JP3194911U - Packaging machine - Google Patents

Abstract

There is provided a packaging machine provided with a fusing blade having durability equivalent to a fusing blade manufactured from a cermet alloy without using an expensive material such as a cermet alloy. A horizontal sealing mechanism cuts a tubular film with a cutting blade 53 that applies heat and pressure to the tubular film. At least the tip portion of the fusing blade 53 is formed of high-speed tool steel and adjusted to a predetermined hardness by surface treatment. By adjusting the high-speed tool steel, which is a general-purpose material, to a predetermined hardness, it is possible to ensure the same performance as the conventional one, and further, the material cost of the fusing blade 53 is reduced. Processing time is also shortened. [Selection] Figure 4

Description

  The present invention relates to a packaging machine, and more particularly to a packaging machine provided with a film fusing device.

  2. Description of the Related Art Conventionally, as a fusing device for fusing a film, a device for fusing and cutting a film with a fusing blade that applies heat and pressure to the film has been widely used. For example, in the fusing device disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-306445), in order to suppress deterioration of the cutting ability of the fusing blade due to repeated use, a metal double hoe made of ceramic is used as the fusing blade material. Formed using a so-called Cermet alloy, which is a combination of a compound such as Fe (iron), Cr (chromium), Mo (molybdenum), Ni (nickel), and W (tungsten). ing.

  However, although the cutting blade using a cermet alloy is excellent in durability, it is expensive and has a long production lead time, which causes an increase in total cost.

  The subject of this invention is providing the cutting blade which has durability equivalent to the cutting blade manufactured with the cermet alloy, without using expensive materials like a cermet alloy in a packaging machine.

  A packaging machine according to a first aspect of the present invention is a packaging machine that forms a sheet-like film into a cylindrical film, seals it, and fills an object to be packaged while making a bag, and includes a fusing device. The fusing device performs fusing of the tubular film and sealing in the lateral direction. Moreover, the fusing device has a pair of sealing jaws, a fusing blade and a receiving blade, and a heater. The pair of sealing jaws sandwiches the downstream side and the upstream side of the portion to be blown of the tubular film in the lateral direction while turning, and heats to seal. The fusing blade and the receiving blade sandwich the tubular film in the lateral direction and apply heat and pressure to cut the fusing portion of the tubular film. The heater heats the sealing jaw, the fusing blade, and the receiving blade. In addition, the sealing jaw, fusing blade, and receiving blade operate, and the fusing blade and the receiving blade cut off the portion of the tubular film that is scheduled to fusing. End before pinching and sealing. Furthermore, at least the tip portion of the cutting blade is formed of high-speed tool steel and adjusted to a predetermined hardness by surface treatment.

  In this packaging machine, high-speed tool steel, which is a general-purpose material, is applied to the tip portion of the cutting blade and adjusted to a predetermined hardness, thereby ensuring durability equivalent to that of the prior art. As a result, the material cost of the cutting blade is reduced, and the processing time of the cutting blade is also shortened.

  A packaging machine according to a second aspect of the present invention is a packaging machine that forms a sheet-like film into a cylindrical film, seals it, and fills an object to be packaged while making a bag, and includes a fusing device. The fusing device performs fusing of the tubular film and sealing in the lateral direction. Moreover, the fusing device has a pair of sealing jaws, a fusing blade and a receiving blade, and a heater. The pair of sealing jaws sandwiches the tubular film in the horizontal direction and heats it to perform sealing. The fusing blade and the receiving blade sandwich the tubular film in the lateral direction and apply heat and pressure to cut the tubular film. The heater heats the sealing jaw, the fusing blade, and the receiving blade. Also, the sealing jaw, fusing blade, and receiving blade operate to complete the fusing of the tubular film with the fusing blade and the receiving blade, and the sealing surface of the sealing jaw completes the sealing on both sides of the planned fusing portion of the tubular film. Exit before doing. Furthermore, at least the tip portion of the cutting blade is formed of high-speed tool steel and adjusted to a predetermined hardness by surface treatment.

  In this packaging machine, high-speed tool steel, which is a general-purpose material, is applied to the tip portion of the cutting blade and adjusted to a predetermined hardness, thereby ensuring durability equivalent to that of the prior art. As a result, the material cost of the cutting blade is reduced, and the processing time of the cutting blade is also shortened.

  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 front-end | tip of a fusing blade protrudes from the sealing surface of a sealing jaw to the receiving blade side. In this packaging machine, at least the effects of the first aspect or the second aspect can be achieved.

  The packaging machine which concerns on the 4th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: Surface treatment is a nitriding process. In this packaging machine, at least the effects of the first aspect or the second aspect can be achieved.

  The packaging machine which concerns on the 5th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: Surface treatment is a shot peening process. In this packaging machine, at least the effects of the first aspect or the second aspect can be achieved.

  The packaging machine which concerns on the 6th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: Surface treatment is a combined process of a nitriding process and a shot peening process. In this packaging machine, at least the effects of the first aspect or the second aspect can be achieved.

  The packaging machine which concerns on the 7th viewpoint of this invention is a packaging machine which concerns on any one of the 1st viewpoint to the 6th viewpoint, Comprising: Hardness is Hv1000 or more. In this packaging machine, the durability of the cutting blade is improved to the same level as the durability of the cutting blade using a cermet alloy.

  The packaging machine which concerns on the 8th viewpoint of this invention is a packaging machine which concerns on any one of the 1st viewpoint to the 7th viewpoint, Comprising: The width | variety of the blade edge | tip of a fusing blade is 0.05 mm or more and less than 0.2 mm is there.

  In this packaging machine, the wear resistance at the tip of the cutting blade is improved.

  A packaging machine according to a ninth aspect of the present invention is the packaging machine according to any one of the first to eighth aspects, and the high-speed tool steel is SKH51 in Japanese Industrial Standards. With this packaging machine, at least the effects of the first aspect can be achieved.

  The packaging machine which concerns on the 10th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint, Comprising: The front-end | tip of a fusing blade is shape | molded by the waveform along the blade crossing direction. In this packaging machine, since no pressure is applied between the cutting blade and the receiving blade at the time of the film fusing operation, the durability of the fusing blade is improved.

  The packaging machine which concerns on the 11th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint, Comprising: The ridgeline of the front-end | tip of the said cutting blade seen from the blade crossing direction is a circular arc of a predetermined radius. The predetermined radius is equal to the arc diameter of the sealing surface of the sealing jaw. With this packaging machine, at least the effects of the first aspect can be achieved.

  The packaging machine which concerns on the 12th viewpoint of this invention is a packaging machine which concerns on a 1st viewpoint, Comprising: The front-end | tip of a fusing blade is shape | molded by the waveform along the blade crossing direction. Moreover, the virtual surface including the ridgeline at the tip of the cutting blade is an arc curved surface having a predetermined radius that curves along the thickness direction of the cutting blade. The predetermined radius is equal to the arc diameter of the sealing surface of the sealing jaw. With this packaging machine, at least the effects of the first aspect can be achieved.

  In the packaging machine of the present invention, high-speed tool steel, which is a general-purpose material, is applied to the tip portion of the cutting blade and adjusted to a predetermined hardness, thereby ensuring durability equivalent to the conventional one. As a result, the material cost of the cutting blade is reduced, and the processing time of the cutting blade is also shortened.

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 the 1st seal jaw and the 2nd seal jaw which rotate in a transverse seal mechanism. The perspective view of the cutting blade seen from the blade edge | side. Sectional drawing of a seal jaw. The perspective view of the cutting blade of the horizontal sealing mechanism of the packaging machine which concerns on a modification. The side view of the 1st seal jaw and the 2nd seal jaw which rotate in the horizontal seal mechanism of the packaging machine concerning a 2nd embodiment. The time chart of operation | movement of a 1st seal jaw and a 2nd seal jaw. The other time chart of operation | movement of a 1st seal jaw and a 2nd seal jaw. Sectional drawing of the cutting blade of the packaging machine which concerns on 3rd Embodiment. Sectional drawing of the horizontal seal | sticker mechanism before a sealing jaw operate | moves. Sectional drawing of a horizontal sealing mechanism when a sealing jaw starts operation | movement. Sectional drawing of a horizontal sealing mechanism when a 1st sealing jaw and a 2nd sealing jaw contact | adhere. Sectional drawing of a horizontal sealing mechanism when it is made to space apart with the 1st seal jaw and the 2nd seal jaw.

  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 measures the product C and discharges it to 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 bag forming and packaging unit 5 with a film that becomes a bag.

  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. 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 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. The film supply unit 6 is set with a roll around which a film is wound, and a sheet-like film is fed out from the 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 seal mechanism 15, a horizontal seal mechanism 17, and a support frame 12. The forming mechanism 13 forms a film sent in a sheet shape into a cylindrical shape. The pull-down belt mechanism 14 conveys a tubular film (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 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 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 an overlapping portion of the tubular film Fm wound around the tube 13b while pressing the overlapping portion against the tube 13b with a constant pressure to vertically seal the tube 13b. 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) Horizontal seal mechanism 17
The lateral seal mechanism 17 is provided below the tube 13b. The horizontal sealing mechanism 17 heat-seals the tubular film Fm in the horizontal direction by the pair of sealing jaws 51. Further, the lateral sealing mechanism 17 has a fusing blade 53 and a receiving blade 55, and the fusing blade 53 and the receiving blade 55 cut off the intermediate height position of the seal portion by the sealing jaw 51. That is, the horizontal seal mechanism 17 is a fusing device.

(2-3-4-1) First sealing jaw 51a and second sealing jaw 51b
FIG. 3 is a side view of the first seal jaw 51a and the second seal jaw 51b that pivot in the lateral seal mechanism. In FIG. 3, the first seal jaw 51 a is formed with a first hole 517 that opens toward the tubular film Fm, and a first seal surface 516 is formed above and below the first hole 517. (See FIG. 5). For convenience of explanation, the seal surface above the first hole 517 is referred to as a first upper seal surface 516a, and the seal surface below the first hole 517 is referred to as a first lower seal surface 516b.

  Further, the second seal jaw 51b is formed with a second hole 519 that opens toward the tubular film Fm, and a second seal surface 518 is formed above and below the second hole 519 (see FIG. 5). For convenience of explanation, the seal surface above the second hole 519 is referred to as a second upper seal surface 518a, and the seal surface below the second hole 519 is referred to as a second lower seal surface 518b. Both the first seal surface 516 and the second seal surface 518 are arc surfaces having a radius R. In this embodiment, R = 100.

  A heater 51 h is provided in each of the pair of seal jaws 51. When the heater 51h is operated, the entire sealing jaw 51 is heated and the sealing surface is also heated.

(2-3-4-2) Fusing blade 53
A fusing blade 53 is provided in the first hole 517 of the first seal jaw 51a. Hereinafter, the fusing blade 53 will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a perspective view of the fusing blade 53 viewed from the blade tip side. FIG. 5 is a cross-sectional view of the seal jaw 51. In FIG. 4, the tip portion of the fusing blade 53 is formed with a triangular wave-shaped blade edge 53 a along the longitudinal direction. The blade edge 53a has a complicated shape that forms a triangular wave shape when viewed from the front end side or the front side. Further, as shown in FIG. 5, the front end surface of the fusing blade 53 is not a flat surface but an arc surface having a radius R like the first seal surface 516. Note that the front end surface of the fusing blade 53 protrudes from the first seal surface 516 by a distance d. The front end surface of the fusing blade 53 is a virtual surface including a ridge line drawn by the front end of the blade tip formed in a waveform in the blade crossing direction, and is curved with a radius R along the thickness direction of the blade.

  Conventionally, a cermet alloy has been used as the material for the fusing blade 53, so that the material is expensive and the lead time required to process the fusing blade 53 into a complicated cutting edge shape is long, which is a factor in increasing costs. Met.

  The cutting blade 53 of the present embodiment employs a general-purpose high-speed tool steel excellent in workability as a material in order to eliminate the conventional problems. However, as disclosed in paragraph [0042] of Patent Document 1, the durability of the cutting blade made of high-speed tool steel is inferior to that of a cutting blade made of a cermet alloy. Therefore, in the present embodiment, in order to improve the durability of the fusing blade 53, the surface treatment is performed on the tip portion including the blade edge 53a and the hardness of the tip portion is adjusted to be equal to or higher than a predetermined value.

  Specifically, nitriding treatment, shot peening treatment, or a combined treatment of nitriding treatment and shot peening treatment is performed on the tip portion of the cutting blade 53, and the hardness of the tip portion is adjusted to be Hv1000 or more. Yes. In addition, the hardness of the tip portion is about Hv800 when not processed.

  Moreover, the most advanced thickness t of the blade edge 53a shown in FIGS. 4 and 5 is set to 0.05 mm or more and less than 0.2 mm. Further, the cutting edge radius of the cutting edge 53a follows the conventional dimensions, and the radius r is set to 0.05 mm or more and less than 0.2 mm.

  The applicant manufactured the cutting blade 53 with SKH51 in Japanese Industrial Standards for highway tool steel, the first sample S1 subjected to nitriding treatment on the tip portion, the second sample S2 subjected to shot peening treatment on the tip portion, the tip The durability test was performed on the condition that the same film was sealed in the same cycle for the third sample S3 in which the nitriding treatment and the shot peening treatment were combined on the portion, and the fourth sample S4 on which no treatment was performed on the tip portion. I did it. The hardness of the tip portion of the first sample S1 and the third sample S3 is Hv1100 or more, the hardness of the tip portion of the second sample S2 is Hv1000 or more, and the hardness of the tip portion of the fourth sample S4 is less than 900. .

  As a result, the fourth sample S4, which had not been subjected to any treatment on the tip portion, became unbreakable about 3 months after the start of the test. However, the first sample S1 in which the tip portion is subjected to nitriding, the second sample S2 in which the tip portion is subjected to shot peening, and the third portion in which the tip portion is subjected to a combination of nitriding and shot peening. Sample S3 did not become infusible after 6 months. This is the same level of durability as a conventional cutting blade made of a cermet alloy. In particular, the third sample S3 exhibited a durability of 12 million times as the number of times of fusing.

  At the time of horizontal sealing, the cutting edge of the fusing blade 53 faces the receiving blade 55 with the tubular film Fm interposed therebetween. The fusing blade 53 and the receiving blade 55 are heated to substantially the same temperature as the sealing jaw 51 by the heater 51h.

(2-3-4-3) receiving blade 55
A receiving blade 55 is provided in the second hole 519 of the second seal jaw 51b. The front end surface of the receiving blade 55 is recessed from the second seal surface 518 by a distance d.

(3) Operation Next, operations of the first seal jaw 51a and the second seal jaw 51b will be described with reference to FIGS. In addition, the seal jaw shown with the dashed-dotted line in FIG. 3 has shown one locus | trajectory of turning operation | movement.

  The first seal jaw 51a and the second seal jaw 51b rotate so as to draw an arc locus with the tubular film Fm interposed therebetween. First, when the first seal jaw 51a and the second seal jaw 51b turn to start the sandwiching of the tubular film Fm, first, at the lower portions of the first lower seal surface 516b and the second lower seal surface 518b. The tubular film Fm is sandwiched. The first lower seal surface 516b and the second lower seal surface 518b rotate by a certain angle so as to press the arc surface against the tubular film Fm, thereby sealing the tubular film Fm.

  At the same time as the sealing by the first lower seal surface 516b and the second lower seal surface 518b is completed, the fusing blade 53 and the receiving blade 55 sandwich the tubular film Fm. The front end surface of the fusing blade 53 protrudes from the first seal surface 516 by a distance d, and the front end surface of the receiving blade 55 is recessed from the second seal surface 518 by a distance d, so that the front end surface of the fusing blade 53 is a tubular film Fm. The receiving blade 55 is pushed into the recess.

  Since the fusing blade 53 and the receiving blade 55 are heated to almost the same temperature as the sealing jaw 51 by the heater 51h, the portion of the tubular film Fm that has been pushed into the recess of the receiving blade 55 by the front end surface of the fusing blade 53. Fusing.

  After the fusing of the tubular film Fm is completed, the lower portion of the first upper seal surface 516a of the first seal jaw 51a and the second upper seal surface 518a of the second seal jaw 51b sandwich the tubular film Fm. The first upper seal surface 516a and the second upper seal surface 518a rotate by a certain angle so as to press the arc surface against the tubular film Fm, thereby sealing the tubular film Fm.

  Thus, after the fusing of the tubular film Fm by the fusing blade 53 and the receiving blade 55 is completed, the sealing by the first upper seal surface 516a and the second upper seal surface 518a is completed.

(4) Features (4-1)
In this packaging machine, high-speed tool steel is used at least at the tip of the cutting blade 53, and the hardness is adjusted to Hv1000 or more by nitriding or shot peening. Further, the first upper sealing surface 516a of the first sealing jaw 51a and the second upper sealing surface 518a of the second sealing jaw 51b are blown before the sealing is completed across the upstream side of the portion to be blown of the tubular film Fm. Fusing of the scheduled fusing part of the tubular film Fm by the blade 53 and the receiving blade 55 is completed. In this packaging machine, high-speed tool steel, which is a general-purpose material, is applied to the tip portion of the cutting blade and adjusted to a predetermined hardness, thereby ensuring durability equivalent to the conventional one. As a result, the material cost of the cutting blade is reduced, and the processing time of the cutting blade is also shortened.

(4-2)
Moreover, in this packaging machine, since the front-end | tip of the cutting blade 53 is shape | molded in the waveform along a blade span direction, a pressure does not apply at a stretch between the cutting blade 53 and the receiving blade 55 at the time of the cutting operation of the cylindrical film Fm. Therefore, the durability of the cutting blade 53 is improved.

(4-3)
Furthermore, in this packaging machine, the virtual surface including the ridge line at the tip of the cutting blade 53 is an arc curved surface with a predetermined radius that curves along the thickness direction of the cutting blade 53.

(5) Modified Example FIG. 6 is a perspective view of the fusing blade 53 of the lateral seal mechanism 17 of the packaging machine according to the modified example. In FIG. 6, the fusing blade 53 has an effective blade 531 forming a central portion and invalid blades 532 and 533 forming both ends. The effective blade 531 is a part that actually melts the tubular film Fm. The invalid blades 532 and 533 have no function of fusing the tubular film Fm, and have a function of protecting the cutting edge 531a of the effective blade 531 when the effective blade 531 should collide with the seal surface.

  Specifically, at the cutting edge 532 a of the invalid blade 532 and the cutting edge 533 a of the invalid blade 533, the tips protrude from the cutting edge 531 a of the effective blade 531 by C. In this embodiment, C = 0.5 mm, and the protruding portion is rounded with a radius of 0.5 mm to enhance strength and wear resistance.

  Therefore, even when the effective blade 531 collides with the sealing surface (for example, see FIG. 11A) of the second seal jaw 51b facing each other, the cutting edge 532a of the invalid blade 532 and the cutting edge 533a of the invalid blade 533 are advanced. The situation where the cutting edge 531a of the effective blade 531 hits the sealing surface and collides with the sealing surface is avoided. Therefore, chipping or cracking of the cutting edge 531a of the effective blade 531 is prevented.

Second Embodiment
In the first embodiment, the pair of sealing jaws make contact with the circular film Fm while turning, but the present invention is not limited to this. Here, another configuration in which the first seal jaw and the second seal jaw repeat proximity and separation by a turning motion will be described.

(1) Horizontal seal mechanism 117
FIG. 7 is a side view of the first seal jaw 151a and the second seal jaw 151b that rotate in the lateral seal mechanism 117 of the packaging machine according to the second embodiment. In addition, since it is the same as 1st Embodiment except the horizontal seal mechanism 117, description is abbreviate | omitted. In addition, the seal jaw indicated by the dotted line in FIG. 7 indicates the trajectory of the turning motion.

  In the second embodiment, the first sealing jaw 151a and the second sealing jaw 151b turn so as to draw a D-shaped trajectory with the cylindrical film Fm sandwiched between the flat surfaces, and the fusing blade 153 includes the first heater 153h. And the receiving blade 155 has a second heater 155h, which is different from the first embodiment.

  In addition, the control unit individually controls the first heater 153h and the second heater 155h to adjust the fusing blade 153 and the receiving blade 155 to different fusing temperatures.

  Further, the control unit individually controls each of the heaters 51h to adjust the respective portions of the first seal jaw 151a and the second seal jaw 151b to different seal temperatures.

  FIG. 8 is a time chart of the operation of the first sealing jaw 151a and the second sealing jaw 151b. In FIG. 8, the control unit adjusts the operations of the fusing blade 153 and the receiving blade 155. For example, when the first seal jaw 151a and the second seal jaw 151b are swung in a D shape, the fusing blade is used after the first seal jaw 151a and the second seal jaw 151b start to sandwich the tubular film Fm. 153 is pushed out to press the tubular film Fm between the receiving blade 155 and the fusing of the tubular film Fm is started, and the first seal jaw 151a and the second seal jaw 151b are separated from each other to form the tubular film Fm. Before finishing the sandwiching, the fusing blade 153 is moved backward to finish fusing the tubular film Fm.

  That is, the fusing completion time tc is made earlier than the sealing completion time ts while the fusing start time is later than the sealing start time. In this case, when the first sealing jaw 151a and the second sealing jaw 151b are separated from each other at time ts, the bag is separated from the tubular film Fm and dropped.

  FIG. 9 is another time chart of the operation of the first seal jaw 151a and the second seal jaw 151b. In FIG. 9, for example, when the first seal jaw 151a and the second seal jaw 151b turn in a D shape, the first seal jaw 151a and the second seal jaw 151b come into contact with each other and sandwich the tubular film Fm. Before starting the cutting, the fusing blade 153 is pushed out to press the tubular film Fm between the receiving blade 155 and the fusing of the tubular film Fm is started, and the first sealing jaw 151a and the second sealing jaw 151b are The fusing blade 153 may be retracted after the separation and the sandwiching of the tubular film Fm is completed.

  However, the fusing is completed at time tc before the first seal jaw 151a and the second seal jaw 151b are separated. In other words, the fusing start time is set earlier than the seal start time, and the fusing completion time tc is also set earlier than the sealing completion time ts. Also in this case, the bag falls when the first seal jaw 151a and the second seal jaw 151b are separated at time ts.

  As described above, the lateral sealing mechanism 117 of the packaging machine according to the second embodiment includes the first sealing jaw 151a and the second sealing jaw 151b that weld and seal the tubular film Fm, and the predetermined sealing area. A fusing blade 153 and a receiving blade 155 for melting and cutting the part are included. The first seal jaw 151a and the second seal jaw 151b have a heater 51h, the fusing blade 153 has a first heater 153h, and the receiving blade 155 has a second heater 155h. Therefore, it is possible to appropriately cope with both different sealing temperatures and fusing temperatures, and relatively set the first heater 153h and the second heater 155h while setting a relatively low sealing temperature with the heater 51h. A high fusing temperature can be set. As a result, it is possible to quickly melt the same tubular film Fm while avoiding melting and deformation of the tubular film Fm in the seal region.

  Note that the surface of the receiving blade 155 that receives the fusing blade 153 is located behind the sealing surface of the second seal jaw 151b. With this configuration, the tubular film Fm is melted while being pressed, and as a result, it becomes easy to weld and flare is prevented.

<Third Embodiment>
In the second embodiment, the configuration in which the first sealing jaw and the second sealing jaw turn so as to draw a D-shaped trajectory with the tubular film Fm sandwiched between the flat surfaces is described. However, it is not limited to this. For example, the 1st seal jaw and the 2nd seal jaw may be the composition which repeats approach and separation by reciprocating motion. This configuration will be described below as a third embodiment.

(1) Horizontal seal mechanism 217
FIG. 10 is a cross-sectional view of the cutting blade of the packaging machine according to the third embodiment. In addition, the cross-sectional position is the same position as the AOA line of FIG. In FIG. 10, the most advanced thickness t of the blade edge 253a is set to 0.05 mm or more and less than 0.2 mm. Furthermore, the cutting edge radius of curvature of the blade edge 253a is set to a radius of 0.05 mm or more and less than 0.2 mm following the conventional dimensions.

  FIG. 11A is a cross-sectional view of the lateral seal mechanism 217 before the seal jaw 251 operates. In FIG. 11A, the pair of sealing jaws 251 of the lateral sealing mechanism 217 are opposed to each other with the tubular film Fm interposed therebetween. For convenience of explanation, the seal jaw 251 on the left side of the front view in FIG. 11A is referred to as a first seal jaw 251a, and the seal jaw 251 on the right side of the front view in FIG. 11A is referred to as a second seal jaw 251b.

  A first guide hole 513 that opens toward the tubular film Fm is formed in the first seal jaw 251a, and a seal surface is formed vertically with the first guide hole 513 interposed therebetween. The second seal jaw 251b is formed with a second guide hole 515 that opens toward the tubular film Fm, and a seal surface is formed vertically with the second guide hole 515 interposed therebetween.

  A heater 251 h is provided inside each of the pair of seal jaws 251. When the heater 251h is operated, the entire sealing jaw 251 is heated and the sealing surface is also heated.

  A fusing blade 253 is provided in the first guide hole 513 of the first seal jaw 251a. A receiving blade 255 is provided in the second guide hole 515 of the second seal jaw 251b. The cutting edge of the fusing blade 253 is opposed to the receiving blade 255 with the tubular film Fm interposed therebetween. Further, the fusing blade 253 and the receiving blade 255 are heated to substantially the same temperature as the sealing jaw 251 by the heater 251h.

(2) Operation of Lateral Seal Mechanism 217 FIG. 11B is a cross-sectional view of the lateral seal mechanism 217 when the seal jaw 251 starts operation. In FIG. 11B, the control unit causes the first seal jaw 251a and the second seal jaw 251b to approach each other via a drive mechanism (not shown), and the tip of the fusing blade 253 and the tip of the receiving blade 255 are cylindrical. Insert the film Fm. Therefore, the tubular film Fm is pressed with a predetermined pressure from both sides by the fusing blade 253 and the receiving blade 255.

  At this time, since the fusing blade 253 and the receiving blade 255 are heated by the heater 251h, the fusing blade 253 and the receiving blade 255 give heat and pressure to the contact portion with the tubular film Fm, and the tubular film Fm. Cut while welding.

  FIG. 11C is a cross-sectional view of the lateral seal mechanism 217 when the first seal jaw 251a and the second seal jaw 251b are in close contact with each other. In FIG. 11C, the sealing surface of the first sealing jaw 251a and the sealing surface of the second sealing jaw 251b are in close contact with each other with the tubular film Fm interposed therebetween. A biasing member 257 is connected to the rear end portion of the receiving blade 255, and the receiving blade 255 is pushed by the fusing blade 253 and retracts to the back of the second guide hole 515. At this time, the sealing surface heated by the heater 251h heat seals the tubular film Fm over a predetermined time.

  FIG. 11D is a cross-sectional view of the lateral seal mechanism 217 when the first seal jaw 251a and the second seal jaw 251b are separated from each other. In FIG. 11D, after the end of heat sealing, the end portion of the packaging bag generated from the tubular film Fm is in a state of being double-closed by the sealing portion and the fusing portion.

(3) Features (3-1)
In the horizontal sealing mechanism 217, high-speed tool steel is used for the tip portion of the cutting blade 253, and the hardness is adjusted to Hv1000 or more by nitriding or shot peening. As a result, the same performance as that of the conventional cutting blade made of cermet alloy can be secured, the material cost of the cutting blade 253 is reduced, and the processing time of the cutting blade 253 is also shortened.

(3-2)
Since the width of the cutting edge 253a of the fusing blade 253 is 0.05 mm or more and less than 0.2 mm, the wear resistance of the cutting edge 253a is improved.

  As described above, according to the present invention, since the durability of the fusing blade is increased, it is useful not only for the lateral sealing mechanism (fusing device) of a packaging machine but also for an apparatus for fusing a resin member with a heated metal.

17 Horizontal seal mechanism (melting device)
53 Fusing Blade 53a Cutting Edge Fm Cylindrical Film

JP 2006-306445 A

Claims (12)

A packaging machine that forms a sheet-like film into a tubular film, seals and fills an item while making a bag,
Fusing of the tubular film, and a fusing device for performing a lateral seal,
The fusing device is
A pair of sealing jaws that perform sealing by heating, sandwiching the downstream side and the upstream side of the portion to be cut of the tubular film while turning in a lateral direction with an arc-shaped sealing surface;
A fusing blade and a receiving blade that sandwich the tubular film in the lateral direction and apply heat and pressure to melt the fusing scheduled portion of the tubular film; and
A heater for heating the sealing jaw, the fusing blade, and the receiving blade;
Have
The sealing jaw, the fusing blade, and the receiving blade are operated so that the fusing blade and the receiving blade cut the fusing portion, and the sealing surface of the sealing jaw sandwiches the upstream side of the fusing portion. Before closing the seal,
At least the tip portion of the cutting blade is formed of high-speed tool steel and adjusted to a predetermined hardness by surface treatment.
Packaging machine. A packaging machine that forms a sheet-like film into a tubular film, seals and fills an item while making a bag,
Fusing of the tubular film, and a fusing device for performing a lateral seal,
The fusing device is
A pair of sealing jaws that sandwich the tubular film in the lateral direction and heat to seal;
A fusing blade and a receiving blade that sandwich the tubular film in the lateral direction and melt the tubular film by applying heat and pressure;
A heater for heating the sealing jaw, the fusing blade, and the receiving blade;
Have
The sealing jaw, the fusing blade, and the receiving blade operate to blow the tubular film with the fusing blade and the receiving blade, and the sealing surfaces of the sealing jaws are on both sides of the planned fusing portion of the tubular film. Before closing the seal,
At least the tip portion of the cutting blade is formed of high-speed tool steel and adjusted to a predetermined hardness by surface treatment.
Packaging machine. The front end portion of the fusing blade protrudes from the sealing surface of the sealing jaw to the receiving blade side,
The packaging machine according to claim 1 or 2. The surface treatment is a nitriding treatment.
The packaging machine according to claim 1 or 2. The surface treatment is a shot peening treatment,
The packaging machine according to claim 1 or 2. The surface treatment is a combined treatment of nitriding treatment and shot peening treatment,
The packaging machine according to claim 1 or 2. The hardness is Hv1000 or more,
The packaging machine according to any one of claims 1 to 6. The width of the cutting edge of the fusing blade is 0.05 mm or more and less than 0.2 mm.
The packaging machine according to any one of claims 1 to 7. The high-speed tool steel is SKH51 in Japanese Industrial Standard,
The packaging machine according to any one of claims 1 to 8. The tip of the fusing blade is formed into a waveform along the blade crossing direction,
The packaging machine according to claim 1. The ridge line at the tip of the cutting blade viewed from the blade span direction is an arc with a predetermined radius,
The predetermined radius is equal to an arc diameter of the seal surface of the seal jaw;
The packaging machine according to claim 1. The tip of the cutting blade is formed into a wave shape along the blade crossing direction,
The virtual surface including the ridge line at the tip of the cutting blade is an arc curved surface with a predetermined radius that curves along the thickness direction of the cutting blade,
The predetermined radius is equal to an arc diameter of the seal surface of the seal jaw;
The packaging machine according to claim 1.

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