JPH01236107A - Load transferrer - Google Patents

Abstract

PURPOSE:To give a deflection corrective function to a load transferrer by setting up a pair of taper rollers, having taper tips themselves opposed to each other, in parallel with a plural pair to a center line of the transfer direction and thereby constituting a transfer roller, in the transferrer for a warehouse or the like. CONSTITUTION:Plural pairs of taper rollers 7, 7 having their small diametral sides opposed to each other are set up symmetrically in a center line 6-6 in the transfer direction, thereby forming a transfer roller group. These paired rollers 7, 7 are connected freely at each center part by a universal joint 9, being connected to a drive mechanism, thereby constituting a transfer device 13. Then, one bus bar at the upper side of the taper roller 7 should be set in horizontality or make the roller tip side lower. With this constitution, since a part moves the remoter than a load center line, the speedier, a load is transferred as moving in direction toward the center all the time. Consequently, even if deflection occurs, it converges on the transfer center line 6. Thus, any deflection is automatically controllable.

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) The present invention is directed to transporting goods used in factories and warehouses between carrier vehicles that transport goods and stations that receive the goods. The receiving is related to the transfer equipment used for handing over.

(Prior Art) Recently, automatic guided vehicles have been widely used to transport cargo within various factories and warehouses. This automated guided vehicle moves on its own while being guided along a predetermined route, and either unloads or loads cargo at its destination.

There are various methods for loading and unloading cargo onto the transport vehicle, but in terms of -a, a station is set up adjacent to the travel path of the transport vehicle, and a station is installed between the ground side station and the transport vehicle. Luggage is received and handed over.

In this case, a transfer device is provided at each station and the carrier to mechanically transfer the cargo on the carrier and transfer it to an adjacent station.

As one of the transfer methods, as shown in FIG.
The load on the rollers 3 is transferred, that is, reloaded, from one side to the other by rotating the drive rollers 3 on the transport vehicle side and the station side in the same direction. However, there are cases where positional accuracy is required when changing loads, such as when stacking loads or placing them on a processing table for processing. In such cases, the following problems arise: The stopping position of the conveyance vehicle 1 with respect to the raw material station 2 is determined to be accurate with a special positioning device, but the stopping accuracy is stopped with a considerably large error (on the order of a raccoon dog). In addition to this error in the transport vehicle 1, if the cargo itself is transferred not at a fixed position on the transfer device but swinging from side to side, it will not be possible to meet the above requirements.

This is a vibration that naturally occurs because the load moves on the cylindrical rollers.

In order to ensure that cargo can be transferred without any problems, -
Finally, as shown in FIG. 4, guides 4 are provided on both sides in the transport direction, and at both ends there is a guide entrance/exit portion 5 in which the distance between the guides widens in a trumpet shape toward the tip of the entrance/exit.
has been established. That is, by providing these guides 4.4, the swinging of the cargo to the left and right with respect to the transfer direction during transfer is restricted.

However, when the cargo is transferred directly on the rollers 3 without being placed on a special pallet, the side surface of the cargo and the guide 5 may be difficult to handle due to reasons such as the very complicated side shape of the cargo or the soft material of the side surface. There are cases where the guide 5/ cannot be used because the guides rub against each other and cannot move.

Further, even if the guide 5.5 is provided, if the load is small, swinging within the guide cannot be controlled.

For these reasons, the guide alone is insufficient as a steady rest, and the transfer direction may be affected by the stopping accuracy of the transport vehicle, irregularities on the bottom of the cargo, the height of the transfer surface between the transport vehicle side and the station side, or the roller rotation speed error. For example, when the same package is transferred several times, cumulative errors may occur on the receiving side. In this case, errors in the position of the cargo may cause problems in the subsequent process,
Alternatively, if the receiving side is a transport vehicle, the center of gravity of the load may be biased, causing problems such as affecting the movement of the transport vehicle.

The present invention provides a drive roller type transfer device that does not require a steady guide in the transfer direction for transfer and has a function to correct the deflection even if it occurs. That is.

By arranging a pair of drive rollers parallel to each other symmetrically with respect to the center line in the transport direction of the load, and by increasing the circumferential speed of the rollers outward from the center line side, the load on these drive rollers is On the other hand, the force is always directed towards the center line.

(Substitution) With this configuration, when the tapered roller is driven to rotate, the cargo receives a propulsive force in the transfer direction and a propulsive force in the transfer direction center line commensurate with the difference in circumferential speed of the roller surface, which corrects the deflection by one factor. .

(Example) This will be explained based on FIGS. 1 to 3.

Two truncated conical tapered rollers 7.7 are placed symmetrically with respect to the center line 6 in the transfer direction of the transfer device on the carrier 1, with their tips (rollers with small diameters) 8.8 facing each other. Place multiple pairs in parallel. The rotating shafts of each pair of tapered rollers 7.7 are freely connected at the center by a universal joint 9, and a chain sprocket 10 is attached to the end of the shaft. 7.7 will be transmitted. The chain 12 is engaged with the chain sprocket of each tapered roller, and when the electric motor 11 with a reduction gear rotates, all the tapered rollers are rotated. I'll keep it.

In FIG. 2, the circumferential speed of the rotatably driven tapered roller 7.7 at the contact portion with the load increases as it moves outward from the center line 6.

That is, the roller diameter is small near the center of transport, so the circumferential speed is slow, and at the roller end, the roller diameter is large, so the circumferential speed is fast. Therefore, the further the load on the transfer device 13 goes to the outside of the transfer center of the transfer device 73, the greater the drive force and speed received from the Taber rollers.

Due to this action, the part of the baggage 3 (21) farther from the transfer center moves faster, so the baggage 14 is transferred without moving in the direction toward the transfer center.

Furthermore, even if the load 14 moves in the direction opposite to the initial deflection direction with respect to the transfer center (transfer center line 6) due to this movement, the load will move toward the transfer center due to the above action, and the load will always move toward the transfer center (transfer center line 6). It converges on the transfer center line 6). Note that when the cargo is at the center of transfer, the propulsion speeds on the left and right sides are naturally balanced, so the cargo continues to move on the center line of transfer.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a transfer device having a function of correcting movement errors caused by shake from the transfer direction during transfer.

In other words, since the position of the baggage can be corrected in the direction of the transfer center during the transfer, the positional error of the baggage after transfer can be kept within the allowable value regardless of the stopping accuracy of the transport vehicle or the conditions of the transfer device. For example, even if the same baggage is transferred multiple times, it is possible to prevent positional errors from accumulating due to the transfer. Further, even if the side surface shape of the cargo is complicated or the material is made of a material that does not like guides, it is possible to transfer the cargo without any trouble without providing a guide.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conveyance vehicle according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a diagram showing cargo being transferred on the conveyance vehicle.
FIG. 4 is a plan view of a conventional transport vehicle. ■...Carrier, 2...Station 6...
・Transfer direction center line 7... Taber roller 13... Transfer device 14... Baggage agent burr engineer Yasuo Miyoshi

Claims (1)

[Claims] In a cargo transfer device for loading and unloading cargo onto a transportation vehicle or a conveyor, a plurality of drive rollers each consisting of a pair of tapered rollers with their tapered tips facing each other are arranged in parallel with respect to the center line in the transport direction of the cargo. A cargo transfer device characterized by comprising devices arranged symmetrically on both sides of a center line.