JP2005145679A - Multiple stacking device of box-like workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize and increase the speeds of a multiple stacking operation and a delivering operation in a multiple stacking device of box-like workpieces. <P>SOLUTION: In this device, each of a pair of rotary shafts 12B arranged with an erection attitude is provided with a feed-down unit 12 mounted with a plurality of blades 12A maintaining a predetermined vertical interval and a predetermined phase angle in the radial direction. The box-like workpieces W continuously supplied onto a pair of facing blades 12A at the highest position are stacked by synchronously driving the rotary shafts 12B in a pair of feed-down units 12 to sequentially move the phases of the blades under the box-like workpieces W. By receiving a following box-like workpieces W on the received box-like workpieces W while feeding down the box-like workpieces W received by the blade 12A at the upper position to the lower-stage blade 12A, the stacking operation is performed. The stacked box-like workpieces W are delivered downward from the blade 12A at the lowest position by the same operation as the stacking operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an automatic packaging line for box-shaped workpieces in which box-shaped workpieces stacked in several upper and lower stages or several upper and lower stages are packed in a packaging box such as a cardboard box, and the box-shaped workpieces are vertically moved. The present invention relates to a stacking apparatus for box-shaped workpieces in charge of stacking an arbitrary number of stages.

  Box-shaped workpieces (referred to as cubes or rectangular parallelepiped workpieces, products, packaging articles, etc .; the same shall apply hereinafter) in the distribution process prior to the retail stage are handled as a single package that is easy to handle depending on size, price, etc. Distributes in units. When packaging a large number of box-shaped workpieces that constitute a transaction unit in a single packaging box, in general, a large number of boxes that are packaged items can be used so that a packaging box with a minimum volume can be used. The vertical and horizontal arrangements of the workpieces are considered. The box-shaped workpiece stacking apparatus mechanically realizes the vertical alignment of the vertical and horizontal alignments, that is, the vertical stacking operation.

  The box-shaped workpiece stacking device includes a large number of aprons that are attached at regular intervals, and is provided with a pair of conveyance chains that circulate in synchronization with the vertical direction. The applicant of the present invention has already proposed a stacking apparatus in which box-shaped workpieces are sequentially supplied onto aprons at corresponding positions while lowering the apron (Patent Document 1).

JP 2003-137431 A

  As shown in FIG. 11, in this stacking apparatus, the apron 41 in each transport chain CH having a predetermined length in the vertical direction is perpendicular to the traveling direction of the transport chain CH, that is, the transport chain CH is in the vertical direction. A plurality of aprons 41 in each transport chain CH are attached so as to be in a horizontal posture when facing, and the size of the article B that is planned to be handled and the number of stacked stages of articles (five stages by five box-shaped works) ) Are arranged at regular intervals set in accordance with. In addition, each pair of transport chains CH is arranged in a pair on the left and right sides, but the apron 41 at the corresponding position in the pair of transport chains CH maintains a posture in which the apron 41 faces a straight line at the same vertical position. Descend.

  Articles B (B1, B2, B3, B4, B5) to be stacked are supplied for each predetermined number of stacked aprons 41 at a predetermined supply position for each pair of aprons 41 that descend while maintaining the facing posture. 20 and 30 are continuously supplied. That is, each pair of aprons 41 facing each other performs a stacking operation in the vertical direction by receiving the next article B on the article B sequentially received while being lowered. In addition, the supply timing of the article B between a plurality of pairs of aprons 41 that are vertically positioned in a pair of transport chains CH is not continuously but is intermittently supplied for each stacked number. For example, when five articles B (B1, B2, B3, B4, B5) are continuously supplied to a pair of aprons 41, the supply of the article B is temporarily stopped, and then the next rank 1 The next five articles B (B1, B2, B3, B4, B5) are continuously supplied while waiting for the pair of aprons 41 to arrive at a predetermined supply position.

  The articles B, B... That have been stacked are pushed out from the apron 41 by the pusher device 50 in the order of stacking completion. The pusher device 50 is a device whose operation content is to reciprocate the pusher plate 51 toward the side. The pusher device 50 passes only the product B mounted on the apron 41 via the pusher plate 51 while avoiding interference with the apron 41 at the timing when the apron 41 that is loaded and lowered with the product B passes through the front surface of the pusher device 50. Act to stick out. The vertical intervals of the plurality of aprons 41 are set as intervals at which the operated pusher plate 51 returns to the original position and the discharging operation can be repeated in the same order for the aprons 41 of the next rank.

  In the above-described conventional multi-stage stacking apparatus 102, the discharge of the articles B, B... That have been stacked on the pair of aprons 41 is performed by the pusher apparatus 50 whose operation is a reciprocating motion. And since it is necessary to return the pushed pusher device 50 to the original position without interfering with the articles (box-shaped workpieces) B stacked on the apron 41 of the next rank, the vertical intervals of the plurality of aprons 41 are: It cannot be kept below a certain level. This is because if the interval between the upper and lower aprons 41 is reduced beyond a certain limit, the apron 41 of the next rank that has been lowered to the pusher device 50 that is returning to the original position collides. It is also difficult to increase the speed of the transport chain CH that circulates and drives the apron 41. This is because speeding up the transport chain CH is equivalent to setting the apron 41 at a narrower vertical distance in relation to the pusher device 50. For this reason, it is necessary to provide a sufficient gap between the pair of aprons 41 and the next pair of aprons 41 for each stack unit of the five articles B (B1, B2, B3, B4, B5). Therefore, since the height of the device 50 has to be sufficiently secured, the device has to be large.

  As a result, in the conventional multi-stage stacking apparatus 102, the vertical interval of the apron 41 in the transport chain CH cannot be reduced because it is necessary to ensure the operation period of the pusher apparatus 50 in consideration of safety. Performance of the apparatus (peripheral device) installed in the apparatus, for example, supply devices 20 and 30 for supplying the article B to the multi-stage stacking apparatus 102, a transport apparatus for transporting the article B discharged from the multi-stage stacking apparatus 102 to the next process, etc. There was a problem that it was not possible to fully exhibit. That is, even if the supply devices 20 and 30 have a sufficiently high article supply capability, their original performance must be narrowed down and used so as to be suitable for the intermittent operation of the multistage stacking device 102. For example, the article B (B1, B2, B3, B4, B5) raised to the height of the relay conveyor 210 by the first transfer conveyor A21 is stacked on the transfer conveyor 210 as the supply devices 20 and 30. Since it becomes necessary to set the space | interval D2 for every, the apparatus which opens the space | interval in the predetermined space | interval D2 for every multistage stack unit is needed. In the conventional apparatus, the driving speed V2 of the conveyor belt 217 of the transfer conveyor 210 is set lower than the driving speed V1 of the conveyor belt of the first transfer conveyor A21, and the conveyor belts 31, 31 of the pitcher conveyor 30 The driving speed V3 is set to be relatively higher than the driving speed V2 of the relay conveyor 210 (V1> V2 <V3). In the conventional apparatus, the fall timing (operation timing) between the apron 41 that is circulated and the supply apparatuses 20 and 30 must be set in consideration of the fall distance and the like. Such a problem can also be pointed out with respect to the conveying device A2 and the like that are placed behind the multi-stage stacking device 102.

  Therefore, an object of the present invention is to request an intermittent operation that is not essential for the article supply device and the conveyance device installed before and after the multi-stage stacking device by increasing the speed and speed of the operation of the multi-stage stacking device. It is an object of the present invention to provide a box-shaped workpiece stacking apparatus that can effectively use these performances without any unnecessary peripheral devices that require precise setting for each multi-stacking unit.

  A box-shaped workpiece stacking apparatus according to claim 1 of the present application is provided with a plurality of blades that sequentially receive and support box-shaped workpieces continuously supplied from a supply conveyor, and a rotary shaft that rotates a plurality of blades. A pair of units are arranged on the left and right, and a plurality of blades in each of the pair of lowering units are arranged in stages while maintaining a predetermined vertical distance, and from the upper blade to the lower blade in the rotational direction. A pair of left and right lifting units are sequentially supplied onto a pair of left and right blades facing each other between a pair of rotating shafts, with the phases being sequentially delayed toward each rotating shaft. The box-shaped workpiece is moved down to a pair of left and right blades facing each other in turn by rotation of a pair of rotating shafts.

  According to the present invention, the plurality of blades on the pair of rotating shafts are arranged stepwise while maintaining a predetermined vertical distance. Therefore, if the heights of the blades at the upper position on the pair of rotating shafts are set to be the same, the vertical positions of the corresponding blades at the lower position are also the same. In addition, the plurality of blades attached to each rotation shaft are sequentially delayed in phase by an equal angle in the rotation direction. Therefore, when the pair of rotating shafts are driven synchronously, the pair of rotating shafts rotate at a predetermined phase angle after the pair of blades in the upper position face each other between the pair of rotating shafts. The pair of upper left and right blades eliminates the facing posture, and completes the posture in which the next pair of left and right blades face each other between the pair of rotating shafts.

  Here, it is assumed that six blades are attached to each pair of rotating shafts, the phase angle between the upper and lower blades is set to 72 degrees, and the phase angle of the lowermost blade is delayed by 360 degrees with respect to the uppermost blade. In other words, at the timing when the pair of left and right blades at the upper position face each other, the first of the box-shaped workpieces continuously supplied between the pair of rotating shafts is explained. One is received by a pair of left and right blades in the upper position, and is supported at the height of the blade. Here, when the phase of the rotating shaft advances by 72 degrees, a pair of left and right upper blades supporting the box-shaped workpiece come out from below the box-shaped workpiece, and the box-shaped workpiece falls. At this time, a pair of left and right blades in the lower position at the same time are in a position facing each other below the box-shaped workpiece, and receive the box-shaped workpiece that has dropped. The next-order box-shaped workpieces that are continuously supplied fall so as to overlap the box-shaped workpieces that have fallen in the previous rank at this timing, and are in a two-tiered state.

  When the phase of the pair of rotating shafts further advances while maintaining such an operation, the second stage blade that supports the two-stage stacked box-shaped work moves from the bottom of the box-shaped work in the direction of phase advancement. The box-shaped workpiece falls while maintaining a two-tiered state. Under the present circumstances, the operation | movement which takes the attitude | position which the braid | blade of the 3rd step from the top faces between a pair of rotating shafts under the box-shaped workpiece | work falling is completed. Accordingly, the two box-shaped workpieces that fall are received by the third-stage blade from the top, and the third box-shaped workpiece is supplied onto the two box-shaped workpieces received at the same time. Will be in a three-tiered state.

  Similarly, the fourth box-shaped workpiece continuously supplied is in a four-stage stacked state on the fourth-stage blade according to the operation content. The same applies to the box-shaped workpiece supplied to the fifth piece. At this time, the uppermost pair of blades are in a posture to face each other, and therefore the box-shaped workpiece supplied to the sixth piece is not on the box-shaped workpiece stacked in five stages, but a new stage. It is received by the uppermost blade as the first box-shaped workpiece of the stacking cycle.

  Next, when the phase of the rotating shaft further advances by 72 degrees, the pair of blades supporting the box-shaped workpiece in a five-layered state escapes from the lower side of the box-shaped workpiece while eliminating the facing posture. Falls on the sixth stage blade in a five-tiered state, and at the same time, the box-shaped workpiece on the uppermost blade is received by the second stage blade that has completed the facing posture between the rotation axes. The stacking operation proceeds. The five-step stacked box-shaped workpiece dropped on the sixth-stage blade is free from the seventh-stage blade, so that it falls under the lowering unit due to natural fall, that is, without requiring a special discharge device and discharge process. To be discharged. The carry-down unit can thus simultaneously execute the stacking operation and the discharging operation. On the other hand, if the multi-stage state of five-stage stacking is repeatedly obtained, the first stage of the next five-stage stacking is the state when the uppermost left and right blades 12A make one rotation and enter the next rotation. Receive and support the first stage. Then, the above operation is repeated.

  A box-shaped workpiece stacking device according to claim 2 of the present application is provided with a guide cylinder disposed between the rotation shafts of the pair of left and right lifting units on the basis of the invention according to claim 1, and the guide cylinder Has a plurality of slits through which a plurality of blades of a pair of lowering units pass, and an upper opening for feeding the box-shaped workpiece, a lower opening for discharging the box-shaped workpiece, The lowering unit is characterized in that the lowering operation of the box-shaped workpiece is executed in the guide cylinder by a blade that sequentially passes through the plurality of slits.

  According to the present invention, the guide cylinder is formed with the slits for allowing the blades of the pair of lowering units to pass therethrough, so that the blades in the pair of rotation shafts do not interfere with the guide cylinder. An operation of turning around is possible. In other words, the box-shaped workpieces continuously fed from the upper opening are stacked while the horizontal position of the box-shaped workpiece is regulated by the guide cylinder within the range in the guide cylinder. Is prevented, and the discharge position of the stacked box-shaped workpieces can be made constant.

  The box work stacking device according to claim 3 of the present application is based on the invention of claim 1 and each blade in the lowering unit is finished with different frictional forces on the front and back surfaces, A notch communicating with the outer peripheral portion from the central hole for inserting the rotating shaft is formed.

  According to the present invention, the notch of each blade is used to remove the rotating shaft from the center hole of the blade and replace it with a blade having a different shape, or the work can be easily reversed and attached to the rotating shaft. it can. Also, since the front and back surfaces have different frictional forces, the appropriate front and back surfaces of the blades correspond to the frictional force generation conditions such as the weight of the box-shaped workpieces to be stacked, the surface mode, and the type of packaging. Can be selected and used, and a more neat stacking posture can be realized.

  According to claim 4 of the present application, on the premise of the invention according to claim 1, each blade in the carry-down unit is configured such that each blade has a small rotation radius of the blade around the rotation axis and rotation of the blade. As the rotary shaft rotates, the portion where the blade rotation radius is small is lower than the portion where the blade rotation radius is large. It is characterized by getting out of it.

  The box-shaped workpiece supported by the blades of the lowering unit can fall in the correct posture when the blade that swivels along with the rotation of the rotating shaft has completely pulled out from under the box-shaped workpiece. In order to escape from the bottom of the box-shaped workpiece while the blade is stopped at the position where the blade supports the box-shaped workpiece, that is, to let the blade escape using the stationary inertia of the box-shaped workpiece. It is necessary to make the period during which the frictional force acts between the box-shaped workpiece and the blade be as short as possible and to escape at once. According to the present invention, the shape of the blade is changed so that the portion where the rotational speed is relatively slow around the rotation axis, that is, the portion where the blade rotation radius is small is ahead of the portion where the blade rotation radius is large. Since the part that remains at the bottom of the box-shaped workpiece can be the part where the blade speed is fast, by letting the blade escape from the bottom of the box-shaped workpiece at a high speed, It is possible to prevent the box-shaped workpiece from being displaced in the moving direction of the blade accompanying the blade.

  The box work stacking apparatus according to claim 5 of the present application is based on the invention of claim 1, and the rear edge of each blade in the lowering unit is moved from below the box work in accordance with the rotation of the rotating shaft. It is characterized in that it is formed into a shape that follows the outer shape of the box-shaped workpiece when it is pulled out.

  According to the present invention, the blade that swivels below the mounted box-shaped workpiece enters the lower portion of the box-shaped workpiece from the front edge, which is the moving direction of the blade, and the rear edge is limited from below the box-shaped workpiece. Get out. At this time, a situation in which a part of the blade escapes from below the box-shaped workpiece and a part of the blade remains under the box-shaped workpiece at that time causes the posture of the box-shaped workpiece to collapse. Therefore, if the rear edge of the blade is formed in a shape that conforms to the outer shape of the box-shaped workpiece, the entire rear edge of the blade is positioned below the box-shaped workpiece in terms of whether or not it overlaps with the box-shaped workpiece. Alternatively, it is possible to perform a clear and alternative operation of whether or not the whole is located below the box-shaped workpiece, and to minimize the posture collapse of the box-shaped workpiece due to the influence of the blade turning motion. it can.

  A box-shaped workpiece stacking apparatus according to claim 6 of the present application is based on the invention of claim 1 and is connected to the supply conveyor to receive articles from the supply conveyor and put them into a dispensing position of a predetermined height. The supply conveyor includes a pitcher conveyor that ejects articles and an intermittent storage shutter device that intermittently forcibly stops the articles that are sequentially conveyed to the supply conveyor without stopping the supply conveyor and stores a plurality of articles and then opens the supply conveyor. And the drive speed of the conveyor belt of the pitcher conveyor is set to be relatively large with respect to the drive speed of the conveyor belt of the supply conveyor.

  According to the present invention, the supply conveyor aligns the articles sequentially conveyed from the transfer conveyor into a multi-stack unit group, and the pitcher conveyor performs a dispensing operation for each multi-stack article group. The dispensing operation at this time is set so that the driving speed of the conveyor belt of the pitcher conveyor is relatively higher than the driving speed of the conveyor belt of the supply conveyor. Supplied to the stacking equipment. It should be noted that a detection sensor for detecting that the uppermost blade of the box-shaped workpiece stacking device has come to a position where the box-shaped workpiece from the supply conveyor can be mounted is disposed, and the shutter of the shutter device for intermittent storage is arranged. It is also possible for the board to be released.

  The box-shaped workpiece stacking device according to the present invention sequentially delays the phase angle of each of a pair of rotating shafts arranged in parallel in an upright posture with respect to the rotational direction of the rotating shaft, A pair of lowering units arranged so as to maintain a vertical distance between them, and a box-shaped work is continuously supplied onto a pair of blades facing each other at the uppermost position of the pair of lowering units, and a pair of rotating shafts Are driven synchronously in the opposite direction, the blade phase is sequentially moved downward to the box-shaped workpiece, and the box-shaped workpiece is lowered downward step by step while the next rank is placed on the box-shaped workpiece supplied in the previous order. It is no longer necessary to stack the box-shaped workpieces and set the interval for each multi-stack unit. That is, it is possible to increase the speed and speed of the stacking operation and the discharging operation. Further, since the box-shaped workpieces that have been stacked can be discharged downward from the lowermost blade by a natural drop, it is no longer necessary to install a special discharge device and to secure a discharge process. Furthermore, the original performance is exhibited in the peripheral devices installed before and after the stacking device, and it becomes possible to eliminate the need for an extra peripheral device that is set for each multi-stacking unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
The box-shaped workpiece stacking apparatus 10 according to the present invention includes a supply conveyor A for a box-shaped workpiece W placed upstream on the upstream side of a box-shaped workpiece automatic packing line, and a boxing device C placed downstream on the downstream side. (Fig. 1). Note that the box-shaped workpiece W shown in the following figures is a parcel type in which 10 packs of ordinary 20 cigarettes are packed in paper (from December 1999, a conventional paper box from the viewpoint of resource protection). To a wrapping paper called “Parcel type”). However, regarding the range of the box-shaped workpieces W that can be handled by the box-shaped workpiece stacking apparatus 10, there is generally no limitation beyond that the shape and size are maintained within a certain range. The description will be made assuming that the box-shaped workpiece W is repeatedly obtained in a multi-stage state in which the box-shaped workpieces are stacked in five stages (5 stages as one unit).

  An automatic packing line for box-like workpieces is usually composed of a number of devices that are responsible for different actions that are ultimately directed to a common purpose. Here, as a range related to the present invention, an outline from the supply conveyor A to the boxing device C constituting the device group is shown in FIG. On the other hand, the box-shaped workpieces W are sorted by an upstream device group (not shown) and sent downstream, and the supply conveyor A receives this and supplies it to the stacking device 10. The supply conveyor A is operated at a lower speed than the step-up conveyor A1 that raises the box-shaped workpieces W to the position where the box-shaped workpieces W are supplied to the stacking device 10, and gradually moves while conveying the raised box-shaped workpieces W1. From the low-speed conveyor A2 to be stored, and the high-speed conveyor A3 that is operated at a higher speed than the step-up conveyor A1 and supplies the box-shaped workpiece W received from the low-speed conveyor A2 so as to be thrown out onto the stacking device 10 from the downstream end. Become.

  Here, the number of box-shaped workpieces W that the high-speed conveyor A3 supplies to the stacking device 10 per unit time is the same as the number of box-shaped workpieces W that the step-up conveyor A1 receives from the upstream side per unit time. Yes, the three conveyor devices as a whole have the effect of converting the vertical position of the box-shaped workpiece W received from upstream, and the operation of converting the throwing speed when supplying the box-shaped workpiece W to the stacking device 10. It is in charge. Then, the stacking apparatus 10 stacks the supplied box-shaped workpieces W every predetermined number, and sequentially discharges the completed stacking onto the discharge conveyor 20.

  The discharge conveyor 20 is a special conveyor devised so that it can be conveyed while maintaining the stacked state of the stacked box-shaped workpieces W. On the side of the discharge conveyor 20, a conveyance conveyor B leading to the boxing device C is arranged in parallel, and the discharge conveyor 20 transfers the box-shaped workpiece W received from the stacking device 10 to the conveyance conveyor B via the connection slider 20 </ b> A. Transfer sequentially to the side. At this time, an empty case 20B for maintaining the stacked state of the box-shaped workpieces W is prepared on the transport conveyor B side, and the box-shaped workpieces W are stored in the case 20B in units of stacking. It moves on the conveyor B in the state.

  The boxing device C includes a box control device C2 that controls the empty packaging box C1 so as to move along a predetermined path, and a pusher device C3 that pushes the box-shaped workpiece W on the transport conveyor B into the empty packaging box C1. It is installed along the downstream part of the conveyor B. The box control device C2 positions the opening of the empty packaging box C1 toward the transport conveyor B, and the pusher device C3 stands by at a position opposite to the transport conveyor B. The box-shaped workpieces W are subjected to width alignment processing in units of several rows including the case 20B in the downstream portion of the transfer conveyor B. For example, a total of 25 boxing units are formed in five rows on the top and bottom and five rows on the left and right. At this timing, the pusher C3 pushes only the box-shaped workpiece W into the packaging box C1 from the opposite side of the conveyor B, and an empty case 20B remains on the conveyor B.

  Note that elevator devices E1 and E2 are installed at the upstream end and the downstream end of the conveyor B, respectively, and the two elevator devices E1 and E2 are installed above the conveyor along the conveyor B. Has been contacted by. And the empty case 20B which became surplus in the downstream part of the conveyance conveyor B returns to the upstream side of the conveyance conveyor B by cooperation with elevator apparatus E1, E2 and a return conveyor, and is used repeatedly.

  The box-shaped workpiece stacking apparatus 10 installed in the automatic packing line for box-shaped workpieces is extremely simple by paying attention to the static inertia of the object and the natural falling action due to its own weight, and using them in combination. The stacking operation and the discharging operation of the box-shaped workpieces W with a simple machine configuration are realized. The stacking apparatus 10 employs a configuration in which the box-shaped workpieces W move downward from above in order to use natural fall, and the supply conveyor A that supplies the box-shaped workpieces W to the stacking apparatus 10 includes It arrange | positions so that a downstream end may adjoin the upper part of the stacking apparatus 10. FIG. Further, the discharge conveyor 20 is arranged so that its upstream end overlaps below the stacking device 10 (FIGS. 2, 3, and 4). That is, the arrangement is made in consideration of the supply position and the discharge position of the box-shaped workpieces W with respect to the stacking apparatus 10.

  The stacking apparatus 10 includes a skeleton frame 11 formed by combining a vertical column member 11A and a horizontal plate 11B. Four support members 11A are arranged in a distributed manner on the left and right with the center position of the apparatus as the center, and the horizontal plate 11B is horizontally arranged in the vertical direction. Of the plurality of horizontal plates 11B, the horizontal plate 11B attached to the upper end of the column member 11 forms the top plate of the frame frame 11, and the horizontal plate 11B attached to the lower end of the column member 11A serves as the bottom plate of the frame frame 11. Forming. Mechanical legs g having an adjusting function are attached to the four corners of the bottom plate. On the other hand, the horizontal plate 11 </ b> B disposed at an intermediate position of the column member 11 </ b> A is used as an attachment member for main machine elements constituting the stacking device 10.

  The frame 11 is assembled with a pair of lowering units 12 that are arranged side by side with a fixed distance from the center position. Each carry-down unit 12 includes a rotary shaft 12B that is rotatably supported by supporting two upper and lower portions by bearings disposed at corresponding positions on the upper and lower horizontal plates 11B, and six blades that are attached to the rotary shaft 12B. 12A is a main member.

  The upper ends of the pair of rotating shafts 12B in the pair of carry-down units 12 are extended to the upper surface of the immediately above horizontal plate 11B, and the pair of rotating shafts 12B are driven to rotate on the horizontal plate 11B. A drive motor M and the like are accommodated. The pair of rotating shafts 12B are always synchronously driven in opposite directions regardless of the rotation direction of the output shaft of the drive motor M. That is, the intermediate shaft 12E is provided adjacent to one of the pair of rotating shafts 12B, and the drive motor M is directly connected to the other rotating shaft 12B. A dedicated pulley 12C is attached to the rotating shaft 12B and the intermediate shaft 12E connected to the drive motor M, and the rotating shaft 12B and the intermediate shaft 12E are connected by a timing belt 12D hung between the pulleys 12C. Has been. A gear 12F that meshes with a gear ratio of 1: 1 is attached to the intermediate shaft 12E and the other rotating shaft 12B. The rotation transmission ratio between the rotating shaft 12B and the intermediate shaft 12E via the timing belt 12D is 1: 1. Therefore, for example, when one rotating shaft 12B rotates once in the clockwise direction, the other rotating shaft 12B rotates once in the counterclockwise direction.

  Six blades 12A are attached to the pair of rotating shafts 12B in the radial direction. Each blade 12A is a plate-like body formed by shaping a thin metal plate into a special shape, and the shape of the six blades 12A is the same. Each blade 12A is screwed to a flange 12G fixed in advance to the rotary shaft 12B, and can be remounted by inverting the front and back by removing the screw. In order to enable this reversal operation, each blade 12A is formed with a notch f that communicates with the outer periphery from a central hole e through which the rotary shaft 12B is inserted (FIG. 6A). Note that the front and back surfaces of each blade 12A have different surface finishes mainly for the purpose of different frictional forces when in contact with other objects. Surface finishing includes means such as polishing, painting, coating, corrosion, blasting, and sheet member sticking.

  Regarding the shape of each blade 12A, there is a requirement that the box-shaped workpiece W can be stably supported, and the influence of the turning motion of the blade 12A on the supported box-shaped workpiece W should be small. It is considered as a shape that meets the requirements. Such determination of the shape of the blade 12A has many parts depending on the relationship with the properties of the box-shaped workpiece W to be handled, including the problem of the surface finish of the blade 12A.

  The blade 12A as satisfying such a requirement is, for example, asymmetric with respect to the center line CL passing through the rotation shaft 12B, and the protrusions a and b are arranged near the front edges of the front edge F1 and the rear edge F2 in the rotation direction K2. At the same time, a notch c is formed inside the protrusion b of the rear edge F2, that is, in a portion having a small rotation radius centered on the rotary shaft 12B (FIGS. 5 and 6A). The blade 12A having an outer peripheral shape formed by combining the projecting portions a and b and the notch portion c has a box shape in which the portion where the rotation radius of the blade 12A is small around the rotation shaft 12B is larger than the portion where the rotation radius of the blade 12A is large. It can be said that it is a shape that can be pulled out from below the workpiece W. In addition, the rear edge F2 of each blade 12A is within the range of the length of each blade 12A, particularly in the shape of the projecting portion b, when it comes off from below the box-shaped workpiece W as the rotating shaft 12B rotates. It can be said that it is formed in a shape that follows the outer shape of the box-shaped workpiece W (FIG. 6A).

  The six blades 12A in each pull-down unit 12 are arranged in stages while maintaining an equal vertical spacing with respect to the rotating shaft 12B, and the blades 12A arranged in stages are formed on the box-shaped workpiece W. With respect to the rotation directions K1 and K2 of the pair of rotation shafts 12B and 12B determined by the relationship between the type and the supply direction K0, the phase is sequentially delayed by θ = 72 degrees from the upper position to the lower position. It is attached. Therefore, the lowermost blade 12A is oriented in the same direction as the uppermost blade 12A with a 360 degree phase delay (FIGS. 2 and 5). Here, the angle of each of the six blades 12A can be adjusted to a predetermined angle. That is, as shown in FIGS. 6B and 6C, a mounting flange 12G is disposed above each blade 12A, an adjustment base 12H is disposed below, and the adjustment base 12H is provided on the adjustment base 12H. The adjusting bolt BB is screwed in the direction of the rotating shaft 12B. When the adjusting bolt BB is tightened, the blade 12A is fixed to the rotating shaft 12B, and when loosened, the blade 12A is fixed to the rotating shaft 12B. The angle with respect to can be adjusted. The flange 12G and the adjustment base 12H are screwed via a blade 12A. Further, the vertical distance between the six blades 12A is adjusted along the rotary shaft 12B according to the size of the box-shaped workpiece W to be handled and the required number of stacked stages by the adjusting base 12H and the adjusting bolt BB.

  Between the pair of lowering units 12, openings 13A and 13B are provided at the top and bottom, and a guide tube 13 formed in a square tube shape as a whole is installed (FIGS. 2, 3, and 5). The guide cylinder 13 is intended to control the horizontal position of the box-shaped workpiece W when moving in the vertical direction via the lowering unit 12 and the posture at that position. The upper opening 13A of the guide cylinder 13 is a box The workpiece W is loaded, and the lower opening 13B is for discharging the box-shaped workpiece W. Therefore, the planar shape of the guide cylinder 13 is similar to the planar shape of the box-shaped workpiece W in the loading posture, and the dimensions of the upper and lower openings 13A and 13B are taken into consideration in the dimensional variation of the box-shaped workpiece W. Is set to be slightly larger than the planar shape (FIG. 5). However, it is sufficient that the guide cylinder 13 has an inner peripheral shape that follows the outer peripheral shape of the various box-shaped workpieces W to be charged. The guide cylinder 13 is not limited to a rectangular shape, and has only a corner portion. The guide tube 13 may be used.

  Here, a plurality of slits d through which the blades 12A of the lowering unit 12 located on both sides pass are provided on the side surfaces of the four circumferences of the guide tube 13, and the blades 12A pass through the slits d to pass through the guide tube. Regardless of the presence of 13, it is possible to perform a turning motion around the rotating shaft 12B. The height of the guide cylinder 13 reaches at least the entire attachment range of the blade 12A in the lowering unit 12, and it is possible to regulate only the box-shaped workpiece W without hindering the operation of the pair of lowering units 12. is there.

  The discharge conveyor 20 circulates and drives a conveyor belt 22 hung between conveyor rolls 21 arranged at the upstream end and the downstream end, and conveys the box-shaped workpiece W discharged below the lowering unit 12 to the next process. Yes (Figs. 2, 3 and 4). On the conveyor belt 22, a large number of flaps 23 are disposed in the width direction of the conveyor belt 22 to restrain the stacked box-shaped workpieces W so as not to collapse. Each flap 23 is a plate-like body provided with a taper in a direction in which the thickness of the distal end portion 23 a is smaller than the thickness of the base portion 23 b, and the numerous flaps 23 are evenly spaced with respect to the length of the conveyor belt 22. It is allocated and arranged. Therefore, the interval between the adjacent flaps 23 is constant at any position of the conveyor belt 22, and the interval on the distal end portion 23a side is wider than the interval on the base portion 23b side. That is, it is for making it easy to receive the box-shaped workpiece W between the flaps 23 from the front end portion 23a side. The discharge conveyor 20 is driven in synchronization with the lowering unit 12, and the discharge timing of the box-shaped workpiece W from the lowering unit 12 and the speed of the conveyor belt 22 passing under the lowering unit 12 are associated with each other. Each flap 23 circulates along with the conveyor belt 22 while maintaining an upright state on the conveyor belt 22 at any position of the conveyor belt 22.

  The high-speed conveyor A3 located at the end of the supply conveyor A has box-shaped workpieces W mounted on the conveyor belt at regular intervals (FIGS. 2 to 4), and is always operated at a constant speed. Therefore, the box-shaped workpiece W is continuously thrown out from the downstream end of the high-speed conveyor A3 toward the opening 13A on the upper side of the guide cylinder 13 at regular intervals. The high-speed conveyor A3 and the pair of lowering units 12 are operated synchronously. The blades 12A and 12A corresponding to the uppermost positions of the pair of lowering units 12 are such that the first box-shaped workpiece W is the opening 13A of the guide tube 13. At the point in time, the posture facing each other on the line connecting the pair of rotating shafts 12B and 12B is completed inside the guide tube 13 (FIG. 5). The box-shaped workpiece W is supplied from the direction of the arrow K0 in the figure, and the rotation directions of the rotary shaft 12B in the pair of the lowering units 12 corresponding to the supply direction K0 are indicated by arrows K1 and K2, respectively.

  The box-shaped workpiece W thrown out by the high-speed conveyor A3 and entered from the upper opening 13A of the guide cylinder 13 is put into the box-shaped workpiece W by the uppermost pair of blades 12A that have entered the guide cylinder 13 through the slit d. Both ends of the bottom are supported. At this time, the amount of overlap between the box-shaped workpiece W and each blade 2A can be adjusted by setting the length of the blade 12A (FIG. 7A, FIG. 8 (S2)). Whether to use the front surface or the back surface of the blade 12A is selected according to the surface mode of the box-shaped workpiece W to be handled. For example, in the case where the box-shaped workpiece W is wrapped with a very smooth wrap, it is preferable to use a surface finish that does not stick to the wrap, for example, a satin finish surface. As long as the guide tube 13 is used, the horizontal position of the box-shaped workpiece W is limited within the guide tube 13, and there is a special problem in that slip occurs between the blade 12 </ b> A and the box-shaped workpiece W. Because there is no. That is, the guide cylinder 13 is not necessarily used when the horizontal position of the box-shaped workpiece W is uniformly determined within a certain fixed range when the box-shaped workpiece W is received by the blade 12A. When the guide tube 13 is not used, the pusher device 50 described in the conventional example is not necessary.

  When the rotary shaft 12B of the lowering unit 12 is driven to rotate at a predetermined rotational speed and a phase angle θ = 72 degrees, the box-shaped workpiece W tries to stop at that position due to static inertia and supports the box-shaped workpiece W. The blade 12A comes out from the lower side of the box-shaped workpiece 12 in the rotation directions K1 and K2 of the rotary shaft 12B. At this point, the posture in which the second stage blades 12A face each other in a straight line is completed. Therefore, the box-shaped workpiece W that has lost its static inertia falls on the second stage blade 12A due to the acceleration of gravity, and at the same time, the second box-shaped workpiece W is supplied from the high-speed conveyor A3, and the supplied box-shaped workpiece is supplied. The workpiece W is received by the second stage blade 12A through the first box-shaped workpiece W (FIG. 7A, FIG. 8 (S3)). In this way, the two-stage stacking of the box-shaped workpieces W is completed.

  Similarly, each time the phase of the rotary shaft 12B advances 72 degrees, the box-shaped workpiece W is sequentially lowered to the lower blade 12B, and the three-stage stacking, the four-stage stacking, and the five-stage stacking of the box-shaped workpiece W are executed. (FIGS. 7B and 7C, (S4) to (S6) in FIG. 8). After the five-stage stacking of the box-shaped workpieces W is completed, when the phase of the rotating shaft 12B further advances by 72 degrees, that is, when the rotating shaft 12B makes one rotation, the five-stage stacked box-shaped workpieces W are in a five-stage stacked state. The lowermost blade 12A is dropped on the lowermost blade 12A, and the uppermost left and right blades 12A complete the posture of facing each other at this point. Here, the posture facing on a straight line means that the left and right blades 12A positioned under the box-shaped workpiece W shown in FIG. Here, the box-shaped workpiece W supplied to the sixth piece is received by the blade 12A at the uppermost position as the first piece of the next five-stage stack (FIG. 7C, FIG. 8 (S7)). That is, a multi-stage state of five-stage stacking is repeatedly obtained, but the first stage of the next five-stage stacking is a state when the upper left and right blades 12A make one rotation and enter the next rotation. Sometimes the first stage is received and supported (FIG. 7C, FIG. 8 (S7)). Then, the above operation is repeated. Therefore, it is sufficient that the box-shaped workpieces W are continuously supplied from the high-speed conveyor A3 at equal intervals, and there is no need to set an interval for each multi-stage stacking unit as in the conventional apparatus.

  When the phase of the rotary shaft 12B advances 72 degrees, the five-stage box-shaped workpiece W falls between the flaps 23 of the discharge conveyor 20 installed below the carry-down unit 12, and is supported by the blade 12A at the uppermost position. The box-shaped workpiece W drops onto the second stage blade 12A, and the second box-shaped workpiece W is supplied thereon (FIG. 7C, FIG. 8 (S8)).

  That is, in the operation of the stacking apparatus 10 as described above, there is no independent discharge process that should be performed over a certain period, and as a result, high-speed operation as long as the box-shaped workpiece W can be supplied can be achieved. . However, although the limit of speeding up based on the fact that the vertical movement of the box-shaped workpiece W between the upper and lower blades 12A uses the acceleration of gravity cannot be denied, the benefits of sufficient work efficiency improvement before that limit Can be enjoyed.

  In the above embodiment, the synchronous driving method by one motor M of the pair of rotating shafts 12B in the carry-down unit 12, the rotational directions K1 and K2 of the rotating shaft 12B, the number of blades 12A attached to the rotating shaft 12B, the vertical interval , The phase angle θ, the shape and size of the blade 12B, the types and modes of the supply conveyor A and the discharge conveyor 20 are all examples.

  For example, the driving of the pair of rotating shafts 12B of the lowering unit 12 may be driven synchronously using a connecting shaft having bevel gears attached to both ends, and the two driving motors M are electrically synchronized. It can also be used. Further, with respect to the rotation direction, it is not always necessary to rotationally drive in the K1 and K2 directions in order to realize the stacking operation. With regard to the shape and form of the blade 12A, if each blade 12A has a two-layer structure using a lightweight metal such as geralumin, and the shape and maximum radius can be changed by changing the overlap, various box-shaped workpieces can be obtained. The suitability for W can be improved. Regarding the driving of the rotary shaft 12B by the drive motor M, the phase of the rotary shaft 12B may be continuously advanced, or the stepping motor may be used to drive the rotary shaft in a predetermined phase angle unit. In addition, in order to promote the fall of the box-shaped workpiece W from the blade 12A, it is possible to stick a tape having a high sliding effect on the surface of the blade 12A.

  Next, when the present embodiment and the conventional multi-stage stacking device 102 are compared, it is not necessary to strictly consider the drop distance in the drop timing (operation timing) with the supply devices 20 and 30, and the operation rate Increased by about 50%. This is because the supply by the supply devices 20 and 30 is not required to have an interval for every multi-stage stacking, so that the speed can be increased. However, the conventional apparatus 102 is expected to have an advantage over the present embodiment in the use of a place where it is necessary to ensure the height, the posture of multi-stage stacking, and the like. Conceivable.

(Second Embodiment)
In this embodiment, as shown in FIGS. 9 and 10, the number of blades 12A is six as in the first embodiment, but the blades 12A arranged in stages are in the upper position. The stacking device 40 is attached in such a manner that the phase is sequentially delayed by θ = 51 degrees from the bottom to the bottom. That is, in the first embodiment, the uppermost blade 12A and the lowermost blade 12A face the same direction, and the blades are arranged at equal intervals of θ = 72 degrees. In this embodiment, they are attached with the phase of θ = 51 degrees sequentially from the upper position to the lower position, and the uppermost blade 12A and the lowermost blade 12A are spaced at an interval of 105 degrees. θ2 is formed (reference sign θ2 in FIG. 10 = 360 degrees−51 degrees × 5). The box-shaped workpiece W is supplied to the stacking device 40 connected to the supply conveyor 110 for supplying the box-shaped workpiece W. The box-shaped workpiece W is received from the supply conveyor 110, and the box-shaped workpiece W is thrown at a predetermined height. For intermittent storage, the pitcher conveyor 130 to be taken out and the box-shaped workpieces W sequentially conveyed to the supply conveyor 110 without stopping the supply conveyor 110 are intermittently forcibly stopped and a plurality of box-shaped workpieces W are stored and then released. A shutter device 120 is provided on the supply conveyor 110.

  The supply conveyor 110 is an apparatus that aligns the box-shaped workpieces W that are sequentially conveyed to the box-shaped workpiece group W1... W5 in a multi-stacking unit, and the upper surface of the conveyor belt 111 is configured as a horizontal plane. The box-shaped workpieces W1... W5 conveyed from the conveyor A1 are shifted to a horizontal posture. The supply conveyor 110 is a special conveyor having a conveyor belt 111 made of a low friction film material having high smoothness, unlike a conveyor having a conveyor belt made of a general high friction material. Small-diameter conveyor rolls 112 and 112 are respectively installed on the upstream end side (conveying conveyor A1 side) 110B and the downstream end side (pitcher conveyor 130 side) 110F of the conveyor frame 116, and a box 118 below the conveyor frame 116 is provided. Inside, a drive motor MT1 to which a drive roll 115 is attached is disposed. A pair of tensioners 113 and 113 including tension rolls 113 </ b> R are disposed obliquely above the drive roll 115.

  The conveyor belt 111 of the supply conveyor 110 is wound so as to form a loop that reaches the drive roll 115 via the front and rear conveyor rolls 112, 112, and the pair of tensioners 113, 113 passes through the tension rolls 113R, 113R. Thus, the conveyor belt 111 is squeezed from both sides at a position closest to the drive roll 115 so as to increase the contact area between the drive roll 115 and the conveyor belt 111. Thus, the drive motor MT1 prevents the low-friction conveyor belt 111 from slipping via the drive roll 115.

  The supply conveyor 110 is provided with a pair of guide bars 117 and 117 along both sides of the conveyor belt 111 (FIGS. 9 and 10). Each guide bar 117 is made of an aluminum alloy pipe member whose surface has been finely polished to improve slippage. The guide bar 117 is lifted from the conveyor belt 111 by support fittings 117b, 117b,. It is fixed in the state. The pair of guide bars 117, 117 are bent so as to narrow the distance from the upstream end side 110 </ b> B to the downstream end side 110 </ b> F of the supply conveyor 110, and the tip ends extend on both sides of the pitcher conveyor 130.

  The intermittent storage shutter device 120 is for intermittently forcibly stopping the box-shaped workpiece group W that is sequentially conveyed, and is opened. The shutter device 120 includes a shutter plate 121 having an L-shaped cross section, and is provided on the downstream end side 110 </ b> F of the supply conveyor 110. Is arranged. A pair of brackets 122, 122 provided with bearings are erected on the conveyor frames 116, 116 on the downstream end side 110F, and a shaft 122b with a pair of slot blocks 122c, 122c attached between the brackets 122, 122. It is installed horizontally. The shutter plate 121 is screwed to the slit blocks 122c and 122c. An arm 123 is attached to one end side of the shaft 122b, and a bracket 125b serving as a scaffold projects from the side surface of the column member f1 of the frame 1F (FIG. 9). The shutter plate 121 can be moved up and down (rotatable) by the air cylinder 125, and the air cylinder 125 is interposed between the arm 123 and the bracket 125b. The air cylinder 125 is a double-acting cylinder and can be forcibly driven in both directions of the rod. The shutter plate 121 is bent into an L-shaped cross-section to give structural strength, blocks the box-shaped workpiece W downward, and rotates downward from the conveyance direction (in FIG. 1, it rotates counterclockwise). To do. In addition, although the air cylinder 125 of this Embodiment is one on one side, it is also possible to arrange two on both sides and drive synchronously.

  The pitcher conveyor 130 receives the box-shaped workpiece W from the supply conveyor 110 and throws out the articles at a predetermined height. The pair of conveyor belts 131 and 131 keeps a distance in the width direction of the conveyor belt 111 of the supply conveyor 110. And the box-shaped workpieces W1 to W5 are arranged so as to be connected to the side 110F of the stacking device 40 on the downstream end side of the supply conveyor 110 (FIGS. 9 and 10). As the conveyor belts 131 and 131 of the pitcher conveyor 130, those having a large friction coefficient made of a rubber-based material are adopted, contrary to the supply conveyor 110.

  The intermittent storage shutter device 120 releases the L-shaped shutter plate 121 when the uppermost blade 12A of the stacking device 40 reaches a position where the box-shaped workpiece W from the supply conveyor 110 can be mounted. So that it is controlled. That is, the stacking device 40 is provided with a detection sensor SS that detects that the blade 12A at the uppermost position has reached a position where the box-shaped workpiece W from the supply conveyor 110 can be mounted. The shutter plate 121 of the storage shutter device 20 is released. Therefore, in the setting position of the stacking device 40 and the supply conveyor 110, and between the stacking device 40 and the discharge conveyor 20, it is possible to achieve mutual adjustment. That is, when it takes time to discharge the box-shaped workpieces W stacked in five stages by the stacking device 40 to the discharge conveyor 20 (when the stacking is more than five stages, it takes time to discharge, and when the whole is dropped. It is also expected that the uppermost box-shaped workpiece W will collide with the blade 12A before dropping.), The distance between the stacking device 40 and the supply conveyor 110 that supplies the box-shaped workpiece W may be increased. Even if it does not match the rotation of the rotating shaft 12B of the stacking device 40, the blades 12A are arranged so as to be packed at equal intervals of 51 degrees, and the uppermost blade 12A and the lowermost blade 12A are 105 degrees. Therefore, stacking can be performed efficiently and sequentially from the blade 12A at the uppermost position.

  Here, by adopting the above-described structure, it is also possible to change the direction when the five stages are stacked and dropped from the supply conveyor 110 and to discharge to the discharge conveyor 20 by changing the direction. In the above stacking apparatus 40, the blades 12A arranged in stages are sequentially delayed by θ = about 51 degrees from the upper position to the lower position, and are attached at equal intervals. Depending on the implementation, the lower blade 12A may be stacked in six or seven stages in the same direction as the uppermost blade 12A with a phase delay of 360 degrees.

It is a typical top view which shows the positioning of the stacking apparatus of the box-shaped workpiece | work which concerns on this invention in relation to a peripheral device. It is a perspective view which fractures | ruptures and shows one Embodiment of this invention. It is a perspective view which shows the said embodiment from a different direction. It is a side view in the said embodiment. It is an enlarged plan view of the principal part in the said embodiment. It is a figure of the blade in the said embodiment, (a) is the operation | movement explanatory drawing, (b) is a figure shown from a side surface, (c) is a figure shown from the downward side. It is operation | movement explanatory drawing of the carry-down unit in the said embodiment. It is a block diagram which shows the operation | movement step in the said embodiment. It is a side view which shows the supply conveyor of the 2nd Embodiment of this invention. It is a principal part enlarged plan view which shows the stacking apparatus of the box-shaped workpiece | work of the said 2nd Embodiment. It is a side view which shows the conventional stacking apparatus of a box-shaped workpiece | work with its peripheral device.

Explanation of symbols

W (W1... W5) Box-shaped workpiece θ Phase angle A, 110 Supply conveyor d Blade slit e Blade center hole f Blade notch K1 Rotation direction K2 Rotation direction F1 Front edge F2 Rear edge 10, 40 Stacking device 12 Lowering unit 12A Blade 12B Rotating shaft 13 Guide tube 13A Opening 13B Opening 20 Discharge conveyor 23 Flap 120 Intermittent storage shutter device 130 Pitcher conveyor

Claims (6)

A plurality of blades that sequentially receive and support box-shaped workpieces continuously supplied from a supply conveyor, and a pair of lowering units provided with rotating shafts that rotate the plurality of blades are arranged on the left and right,
The plurality of blades in each of the pair of lowering units are arranged in stages while maintaining a predetermined vertical distance, and each rotation is performed by sequentially delaying the phase from the upper blade to the lower blade in the rotation direction. Mounted at equal angular intervals on the shaft,
The pair of left and right lowering units are arranged so that the box-shaped workpieces sequentially supplied onto the pair of left and right blades facing each other between the pair of rotation shafts are sequentially opposed to each other by the rotation of the pair of rotation shafts. A box-shaped workpiece stacking device characterized by being lowered into a pair of left and right blades.   A guide cylinder is provided between the rotation shafts of the pair of left and right lowering units. The guide cylinder includes an upper opening for feeding the box-shaped workpiece, a lower opening for discharging the box-shaped workpiece, and 1 A plurality of slits for passing a plurality of blades of a pair of lowering units are provided, and the pair of left and right lowering units performs a lowering operation of a box-shaped workpiece in a guide cylinder by blades that sequentially pass through the plurality of slits. The box-shaped workpiece stacking apparatus according to claim 1, wherein   Each blade in the lowering unit has a surface finish with different frictional forces on the front and back surfaces, and each blade in the lowering unit has a different finish on the front and back frictional forces, and passes through the rotating shaft. 2. A box-shaped workpiece stacking apparatus according to claim 1, wherein a notch communicating with the outer peripheral portion from the central hole is formed.   Each blade in the lowering unit has a shape including a portion having a small rotation radius of the blade around the rotation axis and a portion having a large rotation radius of the blade, and the blade around the rotation axis as the rotation shaft rotates. 2. The box-shaped workpiece stacking apparatus according to claim 1, wherein a portion having a small rotation radius is pulled out from a lower portion of the box-shaped workpiece prior to a portion having a large rotation radius of the blade.   2. The rear edge of each blade in the lowering unit is formed in a shape that follows the outer shape of the box-shaped workpiece when the blade is pulled out from below the box-shaped workpiece as the rotation shaft rotates. The box-shaped workpiece stacking device described.   A pitcher conveyor that is connected to the supply conveyor and receives articles from the supply conveyor and ejects articles at a predetermined height, and articles that are sequentially conveyed to the supply conveyor without stopping the supply conveyor. The supply conveyor is provided with an intermittent storage shutter device which is intermittently forcibly stopped and stored after storing a plurality of articles, and the driving speed of the conveyor belt of the pitcher conveyor is relative to the driving speed of the conveyor belt of the supply conveyor. The box-shaped workpiece stacking apparatus according to claim 1, wherein the box-shaped workpiece stacking apparatus is set to be large.

Images