JP5331273B2 - Vertical packaging machine with squeezing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical packaging machine equipped with a wiping apparatus in which a wiping means is avoided to interfere with a packaging operation and a packaging material in a returning operation of the wiping means separating and keeping away from the packaging material in relation to an operation of horizontal seal and an operation of the wiping means. <P>SOLUTION: A wiping bar 27 being a wiping member comes into contact with a cylindrical packaging material 61 to carry out a wiping operation downward when going forward operation linked with an operation by which horizontal seal parts 54a and 54b approach the cylindrical packaging material for sealing the cylindrical packaging material 61 from an initial position occupied by the horizontal seal parts 54a and 54b when they are under a separated condition. When the horizontal seal parts 54a and 54b carry out a returning operation linked with an operation separating from the cylindrical packaging material 61 after the horizontal seal parts seal, as the wiping bar 27 returns to an original position by following a returning path separated to the backward side to the cylindrical packaging material 61 in comparison with the wiping path during forwarding operation, in this case, there exists no possibility of interfering of the wiping bar 27 to the cylindrical packaging material 61. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeezing apparatus in a bag packaging that operates in conjunction with a horizontal seal unit in a bag packaging such as a vertical bag making and filling packaging machine and provides a squeezing action to a product filled in the bag.

  For bagging of products into bags, moving the product position within the bag or improving the product filling rate by pushing the product into the bag from the outside of the bag during bag packaging. There are things to plan. Examples of products in which the products filled in the bag are to be ironed include rice cakes (food made from coarse flour). The package is forcedly squeezed from the outside of the bag so that the package does not move into the elongated bag after packaging. Other product examples include snacks such as potato chips and corn puffs, and frozen foods such as frozen potatoes, green beans, and pumpkins. These products vary in length, and may jump to the horizontal seal position depending on the dancing state at the time of filling. In such a case, the product with a seal bar (heat seal bar for heat welding) at the time of horizontal seal Biting occurs. Therefore, it is necessary to move the product in advance from the operating position of the seal bar into the bag by squeezing the bag.

  As an ironing device used in connection with a vertical packaging machine such as a vertical bag making filling and packaging machine, the horizontal seal unit used in the vertical packaging machine uses the operation when horizontal sealing is applied to the cylindrical packaging material. And there is something that performs squeezing operation. For example, there is a type in which the entire horizontal seal box is moved up and down and some of the stroke is used as an operation for the ironing operation. Apart from this, the horizontal seal box does not move up and down, but a separate drive source such as a cylinder is provided, and the separate drive source performs the ironing operation on the ironing member during the opening and closing of the horizontal seal block. is there.

The present applicant, as a squeezing device for a vertical bag making filling and packaging machine, laterally seals the packaging cylinder by means of a lateral sealing unit having two lateral sealing portions that are in contact with and away from each other. After the product is dropped and filled, the product is placed in the horizontal direction by sandwiching the upper part of the packaging cylinder from the horizontal seal part in the same direction as the horizontal seal part, and squeezing downward from the horizontal seal part before the horizontal seal part is closed. The ironing device which prevented the seal part from biting is proposed (refer to patent documents 1). Further, as a squeeze device for forming a flat portion that is heat-sealed by a horizontal seal unit, a device provided with a pair of scrapers and a pair of squeeze blocks provided below the pair so as to be movable in the vertical direction has been proposed. (Patent Document 2).
Japanese Examined Patent Publication No. 6-76087 (paragraphs [0007] to [0011], FIGS. 1 to 3) JP 2005-112359 A (paragraphs [0027] to [0043], FIGS. 1 to 3)

  Therefore, by devising the path between the forward movement in which the ironing means approaches and contacts the packaging material and the backward movement in which the ironing means moves away from the packaging material, the ironing means is used for the packaging machine in the return operation. There is a problem to be solved in that it does not interfere with the operation.

  An object of the present invention is to solve the above-mentioned problem, and a vertical type equipped with a squeezing device that avoids interference of the squeezing means with the wrapping operation or the wrapping material in a backward operation in which the squeezing means moves away from the packaging material To provide a packaging machine.

In order to solve the above-mentioned problems, a vertical packaging machine provided with a squeezing device according to the present invention is arranged in such a manner that a cylindrical packaging material into which a package is inserted and which is fed in the vertical direction is arranged facing each other and in contact with each other. A transverse seal unit having two transverse seal portions that operate to separate and sandwich the tubular packaging material when it approaches and seals the tubular packaging material, and each of the transverse seal portions is disposed. And a squeezing device having two squeezing members that perform squeezing operation with respect to the tubular packaging material in conjunction with the operation of contacting and separating the lateral seal portions. When each lateral seal portion is in a forward operation in conjunction with an operation in which each lateral seal portion approaches the tubular packaging material for the sealing of the tubular packaging material from an initial position occupied when each lateral seal portion is in a separated state , Before going through the ironing route In contact with the cylindrical packaging material, it moves downward and the lateral seal portion is operated against the cylindrical packaging material during a return operation in conjunction with an operation of separating from the cylindrical packaging material after sealing. Ri consists return follows a return path away to the rear side of the initial position Te, the ironing device, squeezing portion into which the fitted with the ironing member to the tip provided for each horizontal seal portions, each squeezing member A first cam mechanism that defines the ironing path and the return path, and the engagement state of the ironing part is switched between the forward operation and the backward operation, and the cam is directly cam-engaged with the ironing part and A second cam mechanism is provided for defining a limit on the ironing side of the ironing path of each ironing member. The first cam mechanism is formed with a cam groove and each ironing member reaches the end of the ironing path. When And a movable cam plate that switches a position occupied when the end of the return path is reached, and a first cam follower that is provided in the ironing portion and fits in the cam groove, the cam groove The movable cam plate occupies one of the positions, and is connected to the rotating cam groove portion through which the first cam follower passes correspondingly when the ironing member follows the ironing path. And the first cam follower changes the posture of the ironing member in response to the movable cam plate being switched to move to the other position and when the ironing member follows the initial stage of the return path. have I consists to have a delay cam groove to pass without.

According to the vertical packaging machine provided with the ironing device, in the backward operation in which the ironing member moves away from the tubular packaging material, the return route is different from the ironing route in the forward operation in which the ironing operation is performed closer. Thus, the ironing operation does not interfere with the packaging operation or the packaging material.
In addition, since the ironing portion is provided for each horizontal seal portion and the ironing member is attached to the tip, the forward operation and the backward operation are performed in conjunction with the operation of the horizontal seal portion. Since the ironing path and the return path are determined by mechanical mechanisms such as a first cam mechanism and a second cam mechanism, respectively, the ironing member can follow the ironing path and the return path. Particularly, since the engagement state of the first cam mechanism with the ironing portion is switched between the forward operation and the reverse operation, each ironing member can follow the ironing route and a return route different from the ironing route. The second cam mechanism defines the ironing side limit of the ironing path of each ironing member. As a result, the ironing member does not come too close to the cylindrical packaging material beyond the ironing side limit, and can perform an appropriate ironing operation on the cylindrical packaging material.
Furthermore, the second cam mechanism determines the ironing side limit of each ironing member in response to the first cam follower passing through the rotating cam groove in the first cam mechanism by the forward movement of the lateral seal portion. The member follows the ironing path. When the squeezing member reaches the end of the squeezing path, the position of the movable cam plate is switched. At this time, the first cam follower only passes through the delay cam groove part connected to the rotating cam groove part. There is no change in the posture of the member. By the backward movement of the lateral seal portion, the operation of the ironing member is delayed while the first cam follower passes through the delay cam groove portion in the reverse direction (direction connected to the rotation cam groove portion). At this time, the ironing member does not substantially change its posture, and the ironing member moves backward toward the rear side with respect to the tubular packaging material. Thereafter, the ironing portion follows the return path, but does not interfere with the cylindrical packaging material and push up. When the ironing member reaches the end of the return path, the movable cam plate is switched to return to the initial state of the packaging cycle.

In the vertical wrapping machine provided with the squeezing device, the return path followed by the squeezing members is moved backward from the squeezed cylindrical packaging material to a position where it does not contact the cylindrical wrapping material. , It can be a path that returns upward and returns to the initial position. By defining the return path in this way, the ironing member moves in the direction that leaves the cylindrical packaging material earliest and efficiently at the start of the backward operation in the packaging cycle, and the ironing member that has started the backward operation moves into the cylindrical packaging. Interference with the material can be avoided.

  In the vertical packaging machine including the ironing device, the second cam mechanism includes a fixed cam plate having a cam profile that defines the ironing side limit, and a cam member that is provided in the ironing portion and is urged toward the cam profile. And a second cam follower. According to this second cam mechanism, in the forward movement of the lateral seal portion, the second cam follower provided in the ironing portion is guided toward the cam profile while being urged toward the cam profile of the fixed cam plate. The member does not come closer to the cylindrical packaging material than the ironing side limit of the ironing path.

  In the vertical wrapping machine provided with the ironing device, each ironing part is a bracket that can be rotated around a common axis parallel to the longitudinal direction of the seal at each end in the longitudinal direction of the seal with respect to each lateral seal part, An ironing arm that is slidably held along an axis orthogonal to the axis with respect to each of the brackets, and that functions as the second cam follower, and is connected to the distal ends of the ironing arms. An ironing bar serving as the ironing member, and spring means for biasing the ironing arm toward the second cam mechanism with respect to the bracket can be provided. The bracket of the ironing portion is rotated with respect to the lateral seal portion by the operation of the first cam mechanism when approaching the packaging material by the forward movement of the lateral seal portion. When the bracket rotates, the ironing arm functioning as the second cam follower is guided to the fixed cam plate while being biased toward the fixed cam plate of the second cam mechanism by the spring means. By the guidance by the fixed cam plate, the ironing member follows an ironing path that is restricted so as not to approach the cylindrical packaging material than the ironing side limit. When the ironing arm rotates, the change in the distance between the bracket and the second cam follower guided by the fixed cam plate is absorbed by the ironing arm sliding with respect to the bracket due to the bending of the spring means. Is done. In this way, the first cam mechanism and the second cam mechanism can avoid mechanical interference with each other.

  In the vertical packaging machine provided with the ironing device, the movable cam plate contacts the ironing arm when the movable cam plate is switched to move to the other position, and the ironing member is separated rearward from the cylindrical packaging material. An engaging portion can be provided. When the forward movement of the horizontal seal portion is completed, the position of the movable cam plate can be switched. At this time, the engaging portion of the movable cam plate comes into contact with the ironing arm, and the ironing member is separated rearward from the cylindrical packaging material. Thereafter, in the returning operation of the horizontal seal portion, the ironing member is returned to the initial position in a state where the ironing member is separated from the cylindrical packaging material. When the spring means for urging the ironing arm is provided, when the movable cam plate is switched and moved to the other position, the engaging portion comes into contact with the ironing arm to attach the ironing arm by the spring means. Regardless of the force, the ironing arm can cause the ironing member to perform the cam operation by the first cam mechanism (the ironing member follows the return path) regardless of the second cam mechanism.

  In the vertical wrapping machine provided with the ironing device, the vertical wrapping machine is disposed inside the cylindrical wrapping material and is filled with a filling cylinder into which a product to be packaged is charged, and the cylindrical wrapping material It can be said that it is a vertical bag making filling and packaging machine provided with a feed mechanism that feeds in the vertical direction along the outer peripheral surface of the cylinder. By applying this vertical packaging machine to a vertical bag making filling and packaging machine, it is possible to sequentially and continuously package products that are put through the filling cylinder at a high packaging speed.

The vertical packaging machine provided with the ironing device according to the present invention is configured as described above, so that the ironing member follows the ironing path by the first cam mechanism during the forward movement of the horizontal seal portion. The second cam mechanism sets the limit on the ironing side of the ironing path, so the ironing member may force the ironing operation by approaching the tubular packaging material more than that. Absent. The return path in which the ironing member moves away from the cylindrical packaging material during the backward movement of the horizontal seal is when the ironing member approaches the cylindrical packaging material during the forward movement of the horizontal seal. This is a route different from the ironing route, and the ironing operation can be prevented from interfering with the packaging operation or the packaging material. In addition, when the squeezing member moves away from the packaging material and moves away, the squeezing member does not interfere with the packaging operation or the cylindrical packaging material, and therefore the vertical packaging machine is equipped with an ironing device that does not lift the cylindrical packaging material. Can be provided.
In addition, the ironing portion is provided for each horizontal seal portion and is configured by attaching a ironing member to the tip, so that the forward operation and the backward operation are performed in conjunction with the operation of the horizontal seal portion. Are followed by paths defined by mechanical mechanisms of a first cam mechanism and a second cam mechanism, respectively. Particularly, since the engagement state of the first cam mechanism with the ironing portion is switched between the forward operation and the backward operation, each ironing member follows the ironing route and a return route different from the ironing route. Can do.
Furthermore, the second cam mechanism determines the ironing side limit of each ironing member in response to the first cam follower passing through the rotating cam groove in the first cam mechanism by the forward movement of the lateral seal portion. The member follows the ironing path. When the squeezing member reaches the end of the squeezing path, the position of the movable cam plate of the first cam mechanism is switched. At this time, the first cam follower passes through the delay cam groove connected to the rotating cam groove. There is no change in the posture of the ironing member. By the backward movement of the lateral seal portion, the operation of the ironing member is delayed while the first cam follower passes through the delay cam groove portion in the reverse direction (direction connected to the rotation cam groove portion). At this time, the ironing member does not substantially change its posture, and the ironing member moves backward toward the rear side with respect to the tubular packaging material. Thereafter, the ironing portion follows the return path, but does not interfere with the cylindrical packaging material and push up. When the ironing member reaches the end of the return path, the movable cam plate is switched and can return to the initial state of the packaging cycle.

  Hereinafter, an embodiment of a vertical packaging machine provided with a ironing device according to the present invention will be described with reference to the accompanying drawings. 1A and 1B are diagrams showing an example of a main part of a vertical packaging machine provided with an ironing device according to the present invention, in which FIG. 1A is a plan view and FIG. 1B is a schematic view showing a drive unit. 2 is a front view of the main part of the vertical packaging machine shown in FIG. 1, FIG. 3 is a side view of the main part of the vertical packaging machine shown in FIG. 1, and FIG. FIG. 4 is a left side view showing a state where the ironing operation of the ironing device is completed.

  The ironing apparatus according to the present embodiment is applicable to a known vertical bag making filling and packaging machine. As shown schematically in FIG. 10, the vertical bag making filling and packaging machine 50 includes a former 51 that bends the web-like packaging material 60 into a substantially cylindrical shape, and a product filling cylinder 52 that is inserted into the former 51. The vertical sealing device 53 for forming the packaging material bent on the front side of the product filling cylinder 52 into the cylindrical packaging material 61, and the cylindrical packaging material 61 provided so as to sandwich the left and right sides of the product filling cylinder 52. A feed belt device 55 that feeds between the outer surfaces of the product filling cylinders 52 and a lateral seal unit 54 provided below the product filling cylinders 52 are provided. The continuous web-shaped packaging material 60 is bent into a cylindrical shape so as to be guided to the former 51 and wrap the product filling cylinder 52, and is sent downward by the feed belt device 55, and is vertically sealed on one side of the product filling cylinder 52. The web 53 is formed in the cylindrical packaging material 61 by vertically heat-sealing the web edges. By dropping and filling the product S, which is an article to be packaged, into the cylindrical packaging material 61 through the product filling cylinder 52, and sealing the cylindrical packaging material 61 at both the upper and lower positions of the filled product S by the horizontal seal unit 54, The bag package 63 in which the product S is packaged can be continuously manufactured.

  As shown in FIG. 10, the horizontal seal unit 54 includes horizontal seal portions 54 a and 54 b that are arranged to face each other with the cylindrical packaging material 61 interposed therebetween, and incorporates a cutter 56. The cutter 56 is disposed so as to be capable of advancing and retreating toward the other horizontal seal portion 54b, for example, between a pair of upper and lower heat seal bars of a heater block provided in one horizontal seal portion 54a. The other horizontal seal portion 54b is formed with a cutter groove 57 into which the advanced cutter 56 can enter between a pair of upper and lower heat seal bars of the heater block. The lateral seal unit 54 approaches and separates from the side during its operation, and the lateral seal portions 54a and 54b are formed in a bag 62 formed subsequent to the mouth portion of the preceding bag packaging 63 with the tubular packaging material 61 interposed therebetween. Heat seal the bottom of At this time, the cutter 56 advances to a position in the cutter groove 57, cuts the cylindrical packaging material 61, and separates the previously produced bag packaging 63 from the subsequent bag 62 (cylindrical packaging material 61). To do. Although not shown, the product S to be put in is temporarily received on the way above the lateral seal unit 54, and when the lateral seal portions 54a and 54b are separated, the received product S is released to the bottom of the bag 62. A shutter to be thrown in can also be provided. FIG. 10 shows an outline of the ironing arms 58 and 58 having a conventional structure and the ironing bar 59 provided over the distal end portion thereof.

  In order to drive the horizontal seal unit 54, a drive mechanism that uses the output of a drive motor such as a servo motor (not shown) or an actuator such as an air cylinder is used. As an example of the drive mechanism, similarly to the mechanism described in Patent Document 1, a horizontal seal opening / closing lever (hereinafter abbreviated as “lever”) is rotated, and the rotation is transferred to the horizontal seal portion via the conversion mechanism. A mechanism for bringing 54a and 54b closer to and away from each other in synchronization can be given.

  As shown in FIG. 1B, in this drive mechanism, one end of the lever 10 that rotates around the central shaft 11 is connected to the horizontal slide block 14 via, for example, a link 12. Guide shafts 16 and 16 are attached to the left and right ends. The guide shafts 16, 16 are slidably supported through the fixed frame 2, extend beyond the seal position C-C to the opposite side, and are fitted with cutters 17, 17 at their tips. A horizontal seal block 18 of a horizontal seal portion 54a containing 56 is attached. The other end of the lever 10 is connected to the lateral seal block 20 of the lateral seal portion 54b via the link 15 and the pivot shaft 19 at the tip end portion. The reciprocating rotational movement of the lever 10 is converted / transmitted into the advancing / retreating operation of the lateral seal portion 54 b with respect to the cylindrical packaging material 61. The guide shafts 16 and 16 support the lateral seal portion 54a so as to be slidable.

  According to the structure of the lateral seal unit 54, when the lever 10 is rotated around the central shaft 11 by the drive mechanism, the lateral seal is interposed via the link 12, the lateral slide block 14, the both guide shafts 16 and 16, and the lateral seal block 18. The part 54 a advances and retracts toward the cylindrical packaging material 61, while the other lateral seal part 54 b faces the cylindrical packaging material 61 via the link 15, the pivot shaft 19, and the lateral seal block 20. Advances and retracts in synchronization with the horizontal seal portion 54a. The cylindrical packaging material 61 is sandwiched from each side in synchronization by the heater blocks of the horizontal seal portions 54a and 54b, and the opening end portion of the packaging bag 63 between the two sets of heat seal bars located above and below the heater blocks. And heat sealing is performed by heating and pressurizing the bottom end portion of the subsequent packaging bag.

  The ironing device 1 is provided in association with the lateral seal unit 54 and includes a pair of ironing portions 21 and 22 disposed on each side of the cylindrical packaging material 61. In particular, as shown in FIGS. 3 and 4, the ironing portions 21 and 22 are respectively provided with shaft support portions (fulcrum pins) 24 and 24 pivotally attached to the horizontal seal blocks 18 and 20 of the horizontal seal portions 54a and 54b at the intermediate portions. Each of the shaft support portions 24 includes a pair of left and right brackets 23 and 23, ironing arms 25 and 25 slidably inserted into the brackets 23 and 23, and ironing arms 25 and 25. An ironing bar 27 is provided as an ironing member that is spanned between the front end portions of the head portions 26 and 26 and can be ironed and engaged from the outside of the packaging bag. It can be said that the ironing parts 21 and 22 constitute ironing driving parts that drive ironing members including the ironing arms 25 and 25 and the ironing bar 27. An ironing mechanism is composed of the ironing drive unit and the ironing member.

  In each of the squeezing portions 21 and 22, the shaft support portions 24 to which the brackets 23 and 23 can rotate are provided at both ends in the seal longitudinal direction with respect to the horizontal seal blocks 18 and 20, respectively. It is a common axis parallel to the direction. Further, the squeezing arms 25 and 25 are held so as to be slidable along the axis orthogonal to the common axis with respect to the brackets 23 and 23, respectively. Between the brackets 23 and 23 and the head portions 26 and 26, coil springs 28 and 28 as spring means are fitted in a compressed state so as to be inserted into the ironing arms 25 and 25. The ironing arms 25, 25 are biased forward by the coil springs 28, 28 in the direction in which the ironing bar 27 protrudes, but when the tail portion 29 of each ironing arm 25 comes into contact with the bracket 23, the ironing arm 25 is It is a stopper that prevents the bracket 23 from coming out further. In this manner, the ironing bar 27 is configured so that the brackets 23 and 23 rotate with respect to the horizontal seal blocks 18 and 20, and the ironing arms 25 and 25 slide with respect to the brackets 23 and 23. The position with respect to 18 and 20 (attitude corresponding to the position) can be changed.

  The first cam mechanism 30 is used as a conversion mechanism for converting the lateral seal forward operation when the horizontal seal unit 54 approaches the cylindrical packaging material and sandwiches the cylindrical packaging material to apply the sealing to the squeezing operation by the squeezing portions 21 and 22. Is provided. The horizontal seal unit 54 has a first cam that defines an ironing path and a return path of the ironing bar 27 as an ironing member in the operation, that is, the operation in which the horizontal seal unit 54 approaches and further moves away from the tubular packaging material 61. Mechanisms 30, 30 are provided. The details of the first cam mechanism 30 are shown in FIGS. It is sufficient that the first cam mechanisms 30 and 30 are provided only in one of the left and right directions (the left side in FIG. 1 in this example) in the ironing portions 21 and 22. Each first cam mechanism 30 is provided on the movable cam plate 31 whose position is switched when the ironing bar 27 reaches the end of the ironing path and the end of the return path, and the bracket 23 for cooperating with the movable cam plate 31. The first cam follower 33 is provided. The movable cam plate 31 is disposed in a bilaterally symmetrical position with the cylindrical packaging material 61 interposed therebetween, and is provided so as to be movable in the front-rear direction by air actuators 38 and 38 (see FIG. 1) provided on the fixed frame 2, for example. Yes. By actuating the air actuators 38, 38, the movable cam plate 31 is switched between the first position advanced toward the cylindrical packaging material 61 side and the second position retracted in the direction away from the cylindrical packaging material 61. . That is, in the first cam mechanism 30, each movable cam plate 31 is engaged with the ironing portions 21 and 22 in the forward and backward operations of the lateral seal portions 54a and 54b, as will be described in detail later. Switch.

  Each movable cam plate 31 is formed with a cam groove 32 into which the first cam follower 33 is fitted to guide the movement of the first cam follower 33. The cam groove 32 occupies the first position of the movable cam plate 31, and a rotating cam groove portion 34 through which the first cam follower 33 passes and rotates the bracket 23 during the lateral seal forward operation, and the first cam There is a delay cam groove 35 that is connected to the groove 34 and only passes through the first cam follower 33 without changing the posture of the bracket 23 when the movable cam plate 31 is switched to move to the second position. doing. The rotating cam groove portion 34 includes an inclined groove portion 36 (see FIG. 6) at a portion connected to the delay cam groove portion 35. As a result, the cam groove 32 has a step-like profile as a whole. Since the first cam follower 33 is provided at the tip of a lever attached to the bracket 23 in the shaft support portion (fulcrum pin) 24, the posture with respect to the bracket 23 is constant. Each movable cam plate 31 includes an engaging portion 37 that engages with the tail portion 29 of the ironing arm 25 when the movable cam plate 31 is switched from the first position to the second position. The engaging portion 37 functions to retreat the ironing bar 27 that has followed the ironing path at the time of such position switching away from the packaging material that has been ironed.

  In the first cam mechanism 30, when the first cam follower 33 moves along the inclined groove portion 36, the bracket 23 and the ironing arm 25 rotate. When the arm 25 rotates, the limit of the ironing side is determined by the cam profile 42 of the second cam mechanism 40 in the second cam mechanism 40, whereby the ironing bar 27 follows the ironing path. The ironing bar 27 does not follow a path biased toward the ironing side beyond that, but there is no restriction on the ironing side. The position of the squeezing bar 27 is determined by the first cam mechanism 30 and the second cam mechanism 40 in the forward and backward movements of the lateral seal blocks 18 and 20.

  The second cam mechanism 40 defines the ironing side limit of the ironing path that the ironing bar 27 should follow. The second cam mechanism 40 includes left and right cam plates 41 and 41 (FIG. 1) fixed by being attached to the fixed frame 2. Each cam plate 41 is arranged with its center aligned with the sealing position C-C, and cam profiles 42 and 42 having symmetrical cam surfaces are formed on the front and rear side surfaces. The cam profiles 42, 42 are cam shapes that define the ironing side limit of the ironing path of the ironing bar 27, and are formed on a slope closer to the seal position CC toward the lower side and farther from the seal position CC. The bottom part is a vertical surface.

  The second cam mechanism 40 also includes second cam followers 43 and 43 that can move following the cam profiles 42 and 42 of the cam plates 41. Each second cam follower 43 is rotatably supported by the head portion 26 of each ironing arm 23 so as to protrude left and right, and is composed of a roller that can engage with the cam and roll on the cam profile 42. . Since each ironing arm 25 is biased toward the cam profile 42 by the coil spring 28 (the withdrawal is prevented by the tail portion 29 coming into contact with the bracket 23), the forward movement of the lateral seal blocks 18, 20 When the ironing bar 27 is rotated by the first cam mechanism 30, each second cam follower 43 in the second cam mechanism 40 is moved to the cam profile 42 by the biasing force of the coil spring 28 after the cam engagement with the cam profile 42. It abuts and is guided by the cam profile 42. Therefore, the limit of the ironing side is determined by the cam profile 42 in the path followed by the ironing bar 27, and the path does not deviate further to the ironing side. When the bracket 23 (the ironing bar 27) rotates, the change in the distance between the bracket 23 and the cam profile 42 is absorbed by the deflection of the coil spring 28, which is a spring means, and the ironing bar 27 eventually becomes a cam profile. Follow the ironing path according to 42.

  FIG. 3 shows how the characteristic portions of the mechanisms of the first cam mechanism 30 and the second cam mechanism 40 change over time. Here, the characteristic parts are one of the shaft support parts 24, the ironing arms 25 and 25, the ironing bars 27 and 27, the tail parts 29 and 29, and the first cam follower 33 and the second cam followers 43 and 43. As the horizontal seal blocks 18 and 20 move forward, the ironing bar 27 crosses the front of the horizontal seal portions 54a and 54b downward by the action of the first cam mechanism 30 and the second cam mechanism 40 in the forward movement. Squeezing action.

  FIG. 4 shows a state in which the lateral seal portions 54a and 54b of the lateral seal unit 54 have moved forward, sandwiched the tubular packaging material 61, and heat sealed to the tubular packaging material 61 to produce the bag 63. Yes. The ironing portions 21 and 22 are in a state where the ironing bars 27 and 27 have finished the ironing operation with respect to the tubular packaging material 61. In a state in which the horizontal seal portions 54a and 54b move forward to seal the cylindrical packaging material 61, the shutters 58 and 58 sandwich the cylindrical packaging material 61 immediately above the horizontal seal portions 54a and 54b, and the product S is further down. Prevents falling to the side. The shutters 58 and 58 are provided in the horizontal seal portions 54a and 54b with a buffering action by a spring.

  5-8 is a figure explaining the action | operation of the vertical packaging machine provided with the ironing apparatus by this invention with progress of time. Hereinafter, a pair of front and rear is provided for the first cam mechanism 30; however, one first cam mechanism 30 will be described, and a pair of left and right cam mechanisms 40 are also provided, but only one second cam mechanism 40 is provided. This will be described using reference numerals. The same operation is performed for the remaining other mechanism, but the description thereof is omitted. FIG. 5 is a diagram illustrating a state before the ironing operation by the ironing device 1 is started. The lateral seal portion 54a (54b) is in a retracted position and is not in contact with the tubular packaging material 61. In the first cam mechanism 30, the movable cam plate 31 occupies the first advanced position, and the first cam follower 33 is located at the rear position of the rotating cam groove 34 which is the lower portion of the cam groove 42. . In the second cam mechanism 40, the second cam follower 43 is located away from the second cam profile 42 that is the cam surface of the fixed cam plate 41. As a result, the ironing arm 25 occupies a relatively upright posture so that the tail portion 29 does not come out of the bracket 23 due to contact with the bracket 23 and does not come into contact with the tubular packaging material 61.

  FIG. 6 is a diagram illustrating a state in which the ironing operation by the ironing device 1 is completed as in FIG. 4. The horizontal seal portion 54a (54b) occupies the most advanced position and is in a state where the cylindrical packaging material 61 is sandwiched and heat-sealed. In the first cam mechanism 30, the rotating cam groove portion 34 performs a forward movement in which the ironing portion 21 (22) moves forward as a whole through the shaft support portion 24 as the lateral seal portion 54 a (54 b) advances. The ironing bar 27 rotates around the shaft support portion 24 by the cam action of the inclined groove portion 36. After the second cam follower 43 abuts on the cam profile 42 of the fixed cam plate 41, the second cam follower 43 is further guided by the cam profile 42 and moves downward while approaching each other, and the lateral seal portion 54a (54b) is formed in a cylindrical package. Before completing the sandwiching of the material 61, the tubular packaging material 61 is sandwiched and squeezed out.

  In FIG. 6, the ironing bar 27 occupies a position directly below the horizontal seal portion 54a (54b). At this time, the distance between the shaft support portion 24 of the bracket 23 and the cam profile 42 of the fixed cam plate 41 has a change (becomes shorter). This change in the distance is caused by the bending of the coil spring 28 (further compression. ) Is absorbed by the ironing arm 25 sliding (retracting) with respect to the bracket 23. The second cam follower 43 is kept pressed against the cam profile 42 by the repulsive force of the coil spring 28. In the first cam mechanism 30, the movable cam plate 31 still occupies the first position advanced, and the first cam follower 33 is a delay which is the upper part through the inclined groove part 36 of the cam groove part 34 for rotation of the cam groove 32. The cam groove portion 35 is located at a connecting position.

  7 does not change the position of the horizontal seal portion 54 a (54 b), and hence the position and posture of the ironing portion 21 (22) from FIG. 6, but in the first cam mechanism 30, the movable cam plate 31 is the air actuator 38. By the operation of (FIG. 1), it is retracted from the advance position shown in FIG. 6 to the second position shown in FIG. Accordingly, the first cam follower 33 moves relative to the movable cam plate 31, moves in the delay cam groove portion 35 of the cam groove 32, and is positioned at the front end of the delay cam groove portion 35. At this time, the engaging portion 37 attached to the movable cam plate 31 abuts on the tail portion 29 of the ironing arm 25 and further slides the ironing arm 25 in the direction of retreating from the bracket 23, so that the ironing bar 27 Moves away from the tubular packaging material in the backward direction. The ironing portion 21 (22) is in a head-down state, that is, the ironing arm 25 is retracted while maintaining a posture with a low standing angle.

  FIG. 8 shows a state in which the horizontal seal portion 54a (54b) is retracted from the position of FIG. The movable cam plate 31 occupies the same position as that shown in FIG. The bag packaging 63 is separated from the cylindrical packaging material 61 by the cutting action of the cutter 56 incorporated in the horizontal seal portion 54a (54b), and is dropped and discharged downward. When the horizontal seal portion 54a (54b) is retracted, the ironing portion 21 (22) is also retracted via the shaft support portion 24. Initially, the ironing arm 25 is extended by the coil spring 28 so that the tail portion 29 is engaged with the engaging portion. 37, the position of the ironing bar 27 is hardly changed. Thereafter, the first cam follower 33 of the first cam mechanism 30 moves backward from the delay cam groove portion 35 that is the upper portion of the cam groove 32 of the movable cam plate 31 to the inclined groove portion 36. As a result, the ironing bar 27 jumps up in the conventional case and easily comes into contact with the cylindrical packaging material 61, and retreats in a low posture to avoid contact with the cylindrical packaging material 61. be able to.

  FIG. 9 schematically shows an ironing path and a return path in the ironing operation obtained by the present invention. As understood from the above operation, in the forward movement of the lateral seal portion 45a (45b), the first cam follower 33 passes through the rotating cam groove portion 34 in the first cam mechanism 30 and the second cam mechanism 40 When the two cam follower 43 moves following the cam profile 42, each ironing bar 27 follows the ironing path 48. Since the coil spring 28 is bent, the operations of the cam mechanisms 30 and 40 do not interfere with each other. When the ironing bar 27 reaches the end of the ironing path 48, the movable cam plate 31 is switched to the second position. At this time, the first cam follower 33 only passes through the delay cam groove portion 35 connected to the rotation cam groove portion 34, but the engaging portion 37 of the movable cam plate 31 is engaged with the tail portion 29 of the ironing arm 25. Since the ironing arm 25 is retracted against the urging force of the coil spring 28, the ironing bar 27 moves away from the tubular packaging material in the backward direction. When the first cam follower 33 passes from the delay cam groove portion 35 through the turning cam groove portion 34 by the backward movement of the lateral seal portion 45a (45b), each squeezing bar 27 moves away from the cam profile 42 of the second cam mechanism 40. The return path 49 is followed to return to the position originally occupied. When the ironing bar 27 reaches the end of the return path 49, the movable cam plate 31 is switched to the first position and returns to the initial state of each packaging cycle.

Thus, the return path 49 followed by the squeezing member 27 returns to the position where it does not come into contact with the cylindrical packaging material 61 after moving backward from the cylindrical packaging material 61 and then returns to the initial direction. This is a route back to the position. Since the return path 49 of the ironing member 27 is determined as a path different from the ironing path 48 in the forward operation, the ironing bar 27 is quickly and efficiently moved from the cylindrical packaging material 61 to the rear side at the start of the backward operation. It is possible to avoid the inconvenience that the ironing bar 27 that has moved backward and started the reverse operation interferes with the cylindrical packaging material 61 and pushed up, and the ironing portions 21 and 22 can be smoothly ironed.

The top view which shows an example of the principal part of the vertical packaging machine provided with the ironing apparatus by this invention. The front view of the principal part of the vertical packaging machine shown in FIG. It is a side view of the principal part of the vertical packaging machine shown in FIG. 1, and is a right side view showing the transition of the ironing device every minute time. It is a side view of the principal part of the vertical packaging machine shown in FIG. 1, and is a left side view showing a state where the ironing operation of the ironing device is completed. The side view which shows the operation | movement of the vertical packaging machine provided with the ironing apparatus by this invention with progress of time, and shows the state of the principal part before ironing operation start. The side view which shows the state of the principal part at the time of ironing operation completion after the state shown in FIG. FIG. 7 is a side view showing a state after switching of the movable cam plate of the second cam mechanism after the state shown in FIG. 6. The side view which shows the state which the horizontal seal part retracted after the state shown in FIG. It is a schematic diagram which shows the ironing path | route and return path | route in the ironing operation | movement obtained by this invention. The perspective view which shows an example of the conventional vertical bag making filling packaging machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ironing apparatus 2 Fixed frame 10 Lever 11 Central shaft 12 Link 14 Horizontal slide block 15 Link 16, 16 Guide shaft 17, 17 Mounting tool 19 Pivoting shaft 18, 20 Horizontal seal block 21, 22 Ironing part 23, 23 Bracket 24 axis Branch (fulcrum pin)
25, 25 Ironing arm 26, 26 Head part 27 Ironing bar 28, 28 Coil spring 29 Tail part (stopper)
30 First cam mechanism 31, 31 Movable cam plate 32, 32 Cam groove 33, 33 First cam follower 34, 34 Rotating cam groove portion 35, 35 Delay cam groove portion 36, 36 Inclined groove portion 37, 37 Block 38, 38 Actuator 40 Second cam mechanism 41, 41 Fixed cam plate 42, 42 Cam profile 43, 43 Second cam follower 48 Ironing path 49 Return path 50 Vertical bag making filling packaging machine 51 Former 52 Product filling cylinder 53 Vertical sealing device 54 Horizontal sealing unit 54a , 54b Horizontal seal portion 55 Feed belt device 56 Cutter 57 Cutter groove 58, 58 Shutter 60 Web-like packaging material 61 Cylindrical packaging material 62 Bag 63 Bag packaging body CC Seal position S Product

Claims (6)

The cylindrical packaging material is placed inside and opposed to each other, and the cylindrical packaging material that is fed in the longitudinal direction is placed in contact with and separated from each other. A horizontal seal unit having two horizontal seal portions for sealing the inner seal, and the tubular package disposed in association with each of the horizontal seal portions and interlocking with the operation of contacting and separating the horizontal seal portions. An ironing device having two ironing members that act on the wood;
The both squeezing members are operated such that each lateral seal portion approaches the tubular packaging material for the sealing of the tubular packaging material from an initial position occupied when the lateral seal portions are separated from each other. During the linked forward operation, it moves through the ironing path to make contact with the cylindrical packaging material and move downward, and the lateral seal portions move away from the cylindrical packaging material after sealing. Ri consists to return to the initial position following a return path away to the rear side with respect to the tubular packaging material when the recovery operation in conjunction with,
The ironing device is provided with respect to each of the lateral seal portions, the ironing portion having the ironing member attached to the tip thereof, the ironing route and the return route of each ironing member are defined, and the forward operation and the return operation A first cam mechanism that switches the engagement state with the ironing portion, and a second cam mechanism that directly cam-engages with the ironing portion to determine the ironing side limit of the ironing path of each ironing member. And
The first cam mechanism includes a movable cam plate in which a cam groove is formed and a position occupied by each of the ironing members when reaching the end of the ironing path and when reaching the end of the return path; A first cam follower provided in the ironing portion and fitted in the cam groove,
In the cam groove, the movable cam plate occupies one of the positions, and the rotating cam groove portion through which the first cam follower passes correspondingly when the ironing member follows the ironing path, and the rotating cam. The first cam follower is in the posture of the squeezing member when connected to the groove and when the movable cam plate is switched to move to the other position and when the squeezing member follows the initial stage of the return path. A vertical wrapping machine provided with a squeezing device comprising a delay cam groove portion that passes through without being changed . The return path followed by the both squeezing members returns to the initial position after returning to a position where the return path is away from the squeezed tubular packaging material and does not contact the tubular wrapping material. A vertical packaging machine provided with the ironing device according to claim 1, which is a route. The second cam mechanism includes a fixed cam plate having a cam profile defining the ironing side limit, and a second cam follower provided in the ironing portion and biased toward the cam profile to engage with the cam. A vertical packaging machine comprising the ironing device according to claim 1 or 2 . Each of the ironing portions is a bracket that can be rotated around a common axis parallel to the seal longitudinal direction at both ends in the seal longitudinal direction with respect to the horizontal seal portions, and orthogonal to the axis with respect to each of the brackets. A squeezing arm that is slidably held along a related axis and functions as the second cam follower, a squeezing bar as the squeezing member disposed by connecting the leading ends of the squeezing arms, and The vertical packaging machine provided with the ironing device according to claim 3 , further comprising spring means for urging the ironing arm toward the second cam mechanism with respect to the bracket. The movable cam plate includes an engaging portion that contacts the ironing arm and moves the ironing member rearward from the tubular packaging material when the movable cam plate is switched to move to the other position. Item 5. A vertical packaging machine including the ironing device according to any one of Items 1 to 4 . The vertical packaging machine is arranged inside the cylindrical packaging material and is filled with a filling cylinder into which a product to be packaged is charged, and feeds the cylindrical packaging material in the vertical direction along the outer peripheral surface of the filling cylinder. A vertical packaging machine provided with the ironing device according to any one of claims 1 to 5 , which is a vertical bag-filling and packaging machine provided with a feeding mechanism.

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