JP2006036328A - Bag-making and packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag-making and packaging machine capable of welding the vicinity of a cut portion when cutting a film. <P>SOLUTION: A lateral seal mechanism 6 of the bag-making and packaging machine includes a pair of seal jaws 71 for sealing the film, and includes a protruding cutting edge 21 and a flat receiving edge 22 oppositely as a cutting mechanism 20 for cutting the film. Heat is applied by a heater 72 to the cutting edge 21 during a lateral sealing process, and also vibration is applied within a horizontal plane by an air vibrator 30. Thus, a pressure applied from the cutting edge 21 to the film varies, causing the film to be welded when the pressure is relatively low and the film to be cut when the pressure is relatively high. Thus, the vicinity of the cut portion of the film is welded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag making and packaging machine for forming a packaging bag from a film.

  Conventionally, a bag making and packaging machine that forms a packaging bag by sealing (thermal welding) a film as a packaging material has been used for packaging foods such as snacks and candy.

  In a bag making and packaging machine called a vertical pillow type, first, a sheet-like film is formed in a cylindrical shape by overlapping its side edges. Subsequently, while the film is conveyed vertically downward, the overlapping side edges are sealed (vertically sealed) in the vertical direction (vertical direction), and the position corresponding to the lower portion of the packaging bag is in the horizontal direction (horizontal direction). As a result of being sealed (transversely sealed), an intermediate body bag having an open top as an intermediate body is formed. Then, an article to be packaged is supplied to the opening from above, and the intermediate article bag is filled with the article to be packaged. After that, the intermediate bag is further laterally sealed at the position corresponding to the upper part of the packaging bag, and the vicinity of the laterally sealed position is cut, so that one package in which a packaged item and a predetermined amount of air are packed. A bag is formed.

  Generally, in such a bag making and packaging machine, a horizontal seal (upper seal) for the upper part of the preceding packaging bag and a lower part of the subsequent packaging bag are formed so that a plurality of packaging bags can be formed continuously and at high speed. For this purpose, a horizontal seal (lower seal) is performed in one horizontal sealing process, and the film is also cut in the same horizontal sealing process.

  FIG. 12 is a diagram showing a schematic configuration of a horizontal sealing mechanism for performing a horizontal sealing process in a conventional bag making and packaging machine. The horizontal sealing mechanism is provided with a pair of sealing jaws 101 that are opposed to each other in the horizontal direction across the conveyance path of the film f. In the horizontal sealing step, these two sealing jaws 101 are heated by a heater, and the film f is pressed by the sealing surfaces 102 facing each other, thereby performing horizontal sealing. Each of the sealing jaws 101 includes a notch 103 at the upper and lower central positions, and the sealing surface 102 is separated into two upper and lower portions. The upper seal surface 102a functions to perform a lower seal, and the lower seal surface 102b functions to perform an upper seal.

  In addition, a cutter 105 having a sharp blade for cutting the film f is provided in the notch 103 of one seal jaw 101. When the above-described lateral sealing is completed, the cutter 105 is moved horizontally and enters the notch 103 of the other sealing jaw 101. Thereby, the film f is cut at an intermediate position between the upper seal position and the lower seal position, and the packaging bag 201 is formed.

  Note that, for example, the following documents exist as prior prior documents disclosing the above-described sealing mechanism.

Japanese Patent Publication No. 55-35284

  By the way, in the conventional bag making and packaging machine as shown in FIG. 12, the cut position of the film f is a position opposite to the notch 103 (an intermediate position between the upper seal position and the lower seal position). There is no seal near the location. Accordingly, as shown in FIG. 12, the vicinity of the end 202 of the generated packaging bag 201 is in a state where the film is not welded and can be separated.

  On the other hand, at locations where the vertical seal and horizontal seal overlap in the film, or at both ends in the direction of the horizontal seal, the welding force due to the horizontal seal is affected at other locations due to the effects of film thickness and bending. There is a tendency to lower. Therefore, as shown in FIG. 12, if the vicinity of the end portion (end portion corresponding to the cut portion) of the packaging bag is not welded, air leakage may occur in such a portion.

  This invention is made | formed in view of the said subject, and it aims at providing the bag making packaging machine which can weld the vicinity of a cutting location, when cut | disconnecting a film.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the side edges of the film are overlapped to form a cylinder, and the overlapping side edges are sealed in the first direction and orthogonal to the first direction. A bag making and packaging machine that forms a packaging bag from the film by sealing the film in a second direction, and cuts the vicinity of a target position of the seal in the second direction in the film in the second direction. A cutting unit; a vibrating unit that vibrates the cutting unit; and a heating unit that heats the cutting unit.

  Further, the invention according to claim 2 is the bag making and packaging machine according to claim 1, wherein the cutting means opposes the protruding cutting blade and the flat receiving blade to each other across the film conveyance path. It is arranged and prepared.

  According to a third aspect of the present invention, in the bag making and packaging machine according to the second aspect, the vibration means vibrates the cutting blade.

  According to a fourth aspect of the present invention, in the bag making and packaging machine according to the third aspect, the vibration means vibrates the cutting blade in a plane orthogonal to the first direction.

  According to a fifth aspect of the present invention, in the bag making and packaging machine according to the fourth aspect, the vibration means vibrates the cutting blade along a direction in which the cutting blade and the receiving blade face each other.

  According to a sixth aspect of the present invention, in the bag making and packaging machine according to the fourth aspect, the vibration means rotates the cutting blade in the plane.

  The invention according to claim 7 is the bag making and packaging machine according to claim 2, wherein the vibration means raises the frequency when the cutting blade and the receiving blade are in contact with each other than when they are not in contact with each other.

  According to invention of Claims 1 thru | or 7, since the cutting | disconnection means to which heat was given cuts a film, vibrating, when cutting a film, the vicinity of a cutting location is reliably welded over the whole cutting direction. Can do. Air leakage at the end of the packaging bag, especially where air leakage is likely to occur, where the seal in the first direction and the seal in the second direction overlap, and both ends in the second direction are also welded securely. Can be reliably prevented.

  In particular, according to the invention of claim 2, since the cutting blade and the receiving blade are arranged to face each other, even if the cutting blade is a blunt sword suitable for welding, the film is sandwiched between the cutting blade and the receiving blade. The pressure which can be cut | disconnected with respect to a film can be given by, and a film can be cut | disconnected reliably.

  In particular, according to the invention of claim 3, since the cutting blade is vibrated, the pressure on the film of the cutting blade can be made variable. When the pressure is relatively low, the cutting blade acts to weld the film. When the pressure is high, the cutting blade acts to cut the film, so that the film is reliably welded and cut. be able to.

  In particular, according to the invention of claim 4, since the cutting blade is not vibrated in the first direction, the film can be reliably cut in the second direction.

  In particular, according to the invention of claim 5, the film can be more reliably welded and cut.

  In particular, according to the invention of claim 6, since the movement of the cutting blade along the second direction, which is the cutting direction of the film, occurs, the film can be cut more reliably.

  In particular, according to the invention of claim 7, the film can be cut quickly.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment>
<1-1. Overall configuration>
FIG. 1 is a perspective view of a bag making and packaging machine according to a first embodiment of the present invention. The bag making and packaging machine 1 is a vertical pillow type packaging device having a function of continuously bagging food packages such as snacks and candy. In FIG. 1, a state in which a computer scale 9 is arranged on the upper part of the bag making and packaging machine 1 is shown. The computer scale 9 is a measuring device that measures the object to be packaged by the weighing unit 91 and supplies the object to be packaged to the bag making and packaging machine 1 through the discharge chute 92 at a constant weight.

  As shown in FIG. 1, the bag making and packaging machine 1 mainly includes an apparatus main body 2 and a film supply unit 3 that supplies the apparatus main body 2 with a sheet-like film as a packaging material. On the front side of the housing 4 of the apparatus main body 2, an operation switch 41 that accepts an operation from the user and a liquid crystal display 42 that provides various information to the user are arranged. Furthermore, a control unit (not shown) including a microcomputer for comprehensively controlling the entire apparatus is provided in the housing 4 of the apparatus main body 2.

  In the following description, the three-dimensional XYZ orthogonal coordinates shown in the figure are used as appropriate when indicating the direction and direction. The XYZ axes are fixed relative to the housing 4. Here, the Z-axis direction is the vertical direction, the Y-axis direction is the depth direction (the Y-axis minus side is the front side), and the X-axis direction is the left-right direction when viewed from the front side.

  In the apparatus main body 2, a packaging unit 5 that wraps an article to be packaged using a film is disposed at a position directly below the discharge chute 92 of the computer scale 9.

  FIG. 2 is a diagram illustrating a schematic configuration of the packaging unit 5. As shown in the figure, the packaging unit 5 includes a gathering chute 51 that receives the article to be packaged Ar supplied from the computer scale 9, a tube 52 that conducts the article to be packaged Ar therein, and a sailor unit that supplies the film f. 53, a vertical sealing mechanism 56 that vertically seals the film f, a pair of pull-down belts 55 that convey the film f, and a horizontal sealing mechanism 6 that laterally seals and cuts the film f.

  The film f supplied from the film supply unit 3 to the sailor unit 53 passes through the gap between the sailor unit 53 and the tube 52, so that the side edge portion fv is overlapped to form a cylinder. Then, while the tubular film f is conveyed vertically downward (Z-axis-side) along the tube 52 by the pull-down belt 55, the side edge portion fv of the superimposed film f is longitudinally (Z Axially sealed in the axial direction).

  Subsequently, a position corresponding to the lower portion of the packaging bag in the longitudinally sealed cylindrical film f is laterally sealed along the lateral direction (Y-axis direction) by the lateral sealing mechanism 6, and the lower portion is used as an intermediate body of the packaging bag. Is formed, but an intermediate bag Pi is formed in an open state at the top. When the intermediate bag Pi is formed, an article Ar to be packaged having a constant weight is put into the intermediate bag Pi through the inside of the collecting chute 51 and the tube 52. The intermediate bag Pi containing the article to be packaged Ar is further conveyed by the pull-down belt 55, and the position corresponding to the upper part of the packaging bag is horizontally sealed along the horizontal direction (Y-axis direction) by the horizontal sealing mechanism 6. At the same time, the upper part in the vicinity of the target position of the horizontal seal is cut along the horizontal direction (Y-axis direction). By such a process, one packaging bag Pa in which the article to be packaged Ar and a predetermined amount of air (inert gas or the like) are enclosed is generated. Hereinafter, the horizontal seal at a position corresponding to the lower portion of the packaging bag is referred to as a “lower seal”, and the horizontal seal at a position corresponding to the upper portion of the packaging bag is referred to as an “upper seal”.

<1-2. Horizontal seal mechanism>
In the bag making and packaging machine 1 of the present embodiment, an “upper seal” for the upper part of the preceding packaging bag and a lower part of the subsequent packaging bag are formed so that a plurality of packaging bags can be formed continuously and at high speed. The “lower seal” and the “film cutting” are performed by the horizontal seal mechanism 6 in one horizontal seal process.

  The lateral seal mechanism 6 includes two units, a first unit 61 and a second unit 62. Each of the two units 61 and 62 includes one seal jaw 71. These two sealing jaws 71 are disposed so as to face each other along the X-axis direction with the conveyance path of the film f interposed therebetween, and the respective sealing surfaces are directed to the conveyance path.

  Both of the two units 61 and 62 can be moved linearly by a drive mechanism (not shown) along a guide rail (not shown) extending in the X-axis direction. With such a configuration, the two sealing jaws 71 are in a state where the sealing surfaces are in contact with each other with the film f interposed therebetween (the state shown in FIG. 2), and the sealing surfaces are separated from each other away from the film f conveyance path. Changed between states. In the present specification, not only direct contact but also indirect contact (pressed state) with the film f interposed therebetween is expressed as “contact”.

  In the bag making and packaging machine 1, the conveyance and stop of the film f are continuously repeated. When the film f is transported, the two units 61 and 62 (seal jaw 71) are separated from each other. However, when the transport of the film f is stopped, the two units 61 and 62 are driven in a direction approaching each other. Thus, the sealing surface of the sealing jaw 71 comes into contact. The horizontal sealing process (“lower seal”, “upper seal”, and “film cutting”) is performed in such a state that the sealing surfaces of the two units 61 and 62 are in contact with each other. Hereinafter, a period during which the horizontal sealing step is performed is referred to as a “horizontal sealing period”. The horizontal sealing period is, for example, about 0.1 seconds.

  The horizontal sealing mechanism 6 is also provided with a cutting mechanism for performing “film cutting”. 3 and 4 are diagrams showing the main configuration of the lateral seal mechanism 6 including the cutting mechanism 20. FIG. 3 shows the configuration of the horizontal seal mechanism 6 from the front side (Y axis-side), and FIG. 4 shows the configuration of the horizontal seal mechanism 6 from the upper surface side (Z axis + side). An alternate long and short dash line R shown in these drawings indicates a center position in the X-axis direction of the film transport path. In these drawings, the sealing surfaces 77 of the sealing jaws 71 provided in the two units 61 and 62 are in contact with each other.

  The cutting mechanism 20 of the lateral seal mechanism 6 is composed of two blades, a cutting blade 21 and a receiving blade 22. The cutting blade 21 is provided in the first unit 61, while the receiving blade 22 is provided in the second unit 62. Each of the cutting blade 21 and the receiving blade 22 is provided in a notch 78 formed along the Y-axis direction at the vertical center position of the seal jaw 71.

  FIG. 5 is an enlarged view of the vicinity of the two seal jaws 71 shown in FIG. The sealing surface 77 of the sealing jaw 71 is separated into two upper and lower portions, and a notch 78 is formed between the two sealing surfaces 77a and 77b. In the film f, the position where the upper seal surface 77a contacts is the target position of the lower seal (hereinafter referred to as “lower seal position”), and the position where the lower seal surface 77b contacts is the target position of the upper seal (hereinafter referred to as “lower seal position”). It is called “upper seal position”).

  As shown in the drawing, the cutting blade 21 is disposed along the X-axis direction in the notch 78 of the seal jaw 71 of the first unit 61. On the other hand, the receiving blade 22 is disposed along the X-axis direction in the notch 78 of the second unit 62 sealing jaw 71.

  An end 21a on the X-axis + side of the cutting blade 21 and an end 22a on the X-axis-side of the receiving blade 22 are arranged to face each other in the X-axis direction across the film transport path. The portion 21a and the end portion 22a come into contact with each other so that “film cutting” is performed (details will be described later). Therefore, hereinafter, the end portions 21a and 22a are respectively referred to as “blade edges”. These blade edges 21a and 22a extend along the Y-axis direction so that the film can be cut in the Y-axis direction (see FIG. 4), and the width in the Y-axis direction is the width of the film to be cut in the Y-axis direction. Has been bigger than.

  The cutting edge 21a of the cutting blade 21 protrudes so as to become gradually narrower toward the X axis + side, but the tip of the protrusion is not sharp and has a curved shape. For this reason, it is impossible to cut the film by simply pressing only the cutting edge 21a of the cutting blade 21 against the film f. On the other hand, the cutting edge 21a of the receiving blade 22 is a flat surface.

  Further, the cutting blade 21 is arranged such that the blade edge 21 a protrudes toward the X axis + side from the seal surface 77 of the first unit 61. On the other hand, the receiving blade 22 is disposed such that the cutting edge 22a is positioned backward from the seal surface 77 of the second unit 62 toward the X axis + side. Therefore, in a state where the seal surfaces 77 of the two units 61 and 62 are in contact with each other, the film f present at the position facing the notch 78 (an intermediate position between the lower seal position and the upper seal position) The blade is always pressed by the blade edge 21a and is pushed into the notch 78 of the second unit 62 toward the X axis + side.

  Incidentally, a heater 72 is provided inside the sealing jaw 71. The entire sealing jaw 71 is heated by the heater 72, and the film is sealed (welded) by being pressed from both sides in the X-axis direction by the two sealing surfaces 77 having heat. Further, since the cutting blade 21 and the receiving blade 22 are disposed adjacent to the sealing jaw 71, the heat applied to the sealing jaw 71 is also applied to the cutting blade 21 and the receiving blade 22, and the cutting blade 21 and the receiving blade 22 Both are heated to substantially the same temperature as the sealing jaw 71.

<1-3. Cutting blade vibration>
Returning to FIGS. 3 and 4, the first unit 61 includes an air vibrator 30 as a vibrating body, and the cutting blade 21 is vibrated in a horizontal plane (XY plane) by the air vibrator 30. Yes.

  The air vibrator 30 includes an intake port 31 that takes in air, an exhaust port 32 that discharges air, and a rotor 33 that rotates about a rotation axis along the Z-axis direction. The rotor 33 is arranged eccentrically so that its central position is different from the rotation axis, and rotates at a rotational speed corresponding to the amount of air flowing from the intake port 31. In the air vibrator 30, vibrations in the horizontal plane (XY plane) are generated by such rotational movement of the rotor 33.

  The first unit 61 is roughly divided into a vibration member that is vibrated by the air vibrator 30 and a fixing member that is relatively fixed to the housing 4 within the sealing period. 3 and 4, the vibration member of the first unit 61 is indicated by hatching. The entire configuration of the second unit 62 including the receiving blade 22 is fixed relative to the housing 4 within the sealing period.

  The fixing member of the first unit 61 mainly includes a sealing jaw 71, a jaw base 73 that fixes the sealing jaw 71, and a spring housing 75. The jaw base 73 and the spring housing 75 are shaft-shaped members. The two linear shafts 74 are connected. The four linear shafts 74 are disposed in parallel with each other along the X-axis direction, two at each of the upper part and the lower part. In FIG. 4, illustration of the upper two linear shafts 74 is omitted for convenience.

  On the other hand, the vibration member of the first unit 61 mainly includes the cutting blade 21, a support block 81 that fixes the cutting blade 21 on the X-axis side, a vibration shaft 84, and two linear bushes 82.

  The support block 81 has a shape bent in an L shape when viewed from the front side (Y axis-side), and extends in the vertical direction (Z axis direction) and the first member 81a in the horizontal direction (X axis direction). And a second member 81b that extends. The air vibrator 30 is fixed to the first member 81a in the vertical direction, and the cutting blade 21, the vibration shaft 84, and the linear bush 82 are fixed to the second member 81b in the horizontal direction. Therefore, the vibration generated in the air vibrator 30 is transmitted to the entire vibration member via the support block 81.

  The vibration shaft 84 is disposed on the X axis-side of the support block 81. Therefore, as shown in the drawing, the cutting blade 21, the support block 81, and the vibration shaft 84 are arranged in this order from the X axis + side along the X axis direction. The vibration shaft 84 is inserted so as to be movable with respect to the spring housing 75, and is urged toward the X axis + side by a disc spring 76 provided inside the spring housing 75. As a result, the urging force to the X axis + side is given to the cutting blade 21.

  The linear bush 82 has a cylindrical member. One of the two lower linear shafts 74 is inserted into the cylindrical members of the two linear bushes 82. That is, the linear bush 82 is movable in the X-axis direction with respect to the linear shaft 74. In addition, a plurality of balls, which are adopted as bearings, are disposed in the cylindrical member of the linear bush 82, and the plurality of these balls have some play between the cylindrical member and the linear shaft 74. Ball will intervene. As a result, the linear bushing 82 is also movable in the Y-axis direction with respect to the linear shaft 74. Therefore, the vibration member is arranged to be movable in the XY plane with respect to the fixed member.

  With such a configuration, when the air vibrator 30 generates vibration in the horizontal plane (XY plane), the vibration is transmitted to the cutting blade 21, and the cutting blade 21 vibrates in the horizontal plane (XY plane). Become.

<1-4. Horizontal sealing process>
Next, a horizontal sealing process performed by the horizontal sealing mechanism 6 having the above-described configuration will be described.

  As described above, in the bag making and packaging machine 1, the conveyance of the film and the stop thereof are continuously repeated. When the conveyance of the film is stopped, the two units 61 and 62 are driven so as to approach each other. Is done. Then, when the sealing surfaces 77 of the sealing jaws 71 of the two units 61 and 62 come into contact with each other, the lateral sealing process is started.

  In this lateral sealing step, the film is laterally sealed by being sandwiched from both sides in the X-axis direction by the sealing surfaces 77 of the two units 61 and 62 heated by the heater 72. That is, the lower seal is applied to the film facing the upper seal surface 77a (lower seal position), and the upper seal is applied to the film facing the lower seal surface 77b (upper seal position).

  Along with such a horizontal seal, the cutting blade 21 and the receiving blade 22 sandwich the film present at the position facing the notch 78 (an intermediate position between the lower seal position and the upper seal position), and cut the film. . Hereinafter, a film that is located in the vicinity of the lower seal position and the upper seal position and is located at a position facing the notch 78 is referred to as a “target film”.

  The cutting blade 21 and the receiving blade 22 are always heated by the heater 72. In addition, the air vibrator 30 of the present embodiment is also always driven, whereby the cutting blade 21 is constantly vibrated. Further, as described above, the cutting edge 21 a of the cutting blade 21 protrudes from the seal surface 77 of the first unit 61 toward the X axis + side. Therefore, in the horizontal sealing period, the target film is constantly pressed by the cutting blade 21 thus heated and vibrated. By such an operation, the target film is cut and the vicinity of the cut portion of the target film is welded. That is, the target film is cut and welded at the same time. Hereinafter, this principle will be described.

  6 and 7 are diagrams illustrating the amplitude along the X-axis direction of vibration generated by the air vibrator 30. FIG. As shown in FIG. 6, when the air vibrator 30 is driven, rotational vibration W1 as rotational motion in the XY plane and linear vibration W2 along the X-axis direction are generated. The period T1 of the rotational vibration W1 is longer than the period T2 of the linear vibration W2, and the amplitude of the rotational vibration W1 is larger than the amplitude of the linear vibration W2. The cutting blade 21 is given a superimposed vibration W3 as shown in FIG. 7 in which the rotational vibration W1 and the linear vibration W2 are superimposed. As for the superposed vibration W3, the same waveform is repeated at a cycle T1 (for example, about 0.01 second) as in the case of the rotational vibration W1.

  In the actual horizontal sealing step, the cutting blade 21 comes into contact with the receiving blade 22 when the cutting edge 21a of the cutting blade 21 moves to the X axis + side from a certain position. For this reason, the inter-blade distance between the cutting edge 21a of the cutting blade 21 and the cutting edge 22a of the receiving blade 22 in the actual lateral sealing process changes as shown in FIG. That is, the separation period P1 in which the cutting blade 21 and the receiving blade 22 are separated from each other and the contact period P2 in which the cutting blade 21 and the receiving blade 22 are in contact are alternately repeated.

  Further, the pressure applied to the target film from the cutting blade 21 (hereinafter referred to as “blade pressure”) changes as shown in FIG. As can be seen from a comparison between FIG. 8 and FIG. 9, in the separation period P1, the distance between the blades and the blade pressure act oppositely, and the shorter the distance between the blades, the larger the blade pressure and the longer the distance between the blades. Blade pressure is reduced. On the other hand, in the contact period P2, due to the contact between the cutting blade 21 and the receiving blade 22, the blade pressure becomes significantly larger than that in the separation period P1, and the vibration applied to the cutting blade 21 is directly changed to the blade pressure. Is done. For this reason, a comparatively large blade pressure will change finely in the contact period P2.

  Thus, the blade pressure changes relatively greatly between the separation period P1 and the contact period P2, and also changes finely within each period P1, P2. And in the period (period P3 in a figure) where blade pressure exceeds predetermined value SP, the cutting blade 21 acts so that a target film may be cut | disconnected. On the other hand, during the period when the blade pressure is less than the predetermined value SP, the cutting blade 21 acts not to cut the target film but to weld the vicinity of the portion to be cut. As described above, the cutting edge 21a of the cutting blade 21 has a curved shape, and the fact that the cutting blade 21 is such a blunt blade effectively contributes to the welding of the film. That is, the one cutting blade 21 acts to both cut and weld the target film.

  In addition, “a large change in blade pressure when the state transitions between the separation period P1 and the contact period P2” and “a small change in blade pressure in the contact period P2” are effective for cutting the target film. Contribute. Further, since the cutting blade 21 is rotated in the XY plane, the cutting blade 21 moves in the Y-axis direction while being in contact with the target film in the contact period P2. The movement of the cutting blade 21 in the Y-axis direction, which is the cutting direction, also contributes effectively for cutting the target film. Moreover, since both the cutting blade 21 and the receiving blade 22 are heated, the heat of the receiving blade 22 also contributes effectively to welding of a target film. According to such a principle, both cutting and welding of the target film are performed at the same time.

  As described above, in the bag making and packaging machine 1 according to the present embodiment, the protruding cutting blade 21 and the flat receiving blade 22 face each other across the film conveyance path. The cutting blade 21 that is disposed and heated and vibrated is pressed to a position to be cut by the film. Therefore, when the film is cut, the vicinity of the cut portion can be welded, and the upper and lower ends of the packaging bag generated thereby are reliably welded over the entire Y-axis direction. For this reason, since the welding is surely performed at a location where the vertical seal and the horizontal seal are overlapped or at a location where air leakage is likely to occur, such as both ends in the direction of the horizontal seal (Y-axis direction), the packaging bag Air leakage at the end portion (the end portion corresponding to the cut portion) can be reliably prevented.

  Moreover, in the bag making packaging machine 1, since the cutting blade 21 is vibrated, the pressure (blade pressure) to the film of the cutting blade 21 can be made variable. When the blade pressure is relatively low, the cutting blade 21 acts to weld the film. When the blade pressure is high, the cutting blade 21 acts to cut the film, so that the film is welded and cut. Can be performed reliably. Further, since the cutting blade 21 is vibrated in the horizontal plane (XY plane), the cutting blade 21 does not vibrate in the vertical direction, and the horizontal position to be cut can be reliably cut in the film.

<2. Second Embodiment>
Next, a second embodiment of the present invention will be described. The configuration of the bag making and packaging machine 1 of the present embodiment is substantially the same as that of the first embodiment, but is different from the first embodiment in that the number of rotations of the air vibrator 30 can be controlled. Yes.

  FIG. 10 is a block diagram illustrating a configuration of the bag making and packaging machine 1 according to the control of the rotation speed of the air vibrator 30. As shown in the drawing, air for driving the rotor 33 is supplied to the air vibrator 30 from a compressor 13 serving as an air supply device. An electropneumatic conversion valve 12 is interposed in an air supply pipe 14 as an air flow path from the compressor 13 to the air vibrator 30.

  The electropneumatic conversion valve 12 is a valve that adjusts the amount of air flowing through the air supply pipe 14 in accordance with the value of an electric signal applied. An electrical signal to the electropneumatic conversion valve 12 is transmitted from the control unit 10 that controls the entire bag making and packaging machine 1. As described above, the rotor 33 of the air vibrator 30 vibrates at a rotational speed corresponding to the amount of air flowing in. For this reason, the control part 10 of this Embodiment can control the frequency of the air vibrator 30 by adjusting the value of an electric signal.

  Further, the horizontal seal mechanism 6 of the present embodiment is provided with a contact detection unit 15 for detecting contact between the cutting blade 21 and the receiving blade 22. For example, the contact detection unit 15 detects the contact depending on whether or not an electrical circuit is configured by the cutting blade 21 and the receiving blade 22. The detection result by the contact detection unit 15 is input to the control unit 10. Based on this detection result, the control unit 10 controls the frequency of the air vibrator 30 in the lateral sealing step.

  FIG. 11 is a diagram illustrating a flow of the control operation of the frequency of the air vibrator 30 performed by the control unit 10 in the horizontal sealing step.

  When the horizontal sealing process is started, simultaneously with this, the output of an electric signal from the control unit 10 to the electropneumatic conversion valve 12 is started, and the vibration of the air vibrator 30 is started (step S1). At this time, the frequency of the air vibrator 30 is controlled to a predetermined first frequency. Thereafter, until the lateral sealing by the sealing surface 77 of the sealing jaw 71 is completed (between No in step S6), the processes of steps S2 to S5 are repeated, and the contact / non-contact between the cutting blade 21 and the receiving blade 22 is performed. The frequency of the air vibrator 30 is controlled according to the contact.

  That is, first, the contact detection unit 15 detects whether or not the cutting blade 21 and the receiving blade 22 are in contact (step S2). When the cutting blade 21 and the receiving blade 22 are not in contact (No in step S3: corresponding to the separation period P1), the air vibrator is determined by the value of the electrical signal from the control unit 10 to the electropneumatic conversion valve 12. The frequency of 30 is controlled to the first frequency (step S4). On the other hand, when the cutting blade 21 and the receiving blade 22 are in contact (Yes in step S3: corresponding to the contact period P2), the air vibrator 30 is controlled according to the value of the electrical signal from the control unit 10 to the electropneumatic conversion valve 12. The frequency is controlled to a second frequency higher than the first frequency (step S5). That is, when the cutting blade 21 and the receiving blade 22 are not in contact with each other, the vibration frequency is relatively low, and when the cutting blade 21 and the receiving blade 22 are in contact with each other, the vibration frequency is relatively high. As described above, in the horizontal sealing step, the separation period P1 and the contact period P2 are alternately repeated, and accordingly, the period when the frequency of the air vibrator 30 is high and the period when the frequency is low are alternately repeated. become.

  When the horizontal sealing by the sealing surface 77 is completed (Yes in step S6), the output of the electric signal from the control unit 10 to the electropneumatic conversion valve 12 is stopped, and the vibration of the air vibrator 30 is stopped (step). S7).

  When the cutting blade 21 and the receiving blade 22 come into contact with each other, the vibration of the cutting blade 21 is suppressed by the contact, so that the change in the blade pressure in the contact period P2 is also suppressed (see the contact period P2 in FIG. 9). .) As described above, “the fine change in the blade pressure in the contact period P2” contributes effectively for cutting the target film. Therefore, when the change in the blade pressure is suppressed, the cutting action of the target film is also suppressed. It takes time to cut the target film. For this reason, like this Embodiment, when the cutting blade 21 and the receiving blade 22 are in contact with each other, the time required for cutting the film can be shortened by increasing the frequency as compared with the case of non-contact. Become.

<3. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible.

  For example, in the above-described embodiment, the air vibrator 30 is used as the vibrating body, so that the cutting blade 21 is subjected to the superimposed vibration in which the rotational vibration and the linear vibration are superimposed. An electromagnetic feeder or the like that can only vibrate may be employed so that only linear vibration along the direction in which the cutting blade and the receiving blade face each other (X-axis direction) is applied to the cutting blade 21. This also makes it possible to simultaneously cut and weld the film.

  In the above embodiment, a vertical pillow type bag making and packaging machine has been described as an example of a bag making and packaging machine. However, a horizontal pillow type bag making and packaging machine, etc. Any packaging machine that forms a packaging bag from a film by sealing the overlapping side edges in the first direction and sealing the film in the second direction orthogonal to the first direction. Even in such a case, it is possible to apply the technique according to the present invention.

It is a perspective view of the bag making packaging machine concerning an embodiment of the invention. It is a figure which shows schematic structure of a packaging part. It is a figure which shows the main structures of the horizontal seal | sticker mechanism from the front side. It is a figure which shows the main structures of the horizontal sealing mechanism from an upper surface side. It is an enlarged view of a seal jaw. It is a figure which shows the amplitude of the vibration produced by an air vibrator. It is a figure which shows the amplitude of the vibration produced by an air vibrator. It is a figure which shows the change of the distance between blades between a cutting blade and a receiving blade. It is a figure which shows the change of the pressure which a cutting blade gives to a film. It is a figure which shows the structure which concerns on control of the frequency of an air vibrator. It is a figure which shows the flow of control operation | movement of the frequency of an air vibrator. It is a figure which shows the structure of the horizontal seal mechanism in the conventional bag making packaging machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag making packaging machine 21 Cutting blade 22 Receiving blade 30 Air vibrator 71 Seal jaw 72 Heater 77 Seal surface 78 Notch

Claims (7)

The film is formed by overlapping the side edge portions of the film into a cylindrical shape, sealing the overlapped side edge portions in a first direction, and sealing the film in a second direction orthogonal to the first direction. A bag making and packaging machine for forming a packaging bag from
Cutting means for cutting the vicinity of the target position of the seal in the second direction in the film in the second direction;
Vibration means for vibrating the cutting means;
Heating means for heating the cutting means;
A bag making and packaging machine comprising: The bag making and packaging machine according to claim 1,
The bag making and packaging machine, wherein the cutting means includes a protruding cutting blade and a flat receiving blade arranged to face each other across the film conveyance path. The bag making and packaging machine according to claim 2,
The said vibration means vibrates the said cutting blade, The bag making packaging machine characterized by the above-mentioned. In the bag making and packaging machine according to claim 3,
The vibrating means vibrates the cutting blade in a plane orthogonal to the first direction. The bag making and packaging machine according to claim 4,
The said vibration means vibrates the said cutting blade along the direction where the said cutting blade and the said receiving blade oppose, The bag making packaging machine characterized by the above-mentioned. The bag making and packaging machine according to claim 4,
The bag making and packaging machine characterized in that the vibrating means rotates the cutting blade in the plane. The bag making and packaging machine according to claim 2,
The said vibration means raises a vibration frequency when the said cutting blade and the said receiving blade contact, compared with the time of non-contact, The bag making packaging machine characterized by the above-mentioned.

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