force of the spring 6 as the pressing reaction force N of the friction roller 2.
Therefore, F · L2 / L3 acting as a biting force can be added to the pressing reaction force due to the elastic biasing force of the compression coil spring 6 to obtain the required frictional force.
Therefore, such a biting force acts to increase the pressing force of the friction roller 2, that is, the pressing reaction force N, so that the required pressing force of the friction roller 2 can be more easily secured and the downward inclined path portion B can be secured. The present invention can also be applied to the conveyance path A having a larger inclination.

According to the configuration of the conveyor device as described above, the carrier 1 is self-propelled by gravity in the downward inclined path portion B, and therefore there is no drive device, so a large-scale device such as a power-and-free trolley conveyor. Therefore, cost reduction and space saving can be achieved.
Further, in the downward inclined path portion B, the friction surfaces 1A and 1B formed continuously over substantially the entire length in the conveying direction E of the carrier 1 are braked by the braking means B1 and B2, so that the acceleration operation and the deceleration are performed. Since the carrier does not move while repeating the operation, there is no inconvenience that it is difficult to maintain a constant speed of the carrier due to insufficient deceleration operation time in the downward inclined path portion having a steep angle.
Further, in the downward inclined path portion B, the structure of the carrier 1 can be simplified by braking by applying friction members to the friction surfaces 1A and 1B driven by the friction roller type driving devices D1 and D2 of the carrier 1. .
Furthermore, since the braking devices 3, 3,... Of the braking means B1, B2 have a characteristic that the braking torque increases as the rotational speed increases, even if the weight of the conveyed object varies, the braking device Variations in the speed of the carrier 1 that is self-propelled by gravity in the path portion B can be reduced.

A Transport path B Down-tilt path parts B1, B2 Braking means C1 High position horizontal path part C2 Low position horizontal path parts D1, D2 Friction roller type driving device E Transport direction F Friction force μ Friction coefficient N Friction roller pressing reaction force ( Vertical drag)
P Energizing force 1 Carrier 1A, 1B Friction surface 2 Friction roller (friction member)
2A Rotation center 3 Braking device 3A Centrifugal brake 3B Reducer 4 Bracket 5 Support shaft 6 Compression coil spring (biasing means)
7 Driving roller 8 Gear motor 9 Yoke 10 Guide rail 11 Front end trolley 11A Vertical shaft 12 Rear end trolley 12A Vertical shaft 13, 14 Load trolley 13A, 13B Vertical shaft 14A, 14B Vertical shaft 15 Front connecting rod 15A, 15B Horizontal shaft 16 Rear connecting Rods 16A and 16B Horizontal shaft 17 Intermediate connecting rods 17A and 17B Horizontal shaft 18 Traveling wheel 19 Side roller 20 Load receiving body

Claims (4)

A carrier device that moves the carrier along a conveyance path including the downward inclined path part, wherein the carrier is caused to move by gravity in a downward inclined path part that does not store the carrier,
The carrier is movable while being guided by guide rails installed along the conveyance path, and is formed by connecting a plurality of trolleys spaced apart in the conveyance direction so as to be rotatable by a connecting rod.
On the outer surface of the trolley and the connecting rod, a surface to be rubbed is formed continuously over substantially the entire length in the carrier transport direction,
In the downward inclined path portion, a friction roller is caused to act on the friction surface, and the carrier is caused to self-run by gravity while being braked by a non-powered braking means formed by connecting a braking device to the friction roller ,
A plurality of friction rollers of the braking means are installed at intervals shorter than the overall length of the carrier in the conveyance direction,
In the conveying path other than the downlink inclined path section, the lower position the horizontal path section downstream of the upstream side of the high position the horizontal path section and the downlink inclined path than the downlink inclined path section, the driving roller to the target friction surface driving the carrier by the power while pressed against,
The distance between the driving roller of the high position horizontal path portion and the friction roller of the braking means at the most upstream position in the descending inclined path portion is shorter than the total length in the conveyance direction of the carrier. , While driving the rubbing surface by the drive roller, the carrier is pushed into the braking means at the most upstream position in the downward inclined path portion,
The distance between the driving roller of the low position horizontal path portion and the friction roller of the braking means at the most downstream position in the descending inclined path portion is shorter than the total length of the carrier in the transport direction, and in the low position horizontal path portion, And pulling out the carrier from the braking means at the most downstream position in the descending inclined path portion while driving the friction surface by the drive roller.
A conveyor device characterized by that. Wherein with friction rollers of the braking means so as to sandwich the trolley or the connecting rod, the friction roller or the braking device comprising a guide roller which is not connected to claim 1 conveyor device according to the braking means. The friction roller of the braking means swings in a direction approaching the friction surface around a position downstream of the rotation center of the friction roller and spaced apart from the friction surface toward the side where the rotation center is located. The conveyor apparatus of Claim 1 or 2 comprised so that it is possible. The conveyor device according to any one of claims 1 to 3 , wherein the braking device has a characteristic that braking torque increases as the rotational speed increases.

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