JP2016222261A - Bag forming and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag forming and packaging machine in which the visual quality of the cut portion of a packing material.SOLUTION: A bag forming and packaging machine 100 is equipped with a knife 72, a link mechanism and an air cylinder 75. The knife 72 forms a cut portion to be zigzag by cutting the lateral seal part of a cylindrical film Fc. The air cylinder 75 drives the knife 72 via the link mechanism. In a starting point where the knife 72 is in contact with a lateral seal part, an angle θwhich is the incident angle of the knife 72 to the surface of the lateral seal part is 0-15°.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bag making and packaging machine.

  There is known a bag making and packaging machine that individually cuts a bag package by cutting a packaging material with a cutting blade provided on a horizontal sealer (see Patent Document 1 (Japanese Patent Laid-Open No. 2014-094831)).

  When this type of bag making and packaging machine cuts a packaging material by moving the knife in an arc shape, the knife is not horizontally oriented with respect to the surface of the packaging material, but horizontally from an orthogonal axis with respect to the surface. Contact the packaging material from a direction inclined to some extent. Therefore, when the packaging material is cut by the knife that forms the cut portion of the packaging material in a zigzag shape, the zigzag portion is inclined in the horizontal direction with respect to the cut surface. As a result, the cut portion looks worse.

  The subject of this invention is providing the bag making packaging machine which improves the appearance of the cut part of a packaging material.

  A bag making and packaging machine according to a first aspect of the present invention includes a knife, a link mechanism, and a drive unit. The knife forms the cut portion in a zigzag shape by cutting the horizontal seal portion of the tubular film. The drive unit drives the knife via the link mechanism. At the starting point where the knife touches the transverse seal portion, the angle of incidence of the knife relative to the surface of the transverse seal portion is 0 ° to 15 °.

  In the bag making and packaging machine according to the first aspect of the present invention, the incidence angle of the knife with respect to the surface of the lateral seal portion is 0 ° to 15 ° at the starting point where the knife contacts the lateral seal portion. Therefore, the horizontal inclination with respect to the cut surface at the cut portion can be reduced. As a result, the appearance of the cut portion can be improved.

  In the bag making and packaging machine according to the second aspect of the present invention, the drive unit includes a drive member that reciprocates along the extending direction of the knife.

  In the bag making and packaging machine according to the second aspect of the present invention, the knife can be driven by the reciprocating motion of the drive member.

  In the bag making and packaging machine according to the third aspect of the present invention, the link mechanism moves the knife in a direction crossing the extending direction.

  In the bag making and packaging machine according to the third aspect of the present invention, the link mechanism moves the knife in a direction crossing the extending direction, and thus can move the knife in the surface direction of the lateral seal portion.

  In the bag making and packaging machine according to the fourth aspect of the present invention, the link mechanism includes an arc action unit that moves the knife in an arc shape around the fulcrum of the link mechanism.

  In the bag making and packaging machine according to the fourth aspect of the present invention, the arc moving unit moves the knife in an arc shape, whereby the knife can be moved in the surface direction of the lateral seal portion.

  In the bag making and packaging machine according to the fifth aspect of the present invention, the fulcrum is located closer to the knife than the arc operating portion at the starting point of the stroke of the arc operating portion.

  In the bag making and packaging machine according to the fifth aspect of the present invention, since the fulcrum is located on the knife side with respect to the arc motion part, the stroke start point and end point of the arc motion part are opposite to the knife across the fulcrum. Will be on the side and the side of the knife. If it does so, since the amount of movement of the horizontal direction accompanying the stroke of a circular arc operation part is controlled, the inclination of the horizontal direction to a cut surface can further be reduced.

  In the bag making and packaging machine according to the sixth aspect of the present invention, the link mechanism includes a limiting plate that limits the degree of freedom of the link mechanism.

  In the bag making and packaging machine according to the sixth aspect of the present invention, since the restriction plate restricts the degree of freedom of the link mechanism, the reliability of the operation of the link mechanism can be improved.

  In the bag making and packaging machine according to the present invention, since the angle of incidence of the knife with respect to the surface of the horizontal seal portion is 0 ° to 15 ° at the starting point where the knife contacts the horizontal seal portion, the appearance of the cut portion can be improved. it can.

It is a perspective view of the bag making packaging machine concerning one embodiment of the present invention. It is a perspective view which shows schematic structure of a bag making packaging unit. It is a side view of a horizontal seal mechanism. It is a figure explaining the locus | trajectory of the horn and anvil of a horizontal seal mechanism. It is a perspective view of a 1st rotary body and a 2nd rotary body. It is a figure explaining a cutting mechanism. It is a figure explaining the incident angle of the knife as a comparative example. It is a figure explaining the incident angle of the knife of the bag making packaging machine of this embodiment.

  Embodiments of the present invention are shown below. The following embodiments are merely specific examples and do not limit the invention according to the claims.

(1) Configuration of Bag Making and Packaging Machine FIG. 1 is a perspective view of a bag making and packaging machine 100 according to an embodiment of the present invention. The bag making and packaging machine 100 mainly includes a combination weighing unit 200, a bag making and packaging unit 300, a film supply unit 400, an operation switch 500, and a liquid crystal display 600.

  The combination weighing unit 200 is disposed above the bag making and packaging unit 300. The combination weighing unit 200 measures the weight of an object to be packaged with a plurality of weighing hoppers. The combination weighing unit 200 combines the weight values weighed by the respective weighing hoppers so as to obtain a preset total weight. The combination weighing unit 200 supplies the packages to the bag making and packaging unit 300 by discharging the packages having a total weight set in advance downward.

  The bag making and packaging unit 300 puts the articles to be packaged supplied from the combination weighing unit 200 into a bag and seals the bag. Details of the bag making and packaging unit 300 will be described later.

  The film supply unit 400 is disposed adjacent to the bag making and packaging unit 300. The film supply unit 400 includes a roll on which a packaging film is wound, and supplies the film to the bag making and packaging unit 300 by feeding a sheet-like film from the roll.

  The operation switch 500 is an operation switch for operating the bag making and packaging machine 100. The operation switch 500 functions as an input device that receives instructions for the bag making and packaging machine 100 and settings related to the bag making and packaging machine 100.

  The liquid crystal display 600 is a touch panel display. The liquid crystal display 600 functions as an input device that receives instructions for the bag making and packaging machine 100 and settings related to the bag making and packaging machine 100, and also functions as an output device that displays information about the bag making and packaging machine 100.

  The bag making and packaging machine 100 includes a control unit. The control unit is a computer including a CPU, a ROM, a RAM, and the like. The control unit is connected to the combination weighing unit 200, the bag making and packaging unit 300, the film supply unit 400, the operation switch 500, and the liquid crystal display 600. The control unit controls the combination weighing unit 200, the bag making and packaging unit 300, and the film supply unit 400 according to the input from the operation switch 500 or the liquid crystal display 600 and outputs various information to the liquid crystal display 600.

(2) Configuration of Bag Making and Packaging Unit FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit 300. The bag making and packaging unit 300 mainly includes a forming mechanism 310, a pull-down belt mechanism 320, a vertical seal mechanism 330, and a horizontal seal mechanism 340. In this specification, six directions of “front”, “back”, “up”, “down”, “left”, and “right” are defined as shown in FIG. Further, “front” may be referred to as “front” and “rear” may be referred to as “rear”.

  The forming mechanism 310 forms the sheet-like film F conveyed from the film supply unit 400 into a cylindrical shape. The pull-down belt mechanism 320 conveys the film F formed into a cylindrical shape downward. The vertical sealing mechanism 330 seals the overlapping part of both ends of the film F formed into a cylindrical shape in the vertical direction parallel to the transport direction to form the cylindrical film Fc. The horizontal sealing mechanism 340 forms the bag B in which the upper end portion and the lower end portion are horizontally sealed by sealing the tubular film Fc in the horizontal direction orthogonal to the transport direction and separating the sealing portion with a knife.

  Details of each component of the bag making and packaging unit 300 will be described.

(2-1) Forming Mechanism The forming mechanism 310 includes a tube 311 and a former 312. The tube 311 is a cylindrical member having an open upper end and a lower end. An article C to be packaged supplied from the combination weighing unit 200 is inserted into the opening at the upper end of the tube 311. The former 312 is disposed so as to surround the tube 311. When the film F fed out from the film roll of the film supply unit 400 passes through the gap between the tube 311 and the former 312, the film F is wound around the tube 311 and formed into a cylindrical shape. The tube 311 and the former 312 can be replaced according to the size of the bag B to be manufactured.

(2-2) Pull-down belt mechanism The pull-down belt mechanism 320 conveys the film F wound around the tube 311 downward while adsorbing it. The pull-down belt mechanism 320 mainly includes a driving roller 321, a driven roller 322, and a pair of belts 323. As shown in FIG. 2, the pair of belts 323 are arranged so as to sandwich the tube 311 on both the left and right sides of the tube 311, and adsorb the film F formed in a cylindrical shape. In the pull-down belt mechanism 320, the pair of belts 323 are rotationally driven by the driving roller 321 and the driven roller 322, so that the film F formed into a cylindrical shape is conveyed downward.

(2-3) Vertical Seal Mechanism The vertical seal mechanism 330 ultrasonically seals the film F formed into a cylindrical shape in the vertical direction which is the vertical direction. The vertical seal mechanism 330 is disposed on the front side of the tube 311. The vertical seal mechanism 330 is moved in the front-rear direction by the drive mechanism. When the vertical sealing mechanism 330 moves in the rearward direction, that is, so as to approach the tube 311, the overlapping portion of the film F formed into a cylindrical shape is sandwiched between the tube 311 and the vertical sealing mechanism 330. That is, the vertical seal mechanism 330 is pressed against the tube 311 with a constant pressure. In this state, the vertical sealing mechanism 330 ultrasonically seals the film F formed into a cylindrical shape in the vertical direction. Thereby, the tubular film Fc in which the seam of the film F is sealed in the vertical direction is formed.

(2-4) Horizontal Seal Mechanism The horizontal seal mechanism 340 ultrasonically seals the tubular film Fc in the horizontal direction that is the left-right direction. Details of the lateral seal mechanism 340 will be described later.

(3) Details of Lateral Seal Mechanism FIG. 3 is a side view of the lateral seal mechanism 340. More specifically, FIG. 3 is a side view of the lateral seal mechanism 340 viewed from the left side of FIG. FIG. 4 is a diagram for explaining the trajectory of the horn and anvil of the lateral seal mechanism 340. The horizontal seal mechanism 340 mainly includes a first rotating body 50a, a second rotating body 50b, a horizontal driving mechanism 55, and a cutting mechanism 70 (see FIGS. 5 and 6).

  The 1st rotary body 50a is distribute | arranged to the back side (left side in FIG. 3 and FIG. 4) of the cylindrical film Fc. The first rotating body 50a is supported by the first horizontal moving plate 61a. The first rotating body 50a is rotated around the axis C1 by a drive motor (not shown). A first horn 51a and a second anvil 52b for ultrasonic sealing are attached to the first rotating body 50a. The second anvil 52b is disposed at a position 180 degrees away from the first horn 51a around the axis C1 of the first rotating body 50a.

  The second rotating body 50b is disposed on the front side (the right side in FIGS. 3 and 4) of the tubular film Fc. The second rotating body 50b is supported by the second horizontal moving plate 61b. The second rotating body 50b is rotated around the axis C2 by a drive motor (not shown). A first anvil 51b and a second horn 52a for ultrasonic sealing are attached to the second rotating body 50b. The second horn 52a is disposed at a position 180 degrees away from the first anvil 51b around the axis C2 of the second rotating body 50b.

  By rotating the first rotating body 50a around the axis C1 and rotating the second rotating body 50b around the axis C2, the first horn 51a and the first anvil 51b, or the second horn 52a and the second horn The tubular film Fc is sandwiched between the anvils 52b. The sandwiched cylindrical film Fc is laterally sealed along a direction that intersects the transport direction of the tubular film Fc.

  The horizontal driving mechanism 55 moves the first horizontal moving plate 61a and the second horizontal moving plate 61b in the front-rear direction (left-right direction in FIGS. 3 and 4), as indicated by the white arrows in FIGS. . That is, the first rotating body 50a and the second rotating body 50b are brought close to or away from each other.

  The horizontal driving mechanism 55 includes a servo motor 80, a ball screw 80a, a first nut 81, a second nut 82, a pair of first connecting rods 85, and a second connecting rod 86.

  The ball screw 80a is rotated by the servo motor 80. The first nut 81 and the second nut 82 are screwed into the ball screw 80a. 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.

  The first connecting rod 85 is provided along the moving direction of the first horizontal moving plate 61a and the second horizontal moving plate 61b. The first connecting rod 85 connects the first nut 81 and the second horizontal movement plate 61b. The first connecting rod 85 penetrates the first horizontal movement plate 61a in a slidable manner.

  The second connecting rod 86 is provided in parallel to the first connecting rod 85. The second connecting rod 86 connects the second nut 82 and the first horizontal movement plate 61a.

  As described above, in the horizontal driving mechanism 55 described above, the first horizontal moving plate 61a and the second horizontal moving plate 61b can be brought close to or separated from each other by the rotation of the ball screw 80a. By combining the horizontal movement of the first rotating body 50a and the second rotating body 50b by the horizontal driving mechanism 55 and the rotational operation of the first rotating body 50a and the second rotating body 50b, the first horn 51a and second The anvil 52b, the first anvil 51b, and the second horn 52a are swiveled in a D-shape when viewed from the side, as indicated by a two-dot chain line in FIG. In addition, the arrow shown in the dashed-two dotted line part shows the direction of turning.

(4) Outline of Cutting Mechanism FIG. 5 is a perspective view of the first rotating body 50a and the second rotating body 50b. The cutting mechanism 70 is provided for each of the first anvil 51b and the second anvil 52b. The configuration of each cutting mechanism 70 is the same. Here, the cutting mechanism 70 provided in the first anvil 51b will be described, and the description of the cutting mechanism 70 provided in the second anvil 52b will be omitted. The cutting mechanism 70 includes a knife 72 accommodated in the first anvil 51b and an air cylinder 75 as an example of a drive unit.

  The 1st horn 51a has the groove part 73 formed along the horizontal sealing direction, ie, the left-right direction. The 1st anvil 51b has the groove part 74 formed along the horizontal sealing direction. The knife 72 is accommodated in the groove 74. The knife 72 is longer than the length of the groove 74 in the lateral seal direction.

  The air cylinder 75 moves the knife 72 toward the first horn 51a and further moves in the groove 73 in accordance with the timing when the cylindrical film Fc is sealed. The knife 72 separates the bag B from the upstream tubular film Fc.

(5) Details of Cutting Mechanism FIG. 6 is a diagram for explaining the cutting mechanism 70. FIG. 6 is a plan view of the cutting mechanism 70 viewed from the upper side of FIG. FIG. 6 shows the cutting mechanism 70 at the starting point where the knife 72 contacts the tubular film Fc. The cutting mechanism 70 has a link mechanism in addition to the knife 72 and the air cylinder 75.

  The knife 72 cuts the lateral seal portion of the tubular film Fc, thereby separating the bag B from the tubular film Fc. The blade of the knife 72 of this embodiment is formed in a wave blade shape so as to form a cut portion in a zigzag shape.

  The link mechanism moves the knife 72 in a direction that intersects the extending direction of the knife 72, that is, the left-right direction. The link mechanism includes a support member 91, a first link member 92, a second link member 93, a connecting plate 94, and a limiting plate 95.

  The support member 91 supports the first link member 92 and the second link member 93 and supports the air cylinder 75. The support member 91 has a rectangular shape that is long in the extending direction of the knife 72 as a whole. The support member 91 has two protrusions formed at positions separated from each other, that is, a protrusion 91a and a protrusion 91b. Each of the protruding portion 91 a and the protruding portion 91 b protrudes toward the knife 72 from the long side facing the knife 72 among the two long sides of the support member 91.

  The first link member 92 is disposed on the support member 91. The first link member 92 has a rectangular shape with rounded corners as a whole. The first link member 92 has a protruding portion 92a. The protruding portion 92 a protrudes from one end of the first link member 92 in the short direction of the first link member 92. One end of the first link member 92 is disposed and fixed on the protruding portion 91 a of the support member 91. Although described later in detail, the fixed portion functions as a fulcrum 92b when the first link member 92 rotates. The other end of the first link member 92 is fixed to a piston rod described later.

  The second link member 93 is disposed on the support member 91 and at a position away from the first link member 92 in the extending direction of the knife 72. The second link member 93 has a rectangular shape with rounded corners as a whole. The second link member 93 has a protruding portion 93a. The protruding portion 93 a protrudes from one end of the second link member 93 in the short direction of the second link member 93. One end of the second link member 93 is disposed and fixed on the protruding portion 91 b of the support member 91. Although described in detail later, the fixed portion functions as a fulcrum 93b when the second link member 93 rotates.

  The connecting plate 94 connects the first link member 92 and the second link member 93. The connecting plate 94 is disposed to face the support member 91. The first link member 92 and the second link member 93 are disposed in a space between the support member 91 and the connecting plate 94. The connecting plate 94 is fixed to the first link member 92 at the protruding portion 92 a of the first link member 92. As will be described in detail later, the fixed portion of the projecting portion 92a to the connecting plate 94 functions as an arc motion portion 92c that rotates about a fulcrum 92b. The connecting plate 94 is fixed to the second link member 93 at the protruding portion 93 a of the second link member 93. As will be described in detail later, the fixed portion of the projecting portion 93a to the connecting plate 94 functions as an arc motion portion 93c that rotates about a fulcrum 93b.

Here, the line segment extending in the extending direction of the knife 72 through the fulcrum 92b is defined as a line segment L _1, it defines a line segment that passes through the fulcrum 92b and the arc operation portion 92c and the line segment L _2. In the present embodiment, the angle θ ₁ formed by the line segment L ₁ and the line segment L ₂ is 10 °. As already explained, FIG. 6 shows the cutting mechanism 70 at the starting point where the knife 72 contacts the tubular film Fc. Therefore, the angle θ ₁ corresponds to the incident angle of the knife 72 with respect to the surface of the tubular film Fc at the starting point where the knife 72 contacts the tubular film Fc.

  The connecting plate 94 supports the knife 72 by fixing both ends of the knife 72 via a fixing member.

  The limiting plate 95 is fixed to the first link member 92 and the second link member 93. More specifically, the limiting plate 95 is a rod-shaped plate, and one end is fixed to the first link member 92 and the other end is fixed to the second link member 93. The limiting plate 95 is disposed in a space between the support member 91 and the connecting plate 94. Although described later in detail, the restriction plate 95 restricts the operation direction of the first link member 92 and the second link member 93.

  The air cylinder 75 is disposed at a position close to the support member 91. The air cylinder 75 drives the knife 72 via a link mechanism. The air cylinder 75 includes a cylinder tube 76 to which compressed air is supplied, a piston 77 disposed in the cylinder tube, and a piston rod 78 as an example of a drive member. The piston 77 is attached to the other end of the piston rod 78. The piston rod 78 reciprocates along the extending direction of the knife 72.

  By supplying and exhausting compressed air into the cylinder tube 76, the piston 77 reciprocates in the extending direction. Therefore, the piston rod 78 attached to the piston 77 reciprocates in the extending direction. The reciprocating motion of the piston rod 78, that is, rectilinear motion, is converted into rotational motion by the link mechanism. When the first link member 92 fixed to the piston rod 78 moves, the second link member 93 moves so as to follow the operation of the first link member 92. More specifically, when the first link member 92 is rotated, the movement is transmitted to the second link member 93 via the connecting plate 94, and the second link member 93 swings.

  As described above, when the first link member 92 and the second link member 93 operate, that is, by rotating, the knife 72 moves in an arc shape according to the rotating motion. In this case, the knife 72 contacts the tubular film Fc from a direction inclined in the horizontal direction from the orthogonal axis with respect to the surface of the tubular film Fc. In a general bag making and packaging machine, the incident angle with respect to the surface of the tubular film Fc at the starting point where the knife comes into contact with the tubular film is about 45 ° as will be described later.

  On the other hand, in the bag making and packaging machine 100 of the present embodiment, the incident angle with respect to the surface of the tubular film Fc at the starting point where the knife 72 contacts the tubular film Fc is 10 °. Since the horizontal inclination can be reduced, the appearance of the cut portion can be improved.

(6) Incident angle of knife with respect to surface of cylindrical film FIGS. 7A and 7B are diagrams illustrating the incident angle of the knife 72 with respect to the surface of the cylindrical film Fc. Specifically, FIG. 7A is a diagram for explaining the incident angle of a knife as a comparative example, and FIG. 7B is a diagram for explaining the incident angle of the knife 72 of the bag making and packaging machine 100 of the present embodiment. It should be noted that the stroke amount of the arcuate motion part in FIG. 7A and the stroke amount of the arcuate motion part 92c in FIG. 7B are the same.

In FIG. 7A, a point P ₀ is a fulcrum of the link member and corresponds to the fulcrum 92b of the present embodiment. Point P ₁ is the starting point of the stroke of the circular motion portion. Point P ₂ is the end point of the stroke of the circular motion portion. Point P ₃ is a point indicating the position of the arc operation unit at the start of the knife is in contact with the tubular film. Angle theta ₂ formed by the line segment _{L 3} extending in the extending direction of the knife through the point _{P 0,} and _{L 4} passing through the point _{P 0} and the point _{P 3} is 45 °. That is, the angle of incidence of the knife with respect to the surface of the tubular film at the starting point where the knife contacts the tubular film is 45 °. The width W2 is the stroke amount in the lateral direction of the point P ₂ from the point P _1, that is, from the start point of the stroke of the arc operation portion to the end point. Depth D2 is the stroke amount of the front-rear direction from the point _{P 1} to point _{P 2.}

In FIG. 7B, the fulcrum 92b is a fulcrum of the first link member 92 as already described. Point _{P 4} is the starting point of the stroke of the circular motion portion 92c. Point _{P 5} is an end point of the stroke of the circular motion portion 92c. The point P ₆ is a point indicating the position of the arc operation portion 92c at the start of the knife 72 is in contact with the tubular film Fc. As already described, the angle θ ₁ formed by the line segment L ₁ and the line segment L ₂ is 10 °. The width W1 is a stroke amount in the lateral direction of the point P ₅ from the point P _4, that is, from the start point of the stroke of the arc operation portion 92c to the end point. Depth D2 is the stroke amount of the front-rear direction from the point _{P 4} to the point _{P 5.}

  As is apparent from FIGS. 7A and 7B, the width W1 is smaller than the width W2, while the depth D1 is larger than the depth D2. That is, in the knife 72 of this embodiment, the stroke amount in the left-right direction is small and the stroke amount in the front-rear direction is large compared to the knife of the comparative example.

In particular, in the bag making and packaging machine 100 of the present embodiment, the start point of the stroke of the arc operation portion 92c, the knife 72 across the line L ₁ on the opposite side. In other words, the fulcrum 92b is located closer to the knife 72 than the arc operating portion 92c at the starting point of the stroke of the arc operating portion 92c. Therefore, the amount of movement of the knife 72 in the left-right direction can be further reduced. As a result, the knife 72 is in contact with the surface of the tubular film Fc in a state of being closer to a right angle with respect to the surface of the tubular film Fc. Therefore, the appearance of the cut portion can be improved. In addition, the starting point of the stroke of the arc operation portion 92c, the knife 72 across the line L ₁ by opposite, the pop-out amount of the knife 72, i.e. a sufficient amount of movement in the longitudinal direction You can also.

Here, the start point of the stroke of the circular motion portion 92c is, the knife 72 across the line segment L ₁ when located on the opposite side, the degree of freedom of the link mechanism can be two. However, in the bag making and packaging machine 100 of the present embodiment, the restriction plate 95 restricts the degree of freedom of the first link member 92 and the second link member 93, so the degree of freedom of the link mechanism is 1. Therefore, the reliability of the operation of the link mechanism can be improved.

(7) Features The bag making and packaging machine 100 of the above embodiment includes a knife 72, a link mechanism, and an air cylinder 75. The knife 72 cuts the horizontal seal portion of the tubular film to form the cut portion in a zigzag shape. The air cylinder 75 drives the knife 72 via a link mechanism. At the starting point where the knife 72 is in contact with the lateral seal portion, the angle θ ₁ that is the incident angle of the knife 72 with respect to the surface of the lateral seal portion is 0 ° to 15 °.

In the bag making and packaging machine 100 of the above embodiment, at the start of the knife 72 is in contact with the laterally sealed portion, the angle theta ₁ is the incident angle of the knife 72 relative to the surface of the laterally sealed portion is 15 ° from 0 °. Therefore, the horizontal inclination with respect to the cut surface at the cut portion can be reduced. As a result, the appearance of the cut portion can be improved.

  In the bag making and packaging machine 100 of the above embodiment, the air cylinder 75 includes a piston rod 78 that reciprocates along the extending direction of the knife 72.

  In the bag making and packaging machine 100 of the above embodiment, the knife 72 can be driven by the piston rod 78 reciprocating.

  In the bag making and packaging machine 100 of the above embodiment, the link mechanism moves the knife 72 in a direction that intersects the stretching direction.

  In the bag making and packaging machine 100 of the above-described embodiment, the link mechanism moves the knife 72 in a direction crossing the extending direction, so that the knife 72 can be moved in the surface direction of the lateral seal portion.

  In the bag making and packaging machine 100 of the above-described embodiment, the link mechanism includes the arc operating portion 92c that moves the knife 72 in an arc shape around the fulcrum 92b of the link mechanism.

  In the bag making and packaging machine 100 of the above-described embodiment, the arc moving unit 92c moves the knife 72 in an arc shape, whereby the knife 72 can be moved in the surface direction of the lateral seal portion.

  In the bag making and packaging machine 100 of the above embodiment, the fulcrum 92b is located closer to the knife 72 than the arc operating portion 92c at the starting point of the stroke of the arc operating portion 92c.

  In the bag making and packaging machine 100 of the above embodiment, the fulcrum 92b is located closer to the knife 72 than the arc operating portion 92c at the starting point of the stroke of the arc operating portion 92c. Therefore, the starting point and the ending point of the stroke of the circular arc moving part 92c exist on the opposite side of the knife 72 and the knife 72 with the fulcrum 92b interposed therebetween. As a result, the amount of movement in the horizontal direction associated with the stroke of the arc operating portion 92c is suppressed, so that the horizontal inclination with respect to the cut surface can be further reduced.

  In the bag making and packaging machine 100 of the above embodiment, the link mechanism includes the limiting plate 95 that limits the degree of freedom of the link mechanism.

  In the bag making and packaging machine 100 of the above-described embodiment, the restriction plate 95 restricts the degree of freedom of the link mechanism. Specifically, the limit plate 95 limits the degree of freedom of the link mechanism from 2 to 1. Therefore, the reliability of the operation of the link mechanism can be improved.

(8) Modified Example In the above description, the incidence angle of the knife 72 with respect to the surface of the tubular film Fc is 10 ° at the starting point where the knife 72 is in contact with the tubular film Fc. From 15 °.

  In the above description, a bag making and packaging machine that performs ultrasonic sealing as an example of the bag making and packaging machine is described as an example, but other bag making and packaging machines may be used. For example, a bag making and packaging machine that performs heat sealing may be used.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process in the apparatus shown in the claims, the description, and the drawings is not clearly indicated as “before”, “prior”, etc., and the output of the previous process is not specified. It should be noted that they can be implemented in any order unless used in later processing. Regarding the claims, the specification, and the drawings, even if “first”, “next”, etc. are used for convenience, it does not mean that it is essential to implement in this order.

72 Knife 75 Air cylinder 78 Piston rod 92 First link member 92b Support point 92c Arc action part 93 Second link member 93b Support point 93c Arc action part 95 Limit plate 100 Bag making and packaging machine

JP 2014-094831 A

Claims (6)

A knife that zigzags the cut portion by cutting the transverse seal portion of the tubular film; and
A link mechanism;
A drive unit that drives the knife via the link mechanism;
The bag making and packaging machine, wherein the angle of incidence of the knife with respect to the surface of the lateral seal portion is 0 ° to 15 ° at a starting point where the knife touches the lateral seal portion.   The bag making and packaging machine according to claim 1, wherein the drive unit includes a drive member that reciprocates along the extending direction of the knife.   The bag making and packaging machine according to claim 2, wherein the link mechanism moves the knife in a direction crossing the extending direction.   The bag making and packaging machine according to any one of claims 1 to 3, wherein the link mechanism includes an arc action unit that moves the knife in an arc shape around a fulcrum of the link mechanism.   5. The bag making and packaging machine according to claim 4, wherein the fulcrum is positioned closer to the knife than the arc operating portion at a starting point of a stroke of the arc operating portion.   The bag making and packaging machine according to claim 5, wherein the link mechanism includes a limiting plate that limits a degree of freedom of the link mechanism.

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