JP2014061959A - Device for conveying stacked sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for conveying stacked sheets that can stack sheets in short cycle time.SOLUTION: A conveyor unit 4 for conveying a stack of sheets S is composed of a plurality of dividing conveyors 8 that can ascend and descend. The dividing conveyors 8 positioned below and outside both ends of the stack of sheets S are descended to convey the stack of sheets S, with a space 52 being formed below both ends of the stack of sheets S. A pair of first clicks 7A arranged on the space 52 are moved and ascended in the same direction as a direction of conveying the stack of sheets S so as to lift a first stack of sheets S without stopping conveying the stack of sheets S on the conveyor unit 4 and then put the lifted first stack of sheets S down on a second stack of sheets S on the conveyor unit 4.

Description

  The present invention relates to a stacking and conveying apparatus for stacking sheets while transporting sheet stacks.

  In a corrugator that produces corrugated cardboard sheets, a single continuous cardboard sheet produced by a single facer and double facer is cut by a slitter along the longitudinal direction and divided into a plurality of strips, and then orthogonal to the longitudinal direction. The sheet is cut by a cutter along the direction to form a sheet, and the sheet is fed to the sheet stacker on the most downstream side of the corrugator.

  The sheet stacker sequentially stacks the cardboard sheets sent from the upstream side, and each time the cardboard sheets are stacked to a predetermined height, the stacked cardboard sheets (hereinafter referred to as “sheet piles”) are discharged. To do. The stack of sheets discharged from the sheet stacker is sent to the storage line. The storage line is a conveyor line that retains a large number of sheet piles in order to absorb the difference between the corrugator production speed of corrugated sheet and the processing speed of printing and punching of the corrugated board in the subsequent box making line.

  By the way, a corrugated cardboard sheet produced by a corrugator is cut by a slitter and divided into a plurality of strips before being cut into sheets by a cutter. Therefore, when corrugated sheets are stacked on the sheet stacker at the most downstream side of the corrugator, a plurality of sheet piles are simultaneously formed adjacent to each other via a slitter cutting line. When the sheet pile is discharged from the sheet stacker, the sheet pile is conveyed while being adjacent to each other via a slitter cutting line.

  Further, in the corrugator, a plurality of production lots having different cardboard sheet dimensions and base paper configurations are continuously produced. Then, when this production lot is switched, the sheet stacker discharges the sheet pile of the lot whose production has been completed at the height accumulated at that time, and the cardboard sheet of the next production lot is piled up as a new sheet pile. It is done.

  For this reason, when a small production lot with a small number of sheets to be produced is switched, a plurality of adjacent short sheet piles are discharged from the sheet stacker via a slitter cutting line. Also, even in a large production lot with a large number of productions, a tall sheet pile is discharged from the sheet stacker at the beginning of the production lot, but after that the last sheet pile of the production lot is discharged , The pile of seats may be short.

  In this way, when a plurality of adjacent short stacks of sheets are discharged from the sheet stacker through the slitter cutting line, if the sheet stacks are sent to the storage line as they are, the limited number of spaces in the storage line is reduced. It occupies with a small number of sheet piles, and the occupying efficiency of the storage line decreases. In addition, if a short sheet pile is sent to the storage line as it is, the number of sheet piles that stay in the storage line increases, so the number of cardboard sheets that cause scratches or dents at the bottom of the sheet pile also increases. The loss rate of the sheet becomes worse.

  Therefore, conventionally, when a plurality of adjacent short stacks of sheets are discharged from the sheet stacker through the slitter cutting line, manual operation is performed to improve the storage line occupation efficiency and the cardboard sheet loss rate. Then, the work was carried out to reduce the number of sheet piles (hereinafter referred to as “reloading work”) by reloading a plurality of short sheet piles onto a tall sheet pile.

Japanese Unexamined Patent Publication No. 2000-233831

  However, since even a short seat pile has a considerable weight, the work of transferring the seat pile requires considerable physical strength. In addition, the corrugator is operated without stopping during this transshipment operation, and the corrugated sheet of the next production lot is continuously produced, so the first sheet pile of the next production lot is discharged from the sheet stacker. It is necessary to complete the work in a short time. As described above, the sheet pile re-loading operation is a labor-intensive operation for the operator.

  Therefore, the inventor of the present application, when a plurality of adjacent low sheet piles are ejected from the sheet stacker through the slitter cutting line, the operator reloads the plurality of low sheet piles and moves the back of the sheet pile. In order to eliminate the effort of gathering high sheet piles, we considered installing a device at the exit of the sheet stacker that stacks multiple low piles discharged from the sheet stacker.

  Here, as an apparatus capable of stacking a plurality of sheet piles, for example, a stacking apparatus disclosed in Patent Document 1 is known. The stacking device receives the first sheet pile from the upstream conveyor to the lifting conveyor, then lowers the lifting conveyor by an amount corresponding to the height of the sheet pile, and in that state, from the upstream conveyor to the lifting conveyor. The second sheet pile is fed onto the first sheet pile, and finally, the lifting conveyor is raised to the original position, and the sheet pile stacked up and down is sent to the downstream side (FIG. 6 of the same document). .

  However, since this stacking apparatus needs to once stop the flow of conveying the sheet pile when stacking the sheet pile, the cycle time required for stacking the sheet pile is long. Therefore, if this stacking device is installed at the exit of the sheet stacker and a plurality of short stacks of sheets discharged from the sheet stacker are to be stacked by the stacking device, the sheet stack of the next production lot will be There is a possibility that the stacking operation of the sheet piles may not be completed before the sheet stacker is discharged.

  Therefore, the inventors of the present application have studied how to shorten the cycle time required to stack the sheet piles, and as a result, do not stop the flow of sheet piles received from the upstream side. We focused on the fact that the cycle time required for stacking the sheet piles can be made extremely short if the sheet piles can be stacked while being conveyed.

  The problem to be solved by the present invention is to provide a stacking and conveying apparatus for stacking sheets capable of stacking sheet stacks in a short cycle time.

In order to solve the above-described problem, a conveyor unit that horizontally conveys a plurality of sheet piles arranged without gaps in the conveyance direction in a state where spaces are formed below both ends of the sheet piles;
A pair of first claws arranged in the space below both ends of the sheet pile conveyed by the conveyor unit;
The pair of first claws is the same as the sheet pile conveyance speed in the same direction as the sheet pile conveyance direction on the conveyor unit from below the first sheet pile among the plurality of sheet piles conveyed by the conveyor unit. Or by raising the lower surface of the first sheet pile to a position higher than the upper surface of the second sheet pile without stopping the conveyance of the sheet pile on the conveyor unit. A first claw driving device for moving the pair of first claws so as to lower the lifted first sheet pile onto the second sheet pile on the conveyor unit;
The configuration having the above is adopted in the stacking and conveying apparatus for the stack of sheets.

  In this case, when the first claw lifts the lower surface of the first sheet crest to a position higher than the upper surface of the second sheet crest, the lifting operation is performed by the first claw in the conveying direction of the sheet crest on the conveyor unit. The first sheet crest is conveyed while conveying the sheet crest without stopping the flow of conveyance of the sheet crest on the conveyor unit. Can be stacked on the second sheet pile. Therefore, the cycle time required for stacking the sheet piles is short.

  The pair of first claws lifts the lower surface of the first sheet crest to a position higher than the upper surface of the second sheet crest and then stops the second crest, and the second sheet crest is immediately below the raised first sheet crest. Although it is possible to drive to stand by in a stationary state until it is conveyed by the conveyor unit, in this case, it takes a long time to lift the first sheet pile and lower it onto the second sheet pile. Become.

  Therefore, in order to more effectively shorten the cycle time required to stack the sheet piles, the pair of first claws lift the lower surface of the first sheet pile to a position higher than the upper surface of the second sheet pile. The conveying direction of the sheet pile on the conveyor unit while the first sheet pile is lifted up until the lifted first sheet pile is lowered onto the second sheet pile on the conveyor unit. It is preferable to drive with the first claw driving device so as to move in the opposite direction.

  In this case, the first claw lifts the lower surface of the first sheet peak to a position higher than the upper surface of the second sheet peak, and then lowers the lifted first sheet peak onto the second sheet peak. Since this time is shortened, the cycle time required to stack the sheet piles can be more effectively shortened.

  Further, at this time, after the first claw lifts the lower surface of the first sheet mountain to a position higher than the upper surface of the second sheet mountain, the first claw is lowered until the first sheet mountain is lowered onto the second sheet mountain. Since the conveyance distance of the second sheet pile is shortened, the length of the conveyor unit can be reduced. Therefore, it is suitable for installation in a limited space at the exit of the sheet stacker.

Further, the pair of second claws are configured to be movable independently of the pair of first claws, and are disposed in the space below the both ends of the sheet pile conveyed by the conveyor unit;
Immediately after the pair of first claws have lowered the first sheet pile onto the second sheet pile, the pair of second claws are moved from the lower side of the second sheet pile to the conveying direction of the sheet pile on the conveyor unit. The lower surface of the second sheet crest is moved to the third sheet without stopping the conveyance of the sheet crest on the conveyor unit by moving it in the same direction at a speed equal to or faster than the conveying speed of the sheet crest. A second claw driving device that moves the pair of second claws so as to lift the second sheet crest up to a position higher than the top surface of the crest, and to lower the lifted second sheet crest onto the third sheet crest on the conveyor unit;
Is preferably provided.

  In this way, while conveying the sheet pile without stopping the flow of the sheet pile on the conveyor unit, the first sheet pile and the second sheet pile stacked in the vertical direction are placed on the third sheet pile. Can be stacked.

  Here, as a method of stacking the first sheet pile, the second sheet pile, and the third sheet pile, the third sheet pile is lifted, and the first sheet pile in a state where the third sheet pile is stacked up and down. A method of stacking on the sheet pile and the second sheet pile is conceivable. In this case, when the third sheet pile is lifted, the height corresponding to the sheet pile of two steps (the first pile in the stacked state) is considered. It is necessary to lift the sheet pile up to the height of the sheet pile and the second sheet pile, and the time required to lift the sheet pile increases.

  Therefore, as described above, the first sheet peak and the second sheet peak in a state of being stacked one above the other are lifted, and the first sheet peak and the second sheet peak are stacked on the third sheet peak. Then, when lifting the first and second sheet piles stacked in the vertical direction, the sheet pile is lifted to a height corresponding to one sheet pile (the height of the third sheet pile). This will reduce the time required to lift the seat pile. Therefore, the cycle time required for stacking the sheet piles can be shortened more effectively.

  Further, in order to more effectively shorten the cycle time required to stack the sheet piles, the pair of second claws lifts the lower surface of the second sheet pile to a position higher than the upper surface of the third sheet pile. The conveying direction of the sheet pile on the conveyor unit while the second sheet pile is lifted up until the lifted second sheet pile is lowered onto the third sheet pile on the conveyor unit. It is preferable that the second claw driving device is driven so as to move in the opposite direction.

  If it does in this way, after the 2nd nail lifts the lower surface of the 2nd sheet peak to the position higher than the upper surface of the 3rd sheet peak, the 3rd sheet peak is a conveyor just under the lifted 2nd sheet peak. Since it takes less time to lower the lifted second sheet pile onto the third sheet pile than when waiting in a stationary state until it is conveyed by the unit, the cycle time required to stack the sheet piles is reduced. It becomes possible to shorten more effectively. In addition, the second claw lifts the lower surface of the second sheet peak to a position higher than the upper surface of the third sheet peak, and then takes the third time until the lifted second sheet peak is lowered onto the third sheet peak. Since the conveyance distance of the sheet pile is shortened, the length of the conveyor unit can be made compact.

  Further, the pair of first claws are positioned below both end portions of the third sheet pile on the conveyor unit when the pair of second claws lowers the second sheet pile on the third sheet pile. It is preferable to drive with the first claw driving device.

  In this case, when the second claw lowers the second sheet pile on the third sheet pile, the first claw waits below the third sheet pile, so that the second sheet pile is moved to the third sheet pile. Immediately after being lowered onto the sheet, it is possible to start the operation of lifting the third sheet pile with the first pawl and stacking it on the fourth sheet pile.

  The conveyor unit is composed of a plurality of divided conveyors arranged in a direction orthogonal to the conveying direction of the sheet pile, and each divided conveyor includes a rising position where the conveying surface contacts the lower surface of the sheet pile, and a lower surface of the sheet pile. It is configured to be able to move up and down between the lowering position where the conveying surface is separated, and lowering the lower part of both ends of the sheet pile by lowering the lower part of each of the divided conveyors and the outer part of the dividing conveyor located on the outside thereof. A material that forms the space can be employed. If it does in this way, it can respond to a plurality of types of sheet piles with different dimensions, and is suitable for installation at the exit of a sheet stacker that discharges sheet piles with different dimensions corresponding to various production lots.

  In the sheet pile stacking and conveying apparatus according to the present invention, the first claw moves in the same direction as the sheet pile conveying direction on the conveyor unit at a speed equal to or faster than the sheet pile conveying speed. The lower surface of the sheet pile is raised to a position higher than the upper surface of the second sheet pile, and the raised first sheet pile is lowered onto the second sheet pile on the conveyor unit. It is possible to stack the first sheet pile on the second sheet pile while conveying the sheet pile without stopping the flow. Therefore, the cycle time required for stacking the sheet piles is short.

The top view which shows the sheet conveying apparatus incorporating the stack conveyance apparatus of the sheet pile of embodiment of this invention Enlarged view of the stacking and conveying apparatus shown in FIG. Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. The enlarged view of the vicinity of the 1st nail | claw and the 2nd nail | claw of FIG. Sectional view along line VI-VI in FIG. Sectional drawing along the VII-VII line of FIG. The perspective view of the vicinity of the 1st nail | claw and the 2nd nail | claw of FIG. (A) is a figure which shows the state just before a 1st nail | claw lifts a 1st sheet | seat pile in the process of stacking | stacking a sheet | seat pile with the stack conveyance apparatus shown in FIG. 2, (b) is a side view of (a). Figure (A) is a state in which the first claw lifts the lower surface of the first sheet peak to a position higher than the upper surface of the second sheet peak in the process of stacking the sheet peaks in the stacking and conveying apparatus shown in FIG. The figure to show, (b) is a side view of (a) (A) is a figure which shows the state immediately after the 1st nail | claw lowered the 1st sheet peak on the 2nd sheet peak in the process in which the stacking | stacking conveyance apparatus shown in FIG. ) Side view of (a) (A) shows a state in which the second claw lifts the lower surface of the second sheet mountain up to a position higher than the upper surface of the third sheet mountain in the process of stacking the sheet piles in the stack conveyance device shown in FIG. The figure to show, (b) is a side view of (a) (A) is the figure which shows the state immediately after the 2nd nail | claw lowered the 2nd sheet peak on the 3rd sheet peak in the process in which the stacking | stacking conveyance apparatus shown in FIG. ) Side view of (a) FIG. 1 is a plan view showing a state in which a large sheet crest along the conveying direction is fed into the sheet conveying apparatus shown in FIG. The figure which shows the state just before a 1st nail | claw and a 2nd nail | claw lift the 1st sheet | seat pile in the process of stacking | stacking a sheet | seat pile with the stack conveyance apparatus shown in FIG. In the process of stacking the sheet piles with the stacking and conveying apparatus shown in FIG. 14, immediately after the first claw and the second claw lift the lower surface of the first sheet mountain to a position higher than the upper surface of the second sheet mountain. Diagram showing state FIG. 14 is a diagram illustrating a state immediately after the first claw and the second claw descend the first sheet crest on the second sheet crest in the process of performing the stacking operation of the sheet crest with the stack conveyance device illustrated in FIG. 14. The figure explaining the height of the sheet pile when the height of the sheet pile after stacking exceeds the height of the sheet pile discharged from the sheet stacker at the normal time. The process of dividing the sheet pile shown in FIG. 18 into small piles of small batches, and stacking the sheet piles of each small batch with the stacking and conveying apparatus shown in FIG. Figure explaining

  FIG. 1 shows a sheet conveying apparatus in which a stack of sheet piles according to an embodiment of the present invention is incorporated. The sheet conveying apparatus includes an upstream conveyor 1, a stacked conveying apparatus 2, and a downstream conveyor 3 that are arranged in series in order from the upstream side to the downstream side along the conveying direction.

  The upstream conveyor 1 is arranged so that the inlet of the upstream conveyor 1 (the upper end of the upstream conveyor 1 in FIG. 1) is connected to the outlet of a sheet stacker (not shown). The upstream conveyor 1 receives a plurality of sheet ridges S discharged from the sheet stacker in the sheet width direction and conveys them horizontally, and sends the sheet ridges S to the stack conveyance device 2. At this time, the plurality of sheet piles S are conveyed in a state of being arranged without gaps in the sheet width direction. The sheet width direction is a direction parallel to the corrugated board. The upstream conveyor 1 employs a belt conveyor to prevent the bottom corrugated cardboard sheet from being scratched or dented when the sheet stack S discharged from the sheet stacker is conveyed. Yes.

  The downstream conveyor 3 is arranged so that the outlet of the downstream conveyor 3 (the lower end of the downstream conveyor 3 in FIG. 1) is connected to a storage line (not shown). The downstream conveyor 3 receives the sheet pile S discharged from the stacking and conveying apparatus 2 and horizontally conveys it, and sends the sheet pile S to the storage line. Similarly to the upstream conveyor 1, the downstream conveyor 3 employs a belt conveyor so that the lowermost corrugated cardboard sheet of the sheet pile S is not damaged or dented.

  As shown in FIG. 2, the stacking and conveying device 2 is disposed on the left and right sides of the conveyor unit 4 that receives a plurality of sheet piles S arranged without gaps in the conveying direction from the upstream conveyor 1 and horizontally conveys them. The pair of main frames 5, the pair of first claw driving devices 6A and the pair of second claw driving devices 6B supported by the pair of main frames 5, and the first claw driving device 6A and the second claw driving device. It has a pair of 1st nail | claw 7A and 2nd nail | claw 7B each driven by 6B. The conveyor unit 4 includes a plurality of divided conveyors 8 arranged in a direction orthogonal to the conveying direction of the sheet pile S.

  As shown in FIG. 3, each of the divided conveyors 8 is capable of rotating at a rear end of the conveyor frame 9, a conveyor frame 9 extending along the conveying direction, a head pulley 10 rotatably provided at the front end of the conveyor frame 9, and the conveyor frame 9. A tail pulley 11 provided on the conveyor belt 9, a drive pulley 12 provided below the conveyor frame 9, a conveyor belt 13 wound between the head pulley 10, the tail pulley 11 and the drive pulley 12, and the conveyor frame 9. And a conveyor lifting device 14 to be driven.

  The head pulley 10 and the tail pulley 11 are driven pulleys that rotate following the conveyance belt 13. The head pulley 10 and the tail pulley 11 are supported by the conveyor frame 9 so as to move up and down integrally with the conveyor frame 9 when the conveyor frame 9 moves up and down. One head pulley 10 and one tail pulley 11 are provided for each divided conveyor 8.

  The drive pulley 12 is a pulley that is rotationally driven by the conveyor drive motor 15 shown in FIG. 2, and is common to these divided conveyors 8 so as to collectively drive a plurality of divided conveyors 8 arranged in a direction orthogonal to the conveying direction. And one is provided. The drive pulley 12 is supported independently of the conveyor frame 9 so as to rotate at a fixed position, and the drive pulley 12 does not move up and down even when the conveyor frame 9 moves up and down.

  As shown in FIG. 3, a pair of guide pulleys 16 are provided in the vicinity of the drive pulley 12 on the feeding side and the drawing side of the conveying belt 13. The guide pulley 16 is a pulley that secures a winding angle of the conveyor belt 13 with respect to the drive pulley 12. The guide pulley 16 is also supported independently of the conveyor frame 9 like the drive pulley 12. The drive pulley 12 is provided with a rotation sensor (not shown). The rotation sensor detects the conveyance distance of the sheet pile S on the division conveyor 8. Here, in order to prevent slippage between the drive pulley 12 and the conveyor belt 13, it is preferable that the drive pulley 12 is a toothed pulley and the conveyor belt 13 having a shape that meshes with the teeth of the drive pulley 12 is employed.

  The conveyor lifting device 14 is provided for each conveyor frame 9 so that each divided conveyor 8 can be lifted and lowered independently. Further, the conveyor lifting device 14 is provided at one end and the other end of the conveyor frame 9, respectively. As the conveyor lifting device 14, a pneumatic cylinder that expands and contracts up and down with compressed air can be employed. Further, the conveyor frame 9 is supported by an elevating guide 17 provided at one end and the other end of the conveyor frame 9 so as to be movable up and down.

  As shown in FIG. 4, each divided conveyor 8 is driven from the raised position where the conveying surface (that is, the upper surface of the divided conveyor 8) comes into contact with the lower surface of the sheet pile S by the driving of the conveyor lifting device 14, and from the lower surface of the sheet pile S. It can be moved up and down between the lowered position where the conveying surface is separated. The raising / lowering stroke of the division conveyor 8 is set in the range of about 50 to 150 mm. By setting the lifting / lowering stroke to be larger than 50 mm, an insertion space 52 for the first claw 7A and the second claw 7B is secured between the lower surface of both ends of the sheet pile S and the upper surface of the divided conveyor 8 at the lowered position. can do. By setting the lifting / lowering stroke to be smaller than 150 mm, the height of the conveying surface of the divided conveyor 8 at the rising position can be suppressed, so that the height is raised to the lower surface of the sheet pile S discharged from the existing sheet stacker. It becomes easy to make the height of the upper surface of the division conveyor 8 in position correspond.

  As shown in FIGS. 2 and 3, the main frame 5 is supported by linear guides 18 provided at the front end and the rear end of each divided conveyor 8 so as to be movable in a direction perpendicular to the conveying direction of the sheet pile S. Yes. Each main frame 5 is provided with a main frame driving device 19 that moves the main frame 5 in a direction orthogonal to the conveying direction of the sheet pile S.

  As shown in FIG. 2, the main frame driving device 19 includes a pair of rotating shafts 20 and 21 arranged at intervals in a direction perpendicular to the conveying direction of the sheet pile S so as to sandwich the conveyor unit 4 therebetween. An electric motor 22 that drives one rotating shaft 20, a sprocket 23 that rotates integrally with the rotating shaft 20, a sprocket 24 that is mounted on the other rotating shaft 21 so as to be capable of relative rotation, and windings around these sprockets 23, 24. The chain 25 is hung. The chain 25 is connected to the main frame 5 via a bracket 26, and the main frame 5 connected to the chain 25 is moved in the conveying direction of the sheet pile S by running the chain 25 with the driving force of the electric motor 22. It moves in the direction orthogonal to.

  Hereinafter, the configuration of the first claw driving device 6A and the first claw 7A will be described. Since the second claw driving device 6B and the second claw 7B have the same configuration as the first claw driving device 6A and the first claw 7A (however, they are symmetrical in the front-rear direction in the conveying direction of the sheet pile S), the first claw driving device The parts corresponding to 6A and the first claw 7A are given the same reference numerals or reference numerals in which the alphabet A at the end is replaced with B, and description thereof is omitted.

  As shown in FIGS. 5 and 6, the first claw driving device 6 </ b> A includes a conveyance direction moving frame 30 </ b> A provided to be movable in the conveyance direction of the sheet pile S with respect to the main frame 5, and a conveyance direction moving frame 30 </ b> A. On the other hand, it has an elevating bracket 31A provided so as to be movable up and down, and an arm 32A provided so as to be horizontally movable between a protruding position and a retracted position from the elevating bracket 31A. A claw 7A is attached.

  As illustrated in FIGS. 3 and 4, the transport direction moving frame 30 </ b> A is supported by a pair of upper and lower linear guides 33 provided on the main frame 5 so as to be movable in the transport direction of the sheet pile S. Each transport direction moving frame 30A is provided with a driving device 34A that moves the transport direction moving frame 30A in the transport direction of the sheet pile S.

  As shown in FIGS. 3, 4, and 6, the driving device 34 </ b> A includes a pair of upper and lower racks 35 that extend in parallel with the conveyance direction of the sheet pile S fixed to the main frame 5, and pinions 36 that mesh with the racks 35. And a pinion shaft 37 that rotates integrally with the pinion 36, and an electric motor 38 with a speed reducer that rotationally drives the pinion shaft 37.

  The pinion shaft 37 is rotatably supported by the transport direction moving frame 30A, and the electric motor 38 is also supported by the transport direction moving frame 30A. By rotating the pinion 36 with the driving force of the electric motor 38, the pinion 36 moves in parallel with the conveyance direction of the sheet pile S while meshing with the rack 35, and the conveyance direction moving frame 30A moves with the pinion 36. It has become.

  As shown in FIGS. 5 and 6, the lifting bracket 31 </ b> A is supported by a linear guide 39 provided on the transport direction moving frame 30 </ b> A so as to be movable in the vertical direction. As shown in FIG. 3, the transport direction moving frame 30A is provided with a lifting drive device 40A that moves the lifting bracket 31A in the vertical direction.

  As shown in FIGS. 3 and 4, the elevating drive device 40 </ b> A includes a pair of pulleys 41 that are vertically spaced apart, a transmission belt 42 wound around these pulleys 41, and one pulley 41. It comprises an electric motor 43 that rotates. The transmission belt 42 is connected to the lifting bracket 31A. By causing the transmission belt 42 extending vertically to run with the driving force of the electric motor 43, the lifting bracket 31A connected to the transmission belt 42 is raised and lowered.

  As shown in FIG. 6, the arm 32 </ b> A is supported by a linear guide 44 provided on the elevating bracket 31 </ b> A so as to be movable in a direction perpendicular to the conveying direction of the sheet pile S. Further, the elevating bracket 31A is provided with an advance / retreat driving device 45A for advancing / retreating the arm 32A in a direction orthogonal to the conveying direction of the sheet pile S. The first claw 7A at the tip of the arm 32A faces the lower surface of the sheet pile S) and the retracted position (the position where the first claw 7A at the tip of the arm 32A does not overlap the sheet pile S vertically). It is like that. As the advance / retreat drive 45A, a pneumatic cylinder that expands and contracts with compressed air can be employed.

  As shown in FIG. 8, a horizontal support surface 46 that supports the lower surface of the sheet crest S is provided on the upper surface of the first claw 7A at the tip of the arm 32A. Further, as shown in FIG. 6, the first claw 7A is disposed so as to be shifted toward the transport direction moving frame 30B from the front of the transport direction moving frame 30A, and the second claw 7B is disposed in front of the transport direction moving frame 30B. The first claw 7A and the second claw 7B are arranged so as to be shifted toward the transport direction moving frame 30A, so that the transport direction moving frame 30A, 30B is adjacent to the transport direction moving frames 30A, 30B. It is arranged in front of the middle point of 30B.

  As shown in FIG. 4, a sheet presser 47 </ b> A is provided on the conveyance direction moving frame 30 </ b> A so as to be movable up and down. As shown in FIGS. 5 and 7, the sheet presser 47A is supported by a linear guide 48 provided on the conveyance direction moving frame 30A so as to be movable in the vertical direction. As shown in FIG. 4, the sheet presser 47 </ b> A is connected so as to move integrally with a transmission belt 50 wound around a pair of upper and lower pulleys 49, and drives an electric motor 51 connected to the upper pulley 49. By doing so, the sheet presser 47A is moved up and down.

  The sheet conveying apparatus having the above-described configuration is arranged at the outlet of the sheet stacker on the most downstream side of the corrugator (not shown). The sheet stacker sequentially stacks the cardboard sheets produced by the corrugator, and the cardboard sheets are of a predetermined height (generally about 1.5 m high. This is the height of 300 sheets of A flute cardboard sheets. The sheet pile S is discharged every time it is stacked. The sheet conveying device receives and conveys the sheet pile S discharged from the sheet stacker, and sends it to a storage line (not shown).

  An operation example of the sheet conveying apparatus will be described. First, the operation when the tall sheet pile S reaching a predetermined height is discharged from the sheet stacker (that is, when the stacking operation of the sheet pile S is not performed) will be described.

  As shown in FIG. 1, the upstream conveyor 1 conveys a plurality of sheet piles S discharged from the sheet stacker in an adjacent state via a slitter cutting line L, and keeps the state as it is in the stacked conveying device 2. Send it out. The stacking and conveying device 2 horizontally conveys the plurality of sheet ridges S received from the upstream conveyor 1 without gaps in the conveying direction, and performs the downstream operation in the state without performing the stacking operation of the sheet ridges S. Send to conveyor 3. At this time, each of the divided conveyors 8 is driven so as to continue to convey the sheet pile S horizontally in a state where all the divided conveyors 8 are raised to the raised position. Thereafter, the downstream conveyor 3 receives the sheet pile S discharged from the stack conveying device 2 and horizontally conveys it, and sends the sheet pile S to the storage line. Here, the stack conveyance device 2 simply functions as a normal conveyor that conveys the sheet pile S horizontally.

  Next, an operation when the short sheet pile S that does not reach the predetermined height is discharged from the sheet stacker (that is, when the stacking operation of the sheet pile S is performed) will be described.

  As shown in FIG. 1, the upstream conveyor 1 conveys a plurality of sheet piles S discharged from the sheet stacker in an adjacent state via a slitter cutting line L, and keeps the state as it is in the stacked conveying device 2. Send it out. Here, as shown in FIGS. 9 (a) and 9 (b), the stacking and conveying apparatus 2 is configured so that the first sheet pile S reaches the division conveyor 8 and is below the both ends of the sheet pile S. The division conveyor 8 located outside the lower part is lowered, a space 52 is formed below both ends of the sheet pile S, and the first claw 7A is moved to the space 52.

  Specifically, the lifting bracket 31A is lifted by the lifting drive unit 40A so that the height of the first pawl 7A can be inserted between the conveying surface of the divided conveyor 8 at the lowered position and the lower surface of the sheet crest. The main frame 5 is moved in the direction perpendicular to the conveying direction of the sheet pile S by the main frame driving device 19 with the main frame drive device 19 lowered, and the first claw 7A is moved to the space 52 below the both ends of the sheet pile S. Let At this time, the arm 32A to which the first claw 7A is attached is advanced to the protruding position by the advance / retreat driving device 45A. Further, the transport direction moving frames 30A and 30B are adjacent to each other so that the first claw 7A and the second claw 7B are arranged in a direction orthogonal to the transport direction of the sheet pile S, and the arm 32B to which the second claw 7B is attached is Then, it is moved back to the retracted position by the advance / retreat driving device 45B.

  After the first sheet pile S is transferred from the upstream conveyor 1 to the division conveyor 8, as shown in FIGS. 9 (a) and 9 (b), the upper surface of the first sheet pile S with the sheet pressers 47A and 47B. 10A and 10B, the first claw 7A is raised from the lower side of the first sheet pile S while moving in the same direction as the conveying direction of the sheet pile S on the dividing conveyor 8. As shown in FIG. 4, the lower surface of the first sheet pile S is lifted to a position higher than the upper surface of the second sheet pile S. Here, the division conveyor 8 is driven so as to continue conveying the sheet pile S horizontally without stopping the conveyance of the sheet pile S on the division conveyor 8 even after receiving the first sheet pile S. In order to prevent the first sheet pile S from interfering with the second sheet pile S when lifting the first sheet pile S on the dividing conveyor 8, the first claw 7 </ b> A has the sheet on the dividing conveyor 8. The sheet is moved in the sheet conveying direction at a speed that is the same as or slightly faster than the conveying speed of the mountain S (for example, 100 to 110% of the conveying speed of the sheet mountain S). The speed control of the first claw 7A in the sheet conveyance direction is performed based on a detection signal of a rotation sensor provided on the drive pulley 12 of the division conveyor 8. At this time, the transport direction moving frame 30B is moved integrally with the transport direction moving frame 30A in the sheet transport direction.

  As shown in FIGS. 10A and 10B, after the first claw 7A lifts the lower surface of the first sheet peak S to a position higher than the upper surface of the second sheet peak S, FIG. The first claw 7A is moved in the direction opposite to the conveying direction of the sheet pile S on the dividing conveyor 8 while the first sheet pile S is lifted up as shown by the arrow in FIG. The peak S is positioned directly above the second sheet peak S. The first claw 7A is positioned in the sheet conveying direction based on the detection signal of the rotation sensor provided on the drive pulley 12 of the dividing conveyor 8 and the width dimension of the corrugated cardboard sheet (that is, the length of the sheet pile S in the conveying direction). Based on. At this time, the conveyance direction moving frames 30A and 30B are integrally moved in the conveyance direction of the sheet pile S while maintaining the adjacent state. Thus, immediately after the first sheet pile S is lowered onto the second sheet pile S, the second sheet pile S is lifted by the second claw 7B and stacked on the third sheet pile S. It becomes possible to start.

  Thereafter, as shown in FIGS. 11A and 11B, the lifted first sheet pile S is lowered onto the second sheet pile S on the dividing conveyor 8. In other words, in a state where the first sheet mountain S is located above the second sheet mountain S, the pair of left and right arms 32A are simultaneously retracted by the advance / retreat drive device 45A, so that the first sheet mountain S is removed from the lower surface of the first sheet mountain S. The one claw 7A is retracted, and the first sheet pile S is placed on the second sheet pile S. Until the first claw 7A lowers the first sheet pile S onto the second sheet pile S, the second claw 7B is moved to the space 52 below the both ends of the sheet pile S.

  Here, after the first claw 7A lifts the lower surface of the first sheet pile S, the first claw 7A is lifted by the first claw 7A from when the first sheet pile S is lowered onto the second sheet pile S. Since the inertia force due to the change in the speed in the horizontal direction is applied to the first sheet pile S in the state of being in a state, the balance of the first sheet pile S may be lost. On the other hand, in the stacked conveyance device 2 of this embodiment, after the first claw 7A lifts the lower surface of the first sheet pile S, the first sheet pile S is lowered onto the second sheet pile S. In the meantime, since the upper surface of the first sheet peak S is pressed by the sheet pressers 47A and 47B, it is possible to prevent the balance of the first sheet peak S being lifted by the first claw 7A from being lost. it can.

  Immediately after the first claw 7A lowers the first sheet crest S onto the second sheet crest S, the second claw 7B is moved to the second crest as shown in FIGS. The lower surface of the second sheet mountain S is positioned higher than the upper surface of the third sheet mountain S by being moved up from the lower side of the sheet mountain S while moving in the same direction as the conveying direction of the sheet mountain S on the dividing conveyor 8. Lift up. At this time, the division conveyor 8 continues to convey the sheet pile S horizontally without stopping the conveyance of the sheet pile S on the division conveyor 8 even after the second claw 7B lifts the second sheet pile S. To drive. The second claw driving device 6 </ b> B moves the second claw 7 </ b> B in the sheet conveyance direction at the same speed as or slightly faster than the conveyance speed of the sheet pile S on the division conveyor 8. The speed control of the second claw 7B in the sheet conveyance direction is also performed based on the detection signal of the rotation sensor provided on the drive pulley 12 of the division conveyor 8 as in the first claw 7A.

  After the second claw 7B lifts the lower surface of the second sheet crest S to a position higher than the upper surface of the third sheet crest S, as shown by the arrow in FIG. The sheet pile S of 2 is moved in the direction opposite to the conveying direction of the sheet pile S on the division conveyor 8 while being lifted. At this time, the conveyance direction moving frames 30A and 30B are integrally moved in the conveyance direction of the sheet pile S while maintaining the adjacent state.

  Thereafter, as shown in FIGS. 13A and 13B, the lifted second sheet pile S is lowered onto the third sheet pile S on the division conveyor 8. That is, the second claw 7B is retracted from the lower surface of the second sheet crest S by simultaneously retracting the pair of left and right arms 32B to which the second claw 7B is attached by the advance / retreat driving device 45B. At this time, the first claw 7A is moved by the first claw driving device 6A so that the first claw 7A is disposed in the space 52 below both ends of the sheet pile S. Thus, immediately after the second sheet pile S is lowered onto the third sheet pile S, the operation of lifting the third sheet pile S with the first claw 7A and stacking it on the fourth sheet pile S is performed. It becomes possible to start.

  As described above, the stack conveyance device 2 conveys the first, second, and third sheets while conveying the sheet pile S without stopping the flow of conveyance of the plurality of sheet piles S received from the upstream conveyor 1. The piles S are stacked to form a tall pile, and the pile is sent to the downstream conveyor 3. The downstream conveyor 3 horizontally conveys the tall sheet pile received from the stack conveying device 2 and sends it out to the storage line.

  In the stacking and conveying apparatus 2 described above, the dividing conveyor 8 includes a plurality of dividing conveyors 8 that can move up and down between the rising position and the lowering position. By lowering the dividing conveyor 8 located on the outside of the sheet pile S, it is possible to secure an arrangement space for the first claw 7A and the second claw 7B for lifting the lower surface of the sheet pile S below the both ends of the sheet pile S. . Therefore, it is possible to deal with a plurality of types of sheet piles S having different dimensions, and it is suitable for installation at the exit of a sheet stacker that discharges sheet piles S having different dimensions corresponding to various production lots.

  In addition, the stacked conveying device 2 is configured so that the first sheet pile S is conveyed on the second sheet pile S while conveying the sheet pile S without stopping the flow of the sheet pile S on the dividing conveyor 8. Further, the first and second sheet piles S stacked in the upper and lower directions are conveyed while the sheet pile S is conveyed without stopping the flow of the sheet pile S on the dividing conveyor 8. It is possible to stack on the third sheet pile S. Therefore, the cycle time required for stacking the sheet piles S is short.

  In addition, the stack conveying device 2 performs the stacking operation of the sheet crests S by alternately using the first claws 7A and the second claws 7B, so that the sheet crests S that are continuous for three or more crests also flow in the conveyance. It is possible to stack without stopping.

  By the way, the first claw 7A lifts the lower surface of the first sheet mountain S to a position higher than the upper surface of the second sheet mountain S and then stops the second claw 7A. It is also possible to drive to stand by until the sheet pile S is conveyed by the dividing conveyor 8, but in this case, the second sheet pile is lifted after the first sheet pile S is lifted. The time until it is lowered onto S becomes longer.

  On the other hand, the stack conveying device 2 lifts the lower surface of the first sheet peak S to a position higher than the upper surface of the second sheet peak S with the first claw 7A, and then lifts the first sheet. The direction opposite to the conveying direction of the sheet pile S on the division conveyor 8 is maintained while the first sheet pile S is lifted until the pile S is lowered onto the second sheet pile S on the division conveyor 8. Since the first claw 7A is moved in the direction, the cycle time required for stacking the sheet piles S is short.

  Further, in the stacked conveying device 2, the first claw 7 </ b> A lifts the lower surface of the first sheet mountain S to a position higher than the upper surface of the second sheet mountain S, and then lifts the first sheet mountain S. Since the conveyance distance of the 2nd sheet pile S until it lowers on 2nd sheet pile S is short, it is possible to make the length of the conveyor unit 4 compact. Therefore, it is suitable for installation in a limited space at the exit of the sheet stacker.

  As a method of stacking the first, second, and third sheet piles S, the third sheet pile S is lifted, and the third sheet piles S are stacked in the vertical direction. In this case, when the third sheet pile S is lifted, the height corresponding to the two sheet piles S (the first stacked state) is considered. The total height of the sheet pile S and the second sheet pile S), and the time required to lift the sheet pile S becomes longer.

  On the other hand, the stack conveying device 2 lifts the first sheet mountain S and the second sheet mountain S in the state of being stacked one above the other, and the first sheet mountain S and the second sheet mountain S are Since they are stacked on the third sheet pile S, when the first sheet pile S and the second sheet pile S stacked in the vertical direction are lifted, the height corresponding to the sheet pile S for one step (first 3), the time required to lift the sheet pile S is short. Therefore, the cycle time required for stacking the sheet piles S is effectively short.

  As shown in FIGS. 9 to 13, the first claw driving device 6 </ b> A and the second claw driving device 6 </ b> B are lifted to prevent the balance of the sheet crest S from being lost when the sheet crest S is lifted. Guides 53A and 53B that support the front and back side surfaces of the sheet pile S can be provided. As shown in FIGS. 9A and 9B, the guide 53A has a conveyance direction moving frame in order to prevent the sheet crest S and the guide 53A from interfering when the sheet crest S moves on the dividing conveyor 8. It is provided so as to be movable up and down with respect to 30A.

  By the way, as shown in FIG. 14, when the dimension along the conveyance direction of the sheet pile S is large, if the sheet pile S is lifted only by the pair of first claws 7A, the balance of the lifted sheet pile S is lost, There is a possibility that the lowermost corrugated cardboard sheet of the lifted sheet pile S may be folded at the position of the first claw 7A. Therefore, when performing the reloading operation of the sheet pile S having a large dimension along the conveying direction, as shown in FIGS. 15 to 17, the sheet pile S is formed using both the first claw 7A and the second claw 7B at the same time. Can be lifted.

  That is, the first claw 7 </ b> A and the second claw 7 </ b> B are the same as the conveyance direction of the sheet pile S on the division conveyor 8 from below the first sheet pile S among the plurality of sheet piles S conveyed by the division conveyor 8. By moving up in the direction, the lower surface of the first sheet mountain S is lifted to a position higher than the upper surface of the second sheet mountain S without stopping the conveyance of the sheet mountain S on the dividing conveyor 8, and the lifting is performed. In addition, the first claw 7A and the second claw 7B can be moved so that the first sheet crest S is lowered onto the second sheet crest S on the dividing conveyor 8.

  In this way, since one sheet crest S is lifted by the first claw 7A and the second claw 7B at a position separated along the conveyance direction of the sheet crest S, the dimension along the conveyance direction of the sheet crest S is Even when the sheet pile S is large, the sheet pile S can be lifted stably in a balanced manner, and when the sheet pile S is lifted, the bottom corrugated cardboard sheet can be prevented from breaking.

  In the above-described embodiment, the operation of transferring a plurality of sheet piles to a single sheet pile has been described. However, it is also possible to transfer a plurality of sheet piles to a plurality of sheet piles smaller than the sheet piles. This will be described below.

For example, as shown in FIG. 18, the height of the sheet pile S ₀ which is discharged from the sheet stacker, the normal predetermined height of the sheet pile to be discharged from the sheet stacker (e.g., the A flute cardboard sheet 300 sheets Although not reach the height) of 1.5 m, when the single sheet pile temporarily stacking the sheets mountains S _0, the height of the sheet pile after pile exceeds the predetermined height There are times when it ends.

At this time, the sheet crest S ₀ is divided into small sheet batches S ₁ and S ₂ having a smaller number of sheets than the sheet crest S ₀ , and the sheet crests S ₁ and S ₂ of the respective small batches are stacked. , transshipment operations to reduce the number of sheet mountain S ₀ is possible.

That is, first, as shown in the upper right of FIG. 19, the sheet pile S sheet pile S ₁ of number less small batches than _zero at the time of built up on the sheet stacker to discharge the sheet pile S ₁ from the sheet stacker (the rest of the cardboard sheet, pile up as a new sheet mountain S _2). The height of the sheet pile S ₁ is set to a height not exceeding the predetermined level when the sheet pile S ₁ stacked together. Next, the sheet piles S ₁ of the small batches discharged from the sheet stacker are stacked by the stack conveying device 2 shown in FIG. 1 and sent to the downstream conveyor 3, and then waited on the downstream conveyor 3. At this time, the sheet pile S ₁ on the downstream conveyor 3, as shown in the upper left of FIG. 19, to form a single sheet pile.

Here, the height of each sheet pile S ₁ of small batches, the predetermined height (i.e., normal to the height of the sheet pile to be discharged from the sheet stacker) the number of peaks of the sheet pile S ₁ (Ding-up number) Set the height divided by. Thus, when stacked in transport device 2 stacked sheet pile S ₁ of small batches, the total height of the sheet pile S ₁ after stacking thereof, the sheet pile to be discharged from the sheet stacker normal to the height Can be matched. In other words, the height of the sheet pile sent to the storage line can be made equal to the normal height.

Next, as shown in the bottom right of Figure 19, to discharge the sheet pile S ₂ in the number less small batch than the sheet pile S ₀ from the sheet stacker. The sheet pile S _{2 (i.e.,} the sheet pile sheet pile of the final retail batch when the S ₀ is divided into a plurality of small batches S ₂₎ are matched or even lower the mountains to the height of the sheet pile S ₁ It becomes. Thereafter, the sheet pile S ₂ of small batches discharged from the sheet stacker, feeding downstream conveyor 3 are stacked in the conveying apparatus 2 stacks shown in FIG. 1, is incorporated into the sheet pile S ₁ to wait on the downstream side conveyor 3 . Finally, downstream conveyors 3, as shown in the lower left of FIG. 19, the sheet pile and a single sheet mountain S ₁ is formed by stacked sheet pile S ₂ is a single sheet thread formed stacked Are sent to the storage line in an adjacent state.

As described above, the sheet pile S ₀ shown in FIG. 18, as shown on the right side of FIG. 19, divided into sheet pile S ₀ sheet pile of sheets less small batches than S _1, S ₂ the stacking conveyor By feeding into the apparatus 2, it is possible to transship to a plurality of sheet piles (see the lower left in FIG. 19) which is smaller than the number of sheet piles S ₀ shown in FIG. 18.

2 Stack conveying device 4 Conveyor unit 6A First claw driving device 6B Second claw driving device 7A First claw 7B Second claw 8 Dividing conveyor 52 Space S Sheet pile

Claims (6)

A conveyor unit (4) for horizontally conveying a plurality of sheet piles (S) arranged without gaps in the conveying direction in a state where spaces (52) are formed below both ends of the sheet pile (S);
A pair of first claws (7A) disposed in the space (52) below both ends of the sheet pile (S) conveyed by the conveyor unit (4);
The pair of first claws (7A) is placed on the conveyor unit (4) from below the first sheet pile (S) among the plurality of sheet piles (S) conveyed by the conveyor unit (4). The sheet pile (S) on the conveyor unit (4) is conveyed by moving the sheet pile (S) in the same direction as the sheet pile (S) while moving at a speed equal to or faster than the sheet pile conveyance speed. Without stopping, the lower surface of the first sheet pile (S) is lifted to a position higher than the upper surface of the second sheet pile (S), and the raised first sheet pile (S) is placed on the conveyor unit (4). A first claw driving device (6A) for moving the pair of first claws (7A) so as to descend on the second sheet pile (S) of
A stacking and conveying apparatus for sheet piles.   The pair of first claws (7A) lifts the lower surface of the first sheet mountain (S) to a position higher than the upper surface of the second sheet mountain (S), and then lifts the first sheet mountain (S) On the conveyor unit (4), the first sheet pile (S) is lifted until S) is lowered onto the second sheet pile (S) on the conveyor unit (4). 2. The stacking and conveying apparatus for stacking sheets according to claim 1, wherein the stacking and conveying apparatus for stacking sheets is driven by the first claw driving device (6 </ b> A) so as to move in a direction opposite to the conveying direction of the sheet stack (S). The pair of first claws (7A) are configured to be movable independently of each other, and are disposed in the space (52) below both ends of the sheet pile (S) conveyed by the conveyor unit (4). A pair of second nails (7B);
Immediately after the pair of first claws (7A) lowers the first sheet pile (S) onto the second sheet pile (S), the pair of second claws (7B) is moved to the second sheet. By moving upward from the lower side of the ridge (S) in the same direction as the conveying direction of the sheet ridge (S) on the conveyor unit (4) while moving at a speed equal to or faster than the conveying speed of the sheet ridge, Without stopping the conveyance of the sheet pile (S) on the conveyor unit (4), the lower surface of the second sheet pile (S) is lifted to a position higher than the upper surface of the third sheet pile (S), and the raised first A second claw driving device (6B) for moving the pair of second claws (7B) to lower the second sheet crest (S) onto a third sheet crest (S) on the conveyor unit (4) When,
The sheet pile stacking and conveying apparatus according to claim 1, further comprising:   The pair of second claws (7B) lifts the lower surface of the second sheet peak (S) to a position higher than the upper surface of the third sheet peak (S), and then lifts the second sheet peak ( On the conveyor unit (4), the second sheet pile (S) is lifted until S) is lowered onto the third sheet pile (S) on the conveyor unit (4). The stack conveyance apparatus of a sheet pile of Claim 3 driven by the said 2nd nail | claw drive device (6B) so that it may move to the direction opposite to the conveyance direction of a sheet pile (S).   When the pair of second claws (7B) lowers the second sheet pile (S) onto the third sheet pile (S), the pair of first claws (7A) 5. The sheet pile stacking and conveying apparatus according to claim 3 or 4, which is driven by the first claw driving device (6A) so as to be positioned below both ends of the upper third sheet pile (S).   The conveyor unit (4) includes a plurality of divided conveyors (8) arranged in a direction orthogonal to the conveying direction of the sheet pile (S), and each of the divided conveyors (8) is formed on the lower surface of the sheet pile (S). It is configured to be movable up and down between a raised position where the conveying surface comes into contact and a lowered position where the conveying surface is separated from the lower surface of the sheet crest (S), and both ends of the sheet crest (S) among the divided conveyors (8). The sheet according to any one of claims 1 to 5, wherein the space (52) is formed below both ends of the sheet pile (S) by lowering the dividing conveyor (8) positioned below and outside the sheet portion. Pile stacking device.

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