Carton discharging device of printing linkage line

Abstract

The utility model provides a carton discharging device of a printing linkage line, which comprises a pushing mechanism, a stacking mechanism, a stopping mechanism, a feeding conveying belt and a discharging conveying belt, the feeding conveying belt and the discharging conveying belt are used for conveying cartons, and the pushing mechanism is arranged above the feeding conveying belt and used for pushing the stacked cartons to the discharging conveying belt; the stacking mechanism is a stacking conveying belt, one end of the stacking conveying belt is a stacking part located between the feeding conveying belt and the discharging conveying belt, and an adjusting assembly for adjusting the height and angle of the stacking part is arranged on the stacking conveying belt; a lower stopping plate is arranged between the stacking part and the discharging conveying belt, and the stopping mechanism is arranged above the discharging conveying belt and used for stopping the upper portions of the stacked cartons and preventing the stacked cartons from toppling over. The stacking conveyor belt is adopted as the stacking part, the entering resistance to paperboards can be reduced, the stacking speed is increased, and the stacking part is adjustable, good in flexibility and wider in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of carton production and manufacturing, in particular to a carton discharging device for a printing linkage line. Background Art

[0002] In the carton printing linkage production line, there are usually processes such as paper feeding, printing, slotting, die cutting, folding, and box gluing. Among them, after the box gluing process is completed, the cartons need to be stacked and counted by the counting and discharging device, and then transported to the automatic strapping machine for packaging into bundles, which is convenient for bundle transportation and sales.

[0003] However, the existing discharge devices generally use a fixed stacking frame to stack cartons. The inclination angle and height of the stacking frame cannot be adjusted, which limits the size of the cartons. In addition, since the stacking frame is inclined, the prior art only provides a stop structure at the bottom of the stacking frame and a paper pressing structure on the top of the stacked cartons. However, after the cartons are stacked to a certain height, the cartons stacked on the upper end are prone to tipping over. The bottom stop structure and the top paper pressing structure have little effect on stopping the tipping over of the stacked cartons on the upper end, and there is still a risk of tipping over. Utility Model Content

[0004] The utility model aims to provide a carton discharging device for a printing linkage line to overcome the shortcomings in the prior art.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a carton discharge device of a printing linkage line, comprising a pushing mechanism, a stacking mechanism, a stop mechanism and a feed conveyor belt and a discharge conveyor belt for conveying cartons, the pushing mechanism is arranged above the feed conveyor belt, and is used to push the stacked cartons to the discharge conveyor belt; the stacking mechanism is a stacking conveyor belt, one end of the stacking conveyor belt is a stacking portion located between the feed conveyor belt and the discharge conveyor belt, and the stacking conveyor belt is provided with an adjustment component for adjusting the height and angle of the stacking portion; a lower stop plate is provided between the stacking portion and the discharge conveyor belt, and the stop mechanism is arranged above the discharge conveyor belt, and is used to stop the upper part of the stacked cartons when stacking the cartons to prevent the stacked cartons from tipping over.

[0006] Furthermore, in the above-mentioned carton discharge device of the printing linkage line, the pushing mechanism includes a paper pushing rack, a lifting component for driving the paper pushing rack to rise and fall, and a driving component for driving the paper pushing rack to translate, the driving component includes a pushing slide rod, a sliding plate, a main rotating shaft, a slave rotating shaft, and a servo motor, the output end of the servo motor is connected to the main rotating shaft through a coupling, the slave rotating shaft and the main rotating shaft are both fixed to the pushing mounting frame through bearing seats, and synchronous wheels are provided at corresponding positions on the slave rotating shaft and the main rotating shaft, a synchronous belt is wound around the synchronous wheels at corresponding positions, a pushing slide rod is provided on the outer side of the synchronous wheel, a slide rail 1 is provided under the pushing slide rod, a slider cooperating with the slide rail 1 is provided on the pushing mounting frame, and the end of the pushing slide rod is connected to the sliding plate; the lifting component is arranged on the sliding plate.

[0007] Furthermore, in the carton discharge device of the above-mentioned printing linkage line, the lifting assembly includes a lifting cylinder and a guide rod. The bottom of the paper pushing rack is provided with a tongue that can be inserted into the bottom of the carton, and the top is connected to the telescopic end of the lifting cylinder. The lifting cylinder is fixed on a sliding plate, and the paper pushing rack is also provided with a guide rod. The guide rod is slidably connected to a linear bearing arranged on the sliding plate.

[0008] Furthermore, the carton discharge device of the above-mentioned printing linkage line also includes a paper-beating mechanism, which is used to tidy up the cartons on the stacking mechanism, and includes a paper-beating paper board and a swinging component that drives the paper-beating paper board to swing back and forth; the swinging component includes a rotating shaft and an eccentric bearing seat arranged on the rotating shaft, the eccentric bearing seat is connected to the paper-beating bearing seat through an adjusting screw rod, the paper-beating bearing seat is connected to the paper-beating movable seat, the paper-beating movable seat is arranged on the paper-beating mounting frame and is slidably connected to the paper-beating mounting frame through a second slide rail, and the paper-beating paper board is connected to the paper-beating movable seat.

[0009] Furthermore, in the carton discharge device of the above-mentioned printing linkage line, the stacking portion is a slope platform structure composed of a feed surface and a stacking surface, and the adjusting component includes an adjusting component one for adjusting the feed surface and an adjusting component two for adjusting the stacking surface; the bottom of the stacking portion is connected to the discharge port of the feed conveyor belt, the lower stop plate is arranged on the top of the stacking portion and is fixed to the discharge conveyor belt through a support beam, the lower stop plate is connected to the feed port of the discharge conveyor belt, and the stacking portion is connected to the feed port of the discharge conveyor belt through the lower stop plate.

[0010] Furthermore, in the above-mentioned carton discharge device of the printing linkage line, the adjusting component 1 includes a belt shaft 1 and a belt shaft 2 which support the stacking conveyor belt to form a feeding surface, the belt shaft 1 is close to the feeding conveyor belt, and the belt shaft 2 is arranged obliquely above the belt shaft 1, the belt shaft 1 and the belt shaft 2 are connected to the adjusting slide 1 through a bearing seat, and the adjusting slide 1 is provided with a slide bar 1 which is slidably connected to the adjusting bracket 1; the adjusting component 2 includes a belt shaft 3, the belt shaft 3 and the belt shaft 2 support the stacking conveyor belt to form a stacking surface, the belt shaft 3 is connected to the adjusting slide 2 through a bearing seat, the adjusting slide 2 is provided with a slide bar 2 which is slidably connected to the adjusting bracket 2, and the adjusting bracket 2 is also connected to the support beam through a adapter plate.

[0011] Furthermore, in the carton discharge device of the above-mentioned printing linkage line, the stop mechanism includes a rotary cylinder, a cylinder fixing seat, a rotary rod, and a paper stop rod. The rotary cylinder is fixed on one side of the cylinder fixing seat, and its output end is connected to one end of the rotary rod. The other end of the rotary rod is connected to the other side of the cylinder fixing seat through a bearing seat. The paper stop rod is provided with at least one, which is fixed on the rotary rod.

[0012] Furthermore, the carton discharge device of the above-mentioned printing linkage line also includes a paper pressing mechanism, which is arranged above the stacking part and is movably connected to the top of the stacked cartons for pressing against the top of the stacked cartons.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model adopts a stacking conveyor belt as a stacking part, which can reduce the entry resistance of cardboard and speed up the stacking speed, and the stacking angle and height are adjustable, which has better flexibility and can adapt to the stacking of cartons of various sizes, and has a wider range of use. And the setting of the stop mechanism can stop the upper part of the stacked cartons when stacking cartons to prevent the upper part of the cartons from tipping over. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a carton discharging device of a printing linkage line of the utility model;

[0016] Figure 2 It is a schematic diagram of the main structure of the carton discharge device of the printing linkage line of the utility model;

[0017] Figure 3It is a partial structural schematic diagram of the stacking mechanism of the carton discharging device of the printing linkage line of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the pushing mechanism of the carton discharging device of the printing linkage line of the utility model;

[0019] Figure 5 It is a structural schematic diagram of the stopper mechanism and the paper pressing mechanism of the carton discharging device of the printing linkage line of the utility model;

[0020] In the figure: 1, push mechanism; 11, paper push rack; 111, tongue; 12, lifting assembly; 121, lifting cylinder; 122, guide rod; 13, driving assembly; 131, push slide rod; 132, slide plate; 133, main shaft; 134, slave shaft; 135, servo motor; 136, push mounting frame; 137, synchronous wheel; 138, slide rail 1;

[0021] 2. Stacking mechanism; 21. Stacking part; 211. Feeding surface; 212. Stacking surface; 22. Adjustment component 1; 221. Belt shaft 1; 222. Belt shaft 2; 223. Adjustment slide 1; 224. Adjustment bracket 1; 225. Slide 1; 23. Adjustment component 2; 231. Belt shaft 3; 232. Adjustment slide 2; 233. Adjustment bracket 2; 234. Slide 2; 235. Adapter plate;

[0022] 3. Stop mechanism; 31. Rotary cylinder; 32. Cylinder fixing seat; 33. Rotary rod; 34. Paper stop rod;

[0023] 4. Feed conveyor belt;

[0024] 5. Discharging conveyor belt;

[0025] 6. Lower stop plate; 61. Support beam;

[0026] 7. Paper-beating mechanism; 71. Paper-beating board; 72. Rotating shaft; 73. Eccentric bearing seat; 74. Adjusting screw rod; 75. Paper-beating bearing seat; 76. Paper-beating moving seat; 77. Paper-beating mounting frame; 78. Slide rail 2;

[0027] 8. Paper pressing mechanism. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] like Figure 1-5 As shown, a carton discharge device of a printing linkage line is arranged on a paper receiving rack (not shown in the figure), comprising a pushing mechanism 1, a stacking mechanism 2, a stopping mechanism 3, and a feed conveyor belt 4 and a discharge conveyor belt 5 for conveying cartons, wherein the pushing mechanism 1 is arranged above the feed conveyor belt 4, and is used for pushing the stacked cartons to the discharge conveyor belt 5; the stacking mechanism 2 is a stacking conveyor belt, and one end of the stacking conveyor belt is a stacking portion 21 located between the feed conveyor belt 4 and the discharge conveyor belt 5, and the stacking conveyor belt is provided with an adjusting component for adjusting the height and angle of the stacking portion 21; a lower stop plate 6 is provided between the stacking portion 21 and the discharge conveyor belt 5, and the stopping mechanism 3 is arranged above the discharge conveyor belt 5, and is used for stopping the upper part of the stacked cartons when stacking the cartons to prevent the stacked cartons from tipping over. The utility model adopts a stacking conveyor belt as a stacking frame, which can reduce the entry resistance to cardboard and speed up the stacking speed; the stacking frame has adjustable angle and height, has better flexibility, can adapt to the stacking of cartons of various sizes, and has a wider range of use.

[0031] In the above structure, if Figure 1 , 3 As shown, the stacking portion 21 is a slope platform structure composed of a feed surface 211 and a stacking surface 212, and the adjusting component includes an adjusting component 1 22 for adjusting the feed surface 211 and an adjusting component 2 23 for adjusting the stacking surface 212; the bottom of the stacking portion 21 is connected to the discharge port of the feed conveyor belt 4, the lower stop plate 6 is arranged on the top of the stacking portion 21, and is fixed to the discharge conveyor belt 5 through a support beam 61, the lower stop plate 6 can stop the lower part of the stacked cartons, the transition inclined plate on the top of the lower stop plate 6 is connected to the feed port of the discharge conveyor belt, and the stacking portion 21 is connected to the feed port of the discharge conveyor belt 5 through the lower stop plate 6.

[0032] Among them, Figure 1 , 3As shown, the adjusting component 22 includes a belt shaft 1 221 and a belt shaft 222 supporting the stacking conveyor belt to form a feed surface 211. The belt shaft 1 221 is close to the feed conveyor belt 4, and the belt shaft 222 is arranged obliquely above the belt shaft 1 221, that is, the feed surface 211 is an inclined surface, which can facilitate the paperboard to enter the stacking surface 212 and also facilitate the insertion of the tongue 111 of the paper pusher 11. The belt shaft 1 221 and the belt shaft 222 are connected to the adjusting slide 1 223 through a bearing seat. The adjusting slide 1 223 is provided with a slide bar 1 225 slidably connected to the adjusting bracket 1 224. The slide bar 1 225 and the adjusting bracket 1 224 are connected by an adjusting screw. Then, by rotating the adjusting screw, the distance between the slide bar 225 and the adjusting bracket 224 can be adjusted, thereby adjusting the height of the feed surface 211 so that the feed surface reaches the optimal feed angle; the adjusting component 23 includes a belt shaft 3 231, and the belt shaft 3 231 and the belt shaft 222 support the stacking conveyor belt to form the stacking surface 212, and the belt shaft 3 231 is connected to the adjusting slide seat 232 through a bearing seat, and the adjusting slide seat 232 is provided with a slide bar 234 slidably connected to the adjusting bracket 233, and the adjusting bracket 233 is also connected to the support beam 61 through the adapter plate 235, thereby ensuring the connection between the stacking part 21 and the discharge conveyor belt 5. The slide bar 234 and the adjustment bracket 233 are also connected by an adjusting screw. By rotating the adjusting screw, the distance between the slide bar 234 and the adjustment bracket 233 can be adjusted, thereby adjusting the height of the belt shaft 3 231, and the maximum height and inclination angle of the stacking surface 212 can be adjusted, so that the stacked cartons will not be overturned due to a too large slope and will not be unable to enter due to a too small slope.

[0033] In addition, if Figure 1 , 5 As shown, the stop mechanism 3 includes a rotary cylinder 31, a cylinder fixing seat 32, a rotary rod 33, and a paper stop rod 34. The rotary cylinder 31 is fixed to one side of the cylinder fixing seat 32, and its output end is connected to one end of the rotary rod 33. The other end of the rotary rod 33 is connected to the other side of the cylinder fixing seat 32 through a bearing seat. The paper stop rod 34 is provided with at least one fixed on the rotary rod 33. In this embodiment, two paper stop rods 34 are provided. When stacking, the rotary cylinder 31 drives the rotary rod 33 to rotate, so that the paper stop rod 34 is vertically arranged to stop the upper part of the stacked cartons to prevent the cartons from tipping over. When the counted number is reached, the rotary cylinder 31 and the push drive assembly 13 act synchronously, and drive the paper stop rod 34 to rotate to a horizontal state while pushing, so that the stacked cartons can smoothly enter the discharge conveyor belt 5.

[0034] Example 2

[0035] Based on the structure of Example 1, Figure 1 , 4As shown, the pushing mechanism 1 includes a paper pushing rack 11, a lifting assembly 12 for driving the paper pushing rack 11 to rise and fall, and a driving assembly 13 for driving the paper pushing rack 11 to translate. The driving assembly 13 includes a pushing slide bar 131, a sliding plate 132, a main rotating shaft 133, a slave rotating shaft 134, and a servo motor 135. The output end of the servo motor 135 is connected to the main rotating shaft 133 through a coupling. The slave rotating shaft 134 and the main rotating shaft 133 are both fixed to the pushing mounting frame 13 through a bearing seat. 6, and a synchronous wheel 137 is provided at the corresponding position on the slave shaft 134 and the main shaft 133, a synchronous belt is wound around the synchronous wheel 137 at the corresponding position, a push slide 131 is provided on the outer side of the synchronous wheel 137, a slide rail 138 is provided below the push slide 131, a slider matched with the slide rail 138 is provided on the push mounting frame 136, and a sliding plate 132 is connected to the end of the push slide 131; the lifting assembly 12 is arranged on the sliding plate 132. The traditional pushing mechanism generally adopts a cylinder to drive the paper pusher 11 to translate, and its push speed cannot be adjusted, and the push stroke is also uncontrollable. The utility model adopts a synchronous belt transmission structure driven by a servo motor to drive the paper pusher 11 to translate, and its push speed is controllable and adjustable, and the push stroke is also adjustable, and it is easy to adjust, and can adapt to the push of cartons of more sizes.

[0036] In the above structure, if Figure 4 As shown, the lifting assembly 12 includes a lifting cylinder 121 and a guide rod 122. The bottom of the paper pusher 11 is provided with a tongue 111 that can be inserted into the bottom of the carton, and the top of the tongue 111 is connected to the telescopic end of the lifting cylinder 121. The lifting cylinder 121 is fixed on the sliding plate 132. The paper pusher 11 is also provided with a guide rod 122, and the guide rod 122 is slidably connected to a linear bearing provided on the sliding plate 132.

[0037] like Figure 1 , 2 As shown, the carton discharging device of the printing linkage line also includes a paper-beating mechanism 7, which is used to align the cartons on the stacking mechanism 2, and includes a paper-beating board 71 and a swinging assembly that drives the paper-beating board 71 to swing back and forth; the swinging assembly includes a rotating shaft 72 and an eccentric bearing seat 73 arranged on the rotating shaft 72, the eccentric bearing seat 73 is connected to the paper-beating bearing seat 75 through an adjusting screw rod 74, the paper-beating bearing seat 75 is connected to a paper-beating moving seat 76, the paper-beating moving seat 76 is arranged on a paper-beating mounting frame 77 and is slidably connected to the paper-beating mounting frame 77 through a second slide rail 78, and the paper-beating board 71 is connected to the paper-beating moving seat 76. Aligning the paperboards can prevent the paperboards from trailing when entering the stacking part 21, which affects the entry of subsequent cartons; in addition, the distance between the eccentric bearing seat 73 and the paper-beating bearing seat 75 can be adjusted by adjusting the screw rod 74, thereby adjusting the distance between the paper-beating board 71 and the lower stop plate 6, so as to adapt to cartons of different sizes.

[0038] In addition, if Figure 1 , 5 As shown, the carton discharge device of the above-mentioned printing linkage line also includes a paper pressing mechanism 8, which is arranged above the stacking part 21. The paper pressing mechanism 8 is movably connected to the top of the stacked cartons and is used to press against the top of the stacked cartons, which can ensure that the cartons are stacked neatly, reduce subsequent work, and improve production efficiency.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A carton discharging device for a printing linkage line, characterized in that: It includes a pushing mechanism, a stacking mechanism, a stopping mechanism, and a feed conveyor belt and a discharging conveyor belt for conveying cartons. The pushing mechanism is arranged above the feed conveyor belt, and is used for pushing the stacked cartons to the discharging conveyor belt; the stacking mechanism is a stacking conveyor belt, one end of the stacking conveyor belt is a stacking portion located between the feed conveyor belt and the discharging conveyor belt, and the stacking conveyor belt is provided with an adjusting component for adjusting the height and angle of the stacking portion; a lower stop plate is provided between the stacking portion and the discharging conveyor belt, and the stopping mechanism is arranged above the discharging conveyor belt, and is used for stopping the upper part of the stacked cartons when stacking the cartons to prevent the stacked cartons from tipping over.

2. The carton discharging device of the printing line according to claim 1 is characterized in that: The pushing mechanism includes a paper pushing rack, a lifting component for driving the paper pushing rack to rise and fall, and a driving component for driving the paper pushing rack to translate. The driving component includes a pushing slide rod, a sliding plate, a main rotating shaft, a slave rotating shaft, and a servo motor. The output end of the servo motor is connected to the main rotating shaft through a coupling. The slave rotating shaft and the main rotating shaft are both fixed to the pushing mounting frame through a bearing seat, and synchronous wheels are provided at corresponding positions on the slave rotating shaft and the main rotating shaft. A synchronous belt is wound around the synchronous wheels at corresponding positions. A pushing slide rod is provided on the outer side of the synchronous wheel. A slide rail 1 is provided under the pushing slide rod. A slider cooperating with the slide rail 1 is provided on the pushing mounting frame. The end of the pushing slide rod is connected to the sliding plate. The lifting component is provided on the sliding plate.

3. The carton discharging device of the printing line according to claim 2 is characterized in that: The lifting assembly includes a lifting cylinder and a guide rod. The bottom of the paper pusher is provided with a tongue that can be inserted into the bottom of the carton, and the top is connected to the telescopic end of the lifting cylinder. The lifting cylinder is fixed on a sliding plate. The paper pusher is also provided with a guide rod, and the guide rod is slidably connected to a linear bearing arranged on the sliding plate.

4. The carton discharging device of the printing line according to claim 1, characterized in that: It also includes a paper-beating mechanism, which is used to tidy up the cartons on the stacking mechanism, and includes a paper-beating board and a swinging component that drives the paper-beating board to swing back and forth; the swinging component includes a rotating shaft and an eccentric bearing seat arranged on the rotating shaft, the eccentric bearing seat is connected to the paper-beating bearing seat through an adjusting screw rod, the paper-beating bearing seat is connected to the paper-beating movable seat, the paper-beating movable seat is arranged on the paper-beating mounting frame and is slidably connected to the paper-beating mounting frame through a second slide rail, and the paper-beating board is connected to the paper-beating movable seat.

5. The carton discharging device of the printing line according to claim 1, characterized in that: The stacking part is a slope platform structure composed of a feed surface and a stacking surface, and the adjusting component includes an adjusting component one for adjusting the feed surface and an adjusting component two for adjusting the stacking surface; the bottom of the stacking part is connected to the discharge port of the feed conveyor belt, and the lower stop plate is arranged on the top of the stacking part and fixed on the discharge conveyor belt through a support beam, and the lower stop plate is connected to the feed port of the discharge conveyor belt.

6. The carton discharging device of the printing line according to claim 5, characterized in that: The adjusting component 1 includes a belt shaft 1 and a belt shaft 2 which support the stacking conveyor belt to form a feeding surface. The belt shaft 1 is close to the feeding conveyor belt, and the belt shaft 2 is arranged obliquely above the belt shaft 1. The belt shaft 1 and the belt shaft 2 are connected to the adjusting slide seat 1 through a bearing seat, and the adjusting slide seat 1 is provided with a slide bar 1 which is slidably connected to the adjusting bracket 1; the adjusting component 2 includes a belt shaft 3, and the belt shaft 3 and the belt shaft 2 support the stacking conveyor belt to form a stacking surface. The belt shaft 3 is connected to the adjusting slide seat 2 through a bearing seat, and the adjusting slide seat 2 is provided with a slide bar 2 which is slidably connected to the adjusting bracket 2. The adjusting bracket 2 is also connected to the support beam of the lower stop plate through a transfer plate.

7. The carton discharging device of the printing line according to claim 1, characterized in that: The stop mechanism includes a rotary cylinder, a cylinder fixing seat, a rotary rod, and a paper stop rod. The rotary cylinder is fixed on one side of the cylinder fixing seat, and its output end is connected to one end of the rotary rod. The other end of the rotary rod is connected to the other side of the cylinder fixing seat through a bearing seat. The paper stop rod is at least provided with one and is fixed on the rotary rod.

8. The carton discharging device of the printing line according to claim 1 or 7, characterized in that: It also includes a paper pressing mechanism, which is arranged above the stacking part and is movably connected to the top of the stacked cartons to press against the top of the stacked cartons.

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