Cutter unit and automatic filling machine provided with the same

Abstract

To provide a cutter unit which suppresses the wear of tips of a fixed blade and a rotary blade, and elongates the continuously usable life thereof.SOLUTION: A cutter unit includes one sheet or two sheets of fixed blades consisting of full cutting blades otherwise perforation blades or gather blades which face each other and a rotary blade, brings the blade top of the fixed blade and the blade top of the rotary blade into sliding contact with each other by rotation and, thereby, cuts an object, otherwise, forms perforation for cutting onto the object. The cutter unit is characterized in that: a constant pressure mechanism has guide means which supports the fixed blade advance / retreat-movably with respect to the rotation center of the rotary blade and, at the same time, guides advance / retreat movement of the fixed blade, and fixed blade energizing means which always energizes the fixing blade with constant force toward the rotation center of the rotary blade under guide by means of the guide means.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cutter unit that cuts strip-shaped materials such as film, paper, thin metal film, etc., and in particular to a cutter unit that cuts a continuous bag consisting of multiple packaging bags filled with packaged items connected in a strip-like shape into individual or multiple packaging bags, or forms cutting perforations between each packaging bag in the continuous bag, and an automatic filling and packaging machine equipped with such a cutter unit. [Background technology]

[0002] 2. Description of the Related Art In recent years, it has become common to pack liquid or viscous substances, such as food and drink, seasonings, medicines, cosmetics, and other fluid packaged items in packaging bags made of packaging films.

[0003] Packaging bags in which the above-mentioned packaged items are packaged are formed by various automatic filling and packaging machines. For example, in the case of three-sided sealed bags, a soft, strip-shaped laminated film, which is made of at least a base film layer and a sealant layer, both of which are made of resin films, is fed from the top to the bottom of the automatic filling and packaging machine, while being folded back at the center in the width direction so that the sealant layers face each other, and both side ends are overlapped to form a double layer.

[0004] Next, the laminated film is sandwiched between a pair of vertical sealing rolls that are arranged horizontally and parallel to each other and rotate in opposite directions, and is sent downward while being continuously heated, so that vertical seal portions are formed by heat sealing along the overlapped side edges of the laminated film to form a tubular film, and the tubular film is further sandwiched sequentially between, for example, two pairs of horizontal sealing rolls that are arranged horizontally and parallel to each other and rotate in opposite directions, and is sent downward while being intermittently heated and cooled, so that horizontal seal portions are formed by heat sealing across the entire width of the overlapped laminated film, with intervals between them along the longitudinal direction of the overlapped laminated film.

[0005] In this process, after forming the lower of the two horizontal seals spaced apart above and below, the packaged item is filled between the two layers of laminated film above the lower horizontal seal and before forming the upper horizontal seal, and the packaged item is stored in the packaged item storage space surrounded by the vertical seals, the two upper and lower horizontal seals, and the folded end, thereby forming a continuous bag in which multiple packaging bags filled with the packaged item are connected in a strip-like shape.

[0006] Thereafter, the string of packets is cut into individual or multiple packaging bags by cutting the string of packets at predetermined positions of the horizontal seals formed at intervals along the longitudinal direction of the string of packets with a cutter unit provided in the automatic filling and packaging machine in a straight line or a jagged shape according to the specifications of the string of packets, or by forming perforations for cutting between each packaging bag of the string of packets, the string of packets can be easily cut into any number of bags.

[0007] A known conventional cutter unit for cutting or making cuttable continuous packets in this way is, for example, that described in Patent Document 1. The cutter unit described in Patent Document 1 is disposed below the horizontal seal roll of an automatic filling and packaging machine, and while horizontally clamping the horizontal seal portion of the continuous packet descending from the horizontal seal roll between a fixed blade and a rotary blade and sending it downward, cuts the horizontal seal portion or forms perforations in the horizontal seal portion according to the shapes of the blades. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 2685066 Summary of the Invention [Problem to be solved by the invention]

[0009] Incidentally, all of the above-mentioned conventional cutter units have a full-cut blade as a fixed blade, and the tips of the blades are brought into sliding contact with each other to clamp the continuous bag and cut it in a straight line, or a straight-line full-cut blade as a rotary blade while a perforation blade is brought into sliding contact with each other to clamp the continuous bag and form perforations. In order to select this, the full-cut blade and the perforation blade are arranged overlapping each other as fixed blades, and when cutting the horizontal seal portion, the full-cut blade as a fixed blade and the perforation blade are used while remaining overlapping, and when forming perforations in the horizontal seal portion, the full-cut blade as a fixed blade is lifted slightly from the perforation blade by an air cylinder to move its tip away from the rotational trajectory of the tip of the full-cut blade as a rotary blade, and only the perforation blade is used as the fixed blade.

[0010] In addition, since the above-mentioned conventional cutter unit uses a straight full-cut blade as the rotating blade, a gathering blade for cutting the chain bag in a jagged shape cannot be used as the fixed blade. Therefore, when the chain bag is specified to cut the horizontal seal portion in a jagged shape, the automatic filling and packaging machine is equipped with a second cutter unit which uses gathering blades as the rotating blade and fixed blade and slides the tips of the blades against each other to pinch the chain bag and cut it in a jagged shape, located upstream or downstream of the first cutter unit which cuts in a straight line or forms a perforation, and can be selectively operated in conjunction with the first cutter unit.

[0011] However, in the configuration in which the full-cut blade and perforation blade of the first cutter unit described above are arranged overlapping each other, it is extremely difficult to perform the blade alignment work of fine-tuning the blade contact between the full-cut blade as a rotating blade and each of the perforation blade and full-cut blade as fixed blades. Also, the blade alignment work of fine-tuning the blade contact between the rotating blade and the gathering blade as a fixed blade of the second cutter unit described above is difficult. In either case, the blade tip wears out quickly especially if the blade contact is too strong, so the blade alignment work requires high skill from the worker, and there is a problem that the continuous usable life of the cutter unit is shortened if the blade alignment work is not performed properly.

[0012] Therefore, an object of the present invention is to provide a cutter unit that solves the above-mentioned problems associated with the conventional technology and contributes to extending the continuous usable life of the cutter unit, and an automatic filling and packaging machine equipped with the same. [Means for solving the problem]

[0013] The cutter unit of the present invention, which advantageously solves the above problems, comprises: A cutter unit has one or two fixed blades and a rotary blade, each of which is a full-cut blade, a perforation blade, or a gathering blade, facing each other, and cuts an object or forms a perforation for cutting in the object by bringing the cutting edge of the fixed blade and the cutting edge of the rotary blade into sliding contact with each other by rotation of the rotary blade, a guide means for supporting the fixed blade so as to be movable back and forth relative to a rotation center of the rotary blade and for guiding the forward and backward movement of the fixed blade; a fixed blade biasing means for constantly biasing the fixed blade with a constant force toward the center of rotation of the rotary blade under guidance by the guide means; The present invention is characterized by having a constant pressure mechanism having a constant pressure.

[0014] In addition, the automatic filling and packaging machine of the present invention, which advantageously solves the above problems, comprises: a vertical seal unit that sandwiches a soft, strip-shaped laminated film, which is made of at least a base film layer and a sealant layer, both of which are made of resin films, between a pair of vertical seal rolls that are arranged horizontally in parallel to each other and rotate in opposite directions, continuously heats the laminated film, and sends it downward to form vertical seals by heat sealing along the overlapped side edges of the laminated film, thereby forming a tubular film; a horizontal seal unit in which the tubular film is sandwiched between a pair of horizontal seal rolls arranged parallel to each other in the horizontal direction and rotating in opposite directions, and heated intermittently, or sandwiched between two pairs of horizontal seal rolls, and fed downward while being intermittently heated and cooled, thereby forming horizontal seal portions by heat sealing over the entire width of the stacked laminated film at intervals along the longitudinal direction of the stacked laminated film; A packaging material filling unit fills a gap between the two laminated films on the upper side of the lower horizontal seal portion between the lower horizontal seal portion and the upper horizontal seal portion of the two horizontal seal portions formed at an interval above and below; In an automatic filling and packaging machine for forming a continuous bag in which a plurality of packaging bags filled with a packaged article are connected in a belt shape, The cutter unit of the present invention is provided below the horizontal seal unit. Effect of the Invention

[0015] In the cutter unit of the present invention and an automatic filling and packaging machine equipped with the same, the guide means of the constant pressure mechanism supports the fixed blade so that it can move back and forth relative to the center of rotation of the rotary blade and guides the movement of the fixed blade back and forth, and under the guidance of the guide means, the fixed blade biasing means of the constant pressure mechanism constantly biases the fixed blade with a constant force toward the center of rotation of the rotary blade. As a result, the blade alignment of the fixed blade and the rotary blade does not require adjustment of the overall distance between the fixed blade and the rotary blade, and it is sufficient to adjust only the overall parallelism of the fixed blade and the rotary blade, so that the blade alignment work does not require high skill on the part of the worker, and proper blade alignment can be achieved with a simple blade alignment work, wear on the edges of the fixed blade and the rotary blade is suppressed, and the continuous usable life of the cutter unit can be extended.

[0016] In addition, the cutter unit and the automatic filling and packaging machine equipped with the cutter unit of the present invention further include a swing support means for swingably supporting a fixed blade support plate to which a plate-shaped spacer having two fixed blades attached is fixed, a swing drive means for swinging the fixed blade support plate between a position where one of the two fixed blades is in sliding contact with the rotating rotary blade and a position where the other of the two fixed blades is in sliding contact with the rotating rotary blade; Preferably, the blade selection mechanism has a fixed blade selection mechanism having a

[0017] According to this fixed blade selection mechanism, the two fixed blades are fixed to the fixed blade support plate by a plate-shaped spacer, and come into sliding contact with the rotating blade separately as they are oscillated by the oscillating drive means. Therefore, if the two fixed blades are perforation blades and full-cut blades, they can be switched easily and quickly, achieving space-saving and low-cost with a simple configuration, making blade alignment easy, and maintaining the quality and productivity of packaging bags. Furthermore, if the two fixed blades are both perforation blades, full-cut blades or gather blades, wear on the blade tips can be suppressed by easy and appropriate blade alignment, and by switching between the two fixed blades according to the wear on the blade tips, the frequency of blade alignment can be reduced.

[0018] In the cutter unit of the present invention and the automatic filling and packaging machine equipped therewith, it is preferable that the rotary blade has a convex curved slope along the cutting edge, and the cutting edge has a cylindrical polished surface having a width of 0.5 mm or less, particularly 0.2 mm or less, centered on the center of rotation of the rotary blade. With this rotary blade, the tip of the cutting edge becomes a thin, uniform, cylindrical, smooth surface, which reduces the contact surface with the film, thereby preventing whisker-like plastic waste from forming on the cut surface of the packaging bag, and maintaining the quality and productivity of the packaging bag. [Brief description of the drawings]

[0019] [Figure 1] 1A and 1B are a side view and a front view showing an automatic filling and packaging machine according to one embodiment of the present invention, which is equipped with a cutter unit according to one embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged perspective view of the cutter unit according to the embodiment, as viewed obliquely from above. [Diagram 3] FIG. 2 is an enlarged perspective view of the cutter unit of the embodiment as viewed obliquely from below. [Figure 4] 4 is an enlarged cross-sectional view showing a widthwise center portion of the cutter unit of the embodiment as viewed from the side. FIG. [Diagram 5] 5(a) to 5(g) are explanatory views showing in detail improved parts of the cutter unit of the above embodiment. [Figure 6] 13(a) and 13(b) are a side view and a front view showing an automatic filling and packaging machine according to another embodiment of the present invention, which is equipped with the cutter unit of the above embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Here, Fig. 1(a) and Fig. 1(b) are a side view and a front view showing an automatic filling and packaging machine according to an embodiment of the present invention, which is equipped with a cutter unit according to an embodiment of the present invention.

[0021] The automatic filling and packaging machine of the above embodiment, designated by the symbol 1 in the figures, forms a continuous bag SS in which multiple packaging bags S in the form of three-sided sealed bags filled with the packaged material are connected in a belt-like shape, and is equipped with a film folding unit 3, a packaged material filling unit 4, a vertical sealing unit 5, a first horizontal sealing unit 6, a second horizontal sealing unit 7, and a cutter unit 8 of the above embodiment, arranged from top to bottom in the order described, on the front of a thick, plate-like vertical frame 2 standing on a base, and each is fixed to the vertical frame 2.

[0022] Here, the film folding unit 3 folds a soft, strip-shaped laminated film W, which is made of at least a base film layer and a sealant layer, both of which are made of resin films, from the original roll R supported at a lateral position of the frame 2 on the base and sent downward from the top to the bottom of the automatic filling and packaging machine 1, at the center in the width direction so that the sealant layers face each other, and overlaps both side ends to form a double layer.

[0023] The vertical sealing unit 5 sandwiches the strip-shaped laminated film W between a pair of vertical sealing rolls that are arranged horizontally parallel to each other and rotate in opposite directions, and sends it downward while continuously heating it, thereby forming vertical seals by heat sealing along the overlapping side edges of the laminated film W to form a cylindrical shape.

[0024] The first horizontal sealing unit 6 sandwiches the cylindrical laminated film W between a pair of horizontal sealing rolls that are arranged horizontally parallel to each other and rotate in opposite directions, and sends it downward while intermittently heating it, thereby forming horizontal seal portions by heat sealing across the entire width of the stacked laminated films, leaving gaps along the longitudinal direction of the stacked laminated films.

[0025] The second horizontal sealing unit 7 feeds the laminated film W, on which the first horizontal sealing unit 6 has formed the horizontal seal portion, downward while intermittently cooling it with a pair of horizontal sealing rolls that are arranged horizontally parallel to each other and rotate in opposite directions, thereby reinforcing the heat seal of the horizontal seal portion across the entire width of the overlapped laminated film, leaving gaps along the longitudinal direction of the overlapped laminated film.

[0026] The product filling unit 4 fills the gap between the two layers of laminate film above the lower horizontal seal between the lower and upper horizontal seals of two horizontal seals formed with a gap between them, with the product to be packaged filling the gap. This forms a continuous bag SS in which multiple packaging bags S filled with the product are connected in a belt-like shape, and the continuous bag SS is sent from the second horizontal seal unit 7 to the cutter unit 8 below.

[0027] Figures 2 and 3 are enlarged perspective views of the cutter unit 8 of the above embodiment, as viewed diagonally from above and below, respectively, and Figure 4 is an enlarged cross-sectional view of the widthwise center of the cutter unit 8 of the above embodiment, as viewed from the side. The cutter unit 8 in the above embodiment is equipped with a fixed blade 10 and a rotating blade 11 that face each other horizontally, and by rotating the rotary blade 11, the blade tips of the fixed blade 10 and the rotary blade 11 are brought into sliding contact with each other to clamp a continuous package bag SS in which multiple packaging bags S filled with the packaged item are connected in a strip-like shape as the target object, and cut it into individual or multiple packaging bags S, or form cutting perforations between each packaging bag S in the continuous package bag SS.The cutter unit 8 is equipped with a constant pressure mechanism 15 that supports the fixed blade 10 so that it can move back and forth relative to the rotation center C of the rotary blade 11, and has guide means for guiding the forward and backward movement of the fixed blade 10, such as a guide rod 12 and a slider 13 that are slidably fitted together in the axial direction, and fixed blade biasing means, such as two sets of coil springs 14, that constantly biases the fixed blade 10 with a constant force toward the rotation center C of the rotary blade 11 under the guidance of the guide rod 12 and slider 13.

[0028] Furthermore, the cutter unit 8 of this embodiment is equipped with a fixed blade selection mechanism 21 having an approximately U-shaped fixed blade support frame 19 as a swing support means that swingably supports a fixed blade support plate 17, to which the base end of a plate-shaped spacer 16 having two fixed blades 10a, 10b attached, for example, to both sides, is fixed, near the base end of the spacer 16 via a fixed blade support shaft 18, and an air cylinder 20 as a swing drive means that swings the fixed blade support plate 17 between the position shown in Figures 2 to 4 where one 10a of the two fixed blades 10 slides against the rotating rotary blade 11, which is determined by abutment against a stopper pin 27 that specifies the swing limit position, and a position not shown where the other 10b of the two fixed blades 10 slides against the rotating rotary blade 11.

[0029] The rotary blade 11 is supported by a U-shaped base frame 22 so as to be rotatable about a rotation center C, and is rotated by a motor (not shown), and the base frame 22 is fixed to the vertical frame 2 at a position below the second horizontal sealing unit 7. The slider 13 is fixedly supported by the base frame 22, and the forward limit position of the fixed blade 10, with which the cutting edge 11d of the rotary blade 11 slides, is determined by the abutment between the fixed blade support frame 19 and the base frame 22.

[0030] Furthermore, the cutter unit of this embodiment has been improved as shown in detail in Figures 5(a) to (g), and as shown in Figure 5(a), the blade angle of the fixed blade 10 is set to 20° or less with respect to the conveying direction of the continuous package bag SS (the vertical direction in the figure). This has eliminated the conveying failure that occurred when the continuous package bag SS was momentarily blocked by the blade of the fixed blade 10 immediately after the packaging bag S was cut.

[0031] In Fig. 5(b), the rake face 11c on the lower side of the rotary blade 11 is surface ground so that the rake angle of the rake face 11c on the lower side of the rotary blade 11 is 45° or more with respect to the lower surface of the rotary blade 11. This makes it difficult for the perforation blade to bite into the film when cutting the aluminum foil or aluminum-deposited laminated film along the perforations, and prevents the cutting part from rolling up due to the bite, which affects the separation quality of the chain bag (how well the perforations are separated).

[0032] In Fig. 5(c), in order to suppress the shaking of the chain bag SS, a roughly cylindrical press plate 24 is provided below the rotary blade 11. This allows the chain bag SS to abut against the outer circumferential surface of the press plate 24, and prevents the bulging portion of the packaging bag S from contacting the rotary blade 11 before cutting, thereby preventing the packaging bag S from being scratched. Also, a gutter-shaped guide plate 25 is provided below the fixed blade 10 to guide the falling direction of the packaging bag S.

[0033] In Fig. 5(d), the cutting edges of the rotary blade 11 and fixed blade 10 (10a, 10b) (cutting edge 11d of the rotary blade 11) are cylindrically ground to a width of 0.5 mm or less, preferably 0.2 mm or less, to form ground surface 11b. This forms a thin, uniformly smooth surface at the top of the rotary blade 11, reducing the contact surface with the film and suppressing the generation of plastic waste. In addition, since the top of the rotary blade 11 is ground in advance, cutting edge 11d is less susceptible to initial wear (it is already in a good condition, having been "broken in" even before it is used).

[0034] In Fig. 5(e), as shown at the left end, the initially flat slope 11a of the rotary blade 11 is wire-cut into a convex curved surface along the cutting edge 11d as shown in the center, and then, as shown at the right end, the entire top surface of the rotary blade 11 is cylindrically ground around the rotation center C of the rotary blade 11 to form the ground surface 11b. This makes it possible to make the width of the ground surface 11b thin and uniform (0.5 mm or less, preferably 0.2 mm or less) and to make the rotational path of the cutting edge 11d a cylindrical path, as shown in Fig. 5(f) and Fig. 5(g).

[0035] As shown in Figure 3, the fixed blade support frame 19 is screwed onto the tip of the piston rod of each of two air cylinders 26 provided on the base frame 22 along with the two sliders 13, and two sets of coil springs 14 are attached around two shoulder bolts that loosely pass through the bolt holes of the fixed blade support frame 19. The fixed blade support frame 19 is pressed against the tip of the piston rod of each of the two air cylinders 26 by the biasing force of these coil springs 14. As a result, when excessive force is applied to the fixed blade 10 in a direction away from the rotating blade 11, the coil springs 14 are compressed, allowing the fixed blade support frame 19 to escape away from the tip of each piston rod of the air cylinders 26. On the other hand, if the piston rods of the two air cylinders 26 are advanced, the fixed blade 10 can be separated significantly from the rotating blade 11, making it easy to insert the laminated film W between them.

[0036] Figures 6(a) and 6(b) are a side view and a front view showing an automatic filling and packaging machine of another embodiment of the present invention which has the cutter unit of the above embodiment. The automatic filling and packaging machine of this embodiment has basically the same configuration as the previous automatic filling and packaging machine 1, except that it has two cutter units 8, 9 similar to the cutter unit 8 of the above embodiment lined up one above the other, and therefore in Figure 6, parts which are the same as those of the previous embodiment are indicated by the same symbols.

[0037] Because the automatic filling and packaging machine 1 of this embodiment is equipped with two cutter units 8, 9, the manufacturing cost is higher than that of the automatic filling and packaging machine 1 of the previous embodiment, but it is possible to install a perforation blade, a full-cut blade and a gathering blade as the fixed blades 10 of the two cutter units 8, 9, either alone or in various combinations.

[0038] When fixed blades 10 of two cutter units 8, 9 are of different types, for example, a full-cut blade and a perforation blade, the cutting mode can be switched with one touch by swinging the fixed blade 10, and the blades of the cutter units 8, 9 can be easily aligned.

[0039] When the fixed blades 10 of the two cutter units 8, 9 are of the same type, for example, a full-cut blade and a full-cut blade, a perforation blade and a perforation blade, or a gathering blade and a gathering blade, the life of the cutter units 8, 9 can be doubled by swinging and switching the fixed blades 10, and the blade alignment of each cutter unit 8, 9 can be easily performed.

[0040] When the two cutter units 8, 9 are each equipped with a single type of fixed blade 10, such as a full-cut blade, a perforation blade, or a gathering blade, the fixed blade selection mechanism 21 for swinging the fixed blade 10 becomes unnecessary. In that case, the manufacturing cost can be reduced by removing the air cylinder 20 as the swing drive means and leaving the constant pressure mechanism 15 that supports the fixed blade support frame 19 so that it can move back and forth and biases it with a predetermined force, and the features other than the fixed blade selection mechanism 21 (such as the constant pressure mechanism 15) can provide beneficial effects.

[0041] The above has been explained based on the illustrated examples, but the cutter unit and automatic filling and packaging machine of the present invention are not limited to the above-mentioned embodiments and can be modified as appropriate within the scope of the claims. For example, this includes a case in which a single perforation blade is attached as the fixed blade 10 of the cutter unit 8 and a single full-cut blade is attached as the fixed blade 10 of the cutter unit 9, a case in which a full-cut blade and a perforation blade are attached in combination as the fixed blade 10 of the cutter unit 8 and a single gathering blade is attached as the fixed blade 10 of the cutter unit 9, or a case in which the same type of fixed blade 10 of the cutter unit 8, such as a perforation blade and a perforation blade, is attached in combination as the fixed blade 10 of the cutter unit 9 and another similar type of fixed blade 10, such as a full-cut blade and a full-cut blade, is attached in combination. These configurations have the effect of providing high durability and a long life.

[0042] Furthermore, the cutter unit of the present invention is not limited to cutting continuous bags made of packaging bags in a strip-like shape, but can also be widely used to cut objects made of strip-like materials such as plastic film, paper, and thin-film metal. [Industrial Applicability]

[0043] Thus, according to the cutter unit of the present invention and the automatic filling and packaging machine of the present invention equipped with the same, the guide means of the constant pressure mechanism supports the fixed blade so that it can move back and forth relative to the center of rotation of the rotary blade and guides the movement of the fixed blade back and forth, and under the guidance of the guide means, the fixed blade biasing means of the constant pressure mechanism constantly biases the fixed blade toward the center of rotation of the rotary blade with a constant force. As a result, the blade alignment of the fixed blade and the rotary blade does not require adjustment of the overall distance between the fixed blade and the rotary blade, and it is sufficient to adjust only the overall parallelism of the fixed blade and the rotary blade, so that the blade alignment work does not require high skill on the part of the worker, and proper blade alignment can be achieved with a simple blade alignment work, wear on the edges of the fixed blade and the rotary blade is suppressed, and the continuous usable life of the cutter unit can be extended. [Explanation of symbols]

[0044] 1 Automatic filling packaging machine 2 Vertical Frame 3 Film folding unit 4. Packaging filling unit 5 Vertical seal unit 6 First horizontal seal unit 7 Second horizontal seal unit 8 Cutter unit, 1st cutter unit 9 Second cutter unit 10,10a,10b fixed blade 11 Rotary blade 11a Slope 11b Polished surface 11c Scooping face 11d Cutting edge 12 Guide rod 13 Slider 14 Coil spring 15 Constant pressure mechanism 16 Spacer 17 Fixed blade support plate 18 Fixed blade support shaft 19 Fixed blade support frame 20 Air Cylinder 21 Fixed blade selection mechanism 22 Base Frame 23,25 Guide plate 24 Push Plate 26 Air Cylinder 27 Stopper pin C Rotation center R Original roll W laminated film S packaging bag SS continuous bag

Claims

1. A cutter unit has one or two fixed blades and a rotary blade, each of which is a full-cut blade, a perforation blade, or a gathering blade, facing each other, and cuts an object or forms a perforation for cutting in the object by bringing the cutting edge of the fixed blade and the cutting edge of the rotary blade into sliding contact with each other by rotation of the rotary blade, a guide means for supporting the fixed blade so as to be movable back and forth relative to a rotation center of the rotary blade and for guiding the forward and backward movement of the fixed blade; a fixed blade biasing means for constantly biasing the fixed blade with a constant force toward the center of rotation of the rotary blade under guidance by the guide means; A cutter unit comprising a constant pressure mechanism having a pressure adjusting mechanism.

2. a swing support means for swingably supporting a fixed blade support plate to which a plate-shaped spacer having two fixed blades attached is fixed; a swing drive means for swinging the fixed blade support plate between a position where one of the two fixed blades is in sliding contact with the rotating rotary blade and a position where the other of the two fixed blades is in sliding contact with the rotating rotary blade; 2. The cutter unit according to claim 1, further comprising a fixed blade selection mechanism having a blade selector.

3. 2. The cutter unit according to claim 1, wherein the rotary blade has a slope that forms a convex curved surface along the cutting edge, and the cutting edge is a thin polished surface that forms a cylindrical shape centered on the center of rotation of the rotary blade.

4. 4. A cutter unit according to claim 3, wherein the narrow abrasive surface has a width of 0.5 mm or less.

5. a vertical seal unit that sandwiches a soft, strip-shaped laminated film, which is made of at least a base film layer and a sealant layer, both of which are made of resin films, between a pair of vertical seal rolls that are arranged horizontally in parallel to each other and rotate in opposite directions, continuously heats the laminated film, and sends it downward to form vertical seals by heat sealing along the overlapped side edges of the laminated film, thereby forming a tubular film; a horizontal seal unit in which the tubular film is sandwiched between a pair of horizontal seal rolls arranged parallel to each other in the horizontal direction and rotating in opposite directions, and heated intermittently, or sandwiched between two pairs of horizontal seal rolls, and fed downward while being intermittently heated and cooled, thereby forming horizontal seal portions by heat sealing over the entire width of the stacked laminated film at intervals along the longitudinal direction of the stacked laminated film; A packaging material filling unit fills a gap between the two laminated films on the upper side of the lower horizontal seal portion between the lower horizontal seal portion and the upper horizontal seal portion of the two horizontal seal portions formed at an interval above and below; In an automatic filling and packaging machine for forming a continuous bag in which a plurality of packaging bags filled with a packaged article are connected in a belt shape, 2. An automatic filling and packaging machine comprising the cutter unit according to claim 1 below said horizontal sealing unit.

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