JP2001054835A - Pallet stocker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily take out a machined workpiece from a pallet without being hindered by an upper guide roller or the like after a pallet supporting the machined workpiece is returned into a specified storage part of a pallet storage device. SOLUTION: A machining table 12 of a laser machine for machining a workpiece 16 supported on a pallet 14 is additionally provided with a pallet storage device 24 of a pallet stocker 20. The pallet storage device 24 is provided with two upper and lower stage storage parts 25A, 25B for storing pallets 14A, 14B in upper and lower stages. A first elevating device 28 is provided for elevating the pallet storage device 24 so as to dispose the respective storage parts 25A, 25B into a delivery height position corresponding to the machining table 12. A second elevating device 35 is provided for elevating the pallet 14B stored in the lower stage storage part 25B of the pallet storage device 24, between a workpiece takeout position for taking out the workpiece 16 from the pallet 14B, and a storage position of the pallet 14B stored in the specified storage part 25B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing machine for processing a work supported on a pallet by using a laser beam, and more particularly to a laser processing machine in which a plurality of pallets are on standby. The present invention relates to a pallet stocker for transferring pallets to and from a table.

[0002]

2. Description of the Related Art As a conventional pallet stocker of this type, for example, a pallet stocker having a configuration disclosed in Japanese Patent Application Laid-Open No. 6-198483 is known. In this conventional configuration, a pallet storage device is provided so as to be movable up and down adjacent to a processing table of a laser processing machine. Inside the pallet storage device, two upper and lower storage portions for storing pallets vertically are provided. I have. An elevating device is provided below the pallet storage device, and the pallet storage device is raised and lowered by the elevating device, so that the two upper and lower storage units are respectively disposed at the transfer height positions corresponding to the processing table. ing.

[0003] Then, the pallets stored in the upper and lower storage sections in the pallet storage device are alternately delivered to the processing table, and after the work supported on the pallets is processed, The pallet supporting the processed work is returned to a predetermined storage section in the pallet storage device.
In addition, while the work supported on one of the pallets is being processed, the processed work is removed together with the remaining material from the other pallet returned to the storage unit in the pallet storage device. The removal is performed.

[0004]

As described above, in this conventional pallet stocker, the processed work is taken out from the upper and lower pallets in the pallet storage device, so that the work is taken out and mounted. Work height is not determined. For this reason, when the work is performed manually, the work posture is not constant. further,
When removing the work from the lower pallet,
The wall and the frame around the upper pallet placing section hindered the work. In addition, when the work is taken out from the lower pallet, the pallet guide rollers provided in the upper pallet storage unit similarly hinder the work.

[0005] The present invention has been made by paying attention to such problems existing in the prior art. It is an object of the present invention to provide a pallet stocker that can easily perform a work by keeping a work take-out height from a pallet constant.

[0006]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, according to the first aspect of the present invention, there is provided a pallet storage device provided with upper and lower two-stage storage portions for storing pallets vertically. And a first lifting / lowering device for raising / lowering the pallet storage device so that each storage portion of the pallet storage device is arranged at a transfer height position corresponding to the processing table, and stored in the storage portion of the pallet storage device. A pallet is provided with a second elevating device for raising and lowering the pallet between a work take-out position for taking out a work from the pallet and a storage position stored in a predetermined storage portion. .

Therefore, when a pallet is transferred between the pallet storage device and the processing table, the pallet storage device is raised and lowered by the first lifting device, and one of the storage portions of the pallet storage device is moved. It is arranged at the delivery height position corresponding to the processing table. Therefore, upper and lower 2
Pallets can be transferred from the storage section of the tier onto the processing table alternately, and the work carried in and supported on the pallet can be processed continuously, and the pallet on which the processed work is supported can be stored in the pallet storage device. Can be reliably returned to the predetermined storage section.

Further, when taking out the processed work from the lower pallet returned to the predetermined storage portion of the pallet storage device, when there is an obstacle such as a guide roller for delivering the upper pallet, The pallet is lifted from the storage position of the predetermined storage unit to the work removal position by the second lifting device. Therefore, the processed work can be easily taken out from the lower pallet without being obstructed by obstacles such as guide rollers positioned above.

Further, the pallet is moved up and down by the second elevating device irrespective of the elevating of the pallet storage device, so that the pallet can be arranged at the work take-out position. Therefore, the workpieces can be taken out by individually arranging the pallets stored above and below at the same height, and the taking-out work can be performed easily and efficiently.

According to a second aspect of the present invention, in the pallet stocker according to the first aspect, the second lifting device lifts and lowers the pallet stored in the lower storage portion independently. Is what you do.

Therefore, when taking out the processed work from the pallet stored in the lower storage section, the processed work is not obstructed by a plurality of guide rollers arranged on both sides of the upper storage section. Work can be easily performed.

According to a third aspect of the present invention, there is provided a pallet stocker according to the first or second aspect, wherein
Guide rollers for guiding the transfer of the pallet to and from the processing table are provided on both sides of the storage section of the tier, and the width of the guide roller in the storage section of the upper tier is set in the width direction.
The width of the pallet in the lower storage section is wider than the width of the pallet.

Therefore, when the pallet stored in the lower storage section supports the processed work and is raised to the work take-out position by the second lifting / lowering device, it interferes with the guide rollers in the upper storage section. It is possible to raise to the work take-out height without performing.

According to a fourth aspect of the present invention, in the pallet stocker according to the third aspect, the width of the pallet stored in the upper storage section is wider than the width of the pallet stored in the lower storage section. It is characterized by the following.

Accordingly, the pallets having different widths can be securely stored and supported in the upper and lower storage sections, and
The pallets stored in the lower storage section can be easily raised and lowered without interfering with the guide rollers in the upper storage section.

According to a fifth aspect of the present invention, in the pallet stocker according to any one of the first to fourth aspects,
On the side of the processing table, a delivery device for delivering a pallet for delivering a pallet including a pair of sprockets and an endless chain mounted between the two sprockets is provided, and the pallet and the chain are provided. When the chain is rotated via the sprocket by the engagement of the hook provided on one of the above and the pin provided on the other, the pallet is transferred between the pallet storage device and the processing table. It is characterized by having made it.

Therefore, the structure of the transfer device is simple, and the operation of the transfer device allows the pallet to be reliably transferred between the pallet storage device and the processing table.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a laser processing machine 11 is equipped with a processing table 12, and a pallet 1 is placed on a plurality of support rollers 13 provided thereon.
4 are mounted so that they can be carried in and out. A manipulator 15 is provided above the processing table 12, and a work 16 is supplied and supported on the pallet 14 by the manipulator 15.

A column 1 is provided on the side of the processing table 12.
7 is erected, and a support arm 18 is protruded from a side portion thereof. The support arm 18 has the manipulator 15
Are arranged. The laser processing head 19 disposed on the bed 10 is supported so as to be movable in the X and Y directions, and is arranged to face a predetermined processing position on the work 16 supported by the pallet 14. In this state, the laser beam is irradiated from the laser processing head 19 to the processing position of the work 16, whereby the work 16 is subjected to processing such as cutting.

A pallet stocker 20 is disposed adjacent to the side of the processing table 12.
At 0, a plurality of pallets 14 are stored in a standby state so that they can be transferred to and from the processing table 12. Then, an empty pallet 14 on which the work 16 accommodated in the pallet stocker 20 is not mounted is carried into the processing table 12, and the pallet 14 supporting the processed work 16 is moved from the processing table 12 to the pallet stocker. 20
Is to be returned to.

Next, the configuration of the pallet stocker 20 will be described in detail. As shown in FIGS. 1 to 4, a base 23 is provided on a side portion of the processing table 12, and a pallet storage device 24 is supported on the upper portion so as to be able to move up and down. An upper storage section 25A and a lower storage section 25B are provided in the pallet storage device 24, and these storage sections 25A, 25A,
The pallet 14 is accommodated in the upper and lower tiers 25B.

That is, a plurality of side guide rollers 26A and lower guide rollers 2 are provided on both sides of the upper storage section 25A.
7A are arranged at predetermined intervals. The guide rollers 26A and 27A store and support the upper pallet 14A at a predetermined position in the upper storage section 25A, and guide the delivery of the upper pallet 14A between the upper storage section 25A and the processing table 12. It has become.

On both sides of the lower storage section 25B,
A plurality of side guide rollers 26B and a lower guide roller 27B
Are arranged at predetermined intervals. The lower pallet 14B is stored and supported at a predetermined position in the lower storage section 25B by these guide rollers 26B and 27B.
And the delivery of the lower pallet 14B between the pallets 14B and 14B.

As shown in FIG. 4, the upper storage section 25A
The widthwise interval S1 between the lower guide rollers 27A arranged on both sides of the lower storage portion 25B is wider than the widthwise interval S2 between the lower guide rollers 27B arranged on both sides of the lower storage portion 25B. The width W1 of the upper pallet 14A stored in the upper storage section 25A is equal to the width W1 of the lower storage section 25B.
Is formed so as to be wider than the width W2 of the lower pallet 14B stored in the lower pallet 14B. And the upper storage section 25A
In the width direction S1 between the lower guide rollers 27A,
The lower pallet 14B is configured to be wider than the width W2.

As shown in FIGS. 1, 2 and 4, on the base 23, a first elevating device 28 for elevating the pallet storage device 24 is provided. Then, the pallet storage device 24 is moved up and down by the first lifting device 28 to two upper and lower positions, and the lower storage portion 25B and the upper storage portion 25A of the pallet storage device 24 are moved to the processing table 12.
Are arranged at the corresponding transfer height positions.

That is, a pair of rotating shafts 29 are rotatably supported on the base 23 via the support block 30. Rotation levers 31 are respectively attached to both ends of each rotation shaft 29, and one ends of the rotation levers 31 are connected to the pallet storage device 24 via connection plates 32. A pair of hydraulic cylinders 33 are provided on the base 23, and their piston rods 33 a are connected to the other ends of the respective rotating levers 31 via connecting rods 34.

When the two hydraulic cylinders 33 are operated to protrude, as shown by solid lines in FIGS. 1 and 2, the respective rotating levers 31 are rotated counterclockwise, and the pallet storage device 24 is moved to the lower position. It is lowered, and the upper storage section 25 </ b> A is arranged at the transfer height position corresponding to the processing table 12. On the other hand, when the two hydraulic cylinders 33 are immersed, as shown by chain lines in FIGS.
1 is rotated clockwise, the pallet storage device 24 is raised to the upper position, and the lower storage portion 25B is
2, and is arranged at a delivery height position corresponding to 2.

As shown in FIGS. 1 to 4, on the base 23, a second lifting device 35 for independently lifting and lowering the lower pallet 14B stored in the lower storage portion 25B of the pallet storage device 24. Are arranged. The second lifting device 35 includes a pantograph mechanism 36 and a hydraulic cylinder 37 for expanding and contracting the pantograph mechanism 36.

After the lower pallet 14B is returned from the processing table 12 to the lower storage portion 25B, and when the upper pallet 14A is transferred to the processing table 12,
When the processed work 16 is taken out from the lower pallet 14B, the pantograph mechanism 36 is extended by the projecting operation of the hydraulic cylinder 37, and the lower pallet 14B is stored between the guide rollers 26B, 27B of the lower storage section 25B. It is lifted independently from the supported storage position. Thus, the lower pallet 14B is arranged at a position corresponding to the upper storage section 25A, that is, at a work take-out position for taking out the processed work 16 from the pallet 14B.

As shown in FIGS. 5 and 6, a transfer device 38 for transferring pallets 14A and 14B between the pallet storage device 24 and the processing table 12 is provided on the side of the processing table 12. Has been established. The transfer device 38 includes a pair of sprockets 39 and 40 arranged at an interval, an endless chain 41 mounted between the sprockets 39 and 40, and a motor 42 connected to one of the sprockets 39. It is composed of
A hook 43 is provided at the end of each of the pallets 14A and 14B.
Each of the chains 41 is provided with a pin 44 so as to be able to engage and disengage with the hooks 43.

Then, one of the storage sections 25A, 2
5B is arranged at the delivery height position corresponding to the machining table 12 and the sprocket 3 is driven by the motor 42.
The chain 41 is rotated clockwise or counterclockwise in FIG. In this case, chain 4
When the pallet 14 is rotated clockwise in FIG. 5, the pin 44 is moved to the pallet 14 stored in one of the storage portions 25A and 25B.
A, 14B is engaged with the hook 43 on the pallet 1
4A and 14B are transferred from the pallet storage device 24 onto the processing table 12 and moved. On the other hand, when the chain 41 is rotated counterclockwise as shown in FIG.
As shown by the solid line in FIG. 3, the pallets 14A and 14B supporting the processed work 16 are moved from the processing table 12 to a predetermined storage portion in the pallet storage device 24 through the engagement between the pin 44 and the hook 43. 25A and 25B.

Next, the operation of the pallet stocker configured as described above will be described. Now, in FIG. 7A, the upper pallet 14A is delivered to the processing table 12, and
A state is shown in which the work 16 supplied and supported on the pallet 14A is processed. In this case, the pallet storage device 24 of the pallet stocker 20 is lowered, and the upper storage section 25A is arranged at a transfer height position corresponding to the processing table 12. In this state, the transfer device 38 is operated, and the upper pallet 14A supporting the processed work 16 is moved from the processing table 12 to the pallet storage device 24 side, and as shown in FIG. It is returned to the unit 25A.

Thereafter, the pallet storage device 24 is raised by the first lifting device 28, and as shown in FIG.
The lower storage section 25 </ b> B is arranged at a transfer height position corresponding to the processing table 12. In this state, the delivery device 3
8 is operated, and the lower pallet 14B stored in the lower storage section 25B is transferred to the processing table 12. Subsequently, as shown in FIG.
Is operated, and the pallet 1 placed on the processing table 12 is operated.
The work 16 is supplied and supported on 4B. At the same time,
The pallet storage device 24 is lowered by the first lifting / lowering device 28, and the upper storage portion 25 </ b> A is arranged at a transfer height position corresponding to the processing table 12.

Next, as shown in FIG. 7E, the laser processing head 19 moves the processing table 12 in the X direction and the Y direction.
While relatively moving in the direction, the work 16 on the pallet 14B is irradiated with laser light from the laser processing head 19, and the work 16 is subjected to processing such as cutting. Also,
During the processing of the work 16, the processed work 16 is placed on the upper pallet 14A returned to the upper storage section 25A.
Is taken out together with the remaining material. In this case, since there is no obstacle such as a guide roller above the upper pallet 14A, the work 16 can be easily taken out. After the work 16 is taken out, the pallet storage device 24 is raised by the first lifting device 28,
As shown in FIG. 8A, the lower storage section 25B is arranged at a transfer height position corresponding to the processing table 12.

Thereafter, when the processing of the work 16 on the lower pallet 14B is completed, the transfer device 38 is operated, and the lower pallet 14B supporting the processed work 16 is moved from the processing table 12 to the pallet storage device 24.
To the lower storage unit 2 as shown in FIG.
Returned to 5B. Then, the pallet storage device 24 is lowered by the first lifting / lowering device 28, and the upper storage portion 25A is arranged at the transfer height position corresponding to the processing table 12, as shown in FIG.

In this state, the delivery device 38 is operated, and the upper pallet 14 stored in the upper storage section 25A is operated.
A is transferred to the processing table 12. Subsequently, FIG.
As shown in (d), the manipulator 15 is operated, and the work 16 is supplied and supported on the pallet 14A placed on the processing table 12. As shown in FIG. 8E, at the same time, while the laser processing head 19 is relatively moved in the X and Y directions with respect to the processing table 12, the laser light is emitted from the laser processing head 19 to the work 16 on the pallet 14A. The workpiece 16 is irradiated and processed such as cutting. The processed work 1 stored in the lower storage section 25B by the second lifting device 35
The lower pallet 14B for supporting the upper storage unit 25
The workpiece is lifted to the workpiece take-out position corresponding to A.

During the processing of the work 16, the lower pallet 14B, which is elevated to the work take-out position,
The processed work 16 is taken out together with the remaining material. In this case, the lower pallet 14B is raised to the work take-out position corresponding to the upper storage section 25A, and there is no obstacle such as a guide roller above the pallet 14B.
Can be easily taken out.

After the work 16 is taken out,
The lower pallet 14B is lowered from the work take-out position by the second lifting / lowering device 35, and is placed in the lower storage section 25B as shown in FIG. 7A. Thereafter, the above-described operations of FIGS. 7A to 7E and FIGS. 8A to 8E are repeatedly performed, and each of the storage portions 25A, 25A,
25B, the pallets 14A, 1
4B are conveyed alternately and their pallets 14A, 14
Processing is continuously performed on the work 16 carried and supported on B. Then, the processed work 16 is returned to the respective storage sections 25A, 25B of the pallet storage device 24 together with the pallets 14A, 14B, and then arranged at a work take-out position corresponding to the upper storage section 25A, and the pallet 1
It is taken out sequentially from 4A and 14B.

The effects that can be expected from the above embodiment will be described below. In the pallet stocker of this embodiment, a pallet storage device 24 is attached to the processing table 12 of the laser processing machine 11 for processing the work 16 supported on the pallet 14. The pallet storage device 24 is provided with upper and lower two-stage storage sections 25A and 25B for vertically storing the pallets 14A and 14B, respectively. A first elevating device 28 that elevates and lowers the pallet storage device 24 is provided so that each of the storage portions 25A and 25B of the pallet storage device 24 is arranged at a transfer height position corresponding to the processing table 12. The pallet 14B stored in the storage section 25B of the pallet storage device 24 is
A second elevating device 35 is provided to move up and down between a work take-out position for taking out the work 16 from above 4B and a storage position stored in a predetermined storage portion 25B.

Therefore, when the pallets 14A and 14B are transferred between the pallet storage device 24 and the processing table 12, the pallet storage device 24 is raised and lowered by the first lifting device 28, and the pallet storage device is moved. 24 is provided on the machining table 12.
Are arranged at the corresponding transfer height position. Therefore, the pallets 14A and 14B are alternately transferred from the upper and lower two storage sections 25A and 25B onto the processing table 12, and the work 16 carried and supported on the pallets 14A and 14B can be continuously processed. At the same time, the pallets 14A and 14B on which the processed work 16 is supported can be reliably returned to the predetermined storage portions 25A and 25B of the pallet storage device 24.

When taking out the processed work 16 from the pallets 14A, 14B returned to the predetermined storage sections 25A, 25B of the pallet storage device 24, if there is an obstacle such as a guide roller above, Second lifting device 35
Thereby, the pallet 14B is raised from the storage position of the predetermined storage portion 25B to the work take-out position. Therefore, without being obstructed by obstacles such as guide rollers located above,
The processed work 16 can be raised to a position where the processed work 16 can be easily taken out from the pallets 14A and 14B.

Further, when the pallet storage device 24 of the pallets 14A and 14B is lowered by the second lifting device 35, the pallet 14B is arranged alone at the work take-out position in order to raise and lower the lower pallet 14B. Can be. Therefore, even if a pair of pallets 14A and 14B are provided as in the embodiment, those pallets 1
The work can be taken out by arranging the 4A and 14B at the same height, so that the work can be taken out easily and efficiently. Therefore, there is no need for the operator to change the working posture every time the pallets 14A and 14B are different, and work fatigue can be reduced.

In the pallet stocker of this embodiment, the second lifting device 35 lifts and lowers the pallet 14B stored in the lower storage section 25B independently. For this reason, when taking out the processed work 16 from the pallet 14B stored in the lower storage section 25B, the plurality of guide rollers 26A, 27A and the like arranged on both sides of the upper storage section 25A hinder the operation. Thus, the work of taking out the processed work 16 can be easily performed.

In the pallet stocker of this embodiment, the pallets 14A and 14A are provided on both sides of the upper and lower storage sections 25A and 25B between the pallets 14A and 14B, respectively.
Guide rollers 26A, 26 for guiding delivery of B
B, 27A and 27B are provided. The width S1 of the lower guide roller 27A in the upper storage section 25A is equal to the width S1 of the pallet 1 stored in the lower storage section 25B.
It is configured to be wider than the width direction interval W2 of 4B. For this reason, when the upper pallet 14A is moved to the processing table 12 and the pallet 14B stored in the lower storage section 25B supports the processed work 16, the work removal position is set by the second lifting / lowering device 35. At the time of ascending, the possibility of interference with the lower guide roller 27A in the upper storage section 25A can be reliably prevented.

In the pallet stocker of this embodiment, the pallets 14 stored in the upper storage section 25A
The width W1 of A is formed to be wider than the width W2 of the pallet 14B stored in the lower storage section 25B. For this reason, the pallets 14A and 14B having different widths can be reliably stored and supported in the upper and lower two storage sections 25A and 25B, and the pallets 14B stored in the lower storage section 25B can be stored in the upper storage section 25A. It can be easily moved up and down without interfering with the lower guide roller 27A.

In the pallet stocker of this embodiment, a delivery device including a pair of sprockets 39 and 40 and an endless chain 41 mounted between the sprockets 39 and 40 on the side of the processing table 12. 38
Is provided. The sprockets 39, 40 are engaged with the hooks 43 provided on the ends of the pallets 14A, 14B and the pins 44 provided on the chain 41.
The rotation of the chain 41 through the pallet stores the pallet 1 between the pallet storage device 24 and the processing table 12.
Delivery of 4A and 14B is performed.
For this reason, the structure of the delivery device 38 is simple, and the operation of the delivery device 38
A and 14B are stored in the pallet storage device 24 and the processing table 12.
Can be reliably passed between

(Modification) This embodiment can be embodied with the following modifications. In the pallet storage device 24 of the embodiment, when an obstacle exists above both sides of the upper storage portion 25A, both the upper pallet 14A and the lower pallet 14B are moved by the second lifting device 35 to the upper storage portion. It is configured to be raised to a work take-out position above 25A. Therefore, an easy work removal operation can be reliably realized.

Provision of a take-out device for taking out the processed work 16. Therefore, the mounting and unloading of the work 16 can be more easily automated. In the delivery device 38 of the embodiment, the hook 43 is provided on the chain 41 and the pin 44 is provided on the pallets 14A and 14B.

The manipulator 15 of the above embodiment
The work is supplied to the pallets 14A and 14B by the manipulator 15 immediately after the processed work is taken out from the pallets 14A and 14B arranged at the work transfer position. To be configured. In this case, the pallets 14A and 14B can always be arranged at the same height when the work is supplied by the second lifting device 35. Therefore, a large-scale device for moving the manipulator 15 up and down is not required.

In the laser beam machine 11 of the embodiment, the machining table 12 is moved in one of the X direction and the Y direction, and the laser machining head 19 is moved in the other direction.

[Brief description of the drawings]

FIG. 1 is a side view of a laser processing machine provided with a pallet stocker.

FIG. 2 is an enlarged side view showing the pallet stocker of FIG. 1;

FIG. 3 is a plan view of the pallet stocker of FIG. 2;

FIG. 4 is a sectional view of the pallet stocker of FIG. 2;

FIG. 5 is a side view showing a pallet delivery device.

FIG. 6 is a plan view of a main part of the pallet delivery device of FIG. 5;

FIG. 7 is an explanatory diagram showing the first half operation of the pallet stocker of FIG. 1;

FIG. 8 is an explanatory diagram showing the latter half of the operation of the pallet stocker of FIG. 1;

[Explanation of symbols]

11 laser processing machine, 12 processing table, 14 pallet, 14A upper pallet, 14B lower pallet, 16 work, 19 laser processing head, 20 pallet stocker, 23 base, 24 pallet Storage device, 25A: Upper storage unit, 25B: Lower storage unit, 26A
... Side guide rollers of the upper storage section, 26B... Side guide rollers of the lower storage section, 27A... Lower guide rollers of the upper storage section, 27B... Lower guide rollers of the lower storage section,.
Lifting device, 31 ... rotating lever, 33 ... hydraulic cylinder,
35: second lifting device, 36: pantograph mechanism, 37
... Hydraulic cylinder, 38 ... Transfer device, 39,40 ... Sprocket, 41 ... Chain, 42 ... Motor, 43 ... Hook, 44 ... Pin, S1 ... Width in the width direction between lower guide rollers of the upper storage section, S2 ... Lower storage Width of the upper pallet, W2: width of the upper pallet, W2: width of the lower pallet.

Claims (5)

[Claims] 1. A pallet stocker which is attached to a processing table of a laser processing machine for processing a work supported on the pallet, makes a plurality of pallets stand by, and enables a pallet to be transferred to and from the processing table. A pallet storage device provided with upper and lower two-stage storage portions for storing the pallets vertically, and a pallet storage device such that each storage portion of the pallet storage device is arranged at a transfer height position corresponding to a processing table. A first lifting device for raising and lowering the pallet, a pallet stored in a storage portion of the pallet storage device, a work take-out position for taking out a work from the pallet, and a storage position stored in a predetermined storage portion. A pallet stocker provided with a second elevating device that moves up and down between the pallets. 2. The pallet stocker according to claim 1, wherein the second lifting device raises and lowers a pallet stored in a lower storage unit. 3. The pallet stocker according to claim 1, wherein guide rollers for guiding the transfer of the pallet to and from the processing table are provided on both sides of the upper and lower storage sections, respectively. A pallet stocker in which the widthwise interval of the guide rollers in the upper storage section is wider than the widthwise interval of the pallets in the lower storage section. 4. The pallet stocker according to claim 3, wherein the width of the pallet stored in the upper storage section is wider than the width of the pallet stored in the lower storage section. 5. The pallet stocker according to claim 1, wherein:
A delivery device for delivering a pallet including a pair of sprockets and an endless chain mounted between the two sprockets is provided, and a hook provided on one of the pallet and the chain and a hook provided on the other are provided. A pallet stocker for transferring a pallet between a pallet storage device and a processing table by rotating a chain via a sprocket by engagement with a pin provided.