JPH08324517A - Method and apparatus for supplying bag in bag-filling/ packaging machine - Google Patents

Abstract

PURPOSE: To take bags one by one to supply it to a bag receiving part and also reduce cycle time required for transferring bags without discharging or damaging the bags. CONSTITUTION: A first swing arm 26 is swingably pivoted on a frame 10 close to a bag mounting device via brackets 25,25, while the arm 26 is swung between a bag take-out position and a bag transfer position. A rotary actuator 30 is placed on a piston rod 28a of an air cylinder 28 provided on the arm 26, so that the actuator 30 is advanced/ retreated in a direction of a swinging radius of the first swing arm 26. A second swing arm 31 is placed on the actuator 30, so that the arm 31 is swung between an operating position and a retreated position. A pair of suction bodies 35, 35 are placed on the arm 31 via a support rod 33, so that the suction bodies 35,35 attract a bag on the highest part of the bag mounting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bag feeding in a bag packing and packaging machine for supplying bags stacked in a bag placing device one by one to a bag receiving portion of a packaging machine for packing articles such as fruits and vegetables. A method and apparatus.

[0002]

2. Description of the Related Art Conventionally, articles such as fruits and vegetables are packed in bags in a predetermined number of units, sealed, and then shipped to the market. The packing machine for packing the articles in the bag in this manner is equipped with a bag supply device for supplying empty bags, each having an opening at one position, to the bag receiving section. As the bag supply device, for example, there is one having a structure disclosed in Japanese Utility Model Laid-Open No. 56-150705. In this bag supply device, a sub arm is rotatably supported via a pin at the tip of a main arm that is configured to be rotatable between a bag take-out position and a bag delivery position, and is provided on this sub arm. A suction cup capable of adsorbing the bag on the rod is provided. Then, with the main arm facing the bag unloading position, after suctioning and holding the vicinity of one longitudinal end (front end) of the uppermost bag stacked on the table with the suction cup, the suction cup moves away from the table. By rotating the sub-arm, the front end of the bag is separated from the lower bag. Next, by rotating the main arm in the direction in which the sub arm moves away from the table and moving it to the bag delivery position, the entire uppermost bag is separated and taken out from the lower bag, and the bag is then packed in the bag packing machine. It is configured to supply to the receiving part.

[0003]

In the bag feeding apparatus having the above-mentioned structure, the main arm is provided with the pivoting fulcrum on the rear end side opposite to the front end of the bag sucked by the suction cup. The bag is turned up from the front end side to the rear end side. In this case, when the main arm is rotated to the bag delivery position and the bags are turned up, the suction cups are located on the opposite side of the front ends of the bags stacked on the table with the bags sandwiched therebetween. Therefore, when the main arm returns to the bag take-out position immediately after delivering the bag to the bag holding device provided in the bag receiving section, the suction cup hits the vicinity of the part of the bag held by the bag holding device. However, there are drawbacks such that the bag is thrown off from the bag holding device and the bag and the suction cup are damaged. Therefore, by moving the bag held by the bag holding device to another position and then setting the main arm to return to the bag take-out position, the bag can be removed and damage to the bag and the suction cup can be prevented. However, in this case, the bag supply device cannot be operated until the bag moves to another position, resulting in a long cycle time and a new problem that cannot cope with speeding up.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the prior art described above, and has been proposed in order to solve the problems, and one bag is stacked from a group of stacked bags. Make sure to take it out and supply it to the bag receiving section of the bag filling and packaging machine, and shorten the cycle time by making it possible to perform the return operation immediately after handing over the bag without dropping it off or damaging it. An object of the present invention is to provide a bag feeding method and device in a bag filling and packaging machine that is designed to obtain the bag.

[0005]

In order to overcome the above-mentioned problems and achieve the intended purpose, a bag feeding method in a bag packing and packaging machine according to the present invention has a bag receiving section of a packing machine in which a bag in which articles are packed is packed. A method for supplying a bag to a holding device provided, wherein an adsorbent adsorbs the vicinity of the opening of the uppermost bag stacked on a bag placing device configured to be capable of automatic height adjustment, and the adsorbent is used. The second swing arm on which is disposed, with the pivotal support located on the bottom side of the bag as a fulcrum from the bag suction site of the adsorbent,
The opening side of the uppermost bag is separated from the lower bag group and flipped up by swinging the adsorbent from an operating position where it can be brought into contact with the bag to a retracted position where it is separated from the bag. A bag that allows the adsorbent to contact the bag with the first rocking arm provided with two rocking arms as a fulcrum with a pivotal support located further on the bottom side of the bag than the pivotal support of the second rocking arm. In the process of swinging from the take-out position to the bag delivery position, by returning the second swing arm from the retracted position to the operating position, the opening side of the bag taken out from the bag placing device is placed below the holding device. The adsorbent is brought closer to the holding device by extending the expansion / contraction means, and the vicinity of the opening of the bag adsorbed and held by the adsorbent is brought to a position where it can be held by the holding device. After holding the bag with and releasing adsorption by the adsorbent , The expansion / contraction means is contracted to separate the suction member from the holding device, the second swing arm is swung from the operating position to the retracted position, and then the first swing arm is moved from the bag delivery position to the bag removal position. It is characterized in that the second swing arm is returned from the retracted position to the operating position in the process.

Further, a bag feeding device in a bag packing and packaging machine according to another invention of the present application for preferably carrying out the above-mentioned method is equipped in the bag packing and packaging machine, and receives the bag into which the articles are packed. A bag supply device for supplying to a holding device arranged in a section, in which a large number of the bags are stacked, and the height of the bag group is automatically adjustable so that the uppermost part of the bag group is always kept at a substantially constant height position. The placing device and a free end of the bag placing device, which is disposed in the vicinity of the bag placing device and has a pivotal support portion located on the bottom side opposite to the opening side of the bags stacked on the bag placing device as a fulcrum. A first swing arm whose part side is swung between a bag take-out position close to the opening side of the bag and a bag delivery position close to the bottom side of the bag; and the first swing arm is a bag take-out position. Stacked on the bag supporting device and the pivotal support of the arm facing the bag The pivot portion is located between the opening side and the swing end so that its free end side is swung between an operating position near the opening side of the bag and a retracted position near the bottom side of the bag. And a second swing arm that is disposed on the second swing arm. The first swing arm faces the bag take-out position and the second swing arm faces the operating position. The adsorption device capable of adsorbing the vicinity of the opening of the stacked uppermost bag, the first swing arm facing the bag delivery position, and the second swing arm facing the operating position. The adsorbent that has come to the lower side of the second swing arm is moved back and forth in the direction of the swing radius of the second swing arm so that the bag sucked by the adsorbent is separated from the holding device and a position where it can be held. It consists of a telescopic means to move,
The second swing arm is swung from the operating position to the retracted position and the first swing arm is swung from the bag take-out position to the bag delivery position in a state where the suction member sucks the vicinity of the opening of the bag. Thus, after the bag adsorbed by the adsorbent has arrived below the holding device, the expansion / contraction means is extended to move the bag to a position where it can be held by the holding device, and the bag is held by the holding device. After holding and releasing the adsorption by the adsorbent, the expansion member is contracted to separate the adsorbent from the holding device, and the second swing arm is swung from the operating position to the retracted position. 1 The swing arm is set to swing from the bag delivery position to the bag removal position.

[0007]

The second swinging arm is swung from the operating position to the retracted position in a state in which the vicinity of the opening of the uppermost bag stacked on the bag placing device is sucked by the adsorbent disposed on the second swinging arm. By moving the uppermost bag, the opening side is separated from the lower bag group and flipped up. By swinging the first swing arm provided with the second swing arm from the bag take-out position to the bag delivery position, the bag adsorbed by the adsorbent is entirely separated from the bag in the lower layer. Then it can be turned up. After the second swing arm is returned to the operating position in the process of swinging the first swing arm from the bag take-out position to the bag delivery position, the expansion / contraction means is extended to remove the bag suction-held by the suction body. The vicinity of the opening faces a position where it can be held by a holding device arranged at the bag receiving position of the packaging machine. After passing the bag to the holding device, the first swing arm is moved to the bag delivery position in a state in which the expansion / contraction means is contracted to separate the suction body from the holding device and the second swing arm is swung to the retracted position. By swinging from the bag to the bag take-out position, the adsorbent comes into contact with the bottom side separated from the bag holding position and returns to the position for adsorbing the next bag.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bag feeding method in a bag filling and packaging machine according to the present invention will be described below with reference to the accompanying drawings in relation to an apparatus capable of suitably carrying out the method.

1 to 4 show a bag delivery station in a bag filling and packaging machine which employs the bag supply apparatus according to the embodiment, in which the bottom of the machine frame 10 in the packaging machine is provided. The bag placing device 11 is arranged. As shown in FIGS. 5 and 6, the bag placing device 11 includes a lift mechanism 13 as an automatic height adjusting means, a detection piece 18 and a level sensor 20 inside a main body 12,
The magazine mounting table 14 is configured to be movable up and down by the lift mechanism 13. This lift mechanism 13 is of a well-known pantograph type, and as shown in FIG.
An operating screw 8 is connected to a pair of pantograph mechanisms 7 and 7 connected to the left and right of the magazine mounting table 2 and the magazine mounting table 14. Further, an operating screw 8 is integrally rotatably connected to an output shaft of a motor 9 arranged in the main body 12, and by rotating the motor 9 in forward and reverse directions, a pair of pantograph mechanisms 7 are operated via the operating screw 8. , 7 are operated to raise and lower the magazine mounting table 14. A bag magazine 15 having an open upper side is detachably set on the magazine mounting table 14, and a large number of bags 16 formed so that an opening is provided at one place are stacked on the bag magazine 15. It is stored and placed. The height level (removal level) of the uppermost bag 16 stored in the bag magazine 15 is always kept substantially constant by controlling the operation of the lift mechanism 13 by the detection piece 18 and the level sensor 20. It is configured to do. When the size of the bag 16 is changed, the bag 16 is exchanged in magazine units.

At the bottom of the main body 12 of the bag placing device 11, a holder 17 is erected at a position where it does not interfere with the bag magazine 15, and an L-shaped detection piece 18 is provided on the holder 17.
Is pivotally supported. The detection piece 18 is configured so that the first arm 18a extending from the pivotal portion thereof to above the magazine placing table 14 swings by its own weight to come into contact with the uppermost portion of the bag group stored and placed in the bag magazine 15. Is set. A cutout 15a (see FIG. 2) is formed across the side and bottom of the bag magazine 15 corresponding to the first arm 18a, and the first arm 18a is connected to the bag 16 through the cutout 15a.
It comes into contact with. Further, the holder 17 has a second portion extending downward from a pivot portion of the detection piece 18.
A stopper 19 is arranged on the opposite side of the magazine mounting table 14 with the arm 18b interposed therebetween, and the detection piece 18 swings by its own weight.
The second arm 18b is configured to be restricted from swinging (clockwise in FIG. 5) at a position where the second arm 18b contacts the stopper 19.

Further, the holder 17 is provided with a level sensor 20, which is used as the bag magazine 15.
The second arm 18b is positioned at a position where the second arm 18b can be detected in a state where the lower surface of the first arm 18a that is in contact with the bag 16 is substantially horizontal (the state shown by the chain double-dashed line in FIG. 5). Then, the bag 16 is taken out from the bag magazine 15 by the bag supply device 24, which will be described later, and the first arm 18a is moved along with the lowering of the taking-out level of the uppermost part of the bag group.
Tilts downward and the second arm 18b swings in the clockwise direction to stop the level sensor 20 from detecting the arm 18b, so that the lift mechanism 13 is operated to raise the magazine mounting table 14. Is set. Also,
As the magazine mounting table 14 rises, the uppermost take-out level in the bag group rises, and the first arm 18a is pushed upward, whereby the second arm 18b swings counterclockwise and the level sensor 20 is the second arm 18 again
By stopping the lift mechanism 13 when b is detected, the uppermost take-out level of the bag group stored and placed in the bag magazine 15 can be kept substantially constant. The level sensor 20 is set so as not to detect the arm 18b at the position where the second arm 18a of the detection piece 18 contacts the stopper 19.

As shown in FIG. 2, a bagless sensor 22 is provided on a bracket 21 standing on the bottom surface of the main body 12 of the bag loading device 11, and the sensor 22 is integrally lifted up and down on the magazine loading table 14. A detection plate (not shown) arranged so as to detect is configured to be detectable. In addition, by removing the last bag 16 from the bag magazine 15, the bag 1
The bagless sensor 22 is positioned so as to detect the detection plate when the magazine mounting table 14 rises above the take-out level of 6, so that it can detect that all the bags 16 have been taken out from the bag magazine 15. It is set. That is, when all the bags 16 are taken out from the bag magazine 15, the magazine mounting table 14 rises due to the action of the detection piece 18 and the level sensor 20, but the first arm 18a is pushed upward because there is no bag 16. Can not be raised, the mounting table 1
The number 4 indicates that the bag-less sensor 22 moves up to the position where it detects the detection plate, thereby detecting the bag-less state. When the bagless sensor 22 detects the detection plate, the lift mechanism 13 is reversely operated to lower the magazine mounting table 14. Also, the bracket 21
Is provided with a lower limit sensor 23 below the bagless sensor 22, and when the sensor 23 detects a detection plate (not shown) that is disposed on the magazine mounting table 14 and moves integrally. The lift mechanism 13 is set to be stopped and controlled. A cutout (not shown) is formed in a portion of the magazine mounting table 14 corresponding to the first arm 18a, and the bag 16
When there is no longer the second piece of the detection piece 18 through the notch
The arm 18b swings to a position where it is not detected by the level sensor 20, and the mounting table 14 that rises does not push the first arm 18a upward.

The bags 16 are taken out of the bag magazine 15 of the apparatus 11 one by one outside the side of the bag placing apparatus 11,
A bag supply device 24 for supplying a holding device 38 described later is arranged. This bag supply device 24, as shown in FIG.
A pair of brackets 25, 25 arranged on the machine frame 10 adjacent to the outside of the bag placing device 11 is provided with a first swing arm 26 whose one end is swingably supported. The first swing arm 26 has a connecting rod 27 connected to a driving means (not shown).
One end of the first swing arm 26 is pivotally supported, and the first swing arm 26 is moved to the bag taking-out position by operating the connecting rod 27 by the driving means.
It is configured to swing between (FIG. 7) and the bag delivery position (FIG. 11). Further, the pivot portion of the first swing arm 26 is provided on the bottom side 16 of the bags 16 stacked on the bag placing device 11.
b (see FIG. 3), the first swing arm 26 in the substantially upright bag delivery position shown in FIG. 1 is swung counterclockwise, so that as shown in FIG. The free end of the bag 16 is moved to a substantially horizontal bag take-out position near the opening 16a of the bag 16.

On the free end side of the first swing arm 26, as shown in FIG. 1, the piston rod 28a is directed outward in the swing radius direction of the arm 26, and air as expansion / contraction means is provided. A cylinder 28 is disposed and fixed, and a rotary actuator (oscillating means) 30 is disposed on a piston rod 28a of the cylinder 28 via a bracket 29. The rotary actuator 30 is positioned so that its output shaft extends parallel to the axis of the pivot portion of the first swing arm 26, and one end of the second swing arm 31 is attached to the output shaft. That is, the second swing arm 31
Oscillates in the same direction as the first oscillating arm 26. Then, the rotary actuator 30
The second swing arm 31 is configured to swing between the operating position shown in FIG. 7 and the retracted position shown in FIG. 8 by applying forward and reverse bias in the range of 0 °. In the state where the first swing arm 26 faces the bag take-out position shown in FIG. 7, the free end of the second swing arm 31 facing the operating position approaches the opening side 16a of the bag 16, By swinging the arm 31 to the retracted position, its free end is set to be close to the bottom side 16b of the bag 16.

On the free end side of the second swing arm 31,
A support rod 33 having a pair of mounting members 32, 32 disposed at both ends in the axial direction is disposed and fixed via one mounting member 32, and the rod 33 swings integrally with the second swing arm 31. Is configured to. As shown in FIGS. 2 and 4, the support rod 33 extends in the width direction of the bag 16 intersecting with the expansion / contraction direction of the piston rod 28a of the air cylinder 28, and faces the bag mounting device 11 above. There is. A pair of moving bodies 34, 34 are slidably disposed between the two mounting members 32, 32 of the support rod 33 so as to be axially separated from each other. Each moving body 34 has a suction hole 35b on one side surface 35a. The adsorbents 35 formed with are respectively arranged. When the second swing arm 31 is swung to the operating position by the urging force of the rotary actuator 30, the suction members 35, 35 have suction holes 35b as shown in FIG.
The suction surface 35a formed with the
The uppermost bag 16 is set so as to face the opening in a substantially parallel manner. And in this state, the adsorbent 3
The vicinity of the opening of the bag 16 is suction-held by activating a vacuum suction source (not shown) connected to the bag 5.

When the second swing arm 31 is swung from the operating position to the retracted position by the urging force of the rotary actuator 30, the suction member 35, as shown in FIG. The uppermost bag 16 is swung in a direction away from the upper side 16b so that the uppermost bag 16 moves from the opening side 16a to the bottom side 16b.
It is designed to turn up toward. The center C ₂ of the pivot portion of the second swing arm 31 when the first swing arm 26 faces the bag taking-out position is stacked on the bag placing device 11 as shown in FIG. It is set so as to substantially match the take-out level of the uppermost bag 16. Thus, the movement trajectory of the suction body 35 when swinging the suction body 35 from the operating position to the retracted position is as shown in FIG.
As indicated by the alternate long and short dash line, the bag 16 does not project from the bag suction position to the opening side 16a of the bag 16 but goes to the bottom side 16b. Therefore, the opening side 16 of the bag 16 suction-held by the adsorbent 35
Since a can be flipped up without moving to the opening side 16a, the lower bag 16 does not move due to friction.

Between the pair of mounting members 32, 32 arranged on the support rod 33, the screw shaft 3 parallel to the rod 33 is provided.
6 is rotatably supported and has a left screw portion 36a and a right screw portion 3 which are symmetrically formed on the screw shaft 36 with an axial center interposed therebetween.
6b are screwed into the corresponding moving bodies 34, 34. Further, an adjusting member 37 is fixed to the center of the screw shaft 36, and the screw shaft 36 is rotated in the forward and reverse directions via the adjusting member 37, whereby the left and right screw portions 36a, 36 of the screw shaft 36 are rotated.
Under the action of b, the pair of moving bodies 34, 34 move to the supporting rod 3
Move close to and away from each other along 3,33. As a result, when the widthwise dimension of the bag 16 changes, the pair of adsorbents 35, 35 are moved to a position where the changed bag 16 can be favorably adsorbed by moving both the moving bodies 34, 34. You can face it.

The bag receiving portion of the packaging machine located above the bag placing device 11 holds the vicinity of the opening of the bag 16 taken out by the bag supply device 24 and holds the opening of the bag 16 at the opening. A holding device 38 that is open is provided. That is, as shown in FIG. 3, the brackets 40, 40 are attached to the machine frames 10, 10 separated in the swinging direction of the first swinging arm 26.
Air cylinders 41, 41 are arranged to face each other via the. The other air cylinder 4 in each air cylinder 41
An arm 42 is arranged on a piston rod 41a directed to 1, and a suction member 43 connected to a vacuum suction source (not shown) is arranged and fixed to the arm 42. Both suction members 4
Adsorption holes (not shown) are formed in the adsorbing surfaces 43a, 43a facing each other of the air-container 3, 43, and the adsorbing members 43, 43 are moved to the adsorbing surface 4 by synchronously urging both air cylinders 41, 41.
3a and 43a are moved so as to approach and separate from each other. When both the suction members 43, 43 approach each other (see FIG. 11), the outer surface of the bag 16 is suction-held by the suction surface 43a, and when the suction members 43, 43 are separated from each other (see FIG. 13), and is configured to open the opening of the bag 16.

The suction members 43, 43 in the holding device 38 are located above the support rod 33 and above the support rod 33 when the first swing arm 26 reaches the bag delivery position.
Bag 16 that does not interfere with the pair of adsorbents 35, 35 disposed in the
It is set to face the center position in the width direction of. The height position of the suction members 43, 43 is a state in which the piston rod 28a of the air cylinder 28 is contracted and the second swing arm 31 is held in the operating position in the first swing arm 26 facing the bag delivery position. Is located above the opening side 16a of the bag 16 that is adsorbed and held by the adsorbents 35, 35,
By extending the piston rod 28a of the air cylinder 28, the vicinity of the opening of the bag 16 is set to face between the suction members 43,43.

[0020]

Operation of the Embodiment Next, the operation of the bag feeding device in the bag filling and packaging machine according to the embodiment will be described in relation to the bag feeding method. In the standby state for delivery of the bag 16, FIG.
As shown in, the holding device 38 of the bag receiving portion of the bag filling and packaging machine separates the pair of suction members 43, 43 from each other. Further, in the bag feeding device 24, the first rod is provided with the piston rod 28a of the air cylinder 28 contracted.
The swinging arm 26 faces the bag taking-out position, and the second swinging arm 31 faces the operating position, so that the suction members 35, 35
The uppermost bag 16 stacked on the bag placing device 11
It is located near the opening.

When the bag supply device 24 is operated in this state, the vacuum suction source connected to the adsorbents 35, 35 is activated, and the uppermost bag 16 is attached to the adsorbing surfaces 35a, 35a of the adsorbents 35, 35. Are adsorbed and held. Then, the rotary actuator 30 is urged to move the second actuator as shown in FIG.
The swing arm 31 is swung from the operating position to the retracted position,
Along with this, the vicinity of the opening of the uppermost bag 16 is turned up. At this time, the center C ₂ of the pivot portion of the second swing arm 31 is set so as to substantially coincide with the take-out level of the uppermost bag 16 stacked on the bag placing device 11, so that the adsorbent 35 is provided. , 35 does not move the lower bag 16 by suction.

Next, the connecting rod 24 is operated by a driving means (not shown), and the first swing arm 26 is swung from the bag take-out position to the bag delivery position. As a result, as shown in FIG. 9, the bag 16 adsorbed and held by the adsorbents 35, 35 is entirely separated from the lower bag group and flipped upward. In addition, since the opening side 16a of the bag 16 is turned up in advance by the swing of the second swing arm 31, it is easy for air to enter between the uppermost bag 16 and the lower bag 16. The lower layer bag 16 is prevented from being flipped up while being in close contact with the uppermost bag 16.
Thereby, the bags 16 can be separated one by one from the group of bags stacked on the bag placing device 11 and supplied to the bag receiving section. In addition, the center C ₁ of the pivot portion of the first swing arm 26
Is the uppermost bag 1 stacked on the bag placing device 11.
Since it is set so as to substantially coincide with the take-out level of No. 6, the first swing arm 26 moves from the bag take-out position to the bag delivery position as in the case where the second swing arm 31 is swung from the operating position to the retracted position. The movement locus of the adsorbent 35 facing the retracted position when swinging to the front is as shown by the alternate long and short dash line in FIG.
The bags 16 stacked on the bag placing device 11 move toward the bottom side 16b without protruding toward the opening side 16a. Therefore, since the bag 16 to be flipped up can be flipped up without moving to the opening side 16a of the bag 16 in the lower layer, the bag 16 in the lower layer does not move due to friction.

At the timing when the first swing arm 26 is swung by the required angle from the bag take-out position toward the bag delivery position, the rotary actuator 30 is reversely biased and the second swing arm 26 is swung as shown in FIG. The moving arm 31 is swung from the retracted position to the operating position. When the first swing arm 26 reaches the bag delivery position, the air cylinder 2
The piston rod 28a of No. 8 extends and the adsorbent 35,
In the vicinity of the opening of the bag 16 sucked and held by the suction device 35, a pair of suction members 43, which stands by for separating the holding device 38,
43 between them (see FIG. 11). Next, the air cylinders 41, 41 are synchronously urged to move the suction members 43,
When the suction members 43 are brought close to each other and the vacuum suction source connected to each suction member 43 is operated, the suction members 4
Both outer surfaces of the bag 16 facing each other are suction-held by the suction surfaces 43a, 43a of the suction bag 3, 43. Then, the suction of the bag 16 by the suction members 35, 35 of the bag supply device 24 is released, and the delivery of the bag 16 is completed.

Next, the rotary actuator 3
0 is urged and the second swing arm 31 is swung from the operating position to the retracted position, whereby the suction bodies 35, 35 are separated from the bag 16 held by the holding device 38. Also the first
Piston rod 2 of air cylinder 28 of swing arm 26
8a shrinks, and as shown in FIG. 12, the adsorbents 35, 35
Is below the holding position of the bag 16 by the holding device 38 (bag 1
6 to the bottom side 16b). In this state, the connecting rod 24 is actuated, and the first swing arm 26 is swung from the bag delivery position to the bag removal position. At this time, the adsorbents 35, 35 come into contact with the bag 16 held by the holding device 38, but since the contact position is the bottom side 16b away from the holding position, the bag 16 is not removed ( (See FIG. 13). Further, since the bottom side 16b of the bag 16 is in a free state, even if the adsorbents 35, 35 come into contact with each other, the bag 16 is curved without being damaged and allows the adsorbents 35, 35 to pass therethrough. That is, the bag 16 held by the holding device 38
It is possible to swing the first swing arm 26 of the supply device 24 from the bag delivery position to the bag unloading position immediately after the bag 16 is delivered, without waiting for the supply device 24 to stop and wait until the bag moves to another position. it can. This makes it possible to shorten the bag delivery cycle time and cope with the speedup of the packaging machine. In addition, the adsorbent 35 of the supply device 24,
When 35 moves downward from the holding position of the bag 16 by the holding device 38, the air cylinders 41, 41 are synchronously reversely biased to separate the suction members 43, 43 from each other, and the bag 1
The opening 6 is opened.

After the suction bodies 35, 35 have passed through the bag 16, the rotary actuator 30 is reversely biased to swing the second swing arm 31 from the retracted position to the operating position. As a result, when the first swing arm 26 arrives at the bag take-out position, the vacuum suction source connected to the adsorbents 35, 35 is actuated, so that the uppermost part stacked on the bag placing device 11 is moved. The vicinity of the opening of the bag 16 is suction-held.

The bags 16 stacked on the bag placing device 11 are taken out, and the detection piece 18 swings clockwise as the taking-out level of the uppermost bag 16 is lowered,
When the level sensor 20 no longer detects the second arm 18b, the lift mechanism 13 operates and the magazine mounting table 14
To rise. Since the position of the uppermost bag 16 rises as the magazine mounting table 14 rises, the first arm 18a of the detection piece 18 in contact with the bag 16 is pushed upward. As a result, the second arm 18b swings counterclockwise, and when the level sensor 20 detects the arm 18b again, the lift mechanism 13 is stopped and controlled, and the uppermost bag 16 is stopped.
The take-out level of is always kept at a constant height.

When all the bags 16 are taken out from the bag placing device 11, the first arm 18 of the detection piece 18 is used.
Since a is no longer pushed up by the bag 16, the second
The arm 18b is held in a state where it is not detected by the level sensor 20. Therefore, the level sensor 20 is the second arm 1
The magazine mounting table 14 that has started to rise by not detecting 8b moves up until the bagless sensor 22 detects a detection plate that moves up and down together with the mounting table 14, thereby detecting the absence of a bag. Then, the bagless sensor 22 detects the absence of the bag, the magazine mounting table 14 descends, and the mounting table 14
When the lower limit sensor 23 detects a detection plate that moves integrally with the lift mechanism 13, the lift mechanism 13 is stopped and controlled to wait for the bag 16 to be replenished.

In the bag supply device according to the embodiment, the rotary actuator is used as the swinging means of the second swing arm, but a linear actuator such as an air cylinder may be used. Further, the number of the adsorbents provided on the second swing arm does not have to be two as in the embodiment, and if the number of adsorbents provided to the second swing arm does not hinder the delivery to the holding device, the number of adsorbents is three or more. May be. It is also possible to use a suction cup instead of the adsorbent. Furthermore, in the embodiment, the case where the air cylinder is used as the expansion / contraction means has been described, but a motor-driven linear actuator or the like may be adopted. Further, the expansion / contraction means may be arranged on the second swing arm, and the expansion / contraction means may move the adsorbent forward and backward with respect to the second swing arm in the swing radius direction.

[0029]

As described above, according to the bag feeding method and device in the bag filling and packaging machine according to the present invention, the vicinity of the opening of the uppermost bag sucked and held by the suction member is provided with the second swing arm. After it is turned up to make it easier for air to enter between the bag in the lower layer and the first swinging arm, it is turned up in the same direction. The lower layer bag is not stuck by the pressure, and the bags can be reliably separated one by one and supplied to the holding device of the bag packaging machine. Further, since the bag sucked by the suction member is moved by the expansion / contraction means to a position where it can be held by the holding device, the holding device is not retracted to a position where it does not interfere when swinging the first swing arm. The bag can be delivered and received satisfactorily. Furthermore, after the bag is delivered to the holding device, the adsorbent is separated from the holding position of the bag held by the holding device by contracting the expansion / contraction means and swinging the second swing arm to the retracted position. Thus, the first swing arm can be returned from the bag delivering position to the bag taking-out position immediately after delivering the bag. That is, when the first swing arm is returned to the bag take-out position, the adsorbent comes into contact with the part of the bag held by the holding device, which is separated from the holding position.
It is possible to prevent the bag from being dropped off or damaged. As a result, the time required for the returning operation after the bag is delivered can be shortened, and the bag can be sucked and delivered with a margin correspondingly, and the supply of the bag is stabilized. Also, the first
Since there is no restriction on the timing of the return movement of the swing arm, it is possible to cope with the speeding up of packaging.

Since the center of pivot of the pivots of the first and second swing arms is set to substantially coincide with the plane level of the uppermost bag in the bag placing device, the second swing arm is moved to the operating position. The uppermost bag adsorbed by the adsorbent to the opening side of the lower layer bag when swinging from the bag to the retracted position or when swinging the first swing arm from the bag take-out position to the bag delivery position. It can be turned up to the bottom side without. Therefore, when the bag adsorbed by the adsorbent is turned up, it is possible to surely separate the lower bag without moving it to the opening side.
By arranging the pair of adsorbents arranged on the second swing arm so as to be movable toward and away from each other in the width direction of the bag, it is possible to easily cope with a change in the width dimension of the bag. .

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a bag supply device according to an embodiment in a state in which a bag is delivered to a holding device.

FIG. 2 is a partial vertical cross-sectional front view showing a bag feeding device arranged in the bag delivering station of the bag filling and packaging machine according to the embodiment in a state where the bag is delivered to the holding device.

FIG. 3 is a side view showing the bag supply device arranged in the bag delivery station of the bag filling and packaging machine according to the embodiment in a state where the bag is taken out from the bag placing device.

FIG. 4 is a plan view showing the bag supply device arranged in the bag delivery station of the bag filling and packaging machine according to the embodiment in a state where the bag is taken out from the bag placing device.

FIG. 5 is a side view showing a bag placing device of the bag supply device according to the embodiment.

FIG. 6 is a plan sectional view showing a bag placing device of the bag feeding device according to the embodiment.

FIG. 7 is an explanatory diagram showing a bag delivery process by the bag supply device according to the embodiment.

FIG. 8 is an explanatory diagram showing a bag delivery process by the bag supply device according to the embodiment.

FIG. 9 is an explanatory diagram showing a bag delivery process by the bag supply device according to the embodiment.

FIG. 10 is an explanatory view showing a bag delivering process by the bag supply device according to the embodiment.

FIG. 11 is an explanatory diagram showing a bag delivering process by the bag supply device according to the embodiment.

FIG. 12 is an explanatory diagram showing a bag delivery process by the bag supply device according to the embodiment.

FIG. 13 is an explanatory view showing a bag delivering process by the bag supply device according to the embodiment.

FIG. 14 is an explanatory diagram showing swing loci of the first swing arm and the second swing arm of the bag supply device according to the embodiment.

[Explanation of symbols]

 11 Bag Placement Device 14 Magazine Placement Table 15 Bag Magazine 16 Bags 16a Opening Side 16b Bottom Side 26 First Swing Arm 28 Air Cylinder (Expanding Means) 30 Rotary Actuator (Swinging Means) 31 Second Swing Arm 35 Adsorption Body 38 holding device

Claims (6)

[Claims] 1. A bag supply method for supplying a bag (16) in which articles are packed to a holding device (38) arranged in a bag receiving portion of a packaging machine, wherein the bag mounting is configured to be automatically height adjustable. The vicinity of the opening of the uppermost bag (16) stacked on the placing device (11) is adsorbed by the adsorbent (35), and the second swing arm (31) on which the adsorbent (35) is arranged is attached. The bag of the adsorbent (35) is a bag from an operating position where the adsorbent (35) can be brought into contact with the bag (16) with a pivotal support located on the bottom side (16b) of the bag (16) from the adsorption site. By swinging to the retracted position separated from (16), the opening side (16a) of the uppermost bag (16) is separated from the lower bag group and turned up, and then the second swing arm ( The first swing arm (26) on which the (31) is arranged is further separated from the pivotal support of the second swing arm (31) by a bag.
In the process of swinging from the bag take-out position where the adsorbent (35) can be brought into contact with the bag (16) to the bag delivery position, with the pivotal support located on the bottom side (16b) of (16) as the fulcrum, 2 Swing arm (3
By returning 1) from the retracted position to the operating position, the opening side (16a) of the bag (16) taken out from the bag placing device (11) is brought below the holding device (38), The adsorbent (35) is brought close to the holding device (38) by extending the expansion and contraction means (28), and the vicinity of the opening of the bag (16) adsorbed and held by the adsorbent (35) is held by the holding device (38). ), The holding device (38) holds the bag (16) and the adsorbent (35).
After releasing the suction by means of, the expansion / contraction means (28) is contracted to separate the suction body (35) from the holding device (38), and the second swing arm (31) is swung from the operating position to the retracted position. Then, the first swing arm (26) is swung from the bag delivery position to the bag removal position, and in the process, the second swing arm (31) is returned from the retracted position to the operating position. A method for supplying bags in a bag filling and packaging machine. 2. The pivot parts of the first swing arm (26) and the second swing arm (31) are located outside the bag group stacked on the bag placing device (11), and Pivot center (C
The bag feeding method for a bag filling and packaging machine according to claim 1, wherein ( ₁ , C ₂ ) is set so as to substantially coincide with the plane level of the uppermost bag (16). 3. A holding device provided in a bag packaging machine, wherein a bag (16) in which articles are packed is arranged in a bag receiving portion of the packaging machine.
A bag supply device for supplying to (38), in which a large number of the bags (16) are stacked, and the height of the bag group is configured to be automatically height-adjustable so that the uppermost part of the bag group is always kept at a substantially constant height position. A placing device (11) and the bag placing device (11), which is disposed in the vicinity of the bag placing device (11).
The free end side is the opening side of the bag (16) with the pivotal support located on the bottom side (16b) opposite to the opening side (16a) of the bags (16) stacked in (11) as a fulcrum. A first swing arm (26) swingable between a bag take-out position close to the bag (16a) and a bag delivery position close to the bottom side (16b) of the bag (16); A pivotal support is provided between the pivotal support of the arm (26) and the opening side (16a) of the bags (16) stacked on the bag placing device (11) with the (26) facing the bag removal position. Position to,
The free end side of the swinging means (30) swings between an operating position close to the opening side (16a) of the bag (16) and a retracted position close to the bottom side (16b) of the bag (16). Second swing arm moved (31)
And the second swing arm (31) disposed on the second swing arm (31) so that the first swing arm (26) faces the bag take-out position.
An adsorbent (35) capable of adsorbing in the vicinity of the opening of the uppermost bag (16) stacked on the bag placing device (11) with the adsorbent (35) facing the operating position, and the first swing arm (26). ) To the bag delivery position and the second swing arm (31) to the operating position so that the suction member (35) is made to reach below the holding device (38).
Are moved forward and backward in the direction of the swing radius of the second swing arm (31) to separate the bag (16) sucked by the suction body (35) from the holding device (38) and a position where it can be held. And a retracting means (28) for moving the second swing arm (31) from the operating position to a retracted position with the adsorbent (35) adsorbing the vicinity of the opening of the bag (16). And the first swing arm (26) is swung from the bag take-out position to the bag delivery position, so that the bag (16) adsorbed by the adsorbent (35) is moved to the holding device (38). After coming down, the expansion means (28) is extended to set the bag (16) to a position where it can be held by the holding device (38), and the holding device (38) holds the bag (16). Hold and adsorbent (35)
After releasing the suction by means of, the expansion / contraction means (28) is contracted to separate the suction body (35) from the holding device (38), and the second swing arm (31) is swung from the operating position to the retracted position. A bag supply device in a bag packing and packaging machine, wherein the first swing arm (26) is set to swing from the bag delivery position to the bag removal position in this state. 4. A pair of adsorbents (35, 35) capable of adsorbing the vicinity of the opening of the bag (16) are provided so as to be movable toward and away from each other in the width direction of the bag (16). The bag supply device for a bag filling and packaging machine according to claim 3, wherein the position of the (35, 35) can be adjusted according to the width dimension of the bag (16). 5. Pivot portions of the first swing arm (26) and the second swing arm (31) are located outside the bag group stacked on the bag placing device (11), and Pivot center (C
_1, C ₂₎ is a bag supply device in a bag filling packaging machine according to claim 3 or 4, wherein it is set to a plane level substantially match the top of the bag (16). 6. The bag placing device (11) includes a bag magazine (15) for accommodating a large number of bags (16) in a stacked state, and a magazine placing table (14) on which the bag magazine (15) is placed. ) And automatic height adjusting means (13, 18, 20) for adjusting the height level of the uppermost bag (16) in the bag magazine (15) to be substantially constant. The bag supply device in the bag filling packaging machine in any one of Claims 1-4.