JP5350865B2 - Center seal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To omit any opening/closing work to be independently executed for a press roller when passing a film, and to eliminate the possibility of any defective seal by starting the operation while the press roller is not contact with the film caused by forgetting of closing. <P>SOLUTION: A center seal device includes: a pair of center sealers 34 for heating both edges of a strip film formed in a cylindrical shape while the film is held from both sides; and a press roller 35 which is located on the downstream side of the center sealers to hold a film part heated by the center sealers from both sides in a pressed state. The center sealers and the press roller are integrally supported and integrally opened/closed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a center seal device used in an automatic packaging machine.

  A pillow packaging machine, which is one form of a packaging machine, has the following configuration. First, the strip-shaped film wound up by the raw fabric roll is continuously supplied to the bag making device, and when the bag making device is passed, the tubular film formed into a tubular shape is formed. In addition, an article transporting and supplying device is arranged on the upstream side of the bag making device, and an object to be packaged conveyed at predetermined intervals from the object to be packaged conveying and supplying device is supplied into the bag making device. Accordingly, when the article to be packaged passes through the bag making machine, the article to be packaged is stored at predetermined intervals in the cylindrical film, and the article to be packaged is conveyed together with the cylindrical film. A center seal device and an end seal device are arranged along the conveying direction. The center seal device seals the film polymerization end of the tubular film. The end seal device seals the tubular film in the lateral direction of travel (portion where the front and rear packages are not present) and cuts the portion of the tubular film in which the front package is stored. Is separated from the subsequent cylindrical film to produce a package.

  There exists a thing like patent document 1 as a prior art example of this kind of center seal apparatus. The apparatus disclosed in Patent Document 1 performs vertical sealing by pinching the film end with a press roller provided on the downstream side of the center sealer. The press roller opens and closes a roller attached to be rotatable with a lever. When the press roller is closed, a pressing force is applied by the urging means, and the film polymerization end heated by the center sealer is pressed to perform center sealing. Further, the press roller mounting shaft is eccentric, thereby adjusting the clamping pressure of the press roller.

Reality 5-18129

  However, prior to the start of operation, the film polymerization end is inserted and arranged between the center sealer and between the press rollers. However, since the opening and closing amount of the press roller is narrow, the operation of passing the film between them is troublesome and takes time. There is a problem.

  Further, it is necessary to open the press roller when passing the film and close the press roller when the film has passed, but there is a risk of forgetting to close the press roller. And if it forgets to close, naturally, since the film superposition | polymerization edge part cannot be pinched with a press roller, there also exists a subject that it becomes a sealing defect.

  Furthermore, the adjustment of the clamping pressure performed when replacing the parts of the press roller is complicated, and there is a problem that the reproducibility of the sealing pressure is lacking.

In order to solve the above-described problems, the present invention provides (1) a means for forming a continuously supplied belt-like film into a cylindrical shape, and sealing the polymerization end of the cylindrical film formed in the cylindrical shape. The center seal device used in an automatic packaging machine provided with a center seal device and an end seal device installed on the downstream side of the center seal device to seal and cut in the width direction of the tubular film, A pair of center sealers that sandwich and heat the overlapping end from both sides, a press roller that is positioned downstream of the center sealer and that sandwiches a film portion heated by the center sealer from both sides, and the center sealer wherein the press roller is supported integrally with the support mechanism for opening and closing them center sealer and the press roller together, Bei example, said press roller and Changing the rotation plane can be configured.

  In this way, by attaching the press roller to the center sealer integrally, it is not necessary to open and close the press roller when passing the film, and if the press roller is forgotten to close, the operation starts with the press roller in non-contact with the film. The possibility of generating defects etc. is eliminated as much as possible. In addition, the center sealer said by this invention should just have the function to heat a film at least. That is, in the case of heat sealing, it is not necessary to melt the film by heating it against the polymerized ends of the film, and the melted films are bonded (fused) by pressing the film while heating or thereafter. For the first time. And in the case of a rotary sealer in the form of a disk (roller), many have a function of being sandwiched while being pressurized with a predetermined pressure. On the other hand, in the bar-shaped bar sealer shown in the embodiment, since it is in surface contact with the film, it is heated in contact with and close to the film, but in order to ensure sealing, it is necessary to sandwich it by applying pressure thereafter, The pressurizing process is performed with a press roller. In this case, the bar sealer has a function to heat but does not have a function to pressurize. The center sealer referred to in the present invention only needs to have a heating function, and therefore includes both a rotary roller type and a bar sealer. In the case of a rotary roller type, sealing can be performed by pressurizing while heating, but by pressing with a press roller having no heating function after that, pressurization can be performed while cooling, so that sealing can be performed more reliably.

  (2) The support mechanism may use an air cylinder as a drive source for opening and closing the center sealer and the press roller, and numerically control the pressure with which the press roller pressurizes the film portion.

  As described above, the air cylinder is used for the opening / closing operation of the center seal device (center sealer, press roller), thereby enabling numerical control of the pressure with which the film is sandwiched between the press rollers. Moreover, the pressure which pinches | interposes a film can be set for every product, and generation | occurrence | production of the sealing defect resulting from the physical property of a film can be prevented. Even when the press roller is replaced, the pressure is reproducible.

  (3) A cooling means for cooling the press roller may be provided. By providing a cooling means for the press roller, it is possible to reduce the temperature rise of the press roller due to the heat of the center sealer during operation, and the solidification of the sealing portion of the package is promoted to ensure the sealing. be able to. In particular, since the center sealer and the press roller are integrally supported, they may be close to each other, and the press roller is likely to be affected by the heat of the center sealer. Can be suppressed.

If you can change the rotation plane before Symbol press roller, rotating surface by changing, sandwiched in a direction urging the film portion can be obliquely are, it seals the film part width (protrusion By adjusting the amount, the width of the package can be finished to a desired dimension by appropriately setting the width of the film that wraps the article to be packaged.

  (5) The center sealer can be a bar-shaped bar sealer.

  According to the present invention, the press roller is integrally attached to the center sealer so that it can be opened and closed together. Therefore, when the film is passed, an opening / closing operation performed independently on the press roller is not required (in synchronization with the opening and closing of the center sealer). The press roller also opens and closes), and forgetting to close it causes the press roller to start operation with no contact with the film, eliminating the possibility of causing a sealing failure or the like as much as possible.

1 is an overall view showing a preferred embodiment of the present invention. It is a front view which shows the center seal apparatus vicinity. FIG. It is the side view (closed state). It is the side view (flat plate state). It is a top view which shows the mechanism which opens and closes and supports a center sealer and a press roller. It is a figure explaining an effect | action. It is a figure explaining an effect | action.

  The horizontal pillow packaging machine 10 according to the present embodiment is disposed on the upstream side of the packaging machine body 11, the film supply device 12 that continuously supplies a belt-like packaging film to the packaging machine body 11, and the packaging machine body 11. And a packaged article transport and supply device 14 that supplies the packaged article 13 to the packaging machine body 11 at predetermined intervals.

  The film supply device 12 links the output of a drive motor (not shown) (speed-controllable motor such as a servo motor) to the original roll 16 obtained by winding the belt-like film 15 into a roll. Supplying to the packaging machine body 11 at a constant speed while appropriately controlling the rotation speed. Further, various rollers are arranged at predetermined positions from the original fabric roll 16 to the packaging machine body 11, and the belt-like film 15 fed out from the original fabric roll 16 is passed over the rollers, thereby passing through a predetermined path. To the packaging machine body 11. Of course, in the present invention, it is not always necessary to link the drive motor to the raw roll 16, and a feed roller may be provided on the transport path of the packaging film and pulled out. And in this embodiment, although the film supply apparatus 12 has taken the aspect of the reverse pillow packaging machine arrange | positioned under the packaging machine main body 11, this invention arrange | positions a film supply apparatus above a packaging machine main body. Of course, the normal type is also acceptable.

  The package transporting and supplying device 14 includes a sprocket 17 (only the front in the traveling direction is shown in the figure) arranged at the front and rear, an endless chain 18 spanned over the plurality of sprockets 17, and a predetermined pitch on the endless chain 18. It is comprised by the several pushing finger | toe 19 attached for every. Thereby, when the pushing finger 19 hits the rear surface of the article 13 to be packaged, the article 13 also moves forward with the movement of the pushing finger 19.

  The packaging machine main body 11 includes a bag making machine 20 for making the supplied belt-like film 15 into a tubular film 21, and a belt conveyor 23 for conveying the tubular film 21 disposed on the downstream side of the bag making machine 20. A center seal device 24 installed at a predetermined position above the belt conveyor 23, an upper restraining belt 25 disposed above the belt conveyor 23 and downstream of the center seal device 24, and downstream of the belt conveyor 23. An end seal device 30 disposed and a carry-out conveyor 26 disposed on the downstream side of the end seal device 30 are provided.

  The bag-making device 20 allows the side film edges 15a of the belt-like film 15 to contact (polymerize) with each other by passing the belt-like film 15 continuously supplied from the film feeding device 12, and the tube that has become cylindrical. Bag-like film 21 is made. In addition, the articles to be packaged 13 that are sequentially supplied from the article to be packaged supply apparatus 14 to the packaging machine main body 11 are inserted into the bag making machine 20. Thereby, the article 13 to be packaged supplied to the bag making machine 20 is arranged in the cylindrical film 21 at predetermined intervals. Moreover, in this embodiment, since the film supply apparatus 12 was arrange | positioned under the packaging machine main body 11, both the side edge parts 15a of the strip | belt-shaped film 15 are located above the cylindrical film 21. FIG.

  The center seal device 24 seals both side edge portions 15a of the polymerized belt-like film 15. That is, in this embodiment, the both side edge portions 15 a of the belt-like film 15 are formed so as to protrude above the tubular film 21 by passing through the bag making device 20. Therefore, the center seal device 24 is installed at a predetermined position above the tubular film 21. The center seal device 24 includes a pair of rectangular parallelepiped center sealers (bar sealers) 34, and heats the pair of center sealers 34 with both side edge portions 15a of the belt-like film 15 sandwiched from both sides. The sandwiched film parts (side edge 15a) are melted in contact with each other. Further, a pair of press rollers 35 is disposed on the downstream side of the center sealer 34, and pressurizes both side edge portions 15 a of the melted strip-shaped film 15. Thereby, the both side edge portions 15a are heat-sealed and integrated into a center seal portion 21a.

  Further, a first pinch roller 33 is provided on the upstream side of the center seal device 24 and between the bag making machine 20. A driving force from a driving motor (not shown) is transmitted to the first pinch roller 33. The first pinch roller 33 sandwiches both side edge portions 15a of the belt-like film 15 and gives a conveying force. The end edge 15a is stably guided to the next stage center sealer 24a. A second pinch roller 32 is disposed downstream of the center seal device 24. The second pinch roller 32 is also transmitted with a driving force from a driving motor (not shown), which may be the same as or different from the driving motor for the first pinch roller 33, and passes through the center seal device 24. The center seal portion 21a of the subsequent tubular film 21 is sandwiched and a conveying force is applied so that the side edge portion 15a smoothly passes through the center seal device 24 so that the tubular film 21 moves forward.

  The upper restraining belt 25 is arranged in the immediate vicinity of the upstream side of the end seal device 30 and suppresses the article 13 in the tubular film 21 from being lifted upward so that it can be conveyed while maintaining a horizontal state. ing.

  The end seal device 30 seals and cuts the tubular film 21 in a direction orthogonal to the traveling direction, that is, in a transverse direction. The film part to be sealed / cut is a predetermined position between the front and back objects 13 to be packaged. Thereby, the head part of the cylindrical film 21 is isolate | separated from the subsequent by passing the end seal apparatus 30, and the package body 27 is manufactured.

  2, the center seal device 24 includes a pair of bar-shaped center sealers 34 and a pair of disk-shaped press rollers 35 that are linked to a machine frame 36 and are integrated by an opening / closing support mechanism. It opens and closes.

  That is, as shown in FIG. 4 and the like, the pair of center sealers 34 are fixed to the lower surfaces of the first support plate 51 and the second support plate 52, respectively. The first support plate 51 has a strip-shaped flat plate portion 51a disposed so as to extend in the film conveyance direction, and a diagonal plate disposed obliquely outward and upward from a side edge (second support plate 52 side) of the strip-shaped flat plate portion 51a. The wall portion 51c and a columnar support portion 51b provided at the tip (upper end) of the inclined wall portion 51c are provided. The center sealer 34 is attached to the lower surface of the belt-like flat plate portion 51a. The inclined wall portion 51c is provided in about half of the rear side (upstream side) in the film traveling direction, and the axis of the support portion 51b is also parallel to the film traveling direction. A rotating shaft 54 is inserted and disposed in the center of the support portion 51b in the front-rear direction, and both ends of the rotating shaft 54 are rotatably supported by the machine frame 36. As a result, the first support plate 51 and thus the center sealer 34 are integrated with the rotary shaft 54 and can be rotated forward and backward about the rotary shaft 54. Further, a gear 56 is integrally connected to the rotating shaft 54 at the front (downstream side) in the film traveling direction.

  Similarly, the second support plate 52 includes a belt-like flat plate portion 52a, a slanted wall portion 52c disposed obliquely outwardly from a side edge (on the first support plate 51 side) of the belt-like flat plate portion 52a, and a slanted wall portion 52c thereof. And a columnar support portion 52b provided at the tip of the wall portion 52c. The center sealer 34 is attached to the lower surface of the belt-like flat plate portion 52a. Unlike the first support plate 51, the installation position of the inclined wall portion 52c is set to be about half of the area on the front side (downstream side) in the film traveling direction. As a result, as shown in FIGS. 3 and 6 and the like, when the belt-like flat plate portions 51a and 52a are arranged close to each other in parallel, the positions of both the inclined wall portions 51c and 52c are shifted forward and backward, thereby interfering with each other. It can be located so that it may protrude in the upper space of the other party strip | belt-shaped flat plate part 51a, 52a (refer FIGS. 3-6 etc.). The rotary shaft 55 is inserted and disposed in the support portion 52 of the second support plate 52 so as to penetrate in the front-rear direction, and both ends of the rotary shaft 55 are rotatably supported by the machine frame 36. Yes. As a result, the second support plate 52 and thus the center sealer 34 are integrated with the rotation shaft 55 and can be rotated forward and backward about the rotation shaft 55. A gear 57 is integrally connected to the rotating shaft 55 on the front side (downstream side) in the film traveling direction.

  Gears 56 and 57 attached to both rotary shafts 54 and 55 are set to mesh with each other. As a result, both the rotating shafts 54 and 55 rotate in the forward and reverse directions synchronously, so that the belt-like flat plate portions 51a and 52a, and the pair of center sealers 34 connected thereto, move away / approach and open / close.

  A swing lever 58 is attached to the front surface of the support shaft 52 b of the second support plate 52. The swing lever 58 can be rotated forward and backward with the rotation shaft 55 as the center of rotation, and a locking pin 58 a is provided at the upper end of the swing lever 58. The locking pin 58a is disposed in a direction perpendicular to the swing lever 58, that is, in a direction parallel to the film transport direction, and is connected to the tip of the cylinder rod 60 of the cylinder 61 such as an air cylinder. The annular terminal 59 is linked. One end of the cylinder 61 (the non-mounting side of the cylinder rod 61) is rotatably linked to a tip 62a of a support rod 62 connected to the machine frame 36. Therefore, as the cylinder rod 60 reciprocates, a link mechanism is formed by the cylinder rod 60 (cylinder 61) and the swing lever 58, and one end of the cylinder 61 and the lower portion of the swing lever 58 (linked to the rotating shaft 55). Therefore, when the cylinder 61 operates and the cylinder rod 61 reciprocates, the swing lever 58 rotates in the forward and reverse directions around the rotation shaft 55. The rotation is transmitted to the rotating shaft 54 side by the gears 57 and 56. Accordingly, the first and second support plates 51 and 52 and the pair of center sealers 34 connected thereto are opened and closed. The cylinder 61 operates according to a command from a controller (not shown). Specifically, for example, when the operation of the packaging machine is stopped, an operation for opening, that is, an operation in a direction in which the cylinder rod 60 is housed in the cylinder from the state of FIG. 4 is performed. Thereby, as shown in FIG. 5, a pair of center sealer 34 leaves | separates and will be in a flat plate state. On the contrary, when the operation is disclosed, the operation in the direction in which the cylinder rod 60 protrudes is performed, and the state shown in FIG. 4 is restored.

  On the other hand, the machine frame 36 is connected to a center seal device moving cylinder 66 via a connecting plate 67 and linked to a slide wall 37 formed upright on a slider 38 that moves on a guide rail 39. . The guide rail 39 is installed on a base 41 arranged so as to extend along the traveling direction of the film. As a result, the machine frame 36 and the center sealer 34 reciprocate along the traveling direction of the film together with the slider 38 reciprocating along the guide rail 39.

  A center seal device moving cylinder 66 is attached to the side wall 40 erected on the base 41. Accordingly, the cylinder rod 66a is reciprocated by the operation of the center seal device moving cylinder 66, and accordingly, the machine casing 36 and the center seal device 24 (center sealer 24a) are reciprocated along the film traveling direction. .

  Here, in the present embodiment, the press roller 35 is attached to the first support plate 51 and the second support plate 52 via the connection plate 43. That is, the connection plate 43 is attached to the outer side surfaces of the strip-shaped flat plate portions 51a and 52a. As shown in FIG. 3 and the like, the connecting plate 43 has an L-shaped planar shape, and has a narrow portion 43a having a narrow bar shape, and a wide portion 43b that is wide and continuous with one end of the narrow portion 43a. Have

  The narrow portion 43a is disposed so as to contact along the side surfaces of the strip-shaped flat plate portions 51a and 52a, and is attached to the through hole 43c provided at the other end of the narrow portion 43a and the elongated hole 43d extending in the vertical direction. The narrow width portion 43a (connection plate 43) is fixed to the strip-shaped flat plate portions 51a and 52a (first and second support plates 51 and 52) by the bolts. Since the elongated hole 43d is provided in the narrow width portion 43a, the connecting plate 43 can be rotated forward and backward within a predetermined angle range with the through hole 43c as a rotation center, and the bolt inserted into the elongated hole 43d can be closed to close the angle. Can be fixed in position. Therefore, as shown in FIG. 2 etc., the connection plate 43 can be in a horizontal state and the connection plate 43 can be inclined obliquely as shown in FIGS.

  The wide portion 43b is disposed at a position protruding forward in the traveling direction of the first and second support plates 51, 52, and protrudes inward so as to approach each other. Then, the rotary shaft 35a of the press roller 35 is inserted from the lower side into a vertically extending bearing portion provided at a predetermined position of the wide width portion 43b, and its upper end (tip) 35b is projected above the wide width portion 43b. . Accordingly, the press roller 35 is supported by the bearing in a suspended state with respect to the wide width portion 43b (the coupling plate 43), and is rotatable.

  When the first and second support plates 51 and 52 are closed, the pair of press rollers 53 come into contact (see FIG. 6A, etc.), and when the first and second support plates 51 and 52 are opened. The pair of press rollers 35 are also separated (see FIG. 6B, etc.). Further, the pair of press rollers 35 when they are closed come into contact with each other with a predetermined pressure. As a result, the film portion heated through the center sealer 34 is pressed by the press roller 35 at the predetermined pressure and heat sealed. Since the press roller 35 is supported by the first and second support plates 51 and 52 in a free state, when the film portion sandwiched between the press rollers 35 moves forward, it rotates following it. . Since the press roller 35 itself does not include a heating means, it can be surely heat-sealed by applying pressure while cooling the heated film portion.

  Furthermore, in the present embodiment, since the press roller 35 is disposed close to the center sealer 34, the surface temperature of the press roller 35 itself may rise due to heat from the center sealer 34. Therefore, the cooling nozzle 44 is installed in the wide portion 43b of the connecting plate 43, and the surface of the press roller 35 is irradiated with the cooling air sprayed from the cooling nozzle 44, thereby reducing the surface temperature and reliably heat-sealing. To be able to. The cooling air may be air that has been cooled to a low temperature of room temperature or less by providing a cooling means, but the temperature from the center sealer 34 is for melting the film and is very high (compared to room temperature). Therefore, ambient air at about room temperature may be sucked by a suction means (not shown) and jetted.

  Further, the pressure applied to the film by the press roller 35 can be set to a desired value by adjusting the pressure of the cylinder 61. Therefore, it is possible to pressurize with an appropriate pressure according to the type of film and the like with high reproducibility, and it is possible to suppress as much as possible the occurrence of poor sealing due to insufficient pressure / excessive pressure.

  The press roller 35 is made of metal such as SUS. In other words, an elastic member such as rubber can be used, but in the case of rubber or the like, there is a possibility that the pressing force when sandwiched against the film at the time of sealing changes due to aging and wear, and the pressure This is because the outer shape of the press roller 35 may be deformed and the applied pressure when sandwiched may not be constant.

  Furthermore, since it is made of metal, when the pair of press rollers 35 come into contact with each other, the position is maintained even if the cylinder 61 operates in a direction closer to it. However, by increasing the pressure in the cylinder 61, the pressure applied to the film sandwiched between the press rollers 35 increases. Then, with the press rollers 35 in contact with each other, a predetermined gap is provided between the pair of center sealers 34. Thereby, although the film site | part which exists between the center sealers 34 is heated by both the center sealers 34, it does not receive pressure more than necessary but moves forward smoothly.

  The set value of the pressing force (seal pressure) that sandwiches the film can be stored as product data for each product in a non-volatile memory or the like in the control unit. The initial setting prior to use is the setting of the pressing force stored in the non-volatile memory. The value is read and set as a control value (command value), and the cylinder 61 is controlled. Thereby, the sealing failure by the difference in physical properties, such as a film, can be prevented.

  Further, the press roller 35 is attached at the same position with respect to the surface of the sealer or a position slightly protruding from the sealing surface in order to reduce the frictional resistance between the center sealer 34 and the film.

  According to the present embodiment, when the side edge portions 15a of the belt-like film 15 are inserted and arranged in the center seal device 24 prior to the start of operation, the center sealer 34 and the press roller 35 are opened, and a desired state is obtained. After setting the state, by closing the center sealer 34, the press roller 35 is also closed. Therefore, a seal failure does not occur due to forgetting to close the press roller 35.

  Next, the effect by tilting the connection plate 43 will be described. First, as shown in FIG. 7, when the connecting plate 43 is inclined so as to gradually rise as it goes downstream in the traveling direction, the installation position of the press roller 35 and the connecting plate 43 are more than the horizontal reference position. Furthermore, since the rotation surface of the press roller 35 is also parallel to the connection plate 43, the press roller 35 is inclined upward so as to rise as it goes forward in the traveling direction. As a result, the film sandwiched between the press rollers 35 is urged and guided in a direction of rising as it goes downstream in the traveling direction.

  Accordingly, as shown in the drawing, the heated center seal portion 21a after passing through the center sealer 34 is conveyed obliquely upward, so that both side edge portions 15a that have passed through the upstream pinch roller 33 have their path. Is advanced obliquely upward, and accordingly, the width of the film portion that wraps the article 13 to be packaged, that is, the width of the final package is reduced. Since both side edge portions 15a move forward while gently rising in this way, the width (height) of both side edge portions 15a when passing through the center sealer 34 is larger than that of the standard case described above. It becomes longer and a large area is heated. And the part pinched | interposed into the press roller 35 among the heated wide area | region is pressurized and heat-sealed there. Furthermore, since the film part located in the vicinity of the article to be packaged 13 and not sandwiched between the press rollers 35 is also sandwiched by the pinch roller 32 on the downstream side, it is surely heat-sealed there. Therefore, the finally manufactured package can be narrow and narrow.

  On the other hand, as shown in FIG. 8, when the connecting plate 43 is inclined so as to gradually descend toward the downstream side in the forward direction, the installation position of the press roller 35 is also changed by the connecting plate 43 as shown in FIG. Since it is located below the horizontal reference position, and the rotation surface of the press roller 35 is also parallel to the connecting plate 43, it is arranged to be inclined downward so as to descend forward in the traveling direction. As a result, the film sandwiched between the press rollers 35 is urged and guided in a downward direction as it goes downstream in the forward direction.

  Accordingly, as shown in the drawing, the heated center seal portion 21a after passing through the center sealer 34 is conveyed obliquely downward, so that both side edge portions 15a that have passed through the upstream pinch roller 33 have their path. Is advanced obliquely downward, and accordingly, the width of the film portion that wraps the article 13 to be packaged, that is, the width of the final package is increased. Since both side edge portions 15a move forward while slowly descending in this way, the width (height) of both side edge portions 15a when passing through the center sealer 34 is larger than the standard case described above. It becomes shorter and the narrow area is heated. The heated narrow region is sandwiched between press rollers 35 and is pressurized and heat-sealed. Therefore, the package finally produced can be a wide slack.

  In the above embodiment, the opening / closing mechanism is of a swing type (rotating about the rotation shafts 54 and 55), but the present invention is not limited to this, and is a center seal device that opens and closes in parallel. Also good.

DESCRIPTION OF SYMBOLS 10 Horizontal pillow packaging machine 11 Packaging machine main body 12 Film supply apparatus 13 Packaged object 14 Packaged article conveyance supply apparatus 15 Strip | belt-shaped film 15a Both-side edge part 21 Cylindrical film 24 Center seal apparatus 30 End seal apparatus 34 End sealer 35 Press roller

Claims (4)

A means for forming a continuously formed belt-like film into a cylindrical shape, a center seal device that seals the polymerization end of the cylindrical film formed in the cylindrical shape, and installed on the downstream side of the center seal device, The center seal device used in an automatic packaging machine provided with an end seal device that performs sealing and cutting in the width direction of the tubular film,
A pair of center sealers that sandwich and heat the polymerization end from both sides,
A press roller located on the downstream side of the center sealer and sandwiching the film part heated by the center sealer in a pressurized state from both sides;
A support mechanism for integrally supporting the center sealer and the press roller, and opening and closing the center sealer and the press roller integrally;
Bei to give a,
A center seal device characterized in that the rotation surface of the press roller can be changed .   2. The support mechanism according to claim 1, wherein an air cylinder is used as a drive source for opening and closing the center sealer and the press roller, and the pressure by which the press roller pressurizes the film portion can be numerically controlled. Center seal device.   The center seal device according to claim 1, further comprising a cooling unit that cools the press roller.   The center seal device according to any one of claims 1 to 3, wherein the center sealer is a bar-shaped bar sealer.

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