JPH057246B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a packaging method and an apparatus thereof, in which a single flat bag made of synthetic resin film or a flat bag portion 1 with one side of the film 2 are successively connected in the longitudinal direction, and the film 3 on the other side is a flat film in which an opening 5 is formed by cutting in the transverse direction just below the bottom seal 4 of each bag part. The present invention relates to a method and apparatus for sequentially expanding the openings 5 of each bag section 1 of a continuous bag band A (see FIG. 6) prior to loading the article to be packaged.

[Conventional technology]

Conventionally, among this type of bags, the continuous bag strip A has been widely used in packaging devices, and this continuous bag strip A is supplied to the packaging device, and the state of the continuous bag strip A when the article to be packaged is put into the packaging device is the same as that of a kangaroo. Because the condition is similar to that of a belly bag, it is commonly called a kangaroo bag. Conventionally, a pair of gripping type conveyors 6 are used to intermittently send out each bag size, and on the conveyor's delivery side, the continuous bag belt A is Let the bag part 1 at the tip of the bag hang down, and blow air downward from above with a blower.
Air is blown into the bag 1 through the opening 5 of the bag 1, the bag 1 is impregnated by the blowing air, and the opening 5 is expanded.

However, when the opening 5 of the bag portion 1 is expanded by a blowing wind, if the front and back films 2 and 3 are blocking, it is difficult to open the opening 5 only by the force of the blowing wind. Even after being expanded, the opening 5 of the bag portion 1 vibrates due to the blowing wind, and this tendency is particularly strong as the film constituting the continuous bag band A is thinner, and the opening 5 is insufficiently expanded. This may result in insufficient loading of the items to be packaged, or it may become difficult or impossible for young people to do so.

[Problem to be solved]

The present invention fundamentally improves the known method and apparatus as described above, by grasping the vicinity of the opening of each pouch, and
By expanding the opening using mechanical methods and means, even if the film on the front and back sides of the bag part is blocked, it can be surely expanded and the film band can be stabilized even after opening. The purpose is to

[Means to solve the problem]

In this invention, a convex ridge line is provided in the depth direction of the bag in the vicinity of the opening of a flat bag made of synthetic resin film in a part of the bag part of the continuous bag band, or one of the single bags. While pressing the bag from one side with the back support member and pressing the bag against the inclined surfaces on both sides of the central convex peak of the back support member using the pair of grip members from the other side of the bag, the pair of grip members The method of enlarging the opening of the bag consists of moving the two gripping members closer to each other to grip only the film on the gripping side of the bag, and then, in this state, moving the pair of gripping members away from the back support member.

In another invention, each bag is continuous in the longitudinal direction by a film on one side, and a pair of continuous bag bands made of synthetic resin film are fed out by sandwiching a continuous bag band made of a synthetic resin film, each having an opening in the transverse direction in the other film. A clamping type intermittent drive conveyor is provided, and a device for widening the opening of the continuous bag band hanging down on the discharge side, wherein the device for widening the opening is configured to spread the continuous film side of the continuous band. A back support member having a convex shape in the center of the plane and having a convex peak in the vertical direction at a position where it can come into contact with and separate from it, and sloped elevations on both sides is moved from outside the continuous bag band hanging position to the hanging position every time the conveyor stops. The gripping means is provided on the opposite side of the hanging continuous bag belt, and the gripping means is configured to be capable of opening and closing in the horizontal direction by means of an opening/closing drive means. The parts are
The movable support base is mounted on the machine frame so as to be able to move toward and away from the back support member by means of a driving means, and the pair of gripping members are mounted on the back support member. The pair of gripping means is configured to be able to come into contact with the inclined surface of the back surface, and in conjunction with the movement of the back support member toward and away from the rear support member, the pair of gripping means approaches the back surface support member together with the movable support member, and the gripping means moves toward the back surface of the back surface pressing member. After coming into contact with the surface, the gripping means move from a state where they are separated from each other, approach each other at the central convex peak position, come into pressure contact with each other, and separate from the back support member together with the movable support base, and the rear pair of gripping means are controlled so that they separate from each other. A device for expanding the opening of a bag, characterized in that the device is equipped with a section.

[Effect]

The operation of the device invention will be explained.

First, the back support member is separated from the path of the continuous bag band, and the pair of grip members are separated from each other left and right by the opening/closing means, and the movable support base supporting them is separated from each other by the separating means. The hanging position of the continuous bag band is separated from the back support member.

In this state, the continuous bag band is sent out by the conveyor for the length of one bag, and a position slightly below the opening at the tip thereof is located between the back support member and the pair of gripping members. At this time, the film in which the continuous bag band is continuous becomes the back support member side.

Next, the back support member moves forward from the retreated position, and the convex peak moves forward to the continuous bag band position, and the movable support base advances toward the back support member by the approaching/separating drive means, and the pair of gripping members , abuts on the sloped surface across the central convex peak via a continuous band.

Next, by the opening/closing driving means, the pair of gripping members approach the inclined surface of the back support member while pressing the edge of the bag portion of the continuous bag band.

At this time, the film that comes into contact with the inclined surface of the back support member stops in place due to the friction of the inclined surface, and only the film on the side that contacts the gripping member is brought together with the gripping member by this friction to the central convex peak and becomes flat. As seen, a loop is formed, and this loop is held between the pair of gripping members.

Next, the movable support base is returned to its original position by the contact/separation driving means, and at the same time, the back support member is also returned to its original position.

In this way, only the film on one side of the bag portion of the continuous bag band is held between the pair of holding members and pulled, so that the film is spread over the bag portion.

When this device is incorporated into a part of a packaging device, in this state, air or the like is blown into the bag portion and the object to be packaged is inserted or filled.

Finally, the pair of gripping members are separated by the opening/closing drive means and returned to their original positions.

Next, the conveyor is driven to transport the edges of the two bags filled with the items to be packaged to the position of the opening sealing device.

This action is repeated thereafter.

In other words, the method invention of this application is implemented repeatedly.

The invention will now be explained on the basis of a representative embodiment of the illustrated device.

〔Example〕

A description will be given based on a typical embodiment of the second invention shown in FIGS. 1 to 5.

In the figure, for the continuous bag band A and a pair of clamping type conveyors 6 for intermittently transporting the continuous bag band A over the length of one bag section 1, suitable known ones are used.

10 is a back support means, and the conveyor 6
Each bag part 1 of the continuous bag belt A hanging down from the unloading side of the machine is provided on the side of the continuous film 2, and the machine frame 4
A back support member 15 is fixed to the piston 13 and piston rod 14, which are movable members of the first air cylinder device 11, which are fixed at 0, and the movable direction of the back support member 15 is the same as the film of the continuous bag band A hanging down. The rear support member 15 is provided horizontally in a direction perpendicular to the plane, and the overall shape of the back support member 15 is a mountain shape with a convex center when viewed from the plane, and a convex peak 16 is provided in the center in the vertical direction. An inclined surface 17 inclined with respect to the direction of movement of the back support member 15
In the supporting member 15, at least the surface layer of the central convex ridge 16 and the inclined surfaces 17 on both sides thereof are formed of synthetic rubber having a large coefficient of friction and some elasticity. In other words, convex peak 1
The ridge line 6 is in the depth direction of the bag.

The planar shape of the back support member 15 may be a semicircular arc shape as shown in FIG. 9, but this invention is still the same.

20 is a gripping means, and the back support means 10
and are placed facing each other with a continuous bag band A in between,
The pair of grip members 21 are each provided on a movable support base 22 supported by the machine frame 40, and the pair of grip members 21 are provided so as to be able to move toward and away from each other on the movable support base 22, and When the movable support base 22 and the back support member 15 are brought close to each other, the pair of gripping members 21 are provided at positions that contact the inclined surface 17 of the back support member 15. In the illustrated example, the pair of grip members 21 are made of synthetic rubber and have a small circular shape with an axis in the vertical direction, but the shape is not particularly limited. The gripping member 21 is fixed to a movable support base 22 with its fulcrum being fixed to the tip end 25 of a bell crank 24 supported by a vertical shaft 23;
At the rear end 26 of each bell crank 24, a second opening/closing driving means, which is a type of opening/closing drive means, is fixed to the movable support base 22 via links 27 of equal length.
Piston 2 as a movable member of air cylinder device 28
The gripping members 21 are connected to a piston rod 30 integral with the piston 9, and as the piston 29 moves, the pair of gripping members 21 can come into contact with each other and separate from each other.
The movable support base 22 is integrated with a piston 32 and a piston rod 33, which are movable members of a third air cylinder device 31, which is a type of contact/separation driving means fixed to the machine frame 40.

In addition, in the figure, 18 is a first air control valve that takes air in and out of the first air cylinder device 12, 34 is a second air control valve that takes air in and out of the second air cylinder device 28, and 35 is a third air cylinder device 31. The first, second and third air control valves 18, 34, and 35 are the third air control valves for inlet and outflow of air, and the generally known two-position or three-position operating solenoid valves are used. 36 is an air pipe connecting these with a pressure air source 42. Reference numeral 41 denotes a control section for causing the first, second, and third air control valves 18, 34, and 35, the conveyor 6, and other operating sections to operate as desired.

[Examples of method inventions and effects of device inventions]

Next, examples of the method invention will be specifically explained together with the effects of the above-mentioned apparatus invention.

First, the back support member 15 is moved away from the path of the continuous bag band A by the first air cylinder device 11, and the pair of gripping members 21 are moved away from each other left and right by the second air cylinder device 28, and these The movable support base 22 supporting the continuous bag belt A is moved away from the hanging position of the continuous bag belt A in a direction opposite to the back support member 15 by the third air cylinder device 31 (the second (see figure).

In this state, the continuous bag band A is sent out by the conveyor 6 for the length of one bag part 1, and the tip of the continuous bag band A is placed between the back support member 15 and the pair of gripping members 21 at a position slightly below the opening 5 of the bag part 1. Located in At this time, the film 2 on the continuous side of the continuous bag band A becomes the back support member 15 side.

Next, to explain using the illustrated example, the first air control valve 18
The piston 13, the piston rod 14, and the back support member 15 are moved in the direction of the continuous bag band A, and air is sent into the right chamber 12a of the cylinder 12 in the first air cylinder device 11. The convex peak 16 is advanced to a position where it contacts the continuous bag band A.

Further, in synchronization with the operation of the back support means 10,
Air is sent into the right chamber 32a of the piston 32 of the third air cylinder device 31 by switching the third air control valve 35, and the piston 32, the piston rod 33, the movable support base 22, and all the components installed thereon are fed. The member is advanced in the direction of the back support member 15, and the pair of gripping members 21 are pressed against the opposing left and right inclined surfaces 17 of the back support member 15 via the continuous bag band A.

In this way, the continuous bag band A of the portion held between the back support member 15 and the pair of gripping members 21
is bent into a chevron shape when viewed from above along the convex peak 16 of the back support member 15 and the inclined surfaces 17 on both sides thereof (see FIG. 3).

Then, while the continuous bag band A is being held between the back support member 15 and the pair of gripping members 21, the second air control valve 34 is operated to supply air to the left chamber 29a of the second air cylinder 28. The piston 29 and the piston rod 30 are moved, and the pair of links 27 and the bell crank 24 are moved.
is activated to bring the pair of gripping members 21 close to each other.

In this way, one film 2 of the continuous bag band A remains in close contact with the inclined surface 17 of the back support member 15, and the film 3 on the other side, that is, the side that is in contact with the gripping member 21, remains in that position. Due to the frictional force with the gripping members 21, they are brought together to the center, and the center part separates from the film 2, gradually forming a loop portion 6 between the pair of gripping members 21, and finally the pair of gripping members 21 Niko loop part 6
is clamped (see Figure 4).

Next, the third air control valve 35 is reversed again to send air into the right side chamber 32b of the third air cylinder device 31, and the piston 32, piston rod 33, movable support base 22, and the pair of gripping members 21 are moved to one side of the continuous bag belt A. The film 3 is separated from the back support member 15 while holding the loop 6 near the opening 5 of the film 3.

On the other hand, simultaneously with the above operation, the first air control valve 18 is reversed again, and the first air cylinder device 1
Air is sent into the left chamber 12b of piston 1.
3. Back support member 15 along with piston rod 14
(see Figure 5).

In this way, the opening 5 of the bag portion 1 of the continuous bag band A is expanded as shown in FIG.

For example, when this device is used as a part of a packaging device, the opening 5 is opened in the bag portion 1 in this state.
After inserting or filling the object to be packaged, the second air control valve 28 is reversed, air is fed into the right chamber 29b of the second air cylinder device 28, the piston 29 is moved to the left, and the piston rod 30 and the pair of links 27 are moved. By pulling the bell crank 24, the pair of gripping members 21 are separated from each other and returned to the state shown in FIG. 2.

Next, the conveyor 6 is driven to convey the position of the opening 5 of the bag portion 1 of the continuous bag band A into which the article to be packaged has been filled or inserted to the position of an opening sealing device (not shown).

Repeat this operation below.

In the above example, an air cylinder device was used as the drive source for the back support means 10 and the gripping means 20, but the present invention would be the same even if a solenoid, linear motor, etc. were used instead. be.

Furthermore, in the illustrated example, explanation has been given of expanding the opening 5 of the bag section 1 that is connected to a part of the continuous bag band A, but it is also possible to supply a single bag to the apparatus of the present invention and widen the opening. However, the method of this invention is the same.

Furthermore, even if the direction in which the bags or bag portions are fed is not vertical but horizontal as shown in FIG. 7, the present invention is the same; This invention is the same even if the sets are provided rotationally symmetrically.

In addition, the film 2 is held in the fifth position on both sides of the back support member 15 only when it is separated from the gripping member 21.
As illustrated in FIGS. 7 and 7, a method and apparatus for adsorption using a reduced pressure adsorption section 37 may be added.

In the above-described device invention, instructions for each sequential operation are generally performed by an electrical or electronic control section 41, and this control section may be a computer such as a one-chip computer.

[Effects of method invention]

Since the method is as described above, the opening 5 of each bag portion 1 of the continuous bag band A or the opening 5 of a single bag is securely gripped by the pair of gripping members 21 to securely grip one film of the bag. Therefore, even if the front and back films of the bag are blocking, first shift the front and back films in the width direction to introduce air between the front and back films, and then remove only the center of one film as a pair. Since the grip member 21 grips and pulls the opening 5, the opening 5 can be easily expanded and this state can be maintained, and the expanded state of the opening 5 is stable. be effective.

[Effects of embodiments of method invention]

This is a method of supplying a part of the bag section 1 of the continuous bag band A, in which the bag is supplied while hanging down in the vertical direction,
In an example in which the opening 5 is expanded from both sides of the bag 1 by the method described above, the film 2 on the side that contacts the back support member 15 is continuous with the adjacent bag (usually with discontinuous cuts 7 When the film 3 on the opposite side of the bag portion 1 is held between the pair of gripping members 21 and separated from the gripping members 21, the film 3 is reliably separated.

As shown in FIG. 7, the bag portion 1 of the continuous bag band A or a single bag is fed horizontally, and the bag portion 1 is provided with a back support member 15 on the lower side and a pair of gripping members 21 on the upper side. In the method in which the upper film 3 is grabbed and lifted from above and below, the lower film 2 remains in place due to its own weight, so that the opening 5 of the bag can be reliably expanded.

[Effects of device invention]

In this device invention which is configured and operates as described above, in addition to being able to carry out the method invention described above, the vicinity of the opening 5 of the bag is attached to the back support member 15 having the shape as described above from one side. While backing up, the pair of gripping members 21 approach each other while pressing the bag from the other side against the inclined surface 17 of the back support member 15. Only the film 3 in contact with these slides in the width direction of the bag and is brought to the center, making the loop 6
is formed, and this loop 6 is finally grabbed by the pair of gripping members 21. At this time, air enters between the films 2 and 3, the blocking of the two films is separated, and the pair of gripping members 21 grips the loop 6. 21, the opening 5 of the bag is reliably expanded because it is separated while gripping only one side of the film 3, and even in the expanded state, it is held in the gripped state, so that it is not possible to insert or fill the packaged items. The opening of the bag can also be stabilized inside.

[Effects of the Embodiments of the Apparatus Invention] When the planar convex shape of the back support member 15 is chevron-shaped, the loop 6 can be most effectively formed on the film 3 and can be easily gripped by the gripping member 21.

The surface layers of the back support member 15 and the pair of gripping members 21 are made of synthetic rubber and have some elasticity, so that when the surface has a large coefficient of friction, the films 2 and 3 of the bag cannot be crushed, and these Almost no slip occurs between the member and the film 2 or 3, and slip can be caused between the front and back films 2 and 3 of the bag, and there is no risk of failing to grip the film 3.

In addition, as shown in FIG. 7, in a device that horizontally supplies bags by providing a back support member 15 on the lower side and a pair of gripping members 21 on the upper side, a separate table 38 for supporting the bags is provided. In an example in which the bag is stabilized by the bag, the opening 5 is expanded in a stable state, and the reduced pressure adsorption section 37 is provided, the bag does not move erratically even when the object to be packaged is inserted into the bag.

As shown in the example shown in FIG. 8, when the device of the present invention is arranged rotationally symmetrically when viewed from above, both the films 2 and 3 on the front and back sides of the bag are gripped and pulled by a pair of gripping members 21, respectively. From this, the opening 5 of the bag can be expanded more reliably.

When the gripping member 21 has a circular shape, when a portion of the gripping member 21 becomes worn due to long-term use, the gripping member 21 can be moved around its axis and fixed again for use. The diameter of each gripping member 21 at this time is 10 to 20 mm.
degree is preferred.

[Brief explanation of drawings]

The drawings schematically show typical embodiments for carrying out the method of the present invention, and the first
The figure is a perspective view, FIGS. 2 to 5 are plan views showing the steps of the method using the above-mentioned apparatus, FIG. 6 is a partially vertical side view of the continuous bag belt supplied to the present invention, and FIG. 7 is the invention of the apparatus. FIG. 8 is a partial plan view showing still another embodiment, and FIG. 9 is a plan view of another embodiment of the back support member. Main symbols in the figure: A...Continuous bag band, 1...Bag part,
5...Opening, 6...Loop, 10...Back support means, 15...Back support member, 20...Gripping means, 21...Pair of gripping members.

Claims (1)

[Scope of Claims] 1. The ridgeline of the convex ridge extends in the depth direction of the bag in the vicinity of the opening of a flat bag made of synthetic resin film, which is one of the bag portions of the continuous bag band and one of the single bags. While pressing the bag from one side with a back support member provided on the back support member, and pressing the bag from the other side of the bag against the inclined surfaces on both sides of the central convex peak of the back support member using a pair of gripping members, Expanding the opening of the bag by moving a pair of gripping members closer to each other to grip only the film on the gripping side of the bag, and then, in this state, moving the pair of gripping members away from the back support member. Method. 2. The method of expanding the opening of a bag according to claim 1, characterized in that the bag is fed in a vertical direction and the back support member and the gripping member are moved toward and away from each other in a horizontal direction. 3. The bag according to claim 1, wherein the bag is fed in a horizontal direction, and the back support member is moved away from the bottom of the bag and the gripping member is moved away from the top of the bag. How to widen the opening. 4 A pair of clamping type intermittent devices that sandwich and feed continuous bag strips made of synthetic resin film, each of which is continuous in the longitudinal direction by a film on one side and has openings in the transverse direction in the other film. A driving conveyor is provided, and a device for expanding the opening of the continuous bag band hanging down on the discharge side, wherein the device for expanding the opening can approach and separate from the continuous film side of the continuous band. Each time the conveyor stops, a back support member having a convex shape in the longitudinal direction and having sloped elevations on both sides advances from outside the continuous bag band hanging position to the hanging position, and , is provided so as to be retractable, and a gripping means is provided on the opposite side of the hanging continuous bag belt, and this gripping means is provided with a pair of gripping members that open and close in the horizontal direction by an opening/closing drive means.
The movable support base is mounted on the machine frame so as to be able to move toward and away from the back support member by means of a driving means, and the pair of gripping members are mounted on the back support member. The pair of gripping means is configured to be able to come into contact with the inclined surface of the back surface, and in conjunction with the movement of the back support member toward and away from the rear support member, the pair of gripping means approaches the back surface support member together with the movable support member, and the gripping means moves toward the back surface of the back surface pressing member. After coming into contact with the surface, the gripping means move from a state where they are separated from each other, approach each other at the central convex peak position, come into pressure contact with each other, and separate from the back support member together with the movable support base, and the rear pair of gripping means are controlled so that they separate from each other. A device for expanding the opening of a bag, characterized in that it is equipped with a section. 5. The device for expanding the opening of a bag according to claim 4, wherein the planar convex shape of the back support member is a type of chevron-shaped semicircular arc shape. 6. The opening of the bag according to claim 4, wherein the surface layer of the back support member and the gripping member is made of synthetic rubber or the like and has some elasticity, and has a large surface friction coefficient. A device that expands the area.