JP3621828B2 - Cardboard sheet stacking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet stacking device (stacker) for stacking cardboard sheets manufactured by a corrugating machine.
[0002]
[Prior art]
FIG. 3 shows an outline of a conventional stacker. In FIG. 3A, a continuous cardboard sheet manufactured on the upstream side is cut into a predetermined dimension at a cutoff 2 of a slitter scorer (not shown). Then, the cut sheet 1 is discharged onto the conveyor 5 of the stacker 4 via the defective paper removing device 3 by the discharge conveyor 2a of the cut-off 2 and further discharged onto the stacking unit 7 via the conveyor 6.
The stacking unit 7 is provided with a lifting platform 8 for receiving the sheets 1 discharged from the conveyor 6, and the lifting platform 8 is guided and supported by columns 9 installed on both sides thereof so as to be slidable in the vertical direction. ing. That is, the lifting platform 8 is suspended by the chain 10 and is lifted and lowered by the action of the hydraulic cylinder 11.
[0003]
When the sheets 1 are stacked on the lifting platform 8 (hereinafter, the stacked sheets are referred to as “stack” 12), the lifting platform 8 is sequentially lowered to discharge the upper surface of the stack 12 and the discharge end of the conveyor 6. The head is kept constant. When the elevator 8 reaches the lower end, that is, when the stack 12 reaches the maximum height position, the discharge of the sheet 1 from the conveyor 6 is stopped.
Thereafter, the stack 12 is fed toward the carry-out conveyor 13 by a drive conveyor 8a built in the lifting platform 8, as shown in FIG. This carry-out conveyor 13 is also driven by an appropriate means, and the stack 12 is taken out from the drive conveyor 8a of the lifting platform 8. When the stack 12 is unloaded, the elevator 8 is raised, the discharge of the sheet 1 from the conveyor 6 is resumed, and the stacking of sheets on the elevator 8 is continued.
[0004]
The type of stacker in which the conveyor 6 for discharging the sheets 1 is fixed and the elevator 8 of the stacking unit 7 receiving the stack 12 can be raised and lowered is called a down stacker. The stacking unit 7 is provided with a presser roll 15 that is located on the exit side of the conveyor 6 and keeps the posture of the sheet 1 discharged from the conveyor 6 constant. Further, a beam 14 is stretched between the columns 9, and a guide 16 that can move between the columns 9 according to the sheet size is provided on the beam 14. The guide 16 has a function of stopping the sheet discharged from the conveyor 6 and restricting the movement, thereby forming the stack 12.
[0005]
[Problems to be solved by the invention]
As described above, the down stacker has the conveyor 6 fixed, and the stacking accuracy (alignment) is good because the conveyance of the sheet 1 conveyed on the down stacker and the posture of the sheet 1 discharged from the conveyor are stable. There are advantages. However, there are the following drawbacks.
In other words, there is no problem when the height of the stack 12 is always stacked up to the maximum height position, but the quantity may not be full at the end of a certain production lot or depending on the production lot. . In such a case, the lifting platform 8 does not reach the lowest position and is still in an intermediate position. Therefore, in order to carry out the stack 12 from this state, since the time for lowering the lifting platform 8 to the lowest position is added to the normal transshipment time, the transshipment time becomes longer accordingly.
Here, the transshipment time is formulated.
Transshipment time = lifting platform lowering time (a) + stack unloading time (b)
+ Lifting platform rise time (c)
It becomes. The times a, b, and c vary depending on the distance that must be moved. Now, let A be the time for the lifting platform 8 to move from the top to the bottom and C be the time for the lift 8 to move from the bottom to the top. Strictly speaking, the carry-out time of the stack 12 varies depending on the sheet size, but here it is constant and B.
[0006]
As described above, it is necessary to stop the discharge of the sheet 1 from the conveyor 6 during the transshipment. However, since the cut-off 2 continues to be carried out from the cut-off 2 to the stacker 4 during that time, there is an extra amount on the stacker 4. The sheets 1 accumulate, and the alignment of the sheets 1 on the conveyor 6 is disturbed, causing jamming up and uneven stack 12. Therefore, shortening of transshipment time is desired.
[0007]
The present invention has been made in view of such a situation, and an object of the present invention is to provide a sheet stacking apparatus capable of shortening the stack reloading time and downsizing the equipment.
[0008]
[Means for Solving the Problems]
To achieve the problems of the prior art, in the present invention, a conveyor means for discharging the corrugated cardboard sheet at the upstream side Ru are continuously produced in the stacking unit, provided in the stack unit, and from said conveying means and vertically movable lifting table for receiving the discharged cardboard sheets, cardboard sheets which are stacked on the elevator platform, and discharge conveyor for unloading into place, met stacking apparatus cardboard sheet with a
The carry-out conveyor is provided at a predetermined height between the position of the lifting platform when stacking the maximum stackable height and the position of the uppermost end in the lifting range of the lifting platform,
(A) When the position of the elevating table when the cardboard sheets that have reached a predetermined number to be carried out to the carry-out conveyor are stacked is higher than a predetermined height at which the carry-out conveyor is provided, the stack is piled up The lifting platform is lowered to the installation height of the carry-out conveyor, and after the stack is carried out to the carry-out conveyor side and reloaded, it is raised and returned to receive the cardboard sheet discharged from the transfer means,
(B) When the position of the lifting platform when the cardboard sheets that have reached a predetermined number to be carried out to the carry-out conveyor are stacked is lower than a predetermined height at which the carry-out conveyor is provided, the stack is piled up The lifting platform rises up to the installation height of the carry-out conveyor, and after the stack is carried out to the carry-out conveyor side and reloaded, it is raised and returned to receive the cardboard sheet discharged from the transfer means,
(C) When the position of the lifting / lowering platform when a predetermined number of cardboard sheets to be carried to the carry-out conveyor are stacked is the same as the predetermined height at which the carry-out conveyor is provided, The platform is lifted and returned to receive the cardboard sheet discharged from the conveying means after the stack is carried out to the carry-out conveyor side and reloaded on the spot .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments.
[0010]
FIG. 1 is a configuration diagram showing a sheet stacking device (stacker) according to an embodiment of the present invention.
The stacker 20 in the present embodiment is a down stacker of the same type as the conventional one, and a slitter scorer (not shown) cut-off 22 is disposed upstream of the stacking portion 21 as shown in FIG. In addition, a defective paper removing device 23 is installed. A discharge conveyor 22 a is disposed between the cut-off 22 and the defective paper removing device 23, and a plurality of conveying conveyors 24, 25, 26 serving as conveying means are disposed between the defective paper removing device 23 and the stacking unit 21. Are arranged in a fixed state.
[0011]
The stacking unit 21 is provided with a lifting platform 28 that can be moved up and down to receive the cutting sheet 27 discharged from the conveyor 26. For this reason, struts 29 are erected at intervals on the front, rear, left and right sides of the stacking portion 21, and the lifting platform 28 is suspended by a chain 30 and is lifted and lowered by the action of the hydraulic cylinder 31. The column 29 is guided and supported so as to be slidable in the vertical direction. When the cutting sheets 27 are stacked on the lifting platform 28, a stack 32 is obtained.
Further, the stacking unit 21 is provided with a presser roll 33 located on the exit side of the transport conveyor 26. The presser roll 33 is swingably attached to the support column 29 via the arm 34, and is transported by the transport conveyor. 26 is installed to keep the posture of the sheet 27 discharged from the head 26 constant.
Further, a beam 35 extending in the horizontal direction is stretched between the front and rear support columns 29, and the end of the sheet 27 discharged from the conveyor 26 is stopped against the beam 35 to form a stack 32. A guide 36 is provided so that it can move between the columns 29 according to the sheet size.
[0012]
On the other hand, on the downstream side of the stacking portion 21, a carry-out conveyor (carrying means) 37 for carrying the stack 32 on the lift 28 is provided as shown in FIG. In addition, in the present embodiment, the carry-out conveyor 37 is provided not at the lowermost end of the lifting range of the lifting platform 28 but at an approximately middle position between the uppermost end and the lowermost end of the lifting range (hereinafter referred to as “stroke”). It has been. In FIG. 1 (b), since the lowermost end of the stroke of the lifting platform 28 is set and arranged at substantially the same level as the floor surface 38 as in the prior art, the height position of the carry-out conveyor 37 from the floor surface 38 is conventional. Is set higher than. For this reason, the floor 38 is provided with a conveyor table 39 on which the carry-out conveyor 37 is installed.
[0013]
In this way, the height position of the carry-out conveyor 37 is provided substantially at the center of the stroke of the lifting / lowering base 28, whereby the stacker 20 of the present embodiment is different from the conventional stacker 4 in the following structural differences. There is.
That is, the support column 29 is installed higher than the conventional support column 9, and a stack 32 having a height that is half of the total height stack is provided between the beam 35 and the like to which the guide 36 is attached and the conveyor 26. A space 40 that can be accommodated is provided. Further, although not shown in detail, the presser roll 33 is configured to be retracted to a position retracted from the front end of the conveyor 26 as indicated by a chain line in FIG.
[0014]
Here, the transshipment of the stack 32 having a height that is half the total height in the stacker 20 according to the embodiment of the present invention will be considered.
At this time, the elevator 28 is at substantially the same level as the carry-out conveyor 37 as indicated by the chain line in the figure, so the time a = 0 when the elevator 28 descends. Further, the stack carry-out time b = B is the same as the conventional one. Furthermore, the time for the lift 28 to rise is c = C / 2 because the moving distance is half of the stroke. For simplicity, if the descent time and the ascending time of the elevator 28 are the same A, the transshipment time is the conventional example A / 2 + B + C (= A) = 3A / 2 + B
The present embodiment is 0 + B + C / 2 (= A / 2) = A / 2 + B, and clearly the transshipment time is shorter in this embodiment.
[0015]
Similarly, when considering the transfer of the stack 32 of the full height, conventionally, the lifting / lowering table lowering time is 0, the stack unloading time is B, and the lifting / lowering table rising time is C (= A).
On the other hand, in the present embodiment, at the time of transshipment, the lift 28 is positioned below the carry-out conveyor 37 by a distance of half the stroke, so a = 0. Must be raised. This time is C / 2 (= A / 2). The stack discharging time is the same B, and the rising time c from the stack unloading position of the lifting platform 28 to the highest position is C / 2 (= A / 2) because the moving distance is half of the stroke.
Contrast this with
Conventional example 0 + B + C (= A) = A + B
Embodiment A / 2 + B + C / 2 (= A / 2) = A + B
Therefore, it will be the same transshipment time after all.
Therefore, according to the stacker 20 of the embodiment of the present invention, there is no effect when the stack 32 is full height, but when the stack 32 is low, the reloading time can be greatly shortened.
[0016]
【The invention's effect】
As described above, the sheet stacking apparatus according to the first aspect of the present invention includes the conveying unit that discharges the cut sheet manufactured on the upstream side to the stacking unit, and is provided in the stacking unit and is discharged from the transporting unit. was provided with a vertically movable lifting table for receiving the sheet, maximum stack unloading conveyor, which is stacked on the elevator platform and the uppermost end of the lifting range of the lifting platform for unloading the stack obtained sheet to said elevating table Since the height of the stack is set at a predetermined height, especially when the stack height is low, it is possible to greatly shorten the stack reloading time and improve productivity. Further, the equipment can be reduced in size by arranging the stacked portions low.
The sheet stacking apparatus according to the second aspect of the present invention includes a conveying unit that discharges the cut sheet manufactured on the upstream side to the stacking unit, and a sheet that is provided in the stacking unit and is discharged from the conveying unit. and a vertically movable lifting table for receiving the carry-out conveyor for unloading the sheets are stacked on the lifting platform is, maximum height of the stack are stacked on the elevator platform and the uppermost end of the lifting range of the lifting platform of predetermined height between the position, since is provided corresponding to the height of more productive frequent mountain stack, it is possible to obtain the same effect as the invention described above.
Furthermore, the sheet stacking method according to the present invention of claim 4 includes a conveying unit that discharges the cut sheet manufactured on the upstream side to the stacking unit, and a sheet that is provided in the stacking unit and discharged from the conveying unit. A sheet stack provided at a predetermined height between the uppermost end and the lowermost end of the lifting range of the lifting platform. When the carrying conveyor is installed at a predetermined height between the uppermost end and the lowermost end of the lifting / lowering range of the lifting platform, and the stacks of the stack height are stacked on the lifting platform, When the height is lower than the predetermined height, the lifting platform is lowered to the installation height of the carry-out conveyor, and in this state, the stack is carried out to the carry-out conveyor side and reloaded. When the stack height is higher than the predetermined height from the stack unloading position, the lifting platform is raised to the installation height of the unloading conveyor, and in this state, the stack is moved to the unloading conveyor side. Since the platform is raised from the stack unloading position to the uppermost end after unloading and stacking and unloading the stack, the same effect as the above invention can be obtained.
According to a fifth aspect of the present invention, there is provided a sheet stacking method including a conveying unit that discharges a cut sheet manufactured on the upstream side to a stacking unit, and a sheet that is provided in the stacking unit and is discharged from the conveying unit. And a carry-out conveyor for carrying out the sheets stacked on the lift base is a predetermined height between the uppermost end and the lowermost end of the lift range of the lift base. Using a sheet stacking device provided corresponding to the height position of many pile stacks , the carry-out conveyor is a mountain with a high production frequency within a predetermined height between the uppermost end and the lowermost end of the lifting range of the lifting platform. When the pile stack height is lower than the predetermined height when the stacks of the pile stacks are stacked on the lifting platform, the lifting platform is moved to the carry-out conveyor. Down to the installation height of In this state, the stack is carried out to the carry-out conveyor side and reloaded, and after the stack has been carried out, the lifting platform is raised from the stack carry-out position to the uppermost end, and the stack height is higher than the predetermined height. The lifting platform rises to the installation height of the carry-out conveyor, and in this state, the stack is carried out to the carry-out conveyor side and reloaded, and after the carry-out of the stack is finished, the lift platform is raised from the stack carry-out position to the uppermost end. Therefore, the same effect as the above invention can be obtained.
[0017]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the present invention. is there.
In the present embodiment, for the sake of simplicity, the carry-out conveyor 37 of the carry-out means is provided in the center of the stroke of the lifting platform 28, which is effective when the frequency of the 1/2 mountain stack is high. However, when the factory has a lot of 1/3 stacks or 2/3 stacks, the carry-out conveyor 37 may be provided at the 1/3 position or 2/3 position of the stroke. Well, the height position of the carry-out conveyor 37 is not necessarily limited to the center of the stroke.
[0018]
【The invention's effect】
As described above, the present invention includes a conveying means for discharging the corrugated cardboard sheet at the upstream side Ru are continuously produced in the stacking unit, provided in the stack unit, and can be raised and lowered for receiving a corrugated cardboard sheet discharged from the transport means and Do elevation frame, the cardboard sheets are stacked on the elevator platform, met stacking apparatus cardboard sheet and a discharge conveyor for unloading to a predetermined location, the output conveyor, the maximum height that can be stacked Provided at a predetermined height between the position of the elevating platform when the stack is stacked and the position of the uppermost end in the elevating range of the elevating platform, and (a) a predetermined amount to be carried out to the carry-out conveyor When the position of the lifting platform when the number of cardboard sheets that have reached the number is higher than a predetermined height at which the carry-out conveyor is provided, the lifting platform in which the stack is stacked is After descending to the installation height of the bear, the stack is carried out to the carry-out conveyor side and reloaded, and then returned to receive the cardboard sheet discharged from the carrying means, and (b) should be carried out to the carry-out conveyor When the position of the lifting platform when the cardboard sheets that have reached a predetermined number are stacked is lower than a predetermined height at which the carry-out conveyor is provided, the lift platform in which the stack is piled up is the installation height of the carry-out conveyor. After the stack is carried out to the carry-out conveyor side and reloaded, it is raised and returned to receive the cardboard sheet discharged from the carrying means, and (c) a predetermined number of sheets to be carried out to the carry-out conveyor If the position of the lifting platform when the reached cardboard sheets are stacked is the same as the predetermined height at which the carry-out conveyor is provided, the stack is stacked. Geta the lifting platform, after transshipment by unloading the stack to the output conveyor side on the spot, since the increased return to receive the cardboard sheet discharged from the transport means, in particular the height of the stack When it is low, it is possible to significantly shorten the time for reloading the same stack, to improve productivity, and to reduce the size of the equipment by arranging the stacking portion low.
[Brief description of the drawings]
FIG. 1 conceptually shows a configuration of a stacker according to an embodiment of the present invention, wherein (a) is a front view thereof and (b) is a side view thereof.
FIG. 2 conceptually shows the configuration of a stacker according to another embodiment of the present invention, in which (a) is a front view thereof and (b) is a side view thereof.
FIG. 3 conceptually shows the configuration of a conventional stacker, where (a) is a front view thereof and (b) is a side view thereof.
[Explanation of symbols]
20, 20a Stacker 21, 21a Stacking unit 22 Cut-off 23 Defective paper removing device 26 Conveyor 27 Cutting sheet 28 Lifting base 29 Column 30 Chain 31 Hydraulic cylinder 32 Stack 33 Pressing roll 34 Arm 35 Beam 36 Guide 37 Unloading conveyor 38 Floor surface 40 spaces

Claims (1)

Conveying means for discharging the stacking unit cardboard sheet that will be produced continuously on the upstream side, it is provided in the stack portion, and a vertically movable lifting table for receiving the discharged cardboard sheets from said transport means, the lifting platform the cardboard sheets are stacked on a discharge conveyor for unloading into place, met stacking apparatus cardboard sheet with a
The carry-out conveyor is provided at a predetermined height between the position of the lifting platform when stacking the maximum stackable height and the position of the uppermost end in the lifting range of the lifting platform,
(A) When the position of the elevating table when the cardboard sheets that have reached a predetermined number to be carried out to the carry-out conveyor are stacked is higher than a predetermined height at which the carry-out conveyor is provided, the stack is piled up The lifting platform is lowered to the installation height of the carry-out conveyor, and after the stack is carried out to the carry-out conveyor side and reloaded, it is raised and returned to receive the cardboard sheet discharged from the transfer means,
(B) When the position of the lifting platform when the cardboard sheets that have reached a predetermined number to be carried out to the carry-out conveyor are stacked is lower than a predetermined height at which the carry-out conveyor is provided, the stack is piled up The lifting platform rises up to the installation height of the carry-out conveyor, and after the stack is carried out to the carry-out conveyor side and reloaded, it is raised and returned to receive the cardboard sheet discharged from the transfer means,
(C) When the position of the lifting / lowering platform when a predetermined number of cardboard sheets to be carried to the carry-out conveyor are stacked is the same as the predetermined height at which the carry-out conveyor is provided, The platform is lifted and returned to receive the cardboard sheet discharged from the conveying means after the stack is carried out on the spot to the carry-out conveyor side and reloaded.
Stacking apparatus of corrugated cardboard sheets according to claim.

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