JP2003104615A - Sheet stacking device and method for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet stacking device and method therefor capable of shortening the time of load transfer in the operation to be made using an up- and-down stacker. SOLUTION: At the time of starting the stacking operation, the ejection end 31a of a transport conveyor 31 is located at the undermost while a stacking table 32 is positioned at the uppermost as shown in (a). Stacking the sheets 3 is made by the transport conveyor 31 whose ejection end 31a rises until the stacking height attains 1/2 of the maximum height as shown in (b). When the stacking height exceeds it, stacking the sheets 3 is performed while the stacking table 32 is lowering as shown in (c). When the table 32 attains the undermost position and a sheet pile 6 reaches the maximum stacking height, sheet ejection from the conveyor 31 is stopped as shown in (d). The sheet pile 6 is carried out after the table 32 has risen to the carryout position as shown in (e). In parallel therewith the ejection end 31a lowers to return to the undermost position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet stacking apparatus and method used in a corrugating machine for producing corrugated board sheets.

[0002]

2. Description of the Related Art There are various types of sheet stacking apparatus, for example, there is an up stacker shown in FIGS. This up stacker
It has a conveyer conveyor 11 that conveys the sheet 3 cut by the cutoff 2 to the stacking portion 10, and the discharge end 11a of this conveyer conveyor 11 can be moved up and down. A carry-out conveyor 12 is provided below the stacking section 10, and the sheets 3 discharged from the discharge end 11 a are stacked on the pallet 5 placed on the carry-out conveyor 12. When the piles of sheets (hereinafter referred to as “sheet piles”) 6 thus stacked reach a predetermined height, the sheet piles 6 are carried out of the machine and stocked on the floor conveyor 4 as shown by a chain line in FIG. . Generally, the height of the floor conveyor 4 (hereinafter referred to as “FC height”) T
Is installed at a level slightly higher than the floor FL, and the carry-out conveyor 1
The height of 2 is set to be the same as that of the floor conveyor 4. Sheet guides 13 for guiding the sheets 3 to be piled up cleanly are provided around the discharge end 11 a of the conveyor 11. Discharge end 1 of the conveyor 11 at the start of stacking
1a is at the lowest position as shown by the alternate long and short dash line in FIG.
As the height of the sheet pile 6 increases due to the stacking of the sheets 3, the sheet pile 6 rises. When the sheet pile 6 on the pallet 5 reaches a predetermined height, a slat or a gate (not shown) is activated and the conveyor 11 stops the discharge of the sheet 3. While the discharge of the sheet 3 is stopped, the sheet piles 6 piled up on the discharge conveyor 12 are discharged onto the floor conveyor 4, and in parallel with this, the discharge end 11 of the transport conveyor 11 is discharged.
Lower a to the lowest position. During this time, a new pallet 5 is supplied to the conveyor 12. When the preparation for the next stacking is completed, the discharge of the sheets 3 by the transport conveyor 11 is restarted.

Although stacking is performed in such a cycle, it is necessary to move the discharge end 11a of the transfer conveyor 11 from the lowermost position near the discharge conveyor 12 to the uppermost position corresponding to the maximum stacking height of the machine. , Unloading end 11a
Has the drawback of having a long moving stroke. Discharge end 11
Since the stroke of “a” is long, the inclination of the transport conveyor 11 changes greatly, which may cause the sheet 3 to slip in various directions on the transport conveyor 11 in various directions during transport, and the sheet on the transport conveyor 11 may be slid. It is difficult to control the alignment of 3. Although the sheet guides 13 are provided, when the sheets 3 are not aligned properly, when the sheets 3 are stacked on the sheet pile 6, the alignment of the sheet pile 6 in the front, rear, left, and right also deteriorates. Therefore, in order to reduce the amount of change in the angle of the transport conveyor 11, in other words, the transport conveyor 11
An apparatus (hereinafter referred to as "improved example") for reducing the stroke amount of the discharge end 11a has been proposed. This type of sheet stacking device, which is also called an up-down stacker, operates as follows. As shown in FIG. 8, in the improved example, a stacking table 22 (corresponding to the carry-out conveyor 12 in FIGS. 6 to 7) that can be moved up and down is provided in the stacking section 20. At the start of stacking, as shown in (a) of FIG. 8, the discharge end 21a of the conveyor 21 and the stacking table 22 are located at approximately the middle stage of the maximum stacking height of the machine (hereinafter referred to as "intermediate position"). Then, the stacking of the stacking table 22 onto the pallet 5 is started at this intermediate position. When the sheets 3 are stacked on the pallet 5, as shown in (b) of the figure, the discharge end 21a does not move up and down at that position, but the stacking table 22 descends. When the stacking table 22 reaches the FC height T at the bottom end, as shown in (c) of the figure, the stacking table 22 remains at that position, and the discharge end 21a starts to move up to the pallet 5 this time. Further, the sheets 3 are stacked. When the sheet pile 6 reaches a predetermined height, the discharge of the sheet 3 from the transport conveyor 21 is stopped, the sheet pile 6 is carried out of the machine, and the discharge end 21a descends to the intermediate position in parallel. When the discharge of the sheet pile 6 is completed, the stacking table 22 moves up to the intermediate position, and the transport conveyor 2
The discharge of the sheet 3 from 1 is restarted. By operating in this way, in FIG. 6 to FIG.
While it is necessary to move a from the highest position to the lowest position, in the improved example of FIG. 8, the discharge end 21a can be moved from the intermediate position to the uppermost position in about half the stroke of the conventional type. The amount of change in the tilt angle can be reduced.

However, in the sheet stacking apparatus of the corrugating machine, a factor that deteriorates the alignment of the sheet piles 6 is that the transfer conveyor 2 is used when the sheet piles are reloaded.
There is a time (hereinafter, referred to as "reloading time") from 1 when sheet discharge is stopped to when sheet discharge is restarted. Since the sheets 3 are continuously supplied from the corrugating machine to the transport conveyor 21, the sheets 3 are closely overlapped and accumulated on the transport conveyor 21 while the discharge of the transport conveyor 21 is stopped, the alignment of the sheets 3 is disturbed, and the sheets 3 are piled up cleanly. become unable. Another thing to note about the transshipment time is that the corrugated machine requires high-mix low-volume production. That is, there are relatively many things called short orders, and therefore 1 /
Since it is often the case that only two or one-third piles are piled up and the sheet pile 6 is carried out of the machine at the stacking height, the transshipment time at this time must also be taken into consideration.

Then, the transshipment time in the improved type is analyzed as follows. (1) When unloading the sheet pile 6 with a stacking height of 1/2 or less of the maximum stacking height of the machine (hereinafter simply referred to as "stacking with 1/2 mountain or less"), the stacking table 22 has the FC height. It takes time A to descend to T. Also, the sheet pile 6
It also takes time B to carry the machine out of the machine. Further, after the unloading of the sheet pile 6 to the outside of the machine is completed, a time C for raising the stacking table 22 to the intermediate position (stacking start position) is also required. Therefore, in the case of stacking up to ½ mountain or less, the total time (A + B + C) of these times A, B, and C is required as the transshipment time. (2) When the sheet piles 6 are carried out by stacking at least ½ of the maximum stacking height of the machine (hereinafter simply referred to as “stacking over ½ mountain”), the stacking table 22 is at the bottom. Since it is at the carry-out position, the time A is unnecessary, but the time B and the time C are required. Therefore, in the case of stacking ½ mountain or more, the total time (B + C) of these times B and C is required as the transshipment time. The discharge end 21a
The lowering to the intermediate position of is completed in parallel within the transshipment time.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to meet the demand for shortening the transshipment time in this improved example, and provides a sheet stacking apparatus and method for further shortening the transshipment time in an up-down stacker. The purpose is to do.

[0007]

According to the sheet stacking apparatus of the present invention, in the up-down stacker in which the stacking of sheets on the stacking table is started at the intermediate position of the maximum stacking height, the sheet pile carry-out position is set to the maximum stacking height. It was installed in the middle position. The sheet pile unloading position is preferably a position of 1/3 to 2/3 of the maximum stacking height. The stacking table has been extended to allow stocking of piled sheet piles. The sheet pile carry-out position is different from the floor conveyor, and a lifter for carrying the sheet pile carried out from the stacking table to the floor conveyor is provided.

In the sheet stacking method according to the present invention, the sheet stacking start position of the stacking table of the up / down stacker is set as the sheet pile unloading position, and the transport conveyor for transporting the sheet to the stacking table follows the stacking of the sheets. After the conveyance conveyor reaches the upper limit, the stacking table is lowered to stack the sheets. The stacking table can separately stack the sheets with the piled sheet piles being stocked on the unloading side. While the stacking table returns to the sheet pile unloading position, the unloading sheet piles are unloading side. Advance to. The sheet pile carried out from the stacking table is guided by the lifter to the floor conveyor at a height different from the sheet pile carrying-out position.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a sheet stacking apparatus and method according to the present invention will be described with reference to the drawings. 1 to 3 show the second embodiment, FIG. 4 shows the second embodiment, and FIG. 5 shows the third embodiment. In addition,
The illustration of the sheet 3 and the sheet guides 13 described in the conventional example is omitted for simplification.

As shown in FIG. 1, in the first embodiment,
A position in the up-down stacker 1 where the stacked sheet piles 6 are carried out of the machine (hereinafter referred to as "carry-out position")
Is provided at a position of approximately 1/2 of the maximum stacking height H of the machine. The stacking portion 30 is dug below the floor surface FL, and as shown in FIG.
The carry-out position is the same as the FC height T (see FIG. 7).
The discharge end 31a of the conveyor 31 has a discharge position (see the solid line in the figure) as the lower limit, and rises upward from there by about 1/2 of the maximum stacking height of the machine (see the dashed line in the figure). The stacking table 32 has an upper limit at the carry-out position (see the solid line in the figure), and descends downward from there by about ½ of the maximum stacking height of the machine (see the dashed line in the figure).

The up / down stacker 1 thus constructed operates as follows. As shown in FIG. 3A, at the start of stacking, the discharge end 31a of the conveyor 31 is at the discharge position, and the stacking table 32 is at the discharge position.
That is, the discharge end 31a is located at the bottom end, and the stacking table 32 is located at the top end. The stacking of the sheets 3 is shown in (b) of the same figure.
As shown in, the stacking height is one of the maximum stacking heights of the machine.
Until the height of / 2, the discharge end 31 of the conveyor 31
a rises. The stacking table 32 remains at the carry-out position, that is, the uppermost position. As shown in (c) of the same figure, when the stacking height is ½ or more of the maximum stacking height of the machine (the height of the discharge end 31a at this time is referred to as “1/2 mountain position”), Sheet 3 while stacking table 32 descends
Continue to accumulate. The discharge end 31a of the conveyor 31 is 1
/ 2 crest position, that is, the uppermost position. (D) of the same figure
When the stacking table 32 reaches the lowermost position and the sheet pile 6 reaches the maximum stacking height of the machine, the conveyor 31 stops the discharge of the sheets 3 as shown in FIG. As shown in (e) of the figure, when the sheet pile 6 is carried out of the machine,
This is performed after the stacking table 32 has been raised to the carry-out position. In parallel with this unloading, the discharge end 31a of the transfer conveyor 31
Will return to the lowest position.

The transshipment time when operating in this way is as follows. (1) When the stacking is completed with 1/2 or less, the discharge end 31a of the conveyor 31 is located between the lowermost end and the uppermost end, while the stacking table 32 is at the uppermost end, that is, the carry-out position. The moving time A of the stacking table 32 is unnecessary. Since the lowering of the discharge end 31a of the conveyor 31 is performed in parallel with the unloading of the sheet pile 6, the sheet pile 6
It takes only the carry-out time B. Therefore, in the case of stacking up to ½ mountain or less, only the time B is required as the transshipment time. (2) When stacking more than 1/2 pile, the discharge end 31a of the conveyor 31 is located at the uppermost end, while the stacking table 32 is located between the uppermost end and the lowermost end or at the lowermost end. Therefore, the raising time A to the unloading position of the stacking table 32 and the unloading time B of the sheet pile 6 are required. Therefore, in the case of stacking more than ½ mountain, the total time (A + B) of these times A and B is required as the transshipment time.

As described above, according to the present embodiment, in the case of stacking up to ½ mountain or less, conventionally, time A, time B, and time C are used.
What was the total time with was only time B,
Obviously, the transshipment time can be shortened. In addition, even in the case of stacking more than 1/2 peak, time B and time C are conventionally used.
However, the time A depends on the stacking height at that time, but the stroke is generally shorter than that in the case of the time C. Therefore, the time A is shorter than the time C. Therefore, the transshipment time is shorter than that of the present embodiment. Is short.

The carry-out position is 1/2 of the maximum stacking height.
Although the case has been described, the same effect can be obtained even if this height is slightly changed, and the range is as follows.
For example, it is desirable that the height is approximately 1/3 to 2/3 of the maximum stacking height.

Next, a second embodiment will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals in the drawings and the description thereof will be omitted. This embodiment is intended to further shorten the transshipment time. As shown in FIG. 4, the stacking table 42 can accommodate one sheet pile 6 outside the machine on the unloading side of the sheet pile 6. The seating area of the sheet pile 6 is set in the first embodiment (see the stacking table 32 in FIG. 2).
Bigger than that. The sheet pile 6 carried out from the inside of the machine can be temporarily stored in the above-mentioned location provided on the carry-out side. With such a configuration, it is possible to carry out the sheet pile 6 and raise the stacking table 42 at the same time in parallel. Therefore, even in the case of stacking ½ or more mountains, the transshipment time is the longer time of the time A or the time B, and the transshipment time of the first embodiment is the time A and the time B. It will be shorter than the total time of. Generally, since the carry-out time B is longer, the transshipment time is the time B. Therefore, in the case of this embodiment, 1 /
The transshipment time is the time B regardless of whether the piles are 2 piles or less or 1/2 piles or more. It should be noted that it takes time to move the sheet pile 6 from the stacking table 42 to the floor conveyor 4, and this seems to affect the transshipment time. However, as described in the first embodiment, according to the present invention, Starting stacking from the carry-out position, 1/2
Although the conveying conveyor 31 rises until the pile is piled up, the stacking table 42 does not move, so that the sheet pile 6 can be transferred from the stacking table 42 to the floor conveyor 4 during that period, which does not affect the transshipment time at all. .

Next, a third embodiment will be described with reference to FIG. The same parts as those in the first and second embodiments are designated by the same reference numerals in the drawings, and the description thereof will be omitted. Unlike the first and second embodiments, the present embodiment shows a configuration in which the stacking unit 30 (see FIGS. 1 to 4) does not need to be dug and arranged below the floor surface FL. The stack 50 is installed on the floor FL, and the carry-out position is higher than that in the first and second embodiments. A stock conveyor 53 is provided at the carry-out position height on the carry-out side of the loading conveyor 42, and a lifter 54 that moves up and down between the carry-out position height and the FC height T is provided at the carry-out side. In this embodiment, the first
Or, the sheet pile is carried out at a higher position than in the case of the second embodiment. The sheet piles 6 carried out from the stacking table 42 are temporarily stocked on the stock conveyor 53, and at a suitable time, they are lowered to the height of the floor conveyor 4 by the lifter 54 and transferred to the floor conveyor 4. By doing so, the sheet pile 6 carried out at the high carry-out position can be handled at the normal FC height T. In FIG. 5, only one sheet pile is stocked on the stock conveyor 53, but the present invention is not limited to this.

[0017]

According to the sheet stacking apparatus of the present invention, in the up-down stacker in which the stacking of sheets on the stacking table is started at the intermediate position of the maximum stacking height, the sheet pile carry-out position is set at the intermediate position of the maximum stacking height. Since it is provided in the above, the transshipment time can be shortened as compared with the conventional case. In the sheet stacking method according to the present invention, the sheet stacking start position of the stacking table of the up-down stacker is set as the sheet pile unloading position, and the transport conveyer that conveys the sheet to the stacking table is lifted following the stacking of the sheet. After the conveyance conveyor reaches the upper limit, the stacking table is lowered to stack the sheets. Therefore, even when the sheet piles of different heights are carried out, the transshipment time can be shortened compared to the conventional case.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an up-down stacker to which a sheet stacking apparatus and a sheet stacking method according to a first embodiment of the present invention have been applied, the illustration of which is omitted.

2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic cross-sectional view partially showing the stacking portion of FIG.
(A) thru | or (e) are each sectional drawing which shows operation | movement of an up-down stacker in a time series.

FIG. 4 is a view of an up-down sticker to which the sheet stacking apparatus and method according to the second embodiment of the present invention are applied.
It is a schematic sectional drawing corresponding to the line AA of FIG.

FIG. 5 is a view of an up-down sticker to which a sheet stacking apparatus and method according to a third embodiment of the present invention are applied.
It is a schematic sectional drawing corresponding to the line AA of FIG.

FIG. 6 is a schematic cross-sectional view of a conventional sheet stacking device (up stacker).

7 is a schematic cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a schematic sectional view partially showing a stacking portion in another conventional sheet stacking apparatus (up / down stacker),
(A) thru | or (c) are each sectional drawing which shows a mode of operation in a time series.

[Explanation of symbols]

1 Up-down stacker (sheet stacking device) 2 cut off 3 sheets 4 floor conveyor 5 pallets 6 sheet pile 30, 50 Stack 31 Transport Conveyor 31a discharge end 32, 42 Rolling table 53 stock conveyor 54 Lifter FL floor H Maximum stacking height of machine Height of T floor conveyor

Claims (7)

[Claims] 1. An up-down stacker which starts stacking sheets on a stacking table at an intermediate position of maximum stacking height, wherein a sheet pile carry-out position is provided at an intermediate position of maximum stacking height. Upper device. 2. The sheet stacking apparatus according to claim 1, wherein the sheet pile unloading position is a position of 1/3 to 2/3 of the maximum stacking height. 3. The sheet stacking apparatus according to claim 1, wherein the stacking table is extended so that the piled sheet piles can be stocked. 4. The sheet pile carry-out position is different from that of the floor conveyor, and a lifter for carrying the sheet pile carried out from the stacking table to the floor conveyor is provided. The sheet stacking apparatus according to Item 3. 5. The sheet stacking start position of the stacking table of the up / down stacker is set as the sheet pile unloading position, and the transport conveyor for transporting the sheet to the stacking table is moved up following the stacking of the sheets, and the transport conveyor is After reaching the upper limit, the sheet stacking method is characterized by lowering the stacking table to stack the sheets. 6. The stacking table can separately stack the sheets with the piled sheet piles stocked on the unloading side, and unloads the stacking table while returning to the sheet pile unloading position. The sheet stacking method according to claim 5, wherein the sheet pile is advanced to the unloading side. 7. The sheet pile carried out from the stacking table is guided by a lifter to a floor conveyor having a height different from the sheet pile carry-out position.
Sheet stacking method described in.