JPH09249201A - Carton cover closing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide carton cover closing equipment which makes it possible to shorten a carton carrier line, to easily prepare for a carton change if there is one and has higher generality corresponding to various cartons as well. SOLUTION: A cover flap 73a, while it is bent to a certain extent by tilting forward a flap bending member 11, is adsorbed and held by an adsorption head 41. The tuck 77 is bent roughly 90 deg. by turning a tuck bending member 51, and from this condition, one end part of the flap bending member 11 is lowered by one of the cylinders 30 to insert one end part of the tuck 77 into the body part 71 of the carton 70. Then by the other cylinder 30, the other end part of the flap bending member 11 is lowered to insert the other end part of the tuck 77 into the body part 71 of the carton 70. Then by turning the tuck bending member 51, the tuck bending member 51 is separated from the tuck 77. In this condition, the flap bending member 11 is further tilted forward and the whole tuck 77 is inserted into the body part 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carton lid closing device for closing a carton lid by closing a lid flap of the carton after filling an article into an assembled carton in a packaging operation step.

[0002]

2. Description of the Related Art As a packaging material for articles, there is a carton formed of cardboard or the like. In this type of carton, as shown in FIG. A lid flap f, a side flap s, and a bottom flap g, which are respectively closed, are continuously provided, and a tack t to be inserted into the body portion b is continuously provided at a leading edge of the lid flap f. Therefore, when an article is packaged using this kind of carton, after the article is filled in the body portion b whose bottom is formed by the bottom flap g, the side flaps s
By closing the lid flap f with the lid closing device and inserting the tuck t into the body part b.
The lid is closed.

As a carton lid closing device for closing the lid of this type of carton, the lid flaps f and the tuck t are cartoned along a conveyor for conveying the cartons filled with the articles from the article filling station. Torso b
There is one in which a long guide plate for guiding to the side is provided, and the lid flap f is gradually bent by the guide plate and the tack t is bent while the carton is conveyed by the conveyor. , The tuck is guided by the guide plate and gradually inserted into the body b from one end of the tuck, and finally the tuck t is completely inserted into the body b.

[0004]

By the way, the above-mentioned device for closing the lid of the carton is constituted by a long guide plate provided along the conveyer for carrying, and the lid is closed while the carton is being fed. Therefore, there is a problem in that the carton transfer line is unnecessarily long due to the carton lid closing device, and the space occupied by the entire article packaging device becomes large.

Further, since it is necessary to replace the above-mentioned long guide plate each time the type and size of the carton for filling the article changes, it is necessary to prepare a plurality of guide plates corresponding to the carton. However, there is a problem that it takes time to change the setup and adjust the position.

Therefore, an object of the present invention is to make it possible to shorten the carton transportation line and, moreover, to easily carry out the setup change even if the carton is changed.
An object of the present invention is to provide a highly versatile carton lid closing device that can be applied to various cartons.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a lid flap is connected to an edge of a rectangular tubular body on the side of an article filling port through a fold line. A carton in which a tack is continuously provided on the tip edge of the lid flap through a fold line, the lid flap is bent at the fold line to close the article filling port of the body, and the tuck is bent at the fold line. A lid closing device for a carton that closes the lid by inserting the lid into the body, and supports the carton at a rear position of the carton positioned at the lid closing position so as to come into contact with a lid flap of the carton and can be tilted forward. The flap bending member, a suction head attached to the flap bending member, which sucks the outer surface of the lid flap to support the lid flap, and abuts on the base end portion of the tuck. The tack bending member rotatably supported at the tip of the flap bending member, and the lid flap that tilts the flap bending member forward and abuts against the flap bending member are provided at the article filling port side of the body. Flap folding member drive means for bending the tack flap, the tack folding member drive means for rotating the tack folding member to bend the tack, and the lid flap to a certain extent by tilting the flap folding member forward. The lid flap is sucked by the suction head to be sucked and held by the flap bending member, and the tack bending member is rotated, whereby the tuck is bent approximately 90 degrees with respect to the lid flap, After tilting the flap bending member forward and slightly inserting the tip end portion of the tack into the body portion, the tack bending member is rotated to rotate the tack folding member. By operating the flap folding member driving means in a state where the member is separated from the tack, the flap folding member is further tilted forward so that the entire tack is inserted into the trunk portion. A lid closing device for a carton provided with a bending member driving means and a control means for controlling the tuck bending member driving means.

Further, a pair of elevating means for elevating and lowering both ends of the flap bending member are further provided, and
In place of the control means, the flap folding member is bent forward to bend the lid flap to some extent, and the lid flap is sucked by the suction head and sucked and held by the flap folding member, and the tack bending is performed. By rotating the member, the tack is bent approximately 90 degrees with respect to the lid flap, and one of the elevating means is operated to lower one end of the flap bending member by a predetermined amount. After inserting one end of the tuck into the body of the carton, the other lifting means is operated to lower the other end of the flap bending member to the height position of the one end of the flap bending member. , The other end of the tuck is inserted into the body of the carton by making the flap bending member flat, and the tuck bending member By operating the flap bending member driving means in a state in which the tack bending member is separated from the tack by rotating the flap bending member, the flap bending member is further tilted forward, and the entire tack is formed into the body portion. When the control means for controlling the flap bending member driving means, the tack bending member driving means and the elevating means is provided so that the tuck can be smoothly inserted into the carton body.

[0009]

Embodiments will be described below with reference to the drawings. FIG. 1 shows a lid closing station for a carton that closes a lid of a carton 70 filled with articles in a step of packing articles. A carton filled with articles is conveyed to the lid closing station by a chain conveyor 2 by an article filling device (not shown), and the lid of the carton 70 stopped at a predetermined lid closing position is closed. It is closed by the closing device 1.

As shown in FIGS. 11 and 12, the carton 70 used in this packaging operation step has two end plates 71 facing each other and two side plates 71a and 71b facing each other.
c and 71d are connected to each other via a fold line 72, and a rectangular tubular body portion 71, and a fold line 74 at the upper end edge of the body portion 71.
Lid flaps 73a and side flaps 73b and 73c that are continuously provided via a tuck 77 that is continuously provided at the leading edge of the lid flap 73a through a fold line 78, and a body portion 71.
It is composed of four bottom flaps 75a, 75b, 75c, 75d that are connected to the lower end edge of the body via a fold line 76. When the body 71 is raised in a rectangular tube shape, the bottom flap 75
It is a so-called one-touch carton in which the bottom is naturally formed by a, 75b, 75c, and 75d. After the body 71 is filled with the article, the side flaps 73b and 73c are folded at the fold line 74, and the lid flap 73a is folded at the fold line 74 to close the article filling port of the body 71. Further, when the tack 77 is bent along the fold line 78 and inserted into the body 71, the lid closing of the carton 70 is completed.

As shown in FIG. 1, the chain conveyer 2 has a body 71 with a connecting rod 2c for connecting the chains 2b, which are placed on both sides of the placing plate 2a of the carton 70, respectively. While pushing the end plate 71c, the carton 70 is conveyed to the lid closing station, and the carton 70 reaching the lid closing station is guided by the guides 2d that abut against the side plates 71a and 71b of the body 71. The conveyor 2 is positioned in the width direction, and the chain conveyor 2 is positioned in the transfer direction by the positioning arm 2e that projects to the transfer path and contacts the end plate 71d located on the front side in the transfer direction.

Further, as shown in FIG. 5, a side flap folding means 3 for folding the side flaps 73b and 73c of the carton 70 is provided in front of the lid closed position, and the side flap folding means 3 is provided. Reference numeral 3 denotes a guide 3a formed by a flat bar arranged from the front side of the lid closing position to the lid closing position so as to be in contact with the upper edge of the body 71 of the carton 70 to be conveyed, and the guide 3a.
And a bending piece 3b that is rotatably supported in front of.

The guide 3a rises slightly upward while the front end of the lid closed position is curved, and the side flap 73c on the front side in the transport direction of the transported carton 70 is guided to the curved portion. It is designed so that it can be bent naturally. On the other hand, the side flap 73b on the rear side in the transport direction of the carton 70 has the folding piece 3b.
When it comes to the position, it is bent by being bent into the front side by the bending piece 3b which is rotationally driven by the driving means (not shown). Side flaps 7
The carton 70 in which 3b and 73c are folded is conveyed to the lid closed position while the bent state is held by the guide 3a, and in the lid closed position, the lid flap 73a and the lid flap 73a are formed by the lid closing device 1 described in detail below. The lid is closed by the tack 77.

As shown in FIGS. 1 to 4, the lid closing device 1 is provided continuously with a flap folding means 10 for folding the lid flap 73a of the carton 70 forward and a tip of the lid flap 73a. It is composed of a tack bending means 50 for bending the tack 77, and the flap folding means 10 and the tack bending means 50 cooperate to ensure that the lid of the carton 70 can be closed.

The flap folding means 10 is provided at the rear position of the carton 70 positioned at the lid closing position,
A plate-shaped flap bending member 11 having a predetermined width, which is supported so as to tilt forward, and a flap bending member drive for tilting the flap bending member 11 forward so as to come into contact with the tip end portion of the lid flap 73a of the carton 70. A cylinder 20 as a means,
With the flap bending member 11 tilted forward by the flap bending member driving means, the flap bending member 11
And a suction means 40 for suction-holding the lid flap 73a on the contact surface of the flap bending member 11.

As shown in FIGS. 1 and 3, both ends of the flap bending member 11 are engaged with slide rails 12a formed at the upper ends of a pair of left and right guide frames 12 facing each other, and the slide rails 12a are formed. The slider 12b that slides upward is connected to each other via connecting members 13a and 13b. The pair of guide frames 12 are connected to each other by a connecting plate 14 at a front end and a shaft 15 at a rear end. There is. Further, at the rear end portions of the pair of guide frames 12, support members 16 rising diagonally upward toward the front are provided at corresponding positions, and the support member 16 supports the connecting shaft 17. .

Further, as shown in FIGS. 3 and 4, the guide frame 1 is attached to the support member 12c attached to the rear end of the one guide frame 12 and the connecting plate 14.
A ball screw 18 is rotatably supported in parallel with 2, and one connecting member 13b is screwed into the ball screw 18. A timing pulley 18a is attached to the front end of the ball screw 18, and the timing pulley 18a and the timing pulley 19a attached to the rotary shaft of the stepping motor 19 fixed to the connecting plate 14 are attached to the timing belt. 19b is hanging. Therefore, when the stepping motor 19 is operated, the rotational driving force is changed to the timing belt 19b.
It is transmitted to the ball screw 18 through the ball screw 18, and the ball screw 18 rotates at a fixed position, so that the flap bending member 11 can move in the front-rear direction along the guide frame 12 to adjust its position.

As shown in FIGS. 1 and 3, a frame 23 extending along the chain conveyor 2 is fixedly installed at a rear position of the chain conveyor 2, and the frame 23 is horizontally arranged on the rear side thereof. The unit base 24 protruding to the front and the pair of left and right cylinder bases 33 protruding to the front side are fixed to each other.

A pair of opposed support plates 25 standing upright on the unit base 24 are attached to the unit base 24, and a support shaft 26 horizontally supported by the support plates 25 serves as a fulcrum for a certain range. The cylinder 20 is attached so that the cylinder can be tilted. The tip of the piston rod 21 of the cylinder 20 is connected to the central portion of the connecting shaft 17 via a ball joint 22, and the connecting shaft 17 is free to the piston rod 21 to some extent with the connecting portion serving as a fulcrum. To be able to move to.

Two cylinders 30 are attached to the cylinder base 33 in a slightly tilted state so that the piston rods 31 of the cylinders 30 protrude upward. The shaft 15 is rotatably supported at the tip end thereof through a substantially L-shaped pinch lever 32.

Therefore, as shown in FIG. 1, the guide frame 12 is supported by the piston rod 31 of the cylinder 30 so as to be able to tilt forward, with the shaft 15 at the rear end of the guide frame 12 as a rotation axis. The piston rod 21 of the cylinder 20 connected to the connecting shaft 17 maintains a predetermined posture (initial state in which the front end of the guide frame 12 is lifted). In this state, the flap folding member 11 is moved by the stepping motor 19 (see FIG. 4) so that the flap folding member 11 faces the tip portion of the lid flap 73a of the carton 70 held in the lid closed position. Is being adjusted.

As shown in FIG. 2, the piston rod 21 of the cylinder 20 projects forward, whereby the guide frame 12 tilts forward. At this time, since the flap bending member 11 is also tilted forward together with the guide frame 12, the flap bending member 11 comes into contact with the tip end portion of the lid flap 73a of the carton 70, and the lid flap 73a.
Is bent toward the article filling port side of the body 71.

In the initial state shown in FIG. 1, the cylinder 30 is in a state in which the respective piston rods 31 are projected. From this state, one cylinder 30 is operated to lower the piston rod 31. When,
Shaft 15 and guide frame 1 on this shaft 15
One end side of the flap bending member 11 connected via 2 is inclined downward. At this time, the connecting shaft 17 connected to the guide frame 12 also inclines similarly, but the connecting shaft 17 is connected to the piston rod 21 of the cylinder 20 via the ball joint 22 as described above. Moreover, since the cylinder 20 itself is tiltably supported by the support plate 25, the piston rod 21 itself slightly tilts forward and the ball joint 22 portion can absorb the tilt of the connecting shaft 17, so that the piston rod 21 can be absorbed. Unreasonable force is not applied to. The same applies when the other cylinder 30 is operated, and by operating each cylinder 30, the flap bending member 11 can be freely tilted left and right within a certain range.

The suction means 40 is attached to the flap bending member 11 as shown in FIGS. 1 and 3.
The individual suction heads 41 are connected to a suction device such as a compressor (not shown) via a suction hose 42, and the carton 70 that abuts on the flap bending member 11.
The lid flap 73a is sucked and held by the suction head 41 so as to be adsorbed and held on the contact surface of the flap bending member 11.

As shown in FIGS. 1 to 3, the tack bending means 50 includes a tack bending member 51 rotatably attached to the tip of the flap bending member 11, and the tack bending member 51. And a tack bending member driving means 60 for rotating the tack bending member 5
When 1 rotates, it comes into contact with the base end portion of the tack 77 of the carton 70 and bends the tack 77.

The tack bending member 51 has a bar shape having the same length as that of the flap bending member 11, and the contact surface side of the tack 77 is thinned toward the tip at the tip portion thereof. A tapered portion 52 is formed. A connecting shaft 53 is rotatably supported at the tip of the flap bending member 11 via a metal fitting, and a tack bending member 51 is fixed to the connecting shaft 53 via a metal fitting. Therefore, when the connecting shaft 53 is rotated, the tack bending member 51 is rotated.

The tack bending member driving means 60 includes a stepping motor 62 attached to a motor base 61 fixed to the flap bending member 11, and a timing pulley 63 attached to a rotating shaft of the stepping motor 62. , A timing pulley 64 attached to the connecting shaft 53 and a timing belt 65 attached to both timing pulleys 63, 64, so that the connecting shaft 53 can be rotated by the stepping motor 62. Has become.

Further, a disc 66 having markings on its entire circumference at regular intervals is attached to the rotary shaft of the stepping motor 62, and the marking of the disc 66 can be detected by a sensor 67 attached to the motor base 61. Then, the rotation angle of the connecting shaft 53, that is, the rotation angle of the tack bending member 51 is recognized, and the control means (not shown) controls the stepping motor 62 based on this detection signal.

The drive control of the cylinders 20 and 30, the stepping motor 62, etc. is performed by the control means (not shown) as follows.

The lid closing operation of the carton 70 by the lid closing device 1 configured as described above will be described with reference to FIGS. 6 to 10. As shown in FIG. 6A, the carton 70 transported to the lid closed position with the side flaps 73b and 73c folded as described above is
The lid flap 73a and the tack 77 are in a state of standing up from the body portion 71, and the lid closing device 1 is on standby with the flap bending member 11 facing the tip of the lid flap 73a. Then, when the cylinder 20 is actuated and the piston rod 21 thereof begins to project, the flap bending member 11 gradually leans forward while gradually bending the lid flap 73a, and as shown in FIG. The lid flap 73a is bent to a position where the article filling port of the body portion 71 is completely closed by the piece 73a.

Next, in this state, the suction head 41 sucks the lid flap 73a, sucks and holds the lid flap 73a on the contact surface of the flap bending member 11, and then the stepping motor 62 is actuated. As shown in Figure (c),
The tack bending member 51 is rotated until the tack 77 is bent about 90 degrees with respect to the lid flap 73a. Then, the cylinder 20 is reversely operated while keeping the tack 77 bent at about 90 degrees, and the tip of the lid flap 73a is moved to a position where the tip of the tack 77 is slightly higher than the upper edge of the body 71. Is lifted (see FIG. 8D and FIG. 8).

Next, in this state, one cylinder 30 is operated to lower the piston rod 31, and as shown in FIGS. 7A and 9, the guide frame 12,
Since one end sides of the flap bending member 11 and the tack bending member 51 are lowered downward and tilted together with the shaft 15 and the connecting shaft 17, one end side of the tack 77 is slightly inserted into the body portion 71.

Next, from this state, when the other cylinder 30 is further operated to lower the piston rod 31, the guide frame whose one end side is inclined downward as shown in FIGS. 7B and 10. 12, the other end of the shaft 15, the connecting shaft 17, the flap bending member 11 and the tack bending member 51 descends downward to become flat, so that the other end of the tack 77 is inserted into the body 71. The entire tack 77 is slightly inserted into the body 71.

The tack bending member 51 is only in contact with the base end portion of the tack 77, and at the tip end portion of the tack bending member 51, the contact surface side becomes thinner toward the tip end. Since the tapered portion 52 is formed,
During the inserting operation of the tack 77 as described above, the tack bending member 51 itself does not damage the upper edge of the body portion 71, and the tack 77 can be smoothly inserted into the body portion 71.

Then, from this state, as shown in FIG. 7C, the tack bending member 51 is completely separated from the tack 77 by operating the stepping motor 62 in the reverse direction, and then, as shown in FIG. 7D. As shown in FIG. 6, when the lid flap 73a is bent to the position where the lid flap 73a completely closes the article filling port of the body portion 71 by operating the cylinder 20, the tack 77 is completely inserted into the body portion 71. Then, the lid closing of the carton 70 is completed.

As described above, the lid closing device 1 can securely close the carton 70 positioned at the lid closing position with the side flaps 73b and 73c folded at that position. Because it did, lid flap 7
It is not necessary to provide a long guide that bends the 3a and the tack 77 and inserts them into the body 71 along the chain conveyor 2 for carrying the carton 70, and the carrying line for the carton 70 does not become longer than necessary. The occupied space of the entire packaging device can be reduced.

The lid closing device 1 can adjust the position of the flap bending member 11 within a certain range by sliding the flap bending member 11 along the guide plate 12 by the stepping motor 19. Since such a configuration is adopted, even if the shape and size of the carton are changed to some extent, it can be sufficiently coped with, the setup change can be easily performed, and the versatility of the lid closing device 1 itself is enhanced.

In this embodiment, the cylinder 30 is provided as an elevating means for elevating and lowering both ends of the flap bending member 11, but the carton itself to be used is solid, and its lid flap and tuck are used. If the members such as the above are hard to bend, it is possible to sufficiently cope with them without providing the cylinder 30. In that case,
By operating the cylinder 20 immediately from the state shown in FIG. 6D, the lid flap bending member 73a is moved to the position shown in FIG.
The flap bending member 11 may be tilted forward so that it is bent to the state shown in (d).

Further, in this embodiment, the lid closing of the one-touch carton as described above has been described, but the present invention is not limited to such a one-touch carton, and the article filling port of the body is closed by bending the lid flap. It can be applied to all cartons as long as the lid is closed by inserting the tack into the body.

[0040]

As described above, according to the lid closing device for a carton of the present invention, the lid flap is bent by the flap bending member and the tack is bent by the tack bending member while the carton is positioned at the predetermined lid closing position. Bending, and the flap folding member folds the lid flap where the tack is folded, and inserts the tack into the carton body. It is not necessary to make it longer than that, and the space occupied by the entire article packaging apparatus can be reduced.

Particularly, in the case where the elevating means for elevating and lowering both ends of the flap bending member are provided, one end of the tuck is moved to the body by lowering one end of the flap bending member by the elevating and lowering means. Since the other end of the tuck is inserted into the body by dropping the other end of the flap bending member after inserting the tuck into the body, the tuck can be inserted into the body more smoothly.

Further, since the control means can freely control the operation and position of the flap bending member driving means, the tack bending member driving means and the elevating means, even if the kind or size of the carton is changed to some extent. It is possible to deal with the situation sufficiently, the setup can be easily changed, and the versatility of the apparatus itself is enhanced.

[Brief description of drawings]

FIG. 1 is a side view showing a lid closing device according to an embodiment of the present invention.

FIG. 2 is a side view showing an operating state of the above.

FIG. 3 is a plan view of the above.

FIG. 4 is a partial side view of the above.

FIG. 5 is a perspective view showing a step of bending the above side flap.

FIG. 6 is an operation explanatory view of the lid closing device of the above.

FIG. 7 is an operation explanatory view of the lid closing device of the above.

FIG. 8 is an operation explanatory view of the lid closing device of the above.

FIG. 9 is an operation explanatory view of the lid closing device of the above.

FIG. 10 is an operation explanatory view of the lid closing device of the above.

FIG. 11 is a perspective view showing a carton.

FIG. 12 is a bottom view of the above.

FIG. 13 is a perspective view showing a carton.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid closing device 2 Chain conveyor 10 Flap bending means 11 Flap bending member 20 Cylinder 30 Cylinder 40 Adsorption means 50 Tuck bending means 51 Tack bending member 60 Tuck bending member driving means

Claims (2)

[Claims] 1. An edge of the rectangular tubular body on the side of the article filling port,
A carton in which a lid flap is continuously provided through a fold line and a tuck is continuously provided at a leading edge of the lid flap through the fold line, and the lid flap is bent at the fold line to fill the trunk with articles. A lid closing device for a carton that closes the mouth and closes the lid by bending the tuck along the fold line and inserting the tack into the body part, wherein the carton is located at the rear position of the carton positioned at the lid closing position. A flap bending member that is supported so as to tilt forward so as to contact the lid flap, and a suction head that is attached to the flap bending member and that attracts to the outer surface of the lid flap to support the lid flap. A tack bending member rotatably supported by the tip of the flap bending member so as to come into contact with the base end portion of the tack, and the flap bending member is tilted forward. Flap folding member driving means for folding the lid flap abutting the flap folding member toward the article filling port side of the body portion, and tack folding member driving means for rotating the tack folding member to bend the tack. Bending the lid flap to some extent by tilting the flap folding member forward, sucking the lid flap with the suction head, adsorbing and holding the lid folding member, and rotating the tack folding member. After the tuck is bent about 90 degrees with respect to the lid flap, the flap bending member is tilted forward to slightly insert the tip end of the tuck into the body, and then the tuck bending member. By rotating the flap bending member drive means in a state where the tack bending member is separated from the tack, A carton lid closing device including a flap bending member driving means and a control means for controlling the tuck bending member driving means so as to further tilt the wrap bending member forward and insert the entire tack into the body portion. . 2. The edge of the rectangular tubular body on the side of the article filling port,
A carton in which a lid flap is continuously provided through a fold line and a tuck is continuously provided at a leading edge of the lid flap through the fold line, and the lid flap is bent at the fold line to fill the trunk with articles. A lid closing device for a carton that closes the mouth and closes the lid by bending the tuck along the fold line and inserting the tack into the body part, wherein the carton is located at the rear position of the carton positioned at the lid closing position. A flap bending member that is supported so as to tilt forward so as to contact the lid flap, and a suction head that is attached to the flap bending member and that attracts to the outer surface of the lid flap to support the lid flap. A tack bending member rotatably supported by the tip of the flap bending member so as to come into contact with the base end portion of the tack, and the flap bending member is tilted forward. Flap folding member driving means for folding the lid flap abutting the flap folding member toward the article filling port side of the body portion, and tack folding member driving means for rotating the tack folding member to bend the tack. A pair of raising and lowering means for respectively raising and lowering both ends of the flap bending member, and bending the lid flap to some extent by tilting the flap bending member forward, and sucking the lid flap by the suction head. The tack bending member is sucked and held by the bending member, and the tack bending member is rotated, so that the lifting and lowering means is actuated to actuate one of the lifting and lowering means from a state in which the tack is bent by about 90 degrees with respect to the lid flap. Insert one end of the tack into the body of the carton by lowering one end of the member by a predetermined amount, and then raise the other The other end of the tack by lowering the other end of the flap bending member to a height position of one end of the flap bending member by operating the means to make the flap bending member flat. The flap folding member driving means in a state in which the tack folding member is rotated away from the tack by rotating the tack bending member by inserting the portion into the body of the carton. A carton lid provided with a control means for controlling the flap folding member driving means, the tack folding member driving means and the elevating means so that the folding member is further tilted forward and the entire tack is inserted into the body portion. Closing device.