JPH07115695B2 - Method and device for opening a package in which articles having steps are accumulated - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention collects a large number of articles (A) having a step (a) formed at the edge as shown in FIG. As shown in FIG. 14, the present invention relates to a method and an apparatus for opening a package (C) which is packaged in one package with a packaging material (B).

[Conventional technology]

For example, as a container for storing liquid beverages such as milk and juice, there is a rectangular tubular container as shown in FIG. When such a container is folded so as not to be bulky, a large number of such containers are stacked and the outer side thereof is packaged in one package with the packaging material (B) as shown in FIG. This is opened.

However, this opening is conventionally performed by hand.

[Problems to be solved by the invention]

However, as shown in Fig. 12, the flat-folded one as shown in Fig. 13 is expanded into a rectangular tube shape, and the work of molding the bottom is performed by a machine. It is necessary to always set a flat folded product (Fig. 13) in the magazine part, and it is extremely inefficient to open the magazine by hand.

In particular, when the machine is operated at high speed, the flatly folded containers in the magazine are quickly lost and must be replenished frequently. However, when the opening operation is performed by hand, the operator becomes extremely urgent and the fatigue level becomes considerable.

In the present invention, for example, in such a case, attention is paid to the fact that the step (a) is formed on the article (A) to be handled,
When a large number of these are accumulated and packaged in one package with the packaging material (B), the void (d) formed between the article (A) and the packaging material (B) is effectively used in the step (a) portion. By doing so, the opening can be performed automatically and efficiently.

[Means for solving problems]

The unsealing method according to the present invention means that the cutting blade (E) acts on the gap (d) between the article (A) and the packaging material (B) in the step (a) portion to cause the packaging material ( B) is cut, and the packaging material (B) is cut in a direction orthogonal to the cutting direction on three continuous surfaces including the cut surface.

Further, the unsealing device according to the present invention is parallel to the conveyance direction of a package (C) in which a large number of articles (A) having steps (a) are stacked and the outer side of which is packaged with a packaging material (B). And a cutting blade (E) that operates toward the gap (d) between the article (A) and the packaging material (B) at the step (a).
And the packaging material (B) in three directions including the surface cut by the cutting blade (E) in a direction orthogonal to the cutting direction.
And cutting blades (F), (G ₁ ) and (G ₂ ) for cutting.

[Work]

For example, an article (A) for containing a liquid beverage such as milk or juice as shown in FIG. 12 has a step as shown in (a), which can be folded as shown in FIG. When a large number are accumulated and the outside is wrapped with the packaging material (B),
The package (C) shown in Fig. 14 is obtained. In such a package (C), in the step (a) portion of the article (A), a space shown in (d) of FIG. 14 is formed between the article (A) and the packaging material (B). Moreover, this void (d) continues from one end of the package (C) to the other.

In the present invention, the cutting blade (E) is made to act toward this void (d). Then, as shown in FIG. 8, the outer portion of the article (A) in which the step (a) is formed, that is,
The portion indicated by the broken line (e) in FIG. 15 is cut, but the cutting edge (E) does not reach the article (A) because the void (d) exists, and the product is damaged. Never attached.

Next, three continuous planes including the plane (e ') cut by the cutting blade (E), that is, (e'), (g ') and (g') in FIGS. 14 and 15 are shown. The packaging material (B) is cut on the three surfaces in a direction orthogonal to the cutting direction. That is, the surface (e ') cut by the cutting blade (E) is cut (f) in a direction perpendicular to the cutting line (e) as shown in FIG. 15, and the other two surfaces are cut. In (g ') and (g'), on the extended line of the cutting line (f), that is, the (g ₁ ) and (g ₂ ) portions in FIG. 15 are cut.

Thus, one package (C ') has voids (d) on three consecutive surfaces (e'), (g '), (g').
A cutting line (e), a cutting line (f) orthogonal to the cutting line (e), and a cutting line (g ₁ ), (g ₂ ) is applied. Therefore, the part of the packaging material (B) shown in FIG. 15 (b) can be separated from the three cutting lines (f), (g ₁ ), (g ₂ ) and the cutting line (e). The surface marked with () can be exposed from the cutting line (e).

Further, according to the unsealing device of the present invention, a large number of articles (A) having the step (a) formed thereon and the outside thereof are wrapped with the packaging material (B), and a package (C) in the conveying direction. A package is obtained by relatively moving a cutting blade (E) which is parallel and acts toward a space (d) between the article (A) and the packaging material (B) in the step (a). The (e ') plane of (C) is provided with a cutting line shown in (e),
Furthermore, the packaging material (C ') provided with the cutting line (e) and the packaging material (B) in a direction orthogonal to the cutting line (e) on three surfaces including the surface cut by the cutting blade (E). ) Is moved relative to the cutting blades (F), (G ₁ ) and (G ₂ ), so that three consecutive surfaces of the package (C ′) provided with the cutting line (e) are moved. (E '), (g'),
Cutting lines (f), (g ₁ ), and (g ₂ ) are formed on (g ′) on the same line.

〔Example〕

 Embodiments of the present invention will be described with reference to the accompanying drawings.

In the embodiment, the article (A) having the step (a) is described as a container for containing a liquid beverage such as milk or juice, but the container is not necessarily limited thereto.

Such an article (A) having a step (a) is once folded as shown in FIG. 13 so as not to be bulky, a large number of these are accumulated and the outside thereof is wrapped with a packaging material (B) as shown in FIG. 1. Package and store in a lump, and open this when filling a liquid beverage. In the embodiment, the case of opening such a package (C) will be described. The wrapping material (B) means not only wrapping paper generally used for wrapping, but also synthetic resin film, heat-shrinkable film and the like that can be cut by a cutting blade.

In such a package (C), a gap (d) [first section (a)] is provided between the article (A) and the packaging material (B).
14] exists in the longitudinal direction of the package (C). In the opening method of the present invention, this void portion (d) is effectively used. That is, the cutting blade (E) is caused to act toward the void (d) to cut the packaging material (B) at the portion. Although the cutting blade (E) in the embodiment is a so-called rotary type, it is not necessarily limited to this type, and any point may be used as long as it acts toward the void (d). In this way, when the cutting blade (E) is made to act toward the void (d), as shown in FIG.
The outer portion of the article (A) on which the ridge is formed, that is, the portion indicated by the broken line (e) in FIG. 15 is cut, but since the cutting edge of the cutting blade (E) has a void (d). The article (A) is never reached, and the article is not scratched.

Next, three continuous planes including the plane (e ') cut by the cutting blade (E), that is, (e'), (g ') and (g') in FIGS. 14 and 15 are shown. The packaging material (B) is cut on the three surfaces in a direction orthogonal to the cutting direction. That is, on the surface (e ') cut by the cutting blade (E), as shown in FIG.
(F) at a right angle to the cutting plane, and on the other two planes (g ′) and (g ′), on the extension line of the cutting line (f), that is, (g ₁ ) and ((g ₁ ) in FIG. g ₂ ) Cut each part. Even when cutting these parts, the cutting blade (E)
The same type can be used. In applying the corner cutting lines (e), (f), (g ₁ ) and (g ₂ ), the cutting blade is moved with respect to the package (C) or the cutting group is not moved. The object (C) may be moved. In short, the packaging material (B) can be cut by moving the cutting blade and the package (C) relatively.

Thus, one package (C ') has voids (d) on three consecutive surfaces (e'), (g '), (g').
A cutting line (e), a cutting line (f) orthogonal to the cutting line (e), and a cutting line (g ₁ ), (g ₂ ) is applied. Therefore, the part of the packaging material (B) shown in FIG. 15 (b) can be separated from the three cutting lines (f), (g ₁ ), (g ₂ ) and the cutting line (e). The surface marked with () can be exposed from the cutting line (e). Then,
As shown in FIG. 15, cut lines (f), (g ₁ ) and (g ₂ ) on both sides of the package (C ′), that is, on the side opposite to (b) at the same position as the side (b). When applied, three cut lines (f), (g ₁ ) on both sides of one package (C ′),
Since the parts (b) and (b ') can be separated from (g ₂ ) and the remaining part can be separated from the cutting line (e), one package (C') excludes the bottom. The five sides are completely opened so that the mouth is open. The cutting on both sides of one package (C ') may be carried out one by one, but it is extremely efficient to carry out cutting on both sides simultaneously.

When the cutting lines (f), (g ₁ ) and (g ₂ ) are applied, as shown in (B ₁ ) of FIG. 10 or (B ₂ ) of FIG. 11, packaging material (B) is used. It is preferable that the packaging material (B) is cut with a slack, and a gap (d ′) is formed between the article (A) and the packaging material (B) at the portion. By doing so, it is possible to avoid accidentally scratching the article (A) as in the case of making the cutting line (e).
In order to give the slack (B ₁ ) or (B ₂ ) to the wrapping material (B), the wrapping (C ′) should be in the F ₁ direction in FIGS. 9 and 14.
Tighten from F ₂ direction. Especially, when the package (C ') is tightened from the F ₁ direction, L ₀ before compression (Figs. 9 and 14)
The length of the existing package is shortened to L ₁ (Figs. 10 and 11) depending on the accumulation state of the article (A) as the article to be packaged, and accordingly the upper surface (near the end surface of the package (C ') ( e ′) has the tenth
As shown in (B ₁ ) of the figure, and the other two surfaces (g ′) and (g ′) have slack in the packaging material (B) as shown in (B ₂ ) of FIG. (D ') in FIG. 10 and FIG. 11 between the aggregated product (A) which is the product to be packaged.
A void portion indicated by is formed. Therefore, by applying the cutting blades (F), (G ₁ ) and (G ₂ ) toward the void (d ′), the article (A) to be packaged can be opened without damaging it. . Even if the package (C ') is tightened from the F ₂ direction at the same time as the F ₁ direction, the length of L ₂ in Fig. 11 and Fig. 14 does not change depending on the accumulated state of the article (A) to be packaged. .

Next, an embodiment of an apparatus for performing this opening direction will be described with reference to the accompanying drawings.

The package (C) shown in FIG. 14 is conveyed in the direction of the arrow in FIG. 3 by the conveying device shown in (1) of FIGS. 1 to 3, and before the stopper (2) provided immediately before it. The pusher (3) pushes it out of the transport device (1). The package (C) moved from the position P _{1 to} the position P ₂ is pushed rightward in FIG. 3 by the pushing member (4). In addition,
In the illustrated example, the pushing member (4) is screwed to the screw rod (5) arranged in the left-right direction of FIG. 3, and the screw rod (5) is rotated by the filter motor (6) to cause the screw rod (5) to rotate. It can be moved to the right.

During the transportation of the package (C) by the pushing member (4), the article (A) and the packaging material (B) are parallel to the transport direction and at the step (a) portion of the article (A) which is the object to be packaged. A cutting blade (E) is installed which acts toward the void (d) formed between In the embodiment, since the package (C) is transported so that the void (4) is located on the upper surface of the package (C), the cutting blade (E) is installed on the transport path of the package (C). However, the installation position is not limited to this case, and the position and orientation can be freely changed according to the appearance of the package (C) being conveyed.
Further, although the cutting blade (E) is of a rotary type in the embodiments, it is not necessarily limited to this. Further, in the embodiment, the case where the cutting blade (E) is fixed so as not to move on the conveying path of the package (C) is shown, but it may be provided so that it can be moved in the conveying direction of the package (C). The point is that the cutting blade (E) and the package (C) may be relatively moved. Further, it is preferable that the installation position of the cutting blade (E) can be changed according to the height of the package (C '). The cutting blade (E) cuts a line on the package (C) at the portion indicated by the broken line (e) in FIG. That is, the cutting blade (E) and the package (C)
When and are relatively moved, as shown in FIG. 8, the outer portion of the article (A) in which the step (a) is formed, that is,
The part indicated by the broken line (e) in FIG. 15 is cut. In this case, since the void (d) exists between the article (A) and the packaging material (B) in the package (C), the cutting edge of the cutting blade (E) may reach the article (A). There is no damage to the product.

In front of the cutting blade (E) (on the right side in FIG. 3), at the moving position P ₃ of the package (C ') in which a part of the packaging material (B) has been cut by the cutting blade (E), the package. A descending port (7) (Fig. 2 to Fig. 4) of (C ') is provided, and a fourth port is provided at this portion.
As shown in detail in the figure, a pair of left and right receiving pieces (8), (8) are provided so as to rotate from the state of the chain line in the figure to the position of the solid line, and both receiving pieces (8) are provided. A stand (10), which is placed between 8) and 8), is provided so that it can be moved up and down. As shown in FIG. 2, this platform (10) descends from the descending port (7) to the position below it, indicated by the solid line in FIG. The pair of left and right receiving pieces (8), (8) temporarily receives the package (C ') transferred to the position P ₃ , and the platform (10) is placed between the receiving pieces (8), (8). Even when the package is not facing, it serves to prevent the package (C ') from dropping from the descending port (7). When the pair of left and right receiving pieces (8) and (8) are operated symmetrically, for example, one of the levers fixed to the respective shafts (9) and (9) is operated by a cylinder. , One rod connecting both levers can transmit the movement to the other lever. Then, a pair of left and right receiving pieces (8),
When (8) is opened as shown by the solid line in Fig. 4, respectively, the packages (C '), which have been on the receiving pieces (8) and (8) until now, are supported only by the ascending base (10). It is then lowered to the position of P ₄ in Fig. 2 by the descent of Hijidai (10). When the platform (10) is moved up and down, for example, as shown in FIG. 7, the upper end of a vertical screw rod (11) is attached to the platform (10) and screwed onto the screw rod (11). A method can be adopted in which the rotational force of the motor (15) is transmitted to the female screw cylinder (12) via the belt (14).

On the other hand, when the table (10) is at the lowest position, on the side (left or right side in FIGS. 1, 5, and 6) of the package (C) cut by the cutting blade (E). ′)
The cutting blades (F), (G ₁ ) and (G ₂ ) which operate in the direction orthogonal to the cutting direction of the cutting blade (E) with respect to three continuous surfaces including one surface (e ′) of Deploy. In the embodiment, the cutting blade (F) has a cutting line (f) perpendicular to the cutting line (e) on the surface (e ′) of the package (C ′) cut by the cutting blade (E). The cutting blades (G ₁ ) and (G ₂ ) are to be applied, and the cutting lines (g ₁ ) and (G ₂ ) are formed on the extension lines of the cutting line (f) on the other two surfaces (g ′) and (g ′). ₁ ) and (g ₂ ) are applied. Then, the package (C '), which has been subjected to the cutting line (e) by the cutting blade (E), is placed on the table (10), and in this state, the cutting line (f) is applied to the packaging material (B). ), (G ₁ ) and (g ₂ ) respectively, the cutting blade (F) on the surface (e ′) in the direction orthogonal to the cutting line (e), and the two surfaces (g ′) , (G ') beside the cutting blade (G ₁ ),
(G ₂ ) must be moved vertically. Therefore, in the embodiment, the cutting blade (F) is provided in the block (17) which can move in the horizontal direction with respect to the frame body (16) arranged on the side of the base (10), and the cutting blade (G ₁ ). , (G ₂ ) is the frame (16)
The blocks (18), which can move in the vertical direction, are attached to each other (Figs. 5 and 6). The block (17) is screwed to a horizontal screw rod (20) which is rotated by a motor (19), and the horizontal rods arranged on the left and right sides of the screw rod (20) are rotated. Guide rod (21),
The block (18) is moved along the (21) in the vertical direction of FIG. 6, and the block (18) is screwed onto a vertically arranged screw rod (23) which is rotated by a motor (22). Screw rod (2
By the rotation of 3), it moves vertically along the vertical guide rods (24), (24) arranged on the left and right thereof. Therefore, the cutting blade (F) attached to the block (17) is a portion (f) orthogonal to the cutting line (e) of the surface (e ') of the package (C') on the table (10). Also, the two cutting blades (G ₁ ) and (G ₂ ) attached to the block (18) have the package (C ′) mounted on the base (10).
2 (g ') and 2 (g'), which are continuous with the surface (e '), are cut at the portions (g ₁ ) and (g ₂ ) on the extension of the cutting line (f). Thus, one package (C ') has three consecutive faces (e'), (g '), (g'),
A cutting line (e), a cutting line (f) orthogonal to the cutting line (e), and a cutting line (g) on the extension line of the cutting line (f) in a portion corresponding to the outside of the void (d). ₁ ) and (g ₂ ) are applied. Therefore, the portion of the packaging material (B) indicated by (b) or (b ') in FIG. 15 can be separated from the three cutting lines (f), (g ₁ ) and (g ₂ ), and The surface provided with the cutting line (e) can be exposed from the cutting line (e) portion. The above device is shown in FIG.
As shown in FIG. 5, if it is provided on both sides of the base (10) so as to face each other, the above-mentioned cutting can be performed on both sides of one package (C ′) as shown in FIG. 15, which is extremely convenient. is there.

The stop position of the table (10) is changed according to the height of the package (C), in other words, the height of the article (A) wrapped with the packaging material (B). In this way, the relative position between the upper surface of the package (C) and the cutting blade (F) is constantly constant, so that it is possible to cut all packages having different heights with one device. That is, when the article (A) is a container for containing a liquid beverage as shown in the examples, the height of the article (A) varies depending on its capacity, but as described above, By changing the stop position of the base (10) according to the height, it is possible to accurately cut all the packages (C) having different heights by using one device.

On the other hand, in the embodiment, the frame body (16) can be moved laterally of the table (10) in the lateral direction of FIG.
With this arrangement, the cutting blades (F), (G ₁ ), (G ₂ ) are used when the package (C) descends together with the table (10) or when the package (C ′) after cutting is further lifted. ) Not only can be retracted out of the way,
Depending on the size of the package (C) or (C '), the table (1
0) Accurate positioning on each and each cutting blade (F),
The setting positions of (G ₁ ) and (G ₂ ) can be easily adjusted. In moving the frame body (16), in the embodiment, the cylinder (25) is used to move the base (16 ') of the frame body (16) along the two guide rods (26) and (26). The case where it is moved horizontally is shown.

Further, in the embodiment, the crimping plate (27) (fifth portion) is provided on the inner surface of the two frame bodies (16), (16), that is, the portion facing the base (10).
(Fig. 6, Fig. 6) are attached respectively. This is the two end faces (b) of the package (C) on the table (10),
This is for pressing (b '). Both crimp plates (2
When the package (C) is pressed from the F ₁ direction of Figs. 9 and 14 by 7) and (27), the length of the package before compression L ₀ (Figs. 9 and 14) is Depending on the accumulation state of the packaged item (A), it shrinks down to L ₁ (Figs. 10 and 11), and accordingly, the upper surface (e ') near the end face of the packaged item (C) is shown in Fig. 10 ( As shown by B ₁ ), the other two faces (g ′),
As shown in FIG. 11 (B ₂ ), slack is generated in the packaging material (B) in (g ′), and the wrapping material (B) and the aggregate of the articles (A) to be packaged are shown in FIGS. 10 and 11. A void portion shown in (d ') of the figure is formed. Therefore, the cutting blade (F),
When the packaging material is cut by (G ₁ ) and (G ₂ ), the article (A) that is the object to be packaged is not damaged. As shown in FIGS. 5 and 6, two of the four side surfaces of the package (C) are used.
When the crimping plates (28) and (28) that press two opposing surfaces other than the pressing surface from the F ₂ direction by the crimping plates (27) and (27) are arranged together with the crimping plate (27), the package (C ) Can be tightened from all sides, so slacks (B ₁ ) and (B ₂ ), (B ₂ ) are surely formed in the package (C), and the packaged item (A) is damaged. It is possible to accurately cut the portion without using the cutting blades (F), (G ₁ ) and (G ₂ ). In the embodiment, both of the crimping plates (28) are movable back and forth with respect to the base (10). As concrete means thereof, as shown in FIG. 6, for example, the crimping plate (28) is directly connected to the cylinder (29), and the operation thereof causes the crimping plate (28) to have two guide rods (30), (30). The case of moving along can be mentioned. In this way, two crimp plates (28), (28)
When the package (C) is lowered, the crimping plate (28) is retracted so that it does not get in the way when the package (C) descends together with the table (10) or when the package (C ') after cutting is further lifted. Not only can be stored, but also the package (C),
Accurate positioning can be easily performed on the table (10) according to the size of (C ').

Further, in the embodiment, two adjacent side surfaces (b) and (g ') of the four side surfaces of one package (C) are pressed 2
One crimping plate (27), (28) and two crimping plates (27), (2) that press the other two adjacent side faces (b), (g ')
Although the moving distance from 8) is made different, this makes it possible to position one package (C) on the table (10) with one set of crimp plates (27), (28), Since one package (C) can be fastened from four sides with the other pair of crimping plates (27) and (28), the packaging material (B) can be accurately cut at a predetermined position.

In addition, the size of the article (A) that is the object to be packaged, in other words, 1
In order to detect the size of one package (C) on the transport device (1), two photoelectric tubes (not shown) are provided at different heights, or the package is detected to have a different mark. It is a common practice to provide a device for this purpose, and these devices can also be adopted as the opening device of the present invention.

〔The invention's effect〕

When the unsealing method of the present invention is adopted, it is possible to skillfully perform the unsealing of a package in which articles having steps are accumulated, and when the unsealing device of the present invention is used, a package in which articles having steps are accumulated is used. Items can be opened automatically and efficiently.

[Brief description of drawings]

The accompanying drawings are for explaining the embodiments of the present invention. FIG. 1 is an elevation view of the entire apparatus, FIG. 2 is a side view thereof, FIG. 3 is a plan view, and FIG. FIG. 5 is an enlarged side view of only the vicinity of the lowering port of the package, FIG. 5 is an enlarged front view showing only a portion corresponding to the lower side of the lowering port, FIG. 6 is its enlarged plan view, and FIG. FIG. 8 is a perspective view showing a cut state of the packaging material at the stepped portion, and FIG. 9 is a view showing the state in which the package is cut in more detail. FIG. 10 is a plan view showing the state immediately before, FIG. 10 and FIG. 11 are front views and plan views showing the state after activating two left and right crimp plates of the four crimp plates, and FIG. FIG. 13 is a perspective view showing an example of an article having a step, showing the article in a state of being expanded into a tubular shape. FIG. 13 shows the article folded flat. FIG. 14 is a perspective view showing a state in which a large number of flat-folded articles having steps are accumulated, and the outside thereof is wrapped with a packaging material. FIG. FIG. 4 is a perspective view of the package after being processed. (10) ... stand, (16) ... frame, (27), (28) ... crimp plate, (A) ... article, (a) ... step, (B) ... packaging material, ( C) ... Package, (d) ... void,
(E), (F), (G ₁ ), (G ₂ ) ... Cutting blade.

Claims (8)

[Claims] 1. When opening a package (C) in which a large number of articles (A) having steps (a) are stacked and the outer side of which is packaged with a packaging material (B) in one package, the steps (a) ) A cutting blade (E) is actuated toward the space (d) between the article (A) and the packaging material (B) in the portion to cut the packaging material (B) in the portion and the cut surface. A method for opening a package in which articles having steps are accumulated, wherein the packaging material (B) is cut in a direction orthogonal to the cutting direction on three consecutive surfaces including 2. The cutting in the direction orthogonal to the cutting direction is performed on both sides of the three surfaces including the surface cut by the cutting toward the void (d). Item 10. A method for opening a package in which articles having steps according to the item are accumulated. 3. A step (a) which is parallel to the conveying direction of a package (C) in which a large number of articles (A) having a step (a) are stacked and the outer side of which is wrapped with a packaging material (B). ) Part, the cutting blade (E) acting toward the void (d) between the article (A) and the packaging material (B), and the three surfaces including the surface cut by the cutting blade (E) A cutting blade (F) for cutting the packaging material (B) in a direction orthogonal to the cutting direction,
(G ₁ ) and (G ₂ ) are provided, and an opening device for a package in which articles having steps are accumulated. 4. A table (10) on which a package (C ') cut by a cutting blade (E) parallel to the conveying direction of the package is placed, and the above side is provided on the side of the table (10). A frame body (16) for advancing and retracting in the cutting direction of the packaging material cut by the cutting blade (E) is provided, and the three cutting blades (F), (G ₁ ) and (G ₂ ) are the other ones.
An opening of a package in which articles having steps are accumulated according to claim 3, wherein the packaging materials are arranged in a frame (16) so as to travel in a cutting direction of the packaging material cut by two cutting blades (E). apparatus. 5. An apparatus for opening a package in which articles having steps are stacked according to claim 4, wherein a frame (16) is arranged so as to face the stand (10). 6. Two frame bodies (16) provided to face each other,
A packaged product in which the stepped articles according to claim 5 are mounted, wherein a pressure bonding plate (27) for pressing an end surface of the packaged product (C ') on the table (10) is attached to the (16). Opening device. 7. A crimping plate (28), (28) for pressing two opposing surfaces other than the pressing surface by the crimping plates (27), (27) out of the four side surfaces of one package (C '). 7. A device for opening a package in which articles having steps are stacked according to claim 6, wherein the device is attached to a base (10) so as to be able to move back and forth. 8. Two crimping plates (27) for pressing two adjacent side surfaces out of the four side surfaces of one package (C '),
A package in which articles having steps are stacked according to claim 7, wherein two crimping plates (27), (28) that press two other side surfaces adjacent to (28) are made different in moving distance. Opening device.