JPH08282834A - Pallet circulating device - Google Patents

Abstract

PURPOSE: To provide a work circulating device suitable for continuous work by forming linear feed mechanisms with chains with dogs and crossed feed mechanisms with delivery lift tables with high-speed pull-in conveyors, crossed feed tables with crossed feed rollers, and receive side lift tables. CONSTITUTION: Pallets P on which works are placed are circulated through a first assembly line 1 and a second assembly line 2. Also receive side lift tables 3a and 3b, linear feed lines 4a and 4b, and delivery lift tables 5a and 5b are arranged in the lines 1 and 2. Then crossed feed tables 6a and 6b are provided between the lines 1 and 2. Linear feed mechanisms 7a and 7b comprise chains with dog which are meshed sprockets 9a and 9b. In addition, high-speed pull-in conveyors with dog 17a and 17b are provided on the delivery lift tables 5a and 5b. Crossed feed rollers are arranged on the receive side lift tables 3a and 3b and crossed feed tables 6a and 6b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet transfer device for an assembly line for vehicles and the like, and more particularly to a pallet circulation device for linearly feeding and palletizing a pallet in a plane loop.

[0002]

2. Description of the Related Art As disclosed in Japanese Unexamined Patent Publication No. 3-239662, in a vehicle assembly work line such as a body of a passenger car or a trailer frame, both side surfaces of a pallet on which they are mounted are sandwiched by rotating bodies and the rotating bodies are rotated. A friction method is adopted in which the pallet is fed straight forward by using the frictional force with the pallet.

Further, there is a system in which a pallet is placed on a carriage and moved in order to feed the pallet orthogonally between a plurality of assembly work lines.

[0004]

The above-mentioned friction system requires a large number of pallet driving points, and a large pallet is required for a large and heavy work piece such as a trailer frame. Feeding by friction of large pallets is expensive.

Further, in the orthogonal feed system of pallets by a dedicated carriage between a plurality of assembly work lines, the subsequent pallets are placed on the carriage until the carriages return to the original assembly work line position even if the carriage moves. Therefore, it is not suitable for continuous work.

Therefore, the present invention provides a large-sized and heavy-weight work circulating apparatus suitable for continuous work in an assembly work line.

[0007]

SUMMARY OF THE INVENTION The present invention is a pallet circulating apparatus having a mechanism for feeding a pallet orthogonally between first and second assembly work lines having a mechanism for feeding the pallet in a straight line. Is a chain with a dog that moves forward and backward, and is characterized in that the orthogonal feeding mechanism is composed of a feeding up-and-down table having a high-speed drawing conveyor, an orthogonal feeding table having orthogonal feeding rollers, and a receiving side table.

In the assembly work station for welding or the like, the mechanism for feeding the pallet at a right angle feeds straight feed at a low speed using a chain with a dog, and when the transfer of the pallet is completed, the chain with a dog is returned at a high speed. It is configured to return to the position where the pallet is pushed.

After the completion of one assembly work line, a chain with a dog is provided on the sending-side elevating table for feeding the pallet at a high speed in order to feed the pallet orthogonally and move it to the next assembly work line. The lifting and lowering of the feeding side lifting table consists of slide rollers and cams.
Further, on the pallet feeding / lifting table and the receiving / lifting table, inclined notches for positioning for correcting the position of the lower pallet guide roller are provided in a part of the rail.

[0010]

According to the present invention, when a pallet is linearly fed by a chain with a dog, it can be fed at a fine speed according to the assembling work, and when the dog is returned to the position where the subsequent pallet is pushed, it can be fed at a high speed. Since the pallet is pulled in at a high speed in the orthogonal feed, the pallet can be quickly fed in the orthogonal direction to feed the next pallet, and the line does not stop due to the orthogonal feed.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall view of a pallet circulating apparatus. In this embodiment, the pallet P is constructed so as to circulate in a first assembly work line 1 and a second assembly work line 2. Each of the lines 1 and 2 has a receiving side lifting table 3a, 3
b, straight feed lines 4a and 4b, and feed-side elevating tables 5a and 5b are arranged. Further, orthogonal feed tables 6a and 6b are provided between the lines 1 and 2.

The frame of the body or trailer of the passenger car placed on the pallet P is subjected to the assembly work such as welding at the assembly work stations A to E of the first assembly work line 1 and then to the adjacent second frame. After being orthogonally fed to the assembling work line 2, the assembling work is continued at each of the work stations F to J. After the assembling work is completed, the pallet P which has become empty is orthogonally fed and returned to the first assembling line 1.

2 and 3 show the assembly work lines 1 and 2, respectively.
3 shows mechanisms 7a and 7b for linearly feeding the pallet P.

Mechanisms 7a, 7 for linearly feeding the pallet P
b is a sprocket 9 rotated by motors 8a and 8b.
Chains with dogs 10a and 10 that mesh with a and 9b
It consists of b. The chains 10a and 10b can be smoothly driven by using the conveyor chain 10 with bearing rollers. The dogs 11a and 11b have a well-known structure having a weight 12 in a pendulum type at a lower portion thereof and a stopper 13 for rotating in only one direction.
The pallet P is provided with wheels 15 that travel on the rails 14 of the lines 1 and 2.

As the chains 10a and 10b move, the dogs 11a and 11b move to the frame 16 of the pallet P.
And pushes the pallet P forward. The pallet P is fed at a fine speed (for example, about 250 mm / min) in consideration of the time required for assembly work.

When the dogs 11a and 11b move forward by a predetermined distance and feed the pallet P, the dogs 11a and 11b move backward by the reverse rotation of the motors 8a and 8b. At that time, when the dogs 11a and 11b hit the frame 16 of the subsequent pallet P, they rotate (counterclockwise in the case of the figure), pass under the frame 16, move backward, and pass through the frame 16 at the rear end of the pallet P. , The dogs 11a and 11b rotate (clockwise in the case shown) by the action of the weight 12, abut on the frame 16, and
Again, the pallet P is fed straight forward. Dogs 11a, 1
Since the return of 1b is performed at a high speed, the movement of the pallet P is substantially continuous.

The pallet P that has reached the final station of the first assembly work line 1 is pushed forward and placed on the sending-side elevating table 5a. As shown in FIG.
The lifting table 5a is provided with the above-mentioned dog-attached chain 17a in order to pull the pallet P fed straight forward from the final work station of the first assembly work line 1 into the sending-side lifting table 5a at high speed.

As shown in FIG. 5, the frame 18 of the sending-side elevating table 5a is provided with an inclined notch 20 into which the guide roller 19 of the pallet P falls for positioning the pallet P.

Lifting mechanism 2 for the sending-side lifting table 5a
1 is a cam 22 provided at a plurality of locations on the lower surface of the frame
And a plurality of slide rollers 23 in contact with these cams 22
It consists of. The slide roller 23 is connected by a tie rod 24, and is moved forward and backward by a cylinder 25 connected to the tie rod 24 to move up and down the delivery side elevation table 5a.

An orthogonal feeding table 6a is arranged between the sending-side elevating table 5a and the receiving-side table 3b of the second assembly work line 2. Orthogonal feed rollers 26 are arranged at intervals between the feeding-side elevating table 5a, the receiving-side table 3b of the second assembly work line 2, and the orthogonal feed table 6b. Each motor 27 provided on each table
The pallets P on the sending-side elevating table 5a are sent to the orthogonal sending table 6b by being rotated by a, 27b, and 27c, and further sent to the receiving-side table 3b.

In the frame of the receiving side table 5b,
Similar to the sending-side elevating table 5a, an inclined notch 20 into which the guide roller 19 of the pallet P falls is provided for positioning the pallet P. Further, in order to draw the pallet P into the work station, the above-mentioned chain conveyors 28a and 28b with dogs are provided.

A pallet P is installed in the second assembly work line 2.
A chain conveyor with a dog is provided in order to feed the paper straightly, and its structure and drive mechanism are the same as those of the first work line, and therefore description thereof is omitted.

The pallet P fed straight forward is returned from the last station of the second work line to the receiving side table of the first work line through the sending side elevating table and the orthogonal table.

[0025]

The effects of the present invention are as follows.

(1) According to the present invention, since the conveyor chain with the bearing roller having the dog for the orthogonal feed is used, it is possible to move a work having a large weight and a large size as compared with the conventional friction system.

(2) According to the present invention, since the dog can be quickly returned, the pallet can be fed straight forward almost continuously, and work is not delayed.

(3) According to the present invention, since the rapid pull-in can be applied to the orthogonal feeding, the pallet feeding does not become stagnant due to the orthogonal feeding.

[Brief description of drawings]

FIG. 1 is an overall view of a pallet circulation device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view of the linear feed mechanism of the present invention.

FIG. 5 is an enlarged view of a dog portion of the linear feed mechanism of the present invention.

FIG. 6 is a front view of the lifting table according to the present invention.

FIG. 7 is an enlarged view of a cam portion of the lifting table according to the present invention.

FIG. 8 is an explanatory view of a pallet positioning notch of the lifting table of the present invention.

FIG. 9 is a plan view of a sending-side elevating table, a receiving-side table 3b, and an orthogonal sending table according to the present invention.

[Explanation of symbols]

1 1st assembling work line, 2 2nd assembling work line, 3a, 3b Receiving side lifting table, 4a, 4b
Straight line feed line, 5a, 5b Feeding side elevation table, 6a, 6b Orthogonal feed table, 7a, 7b Mechanism for straight line feed, 8a, 8b Motor, 9
a, 9b Sprockets 9a, 9b, 10a, 10b
Chain conveyor with dog, 10 Conveyor chain with bearing roller, 11 dog, 12 weight, 13 stopper, 14 rail, 15 wheels, 16 frame, 17a, 17b Chain conveyor with dog, 18 frame, 19 guide roller, 20 inclined cutout , 21 lifting mechanism,
22 cams, 23 slide rollers, 24 tie rods, 25 cylinders, 26, orthogonal feed rollers,
27a, 27b, 27c Motor, 28a, 28b Chain conveyor with dog

Claims (2)

[Claims] 1. A pallet circulating apparatus having a mechanism for orthogonally feeding pallets between first and second assembling work lines having a mechanism for linearly feeding the pallet, wherein the linear feeding mechanism is a dog-attached chain that moves forward and backward. A pallet circulating apparatus characterized in that the orthogonal feeding mechanism comprises a feeding lifting table having a high-speed drawing conveyor, an orthogonal feeding table having orthogonal feeding rollers, and a receiving side table. 2. The pallet circulating apparatus according to claim 1, wherein the sending-out lifting table and the receiving-side table are provided with inclined cutouts for positioning guide rollers at the bottom of the pallet.