JPH059287Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a folding bag opening device, and more specifically, to a folding bag opening device that opens the bag while destroying the adhesion of the inner surface of the bag. In particular, it can be suitably used for opening foldable bags having gussets.

(Prior art) Conventional technologies related to folding bag opening devices include Japanese Patent Publications No. 16717-1982 and Japanese Patent Publication No. 30729-1983.
Publication No. 61-19486, Japanese Patent Publication No. 1988-1948-
Those described in Japanese Utility Model Publication No. 187523 and Japanese Utility Model Publication No. 54-42854 are known.

To briefly explain the conventional technology described in the above publication, Japanese Patent Publication No. 50-16717 discloses that when opening a film, the distance between the gripping tools that has been widened once is narrowed, and then widened again. It describes what to do.

In addition, Japanese Patent Publication No. 57-30729 discloses a plate having a suction device that can press the bag and transfer it by suction, and a plate that is connected to the suction device and has a press plate that presses the bag and releases the bonded state of the mouth edge of the bag. It is described that the opening of the bag is opened by shifting the upper lip of the bag from the lower mouth edge of the bag toward the bottom of the bag by the action of a leaf spring.

Further, Japanese Patent Publication No. 19486/1986 describes that the transfer of the bag and the opening of the bag opening are carried out by a pair of endless suction belts.

Furthermore, JP-A No. 59-187523 describes that the opening of the bag opening is maintained by gripping claws that push the bottom and opening of the bag in directions perpendicular to the suction direction and facing each other. There is.

In addition, Japanese Utility Model Publication No. 54-42854 discloses a pair of suction cups that open the bag by suctioning both sides of the bag mouth, a pressurized air blowing pipe, and a pair of pressing plates that press the entire width of both sides of the bag mouth to close the bag. It is described that the development and shaping is performed by blowing pressurized air.

(Problems to be solved by the invention) However, the above-mentioned conventional technology had the following problems.

In other words, the opening method described in JP-B-50-16717 only narrows the gap between the gripping tools that has already been widened, and therefore the film is not sufficiently shaken loose, and although opening failures are only slightly reduced, there is a problem in that the opening ability is reduced.

Furthermore, since the bag feeding device described in Japanese Patent Publication No. 57-30729 holds only one side of the bag, it can be used without an opening for bags made of thick, rigid film, but for bags made of thin film, etc. In this case, since the inner surfaces of the films were in close contact with each other, the two films simply slipped toward the bottom of the bag while remaining in close contact with each other, and the mouth of the bag could not be opened.

In addition, the bag opening/closing device described in Japanese Patent Publication No. 19486/1986 is a suction belt type, so it cannot strongly suction the bag, and if two films are in close contact with each other, the bag opening/closing device will not open the bag opening. I didn't get it.

Further, the opening method described in Japanese Patent Application Laid-Open No. 59-187523 can be applied when the bag is rigid, but cannot be applied to a bag made of a thin film or the like.

Furthermore, the unfolding device described in Japanese Utility Model Publication No. 54-42854 does not have a mechanism for loosening the film, which results in opening defects, and requires closing the bag with a pair of pressing plates when unfolding the bag. Therefore, the structure is not only complicated, but also the opening ability is reduced by the operating time of the pressing plate pair.

Therefore, an object of the present invention is to provide a bag-opening device for a foldable bag that can reliably and efficiently open a foldable bag while destroying the adhesion of the inner surface of the bag. be.

(Means for Solving the Problems) The present invention provides: 1. A method for opening and closing a foldable bag, which includes a pair of suction devices having a suction section that sucks a foldable bag, and a suction device opening/closing device that opens and closes the suction devices. In the bag device, the mounting member to which at least one of the suction parts is attached can be freely deformed to narrow or widen the gap between the mounting member and the movable part in the opening/closing direction with respect to the movable part that is driven to open and close by the suction tool opening/closing device. In addition, the mounting member is attached via a link mechanism that moves perpendicularly to the opening/closing direction when the gap becomes narrower, and is provided with a biasing means for biasing the mounting member in a direction to widen the gap between the movable part and the mounting member. A foldable bag opening device featuring:

2. The foldable bag opening/closing device according to claim 1, wherein the link mechanism is a parallelogram link mechanism.

It is in.

(Function) In the present invention, after a bag is inserted into the space between a pair of suction parts placed in an expanded position, when the suction tool opening/closing device is operated in the closing direction, the pair of suction parts come close to each other. and touch the bag by pinching it. At this time, the attachment member of the suction part on the side with one link mechanism stops moving in the opening/closing direction, but when the suction device opening/closing device is further operated in the closing direction, the movable part on this side resists the urging means. The link mechanism is deformed to narrow the distance between the movable part and the attachment member, and the attachment member and the suction part attached thereto are moved at right angles to the opening/closing direction. By this movement of the suction part in the perpendicular direction, the suction part moves the surface of the bag it contacts in the perpendicular direction, thereby relatively shifting the front and back surfaces of the bag to facilitate opening of the bag.

(Example) Hereinafter, an example will be described in which the foldable bag opening device of the present invention is used as a foldable bag unfolding device shown in the drawings.

Fig. 1 is a front view showing an embodiment of the folding bag opening device of the present invention used in a folding bag unfolding device, Fig. 2 is a plan view thereof, and Fig. 3 is a left side view thereof. In these drawings, 1 is the pool conveyor 5
a sending device that separates the foldable bags 8 stacked on top one by one and supplies them onto the conveyor 2;
2 is a transport conveyor that supplies the foldable bags 8 one by one to the bag opening device 3 and holds the foldable bags 8 at a predetermined position; 3 is a bag opening device that sucks the vicinity of the mouth of the foldable bag 8 and opens it; 4 is an air blowing device that blows air into the opened foldable bag 8; 5 is a pool conveyor that supplies the foldable bag 8 to the bottom of the delivery device 1;
6 is a container transport conveyor that transports a container 9 that stores the foldable bag 8 that has been opened and unfolded;
The bag opening device 3 corresponds to an embodiment of the folding bag opening device of the present invention, and the folding bag unfolding device of the above embodiment using the folding bag opening device of the present invention is a stackable bag opening device of the present invention. This is a device for separating foldable bags 8 one by one and efficiently and reliably unfolding them into a rectangular tube shape. They are arranged randomly. In FIGS. 1 and 2, a part of the unfolding device for a set of foldable bags on the right side is omitted from illustration.

To explain each part in the embodiment in detail, the delivery device 1 includes a rotatable cylindrical delivery roller 11 having a large number of holes 11a around which the foldable bag 8 is adsorbed, and the delivery roller 11. a feed-out roller lifting device 12 for raising and lowering the feed-out roller; a feed-out roller driving device 13 for rotating the feed-out roller 11 when the feed-out roller 11 is in the raised position; Type bag 8-2
It is equipped with an auxiliary suction device 14 that prevents sheet feeding, and an auxiliary suction device elevating device 15 that raises and lowers the auxiliary suction device 14. As shown in FIG. 4, the delivery roller 11 is rotatably fitted to the outer circumferential surface of the inner tube 11b, and a number of holes 11a are formed on the circumferential surface for adsorbing the foldable bags 8. There is. The hole 11a
are arranged in three rows on the circumferential surface near both ends of the delivery roller 11. Further, the inner cylinder 11b is provided with one notch 11c on the circumferential surface near both ends, and the holes 11a are arranged so as to sequentially pass over the notches 11c as the delivery roller 11 rotates. ing. Note that the inner cylinder 11b is attached to the arm 1 of the delivery roller lifting device 12 with the notch 11c facing downward.
2a, and the feed roller 11 is rotated by a roller drive device 13 via pressing rollers 11d provided at both ends thereof.

Further, the delivery roller lifting device 12 includes an arm 12a on which the delivery roller 11 is fixedly installed, an air cylinder 12b, and a support shaft 12c.
a is the air cylinder 12b with the support shaft 12c as the fulcrum.
It is designed to be swayed by

Further, when the feed roller 11 is at the top dead center, the feed roller drive device 13 controls the feed roller 11.
The driving roller 13 that contacts the pressing roller 11d of
a and a motor 13b, and two driving rollers 13a are respectively disposed at positions corresponding to the pressing rollers 11d. Further, 13c is a conductive belt.

The auxiliary suction tool 14 has a cylindrical shape as shown in FIG. 5, has urethane rubber 14a pasted on its lower surface, and is configured to auxiliary suction the foldable bag 8 through suction holes 14b on the lower surface. It has been done.

Further, the auxiliary suction device elevating device 15 includes an air cylinder 15a directly connected to the auxiliary suction device 14.

Moreover, 16 is an air blowing nozzle for peeling off the foldable bag 8 attracted by the delivery roller 11 from the delivery roller 11, and two air blowing nozzles are provided. Note that instead of the air blowing nozzle 16, a vacuum chamber and a pressure chamber may be provided in the inner cylinder 11b of the delivery roller 11, and the collapsible bag 8 may be peeled off from the delivery roller 11 using compressed air.

Further, the conveyor 2 has a large number of intake holes 21a.
The present invention includes an endless belt 21 having an inner side, a decompression box 22 disposed inside the endless belt 21, and a nip roll 23 for holding the foldable bag 8 in a predetermined position. Endless belt 21 has 2 rows x many intake holes 2
1a is provided. Further, two elongated holes 22a are provided on the top surface of the decompression box 22, and the intake holes 21a are arranged so as to pass over the elongated holes 22a as the endless belt 21 rotates. Further, the nip roll 23 is pressed against the endless belt 21 by its own weight using the support shaft 23a as a fulcrum. Furthermore, 21b
23b is a motor with a brake for driving the endless belt 21, 23b is a motor for driving the nip roll 23, and 21c and 23c are transmission belts.

Further, the bag opening device 3 as a bag opening device for a foldable bag of the present invention includes a pair of suction tools 31 having a suction part 31a for sucking the foldable bag 8, and a suction device for opening and closing the suction devices 31. One suction tool 31 includes a link mechanism 31b and a biasing tool 31c that biases the link mechanism 31b. As shown in FIG. 6, each suction tool 31 includes three suction parts 31a, and the suction parts 31a each have three suction parts 31a.
Silicone rubber is pasted on the suction surface. or,
One suction tool 31 (on the right side in FIG. 6) includes a parallelogram-shaped link mechanism 31b, a biasing tool 31c made of an elastic body that biases the link mechanism, and a stopper 31d that restricts the operation of the link mechanism. and is provided. In this embodiment, the suction tool 31 equipped with the link mechanism 31b is connected to the suction tool opening/closing device 32.
However, the suction tool 31 that does not include the link mechanism 31b may be moved, or both suction tools 31 may be moved. Also, a link mechanism 31b in which both suction tools 31 are shifted in opposite directions.
It is also possible to have the following. Further, a coiled spring may be used as the urging member 31c.

In addition, the suction tool opening/closing device 32
1, and a guide rod 32b that guides the movement of the suction tool 31.

Further, the air blowing device 4 includes a blowing air nozzle 41 and four pressurized air nozzles 42 at a position facing the opening of the foldable bag 8. As shown in FIG. 7, pressurized air nozzle 4
2 are disposed at the four corners of the blowing air nozzle 41, and their tips are curved outward.
Moreover, the blowing air nozzle 41 is a rotary cylinder 41.
It is connected to a blower 41c via a rotary shutter 41b operated by a. Further, the pressurized air nozzle 42 is connected to an air compressor (not shown) via a valve (not shown). Note that the pressurized air nozzle 42 is omitted in FIG.

Further, the pool conveyor 5 includes an endless belt 51 having a partition wall 51a and a pillow 51b for shaking the bags 8, and a drive unit 52 that drives the endless belt 51. In addition, 51c is a foldable bag 8
This hole is made in the endless belt 51 to detect the presence or absence of the belt.

Further, the container transport conveyor 6 is preferably a roller conveyor, and is preferably provided with a suitable drive device and a suitable stopper for stopping the container 9 being transported.

Since the foldable bag unfolding device of the above embodiment is configured as described above, for example, as shown in FIG. Although it can be suitably used when it is unfolded into a shape and stored in a container 9 as shown in FIG. 9, it can also be applied to a foldable bag that does not have a gusset 81 or a handle 82. Note that 83 is a seal portion.

That is, the foldable bags 8 (hereinafter also referred to as bags) supplied in stacks of 100 to each compartment 53 partitioned by the partition wall 51a of the pool conveyor 5 are transported by the pool conveyor 5 as shown by arrows in FIG. direction, and stops below the delivery device 1. bag 8
are sent out one by one by the sending device 1, and when the bag 8 in the section 53 runs out, the endless belt 51
A reflective type photo switch (not shown) disposed between the driving pulley and the driven pulley detects the absence of the bag 8 and advances the endless belt 51 by one pitch. Further, a reflection plate (not shown) is provided on the extension of the line connecting the reflection type photo switch and the hole 51c. In order to be able to stop the endless belt 51 at a predetermined position with respect to the feeding device 1, it is preferable to provide a suitable endless belt position detection device (not shown).

The bags 8 fed below the delivery device 1 are separated one by one and fed onto the conveyor 2.
That is, first, the auxiliary suction tool 14 is lowered by the auxiliary suction tool lifting device 15. At the same time as the auxiliary suction tool 14 begins to descend, a vacuum generator (not shown) connected to the suction hole 14b via piping (not shown) also starts operating (the vacuum generator stops only when the auxiliary suction tool 14 is at the top dead center). ). At the same time, the delivery roller 11 is also lowered by the delivery roller lifting device 12. Note that a blower (not shown) connected to the inner cylinder 11b of the delivery roller 11 by a pipe (not shown) is always in operation. When the bag 8 is sucked by the lowered delivery roller 11 and the auxiliary suction tool 14, the delivery roller 11 and the auxiliary suction tool 14 rise. When the feed roller 11 reaches the top dead center, the pressing roller 11
d comes into contact with the constantly rotating drive roller 13a, and rotation is applied to the delivery roller 11. As the delivery roller 11 rotates, the bags 8 adsorbed by the delivery roller 11 are sequentially sucked into the hole 11a through the notch 11c of the inner cylinder 11b.
When a is removed from the notch 11c, the suction state is gradually released, and the air blown from the air blowing nozzle 16 separates the a from the delivery roller 11 and supplies it onto the conveyor 2. It should be noted that the auxiliary suction tool 14 reaches the top dead center slightly before the delivery roller 11 reaches the top dead center, and the bag is released from suction by the auxiliary suction tool 14, so that the bag is sucked and sent out. The bags 8 do not drag the bags 8 stacked below, and these bags 8
It has a shaking effect to break the close contact between the bag 8 and the bag 8 below. Also, the feed roller 1
1 is not operated by turning on or off the motor or clutch, but by pressing the feed roller 11 against the constantly rotating drive roller 13a, which may occur if the motor or clutch is turned on or off frequently. We were able to solve these problems such as lifespan. Also,
In this embodiment, air is always blown out from the air blowing nozzle 16, but it may be blown out only when the sending roller 11 is raised.

The bag 8 delivered onto the conveyor 2 is conveyed to a predetermined position by the endless belt 21 and then stopped. That is, the bag 8 is conveyed while being sucked through the suction hole 21a, hangs down through the nip roll 23, and is stopped at a position where the handle 82 of the bag 8 is held by the nip roll 23 using a reflective photo switch. Controlled by PH1 and PH2. Photo switches PH1 and PH2 are
At the predetermined position where the bag 8 is to be stopped, the photo switch PH1 is shielded from light by the bag 8, and the photo switch PH2 is placed in a position where the light is not shielded (see FIG. 8), and the bag 8 is placed at the predetermined position. When it is detected by the photo switches PH1 and PH2 that the bag 8 has been transported, the motor 21b with brake and the motor 23b are stopped, and the bag 8 is prepared for opening by the bag opening device 3. Incidentally, the motor 21b with brake and the motor 23b are operated again when the bag 8 is sucked by the suction tool 31 to prepare for transporting the next bag 8.
Furthermore, if the container 9 has not arrived at the predetermined position, the motor 21b with brake and the motor 23b are stopped when the photo switch PH1 is shielded from light, and the system waits until the container 9 arrives. The photo switch PH1 is placed at a position slightly above the top surface of the container 9 being conveyed on the container conveyor 6, and the photo switch PH2 is placed at a position slightly above the top surface of the container 9 being conveyed on the container conveyor 6.
It is preferable to arrange it at a position slightly above.

The bag 8 transported between the pair of suction tools 31 of the bag opening device 3 in the above embodiment as a foldable bag opening device of the present invention is sucked near the mouth edge located at the bottom of the handle 82. The bag is designed to be opened.
That is, a pair of suction devices 31 are closed by the suction device opening/closing device 32, but at this time, one of the suction devices 31
is provided with the link mechanism 31b (see FIG. 6), so as the suction portions 31a are pressed against the bag 8, the bag 8 is first suctioned at the position where the suction portions 31a face each other. A vacuum generator (not shown) is connected to the suction section 31a through piping (not shown), and the vacuum generator starts operating at the same time as the suction tool opening/closing device 32 starts its closing operation. Furthermore, by continuing to press the suction section 31a that is suctioning the bag 8, the link to which the suction section 31a is attached is moved downward in FIG. 6. That is, in a state where the right suction part 31a suctions one side of the bag 8, it shifts downward by about 1 to 3 mm. Therefore, even if the inner surfaces of the bag 8 are in close contact, the gusset 81 portion of the bag 8 will be deformed due to displacement, creating a gap inside the bag 8, and air will enter the gap. The close contact of the inner surface of the bag 8 is destroyed. After breaking the adhesion of the inner surface of the bag 8, the pair of suction tools 31 are opened by the suction tool opening/closing device 32 with the bag 8 still adsorbed, and the rim of the bag 8 is opened.

The bag 8 with its mouth open is blown with air by the air blowing device 4, and is expanded into a rectangular cylindrical shape. That is, when the pair of suction devices 31 holding the bag 8 are opened by the suction device opening/closing device 32 and the mouth edge of the bag 8 is opened, the air blowing device 4 blows out blown air and pressurized air. is blown toward the opening of the bag 8. For example, if the folded dimensions of bag 8 are 325 mm in width and 600 mm in depth, the air used is 5 mmHg and 0.5 m ³ /
1 m ³ /min at 10 mmHg.
More preferably, it is at least 1 minute. Further, the pressure of the pressurized air used is preferably 1 kg/cm ² or more, more preferably 2 kg/cm ² or more.

Note that the blower 41c for blowing air is constantly operated, and the opening ratio of the rotary shutter 41b is adjusted by the rotary cylinder 41a, and the blowing of the blowing air is controlled, but if the blowing air pressure is low. Alternatively, the rotary cylinder 41a may be controlled to be kept open at all times. In the air blowing device 4, the blowing air is effective for expanding the entire bag 8, and the pressurized air is effective for expanding the four corners of the bag 8, so these are used in combination. In this way, the bag 8 can be opened in a short time and can be expanded in a short time.

The unfolded bag 8 is released from the suction state by the suction tool 31 and falls naturally into the container 9 that has been conveyed by the container conveyor 6.
Note that at the same time as the suction state of the suction tool 31 is released, the air blowing device 4 also stops blowing. Further, in this embodiment, one bag 8 is put into each container 9 from two sets of foldable bag unfolding devices, but this is not limited to this embodiment. isn't it.

The container 9 into which the bag 8 has been placed is carried out by the container transport conveyor 6. All operations are completed above, but for example, when the bag 8 sent out by the sending device 1 is being conveyed by the conveyor 2, sending out the next bag 8 can be started. Regarding bag 8, even if it takes about 8 seconds from the start of delivery to the end of unloading of container 9, a certain bag 8
The interval between delivery of the bag 8 and the next bag 8 is 3 to 4 seconds, and the bag 8 can be unfolded without needing to be expanded.

The embodiments of the foldable bag opening device of the present invention have been described above, but the present invention is not limited thereto. After inserting an air blowing tube into the mouth edge of the bag 8, the bag 8 may be expanded and shaped by sealing the mouth edge again and blowing air.

(Effects of the invention) As described above, the foldable bag opening device of the present invention includes a link mechanism on at least one suction device and a biasing device that biases the link mechanism. A foldable bag can be opened reliably and efficiently while destroying the adhesion of the inner surface, and has high industrial utility value.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the folding bag opening device of the present invention used in a folding bag unfolding device, Fig. 2 is a plan view thereof, and Fig. 3 is a left side view thereof. 4 is a detailed view of the delivery roller, a is a sectional view, b is a view taken along the line A-A, FIG. 5 is an enlarged front view of the auxiliary suction device (shown in cross section) and the auxiliary suction device lifting device, and FIG. 6 is a detailed view of the delivery roller. The figure is an enlarged plan view of the main parts of the bag opening device.
The figure is an enlarged perspective view of essential parts of the blowing air nozzle and pressurized air nozzle of the air blowing device, Figure 8 is a front view of the collapsible bag and also shows the positional relationship with the photo switch, and Figure 9 is a perspective view of the container. It is. 3...Bag opening device, 31...Adsorption tool, 31a...
Suction part, 31b...link mechanism, 31c...biasing tool, 32...adsorption device opening/closing device, 8...foldable bag.

Claims (1)

[Claims for Utility Model Registration] 1) A foldable bag opening device comprising a pair of suction devices having a suction portion for suctioning a foldable bag, and a suction device opening/closing device for opening and closing the suction devices, comprising: at least The mounting member to which one of the adsorption parts is attached can be freely deformed to narrow or widen the gap between the mounting member and the movable part in the opening/closing direction with respect to the movable part that is driven to open and close by the suction tool opening/closing device, and the gap can be narrowed. The folding device is characterized in that the mounting member is attached via a link mechanism that moves at right angles to the opening/closing direction, and is further provided with a biasing means for biasing the mounting member in a direction that increases the distance between the movable part and the mounting member. Type bag opening device. 2) The folding bag opening/closing device according to claim 1, wherein the link mechanism is a parallelogram link mechanism.