Bag-making and packaging machine

Abstract

To provide a bag-making and packaging machine in which a guide member is not damaged even when it collides with an obstacle.SOLUTION: A bag-making and packaging machine 1 includes a vertical sealing device 15, a guide member 18, and a protection device 20. The guide member 18 is supported on a downstream side of the vertical sealing device 15 and guides a vertical sealing part Fls sent out from the vertical sealing device 15 along a conveyance direction. The protection device 20 follows the movement of the vertical sealing device 15 to a sealing position together with the guide member 18 in a state of supporting the guide member 18, and when the movement of the guide member 18 is restricted when the vertical sealing device 15 moves to the sealing position, the guide member 18 is moved in a retreat direction away from the sealing position. Even if the guide member 18 following the vertical sealing device 15 moving to the sealing position collides with an obstacle, the protection device 20 moves the guide member 18 in the retreat direction, thereby preventing damage to the guide member 18.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a bag-making and packaging machine. [Background technology]

[0002] In a form-fill-seal machine, a sheet of film is conveyed through a cylindrical former, which overlaps both ends of the film parallel to the conveyance direction to form a cylindrical shape. The overlapped portion of the cylindrical film is vertically sealed along the conveyance direction by a vertical sealing device. The cylindrical film is then horizontally sealed in a direction perpendicular to the conveyance direction by a horizontal sealing device to form a bag.

[0003] For example, in the bag-making packaging machine described in Patent Document 1 (JP 2008-18997 A), a guide member is provided between the vertical sealing device and the horizontal sealing device to prevent the vertical seal portion from collapsing. The guide member is supported by an openable first frame, and the first frame moves together with a retractable second frame, allowing the guide member to move toward and away from the vertical seal portion. Summary of the Invention [Problem to be solved by the invention]

[0004] The guide member is mainly set before production begins or after film replacement, and is brought close to the former so as to sandwich the sealing portion. Therefore, if the setting position is improper or if there is an obstacle between the former and the guide member, there is a risk that the guide member will be damaged by a collision.

[0005] Therefore, there is a demand for a bag-making and packaging machine that will not be damaged even if the guide member collides with an obstacle or the like. [Means for solving the problem]

[0006] A first aspect of the bag-making and packaging machine includes a former, a vertical sealing device, a movement mechanism, a guide member, and a protection device. The former forms a tubular film having an overlapping portion by overlapping both ends of the conveyed sheet film that are parallel to the conveying direction. The vertical sealing device forms the vertical seal portion by sealing the overlapping portion along the conveying direction. The movement mechanism moves the vertical sealing device between a sealing position where the overlapping portion is sealed and a retracted position away from the overlapping portion. The guide member is supported downstream of the vertical sealing device and guides the vertical seal portion delivered from the vertical sealing device along the conveying direction. The protection device supports the guide member and follows the movement of the vertical sealing device together with the guide member to the sealing position. When the movement of the guide member is restricted when the vertical sealing device moves to the sealing position, the protection device moves the guide member in a retracted direction away from the sealing position.

[0007] In this bag-making packaging machine, even if the guide member that follows the vertical sealing device as it moves to the sealing position collides with an obstacle, the protection device moves the guide member in the retreat direction, thereby avoiding damage to the guide member.

[0008] A second aspect of the bag-making packaging machine is the bag-making packaging machine of the first aspect, wherein the protection device includes a link mechanism. The link mechanism swings the guide member in the retraction direction when a load in the retraction direction acts on the guide member.

[0009] In this bag-making packaging machine, the link mechanism reduces the load on the guide member, preventing damage to the guide member.

[0010] A form-fill-seal machine according to a third aspect is the form-fill-seal machine according to the second aspect, wherein the link mechanism has a first link, a second link, and a third link. The first link follows the vertical sealing device. The second link holds a guide member. The third link connects the second link to the first link.

[0011] In this bag-making packaging machine, the first link and second link can move relative to each other via the third link, and when a load is applied in a direction that hinders the movement of the guide member, the second link that holds the guide member moves relative to the first link, thereby alleviating the load on the guide member and avoiding damage to the guide member.

[0012] A fourth aspect of the present invention is a form-fill-seal machine according to the third aspect, wherein the protection device includes a magnetic member that uses magnetic force to prevent the guide member from swinging when the load is less than a predetermined load.

[0013] In this bag-making packaging machine, the magnetic member suppresses unnecessary swinging of the link mechanism, so the position of the guide member is stable.

[0014] A fifth aspect of the bag-making packaging machine is the fourth aspect, wherein the magnetic member is fixed to either the first link or the third link, and when the load acting on the guide member is less than a predetermined load, the third link is fixed to the first link.

[0015] In this bag-making packaging machine, the magnetic member suppresses unnecessary swinging of the link mechanism, so the position of the guide member is stable.

[0016] A fifth aspect of the bag-making packaging machine is any one of the first to fifth aspects, in which the retraction direction of the guide member is opposite to the forward direction of the guide member that follows the vertical sealing device moving to the sealing position.

[0017] In this bag-making packaging machine, the guide member moves along a single path, so the protection device is simplified. [Effects of the Invention]

[0018] In the bag-making packaging machine of the present invention, even if the guide member that follows the vertical sealing device as it moves to the sealing position collides with an obstacle, the protection mechanism moves the guide member in the retreat direction, thereby avoiding damage to the guide member. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of a bag-making and packaging machine according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 2 is a perspective view showing a schematic configuration of a bag-making and packaging unit. [Figure 4] 4 is a cross-sectional plan view of the vertical sealing device when cut by a virtual horizontal plane shown in FIG. 3. FIG. [Figure 5] FIG. 5 is a view taken along the arrow AA in FIG. 4. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 7 is a side view of the protection device of FIG. 6 in an activated state. [Figure 9] FIG. 8 is a perspective view of the protection device of FIG. 7 in an activated state. [Figure 10] FIG. 10 is a side view of a modified example of the protection device before it is activated. [Figure 11] FIG. 10 is a side view of a modified example of the protection device after it has been activated. DETAILED DESCRIPTION OF THE INVENTION

[0020] (1) Configuration of the bag-making and packaging machine 1 Fig. 1 is a perspective view of a form-fill-seal machine 1 according to one embodiment of the present invention. In Fig. 1, form-fill-seal machine 1 is a machine for packing items such as food into bags. Form-fill-seal machine 1 includes a combination weighing unit 2, a form-fill-seal unit 3, a film supply unit 4, an operation switch 5, a liquid crystal display 6, and a control unit 7.

[0021] (1-1) Combination Weighing Unit 2 The combination weighing unit 2 is located above the bag-making and packaging unit 3. The combination weighing unit 2 weighs the weight of items using multiple weighing hoppers 2a and combines the weight values ​​measured by each weighing hopper 2a to reach a predetermined total weight. The combination weighing unit 2 discharges the combined items of the predetermined total weight downward and supplies them to the bag-making and packaging unit 3.

[0022] (1-2) Bag making and packaging department 3 The bag-making and packaging unit 3 seals and packages the articles in bags in accordance with the timing at which the articles are supplied from the combination weighing unit 2. The detailed configuration and operation of the bag-making and packaging unit 3 will be described later.

[0023] (1-3) Film supply unit 4 The film supply unit 4 is installed adjacent to the bag making and packaging unit 3, and feeds the film to be formed into bags to the bag making and packaging unit 3. A film roll around which film is wound is set in the film supply unit 4.

[0024] (1-4) Operation switch 5 and LCD display 6 The operation switch 5 and the liquid crystal display 6 are attached to the front of the main body of the bag-making packaging machine 1. The liquid crystal display 6 is a touch panel type display, and is placed in a position where it can be seen by the worker who operates the operation switch 5.

[0025] The operation switches 5 and the liquid crystal display 6 function as input devices that accept instructions to the bag-making packaging machine 1 and settings related to the bag-making packaging machine 1. The liquid crystal display 6 functions as an output device that displays information related to the bag-making packaging machine 1.

[0026] (1-5) Control Unit 7 The control unit 7 controls the combination weighing unit 2, bag making and packaging unit 3, and film supply unit 4 based on input from the operation switches 5 and the liquid crystal display 6, and outputs various information to the liquid crystal display 6.

[0027] 2 is a block diagram of the control unit 7. The control unit 7 controls the operation of each driving part of the bag making and packaging machine 1. Furthermore, the control unit 7 controls the timing of dropping articles from the combination weighing unit 2.

[0028] The control unit 7 includes a CPU 71 , a ROM 72 connected to the CPU 71 , and a RAM 73 .

[0029] The control unit 7 is connected to the combination weighing unit 2, the bag making and packaging unit 3, the film supply unit 4, the operation switch 5, and the liquid crystal display 6.

[0030] (2) Configuration of the bag making and packaging unit 3 Fig. 3 is a perspective view showing the schematic configuration of the bag making and packaging unit 3. In Fig. 3, six directions are defined: "front (front face)," "back (rear face)," "upper," "lower," "left," and "right."

[0031] The bag-making and packaging unit 3 includes a former 13 , a pull-down belt 14 , a vertical sealing device 15 , and a horizontal sealing device 17 .

[0032] (2-1) Forma 13 The former 13 is a cylindrical member into which the articles C supplied from the combination weighing unit 2 are fed. The former 13 also overlaps both ends of the sheet-like film F unwound from the film roll in the film supply unit 4 that are parallel to the conveying direction, thereby forming a cylindrical film Fc having an overlapping portion.

[0033] (2-2) Pull-down belt 14 The pull-down belt 14 conveys the film F wound around the former 13 downward while adsorbing it.

[0034] (2-3) Vertical sealing device 15 The vertical sealing device 15 seals the overlapping portions of the tubular film Fc in the vertical direction (the up-and-down direction in FIG. 3). The vertical sealing device 15 is disposed on the front side of the former 13. The vertical sealing device 15 can be moved in the front-to-back direction by a movement mechanism (not shown) so as to move closer to or away from the former 13.

[0035] Fig. 4 is a cross-sectional plan view of the vertical sealing device 15 taken along the imaginary horizontal plane Fv shown in Fig. 3. In Fig. 4, the vertical sealing device 15 has a pair of vertical sealing jaws 15a, 15b.

[0036] Of the pair of vertical seal jaws 15a, 15b, one vertical seal jaw 15a is movable and the other vertical seal jaw 15b is fixed. The overlapping portion of the tubular film Fc is sandwiched between the pair of vertical seal jaws 15a, 15b and sealed by applying a constant pressure while being heated. As a result, a vertical seal portion Fls is formed.

[0037] 4 shows the state in which the vertical seal portion Fls is formed and the movable vertical seal jaw 15a is separated from the fixed vertical seal jaw 15b. The shortest distance D1 between the pair of vertical seal jaws 15a, 15b and the former 13 is preferably 1 mm.

[0038] (2-4) Horizontal sealing device 17 The horizontal sealing device 17 seals the tubular film Fc in the horizontal direction. The horizontal sealing device 17 is disposed below the vertical sealing device 15.

[0039] The horizontal sealing device 17 has a pair of horizontal seal jaws 17a, 17b. The pair of horizontal seal jaws 17a, 17b sandwich the tubular film Fc in the front-to-rear direction in FIG.

[0040] (2-5) Guide member 18 The guide member 18 is positioned below the vertical sealing device 15 and sandwiches the vertical seal portion Fls to prevent the vertical seal portion Fls from falling over.

[0041] Fig. 5 is a view taken along the line AA in Fig. 4. In Fig. 5, the guide member 18 has a first plate 18a and a second plate 18b that extend parallel to each other in the vertical direction. The first plate 18a is shorter than the second plate 18b.

[0042] The shortest distance D2 between the tips of the first plate 18a and the second plate 18b closest to the former 13 and the tips of the pair of vertical seal jaws 15a, 15b is preferably 2 mm. Also, the gap D3 between the first plate 18a and the second plate 18b is preferably 4 mm.

[0043] (2-6) Moving mechanism 19 Fig. 6 is a side view of the periphery of the vertical sealing device 15. In Fig. 6, the movement mechanism 19 includes a first movable body 19a, a second movable body 19b, and a guide rod 19c. The first movable body 19a holds the vertical sealing device 15 and can move back and forth along the guide rod 19c. The second movable body 19b holds the protection device 20 and can move back and forth together with the first movable body 19a.

[0044] (2-7) Protective device 20 7 is a perspective view of the periphery of the vertical sealing device 15. In FIGS. 6 and 7, the protection device 20 has a first link 21, a second link 22, a third link 23, a fourth link 24, and a magnet 25.

[0045] The first link 21, the second link 22, the third link 23 and the fourth link 24 form a four-section link, and the third link 23 and the fourth link 24 connect the second link 22 to the first link 21 so that the second link 22 can swing relative to the first link 21.

[0046] (2-7-1) 1st Link 21 As shown in Figure 7, when the first link 21 is viewed from a direction in which the pair of vertical seal jaws 15a, 15b are in front, the first link 21 has a smooth, plate-shaped first vertical portion 21a in a vertical position, and a smooth, plate-shaped first horizontal portion 21b protruding horizontally from the upper end of the first vertical portion 21a.

[0047] The first horizontal portion 21b is fixed by a screw to the second movable body 19b of the movement mechanism 19. Therefore, the first link 21 can move back and forth together with the second movable body 19b.

[0048] One end of each of a third link 23 and a fourth link 24 is rotatably connected to the first vertical portion 21a.

[0049] When the first link 21 is viewed with the first vertical portion 21a facing forward, the first link 21 has a first plate-shaped piece 211 and a second plate-shaped piece 212 that protrude vertically forward from the first vertical portion 21a. The first plate-shaped piece 211 and the second plate-shaped piece 212 have the same shape and are adjacent to each other in parallel with a predetermined distance between them. The first plate-shaped piece 211 is closer to the vertical sealing device 15 than the second plate-shaped piece 212.

[0050] (2-7-2) 2nd Link 22 As shown in Figure 7, when the second link 22 is viewed from a direction in which the pair of vertical seal jaws 15a, 15b are in front, the second link 22 has a smooth, plate-shaped second vertical portion 22a in a vertical position, and a smooth, plate-shaped second horizontal portion 22b protruding horizontally from the lower end of the second vertical portion 22a.

[0051] The second horizontal portion 22b has an attachment piece 22c that extends to below the pair of vertical seal jaws 15a, 15b. The first plate 18a and the second plate 18b of the guide member 18 are fixed to the attachment piece 22c with screws.

[0052] (2-7-3) 3rd Link 23 The third link 23 is a long, thin plate-like member, one end of which is rotatably connected to the first vertical portion 21a of the first link 21 via the first connecting portion 23a, and the other end of which is rotatably connected to the second vertical portion 22a of the second link 22 via the second connecting portion 23b.

[0053] When the third link 23 is viewed with the first vertical portion 21a of the first link 21 facing forward, the end face of the third link 23 in the width direction that is closer to the vertical sealing device 15 faces the first plate-like piece 211 of the first link 21. In this embodiment, the position of the third link 23 shown in Figures 6 and 7 is the original position.

[0054] (2-7-4) 4th Link 24 The fourth link 24 is a long, thin plate-like member having the same shape as the third link 23, and is adjacent to the third link 23 in parallel at a certain distance. One end of the fourth link 24 is rotatably connected to the first vertical portion 21a of the first link 21 via a first connecting portion 24a, and the other end is rotatably connected to the second vertical portion 22a of the second link 22 via a second connecting portion 24b.

[0055] When the fourth link 24 is viewed with the first vertical portion 21a of the first link 21 facing forward, the end face of the fourth link 24 in the width direction that is closer to the vertical sealing device 15 faces the second plate-like piece 212 of the first link 21. In this embodiment, the position of the fourth link 24 shown in Figures 6 and 7 is the original position.

[0056] (2-7-5) Magnet 25 Magnet 25 is provided between first connecting portion 23a and second connecting portion 23b of third link 23, and between first connecting portion 24a and second connecting portion 24b of fourth link 24. Magnet 25 is fixed to third link 23 and fourth link 24 with screws.

[0057] 7, the magnet 25 fixed to the third link 23 is in close contact with the first plate-like piece 211 of the first link 21 by magnetic force. The magnet 25 fixed to the fourth link 24 is in close contact with the second plate-like piece 212 of the first link 21 by magnetic force.

[0058] Therefore, the third link 23 does not swing about the first connecting portion 23a, and similarly, the fourth link 24 does not swing about the first connecting portion 24a.

[0059] (3) Operation of the bag-making and packaging unit 3 1 to 4, the operation of the bag making and packaging unit 3 configured as described above, in which the bag making and packaging unit 3 seals an item C in a bag B, will be described. The film F supplied from the film supply unit 4 to the bag making and packaging unit 3 is wound around the former 13 and formed into a tubular shape to become a tubular film Fc, which is then conveyed downward by the pull-down belts 14.

[0060] At this time, both ends of the tubular film Fc extending in the conveyance direction are overlapped. The overlapping portion of the tubular film Fc is sealed in the vertical direction by vertical sealing device 15, forming a vertical seal portion Fls.

[0061] After the tubular film Fc is formed, the lateral sealing device 17 sandwiches and transversely seals the tubular film Fc between a pair of lateral sealing jaws 17a, 17b. At this time, a bag B containing an item C is formed below the transversely sealed portion of the tubular film Fc.

[0062] Meanwhile, above the transversely sealed portion of the tubular film Fc, the articles C weighed by the combination weighing unit 2 fall through the former 13 and are introduced into the tubular film Fc.

[0063] Additionally, in synchronization with the timing at which the tubular film Fc is transversely sealed, a cutting mechanism (not shown) built into the transverse seal jaws 17a cuts the transversely sealed portion of the tubular film Fc in the transverse direction, thereby separating the bag B containing the item C from the subsequent tubular film Fc.

[0064] (4) Operation of the protection device 20 In the bag-making and packaging unit 3, before production begins or when the film in the film supply unit 4 is switched in response to a change in the product to be produced, the movement mechanism 19 moves the vertical sealing device 15 from the sealing position to a retracted position in a direction away from the former 13. At this time, the guide member 18 also moves together with the vertical sealing device 15.

[0065] After making the necessary positional adjustments to the moved vertical sealing device 15 and guide member 18, the worker moves the vertical sealing device 15 to the sealing position using the movement mechanism 19. At this time, the guide member 18 also moves together with the vertical sealing device 15, and the vertical seal portion Fls enters between the first plate 18a and the second plate 18b.

[0066] When the vertical sealing device 15 is in the sealing position, the shortest distance between the guide member 18 and the former 13 is approximately 3 mm, so if there is an improper position adjustment or if an obstacle such as a jig remains in front of the former 13, the guide member 18 may be damaged by a collision.

[0067] Therefore, the guide member 18 is not directly fixed to the moving mechanism 19, but is attached to the moving mechanism 19 via a protection device 20 that holds the guide member 18.

[0068] Fig. 8 is a side view of the protection device 20 in Fig. 6 in an activated state. Fig. 9 is a perspective view of the protection device 20 in Fig. 7 in an activated state. In Figs. 8 and 9, the explanation will be given on the assumption that an obstacle T is caught between the former 13 and the tip of the guide member 18.

[0069] When the guide member 18 is prevented from moving forward by an obstacle T, the resistance force from the obstacle T is transmitted from the guide member 18 via the second vertical portion 22a of the second link 22 to the second connecting portion 23b of the third link 23 and the second connecting portion 24b of the fourth link 24.

[0070] At this time, a rotational torque acts on the third link 23, tending to rotate the third link 23 around the first connecting portion 23a, and a rotational torque acts on the fourth link 24, tending to rotate the fourth link 24 around the first connecting portion 24a.

[0071] Meanwhile, a static torque is acting between the first plate-like piece 211 of the first link 21 and the magnet 25 due to magnetic force, which keeps the third link 23 in its original position.

[0072] Similarly, a static torque is applied between the second plate-like piece 212 of the first link 21 and the magnet 25 by magnetic force, which keeps the fourth link 24 in its original position.

[0073] Therefore, when a load greater than a predetermined load acts in direction D, which is the retraction direction of guide member 18 shown in Figure 8, a rotational torque greater than the static torque of third link 23 acts on third link 23, and a rotational torque greater than the static torque of fourth link 24 acts on fourth link 24.

[0074] As a result, the close contact between the first plate-like piece 211 of the first link 21 and the magnet 25 on the third link 23 is released, and the close contact between the second plate-like piece 212 of the first link 21 and the magnet 25 on the fourth link 24 is released, and the second link 22 moves in the direction D in Figure 8 together with the guide member 18. The direction D is the exact opposite direction to the moving direction of the guide member 18 that follows the vertical sealing device 15 moving to the sealing position.

[0075] When the obstacle impeding the progress of the guide member 18 is removed, the weight of the second link 22 and the guide member 18 acts on the third link 23 and the fourth link 24, so that the third link 23 and the fourth link 24 return to their original positions, the first plate-like piece 211 of the first link 21 and the magnet 25 on the third link 23 come into close contact with each other, and the second plate-like piece 212 of the first link 21 and the magnet 25 on the fourth link 24 come into close contact with each other.

[0076] The magnetic force of the magnet 25 is sufficient to prevent the guide member 18 from being damaged when the guide member 18 is obstructed from moving forward, and to disengage the guide member 18 from the first plate-shaped piece 211 and the second plate-shaped piece 212 of the first link 21.

[0077] (5) Features (5-1) The bag-making and packaging machine 1 includes a former 13, a vertical sealing device 15, a movement mechanism 19, a guide member 18, and a protection device 20. The former 13 overlaps both ends of the conveyed sheet-like film F, which are parallel to the conveyance direction, to form a tubular film Fc having an overlapping portion. The vertical sealing device 15 seals the overlapping portion along the conveyance direction to form a vertical seal portion Fls. The movement mechanism 19 moves the vertical sealing device 15 between a sealing position where the overlapping portion is sealed and a retracted position away from the overlapping portion. The guide member 18 is supported downstream of the vertical sealing device 15 and guides the vertical seal portion Fls sent out from the vertical sealing device 15 along the conveyance direction. The protection device 20 supports the guide member 18 and follows the movement of the vertical sealing device 15 to the sealing position together with the guide member 18. When the movement of the guide member 18 is restricted when the vertical sealing device 15 moves to the sealing position, the protection device 20 moves the guide member 18 in the retracting direction away from the sealing position.

[0078] In the bag-making packaging machine 1, even if the guide member 18 that follows the vertical sealing device 15 moving to the sealing position collides with an obstacle, the protection device 20 moves the guide member 18 in the retreat direction, thereby preventing damage to the guide member 18.

[0079] (5-2) The protection device 20 includes a link mechanism. The link mechanism swings the guide member 18 in the retraction direction when a load in the retraction direction acts on the guide member 18. As a result, even if a load is applied to the guide member 18, the load is alleviated, and damage to the guide member 18 is avoided.

[0080] (5-3) The link mechanism has a first link 21, a second link 22, and a third link 23. The first link 21 follows the vertical sealing device 15. The second link 22 holds the guide member 18. The third link 23 connects the second link 22 to the first link 21. The first link 21 and the second link 22 are capable of relative movement by the third link 23, and when a load is applied in a direction that hinders the movement of the guide member 18, the second link 22 that holds the guide member 18 moves relative to the first link 21, thereby alleviating the load on the guide member 18 and preventing damage to the guide member 18.

[0081] (5-4) The protection device 20 includes a magnet 25. The magnet 25 uses magnetic force to prevent the swinging of the guide member 18 when the load is less than a predetermined load. The magnet 25 suppresses unnecessary swinging of the third link 23, thereby stabilizing the position of the guide member 18.

[0082] (5-5) Magnet 25 is fixed to either first link 21 or third link 23, and when the load acting on guide member 18 is less than a predetermined load, it fixes third link 23 to first link 21. Magnet 25 suppresses unnecessary swinging of the link mechanism, thereby stabilizing the position of guide member 18.

[0083] (5-6) The retraction direction of the guide member 18 is opposite to the direction of travel of the guide member 18 following the vertical sealing device 15 moving to the sealing position. Since the movement path of the guide member 18 is single, the protection device 20 is simplified.

[0084] (6) Variations In the above embodiment, the third link 23 and the fourth link 24 are maintained in their original positions by the magnetic force of the magnet 25, but instead of the magnet 25, a spring may be used.

[0085] Fig. 10 is a side view of a modified example of the protection device 20 before it is activated, and Fig. 11 is a side view of a modified example of the protection device 20 after it is activated.

[0086] 10 and 11, a coil spring 27 is used instead of the magnet 25 of the protection device 20 of the above embodiment. Since the other configurations are the same as those of the above embodiment, the same reference numerals and names are used and the description thereof will be omitted.

[0087] In FIG. 10, the upper end of the third link 23 is provided with a hook 23c to which one end of the coil spring 27 is hooked.

[0088] Similarly, the fourth link 24 has at its upper end a hook 24c on which one end of a coil spring 27 is hooked.

[0089] Furthermore, in the first vertical portion 21a of the first link 21, a first small hole 213 is provided on the side of the first connecting portion 23a of the third link 23, into which the other end of the coil spring 27 is hooked.

[0090] Similarly, in the first vertical portion 21a of the first link 21, a second small hole 214 is provided on the side of the first connecting portion 24a of the fourth link 24, and the other end of the coil spring 27 is hooked thereto.

[0091] The third link 23 receives a rotational force from the coil spring 27 in a direction that causes the third link 23 to come into contact with the first plate-shaped piece 211 of the first link 21 .

[0092] Similarly, the fourth link 24 receives a rotational force from the coil spring 27 in a direction that causes the fourth link 24 to come into contact with the second plate-shaped piece 212 of the first link 21 .

[0093] In Figure 11, when the progress of guide member 18 is hindered by an obstacle, the resistance force is transmitted from guide member 18 via second vertical portion 22a of second link 22 to second connecting portion 23b of third link 23 and second connecting portion 24b of fourth link 24.

[0094] At this time, a rotational torque acts on the third link 23, tending to rotate the third link 23 around the first connecting portion 23a, and a rotational torque acts on the fourth link 24, tending to rotate the fourth link 24 around the first connecting portion 24a.

[0095] When a rotational torque exceeding the static torque of the third link 23 and the fourth link 24 due to the coil spring 27 acts on the third link 23 and the fourth link 24, the second link 22 moves in the direction D in Fig. 11 together with the guide member 18. The direction D is the exact opposite direction to the moving direction of the guide member 18 that follows the vertical sealing device 15 moving to the sealing position.

[0096] On the other hand, when the obstacle impeding the progress of the guide member 18 is removed, the third link 23 and the fourth link 24 are acted upon by the spring force of the coil spring 27 as well as the weight of the second link 22 and the guide member 18, so that the third link 23 and the fourth link 24 return to their original positions, the first plate-like piece 211 of the first link 21 comes into contact with the third link 23, and the second plate-like piece 212 of the first link 21 comes into contact with the fourth link 24.

[0097] The spring force of the coil spring 27 is sufficient to prevent damage to the guide member 18 when its progress is obstructed, and to disengage the third link 23 and the fourth link 24 from the first plate-like piece 211 and the second plate-like piece 212 of the first link 21.

[0098] Furthermore, the spring is not limited to the coil spring 27, but other springs such as a torsion spring may also be used.

[0099] (7) Other embodiments (7-1) In the above-described modified example, torque is applied to the third link 23 and the fourth link 24 by spring force, but this may be replaced by a configuration in which spring force is applied to a slider capable of linear reciprocating motion. Also, slight air pressure may be used as the force applied to the slider.

[0100] (7-2) In the above embodiment and variant examples, it has been explained that when the progress of the guide member 18 is obstructed while the guide member 18 is following the vertical sealing device 15 moving to the sealing position, the guide member 18 moves in the retreat direction by the protective device 20.

[0101] However, the guide member 18 may be retracted to follow the vertical sealing device 15 as it moves to the sealing position, and the guide member 18 may be moved below the vertical sealing device 15 after the vertical sealing device 15 reaches the sealing position.

[0102] (7-3) In this embodiment and the modified example, the second link 22 is moved relative to the first link 21 by the third link 23 and the fourth link 24, but the second link 22 may be moved relative to the first link 21 by only the third link 23. [Explanation of symbols]

[0103] 1 Bag making and packaging machine 13 Forma 15 Vertical sealing device 18 Guide member 19 Moving mechanism 20 Protective devices 21 First link (link mechanism) 22 Second link (link mechanism) 23 Third link (link mechanism) 24 4th link (link mechanism) 25 Magnets (magnetic components) F film (sheet film) Fc cylindrical film Fls Vertical seal part (vertical seal part) [Prior art documents] [Patent documents]

[0104] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-18997

Claims

1. a former that forms a tubular film having overlapping portions by overlapping both end portions of the sheet film that are parallel to the conveying direction of the conveyed sheet film; a vertical sealing device that seals the overlapping portion along the conveyance direction to form a vertical seal portion; a movement mechanism that moves the vertical sealing device between a sealing position where the overlapping portion is sealed and a retracted position where the vertical sealing device is separated from the overlapping portion; a guide member supported on a downstream side of the vertical sealing device and configured to guide the vertical seal portion sent out from the vertical sealing device along the conveying direction; a protection device that follows the movement of the vertical sealing device to the sealing position together with the guide member while supporting the guide member, and that moves the guide member in a retracting direction away from the sealing position when the movement of the guide member is restricted when the vertical sealing device moves to the sealing position; A bag making and packaging machine comprising:

2. The protection device includes a link mechanism that swings the guide member in the retraction direction when a load in the retraction direction acts on the guide member. The bag making and packaging machine according to claim 1.

3. The link mechanism includes: a first link that follows the vertical sealing device; a second link that holds the guide member; a third link connecting the second link to the first link; and having The bag-making and packaging machine according to claim 2.

4. The protection device includes a magnetic member that prevents the guide member from swinging by magnetic force when the load is less than a predetermined load. The bag-making and packaging machine according to claim 3.

5. the magnetic member is fixed to one of the first link and the third link, and fixes the third link to the first link when the load acting on the guide member is less than the predetermined load. The bag-making and packaging machine according to claim 4.

6. The retraction direction of the guide member is a direction opposite to a traveling direction of the guide member following the vertical sealing device moving to the sealing position. The bag-making and packaging machine according to any one of claims 1 to 5.

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