JP4999726B2 - Vertical bag making and filling machine - Google Patents

Description

  The present invention relates to a vertical bag making filling packaging machine for producing a packaging bag having a square bottom such as a gusset bag.

Conventionally, as a vertical bag making filling and packaging machine for manufacturing a packaging bag having a square bottom, for example, there is one described in Patent Document 1 below.
In this vertical bag making and filling machine, a sheet-like film is conveyed along a bag making tube to be formed into a substantially cylindrical shape, and both ends of the film are vertically sealed with a vertical sealer to form a cylindrical film. In addition, conveyance is performed by delivering in the state which pinched | interposed the film on a bag making tube from both sides with the delivery belt.
The cylindrical film is formed into a rectangular tube shape by passing a bag-forming tube formed in a rectangular tube from the middle, and the bag is formed from the top opening into a cylindrical film having a square bottom and a bottom seal portion preceding this. Fill contents through tube.
Then, the tubular film is moved intermittently to fold and form the square bottom in the subsequent tubular film with a gusset folding triangular guide, a gusset folding vertical guide, a heater block, etc. The upper opening of the cylindrical film having the bottom is heated and sealed with a horizontal sealer having a pair of heater blocks to form a horizontal seal portion.
Next, the upper seal portion and the bottom seal portion are separated by cutting the middle of the horizontal seal portion with a cutter to form a square bottom bag filled and sealed with the preceding contents. By repeating this, square-bottom bags filled with the contents can be manufactured sequentially.
Therefore, in such a vertical bag making filling and packaging machine, the square bottom and the bottom seal portion of the square bottom bag, which is a gusset bag, are formed by the gusset folding triangular guide and the gusset folding vertical guide and the heater block.
JP 2003-200908 A

  However, in the vertical bag making and filling and packaging machine described in Patent Document 1, the horizontal seal portion of the cylindrical film is formed by closing the pair of heater blocks substantially simultaneously with the formation of the square bottom. The contents in the middle of dropping, etc. may be sandwiched between the heater blocks and remain on the side seal portion of the square bottom bag. In such a case, there is a problem in that the quality of the square bottom bag may be deteriorated, for example, the strength of the seal is lowered or the quality of the seal is inferior because the powder is sandwiched between the horizontal seal portions.

  In view of such circumstances, the present invention is a vertical bag making and filling machine capable of producing a high-quality gusseted square bottom packaging bag by horizontally sealing without leaving contents such as powder particles. The purpose is to provide.

The vertical bag making filling and packaging machine according to the present invention is a vertical type in which a packaging material is formed into a substantially cylindrical shape while being conveyed along a bag making tube, and the cylindrical packaging material is formed into a packaging bag having a square bottom. In a bag making and filling machine, a pair of heater blocks that are opened and closed so as to sandwich a cylindrical packaging material in a direction substantially perpendicular to the conveying direction and laterally sealed, and a heater disposed above the heater block A pair of blocking members that move closed in conjunction with the closing movement of the block and sandwich the cylindrical packaging material, and are disposed above the pair of blocking members and move closed in conjunction with the blocking member to form a cylindrical shape A triangular guide that forms a square bottom in the packaging material, a vertical guide that is disposed below the pair of heater blocks, moves closed in conjunction with the triangular guide to form a square bottom in the cylindrical packaging material, and a heater block Equipped with a moving mechanism that opens and closes the blocking member integrally or individually. Have been, the heater block, a protruding portion protruding blocking member side to a position close to the top of the triangular guide moved to the closed position is provided, the blocking member to form a notch so as not to interfere with the projecting portion The heater block and the blocking member are closed and moved by the moving mechanism, and the cylindrical packaging material is laterally sealed by the heater block after a predetermined time has elapsed after the blocking member sandwiches the cylindrical packaging material. And
According to the vertical bag making and filling machine of the present invention, the heater block and the blocking member are closed and moved by the moving mechanism, and the square bottom is formed in the cylindrical packaging material by the blocking member, the triangular guide and the vertical guide, and a pair of blocking is performed. By sandwiching the cylindrical packaging material between the members, the contents can be prevented from flowing in the cylindrical packaging material to the heater block side, which is the downstream side, and the heater block is connected to the pair of blocking members. Since the cylindrical packaging material is horizontally sealed with a predetermined time delay, the contents remaining in the cylindrical packaging material between the heater blocks can be dropped before the horizontal seal, and then the pair of heater blocks By sandwiching the wrapping-like packaging material and performing horizontal sealing, the contents do not remain in the horizontal seal portion, and a high quality gusseted square bottom packaging bag can be formed.
Further, in the manufactured packaging bag, the blocking member holds the cylindrical packaging material between the square bottom formed by the blocking member, the triangular guide, and the vertical guide and the bottom seal portion on the downstream side during the manufacturing. However, when the packaging bag is opened, when the packaging bag is transported or stored, etc., it can be heated and sealed to the position close to the top of the triangular guide in the closed position at the protruding portion. In addition, the square bottom can be prevented from being deformed or collapsed.

The pair of blocking members protrudes forward in the closing movement direction of the heater block located on the same side with respect to the bag-making tube, and the upper surfaces of the bag-making tube side are formed in the same plane and the moving mechanism It is preferable that the gap between the blocking member and the heater block is kept constant until the blocking member reaches a position where the blocking member sandwiches the cylindrical packaging material. .
Since the pair of blocking members are formed in the same plane and the interval between the blocking member and the heater block is not changed until the blocking member sandwiches the cylindrical packaging material by the elastic member, the cylindrical blocking material is formed. The gusset square base can be formed in an accurate shape with a good balance and symmetric in the horizontal direction.
The pair of blocking members are connected to stoppers that can contact each other. When the pair of stoppers are in contact with each other, the pair of blocking members are located at a position between which the cylindrical packaging material is sandwiched. A slight gap through which air flows may be provided in the packaging material.
When the blocking member and the heater block are closed and moved in order to form a square bottom in the cylindrical packaging material and form a horizontal seal portion, the stoppers first come into contact with each other, and at this stage, the pair of blocking members have a slight gap. The cylindrical packaging material is held in a state where the heater block is laterally sealed by the pair of heater blocks at the stage where the heater block forms the horizontal sealing portion with the cylindrical packaging material sandwiched after a predetermined time. Air for reducing the volume of the packaging bag can be escaped through the gap between the pair of blocking members, and the entire region can be laterally sealed by heat sealing without containing air.

Moreover, it is preferable that the front end surfaces of a pair of blocking members forming a slight gap are formed in a stepped shape having a horizontal portion.
As a result, even if a small amount of content falls in the gap from the upstream side of the blocking member, it can be collected in the horizontal portion and does not fall on the horizontal seal portion.

According to the vertical bag making and filling machine according to the present invention, the contents such as the granular material remaining in the cylindrical packaging material between the pair of heater blocks are sealed by the pair of blocking members before the horizontal sealing. It can be dropped in a state where the material is sandwiched, and since the contents do not remain when the cylindrical packaging material is laterally sealed with the heater block, the contents remain on the lateral seal portion and are not sealed. The quality of the produced packaging bag is high. In addition, since the cylindrical packaging material is sandwiched between the pair of blocking members positioned on the upstream side of the heater block with respect to the cylindrical packaging material, it is possible to perform horizontal sealing while suppressing the subsequent fall of the contents.
Furthermore, the heater block is provided with a protruding portion that protrudes toward the blocking member side to a position close to the top of the triangular guide that has moved to the closed position, and the blocking member is formed with a notch so as not to interfere with the protruding portion. In the manufactured packaging bag, between the square bottom formed by the blocking member, the triangular guide, and the vertical guide and the bottom seal portion on the downstream side, the blocking member sandwiches the cylindrical packaging material at the time of manufacturing. A gap is formed, but it can be heated and sealed to the position close to the top of the triangular guide in the closed position at the protrusion, so when opening the packaging bag, transporting and storing the packaging bag, etc. It is possible to suppress the corner bottom from being deformed or collapsed.

Hereinafter, a vertical bag filling and packaging machine according to an embodiment of the present invention will be described with reference to FIGS.
1 is a schematic configuration diagram of a vertical bag making filling and packaging machine, FIG. 2 is a plan view showing a mechanism for moving a horizontal sealer and a blocking plate, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. FIG. 5 is an enlarged view of a portion B in FIG. 4 in a state where the cylindrical film is horizontally sealed with the heater block of the horizontal sealer shown in FIG.
First, before describing the vertical bag making and filling machine 1, the packaging bag, that is, the square bottom bag F manufactured by the vertical bag making and filling machine 1 will be described with reference to FIG.
6 (a), 6 (b), and 6 (c) show a square bottom bag F that is a gusset bag. 6A is a cross-sectional view taken along line CC of FIG. 6B, FIG. 6B is a front view of the square bottom bag F, and FIG. 6C is a side view.
In the square bottom bag F shown in FIG. 6, the square bottom 101 has a quadrangular planar shape, and the bottom seal portion 102 at the center is bent to the square bottom 101 after sealing. Formed by opposing front surfaces 103 having the same width extending upward from each side of the bottom 101, a back surface 103 ′ having a vertical seal portion 106, and side surfaces 104, 104 gradually narrowing from the bottom 101 to the upper end. Has been.
The upper part of each side surface 104 is folded inside the front surface 103 and the back surface 103 ′, and the upper end openings of the front surface 103 and the back surface 103 ′ are flattened and sealed to form the upper seal portion 105.

Next, the vertical bag making filling and packaging machine 1 will be described with reference to FIG.
In the vertical bag making and filling machine 1 shown in FIG. 1, for example, a bag making tube 2 having a substantially circular cross section (which may be a substantially square cross section) is arranged in the vertical direction, and a rectangular tube forming section having a square cross section is provided at the lower end side. 2a is formed. A hopper (not shown) is provided at the upper end of the bag-making tube 2 to supply contents such as powder particles to be filled in a square-bottom bag F as a packaging bag for bag making. A bag making guide 3 is attached below the hopper. Between the outer peripheral surface of the bag-making tube 2 and the inner peripheral surface of the bag-making guide 3, a substantially circular space in plan view through which the film f (packaging material) passes is provided.
Here, the square tube forming portion 2a is formed by four substantially triangular plane portions 2b that extend upward (from the hopper direction) from the four sides forming the rectangular opening at the lower end to form the top portion, and The shape changes from a square tube to a cylinder from the lower end upward.

A film reel 4 for winding a sheet-like film f is provided on the side of the bag making tube 2, and the film f fed out from the film reel 4 is bent by a bag making guide 3 and Is formed into a cylindrical shape through a space between the two, and is folded into a substantially rectangular tube shape by a rectangular tube forming portion 2a provided at the lower end of the bag-making tube 2 and further sent downward. In addition, the film f is formed in a substantially cylindrical shape by the bag making guide 3 to be a cylindrical film f1, and both end portions in the width direction are folded on the bag making tube 2 to form a vertical seal portion 106 and conveyed. .
In the bag making tube 2, below the bag making guide 3, the film f formed in a substantially cylindrical shape and conveyed along the outer peripheral surface of the bag making tube 2 is adsorbed to the outer peripheral surface of the bag making tube 2 by air. A pair of feeding belts 6 for feeding and transporting downward is provided. A vertical sealer 7 for heat-sealing the vertical seal portion 106 is provided between the pair of feeding belts 6 and 6.
Further, on the lower side of the square tube forming portion 2a at the lower end of the bag making tube 2, a horizontal sealer 8 is provided for sealing the upper and lower portions of the two square bottom bags F at the same time in the direction perpendicular to the packaging material conveying direction, ie, in the horizontal direction. Yes. The horizontal sealer 8 is composed of a pair of heater blocks 9a and 9b that can be opened and closed in the horizontal direction. Each heater block 9a, 9b is provided with a cutter 10 (see FIG. 4) for cutting the horizontal seal portion into the upper seal portion of the preceding square bottom bag F and the subsequent bottom seal portion of the next square bottom bag F. . The opening / closing movement refers to a movement in the direction of sandwiching the tubular film f1 as a closing movement, and a movement in a direction away from the tubular film f1 is referred to as an opening movement.

Folding members 11 are formed on the upper and lower sides of the horizontal sealer 8 to form the square bottom of the square bottom bag F to be manufactured. The folding member 11 is provided on the downstream side of a pair of gusset folding triangular guides (hereinafter simply referred to as triangular guides) 12 and 12 provided on the upstream side of the horizontal sealer 8 as viewed in the film f conveyance direction, and on the downstream side of the horizontal sealer 8. And a pair of gusset folding vertical guides (hereinafter simply referred to as vertical guides) 13 and 13.
The pair of triangular guides 12 and 12 is, for example, a triangular plate shape that is perpendicular to the opening and closing direction of the horizontal sealer 8 and is movable in the horizontal direction, and the vertical guide 13 is also a substantially L-shaped plate shape in the opening and closing direction of the horizontal sealer 8. It is configured to be openable and closable perpendicularly and horizontally.
Between the horizontal sealer 8 and the triangular guide 12, a blocking member 16 comprising a pair of blocking plates 15 and 15 for folding the lower side of the bottom of the square bag F is provided, and the pair of blocking plates 15 and 15 are Similarly, the heater blocks 9a and 9b of the horizontal sealer 8 are opened and closed in the same direction as the opening and closing directions of the heater blocks 9a and 9b. The pair of blocking plates 15 and 15 are formed in a flat plate shape, for example, and are formed such that at least the upper surfaces thereof are coplanar.

Next, the manufacturing apparatus of the square bottom bag F by the vertical bag making filling and packaging machine 1 will be described with reference to FIGS.
2 and 3, the horizontal sealer 8 is located below the square tube forming portion 2a in the bag-making tube 2 and in a horizontal plane perpendicular to the tubular film f1 formed in a square tube shape fed out from the square tube forming portion 2a. Heater blocks 9a and 9b are disposed on both sides of the tubular film f1 so as to be openable and closable. The heater blocks 9a and 9b are supported by heater brackets 25 and 29 that are opened and closed by a known moving mechanism 20 with the bag-making tube 2 interposed therebetween, and are opened and closed.

As shown in FIGS. 2 to 4, one heater block 9 a has a support block 37 fixed to the upper center of the heater bracket 25, and a slide bush 38 is provided in a pair of through holes provided in the support block 37. It is inserted. A rod-shaped shaft member 39 is inserted into each slide bush 38, and collars 40a and 40b are fixed to the rear end and the middle part of the shaft member 39 with the support block 37 interposed therebetween. The collar 40a at the rear end is a retaining member for the shaft member 39, and a coil spring 41, for example, is interposed as an elastic member between the collar 40b on the front side and the support block 37.
A plate 43 substantially parallel to the heater block 9a is attached to the tips of the pair of shaft members 39, 39, and stoppers 44, 44 are connected to both ends thereof. Between the stoppers 44, 44, the one blocking plate 15 described above is provided.
A shield plate support structure 45B that is symmetrical to the shield plate support structure 45A having such a configuration is provided in the heater bracket 29 that supports the other heater block 9b, and the other shield plate support structure 45b also has one shield plate support structure. The same members as those in 45a are denoted by the same reference numerals and description thereof is omitted.

Here, as shown in FIG. 3, the stoppers 44 and 44 are arranged to protrude forward from the heater blocks 9a and 9b, and the blocking plates 15 and 15 protrude forward from the heater blocks 9a and 9b. However, the stepped tip end surface is at a position slightly retracted from the stoppers 44, 44. Moreover, a slight gap s having a stepped shape is formed on the front end surfaces of the shielding plates 15 and 15 with the opposing stoppers 44 and 44 in contact with each other, as shown in FIG. Distribution is possible.
Further, in the blocking plate support structures 45A and 45B, when the heater brackets 25 and 29 are moved toward each other by the operation of the moving mechanism 20, the stoppers 44 and 44 are moved from the retracted position (open position) indicated by the solid line in FIG. The shaft member 39 is set so as not to move relative to the support block 37 by the urging force of the coil spring 41 until reaching the positions where they are in contact with each other as indicated by the dotted line. Therefore, until the stoppers 44 and 44 come into contact with each other, the gap between the blocking plate 15 and the heater block 9a (9b) is controlled to be the same and closed.
When the moving mechanism 20 is further operated in a state where the stoppers 44 and 44 are in contact with each other, the support blocks 37 and 37 move in a direction to approach the heater brackets 25 and 29 so that the shaft members 39 and 39 are coiled. The spring 41 is compressed against the biasing force and moved to the rear of the support block 37.

The vertical bag making and filling machine 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
First, in FIG. 1, the film f fed from the film reel 4 by the feeding belt 6 is inserted between the bag-making tube 2 and the bag-making guide 3 to be formed into a cylindrical shape. The seal portion 106 is vertically sealed. The cylindrical film f1 that has become a cylindrical shape further descends intermittently on the bag-making tube 2, reaches the square tube forming portion 2a, is formed into a rectangular tube shape, and is further transferred downstream. In this state, the contents are filled through the bag-making tube 2 into the tubular film f1 in which the bottom seal portion 102 is formed and the upper opening is continuous.
And the bottom part and upper opening of two square bottom bags F which should be formed from the cylindrical film f1 are laterally sealed simultaneously, and the square bottom of the square bottom bag F is formed.
That is, when forming the square bottom of the square bottom bag F, the gusset folding triangular guides 12 and 12 and the gusset folding vertical guide 13 positioned above and below the horizontal sealer 8 are formed by the cylinders 34 and 34 in the gusset folding mechanism 32 shown in FIG. The cam rollers 35 are brought into contact with the cam 26 by moving the cams 13 close to each other so as to reduce the distance therebetween.

The pair of heater blocks 9a and 9b of the horizontal sealer 8 are closed from the open state shown in FIG. That is, in FIGS. 2 and 3, when the moving mechanism 20 is driven, the heater bracket 25 is pushed and slides, and the heater block 9a moves in the direction of the tubular film f1. At the same time, the heater bracket 29 is moved, and the heater block 9b is also moved in the direction of the tubular film f1.
Since the cam 26 also moves integrally with the heater bracket 25, the cam roller 35 contacting the cam 26 of the gusset folding mechanism 32 is also interlocked, and the pair of triangular guides 12 and 12 and the vertical guides 13 and 13 are interlocked to form a rectangular tube. It abuts against the two opposing side surfaces 104, 104 of the formed tubular film f1 and pushes it in a substantially V shape from both sides to the inside.

When the heater brackets 25 and 29 are moved in the approaching direction, the pair of heater blocks 9a and 9b of the horizontal sealer 8 are closed and moved together so as to approach each other. The support structures 45A and 45B are also closed and the stoppers 44 and 44 and the blocking plates 15 and 15 approach each other.
At this time, the pair of opposing stoppers 44, 44 are held at a predetermined interval without the shaft members 39, 39 moving relative to the support blocks 37, 37 by the high biasing force of the coil springs 41, 41.
Then, the blocking plates 15, 15 and the triangular guide 12 and the vertical guide 13 are closed and moved together, so that the front surface 103, the back surface 103 'and the side surfaces 104, 104 of the rectangular tube-shaped tubular film f1 are pushed in, The tubular film f1 is pushed into the triangular guides 12 and 12 and folded. As shown by a two-dot chain line in FIG. 3, when the stoppers 44 and 44 come into contact with each other, the blocking plates 15 and 15 are stopped by forming a slight stepped gap s as shown in FIG. To do.

At this time, since the heater blocks 9a and 9b are provided at positions retracted from the stoppers 44 and 44, the area to be heat-sealed by the horizontal sealer 8 of the tubular film f1 is not closed, and the blocking plates 15 and 15 The contents in the tubular film f1 positioned further downward fall without being disturbed. On the other hand, in the cylindrical film f1 sandwiched by the gap s between the blocking plates 15 and 15, a small amount of content is deposited on the horizontal portion s1 of the stepped gap s, and does not fall downward.
Thereafter, when the heater brackets 25 and 29 are further moved in the approaching direction, the support blocks 37 and 37 are further moved in the approaching direction. However, the shaft members 39 and 39 and the collars are provided for the stoppers 44 and 44 in the contact state. 40a, 40a, 40b and 40b are held in a stopped state. For this purpose, the coil springs 41, 41 are compressed against the urging force, and the shaft members 39, 39 and the collars 40a, 40a pass through the slide bushes 38, 38 behind the support blocks 37, 37, that is, opposite to the stopper 44. Relative movement.

At the same time, the heater blocks 9a and 9b are pressed against each other with the horizontal seal portion of the tubular film f1 interposed therebetween (see FIGS. 4 and 5). At this time, the contents have already fallen downward in the horizontal seal portion of the tubular film f1, and the upper content is fastened by the blocking plates 15 and 15, and remains in the horizontal portion s1 in the gap s. There is no stagnation of the contents in the horizontal seal portion of the tubular film f1, and high-precision heat sealing can be performed over the entire region.
Moreover, since the tubular film f1 is pressed by the heater blocks 9a and 9b, the volume in the tubular film f1 is reduced. As the volume decreases, the air passes through the gap s between the blocking plates 15 and 15 and escapes into the upper cylindrical film f1, so that the air is prevented from staying in the horizontal seal portion, and the seal strength is high and high accuracy. Can perform horizontal sealing. Moreover, it can suppress that the square bottom bag F sealed by the upper opening below a horizontal seal part expands excessively.
Thereafter, the horizontal seal portion of the tubular film f1 is divided by the cutter 10 into an upper seal portion 105 and a bottom seal portion 102 of the front and rear square bottom bags F. Then, the square bottom bag F filled and sealed with the preceding contents is manufactured and dropped.

When the sealing of the bottom seal portion 102 by the horizontal sealer 8 is completed, the heater brackets 25 and 29 are moved in the separating direction, and the heater blocks 9a and 9b, the blocking plates 15 and 15 and the stoppers 44 and 44 are opened in the separating direction. . At the same time, by interlocking the cam 35 with the return movement of the cam 26, the triangular guides 12 and 12 and the vertical guides 13 and 13 are moved open in a direction away from each other.
In this way, one cycle of the manufacturing process of the square bottom bag F is completed.

As described above, according to the present embodiment, when the tubular film f1 is laterally sealed, the contents between the heater blocks 9a and 9b fall before the lateral seal. The contents are not sandwiched in the bottom seal portion 102 of the next square bottom bag F, and the quality of the manufactured gusset square bottom bag F is high.
Moreover, before the blocking plates 15 and 15 reach the position where the tubular film f1 is sandwiched, the heater blocks 9a and 9b connected to each other by the coil springs 41 and 41 provided on the shaft members 39 and 39 of the stopper mechanism 45. Since the gap between the shield plates 15 and 15 can be held so as not to change, the relative positions of the shield plates 15 and 15 are constant regardless of the rigidity of the tubular film f1 when forming the square bottom of the tubular film f1. The square bottom can be manufactured evenly in a balanced manner.
Further, since the upper surfaces of the pair of blocking plates 15 and 15 are formed to be on the same plane, the square bottom can be formed symmetrically and accurately in the front-rear and left-right directions. In addition, when the stoppers 44 and 44 come into contact with each other and the blocking plates 15 and 15 are held at the closed position, the stepped fine gap s is formed between the front end surfaces, so that the heater block 9a has a time difference. , 9b can be released through the gap s from the region of the tubular film f1 (square bottom bag F) when closed.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 to 10, and the same or similar parts and members as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.
In the square bottom bag F shown in FIG. 6, the vertical bag making filling and packaging machine 1 described above has a space between the triangular guide 12 entering the tubular film f <b> 1 (square bottom bag F) and the bottom seal portion 102 by the horizontal sealer 8. Since the blocking plate 15 is positioned, the triangular bottom 12 is inserted between the triangular portion 107 of the rectangular bottom 101 where the triangular guide 12 enters and the bottom seal portion 102 heated and sealed by the horizontal sealer 8. Causes a deviation of the distance d2. Therefore, when the square bottom bag F is transported or when the upper seal portion 105 is opened, the space between the bottom seal portion 102 and the triangular portion 107 may be opened, and the accurate shape of the square bottom 101 may not be maintained. is there.
In the vertical bag making and filling machine 1 according to the second embodiment of the present invention, as shown in FIGS. 7 and 8, for example, a triangular cross section is provided on the upper surface of each heater block 9a, 9b in order to further improve such drawbacks. Two protrusions 47 are formed. The protruding portion 47 constitutes a part of the contact surface of each heater block 9a, 9b, and the protruding portion 47 is formed so as to be positioned near the top of the triangular portion 107 of the square bottom bag F shown in FIG.
In addition, when the heater blocks 9a and 9b are opened and closed, the respective blocking plates 15 are arranged in the opening and closing movement direction of the heater blocks 9a and 9b so that the protruding portions 47 do not interfere with the respective blocking plates 15 located above the heater blocks 9a and 9b. A notch 48 is formed (see FIG. 2).
In addition, since the protrusion part 47 should just be located in the top part vicinity of the triangular part 107 of both sides, it may replace with the structure arrange | positioned and may be comprised with the one protrusion part 47 which continued.

Therefore, the square bottom bag F manufactured by the vertical bag making and filling and packaging machine 1 according to the second embodiment in the same manner as the first embodiment is as shown in FIG. In FIG. 9, the bottom seal portion 102 of the square bag F is formed with a projecting seal portion 102 a formed by the projecting portion 47, extending near the top of the triangular portion 107 and sealing. Therefore, the distance d1 between the triangular portion 107 of the square base 101 and the protruding seal portion 102a is smaller than the above-described distance d2.
Therefore, when the square bottom bag F is transported or when the upper seal portion 105 is opened, the projecting seal portion 102a can prevent the gap between the bottom seal portion 102 and the triangular portion 107 from being opened. Shape deformation can be suppressed.

Next, a modified example of the present invention will be described.
In the conventional vertical bag making filling and packaging machine, the horizontal seal portion is heated and sealed with a horizontal sealer and cut into an upper seal portion 105 and a bottom seal portion 102 with a cutter, and then the bottom seal portion 102 is turned to a square bottom 101 by a tilting plate. I was trying to bend it.
In the vertical bag making and packaging machine 1 according to the modification, instead of the above-described configuration, as shown in FIG. 10, the pair of blocking plates 15 and 15 can be opened and closed by individual driving sources. That is, after the horizontal sealing is finished, one of the blocking plates 15 moves backward and opens, and the other blocking plate 15 is moved in the direction of the one blocking plate 15 so that the other blocking plate 15 becomes the bottom seal portion 102. Is bent to the square base 101.

In the vertical bag making and filling machine 1 according to the above-described embodiment, the pair of blocking plates 15 and 15 are moved integrally with the heater blocks 9a and 9b. However, the moving mechanism is separate from the heater blocks 9a and 9b. May be provided to be opened and closed independently. As a result, even if the stopper 44 and the coil spring 41 are not provided, the relative positions of the blocking plates 15 and 15 that are closed when the square bottom is formed have a constant gap s regardless of the rigidity of the tubular film f1. Formed and maintained, a well-balanced square bottom bag F can be formed.
Further, after the pair of blocking plates 15 and 15 form the gap s to sandwich the tubular film f1 and suppress the fall of the contents, the horizontal sealing can be performed by the heater blocks 9a and 9b. The contents do not remain.
Further, the shape of the gap s between the front end surfaces of the pair of blocking plates 15, 15 does not necessarily have to be stepped as shown in FIG. For example, the inclined surface-shaped gap s may be formed with the both end surfaces inclined. In this case, when the stoppers 44 and 44 are brought into contact with each other, the contents may slightly fall from the gap s between the blocking plates 15 and 15, but remain in the region where the heater blocks 9 a and 9 b come into contact and heat seal. Since there is almost no content to do, it is the same that a highly accurate horizontal seal part can be formed.

It is a schematic block diagram of the vertical bag making filling packaging machine by 1st embodiment of this invention. It is a top view which shows the moving mechanism of the horizontal sealer and the shielding board of the vertical bag making filling packaging machine by this embodiment. It is the sectional view on the AA line of FIG. It is a principal part expanded sectional view of the moving mechanism of a horizontal sealer and a shielding board shown in FIG. It is the B section enlarged view of FIG. It shows the square bottom bag obtained with the vertical bag making filling packaging machine by 1st embodiment, (a) is CC sectional view taken on the line of (b), (b) is a front view, (c) is a side view. FIG. It is a partial front view of one heater block in the vertical bag making filling and packaging machine according to the second embodiment. It is a principal part side view which shows the state which carries out the horizontal seal of a cylindrical film with a pair of heater block. It is explanatory drawing which shows the bottom part seal part obtained with the heater block by 2nd embodiment. It is action | operation explanatory drawing of the interruption | blocking board which shows the process of folding back the bottom part seal part by the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical bag making filling packaging machine 2 Bag making tube 8 Horizontal sealer 9a, 9b Heater block 11 Folding member 12 Triangular guide 13 Vertical guide 15 Blocking plate 16 Shutting member 20 Moving mechanism 25, 29 Heater bracket 32 Gusset folding mechanism 38 Slide bush 39 Shaft member 41 Coil spring 44 Stopper 47 Protrusion 48 Notch s Gap f Film (packaging material)
f1 Cylindrical film F Square bottom bag

Claims (4)

In the vertical bag making filling and packaging machine, the packaging material is formed into a substantially cylindrical shape while being conveyed along the bag making tube, and the cylindrical packaging material is formed into a packaging bag having a square bottom.
A pair of heater blocks that open and close and laterally seal so as to sandwich the cylindrical packaging material in a direction substantially perpendicular to the conveying direction;
A pair of blocking members disposed above the heater block and closed in conjunction with the closing movement of the heater block to sandwich the cylindrical packaging material;
A triangular guide that is disposed above the pair of blocking members and moves closed in conjunction with the blocking member to form a square bottom in a cylindrical packaging material;
A vertical guide that is disposed below the pair of heater blocks, and moves in a closed manner in conjunction with the triangular guide to form a square bottom in a cylindrical packaging material;
A moving mechanism for opening and closing the heater block and the blocking member integrally or individually;
The heater block is provided with a protruding portion that protrudes toward the blocking member to a position close to the top of the triangular guide that has moved to the closed position, and the blocking member is formed with a notch so as not to interfere with the protruding portion. And
The heater block and the blocking member are closed and moved by the moving mechanism, and the cylindrical packaging material is laterally sealed by the heater block after a lapse of a predetermined time after the blocking member sandwiches the cylindrical packaging material. A vertical bag making filling and packaging machine. The pair of blocking members protrude forward in the closing movement direction of the heater block located on the same side with respect to the bag making tube, and the upper surfaces on the bag making tube side are formed on the same plane. Closed from the moving mechanism through the elastic member,
2. The vertical bag filling according to claim 1, wherein the elastic member maintains a constant distance between the blocking member and the heater block until the blocking member reaches a position where the cylindrical packaging material is sandwiched. Packaging machine. The pair of blocking members are connected to stoppers that can contact each other,
When the pair of stoppers are in contact with each other, the pair of blocking members are positioned so as to sandwich the cylindrical packaging material, and a slight gap through which air flows is provided in the cylindrical packaging material. Item 3. The vertical bag making filling and packaging machine according to Item 1 or 2.     The vertical bag making filling and packaging machine according to claim 3, wherein the front end surfaces of the pair of blocking members forming the slight gap are formed in a stepped shape having a horizontal portion.

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