JP2003276709A - Method and device for opening bag body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for opening a bag body to surely open the bag body by eliminating the close contact of superposed sheets of the bag body like vinyl or the like. <P>SOLUTION: At least the superposed sheets of the opening part of the bag body are pinched by a first and second members on both sides, and a flexible member arranged at the pinching face of the second member is pressed into a plurality of recessed parts formed on the pinched face of the first member in an elastically deformed manner via the superposed sheets of the bag body. This enables the superposed sheets of the bag body to be bent and deformed at a plurality of positions between a plurality of recessed parts and flexible members to cause a slip between the superposed sheets, eliminating the close contact of the superposed sheets and surely opening the opening portion by separating mutual superposed sheets of the opening portion from each other. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag opening method and an opening device for adsorbing and pulling apart a position opposite to an opening of a vinyl bag, for example, in a bag packing operation.

[0002]

2. Description of the Related Art Conventionally, in this type of opening device, suction contact portions are arranged to face each other so as to be movable toward and away from each other, and the flat contact surfaces of the suction contact portions communicate with the suction device. One or a plurality of suction holes are provided in each. The suction contact portions are moved closer to each other, and the film at the position opposite to the opening of the bag made of film, for example, is sandwiched and sucked.

That is, the film at the position opposite to the opening of the bag is sandwiched between the flat contact surfaces in a pressure contact state, and in this state, the film is adsorbed by the suction force generated in the suction hole, and further, this suction plate is used. By moving the contact part away from each other, the films adsorbed on the contact surfaces are separated from each other, and the opening of the bag body is widened.

[0004]

However, the conventional opening method using the opening device may not give a good suction force, and for example, the adhesion force due to moisture or static electricity is generated between the polymer films in the opening. In this case, the suction force cannot overcome this and the films cannot be separated from each other, and the opening of the bag may not be opened.

[0005] If the bag body in the close contact state cannot be properly opened by opening the bag body in this manner, the bag body will not be opened during the bag body opening step, and the apparatus will stop.
Occupancy rate decreases. In addition, there was a problem that people had to be attached at all times.

Therefore, an object of the present invention is to solve the above-mentioned problems in an automated bag opening device.
It is an object of the present invention to provide a bag body opening method and a bag opening device that can reliably open the bag body by eliminating the contact state of the polymerized sheet of the bag body.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method and an opening device for a bag body, particularly in a bagging operation using a vinyl bag, in which adhesion is likely to occur at the overlapping portion of the bag body. Is. The bag opening method of the present invention is
A method of opening an opening by eliminating a contact state of a polymerized sheet forming an opening of the bag, wherein the polymerized sheet in at least the opening of the bag is narrowed from both sides by a first member and a second member. While pressing, the flexible member arranged on the narrow surface of the second member is press-fitted into the plurality of recesses formed on the narrow surface of the first member in an elastically deformed state through the polymerized sheet of the bag, The overlapped sheet of the bag body is curved and deformed at a plurality of positions between the plurality of recesses and the flexible member, whereby sliding is caused between the overlapped sheets of the curved state of at least the opening portion, and the overlapped state of the overlapped sheet is improved. It is characterized in that the opening is opened by removing the overlapped sheets and then separating the overlapping sheets from each other.

Further, the bag opening device of the present invention is a bag opening device for opening the opening after the superposed sheet forming the opening of the bag is narrowed by the narrowing mechanism to eliminate the close contact. is there. The narrowing mechanism provided in at least one set or a plurality of sets is provided with a first member and a second member that can approach and separate from each other in order to narrow the overlapped sheet at least in the opening of the bag body from both sides, At the time of narrow pressure, the flexible member arranged on the narrow pressure surface of the second member is press-fitted into the plurality of recesses formed on the narrow pressure surface of the first member in an elastically deformed state through the polymerized sheet of the bag body. The plurality of recesses and the flexible member are arranged at opposing positions.

Further, the bag opening device has a suction function of sucking one side surface of the bag from a stocker in which a plurality of bags are stacked, and the bag sucked by the suction function to the narrowing mechanism. A mechanism for taking out and moving the bag body to be moved, the narrowing mechanism for narrowing the overlapped sheet in at least the opening portion of the bag body from both sides, and a means for opening the opening portion by separating the overlapped sheets in the opening portion of the bag body from each other. And a chuck mechanism having a.

Further, the take-out moving mechanism for adsorbing one side surface of the bag body to hold the bag body is such that the opening portion of the bag body faces downward during the narrow pressure operation of the bag body by the narrow pressure mechanism. May be configured to be hung and held.

Further, the plurality of recesses formed on the narrowing surface of the first member may be formed by the uneven portions of the wire mesh provided on the narrowing surface of the first member.

Further, the flexible member arranged on the narrow surface of the second member may be a sponge which is a porous elastic member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a bag opening method and opening device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view for explaining the outline of the main structure of an automated bag opening device according to the present invention, and FIG. 2 is a schematic view of the bag opening device seen from above. Figure 3
4 is a schematic view of the bag opening device seen from the front, FIG.
Is a schematic view seen from the right side. Reference numeral 1 denotes a stocker 1 that stores a large number of bags 2, and a plurality of stackers are stacked in a stocker magazine 19 shown in FIGS. For the sake of simplicity in FIGS. 1 and 4, the stocker magazine is omitted,
The stocker at the top of the stocker magazine is described as stocker 1. Above the stocker 1,
Vacuum 3 which is a suction means for sucking one side surface of the bag body 2.
A take-out moving mechanism 4 having a tip is provided. The take-out moving mechanism 4 moves the bag body 2 to the vacuum 3 at its tip.
Since it is moved to the narrow pressure mechanism 7 while being adsorbed and held at, it is possible to rotate 90 degrees from the lower side to the upper side in front of the apparatus with the take-out rotation center 4a as an axis.

A narrow pressure mechanism 7 and a chuck mechanism 8 are provided in front of the take-out moving mechanism 4. The narrowing mechanism 7 includes a first member 10 and a second member 20 for narrowing the overlapping sheets around the opening of the bag body 2 from both sides. The first member 10 and the second member 20 are provided at the tip portions of both side surfaces of the air chuck 9, respectively, and the power is obtained from the air chuck 9 so that the first member 10 and the second member 20 work together. Driven. The wire mesh 5 is provided on the narrow surface 12 of the first member 10 and the sponge 6 is provided on the narrow surface 22 of the second member 20 so as to face each other. FIG. 9 is an enlarged view of the mesh portion of the wire net 5. The metal net 5 is composed of convex portions 18 forming a mesh and a plurality of concave portions 37 partitioned by the convex portions 18 to form a space. The sponge 6 is flexible enough to be pressed into the plurality of recesses 37 formed by the wire netting 6 in an elastically deformed state via the polymerized sheet of the bag body 2 when the bag body 2 is compressed.

The chuck mechanism 8 comprises two arms 14, 1
4 for receiving the bag body 2 after the operation of the narrow pressure, inside the two arms 14 contacting the side surfaces of the bag body,
Each vacuum 13 is provided. Here, three vacuums 13 are provided. The operation will be described in detail later with reference to FIG. 5 for explaining the movement of the chuck mechanism 8 after the movement, but the chuck mechanism 8 can be moved in the vertical direction to receive the bag body 2, and as shown in FIG. Since the second opening 2a faces upward, the chuck rotation center 8a can be rotated 180 degrees in front of the apparatus. Furthermore, it is possible to move to the left while holding the bag body 2.

Further, as shown mainly in FIG.
A take-out mechanism including a stocker 1 and a stocker magazine 19 for supplying the gas, a narrow pressure mechanism 7 and a chuck mechanism 8
The opening mechanism constituted by is fixedly attached to the base surface 11 with the base surface 11 as a boundary. Although not shown in detail, 15 on the take-out mechanism side is 1
This is an empty box collection mechanism that collects empty bag empty boxes that are used for packing all the bags 2 in one stocker.

Next, a series of operations of the bag opening device having the above structure will be described. As shown in FIG. 4, first, the uppermost stocker 1 filled with the bag body 2 is taken out and moved by the moving mechanism 4.
Is installed below. At this time, the bag body 2 is filled so that its opening is located on the rear side of the apparatus. Vacuum 3 which is a suction unit provided below the take-out moving mechanism 4.
By this suction, one side surface of the uppermost bag body 2 accommodated in the stocker 1 is sucked by the vacuum 3 and held by the vacuum 3. Then, the take-out moving mechanism 4
While the bag body 2 filled in the stocker 1 is taken out and held by suction, as shown mainly in FIG. 1 or FIG. Rotate. Thus, the bag body 2 is moved to the narrow pressure mechanism 7 as shown by the broken line in FIG. After the rotational movement, the opening 2a of the bag body 2 is located below.

Subsequently, as shown by a broken line in FIG. 3, the narrowing mechanism 7 moves rightward in the drawing by a distance L2. When the narrowing mechanism 7 moves to the position shown by the broken line, the bag body 2 is located in the space between the first member 10 and the second member 20 (although not particularly shown). The bag 2 is narrowed by the pressure mechanism 7 to eliminate the close contact state of the superposed sheets.

The procedure of the narrow pressure operation is as follows. First, the bag body 2 is moved to the first member 1 by the air pressure of the air chuck 9 shown in FIG.
It is sandwiched between 0 and the second member 20. At this time, both surfaces of the wire net 5 and the sponge 6 respectively provided on the narrow pressure surfaces of the first and second members are in pressure contact with the bag body 2 sandwiched from both side surfaces.
FIG. 6 is an image diagram when the narrowing mechanism 7 narrows the bag body 2, and FIG. 7 is a diagram illustrating deformation of the bag body 2 during the narrowing operation. FIG. 7 (a) shows a state just before the bag 2 is compressed, FIG. 7 (b) shows the compressed state, and FIG. 7 (c) shows an enlarged state in which the polymerized sheet 16 is locally formed into a curved shape. ing. In (c), 16 is each polymerized sheet, and a and b show the elongation of each sheet at the time of narrow pressure. As shown in FIG. 7, when the pressure is narrowed, the flexible sponge 6 is elastically deformed to form a plurality of recesses 3 formed by the wire mesh 5.
It is pressed into 7. The bag 2 sandwiched between the wire net 5 and the sponge 6 has a boundary between the convex portion 18 and the concave portion 37 of the wire net 5 (FIG. 7B).
(Points m and n) shown in FIG. 2 and the bag body 2 is locally formed into a curved shape within the range of the locked plural positions. As a result, as shown in FIG. 7 (c), one of the superposed sheets 16 forming the curved outer circumference tends to form a larger outer circumference as the narrow pressure advances (elongation a), while the inner circumference is expanded. The other polymerized sheet formed acts to shrink (elongation b). That is, there is a difference in elongation a and b between the two superposed sheets 16 and 16, and this difference causes slippage between the superposed sheets before the bag body 2 is broken. If slippage is caused in this way and the contact state between the polymerized sheets is eliminated in advance, the polymerized sheet 1
In the subsequent operation of separating the 6 from each other by suction or the like, the opening of the bag body 2 can be surely opened.

After the operation of narrowing the bag body 2 by the first member 10 and the second member 20 is completed, the first member 10
The second member 20 moves away from the bag body 2 facing each other, and the narrow pressure mechanism 7 retracts to the original position shown by the solid line in FIG. 3 (from the position shown by the broken line of the narrow pressure mechanism 7 in FIG. 3 to the solid line). Move left to the position indicated by.

Next, as shown in FIGS. 3 and 4, the chuck mechanism 8 moves up to receive the bag body 2 which has completed the operation of narrowing the pressure. L1 shown in FIG. 3 is the lifting distance of the chuck mechanism 8. The chuck mechanism 8 raised to the position of the bag body 2 moves its two arms 14, 14 closer to the bag body 2 and contacts the side surface of the bag body inside the two arms 14, 14 to receive the bag body 2. . At this time, the suction force of the vacuums 13 provided on the arms 14 may be used, or the bag 2 may be held by pressing the vacuums 13 at the facing positions without suction. Figure 5
It is a figure explaining movement of chuck mechanism 8 after chuck mechanism 8 goes up and receives bag body 2. As shown in FIG. 5, the chuck mechanism 8 that has received the bag body 2 rotates 180 degrees in front of the apparatus about the chuck rotation center 8a as an axis, and the opening 2a of the bag body 2 is turned up. Then, the chuck mechanism 8
Moves to the left while keeping the state in which the opening 2a of the bag body 2 is up. When the respective superposed sheets are moved to a predetermined opening position where they are separated from each other and opened, the vacuum 1 arranged inside the arm 14 sandwiching the bag body 2
The two superposed sheets are respectively adsorbed by the suction force of 3, and the adsorbed arms 14 and 14 are further moved away from each other, whereby the sheets are separated from each other, and the bag body 2 is opened to a desired size in which the filling can be put. At this time, since the opening 2a of the bag body 2 is positioned upward, the packaged product can be loaded from above.

The product to be packed is, for example, a small product such as a washer, and the product is packed by dropping the small product from above while the bag body 2 is widely held by the arm 14. Be seen.

In the present embodiment, the concave portion of the first member 10 and the flexible member of the second member 20 are connected to the wire mesh 5 and the sponge 6, respectively.
The member is formed on the entire narrow pressure surface, but it is sufficient if the effect of peeling the adhesion of the polymerized sheet of the bag and then opening the periphery of the opening by suction can be obtained. The wire mesh 5 and the sponge 6 may be formed on a part of the narrow surface of the range or a plurality of divided ranges, respectively. At that time, it is preferable that the wire net 5 and the sponge 6 formed on a portion having the narrow surface are provided so that when the bag body 2 is sandwiched, the formed portions face each other with the bag body 2 interposed therebetween. Of course, if the entire narrow pressure surface is formed by the wire mesh 5 and the sponge 6, the operation is performed over a wider area, and the close contact state of the polymerized sheet of the bag body 2 can be more reliably eliminated.

Further, although the sponge 6 is used as the flexible member arranged on the second member 20 here, the first member 1
When the bag 2 is squeezed by 0 and the second member 20,
Of the wire mesh 5 formed in the member 10 may be flexible enough to be press-fitted in an elastically deformed state.
Nothing is limited to sponges alone. Similarly,
Here, the plurality of recesses formed in the first member 10 are formed in the metal net 5
However, it may be a mesh-like one or a lattice-like one having a certain depth so that a predetermined bite of the flexible member can be obtained in correspondence with the flexible member of the second member 20. It is not limited to wire mesh only. Regarding the mesh shape of the wire mesh, a diamond wire mesh in which the mesh is knitted in a diamond shape is used in the embodiment, but it may be a hexagonal shape or various other modifications. FIG. 8 shows an example of the shape of a member that substitutes for the wire net 5. 17, 27 are concave portions, 3
Reference numerals 6 and 26 are contact portions with the bag body 2. If formed in this way, the flexible member bites into the recesses 17 and 27 when the bag 2 is under a narrow pressure, and the same effect as described above can be obtained.

Further, in this embodiment, the first member 10 and the second member 20 of the narrowing mechanism 7 are provided so as to spread outward from the air chuck 9, but as shown in FIG. The first member 10 and the second member 20 may be provided in parallel with each other, and a power source that can approach each other may be provided.

Although the present invention has been described above based on the embodiments shown in the drawings, various other modifications are possible within the scope of the present invention.

[0028]

As described above, according to the bag opening method and the bag opening device of the present invention, the bag can be surely opened. In particular, when a vinyl bag or the like has an adhesive force due to moisture or static electricity, it is often impossible to open the bag by the conventional suction-only operation. In that respect, in the present invention, the process of eliminating the adhesion state of the polymerized sheet by utilizing the slip generated between the polymerized sheets of the bag by the narrowing mechanism,
A more reliable opening is possible by performing the opening operation directly by suction or the like.

Further, if the bag opening device is constructed so as to suspend and support the bag by means of the take-out moving mechanism having a suction function, the bag can be supported at a single point without providing any special supporting means. It becomes easy to narrow the pressure.

Further, if a wire net is adopted as the concave portion of the narrow surface of the first member, the net portion of the wire mesh becomes a convex portion, and the hole portion, that is, the hollow portion functions as a concave portion. If the wire mesh is attached to the surface of the narrow pressure surface, it is possible to easily form a surface having a plurality of recesses and it is also inexpensive. It is also easy to replace only the wire mesh part with a replaceable type.

Furthermore, if a sponge is used as the soft member on the narrow surface of the second member, a part of the sponge will be formed in the concave portion formed by, for example, the wire mesh of the first member due to the appropriate elastic deformability of the sponge. It is possible to press-fit in an elastically deformed state and form a desired curved deformation in the bag body that is compressed. For example, it may be combined with the above-mentioned wire mesh, and a sponge can be easily configured as a flexible member, and the present invention can be implemented at low cost.

As described above, according to the present invention, the reliable opening of the bag body is automatically performed, and in various fields,
It can be used as a mechanized effective bag opening method and opening device.

[Brief description of drawings]

FIG. 1 is an overall perspective view illustrating the main configuration of a bag opening device that is an embodiment of the present invention.

FIG. 2 is a schematic view of a bag opening device according to an embodiment of the present invention as viewed from above.

FIG. 3 is a schematic view of a bag opening device according to an embodiment of the present invention as viewed from the front.

FIG. 4 is a schematic view of a bag opening device according to an embodiment of the present invention as viewed from the right side.

FIG. 5 is a view for explaining the movement of the chuck mechanism after receiving the bag body.

FIG. 6 is an image diagram illustrating a narrow pressure operation.

FIG. 7 is a diagram for explaining the deformation of the bag during the narrow pressure operation.

FIG. 8 is a diagram showing another embodiment of a mesh surface formed on the narrow pressure surface.

FIG. 9 is an enlarged view of a mesh portion of the wire mesh.

[Explanation of symbols]

10 First member 20 Second member 1 Stocker 2 bags 2a Bag opening 3,13 Vacuum 4 Removal movement mechanism 5 wire mesh 6 sponge 7 Narrow pressure mechanism 8 Chuck mechanism 9 Air chuck 11 base wall 12,22 Narrow pressure surface 14 arms 15 Empty box collection mechanism 16 Polymerized sheet 26, 36 contact part 17, 27, 37 Recess 18 convex 19 Stocker Magazine

Claims (6)

[Claims] 1. A method for removing an adhesion state of a polymerized sheet forming an opening of a bag to open the opening, wherein the polymerized sheet of at least the opening of the bag is provided with a first member and a second member from both sides. The pressure is narrowed by the member of
The plurality of concave portions formed on the narrow pressure surface of the member, the flexible member arranged on the narrow pressure surface of the second member is press-fitted in an elastically deformed state through the polymerized sheet of the bag body to thereby form the plurality of concave portions. The polymerized sheet of the bag body is curved and deformed at a plurality of positions between the flexible member and at least the individual polymerized sheets in the curved state of the openings to cause slippage, thereby eliminating the adhered state of the polymerized sheet, and thereafter. A method for opening a bag, comprising opening the openings by separating the overlapping sheets of the openings from each other. 2. A bag opening device for opening the opening after the superposed sheet forming the opening of the bag is narrowed by a narrowing mechanism to eliminate the close contact state, and at least one set or a plurality of sets are provided. The narrowing mechanism is
At least a first member and a second member capable of approaching and separating from each other are provided for narrowing the overlapped sheet in the opening of the bag body from both sides, and at the time of narrowing pressure, the first member and the second member are formed on the narrowing surface of the first member. The plurality of recesses and the flexible member are arranged at opposed positions so that the flexible member arranged on the narrow surface of the second member is press-fitted into the plurality of recesses in an elastically deformed state via the overlapping sheet of the bag body. An opening device for a bag body characterized by the following. 3. A take-out movement of a bag body having a suction function of adsorbing one side surface of the bag body from a stocker in which a large number of bag bodies are stacked and moving the bag body adsorbed by the suction function to the narrow pressure mechanism. A mechanism, a narrowing mechanism for narrowing the overlapped sheet in at least the opening of the bag from both sides, and a chuck mechanism having means for opening the opening by separating the overlapped sheets in the opening of the bag from each other, The bag opening device according to claim 2, further comprising: 4. The bag moving body for holding the bag body by adsorbing one side surface of the bag body, the bag body with the opening of the bag body facing downward during the operation of narrowing the bag body by the narrowing mechanism. The bag opening device according to claim 3, wherein the bag is held by hanging. 5. The plurality of recesses formed on the narrowing surface of the first member are formed by uneven portions of a wire mesh provided on the narrowing surface of the first member. The bag opening device according to any one of 1. 6. The bag according to claim 2, wherein the flexible member arranged on the narrow surface of the second member is a sponge which is a porous elastic member. Body opening device.