JP2016216085A - Top seal device, packaging machine and method for manufacturing packaging body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate opening a packaging body.SOLUTION: A top seal device 100 includes: a cutter blade 192 which is extended to a second direction and advances and withdraws to a packaging film YA1 when sealing and cutting the packaging film YA1 continuing to a first direction to the second direction orthogonal to the first direction so as to make a packaging body; an upstream sealer 120 and a downstream sealer 130 which are arranged on both sides of the cutter blade 192, and pinch the packaging film by a pair of seal bodies, respectively so as to seal to the second direction; and displacement mechanisms 140 and 180 which separate the upstream sealer 120 and the downstream sealer 130 to the first direction after the upstream sealer 120 and the downstream sealer 130 contact the packaging film YA1, and before the cutter blade 192 withdraws upon cutting the packaging film YA1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a top seal device that seals and cuts a packaging film, a packaging machine including the top seal device, and the like.

  In a packaging machine that pillow-wraps articles such as foods and daily necessities, articles are supplied one after another to the packaging machine, and these articles are individually pillow-wrapped by a packaging film to produce a package.

  The packaging machine includes a bag making machine, a center seal device, a top seal device, and the like. In the bag making machine, the packaging film is sequentially fed out from the raw fabric and continuously supplied in accordance with the sequential supply of articles, and the packaging film is formed into a cylindrical shape. In the center seal device, the packaging film is formed into a cylindrical shape, and both end edges in the width direction (center seal portion) overlapped with each other are heated by being sandwiched between a pair of bar sealers and pressurized with a press roller, (Vertical seal) is performed. In the top seal device, in order to ensure the hermeticity of the package, a top seal (lateral seal) is performed in the width direction of the packaging film that becomes a cylindrical shape at every pitch according to the length of the article. Cuts are made parallel to the top seal to produce a package. The top seal device is sometimes called an end seal device.

  A conventional top seal device has a pair of sealers that are arranged on both sides of a cylindrical packaging film to perform end sealing, a drive device that drives the pair of sealers to approach and separate, and a sealer independently. It has a cutter blade that approaches and separates from the packaging film. The pair of sealers are heated by a built-in heater, and end seal by sandwiching the packaging film. The cutter blade approaches the vicinity of the end seal of the packaging film and cuts the packaging film to form individual packaging bodies. This cutter blade is generally cut by pressing a sharp blade edge against a packaging film. (See Patent Document 1)

Japanese Patent No. 5306737

  In the top seal device of Patent Document 1, for example, as shown in FIGS. 12A and 12B, while sandwiching the film with a sealer, the thick cutter blade is pushed down, and the film is cut while being separated. The vicinity of the cutting surface TOL of the top seal portion TO1 is in an unsealed state, and further bent downward while rubbing against the descending cutter blade, so that the two films near the cutting surface TOL are displaced from each other. Further, as shown in FIG. 11C, when the cutter blade is retracted upward, one of the two films in the vicinity of the cutting surface TOL opens upward (turns up). As a result, there existed a problem that the beauty | look of the top seal part TO1 in a package deteriorated. This phenomenon was particularly noticeable when the film was an aluminum packaging material.

  Further, as shown in FIG. 12A, for example, when the top seal portion TO1 is slack, there is a problem that wrinkles are likely to occur in a portion sandwiched between a pair of sealers.

  Further, as shown in FIG. 13A, when the cutter blade is a single blade, a portion corresponding to the thickness of the cutter blade in the cut packaging film remains on the tapered surface (grind surface) side of the single blade. Accordingly, as shown in FIG. 13B, the vicinity of the cut surface TOL on the tapered surface side of the top seal portion TO1 bends downward while rubbing against the descending cutter blade, and thereafter, as shown in FIG. 13C. When the cutter blade is retracted upward, one of the two films in the vicinity of the cut surface TOL on the tapered surface side opens upward (turns up).

  In addition, a sealant layer may be formed on the inner peripheral surface of the tubular film to enhance the adhesion between them. At the time of cutting, the cutter blade and the sealant layer of the film rub against each other. There was a problem that it adhered to the blade and had to be cleaned regularly.

  This invention is made | formed in view of the said subject, and it aims at providing the top seal apparatus etc. which can improve the beauty | look of the top seal part of a package body, and can reduce the maintenance frequency of a cutter blade.

  (1) The present invention is a top seal device in which a packaging film continuous in a first direction is sealed and cut in a second direction perpendicular to the first direction to form a package, which extends in the second direction. A cutter blade that advances and retreats toward the packaging film to cut the packaging film, and is disposed on both sides of the cutter blade in the first direction, each pinching the packaging film in the second direction. The upstream sealer and the downstream sealer that seal in a band shape, and after the upstream sealer and the downstream sealer contact the packaging film, and before the cutter blade that cuts the packaging film moves backward, the upstream sealer A top seal device comprising: a side sealer; and a displacement mechanism that separates the downstream sealer in the first direction.

  (2) In the present invention, it is also preferable that the displacement mechanism includes the upstream sealer after the upstream sealer and the downstream sealer are in contact with the packaging film and before the cutter blade cuts the packaging film. The top seal device according to (1), wherein the downstream sealer is separated in the first direction.

  (3) In the present invention, the displacement mechanism may include the upstream sealer and the downstream after the cutter blade cuts the packaging film and before the cutter blade that cut the packaging film moves backward. The top seal device according to (1) above, wherein the side sealer is separated in the first direction.

  (4) In the present invention, the upstream side sealer and the downstream side sealer each include a pair of seal bodies for sandwiching the packaging film, and the displacement mechanism includes the seal body and the first seal body. The top seal device according to any one of (1) to (3) above, wherein the top seal device has a swing shaft that swings in one direction.

  (5) In the present invention, the upstream sealer and the downstream sealer each include a pair of seal bodies for sandwiching the packaging film, and the pair of seal bodies includes the packaging film and the sealing film. A pair of belt-shaped seal surfaces that contact each other, and the displacement mechanism includes an inclined position where the pair of belt-shaped seal surfaces are inclined toward the cutter blade side with respect to the first direction, and the pair of belt-shaped seal surfaces. The pair of seal bodies of at least one of the upstream sealer and the downstream sealer are angularly displaced so that a seal surface transitions between parallel positions parallel to the first direction. The top seal device according to any one of (1) to (4) above.

  (6) The present invention is also such that the displacement mechanism is in the inclined position when the seal body contacts the packaging film, and in the parallel position when the cutter blade cuts the packaging film. The top seal device according to (5), wherein the pair of seal bodies are angularly displaced.

  (7) The present invention is also characterized in that the displacement mechanism has urging means for urging the upstream sealer and the downstream sealer to approach each other. It is a top seal apparatus in any one.

  (8) The present invention is also characterized in that the displacement mechanism includes a slider that slides at least one of the upstream sealer and the downstream sealer in the first direction. The top seal device according to any one of the above.

  (9) The present invention is also characterized in that the displacement mechanism separates the upstream side sealer and the downstream side sealer by using a clamping pressure of the packaging film by the upstream side sealer or the downstream side sealer. The top seal device according to any one of (1) to (8) above.

  (10) The present invention is also characterized in that the displacement mechanism has first direction interlocking means for interlocking the displacement of the upstream sealer and the displacement of the downstream sealer. The top seal device according to any one of the above.

  (11) In the present invention, the upstream sealer and the downstream sealer each include a pair of seal bodies for sandwiching the packaging film, and the displacement mechanism includes the upstream sealer and the upstream sealer. The top seal device according to any one of (1) to (10) above, further comprising seal direction interlocking means for interlocking displacement of the pair of seal bodies in at least one of the downstream sealers.

  (12) In the invention, any one of the above (1) to (11), wherein a separation distance in the first direction in the displacement mechanism is set to be equal to or greater than a thickness of the cutter blade. It is a top seal apparatus of description.

  (13) In the present invention, the cutter blade is a single blade, and the displacement mechanism separates the one located on the taper surface side of the single blade in the upstream sealer and the downstream sealer in the first direction. The top seal device according to any one of (1) to (12) above.

  (14) The present invention includes a supply device that supplies a packaging film, a bag making device that forms the tubular film by bending the packaging film supplied from the supply device in a width direction, and a downstream of the bag making device. 14. A center seal device that performs center sealing on the packaging film formed in a cylindrical shape, and seals and cuts in the width direction at predetermined intervals with respect to the center sealed packaging film. A top seal device according to claim 1.

  (15) The present invention is a packaging body manufacturing method in which a packaging film continuous in a first direction is sealed and cut in a second direction perpendicular to the first direction to form a packaging body. After the upstream sealer and the downstream sealer disposed on both sides in the first direction come into contact with the packaging film, and before the packaging film is cut by the cutter blade, the upstream sealer and the downstream sealer The packaging film is tensioned by separating the distance in the first direction, sealed in the second direction by the upstream sealer and the downstream sealer, and the tension is imparted in the first direction. It is the package manufacturing method characterized by cut | disconnecting the said packaging film of the state with the said cutter blade.

  According to the present invention, the appearance of the top seal portion of the package can be enhanced, and the maintenance frequency of the cutter blade can be reduced.

It is the schematic of the packaging machine which concerns on 1st embodiment of this invention. It is an external appearance perspective view of a package. Regarding the top seal device employed in the packaging machine, (A) is a front view of the first seal unit and the second seal unit in a separated state, and (B) is a state in which the first seal unit and the second seal unit are in close proximity. FIG. Regarding the top seal device, (A) is a side sectional view in which the first seal unit and the second seal unit are separated from each other, and (B) is a side sectional view in which the first seal unit and the second seal unit are in close proximity. is there. Regarding the top seal device, (A) is an enlarged side sectional view of the first seal unit and the second seal unit separated from each other, and (B) is an enlarged side sectional view of the first seal unit and the second seal unit in an approaching state. FIG. Regarding the top seal device, (A) is a side enlarged sectional view of the sealed state of the first seal unit and the second seal unit, and (B) is a side enlarged sectional view of the state in which the packaging film is cut by the cutter unit. (A) thru | or (D) is an expanded sectional view which shows the procedure which seals and cut | disconnects a packaging film with the same top seal apparatus. Regarding the top seal device according to the second embodiment of the present invention, (A) is a side sectional view of the first seal unit and the second seal unit separated from each other, and (B) is the first seal unit and the second seal unit. Is a side sectional view of the approaching state. Regarding the top seal device according to the third embodiment of the present invention, (A) is a side sectional view of the first seal unit and the second seal unit separated from each other, and (B) is the first seal unit and the second seal unit. Is a side sectional view of the approaching state. Regarding the top seal device according to the fourth embodiment of the present invention, (A) is a side sectional view in which the first seal unit and the second seal unit are separated from each other, and (B) is the first seal unit and the second seal unit. Is a side sectional view of the approaching state. (A) thru | or (E) is an expanded sectional view which shows the procedure which seals and cut | disconnects a packaging film with the top seal apparatus used as the application example of embodiment of this invention. (A) thru | or (D) is an expanded sectional view which shows the procedure which seals and cut | disconnects a packaging film with the conventional top seal apparatus used as a double-edged blade. (A) thru | or (D) is an expanded sectional view which shows the procedure which seals and cut | disconnects a packaging film with the conventional top seal apparatus used as a single blade.

  Hereinafter, the configuration of the packaging machine 1 according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of the packaging machine 1. In addition, in this figure and each subsequent figure, one part structure is abbreviate | omitted suitably and drawing is simplified. And in this figure and each subsequent figure, the magnitude | size, shape, thickness, etc. of a member are exaggerated suitably and expressed.

  The packaging machine 1 shown in FIG. 1 is used in a line for sequentially packaging articles XA1 such as food and daily necessities with a packaging film YA1. The packaging machine 1 includes an article supply device 2, a film supply device 3, a packaging machine body 4, a control unit (not shown), and the like.

  Each part of the packaging machine 1 is centrally controlled by the control unit. The control unit includes a CPU, a RAM, a ROM, and the like, and executes various controls. The CPU is a so-called central processing unit, and various programs are executed to realize various functions. The RAM is used as a work area for the CPU. The ROM stores a basic OS and programs executed by the CPU.

  The article supply device 2 conveys the article XA1 at regular intervals and sequentially conveys the article XA1 to the downstream packaging machine body 4. This article supply apparatus 2 is configured by a finger conveyor. Specifically, the article supply device 2 includes a conveyance surface (not shown) having a slit, a side guide (not shown) for guiding the article XA1 on the conveyance surface from the side, a driving sprocket 5, and a driven member. Sprockets (not shown), an annular chain 6 running over the sprockets, a plurality of fingers 7 attached to the chain 6 at equal intervals, and a servo motor (not shown) as a power source (Omitted).

  The drive sprocket 5 is rotated by the drive of the servo motor. The driven sprocket rotates in conjunction with the driving sprocket as the chain 6 travels. The chain 6 travels so as to circulate by the rotation of the driving sprocket 5. The plurality of fingers 7 protrude upward from below the conveyance surface via the slits. The plurality of fingers 7 travel on the conveying surface by the travel of the chain 6. Accordingly, the plurality of fingers 7 push the article XA1 on the transport surface and send it out to the packaging machine body 4.

  The film supply device 3 continuously supplies the packaging film YA1 to the downstream packaging machine body 4. The film supply device 3 includes an original fabric shaft 8, a servo motor (not shown), guide rollers 9a and 9b, and the like. The original fabric shaft 8 holds the original fabric roll YB1 rotatably. The original fabric shaft 8 rotates when power is applied to the servo motor, and rotates the original fabric roll YB1 being held. Thereby, the packaging film YA1 is fed out (stretched) from the original fabric roll YB1. The guide rollers 9a and 9b appropriately change the transport direction of the raw fabric roll YB1 and guide it to the packaging machine body 4 side.

  In addition, as a method of feeding out the packaging film YA1 from the original fabric roll YB1, instead of adopting the original fabric driving method as described above, a feed roller is separately provided, and the feed roller is moved to draw out the packaging film YA1. A driving method may be adopted.

  The packaging machine body 4 wraps the article XA1 supplied from the article supply device 2 with the packaging film YA1 supplied from the film supply device 3. Specifically, the packaging machine body 4 includes a bag making device 14, a pinch roller 15, a center seal device 16, a first transport device 17, an upper holding device 18, and a top seal device (end seal device) 100. And a second transfer device 20.

  The bag making device 14 forms the packaging film YA1 supplied from the film supply device 3 into a cylindrical shape so that both end edges in the width direction overlap each other. In addition, the bag making device 14 supplies the article XA1 supplied from the article supply device 2 to the packaging film YA1 that is manufactured in a cylindrical shape. As a result, the article XA1 is wrapped in the packaging film YA1 formed into a cylindrical shape. That is, the bag making device 14 functions as a bag making device that forms the tubular film by bending the packaging film YA1 in the width direction.

  The pinch roller 15 sandwiches both end edges of the packaging film YA1 that overlap each other (hereinafter referred to as a center seal portion CE1 (see FIG. 2)), and applies a conveying force to the center seal portion CE1.

  The center seal device 16 includes a pair of bar sealers 16a and a press roller 16b. The center seal device 16 heats the center seal portion sandwiched between a pair of bar sealers 16a. The center seal device 16 performs center sealing by pressing the heated center seal portion with the press roller 16b. That is, the center seal device 16 performs center seal on the packaging film YA1 formed in a cylindrical shape downstream of the bag making device 14. Note that a rotary center seal device that heats the center seal portion with a pair of rollers or a plurality of rollers may be used.

  The first transport device 17 transports the center-sealed cylindrical packaging film YA1 along with the article XA1 wrapped in the packaging film YA1 on the transport surface (reference numeral omitted) toward the top seal device 100. . The first transport device 17 expands and contracts the transport surface in the transport direction in accordance with the box motion of the top seal device 100. In addition to the box motion, a rotary or linear reciprocating top seal device may be used.

  The upper restraining device 18 is disposed above the first transport device 17 and restrains the article XA1 transported to the first transport device 17 from above with the packaging film YA1. Thereby, the article XA1 is conveyed while maintaining the horizontal state.

  The top seal device 100 performs a top seal (end seal, lateral seal) and cut in the width direction of the packaging film YA1 for each pitch according to the length of the article XA1. Thereby, package ZA1 (refer FIG. 2) is manufactured. That is, the top sealing device 100 performs sealing and cutting in the width direction at a predetermined interval on the center-sealed packaging film YA1.

  As shown in FIGS. 3 (A) and 4 (A), the top seal device 100 has a first seal unit 110 disposed on the upper side and a second seal unit 150 disposed on the lower side, and these are moved relative to each other. And a cutter unit 190 installed in the first seal unit 110. The first seal unit 110 and the second seal unit 150 are arranged so as to face both sides of the packaging film YA1, and are moved toward and away from each other by the displacement mechanism 198.

  This approach / separation operation can be moved by, for example, a movement trajectory of box motion. Specifically, while the first seal unit 110 and the second seal unit 150 approach and sandwich the packaging film YA1, and move from the upstream to the downstream by a predetermined distance so as to follow the conveyance direction of the packaging film YA1. Sealing is performed, and in the meantime, the packaging film YA1 is cut by the cutter unit 190. Thereafter, the first seal unit 110 and the second seal unit 150 are separated from the packaging film YA1, and further moved from the downstream to the upstream by a predetermined distance to return to the original positions. By repeating these operations, the packaging film YA1 is repeatedly sealed and cut.

  The first seal unit 110 includes a first base 112, a first fixing base 114 disposed on the packaging film YA1 side with respect to the first base 112, and a first upstream held by the first fixing base 114. It has the 1st displacement mechanism 140 provided in the 1st fixing stand 114, and the side seal body 122 and the 1st downstream seal body 132. The first fixing base 114 is disposed on the first base 112 via a slidable slide shaft 114A. The first fixing base 114 is perpendicular to the surface of the packaging film YA1 with respect to the first base 112, that is, the second seal unit. 150 can be moved back and forth in the direction of approaching and moving away from 150. The first fixing base 114 is always urged toward the packaging film YA1 with respect to the first base 112 by an urging member 114B such as a compression spring or an air spring using an air cylinder.

  The second seal unit 150 includes a second base 152, a second fixing base 154 disposed on the packaging film YA1 side with respect to the second base 152, and a second upstream held by the second fixing base 154. A side seal body 162 and a second downstream side seal body 172 and a second displacement mechanism 180 provided on the first fixing base 114 are provided.

  The first upstream seal body 122 and the second upstream seal body 162 located upstream from the cutter unit 190 are defined as the upstream sealer 120, and the first downstream located downstream from the cutter unit 190. The side seal body 132 and the second downstream side seal body 172 are defined as the downstream sealer 130.

  As shown in FIGS. 3B and 4B, when the first seal unit 110 and the second seal unit 150 approach each other, the upstream sealer 120 (the first upstream seal body 122 and the second upstream seal). The packaging film YA1 upstream of the cutter unit 190 is sandwiched by the body 162), and the downstream packaging of the cutter unit 190 is achieved by the downstream sealer 130 (the first downstream sealing body 132 and the second downstream sealing body 172). The film YA1 is sandwiched.

  When the first seal unit 110 and the second seal unit 150 further approach, the first upstream seal body 122 and the first downstream seal body 132 of the first seal unit 110 resist the biasing force of the biasing member 114B. Pushed to the first base 112 side, an appropriate clamping force is generated in each of the upstream sealer 120 and the downstream sealer 130. As a result, the upstream side sealer 120 seals the upstream side of the cutter unit 190 of the packaging film YA1 in a strip shape, and the downstream side sealer 130 seals the downstream side of the cutter unit 190 of the packaging film YA1 in a strip shape.

  Next, the detailed structure of the cutter unit 190, the first seal unit 110, and the second seal unit 150 will be described.

  As shown in FIG. 5A, the cutter unit 190 includes a double-edged cutter blade 192, an air cylinder 194 fixed to the first base 112 by a bracket, and a cutter blade provided on the first base 112. It has a guide 196 that guides 192 in the vertical direction. The cutter blade 192 is disposed in the gap between the first upstream seal body 122 and the first downstream seal body 132 and is guided by the guide 196 so as to be movable in the vertical direction. A saw blade-shaped cutting edge 192A (see FIG. 4) is formed on the lower edge of the cutter blade 192. The air cylinder 194 serves as a power source for moving the cutter blade 192 in the vertical direction. Accordingly, when the cutter blade 192 is lowered by the air cylinder 194, the blade edge 192A protrudes below the first upstream seal body 122 and the first downstream seal body 132, and the second upstream seal body 162 and the second downstream seal body are projected. It enters the gap between the side seal bodies 172 and pushes the packaging film YA1.

  The first displacement mechanism 140 includes a first upstream swing shaft 141A provided on the first upstream seal body 122, a first downstream swing shaft 141B provided on the first downstream seal body 132, and a first fixed base 114. A first upstream return spring 142A installed between the first upstream seal body 122 and a first downstream return spring 142B installed between the first fixed base 114 and the first downstream seal body 132. .

  The first upstream swing shaft 141A and the first downstream swing shaft 141B are shafts extending in the width direction of the packaging film YA1, and the first upstream seal body 122 and the first downstream seal body 132 are replaced with the packaging film. It is swung in the transport direction of YA1.

  The first upstream seal body 122 is inclined so that the belt-shaped seal surface 122A extending in the width direction of the packaging film YA1 formed on the first upstream seal body 122 faces the cutter blade 192 side with respect to the packaging film YA1. Transition is made between a state (this is defined as an “inclined position”) and a state in which the strip-shaped sealing surface 122A is parallel to the packaging film YA1 (this is defined as a “parallel position”).

  The first upstream return spring 142A is in a state where no external force is applied to the first upstream seal body 122, that is, in a state where the first upstream seal body 122 is not in contact with the packaging film YA1. Is always energized so as to be in the “inclined position”. This means that the first upstream seal body 122 is urged in a direction to approach the first downstream seal body 132.

  The first downstream seal body 132 is inclined so that the strip-shaped seal surface 132A extending in the width direction of the packaging film YA1 formed on the first downstream seal body 132 faces the cutter blade 192 side with respect to the packaging film YA1. A transition is made between the state and the state in which the belt-shaped seal surface 122A is parallel to the packaging film YA1.

  The first downstream side return spring 142B is in a state where no external force is applied to the first downstream side seal body 132, that is, in a state where the first downstream side seal body 132 is not in contact with the packaging film YA1. Is always energized so as to be in the “inclined position”. This means that the first downstream seal body 132 is urged in a direction to approach the first upstream seal body 122.

  The second displacement mechanism 180 includes a second upstream swing shaft 181A provided on the second upstream seal body 162, a second downstream swing shaft 181B provided on the second downstream seal body 172, and a second fixed base 154. And a second upstream return spring 182A installed between the second upstream seal body 162 and a second downstream return spring 182B installed between the second fixed base 154 and the second downstream seal body 172. .

  The second upstream swing shaft 181A and the second downstream swing shaft 181B are shafts extending in the width direction of the packaging film YA1, and the second upstream seal body 162 and the second downstream seal body 172 are replaced with the packaging film. It is swung in the transport direction of YA1.

  The second upstream seal body 162 is inclined so that the strip-shaped seal surface 162A extending in the width direction of the packaging film YA1 formed on the second upstream seal body 162 faces the cutter blade 192 side with respect to the packaging film YA1. A transition is made between the state and the state in which the belt-like seal surface 162A is parallel to the packaging film YA1.

  The second upstream return spring 182A is always in the “inclined position” in a state where no external force is applied to the second upstream seal body 162, that is, in a state where the second upstream seal body 162 is not in contact with the packaging film YA1. Energize as follows. This means that the second upstream seal body 162 is urged in a direction to approach the second downstream seal body 172.

  The second downstream seal body 172 is inclined such that a strip-shaped seal surface 172A extending in the width direction of the packaging film YA1 formed on the second downstream seal body 172 faces the cutter blade 192 side with respect to the packaging film YA1. A transition is made between the state and the state in which the belt-shaped sealing surface 172A is parallel to the packaging film YA1.

  The second downstream return spring 182B is in a state where no external force is applied to the second downstream seal body 172, that is, in a state where the second downstream seal body 172 is not in contact with the packaging film YA1. Is always energized so as to be in the “inclined position”. This means that the second downstream side seal body 172 is urged in a direction to approach the second upstream side seal body 162.

  The biasing force by the first upstream return spring 142A, the first downstream return spring 142B, the second upstream return spring 182A, and the second downstream return spring 182B is greater than the biasing force of the biasing member 114B that provides the seal pressure. Set sufficiently small. Accordingly, the return springs 142A, 142B, 182A, 182B are preferentially compressed by the urging force of the urging member 114B. When the return springs 142A, 142B, 182A, and 182B are compressed, the back surfaces of the seal bodies 122, 132, 162, and 172 and the seating surfaces of the first fixing base 114 and the second fixing base 154 are swung. (Support surface) abuts, and the seal bodies 122, 132, 162, 172 are positioned in a parallel state. As a result, the urging force of the urging member 114 </ b> B is transmitted to the seal bodies 122, 132, 162, 172 via the first fixed base 114 and the second fixed base 154. When the urging force of the urging member 114B is released, the urging force of the first upstream return spring 142A, the first downstream return spring 142B, the second upstream return spring 182A, and the second downstream return spring 182B is applied. The seal bodies 122, 132, 162, 172 return to the inclined state. In addition, when each belt-shaped sealing surface 122A, 132A, 162A, 172A in the inclined state is viewed from the side, it has a C shape and an inverted C shape.

  Further, the belt-like seal surfaces 122A, 132A, 162A, 172A of the first upstream seal body 122, the first downstream seal body 132, the second upstream seal body 162, and the second downstream seal body 172 are arranged in the width direction. It has a saw-tooth-like unevenness that extends. The belt-like seal surfaces 122A and 162A facing in the up-down direction in the upstream sealer 120 mesh with each other. Similarly, the seal surfaces 132A and 172A facing in the vertical direction in the downstream sealer 130 mesh with each other. Thereby, the sealing eyes by an unevenness | corrugation are formed in top seal part TO1 of packaging film YA1.

  The center of the first upstream swing shaft 141A and the second upstream swing shaft 181A of the upstream sealer 120 is disposed at a position closer to the cutter blade 192 side than the center of the strip seal surfaces 122A, 162A in the transport direction. Is done. In this way, a large moment can be obtained when the belt-like seal surfaces 122A and 162A come into contact with each other and transition from the inclined state to the parallel state, so that the upstream side seal bodies 122 and 162 can be smoothly swung. it can.

  Similarly, the center of the first downstream swing shaft 141B and the second downstream swing shaft 181B of the downstream sealer 130 is closer to the cutter blade 192 side than the center of the strip seal surfaces 132A and 172A in the transport direction. It is arranged. In this way, a large moment can be obtained when the belt-like seal surfaces 132A and 172A contact each other and transition from the inclined state to the parallel state, so that the downstream seal bodies 132 and 172 can be smoothly swung. it can.

  Accordingly, when the first seal unit 110 is lowered in the state of FIG. 5A, the upstream sealer 120 is upstream of the pair of belt-like seal surfaces 122A and 162A that are inclined as shown in FIG. 5B. A side edge contacts the packaging film YA1. Similarly, in the downstream sealer 130, the downstream end edges of the pair of seal surfaces 132A and 172A that are inclined contact the packaging film YA1.

  When the first seal unit 110 is further lowered in the state of FIG. 5B, the second upstream return spring 182A, the second downstream return spring 182B, the first upstream return spring 142A, and the first downstream return spring 142B. Is compressed, and the first upstream seal body 122, the first downstream seal body 132, the second upstream seal body 162, and the second downstream seal body 172 are gradually swung. As a result, in the upstream side sealer 120, the pair of belt-like seal surfaces 122A and 162A gradually transition to a parallel state, so that the packaging film YA1 is sandwiched from the upstream end edge toward the downstream side. Similarly, in the downstream sealer 130, the pair of sealing surfaces 132A and 172A gradually transition to a parallel state, thereby sandwiching the packaging film YA1 from the downstream edge toward the upstream side.

  Finally, as shown in FIG. 6A, the pair of strip seal surfaces 122A, 162A of the upstream sealer 120 are in a parallel state, and the pair of strip seal surfaces 132A, 172A of the downstream sealer 130 are also in a parallel state. Become. At this time, the pair of seal surfaces 122A and 162A of the upstream sealer 120 slightly moves upstream from the cutter unit 190 due to the swinging of the first upstream seal body 122 and the second upstream seal body 162. In addition, the pair of seal surfaces 132A and 172A of the downstream sealer 130 slightly moves from the cutter unit 190 to the downstream side by the swinging of the first downstream seal body 132 and the second downstream seal body 172.

  As a result, the upstream sealer 120 and the downstream sealer 130 are separated from each other, and a tension in the transport direction is applied to the vicinity of the center of the top seal portion TO1 of the packaging film YA1. The separation distance (relative separation distance) between the upstream sealer 120 and the downstream sealer 130 is set to be equal to or greater than the thickness T of the cutter blade 192. The absolute separation distance between the upstream sealer 120 and the downstream sealer 130 is not less than half the thickness of the cutter blade 192 (T / 2 or more) and the pitch P of the unevenness of the belt-like seal surfaces 122A and 162A. It is set to half or less (P / 2 or less). For example, when the thickness T of the cutter blade 192 is 1.0 mm, the upstream side sealer 120 and the downstream side sealer 130 may be separated from each other by an absolute distance of 0.5 mm or more. Further, when the unevenness pitch P is 3.0 mm, the upstream sealer 120 and the downstream sealer 130 may be separated from each other by an absolute distance of 1.5 mm or less. If the moving distance in the transport direction exceeds a half pitch (P / 2), if a failure occurs in the swing of one of the upper and lower seals, the peaks or valleys of the bumps interfere with each other and damage the bumps. This is not desirable because there may be cases.

  The separation limit between the upstream sealer 120 and the downstream sealer 130 is determined by the stopper functions of the first and second fixing bases 114 and 154. In the present embodiment, the first upstream seal body 122, the first downstream seal body 132, the second upstream seal body 162, and the second downstream seal body 172 are respectively the first and second fixing bases 114, 154. Is engaged or abutted with, and further movement is restricted. When the separation limit is reached, it becomes possible to make the sealing load of the urging member 114B stronger than the return springs 142A, 142B, 182A, 182B. In this state, by further lowering the first seal unit 110, the top seal portion TO1 is sealed while sufficiently exerting the clamping force (seal load) by the urging member 114B.

  Thereafter, as shown in FIG. 6B, the cutter blade 192 of the cutter unit 190 is lowered to cut the top seal portion TO1. At this time, as shown in FIG. 7A, the center vicinity of the top seal portion TO1 is pulled at a distance equal to or greater than the thickness T of the cutter blade 192. Therefore, as shown in FIG. Simultaneously with the cutting by 192, the cutting surface TOL of the top seal portion TO1 is separated from the cutter blade 192. Therefore, as shown in FIG. 7C, even if the cutter blade 192 moves up and down in the vicinity of the cutting surface TOL, the friction between the cutting surface TOL and the cutter blade 192 can be reduced. Can be prevented from opening upward or the sealant of the cut surface TOL adheres to the cutter blade 192.

  As described above, according to the packaging machine 1 of the first embodiment, after the four seal bodies 122, 132, 162, 172 contact the packaging film YA1, and before the cutter blade 192 cuts the packaging film YA1, The seal bodies 122 and 162 of the upstream sealer 120 are separated from the seal bodies 132 and 172 of the downstream sealer 130. Therefore, since the packaging film YA1 stretched in the transport direction is cut by the cutter blade 192, the cut is good.

  Further, the cut surface TOL of the packaging film YA1 after cutting is pulled away from the cutter blade 192. As a result, since the contact amount between the cutter blade 192 and the cutting surface TOL can be suppressed, the cutting of the cutting surface TOL can be prevented, and an excellent aesthetic appearance can be achieved. At the same time, since the sealant of the cut surface TOL can be suppressed from adhering to the cutter blade 192, the cleaning frequency can be reduced. Moreover, since tension | tensile_strength is provided to top seal part TO1, generation | occurrence | production of the wrinkle of a seal part can also be suppressed.

  Further, in the top seal device 100, the displacement mechanisms 140, 180 have swing shafts 141A, 141B, 181A, 181B that swing the seal bodies 122, 132, 162, 172 in the transport direction. Therefore, by swinging the seal bodies 122, 132, 162, 172, the seal bodies 122, 162 of the upstream sealer 120 and the seal bodies 132, 172 of the downstream sealer 130 can be separated with a simple configuration.

  In particular, the displacement mechanisms 140 and 180 are parallel to the packaging film YA1 and an inclined position in which the strip-shaped sealing surfaces (122A, 162A) (132A, 172A) paired in the vertical direction face the cutter blade 192 side with respect to the packaging film YA1. Transition between parallel positions. The strip-shaped sealing surfaces (122A, 162A) (132A, 172A) that form a pair in the vertical direction are gradually wrapped from the outer edges of the conveyance direction with respect to the cutter blade 192 toward the cutter blade 192 little by little. Abuts on YA1. At the same time, the belt-like sealing surfaces (122A, 162A) (132A, 172A) move in a direction away from the cutter blade 192. As a result, it is possible to apply tension to the top seal portion TO1 of the packaging film YA1 while sandwiching and sealing the packaging film YA1 little by little with the unevenness of the belt-shaped sealing surfaces (122A, 162A) (132A, 172A). Become.

  Further, the displacement mechanisms 140 and 180 of the top seal device 100 include biasing means (first upstream return spring 142A, first downstream return spring 142B, second upstream return spring 182A, and second downstream return spring 182B. ) To urge the seal bodies 122 and 162 of the upstream sealer 120 and the seal bodies 132 and 172 of the downstream sealer 130 to approach each other. Accordingly, when no external force is applied to the seal bodies 122, 162, 132, 172, the seal bodies 122, 162 of the upstream sealer 120 and the seal bodies 132, 172 of the downstream sealer 130 are automatically brought close to each other. Can do. Further, when a sealing clamping pressure acts on the upstream sealer 120 and the downstream sealer 130, the upstream sealer 120 and the downstream sealer 130 can be separated from each other by using the clamping pressure.

  Further, when the clamping pressure is released after the sealing and cutting of the packaging film YA1 are completed, the strip-shaped sealing surfaces (122A, 162A) (132A, 172A) swing and move away from the place approaching the cutter blade 192. Toward the packaging film YA1 little by little. Accordingly, even when the packaging film YA1 and the strip-shaped seal surfaces (122A, 162A) (132A, 172A) are in close contact with each other by the adhesive of the top seal portion TO1, the strip-shaped seal surfaces (122A, 162A) (132A, 172A) are smooth. Can be pulled apart.

  Next, with reference to FIG. 8, the top seal apparatus 100 of the packaging machine of 2nd embodiment is demonstrated. The other devices, parts, and members excluding a part of the top seal device 100 are the same as or similar to the packaging machine of the first embodiment, and are illustrated by matching the reference numerals as necessary. A part of the description will be omitted, and the description will focus on the differences from the first embodiment.

  As shown in FIG. 8A, in the top seal device 100 of the second embodiment, the first and second displacement mechanisms 140 and 180 include first and second transport direction interlocking means 240 and 280, respectively.

  The first transport direction interlocking means 240 interlocks the displacement of the first upstream seal body 122 and the first downstream seal body 132. That is, only one of the first upstream seal body 122 and the first downstream seal body 132 is restricted from being displaced independently, and both perform the same (or symmetric) operation.

  Specifically, the first transport direction interlocking means 240 includes a first upstream connecting arm 242A that swings together with the first upstream seal body 122, and a first downstream connecting arm 242B that swings together with the first downstream seal body 132. A slide portion 243 disposed near the end of one of the first upstream connecting arm 242A and the first downstream connecting arm 242B (here, the first downstream connecting arm 242B), and the first upstream connecting arm 242A. And a guide portion 244 that is formed in the vicinity of the other end of the first downstream connecting arm 242B (here, the first upstream connecting arm 242A) and guides the slide portion 243 in the longitudinal direction. As shown in FIG. 8B, when the first upstream connecting arm 242A swings, the slide portion 243 is guided along the guide portion 244, and the first downstream connecting arm 242B also swings. Also when the first downstream connecting arm 242B swings, the slide portion 243 is guided along the guide portion 244, and the first upstream connecting arm 242A swings. As a result, the first upstream seal body 122 and the first downstream seal body 132 can always be interlocked.

  The second transport direction interlocking means 280 interlocks the displacement of the second upstream seal body 162 and the second downstream seal body 172. That is, only one of the second upstream seal body 162 and the second downstream seal body 172 is restricted from being displaced independently, and both perform the same (or symmetric) operation.

  Specifically, the second transport direction interlocking means 280 includes a second upstream connecting arm 282A that swings together with the second upstream seal body 162, and a second downstream connecting arm 282B that swings together with the second downstream seal body 172. A slide portion 283 disposed near the end of one of the second upstream connecting arm 282A and the second downstream connecting arm 282B (here, the second downstream connecting arm 282B), and a second upstream connecting arm 282A. And a guide portion 284 that is formed in the vicinity of the other end of the second downstream connecting arm 282B (here, the second upstream connecting arm 282A) and guides the slide portion 283 in the longitudinal direction. When the second upstream connecting arm 282A swings, the slide portion 283 is guided along the guide portion 284, and the second downstream connecting arm 282B also swings. As a result, the second upstream seal body 162 and the second downstream seal body 172 can be interlocked.

  In addition, although the case where it interlock | cooperates with a link mechanism was illustrated here, this invention is not limited to this, It can also interlock | cooperate using another cam mechanism, a gear mechanism, etc.

  Next, with reference to FIG. 9, the top seal apparatus 100 of the packaging machine of 3rd embodiment is demonstrated. The other devices, parts, and members excluding a part of the top seal device 100 are the same as or similar to the packaging machine of the first embodiment, and are illustrated by matching the reference numerals as necessary. A part of the description will be omitted, and the description will focus on the differences from the first embodiment.

  As shown in FIG. 9A, in the top seal device 100 of the third embodiment, the first displacement mechanism 140 is installed on the first fixed base 114 in place of (or in combination with) the swing shaft. A second upstream side having a first upstream slider 250A and a first downstream slider 250B, in which the second displacement mechanism 180 is installed on the second fixed base 154 instead of (or in combination with) the swing shaft. It has a slider 290A and a second downstream slider 290B.

  The first upstream slider 250A slides the first upstream seal body 122 in parallel with the transport direction. The first downstream slider 250B slides the first downstream seal body 132 in parallel with the transport direction. The second upstream slider 290A slides the second upstream seal body 162 in parallel with the transport direction. The second downstream slider 290B slides the second downstream seal body 172 parallel to the transport direction. The first upstream return spring 142A includes the first downstream return spring 142B, the second upstream return spring 182A, and the second downstream return spring 182B. The sealing bodies 122, 132, 162, Slide 172 in a direction approaching the cutter blade 192.

  Further, the first displacement mechanism 140 has a first drive source 255 installed on the first fixed base 114, and the second displacement mechanism 180 has a second drive source 295 installed on the second fixed base 154.

  The first drive source 255 has a motor (not shown), a cam 255A rotated by the motor, and a pair of cam followers 255B in contact with the cam 255A. One of the cam followers 255B is installed on the first upstream seal body 122, and the other is installed on the first downstream seal body 132. The second drive source 295 has a motor (not shown), a cam 295A rotated by the motor, and a pair of cam followers 295B in contact with the cam 295A. One of the cam followers 295B is installed on the second upstream seal body 162, and the other is installed on the second downstream seal body 172.

  Therefore, as shown in FIG. 9B, when the cams 255A and 295A rotate, the distance between the pair of cam followers 255B and 295B is expanded to resist the urging force of each return spring 142A, 142B, 182A, 182B. Thus, the upstream sealer 120 and the downstream sealer 130 can slide to increase the distance between them.

  In particular, in the third embodiment, the movement timing of the upstream sealer 120 and the downstream sealer 130 can be arbitrarily set. For example, when the upstream side sealer 120 and the downstream side sealer 130 are separated from each other before cutting the packaging film YA1, the upstream side and downstream side unsealed portions are located in the vicinity of the cut surface TOL of the top seal portion TO1 (see FIG. 7). This is desirable because it is possible to equalize the lengths of the two.

  Although the case where the cam is driven by a motor is illustrated here, the present invention is not limited to this, and various power sources such as an air cylinder, a hydraulic cylinder, an electric or magnetic solenoid can be used. Of course, an operation in which the seal body approaches / separates can be used as a power source, and a desired operation may be obtained by combining this with a cam or gear mechanism.

  Next, with reference to FIG. 10, the top seal apparatus 100 of the packaging machine of 4th embodiment is demonstrated. The other devices, parts, and members excluding a part of the top seal device 100 are the same as or similar to the packaging machine of the third embodiment, and are illustrated by matching the reference numerals as necessary. In addition, a part of the description will be omitted, and the description will be focused on differences from the third embodiment.

  As shown in FIG. 10A, in the top seal device 100 of the fourth embodiment, the first displacement mechanism 140 is installed on the first fixed base 114 instead of (or in combination with) the swing shaft. A second upstream side having a first upstream slider 250A and a first downstream slider 250B, in which the second displacement mechanism 180 is installed on the second fixed base 154 instead of (or in combination with) the swing shaft. It has a slider 290A and a second downstream slider 290B.

  The four first upstream sliders 250 </ b> A, the first downstream slider 250 </ b> B, the second upstream slider 290 </ b> A, and the second downstream slider 290 </ b> B approach the packaging film YA <b> 1 side as they approach the cutter blade 192 side, and the cutter blade 192. It is installed so as to be farther away from the packaging film YA1 as it is farther from.

  Therefore, as shown in FIG. 10B, when the first upstream seal body 122 and the second upstream seal body 162 sandwich the packaging film YA1 in the upstream sealer 120, a part of the reaction force is The first upstream slider 250A and the second upstream slider 290A are converted into a force in the transport direction and slide upstream. Similarly, when the first downstream seal body 132 and the second downstream seal body 172 in the downstream sealer 130 pinch the packaging film YA1, a part of the reaction force is caused by the first downstream slider 250B and the second downstream slider 250B. It is converted into a force in the conveying direction by the downstream slider 290B and slides downstream. The movement limits of the upstream and downstream sealers 120 and 130 are set by engaging the upstream and downstream sealers 120 and 130 with the first and second fixing bases 114 and 154 (or stoppers not specifically shown). . When the movement limit is reached, the seal load of the urging member 114B can be made effective.

  Returning to FIG. 10A, the first and second displacement mechanisms 140 and 180 include upstream and downstream seal direction interlocking means 245 and 285.

  The upstream seal direction interlocking means 245 interlocks the displacement of the first upstream seal body 122 and the second upstream seal body 162. That is, only one of the first upstream seal body 122 and the second upstream seal body 162 is restricted from being displaced independently, and both perform the same (or symmetrical) operation. The downstream seal direction interlocking means 285 interlocks the displacement of the first downstream seal body 132 and the second downstream seal body 172. That is, only one of the first downstream-side seal body 132 and the second downstream-side seal body 172 is restricted from being displaced alone so that both perform the same (or symmetrical) operation.

  The upstream seal direction interlocking means 245 includes a first upstream engagement portion 246A that slides with the first upstream seal body 122, and a second upstream engagement portion 246B that slides with the second upstream seal body 162. The first upstream engagement portion 246A has a concave tapered surface, and the second upstream engagement portion 246B has a convex tapered surface. Therefore, as shown in FIG. 10B, when the first upstream seal body 122 and the second upstream seal body 162 approach, the taper of the first upstream engagement portion 246A and the second upstream engagement portion 246B is obtained. The surfaces engage with each other in the transport direction. As a result, the first upstream seal body 122 and the second upstream seal body 162 are interlocked. Thus, it is preferable that the concave tapered surface and the convex tapered surface are engaged to automatically center both of them.

  The downstream seal direction interlocking means 285 has a first downstream engagement portion 286A that slides with the first downstream seal body 132, and a second downstream engagement portion 286B that slides with the second downstream seal body 172. The first downstream engagement portion 286A has a concave tapered surface, and the second downstream engagement portion 286B has a convex tapered surface. Accordingly, when the first downstream seal body 132 and the second downstream seal body 172 approach each other, the tapered surfaces of the first downstream engagement portion 286A and the second downstream engagement portion 286B engage with each other in the transport direction. As a result, the first downstream seal body 132 and the second downstream seal body 172 are interlocked. Thus, it is preferable that the concave tapered surface and the convex tapered surface are engaged to automatically center both of them.

  In the above embodiment, the case where the upstream side sealer 120 and the downstream side sealer 130 are separated before the packaging film YA1 is cut is illustrated, but the present invention is not limited to this. Although the cutting of the cutter blade 192 at the time of cutting the packaging film is inferior, for example, as shown in FIGS. 11A and 11B, the cutter blade 192 is advanced (lowered) to cut the packaging film YA1, and then FIG. As shown in (C), the upstream sealer 120 and the downstream sealer 130 may be separated before the cutter blade 192 starts to retract from the bottom dead center. As a result, as shown in FIG. 11C, the cut surface TOL of the cut packaging film YA1 is separated in advance from the cutter blade 192 to be retracted, so that the cut of the cut surface TOL can be prevented and excellent. Can be aesthetic.

  Furthermore, in the said embodiment, although the case where the cutter blade 192 becomes a double blade was illustrated, this invention is not limited to this, As shown in FIG. In this case, you may move only the sealer (here upstream side sealer 120) which opposes the taper surface (grinding surface) of a single blade. This is because the portion corresponding to the blade thickness of the top seal portion TO1 remains on the tapered surface side after cutting, and it is sufficient to separate the sealer holding it from the cutter blade 192. In this case, the sealer may be moved before the cutter blade 192 starts to retract from the bottom dead center. This is because the length of the unsealed portion near the cut surface TOL can be made equal.

  Moreover, although the case where the cutter blade 192 was moved up and down by the air cylinder 194 was illustrated in the above embodiment, the present invention is not limited to this, and the cutter blade 192 is utilized using the approach and separation of the seal body in the top seal device. It is also possible to operate.

  Moreover, in the said embodiment, although the case where the packaging machine 1 carried out pillow packaging was illustrated, this invention is not limited to this, It is also possible to apply to other packaging forms, such as three-side seal packaging and four-side seal packaging.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea thereof. That is, in the above embodiment, the position, size, length, shape, material, orientation, and the like of each component can be changed as appropriate.

  For example, in the above embodiment, the film is transported sideways (horizontal direction), and the case of sealing and cutting by approaching and separating from the vertical vertical direction by the top seal device is illustrated, but the present invention is not limited thereto, The film can be conveyed vertically and vertically, and sealed and cut in a horizontal direction by a top seal device.

DESCRIPTION OF SYMBOLS 1 Packaging machine 2 Article supply apparatus 3 Film supply apparatus 4 Packaging machine main body 14 Bag making machine 16 Center seal apparatus 100 Top seal apparatus 110 First seal unit 114 First fixing stand 120 Upstream sealer 122 First upstream seal body 130 Downstream Side sealer 132 First downstream seal body 140 First displacement mechanism 140 Displacement mechanism 141A First upstream swing shaft 141B First downstream swing shaft 150 Second seal unit 154 Second fixed base 162 Second upstream seal body 172 Second downstream seal body 180 Second displacement mechanism 181A Second upstream swing shaft 181B Second downstream swing shaft 190 Cutter unit 192 Cutter blade 194 Air cylinder 240 First transport direction interlocking means 245 Upstream seal direction interlocking Means 246A First upstream engagement portion 246B Second upstream engagement portion 250A First upstream side Ida 250B First downstream slider 280 Second transport direction interlocking means 285 Downstream seal direction interlocking means 286A First downstream engagement portion 286B Second downstream engagement portion 290A Second upstream slider 290B Second downstream slider TO1 Top seal part TOL Cut surface YA1 Packaging film ZA1 Packaging

Claims (15)

A top seal device that seals and cuts a packaging film continuous in a first direction in a second direction perpendicular to the first direction to form a package,
A cutter blade that extends in the second direction and advances and retracts toward the packaging film to cut the packaging film;
An upstream sealer and a downstream sealer that are arranged on both sides of the cutter blade in the first direction, each of which sandwiches the packaging film and seals in a strip shape in the second direction;
After the upstream sealer and the downstream sealer contact the packaging film, and before the cutter blade that cuts the packaging film moves backward, the upstream sealer and the downstream sealer are moved in the first direction. A displacement mechanism that separates
A top seal device comprising: The displacement mechanism is
After the upstream side sealer and the downstream side sealer contact the packaging film and before the cutter blade cuts the packaging film, the upstream side sealer and the downstream side sealer are separated in the first direction. Characterized by
The top seal device according to claim 1. The displacement mechanism is
After the cutter blade cuts the packaging film and before the cutter blade that cut the packaging film moves backward, the upstream sealer and the downstream sealer are separated in the first direction. And
The top seal device according to claim 1. The upstream side sealer and the downstream side sealer each have a pair of seal bodies for sandwiching the packaging film,
The displacement mechanism has a swing shaft that swings the seal body in the first direction.
The top seal device according to any one of claims 1 to 3. The upstream side sealer and the downstream side sealer each have a pair of seal bodies for sandwiching the packaging film,
The pair of seal bodies has a pair of belt-shaped seal surfaces that come into contact with the packaging film,
The displacement mechanism includes an inclined position where the pair of belt-shaped sealing surfaces are inclined toward the cutter blade side with respect to the first direction, and a parallel position where the pair of belt-shaped sealing surfaces are parallel to the first direction. The pair of sealing bodies of at least one of the upstream sealer and the downstream sealer are angularly displaced so as to transition between
The top seal device according to any one of claims 1 to 4. The displacement mechanism is
The pair of seal bodies are angularly displaced so that they are in the inclined position when the seal body contacts the packaging film and in the parallel position when the cutter blade cuts the packaging film. To
The top seal device according to claim 5. The displacement mechanism includes biasing means for biasing the upstream sealer and the downstream sealer to approach each other.
The top seal device according to any one of claims 1 to 6. The displacement mechanism includes a slider that slides at least one of the upstream sealer and the downstream sealer in the first direction.
The top seal device according to any one of claims 1 to 7. The displacement mechanism is characterized in that the upstream sealer and the downstream sealer are separated from each other by using a sandwiching pressure of the packaging film by the upstream sealer or the downstream sealer.
The top seal device according to any one of claims 1 to 8. The displacement mechanism is
It has first direction interlocking means for interlocking displacement of the upstream sealer and displacement of the downstream sealer,
The top seal device according to any one of claims 1 to 9. The upstream side sealer and the downstream side sealer each have a pair of seal bodies for sandwiching the packaging film,
The displacement mechanism is
It has a seal direction interlocking means for interlocking the displacement of the pair of seal bodies in at least one of the upstream sealer and the downstream sealer.
The top seal device according to any one of claims 1 to 10. In the displacement mechanism, the separation distance in the first direction is set to be equal to or greater than the thickness of the cutter blade.
The top seal device according to any one of claims 1 to 11. The cutter blade is a single blade,
The displacement mechanism is
The one located on the taper surface side of the single blade in the upstream sealer and the downstream sealer is separated in the first direction,
The top seal device according to any one of claims 1 to 12. A supply device for supplying the packaging film;
A bag-making apparatus that forms the tubular film by bending the packaging film supplied from the supply apparatus in a width direction;
In the downstream of the bag making device, a center seal device for applying a center seal to the cylindrically formed packaging film
The top sealing device according to any one of claims 1 to 13, wherein the packaging film that has been center-sealed is sealed and cut in a width direction at a predetermined interval.
A packaging machine comprising: A packaging body manufacturing method in which a packaging film continuous in a first direction is sealed and cut in a second direction perpendicular to the first direction to form a packaging body,
After the upstream sealer and the downstream sealer arranged on both sides in the first direction with respect to the cutter blade come into contact with the packaging film and before the packaging film is cut by the cutter blade, the upstream sealer And applying tension to the packaging film by separating the distance in the first direction of the downstream sealer,
A packaging body, wherein the packaging film is sealed in the second direction by the upstream sealer and the downstream sealer, and the tension is applied in the first direction, and the cutter blade cuts the packaging film. Production method.

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