JPH04339710A - Gusset packaging device - Google Patents

Abstract

PURPOSE:To perform gusset folding by a unidirectional arrangement with the spreading end part as the center. CONSTITUTION:Four folding protuberances 5... are provided at both side ends of both folding plates 4, 4 in such a manner that they are respectively confronted with both ends of confronted surfaces A3, A3 on one side of a spreading end part A1, and are movable in a reciprocating way in the direction which is rectangular to the confronted surfaces A3, A3. Respective folding protuberances 5... removed inward interlocking with the closing motion of both folding plates 4, 4. By the closing motion of both folding plates 4, 4, confronted surfaces A2, A2 on the other side of the spreading end part A1 are respectively pinched in, and folded inward, and at the same time, respective folding protuberances 5... move inward and hit both side ends of the confronted surfaces A3, A3 on one side. By this motion, the inner wall 5a enters the spreading end part A1, and the confronted surfaces A3, A3 are folded inward into a triangle shape in such a manner that the entering quantity of the inner end 5a... becomes gradually longer from both side ends toward the center.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a case where an enveloping sheet is wrapped around a content in a cylindrical shape, and the overhanging ends of the enveloping sheet protrude in a rectangular cylindrical shape from the end face of the content. While one opposing surface is folded inwardly into a triangular shape along the end surface of the content by the closing movement of a pair of folding protrusions, the other parallel opposing surface is folded inward by the closing movement of a pair of folding plates. This invention relates to a gusset packaging device that overlaps and seals the ends in a straight line.

0002

[Prior Art] Conventionally, this gusset packaging device has, for example, provided triangular folding protrusions facing one opposing surface of the overhanging end so as to be movable in opening and closing, and facing the other opposing surface each having a sealing function. A folding plate is provided to be able to open and close freely, and the closing movement of both folding protrusions folds one opposing surface inward, while the closing movement of both folding plates overlaps the other opposing surface in a straight line and seals at the same time. There is.

0003

[Problems to be Solved by the Invention] However, in such a conventional gusset packaging device, both folding protrusions and their driving portions and both folding plates and their driving portions are arranged orthogonally with respect to the overhanging end. Because of this, nothing can be placed around the overhanging end.For example, when transporting the contents in a direction perpendicular to the protruding direction of the overhanging end, the contents are temporarily stopped and gusset-folded. If there is space for placement in only one direction around the center, either the double folding protrusion and its driving part or the double folding plate and its driving part cannot be placed, which complicates the structure and increases costs. There's a problem.

[0004]Also, since the tip is not supported by the abutment of the folding protrusion, the opposing surface is folded inward,
If the material of the enveloping sheet is strong and difficult to stretch, such as paper, it will be folded in almost exactly, but if it is made of a material that is weak and easy to stretch, such as polyethylene, the folding protrusion may be used. Due to the collision, both ends of the other facing surface are folded inward, making it impossible to perform accurate gusset folding with a symmetrical crease, and the tightness of the finished product is lost, resulting in poor appearance and lowering the product value. There is a problem that the value decreases significantly.

Furthermore, if the folds are sealed without forming a symmetrical shape, the leading edge of the overhanging end will not be in a straight line and will be uneven, so it must be cut into a straight line with a knife or the like in the subsequent process. Another problem is that the cutting operation is troublesome.

[0006] In view of such conventional circumstances, the first object of the present invention is to perform gusset folding in only one direction with the overhanging end as the center, and even if the enveloping sheet is made of a weak and easily stretchable material, it can be folded into folded protrusions. The second purpose is to fold only one facing surface, and the third purpose is to process the tip edge of the overhanging end into a straight line even if the envelope sheet is made of a material that is weak and easily stretches.

[0007]

[Means for Solving the Problems] The technical means taken by the present invention to solve the above-mentioned problems is to provide four folding protrusions on both ends of the double-folding plate, one of the projecting ends, and one of the opposite ends of the plate. It is characterized in that it is provided to face each other and to be able to reciprocate in a direction perpendicular to these, and that each folding protrusion moves inward in conjunction with the closing movement of these double-folding plates.

[0008] Then, 4
Four corner holding levers are provided so as to be reciprocally movable in the protruding direction of the overhanging end, and four corner holding grips are provided so as to be reciprocatable in the diagonal direction of the end surface of the contents at an angle of 45 degrees in the protruding direction of the overhanging end. is preferred.

Furthermore, it is preferable that a pair of clamping bodies be provided opposite the tip edges of the other sealed opposing surface so as to be able to reciprocate in a direction perpendicular to the other opposing surface and in a direction in which the overhanging end protrudes.

0010

[Operation] According to the technical means of the present invention, the other facing surfaces of the overhanging ends are pinched and folded inward by the closing movement of the double-folding plate, and at the same time, each folding protrusion moves inward. By hitting both ends of one opposing surface, the inner end enters the overhanging end and is folded inward.
The amount of insertion of the inner end gradually increases from both side ends toward the center, and the fold is folded into a triangular shape.

[0011]The four corner holding levers enter into the overhanging end and abut against the inner surfaces of the four corners, respectively, thereby forming the overhanging end into a stretched rectangular tube shape, and at this point, the four corner holding grips hold the overhanging end in place. With the closing movement of the double-folding plate and the internal movement of each folding protrusion, each corner grip grip moves inwards at an angle of 45 degrees in the diagonal direction of the end face of the content, thereby allowing one opposing face and On the other hand, the diagonal surface is gradually folded in while remaining taut.

Furthermore, during sealing, the pair of clamping bodies move closed to clamp the tip edge of the other opposing surface, and then the clamping bodies move in the direction in which the overhanging end protrudes, thereby removing the clamped tip edge. is cut in a straight line from the tip of the other sealed surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, compressible box-shaped contents B, in which a polyethylene enveloping sheet A is wrapped in a cylindrical shape, are placed on a transfer path C, and the contents are intermittently horizontally conveyed. A gusset folding device D is disposed facing the end face B1 of the contents B on both sides or only one side of the first upstream stop position C1 of the transfer path C, and temporarily seals the contents B. A fusing seal device E is disposed on both sides of the second stop position C2 or only on one side thereof, facing the content end surface B1.

[0014] The gusset folding device D is at the first stop position C1.
The projecting direction of the overhanging end A1 of the enveloping sheet A that faces the end surface B1 of the content B stopped at and projects from the end surface B1 in a square tube shape, in the illustrated example, the front-rear horizontal direction perpendicular to the transport direction of the content B A compression pusher 1 is provided to be able to reciprocate in both directions, four corner holding levers 2 are provided to be able to reciprocate in the front and rear horizontal directions facing the four corners of this overhanging end A1, respectively, and four corner holding grips 3 are provided. ..., respectively facing the square upper and lower opposing surfaces A2 and A2 of the overhanging end portion A1.
A pair of upper and lower folding plates 4, 4 are provided so as to be able to open and close along the content end face B1 in the vertical direction orthogonal to the upper and lower sides of the folding plates 4, 4, and parallel left-right opposing projecting ends A1 are provided at both left and right ends of the folding plates 4, 4. Four folding protrusions 5 are provided opposite the upper and lower ends of the surfaces A3, A3 and are movable back and forth in the left and right horizontal directions orthogonal to the left and right facing surfaces A3, A3, and the double folding plate 4,
4, the vertically opposing surface A2 of the overhanging end A1 on the side opposite to the content B;
It consists of a pair of upper and lower sealing machines 6 which are provided opposite A2 and can be opened and closed in substantially the same direction as the operating direction of the double-folding plates 4, 4.

The compression pusher 1 has an operating arm 1b installed horizontally on the outer surface of a pressing plate 1a whose size is smaller than the content end surface B1, supports both of them so as to be movable in the front and rear horizontal directions, and the outer surface of the operating arm 1b A drive unit such as an air cylinder is connected to the end.

[0016] The operation of this drive section is controlled by a control section,
In the initial state, the pressing plate 1a is separated from the overhanging end A1 and placed on standby, and just before or after the contents B stop at the first stop position C1, the pressing plate 1a is advanced and put into the overhanging end A1, and the contents B are placed in the overhanging end A1. It comes into contact with the end surface B1 and presses it to a predetermined position, and then, in conjunction with the closing movement of the double-folding plates 4, 4, which will be described later, the pressing plate 1a is moved back and returned to its initial state.

Each corner holding lever 2 is formed by bending the inner end of a wire rod extending in the longitudinal horizontal direction into a U-shape to form a corner contact portion 2a that comes into contact with and separates from the inner surface of each of the four corners of the overhanging end portion A1. ,
The outer end thereof is bent at a right angle, and a rotary drive unit 2b such as a rotary actuator is connected thereto, and a horizontal drive unit such as an air cylinder is connected to the outer end of this rotation drive unit 2b. The contact portion 2a and the rotary drive portion 2b are supported movably in left and right horizontal directions.

These rotary drive sections 2b... and the horizontal drive section are operated and controlled by a control section, and in the initial state, the corner contact section 2a
... are separated from the four corners of the overhanging end A1 and are kept in a standby position inward from each corner, and at the same time as the compression pusher 1 moves forward, the corner abutting parts 2a... are advanced and put into the overhanging end A1, and The contact portions 2a are rotated to push the inner surfaces of each corner of the overhanging end portion A1 outward, and then, after the corner grips 3 described later are held at the four corners, the corner contact portions 2a are rotated in the opposite direction and retreated. to return to the initial state.

Each corner clamping grip 3 has a driving part 3b such as an air cylinder at the outer end of a clamping piece 3a that can be opened and closed.
are arranged in series to support the holding piece 3a so that it can reciprocate in the front-rear horizontal direction and in the diagonal direction of the content end surface B1 at an angle of 45 degrees.

The operation of the clamping pieces 3a and the drive unit 3b is controlled by a control unit, and in the initial state, the clamping pieces 3a are opened and kept on standby away from the four corners of the overhanging end A1, and the corner holding lever 2 is moved forward. After rotation, the clamping pieces 3a... are moved forward and closed, and immediately after that, they are slightly retreated, and then, as will be described later, the clamping pieces 3a... 3a... move inwards diagonally at 45 degrees in the diagonal direction of the content end surface B1, and when they approach each other to a set distance, the clamping pieces 3a... are opened, and then,
While retracting the contents, the contents are moved outward diagonally at 45 degrees in the diagonal direction of the end surface B1 to return to the initial state.

The double-folding plates 4, 4 have upper and lower inner ends 4
a, 4a is the pressing plate 1a of the compression pusher 1 during compression.
The inner ends 4a, 4a are arranged on the same plane as the inner surface, and the side of the inner ends 4a, 4a opposite to the content B are inclined to form an acute-angled cross section,
A drive unit such as a cam, for example, is connected to these outer ends and supported so as to be able to reciprocate in the vertical direction.

The operation of these driving parts is controlled by the control part, and in an initial state, the inner ends 4a, 4a are kept on standby with the inner ends 4a, 4a separated from the base ends of the upper and lower facing surfaces A2, A2 of the overhanging end part A1, and the gripping pieces of the corner gripping grips 3... After 3a... is closed, the inner ends 4a, 4a
When the inner ends 4a, 4a approach each other to the set position, the closing movement is stopped, and then,
The folding protrusions 5, which will be described later, are moved out and then opened to return to the initial state.

Each folding protrusion 5 has an acutely protruding inner end disposed on the same plane as the inner surface of the pressing plate 1a of the compression pusher 1 during compression, and is movable back and forth in the left-right direction.
In conjunction with a guide arranged diagonally at 45 degrees, the folding plates 4, 4 are moved inward and outward in the left and right directions as they open and close. In the initial state, these folding protrusions 5 are placed on standby with their respective inner ends separated from the upper and lower base ends of the left and right opposing surfaces A3, A3 of the overhanging end portion A1, and the folding protrusions 5 are placed in a standby position in conjunction with the closing movement of the double folding plates 4, 4. Then, in conjunction with the opening movement of the double-folding plates 4, 4, they are moved outward and returned to the initial state.

The pair of sealing machines 6 have heater blocks 6a.
It has a conventionally well-known structure consisting of a heater block 6a and a heater receiver 6b, and as shown in FIG.
, 4b, and the inner end surfaces 6a1, 6, respectively.
b1 is placed away from the vertically opposing surfaces A2, A2 of the overhanging end A1 from the inner ends 4a, 4a of the double folding plates 4, 4,
An opening/closing drive unit 6 such as an air cylinder is provided at each outer end.
a2 and 6b2 are connected and supported so as to be able to open and close in the inclination direction, and the outer ends of these opening and closing drive parts 6a2 and 6b2 are connected to the drive parts of the double-folding plates 4 and 4.

These opening/closing driving parts 6a2 and 6b2 are operated and controlled by a control part, and the inner end faces 6a1 and 6b2 are in an initial state.
6b1 is placed on standby with the inner ends 4a, 4a of the double-folding plates 4, 4 separated from the vertically opposing surfaces A2, A2, and after the folding protrusions 5... are moved out, the inner end surfaces 6a1, 6b1 are moved closed to form the vertically opposing surface A2. , A2 are held in a straight line to form a temporary seal, and then the inner end surfaces 6a1 and 6b1 are opened to return to the initial state.

Further, a presser plate 7 is interposed between the heater block 6a and the folding plate 4, and the inner end 7a of the presser plate 7 is connected to the inner end surface 6 of the heater block 6a.
It is arranged to protrude slightly from a1, and the outer end and opening/closing drive part 6
An elastic body 7b, such as a spring, is provided between it and a2 to support it so that it can move in and out.

Furthermore, as shown in FIG. 2, in the transfer path C,
A suction port C3 is provided opposite the upper surface A2 of the overhanging end A1, and suction is applied from this suction port C3 to the upper surface A2 of the overhanging end A1.
In addition, a supporting punch C4 is provided horizontally to abut the lower surface A2 of the overhanging end portion A1 to prevent the lower surface A2 from sagging.

On the other hand, the fusing sealing device E is provided so as to be able to open and close vertically along the content end face B1, facing the tips of the temporarily sealed upper and lower opposed surfaces A2, A2, that is, the proximal end of the temporarily sealed part A4. A pair of upper and lower main sealing machines 8 and an upper and lower opposing surface A
2. It consists of a pair of upper and lower clamping bodies 9 that are disposed so as to be able to reciprocate in the up-down direction and in the front-rear horizontal direction, respectively, facing the leading edge of A2, that is, the leading end of the temporary seal part A4.

The pair of main sealing machines 8 are of a conventionally well-known structure consisting of a heater block 8a and a heater receiver 8b, similar to the sealing machine 6 described above. For example, a drive unit such as an air cylinder is operated and controlled by the control unit, and the inner end surfaces of the heater block 8a and the heater 8b are separated from the base end of the temporary seal part A4 in the initial state and are placed on standby, and the contents B are moved to the second stop position C2. Immediately before or immediately after stopping, the heater receiver 8b is first moved down, then the heater block 8a is moved up and closed, and then, after the later-described clamping body 9 is retreated, it is opened and returned to the initial state.

Furthermore, along the transfer path C, a first stop C1
A guide 8c on a thin plate is erected from between the second stop positions C2 to the second stop position C2 with its inner surface in sliding contact with the lower half of the content end face B1, and the upper end position of this guide 8c is The second
At the stop position C2, the guide 8c is set to the height from the upper surface of the transfer path C to the lower surface of the temporary seal section A4, or is moved upward, so that the upper end of the guide 8c comes into contact with the lower surface of the temporary seal section A4, as shown in FIG.

[0031] The pair of clamping bodies 9 have a horizontal placing piece 9a arranged below the tip of the temporary seal part A4, and this placing piece 9a
A drive unit such as an air cylinder is connected to the outer end of the temporary seal part A4 to support it so as to be able to reciprocate in the front and rear horizontal directions, and a presser piece 9b is arranged above the tip of the temporary seal part A4. A drive unit such as an air cylinder is connected to the end of the mounting piece 9a to support it so that it can reciprocate vertically and horizontally, and a suction chamber 9c that communicates with the outside of the fusing seal device is held on the outside of the upper surface of the mounting piece 9a. The suction chamber 9c is connected closely to the piece 9b, and a suction port 9d is provided on the holding piece 9b side of the suction chamber 9c to suck the temporary seal portion A4.

The operation of both of these driving parts is controlled by the control part, and in the initial state, the placement piece 9a is advanced to seal the temporary seal part A.
The presser piece 9b is brought into contact with and supported by the lower surface of the tip of the main sealing machine 8, and is moved upward while moving forward to stand by and separated from the upper surface of the tip of the temporary sealing part A4. is moved down to pinch the tip of the temporary seal part A4, and then both the placement piece 9a and the holding piece 9b are moved back, and further thereafter, the holding piece 9b is moved up to release the holding of the tip of the temporary seal part A4. After that, both the holding piece 9b and the mounting piece 9a are moved forward to return to the initial state.

Next, the operation of the gusset packaging device will be explained. First, when the content B transferred from the initial state as shown in FIG. 2 stops at the first stop position C1, the compression pusher 1 of the gusset folding device D advances as shown in FIG. When pressed, contents B are compressed and positioned.

[0034] At approximately the same time, the corner holding lever 2 also moves forward and enters the projecting end A1, and the inner surfaces of its four corners are spread outward, so that the projecting end A1 is held stretched over the rectangular cylinder.

After that, as shown in FIG.
... moves forward and pinches the four corners of the overhanging end A1 stretched over the square tube, and further retreats slightly to pull the overhanging end A1 in the direction of its protrusion.

Around this time, the double-folding plates 4, 4 start to close, and the upper and lower opposing surfaces A2, A2 of the overhanging end A1 are respectively folded inward along the content end surface B1, and the folding protrusions 5 are also folded inward. The left and right opposing surfaces A3 and A3 are folded inward along the content end surface B1, respectively.

Accordingly, the corner holding grips 3 move inwards at an angle of 45 degrees in the diagonal direction of the content end surface B1, and the inner ends 4a, 4a of the double-folding plates 4, 4 and the inner ends of the folding protrusions 5... 5a engages with the circumferential line of the content end surface B1, the compression plate 1 and the corner holding lever 2... simultaneously retreat and exit from the overhanging end A1.

Thereafter, as shown in FIG. 5, when the inner ends 4a, 4a of the double-folding plates 4, 4, the corner grips 3, and the inner ends 5a of the folding projections 5 approach the set positions, the double-folding plates 4, 4 are folded together. The closing movement of the folding plates 4, 4 and the inward movement of the folding protrusions 5... are stopped, the folding protrusions 5... are moved outward, and the corner grips 3... are separated and retreated from the four corners of the overhanging end portion A1.

When the folding protrusions 5... move outward and leave the left and right facing surfaces A3, A3 which are folded inward into a triangular shape, the sealing machine 6 starts to close as shown in FIG. 7 and the heater receiver 6b sandwich the tips of the upper and lower facing surfaces A2, A2 and overlap them in a straight line, and then sandwich them between the heater block 6a and temporarily seal. Therefore, the temporary seal does not shift its position and the finish is clean.

Then, the contents B for which the temporary seal has been applied are transferred on the transfer path C, and are moved to the second stop position C2 as shown in FIG.
The base end of the temporary seal portion A4 is supported on the guide 8c of the fusing seal device E, and the temporary seal portion A4 is
4 is supported on the mounting piece 9a of the clamping body 9.

When the content B stops at the second stop position C2, the main sealing machine 8 starts the closing movement as shown in FIG. After that, the heater block 8 is installed as shown in FIG.
The book is sealed by inserting it in a.

[0042] Therefore, the seal does not shift its position and has a clean finish. At about the same time, the holding piece 9B of the clamping body 9
10, the tip of the temporary seal portion A4 is sandwiched between the placement pieces 9a, and immediately after that, these placement pieces 9 are closed as shown in FIG.
a and the presser piece 9b move back, and the tip of the temporary seal part A4 is linearly cut off from the base end of the temporary seal part A4 held by the main sealing machine 8.

After that, the presser piece 9b is opened and the tip of the separated temporary seal part A4 is inserted into the suction port 9 of the suction chamber 9C.
d attracts and eliminates.

After that, the main sealing machine 8 is opened and the contents B are transferred, and the above-described operation is repeated.

[0045] Therefore, in this embodiment, the seal is fused and cut after the temporary sealing, so that the sealing strength is improved.

[0046] In the above embodiment, the enveloping sheet A was wrapped around the compressible contents B on the cylinder, but
The present invention is not limited to this, and when wrapping the envelope sheet A around the uncompressible box-shaped contents B on a cylinder, the compression pusher 1 may not be provided in the gusset folding device D.

A gusset folding device D is also provided along the transfer path C.
Although the fusing sealing device E and the fusing sealing device E are arranged separately, the present invention is not limited to this, and by incorporating the clamping body 9 into the gusset folding device D, both devices D and E may be integrated.

[0048]

[Effects of the Invention] Since the present invention has the above structure, it has the following advantages. 1. Due to the closing movement of both folding plates, the other facing surfaces of the overhanging ends are respectively pinched and folded inward, and at the same time, each folding protrusion moves inward and abuts both ends of the one facing surface. The inner end enters the overhanging end and is folded inward, and the amount of insertion of the inner end gradually becomes longer as you move from both ends toward the center, and is folded into a triangular shape, so it can be folded in one direction around the overhanging end. Gusset folding can be done by simply arranging it.

Therefore, compared to the conventional system in which the two folding protrusions and their driving portions and the two-folding plates and their driving portions are arranged directly orthogonally around the overhanging end, for example, the contents can be transferred to the overhanging end. Even when there is space for placement in only one direction around the projecting end, such as when the projector is transported in a direction perpendicular to the projecting direction and then temporarily stopped for gusset folding, the structure can be simplified and costs can be reduced.

2. By entering the four corner holding levers into the overhanging end and abutting the inner surfaces of the four corners, the overhanging end becomes a stretched square tube, and at this point, the four corner holding grips are overhanging. By holding the four corners of the end portion and moving inwards at 45 degrees in the diagonal direction of the end face of the contents, each corner holding grip moves inwards at an angle of 45 degrees in the diagonal direction of the end face of the contents as the double folding plate closes and the folding protrusions move inwards. Since the other body corner surface is gradually folded in while being stretched, even if the covering sheet is made of a material that is weak and easily stretches, only one opposing surface can be folded in using the folding protrusion.

Therefore, compared to the conventional method in which the opposing surface is folded inward while the tip is not supported by the abutment of the folding protrusion, the fold of the gusset fold can be made symmetrical along the ridgeline, and the finished product can be made tighter. This improves the appearance and product value.

3. At the time of sealing, the pair of clamping bodies closes and clamps the tip edge of the other opposing surface, and then the clamping bodies move in the direction in which the overhanging end protrudes, so that the clamped tip edge closes on the sealed other side. Since it is cut in a straight line from the tip of the opposing surface, even if the enveloping sheet is made of a material that is weak and easily stretches, the tip edge of the overhanging end can be processed in a straight line.

[0053] Therefore, compared to the conventional method in which the tip edge of the uneven overhanging end portion has to be cut with a knife or the like after sealing, the cutting operation can be omitted and the work can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a gusset packaging device showing an embodiment of the present invention.

FIG. 2 is a side view showing the operation progress of the gusset folding device.

FIG. 3 is a side view showing the operation progress of the gusset folding device.

FIG. 4 is a side view showing the operation progress of the gusset folding device.

FIG. 5 is a side view showing the operation progress of the gusset folding device.

FIG. 6 is a side view showing the operation progress of the gusset folding device.

FIG. 7 is a longitudinal side view showing the operation progress of the fusing seal device.

FIG. 8 is a longitudinal side view showing the operation progress of the fusing seal device.

FIG. 9 is a longitudinal sectional side view showing the operation progress of the fusing seal device.

FIG. 10 is a longitudinal side view showing the operation progress of the fusing seal device.

[Explanation of symbols]

Claims (3)

[Claims] Claim 1: An enveloping sheet is wrapped around the contents in a cylindrical shape, and one parallel opposing surface of the overhanging end of the enveloping sheet that protrudes from the end surface of the contents in a rectangular cylindrical shape is By the closing movement of the folding protrusions, the content is folded inward into a triangular shape along the end surfaces of the folding pieces, while the other parallel opposing surfaces are folded inward by the closing movement of the pair of folding plates, so that the tips thereof are aligned in a straight line. In the gusset packaging device for overlapping and sealing, four folding protrusions are provided at both ends of the double-folding plate, each facing the two ends of the one-way opposing surface of the overhanging end and reciprocally movable in a direction orthogonal thereto. A gusset packaging device characterized in that the folding protrusions are moved inwardly in conjunction with the closing movement of these double-folding plates. 2. Four corner holding levers are provided opposite to the four corners of the overhanging end so as to be movable back and forth in the projecting direction of the overhanging end, and four corner holding grips are provided opposite to the four corners of the overhanging end so as to be movable back and forth in the projecting direction of the overhanging end. The gusset packaging device according to claim 1, wherein the gusset packaging device is provided so as to be able to reciprocate at an angle of 45 degrees in a diagonal direction of the end face of the contents. 3. Claim 1 or 2, wherein a pair of clamping bodies are provided opposite to the tip edge of the other sealed opposing surface so as to be able to reciprocate in a direction perpendicular to the other opposing surface and in a direction in which the overhanging end protrudes. Gusset wrapping equipment as described.