JPH0621620Y2 - Jig pallet trolley carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to, for example, a jig pallet truck carrier device for carrying a vehicle body at regular intervals, and more particularly to a carrier device having a simplified carrier mechanism. .

[Conventional technology]

In a body welding line in an automobile production factory, welding work is different depending on each process, and the body welded in the previous process is transferred to a subsequent process by a transfer device and is subjected to predetermined welding. Then, the body welded in the subsequent step is further conveyed to the next step by the conveying device and is subjected to predetermined welding. In this way, when the work in each process is completed, the body is carried to the next process by the carrying device by the preset pitch, and the predetermined work is performed.

Conventionally, there are two methods of carrying the body, and one of them is a method of sequentially carrying the body in a batch by a shuttle transfer provided on an ascending / descending device by a link mechanism or the like. The other is a method in which a welding jig required for assembly is placed on a dolly and the dolly is moved by a drive transfer device while a body is placed on the dolly.

In the former method, the drive transfer device is lifted up to take out and transport the body stored in the jig, then the shuttle bar is transported forward, and the body lifted down in the next process is loaded into the jig. It is necessary to pay. In addition, a mechanism for lifting up and down the weight of the body plus the weight of the drive transfer device is required for each process, and the time for lifting up and down is to be assembled. I was shortening the time.

On the other hand, in the latter method, the jig pallet truck is placed on the rail tracks provided on both sides of the drive transfer device, and the shuttle bar for transporting the jig pallet truck can be moved forward and backward horizontally. As compared with the former method, a mechanism for lifting up and down the body and the drive transfer device becomes unnecessary. Moreover, since the time required for lift-up and lift-down is not required, the effective time for assembling can be increased, and the takt time for assembling one unit with the body can be shortened accordingly. It was

However, in the latter method, some sort of connecting device is required between the shuttle bar of the drive transfer device and the jig pallet carriage when the jig pallet carriage is transported.

FIG. 4 shows an example of a structure for connecting the shuttle bar of the transfer and the jig pallet truck. In the figure, reference numeral 1 denotes a jig pallet trolley on which a body (product) is mounted. The jig pallet trolley 1 is provided with an air cylinder 3 via a support bracket 2, and a rod of the air cylinder 3 is provided with a rod. Is provided with a conveying claw 4. The transfer claw 4 is slidably held by a bush 5 attached to the frame of the jig pallet truck 1. Shuttle bar 6
A transfer claw receiving block 7 is attached to the transfer claw receiving block 7, and the transfer claw 4 driven by the air cylinder 3 is engaged with the transfer claw receiving block 7 when the jig pallet carriage 1 moves. .

FIG. 5 shows another example of the structure for connecting the shuttle bar of the transfer and the jig pallet truck. 11 in the figure
Shows a jig pallet truck, and a jig pallet truck 11
A shuttle bar 12 is located below. A transportation claw 14 is attached to the shuttle bar 12 via a rotation support bracket 13. This transfer claw 14 is a jig pallet truck
It is engageable with a coupling hole 15 formed in the frame of 11. Air cylinders 16 and 17 for engaging or disengaging the transfer claw 14 with the coupling hole 15 are provided in each process. Each air cylinder 16, 17 has a shuttle bar 12
Are fixed to support brackets 18 and 19 arranged on the left and right sides of, respectively.

As described above, in the method of transferring the body by the jig pallet truck, it is not necessary to move the body up and down, and therefore, the takt time of the production line can be shortened as compared with the method of transferring the bodies in a batch.

[Problems to be solved by the device]

However, there is a problem left in the transport apparatus shown in FIGS. 4 and 5. That is, both devices are indispensable for pneumatic equipment around the cylinder device, electrical equipment such as LS (limit switch) for confirming the raising and lowering of the transfer claw, and a control device for controlling each equipment. Yes, in the former case, it was necessary for all steps, and in the latter case, it was necessary for all jig pallet trucks. Further, in these devices, since the cylinders operate individually and the signals from the LS or the like at the operation end thereof are also individually received, the drive transfer is activated in the slowest step of the cylinder operation itself or in the recovery. There was a problem in that the effective pallet truck would be dominated by the pallet truck, and the effective actual work time that could be used for body assembly would be short. Furthermore, since a large number of air and electric devices are controlled, there is a problem that it takes a lot of time to recover from a failure.

The present invention has been made in view of the above points, and an object thereof is to provide a jig pallet trolley transfer device capable of greatly simplifying the mechanism without deteriorating the conventional function.

[Means for Solving the Problems]

A jig pallet trolley transfer device according to the present invention which meets this object includes a plurality of transfer shuttles movably supported on rails, a rotary bar rotatably supported on the shuttles, and a rotary bar. Traveling drive means for reciprocating the bar along the rail; a conveying pawl attached to the rotary bar and engageable with a jig pallet trolley on which a product is mounted by rotation of the rotary bar; An operation bar extending along the rotation bar, and a rotation driving unit fixed to the rail side to rotate the rotation bar by engagement with the operation bar to engage the conveyance pawl with the jig pallet carriage. , Which are equipped with.

[Action]

In the jig pallet truck carrier configured as described above, the plurality of transfer shuttles connected by the rotary bar are reciprocated integrally with the rotary bar by the traveling drive means. Since the rotary bar is rotatable with respect to the shuttle, the rotary bar is mounted on the rotary bar by rotating the operating bar mounted on the rotary bar by a rotation drive means. The transfer claw is engaged with the jig pallet truck. When the rotary bar is moved forward by a predetermined pitch in this state, the jig pallet truck is also moved forward, and the product mounted on the jig pallet is conveyed to the next step.

When the transportation of the jig pallet truck is completed, the rotation driving means is actuated to release the engagement between the jig pallet truck and the transport claw, and the rotary bar is retracted by the traveling driving means and returned to the initial position. Then, the conveying claw and the newly conveyed jig pallet carriage are engaged again by the rotation driving means, and the above-described operation is repeated.

〔Example〕

A preferred embodiment of a jig pallet truck carrier according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. In the figure, 31 indicates a jig pallet truck on which a product (body) not shown is mounted. Jig pallet truck 31
A positioning jig (not shown) for positioning the body at a predetermined position is attached to the. Jig pallet truck 31
Is adapted to travel on a road surface (not shown). The frame of the jig pallet truck 31 has a pair of contact plates.
32 is fixed.

For example, a pit (groove) is provided on the traveling road surface on which the jig pallet truck 31 travels, and two rails 41 extending in the traveling direction of the jig pallet truck 31 are arranged in the groove. Each rail 41 is supported by a rail support 42, and the lower end of the rail support 42 is attached to a base 43 fixed to the bottom surface of the pit. Each rail 41
Are arranged at a predetermined interval, and their cross-sectional shape is circular. The transfer shuttle 44 is located between the rails 41 and 41. The transfer shuttle 44 is a rectangular block body, and rotatable rollers 45 are attached to both side surfaces thereof.
The roller 45 is adapted to roll on each rail 41, and the transfer shuttle 44 is movably supported on the rail 41 by this.

A plurality of transfer shuttles 44 are arranged on the rail 41, and each transfer shuttle 44 has a rotating bar.
It is connected via 47. The rotary bar 47 is made of, for example, a pipe-shaped member. A coupling bracket 49 is held on each transfer shuttle 44 via a bearing 48. The portion of the connecting bracket 49 corresponding to the transfer shuttle 44 is formed of, for example, a round bar, and is rotatable about its axis. That is, the rotating bar 47 is connected to the transfer shuttle 44 via the connecting bracket 49.

Each transfer shuttle integrated with each rotating bar 47
44 is connected to the traveling drive means 51. Travel drive means
51 is for reciprocating each rotary bar 47 and each transfer shuttle 44, the rotary bar 47 located at the end
Is located adjacent to.

A pair of transport claws 61 are attached to each rotary bar 47, and the transport claws 61 are arranged at a predetermined interval.
The transfer claw 61 can be engaged with the contact plate 32 of the jig pallet truck 31. An actuation bar 63 extending along the rotation bar 47 is arranged near the rotation bar 47. The operating bar 63 is
Conveyor claws are made of rod-shaped members with a circular cross section.
In a state in which 61 is positioned above, it is fixed to the rotary bar 47 via a pillar 65 extending obliquely downward.

Below the rotating bar 47, fixed to the rail 41 side, the operating bar
Rotational drive means for rotating the rotary bar 47 by engagement with 47
71 are provided. The rotation driving means 71 includes a slice base 72, a slide block 73, a cam follower (guide roller) 74, and an air cylinder 75. The slice base 72 is a base 43 to which the rail support 42 is attached.
The slide block 73 is slidably provided on the upper portion of the slice base 72 in a direction perpendicular to the axial direction of the rotary bar 47. The slide block 73 has a pair of cam followers 74 with the operating bar 63 held therebetween.
Is installed. The cam follower 74 is rotatably attached to the slide block 73. The slide block 73 is connected to the rod of the air cylinder 75, and the operation bar 63 is moved in the direction perpendicular to the axial direction of the rotary bar 47 while being sandwiched by the pair of cam followers 74. That is, the rotating bar 47 is adapted to rotate by a predetermined angle as the operating bar 63 moves.

Next, the operation of the above-mentioned jig pallet truck transfer device will be described.

When the body mounted on the jig pallet truck 31 is transported to a predetermined process, the body is accurately positioned in the process, and welding is performed at a preset location by a robot or the like. When the welding work in each process is completed, the rotating bar 47 supported by each transfer shuttle 44
Is moved forward by the traveling drive means 51. That is, the rotation bar 47 is pulled by the traveling drive means 51. In this state, the positional relationship between the transfer claw 61 attached to the rotary bar 47 and the contact plate 32 of the jig pallet truck 31 is as shown in FIG. Transporting claw
61 and the contact plate 32 are engaged with each other, and the jig pallet truck 31 moves forward together with the rotating bar 47.

When the traveling drive means 51 moves by a predetermined stroke, the jig pallet truck 31 is conveyed to the next process, and the jig pallet truck 31 is moved.
Is stopped in place. When the jig pallet truck 31 is stopped, the rod of the air cylinder 75 extends and the operating bar 63 held by the pair of cam followers 74 is moved to the air cylinder.
Moved away from 75. Therefore, the rotating bar 47 rotatably supported by each shuttle 44 is
And the contact plate 32 of the jig pallet carriage 31 is rotated.
Is disengaged. When the transport claw 61 and the contact plate 32 are released from each other, the rotary bar 47 supported by each shuttle 44 is released.
Are pushed back by the traveling drive means 51. In this state, since the transfer claw 61 and the contact plate 32 are not engaged with each other, the jig pallet truck 31 does not move as the rotary bar 47 moves.

When the rotation bar 47 is returned to a predetermined position by the traveling drive means 51, the rod of the air cylinder 75 contracts, and the operating bar 63
Are attracted to the air cylinder 75 side. by this,
The rotary bar 47 rotates in the direction of the arrow B, another jig pallet truck 31 and the transfer claw 61 are engaged, and the waiting state is entered.

In this way, the turning force of the air cylinder 75 is transmitted to all the rotary bars 47 connected through the connecting bracket 49, and the single transfer driving means 71 causes the transfer claws 61 and the jig pallet carriage 31 to move. It is possible to engage or disengage.

[Effect of device]

As described above, in the case of the jig pallet truck carrier device according to the present invention, the shuttle movably supported on the rails rotatably supports the rotary bar having the transfer claws, and the rotary bar travels. Since it is made to reciprocate by the drive means and rotated by the rotary drive means, it is not necessary to provide an engaging device with the jig pallet carriage for each process as in the conventional device, and the structure of the device is greatly increased. It can be simplified.

Therefore, the cost of the device can be reduced, and the recovery time when a failure occurs can be significantly shortened by simplifying the configuration. In addition, since it is not necessary to confirm the operation completion for each process using the limit switch, etc.
Lost time is eliminated and the cycle time of transportation can be shortened.

[Brief description of drawings]

1 is a cross-sectional view of a jig pallet truck carrier according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a conventional jig pallet. FIG. 5 is a sectional view showing an example of a carrier device for a carriage, and FIG. 5 is a sectional view showing another example of a carrier device for a conventional jig pallet carriage. 31 …… Jig pallet trolley 41 …… Rail 44 …… Transfer shuttle 47 …… Rotation bar 51 …… Travel drive means 61 …… Transport claw 63 …… Actuation bar 71 …… Rotation drive means

Claims (1)

[Scope of utility model registration request] 1. A plurality of transfer shuttles movably supported on rails, a rotary bar rotatably supported on the shuttles, and a traveling drive for reciprocating the rotary bars along the rails. Means, a conveyance claw that is attached to the rotary bar and is engageable with a jig pallet carriage on which a product is mounted by the rotation of the rotary bar; an operation bar that is attached to the rotary bar and extends along the rotary bar; A jig pallet, which is fixed to the rail side and rotates the rotary bar by engagement with the actuation bar to engage the conveying claw with the jig pallet carriage. A trolley carrier.