JP2001278205A - Flap folding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a flap folding plate 56 to support boxes 1 of various sizes without adjusting a fulcrum position or the like of the plate 56. SOLUTION: A pair of L-shaped plates 14, 16 are supported by frames 10, 11 on both sides via a first rod 12. The L-shaped plates have an upper end coupled to a cylinder 18 and rotate with the first rod as the center. A second rod 24 is provided adjacent to the first rod, wherein gears 26, 28 fixed to the second rod engage with gears 20, 22 fitted over the first rod so that when the cylinder 18 activates, the second rod rotates. The rotation of the second rod is transmitted to third and fourth rods 32 via a pulley. A gear 46 of the fourth rod engages with a gear 50 of a fifth rod 48 to which the flap folding plate 56 is attached. When activation of the cylinder 18 causes the L-shaped plates to swing, the fifth rod revolves to cause the flap folding plate to rotate, and also the fifth rod rotates with the first rod as the center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flap bending apparatus for bending a main flap (lid) provided on one wall surface of a box.

[0002]

2. Description of the Related Art Side flaps are provided at the upper portions of both side walls, a main flap (lid) is provided at one of the front and rear walls to close an upper opening, and is connected to an end of the main flap. With an insertion flap provided, and after storing the goods inside from the upper opening,
Conventionally, a box body in which an opening is closed by folding the main flap is widely used.

[0003] In such a box, after an article is inserted into the inside from the upper opening, first, the side flaps on both sides are bent inward, and then the main flap is folded on the side flaps. The insertion flap continuously provided at the tip of the main flap is further bent with respect to the main flap, and the opening is closed by inserting the insertion flap into the wall opposite to the wall on which the main flap is provided. It is supposed to.

A device for folding a flap of a box body as described above has been conventionally known. In particular, as a mechanism for bending a main flap serving as a lid after the box body is sealed, a mechanism for folding a main flap around a fulcrum at a fixed position has conventionally been used. The one provided with a flap folding plate that makes a rotational movement is widely known (see FIG. 2 of JP-A-8-310503).

[0005]

In the conventional flap folding device described in the above publication, when flap folding of boxes of different sizes is performed, the rotation of the flap folding plate is performed according to the size of the boxes. There was a problem that the position of the center fulcrum had to be changed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a flap bending apparatus which can be used for boxes of various sizes without changing or adjusting the position. It is the purpose.

[0007]

SUMMARY OF THE INVENTION A flap folding apparatus according to the present invention presses a main flap for closing an opening at an upper portion of a box by a rotating pressing member and bends the main flap. Moving means for moving the fulcrum position, which is the center of rotation, from behind the main flap in a direction in which the flap can be bent.

In the flap bending apparatus according to a second aspect of the present invention, the rotating means for rotating the pressing member and the moving means for moving the fulcrum position are interlocked and operated by the same drive source. is there.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a side view of a flap folding device according to an embodiment of the present invention, and FIG. 2 is a developed view showing a configuration of a driving unit that rotationally moves a pressing member (flap folding plate). This flap bending device
The flap provided on the box 1 having the shape shown in FIG. 3A is folded. The box 1 includes a front wall surface 1b, a rear wall surface 1c, and side walls 1d, 1e standing upright on a bottom surface 1a.
e, side flaps 1f, 1g provided continuously on the upper portions of both side walls 1d, 1e, respectively, and a main member integrally provided on the upper end of the rear wall surface 1c to close the upper opening 1h of the box body 1. A flap (lid) 1i, and an insertion flap 1j provided at the tip of the main flap 1i via a fold line 1k and inserted into the inside of the front wall surface 1b when the box 1 is sealed.

The box 1 having the above-mentioned shape (see FIG. 3A)
It is intermittently conveyed by the box conveying conveyor 2, and an article is inserted into the inside of the flap folding device at the upstream side, and then, between the insertion flap 1j and the main flap 1i by the insertion flap temporary folding device (not shown). (See FIG. 3 (b)), and then the side flaps 1f, 1g on both sides are folded over the opening 1h by a side flap folding device (not shown). After that (see FIG. 3 (c)), it is supplied to this flap bending device. And in this flap bending device, the main flap (lid) 1i is opened 1h.
The box body 1 containing the articles is sealed by being bent upward (see FIG. 3 (d)) and inserting the insertion flap 1j provided continuously at the tip thereof into the front wall surface 1b. (See FIG. 3E).

Next, the structure of a mechanism for pressing and bending the main flap 1i will be described with reference to FIGS. A support 4 installed on the side of the conveyor 2
Above, a main body 6 of the flap bending device is supported by two guide rods 8, 9 (see FIG. 5 described later) so as to be able to move up and down. Frames 1 on both sides of this body 6
Between 0 and 11, a horizontal first rod 12 is rotatably supported. The first rod 12 is located substantially above the center of the transfer surface of the transfer conveyor 2.

Upper portions of L-shaped plates 14 and 16 are fixed to both ends of the first rod 12, respectively.
One of the pair of L-shaped plates 14, 16 (the right side in FIG. 2) has a portion extending above the first rod 12 horizontally above the main body 6 and the first rod 12. 1 is connected to a piston rod 18a of a cylinder (cylinder for rotating a flap folding plate) 18 fixed in a direction perpendicular to the direction of FIG. Swings between the position indicated by the dotted line and the position indicated by the two-dot chain line.

Large diameter first gears 20 and 22 are rotatably fitted adjacent to the inside of L-shaped plates 14 and 16 fixed to both ends of the first rod 12, respectively. . Also, adjacent to the first rod 12,
A second rod 24 parallel to the rod 12 is rotatably supported between the two L-shaped plates 14 and 16. This second
The small-diameter second gears 26 and 28 are fixed to the rod 24 at positions corresponding to the large-diameter first gears 20 and 22 provided on the first rod 12, and the large-diameter first gears 20 and 22 are fixed.
And are engaged.

A third rod 30 is mounted near the corners 14a, 16a of the L-shaped plates 14, 16 at substantially the middle. Further, one of the L-shaped plates 14 and 16 (on the right side in FIG. 2) has a vertical portion 16c substantially orthogonal to the horizontal portion 16b on which the first rod 12 and the second rod 24 are supported. A short fourth rod 32 penetrates and is rotatably supported near the tip (downward in FIG. 1).

Pulleys 34 and 36 are fitted on the outside of one of the L-shaped plates (the L-shaped plate 16 on the right side in FIG. 2) of the second rod 24 and the short fourth rod 32, respectively. Fixed by each rod 24,
32 to rotate integrally. Also, the third
A pulley 38 is rotatably supported at a position of the rod 30 corresponding to the position of each of the pulleys 34 and 36. The pulley 34 of the second rod 24, the pulley 38 of the third rod 30, and the pulley 3 of the fourth rod 32
6, an endless belt 40 is wrapped around the second belt.
When the rod 24 rotates, the belt 40 travels along with the rotation of the pulley 34, so that the fourth rod 32
Rotate in the same direction as the second rod 24.

A mounting shaft 4 is provided between the third rod 30 and the short fourth rod 32 of the one L-shaped plate 16.
2, an idle pulley 44 is attached. The mounting shaft 42 of the idle pulley 44 is adapted to be fitted into a long hole 16d formed in the L-shaped plate 16 so that the mounting position can be moved. The tension of the belt 40 can be adjusted.

A third gear 46 is fixed to the short fourth rod 32 on the inner side of the L-shaped plate 16.
Further, the vertical portions 14 of the two L-shaped plates 14, 16
The tip of c, 16c (the lower end in FIGS. 1 and 2)
Is rotatably supported. A fourth gear 50 is fixed at a position of the fifth rod 48 corresponding to the gear 46 of the short fourth rod 32 and meshes with the gear 46 of the fourth rod 32. Therefore, when the short fourth rod 32 rotates via the endless belt 40, the gear 46 of the fourth rod 32 meshing with each other is rotated.
The rotation is transmitted through the gear 50 of the fifth rod 48 and the fifth rod 48, and the fifth rod 48 rotates in the opposite direction to the rotation of the second, third, and fourth rods 24, 30, 32.

The fifth rod 48 has a pair of mounting members 5
Flap folding plate (pressing member) 5 through 2, 54
6 is fixed. This flap folding plate 56
Has one end (a lower end in FIG. 2) 56a curved in an arc shape, and the vicinity of the curved portion 56a is fixed to the mounting members 52, 54. The other end (upper end in FIG. 2) 56b of the flap folding plate 56 is bent substantially at a right angle.

As described above, when the flap folding plate rotating cylinder 18 is operated, the L-shaped plates 14 and 16 are rotated.
Rotates around the first rod 12 in the direction of arrow A in FIG. When the L-shaped plates 14 and 16 rotate, the second rod 2 meshing with the large-diameter first gears 20 and 22 rotatably fitted to the first rod 12 serving as the rotation center thereof.
4, the second gears 26 and 28 having a small diameter
Rotate around. The rotation of the small diameter gears 26 and 28 causes the second rod 24 to rotate. Further, the second rod 2
4, a pulley 34 is fixed to the second rod 24.
The endless belt 40 travels in the direction of arrow B in FIG.

As the belt 40 runs, the pulley 38 of the third rod 30 and the pulley 36 of the fourth rod 32
Same direction as the second rod 24 (counterclockwise direction in FIG. 1)
To rotate. When the pulley 36 of the fourth rod 32 rotates, the other end of the fourth rod 32 (the L-shaped plate 1
6 is rotated. The third gear 46 is a fourth gear 50 of the fifth rod 48.
And the fifth rod 48 is connected to each of the rods 2.
It rotates in the direction opposite to the directions 4, 30, 32, that is, in the clockwise direction in FIG. The rotation of the fifth rod 48 causes the flap folding plate 56 to move the fifth rod 4
Rotating clockwise in FIG.

Accordingly, when the piston rod 18a of the rotating cylinder 18 is extended, the flap folding plate 56 rotates clockwise in FIG. 1 with the fifth rod 48 as a fulcrum and the fifth rod 48 as the fulcrum.
Due to the rotational movement of the first rod 12 in the direction of arrow A, the robot moves along the locus shown in FIG. 4 and finally stops in a substantially horizontal state (see a two-dot chain line in FIG. 1). .
When returning, the piston rod 18a of the cylinder 18
When is contracted, the trajectory rotates in reverse. Note that the mechanism for folding the flap described above does not interfere with the box 1 conveyed on the conveyor 2.
An appropriate space is formed inside.

When the main flap 1i is folded by the flap folding plate 56, it is provided on the opposite side of the mechanism for pressing the main flap 1i having the flap folding plate 56 therebetween with the conveying conveyor 2 therebetween. A pair of guide members (guide plates) 58 and 60 are provided for guiding the inserted flap 1j and inserting it into the inside of the box 1 (see FIGS. 1, 5 and 6).

The first fulcrum shaft 6 is located above the flap folding device main body 6 so as to traverse the space between the frames 10 and 11 on both sides.
2. The second fulcrum shaft 64 is supported at the lower part. The guide plate 5 is provided via links 66, 68 rotatably attached to both ends of the two fulcrum shafts 62, 64 and connecting shafts 70, 72 parallel to the fulcrum shafts 62, 64, respectively.
8, 60 are attached. The upper link 66 has the fulcrum shaft 62 located on the left side of FIG. 1 and the connecting shaft 70 on the right side, and the lower link 68 has the fulcrum shaft 64 located on the right side of FIG. 1 and the connecting shaft 72 on the left side.

One of the lower links 68 (left side in FIG. 6)
Is extended in a direction opposite to the side of the connection shaft 72 connected to the guide plate 60, and the tip of the main body 6 is
Cylinder 7 for vertically moving guide plate vertically mounted on
Four piston rods 74a are connected. When the cylinder 74 is not operated, that is, when the piston rod 74a is in a contracted state, the connecting shaft 72 of the lower link 68
Side is located lower than the fulcrum shaft 64, and the upper link 66
Similarly, the connection shaft 70 side is located below the fulcrum shaft 62 (the state shown in FIG. 1).

When the cylinder 74 operates to extend the piston rod 74a, the upper and lower links 66, 6
The connecting shafts 70 and 72 of 8 are moved upward with respect to the fulcrum shafts 62 and 64 by substantially the same angle as the angle facing downward during the non-operation. Therefore, when the elevating cylinder 74 is operated from the state shown in FIG. 1, when the lower link 68 becomes substantially horizontal in the middle thereof,
The lower part of the guide plates 58, 60 is swung to the left in FIG. 1 while ascending, and at the same time the upper link 66 is also substantially horizontal, so that the upper parts of the guide plates 58, 60 are raised to the right in FIG. Get dumped. After that, the cylinder 74
Of the piston rod 74a of each link 66, 6
When the connecting shafts 70 and 72 of the 8 move above the fulcrum shafts 62 and 64, the lower portions of the guide plates 58 and 60 are raised and return to the right side of FIG. 1 again, and the upper portions return to the left side of FIG. It will be in the state of having moved upward with the same posture as FIG.

When the guide plates 58 and 60 are lowered from the raised position, when the piston rod 74a is contracted by the operation of the cylinder 74, the guide plate 5
While lowering, the lower ends of 8, 60 are once shaken to the left (inside of the box 1 on the conveyor 2) in FIG. 1 and then moved to the right to return to the position shown in FIG. Conversely, the upper portions of the guide plates 58 and 60 return to the positions shown in FIG. 1 after being swung once to the right in FIG.

The guide plates 58 and 60 on both sides are provided with arc-shaped guide surfaces 5 on the surface facing the conveyor 2 side.
8a and 60a are formed. The arc of the guide surface is the largest box (the box shown by a solid line in FIGS. 1 and 4) in which the main flap 1i is bent by this device.
(1A) has a radius larger than a circular arc (indicated by D in FIG. 1) of a locus of rotation of the tip of the main flap 1i. The conveyor 2 is a front wall 1b of the box 1.
Is transported on the basis of (the surface indicated by the symbol X in FIGS. 1 and 4).
60, the lower ends of the arc-shaped guide surfaces 58a and 60a are in the lowered state (the position shown in FIG. 1).
It is arranged so as to be located above. Further, guide pieces (thin small plates) 58b, 60b are attached to lower ends of the arc-shaped guide surfaces 58a, 60a.

At the middle of the pair of guide plates 58 and 60, slightly below the lower end of the guide plates 58 and 60, there is provided a suction cup 76 for sucking the front wall 1b of the box 1 (FIG. 1). And FIG. 5). This sucker 76
Is attached to a piston rod 78a of a suction cup advancement / retraction cylinder 78 horizontally fixed to the lower part of the main body 6 in the direction of the conveyor 2 and moves forward and backward in the direction of the conveyor 2 by the operation of the cylinder 78. . The suction cup 76 is separated from the reference plane X to the outside of the conveyor 2 when retracted, and can contact and adsorb on the front wall surface 1b of the box 1 located on the reference plane X when moving forward. .

One of the guide plates 58, 60 (upper side in FIG. 5) is connected to the upper and lower connecting shafts 70, 7 respectively.
2 is supported movably in the horizontal direction. The guide plate 58 and the suction cup 76 can be moved along the fulcrum shafts 62 and 64 by a conventionally known rack and pinion mechanism 80, and the description thereof is omitted, but the guide plate 58 moves. Then, the suction cup 76 moves by a half of the moving amount.

As described above, the main body 6 of the flap folding apparatus is supported by two upright guide rods 8, 9 at its rear portion (right side in FIGS. 1 and 5) so as to be able to move up and down. Further, a bevel gear 86 fixed to a horizontal shaft 84 rotated by a handwheel 82 and a longitudinal axis 90 having a bevel gear 88 meshing with the bevel gear 86 are provided between the guide rods 8 and 9 at the upper part of the main body 6.
The main body 6 can be moved up and down by rotating the vertical axis 90.

Therefore, when the size of the box 1 into which the main flap 1i and the insertion flap 1j are folded is changed by the flap folding apparatus, the operation of the handle 82 causes the flap folding plate 5 to move.
6 can be integrally moved up and down, the guide plates 58 and 60, the suction cup 76, and the like. By this elevating operation, the lower ends of the guide plates 58 and 60 are adjusted according to the height of the box 1 so as to match the height of the opening 1h of the box 1. It should be noted that a motor may be attached instead of the configuration in which the handle 82 is operated manually.

The operation of the flap bending apparatus according to the above configuration will be described. As described above, the box 1 in which the articles are accommodated on the upstream side has the main flap (lid) 1.
Insert flap 1j provided continuously at the tip of i
Is folded at the fold line 1k in the temporary folding device, and then the side flaps 1f, 1g are folded inward, and then conveyed to the flap folding device by the conveyor 2. The conveyor 2 is operated intermittently and stopped at the position of the flap folding device.

At this point, the cylinder 18 for rotating the flap folding plate holds the L-shaped plates 14 and 16 at the positions shown by the solid lines in FIG. Let it rise. In addition, the guide plates 58 and 60 are raised by the lifting cylinder 74, and the suction cups 76 are at positions retracted by the forward / backward moving cylinders 78 so as not to interfere with the box 1 being carried in.

When the conveyor 2 carrying the box 1 is stopped, first, the suction cup 76 is moved by the suction / retraction cylinder 78.
Is moved forward and vacuum is applied to the suction cup 76 to adsorb the front wall 1b of the box.
6, the front wall 1b of the box 1 is pulled forward (to the right in FIG. 1). Next, the extended piston rod 74a of the guide plate lifting / lowering cylinder 74 is contracted. Then, the link 68 connected to the piston rod 74a swings about the fulcrum shaft 64 to lower the guide plates 58 and 60. When the guide plates 58 and 60 are lowered, the lower ends thereof are lowered from above, and the guide plates 58 and 60 are once swung inward of the box body 1 and then obliquely downward toward the inner surface of the front wall surface 1b of the box body 1. Move to. At the time of descending, as shown in FIG. 1, the thin small plates 58b, 60b attached to the lower ends of the guide plates 58, 60 abut against the inside of the front wall surface 1b of the box body 1 and press the wall surface 1b.

When the guide plates 58, 60 are vertically lowered from above in order to insert the small plates 58b, 60b attached to the lower ends of the guide plates 58, 60 into the inner surface of the box 1, the small plates 58b, 60b are lowered. Although there is a possibility that the lower end of 60b may interfere with the upper end of the front wall surface 1b of the box 1, the guide plates 58, 60 are moved downward from the inside of the box 1 while moving outward. Therefore, it can be inserted into the inner surface without interfering with the box 1.

As described above, both guide plates 58, 60
The small plates 58b and 60b attached to the lower end of
Then, the cylinder 18 for rotating the flap folding plate is operated after being brought into contact with the inner surface of the front wall surface 1b. When the piston rod 18a of the cylinder 18 extends,
The two L-shaped plates 14 and 16 start rotating around the first rod 12 in the direction of arrow A in FIG. When the L-shaped plates 14 and 16 rotate, the small gears 26 and 28 fixed to the second rod 24 rotate around the large gears 20 and 22 supported by the first rod 12, so that the second rod The reference numeral 24 rotates (rotates) while moving in the direction of the arrow A.

The rotation of the second rod 24 causes the pulley 34 fixed to the rod 24 to rotate, causing the endless belt 40 to run in the direction of arrow B in FIG. When the belt 40 runs, the rotation of the second rod 24
And the pulley 38 of the third rod 30 and the pulley 36 of the fourth rod 32 rotate in the same direction (counterclockwise direction in FIG. 1). When the rotation is transmitted via the belt 40 and the fourth rod 32 rotates, the fourth rod 3
The fifth gear meshing with the third gear 46 fixed to the second gear 46
The fourth gear 50 of the rod 48 rotates in the opposite direction (clockwise direction in FIG. 1) to the fourth rod 32, and rotates the fifth rod 48 in the direction of arrow C in FIG. A flap folding plate 56 is attached to the fifth rod 48 via a pair of attachment members 52 and 54, and rotates in the same direction as the fifth rod 48.

As described above, the flap folding plate 56
Is rotated in the direction of arrow C about the fifth rod 48, and the fifth rod 48, which is the center of rotation, rotates in the direction of arrow A about the first rod 12, as shown in FIG. Move along a trajectory.

Here, a case where the main flap 1i of the large box 1A (shown by a solid line in FIGS. 1 and 4) is bent will be described. When the flap folding plate 56 is not operated, it is located at the position indicated by reference numeral 56A in FIG. 4, that is, behind the main flap 1i. Abuts on the lower side of the main flap 1i and presses the flap 1i. As described above, the vicinity of the fold line (boundary to the rear wall surface 1c) 1p of the main flap 1i is pressed, so that the main flap 1i can be bent accurately along the fold line 1p. In addition, since the flap folding plate 56 not only rotates but also the fulcrum (the fifth rod 48) moves, the direction of the force acting on the flap 1i is smaller than when the flap folding plate 56 is rotated about the fulcrum provided at a fixed position. Can be bent reliably and easily along the fold line 1p from the upright state at the start of folding.

Further, the flap folding plate 56 is rotated while gradually moving toward the inside of the box 1 (see reference numerals 56B to 56H in FIG. 4), and the main flap 1i is gradually folded. At this time, the insertion flap 1j, which is provided at the tip of the main flap 1i and is preliminarily folded along the fold line 1k, enters the guide surfaces 58a, 60a of the guide plates 58, 60 from the middle. With the rotation, it is gradually bent to a state substantially perpendicular to the main flap 1i.

At the moving end of the flap folding plate 56, the flap folding plate 56 is in a substantially horizontal state (a state shown by a two-dot line in FIG. 1 and 56I in FIG. 4). Is completely closed.

In the process of bending the main flap 1i to a horizontal state, as described above, the insertion flap 1j gradually bent at a right angle with respect to the main flap 1i is used as the guide plate 58,6.
After being moved along the zero guide surfaces 58a, 60a, it is further guided by thin small plates 58b, 60b at the lower end thereof and inserted into the box body 1. At this time, the front wall surface 1b of the box 1 has the center portion pulled outward by the suction cup 76,
Further, since the both end portions are pressed outward by the small plates 58b and 60b, the insertion flap 1
j is smoothly inserted into the box 1. In particular, the suction cup 7
In the state in which the central portion of the front wall surface 1b is sucked and pulled out at step 6, both ends of the front wall surface 1b are likely to be recessed into the inner side of the box 1 on the contrary, so the small plates 58b, 60
The insertion flap 1j can be reliably inserted by pressing with the b.

Thereafter, the guide plates 58 and 60 are raised by the lifting cylinder 74, the vacuum of the suction cup 76 is released, the front wall 1b of the box 1 is separated, and the L-shaped plates 14 and By pulling back the flap folding plate 56 in FIG.
Then, the state shown by the solid line is returned, and the flap folding step of the box body 1 by the flap bending apparatus is completed.

When the size of the box 1 into which the main flap 1i is folded by the flap folding apparatus is small (the box 1 shown by a two-dot line in FIGS. 1 and 4).
(1B)), the flap folding plate 56 rotates around the fulcrum (the fifth rod 48), and the fulcrum 4
At the beginning of the movement of the box 8 from the outside of the conveyor 2 toward the box 1 due to the movement of the box 8, the box 8 does not come into contact with the box 1, but then starts to bend against the upper part of the main flap 1i. In this example, when the bending of the main flap 1i is started, the flap folding plate 56 is already inclined, but the fulcrum 48 moves from the back side of the main flap 1i toward the inside of the box 1. Therefore, a lateral force acts, and the bending can be surely performed.

In this embodiment, the small box 1
The case where (1B) has the same height as the large box 1 (1A) has been described. However, when the height of the box 1 is different, the main body 6 is moved up and down by operating the handle 82. The lower ends of the guide plates 58 and 60 are made to correspond to the height of the opening 1h of the box 1. Although the width of the box 1 is not described, it is adjusted by the rack and pinion mechanism 80 so that the pair of guide plates 58 and 60 are located near both ends of the inner surface of the box 1.
With this adjustment, the suction cup 76 is automatically positioned between the guide plates 58 and 60.

The shape and the movement trajectory of the flap folding plate 56 are not limited to those shown in the figure, and the flap folding plate 56 is supported by a fulcrum (fifth rod).
Any structure may be used as long as it rotates about the center 48 and moves the fulcrum 48 from the back side of the main flap 1 i toward the inside of the box 1. Further, in the above-described embodiment, the box 1 having a configuration in which the insertion flap 1j is inserted inside and sealed is used. However, the present invention is not limited to such a box 1, and for example, as shown in FIG. The flap 1j provided at the tip of the main flap 1i is also applicable to the box 1 having a configuration in which the flap 1j is adhered to the front wall 1b of the box 1 and sealed.

[0047]

As described above, the flap bending apparatus according to the present invention comprises a pressing member which rotates around a fulcrum.
By providing a moving means for moving the fulcrum position from behind the main flap in the direction in which the flap can be bent, it can be used for boxes of various sizes.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of a flap bending device according to an embodiment of the present invention.

FIG. 2 is a development view illustrating a driving unit of a pressing member provided in the flap bending device.

FIG. 3 is a perspective view sequentially showing the shape of a box in which a main flap is bent by the flap bending device and a process of bending each flap.

FIG. 4 is a diagram illustrating a movement locus of a pressing member (flap folding plate).

FIG. 5 is a plan view showing a guide plate and a suction cup.

FIG. 6 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 7 is a perspective view showing another example of a box in which a flap is bent by the bending device.

[Explanation of symbols]

 Reference Signs List 1 box 1h box opening 1i flap (main flap) 48 fulcrum (fifth rod) 56 pressing member (flap folded plate)

Claims (2)

[Claims] 1. A flap bending device for bending a main flap closing an opening at an upper portion of a box body by pressing the main flap with a rotating pressing member, wherein a fulcrum position serving as a rotation center of the pressing member is set from behind the main flap. A flap folding device provided with a moving means for moving the flap in a direction in which the flap can be bent. 2. A rotating means for rotating the pressing member,
The flap folding device according to claim 1, wherein the flap folding device is operated by the same drive source in conjunction with a moving means for moving the fulcrum position.