JPH072044U - Film forming device with a habit of forming a square tubular bag with gusset and hem - Google Patents

Abstract

(57) [Summary] [Purpose] A gusseted hem that can be installed as an optional device above the carry-in conveyor of the existing normal pillow type horizontal bag-filling and packaging machine and does not require a space larger than the length of the carry-in conveyor. A film forming device that gives a crease like an attached rectangular tube bag. [Structure] A wrapping film F is guided to a former device 10 to give a crease as a square tubular bag with a gusset, and further, it is guided to a hem forming device 20 to weld and form a hem at a base end folding portion of the gusset, and further an unformer. It is guided to the device 30 and developed in a plane. The pull-in roll 22 and the pull-in roll 41 are driven by the servo motor 50, and the pull-in roll 4
1 is rotated by the continuously variable transmission 60 at a slightly higher speed than the tension roll 22. The reference rotation speed of the servo motor 50 is set so as to have the same value as the film drawing speed of the drawing roll 41 and the film filling and packaging machine of the horizontal type, and the reference rotation speed is corrected according to the elevation of the elevating roll 42.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention introduces a packaging film fed from a raw roll mounted on the horizontal bag-making filling and packaging machine, which is positioned so as to straddle the carry-in conveyor of the horizontal bag-making filling and packaging machine. The present invention relates to a film forming apparatus that imparts a crease, which is a square tubular bag with a gusset and a hem, that can be flattened and then developed into a flat shape and can be fed to a former of a horizontal bag-filling and packaging machine with speed synchronization.

[0002]

[Prior art]

 Conventionally, Japanese Patent Publication No. 44571/1984 (Japanese Unexamined Patent Publication No. 58-64927) discloses a device capable of making a square tubular bag with a gusset and a hem.

[0003]

[Problems to be solved by the device]

 According to the above Japanese Patent Publication No. 1-44571 (Japanese Patent Laid-Open No. 58-64927), it is applied to a reverse pillow type horizontal bag-making filling and packaging machine to save space, and a regular pillow type horizontal bag-making filling and packaging machine. Even if applied to a machine, space saving cannot be achieved. Further, according to Japanese Patent Publication No. 1-44571 (Japanese Patent Laid-Open No. 58-64927), it is impossible to equip an existing reverse pillow type horizontal bag filling and packaging machine as an option.

The present invention can be easily installed as an optional device to the existing normal pillow type horizontal bag-filling and packaging machine, and is perfectly synchronized with the packaging film transfer speed of the horizontal bag-making and packaging machine. It can be placed on the carry-in conveyor of the horizontal bag-filling and packaging machine, and can be installed without taking up a space larger than the length of the carry-in conveyor. It is an object of the present invention to provide a film forming apparatus that gives a habit.

[0005]

Means for Solving the Problems The present invention is, as a means for solving the above problems, a packaging film F which includes a former upper plate 11a and a former lower plate 11b in which an upstream side is parallel to each other and a downstream side is inclined toward each other. The former 11 consisting of and is guided so that both edges of the film overlap each other at the width center portion of the former upper surface plate 11a to form a rectangular tube, and is gusset-folded between the upper plate 11a of the former and the lower plate 11b of the former. And the former device 10 that gives a crease to form a square tubular bag with a gusset and the two stretching rolls 21 and 22 along the film transfer direction in a long direction and in a direction orthogonal to the film transfer direction. It has two pairs of heaters 23, 23 spaced apart as required, and the two rolling rolls 24, 24 are separated from the pull-in roll 22 on the downstream side by the heater. The packaging film F is contacted at a distance corresponding to a distance, and the packaging film F is hung from the former device 10 on the two squeezing rolls 21 and 22 so that the width of several millimeters on both side edges of the packaging film F is set by the two pairs of heaters 23 and 23. A hem forming device 20 for heating the welding temperature to a welding temperature while the sandwiched packaging film F slides and pressurizing the heated portion with the compaction rolls 24, 24 to form a hem h by welding at the base end folding portion of the gusset. An unformer top plate, which is provided on the lower side of the former 11 in the opposite direction, and has a gusseted hem-equipped rectangular tube-shaped packaging film F from the hem forming device 20 in which the upstream sides are parallel to each other and the downstream sides are inclined toward each other 31a and an unformer bottom plate 31b are guided so as to wrap around the unformer 31, and the gusset folds are connected to the unformer top plate 31a and the unformer bottom plate. 1b, an unformer device 30 that guides the wrapping film F into a flat shape by guiding it between the plates on the downstream side, a wrapping film F from the unformer device 30 on the lower side, and a lower roll 41 and an upper holding roll. It passes through 46 and hangs down between the pull-in roll 41 and the pay-out roll 42, and the raising / lowering roll 43 is mounted on the hanging portion of the packaging film F. The accumulator configured to correspond to the feeding speed of the packaging film F to the external device by adjusting the speed of the pull-in roll 41 so that the elevating roll 43 is positioned between the two sensors 44 and 45. 40, and the tension roll 22 on the downstream side of the heme forming device 20 is driven by the servomotor 50. The pulling roll 41 of the accumulator 40 is driven by the branching power of the servomotor 50 which is branched and further slightly increased through the continuously variable transmission 60. The pulling roll of the accumulator 40 is driven. The reference rotation speed of the servo motor 50 is set so that the film drawing speed of 41 is the same value as the film drawing speed of the horizontal bag-making filling and packaging machine, and according to the elevation of the elevating roll 42 of the accumulator 40. The present invention provides a film forming apparatus for forming a crease, which is a square tubular bag with a gusset and a hem, in which the reference rotation speed of the servo motor 50 is corrected.

[0006]

[Action]

 The packaging film F is passed through the former device 10, then through the hem forming device 20, further through the unformer device 30, and then through the accumulator 40. It is hung on the bag filling and packaging machine. Then, the transfer of the packaging film F passing through the former device 10 and the hem forming device 20 is performed by the squeeze roll 22 and the compacting roll 24 of the hem forming device 20. The transport of the packaging film F passing through the unformer device 30 is performed by the pull-in roll 41 of the accumulator 40. The pulling roll 22 and the pulling roll 41 are driven by the servo motor 50, and the reference rotation speed of the servo motor 50 is such that the film pulling speed of the pulling roll 41 matches the film pulling speed of the horizontal bag-making filling and packaging machine. Is set as follows. The continuously variable transmission 60 sets the number of revolutions of the pulling roll 41 to be slightly smaller than the number of revolutions of the pulling roll 22, specifically about 1.1 times larger, whereby the packaging film passing through the unformer device 30 is set. The tension of F is secured. The accumulator 40 has a film pulling speed of the pulling roll 41 and a film pulling speed of the horizontal bag-making filling and packaging machine due to the slip generated when the pulling roll 41 pulls the packaging film F and the stretching of the packaging film F 1. When the stroke limit is exceeded, the upper and lower limits of the lift roll 42 are detected by the two sensors 44 and 45, and the reference of the servo motor 50 is detected based on the sensors 44 and 45. The number of rotations is increased or decreased to correct the mismatch between the film drawing speed of the drawing roll 41 and the film drawing speed of the horizontal bag-making filling and packaging machine.

Then, in the former device 10, the packaging film F is brought into close contact with the lower plate 11b of the former, and both sides in the width direction of the packaging film F are folded so as to wrap around the upper plate 11a of the former, and both edges of the film are formed. The upper plate 11a is overlapped at the center. In this case, the packaging film F is folded into a rectangular tube shape in the parallel portion of the former upper plate 11a and the former lower plate 11b, and a portion that is inclined and approaches toward the downstream end of the former upper plate 11a and the former lower plate 11b. Then, the packaging film F is guided so as to enter the valley-folded state between the upper plate 11a of the former and the lower plate 11b of the former by utilizing the fact that the lengths of both sides folded into a rectangular tube shape decrease. Then, the gusset is folded, so that when the gusset comes out of the former upper plate 11a and the former lower plate 11b, the wrapping film F is formed into a flat tubular shape with the gusset. Next, the packaging film F is passed through the heme forming device 20. In the hem forming device 20, the gusseted flat tubular packaging film F is tensioned between the upper squeezing roll 21 and the lower squeezing roll 22, and two pairs of films each having a width of several mm are formed from the film edges on both sides. Are sandwiched between the heaters 23, 23, ... And heated to the welding temperature, and the compaction rolls 24, 24 roll the film edges on both sides to weld them to form the hem h. The hem h is formed at the four corners of the gusseted flat tubular section. Then, the packaging film F is passed through the unformer device 30. In the part of the unformer device 30, the unformer upper surface plate 31a and the unformer lower surface plate 31b enter inwardly with respect to the flat tubular packaging film F with gusset and hem, and the unformer upper surface plate 31a and the unformer upper surface plate 31a At the part of the lower plate 31b of the former which is inclined and separated toward the upstream end, the fold of the gusset that has entered the valley fold state between the upper plate 31a of the lower former and the lower plate 31b of the lower former is eliminated, and the former is removed. In the parallel portion of the upper plate 31a and the lower plate 31b of the unformer, both sides in the width direction of the packaging film F that wraps the lower plate 31b of the unformer are expanded, and the hem h is expanded into a flat shape with four lines. To do. Then, the accumulator 40 feeds the packaging film F, which is developed in a flat shape with the hem h attached, to the horizontal bag-making filling and packaging machine.

[0008]

【Example】

 A film forming apparatus having a gusset and a square tubular bag with a hem according to an embodiment of the present invention for forming a fold is a former apparatus for forming a packaging film F fed from an original roll (not shown) between guide rolls 71 and 72. 10 to give a crease to form a square tubular bag with gussets, and further guide the packaging film F to the hem forming device 20 to weld and form hem at the base end folding portion of the gusset, and further fold the square tubular bag with gussets. The wrapping film F having a habit and having the hem formed by welding is guided to the unformer device 30 between the guide rolls 73 and 74 provided on the lower side of the former device 10 so as to make a U-turn, and is developed in a plane shape. Further, after guiding the wrapping film F having the crease of the square tubular bag with the gusset and having the hem welded to the accumulator 40 after being guided to the accumulator 40, it is not shown in the drawing. The device is configured so as to be guided to the former of a regular pillow type horizontal bag-filling and packaging machine. In this device, a substantially U-shaped plate 2 serving as a substrate is supported by four legs 3, 3, ... The four legs 3, 3, ... Are positioned so as to straddle the carry-in conveyor K of the horizontal bag-making filling and packaging machine, and the packaging film F fed from the original roll is introduced, and the lower part of the heme forming device 20 is stretched. By driving the roll 22 by the servomotor 50, the wrapping film F is unwound from the original fabric roll, and the pull-in roll 41 of the accumulator 40 is diverged from the power of the servomotor 50 to continuously variable transmission. It is driven by branching power whose speed is controlled via 60, and the film feeding speed of the draw-in roll 41 is the film feed speed of the lower draw-in roll 22 of the heme forming apparatus 20. The continuously variable transmission 60 is adjusted so as to be stable at about 1.1 times the feeding speed, and the reference rotational speed of the servo motor 50 causes the horizontal bag-filling and packaging machine to supply the packaging film F fed from the accumulator 40. It is configured to have the same value as the pulling speed and the speed is corrected according to the elevation of the elevation roll 42 of the accumulator 40.

The former device 10 has a former 11 having a former upper surface plate 11a and a former lower surface plate 11b, a pair of rod-shaped film alignment guides 12 and 12, and three pairs of formers. Film pressing rolls 12, 12, 13, 13, 15, 15 and gusset guides 16, 16 are additionally provided. Then, the packaging film F, which is unwound from the original roll (not shown) and wound around the guide roll 71 located at a position higher than the upper plate 11a of the former through the guide rolls 75 and 76, is inclined toward the lower plate 11b of the former. As it descends, it is hung on the lower plate 11b of the former and guided by the film alignment guides 12, 12. The former upper plate 11a and the former lower plate 11b are kept spaced by a former rib 11c, and a former support plate 11d erected on the upper surface of the former upper plate 11a is extended from the bracket 1a of the apparatus frame 1. It is hung down and fixed. The upper front plate 11a and the lower front plate 11b are rectangles that are long in the film guiding direction when viewed in a plane direction, and when viewed from the front, the required middle part is vertically symmetrical and bent in a V shape. The part of the upper plate 11a on the upstream side of the bending direction in the film guide direction and the part of the lower plate 11b of the former on the upstream side in the film guiding direction are horizontally parallel to each other and spaced from each other. The part on the downstream side in the film guiding direction from the bent part of the former upper plate 11a and the part on the downstream side in the film guiding direction from the bent part of the lower plate 11b are required to be close to each other at a narrow angle. , For example, they are inclined at an angle of 20 degrees and are inclined to each other, and the ends are separated by about 2 mm. The pair of rod-shaped film alignment guides 12, 12 are in close contact with the upper surface of the former upper plate 11a, and are provided in a V shape that narrows the downstream side in the film guiding direction when seen in the plane direction. Each of the film pressing rolls 13, 14 and 15 is rotatably supported by roll supporting members 17a, 17b and 17c. The heights of the roll supporting members 17a and 17b can be adjusted to an arm 18a provided on the apparatus frame 1 so as to be located slightly upstream of the bending direction of the former upper plate 11a in the film direction and near the bending position. The distance is adjustable. Then, the film pressing rolls 13 and 13 press the film top guides 11 and 12 so that both widthwise edges of the film, which have been guided by the film alignment guides 12 and 12 so as to wrap the former 11, closely contact the former top plate 11a. The film pressing rolls 14, 14 are designed to draw the film F to the central portion of the face plate 11a to cause it to overlap with each other. ing. The roll supporting member 17c is attached to an arm 18b provided on the apparatus frame 1 so as to be positioned at the downstream end of the former upper plate 1a so as to be height-adjustable and space-adjustable. , 15 are also adapted to press the both edges of the film F in the width direction so as to be in close contact with the former upper plate 11a. The gusset guides 16, 16 are configured such that the shafts of the disks 16a, 16a are pivotally supported by bearings, and the bearings are fixed to a support arm 19 stretched from the apparatus frame 1 so that the distance between the disks 16a, 16a is adjustable. However, only the gusset size is inserted between the inclined portion of the former upper plate 11a and the inclined portion of the former lower plate 11b, and the distance between the upper plate 11a and the lower plate 11b of the former is narrowed to form a rectangular tubular shape. Guide both sides of the film F, which will cause slack, by tensioning them in a valley fold and forming a gusset. Therefore, the film F passed through the former device 10 is folded into a gusseted flat tube shape. The lower end of the guide roll 72 is aligned between the downstream end of the former upper plate 11a and the downstream end of the former lower plate 11b, and the guide roll 72 is passed through the former device 10 and folded into a gusseted flat cylinder. The packaging film F to be guided is guided upward.

In the heme forming apparatus 20, an upper tension roll 21 and a lower tension roll 22 are provided in an upper and lower arrangement, and a rubber roll (rolling roll) 24 is provided so as to rotate under pressure with respect to the lower tension roll 22. Two pairs of heaters 23, 23 are provided between the upper tension roll 21 and the lower tension roll 22. The hem forming device 20 wraps the film F, which is folded into a gusset-containing flat tubular shape by the former device 10, on the upper squeeze roll 21 and then on the lower squeeze roll 22, and uses two pairs of heaters 23 and 23 to gusset the film. The width of 3 to 6 mm is sandwiched between both side edges of the film F 1 folded into a flat tube shape, and the film F 1 is heated to a welding temperature while the film F slides. The rubber roll (rolling roll) 24 rolls under pressure with respect to the lower tension roll 22, and both side edges of the film F folded into a gusseted flat tube heated by the two pairs of heaters 23, 23. 3 to 6 mm width is welded under pressure. The welded portion h having a width of 3 to 6 mm is called a hem.

The unformer device 30 has an unformer 31 having an unformer upper surface plate 31 a and an unformer lower surface plate 31 b, and a pair of rod-shaped film expansion guides 32 with respect to the former 11. , 32, a pair of film pressing rolls 33, 33, and gusset guides 34, 34 are additionally provided. Then, the upper upper plate 31a and the lower lower plate 31b of the former are inserted into the inside of the gusseted flat film wound around the guide roll 73 from the upper side. The upper end is provided so as to coincide between the upstream end of the former upper plate 31a and the downstream end of the former lower plate 31b. An unformer upper plate 31a and an unformer lower plate 31b are kept spaced by an unformer rib 31c, and an unformer support plate 31d standing upright on the lower surface of the unformer upper plate 31b is provided from the apparatus frame 1. It is fixed by the bracket 31b. The unformer upper surface plate 31a and the unformer lower surface plate 31b are rectangular shapes that are long in the film guiding direction when viewed in the plane direction, and when viewed from the front, the required middle is vertically symmetrical. It has a bent shape. The portion of the upper side plate 31a of the unformer downstream from the bent portion in the film guide direction and the portion of the lower plate 31b of the unformer downstream from the bent direction in the film guiding direction are horizontally parallel and spaced from each other. The part on the upstream side of the film guide direction in the bending direction of the former upper plate 31a and the part in the film guide direction upstream of the bending point of the lower plate 31b in the former are required to be closer to each other as they are closer to each other. They are inclined at an angle of, for example, 20 degrees and are inclined to each other, and the ends are separated by about 2 mm. The film pressing rolls 33, 33 are rotatably supported by the roll support 35 so as to be positioned below the vicinity of the bent portion of the unformer lower plate 31b, and the position adjustment is performed by the arm 36 provided by the apparatus frame 1. It is attached so that the wrapping film F is brought into close contact with the bottom plate 31b of the unformer until the fold state of the gussets on both sides of the flat tubular film is resolved. The film on the downstream side is separated from the lower plate 31b of the unformer and spreads out. The gusset guides 34, 34 support the shafts of the disks 34a, 34a with bearings, and the bearings are fixed to a support arm 36 stretched from the apparatus frame 1 so that the spacing between them can be adjusted. However, by inserting only the gusset dimension between the sloped part of the former upper plate 31a and the sloped part of the former lower plate 31b, the valley-folded gussets on both sides are stretched and guided so as to expand into a rectangular tube shape. . The pair of rod-shaped film expansion guides 32, 32 are close to the upper surface of the unformer upper surface plate 31a, and when viewed in a plane direction, have a C shape that expands in the film guiding direction. Then, the packaging film F is slanted and wound while being guided by the film expansion guides 32, 32 toward the guide roll 74 located at a position lower than the lower surface plate 31b of the unformer. Further, this film is wound around the accumulator 40 via the guide rolls 77 and 78.

The power transmission mechanism 80 uses the servomotor 50 as a drive source to drive the lower tension roll 22 via the belt winding mechanism 81, and further, the sprocket 82 and the continuously variable transmission provided on the lower tension roll 22. The chain 84 is wound around the sprocket 83 provided on the 60, the power of the servomotor 50 is transmitted to the continuously variable transmission 60, and the continuously variable transmission 60 drives the pull-in roll 41 of the accumulator 40. .

The accumulator 40 passes the packaging film F from the unformer device 30 between the lower pulling roll 41 and the upper holding roll 46, and hangs it down between the pulling roll 41 and the feeding roll 42. The elevating roll 43 is placed on the hanging part of the packaging film F, the height of the elevating roll 42 is detected by the upper and lower two sensors 44 and 45, and the elevating roll 43 is pulled in so as to be located between the two sensors 44 and 45. The speed of the roll 41 is adjusted so as to correspond to the feeding speed of the packaging film F to the external device. The elevating roll 43 is arranged such that it rises when the film drawing speed of a horizontal bag-making filling and packaging machine (not shown) is fast and descends when the film drawing speed is slow. The reference rotation speed of the servo motor 50 is set so that the film drawing speed of the drawing roll 41 of the accumulator 40 becomes the same value as the film drawing speed of the horizontal bag-making filling and packaging machine, and the elevating roll 42 of the accumulator 40 is set. The reference rotation speed of the servo motor 50 is corrected according to the elevation of the. That is, two position sensors 44 and 45 detect the ascent and descent of the elevating roll 43, and the reference rotation speed of the servo motor 50 is increased or decreased based on the detection signal. The continuously variable transmission 60 is adjusted so that the film feeding speed of the drawing roll 41 is stabilized at about 1.1 times the film feeding speed of the lower drawing roll 22 of the hem forming device 20.

Next, the operation of the film forming apparatus having the gusseted hem-equipped square tubular bag configured as described above and having a crease will be described. The packaging film F is passed through the former device 10, then through the heme forming device 20, further through the unformer device 30, and then through the accumulator 40, which is an external device, specifically, a horizontal pillow of a regular pillow type. It is hung on the bag-making filling packaging machine. The transfer of the packaging film F passing through the former device 10 and the hem forming device 20 is performed by the tension roll 22 and the compaction roll 24 of the hem forming device 20. The transport of the packaging film F passing through the unformer device 30 is performed by the pull-in roll 41 of the accumulator 40. The pulling roll 22 and the pulling roll 41 are driven by a servo motor 50. The rotation speed of the servo motor 50 is such that the film pulling speed of the pulling roll 41 matches the film pulling speed of the horizontal bag-making filling and packaging machine. Is set. The continuously variable transmission 60 sets the number of revolutions of the pulling roll 41 to be slightly smaller than the number of revolutions of the pulling roll 22, specifically about 1.1 times larger, whereby the packaging film passing through the unformer device 30. The tension of F is secured. The accumulator 40 has a film pulling speed of the pulling roll 41 and a film of the horizontal bag-making filling and packaging machine due to the slip generated when the pulling roll 41 pulls the packaging film F and the stretching of the packaging film F. The discrepancy with the pulling speed is absorbed by the lifting of the lifting roll 43, and when the stroke limit is exceeded, the upper and lower limits of the lifting roll 42 are detected by the two sensors 44 and 45, and the servo based on the sensors 44 and 45 is detected. The reference rotational speed of the motor 50 is increased or decreased to correct the mismatch between the film drawing speed of the drawing roll 41 and the film drawing speed of the horizontal bag-making filling and packaging machine. That is, when the film drawing speed of the horizontal bag-making filling and packaging machine is faster than the film drawing speed of the drawing roll 41, the elevating roll 42 gradually rises, and when it reaches the upper limit, the sensor 44 detects this and the sensor 44 The servomotor 50 speeds up slightly based on the detection signal. Then, the elevating roll 42 gradually descends. Further, when the film drawing speed of the horizontal bag-making filling and packaging machine is slower than the film drawing speed of the drawing roll 41, the elevating roll 42 gradually descends, and when it reaches the lower limit, the sensor 45 detects this. Based on the detection signal of the sensor 45, the servo motor 50 becomes slightly slower. Then, the elevating roll 42 gradually rises. Thus, the elevating roll 42 moves up and down between the two sensors 44 and 45. The wrapping film F passing through the unformer device 30 maintains tension because the gear ratio of the continuously variable transmission 60 remains unchanged regardless of the operation of the accumulator 40 and the servomotor 50. Can get through well. More specifically, in the former device 10, the packaging film F is brought into close contact with the lower plate 11b of the former, and both side portions in the film width direction are overlapped with each other at the center of the upper plate 11a of the former so that the film alignment guide 12, 12 will guide you. The both sides of the film width direction are pressed by the film pressing rolls 13 and 13 so as to be in close contact with the former upper plate 11a, and together with the film aligning guides 12 and 12 are drawn to the center of the former upper plate 11a to be superposed. To In this way, the film pressing rolls 14 and 14 press the both sides of the film F in the film width direction, which surrounds the former top plate 11a and has a rectangular tube shape. Folding of the gusset is performed in a portion of the former upper surface plate 11a downstream of the bent portion in the film guiding direction and in a portion of the former lower surface plate 11b downstream of the bent portion in the film guiding direction. Both sides of the film F in the rectangular tube shape in the film width direction are pressed by the film pressing rolls 15 and 15, and the distance between the upper plate 11a of the former and the lower plate 11b of the former is narrowed. The part becomes loose. The slackened side portions of the square tube-shaped film F are guided so that the gusset guides 16 and 16 are valley-folded to form a gusset. Then, the packaging film F, which has come out of the former upper plate 11a and the former lower plate 11b, is wound around the winding roll 17 to form a gusseted flat tube shape. In the hem forming device 20, the wrapping film F in the form of a flat tube with gussets is tensioned between the upper squeezing roll 21 and the lower squeezing roll 22, and there are two pairs of several mm widths from the film edges on both sides. It is sandwiched between the heaters 23, 23, ... And heated to the welding temperature, and the compaction rolls 24, 24 compact the film edges on both sides and weld them to form the hem h. The hem h is formed at the four corners of the gusseted flat tubular section. The two pairs of heaters 23, 23, ... Are separated from the packaging film F when the film transfer is stopped. Next, in the part of the unformer device 30, the unformer upper surface plate 31a and the unformer lower surface plate 31b are provided inside the flat tubular film F which is hem-gusseted in the hem forming device 20. The unformer upper surface plate 31a and the unformer lower surface plate 31b gradually expand the distance between the flat cylindrical upper surface and the lower surface. At this time, the gusset guides 36, 36 are prevented from getting into the gussets on both sides and stretching and loosening. Then, the flat tubular film F with hem and gussets is guided into a square tubular shape in which the valley fold state of the gussets on both sides is eliminated. Subsequently, the packaging film F held by the film holding rolls 33, 33 is expanded, and further guided by the pair of rod-shaped film expanding guides 32, 32 to be developed into a flat surface with four hems. Then, the wrapping film F having the hem h and developed in a flat shape is hung on a former (not shown) of the horizontal bag-making filling and packaging machine.

[0015]

[Effect of device]

 As explained above, according to the film forming apparatus of the present invention, which is a square tubular bag with a gusset and a hem, which has a habit, a continuously variable transmission is provided in the drive system of the pulling roll and the pulling roll. It is driven by a single servomotor so that the rotation speed of the roll is slightly higher than the rotation speed of the pull-in roll, and the film pull-in speed of the pull-in roll matches the film pull-in speed of the horizontal bag-filling and packaging machine. , The standard rotation speed of the servo motor is set, slips that occur when the drawing roll pulls the packaging film, and the wrapping film stretches. The discrepancy with the film drawing speed of the machine is absorbed by the lifting of the lifting roll of the accumulator, When the limit is exceeded, the servo motor reference speed is increased or decreased to correct the inconsistency, so it can be easily installed as an optional device on the existing horizontal pillow type horizontal bag filling and packaging machine. The horizontal film-making and filling-packing machine is perfectly synchronized with the transfer speed of the packaging film. Since the former device, the hem forming device, and the unformer device are arranged in a U-shape and the packaging film is guided to make a U-turn on them, it is an independent device that suppresses the horizontal length. It can be placed on the carry-in conveyor of the bag-making filling and packaging machine, and can be installed without taking up a space larger than the length of the carry-in conveyor.

[Brief description of drawings]

FIG. 1 is a schematic overall front view of a film forming apparatus for forming a crease, which is a square tubular bag with a hem and a hem according to an embodiment of the present invention.

2A is a sectional view taken along the line IIa-IIa in FIG.
(B) is a IIb-IIb sectional view in FIG. 1.

FIG. 3 is a III-III diagram in FIG. 1.

[Explanation of symbols]

 F ... packaging film, h ... hem, 10 ... former device, 11 ... former, 11a ... former upper plate, 11b ... former lower plate, 20 ... hem forming device, 21 ... Straining roll, 22 ... Swelling roll, 23 ... Heater, 24 ... Rolling roll, 30 ... Unformer device, 31 ... Unformer, 31a ... Anne Top plate of former, 31b ... Bottom plate of unformer, 40 ... Accumulator, 41 ... Pulling roll, 42 ... Elevating roll, 43 ... Feeding roll, 44 ... Sensor, 45. ..Sensors, 46 ... Holding rolls, 50 ... Servo motors, 60 ... Continuously variable transmission,

Claims (1)

[Scope of utility model registration request] 1. A packaging film comprising a former comprising a top plate of a former and a bottom plate of the former which are parallel to each other on the upstream side and inclined toward each other on the downstream side. Both edges of the film are overlapped at the width center of the top plate of the former to form a rectangular tube. And a former device that folds the upper surface plate of the former and the lower surface plate of the former and guides them to be gusseted to form a square tubular bag with a gusset,
It has two pairs of heaters which are long between the two stretching rolls along the film transport direction and are spaced apart in the direction orthogonal to the film transport direction, and the two rolling rolls are separated from the stretching rolls on the downstream side by the heaters. Contact according to distance,
From the former device, the packaging film is hung on two wrapping rolls, and a few mm width of both side edges of the packaging film is sandwiched by two pairs of heaters, and the packaging film is heated to a welding temperature while sliding and passing through the heating portion. A hem forming device for forming a hem by welding with a rolling roller to form a hem at the base end folding part of the gusset;
While guiding the flat packaging film with a gusseted hem and a square tube with a gusset from the hem forming device so as to wrap it around an unformer composed of an unformer upper plate and an unformer lower plate whose upstream sides are parallel to each other and whose downstream sides are inclined toward each other. An unformer device that guides the gusset fold between the lower plate of the unformer and the lower plate of the unformer to develop the packaging film into a flat surface, and the packaging film from the unformer device to the lower side Pass it between the pulling roll and the upper pressing roll, hang it down between the pulling roll and the feeding roll, place the lifting roll on the hanging part of the packaging film, and detect the height of the lifting roll with two sensors. By adjusting the speed of the drawing roll so that the lifting roll is located between the two sensors, It is composed of an accumulator configured to correspond to the delivery speed to the device, and the tension roll on the downstream side of the heme forming device is driven by the servo motor, and the power of the servo motor is branched. Furthermore, the branching power of the accumulator is driven by the branching power that is slightly increased through the continuously variable transmission.The film drawing speed of the accumulator drawing roll is the film drawing speed of the horizontal bag-filling and packaging machine. A square bag with a hem set and a gusset with a standard rotation speed of the servo motor set so that the standard rotation speed of the servo motor is corrected according to the elevation of the elevating roll of the accumulator. A film forming device that creates a crease.