JP2020111358A - Bag lifting method and device - Google Patents

Abstract

To provide a bag lifting method and a device that can securely lift a bag after contents are filled in a case on which the bag is hung without damaging outside of the bag.SOLUTION: A case 50 has a case body 51 and four flaps 52a, 52b that cover an upper end opening of the case body. A bag 60 hung on the case has an outer part 62 that is folded back at an upper end of the case body and surrounds the flaps, and its lowest part 62x is positioned lower than lower ends of the flaps. Pressing mechanisms 40 are provided at corners of the case body. After contents are filled into the case, a pressing part 42 of the pressing mechanism 40 presses lower parts of the four flaps against side walls 51a, 51b of the case body via the outer part of the bag. While the pressed state is maintained as it is, by moving the pressing mechanism 40 upward via a lifting mechanism, the outside of the bag is brushed up and the lowest part is positioned higher than the lower ends of the flaps.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method and apparatus for raising an outer portion of a bag hung in a case made of cardboard or the like after loading the contents.

In an automatic boxing system, a case such as a corrugated board conveyed from a conveyor is stopped at a boxing stage, and a robot loads contents into the case. The case is covered with a bag in advance, and the contents are double-packaged in the bag and the case.

The bag covers the inside of the case and is folded back at the upper end of the case to cover the outer circumference of the case. After the contents are loaded, the outer portion of the bag is lifted off from the outer periphery of the case, and the bag is closed.

The bag raising is performed manually or by a bag raising device as disclosed in Patent Document 1. In this bag lifting device, the outer portion of the bag is vacuum-sucked by a plurality of suction cups, and the suction cups are raised to raise the outer portion of the bag and remove it from the case.

Japanese Patent No. 4125058

Generally, a case has a case main body and four flaps that cover an upper end opening of the case main body. When the bag is hung on the case, the flap is folded outward and faces the side wall of the case body. The lowermost portion of the outer portion of the bag is located below the lower end of the flap, which restrains the flap and prevents it from spreading away from the side wall.

Since the flap is separated from the side wall of the case body even in the restrained state, when the outer portion of the bag is manually pulled up, the bag is caught at the lower corner of the flap. If a force is further applied in this state in the pulling direction, the bag may have a hole at the lower corner of the flap, or the bag may be torn at the upper corner of the flap.

The bag lifting device of Patent Document 1 is intended for a case without a flap, but when this device is applied to a case with a flap, the flap is not constrained so that the flap spreads in the direction away from the side wall, and therefore the hand Similar to the work of pulling up the bag, there is a possibility that the bag may be caught at the lower corner of the flap and damaged. Further, if the suction force of the suction cup is weak, the suction cup is displaced from the bag and the bag cannot be surely raised, and if the suction force is increased, damage such as wrinkles remains on the bag.

The present invention has been made to solve the above problems, and a bag is hung on a case having a case main body and four flaps that cover the upper end opening of the case main body, and the bag is provided inside the case main body. The inside of the bag and the outside of the case body folded back at the upper end to enclose the flap, and the outermost part of the outer part is lower than the lower end of the flap. In the bag raising method to raise the section,
A step in which a plurality of pressing mechanisms press the lower parts of the four flaps toward the corresponding side walls of the case body via the outer side of the bag; and a plurality of the pressing mechanisms while maintaining the pressed state of the flaps. By moving upward, the outer side of the bag is slid up, and the lowermost part of the outer side of the bag is positioned higher than the lower end of the flap.
According to the above method, the flap is pressed against the side wall of the case body and the outer portion of the bag is raised, so that the corner of the lower end of the side wall is not caught in the bag and damage to the bag can be avoided.

Preferably, the pressing mechanism is arranged at the four corners of the case body, and the two pressing portions of each pressing mechanism connect the lower portions of the two flaps adjacent to each other at the corners of the case body to the outside portion of the bag. Press through.
According to the above method, the lower part of each flap can be efficiently and reliably pressed by pressing it at the two positions at the left and right ends thereof. Further, since the strong corner portion is pressed down, the deformation of the case can be suppressed.

The outer portion of the bag is folded back at the lowermost portion to form a double layer having an inner peripheral portion and an outer peripheral portion, and by moving upward while the pressing portion is in contact with the outer peripheral portion, The outer peripheral part moves upward together with the pressing part while rubbing against the inner peripheral part.
According to the above method, since the frictional resistance between the outer peripheral portion and the inner peripheral portion of the bag is smaller than the frictional resistance between the inner peripheral portion of the bag and the flap, the bag can be raised smoothly.

A pad that is in contact with the outer side of the bag is attached to the pressing portion, and the frictional resistance between the pad and the bag is larger than the frictional resistance between the bag and the flap.
According to the above method, the bag can be raised more reliably by using the pad.

According to another aspect of the present invention, a bag is hung on a case having a case body and four flaps that cover an upper end opening of the case body, and the bag has an inner portion that covers the inside of the case body, and In a bag lifting device that has an outer part that is folded back at the upper end of the case body and surrounds the flap, and in which the lowermost part of the outer part is lower than the lower end of the flap, the outer part of the bag is raised. ,
The case main body includes four pressing mechanisms arranged at the four corners of the case body, and an elevating mechanism that elevates and lowers the four pressing mechanisms. Each of the pressing mechanisms has two holding parts and the two holding parts. Part is in contact with the outer side of the bag, and the lower parts of the two adjacent flaps in the corner of the case body are pressed toward the corresponding side walls of the case body, and the lifting mechanism presses the flap. In this state, by simultaneously moving the four pressing mechanisms upward, the outer portion of the bag is slid upward together with the pressing portion, and the lowermost portion of the outer portion is positioned higher than the lower end of the flap. It is characterized by doing.
According to the above configuration, the flap is pushed against the side wall of the case body to raise the outer portion of the bag, so that the corner of the lower end of the side wall is not caught on the bag, and damage to the bag can be avoided. Further, by pressing the lower part of each flap at two positions, the left and right ends thereof, it is possible to press efficiently and reliably.

In one specific aspect, at least one of the pressing mechanisms includes a pressing member and a drive unit that moves the pressing member, and the pressing member has the two branched pressing units, The two pressing portions have pressing surfaces that are parallel to the two side walls adjacent to each other at the corner of the case body, respectively, and the drive unit is configured so that the pressing member is inclined from the two side walls adjacent to each other. Move it toward the corner of the case body.
According to the above configuration, it is possible to efficiently press two flaps simultaneously with one pressing member.

In another specific aspect, at least one of the pressing mechanisms has two pressing parts and two driving parts that move the pressing parts independently of each other, and the two pressing parts are provided in the case. The corner has a pressing surface that is parallel to two adjacent side walls, and the drive section moves the pressing section toward the side wall from a direction orthogonal to the corresponding side wall.
According to the above configuration, each flap can be reliably pressed by the pressing portion from the front side.

Preferably, a pad that is in contact with an outer portion of the bag is attached to the pressing surface, and a frictional resistance between the pad and the bag is larger than a frictional resistance between the bag and the flap.
According to the above configuration, the bag can be raised more reliably by using the pad.

According to the present invention, the outer portion of the bag hung on the case can be reliably raised without damaging the bag.

It is a top view of the boxing auxiliary system provided with the bag lifting device which concerns on one Embodiment of this invention, and the bag hung on the case is abbreviate|omitted and shown. It is the side view which looked at the boxing assistance system of FIG. 1 from the II direction in FIG. 1, and shows the correction mechanism abbreviate|omitted. It is a top view which shows the 1st corner unit of a packing assistance system. It is the side view which looked at the 1st corner part unit from the B direction in Drawing 3A. It is the rear view which looked at the 1st corner part unit from the C direction in FIG. 3B, and a correction mechanism is abbreviate|omitted and shown. It is a top view which shows the 2nd corner part unit of a packing assistance system. FIG. 4B is a side view of the second corner unit viewed from the direction B in FIG. 4A, and the correction mechanism is omitted. FIG. 4C is a rear view of the second corner unit viewed from the direction C in FIG. 4A, and the correction mechanism is omitted. FIG. 6 is an enlarged plan view of a main part for explaining the operation of the case straightening device in the boxing assistance system, in which the bag is omitted and the case is displaced and deformed in an exaggerated manner. This figure shows a state in which the hooks of the hooks of the case straightening device are arranged inside the corners of the case. FIG. 9 is an enlarged plan view of an essential part showing a state in which the hook has moved the corner of the case to the reference position and the correction of the case has been completed. It is a principal part enlarged plan view which shows the state with which the content was loaded, maintaining the correction state of a case. It is a top view explaining an operation of a bag raising device, and a bag is omitted and a standby state of a bag raising device is shown. It is a side view which shows the standby state of FIG. 6A. It is a top view which shows the state which the 1st step of the flap holding|maintenance process by the two 1st pressing mechanisms of a bag raising apparatus, and the flap holding|maintenance process by two 2nd pressing mechanisms was completed. It is a side view which shows the state of FIG. 7A. It is a top view showing the state where the 2nd step of the flap pressing process by the 2nd press mechanism was completed. It is a side view which shows the state of FIG. 8A. FIG. 9 is a plan view showing a state in which the outer side portion of the bag is slid up by raising these pressing mechanisms in a state where the flaps are pressed by the four pressing mechanisms via the outer side portion of the bag. It is a side view which shows the state of FIG. 9A.

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a cartoning auxiliary system 2 arranged on a cartoning stage of a conveyor 1.
The conveyor 1 conveys a case 50 made of plastic, for example, cardboard with a bag 60 made of high-density polyethylene (HDPE) hung in the previous stage, to the boxing stage. The case 50 is stopped at a predetermined position by a stopper on this packaging stage, and the contents are loaded by a robot.

The case 50 includes a case body 51 having a rectangular parallelepiped shape, and four flaps for closing the upper end opening of the case body 51. The case body 51 has a rectangular bottom wall, two side walls 51a standing up from the long side edges of the bottom wall, and a side wall 51b standing up from the short side edges of the bottom wall. Of the four flaps, the long side flap connected to the side wall 51a is denoted by reference numeral 52a, and the short side flap connected to the side wall 51b is denoted by reference numeral 52b.

As shown in FIG. 2, the bag 60 has an inner portion 61 arranged along the inner surface of the case body 51, and an outer portion 62 that is folded back at the upper end of the case body 51 and surrounds the flaps 52a and 52b. The outer portion 62 is further folded back at the lower end, and has an inner peripheral portion 62a and an outer peripheral portion 62b to form a double layer.
The folded-back portion 62x (lowermost portion) of the outer portion 62 of the bag 60 is located at a position lower than the lower edges of the flaps 52a and 52b.
The flaps 52a and 52b are folded outward when the bag 60 is hung on the case 50 and face the outer surfaces of the side walls 51a and 51b, respectively. The flaps 52a and 52b are constrained by the outer portion 62 of the bag 60 and are prohibited from opening in a direction away from the side walls 51a and 51b, but are separated from the side walls 51a and 51b in this constrained state (see FIG. 2).

As shown in FIG. 1, the boxing assistance system 2 includes a support frame 3 arranged above the conveyor 1 and an elevating mechanism 4 for elevating the support frame 3. The support frame 3 has a rectangular shape larger than the planar shape of the case body 51 of the case 50, and is arranged so as to surround the case body 51 of the cardboard 50 stopped at the packaging stage when viewed from above.

The elevating mechanism 4 includes an elevating frame 4a connected to one long side of the support frame 3 and an air cylinder 4b for elevating the elevating frame 4a.
The elevating frame 4a extends along the conveyor 1, and is vertically movably supported by vertical guides (not shown) via vertical plate portions 4c formed at both ends thereof.

A first corner unit 5 is installed at two corners of the support frame 3, for example, two corners on the lifting mechanism 4 side, and a second corner unit 6 is installed at the other two corners. There is.
Each first corner unit 5 includes a support bracket 10, and a correction mechanism 20 and a first pressing mechanism 30 supported by the support bracket 10.
Each second corner unit 6 has a support bracket 10', and a correction mechanism 20 and a second pressing mechanism 40 supported by the support bracket 10'.

The correction mechanism 20 of the first and second corner units 5 and 6 has the same configuration. The four correction mechanisms 20, the support frame 3, and the elevating mechanism 4 form a case correction device 8 (only denoted by reference numeral in FIG. 1) that operates as described below.
The two first pressing mechanisms 30, the two second pressing mechanisms 40, the support frame 3, and the elevating mechanism 4 constitute a bag lifting device 9 (only denoted by reference numeral in FIG. 1) that operates as described below. There is. The support frame 3 and the elevating mechanism 4 share the case straightening device 8 and the bag lifting device 9.

As shown in FIGS. 3A to 3C, the support bracket 10 of the first corner unit 5 has an upper horizontal plate portion 11 fixed to the upper surface of the corner portion of the support frame 3 and extends downward from the upper horizontal plate portion 11. It has a hanging part 12 and a lower horizontal plate part 13 fixed to the lower end of the hanging part 12.

A correction mechanism 20 is installed on the upper horizontal plate portion 11. The correction mechanism 20 includes an air cylinder 21 (driving unit) whose main body is fixed to the upper surface of the upper horizontal plate 11, and a hook 25 (correction) connected to the tip of a rod 21 a of the air cylinder 21 via a connector 22. Members) and.

The rod 21a of the air cylinder 21 faces the inside of the support frame 3, and its axis extends horizontally and passes through a reference position (described later) of a corner of the corrugated board 50 on the boxing stage when viewed from above, and the case 50 For example, it is tilted at an angle of 45° with respect to the adjacent side walls 51a and 51b.

The hook 25 is made of a rod material having a substantially L-shaped circular cross section, and has a connecting portion 25a coaxial with the rod 21a and a hooking portion 25b that hangs perpendicularly to the connecting portion 25a. The catch 25b is considerably shorter than the height of the case 50, and is, for example, 100 mm or less.

A first pressing mechanism 30 is installed on the lower horizontal plate portion 13. The first pressing mechanism 30 includes a pressing member 31 and a drive unit 35 that drives the pressing member 31. The drive unit 35 has air cylinders 36 and 37.

The main body of the upper air cylinder 36 is fixed to the lower surface of the lower horizontal plate portion 13, and the axis line of the rod 36a is parallel to the rod 21a of the air cylinder 21 of the correction mechanism 20. It passes through the reference position of. One end of a slider 36b is fixed to the tip of the rod 36a. The slider 36b is slidably supported by the main body of the first air cylinder 36.

The main body of the lower air cylinder 37 is fixed to the slider 36b, and the rod 37a of the lower air cylinder 37 is parallel to the rod 36a of the first air cylinder 36 and passes through the reference position at the corner of the case 50. There is. One end of a slider 37b is fixed to the tip of the rod 37a. The slider 37b is slidably supported on the main body of the air cylinder 37.

The holding member 31 has a base portion 32 fixed to the lower surface of the slider 37b, and a pair of holding portions 33, 33 that are bifurcated from one end of the base portion 32 (one end on the support frame 3 side). The pressing surfaces 33a, 33a on the inner side of the pair of pressing portions 33, 33 are orthogonal to each other, and the intersections thereof are located on the axis of the rods 36a, 37a when viewed from above. Pads 34, 34 made of, for example, a urethane sheet are attached to the pressing surfaces 33a, 33a.

As will be described later, the pressing surfaces 33a, 33a are parallel to the side walls 51a, 51b of the case 50 on the packaging stage, respectively. The drive unit 35 is configured to move the pressing member 31 toward the corner of the case main body 51 from a direction inclined by, for example, 45° with respect to the side walls 51a and 51b.

As shown in FIGS. 4A to 4C, the support bracket 10 ′ of the second corner unit 6 has a structure similar to that of the support bracket 10 of the first corner unit 5 and is fixed to the upper surface of the corner of the support frame 3. The upper horizontal plate portion 11', the hanging portion 12' extending downward from the upper horizontal plate portion 11', and the lower horizontal plate portion 13' fixed to the lower end of the hanging portion 12'. ..

The correction mechanism 20 of the second corner unit 6 is installed on the upper horizontal plate portion 11 ′, but since it has the same configuration as the correction mechanism 20 of the first corner unit 5, the same numbers are given to corresponding components. The explanation is omitted.

The second pressing mechanism 40 of the second corner unit 6 has pressing portions 41 and 42, and air cylinders 45 and 46 (driving portion) that individually drive the pressing portions 41 and 42. The details will be described below.
The main body of the air cylinder 45 is fixed to the lower surface of the lower horizontal plate portion 13', and the axis of the rod 45a thereof extends in a direction orthogonal to the side wall 51a of the case main body 51 on the packaging stage. At the tip of the rod 45a, a vertical flat plate-shaped pressing portion 41 is fixed. The pressing surface 41a of the pressing portion 41 is parallel to the side wall 51a of the case body 51, and a pad 43 made of a urethane sheet is attached to the pressing surface 41a.

A second air cylinder 46 is fixed to a surface of the pressing portion 41 opposite to the pressing surface 41a. The rod 46a of the second air cylinder 46 is orthogonal to the side wall 51b of the case body 51 on the packaging stage. A flat plate-shaped pressing portion 42 is fixed to the tip of the rod 46a. The pressing surface 42a of the pressing portion 42 is parallel to the side wall 51b of the case 50, and a pad 44 made of a urethane sheet is attached to the pressing surface 42a.

The operation of the boxing auxiliary system having the above configuration will be described. In the initial state, the support frame 3 is at the uppermost position and waits for the arrival of the case 50 with the bag 60 hung.

When the case 50 is conveyed to the boxing stage by the conveyor 1 and stopped, the air cylinder 4b operates to lower the support frame 3. In this lowered position, the support frame 3 is slightly higher than the upper end of the case 50 as shown in FIG. Further, as shown in phantom lines in FIG. 1 and in a cross section in FIG. 5A, the hooking portions 25b of the hooks 25 of the four correction mechanisms 20 are located inward from the corners of the case 50, and the upper end portion of the case 50 is located. Has been inserted into. The insertion depth of the hook portion 25b is about 10 to 30 mm from the upper end of the case 50.

In the lowered position of the support frame 3, as shown in FIGS. 6A and 6B, the holding portions 33, 33 of the first pressing mechanism 30 and the holding portions 41, 42 of the second pressing mechanism 40 are provided with the flaps 52a, 52b. It is located at a lower height and is separated from the side walls 51a and 51b of the case 50 and the flaps 52a and 52b. The pressing surfaces 33a and 33a of the pressing portions 33 and 33 are parallel to the side walls 51a and 51b of the case body 51, respectively, and the pressing surfaces 41a and 42a of the pressing portions 41 and 42 are parallel to the side walls 51a and 51b, respectively. There is.

Next, the air cylinders 21 of the four correction mechanisms 20 are simultaneously actuated so that the hooks 25 thereof horizontally move radially away from each other, as indicated by the arrow in FIG.
In FIG. 5A, a case 50 in a regular shape and in a regular position is shown by an imaginary line. The position of the corner of the case 50 shown by this imaginary line is the reference position P. On the other hand, when the case 50 is deformed or deviated from the regular position as shown by exaggerated solid lines in FIG. 5A, the corner of the case 50 is out of the reference position P. As the four hooks 25 move radially as described above, the corners of the case 50 shown by solid lines in FIG. 5A are hooked on the hooking portions 25b of the hooks 25, and as shown in FIG. Is moved to. As a result, the position of the case 50 is corrected and the shape of the case 50 is also corrected to the regular shape.

Next, the contents 100 are loaded into the box main body 51 as shown in FIG. 5C while maintaining the corrected state. The content 100 has an elongated shape with a circular cross section, for example, by stacking a large number of paper cups. When the contents 100 are vertically loaded in the case body 51, a small space 101 is formed between the contents 100 and the corner of the case body 51. Since the hook portion 25b of the hook 25 is arranged in the space 101, the hook portion 25b and the contents 100 do not contact each other at the upper end of the case body 51, and the contents 100 are loaded by making maximum use of the accommodation space. be able to.
Although not shown in FIGS. 5A to 5C, the content 100 is loaded into the case body 51 via the inner portion 61 of the bag 60.

After the above-mentioned correction step, before or after loading the contents 100, as shown in FIGS. 7A and 7B, the pressing members 31 are moved by the operation of the air cylinders 36 and 37 of the two first pressing mechanisms 30. The pad 34, 34 moves toward the corner of the bag 51, hits the lower portions of the flaps 52a, 52b through the outer portion 62 of the bag 60, and further presses the lower portions of the flaps 52a, 52b against the side walls 51a, 51b. .. At approximately the same time, the operation of the air cylinders 45 of the two second pressing mechanisms 40 moves the pressing portion 41 toward the side wall 51a, and the pad 43 thereof contacts the lower portion of the flap 52a via the outer side portion 62 of the bag 60. Further, the flap 52a is pressed against the side wall 51a.

Next, as shown in FIG. 8, the pressing portion 42 moves toward the side wall 51 b by the operation of the air cylinders 46 of the two second pressing mechanisms 40, and the pad 44 of the pressing portion 42 passes through the outer side portion 62 of the bag 60. It hits the lower part of the flap 52b and is further pressed against the side wall 51b.
In the pressed state of the flaps 52a and 52b, the pads 34, 43 and 44 are in contact with the outer peripheral portion 62b of the double outer portion 62 of the bag 60.

Next, the operation of the air cylinder 4b of the lifting mechanism 4 raises the support frame 3 to the initial position described above. As the support frame 3 rises, the hook portions 25b of the four hooks 25 come off from the upper ends of the corners of the case 50. As described above, since the hook 25b is arranged in the space 101 between the corner of the case 50 and the content 100, there is no contact with the content 100, and the content 100 is released when the content is released from the case 50. There is no inconvenience of disturbing the loading state of the device or removing the contents together.

As shown in FIG. 9, the two first pressing mechanisms 30 and the two second pressing mechanisms 40 ascend with the flaps 52a and 52b held down as the support frame 3 rises. Between the inner peripheral portion 62a of the bag 60 and the flaps 52a and 52b, and the frictional resistance between the inner peripheral portion 62a and the outer peripheral portion 62b of the bag 60. Since the frictional resistance is greater than the frictional resistance, the outer peripheral portion 62b of the bag 60 ascends together with the pads 34, 43, 44 while rubbing against the inner peripheral portion 62a. Since the outer peripheral portion 62b is slid up in this manner, the folded-back portion 62x, which is the lowermost portion of the bag 60, passes over the lower ends of the flaps 52a and 52b.

Lastly, the pressing portions 33, 33 are retracted from the flaps 52a, 52b by the operation of the air cylinders 36, 37, and the pressing portions 41, 42 are retracted from the flaps 52a, 52b by the operation of the air cylinders 45, 46.

After the loading of the contents 100 on the bagging stage is completed as described above, the case 50 is conveyed by the conveyor 1 to the next box closing stage. At the box closing stage, an operator removes the outer portion 62 of the bag 60 from the case 50 by grasping and pulling up the upper end of the outer peripheral portion 62b of the bag 60. At this time, since the folded-back portion 62x, which is the lowermost portion of the bag 60, is located at a position higher than the lower ends of the flaps 52a and 52b, the outer portion 62 of the bag 60 does not catch on the corners of the lower ends of the flaps 52a and 52b, and It is possible to avoid piercing the outer portion 62 of 60 at the corners of the lower ends of the flaps 52a, 52b. Further, since the bag 60 is not subjected to a large force in a state where the outer side portion 62 of the bag 60 is hooked on the lower corners of the flaps, the bag 60 strongly hits the upper corners of the flaps 52a and 52b and is torn. Can also be avoided.

After the outer portion 62 of the bag 60 is removed from the case 50 and closed as described above, the upper end opening of the case body 51 is closed by the flaps 52a and 52b.

The present invention is not limited to the above embodiment and can employ various aspects.
All of the four pressing mechanisms may be composed of the first pressing mechanism, or all of them may be composed of the second pressing mechanism.
The four pressing mechanisms may be independently lifted and lowered by the four lifting mechanisms.
The outer portion of the bag does not have to be folded back to make it double. In this case, the lower end edge of the outer side portion of the bag becomes the lowermost portion, and the outer side portion moves upward together with the pressing mechanism while rubbing against the flap.
In the above embodiment, the conveyor and the support frame are horizontal, but they may be tilted by, for example, about 30° to facilitate loading of the contents. In this case, all the components of the above-mentioned embodiment are arranged in a tilted manner.

The present invention can be applied to a system for loading contents into a case.

3 Support Frame 4 Lifting Mechanism 9 Bag Lifting Device 30 First Pressing Mechanism (Pressing Mechanism)
31 pressing member 33 pressing part 33a pressing surface 34 pad 35 driving part 40 second pressing mechanism (pressing mechanism)
41, 42 Holding part 41a, 42a Holding surface 43, 44 Pad 45, 46 Air cylinder (driving part)
50 case 51 case main body 51a, 51b side wall 52a, 52b flap 60 bag 61 inner part 62 outer part 62a inner peripheral part 62b outer peripheral part

Claims (8)

A bag is hung on a case having a case main body and four flaps that cover the upper end opening of the case main body, and the bag is folded back at the inner portion that covers the inside of the case main body and the upper end of the case main body. In a bag-raising method of raising the outer part of the bag in a state where the outer part encloses the flap and the lowermost part of the outer part is at a position lower than the lower end of the flap,
A plurality of pressing mechanisms pressing the lower parts of the four flaps toward the corresponding side walls of the case body via the outer side of the bag;
By moving the plurality of pressing mechanisms upward while maintaining the pressed state of the flap, the outer portion of the bag is slid up, and the lowermost portion of the outer portion of the bag is positioned higher than the lower end of the flap. And the process of
A method of raising a bag, characterized by comprising: The pressing mechanism is arranged at four corners of the case main body, and two pressing parts of each pressing mechanism are provided at the bottoms of two flaps adjacent to each other at the corners of the case main body via the outer part of the bag. The bag raising method according to claim 1, further comprising pressing. The outer portion of the bag is folded back at the lowermost portion to form a double layer having an inner peripheral portion and an outer peripheral portion, and by moving upward while the pressing portion is in contact with the outer peripheral portion, The bag raising method according to claim 2, wherein the outer peripheral portion moves upward together with the pressing portion while rubbing the inner peripheral portion. A pad that is in contact with an outer portion of the bag is attached to the pressing portion, and a frictional resistance between the pad and the bag is larger than a frictional resistance between the bag and the flap. The method of raising a bag according to 2 or 3. A bag is hung on a case having a case main body and four flaps that cover the upper end opening of the case main body, and the bag is folded back at the inner portion that covers the inside of the case main body and the upper end of the case main body. In a bag raising device that has an outer part that surrounds the flap, and a lowermost part of the outer part is at a position lower than the lower end of the flap, and that raises the outer part of the bag.
Four pressing mechanisms arranged at the four corners of the case body, and an elevating mechanism for elevating the four pressing mechanisms,
Each of the pressing mechanisms has two pressing parts, the two pressing parts are in contact with the outer part of the bag, and the lower parts of two flaps adjacent to each other in the corner of the case body are connected to the case. Press it against the corresponding side wall of the main body,
The elevating mechanism slides the outer portion of the bag upward together with the pressing portion by simultaneously moving the four pressing mechanisms upward while the flaps are pressed, so that the lowermost portion of the outer portion is lifted. Is a position higher than the lower end of the flap. At least one of the pressing mechanisms has a pressing member and a drive unit that moves the pressing member,
The pressing member has the two branched pressing portions, and the two pressing portions have pressing surfaces that are parallel to two adjacent side walls at a corner of the case body, respectively.
The bag lifting device according to claim 5, wherein the drive unit moves the pressing member toward a corner of the case body from a direction inclining to two adjacent side walls. At least one of the pressing mechanisms has two pressing parts and two driving parts for independently moving these pressing parts,
The two pressing portions have pressing surfaces that are parallel to the two adjacent side walls at the corner of the case,
The bag lifting device according to claim 5, wherein the driving unit moves the pressing unit toward the side wall from a direction orthogonal to the corresponding side wall. A pad that is in contact with the outer side of the bag is attached to the pressing surface, and the frictional resistance between the pad and the bag is larger than the frictional resistance between the bag and the flap. The bag lifting device according to 6 or 7.

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