JP5684596B2 - Packaging machine - Google Patents

Description

  The present invention relates to a packaging machine, and more particularly, to a packaging machine in which a packaging material to be conveyed is formed into a cylindrical shape and then laterally sealed after a packaged material is filled therein.

  2. Description of the Related Art Conventionally, a vertical bag making and packaging machine has been widely used as an apparatus for filling a bag with food and other objects to be packaged while manufacturing the bag.

  For example, in a vertical pillow bag making and packaging machine disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-142806), a sheet-like packaging material is formed into a cylindrical shape by a former and a tube. The stacked vertical edges of the cylindrical packaging material are vertically sealed by the vertical sealing means. After that, the cylindrical packaging material is filled with an article to be packaged, and is sealed horizontally across the upper part of the bag and the lower part of the succeeding bag by the horizontal sealing mechanism. The center of the laterally sealed portion that is laterally sealed is cut with a cutter. In the pillow bag making and packaging machine, as described above, the operation of manufacturing the bag and filling the bag into the package is continuously performed.

  In the lateral sealing mechanism of the bag making and packaging machine as described above, a mechanism is employed in which a pair of heat pressing members called seal jaws facing each other with the cylindrical packaging material interposed therebetween are pressed against each other to heat and press the cylindrical packaging material. ing.

  Furthermore, in recent years, in order to form a self-supporting bag, in the bag making and packaging machine disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2010-83563), one of the opposing surfaces of the pair of sealing jaws is A seal jaw of a type protruding in the shape of [<] and recessed on the other surface is used, and the lateral seal portion on the bag bottom side naturally falls forward or backward of the bag.

  However, in the bag making and packaging machine disclosed in Patent Document 2, not only the lateral seal portion on the bag bottom side but also the lateral seal portion on the bag upper side collapses, and the aesthetics of the completed bag are impaired.

  An object of the present invention is to provide a packaging machine in which only the lateral seal portion on the bag bottom side is tilted in one direction.

  A packaging machine according to a first aspect of the present invention is a packaging machine that horizontally seals a packaging material by sandwiching a packaging material along a direction intersecting the conveying direction by a pair of sealing jaws, and the packaging material of the pair of sealing jaws On the sandwiched surface, serrations are provided from the upper end to the lower end. The tip angle of the tooth at the upper end of the serration is smaller than the tip angle of the tooth adjacent below it, and is acute.

  In this packaging machine, since the root of the bag bottom side lateral seal portion is bent with sharp teeth, the tilt angle of the root increases and the entire bag bottom side lateral seal portion is easily bent in a certain direction.

  The packaging machine which concerns on the 2nd viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint, Comprising: One of a pair of seal jaws is a 1st seal jaw, and the other is a 2nd seal jaw. The first sealing jaw has a first surface on which a first serration is provided. The second seal jaw has a second surface on which a second serration is provided. The first serration and the second serration mesh with each other with the packaging material interposed therebetween. In addition, the tip angle of the upper end tooth of the first serration is smaller than the tip angle of the adjacent tooth below and is an acute angle. Furthermore, the opening angle of the tooth groove of the second serration that meshes with the upper end tooth of the first serration is smaller than the opening angle of the other tooth spaces, and is an acute angle.

  In this packaging machine, as in the packaging machine according to the first aspect, the angle of collapse of the root is increased, and the entire bag bottom side lateral seal portion is easily bent in a certain direction.

  The packaging machine which concerns on the 3rd viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: The tip angle of the tooth | gear of an upper end is 50 degrees-70 degrees.

  In this packaging machine, the inclination angle of the root of the bag bottom side lateral seal portion can be secured while securing the strength of the tooth tip.

  The packaging machine which concerns on the 4th viewpoint of this invention is a packaging machine which concerns on a 2nd viewpoint, Comprising: The protrusion part which protrudes rather than the tooth tip of a 2nd serration is provided above the upper end of a 2nd serration.

  In this packaging machine, at the time of lateral sealing, the protruding portion pushes the root of the bag bottom side lateral seal portion in a certain direction, so that the bag bottom side lateral seal portion is more likely to fall down.

  The packaging machine which concerns on the 5th viewpoint of this invention is a packaging machine which concerns on a 4th viewpoint, Comprising: The temperature of a protrusion part is set lower than the temperature of a 2nd seal jaw.

  In this packaging machine, the projecting portion also contacts a portion other than the lateral seal portion at the bag bottom portion of the packaging material. Therefore, a temperature as high as that of the sealing jaw may cause the packaging material to thermally deform more than necessary. Here, since the temperature of the protruding portion is prevented from rising to a temperature as high as that of the seal jaw, the portion other than the lateral seal portion at the bag bottom portion of the packaging material is protected from the high temperature.

  The packaging machine which concerns on the 6th viewpoint of this invention is a packaging machine which concerns on a 5th viewpoint, Comprising: A protrusion part is shape | molded with the material whose heat conductivity is lower than a 2nd sealing jaw.

  In this packaging machine, the protrusion is formed of a material having a lower thermal conductivity than the seal jaw, thereby preventing the temperature of the protrusion from rising to a temperature as high as that of the seal jaw.

  The packaging machine which concerns on the 7th viewpoint of this invention is a packaging machine which concerns on a 5th viewpoint or a 6th viewpoint, Comprising: A heat insulating material intervenes between a protrusion part and a 2nd seal jaw.

  In this packaging machine, since the heat insulating material is interposed between the protrusion and the seal jaw, the temperature of the protrusion is prevented from rising to a temperature as high as that of the seal jaw.

  The packaging machine which concerns on the 8th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint, Comprising: The control part which controls operation | movement of a seal jaw is provided. When the sealing jaw abuts against the packaging material and performs lateral sealing, the control unit makes the speed of the sealing jaw along the packaging material conveyance direction slower than the packaging material conveyance speed.

  In this packaging machine, the speed of the sealing jaw along the packaging material conveyance direction is slower than the packaging material conveyance speed, so that the upper part of the side of the packaging material that is sealed laterally approaches the sealing jaw and is heated and welded. It changes to an easy state. At the stage where the packaging material is sequentially discharged as a bag, the surface that has been changed to a state in which it is easy to weld and the one side of the laterally sealed portion are in close contact with each other to form a planar region. As a result, the bag stands in its planar area.

  In the packaging machine according to the present invention, since the root of the bag bottom side lateral seal portion is bent with acute teeth, the tilt angle of the root increases, and the entire bag bottom side horizontal seal portion is easily bent in a certain direction.

The perspective view of the packaging machine which concerns on 1st Embodiment of this invention. The perspective view which shows schematic structure of the bag making packaging unit of a packaging machine. The side view of a horizontal seal mechanism. The external appearance perspective view of a horizontal direction drive mechanism. The top view around seal jaw. The side view around seal jaw. The enlarged side view of the serration of a seal jaw. The expansion side view of the serration of the seal jaw used for the packaging machine which concerns on 2nd Embodiment of this invention. The side view of the locus | trajectory of a seal jaw. The side view of a cylindrical film when a sealing jaw descend | falls at the speed of Vjaw = Vfm with a cylindrical film pinched | interposed. The side view of a cylindrical film when a sealing jaw descend | falls at the speed of Vjaw <Vfm, pinching | interposing a cylindrical film. The perspective view which shows schematic structure of the bag making packaging unit of the packaging machine of the system which sends a film with a gap. The perspective view of a guide mechanism. The side view of a clam plate and a seal jaw just before a clam plate operate | moves. The side view of a clam plate and a seal jaw when a clam plate pinches | interposes a cylindrical film and the seal jaw has stopped. The side view of a crumb plate and a sealing jaw when a crumb plate pinches | interposes a cylindrical film and the sealing jaw is performing the horizontal sealing process.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<First Embodiment>
(1) Configuration of Packaging Machine 1 FIG. 1 is a perspective view of a packaging machine according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit of the packaging machine. 1 and 2, the packaging machine 1 includes a combination weighing machine 2, a bag making and packaging unit 5, and a film supply unit 6.

  The combination weighing machine 2 discharges the product C so as to be light and have a predetermined total weight. The bag making and packaging unit 5 is a main body portion that packs a packaged item. The film supply unit 6 supplies the film F that becomes a bag to the bag making and packaging unit 5.

  Further, operation switches 7 are disposed on the front surface of the bag making and packaging unit 5. At a position where an operator who operates the operation switches 7 can visually recognize, a touch panel display 8 indicating an operation state is arranged.

  The combination weighing machine 2, the film supply unit 6 and the bag making and packaging unit 5 are controlled in accordance with operations and settings input from the operation switches 7 and the touch panel display 8. To do. The operation switches 7 and the touch panel display 8 are connected to a control unit (not shown) composed of a CPU, a ROM, a RAM, and the like, and the control unit controls the combination weighing machine 2 and the bag making and packaging unit 5. Necessary information is fetched from various sensors installed in and used in various controls.

(2) Detailed configuration (2-1) Combination weighing machine 2
The combination weighing machine 2 is arranged at the upper part of the bag making and packaging unit 5, and after weighing the product C with a weighing hopper, these weighing values are combined so as to have a predetermined total weight and sequentially discharged.

(2-2) Film supply unit 6
The film supply unit 6 is a unit that supplies a sheet-like film F to the forming mechanism 13 of the bag making and packaging unit 5, and is provided adjacent to the bag making and packaging unit 5. A roll around which the film F is wound is set in the film supply unit 6, and the film F is fed out from this roll.

(2-3) Bag making and packaging unit 5
As shown in FIGS. 1 and 2, the bag making and packaging unit 5 includes a forming mechanism 13, a pull-down belt mechanism 14, a vertical sealing mechanism 15, a horizontal sealing mechanism 17, a gusset mechanism 18, and a support frame 12. It is configured. The forming mechanism 13 forms the film F sent in a sheet shape into a cylindrical shape. The pull-down belt mechanism 14 conveys a tubular film F (hereinafter referred to as a tubular film Fm) downward. The vertical sealing mechanism 15 seals the overlapping portion of the tubular film Fm in the vertical direction. The horizontal sealing mechanism 17 seals the upper and lower ends of the bag by sealing the tubular film Fm in the horizontal direction. The gusset mechanism 18 forms a gusset on the side surface portion of the tubular film Fm. The support frame 12 supports these mechanisms. A casing 9 is attached around the support frame 12.

(2-3-1) Molding mechanism 13
The forming mechanism 13 includes a tube 13b and a former 13a. The tube 13b is a cylindrical member, and the upper and lower ends are open. The product C measured by the combination weighing machine 2 is put into the opening at the upper end of the tube 13b. The former 13a is disposed so as to surround the tube 13b. The sheet-like film F fed out from the film roll is formed into a cylindrical shape when passing between the former 13a and the tube 13b. The tube 13b and the former 13a of the forming mechanism 13 can be replaced according to the size of the bag to be manufactured.

(2-3-2) Pull-down belt mechanism 14
As shown in FIG. 2, the pull-down belt mechanism 14 is a mechanism that sucks and continuously conveys the tubular film Fm wound around the tube 13b, and belts 14c are provided on both the left and right sides of the tube 13b. ing. In the pull-down belt mechanism 14, the belt 14c having an adsorption function is rotated by the driving roller 14a and the driven roller 14b to carry the tubular film Fm downward. In FIG. 2, a roller drive motor that rotates the drive roller 14a and the like is not shown.

(2-3-3) Vertical seal mechanism 15
The vertical sealing mechanism 15 is a mechanism that heats and vertically seals an overlapping portion of the rectangular tubular film Fm wound around the tube 13b while pressing the overlapping portion against the tube 13b with a constant pressure. The vertical sealing mechanism 15 is located on the front side of the tube 13b, and has a heater and a heater belt that is heated by the heater and contacts an overlapping portion of the tubular film Fm. The vertical seal mechanism 15 also includes a drive device (not shown) for moving the heater belt closer to or away from the tube 13b.

(2-3-4) Gusset forming mechanism 18
As shown in FIG. 2, the gusset forming mechanism 18 is disposed between the pull-down belt mechanism 14 and the lateral seal mechanism 17, and a pair of folding members 18a disposed on the left and right so as to sandwich the tubular film Fm, A gusset is formed in the side part of the cylindrical film Fm using 18b.

(2-3-5) Horizontal seal mechanism 17
FIG. 3 is a side view of the lateral seal mechanism. In FIG. 3, the horizontal sealing mechanism 17 has a first sealing mechanism 50a and a second sealing mechanism 50b. The one located on the left side of the tubular film Fm in FIG. 3 is the first seal mechanism 50a, and the one located on the right side is the second seal mechanism 50b.

  Each of the first seal mechanism 50a and the second seal mechanism 50b sandwiches the tubular film Fm while rotating the seal jaws 51 and 52 in a D shape (see, for example, the locus of the seal jaw indicated by the dotted line in FIG. 9). .

  The seal jaws 51 and 52 have a heater inside. The sealing surfaces of the sealing jaws 51 and 52 are heated by this heater, and a part of the tubular film Fm sandwiched between the sealing jaws 51 and 52 is sealed.

  Here, for convenience of explanation, the first sealing mechanism 50a side of the sealing jaw 51 is referred to as a first sealing jaw 51a, and the second sealing mechanism 50b side is referred to as a second sealing jaw 51b. The first sealing jaw 51a and the second sealing jaw 51b are pressed against each other and sealed with the tubular film Fm interposed therebetween.

  Similarly, in the sealing jaw 52, the first sealing mechanism 50a side is called a first sealing jaw 52a, and the second sealing mechanism 50b side is called a second sealing jaw 52b. The first sealing jaw 52a and the second sealing jaw 52b are pressed against each other and sealed with the tubular film Fm interposed therebetween.

  In addition, when mentioning matters common to all the sealing jaws, they are expressed as sealing jaws 51 and 52.

  The seal jaws 51 and 52 are rotated around the axes C1 and C2 by a drive motor (not shown). That is, the first seal jaws 51a and 52a rotate around the axis C1, and the second seal jaws 51b and 52b rotate around the axis C2.

(3) Detailed Configuration of Lateral Seal Mechanism 17 (3-1) Lateral Drive of Seal Jaws 51 and 52 FIG. 4 is an external perspective view of the lateral drive mechanism of the seal jaw. 3 and 4, the first seal mechanism 50a is supported by the first horizontal movement plate 61a, and the second seal mechanism 50b is supported by the second horizontal movement plate 61b. The first horizontal moving plate 61a and the second horizontal moving plate 61b are horizontally moved by a lateral drive mechanism 55 shown in FIG.

  As shown in FIG. 4, the lateral drive mechanism 55 has a drive mechanism 65 for causing the first horizontal movement plate 61 a and the second horizontal movement plate 61 b to approach or separate from each other.

  The drive mechanism 65 includes a ball screw 80a, a first nut 81, a second nut 82, a first connecting rod 83, a second connecting rod 84, a third connecting rod 85, and a fourth connecting rod 86.

  The ball screw 80a is rotated by a servo motor 80 (see FIG. 3). The first nut 81 and the second nut 82 are screwed into the ball screw 80a. The first connecting rod 83 and the second connecting rod 84 are provided so as to be orthogonal to the ball screw 80a in the horizontal direction. The pair of third connecting rods 85 is provided along the moving direction of the first horizontal moving plate 61a and the second horizontal moving plate 61b. The fourth connecting rod 86 is provided in parallel with the third connecting rod 85.

  The first connecting rod 83 is connected to the third connecting rod 85 via a joint 87, and the tip of the third connecting rod 85 is fixed to the side end face of the second horizontal moving plate 61b. In addition, the 3rd connection rod 85 has penetrated the 1st horizontal displacement board 61a slidably.

  The second connecting rod 84 is connected to the fourth connecting rod 86 via a joint 88, and the tip of the fourth connecting rod 86 is fixed to the side end surface of the horizontal moving plate 61a.

  Further, in the ball screw 80a, a portion where the first nut 81 is screwed and a portion where the second nut 82 is screwed are mutually reverse screws.

  When the ball screw 80a is rotated by the drive mechanism 65, the first horizontal moving plate 61a and the second horizontal moving plate 61b can be brought close to or separated from each other.

(3-2) Configuration of Seal Jaws 51 and 52 FIG. 5 is a plan view of the periphery of the seal jaws. FIG. 6 is a side view around the seal jaw. Since the sealing jaw 51 and the sealing jaw 52 have the same configuration, only the sealing jaw 51 is shown in FIGS. 5 and 6, a heater 71 and a cutting mechanism 72 are incorporated in the seal jaw 51.

  Further, serrations that mesh with each other are formed on the surfaces of the first and second sealing jaws 51a and 51b of the sealing jaw 51 that face each other. Of these serrations, the first seal jaw 51a side is called the first serration 511, and the second seal jaw 51b side is called the second serration 512.

(3-2-1) Heater 71
Two heaters 71 are inserted into the inside along the longitudinal direction of each of the first seal jaw 51a and the second seal jaw 51b. The heater 71 generates heat upon receiving electric power supplied from the electric wiring 76a, and heats the first sealing jaw 51a and the second sealing jaw 51b to a sealing temperature corresponding to the cylindrical film Fm.

(3-2-2) Cutting mechanism 72
The cutting mechanism 72 is provided on the first sealing jaw 51a on the first sealing mechanism 50a side, and includes a cutter 72a and a cutter driving mechanism 72b. The cutter 72a is advanced from the slide space 53 formed in the first seal jaw 51a toward the second seal jaw 51b by the cutter driving mechanism 72b in accordance with the timing of sealing the cylindrical film Fm.

  An air cylinder is employed for the cutter driving mechanism 72b in order to reciprocate the cutter 72a in a predetermined direction. Therefore, the cutter 72a is pressed between the first seal jaw 51a and the second seal jaw 51b, or between the first seal jaw 52a and the second seal jaw 52b, at substantially the center position in the width direction of the seal portion, The sealed part is cut. As a result, the bags are divided one by one and discharged to the chute conveyor 19 (see FIG. 1).

(3-2-3) Serration FIG. 7 is an enlarged side view of the upper ends of the first serration and the second serration of FIG. In FIG. 7, the tip angle A <b> 1 of the upper end tooth 511 a of the first serration 511 is smaller than the tip angle of the adjacent tooth below and is an acute angle of 50 ° to 70 °.

  For example, when the tip angle A1 of the upper end tooth 511a of the first serration 511 is the same size as the tip angle of the adjacent tooth below the first serration 511, the seal portion after the horizontal sealing process of the tubular film Fm is almost inclined. No.

  However, when the tip angle A1 of the upper end tooth 511a of the first serration 511 is smaller than the tip angle of the adjacent tooth below and is an acute angle of 50 ° to 70 °, the seal portion on the bag bottom side is included. The vicinity of the root is bent with sharp teeth. Therefore, when the first seal jaw 51a and the second seal jaw 51b are separated from each other, the tilt angle near the base of the lateral seal portion on the bag bottom side increases, and the seal portion is bent in one direction.

  It should be noted that the opening angle A2 of the tooth groove 512a of the second serration 512 that meshes with the upper tooth 511a of the first serration 511 is smaller than the opening angle of the other tooth grooves, and is an acute angle corresponding to the tooth 511a. Compared with the case where it is not, the degree of bending of the seal portion increases.

(4) Features of the first embodiment (4-1)
The packaging machine 1 horizontally seals the tubular film Fm between the first sealing jaw 51a and the second sealing jaw 51b along the direction intersecting the transport direction. A first serration 511 is provided from the upper end to the lower end on the surface of the first seal jaw 51a sandwiching the tubular film Fm. Similarly, a second serration 512 is provided from the upper end to the lower end on the surface of the second seal jaw 51b sandwiching the tubular film Fm. The tip angle of the tooth 511a at the upper end of the first serration 511 is smaller than the tip angle of the tooth adjacent to the lower side and is an acute angle. As a result, the base of the lateral seal portion on the bag bottom side is bent with sharp teeth, the tilt angle of the base increases, and the independence of the bag is stabilized.

(4-2)
The tip angle of the teeth 511a at the upper end of the first serration 511 is within a range of 50 ° to 70 ° so as to ensure the tilt angle of the base of the lateral seal portion on the bag bottom side while ensuring the strength of the tooth tip. Is set.

Second Embodiment
Here, a second embodiment having a configuration for further stabilizing the independence of the bag will be described. In addition, since 2nd Embodiment is based on the structure of 1st Embodiment, it attaches | subjects the same code | symbol and name to the same member, and abbreviate | omits description.

(1) Configuration FIG. 8 is an enlarged side view of the serration of the seal jaw used in the packaging machine according to the second embodiment of the present invention. In FIG. 8, the protruding portion 56 is disposed so as to contact the upper end surface side of the second serration 512. The tip of the protrusion 56 protrudes beyond the tooth tip of the second serration 512.

  A space is secured on the upper end surface side of the first serration 511 facing the protruding portion 56. Therefore, while the first serration 511 and the second serration 512 are engaged with each other with the tubular film Fm interposed therebetween, the protruding portion 56 pushes the base on the bag bottom side toward the first seal jaw 51a.

  When the 1st serration 511 and the 2nd serration 512 leave | separate from the state, the protrusion part 56 leaves | separates from the root | base on the bag bottom part side delaying by the part which protrudes from the tooth tip of the 2nd serration 512. This is because when the first serration 511 and the second serration 512 are separated from each other, the projecting portion 56 functions to push the root on the bag bottom side toward the first serration 511 side, so that the seal portion is the first from the root on the bag bottom side. It falls to the serration 511 side.

  The protrusion 56 is formed of a material having a lower thermal conductivity than the second seal jaw 51b so that the heat of the second seal jaw 51b is not easily transmitted to the bag bottom via the protrusion 56. This is because the protrusion 56 also contacts the bottom of the bag, and the high temperature of the sealing jaws 51 and 52 may cause the bag bottom to be thermally deformed more than necessary.

  Therefore, the temperature of the protrusion 56 needs to be set lower than the temperature of the second seal jaw 51b. At least the protrusion 56 is formed of a material having a lower thermal conductivity than the second seal jaw 51b, whereby the temperature of the protrusion 56 is prevented from rising to a temperature as high as the second seal jaw 51b. The bottom is protected from high temperatures.

(2) Modification In the second embodiment, the protrusion 56 is formed of a material having a lower thermal conductivity than the second seal jaw 51b so that the temperature of the protrusion 56 is lower than the temperature of the second seal jaw 51b. However, as a modification, a heat insulating material may be interposed between the protruding portion 56 and the second seal jaw 51b. That is, by interposing a heat insulating material between the protrusion 56 and the second seal jaw 51b, the temperature of the protrusion 56 is prevented from rising to a temperature as high as the second seal jaw 51b.

  In the above modification, the protrusion 56 does not need to be formed of a material having a lower thermal conductivity than the second seal jaw 51b.

<Third Embodiment>
In 1st Embodiment and 2nd Embodiment, only the structure of the sealing jaw demonstrated as a means to stabilize the self-supporting property of the bag after bag making. Here, a third embodiment in which the self-supporting property of the bag after bag making is further stabilized by speed control of the sealing jaw will be described.

  In addition, since the packaging machine which concerns on 3rd Embodiment is based on the structure of the packaging machine which concerns on 1st Embodiment or 2nd Embodiment, it attaches | subjects the same code | symbol and name to the same member, and abbreviate | omits description. .

  FIG. 9 is a side view of the locus of the sealing jaw. In FIG. 9, as mentioned in the description of the first embodiment, the first sealing jaw 51a and the second sealing jaw 51b sandwich the tubular film F while turning in a D shape.

  Usually, the speed at which the first seal jaw 51a and the second seal jaw 51b descend while sandwiching the tubular film Fm (hereinafter referred to as seal jaw descending speed Vjaw), and the feed speed of the tubular film Fm (hereinafter referred to as film feed). The speed Vfm is controlled to match.

  However, in the third embodiment, the seal jaw lowering speed Vjaw is set to be slower than the film feed speed Vfm (that is, Vjaw <Vfm).

  FIG. 10A is a side view of the tubular film when the sealing jaw descends at a speed of Vjaw = Vfm while sandwiching the tubular film. FIG. 10B is a side view of the tubular film when the sealing jaw descends at a speed of Vjaw <Vfm while sandwiching the tubular film.

  As can be seen by comparing FIG. 10A and FIG. 10B, the width of the bag bottom becomes larger than the width of the bag bottom when Vjaw = Vfm when Vjaw <Vfm. This is because the seal jaw lowering speed Vjaw in the transverse seal section becomes slower than the film feed speed Vfm, and therefore the upper part of the tubular film Fm subjected to the transverse seal process, that is, the bag bottom part is loosened.

  When the bag bottom part is loosened, the bag bottom part approaches the first seal jaw 51a and the second seal jaw 51b and is heated to form a bag bottom part having a wide shape. Further, the bottom of the bag is changed to a state in which it is easily welded by approaching and heating the first seal jaw 51a and the second seal jaw 51b, and the cylindrical film Fm is gradually discharged as a bag. The surface that has been changed to a state where it can be easily welded and the one surface of the portion subjected to the transverse sealing process are in close contact with each other, thereby forming a planar region.

  As a result, when the bags are arranged on the display shelf, the flat area makes the bags stand up stably, so that the bags are more effective in attracting consumers than bags that cannot stand up.

<Other embodiments>
Here, by combining the serrations of the seal jaws used in the packaging machine according to the first embodiment or the second embodiment, it is possible to make up for the related technology that has a more excellent effect or the disadvantages of the serrations of the seal jaws. Related technologies will be described. The serration shape of the seal jaw is the same as that of the first embodiment or the second embodiment, and thus description thereof is omitted.

(A) Packaging machine having a guide mechanism for forming a square bottom (A-1) Configuration FIG. 11 is a perspective view showing a schematic configuration of a bag making and packaging unit in a packaging machine in which a film is fed with a gap. FIG. 11 is the same as the first embodiment except for the parts different from FIG. Therefore, the same reference numerals and names are assigned to the same members as those in the first embodiment, and description thereof is omitted. Here, only differences from the first embodiment will be described.

  The sheet-like film F sent from the film supply unit 6 (see FIG. 1) is wound around the tube 13b from the former 13a and formed into a cylindrical shape, and is conveyed downward by the pull-down belt mechanism 14 as it is. When the film F is wound around the tube 13 b, the left and right ends are overlapped on the peripheral surface, and the overlapped portion is vertically sealed by the vertical seal mechanism 15. The cylindrical film Fm sealed vertically passes through the tube 13b and descends to the horizontal sealing mechanism 17. At this time, the article C falls from the combination weighing machine 2 through the tube 13b into the cylindrical film Fm.

  In the state in which the article C is present in the tubular film Fm, the pair of sealing jaws 51 laterally seal the tubular film Fm. Simultaneously with the horizontal sealing operation, the preceding bag and the subsequent bag (tubular film Fm) are separated by the cutter built in the sealing jaw 51.

  When the pair of sealing jaws 51 laterally seals the tubular film Fm and forms a square bottom after the lateral sealing process, the guide mechanism 54 intersects the transport direction of the tubular film Fm from the inside of the tubular film Fm. The tubular film Fm is pushed and spread in the direction. Hereinafter, a specific configuration and operation of the guide mechanism will be described.

  FIG. 12 is a perspective view of the guide mechanism. In FIG. 12, the guide mechanism 54 includes a spreader 41, a hinge mechanism 42, a pressing portion 43, an L-shaped member 46, a leaf spring 47, and an annular belt 48.

  The spreader 41 is attached to the lower end of the tube 13 b and can be rotated by a hinge mechanism 42. The pressing part 43 operates an internal transmission mechanism (not shown) by being pressed by the pressing mechanism 45 (see FIG. 11), and rotates the lower end of the spreader 41 to the front side or the rear side. Thereby, the lower end of the cylindrical film Fm is spread from the inside toward the outside.

  When the pressing mechanism 45 does not apply force to the pressing portion 43, the lower end of the spreader 41 is in a state of facing straight downward due to its own weight. On the other hand, when the pressing mechanism 45 applies a force to the pressing portion 43, the lower end of the spreader 41 is in an open state.

  The L-shaped member 46 extends in the conveyance direction of the tubular film Fm, and the tip end portion extends toward both ends of the spreader 41 in the width direction. When the second push-bending mechanism 58 (see FIG. 11) operates in the upward direction, the tip of the L-shaped member 46 and the second push-bending mechanism 58 sandwich the side portion at the bottom of the bag.

  When the pressing mechanism 45 presses the pressing portion 43, the lower end of the tubular film Fm is expanded from the inside in the depth direction (arrow D2). Thereafter, the first push-bending mechanism 57 (see FIG. 11) moves in the direction of the arrow D3 to push and bend the seal portion, and the second push-bending mechanism 58 pushes and bends the side portion at the bottom of the bag.

  The leaf spring 47 spreads the tubular film Fm in the direction (E2 direction) perpendicular to the opening direction (F1 direction) of the lower end of the spreader 41 so that the tubular film Fm is not wrinkled during the transverse sealing process. .

  The annular belt 48 is arranged so that the upper part of the spreader 41 is bundled. During the horizontal sealing process, the pressing mechanism 45 does not apply force to the pressing portion 43, the lower end of the spreader 41 is in a state of facing straight downward due to its own weight, and the upper portion of the spreader 41 is not restrained by the annular belt 48.

  However, when the square bottom is formed after the horizontal sealing process, the pressing mechanism 45 applies a force to the pressing portion 43 so that the lower end of the spreader 41 is opened, and the upper portion of the spreader 41 is restrained by the annular belt 48. As a result, the lower end of the spreader 41 is spread evenly without opening too much.

  When the lower end of the spreader 41 is opened, the annular belt 48 becomes an ellipse that is long in the F1 direction due to the upper part of the spreader 41, so that the leaf spring 47 is closed in the E1 direction by the annular belt 48.

  As described above, the guide mechanism 54 spreads the tubular film Fm in the E2 direction by the leaf spring 47 during the lateral sealing process, and closes the leaf spring 47 in the E1 direction and spreads the spreader 41 in the F1 direction when forming the square bottom.

(A-2) Effect In the process of forming the square-bottom self-supporting bag, the first push-bending mechanism 57 (see FIG. 11) moves in the direction of the arrow D3 and pushes and bends the horizontal seal portion. As is done, it is preferred that the transverse seal is pre-tilted in the pushing and bending direction.

  In this packaging machine, the state where the lateral seal part on the bag bottom side is inclined in advance in the pushing and bending direction by applying the serration of the seal jaw used in the packaging machine according to the first embodiment or the second embodiment. Is formed.

(B) Packaging machine having a clam plate mechanism for preventing biting of an object to be packaged at the time of lateral sealing (B-1) Configuration FIG. 13A is a side view of a clam plate and a seal jaw immediately before the clam plate operates. FIG. 13B is a side view of the clam plate and the seal jaw when the clam plate sandwiches the tubular film and the seal jaw is stopped. FIG. 13C is a side view of the crumb plate and the sealing jaw when the crumb plate sandwiches the tubular film and the sealing jaw is performing the lateral sealing process.

  13A to 13C, the clam plate mechanism 91 is configured to prevent a packaged item or the like falling from above from being sealed by sandwiching the upper part of the planned sealing area immediately before the sealing jaw 51 laterally seals the tubular film Fm. To prevent biting.

  The clam plate mechanism 91 is disposed above the seal jaw 51, and includes a pair of clam plates 611 and 612 that directly sandwich the tubular film Fm, and drive units 91a and 91b that reciprocate the pair of clam plates. Contains. For convenience of explanation, one of the pair of crumb plates is called a first crumb plate 911 and the other is called a second crumb plate 912.

  In FIG. 13A, the first clam plate 911 protrudes toward the tubular film Fm side from the first seal jaw 51a. Similarly, the second clam plate 912 also protrudes toward the tubular film Fm side from the second seal jaw 51b.

  Therefore, after the first clam plate 911 and the second clam plate 912 sandwich the tubular film Fm, the first seal jaw 51a and the second seal jaw 51b sandwich the tubular film Fm and seal after a certain time delay. To do. For convenience of explanation, the time from when the first clam plate 911 and the second clam plate 912 sandwich the tubular film Fm until the first seal jaw 51a and the second seal jaw 51b sandwich the tubular film Fm. This is called the seal waiting time.

  While the seal waiting time has elapsed, inside the tubular film Fm, there is a covering between the first clam plate 911 and the second clam plate 912 and between the first seal jaw 51a and the second seal jaw 51b. The package can fall without being sandwiched between the first seal jaw 51a and the second seal jaw 51b. As a result, an article to be packaged is prevented from being caught in the seal portion during the horizontal sealing process.

  The first crumb plate 911 and the second crumb plate 912 can project to a maximum of 30 mm. Conventionally, the projection dimension of 20 mm to 30 mm is the mainstream. However, the larger the projecting dimension is, the larger the reciprocating distance of the seal jaw 51 is, which causes an increase in the size of the lateral seal mechanism 117.

  In order to suppress an increase in the size of the lateral seal mechanism 117, it is preferable that the projecting dimensions of the first clam plate 911 and the second clam plate 912 are set to 5 to 10 mm. In this case, however, the seal waiting time is shortened. There is a possibility that an object to be packaged inside the tubular film Fm is sandwiched between the first seal jaw 51a and the second seal jaw 51b, and the object to be packaged is caught in the seal portion.

  Therefore, in order to lengthen the seal standby time, the control of stopping the operation of the first seal jaw 51a and the second seal jaw 51b or reducing the operation speed is executed. As a result, the shortened waiting time can be compensated by the stop time or the delay time due to deceleration. Therefore, the projecting dimension of the first clam plate 911 and the second clam plate 912 can be set to 5 to 10 mm, and the enlargement of the lateral seal mechanism 117 is suppressed.

(B-2) Effect For example, when the first sealing jaw 51a and the second sealing jaw 51b are sandwiched between the tubular film Fm with the powder of a packaged article such as candy attached, the upper end of the first serration 511 Since the tip angle of the tooth 511a is formed as an acute angle, there is a possibility that the seal portion may be damaged by the tip of the tooth 511a and the powder of the package.

  However, since the control of stopping the operation of the first seal jaw 51a and the second seal jaw 51b or reducing the operation speed is executed, the time for the powder of the packaged item to fall downward is secured. A situation in which the first seal jaw 51a and the second seal jaw 51b are sandwiched with the powder of an article to be packaged such as candy attached to the tubular film Fm is avoided.

  According to the present invention, among the seal parts subjected to the lateral seal process, a bag whose seal part on the bag bottom side is inclined in one direction can be manufactured. It is also useful for feeding type packaging machines.

DESCRIPTION OF SYMBOLS 1 Packaging machine 51 Sealing jaw 51a 1st sealing jaw 51b 2nd sealing jaw 511 1st serration 512 2nd serration 511a The tooth | gear 56 of the 2nd serration which meshes with the tooth | gear of the upper end of the 1st serration Protrusion

JP 2004-142806 A JP 2010-083563 A

Claims (8)

A packaging machine for horizontally sealing a pair of sealing jaws along a direction intersecting the conveying direction with a pair of sealing jaws,
Serrations are provided from the upper end to the lower end on the surface of the pair of sealing jaws that sandwich the packaging material,
The tip angle of the tooth at the upper end of the serration is smaller than the tip angle of the tooth adjacent to the lower side and is acute.
Packaging machine. One of the pair of sealing jaws is a first sealing jaw, the other is a second sealing jaw,
The first seal jaw has a first surface provided with a first serration;
The second sealing jaw has a second surface provided with a second serration;
The first serration and the second serration mesh with each other with the packaging material in between,
The tip angle of the tooth at the upper end of the first serration is smaller than the tip angle of the adjacent tooth below the first serration and is an acute angle,
The opening angle of the tooth groove of the second serration that meshes with the teeth at the upper end of the first serration is smaller than the opening angle of the other tooth spaces and is an acute angle.
The packaging machine according to claim 1. The tip angle of the upper end tooth is 50 ° to 70 °,
The packaging machine according to claim 1 or 2. Above the upper end of the second serration, a protruding portion that protrudes beyond the tooth tip of the second serration is provided,
The packaging machine according to claim 2. The temperature of the protrusion is set lower than the temperature of the second seal jaw,
The packaging machine according to claim 4. The protrusion is formed of a material having a lower thermal conductivity than the second seal jaw.
The packaging machine according to claim 5. A heat insulating material is interposed between the protrusion and the second seal jaw;
The packaging machine according to claim 5 or 6. A control unit for controlling the operation of the sealing jaw;
The control unit, when the sealing jaw is in contact with the packaging material to perform the lateral sealing, makes the speed of the sealing jaw along the conveyance direction of the packaging material slower than the conveyance speed of the packaging material,
The packaging machine according to claim 1.

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