JP7703483B2 - Method and system for supplying container paper material - Google Patents

Description

This relates to a method and system for supplying container paper materials, which uses a suction pad to sequentially adsorb container paper materials stacked in a storage section, starting from the bottom layer, and supply them onto a production line.

Containers such as paper cups and paper trays have been used for a long time. During production, the fan-shaped container paper material that constitutes the body of such a paper cup is first stored in a storage section in a stacked state, as shown in the technology disclosed in Patent Document 1. The stored container paper material is guided by a guide rail, and the bottom layer is temporarily secured by a locking claw. The top layer of the container paper material is pressed by a spring to maintain a stable stacked state. The container paper material in this stacked state is successively adsorbed by a suction pad, starting from the bottom layer, and pulled out against the temporary securing force of the locking claw, and then sequentially supplied to the production line.

Incidentally, in recent years, the fan-shaped container paper that constitutes the body of this paper cup is often printed with various printing methods for decoration, advertising, etc. This printing is done on the surface of the container paper that constitutes the container by methods such as silk screen printing, pad printing, offset printing, hot dry printing, inkjet printing, painting, etc. As a result, the printing paint penetrates only the surface of the container paper, and not particularly the back side, and as a result of the difference in paint content on the front and back of the container paper, both side edges 71 of the container paper 7 warp toward the front side of the paper surface, as shown in Figure 28.

When container paper material 7 with such warped side edges 71 is stacked in a storage section 8 as shown in Figure 29, a gap will be created between the side edges 71 of the container paper material 7 and the suction pad 81. As a result, it becomes difficult for the suction pad 81 to adsorb the side edges 71 of the container paper material 7, and it will not be possible to supply it onto the production line.

Therefore, there has been a demand for technology that can reliably adsorb container paper material 7 stacked in storage section 8 on both side edges 71 when the material is warped, using suction pads 81 to steadily supply the material to the production line, but this technology has not yet been proposed.

Special Publication No. 06-75934

The present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a method and system for supplying container paper materials that can be reliably adsorbed by suction pads and stably supplied to the production line even when both side edges of the container paper materials stacked in the storage section are warped.

To solve the above-mentioned problems, the inventors have invented a method and system for supplying container paper that can correct warping on both side edges of a stack of container paper stacked in a storage section by driving the stack toward the bottom layer while pressing both side edges with side pads, and pressing the top and/or bottom ends of the stack of container paper with a front pad.

The container paper material supplying method of the first invention is a method for supplying container paper material in which container paper material stacked in a storage section is successively adsorbed from the bottom layer by an suction pad and supplied to a production line, characterized in that by driving a bundle of container paper material stacked in the storage section, in which warping has occurred on the paper surface , toward the bottom layer while both side ends are pressed by side pads, the bundle is corrected in warping of the both side ends toward the back side of the paper surface while the upper and/or lower end of the bundle of container paper material is pressed by a front pad.

The method for supplying container paper material according to the second invention is characterized in that, in the first invention, the top and/or bottom ends of the container paper material bundle are pressed by the front pad, the side pads are driven toward the top layer while separated from both side ends of the container paper material bundle, and the side pads are driven toward the bottom layer while being pressed inward by the side pads, while the front pads are repeatedly pressed against the top layer.

The container paper material supplying method of the third invention is a method for supplying container paper material stacked in a storage section by sequentially adsorbing container paper material stacked in a storage section from the bottom layer using suction pads and supplying it to a production line, characterized in that the upper and lower ends of a stack of container paper material stacked in the storage section, which has a warp on the back side of its paper surface , are pressed from both sides by first front pads and driven toward the bottom layer , thereby correcting the warp on both side ends toward the front side of the paper surface , while pressing between the first front pads at the upper and lower ends of the stack of container paper material with a second front pad.

The method of supplying container paper material according to the fourth invention is characterized in that, in the third invention, the upper and lower ends of the container paper material stack are pressed by the second front pad, and then the first front pad is driven toward the surface layer while spaced away from the container paper material stack, and then the first front pad is driven toward the bottom layer while pressing the container paper material stack with the first front pad, while pressing the container paper material stack with the second front pad, and the process is repeatedly performed.

The container paper material supplying method of the fifth invention is a method for supplying container paper material in which container paper material stacked in a storage section is successively adsorbed from the bottom layer by an suction pad and supplied to a production line, characterized in that the upper and lower ends of a stack of container paper material stacked in the storage section, which has a warped paper surface, are pressed by a front pad while being driven toward the bottom layer, and both side ends of the stack of container paper material are pressed by side pads , thereby correcting the warping of both side ends toward the back side of the paper surface .

The container paper material supplying system of the sixth invention is a container paper material supplying system for sequentially adsorbing container paper material stacked in a storage section starting from the bottom layer using a suction pad and supplying it onto a production line, the container paper material supplying system for sequentially adsorbing container paper material stacked in a storage section starting from the bottom layer using a suction pad and supplying it onto the production line, characterized in that it comprises side pads that press both side ends of a bundle of container paper material stacked in the storage section, which has warped on its paper surface , and drive it toward the bottom layer while pressing the both side ends, thereby correcting the warping of the both side ends toward the back side of the paper surface , and a front pad that presses the upper and/or lower end of the bundle of container paper material driven by the side pad.

The container paper material supplying system of the seventh invention is a container paper material supplying system for sequentially adsorbing container paper material stacked in a storage section starting from the bottom layer using a suction pad and supplying it to a production line, characterized in that it comprises a first front pad that presses the upper and lower ends of a bundle of container paper material stacked in the storage section, which has warped on the back side of the paper surface, from both sides and drives it toward the bottom layer , thereby correcting the warping of both side ends toward the front side of the paper surface , and a second front pad that presses between the first front pads at the upper and lower ends of the bundle of container paper material driven by the first front pad.

The container paper material supplying system of the eighth invention is a container paper material supplying system for sequentially adsorbing container paper material stacked in a storage section starting from the bottom layer using a suction pad and supplying it to a production line, characterized in that it comprises a front pad that drives toward the bottom layer while pressing the upper and lower ends of a stack of container paper material stacked in the storage section where warping has occurred on the paper surface , and side pads that press both side ends of the stack of container paper material to correct the warping of the both side ends toward the back side of the paper surface .

According to the present invention having the above-mentioned configuration, the side end of the container paper stack stacked in the storage section is driven toward the bottom layer while being pressed by the side pad. As a result, the side end of the container paper is pushed toward the bottom layer, making it possible to correct the warp toward the front side of the paper toward the back side of the paper. In addition, the front pad applies a pressing force to the container paper stack, so that the corrected state can be maintained. By repeatedly performing this operation on the container paper stack, the warp that occurs in the container paper 2 that constitutes it is almost never returned to the front side of the paper.

This makes it possible to prevent gaps from occurring between the side edges of container paper material that has no warping when the suction pad is brought close to the side edges of the container paper material. As a result, the container paper material that has no warping on the side edges can be reliably adsorbed by the suction pad and steadily supplied to the production line. This makes it possible to prevent a decrease in the production efficiency of the production line from being caused by a delay in the supply of container paper material to the production line due to the container paper material not being adsorbed by the suction pad.

FIG. 1 is a plan view of a production line to which a supply system according to the present invention is applied. FIG. 2 is a diagram for explaining an example of a paper container manufactured on a production line. FIG. 3 is a perspective view of a supply system to which the present invention is applied. FIG. 4 is a front view of a container constituting a supply system to which the present invention is applied. FIG. 5 is a plan view of a supply system to which the present invention is applied. FIG. 6(a) is a diagram showing an example of applying a tensile force through a rotary feeder, and FIG. 6(b) is a diagram showing an example of pulling out container paper material by the rotary feeder against the temporary fastening force of a locking claw. FIG. 7 is a time chart showing how forward warping is corrected through the operations of the front pad and side pad. FIG. 8 is a perspective view showing an example in which the side edge of a bundle of container paper materials is pressed by a side pad. FIG. 9 is a front view showing an example in which the side edge of the container paper bundle is pressed by a side pad. FIG. 10 is a plan view showing an example in which the side edge of the container paper bundle is pressed by a side pad. FIG. 11 is a perspective view showing an example in which a side pad is driven toward the bottom layer side to correct a container paper bundle pressed against the side pad. FIG. 12 is a plan view showing an example in which a side pad is driven toward the bottom layer side to correct a bundle of container paper materials pressed against it. FIG. 13 is a perspective view showing an example in which the top end of a container paper stack is pressed by a front pad while the side end of the container paper stack is driven toward the bottom layer in a state in which the side end of the container paper stack is pressed by a side pad. FIG. 14 is a front view showing an example in which the top end of a container paper bundle is pressed by a front pad while the side end of the container paper bundle is driven toward the bottom layer in a state in which the side pads press the side end of the container paper bundle. FIG. 15 is a plan view showing an example in which the top end of a container paper bundle is pressed by a front pad while the side end of the container paper bundle is driven toward the bottom layer in a state in which the side pads press the side end of the container paper bundle. FIG. 16 is a plan view showing an example in which the side pads are spaced apart from the container paper stack. FIG. 17 is a perspective view showing an example in which the side pads are spaced apart from the container paper stack. FIG. 18 is a plan view showing an example in which the side pads are spaced apart from the container paper stack. FIG. 19 is a diagram for explaining a configuration for straightening out a warp in a case where the container paper material is warped in the opposite direction. FIG. 20 is a front view showing an example of a configuration for correcting reverse warpage in a supply system to which the present invention is applied. FIG. 21 is a time chart showing how the front pad operates to correct the warp in the reverse direction. FIG. 22 is a diagram for explaining the operation of correcting the warp in the opposite direction through the front pad. FIG. 23 is another diagram for explaining the operation of correcting the warp in the opposite direction through the front pad. FIG. 24 is a diagram showing a configuration in which a front pad that can be moved toward and away from the lower end of the container paper stack is further provided. FIG. 25 is a time chart showing how the warp is corrected by driving the front pad. FIG. 26 is a diagram for explaining the operation of correcting warpage by driving the front pad. FIG. 27 is another diagram for explaining the operation of correcting warpage by driving the front pad. FIG. 28 is a diagram for explaining the problems with the conventional technology. FIG. 29 is a diagram for explaining a case where the suction pad cannot perform suction when the container paper material is warped.

Below, we will explain in detail the container paper material supply system to which the present invention is applied, with reference to the drawings.

Figure 1 is a plan view of a manufacturing line 10 to which the supply system 1 according to the present invention is applied.

The manufacturing line 10 is a line for manufacturing paper containers 5, for example, as shown in FIG. 2(a). The paper container 5 is a paper container for storing beverages, snacks, etc., and is a so-called paper cup. The paper container 5 has a body 51 formed in a cylindrical shape and a bottom plate 52 provided on the lower end side of the body 51. The body 51 is formed so that its diameter increases toward the top, but is not limited to this, and it may be formed in a cylindrical shape or the like without increasing in diameter in the vertical direction. Various types of printing P are applied to the surface of the body 51 for purposes such as decoration and advertising.

Figure 2(b) is a development of the container paper material 2 that constitutes the body 51. The container paper material 2 has a fan-shaped outer shape, with one side end 21 and the other side end 22 formed in a straight line, and the upper end 23 and lower end 24 formed in an arc shape. Note that the container paper material 2 is not limited to this, and the outer shape of the development may be formed in a rectangular shape, etc. Furthermore, it goes without saying that the paper container 5 that constitutes the container paper material 2 may be used for any other paper container other than the paper cup.

The above-mentioned printing P is applied to the front side of the container paper material 2. This printing P is applied by means of, for example, silk screen printing, pad printing, offset printing, thermal printing, inkjet printing, painting, etc.

The production line 10 is a line that receives container paper material 2 having such a shape and winds it around the body of a paper container to form a double-layered container with a cylindrical sleeve, or a line that winds the container paper material 2 to form a cylindrical body 51 and finally automatically fits a bottom plate 52. The production line 10 has a storage section 11 where the container paper material 2 is first stored, and a rotary feeder 12 that sequentially pulls out the container paper material 2 stored in the storage section 11 one by one and supplies it onto the production line. The container paper material 2 pulled out by the rotary feeder 12 is formed into a paper container of the desired shape in the subsequent production line 10.

The supply system 1 to which the present invention is applied is applied to the storage section 11 and the rotary feeder 12 in this production line 10.

Figure 3 is a perspective view of this supply system 1, Figure 4 is a front view of the storage section 11 constituting the supply system 1 as viewed from the rotary feeder 12 side in Figure 3, and Figure 5 is a plan view of the supply system 1 as viewed from direction B in Figure 3.

The storage section 11 that constitutes the supply system 1 includes a guide rail 31, a locking claw 32, a side pad 33, a front pad 34, a drive unit 35 for driving the side pad 33, and a drive unit 36 for driving the front pad 34.

The guide rail 31 is supplied with the container paper material 2. The guide rail 31 is provided in a plurality of lengths according to the outer shape of the container paper material 2. The guide rail 31 is provided higher than the rotary feeder 12, and as a result, the extension direction of the guide rail 31 faces downward toward the rotary feeder 12. However, the extension direction of the guide rail 31 may be configured to face diagonally downward, other than vertically downward. When the container paper material 2 is fed from above into the area surrounded by the guide rail 31, it is guided by the guide rail 31 extended downward, and is locked by the locking claw 32 provided near the extended end as shown in FIG. 3. By sequentially feeding the container paper material 2 onto the guide rail 31, the container paper material 2 is guided by the guide rail 31, and is stacked on the container paper material 2a at the bottom layer locked by the locking claw 32 to form the container paper material bundle 20.

As shown in FIG. 5, the container paper material 2 is fed so that the front side of the paper surface is oriented toward the front layer of the stacked container paper material bundle 20, and the back side of the paper surface is oriented toward the bottom layer of the container paper material 2. The paint of the printing P penetrates only the front side of the container paper material 2, and the paint does not penetrate particularly into the back side of the paper surface. As a result of the difference in paint content between the front and back of the container paper material 2, both side end portions 21 and 22 of the container paper material 2 may warp toward the front side of the paper surface. In such a case, the container paper material bundle 20 obtained by stacking the container paper material 2 fed into this guide rail 31 has both side end portions 21 and 22 warped toward the front side of the paper surface as a whole, as shown in FIG. 5.

The side pad 33 is a pad for pressing each side end 21, 22 of the container paper bundle 20 (container paper material 2) stacked in the storage section 11 and driving it toward the bottom layer side. The tip of the side pad 33 that contacts each side end 21, 22 of the container paper bundle 20 is made of an elastic body such as rubber or resin. The three-dimensional shape of the tip of the side pad 33 may be any shape, but it is preferable that the part that contacts each side end 21, 22 of the container paper bundle 20 is made of a flat surface from the viewpoint of increasing the adhesion caused by pressing. In addition, the contact position of each side end 21, 22 of the container paper bundle 20 (container paper material 2) by the side pad 33 is not particularly limited, but it is preferable that the upper end 23 side can be pressed rather than the lower end 24 as shown in FIG. 4. This allows the side pad 33 and the front pad 34 to be close to each other. As described below, when correcting the warp of the container paper material 2, the side pads 33 or front pads 34 are used to maintain the warp, and the proximity of these pads makes it possible to effectively maintain the warp.

The front pad 34 is a pad for pressing the upper end 23 of the container paper bundle 20 (container paper 2) stacked in the storage section 11. The tip of the front pad 34 that contacts the upper end 23 of the container paper bundle 20 is made of an elastic body such as rubber or resin. The three-dimensional shape of the tip of the front pad 34 may be any shape, but it is preferable that the part that contacts the upper end 23 of the container paper bundle 20 is made of a flat surface in order to improve adhesion caused by pressing. The container paper bundle 20 to which the pressing force is applied by the front pad 34 may be supported from below via a guide rail 31, a locking claw 32, or a support means (not shown) located on the underside of the container paper bundle 20.

The drive unit 35 is a mechanism for driving the side pads 33, and is composed of a cylinder (not shown) or the like. The control by the drive unit 35 may be performed based on a control signal sent from the control unit 19 described above. The drive unit 35 is configured to be able to drive the side pads 33 in a direction approaching each side end 21, 22 of the container paper material bundle 20 (container paper material 2) toward the inside, and is also configured to be able to drive the side pads 33 in a direction moving away from each other toward the outside. In addition, the drive unit 35 is configured to be able to drive the side pads 33 toward the bottom layer side or the surface layer side of the container paper material bundle 20.

The drive unit 36 is a mechanism for driving the front pad 34, and is composed of a cylinder (not shown) or the like. The control by the drive unit 36 may be performed based on a control signal sent from the control unit 19 described above. The drive unit 36 is configured to be capable of driving the front pad 34 in a direction approaching the upper end portion 23 of the container paper material stack 20 (container paper material 2) toward the inside, and is also configured to be capable of driving the front pad 34 in a direction moving away from the upper end portion 23 toward the outside.

The rotary feeder 12 is equipped with a plurality of suction pads 41. The suction pads 41 are provided with suction ports (not shown) for sucking in air to generate suction force. When the container paper material 2 is brought into contact with the suction pads 41, various operations can be performed to adsorb the container paper material 2 using the suction force and move it to the desired location. There are usually a plurality of rotary feeders 12 equipped with such suction pads 41, and each rotary feeder 12 usually rotates to adsorb and move the container paper material 2.

The rotary feeder 12, through such suction pads 41, sequentially adsorbs the container paper material 2 stacked in the storage section 11, starting from the bottom layer, as shown in FIG. 6(a). The container paper material 2a in the bottom layer is held in place by the locking claws 32, but when it comes into contact with the suction pad 41, it is adsorbed by it and a tensile force is applied in the direction of the arrow in FIG. 6(a) via the rotary feeder 12. As a result, as shown in FIG. 6(b), the rotary feeder 12 can pull out the container paper material 2a against the temporary holding force of the locking claws 32. The rotary feeder 12 can supply the container paper material 2a pulled out in this way to the gripper turret 13.

In the supply system 1 to which the present invention is applied, when the container paper material 2 is pulled out and supplied onto the production line in this manner, the warping that occurs on both side ends 21, 22 of the container paper material 2 is corrected based on the operation described below.

Figure 7 shows time charts for the contact operation of the suction pad 41, the pressing operation by the side pad 33, the driving operation toward the bottom layer by the side pad 33, and the pressing operation by the front pad 34.

The suction pad 41 repeatedly contacts the container paper material 2a at 0.5 second intervals, pulls it out, and supplies it to the production line. During this time, the side pad 33 and front pad 34 repeatedly perform the operations described below, with one term being 10 seconds.

First, at timing T1 between 0 and 0.5 seconds, the pressing action of the side pad 33 is turned ON. At this timing T1, the driving action toward the bottom layer by the side pad 33 and the pressing action by the front pad 34 are turned OFF. In this case, as shown in the perspective view in FIG. 8, the front view in FIG. 9(a), and the plan view in FIG. 10(a), the side pad 33 drives toward the side end 21 (22) of the container paper bundle 20 stacked in the storage section 11. Then, as shown in FIG. 9(b) and FIG. 10(b), the side pad 33 is brought into contact with the side end 21 (22) of the container paper bundle 20 and presses it.

Next, at timing T2, which is 0.5 to 1 second, the drive operation of the side pads 33 toward the bottom layer is turned ON. At this timing T2, the pressing operation by the side pads 33 continues to be ON. Therefore, at timing T2, the side ends 21, 22 of the container paper bundle 20 stacked in the storage section 11 are being pressed by the side pads 33 while being driven toward the bottom layer.

In such a case, as shown in the perspective view of FIG. 11 and the plan view of FIG. 12, the side pad 33 is driven toward the bottom layer, and the side ends 21, 22 of each container paper material 2 constituting the container paper material bundle 20 pressed against it are pushed toward the bottom layer. As a result, as shown in FIG. 12, the warping of the side ends 21, 22 of the container paper material bundle 20 toward the front side of the page is corrected toward the back side of the page.

Next, at timing T3, which is 1 to 1.5 seconds, the pressure from the front pad 34 is turned ON. At this timing T3, the pressing operation by the side pad 33 and the driving operation toward the bottom layer by the side pad 33 continue to be ON. In this case, as shown in the perspective view in FIG. 13, the front view in FIG. 14, and the plan view in FIG. 15, the side ends 21 and 22 of the container paper stack 20 are pressed by the side pad 33 while being driven toward the bottom layer, and the top end 23 of the container paper stack 20 is pressed by the front pad 34.

In other words, the side pads 33 correct the curl of the side ends 21, 22 of the container paper bundle 20 toward the front side of the page, but the front pads 34 press the top end 23 of the container paper bundle 20, so that the corrected state is maintained. The front pads 34 apply a pressing force from the top end 23 to the entire container paper bundle 20, so that the curl of the side ends 21, 22 of the container paper bundle 20 can be prevented from returning to the front side of the page.

Next, at timing T4, between 1.5 and 10 seconds, the pressing action of the side pad 33 and the driving action toward the bottom layer by the side pad 33 are both turned OFF, and the side pad 33 is separated from the container paper bundle 20 as shown in Figures 16 and 17. At this time, the pressing action by the front pad 34 is kept ON. As explained at timing T3, the front pad 34 applies a pressing force from the top end 23 side to the entire container paper bundle 20, so that the warping of the side ends 21 and 22 of the container paper bundle 20 is prevented from returning to the front side of the paper surface, and therefore the straightened state is maintained even if the side pad 33 is separated from the container paper bundle 20.

At this timing T4, as shown in the perspective view of FIG. 16 and the plan view of FIG. 17, the side pad 33, which is spaced away from the container paper stack 20, is driven toward the surface layer.

After timing T4 ends, the 10-second term ends and transitions to timing T1 of the next term. When transitioning from timing T4 to timing T1, pressure from the front pad 34 is turned OFF and pressure from the side pad 33 is turned ON. At timing T4, the side pad 33 has been driven toward the surface and returned to its original position, so that transition can immediately take place to the operation shown at timing T1. Thereafter, the operations of timings T1 to T4 described above are repeated.

In this way, according to the supply system 1 to which the present invention is applied, the side ends 21 and 22 of the container paper bundle 20 stacked in the storage section 11 are driven toward the bottom layer side while being pressed by the side pad 33 through the operation at timings T2 and T3. As a result, the side ends 21 and 22 of the container paper 2 are pushed toward the bottom layer side, and the warp toward the front side of the paper surface can be corrected toward the back side of the paper surface. In addition, through the operation at timings T3 and T4, the front pad 34 applies a pressing force to the container paper bundle 20, so that the corrected state can be maintained. By repeatedly performing such an operation on the container paper bundle 20, the warp toward the front side of the paper surface that occurs in the container paper 2 that constitutes it is almost never returned. If the front pad 34 or the side pad 33 is only temporarily corrected, and the front pad 34 and the side pad 33 are simultaneously separated, the warp that was once corrected may return. For this reason, it is necessary to continue repeatedly performing the above-mentioned operation.

As a result, when the suction pad 41 is brought close to container paper material 2a with no warping at the side ends 21, 22 as shown in FIG. 6, it is possible to prevent gaps from occurring between the side ends 21, 22 and the suction pad 41. As a result, container paper material 2a with no warping at the side ends 21, 22 can be reliably adsorbed by the suction pad 41 and stably supplied to the production line. This prevents a decrease in production efficiency by the production line due to a delay in the supply of container paper material 2 to the production line caused by the inability of the suction pad 41 to adsorb the container paper material 2a.

When the thickness of the container paper material 2 is 0.2 mm and the length of the side pad 33 is 45 mm, 225 sheets of container paper material 2 can be pressed at once and driven to the bottom layer side. According to the time chart, the number of sheets of container paper material 2 that are adsorbed by the suction pad 41 and removed by the production line is 20 sheets per term (10 seconds), so it can be seen that each container paper material 2 goes through multiple terms before being supplied to the production line. Each container paper material 2 is subjected to the correction operation by the side pad 33 multiple times before being supplied to the production line.

The drive length (stroke length) of the drive operation toward the bottom layer by the side pad 33 from timing T2 to timing T3 is not particularly limited, but a length of about 10 mm is sufficient to correct the warp that has occurred in the side ends 21, 22 of the container paper material 2. If the amount of warp occurring in the container paper material 2 is 10 mm or less, it can be sucked up and moved by the stable suction pad 41. For this reason, it is desirable to suppress the amount of warp by correction to 10 mm or less. If the amount of warp is 20 mm, the amount of warp after correction can be reduced to 10 mm by setting the drive length to 10 mm. The drive length is set to 10 mm in order to shorten the time interval between operations.

Note that the time chart shown in FIG. 7 above is an example, and the period of each of the timings T1 to T4 can be any period as long as the operations performed at each of the timings T1 to T4 are executed.

The present invention is not limited to the above-mentioned embodiment. For example, it can be applied in the same way when the warp occurs in the opposite direction as shown in FIG. 19. In this opposite warp, the side ends 21, 22 are warped toward the back side of the paper. Note that the opposite warp here also includes the case where the paper is warped in the forward direction toward the front side of the paper and the front and back sides of the paper are stored in the opposite way to the case shown in FIG. 5. In other words, the same method can be used to correct the container paper material 2 that has warped in the forward direction toward the front side of the paper and is stored with the front side of the paper facing down (bottom layer side) and the back side of the paper facing up (front layer side).

When such reverse warping occurs, a storage section 11 as shown in FIG. 20 is used. In this storage section 11, the side pads 33 are omitted, and front pads 34 are arranged above and below. The front pads 34 are divided into front pad 34b, which is located approximately in the center, and front pads 34a, which are located on both sides of it. That is, the front pad 34a is configured so that it can freely press the upper end 23 and lower end 24 from both sides, and the front pad 34b is configured so that it can freely press the upper end 23 and lower end 24, which are closer to the center and are between the front pads 34a.

If reverse warping has occurred, the processing operations at timings T1 to T4 in the time chart shown in Figure 21 are executed. First, at timing T1, pressure is applied by the front pad 34a. At timing T1, the front pad 34a is brought into contact with the upper end 23 and lower end 24 of the container paper stack 20 as shown in Figure 22(a) and applied pressure.

Next, at timing T2, as shown in FIG. 22(b), the front pad 34a pressing the upper end 23 and lower end 24 of the container paper stack 20 is driven toward the bottom layer. The front pad 34a presses the upper end 23 and lower end 24 closer to the side ends 21 and 22 while driving toward the lower layer, so that the warping of the center portions of the upper end 23 and lower end 24 of the container paper stack 20 toward the front side of the page is corrected toward the back side of the page.

Next, at timing T3, as shown in FIG. 23(a), the upper end 23 and lower end 24 of the container paper bundle 20 from the side ends 21, 22 are pressed by the front pad 34a while the container paper bundle 20 is driven toward the bottom layer, and the upper end 23 and lower end of the container paper bundle 20 are pressed by the front pad 34b. The front pad 34b applies a pressing force from the upper end 23 and lower end 24 to the entire container paper bundle 20, making it possible to prevent the warping in the center of the upper end 23 and lower end 24 of the container paper bundle 20 from returning to the front side of the paper.

Next, at timing T4, as shown in FIG. 23(b), the front pad 34a is moved away from the container paper bundle 20 and driven toward the surface side. During this time, the front pad 34b applies a pressing force to the container paper bundle 20 from the upper end 23 and lower end 24 sides, which prevents the warping in the center of the upper end 23 and lower end 24 of the container paper bundle 20 from returning to the surface side of the paper, and the straightened state is maintained as it is.

After timing T4 ends, the 10-second term ends and transitions to timing T1 of the next term. When transitioning from timing T4 to timing T1, pressure from front pad 34b is turned OFF and pressure from front pad 34a is turned ON. At timing T4, front pad 34a has been driven toward the surface and returned to its original position, so it is possible to immediately transition to the operation shown at timing T1. Thereafter, the operations of timings T1 to T4 described above are repeated.

By repeating this operation, even if the container paper material 2 is warped in the opposite direction at the center of the upper end 23 or lower end 24, the warp will hardly return to the front side of the paper. This makes it possible to prevent gaps from occurring between the center of the upper end 23 or lower end 24 and the suction pad 41 when the suction pad 41 is brought close to container paper material 2a that is not warped at the center of the upper end 23 or lower end 24. As a result, container paper material 2a that is not warped at the center of the upper end 23 or lower end 24 can be reliably adsorbed by the suction pad 41 and stably supplied to the production line.

In addition, when the side ends 21 and 22 are curled toward the back of the paper, that is, when a so-called reverse curl occurs, this can be achieved by driving the container paper bundle 20 toward the bottom layer while pressing the top end 23 and bottom end 24 at the center of the container paper bundle 20 with the front pad 34b, and pressing the top end 23 and bottom end 24 at both ends of the container paper bundle 20 with the front pad 34a. The detailed operation flow will be omitted below by replacing the drive toward the bottom layer by the front pad 34a in the time chart shown in Figure 21 with drive toward the bottom layer by the front pad 34b, and the pressing by the front pad 34b with pressing by the front pad 34a. In such a case, the container paper 2a can be reliably adsorbed by the suction pad 41 and stably supplied to the production line.

In the operation of eliminating the forward warp, the storage section 11 is not limited to the configuration described above, and as shown in FIG. 24, a front pad 38 that can be moved toward and away from the bottom end 24 of the container paper stack 20 may be further provided. This front pad 38 can be driven by a drive section 39 to press against the bottom end 24 of the container paper stack 20.

For this reason, in addition to pressing only the upper end 23 of the container paper stack 20 by the front pad 34 described above, the front pad 38 may also press the lower end 24 of the container paper stack 20 at the same time. The timing of pressing the front pad 38 is simultaneous with the front pad 34.

In addition, in the operation of eliminating forward warping, the configuration of the front pad 34 may be omitted, and pressing may be performed only by the front pad 38. In such a case, as an alternative to the front pad 34, the container paper stack 20 to which the pressing force of the front pad 38 is applied may be supported from above via the guide rail 31, the locking claw 32, or a support means (not shown).

Of course, the above-mentioned effects can also be obtained by applying pressure using the front pad 38.

In addition, in the operation of eliminating the forward warp, the side pad 33 is assumed to press the upper side of the side ends 21, 22 of the container paper bundle 20, but this is not limited to the above. As shown in FIG. 24, in addition to the side pad 33a that presses the upper side of the side ends 21, 22 of the container paper bundle 20, a side pad 33b that presses the lower side may be provided separately. The side pads 33a and 33b perform the same operation as described above.

As a result, if significant warping occurs in the side ends 21 and 22 of the container paper stack 20, it is possible to correct this via the side pad 33b.

Of course, it is also possible to omit the side pad 33a and use only the side pad 33b for pressure and drive.

In the above embodiment, an example is given in which the side ends 21, 22 of the container paper stack 20 are pressed by the side pad 33 while the stack is driven toward the bottom layer, and the top end 23 and/or bottom end 24 of the container paper stack 20 are pressed by the front pad, but this is not limiting.

A similar effect can be achieved by driving the container paper stack 20 toward the bottom layer while pressing it with the front pads 34 and 38, and pressing the side ends 21 and 22 of the container paper stack 20 with the side pad 34. In this case, the top end 23 of the container paper stack 20 is pressed by the front pad 34 shown in FIG. 24, and the bottom end 24 of the container paper stack 20 is pressed by the front pad 38, while the container paper stack 20 is driven toward the bottom layer.

In such a case, the processing operations of timing T1 to timing T4 in the time chart shown in Figure 25 are executed. First, at timing T1, pressing is performed by the front pads 34, 38. At timing T1, as shown in the side view of Figure 26 (a), the front pads 34, 38 are brought into contact with the upper end 23 and lower end 24 of the container paper bundle 20, respectively, and pressed against them. At this time, it is desirable that the contact positions of the front pads 34, 38 with the container paper bundle 20 be closer to the outer layer.

Next, at timing T2, as shown in FIG. 26(b), the front pads 34, 38 pressing the upper end 23 and lower end 24 of the container paper stack 20 are driven toward the bottom layer. As a result, the warping of the upper end 23 and lower end 24 of the container paper stack 20 toward the front side of the page is corrected toward the back side of the page.

Next, at timing T3, as shown in FIG. 27(a), the top end 23 and bottom end 24 of the container paper stack 20 are pressed by the front pads 34 and 38 while the stack is driven toward the bottom layer, and the side ends 21 and 22 of the container paper stack 20 are pressed by the side pads 33. The side pads 33 apply a pressing force from the side ends 21 and 22 to the entire container paper stack 20, making it possible to prevent the warp in the container paper stack 20 from returning to the front side of the paper surface.

Next, at timing T4, as shown in FIG. 27(b), the front pads 34, 38 are moved away from the container paper stack 20 and driven toward the front layer. During this time, the side pads 33 apply a pressing force to the container paper stack 20 from the side ends 21, 22, which prevents the warp in the container paper stack 20 from returning to the front side of the paper surface, and the straightened state is maintained.

After timing T4 ends, the 10-second term ends and transitions to timing T1 of the next term. When transitioning from timing T4 to timing T1, pressure from the side pads 33 is turned OFF and pressure from the front pads 34, 38 is turned ON. At timing T4, the front pads 34, 38 have been driven toward the surface and are returned to their original positions, so that transition can immediately take place to the operation shown at timing T1. Thereafter, the operations of timings T1 to T4 described above are repeated.

By repeating this operation, even if warping occurs at the side ends 21, 22 of the container paper material 2, the warping will hardly return to the front side of the paper surface. This allows the container paper material 2a to be reliably adsorbed by the suction pad 41 and stably supplied to the production line.

Reference Signs List 1: Supply system 2: Container paper material 5: Paper container 10: Production line 11: Storage section 12: Rotary feeder 19: Control section 20: Container paper material stack 21, 22: Side end 23: Upper end 24: Lower end 31: Guide rail 32: Locking claw 33: Side pads 34, 38: Front pads 35, 36, 39: Drive section 41: Suction pad 51: Body section 52: Bottom plate

Claims (8)

A method for supplying container paper materials to a manufacturing line by sequentially sucking container paper materials stacked in a storage section from the bottom layer by a suction pad, comprising:
A method for supplying container paper material , comprising the steps of : driving a stack of container paper material stacked in the storage section, in which warping has occurred on the paper surface, toward the bottom layer while pressing both side ends with side pads, thereby correcting the warping of both side ends toward the back side of the paper surface, while pressing the top and/or bottom ends of the stack of container paper material with a front pad. After pressing the upper end and/or the lower end of the container paper bundle with the front pad, the side pads are driven toward the surface layer while being spaced apart from both side ends of the container paper bundle,
2. The method for supplying container paper material according to claim 1, further comprising the steps of driving the side pads toward the bottom layer while pressing the side pads inwardly and pressing the front pad against the bottom layer, and repeating this process. A method for supplying container paper materials to a manufacturing line by sequentially sucking container paper materials stacked in a storage section from the bottom layer by a suction pad, comprising:
A method for supplying container paper material , comprising the steps of: driving a stack of container paper material stacked in the storage section, the upper and lower ends of which have a warp on the back side of the paper surface, toward the bottom layer while being pressed from both sides by a first front pad, thereby correcting the warp on both side ends toward the front side of the paper surface , while pressing the space between the first front pads at the upper and lower ends of the stack of container paper material with a second front pad. After pressing the upper end and the lower end of the container paper bundle with the second front pad, the first front pad is driven toward the surface layer side while being separated from the container paper bundle,
4. The method for supplying container paper material according to claim 3 , further comprising the steps of driving the container paper material bundle toward the bottom layer while the bundle is pressed by the first front pad and then pressing the bundle by the second front pad, and repeating the steps. A method for supplying container paper materials to a manufacturing line by sequentially sucking container paper materials stacked in a storage section from the bottom layer by a suction pad, comprising:
A method for supplying container paper material , comprising the steps of: driving a stack of container paper material stacked in the storage section, in which a warp has occurred on the paper surface , toward the bottom layer while pressing the top and bottom ends of the stack of container paper material with a front pad; and pressing both side ends of the stack of container paper material with side pads, thereby correcting the warp on both side ends toward the back side of the paper surface . A container paper material supply system for supplying container paper materials stacked in a storage section onto a production line by sequentially sucking the container paper materials from the bottom layer by a suction pad, comprising:
side pads that press both side edges of the stack of container paper material having warped paper surface stacked in the storage section and drive the stack toward the bottom layer to correct the warping of both side edges toward the back side of the paper surface;
a front pad that presses the upper end and/or lower end of the stack of container paper materials driven by the side pads. A container paper material supply system for supplying container paper materials stacked in a storage section onto a production line by sequentially sucking the container paper materials from the bottom layer by a suction pad, comprising:
a first front pad for pressing the upper and lower ends of the stack of container paper material having a warped back surface stacked in the storage section from both sides and driving the stack toward the bottom layer to correct the warping of both ends toward the front surface of the paper surface ;
a second front pad for pressing between the first front pads at the upper and lower ends of the stack of container paper driven by the first front pad. A container paper material supply system for supplying container paper materials stacked in a storage section onto a production line by sequentially sucking the container paper materials from the bottom layer by a suction pad, comprising:
a front pad that drives the container paper bundle , the paper bundle having a warped paper surface stacked in the storage section, toward the bottom layer while pressing the top and bottom ends of the bundle;
and a side pad that presses both side edges of the container paper bundle to correct the warping of the both side edges toward the back side of the paper.
A container paper material supply system comprising :

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