JPH03230832A - Press line - Google Patents

Abstract

PURPOSE:To easily and exactly store and control many pallets by forming a pallet carrying/circulating route between a stack device and a destack device and arranging a stockyard providing a circulating transfer means in the course of this carrying/circulating route. CONSTITUTION:While actual pallets accommodating many blanks by the stack device are carried automatically through a pallet carrying/circulating route 200, they are reserved in a stockyard 140 for the actual pallet. In this stockyard, many blanks are transferred in sequence by the circulating transfer means 141 and the foremost actual pallet is positioned to a position capable of being delivered again to the carrying/circulating route 200 for the actual pallet. The actual pallets taken out to the carrying/circulating route again are fed to the destack device 130. An empty pallet is controlled by the stockyard 150 for the empty pallet and its circulating transfer means 150 in the same way as mentioned above and then carried to the stock device. In this way, the mismatch between working speeds of presses can be dissolved and absorbed and further, the downtimes of the presses can be used effectively for other purposes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a press line configured to hold a large number of pallets and circulate these pallets in sequence.

[Prior art] A press line in which a large number of blanks produced by a punching press are stored in a pallet using a stacking device, and the blanks taken out one by one from this pallet using a day stacking device are supplied to a transfer press. is widely used.

Here, the conventional stacking device is configured to store blanks produced by a punching press one by one on a pallet. Further, pallets are transported from the stacking device to the day stacking device using a manual cart, a roller conveyor, or the like.

[Problems to be Solved by the Invention] However, in today's world where there is a strong demand for improved productivity, cost reduction, automation, etc. of the negative layer, the above-mentioned conventional configuration cannot fully satisfy these demands.

In other words, punching presses can easily achieve higher speeds due to their simple processing, while transfer presses are slower than punching presses due to their high precision and variety of processing.

As a result, a mismatch in processing speed occurs between the punching press and the transfer press, so manually transporting the pallets not only requires too much labor, but also causes empty pallets (blank or loaded). no palette,
It is troublesome to store and manage stacked so-called real pallets (pallets full of blanks, the same applies hereinafter).

In particular, in order to reduce the cost of stages, punching presses tend to produce a plurality of blanks from one coil in one stroke. Therefore, it is required to quickly and accurately stack blanks supplied in large quantities onto each pallet at high speeds, and the distance between blanks produced at the same time (
Since the pitch (pitch) differs depending on the shape of the blank, etc., the punching position of each blank changes with respect to the axis of the punching press, so a press line that automatically stacks multiple blanks on each pallet at the same time has not yet been developed. This seems to be due to the fact that the pallets were transported manually and the storage and management system was not automated.

The purpose of the present invention is to create a press line that can easily store and manage a large number of pallets, which can automate the simultaneous stacking of multiple pallets, eliminate mismatches in production speed between punching presses and transfer presses, etc. It is about providing.

[Means for Solving the Problems] The present invention forms a pallet conveyance circulation system path between a stacking device that accommodates a plurality of blanks in a pallet and a day stacking device that takes out blanks one by one from the pallet. A large number of stockyards for actual pallets are provided in the middle of the real pallet transport system in the pallet transport circulation system, and a large number of stockyards for empty pallets are provided in the middle of the empty pallet transport system. 6 [Function] In the present invention, a stacking device stores a large number of blanks. While the actual pallets are being automatically conveyed through the pallet conveyance circulation system, they are held in a stockyard for actual pallets.In the stockyard, they are sequentially transferred by a circulation transfer means, and the first actual pallet is transferred again for actual pallets. It is positioned at a position where it can be delivered to the conveyance circulation system. The actual pallet taken out to the conveyance circulation system again is sent to the day stacking device.

On the other hand, empty pallets after the day stacking device are also handled by a stockyard for empty pallets and its circulating means.
They are managed in the same way as above, and then transported to the stacking device.6 Therefore, since a large number of actual pallets can be managed and held in an orderly manner, it is possible to absorb production speed mismatches between the punching press and the transfer press, and it is also possible to absorb production speed mismatches between the punching press and the transfer press. The remaining time can be used for other purposes. Furthermore, it becomes possible to construct equipment that stacks a plurality of blanks simultaneously in a stacking device.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

This press line consists of a stacking device 2, as shown in FIG.
A conveyance circulation system path 200 for the pallet 50 is formed between the day stack device 130 and the day stack device 130, and the conveyance circulation system path 200
A stockyard 140 for actual pallets and a stockyard 150 for empty pallets are arranged in the middle of the
It is structured so that 0 can be stored and managed in an orderly manner.

In addition, this also allows the punching press 1 to punch out the two punches at the same time.
In order to automatically stack two blanks W on each pallet 5 at the same time, a makajin circulation moving means 40 is provided before and after passing through the stacking device 20, and on the upstream side of this makajin circulation moving means 40 across the stacking device 20. An empty pallet positioning means 80 is provided and a macazine 3 is provided on the downstream side.
The configuration is such that a machine positioning means 90 for setting 0 at a predetermined position is provided.

That is, since a large number of pallets can be automatically managed, mismatches in production speed between the punching press 1 and the transfer press 2 can be eliminated, and furthermore, parallel stacking operations can be automated as described below. The punching press 1 is designed to simultaneously punch out a plurality of (two in this embodiment) blanks W from a coil material supplied by a coil supply device 3. However, the punching position varies depending on the form, size, etc. of the blank W. In other words, the press axis P shown in FIG.
In contrast, the blank supply axes B1 and 82 are not constant,
Its dimensions Yl, Y2 vary.

Therefore, each pallet 50.50 is filled with blanks W separately.
Stack work requires too much effort, and it is impossible to automate it due to space considerations. Therefore, by introducing a new makajin 30, a plurality of empty pallets 50 are arranged in advance at the above-mentioned interval Y1. It is formed so that a plurality of empty pallets 50 can be simultaneously positioned in the corresponding stacking device 20 by positioning it at Y2 and attaching it to the macajin 30, and positioning the makajin 30 with respect to the plurality of stacking devices 20, that is, the press axis P. ing.

Further, after the stacking operation, the spacing between the plurality of pallets 50.degree. 50 does not matter, because the blanks W are taken out one by one using the stacking device 130 in the transfer press 2.

Therefore, the pallets 50 removed from the machine 30 are transported and circulated separately, and a large amount of actual pallets 50 can be stored.

The constituent elements will be separated below.

First, as shown in FIG. 1, the pallet transport circulation system 200 transports the actual pallet 50 containing a large number of blanks W from the stacking device 20 to the day stacking device 130, and from the day stacking device 130 to the stacking device 20 again. It is something that circulates.

Specifically, a part of the Makazine circulation moving means 40, pallet feeding conveyors 60, 100, and self-propelled trolley II, which will be described in detail later.
O, IIO, pallet cross conveyor 120, etc. are arranged in a rectangular shape in plan as shown in FIG.

Here, as shown in FIG. 1, a stockyard 140 for actual pallets is provided in the middle of the actual pallet conveyance path.

That is, it is a means for holding a large number of actual pallets 50 delivered at position X1 from the self-propelled cart 110 described later.

In this stockyard 140, there are 5 pallets of cabbage on hold.
A conveyor-type circulation transfer means 141 is provided for transferring 0 from position X1 to position X2 by making a U-turn.

On the other hand, a circulation transfer means 151 is also provided in the empty pallet stockyard 150 provided in the middle of the empty pallet transport system in the same manner as described above, and holds a large number of empty pallets 50 and circulates them from position X3 to X4. . Delivery to and from the pallet conveyance circulation system path 200 is carried out using a self-propelled cart 110, which will be described in detail later.
carried out by.

Further, in this embodiment, two sets of circulation transfer means 141 in the stockyard 140 for actual pallets and circulation transfer means 151 in the stockyard 150 for empty pallets are provided on the first floor and the second floor, respectively.

Next, as shown in FIG. 2, the stacking device 20 consists of a table 21 and a lifting means 22, and gradually lowers the blanks W placed on the table 21 while lifting the pallet 50.
In this embodiment, as shown in FIG.
The six stacking devices 20, each of which is arranged in parallel, can be approached and separated from each other in the vertical direction in FIG. 1 via a trolley 23 shown in FIG. In other words, the dimensions (Y1 + Y2) shown in FIG. 1 can be maintained.

The blanks W are supplied from the punching press 1 to the stacking device 20 by the blank supplying device 10 arranged in parallel. As shown in FIG. 2, each blank supply device 10 has a cart 19 and a cart 23, and the interval can be adjusted together with the stack device 20. Each blank feed device 10 transfers the blank W by placing it on the upper surface of a belt 15. It consists of a first magnetic conveyor 11 and a second magnetic conveyor 12 which is disposed vertically overlapping the first magnetic conveyor 11 with a gap S in between. It is assumed that the material is transferred to the stacking device 20 while being adsorbed. Also, the second
The magnetic roller 13 of the magnetic conveyor 12 can be changed in position with respect to the stacking device 20 as shown by the two-dot chain line in FIG. 2 by means of a falling position adjusting means 14 driven by a screw 14a. Therefore, by adjusting the dropping point according to the weight of the blank W, etc., the blank W can be accurately thrown into the blank guide 5.

Next, the magazine 30 is for attaching a plurality (two) of pallets 50, and as shown in FIG.
are provided, and clamp means 34 for clamping the pallet 50 are provided on both sides of the upper part.

The magazine 30 can therefore slide on the rails 39.39. Further, the clamping means 34 can be operated from the outside by operating means 70, as shown in FIGS. 7 and 9. In other words, the pallet 50 can be locked to or released from the magazine 30 by pressing the head of the clamping means 34 with the pressing member 71 that is raised and lowered by the cylinder 72 shown in FIG.

The operating means 70 is located at positions P1 and P2 shown in FIG.
are arranged respectively.

This is because a plurality of pallets 50 are attached to the magazine 30 at the position P1, and the actual pallets 50 are removed from the magazine 30 at the position P2.

Here, the magazine circulation moving means 40 is a means for three-dimensionally circulating the magazine 30 vertically and horizontally, as shown in FIG.
41, 41 and left and right lids 46, 46.

As shown in FIGS. 4 to 7, this horizontal feed mechanism 41 is configured such that a plurality of rollers 42 arranged at a constant pitch can be rotated by a common spline shaft 43, and each roller 42 is a cylinder. At 44a, the lever 44 is formed so as to be able to come into contact with and be separated from the magazine 30 on the rail 39, as shown by the two-dot chain line in FIG.

Therefore, if the spline shaft 43 is rotated by the motor, the roller 42 can move the magazine 30 while the lever 44 is kept in the state shown by the solid line in FIG.

That is, since the magazine 30 conveys a plurality of pallets 50, it is configured to feed the pallets in pitches to improve positioning accuracy. Moreover, the magazine 30 can also be continuously fed.

Moreover, since the driving power is provided externally, the configuration of the magazine 30 is simple.6 On the other hand, the lifter 46 is mounted on the actual pallet
The magazine 30 from which 0 has been removed is lowered to position P.
1, the magazine 30 is raised. Therefore, as is clear from FIG. 3, the magazine 30 circulates vertically in a rectangular magazine circulation path.

Next, as shown in FIGS. 3 and 4, especially FIGS. 8 and 9, the empty pallet positioning means 80 connects the pallet feeding conveyor 60 disposed at position P1 to a pair of link stoppers 81 and 82. It is formed from etc.

That is, the pallet feeding conveyor 60 is formed of a plurality of forward rollers 62 driven by a motor 61 and a plurality of forward and backward rollers 64 driven by a motor 63, as shown in FIG.

Therefore, the empty pallet 50 delivered from the self-propelled cart 110 from the left in FIG. 8 is transferred to the right by the forward rollers 62. Here, if the link stopper 82 is set to the solid line state shown in FIG.
The next empty pallet 50 is advanced until it comes into contact with the rear end of the first empty pallet 50.

Here, the link stopper 81 is moved from the state shown by the two-dot chain line to the state shown by the solid line in FIG. By reversing the rotation, it is moved backward (to the left in FIG. 9) until it comes into contact with the link stopper 81.

Therefore, if the screw 86 is rotated by the motor 85 and the distance between the support members 83.84 of both link stoppers 81.82 is adjusted, the two empty pallets yl-50, 50 can be positioned at the distance (Y1+Y2>). I can do it.

After this pallet positioning, if the lifter 46 is raised as shown in FIG. 9, the magazine 30 or the
As shown in FIG. 9, the two empty pallets 5 are lifted onto the rollers 62 and 64, so that the two empty pallets 5 are placed on the support section 32 shown in FIG.
This means that it is possible to transfer while maintaining the interval (Y1+Y2) adjusted to 0.50. Here, if the operation means 70 of FIG. 9 is operated, the rain sky pallet 50.50
is fixed to the magazine 30 by the claw 34a of the corresponding clamping means 34, as shown in FIG.

On the other hand, the magazine positioning means 90 includes a slider 9 whose position can be adjusted in the horizontal direction (in FIGS. 3 and 5).
1, a stopper 93 rotatably attached to the stopper 93, and a cylinder 92 for rotating the stopper 93. Therefore, I put the stopper 93 on the rail 3 in advance.
9, the center line of the magazine 30 or the axis P
If the magazine 30 is adjusted to coincide with the axis P, the magazine 30 transported by the horizontal feed mechanism 41 can be stopped in line with the axis P. In this case, since the rain-filled pallets 50,50 are already fixed to the magazine 30 with the intervals Y1 and Y2 by the pallet positioning means 80, the winter-air pallets 50 are aligned with the blank supply axes B1 and 82 as shown in FIG. do. That is, it is precisely positioned in the stacking device 20.20.

Thus, the stacked actual pallets 50.50 are removed from the magazine 30 by releasing the crank 1 means 34 by the operating means 70 at position fP2, and are removed from the magazine 30 by the pallet feeding conveyor 100 (this conveyor 100 is at position P).
1), which differs from the one disposed in 1 and has only 162 corresponding to the forward roller 62), and is sent to the carriage 110. On the other hand, the magazine 30 is
At 6 it will be lowered.

Further, the cart 110 carries the actual pallet 50 transferred by the pallet feed conveyor 100 shown in FIG. 4, and moves by itself along the rail 119 shown in FIG. This is a means for conveying the actual pallet 50. The empty pallet 50 is transferred from the pallet cross conveyor 120 to the pallet feed conveyor 6 as shown in the upper part of FIG.
It is transported to the 0 side.

Specifically, as shown in FIG. 10, the pinion 117 that meshes with the rack 118 disposed on the rail 119 side is made self-propelled by controlling the motor 116.
The main body 111 has a horizontal feed l14 which is the same as the horizontal feed mechanism 41 for moving the actual pallet 50 within the main body 111.
1i (roller 112) is provided. therefore,
It is possible to accurately position and stop at positions Xi (X3), X2 < X4), etc.

In addition, the rollers 112 allow for quick and smooth transfer to and removal from each circulation transfer means 147, 1, and 151.

Also, a lifter 1 that can adjust the vertical position of the actual pallet 50 is provided.
13 are installed. In this embodiment, a two-stage height selection system is used so that the height can be matched to each of the two-story circulation transfer means 141, 141 (151° 151).

This trolley 110 can carry two pallets 50, 50 on it.

Next, the pallet cross conveyor 120 transports the actual pallet 50
are sequentially transported to a day stack device 130, and after the blanks W have been delivered to all transfer presses 2 by the day stack device 130, the empty pallet 50 is transported to the upper carriage 110 in FIG. .

Next, the effect will be explained.

Empty pallet 50 supplied to pallet feed conveyor 60
is sent toward the stacking device 20 (rightward in FIG. 8) by a forward roller 62 driven by a motor 61, as shown in FIGS. 4 and 8.

8 At this point, as shown in FIGS. 3 and 9, the link stopper 82 of the pallet positioning means 80 is lowered, so that the position of the leading end of the empty pallet 50 is regulated by the link stopper 82. The next empty pallet 50 is the first empty pallet 5
It is abutted against the rear end of the

Then, when the motor 61 is stopped and the motor 63 is driven, the forward and backward movement rollers 64 are reversed, and the next empty pallet 50 is returned to the left (reverse movement) in FIG. It is locked to the link stopper 81 that was lowered prior to this.

Therefore, both link stops 81.82 are connected to motors 85. If the position of the next pallet 50 is adjusted in advance with respect to the center of the magazine 30 that will be pushed up later by the screw shaft 86, the center of the next pallet 50 will be a dimension Y1 from the center of the magazine 30.
On the other hand, the center of the previous pallet 50 is shifted by a dimension Y2.

After the two empty pallets 50,50 are thus positioned by the pallet positioning means 80, the lifter 469 of the magazine circulation movement means 40 is raised.

That is, as shown in FIG. 9, when the lifter 46 is raised, both pallets 50, 50 are transferred to the magazine 30 (32) in the positioned state as shown in FIG. 7. Thus, by automatically operating the operating means 70 shown in FIG.
4 can be fixed to the magazine 30 as shown in FIG.

Subsequently, if the roller 42 of the horizontal feed mechanism 41 is rotated and the lever 44 of the predetermined roller 42 is operated by the cylinder 44a as shown by the solid line in FIG.
can move the magazine 30 along the rails 39.39. The magazine 30 that is moved in this manner has the form shown in FIG.

Furthermore, the next roller 42 is operated to send it to the right in FIG.

Then, the leading end of the magazine 30 comes into contact with the stopper 93 of the magazine positioning means 90 and is restrained in position. This stopper 93 operates the slider 0-91 in advance, and the stopper 93 is located at the center of the magazine 30 in FIG.

As shown in FIG. 4, it is adjusted to coincide with the axis P of the press. Therefore, when the magazine 30 is positioned, the centers of both pallets 50, 50 coincide with the pallet supply axes Bl, B2.

In this connection, the two stacking devices 20.20 and the blank supply conveyor 10.10 are already aligned with the axes Bl, B2, as shown in FIG.

Here, the punching press 1 is equipped with a coil supply device 'It' shown in FIG.
2 blanks W from the coil supplied with 3.

When W is simultaneously punched out, both of the discharged blanks are dropped onto the first magnetic conveyor 11 of each supply conveyor 10 and then passed through the second magnetic conveyor 12, as shown in FIGS. 1 and 2. The blanks are loaded into the blank guide 5 and placed on the table 21 of each stacking device 20. Second
The falling point of the magnetic conveyor 12 has been adjusted in advance by the falling position adjusting means 14.

However, two empty pallets 1 on the magazine 30 50.50 can be automatically stacked at the same time.

Thereafter, the stopper 93 shown in FIG. 3 is released, and the horizontal feed 11HII41 is operated again to send the magazine 30 to the position P2 shown in FIGS. 1, 3, and 4.

Here, the operating means 70 is released to release each clamping means 34, and the lifter 46 is lowered from the solid line shown in FIG. 3 to the state shown by the two-dot chain line. In this case, the magazine 30 is lowered together with the lifter 46. On the other hand, rainy weather pallet 50
．． 50 is transferred onto a pallet feed conveyor 100.

Next, the pallet feeding conveyor 100 is started and the pallet is placed on the self-propelled cart 110 on the lower side in FIG.

Since the self-propelled cart 110 is provided with rollers 112 (FIG. 10) having a mechanism similar to the horizontal feed mechanism 41, it is possible to take in two actual pallets 50,50.

Thus, motor 116. By the operation of pinion gear 117, cart 110 is moved along two rails 119 to pallet traverse conveyor 120, as shown in FIG.

Here, the actual pallet 1 is placed on the pallet traverse conveyor 120.
When pallets 50 are being stocked, the self-propelled cart 110 is stopped at position X1, the rollers 112 are reversed, and the actual pallets 50 are delivered to the stockyard 140. In the stockyard 140, the circulation transfer means 141 moves the position
A U-turn is made from X2. Therefore, a large number of actual pallets 50 can be held, and a mismatch in production speed between the two presses 1.2 can be absorbed. In addition, when transferring to the circulation transfer means 141 on the second floor, it is sufficient to raise the lid 113 to a high position before transferring.

Furthermore, when picking up the actual pallet 50 from the stockyard 140, the above procedure may be reversed at position X2. After that, the cart 110 is transferred to the transverse conveyor 120.
Move to.

Then, by adjusting the lifter 113 as necessary and rotating the roller 112, the actual pallet i.50 can be moved to the traverse conveyor 120. Part 3 Moves to 130.

The destacking device 130 adsorbs the blank W in the actual pallet 50 using a vacuum cup or the like and transfers it to the transfer mechanism 4.

Therefore, the transfer press 2 performs predetermined press forming on continuously supplied blanks W to efficiently produce products.

In addition, the empty pallets 50 are also stored in the stockyard 150 (151
) and are automatically managed.

According to this embodiment, the pallet transport circulation system 2 is provided between the stacking device 20 and the day stacking device 130.
00, and a two-story stockyard 140 (150) with circulation transfer means 141 (151) installed in the middle of this conveyance circulation system path 200, so a large number of real (empty) pallets can be transported. 50 can be retained and automatically managed.

Therefore, a mismatch in the production speeds of both presses 1 and 2 can be absorbed, and smooth press production with high efficiency can be achieved.

Further, a magazine circulation moving means 40 circulates the magazine 30 before and after passing through the stacking device 20.
A plurality of empty pallets 50 are placed in the magazine 3 on the upstream side.
0, and a magazine positioning means 90 for positioning the magazine 30 at a predetermined position (press axis P) on the downstream side. It is possible to automatically stack the blanks W on multiple pallets 50 in parallel, achieving a dramatic improvement in production.In addition, the transfer press In addition to eliminating or absorbing the mismatch in processing speed between the punching press 1 and the punching press 1, the punching press 1 can be effectively used for other purposes using the remaining time. Furthermore, simultaneous processing of blanks can be achieved, increasing the effective utilization of the coil.

Further, since the blank supply device 10 is of a type in which the blanks W adsorbed to the lower surface of the belt 16 are dropped downward by the second magnetic conveyor 12, a reliable and stable stacking operation can be ensured. The drop 5 lower position adjusting means 14 further promotes this effect and can also be applied to diversification of the blank W.

Also, magazine 30. Since the magazine circulation moving means 40 is provided, there is no need to separately position and control the plurality of pallets 50 at stacking positions, so high-speed stacking work can be performed and the overall configuration can be extremely simplified.

In addition, the pallet positioning means 80 is composed of a pallet feeding conveyor 60 that moves forward and backward, link stoppers 81, 82, etc., so the equipment is simple and easy to handle, and its position can be arbitrarily selected, making it widely applicable. It is something.

Further, since the horizontal feeding mechanism 41 has a configuration in which each roller 42 is rotated by a common spline shaft 43 and the magazine is transferred by the roller 42 engaged with the magazine 30 by a lever 44, a plurality of pallets 50, 50 Even a heavy magazine 30 loaded with a heavy weight magazine 30 can be transferred with high precision and without shock, and intermittent or continuous transfer can be freely selected.

Furthermore, since the self-propelled cart 110 is provided with six beam covers 113, the problem of the stacking device 20 and the day stacking device 130 being disposed at different levels can be absorbed, and the punching press 1. Each of the transfer presses 2 can be arranged independently to allow operation with increased freedom in layout.

[Effects of the Invention] The present invention has a configuration in which a pallet conveyance circulation system is formed between the stacking device and the day stacking device, and a stockyard in which a circulation transfer means is provided is disposed in the middle of this conveyance circulation system. Because of this, it is possible to store a large number of pallets in an orderly manner, store and manage them easily and accurately, dramatically improve productivity, and achieve significant cost reductions through automation and labor-saving.

In addition, it is possible to eliminate and absorb the mismatch in processing speed between the transfer press and the punching press, and the remaining time can be used to effectively utilize the punching press for other purposes. Furthermore, it has the excellent effect that it is possible to realistically construct equipment that automatically stacks multiple pallets in parallel.

7 Fig. 1 is a plan view showing the overall configuration of an embodiment of the present invention, Fig. 2 is a side view of the stacking device and its surroundings, Fig. 3 is a side view of the magazine circulation movement means, and Fig. 4 mainly shows pallet feeding. A plan view showing the conveyor, Fig. 5 is a plan view of the horizontal feed mechanism, Fig. 6 is a plan view showing the conveyor.
7 is a front view of the magazine, FIG. 8 is a plan view showing the main parts of the pallet positioning means, FIG. 9 is a side view, and FIG. 10 is a front view of the self-propelled cart. .

DESCRIPTION OF SYMBOLS 1... Punching press, 2... Transfer press, 3... Coil supply device, 10... Bunraku supply device, 20... Stacking device, 30... Magazine, 40... Magazine circulation Moving means, 50... Pallet, 60... Pallet feeding conveyor, 70... Operating means, 80... Empty pallet positioning means, 8 90... Magazine positioning means, 100... Pallet feeding conveyor, 110...Self-propelled trolley, 120...Pallet traverse conveyor, 130...Day stack device, 140...Stock yard for actual pallets, 150...
・Stock yard for empty pallets 1~, 141.151...
- Circulation transfer means, 200...Pallet transfer circulation system path.

Claims (1)

[Claims] (1) A pallet transport circulation system path is formed between a stacking device that stores a plurality of blanks in a pallet and a destacking device that takes out blanks one by one from inside the pallet, and the actual pallet in this pallet transport circulation system path. A large number of stockyards for actual pallets are provided in the middle of the conveyance system path, and a large number of stockyards for empty pallets are provided in the middle of the empty pallet conveyance path, and furthermore, a circulation transfer means for real pallets is provided in the actual pallet stockyard. A press line characterized by having a circulation transfer means for empty pallets installed in a stockyard for empty pallets.