JP2008044666A - Laterally sealing mechanism and vertical type filling and packaging machine equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laterally sealing mechanism or the like for a packaging bag, capable of inhibiting occurrence of contents being caught therein. <P>SOLUTION: The laterally sealing mechanism is equipped with a heater bar 21 and a heater bar receiver 24 in an opposed arrangement with a cylindrical form film 1' in between them, while the pair of members are made to sandwich the cylindrical form film in for heat-sealing, thus performing a tight sealing of the cylindrical form film 1'. The impression-surface 21a of the heater bar 21 is formed in a curved surface. The heater bar 21 is so constituted as to perform a thermal sealing as it is rotationally moved around a rotary shaft 27a, while its impression-surface 21a is kept in touch with the cylindrical film 1'. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vertical filling and packaging machine for manufacturing a bag-filled product filled with the above-mentioned contents by filling liquid or paste-like contents in a resin-made cylindrical film and appropriately heat-sealing, In particular, the present invention relates to a horizontal sealing mechanism that performs horizontal sealing in the packaging machine.

  Conventionally, various types of packaging machines for bagging liquid or paste-like contents are known, but Patent Document 1 discloses a lateral sealing mechanism as shown in FIG.

  A horizontal sealing mechanism 120 shown in FIG. 8 is a mechanism for heat-sealing the tubular film 101 into which the contents (not shown) are charged, and includes a heater bar 121 and a heater bar receiver 124. The main characteristic part of the horizontal seal mechanism 120 is that, in addition to the heater bar 121 and the heater bar receiver 124, a cooling bar 131 and a cooling bar receiver 134 facing the cooling bar 131 are further provided. The cooling bar 131 and the cooling bar receiver 134 sandwich the horizontal seal portion immediately after being formed by the heater bar 121 and the heater bar receiver 124, thereby releasing the heat of the horizontal seal portion through the cooling bar 131. Cool down.

  A specific configuration of the lateral seal mechanism 120 will be described. First, the heater bar 121 moves forward and backward with respect to the tubular film 101 using the cylinder S2 as a drive source. A cam portion 122 is provided on the lower side of the heater bar 121. The cooling bar 131 can be rotated around the shaft 135, and as shown in FIG. 8A, when the roller 123 rides on the cam portion 122, the cooling bar 131 moves downward. It will turn.

  The configuration on the heater bar receiver 124 side is the same as described above. That is, as shown in FIG. 8B, the cooling bar receiver 134 moves forward and backward with respect to the tubular film 101 using the cylinder S1 as a driving source, and the heater bar receiver 124 moves along the shaft 125 along with this movement. It is designed to rotate around.

  When heat sealing is performed by the horizontal sealing mechanism 120 configured as described above, the heater bar 121 is set to the advanced position and the cooling bar receiver 134 is set to the retracted position, as shown in FIG. Thereby, the heater bar receiver 124 moves to a position in contact with the tubular film 101, and the tubular film 101 is sandwiched between the heater bar 121 and the heater bar receiver 124. By this clamping, the tubular film 101 is heat-sealed by receiving heat from the heater bar 121, and a heat seal portion is formed.

  Next, with the film transport stopped, the state shown in FIG. That is, by setting the heater bar 121 to the retracted position, the cooling bar 131 moves to a position where it contacts the film, and on the opposite side, the cooling bar receiver 134 is set to the advanced position. As a result, the heat seal portion formed in the previous step (intended to be a heat seal portion still heated) is sandwiched between the cooling bar 131 and the cooling bar receiver 134, and the heat of the seal portion is cooled by the cooling bar. It will escape to 131 side and a heat seal part will be cooled.

  Thereafter, one packaging bag is cut from the tubular film 101 by advancing a cutter (not shown with a reference numeral) built in the cooling bar receiver 134 toward the tubular film. When the clamping by the cooling bar 131 and the cooling bar receiver 134 is released, this one separated packaging bag falls downward.

According to the horizontal sealing mechanism 120 configured as described above, the heat sealing portion can be cooled immediately after the heat sealing is performed on the tubular film 101. The conventional problem that the film stretches in the heat seal portion can be solved. In particular, heat sealing, cooling, and cutting are performed on the spot without moving the film, which is advantageous for speeding up the packaging operation and reducing the size of the packaging machine.
Japanese Patent No. 2598879

  As described above, even the horizontal sealing mechanism 120 as shown in FIG. 8 is very advantageous from the viewpoint of speeding up the packaging operation as compared with a conventional general horizontal sealing mechanism. However, in order to further improve the quality of the formed heat seal portion, it is desirable to make further improvements.

  In the conventional configuration, when the tubular film 101 is sandwiched between the heater bar 121 and the heater bar receiver 123, the contents may be left in the region 101h (see FIG. 9) to be heat sealed. This problem does not become so apparent when, for example, a liquid such as a beverage is packaged, but it may become apparent when, for example, the contents of a liquid in which a minute solid is mixed are packed. It was. That is, in the content containing solid matter, even if the liquid can escape up and down, the solid matter is relatively difficult to move and remains in the same position. If heat sealing is performed in this state, it is a matter of course that solid matter remains in the heat sealing portion, which causes a problem that the appearance of the final product is deteriorated. Moreover, depending on the case, the problem that the solid substance which remain | survived in the heat seal part may rot also arise.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lateral seal mechanism capable of suppressing the occurrence of biting of the contents into the heat seal portion (lateral seal portion) of the packaging bag, and the same. It is providing the vertical filling packaging machine provided with.

  In order to solve the above-mentioned problems, the heat sealing mechanism of the present invention includes a heater bar and a heater bar receiver arranged to face each other with a cylindrical film filled with contents, and sandwiches the cylindrical film between the heater bar and the heater bar receiver. In the horizontal sealing mechanism that seals the tubular film by heat sealing, the heater bar has a curved pressure surface that is convex toward the tubular film side, and is orthogonal to the feeding direction of the tubular film. In addition, the heater bar is configured to rotate around a rotation axis extending in a direction orthogonal to a direction of moving toward the cylindrical film.

  According to the horizontal sealing mechanism of the present invention, heat sealing is performed while the heater bar rotates, and the tubular film is heat sealed so as to be rubbed with a curved pressure surface. Therefore, it is difficult for the contents to remain in the region to be heat sealed. Therefore, the occurrence of biting of the contents into the heat seal portion (lateral seal portion) can be minimized.

  In the horizontal sealing mechanism of the present invention, the heater bar is configured such that one end side of the pressurizing surface first contacts the tubular film, and then a central portion of the pressurizing surface contacts the tubular film. The other end may be provided so as to contact the tubular film. Further, the heater bar receiver may have a flat receiving surface at a position facing the pressing surface.

  The lateral seal mechanism of the present invention more specifically includes a second gear that holds a shaft member that constitutes the rotating shaft and that engages with a first gear attached to the shaft member. A support member that holds and rotates around another rotation shaft provided separately from the rotation shaft, a member that is formed with a fixed gear that engages with the second gear, and the support member that is connected to the other rotation shaft. Drive means for moving around the rotation axis, and the second gear and the fixed gear engage with each other as the support member moves around the other rotation axis, and the second gear It is preferable that the heater bar is configured to rotate around the rotation axis when the first gear is rotated by the rotation of the gear. An air cylinder or a servo motor can be used as the drive source.

  Further, the horizontal seal mechanism is configured to cool the heat seal portion formed on the tubular film by the heater bar, after the heat seal is finished, the position facing the receiving surface of the heater bar receiver (of the heat seal portion). A cooling bar that is in contact with the heat seal portion that is moved to a position where the formation is performed, the cooling bar being disposed on the same side as the heater bar with respect to the cylindrical film, and the heater bar It may be configured to move toward the tubular film side in conjunction with the separation from the tubular film.

  The vertical filling and packaging machine of the present invention is arranged above the horizontal sealing mechanism according to the present invention, a conveying means for conveying the tubular film vertically downward, and above the horizontal sealing mechanism, and the contents are charged therein. And a pair of squeeze rollers that form an empty filling portion in the cylindrical film by rotating while sandwiching the cylindrical film and feeding the cylindrical film downward.

  Further, another vertical filling and packaging machine of the present invention is arranged above the horizontal sealing mechanism according to the present invention, a conveying means for conveying the cylindrical film vertically downward, and above the horizontal sealing mechanism. A pair of squeeze rollers for forming an empty filling portion in the cylindrical film by rotating while sandwiching the cylindrical film into which an object has been inserted and feeding the cylindrical film downward, and the lower side of the lateral seal mechanism A cylindrical film is disposed opposite to each other, and a cooling bar and a cooling bar receiver are provided to cool the heat sealing portion by sandwiching a heat sealing portion formed on the cylindrical film by the heater bar.

  As described above, according to the present invention, heat sealing is performed by squeezing the tubular film while rotating the heater bar of the horizontal sealing mechanism, so that the contents are to be sealed in the region to be heat sealed. It is difficult for objects to remain, and as a result, occurrence of biting of the contents into the heat seal portion can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view schematically showing an overall configuration of a vertical filling and packaging machine according to an embodiment of the present invention, and FIG. 2 is a front view showing a horizontal sealing mechanism of the vertical filling and packaging machine in FIG. It is. 2A shows a state when heat sealing is performed, and FIG. 2B shows a time when the heat sealing portion is cooled or cut.

  As shown in FIG. 1, the vertical filling and packaging machine 50 according to the present embodiment basically has a bag-making guide 14 for folding a sheet-like film 1 into a cylindrical shape, as in the conventional configuration. The side edges of the overlapped films are heat-sealed to form a vertical seal portion, and a transport roller 12 is provided below the vertical seal mechanism 10 for transporting the film. is doing.

  The vertical seal mechanism 10 includes a heater bar with a built-in heating means such as a heater. By heating the side edges of the film with the heater bar, the film is melted to form a heat seal portion (vertical seal portion). To do. In the present specification, the film in which the vertical seal portion is formed is referred to as “tubular film 1 ′”.

  The contents are supplied into the tubular film 1 ′ through the charging nozzle 15. Although not particularly limited, the lower end of the injection nozzle 15 is located below the conveying roller 12.

  In addition to the above, the vertical filling and packaging machine 50 in FIG. 1 has a pair of squeeze rollers 11 that can sandwich the tubular film 1 ′, and a horizontal seal mechanism 20 disposed below the pair of squeeze rollers 11. .

  The squeeze roller 11 is driven so as to sandwich an area where the charged contents are present. As a result, the contents are divided above and below the squeeze roller 11. Next, the squeeze roller 11 rotates and feeds the tubular film 1 ′ downward, whereby a flat empty filling portion 1 a is formed in the tubular film 1 ′. A horizontal seal mechanism 20 to be described later heat seals (horizontal seal) the empty filling portion 1a. As described above, a configuration in which the empty filling portion 1a is formed and this portion is heat-sealed is conventionally known. However, as an advantage of such a configuration, a flat portion is heat-sealed, so that the heat-sealing portion It is mentioned that wrinkles are less likely to occur. In addition, since the contents are separated by the squeeze roller 11, there is an advantage that air does not remain in the final bag-packed product.

  The lateral seal mechanism 20 is configured in detail as shown in FIGS. The horizontal seal mechanism 20 has the same basic configuration as that of the conventional horizontal seal mechanism 120 (see FIG. 6). However, the heater bar 21 operates as shown in FIG. 4, that is, heats while squeezing the tubular film 1 ′. It is different in that it is configured to be able to carry out an operation such as sealing. This will be specifically described below.

  As shown in FIG. 2A, the lateral seal mechanism 20 of the present embodiment has a heater bar 21 and a heater bar receiver 24. The structure of the unit on the heater bar receiving side is substantially the same as that of the conventional horizontal seal mechanism 120 (see FIG. 6), and the heater bar receiver 24 moves forward and backward with respect to the tubular film 1 ′ using an air cylinder (not shown) as a drive source. It is configured to be possible. A cam portion 32 is provided on the lower side of the heater bar receiver 24.

Cooling bar bearing 34, together rotatably about the axis 35a constructed, is biased in an arrow R ₁ direction by urging means not shown. As shown in FIG. 2A, the roller 33 provided on the support member 36 of the cooling bar receiver 34 rides on the cam portion 32 in a state where the heater bar receiver 24 is in the advanced position. Thus, the support member 36, and rotates around the opposite to the arrow R ₁ direction against the urging force of the biasing means, not shown, so that the cooling bar bearing 34 away from the tubular film 1 ' .

On the other hand, as shown in FIG. 2B, when the heater bar receiver 24 is moved to the retracted position, the cam portion 32 is also moved to the left side in accordance with this movement, so that the engagement between the roller 33 and the cam portion 32 is released. Is done. As a result, the support member 36 is rotated in the direction of the arrow R ₁ by a biasing force from a biasing means (not shown), and the cooling bar receiver 34 approaches (or comes into contact with) the tubular film 1 ′.

  Next, the configuration of the unit on the heater bar 21 side will be described. As shown in FIG. 3, the heater bar 21 according to the present embodiment has a pressurizing surface 21a formed in a curved surface shape. Precisely, the pressurizing surface 21a is a curved surface (curved surface that is convex toward the tubular film side) having a circular cross section, and its radius of curvature is, for example, 40 mm. The pressing surface 21a may be made of metal, or may be made of heat resistant high hardness rubber. The receiving surface 24a (shown in FIG. 2) of the heater bar receiver 24 is not a curved surface but a flat surface.

  The heater bar 21 is supported by a shaft member 27a, and can be rotated around a central axis (rotation shaft) of the shaft member 27a. The shaft member 27a itself is rotatably supported by the support member 26. As is apparent from FIG. 3A, the extending direction of the shaft member 27a is the horizontal direction (Y direction). The “Y direction” is a direction perpendicular to the feeding direction of the tubular film 1 ′ and perpendicular to the direction in which the heater bar 21 moves forward and backward toward the tubular film 1 ′.

  A first gear 27 is attached to the shaft member 27 a, and the heater bar 21 rotates in accordance with the rotation of the gear 27. The support member 26 is a member configured to be rotatable around the rotation shaft 25 a, and holds a second gear 28 that engages with the first gear 27. The second gear 28 is also engaged with a fixed gear 29 formed on a member 30 provided separately from the support member 26.

With such a configuration, the support member 26 is engaged with the fixed gear 29 as it rotates in the direction of the arrow R ₂ from the state of FIG. 3A to the state of FIG. The second gear 28 is rotated. As the second gear 28 rotates, the first gear 27 engaged therewith rotates by a predetermined angle, and the heater bar 21 rotates by the same angle in accordance with this rotation.

  A drive source for rotating the support member 26 around the rotation shaft 25a is not particularly limited, but may be an air cylinder, for example. Specifically, in this embodiment, two air cylinders S1 and S2 are used. Each of the air cylinders S1 and S2 is connected to a connecting portion 26a of the support member 26 that is separated from the rotating shaft 25a by a predetermined distance. Due to the action of these two air cylinders S1 and S2, the support member 26 takes the first to third postures to be described later. The unit on the heater bar 21 side is configured such that the heater bar 21 can move forward and backward with respect to the tubular film 1 ′ by using an air cylinder (not shown) as a drive source.

  The first posture of the support member 26 is the posture shown in FIGS. 4A and 4B (the same applies to FIG. 3A). When the support member 26 takes this first posture, the heater bar 21 is The upper side of the pressure surface 21a is in contact with the tubular film.

  A 2nd attitude | position is an attitude | position shown in FIG.4 (c), and this attitude | position is implement | achieved by shrink | contracting the cylinder arm only of cylinder S1 among the two cylinders S1 and S2. The stroke length of the cylinder S1 may be 10 mm, for example. When the support member 26 takes this second posture, the heater bar 21 is in a state where the lower side of the pressure surface 21a is in contact with the tubular film.

  The third posture is the posture shown in FIG. 4D, and is realized by further contracting the cylinder arm of the cylinder S2 from the second posture. The stroke length of the cylinder S2 may be 35 mm, for example. When the support member 26 takes this third posture, the heater bar 21 is positioned below the cooling bar 31 that has been set to the advanced position, and the pressure surface 21a faces substantially upward. This third posture is a posture that is taken when the tubular film 1 ′ is sandwiched between the cooling bar 31 and the cooling bar receiver 34.

  The operation of the heat sealing mechanism 20 of the present embodiment configured as described above will be described below with reference to FIGS. 4 and 5.

  FIG. 4A shows an initial state of a series of operations, and both the unit on the heater bar 21 side and the unit on the heater bar receiver 24 side are separated from the tubular film 1 '. In the unit on the heater bar 21 side, the support members 26 are in the first posture by advancing the cylinder arms (not shown) of the two cylinders S1 and S2. In the unit on the heater bar receiver 24 side, the heater bar receiver 24 is set to the retracted position, whereby the cooling bar receiver 34 faces the tubular film 1 '.

  Next, as shown in FIG. 4B, the unit on the heater bar 21 side and the unit on the heater bar receiver 24 side are brought close to the tubular film 1 ′, and at the same time, the heater bar receiver 24 is moved to the advanced position. And As a result, the tubular film 1 ′ is held between the heater bar 21 and the heater bar receiver 24, and the heat sealing operation is started.

  Next, as shown in FIG. 4C, the cylinder arm of the cylinder S1 is contracted, and the support member 26 is moved from the first posture to the second posture. The heat sealing operation in the present embodiment is performed from the state of FIG. 4B to the state of FIG. This will be specifically described with reference to FIG. 5 while focusing on the movement of the heater bar 21.

  First, as shown in FIG. 5A, the heater bar 21 is pressed against the tubular film 1 ′ in such a posture that the upper side of the pressing surface 21 a first comes into contact with the tubular film. Next, from this state, the support member 26 rotates about the rotation axis 25a by a predetermined angle, so that the heater bar 21 has a central portion of the pressure surface 21a at the cylindrical film 1 ′ as shown in FIG. 5B. Take a posture to be pressed against. By the operation so far, approximately half of the heat seal portion is formed.

  Subsequently, as the support member 26 further rotates, the heater bar 21 takes a posture such that the lower side of the pressure surface 21a is in contact with the tubular film, as shown in FIG. 5C. Thereby, all the area | regions where the pressurization surface 21a was pressed will be heat-sealed.

  As described above, in the horizontal sealing mechanism 20 of the present embodiment, the heater bar 21 presses the tubular film while rotating in this way, so that the contents present in the tubular film 1 ′ are removed. Heat sealing is performed while squeezing down. Therefore, the amount of the content remaining in the heat seal portion is minimized, and the finally obtained heat seal portion is a good one in which biting of the content is suppressed.

In particular, in the configuration of the present embodiment, the shaft member 27a that is the rotation center of the heater bar 21 is not fixed at one place, and as shown in FIGS. 5 (a) to 5 (c), the track A It is designed to move along ₂₅ . Thus, since the shaft member 27a itself moves on the track A ₂₅ and the heater bar 21 rotates around the shaft member 27a in synchronization therewith, the rubbing between the pressing surface 21a and the film is caused. Heat sealing can be performed satisfactorily without causing it.

  After the heat seal portion is formed by the above steps, the support member 26 is moved to the third posture and the cooling bar 31 is advanced as shown in FIG. In accordance with this, the heater bar receiver 24 is set to the retracted position, and the cooling bar receiver 24 is opposed to the tubular film 1 ′. This process is the same as the conventional horizontal seal mechanism, and the heat seal part is cooled by sandwiching the heat seal part formed on the tubular film between the cooling bar 31 and the cooling bar receiver 34.

  Immediately after the heat seal is finished, the heat seal part is still at a high temperature. If liquid or the like is sandwiched in the heat seal part, the heat trapped in the heat seal part is vaporized. There is also a possibility that the seal part peels off. On the other hand, according to the horizontal seal mechanism of the present embodiment, it is possible to cool the heat seal portion immediately after the heat seal, and thus such a problem is unlikely to occur. In addition, since this cooling operation is performed without carrying the cylindrical film, there is no problem that the heat seal portion is extended along with the carrying.

  Subsequently, in the state of FIG. 4 (d), a cutter (not shown) built in the cooling bar 31 is advanced to cut the center of the horizontal seal portion, whereby the bag-filled product becomes the tubular film 1 ′. Carved from. Thereafter, from the state of FIG. 4D, first, the unit on the heater bar 21 side and the unit on the heater bar receiver 24 side are retracted from the tubular film 1 ′, the cooling bar 31 is set to the retracted position, and both By returning the cylinder arms of the air cylinders S1 and S2 and setting the support member 26 to the first posture, the horizontal seal mechanism returns to the state shown in FIG.

  In the horizontal sealing mechanism 20 of the present embodiment as described above, as shown in FIG. 5, the upper side of the curved pressure surface 21a first contacts the cylindrical film, and then the central portion of the pressure surface 21a contacts. Finally, the heater bar 21 is pressed against the tubular film 1 ′ so that the lower side of the pressing surface 21a comes into contact therewith. According to the configuration in which heat sealing is performed while the heater bar rotates in this way, heat sealing is performed while squeezing down the contents in the tubular film. (Solid matter contained) is less likely to bite.

  Contrary to the order shown in FIGS. 5A to 5C, first, the lower side of the pressure surface 21a is brought into contact as shown in FIG. 5C, and then the state shown in FIG. In particular, even when the heater bar 21 is operated so as to be in the state of FIG. 5A, it is possible to obtain the effects as described above. However, as shown in FIGS. 5 (a) to 5 (c), it is considered that the above-described operation and effect can be obtained more effectively when the operation is performed from the upper side toward the lower side.

<Modification>
When attention is paid to the above-described operation and effect due to the heater bar 21 being pressed against the tubular film while rotating, the lateral seal mechanism of the present invention is not necessarily configured to include the cooling bar 31 and the cooling bar receiver 34. Absent. As long as the pressurizing surface 21a is formed in a curved surface and can perform heat sealing while rotating as shown in FIG. 5, heat sealing can be performed while squeezing the contents, as described above. It becomes.

  In the present embodiment, as shown in FIG. 3, the air cylinders S <b> 1 and S <b> 2 are used as a drive source for moving the support member 26. When an air cylinder is used as a drive source, there is an advantage that the operation unit can be configured with a relatively simple structure, but the drive source is not necessarily limited to this. For example, when a servo motor or the like is used as a drive source, a highly reliable heat sealing operation that is less likely to cause a shift in operation timing or the like is realized.

  Here, with reference to FIG. 6 and FIG. 7, the modification of the vertical filling packaging machine shown in FIG. 1 is demonstrated. 6 is a front view schematically showing an overall configuration of a modified example of the vertical filling and packaging machine shown in FIG. 1, and FIG. 7 is a front view showing a horizontal sealing mechanism of the vertical filling and packaging machine in FIG. is there.

  As shown in FIG. 6, the vertical filling and packaging machine 50 ′ of the present modification includes a horizontal seal mechanism 60 disposed below the squeeze roller 11 and a cooling cut mechanism 80 disposed below the horizontal seal mechanism 60. Have. The other configuration of the vertical filling and packaging machine 50 'is the same as that of the vertical filling and packaging machine 50 shown in FIG. The horizontal seal mechanism 60 in this modification has a heater bar and a heater bar receiver, but does not have a cooling bar and a cooling bar receiver, unlike the horizontal seal mechanism 20 shown in FIG. Therefore, the vertical filling and packaging machine 50 ′ of the present modification includes a cooling cut mechanism 80 below the horizontal seal mechanism 60, and thereby heat of the tubular film 1 ′ formed by heat sealing by the horizontal seal mechanism 60. The seal portion is cooled and cut.

  As shown in FIG. 7B, the lateral seal mechanism 60 of this modification has a heater bar 61 and a heater bar receiver 70. The unit on the heater bar receiver 70 side is configured such that the heater bar receiver 70 can move forward and backward with respect to the tubular film 1 ′ (not shown in FIG. 7) using the air cylinder 71 as a drive source.

  Next, the configuration of the unit on the heater bar 61 side will be described. As shown in FIG. 7B, the heater bar 61 according to this modification also has a pressurizing surface 61a formed in a curved surface like the heater bar 21 shown in FIG. The pressing surface 61a may be made of metal, or may be made of heat resistant high hardness rubber. The receiving surface of the heater bar receiver 70 is not a curved surface but a flat surface.

  The heater bar 61 is supported by a shaft member 61b, and is rotatable around a central axis (rotation axis) of the shaft member 61b. The shaft member 61b itself is supported by the support member 62, and the extending direction of the shaft member 61b is the horizontal direction (Y direction) as shown in FIG. 7B. The definition of “Y direction” is as described above.

  A first gear 64 is attached to the shaft member 61b, and the heater bar 61 also rotates according to the rotation of the gear 64. The support member 62 is a member configured to be rotatable around the rotation shaft 62 a and holds a second gear 65 that engages with the first gear 64. The second gear 65 is also engaged with a fixed gear 66 provided on a member 63 provided separately from the support member 62.

  According to such a configuration, as the support member 62 rotates about the rotation shaft 62a, the second gear 65 engaged with the fixed gear 66 rotates. By the rotation of the second gear 65, the first gear 64 engaged with the second gear 65 is rotated by a predetermined angle, and the heater bar 61 is also rotated by the same angle accordingly.

  In this modification, a servo motor 69 is used as a drive source for rotating the support member 62 around the rotation shaft 62a. The servo motor 69 rotationally drives the drive gear 67, and the drive gear 67 is engaged with a drive gear 68 formed at the rear end portion of the support member 62. By rotating the drive gear 67 by the servo motor 69, the support member 62 can be rotated around the rotation shaft 62a. The support member 62 takes the following first and second postures by the rotation of the support member 62 by the servo motor 69. The unit on the heater bar 61 side is configured to be movable back and forth with respect to the tubular film 1 ′ using an air cylinder (not shown) as a drive source.

  The first posture of the support member 26 is the posture shown in FIG. 7A, and when the support member 62 takes this first posture, the heater bar 51 has its upper surface on the pressing surface 61a in contact with the tubular film. It is in such a state.

  The second posture is the posture shown in FIG. 7C, and when the support member 62 takes the second posture, the heater bar 61 is in a state in which the lower side of the pressure surface 61a is in contact with the tubular film. Become.

  The operations of the heat sealing mechanism 60 and the cooling cut mechanism 80 of the present modification configured as described above will be described below with reference to FIGS. 6 and 7.

  In the initial state of the series of operations, both the unit on the heater bar 61 side and the unit on the heater bar receiver 70 side are separated from the tubular film 1 '. In the unit on the heater bar 61 side, the servo motor 69 is rotated in the direction A in FIG. 7B, and the support member 62 is in the first posture (see FIG. 7A).

  From this state, as shown in FIG. 7A, the unit on the heater bar 61 side is brought close to the tubular film 1 '(not shown in FIG. 7), and at the same time, the heater bar receiver 70 is set to the advanced position. As a result, the tubular film 1 ′ is held between the heater bar 61 and the heater bar receiver 70, and the heat sealing operation is started.

  Next, the servo motor 69 is rotated in the direction B in FIG. 7B to move the support member 62 from the first posture to the second posture. The heat sealing operation in this modification is performed from the state of FIG. 7A to the state of FIG. 7C. Note that the movement of the heater bar 61 in this modification is the same as the movement shown in FIG.

  As shown in FIG. 7, the horizontal sealing mechanism 60 in the present modification also presses the tubular film while the heater bar 61 rotates, so that the contents present in the tubular film are squeezed down. Heat sealing will be performed. Therefore, the amount of the content remaining in the heat seal portion is minimized, and the finally obtained heat seal portion is a good one in which biting of the content is suppressed.

  After the heat seal portion is formed by the above steps, the unit on the heater bar 61 side and the heater bar receiver 70 are moved to the retracted position. Then, the squeeze roller 11 is rotated, and the tubular film 1 ′ is sent downward until the heat seal portion is disposed at the position of the cooling cut mechanism 80.

  Subsequently, the heat seal portion is cooled by sandwiching the heat seal portion formed on the tubular film between the cooling bar 81 and the cooling bar receiver 82 of the cooling cut mechanism 80. Thereafter, a cutter (not shown) built in the cooling bar 81 is advanced to cut the center of the horizontal seal portion, whereby the packaged product is cut from the tubular film 1 ′.

It is a front view which shows roughly the whole structure of the vertical filling packaging machine which concerns on this invention. It is a front view which shows the horizontal sealing mechanism of the vertical filling packaging machine of FIG. It is a figure which expands and shows a part of horizontal seal mechanism of FIG. 2, and each state of Fig.3 (a), (b) respond | corresponds to each state of Fig.2 (a), (b). It is a figure for demonstrating the heat seal operation | movement by the horizontal seal mechanism which concerns on this invention, and the cooling operation of a heat seal part. It is a schematic diagram for demonstrating in detail about the heat sealing operation | movement by the horizontal sealing mechanism which concerns on this invention. It is a front view which shows roughly the whole structure of the modification of the vertical filling packaging machine shown in FIG. It is a front view which shows the horizontal sealing mechanism of the vertical filling packaging machine of FIG. It is a front view for demonstrating the structure and operation | movement of the conventional horizontal seal mechanism. It is a figure which shows the area | region of the cylindrical film pinched | interposed with a heater bar and a heater bar receptacle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Film 1 'Cylindrical film 1a Empty filling part 10 Vertical seal mechanism 11 Shigori roller 12 Conveyance roller 14 Bag making guide 15 Injection nozzle 20, 60 Horizontal seal mechanism 21, 61 Heater bar 24 Heater bar receptacle 25a, 62a Rotating shaft 26, 62 Support member 26a Connecting portion 27, 64 First gear 27a, 61b, 65a Shaft member 28, 65 Second gear 29, 66 Fixed gear 30, 63 Member 31, 81 Cooling bar 32 Cam portion 33 Roller 34, 82 Cooling bar receiver 35a Shaft 36 Support member 50 Vertical filling and packaging machine 80 Cooling cut mechanism

Claims (9)

A horizontal seal mechanism comprising a heater bar and a heater bar receiver disposed opposite to each other with a cylindrical film filled with contents, and sealing the cylindrical film by sandwiching the cylindrical film with the heater bar and the heater bar receiver and performing heat sealing In
The heater bar has a curved pressure surface that is convex toward the tubular film side, is orthogonal to the feeding direction of the tubular film, and the heater bar moves toward the tubular film. A transverse seal mechanism configured to rotate around a rotation axis extending in a direction orthogonal to the axis.   In the heater bar, one end side of the pressurizing surface first contacts the tubular film, then the central portion of the pressurizing surface contacts the tubular film, and then the other end side of the pressurizing surface contacts the tubular film. The transverse seal mechanism according to claim 1, wherein the transverse seal mechanism is configured to contact.   The horizontal seal mechanism according to claim 1, wherein the heater bar receiver has a flat receiving surface at a position facing the pressing surface. While holding the shaft member which comprises the said rotating shaft, the 2nd gear engaged with the 1st gear attached to this shaft member is hold | maintained, Around the other rotating shaft provided separately from the said rotating shaft A support member that pivots to
A member formed with a fixed gear engaging with the second gear;
Drive means for moving the support member around the other rotation axis;
As the support member moves around the other rotation axis, the second gear and the fixed gear engage with each other, and the first gear rotates by the rotation of the second gear. The horizontal seal mechanism according to any one of claims 1 to 3, wherein the heater bar rotates around the rotation axis.   The horizontal sealing mechanism according to claim 4, wherein the driving means is an air cylinder.   The horizontal sealing mechanism according to claim 4, wherein the driving means is a servo motor.   In order to cool the heat seal portion formed on the tubular film by the heater bar, the cooling bar further moved to a position facing the receiving surface of the heater bar receiver after the heat sealing is completed, The cooling bar is arranged on the same side as the heater bar with respect to the tubular film, and is configured to move toward the tubular film side in conjunction with the heater bar moving away from the tubular film. The horizontal sealing mechanism according to claim 1, wherein A lateral seal mechanism according to any one of claims 1 to 7,
Conveying means for conveying the tubular film vertically downward;
A pair of rolls disposed above the lateral seal mechanism and rotating while sandwiching the tubular film into which the contents have been placed so as to feed the tubular film downward to form an empty filling portion in the tubular film With Shigoki Rolla,
A vertical filling and packaging machine. A lateral seal mechanism according to any one of claims 1 to 6,
Conveying means for conveying the tubular film vertically downward;
A pair of rolls disposed above the lateral seal mechanism and rotating while sandwiching the tubular film into which the contents have been placed so as to feed the tubular film downward to form an empty filling portion in the tubular film With Shigoki Rolla,
A cooling bar and a cooling bar receiver, which are opposed to each other below the lateral sealing mechanism and sandwich the heat sealing portion formed on the tubular film by the heater bar so as to cool the heat sealing portion. When,
A vertical filling and packaging machine.

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