JP2842180B2 - Packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging apparatus for packaging an object to be packaged in a heat sealable film.

[0002]

2. Description of the Related Art Conventionally, in order to package an object to be packaged, a bag made of a heat-sealable film is hung laterally and supported as proposed in Japanese Utility Model Publication No. 58-45,204. In this state, an object to be packaged is accommodated from one side opening of the bag, and then the inside of the bag is evacuated, and then the opening is heat-sealed.

[0003]

In the above-mentioned prior art, since a bag made in advance is used, a commercially available bag must be purchased and the cost is high. In addition, the bag is suspended and supported. The opening has to be opened by a suction member or the like to accommodate the article to be packaged, and therefore, there has been a problem that a complicated apparatus is required for the bag opening process.

For this reason, by using a two-fold mechanism proposed in Japanese Utility Model Publication No. 5222525 to solve the above-mentioned problem, the two-fold mechanism is used while continuously pulling out the belt-like film forward. Fold in two, house the packaged material in a two-fold band-shaped film, and seal it three-sided with a three-side sealing device consisting of a rear part, an upper part and a front part, and cut the film to make a bag in a series of steps. It is conceivable to seal the package.

However, in the above-described conventional example, when a relatively bulky food product, for example, a packaged material such as mushrooms is accommodated in a two-fold band-shaped film and heat-sealed, it corresponds to a seal portion. The film is likely to swell at the point where it is to be swelled, which makes it difficult to seal both sides of the film, so that both ends are difficult to align, and the film is partially loosened. It is expected that wrinkles are likely to occur and the commercial value will be reduced.

Therefore, the applicant of the present application clamps the upper edge of the front end portion of the folded film in the advancing direction in which the packaged object is accommodated by the bag clamping mechanism, and pulls the bag clamping mechanism in the traveling direction of the film to form the cylindrical film. Sealing and cutting of the rear part, the cut bag is guided on the tray by the bag clamping mechanism, and while the tray is being transported in the width direction of the bag, the lower portion of the folding member provided in the middle of this transport is provided. The upper edge of the bag, which is an excess portion of the bag, is folded back, and the bag mouth of the folded bag is twisted and then sealed with the bag mouth heat sealing member to prevent the film from being loosened. One is proposed in Japanese Patent Application Laid-Open No. Hei 1-226506.

However, when the tubular film is guided onto the tray by the bag clamping mechanism, the bag mouth located on the front end side of the bag is caught by the tray and the bag mouth is pushed and partially inward. The bag mouth portion is distorted by being bent or the bag mouth portion being crushed, and as a result, the upper edge portion of the bag which becomes an excess portion of the bag, that is, the side edge of the bag is folded back by the folding member performed thereafter. Is not stable, the sealing position of the bag mouth is disturbed, and the entire bag mouth cannot be sealed in some cases. In addition, if the packaged object accommodated in the bag is bulky, the bag mouth of the bag tends to spread, and in this state, the side edge located on the upper side of the bag which is an excess portion of the bag is folded back. However, even if the bag mouth is easily lifted to its original position, and then the bag mouth is pinched by the pinching claws and twisted, the position where the bag mouth is sandwiched is not stable, and this is the next step. In some cases, the bag mouth portion cannot be satisfactorily sealed by the bag mouth portion heat sealing member.

In view of the above, according to the present invention, when the tubular film is guided onto the tray by the bag sandwiching and feeding device, the tubular film can be pulled out and guided on the tray while preventing the bag mouth portion from spreading. It is an object of the present invention to provide a packaging device capable of improving the folding of a side edge which is an upper edge portion which becomes an excess portion of a bag, and twisting a bag mouth portion in this state to stabilize heat sealing. .

[0009]

SUMMARY OF THE INVENTION According to the present invention, both ends of a strip film are folded in half by a folding apparatus while continuously pulling out the heat sealable strip film in a forward direction.
Both ends of the two-fold band-shaped film are guided upward to be pulled out, and the packaged object is accommodated in the two-fold band-shaped film, and the upper part of the two-fold band-shaped film is sealed to form the film into a cylindrical shape, The front end of the tubular film in the traveling direction is pinched and guided by a bag pinching and feeding device, and the rear portion of the tubular film is sealed and cut at the rear by a rear sealing / cutting device, and the cut bag is cut. Is guided on a substantially U-shaped tray by the bag sandwiching and feeding device, the tray is transferred in the width direction of the bag, and the upper part of the bag is placed along the lower part of the folding member provided in the middle of the transfer. Then, the upper edge of the bag is folded back, and the bag mouth of the folded bag is twisted and then sealed by the bag mouth heat sealing member. A bag opening temporary sealing portion for sealing a part of a substantially central portion of the tubular film is provided at a rear portion of the rear sealing / cutting device which is operated and which is opposite to the direction in which the film is pulled out. .

[0010]

[Function] A bag-opening temporary sealing portion for sealing a part of a substantially central portion of a cylindrical film is provided at a rear portion of a rear sealing / cutting device opposite to a direction in which the film is pulled out, thereby clamping the bag. When the bag device of the tubular film is pinched and guided by the feeding device and pulled out, since the substantially central portion of the bag device is temporarily sealed, the bag device does not extremely widen. The bag can be guided on the tray in a stable manner, and the next step, ie, the turnover of the upper edge of the bag, which is the surplus portion of the bag, is stabilized, and in this state, the bag mouth is twisted and sealed. .

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 13, reference numeral 1 denotes a machine base, and a roll 3 of a heat-sealable band-like film 2 such as transparent polyethylene or vinyl is rotatable via a support plate 4 on the upper rear end of the machine base 1. It is provided in. Reference numeral 5 denotes a two-folding device for the band-shaped film 2 provided in front of the roll 3. The two-folding device 5 lowers the folding member 6 having a triangular planar shape as it goes forward through the support plate 4A. It is configured to be mounted in an inclined forward leaning state.

The bending member 6 has a tapered surface 7 which inclines inward as it goes upward on both side surfaces, and a sharp portion 8 having a V-shaped side surface at the front end. The bending member 6 has a long hole 9 at the rear end side and a loosely tightenable fixing member.
The front member is supported in a height-adjustable manner through 10, and the front upper surface is pivotally connected by a pivotable link arm 12 via a shaft support 11, and the bending member is adjusted by adjusting the height of the rear end side. 6 can be selected, whereby the vertical positional relationship of the two-fold band-shaped film 2A can be set arbitrarily.

A pair of left and right feed rollers 13 made of a hard elastic material are vertically provided at the front end of the bending member 6 in a contact state. Then, the belt-shaped film 2 continuously pulled out from the roll 3 by means described later is guided to the two-folding device 5 through a plurality of guide rolls 14 and tension rolls 15 and is formed on both side tapered surfaces 7 of the bending member 6. The two-fold band-shaped film 2 </ b> A is formed in two folds along the line, and is thus guided to the next step by the rotation of the feed roller 13.

Reference numeral 16 denotes an opening device provided in front of the folding device 5, which is constituted by an opening guide plate 17 having an L-shaped cross section and provided in parallel with each other at predetermined intervals in parallel to the left and right. . Then, the films 2 on both sides of the two-fold film 2A guided by the feed roller 13 are respectively fed along the outer surface of the opening guide plate 17, whereby openings 18 are formed at intervals between the left and right opening guide plates 17. Is done. In this open state, a packaged object 19 made of, for example, enoki mushroom is manually inserted into the two-fold band-shaped film 2A from the opening 18.

Reference numeral 20 denotes an upper sealing device provided horizontally in front of the opening device 16, and an upper plate 22 is horizontally mounted above the machine base 1 via a supporting member 21. A pair of heat seal members 23, 23A having a predetermined length corresponding to the product are provided on the lower surface of 22. In this case, one heat seal member 23 is fixed to the upper plate 22, and the other heat seal member 23A is provided so as to be able to advance and retreat with respect to the one heat seal member 23 by the cylinder 24.

The heat sealing members 23 and 23A are integrally provided with a pair of pressing members 25 and 25A. The heat sealing member 23A is provided with a guide rod 26, and the guide rod 26 is provided with a coil. A spring 27 is wound. A contact plate 28 is provided on the heat seal member 23A via a leaf spring 29, and the contact plate 28 and the leaf spring 29 form a film peeling member.

The upper edge of the place where the package 19 of the two-fold band-shaped film 2A is accommodated is the heat sealing member.
The cylinder 24 is operated in a state where it is located between 23 and 23A, whereby the heat sealing member 23A moves forward while compressing the coil spring 27 and is elastically pressed against the heat sealing member 23, so that the two-fold band-shaped film 2A Heat sealing is performed in a state where the upper end edges are resiliently sandwiched by the pair of sandwiching members 25, 25A, thereby forming a bag as the tubular film 2B. In this case, the contact plate 28 of the film peeling member comes into contact with the heat seal member 23, and the leaf spring 29 is compressed. For this reason, the contact plate 28 is restored and moved forward by the retreat of the heat sealing member 23A, so that the tubular film 2B is instantaneously separated from the heat sealing member 23A.

Reference numerals 30 and 31 denote a pair of feed rollers made of an elastic material provided on the front and rear ends of the lower surface of the upper plate 22, respectively. The feed rollers 30 and 31 sandwich the folded two-fold film 2A drawn out of the roll 3 and folded in half. It is sent in a linear direction under pressure. The feed roller 13 and the feed roller 30 are connected to and driven by a motor 32 via a chain and a sprocket 34, and the feed roller 31 is a feed roller.
30 is connected and driven via a belt 35 and a pulley 36 to rotate in synchronization with each other.

Reference numeral 37 denotes a receiving base having a substantially U-shaped cross section disposed along the film advancing path to the front end position of the upper plate 22 through the opening device 16 and the upper sealing device 20 above the machine base 1. The packaged object 19 accommodated in the two-fold band-shaped film 2A slides on the receiving table 37 while being formed into a cylindrical film 2B via the upper sealing device 20 as the film 2 advances.

Reference numeral 38 denotes a rear sealing / cutting device provided in front of the front ends of the receiving table 37 and the upper plate 22. The rear sealing / cutting apparatus 38 is provided at left and right ends of the machine base 1 in a direction orthogonal to the traveling direction of the tubular film 2B. The plates 39 are erected, cylinders 40 and 41 are mounted horizontally inside each receiving plate 39, and guide rails 42 are respectively installed on the front and rear sides of the upper part between the left and right receiving plates 39 and the front side of the lower part. ing. A pair of moving bodies 43 and 44 are slidably provided on the guide rail 42. The cylinders 40, 41 constitute means for pushing the moving bodies 43, 44.

A cutter 46 is mounted on one of the moving bodies 43 via a rail 45 so as to be able to advance and retreat, and a clamping portion 47 is provided on the rear side of the inner surface of the moving body 43. Is provided with an entrance 48 of a cutter 46, and a heat seal portion 49 is provided on the front side of the moving body 43, respectively. A pair of upper and lower guide rods 50 project from the outer surface of the cutter 46, and a second coil spring 51 is wound around the guide rods 50. Is slidably fitted to the guide rod 50, and the pushing member 52 is prevented from coming off by a locking member 53 fixed to an end of the guide rod 50.

Further, on the rear side of the moving body 43, a bag mouth temporary sealing portion 54 for sealing a part of the substantially central portion of the tubular film 2B at a position corresponding to the bag mouth of the tubular film 2B is provided. I have.

A contact plate 55A is provided integrally with a leaf spring 55 on the front surface of the moving body 43, that is, on the side portion of the heat sealing portion 49. The leaf spring 55 and the contact plate 55A allow the film peeling member. Is formed.

A cooling water circulation path 56 is formed in the moving body 43. Cooling water is supplied to the circulation path 56 from a water supply pipe 57 by a pump (not shown) and circulates through the circulation path 56. It is discharged from 58.

The other moving body 44, which is provided in opposition to the one moving body 43 in a pair, is mounted on a cylinder 41, and a pressing portion opposing the pressing portion 47 is provided on the rear side of the inner surface thereof. 47A is provided, an insertion groove 59 for the cutter 46 is provided in the center, a heat seal portion 49A is provided on the front side facing the heat seal portion 49, and a rear portion is provided. A bag opening temporary fixing seal portion 54A is provided opposite to the bag opening temporary fixing seal portion 54, and the upper and lower guide rails 42 are located between moving bodies 43 and 44, and are provided by the second coil spring 51. A first coil spring 60 having a weak urging force is wound.

Then, the cylindrical film 2B is further advanced by a predetermined length from the front end of the receiving table 37 by means to be described later, and the rear end of the upper heat sealing portion 61 of the cylindrical film 2B corresponds to the rear sealing / cutting device 38. The cylinders 40 and 41 operate in a state where the state has been reached. As a result, both moving bodies 43, 44
Is a belt-shaped tubular film 2B which is brought out to the front side of the cutter 46 in a state where it is abutted via the tubular film 2B and is sandwiched by the pair of pressing portions 47, 47A at the rear side position of the cutter 46. Is heat-sealed by the heat-sealing portions 49 and 49A to form a rear heat-sealed portion 62, and the cutter 46 immediately advances against the bias of the second coil spring 51 and is inserted into the insertion groove 59 so that the rear heat-sealed portion is formed. It is cut from the rear part of the seal portion 62, and the bag is manufactured in a state in which the article to be packaged 19 is accommodated in this manner. In this case, the contact plate 55A serving as a film peeling member is in contact with the inner surface of the moving body 44 with the leaf spring 55 compressed.

Simultaneously with the formation of the vertical rear heat seal portion 62 of the tubular film 2B, the tubular film 2B is cut by the cutter 46 by the pair of bag opening temporary fixing seal portions 54, 54A in association with the operation of the moving bodies 43, 44. A temporary fixing seal portion 62A is formed by heat sealing at a part of the center of the film end corresponding to the bag mouth of the next tubular film 2B.

Thereafter, when the pistons of the cylinders 40 and 41 are retracted, the moving bodies 43 and 44 and the cutter 46 return by the restoring force of the first and second coil springs 60 and 51, and constitute a part of the film peeling member. The contact plate 55A moves forward by the restoring force of the leaf spring 55, and the bag 2C cut and formed from the bag is instantaneously detached from the heat seal portion 49.

Further, since cooling water is circulating in the moving body 43, it is possible to prevent the heat seal portion 49 and the bag mouth temporary fixing seal portion 54 from being abnormally heated.
Can be prevented beforehand, and good sealing can be performed. Further, cutting and heat sealing of the tubular film 2B may be performed simultaneously, or either cutting or heat sealing may be performed first, and this may be arbitrarily selected.

Reference numeral 63 denotes a tensioning device for the cylindrical film 2B,
In this case, a support plate 4B is erected at the front end of the machine base 1, and a pair of left and right guide rails 64 are mounted between the support plate 4B and the upper plate 22 along the film advancing direction.
A sliding body 65 is provided slidably. A pivot 67A is provided on the rear side of the sliding member 65 by the operation of the cylinder 68.
A pair of sandwiching members 67 which are opened and closed via the intermediary member are provided. A cylinder 66 is provided on the upper plate 22 as a driving means for moving the sliding body 65 along the film advancing direction, and a movable element 69 is connected to the piston.
Are slidably provided on the left guide rail 64. Further, one end of a wire 70 is fixed to the sliding body 65, and the wire 70 is guided by a pulley 71 provided at the front end of the machine base 1 and hangs down below the front end of the machine base 1, and has a balance weight 72 at its end. Is provided.

Then, in a state where the front end of the tubular film 2B is fed by the feed rollers 13, 30, 31 to a position protruding from the front end of the receiving table 37, the feeding of the tubular film 2B is stopped, and the operation of the cylinder 66 is started. The piston shrinks,
Accordingly, the sliding body 65 having the sandwiching member 67 is pushed by the mover 69 and moves rearward against the pulling force of the balance weight 72 due to its own weight. Are located on the left and right sides of the end of the film 2B. here,
The holding member 67 is closed by the cylinder 68 to hold the tubular film 2B, the feeding of the tubular film 2B is started, and the fluid in the cylinder 66 is drained. Wire by pulling force
It moves forward through 70, and stops feeding of the tubular film 2B in a state where the article to be packaged 19 has reached a predetermined position, that is, a position near the rear heat seal portion 62.

In this manner, the rear sealing / cutting device 38 operates in a state where the tubular film 2B is pulled and tensioned by the tensile force of the balance weight 72 by its own weight.
When the rear heat sealing and the film cutting of the tubular film 2B guided and pulled out are performed, the formed bag 2 is formed.
C is separated from the tubular film 2B, and further moves forward with the movement of the sliding body 65 due to the tensile force of the balance weight 72. In this case, there is a tray below which is described below the bag 2C, and the bag 2C is placed on the tray.

Reference numeral 73 denotes the twisting and the front portion of the end portion of the bag which is constituted by using a part of the bag proposed by the applicant in Japanese Utility Model Laid-Open Nos. 59-35307 and 59-35308. This is a sealing device, which has an endless conveyor 74 provided corresponding to the transfer position of the bag 2C and circulating in a direction orthogonal to the film advancing direction. A pair of front and rear endless chain belts 77A is mounted between the conveyor 74, a sprocket 76 driven by a motor 75, and a sprocket 77 on the driven side.
A is equipped with a tray 78 composed of a plurality of transfer members at equal intervals. Further, a heat seal member 80 having a cylinder 79 and another heat seal member 81 are provided in a pair at the front of the right transfer end of the tray 78, and the opening and closing operation of the cylinder 82 A plurality of clamping claws 86 are provided, which are rotated by a rack 84 that moves up and down by a cylinder 83 and a pinion 85.

A pair of left and right return guide plates 87, which are return guide members, are horizontally disposed corresponding to the upper portion of the tray 78 on the film traveling path, and the left return guide plate 87 is a cylinder 87A.
Is provided so as to be movable left and right. Also saucer 78
A deaeration member 89 made of a sponge or the like that moves up and down by a cylinder 88 is provided above the right transfer end.

Then, the bag 2C accommodating the article to be packaged 19 is drawn out and guided onto the tray 78, and after the end of the bag 2C is released, the conveyor 74 is driven and sent to the right, and the cylinder 87A is moved. Operation of the left turn guide plate 87
Moves. As a result, the excess portion at the top of the bag 2C is transported to the right by the pan 78 while being folded leftward by the folding guide plate 87, and stops at the location corresponding to the heat seal members 80 and 81. The deaeration member 89 is lowered by the operation to deaerate the inside of the bag 2C, and the surplus front portion of the bag 2C is pinched and twisted by the pinching claws 86 by the operation of the cylinders 82 and 83, and thereafter, By the operation of the cylinder 79, the front heat seal portion 90 is formed by the heat seal members 80 and 81, and a three-side sealed product is obtained. Then, the product is discharged by the tray 78 being turned by the operation of the conveyor 74.

Next, the operation of the present embodiment having the above configuration will be described. First, the belt-shaped film 2 is pulled out from the roll 3, passed through the guide roll 14 and the tension roll 15, and then formed into a two-folded belt-shaped film 2A from the rear surface of the bending member 6 along the tapered surfaces 7 on both sides. The feed roller 30 is guided between the front feed rollers 13 and further along the outer surfaces of the pair of left and right opening guide plates 17 on the receiving table 37.
It is set in a state where it is sandwiched between the feed rollers 31 after the bag is formed on the cylindrical film 2B via the upper sealing device 20 and then sandwiched.

Here, when the apparatus is driven, the motor 32 detects a colored portion or the like printed on the film at equal intervals by a sensor (not shown), and feeds the two-fold band-shaped film 2A by the feed rollers 13, 30, 31 one by one. The motor 75 is driven intermittently at a feed pitch corresponding to the length of the bag 2C.
It is configured to intermittently drive by detecting a limit switch (not shown) at a feed pitch for transferring to a position corresponding to 73.

Then, the belt-shaped film 2 is intermittently pulled out from the roll 3 by a predetermined length by the rotation of the feed rollers 13, 30, 31. The film 2 is folded in two by the bending member 6, and the two-fold is formed. The strip film 2A is a pair of left and right opening guide plates between the feed roller 13 and the feed roller 30.
An opening 18 is formed at the top along 17 and stops. In this state, the to-be-packaged material 19 such as enoki mushroom is manually inserted from the opening 18 into the two-fold band-shaped film 2A in accordance with a mark (not shown) marked on the receiving table 37.

Next, the two-fold band-shaped film 2A is advanced intermittently by the feed rollers 13, 30, 31 and the to-be-packaged object 19 slides on the receiving table 37 and is mounted on the upper plate 22 by the upper sealing device.
The film progress stops in a state corresponding to 20. here,
When the cylinder 24 operates, the heat sealing member
23A and the squeezing member 25A advance toward the heat sealing member 23 and the squeezing member 25 against the bias of the coil spring 27, and the opening edge of the two-fold band-shaped film 2A on the top of the packaged object 19 is the squeezing member. The upper heat-sealed portion 61 is formed by being heat-sealed by the heat-sealing members 23 and 23A in a state of being sandwiched by 25 and 25A, whereby a bag is formed as the tubular film 2B.

At this time, the contact plate 28 constituting the film peeling member abuts on the pinching member 25 side via the leaf spring 29, and then the contact plate 28 is pressed while the leaf spring 29 is compressed. It is urged by the side. As the piston of the cylinder 24 contracts, the heat sealing member 23A and the pinching member 25A recede due to the restoring force of the coil spring 27, and the abutting plate 28 constituting the film peeling member is heated by the restoring force of the leaf spring 29.
The film 2 can be detached from the heat seal member 23A by projecting further from the front surface of the heat seal member 23A, so that the film 2 does not adhere to the heat seal member 23A.
The next step, that is, the supply operation of the tubular film 2B containing the articles to be packaged, can be stably maintained.

Next, the packaged object 19 is accommodated by the intermittent progression of the film, and the front end of the cylindrical film 2B on which the upper heat seal portion 61 is formed is the upper plate 22 and the feed roller.
When the film reaches the position protruding from 31, the film progress stops. Here, the cylinder 66 operates to move the sliding body 65 via the mover 69 rearward along the guide rail 64 while resisting the load of the balance weight 72, and the cylinder 68
The clamping member 67 is closed by the operation of
Hold the front end of B.

Next, the film advance is started, and the fluid of the cylinder 66 is released, and the tubular film 2B is sandwiched by the sandwiching member 67 at the front end of the tubular film 2B by the load of the balance weight 72 via the wire 70 and the sliding body 65. Is pulled forward. Thereafter, when the advance of the film is stopped, the tubular film 2B pulled out is held in a tensioned state by a tensile force caused by the load of the balance weight 72.

Next, the cylinder 4 of the rear sealing / cutting device 38
When 0 and 41 operate, the pair of left and right moving bodies 43 and 44 is pushed toward the center side along the guide rails 42 against the bias of the first coil spring 60, and is moved to the rear end of the article 19 to be packaged. The adjacent cylindrical film 2B is vertically sandwiched and sealed. In this case, the film 2B is sandwiched by the pair of left and right sandwiching portions 47, 47A, and the front side of the sandwiched portion is heat-sealed 49, 49A.
A heat seal portion 62 is formed by heat sealing to form a rear heat seal portion 62 of the tubular film 2B.
The cutter 46 is pushed against the bias of
Reference numeral 46 denotes the pinching portions 47, 47A and the rear heat sealing portions 49, 49.
The tubular film 2B is cut between A and inserted into the insertion groove 59.

A rear heat sealing portion 62 of the tubular film 2B is formed with the operation of the pair of moving bodies 43 and 44.
The rear of the rear heat seal portion 62 is cut by the cutter 46, and at the same time, the pair of bag mouth temporary seal portions 54, 54A are cut.
A portion of the substantially central portion corresponding to the bag mouth portion of the next tubular film 2B cut by the heat treatment is heat-sealed to form a temporary fixing seal portion 62A.

A contact plate 55 constituting a film peeling member
A contacts the heat seal portion 49A while compressing the leaf spring 55. Next, with the contraction of the pistons of the cylinders 40 and 41, the pair of left and right moving bodies 43 and 44 and the cutter 46
At the same time when the film 2 returns with the restoring force of 51 and 60, the abutment plate 55A of the film peeling member returns with the restoring force of the leaf spring 55, so that the film 2 easily comes off from the heat sealing portion 49, and the cut bag 2C Does not adhere to the heat seal portion 49, and the subsequent step of transferring the bag 2C can be performed favorably.

As a result, the bag 2C accommodating the to-be-packaged object 19 cut and formed by the two-side seal is further clamped by the clamping member 67 by the pulling load of the balance weight 72, and at a predetermined position, ie, the receiving tray. It is transported to a position where it is placed on 78, and then the holding member 67 is opened.

During the time until the bag 2C is transferred and placed on the receiving tray 78, that is, when the bag 2C is transferred to the receiving tray 78 while the bag mouth of the bag 2C is pinched and pulled by the holding member 67, Even if the to-be-packaged article 19 accommodated therein is bulky, a part of the substantially central portion of the bag mouth is heat-sealed by the temporary fixing seal portion 62A to suppress the spread of the bag mouth. The bag 2 </ b> C can be placed on the tray 78 in a stable state without being caught by the tray 78.

Next, in a state where the film advance is stopped, the motor 75 operates to drive the conveyor 74, and the cylinder 87A operates to return the upper surplus portion of the bag 2C via the return guide plate 87. The receiving tray 78 on which the bag 2C containing the article to be packaged 19 is transferred to a position corresponding to the front sealing device 73 and stopped.

At this time, since the bag mouth portion is prevented from being squeezed and spread by the temporary fixing seal portion 62A, the upper surplus portion of the bag 2C can be stably turned back by the turning guide plate 87 serving as a turning member. Becomes

In this state, the deaeration member 89 is lowered by the operation of the cylinder 88 to deaerate the inside of the bag 2C.
By the operation of 2, 83, the excess portion at the front of the bag 2C is
Then, the heat seal member 80 is lowered by the operation of the cylinder 79, and the front heat seal portion 90 is formed, whereby a product is obtained. At this time, since the bag mouth portion is suppressed from spreading by the temporary fixing seal portion 62A,
The bag 2 in the proper state folded by the folding guide plate 87
The bag mouth portion of C, that is, the entire front excess portion can be twisted while being stably sandwiched by the sandwiching claws 86, and then heat-sealed at a predetermined position by the heat sealing members 80 and 81. This makes it possible to improve the packaging form of the packaged object 19 in the bag 2C.

Further, the packaged product is automatically discharged when the tray 78 turns downward as the conveyor 74 is driven.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in this embodiment, only one temporary sealing portion is provided at a portion of the substantially central portion of the bag mouth of the bag 2C, but two or one portion may be provided at substantially the center of the bag mouth. The temporary sealing portion may be formed with a certain width in the vertical direction, or the temporary sealing portion may be formed on a part of the bag mouth portion along the width direction of the bag.

In the embodiment shown in the present invention, the bag mouth temporary fixing seal portions 54, 54A are attached and fixed to the moving members 43, 44 together with the heat sealing portions 49, 49A, and the opening and closing operations of the moving members 43, 44 are performed. Synchronously and interlocked, the bag mouth temporary sealing parts 54, 54
A and the heat seal portions 49, 49A are configured to be driven. However, the cylinders may be individually provided and operated in conjunction with each other. The heat sealing operation by the stop seal portions 54 and 54A may be performed simultaneously or may be preceded by either heat sealing.

Further, in the above-described embodiment, the bag mouth temporary sealing portions 54 and 54A and the heat sealing portions 49 and 49A are formed by providing a heat sealer so as to face each pair. Depending on the structure of the part, a pressure-bonding surface may be formed on one side, and a heat-sealing part may be provided on the other, and the film may be heat-sealed by pressing the pressure-bonding surface and the heat-sealing part.

According to the present invention, both ends of the strip-shaped film are folded in two by a two-folding device while continuously pulling out the heat-sealable strip-shaped film forward, and both ends of the strip-folded film are pulled out and guided upward. An object to be packaged is accommodated in the two-folded band-shaped film, the upper part of the two-folded band-shaped film is sealed to form the film into a tubular shape, and the front end of the tubular film in the traveling direction is sandwiched by a bag. The tubular bag is guided and pulled out, and the rear portion of the tubular film is sealed and cut by the rear sealing / cutting device, and the cut bag is placed on the substantially U-shaped tray by the bag feeding device. The tray is transported in the width direction of the bag, and the upper edge of the bag is folded back along the upper portion of the bag along the lower part of the folding member provided in the middle of the transport. In a packaging device in which a bag mouth portion of a folded bag is twisted and then sealed by a bag mouth heat sealing member, the bag device operates in conjunction with the rear sealing / cutting device, and is opposed to a film drawing direction. A bag opening temporary fixing seal portion for sealing a part of the substantially central portion of the tubular film is provided at a rear portion of the rear sealing / cutting device which is a side, so that the tubular film is received by the bag sandwiching feeding device. When guided upward, a temporary fixing seal portion is formed at a part of the central part of the bag mouth, so that the bag mouth can be prevented from spreading, and can be guided stably to the receiving tray. By preventing the edge of the bag mouth from being lifted up by the sealing portion, it is possible to satisfactorily turn the upper edge, which is the surplus portion of the bag in the next process, and to twist the bag mouth and operate the sealing process. To There is an effect that can be kept constant.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a packaging device according to a first embodiment of the present invention.

FIG. 2 is an overall vertical sectional view of the packaging device showing the first embodiment of the present invention.

FIG. 3 is an overall plan view of the packaging device showing the first embodiment of the present invention.

FIG. 4 is a perspective view showing a film folding device and an opening device according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing the upper sealing device of the first embodiment of the present invention.

FIG. 6 is a perspective view showing a rear sealing device and a bag mouth temporary sealing portion showing the first embodiment of the present invention.

FIG. 7 is a sectional view showing a rear sealing / cutting device and a bag mouth temporary sealing portion according to the first embodiment of the present invention.

FIG. 8 is a perspective view showing a rear sealing and cutting device according to the first embodiment of the present invention.

FIG. 9 is a perspective view showing a tension device according to the first embodiment of the present invention.

FIG. 10 is a perspective view showing a film folding, deaerating and twisting sealing device according to the first embodiment of the present invention.

FIG. 11 shows the first embodiment of the present invention, and FIGS. 11 (A) to 11 (C) are schematic explanatory diagrams showing a packaging process of a tension device, a rear sealing / cutting device, and a bag mouth temporary sealing portion.

FIG. 12 is a schematic explanatory view showing a film folding and packaging step of the first embodiment of the present invention.

FIG. 13 is a schematic explanatory view showing a packaging process of the bag deaeration and twist sealing device of the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine stand 2 Strip film 2A Folded strip film 2B Cylindrical film 2C Bag 19 Envelope 20 Top seal device 23 Heat seal member 23A Heat seal member 38 Rear seal / cutting device 46 Cutter 49 Heat seal portion 49A Heat seal portion 54 Bag opening temporary sealing part 54A Bag opening temporary fixing seal part 61 Upper heat seal part 62 Rear heat seal part 62A Temporary seal part 63 Pulling device 67 Nipping member 78 Receiving tray 80 Heat sealing member 81 Heat sealing member 86 Nipping claw 87 Folding guide plate (Folding guide member) 89 Deaeration member 90 Front heat seal part

Claims (1)

(57) [Claims] 1. While pulling out a heat-sealable band-like film continuously forward, both ends of the band-like film are folded in two by a two-fold device, and both ends of the two-fold band-like film are pulled out and guided upward. The object to be packaged is accommodated in the two-fold band-shaped film, and the upper part of the two-fold band-shaped film is sealed to form the film into a cylindrical shape, and the front end of the cylindrical film in the traveling direction is pinched by the bag pinching feed device. The rear part of the tubular film is sealed and cut by the rear sealing / cutting device, and the cut bag is guided onto the substantially U-shaped tray by the bag sandwiching / feeding device. Then, the tray is transferred in the width direction of the bag, and the upper edge of the bag is folded back along the upper portion of the bag along the lower portion of the folding member provided in the middle of the transfer. In a packaging device in which the bag mouth portion of the bag is twisted and then sealed with a bag mouth portion heat sealing member, the bag device operates in conjunction with the rear sealing / cutting device, and on the side opposite to the film drawing direction. A packaging device, characterized in that a bag mouth temporary sealing portion for sealing a part of a substantially central portion of the tubular film is provided at a rear portion of a rear sealing / cutting device.