JP2013119414A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device capable of sealing a bag body which moves continuously, and is long in a moving direction without temporarily stopping the bag body.SOLUTION: The sealing device includes a pair of bar sealers 31 and 32 arranged to be opposed to each other while putting the bag body therebetween, and a driving mechanism which moves to revolve each of the pair of bar sealers in a horizontal plane while holding a state that the sealing surfaces of the pair of bar sealers are opposed to each other. The driving mechanism moves to revolve each of the pair of bar sealers in a state that the bar sealer is supported to be cantilevered. The driving mechanism includes rotating bodies 60 and 62 which receive outputs from a motor 38 and rotate on the horizontal plane, a cam follower 64 which is attached to the rotating body, a cam 65 with which the cam follower is made to cooperate, and a sealer coupling part 66 which is provided at an opposite side with respect to the cam follower on the rotating body. The shape of the cam is formed so that the cam follower moves along the track of the cam accompanied by the rotation of the rotating body to vary a distance to the sealer coupling part from the center of the rotation of the rotating body while the rotating body rotates, and then the pair of bar sealers are displaced in parallel with the moving direction of a film in a fixed section in a state of being brought into contact with each other.

Description

  The present invention relates to a sealing device, and more specifically, for a moving film, which has a length in the moving direction, for example, seals an upper opening of a bag body in the middle of conveyance. Related to what is suitable for.

  As one of the packaging forms, there is a self-supporting package called a standing pouch or the like. The self-supporting package is excellent in ease of product display and display effect, and has recently been in demand. Some of the self-supporting packages have gussets in which standing side edges are folded inward.

  This type of self-supporting package includes, for example, a bag making process for manufacturing a bag body using a sheet-like packaging film, a bag opening process for receiving the manufactured bag and opening an upper opening, and a bag from the opened opening. Manufactured through a filling process for filling the inside of the body with an article to be packaged such as a snack, and a sealing process for closing and sealing the opened opening. For example, as shown in Patent Document 1 or the like, a bag making and filling machine that performs each process continuously in one of these systems, or a separately manufactured bag shown in Patent Document 2 or the like is received and opened. There is a filling and packaging machine that performs each process after the process.

  And as a sealing device for performing the above-mentioned sealing process, Patent Documents 1 and 2 disclose a concept of providing a pair of bar sealers and heat-sealing by sandwiching and heating the opening of the bag.

Japanese Patent Laid-Open No. 2001-72004 JP-A-8-119210

  A specific configuration of the sealing device disclosed in each patent document is not disclosed. Furthermore, what was disclosed by each patent document performs sealing processing when the bag of a process target has stopped, and presupposes what is applied to the system which transfers a bag intermittently. Therefore, it cannot be applied to a system such as a bag making and packaging machine or a filling and packaging machine that performs each process while continuously transferring bags for high speed, productivity, and other reasons.

  Moreover, as a sealing device using a bar sealer that seals a film that is continuously transferred, there is a so-called box motion type end sealing device used in a pillow packaging machine or the like. In this end seal device, sealing is performed in a direction orthogonal to the transfer direction of the tubular film. On the other hand, the sealing device targeted by the present invention seals in the same direction as the transfer direction of the bag, and the above-described end sealing device cannot be simply applied.

  In order to solve the above-described problems, a sealing device according to the present invention is (1) a sealing device that performs a seal having a length in a moving direction on a moving film, and is disposed opposite to the film. A pair of bar sealers, and a drive mechanism for revolving and moving each of the pair of bar sealers in a horizontal plane while maintaining a state in which the seal surfaces of the pair of bar sealers are opposed to each other. Arranged along the moving direction of the film, the drive mechanism revolves in a state where the bar sealer is cantilevered with respect to each of the pair of bar sealers, and the drive mechanism for each bar sealer is The rotating body that receives the output of the drive motor and rotates in a horizontal plane, the cam follower attached to the rotating body, and the cam follower are linked. And a sealer connecting portion provided on the rotating body on the opposite side of the cam follower, and the shape of the cam is such that the cam follower moves along the locus of the cam as the rotating body rotates. While the rotating body is rotating, the distance from the center of rotation to the sealer connecting portion is changed, and at least in a state where the pair of bar sealers are in contact with each other, the fixed section moves in parallel with the moving direction of the film. In the embodiment, the drive motor is a servo motor, and the drive mechanism for both bar sealers is operated based on the output of one drive motor. However, the drive motor may be installed in the drive mechanism of each bar sealer.

  Sealing having a length in the moving direction can be performed on the continuously conveyed film (bag). Therefore, since it is not necessary to temporarily stop, it can respond to high-speed driving. In addition, according to the drive mechanism, since the rigidity received by receiving the load received from the cam follower at the time of sealing at a portion having high strength in the cam can be improved, rattling can be achieved even if the bar sealer is supported in a cantilever state. Can be suppressed. Furthermore, since the drive mechanism that revolves and moves the pair of bar sealers along a predetermined trajectory supports each bar sealer in a cantilevered manner, the drive mechanism for each bar sealer can be arranged separately on both sides of the film to be sealed. . As a result, there is no motor, gear, or the like that constitutes the driving device in the upper space of the film traveling path, so that the lubricating oil applied between the gears enters the inside from the film portion (opening portion of the bag) that is sealed. There is no fear.

(2) The rotating body includes a rotation support base that rotates in response to the output of the drive motor, and a rotary plate that is disposed on the upper surface of the rotation support base so as to be reciprocally movable in a horizontal plane via a slider.
It is preferable that the distance from the rotation center to the sealer connecting portion varies as the rotating plate is displaced from the rotation center of the rotation support base by the slider.

  (3) As a drive mechanism for one bar sealer, two sets of drive units including the rotating body, the cam follower, and the cam and the sealer connecting unit are prepared, and the two sets of drive units are arranged in the moving direction of the film. It is preferable that the sealer connecting portions of the two sets of drive units are connected to each other by a connecting member, and the bar sealer is cantilevered by the connecting member. In this case, a cantilever-supported bar sealer is preferable because it operates more stably and without rattling.

  (4) The pair of bar sealers are linked by a guide mechanism that inhibits relative movement in a direction parallel to the seal surfaces of each other and allows relative movement in a direction in which both seal surfaces approach and separate. It is good to. By doing so, both the bar sealers are integrated, so that the operation is stabilized without any rattling.

  (5) The film may be a bag having an opening at the top. In the embodiment, the continuously conveyed bag body is sealed, but the film to be sealed in the invention such as (1) may of course be other than the bag body.

  The present invention can perform a seal having a length in the moving direction on a continuously moving film without temporarily stopping the film, and can cope with high speed operation.

It is a top view which shows the example of a position of the system with which the sealing apparatus which concerns on this invention is applied. It is a figure which shows the bag body of a process target, (a) is the front view, (b) is the side view. It is a perspective view which shows suitable one Embodiment of the sealing device which concerns on this invention. It is the front view. FIG. It is the side view. It is AA sectional drawing. It is a figure explaining an effect | action.

  FIG. 1 shows an example of a bag making and filling machine to which a sealing device according to the present invention is applied. As shown in FIG. 1, this bag making filling and packaging machine includes a bag making apparatus 11 that manufactures a bag body using a belt-like packaging film disposed on the upstream side, and a bag that is sequentially carried out from the bag making apparatus 11. And a filling and packaging apparatus 12 that opens an opening to the body, fills the product, and performs a sealing process.

  The bag making apparatus 11 of the present embodiment folds the position as appropriate while continuously transporting the belt-shaped packaging film and seals and cuts the bag body with the upper part opened and the lower part and the left and right side edges closed. Make a bag. For example, as shown in FIG. 2, the bag body 1 has a rectangular shape as a whole and is folded back on the bottom side to have a W-shaped cross section. Both side edges 1a are sealed in a substantially band shape, and the bottom 1b side is sealed in an arc shape. Thereby, when it finally becomes a package, a bottom part opens and it becomes possible to become independent. And the manufactured bag 1 is continuously carried out from the bag making apparatus 11 without pausing at regular intervals.

  The filling and packaging apparatus 12 receives a bag body sequentially carried out from the bag making apparatus 11 one by one and continuously conveys the bag body through a predetermined path, and is disposed in the middle of the conveyance path of the conveying apparatus 13. A bag opening device 14 that opens the opening, a package supply device 15 that is disposed on the downstream side of the bag opening device 14 and that fills the package in the bag with the opening open, and downstream of the package supply device 15 A sealing device 16 or the like is provided that closes and seals the opening of the opened bag body disposed on the side.

  The transport device 13 is configured such that clamps 21 are attached at regular intervals to an endless chain 20 that continuously travels horizontally along a predetermined locus. In the present embodiment, the movement trajectory (arrangement layout) of the chain 20 is not a general circle or ellipse, but is a shape in which the travel path is bent. In this configuration, chain guides that define the trajectory of the travel path are arranged on both the left and right sides of the travel path constituting the chain 20. A pair of rollers is arranged on the pins constituting the chain with a gap in the axial direction of the pins, and these rollers come into contact with any of the inner surfaces of the chain guides arranged on the left and right sides of the traveling path. That is, a step is provided on the inner surface of the inner chain guide, a portion facing the upper roller is dented, and a portion facing the lower roller protrudes. Further, a step is provided on the inner surface of the outer chain guide, and the portion facing the upper roller protrudes and the portion facing the lower roller is dented. Therefore, when the chain travels, the upper roller contacts the outer chain guide but does not contact the inner chain guide. On the other hand, the lower roller contacts the inner chain guide, but does not contact the outer chain guide. As a result, the chain is guided by the chain guide and moves along a route defined by the chain guide.

  The opening / closing device 14 includes a pair of suction cups (a first suction cup 14a and a second suction cup 14b) and a driving device 14c that rotates and moves the first and second suction cups 14a and 14b along a predetermined locus in a horizontal plane. The drive device 14c uses a servo motor as a drive source, a pair of rotating bodies (gears 14d and 14e: hidden by a cover in FIG. 1) that rotate in a horizontal plane by the rotation output of the servo motor, and the gears 14d and 14e. And a pair of connecting members 14f and 14g arranged so as to extend toward the movement path of the bag body 1 in cooperation with the eccentric positions. First and second suction cups 14a and 14b are attached to the tips of the connecting members 14f and 14g, respectively. As a result, the first and second suction cups 14a and 14b attached to the pair of connecting members 14f and 14g come close to each other while maintaining the state where the suction surfaces face each other as the pair of gears 14d and 14e rotate. The surface comes into contact with and adsorbs both outer surfaces of the opening of the bag body 1 and moves away while following the movement of the bag body 1 in the adsorbed state. Therefore, the opening part of the bag body 1 is pulled and opened by the first and second suction cups 14a and 14b.

  Further, the distance between both ends of the clamp 21 of the transport device 13 is narrowed in accordance with the opening operation of the first and second suction cups 14a and 14b, so that the opening of the bag body 1 is easily opened. And since the conveyance apparatus 13 moves the clamp 21 in the state which narrowed the space | interval of the both ends of the clamp 21 in this way after passing the bag opening apparatus 14, the bag body 1 is transferred with the opening part opened. Is done.

  The package supply device 15 tilts the cup by gradually tilting the cup while moving the semicircular locus while holding the cup to which the packaged items such as snacks are supplied in a fixed amount. The article to be packaged supplied inside is supplied into the bag body from the opening of the bag body. This packaged article supply apparatus 15 conveys the rotary product filling apparatus main body 17 in which the traveling path of the chain 20 is arranged inside the arc-shaped region, and the cup 3 to which the packaged article is supplied, and the cup 3 is provided with a cup transport and supply device 18 for sequentially passing 3 to the rotary product filling device main body 17 and a cup unloading device 19 for receiving and transporting empty cups 3 transported from the rotary product filling device main body 17. Although not shown, an article supply device for the cup is arranged between the downstream side of the cup carry-out device 19 and the upstream side of the cup conveyance supply device 18, and a plurality of quantified amounts constituting the packaged item are arranged. Articles are fed into the cup. Thereby, the to-be-packaged product supply apparatus 15 supplies a fixed quantity of to-be-packaged object to a cup with the said article supply apparatus first. And the cup conveyance supply apparatus 18 conveys the cup containing the to-be-packaged article in a single line, and passes the said cup to the rotary type product filling apparatus main body 17 one by one from the head in time. The cup passed to the rotary product filling device main body 17 moves along the circumference. At this time, the cup is tilted by gradually inwardly inclining from the horizontal state while the bottom is held by one of a plurality of circulating carriers, and finally the entire bottom of the cup is Located above the upper opening of the cup. Therefore, the article to be packaged in the cup falls from the cup and fills the bag. Thereafter, the carrier gradually returns to a horizontal state, so that the bottom of the empty cup is lowered and the cup posture is restored. The cup carry-out device 19 receives the empty cup 2 carried out from the rotary product filling device main body 17 and conveys it in a single row to carry the article supply device for the cup.

  The sealing device 16 for sealing includes a primary sealing device 22 and a secondary sealing device 23 for cooling that are arranged along the transfer direction of the bag body 1. Both the primary sealing device 22 and the secondary sealing device 23 include a pair of bar sealers and a drive device that revolves the bar sealers along a predetermined locus in a horizontal plane. The bar sealer is disposed so as to extend in the same direction as the direction in which the bag is transferred. Then, the pair of bar sealers approach each other to pinch the upper end of the bag body 1 and move in the transfer direction in accordance with the transfer of the bag body 1 in that state, and then the bar sealers separate from each other and the phase direction of the bag body Moves in the opposite direction to return to the original position. As a result, the primary sealing device 22 performs a sealing process by sandwiching the upper end of the bag body with a pair of bar sealers for a certain period of time and heating and pressurizing, and the secondary sealing device 23 sandwiches the seal portion with a water-cooled bar sealer. Cooling is performed, and the sealing eyes are formed by the gozails formed on the sealing surface.

  Further, a hole punch device 24 and a trimming cutter device 25 are disposed on the downstream side of the sealing device 16. The hole punch device 24 punches out the central portion sealed by the seal device 16 to form a hole. The trimming cutter device 25 performs a process of cutting the corners of the bag body into a curved shape. As a result, the pouch 4 in which the item to be packaged is hermetically stored is manufactured. The non-defective pouch 4 is discharged to the carry-out conveyor 26. The defective pouch 4 ′ is discharged by the defective product discharge conveyor 27. Further, the pass / fail judgment of the pouch manufactured by the pass / fail judgment device provided at a predetermined position of the traveling path of the transport device 13 is performed, and the pouch 4/4 ′ is discharged to any conveyor 26/27 in response to the pass / fail judgment result. The

  Next, a more specific embodiment of the sealing device 16 will be described with reference to FIG. As described above, the sealing device 16 includes the primary sealing device 22 and the secondary sealing device 23, and both the sealing devices 22 and 23 have the same configuration except for the bar sealer. Therefore, the primary sealing device 22 will be described as an example.

  The primary sealing device 22 includes a pair of bar sealers (a first bar sealer 31 and a second bar sealer 32) that are disposed opposite to the left and right of the travel path of the bag body, and the sealing surfaces 31a, 31a, 32 of the first and second bar sealers 31, 32, respectively. Each is revolved in a horizontal plane while maintaining the state where the surfaces 32a face each other.

  The driving device for revolving the first and second bar sealers 31 and 32 is positioned below the traveling path of the bag. The first and second bar sealers 31 and 32 are cantilevered in a state of projecting upward by the driving device and are rotated. By doing so, there is no motor, gear, or the like that constitutes the drive device above the bag body that is transported along the traveling path, so that lubricating oil or the like applied between the gears passes through the bag body from the opening of the bag body. There is no risk of entering the body.

  This drive device is configured as follows. First, a main frame is formed from a bottom plate 35 and side plates 36 standing on both sides of the bottom plate 35. In the main frame, a motor base 37 is connected so as to extend between both side plates 36. A servo motor 38 is fixed to the motor base 37 with a motor mounting plate 39.

  A drive base 40 is disposed above the motor base 37. Both ends of the drive base 40 are connected to a pair of side plates 36, respectively. Further, an upper plate 42 protruding inward is connected to the upper end of the side plate 36. The tip of the upper plate 42 (on the side not connected to the side plate 36) is supported by a column portion 43 that is erected on the upper surface of the drive base 40.

  Between the drive base 40 and the upper plate 42, two cam portion bearings 44 are arranged along the bag transfer direction. A cam rotation shaft 45 is rotatably mounted on each cam portion bearing 44. The lower end of the cam rotation shaft 45 projects below the cam portion bearing 44 (drive base 40), and the transmission gear 46 is connected. The transmission gears 46 arranged on the same upper plate 42 side are arranged in a separated state.

  A first bearing 47 and a second bearing 48 are attached to the lower surface of the drive base 40, respectively. The output shaft of the servo motor 38 is linked to the drive gear 50 supported by the first bearing 47. A driven gear 51 is rotatably supported on the second bearing 48. The drive gear 50 meshes with the driven gear 51 and each of the two adjacent transmission gears 46. Further, the driven gear 51 meshes with each of the two adjacent transmission gears 46. As a result, when the servo motor 38 rotates, the rotational force is transmitted from the drive gear 50 to the driven gear 51 and thus to the two transmission gears 46 that mesh with the driven gear 51, and the cam rotation shaft 45 to which the four transmission gears 46 are connected. Synchronously rotates in a predetermined direction.

  A cam mechanism is linked to the upper end of the cam rotation shaft 45. The cam mechanism is configured as follows. A rotation support base 60 is connected to the upper end of the cam rotation shaft 45 so that the cam rotation shaft 45 and the rotation support base 60 rotate together. A substantially rectangular rotating plate 62 is attached to the upper surface of the rotation support base 60 via a slider 61. Here, a guide rail extending in the longitudinal direction is attached to the lower surface of the rotating plate 62, and a slide block linked to the guide rail is attached to the center position of the upper surface of the rotation support base 60. A slider 61 is constituted by the guide rail and the slide block. Therefore, when the cam rotating shaft 45 rotates, the rotation support base 60 integrated with the cam rotating shaft 45 and the rotating plate 62 linked via the slider 61 also rotate.

  A cam follower 64 is attached to one end in the longitudinal direction of the rotating plate 62 via an L-shaped connecting bracket 63. The cam follower 64 is positioned at a position lower than the rotating plate 62 by the connecting bracket 63. The cam follower 64 contacts a cam surface 65 formed on the inner peripheral surface of a substantially oval opening provided in the upper plate 42. The distance from the rotation center of the cam rotation shaft 45 (rotation support base 60) to the cam surface 65 differs in the circumferential direction. Therefore, the rotating plate 62 is appropriately reciprocated in the radial direction by the slider 61 while rotating.

  A connecting block 66 is fixed to the upper surface of the other end of the rotating plate 62. The connection block 66 has a connection pin 66a upright at its upper end. A sealer connection holder 68 is attached so as to straddle a connection pin 66a provided on a pair of rotating plates 62 arranged on the same upper plate 42 side. Thus, the pair of connection pins 66a are connected by the sealer connection holder 68 as a connection member in claim 3, and the relative position (distance between the pair) of the pair of connection pins 66a is fixed. That is, the connection pin 66a moves along a predetermined locus as the rotating plate 62 rotates, but the pair of connection pins 66a perform such movement while maintaining a state parallel to the bag transfer direction.

  And the 1st bar sealer 31 and the 2nd bar sealer 32 are fixed to the front-end | tip of the sealer connection holder 68 via the sealer mounting base 70. The sealer mounting base 70 and the first and second bar sealers 31 and 32 are arranged in parallel to the line connecting the corresponding pair of connecting pins 66 a by the sealer connecting holder 68. Therefore, the seal surfaces 31a and 32a of the first and second bar sealers 31 and 32 are also parallel to each other and parallel to the transfer direction of the bag body.

  Furthermore, a guide rail is mounted on the upper surface of the sealer coupling holder 68 on the first bar sealer 31 side. The guide rail 75 extends in a direction perpendicular to the bag transfer direction. The slider block 76 is linked to the guide rail 75 so as to freely reciprocate. The slider block 76 is connected to a sealer connection holder 68 on the second bar sealer 32 side by a holder 77. As a result, the first bar sealer 31 and the second bar sealer 32 are linked together to prevent relative movement relative to the seal surfaces 31a and 32a (in the bag transfer direction), and both the seal surfaces 31a and 32a approach and separate. Directional movement is stably guided.

  Furthermore, as the rotating plate 62 rotates, the cam follower 64 moves along the cam surface 65. As described above, the cam follower 64 moves from the cam rotation shaft 45 (rotation support base 60) at each position in the circumferential direction of the cam surface 65. Since the distance gradually changes, the rotation center of the rotating plate 65 moves while rotating. Thereby, the position of the connecting pin 66a rotates around the cam rotation shaft 45, but the distance from the rotation center changes depending on the rotation angle position. Thereby, the 1st bar sealer 31 and the 2nd bar sealer 32 move along a fixed section and the transfer direction of a bag body in the state where seal surfaces 31a and 32a contacted each other, and take a locus which separates after that.

  Further, the detection gear 52 is coaxially linked to the driven gear 51 so as to hang downward, and two detection plates 53 are attached to the detection shaft 52 in the vertical direction. A sensor 54 disposed adjacent to the detection plate 53 detects the detection plate 53. Based on the output of the sensor 54, a controller in the control panel (not shown) recognizes the rotational angle position of the driven gear 51 and controls the rotational operation of the servo motor 38. Thus, while the first and second sealers 31 and 32 are in contact with the bag body 1, the moving speed of the first and second sealers 31 and 32 is controlled to be equal to the transfer speed of the bag body 1. To do.

  Next, the operation of the sealing device having the above-described configuration will be described. As shown in FIG. 8A, when the cam follower 64 is located closest to the travel path of the bag body 1, the connecting pin 66a is located farthest from the travel path. The 2 bar sealer 32 is the most distant position. This is the reference position.

  When the cam rotation shaft 45 rotates 90 degrees from this reference position, as shown in FIG. 8B, the first bar sealer 31 and the second bar sealer 32 approach each other while moving upstream in the bag transfer direction. When the cam rotation shaft 45 is further rotated by 90 degrees, the cam follower 64 reaches the position farthest from the travel path of the bag body 1, and accordingly, the connecting pin 66 a is positioned at the position closest to the travel path, and the first bar sealer 31 and the seal surfaces 31 a and 32 a of the second bar sealer 32 sandwich the opening of the bag body 1. The seal surfaces 31a and 32a of both the bar sealers 31 and 32 are in contact with the bag body on the front side of the position shown in FIG. The state of contact from the state of FIG. 8C until the cam rotation shaft 45 rotates by a predetermined angle is maintained. Even in such a contact, both bar sealers 31 and 32 follow the rotation of the cam rotating shaft 45 and move in the bag body transfer direction. It heats and pressurizes with the sealing surfaces 31a and 32a to securely seal.

  In addition, when the sealing surfaces 31a and 32a of the first bar sealer 31 and the second bar sealer 32 sandwich the opening of the bag body 1, the bag body 1 is pressurized, so both the bar sealers 31 and 32 are resistant to the pressure. A force is applied to the rotating body 62 and finally applied to the cam surface 65 from the cam follower 64. When the pair of bar sealers 31 and 32 are in contact with each other, the cam follower 64 is in the most separated state as described above. At this time, the direction of the force (reaction force) applied from the cam follower 64 to the inner surface of the cam surface 65 is a direction away from each other as indicated by an arrow F in the figure. In the direction of the force, there is a portion where the thickness of the upper plate 42 is wide, and the thickness can be further increased by increasing the length of the upper plate 42 to easily increase the strength. Therefore, it is possible to easily increase the pressure when the both bar sealers 31 and 32 are sandwiched and increase the seal strength.

  When further rotated 90 degrees from the state of FIG. 8C, the first bar sealer 31 and the second bar sealer 32 are separated from each other as shown in FIG. 8D. Thereby, the opening of the bag body is hermetically sealed.

16 Sealing device 22 Primary sealing device 23 Secondary sealing device 31 First bar sealer 32 Second bar sealer 38 Servo motor

Claims (5)

A sealing device that seals a moving film with a length in its moving direction,
A pair of bar sealers that are arranged to face each other with the film interposed therebetween, and a drive mechanism that revolves each other in a horizontal plane while maintaining a state in which the seal surfaces of the pair of bar sealers face each other.
The pair of bar sealers are arranged so that the longitudinal direction of the sealing surface is along the moving direction of the film,
The drive mechanism revolves in a state where the bar sealer is cantilevered with respect to each of the pair of bar sealers,
The drive mechanism for each bar sealer includes a rotating body that rotates in a horizontal plane in response to the output of the driving motor, a cam follower attached to the rotating body, a cam associated with the cam follower, and the cam follower in the rotating body opposite to the cam follower. A sealer connecting part provided on the side,
As the shape of the cam, the distance from the rotation center to the sealer connecting portion varies while the rotating body rotates while the cam follower moves along the locus of the cam as the rotating body rotates, at least, The sealing device according to claim 1, wherein the fixed section moves in parallel with the moving direction of the film while the pair of bar sealers are in contact with each other.
Bag opening device. The rotating body includes a rotation support base that rotates in response to the output of the drive motor, and a rotation plate that is disposed on the upper surface of the rotation support base so as to be able to reciprocate in a horizontal plane via a slider.
The sealing device according to claim 1, wherein a distance from the rotation center to the sealer connecting portion is changed by the displacement of the rotation plate from the rotation center of the rotation support base by the slider.   As a drive mechanism for one bar sealer, two sets of driving units including the rotating body, the cam follower, and the cam and the sealer connecting unit are prepared, and the two sets of driving units are arranged along the moving direction of the film. The seal according to claim 1 or 2, wherein the sealer connecting parts of the two sets of drive parts are connected to each other by a connecting member, and the bar sealer is cantilevered by the connecting member. apparatus.   The pair of bar sealers are linked by a guide mechanism that inhibits relative movement in a direction parallel to the seal surfaces of each other and allows relative movement in a direction in which both seal surfaces approach and separate. The sealing device according to any one of claims 1 to 3.   The said film is a bag body which has an opening part in the upper part, The sealing device in any one of Claims 1-4 characterized by the above-mentioned.

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