JP3631989B2 - Sheet stacking apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet stacking apparatus used in a corrugating machine for producing corrugated cardboard sheets and a method therefor.
[0002]
[Prior art]
There are various types of sheet stacking apparatuses, for example, there is an apparatus called an up stacker shown in FIGS.
This up stacker has a conveyor 11 that conveys the sheet 3 cut at the cut-off 2 to the upper stacking portion 10, and can raise and lower the discharge end 11 a of the conveyor 11. A carry-out conveyor 12 is provided at the lower part of the stacking top 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 stacked sheets (hereinafter referred to as “sheet piles”) 6 reach a predetermined height, the sheet piles 6 are taken out of the apparatus and stocked on the floor conveyor 4 as indicated by a one-dot chain line in FIG. . Generally, the height of the floor conveyor 4 (hereinafter referred to as “FC height”) T is set to be slightly higher than the floor surface FL, and the height of the carry-out conveyor 12 is set to be the same as that of the floor conveyor 4. Sheet guides 13 are provided around the discharge end 11a of the conveyor 11 so that the sheets 3 are stacked neatly.
The discharge end 11a of the conveyer 11 at the start of stacking is at the lowest position as shown by a one-dot chain line in FIG. 6, and rises as the height of the sheet pile 6 increases as the sheets 3 are stacked. When the sheet pile 6 on the pallet 5 reaches a predetermined height, a slat and a gate (not shown) are operated, and the conveyor 11 stops discharging the sheet 3. While the discharge of the sheet 3 is stopped, the sheet pile 6 stacked on the carry-out conveyor 12 is carried out onto the floor conveyor 4, and at the same time, the discharge end 11 a of the transfer conveyor 11 is lowered to the lowest position. During this time, a new pallet 5 is supplied to the conveyor 12. When preparation for the next stacking is completed, the discharge of the sheet 3 by the conveyor 11 is resumed.
[0003]
Stacking is performed in such a cycle, but it is necessary to move the discharge end 11a of the conveyor 11 from the lowest position close to the carry-out conveyor 12 to the highest position corresponding to the maximum pile height of the machine. There is a drawback that the movement stroke of 11a is long. Since the discharge end 11a has a long stroke, the inclination of the transport conveyor 11 changes greatly. As a result, the sheet 3 may slip in various directions on the transport conveyor 11 during transport. It is difficult to control the alignment of the sheet 3. Even though the sheet guides 13 are provided, when the alignment of the sheets 3 is disturbed, when the sheets 3 are stacked on the sheet pile 6, the front / rear and right / left alignment of the sheet pile 6 is also deteriorated.
Therefore, an apparatus (hereinafter referred to as “improved example”) for reducing the amount of change in the angle of the conveyor 11, in other words, reducing the stroke amount of the discharge end 11 a of the conveyor 11 has been proposed. This type of sheet stacking apparatus is also called an up / down stacker and operates as follows.
As shown in FIG. 8, in the improved example, a loading table 22 (corresponding to the carry-out conveyor 12 in FIGS. 6 to 7) is provided on the loading top 20. At the start of loading, as shown in FIG. 8 (a), the discharge end 21a of the conveyor 21 and the loading table 22 are positioned at approximately the middle stage (hereinafter referred to as “intermediate position”) of the maximum loading height of the machine. At this intermediate position, the stacking of the loading table 22 onto the pallet 5 is started. When the sheets 3 are stacked on the pallet 5, as shown in FIG. 5B, the discharge end 21 a remains at that position and does not move up and down, and the stacking table 22 descends. When the loading table 22 reaches the lowest FC height T, the loading table 22 remains in that position as shown in FIG. 5C, and this time the discharge end 21a starts to rise to the pallet 5. Further, the sheets 3 are stacked. When the sheet pile 6 reaches a predetermined height, the discharge of the sheet 3 from the conveyor 21 is stopped, the sheet pile 6 is carried out of the apparatus, and the discharge end 21a is lowered to the intermediate position in parallel. When the discharge of the sheet pile 6 is finished, the stacking table 22 rises to the intermediate position, and the discharge of the sheet 3 from the transport conveyor 21 is resumed.
By operating in this way, in FIGS. 6 to 7, the discharge end 11a had to move from the highest position to the lowest position, whereas in the improved example of FIG. 8, the movement of the discharge end 21a is intermediate. The stroke from the position to the uppermost position is about half that of the conventional one, and the amount of change in the inclination angle can be reduced.
[0004]
However, in the sheet stacking device of the corrugating machine, as a factor that makes the alignment of the sheet piles 6 worse, when the sheet piles are reloaded, the time from when the conveying conveyor 21 stops discharging the sheet until the next restart of discharging (below) "Reloading time"). Since the sheet 3 is continuously supplied from the corrugating machine to the conveyor 21, while the conveyor 21 is stopped, the sheets 3 are closely overlapped and accumulated on the conveyor 21, the sheets 3 are not aligned properly, and the sheets 3 are stacked neatly. become unable.
Another thing to note about the transshipment time is that the corrugating machine requires high-mix low-volume production. That is, there are relatively many things called short orders. Therefore, only 1/2 or 1/3 mountain is piled up without stacking to the maximum height, and the sheet pile 6 is often carried out of the machine at the pile height. Therefore, the transshipment time at this time must also be considered.
[0005]
Therefore, analysis of the transshipment time in the improved type is as follows.
(1) When carrying out the sheet pile 6 with a stacking of 1/2 or less of the maximum stacking height of the machine (hereinafter simply referred to as “stacking of 1/2 or less piles”), the stacking table 22 has an FC height. It takes time A to descend to T. Further, it takes time B to carry the sheet pile 6 out of the apparatus. Furthermore, after the carry-out of the sheet pile 6 to the outside is completed, a time C for raising the loading table 22 to the intermediate position (stacking start position) is also required. Therefore, in the case of stacking 1/2 mountain or less, the total time (A + B + C) of these times A, B, and C is required as the transshipment time.
(2) When carrying out the sheet pile 6 with a stacking of 1/2 or more of the maximum stacking height of the machine (hereinafter simply referred to as “stacking of 1/2 or more peaks”), the stacking table 22 is the lowest Since it is in the carry-out position, time A is unnecessary, but time B and time C are required. Therefore, in the case of stacking more than 1/2 mountain, the total time (B + C) of these times B and C is necessary as the transshipment time. Note that the lowering of the discharge end 21a to the intermediate position is completed in parallel within the transshipment time.
[0006]
[Problems to be solved by the invention]
The present invention has been made to meet the demand for shortening the reloading time in this improved example, and an object of the present invention is to provide a sheet stacking apparatus and method that can further shorten the reloading time in an up / down stacker.
[0007]
[Means for Solving the Problems]
The sheet stacking apparatus according to the present invention includes a stackable table that starts stacking of the corrugated cardboard sheet at an intermediate position of the maximum stacking height of the corrugated cardboard sheet, and a corrugated machine and a corrugated machine that supplies the corrugated machine. In a sheet stacking apparatus having a transport conveyor that discharges to the table and whose discharge end can be raised and lowered, the upper limit position of the stacking table is the intermediate position, and the lower limit position of the discharge end of the transport conveyor is the above The intermediate position is the unloading position of the sheet pile stacked on the loading table to the intermediate position, and when the cardboard sheet starts to be stacked on the loading table, the loading table is set to the intermediate position. While being maintained, the discharge end of the conveyor is raised, and the cardboard sheets are stacked on the stacking table.
The stacking table has been extended so that the stacked piles can be stocked.
The sheet pile carry-out position is different from the floor conveyor, and a lifter is provided for carrying the sheet pile carried out from the loading table to the floor conveyor.
[0008]
Sheet costing method according to the present invention, the corrugated cardboard sheet costing start position cardboard maximum stacking an intermediate position in the height of the seat to the product on the table of the up-down stacker, the sheet piles that are stacked on said product table aircraft the unloading position to the outside and the intermediate position, at the beginning stage of the ball seat stacked to the product on the table, the on the product table while is maintained in the intermediate position, to discharge the cardboard sheet into the product on the table conveyance the discharge end of the conveyor is raised following the accumulation of cardboard sheets, after the discharge end of the conveyor has reached the upper limit, while to maintain the discharge end of the conveyor to the upper limit position, cardboard on the product table perform stacking of corrugated cardboard sheets is lowered following the accumulation of sheets, after the stacked cardboard sheets is completed, the product on the table The raised to the intermediate position, and so as to discharge the sheet stack to the outside.
Further, the sheet stacking method according to the present invention includes a sheet pile stacked on the stacking table, with the corrugated sheet stacking start position on the stacking table of the up / down stacker being an intermediate position of the maximum stacking height of the corrugated sheet. When the stacking position of the corrugated cardboard sheet to the loading table is set as the intermediate position,
With the stacking table maintained at the intermediate position, the discharge end of the conveyor for discharging the cardboard sheets to the stacking table is raised following the stacking of the cardboard sheets, and the discharge end of the conveyor is raised When the stacking of corrugated cardboard sheets on the stacking table is completed by the time, the stacking table is maintained at the intermediate position and the sheet pile is carried out of the machine.
The above loading table can separately stack sheets in a state where the stacked piles are stocked on the carry-out side, and the sheet pile to be carried out is returned on the carry-out side while the above-mentioned pile-up table returns to the sheet pile carry-out position. Let's go to.
The sheet pile unloaded from the loading table is guided by a lifter to a floor conveyor having a height different from the sheet pile unloading position.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the sheet stacking apparatus and method according to the present invention will be described with reference to the drawings. 1 to 3 show the first embodiment, FIG. 4 shows the second embodiment, and FIG. 5 shows the third embodiment. In addition, illustration of the sheet 3 and the sheet guides 13 described in the conventional example is omitted for the sake of simplicity.
[0010]
As shown in FIG. 1, in the first embodiment, in the up / down stacker 1, the position at which the stacked sheet pile 6 is carried out of the machine (hereinafter referred to as “carrying position”) is defined as the maximum stacking height H of the machine. Is provided at approximately half the position. The upper part 30 is dug lower than the floor surface FL, and as shown in FIG. 2, the unloading position is made the same as the FC height T (see FIG. 7) as in the conventional example. The discharge end 31a of the conveyor 31 has a discharge position (see the solid line in the figure) as a lower limit, and ascends upward by about ½ of the maximum stacking height of the machine (see the dashed line in the figure). The loading table 32 has an unloading position (see the solid line in the figure) as an upper limit, and descends downward from that by about ½ of the maximum pile height of the machine (see the dashed line in the figure).
[0011]
The up / down stacker 1 configured as described above operates as follows. As shown to (a) of FIG. 3, the discharge end 31a of the conveyance conveyor 31 exists in a discharge position at the time of a stacking start, and the stacking table 32 exists in a carrying-out position. That is, the discharge end 31a is located at the lowermost end, and the loading table 32 is located at the uppermost end. The stacking of the sheets 3 is performed by raising the discharge end 31a of the transport conveyor 31 until the stacking height is ½ of the maximum stacking height of the machine, as shown in FIG. . The loading table 32 remains at the carry-out position, that is, the uppermost position. As shown in (c) of the figure, when the stacked height is equal to or greater than 1/2 of the maximum stacked height of the machine (the height of the discharge end 31a at this time is referred to as “1/2 mountain position”) The sheet 3 continues to be stacked while the loading table 32 descends. The discharge end 31a of the conveyer 31 is at the 1/2 peak position, that is, the uppermost position. As shown in FIG. 5D, when the stacking table 32 is at the lowermost position and the sheet pile 6 reaches the maximum stacking height of the machine, the conveyor 31 stops discharging the sheet 3. As shown in FIG. 5E, the sheet pile 6 is unloaded from the machine after the loading table 32 has been raised to the unloading position. In parallel with this out-of-machine delivery, the discharge end 31a of the conveyor 31 descends and returns to the lowest end position.
[0012]
The transshipment time when operating in this way is as follows.
(1) When the stacking is finished with 1/2 or less piles, the discharge end 31a of the conveyor 31 is located between the lowermost end and the uppermost end, while the loading table 32 is at the uppermost end, that is, the unloading position. The moving time A of the loading table 32 is not necessary. Since the lowering of the discharge end 31a of the conveyor 31 is performed in parallel with the unloading of the sheet pile 6, only the unloading time B of the sheet pile 6 is required. Therefore, in the case of stacking 1/2 mountain or less, only time B is required as the transshipment time.
(2) When stacking more than 1/2 mountain, the discharge end 31a of the conveyor 31 is located at the uppermost end, while the loading table 32 is located between the uppermost end and the lowermost end or at the lowermost end. Therefore, the rising time A to the unloading position of the loading table 32 and the unloading time B of the sheet pile 6 are required. Therefore, in the case of stacking more than 1/2 mountain, the total time (A + B) of these times A and B is required as the transshipment time.
[0013]
As described above, according to the present embodiment, in the case of the stacking of 1/2 mountain or less, the total time of the time A, the time B, and the time C in the past is only the time B, and clearly the transshipment time. Can be shortened. In the case of stacking more than 1/2 mountain, the total time of time B and time C is conventionally. However, since time A depends on the stacking height at that time, the stroke is generally shorter than that of time C. The time A is shorter than the time C. Therefore, the transshipment time is shorter in this embodiment.
[0014]
Although the case where the carry-out position is 1/2 of the maximum stacked height has been described, the same effect can be obtained even if the height is slightly changed. It is desirable that the height be about 1/3 to 2/3.
[0015]
Next, a second embodiment will be described with reference to FIG. The parts common to the first embodiment are denoted by the same reference numerals in the drawings and the description thereof is omitted. In the present embodiment, the reloading time is further shortened. As shown in FIG. 4, the loading table 42 can accommodate one sheet pile 6 outside the apparatus on the carry-out side of the sheet pile 6. Thus, the placement area of the sheet pile 6 is made larger than that of the first embodiment (see the loading table 32 in FIG. 2). The sheet pile 6 carried out from the inside of the apparatus can be temporarily stored in the place provided on the carry-out side.
With this configuration, it is possible to carry out the unloading of the sheet pile 6 and the lifting of the loading table 42 simultaneously in parallel. For this reason, even in the case of stacking more than 1/2 mountain, the transshipment time is the longer of time A or time B, and time A and time B, which are the transshipment time in the first embodiment. And less than the total time. Generally, since the unloading time B is longer, the transshipment time is time B. Therefore, in the case of this embodiment, the transshipment time is the time B regardless of whether the stacking is less than 1/2 mountain or the stacking more than 1/2 mountain.
It should be noted that it takes time to move the sheet pile 6 from the loading table 42 to the floor conveyor 4, and thus it seems to affect the reloading time, but as described in the first embodiment, in the present invention, Stacking starts from the unloading position, and the conveyor 31 moves up until the ½ pile is loaded, but the loading table 42 does not move, so the sheet pile 6 can be transferred from the loading table 42 to the floor conveyor 4 during that time. This will not affect the transshipment time.
[0016]
Next, a third embodiment will be described with reference to FIG. The parts common to the first and second embodiments are denoted by the same reference numerals in the drawings and the description thereof is omitted. Unlike the first and second embodiments, the present embodiment shows a configuration in which the stacked portion 30 (see FIGS. 1 to 4) does not have to be dug down and arranged below the floor surface FL. The upper part 50 is installed on the floor surface 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 of the carry-on conveyor 42 on the carry-out side, and a lifter 54 that moves up and down between the carry-out position height and the FC height T is provided on the carry-out side.
In the present embodiment, the sheet pile is carried out at a higher position than in the first and second embodiments. The sheet pile 6 carried out from the loading table 42 is once stocked on the stock conveyor 53, lowered to the height of the floor conveyor 4 by a lifter 54 at an appropriate time, and transferred to the floor conveyor 4. By doing so, the sheet pile 6 unloaded at a high unloading position can be handled at the normal FC height T.
In FIG. 5, although only one sheet pile is stocked on the stock conveyor 53, the present invention is not limited to this.
[0017]
【The invention's effect】
In the sheet stacking apparatus according to the present invention, in the up / down stacker that starts sheet stacking on the stacking table at an intermediate position of the maximum stacking height, the sheet pile unloading position is provided at the intermediate position of the maximum stacking height. The transshipment time can be shortened compared to the prior art.
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 conveying conveyor for transporting the sheet to the stacking table is raised following the stacking of the sheets. After the transport conveyor reaches the upper limit, the stacking table is lowered and the sheets are stacked. Therefore, even when the sheet piles having different heights are carried out, the reloading time can be shortened as compared with the prior art.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an up / down stacker to which a sheet stacking apparatus and a method therefor according to a first embodiment of the present invention are applied and sheets are not shown.
FIG. 2 is a schematic cross-sectional view taken along line AA in FIG.
3 is a schematic cross-sectional view partially showing an upper part of FIG. 1, wherein (a) to (e) are cross-sectional views showing the operation of the up / down stacker in time series.
FIG. 4 is a schematic cross-sectional view corresponding to line AA in FIG. 1, of an up / down sticker to which a sheet stacking apparatus and method according to a second embodiment of the present invention are applied.
FIG. 5 is a schematic cross-sectional view corresponding to line AA in FIG. 1, of an up / down sticker to which a sheet stacking apparatus and method according to a third embodiment of the present invention are applied.
FIG. 6 is a schematic cross-sectional view of a conventional sheet stacking apparatus (up stacker).
7 is a schematic cross-sectional view taken along line VII-VII in FIG.
FIGS. 8A and 8B are schematic cross-sectional views partially showing an upper part of a stack in another conventional sheet stacking apparatus (up-down stacker), and FIGS. 8A to 8C are cross-sectional views showing operation states in time series. FIGS. It is.
[Explanation of symbols]
1 Up-down stacker (sheet stacking device)
2 Cut-off 3 Sheet 4 Floor conveyor 5 Pallet 6 Sheet pile 30, 50 Upper stack 31 Transport conveyor 31a Discharge end 32, 42 Loading table 53 Stock conveyor 54 Lifter FL Floor H Maximum stacking height T of the floor conveyor height

Claims (7)

A stackable table that can be raised and lowered to start the stacking of the corrugated cardboard sheet at an intermediate position of the maximum stacked height of the corrugated cardboard sheet;
In the sheet stacking apparatus provided with a transport conveyor that discharges the corrugated cardboard sheet supplied from the corrugating machine to the stacking table and the discharge end thereof can be raised and lowered.
The upper limit position of the loading table is the intermediate position,
The lower limit position of the discharge end of the conveyor is the intermediate position,
The unloading position of the sheet pile stacked on the loading table is set as the intermediate position,
At the start of stacking of cardboard sheets onto the above loading table,
The sheet stacking apparatus, wherein the cardboard sheets are stacked on the stacking table by raising the discharge end of the conveyor while maintaining the stacking table at the intermediate position . By extending the product on the table, on a sheet product according to claim 1, characterized in that to be able to stock a complete sheet pile stacker. With sheet pile unloading position is configured such that a position different from the floor conveyor, a sheet pile which is carried out from on the product table according to claim 2, characterized in that a lifter for conveying to the floor conveyor Sheet stacking device. The cardboard sheet product on the starting position of the product on the table of the up-down stacker to an intermediate position of the maximum stacking height of the cardboard sheet,
The unloading position of the sheet pile stacked on the loading table is set as the intermediate position,
At the start of stacking of cardboard sheets onto the above loading table,
While keeping the stacking table at the intermediate position, raise the discharge end of the conveyor to discharge the cardboard sheet to the stacking table following the stacking of the cardboard sheets,
After the discharge end of the conveyor reaches the upper limit,
While keeping the discharge end of the conveyor at the upper limit position, the stacking table is lowered following the stacking of the cardboard sheets to stack the cardboard sheets,
After the stacking of cardboard sheets is finished,
A sheet stacking method, wherein the stacking table is raised to the intermediate position and the sheet pile is carried out of the apparatus. The starting position of the cardboard sheet on the up / down stacker stacking table is set to the middle position of the maximum stacking height of the cardboard sheet,
  The unloading position of the sheet pile stacked on the loading table is the intermediate position,
  At the start of stacking of cardboard sheets on the above loading table,
While maintaining the stacking table at the intermediate position, raise the discharge end of the conveyor to discharge the cardboard sheet to the stacking table following the stacking of the cardboard sheets,
  When the stacking of cardboard sheets on the stacking table is completed before the discharge end of the conveyor reaches the rising limit,
The loading table is maintained at the intermediate position, and the sheet pile is carried out of the machine.
  A sheet stacking method characterized by the above. The above loading table can separately stack sheets in a state where the stacked piles are stocked on the carry-out side, and the sheet pile to be carried out is returned on the carry-out side while the above-mentioned pile-up table returns to the sheet pile carry-out position. The sheet stacking method according to claim 4 , wherein the sheet stacking method is performed. Sheet costing method according to any one of claims 4-6, characterized in that for guiding the sheet pile taken out of the product on the table to the floor conveyor of the sheet pile unloading position different heights in the lifter.

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