Cutting unit for bag making and packaging machines

Abstract

To solve the problems that paper on the outermost surface is peeled in a conventional cut method, fuzz is formed and an appearance quality degrades, when a craft paper film is used as a packaging material.SOLUTION: A cut unit of a bag-making packaging machine includes a slit 15 that is provided between recession / projection row strip surfaces 11e and 13e and extends in a row direction, a receiving blade side mechanism 9 having a fixed blade composed of a flat blade 21 that is mounted so as to be close to one row side of the slit 15, and a movable blade side mechanism 23 having a movable blade composed of a flat blade 35 whose blade tip projects toward the receiving blade side mechanism 9 from between projection / recession row strip surfaces 25d and 27d, is recession / projection crimped between the recession / projection row strip surfaces 11e and 13e and the projection / recession row strip surfaces 25d and 27d and thrust by approaching / oscillation of the movable blade side mechanism 23, is sandwiched between the blade tip of the flat blade 21 and the slit and is sheared by making the blade tip of the flat blade 35 entering the slit 15, thereby is separated from a subsequent packaging material S. Fuzz is not formed, thrusting and cutting are enabled by one but unit, and accordingly positional deviation between a thrusting position and a cut position is not generated.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a form-fill-seal machine, and more particularly to a cutting unit of a form-fill-seal machine that supplies packaged items during the process of heat-sealing packaging material to form bags, and then cuts the sealed portion to separate them from the subsequent packaging material. [Background technology]

[0002] Plastic film has traditionally been used as a packaging material, but recently, there has been a demand to reduce the amount of plastic used in consideration of the environment, and the use of "kraft paper film" has been proposed as an alternative to plastic film. "Kraft paper film" is a laminated film made from paper as the base material, adding functionality that paper alone cannot provide. An aluminum vapor-deposited barrier film with gas barrier and light-blocking properties is laminated on the inside of the paper, and low-density polyethylene with heat-sealing properties is laminated on the innermost layer, creating a multi-layer structure. It is expected to be made into bags and cut using a bag-making and packaging machine, just like conventional plastic films. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-117271 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when used as an outer bag material for double packaging and passed through the outer bag forming section of the double packaging device described in Patent Document 1, the outermost "paper" that makes up the "kraft paper film" peels off, becoming "fluffy," and the appearance quality deteriorates. The conventional cutting method is a "push cut" method using a flat blade, and when the cutting edge of the flat blade passes over the top surface of the paper, the "paper" is torn off and peels off, creating "fuzz." On the other hand, the conventional cutting method utilizes the periphery of the flat blade of the cutting unit to provide a "ridge marking" function on the sealing surface, making it possible to "ridge mark" and "cut", eliminating misalignment between the ridge marking position and the cut position.

[0005] The present invention was made in response to the above-mentioned conventional problems, and aims to provide a new and useful cutting unit that has a "ridge marking" function similar to conventional cutting units, which prevents misalignment between the ridge marking position and the cutting position, and can eliminate "fuzz" on the cut surface when using "kraft paper film" as a packaging material. [Means for solving the problem]

[0006] The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 relates to a cutting unit of a make-seal machine in which packaging material that has been folded in half so as to open upward and is continuously fed intermittently is heat-sealed to form horizontal and vertical seals to form bags, and the cutting unit separates the packaging material from the subsequent packaging material by cutting the vertical seal. The cutting unit comprises a concave-convex row surface in which concave rows and convex rows are alternately arranged in the vertical direction, a slit provided between the rows of the concave-convex row surface and extending in the row direction, and a receiving blade mechanism having a receiving blade composed of a flat blade attached to one side of the slit, and a mechanism for connecting the receiving blade mechanism to the receiving blade mechanism. The device comprises a convex-concave row surface in which concave rows and convex rows facing the convex-concave row surface are alternately arranged in the up-down direction, and a movable blade side mechanism which has a movable blade composed of a flat blade whose cutting edge protrudes from between the rows of the convex-concave row surface toward the receiving blade side mechanism and which swings toward the receiving blade side mechanism, the cutting edge of the flat blade constituting the movable blade is inclined and protrudes more toward the receiving blade side mechanism as it approaches the swing fulcrum, and the convex-concave row surface of the movable blade side mechanism approaches the convex-concave row surface of the receiving blade side mechanism while pushing out the vertical seal portion, and engages with the vertical seal portion formed on the packaging material which is continuously fed intermittently to form a ridge in the vertical seal portion. doAt the same time, the cutting unit is characterized in that the cutting edge of the movable blade gradually enters the slit from the swing fulcrum side, thereby being sandwiched between the cutting edge of the receiving blade and the vertical seal portion, thereby shearing it and separating it from the subsequent packaging material. The invention of claim 2 is a cutting unit of a bag making and packaging machine described in claim 1, characterized in that the movable blade is configured to be able to retract in the opposite direction to the swing approach direction.

[0007] The invention of claim 3 relates to a cutting unit of a make-seal machine that supplies packaged items during a process in which packaging material that has been folded in half so as to open upward and is continuously fed intermittently is heat-sealed to form horizontal and vertical seals to form bags, and then separates the packaging material from the subsequent packaging material by cutting the vertical seal. The cutting unit of the make-seal machine has a concave-convex strip surface on which concave rows and convex rows are alternately arranged in the vertical direction, slits provided between the rows of the concave-convex strip surface and extending in the row direction, and a receiving blade mechanism having a receiving blade composed of a flat blade attached to one side of the slit, and the concave rows and convex rows facing the concave-convex strip surface of the receiving blade mechanism are alternately arranged in the vertical direction. uneven row surface and a movable blade side mechanism that has a movable blade formed of a round blade whose cutting edge protrudes from between the rows of the concave-convex row surface toward the receiving blade side mechanism and swings toward the receiving blade side mechanism, and the swinging causes the concave-convex row surface of the movable blade side mechanism to approach the concave-convex row surface of the receiving blade side mechanism while pushing out the vertical seal portion, and engages with the vertical seal portion formed on the packaging material that is continuously fed intermittently to form a ridge in the vertical seal portion. do At the same time, the cutting edge of the movable blade is Swing fulcrum This cutting unit is characterized in that the vertical seal portion is sheared and separated from the following packaging material by gradually entering the slit from the side and being pinched between the receiving blade and the cutting edge of the receiving blade.

[0008] The invention of claim 4 is a cutting unit of a bag making and packaging machine described in any one of claims 1 to 3, characterized in that the receiving blade side mechanism has a pair of half-split blocks, the split surfaces of which are used to form a slit and a storage section connected to the slit, and a flat blade holder is incorporated into the storage section. The invention of claim 5 is a cutting unit of a bag-making packaging machine according to any one of claims 1 to 4, characterized in that the movable blade side mechanism comprises a pair of half-split blocks, a slit is formed using the split surfaces of the blocks, and the cutting edge protrudes through the slit. .

[0013] Claim6 The invention is Any of 1 to 5 In the cutting unit of the bag packaging machine described in 2., the concave-convex row surface of the receiving blade side mechanism and the concave-convex row surface of the movable blade side mechanism are Vertical seal Also serves as the clamping surface and is configured to be able to feed packaging materials. This is a cutting unit characterized by the above.

[0015] Claim 7 The invention is Any of 1 to 6 The cutting unit of the bag making and packaging machine described in the above is characterized in that it is used in a bag making and packaging machine in which an inner bag is packaged during the process of making an outer bag in double packaging.

[0016] Claim 8 The invention is Any of 1 to 7 This cutting unit is characterized in that the packaging material to be treated is a kraft paper film in the cutting unit of the bag-making packaging machine described in 1. [Effects of the Invention]

[0017] The cutting unit of the present invention can eliminate fuzz on the cut surface when using kraft paper film as the packaging material. In addition, since the seal surface can be ridged and the seal cut can be performed in one unit, there is no misalignment. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a conceptual diagram of the cooperative relationship between the inner bag setting unit of the packaging device and a bag-making and packaging machine for outer bags. FIG. [Figure 2] 2 is an enlarged perspective view of a main part of the cutting unit according to the first embodiment shown in FIG. 1. FIG. [Figure 3] FIG. 3 is an exploded perspective view of a cutting block of the cutting unit of FIG. 2. [Figure 4] FIG. 3 is a top view of the cutting unit of FIG. 2. [Figure 5] 3 is a diagram showing the relative positions of a movable blade and a fixed blade provided in the cutting unit of FIG. 2. FIG. [Figure 6]FIG. 3 is an overall perspective view of the cutting unit of FIG. 2. [Figure 7] 7 is an overall perspective view of the cutting unit of FIG. 2, seen from a direction different from that of FIG. 6. FIG. [Figure 8] 3 is an explanatory diagram of a shearing operation by the cutting unit of FIG. 2. [Figure 9] FIG. 10 is an overall perspective view of a cutting unit according to a second embodiment. [Figure 10] FIG. 10 is a top view of the main part of the cutting unit of FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0019] The packaging device 1 in Figure 1 double-packs tea bags T, each shaped like a triangular pyramid, as the inner bag. The filled tea bags T are supplied to a bag-making and packaging machine 5 for the outer bag via an inner bag setting section 3 equipped with a hopper, and the tea bags T are packaged during the process of heat-sealing the outer bag.

[0020] In the bag making and packaging machine 5, the continuously fed packaging material S is folded in half with the fold at the center in the width direction so that the opening is at the top, and is fed intermittently one pitch at a time in a stacked state, and during the feeding process, the following processes are sequentially performed. (1) The vertical temporary seal portion Ka is formed by the vertical temporary seal portion 5a. (2) The vertical temporary seal portion Ka is cooled by the upstream cooling portion 5b. (3) The vertical temporary seal portion Ka is cooled by the downstream cooling portion 5c. (4) A pair of widthwise edges Sf of the packaging material S are opened, and the tea bag T is supplied and set in a compartment separated by a pair of vertical temporary seals Ka. (5) The packaging material S is sandwiched between the horizontal seals 5d to form the horizontal seals Sa. (6) Nitrogen gas is filled between the pair of vertical temporary seals Ka in which the tea bag T is set. (7) The main vertical seal 5e forms the vertical seal Sb, which corresponds to the strip-shaped seal.

[0021] When step (7) is completed, the outer bag B is completed, and then the vertical seal Sb is cut (severed) by the cutting unit 7 to separate the outer bag B from the subsequent packaging material S. This cutting unit 7 is one according to the first embodiment of the present invention. As shown in an enlarged view in FIG. 2, the cutting unit 7 is roughly divided into a receiving blade side mechanism 9 and a movable blade side mechanism 23.

[0022] 2 to 4, the receiving blade side mechanism 9 includes a pair of opposing rear cut blocks 11, 13. The rear cut blocks 11, 13 are vertically elongated rectangular parallelepipeds split in half, and the split surfaces are respectively formed with concave grooves 11a, 13a that are identical in shape and extend linearly in the vertical direction, dividing the blocks into a front side and a rear side. The horizontal cross section of the grooves 11a, 13a is a rectangular groove, formed toward the front side. The front-side cut surface 11b of the rear cut block 11 is laterally outwardly recessed by one step from the rear-side cut surface 11c, and its corners are chamfered. The front-side cut surface 13b of the rear cut block 13 is laterally outwardly recessed by one step from the rear-side cut surface 13c.

[0023] The pair of rear cut blocks 11, 13 are joined together by appropriate means at their rear cut surfaces 11c, 13c, and are integrated, while the front cut surfaces 11b, 13b face each other with a gap between them. This gap defines a slit 15. On the rear side, the grooves 11a and 13a are connected to form a single storage section 17 with a rectangular cross section, which communicates with the slit 15. A rectangular parallelepiped holder 19 is housed and fixed in the groove 11a of the housing 17. The base of a thin, rectangular flat blade 21 is placed on the flat surface extending in the vertical direction of the holder 19 and is held in place by tightening bolts, with the cutting edge 21a of the flat blade 21 placed on the cutting surface 11b. The leading edge of the cutting edge 21a is substantially flush with the clamping surface 11d on the front of the back cut block 11. With the flat blade 21 attached, a gap is left between the cutting edge 21a and the cutting surface 13b.

[0024] The clamping surface 11d of the rear cut block 11 and the clamping surface 13d of the rear cut block 13 are on the same plane, and each has a concave-convex row surface 11e, 13e formed thereon except near the edges. These concave-convex row surfaces 11e, 13e have rows of concave and convex strips arranged alternately in the vertical direction, with slits 15 arranged between the rows and extending parallel to the rows.

[0025] The movable blade-side mechanism 23 also has a pair of opposing handling surface cut blocks 25, 27. The handling surface cut blocks 25, 27 are also vertically long, split in half, but are cut out into a large rectangular column shape except for the top and bottom surfaces, and each has an L-shaped recessed rib 25a, 27a in cross section. The cut-out surfaces form the split surface and the front surface, and the pair of handling surface cut blocks 25, 27 have the end surfaces of the top and bottom surfaces 25b, 27b respectively, which are joined together and connected by appropriate means to form an integrated unit, and the recessed portions 25a, 27a are connected to form a single storage section 29 with an approximately square cross section, which opens to the front side.

[0026] On the side of the handling surface cut block 27, the length of the side having the split surface 27b as an end face of the two L-shaped sides is shorter, and when the pair of handling surface cut blocks 25, 27 are integrated, a gap is formed between the split surface 27b and the handling surface cut block 27. This gap forms a slit 31. This slit 31 communicates with the groove portion 27a. This slit 31 penetrates the top and bottom surfaces. In addition, a slit is formed in a direction that is continuous with and perpendicular to slit 31 for receiving a notch forming blade, which will be described later.

[0027] The clamping surface 25c of the handling surface cut block 25 and the clamping surface 27c of the handling surface cut block 27 are on the same plane, and each has a convex / concave row surface 25d, 27d formed thereon except near the edges. These convex / concave row surfaces 25d, 27d have rows of convex and concave stripes arranged alternately in the vertical direction, with slits 31 arranged between the rows and extending parallel to the rows.

[0028] The base of the thin, rectangular flat blade 35 is clamped in a holder 37 and held in place by a bolt, with the cutting edge 35a of the flat blade 35 protruding toward the rear side. The cutting edge 35a is linearly inclined, and the degree to which it protrudes toward the rear side increases as it extends downward. The cutting edge 35a is also single-edged. The holder 37 is housed in the housing portion 29, and the cutting edge 35a of the flat blade 35 passes through the slit 31 and protrudes to the rear side. The holder 37 also holds a notch forming blade 39 .

[0029] The flat blade 35 of the movable blade side mechanism 23 and the flat blade 21 of the receiving blade side mechanism 9 are positioned as shown in Figure 5, so that when the flat blade 35 of the movable blade side mechanism 23 approaches the flat blade 21 of the receiving blade side mechanism 9, the cutting edges 35a, 21a begin to bite into the vertical seal portion Sb, causing cracks to form on both cutting edge sides, and these cracks penetrate to complete the shearing, with the flat blade 35 corresponding to the movable blade and the flat blade 21 corresponding to the fixed blade.

[0030] The configuration relating to the shearing operation of the cutting unit 7 will be described. As shown in FIG. 6, the power of the main drive motor is received by a base plate 41, and the cutting unit 7 is integrally formed so as to be reciprocally movable in the directions indicated by the arrows in FIG. An arm 43 is supported on the base plate 41 so as to be able to swing freely around a swing fulcrum 43a, and one of the pair of swing pieces, 43b, is provided with a roller-shaped cam follower 45a of a cam mechanism 45 so as to be able to rotate freely around its axis. On the other hand, the partner plate cam 45b is rotatably supported on the base plate 41 and uses a spline shaft as its rotation axis. In addition, a spring 46 interposed between the arm 43 and the base plate 41 biases the cam follower 45a in a direction so as to come into pressure contact with the plate cam 45b. The other swing piece 43 c of the arm 43 is connected to the integral handling surface cut blocks 25 , 27 via a recessed mounting portion 47 .

[0031] With the above configuration, rotation of the spline shaft causes the arm 43 to swing against the spring 46 via the cam mechanism 45, which activates the movable blade side mechanism 23 and moves the flat blade 35 closer to the flat blade 21 of the receiving blade side mechanism 9. Since a gap is left in the slit 15 of the receiving blade side mechanism 9, the cutting edge 35a of the flat blade 35 enters the slit 15 and overlaps with the flat blade 21. The cutting edge 35a is inclined and protrudes more as it approaches the swing fulcrum 43a, so that it gradually enters from the swing fulcrum 43a side.

[0032] Since the outer bag B is sent in an inflated state with the tea bag T packed between the flat blade 35 of the movable blade side mechanism 23 and the flat blade 21 of the receiving blade side mechanism 9, the movable blade side mechanism 23 is configured as follows so that the protruding flat blade 35 can move to the front side to prevent it from rubbing against the outer bag B. As shown in FIG. 7, the holder 37 that holds the flat blade 35 is connected to a movable plate 49, which is provided with a pair of recessed grooves 49a. The swing piece 43c of the arm 43 is attached to the outer surface of the recessed bottom of the recessed mounting portion 47, as described above, and a pair of linear guides 47a is provided on the inner surface on the opposite side. The pair of linear guides 47a are slidably fitted into the pair of recessed grooves 49a. The body of an air cylinder 51 is fixed to the inner surface, and the movable plate 49 is fixed to the rod. Therefore, the rod advances and retreats when the air cylinder 51 is driven, allowing the flat blade 35 to retreat within the range of its travel stroke.

[0033] Next, the operation of the cutting unit 7 will be described. As shown in Figure 8(1), the movable blade side mechanism 23 of the cutting unit 7 swings and approaches the receiving blade side mechanism 9, pushing the packaging material S toward the receiving blade side mechanism 9, and as shown in Figure 8(2), the vertical seal portion Sb is clamped by the vertical clamping surfaces 11d and 13d and the vertical clamping surfaces 25c and 27c pressing against each other. During the clamping, the packaging material S is fed laterally. That is, the cutting unit 7 also serves to feed the packaging material S. During clamping, the vertical seal portion Sb is pressed and textured by the engagement of the concave-convex row surfaces 11e, 13e of the receiving blade side mechanism 9, which sandwich the vertical seal portion Sb, with the convex-convex row surfaces 25d, 27d of the movable blade side mechanism 23. Furthermore, the cutting edge 35a of the protruding flat blade 35 of the movable blade side mechanism 23 gradually enters the slit 15 from below, and the vertical seal portion Sb is sandwiched between the cutting edge 21a of the flat blade 21 and sheared.

[0034] When shearing is completed, the packaging material S has been fed for one pitch, so the movable blade side mechanism 23 swings away from the receiving blade side mechanism 9, the clamped state is released, and the preceding outer bag B is separated from the following continuous packaging material S. Thereafter, the cutting unit 7 moves back one pitch, which was advanced by the feeding operation, and repeats the above operation for the subsequent outer bag B that has been made into a bag. During this return, the flat blade 35 protruding from the movable blade side mechanism 23 moves away so as not to rub against the outer bag B.

[0035] The vertical seal Sb is sheared by the cutting unit 7, so even if the packaging material S is made of kraft paper film, no "fuzz" occurs. Furthermore, the vertical seal Sb is "marked" immediately after heat sealing, which further improves the adhesion of the sealed surface. Furthermore, the center of the "marked" portion is always cut. Furthermore, with regard to the cutting unit 7, the blade surface on the flat blade 35 side is automatically sharpened with each cut, making the single edge sharper, which makes it easier to bite into the food, resulting in better blade durability.

[0036] A cutting unit 53 according to the second embodiment can be incorporated into the bag-making and packaging machine 5 in place of the cutting unit 7 according to the first embodiment. The cutting unit 53 will be described with reference to Figures 9 and 10. However, the same components as those of the cutting unit 7 are denoted by the same reference numerals even if there are slight differences in shape, and the description thereof will be omitted. In the cutting unit 53, a round blade 57 is provided in the movable blade-side mechanism 55. An actuator 59 is fixed to the inner surface of the recessed mounting portion 47, and a lifting / lowering portion 63 is connected to a belt (not shown) that transmits power thereto via a connecting portion 61. A recessed groove portion 63a of this lifting / lowering portion 63 is slidably fitted into a linear guide 61a provided on the inner surface.

[0037] A rack 65 is fixed to the inner surface, and a rotor 69, on which a pinion gear 67 meshing with the rack 65 is fitted, is rotatably mounted on the lifting unit 63. The rotor 69 is connected to a holder 71 for the circular blade 57 via a rotation direction changing mechanism 72 that utilizes the meshing of bevel gears. Therefore, when the actuator 59 is driven, the circular blade 57 rotates while moving up and down. The cutting edge 57a of the round blade 57 protrudes from the slit 31, and as it rotates and rises from below during clamping, it gradually enters the slit 15 from below, and the vertical seal portion Sb is sandwiched between the round blade 57 and the flat blade 21, thereby performing shearing.

[0038] Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to these embodiments, and the invention also includes design changes within the scope of the present invention without departing from the gist of the present invention. For example, the packaging material is not limited to kraft paper film, and conventional plastic film may also be used.Compared to conventional cutting units, the blade has a longer lifespan and requires less frequent replacement, making it useful even when plastic film is used as packaging material. In the above embodiment, the cutting unit 7 is incorporated into a horizontal bag-making packaging machine, but it can also be incorporated into a vertical one. Furthermore, it is not limited to double packaging. [Explanation of symbols]

[0039] 1...Packaging device 3...Inner bag setting section 5...Bag making and packaging machine 5a...Vertical temporary sealing section 5b...Upstream cooling section 5c...Downstream cooling section 5d...Horizontal seal section 5e...Vertical main seal section 7...Cutting unit (first embodiment) 9... receiving blade side mechanism 11... rear cut block 11a... groove portion 11b...Front split surface 11c...Rear split surface 11d...Clamp surface 11e...concave and concave row surface 13...back cut block 13a...concave section 13b...Front split surface 13c...Rear split surface 13d...Clamp surface 13e...Rough surface 15...Slit 17...Storage portion 19...Holder 21... Flat blade 21a... Cutting edge 23... Movable blade side mechanism 25...handling surface cut block 25a...concave portion 25b...split surface 25c...Clamping surface 25d...Rough and uneven surface 27...Handling surface cut block 27a...concave portion 27b...split surface 27c...clamp surface 27d...Rough surface 29...Storage portion 31...Slit 35...Flat blade 35a...Cutting edge 37...Holder 39...Notch forming blade 41...base plate 43...arm 43a...oscillating fulcrum 43b...oscillating piece 43c...Oscillator piece 45...Cam mechanism 45a...Cam follower 45b... Plate cam 46... Spring 47... Concave mounting portion 47a... Linear motion guide 49...moving plate 49a...concave groove portion 51...air cylinder 53...Cutting unit (second embodiment) 55... Movable blade side mechanism 57... Round blade 57a... Cutting edge 59... Actuator 61...connecting portion 61a...linear guide 63...lifting portion 63a...concave groove portion 65...Rack 67...Pinion gear 69...Rotating body 71...Holder 72...Rotation direction change mechanism T: Tea bag S: Packaging material Sf: Edge Ka: Vertical temporary seal Sa: Horizontal seal Sb: Vertical seal B: Outer bag

Claims

1. In a cutting unit of a form-fill-seal machine, packaging material is folded in half so that it opens upward and is continuously fed intermittently, and heat-sealed to form horizontal and vertical seals to form bags, during which packaged items are supplied, and the vertical seal is cut to separate the bag from the subsequent packaging material. a concave-convex strip surface in which concave rows and convex rows are alternately arranged in the vertical direction, slits provided between the rows of the concave-convex strip surface and extending in the row direction, and a receiving blade side mechanism having a receiving blade constituted by a flat blade attached to one row side of the slit; a concave-convex row surface in which concave rows and convex rows are alternately arranged in the up-down direction opposite to the concave-convex row surface of the receiving blade side mechanism, and a movable blade side mechanism which has a movable blade composed of a flat blade whose cutting edge protrudes from between the rows of the concave-convex row surface toward the receiving blade side mechanism and which swings toward the receiving blade side mechanism; The cutting edge of the flat blade constituting the movable blade is inclined, and the closer it is to the swing fulcrum, the more it protrudes toward the receiving blade side mechanism, A cutting unit characterized in that, as it swings, the uneven surface of the movable blade side mechanism pushes out the vertical seal portion and approaches the uneven surface of the receiving blade side mechanism, engaging with the vertical seal portion formed on the packaging material that is continuously fed intermittently to create a groove in the vertical seal portion, and the cutting edge of the movable blade gradually enters the slit from the swing fulcrum side, causing the vertical seal portion to be pinched between the cutting edge of the receiving blade and the vertical seal portion to be sheared and separated from the subsequent packaging material.

2. In the cutting unit of the bag making and packaging machine according to claim 1, The cutting unit is characterized in that the movable blade is configured to be able to escape in a direction opposite to the swing approach direction.

3. In a cutting unit of a form-fill-seal machine, packaging material is folded in half so that it opens upward and is continuously fed intermittently, and heat-sealed to form horizontal and vertical seals to form bags, during which packaged items are supplied, and the vertical seal is cut to separate the bag from the subsequent packaging material. a concave-convex strip surface in which concave rows and convex rows are alternately arranged in the vertical direction, slits provided between the rows of the concave-convex strip surface and extending in the row direction, and a receiving blade side mechanism having a receiving blade constituted by a flat blade attached to one row side of the slit; a concave-convex row surface in which concave rows and convex rows are alternately arranged in the up-down direction opposite to the concave-convex row surface of the receiving blade side mechanism, and a movable blade side mechanism which has a movable blade formed of a round blade whose cutting edge protrudes from between the rows of the concave-convex row surface toward the receiving blade side mechanism and which swings toward the receiving blade side mechanism; A cutting unit characterized in that, as the movable blade swings, the uneven surface of the movable blade side mechanism pushes out the vertical seal portion and approaches the uneven surface of the receiving blade side mechanism, engaging with the vertical seal portion formed on the packaging material being fed intermittently and continuously, thereby creating a groove in the vertical seal portion, and as the movable blade then rotates and moves, the cutting edge of the movable blade gradually enters the slit from the swing fulcrum side, causing the vertical seal portion to be pinched between the cutting edge of the receiving blade and the vertical seal portion to be sheared and separated from the subsequent packaging material.

4. In the cutting unit of the bag making and packaging machine according to any one of claims 1 to 3, The receiving blade side mechanism is provided with a pair of half-split blocks, the split surfaces of which are used to form a slit and a storage section connected to the slit, and the flat blade holder is incorporated into the storage section.

5. The cutting unit of the bag-making packaging machine according to any one of claims 1 to 4, The movable blade side mechanism is provided with a pair of half-split blocks, and a slit is formed on the split surface of the blocks, through which the cutting edge protrudes.

6. The cutting unit of the bag-making packaging machine according to any one of claims 1 to 5, The concave-convex row surface of the receiving blade mechanism and the concave-convex row surface of the movable blade mechanism also serve as the clamping surface of the vertical seal part. A cutting unit configured to be capable of feeding packaging material.

7. The cutting unit of the bag-making packaging machine according to any one of claims 1 to 6, A cutting unit characterized by being used in a bag-making and packaging machine in which an inner bag is packaged during the process of making an outer bag in double packaging.

8. The cutting unit of the bag-making packaging machine according to any one of claims 1 to 7, A cutting unit characterized in that the packaging material to be treated is a kraft paper film.

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