JP5999931B2 - Horizontal sealing device for packaging machine - Google Patents

Description

  The present invention relates to a lateral sealing device of a packaging machine, and more particularly, to a packaging machine in which a packaging material to be conveyed is formed into a cylindrical shape and filled with an article to be packaged and then laterally sealed by an ultrasonic sealing mechanism. The present invention relates to a lateral seal device.

  Patent Document 1 (WO2007 / 012917A1) discloses a sealing device that laterally seals a packaging material by an ultrasonic sealing mechanism. In this sealing device, an ultrasonic horn and an anvil are attached to each of a pair of rotating bodies, and the tubular packaging material is sandwiched along a direction intersecting the conveying direction while the horn and the anvil rotate. Ultrasonic seal.

  Of the rotating horn and anvil, a plurality of vibrating elements are connected to the horn side, and power is supplied to each vibrating element from the non-rotating side. However, Patent Document 1 has no detailed description on this point.

  An object of the present invention is to provide a lateral sealing device of a packaging machine that can supply electric power to both poles of a plurality of vibration elements from the non-rotating side by an inexpensive method.

A lateral sealing device for a packaging machine according to a first aspect of the present invention is a packaging machine that performs lateral sealing by sandwiching a packaging material in a direction intersecting a transport direction while a horn and an anvil for ultrasonic sealing are swung. It is a horizontal sealing device, and includes a pair of rotating bodies, a plurality of vibration elements, a fixing member, and a plurality of transformers. A horn and an anvil are disposed on the pair of rotating bodies. The plurality of vibration elements are connected to the horn and transmit vibration energy to the horn. The fixing member is disposed in the vicinity of a node of ultrasonic vibration of the resonator of the horn unit including the horn, the plurality of vibration elements, and the resonator, and fixes the horn unit to the rotating body. The plurality of transformers are attached to a rotating body on which the horn is disposed, and supply a driving voltage to each of the plurality of vibration elements.

  In this horizontal sealing device, for example, power is supplied to all of the plurality of vibration elements connected to the secondary side by supplying power to the primary windings of the plurality of transformers via one two-pole slip ring. Therefore, the pole of the slip ring is reduced, and a low cost lateral seal device is realized.

  Further, since the fixing member fixes the horn unit to the rotating body in the vicinity of the ultrasonic vibration node of the resonator, the space occupied by the fixing member behind each vibration element is small, and the increase in size of the device is suppressed. .

  A horizontal sealing device for a packaging machine according to a second aspect of the present invention is a horizontal sealing device for a packaging machine according to a first aspect, in which power supply to primary windings of a plurality of transformers is performed via slip rings. Done.

  In this horizontal seal device, electric power can be supplied to the primary windings of a plurality of rotating transformers from the non-rotating side with a simple configuration.

  The horizontal sealing device of the packaging machine according to the third aspect of the present invention is the horizontal sealing device of the packaging machine according to the second aspect, and primary windings of a plurality of transformers are connected in series.

  In this horizontal sealing device, since the primary windings of a plurality of transformers are connected in series, the object to be supplied with power from the non-rotating side is two poles, and can be handled with only one two-pole slip ring.

  The lateral sealing device of the packaging machine according to the fourth aspect of the present invention is the lateral sealing device of the packaging machine according to the second aspect, wherein the slip ring is a mercury slip ring.

  In this horizontal sealing device, the mercury type slip ring is maintenance-free and inexpensive as well as being compatible with high speed rotation in comparison with the one using a brush type slip ring, so that it is easy to use.

  In the horizontal sealing device of the present invention, for example, by supplying power to the primary side windings of a plurality of transformers through one bipolar slip ring, power is supplied to all of the plurality of vibration elements connected to the secondary side. Since it can supply, the pole of a slip ring is reduced and a low-cost lateral seal device is realized.

The perspective view of the packaging machine 1 which concerns on one Embodiment of this invention. The perspective view which shows schematic structure of the bag making packaging unit 5 of a packaging machine. FIG. 4 is a side view of the lateral seal mechanism 17. Side view of the trajectory of the horn and anvil. The perspective view of the 1st rotary body 50a and the 2nd rotary body 50b. The perspective view of the 1st horn 51a attached to the 1st rotary body 50a and its peripheral member. Sectional drawing of the horn unit 51 along the major axis of the resonator 513. FIG. The perspective view of the transformer mounting part of the 1st rotary body 50a. The schematic diagram of the electrical connection state of the 1st slip ring 101 by the side of the 1st rotary body 50a, the three transformers 111, and the three vibration elements 511. FIG. The schematic diagram of the electrical connection state of the 1st slip ring 101 by the side of the 1st rotary body 50a in the 1st modification, the three transformers 111, and the three vibration elements 511. FIG. The schematic diagram of the electrical connection state of the 1st slip ring 101 by the side of the 1st rotary body 50a in the 2nd modification, the three transformers 111, and the three vibration elements 511. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Configuration of Packaging Machine 1 FIG. 1 is a perspective view of a packaging machine 1 according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic configuration of the bag making and packaging unit 5 of the packaging machine. 1 and 2, the packaging machine 1 includes a combination weighing machine 2, a bag making and packaging unit 5, and a film supply unit 6.

  The combination weighing machine 2 weighs the packages and discharges them to a predetermined total weight. The bag making and packaging unit 5 is a main body portion that packs a packaged item. The film supply unit 6 supplies the film F that becomes a bag to the bag making and packaging unit 5.

  Further, operation switches 7 are disposed on the front surface of the bag making and packaging unit 5. A touch panel display 8 indicating an operation state is disposed at a position where an operator who operates the operation switches 7 can visually recognize.

  The combination weighing machine 2, the bag making and packaging unit 5, and the film supply unit 6 are controlled according to operations and settings input from the operation switches 7 and the touch panel display 8. The operation switches 7 and the touch panel display 8 are connected to a control unit (not shown) composed of a CPU, a ROM, a RAM, and the like, and the control unit controls the combination weighing machine 2 and the bag making and packaging unit 5. Necessary information is fetched from various sensors installed in and used in various controls.

(2) Detailed configuration (2-1) Combination weighing machine 2
The combination weighing machine 2 is arranged at the upper part of the bag making and packaging unit 5, and after weighing the product C with a weighing hopper, these weighing values are combined so as to have a predetermined total weight and sequentially discharged.

(2-2) Film supply unit 6
The film supply unit 6 is a unit that supplies a sheet-like film F to the forming mechanism 13 of the bag making and packaging unit 5, and is provided adjacent to the bag making and packaging unit 5. A roll around which the film F is wound is set in the film supply unit 6, and the film F is fed out from this roll.

(2-3) Bag making and packaging unit 5
The bag making and packaging unit 5 includes a forming mechanism 13, a pull-down belt mechanism 14, a vertical sealing mechanism 15, a horizontal sealing mechanism 17, and a horizontal driving mechanism 55.

  The forming mechanism 13 forms the film F sent in a sheet shape into a cylindrical shape. The pull-down belt mechanism 14 conveys a tubular film F (hereinafter referred to as a tubular film Fm) downward. The vertical sealing mechanism 15 seals the overlapping portion (joint) of the tubular film Fm in the vertical direction.

  The horizontal sealing mechanism 17 seals the upper and lower ends of the bag by sealing the tubular film Fm in the horizontal direction. The lateral drive mechanism 55 reciprocates the lateral seal mechanism 17.

  These mechanisms are supported by the support frame 12. The periphery of the support frame 12 is covered with a casing 9.

(2-3-1) Molding mechanism 13
The forming mechanism 13 includes a tube 13b and a former 13a. The tube 13b is a cylindrical member, and the upper and lower ends are open. The product C measured by the combination weighing machine 2 is put into the opening at the upper end of the tube 13b. The former 13a is disposed so as to surround the tube 13b. The sheet-like film F fed out from the film roll is formed into a cylindrical shape when passing between the former 13a and the tube 13b. The tube 13b and the former 13a of the forming mechanism 13 can be replaced according to the size of the bag to be manufactured.

(2-3-2) Pull-down belt mechanism 14
As shown in FIG. 2, the pull-down belt mechanism 14 is a mechanism that sucks and continuously conveys the tubular film Fm wound around the tube 13b, and belts 14c are provided on both the left and right sides of the tube 13b. ing. In the pull-down belt mechanism 14, a belt 14c having a suction function is rotated by the driving roller 14a and the driven roller 14b to carry the tubular film Fm downward. In FIG. 2, a roller drive motor that rotates the drive roller 14a and the like is not shown.

(2-3-3) Vertical seal mechanism 15
The vertical sealing mechanism 15 is a mechanism that vertically ultrasonically seals an overlapping portion (joint) of the tubular film Fm wound around the tube 13b against the tube 13b with a constant pressure. The vertical seal mechanism 15 is located on the front side of the tube 13b, and is also provided with a drive device (not shown) for moving closer to or away from the tube 13b.

(2-3-4) Horizontal seal mechanism 17
FIG. 3 is a side view of the lateral seal mechanism 17. FIG. 4 is a side view of the trajectory between the horn and the anvil. In FIG. 4, the horizontal seal mechanism 17 has a first rotating body 50a and a second rotating body 50b. In addition, let the one located in the left side of the cylindrical film Fm in FIG. 3 be the 1st rotary body 50a, and let the one located in the right side be the 2nd rotary body 50b.

  A first horn 51a for ultrasonic sealing is attached to the first rotating body 50a, and a first anvil 51b for ultrasonic waves is attached to the second rotating body 50b, and the first horn 51a and the first anvil 51b are connected to each other. The cylindrical film Fm is sandwiched while being swung in a D-shape (for example, refer to the locus of the horn and anvil indicated by the dotted line in FIG. 4).

  Three vibration elements 511 (see FIG. 5) are connected to the first horn 51a so as to be aligned in the sealing direction, and the sealing surface of the first horn 51a vibrates by the three vibration elements 511, and the first horn 51a A part of the tubular film Fm sandwiched between the horn 51a and the second anvil 52a is sealed.

  Further, the second anvil 52a is disposed at a position 180 degrees away from the first horn 51a around the rotation axis of the first rotating body 50a, and 180 degrees away from the first anvil 51b around the rotation axis of the second rotating body 50b. The second horn 52b is disposed at the position.

  Three vibration elements 521 (see FIG. 5) are also connected to the second horn 52b so as to be aligned in the sealing direction, and the sealing surface of the second horn 52b vibrates by the three vibration elements 521, and the second horn 52b A part of the tubular film Fm sandwiched between the horn 52b and the second anvil 52a is sealed.

  In addition, the quantity of each of the vibration element 511 and the vibration element 521 is not limited to three, and if the width of each of the first horn 51a and the second horn 52b is narrow, it may be composed of two. It is.

  Moreover, as shown in FIG. 4, the film detection sensor 59 is arrange | positioned in the place fixed separately from the 1st horn 51a and the 1st anvil 51b. As the film detection sensor 59, a photoelectric sensor, an ultrasonic sensor, or the like is applied.

  The film detection sensor 59 does not necessarily have to be disposed at a fixed location separately from the first horn 51a and the first anvil 51b, and may be disposed on the first horn 51a side and the first anvil 51b side, respectively. Good. At that time, the film detection sensor 59 and the sensor signal receiver are mounted on the structure supporting the first horn 51a and the structure supporting the first anvil 51b, respectively.

  In the sealing stage by the first horn 51a and the first anvil 51b, the presence or absence of the tubular film Fm is confirmed immediately before entering the pressurizing operation. When it is determined from the sensor signal of the film detection sensor 59 that there is no cylindrical film Fm, the turning is performed while the gap between the first horn 51a and the first anvil 51b is maintained. Therefore, the situation where the 1st horn 51a and the 1st anvil 51b are damaged by contact is avoided.

  Although not shown in FIG. 4, the film detection sensor 59 and the sensor signal receiver are also mounted on the structure supporting the second horn 52b and the structure supporting the second anvil 52a. Thus, a situation in which the second horn 52b and the second anvil 52a are damaged by contact is avoided.

  The first rotating body 50a and the second rotating body 50b are rotated about the axes C1 and C2 by a drive motor (not shown). That is, the first horn 51a and the second anvil 52a rotate around the axis C1, and the first anvil 51b and the second horn 52b rotate around the axis C2.

  In FIG. 3, the first rotating body 50a is supported by the first horizontal moving plate 61a, and the second rotating body 50b is supported by the second horizontal moving plate 61b. The first horizontal moving plate 61a and the second horizontal moving plate 61b are brought close to or away from each other by the lateral drive mechanism 55 shown in FIG. The lateral drive mechanism 55 includes a ball screw 80a, a first nut 81, a second nut 82, a third connecting rod 85, and a fourth connecting rod 86.

  The ball screw 80a is rotated by a servo motor 80 (see FIG. 3). The first nut 81 and the second nut 82 are screwed into the ball screw 80a. The pair of third connecting rods 85 is provided along the moving direction of the first horizontal moving plate 61a and the second horizontal moving plate 61b. The fourth connecting rod 86 is provided in parallel with the third connecting rod 85.

  The tip of the third connecting rod 85 is fixed to the side end surface of the second horizontal movement plate 61b. In addition, the 3rd connection rod 85 has penetrated the 1st horizontal displacement board 61a slidably. The tip of the fourth connecting rod 86 is fixed to the side end surface of the first horizontal moving plate 61a.

  Further, in the ball screw 80a, a portion where the first nut 81 is screwed and a portion where the second nut 82 is screwed are mutually reverse screws.

  When the ball screw 80a is rotated by the lateral driving mechanism 55, the first horizontal moving plate 61a and the second horizontal moving plate 61b can be brought close to or separated from each other.

  Note that another first horizontal movement plate 62a is provided at a position away from the first horizontal movement plate 61a by a predetermined distance in the direction perpendicular to the paper surface of FIG. 3, and performs the same operation as the first horizontal movement plate 61a. To do. Similarly, another second horizontal movement plate 62b is provided at a position away from the second horizontal movement plate 61b by a predetermined distance in the direction perpendicular to the paper surface of FIG. 3, and the same operation as the second horizontal movement plate 61b is performed. To do.

(3) Detailed configuration of the lateral seal mechanism 17 (3-1) First rotating body 50a and second rotating body 50b
FIG. 5 is a perspective view of the first rotating body 50a and the second rotating body 50b. In FIG. 5, the first rotating body 50 a includes a turning shaft 94 and a turning shaft 95 that rotate about the turning center C <b> 1, a lever 91 d and a lever 92 d that are rotatably supported by the turning shaft 94, and a turning shaft 95. The lever 91e and the lever 92e are supported so as to be relatively rotatable.

  The first horn 51a is supported at one end by the tip of the lever 91d and at the other end by the tip of the lever 91e, and rotates together when the lever 91d and the lever 91e rotate around the turning center C1.

  The second anvil 52a is supported at one end by the tip of the lever 92d and at the other end by the tip of the lever 92e, and rotates together when the lever 92d and the lever 92e rotate about the turning center C1.

  The second rotating body 50 b is rotatable relative to the pivot shaft 97, the pivot shaft 96 and the pivot shaft 97 that rotate about the pivot center C <b> 2, the lever 91 f and the lever 92 f that are rotatably supported on the pivot shaft 96, and the pivot shaft 97. The lever 91g and the lever 92g are supported by each other.

  The first anvil 51b is supported at one end by the tip of the lever 91f and at the other end by the tip of the lever 91g, and rotates together when the lever 91f and the lever 91g rotate around the turning center C2.

  The second horn 52b is supported at one end by the tip of the lever 92f and at the other end by the tip of the lever 92g, and rotates together when the lever 92f and the lever 92g rotate around the turning center C2.

  The first horn 51a extends longer than the width dimension of the tubular film Fm, and is connected so that three vibration elements 511 are arranged along the sealing direction, and is sandwiched between the first horn 51a and the first anvil 51b. The tubular film Fm is ultrasonically sealed by the vibration of the first horn 51a.

  The second horn 52b extends longer than the width dimension of the tubular film Fm, and the three vibration elements 521 are connected so as to be aligned along the sealing direction, and are sandwiched between the second horn 52b and the second anvil 52a. The cylindrical film Fm thus prepared is ultrasonically sealed by the vibration of the second horn 52b.

  Further, the turning shaft 94 is on the first horizontal moving plate 61a, the turning shaft 95 is on the first horizontal moving plate 62a (the back side in FIG. 3), the turning shaft 96 is the second horizontal moving plate 61b, and the turning shaft 97 is the second. It is pivotally supported on the horizontal moving plate 62b (the back side in FIG. 3). Then, the horizontal drive mechanism 55 shown in FIG. 3 causes the first horizontal movement plates 61a and 62a to move in the same manner, and the second horizontal movement plates 61b and 62b move in the same manner.

(3-2) Attachment Structure of First Horn 51a and Second Horn 52b FIG. 6 is a perspective view of the first horn 51a attached to the first rotating body 50a and its peripheral members. In FIG. 6, a first horn 51a, three vibration elements 511, and four columnar resonators 513 are assembled as one unit. For convenience of explanation, this unit is referred to as a horn unit 51.

  The three vibration elements 511 are connected behind the first horn 51a so as to be arranged at equal intervals along the seal direction. The resonator 513 is connected to the first horn 51a at an adjacent position so as to sandwich the vibration element 511 from both sides.

  FIG. 7 is a cross-sectional view of the horn unit 51 along the long axis of the resonator 513. In FIG. 7, in this embodiment, a node of ultrasonic vibration is located at the center of the long axis direction of the resonator 513, and the first horn is fixed by holding the vicinity of this node and fixing the first rotating body 50a. The stable drive of 51a is realized.

  Specifically, a flange 513a protrudes in a radial direction from a node position of ultrasonic vibration on the outer periphery of the resonator 513, and the horn unit 51 is fixed to the first rotating body 50a via the flange 513a.

  The flange 513a is sandwiched by the packing 531 from the side surface direction. Further, the flange 513 a and the packing 531 are covered with a block 533. The outer peripheral surface of the block 533 is sandwiched from above and below by the holding portion 515. Further, a holding portion 515 faces one side of the block 533 and a holding plate 519 faces the other, and the holding portion 515 and the holding plate 519 are screwed so as to sandwich the block 533 from both sides. .

  Further, the holding portion 515 is screwed to the fixing portion 517. The fixing part 517 is a plate-like member, and the holding part 515 is screwed to the rear end of the fixing part 517. Note that the rear end of the fixing portion 517 is an end farther from the first horn 51a.

  In the present embodiment, the flange 513a and the holding portion 515 are connected via the packing 531 and the block 533, but are not limited to this configuration. For example, without the packing 531 and the block 533 interposed, the outer peripheral surface of the flange 513a is sandwiched from above and below by the holding portion 515, the holding portion 515 is opposed to one of both surfaces of the flange 513a, and the holding plate 519 is opposed to the other. It is also possible to employ a configuration in which the holding portion 515 and the holding plate 519 are screwed so that the flange 513a is sandwiched from both sides.

  For convenience of explanation, the resonator 513, the holding portion 515, and the fixing portion 517 are collectively referred to as a fixing member 510. 5 and FIG. 6, the fixing portion 517 is removed from the fixing member 510, so the specific shape should be referred to the second rotating body 50 b side in FIG. 5.

  As shown in FIGS. 5 and 7, the fixing member 510 holds the horn unit 51 in the vicinity of the node of the ultrasonic vibration at both the front side and the rear side in the rotation direction, and the first rotary body 50 a and the second rotary body. It fixes to each 50b. Therefore, the space occupied by the fixing member 510 behind each vibration element is small, and the increase in size of the device is suppressed.

  In general, the length of the vibration element 511 is not arbitrarily changed because it corresponds to the wavelength for vibrating the first horn 51a. Therefore, in order to ensure the necessary power, the length of the vibration element 511 is increased, and the lateral sealing device tends to be enlarged. In particular, when two pairs of horns and anvils are alternately ultrasonically sandwiched with the tubular film Fm interposed therebetween for the purpose of increasing productivity (transverse seal speed), the apparatus is further increased in size.

  In the present embodiment, as already described, the second anvil 52a is arranged around the rotation axis of the first rotator 50a at a position 180 ° away from the first horn 51a, and the second anvil 52a is arranged around the rotation axis of the second rotator 50b. A second horn 52b is disposed at a position 180 ° away from the one anvil 51b. As a result, since a horn with a large occupied space and an anvil with a small occupied space are arranged on one rotating body so as to supplement each other, the size of the apparatus is suppressed.

  The first horn 51a and the first anvil 51b, or the second horn 52b and the second anvil 52a approach while turning, and the turning direction with the tubular film Fm sandwiched from the position sandwiching the tubular film Fm. The cylindrical film Fm is laterally sealed by proceeding linearly along the direction and then swivel away from each other. Since this operation ensures a certain sealing time, the sealing is surely performed.

  Further, as shown in FIG. 4, the first horn 51a and the first anvil 51b, or the second horn 52b and the second anvil 52a start from the turning motion to the linear motion at a point where the tubular film Fm is sandwiched. A so-called D motion is performed in which the motion is converted and converted from a linear motion to a turning motion at a point away from the tubular film Fm.

  In the first rotating body 50a of the present embodiment, the first horn 51a is supported by a bearing mechanism so that one end can swing freely at the tip of the lever 91d and the other end can be swung at the tip of the lever 91e. The second anvil 52a is also supported by the bearing mechanism so that one end can swing freely at the tip of the lever 92d and the other end can be swung at the tip of the lever 92e.

  Similarly, in the second rotating body 50b, the first anvil 51b is supported by a bearing mechanism so that one end of the first anvil 51b swings freely on the tip of the lever 91f and the other end on the tip of the lever 91g. The second horn 52b is also supported by the bearing mechanism so that one end can swing freely at the tip of the lever 92f and the other end can be swung at the tip of the lever 92g.

  As a result, the sealing surfaces of the first horn 51a and the first anvil 51b can be configured as a plane, and the sealing surfaces of the second horn 52b and the second anvil 52a can be configured as a plane.

  Note that the shake of the first horn 51a and the second horn 52b is amplified at the rear end of the fixing member 510, but a space sufficient to allow the shake is secured around the first rotator 50a and the second rotator 50b. Therefore, interference with other parts is prevented.

(3-3) Power Supply Unit A first slip ring 101 is provided on the extension of the turning center C1 of the first rotating body 50a. A second slip ring 102 is also provided on the extension of the turning center C2 of the second rotating body 50b.

  The first slip ring 101 and the second slip ring 102 are conductive rotating rings that continuously electrically connect the rotating conductor and the fixed conductor, and the first slip ring 101 is the first rotating body 50a. The second slip ring 102 supplies power to the vibration element 521 that rotates together with the second rotating body 50b.

  In general, when power is supplied to multiple vibrating elements via slip rings, a slip ring that can handle multiple poles is required to supply power to both poles of each vibrating element. Only two-pole type of mercury type slip rings that can handle high pressure and high speed exist.

  Therefore, in the present embodiment, the three transformers 111 are mounted on the first rotating body 50a, and the transformer 111 is interposed between the first slip ring 101 and each vibration element 511. Then, primary windings of the three transformers 111 are connected in series to form two poles, and electric power is supplied thereto through a two-pole type first slip ring 101. On the secondary side, the vibration element 511 is made to correspond to each winding, and an independent drive voltage is supplied.

  FIG. 8 is a perspective view of the transformer mounting portion of the first rotating body 50a. In FIG. 8, three transformers 111 are held by a plate-like transformer holder 121. An arm 131 extends in parallel with the turning center C <b> 1 from the center of each of the opposing long sides of the transformer holder 121. The ends of the two arms 131 are fixed so as to sandwich the plate-shaped slip ring holder 141 from both ends. The slip ring holder 141 is provided with a hole concentric with the turning center C1 in advance, and the first slip ring 101 of the hole is held. With such a configuration, power is supplied to the three transformers 111 that rotate via the first slip ring 101 from the non-rotating side.

  The configurations of the second slip ring 102, the three transformers 112, the transformer holder 122, the arm 132, and the slip ring holder 142 on the second rotating body 50b side are the same as those on the first rotating body 50a side, and thus description thereof is omitted. To do.

  FIG. 9 is a schematic diagram of an electrical connection state of the first slip ring 101, the three transformers 111, and the three vibration elements 511 on the first rotating body 50a side. As shown in FIG. 9, since the primary side windings of the plurality of transformers 111 are connected in series, the target to be supplied with electric power from the non-rotating side becomes two poles, that is, one two-pole slip ring, that is, the first Only the slip ring 101 can be used. The configuration of the second slip ring 102, the three transformers 112, and the three vibration elements 521 on the second rotating body 50b side is the same as that on the first rotating body 50a side, and thus the description thereof is omitted.

(3-4) Cutting mechanism The cutting mechanism is constituted by a cutter 72 provided at the tip of the first anvil 51b and the second anvil 52a and a slide groove 73 provided in the first horn 51a and the second horn 52b. Has been. The cutter 72 is advanced toward the slide groove 73 by a driving mechanism such as an air cylinder in accordance with the timing for sealing the tubular film Fm. At this time, since the cutter 72 is pressed substantially at the center position in the width direction of the seal portion, the sealed portion is cut. As a result, the bags are divided one by one and discharged to the chute conveyor 19 (see FIG. 1).

(4) Operation of Packaging Machine 1 Hereinafter, a series of operations of the packaging machine 1 will be described. The articles to be packaged (hereinafter referred to as “product C”) weighed by the combination weighing machine 2 are sequentially dropped onto the upper opening end of the tube 13b. At this time, the outer periphery of the tube 13b is covered with a tubular film Fm for wrapping the product C.

  The product C passes through the tube 13b and is discharged from the lower opening end of the tube 13b. Below the lower opening end, the first horn 51a and the first anvil 51b are laterally sealed in advance with the tubular film Fm interposed therebetween, and the upper portion of the bag and the bottom portion of the subsequent bag are formed.

  The product C is filled in a cylindrical film Fm that is waiting with its bottom sealed, and the first horn 51a and the first anvil 51b are laterally sealed across the top, and the top of the bag and the bottom of the subsequent bag Form. The center of the horizontal seal portion is cut immediately after the seal, and the bag filled with the product C is completed.

(5) Features (5-1)
In the horizontal sealing mechanism 17, the first horn 51a and the first anvil 51b and the second horn 52b and the second anvil 52a are swung to sandwich the tubular film Fm along the direction intersecting the transport direction, and an ultrasonic seal is sandwiched. Do. The 1st horn 51a is attached to the 1st rotary body 50a in the state in which the some vibration element 511 was connected. The 2nd horn 52b is attached to the 2nd rotary body 50b in the state in which the some vibration element 521 was connected. Furthermore, a plurality of transformers 111 are attached to the first rotating body 50a, and a driving voltage is supplied to each of the plurality of vibration elements 511. Similarly, a plurality of transformers 112 are attached to the second rotating body 50b, and a driving voltage is supplied to each of the plurality of vibration elements 521.

(5-2)
Note that, on the first rotating body 50a side, the primary windings of the plurality of transformers 111 are connected in series, so that the target to be supplied with electric power from the non-rotating side becomes two poles, and one two-pole first Only the slip ring 101 can be used. Similarly, on the second rotating body 50b side, the primary windings of the plurality of transformers 112 are connected in series, so that the target to be supplied with power from the non-rotating side becomes two poles, and one two-pole first Only two slip rings 102 can be used.

  For this reason, in this lateral seal mechanism 17, power is supplied to all of the plurality of vibration elements connected to the secondary side by supplying power to the primary side windings of the plurality of transformers via one bipolar slip ring. Can be supplied. Therefore, the pole of the slip ring is reduced and the cost is low.

(5-3)
Since the first slip ring 101 and the second slip ring 102 are mercury-type slip rings, the mercury-type slip ring is maintenance-free and inexpensive in comparison with those using a brush-type slip ring, and also supports high-speed rotation. It is possible and easy to use.

(6) Modifications Here, in the above embodiment, the primary windings of the plurality of transformers 111 are connected in series, but the present invention is not limited to this. Other connection examples will be described below with reference to the drawings.

(6-1) First Modification FIG. 10 is a schematic diagram of an electrical connection state of the first slip ring 101, the three transformers 111, and the three vibration elements 511 on the first rotating body 50a side in the first modification. It is. In FIG. 10, the wiring extending from one pole of the slip ring 101 branches in parallel as three branch wirings from the middle, and the primary winding of the transformer 111 is connected between the branch point and one input terminal of the vibration element 511. And a capacitor 113 are connected in series. The secondary windings of the three transformers 111 are connected in series. The other input terminal of the vibration element 511 is connected to the other pole of the slip ring 101.

(6-2) Second Modification FIG. 11 is a schematic diagram of an electrical connection state of the first slip ring 101, the three transformers 111, and the three vibration elements 511 on the first rotating body 50a side in the second modification. It is. In FIG. 11, the wiring extending from one pole of the slip ring 101 branches in parallel as three branch wirings from the middle. A capacitor 115 is connected in series between the pole and the branch point. Further, the primary winding of the transformer 111 is connected in series between the branch point and one input terminal of the vibration element 511. Others are the same as those of the first modification.

  The difference from the first modification is that the three capacitors 113 in the first modification are replaced with one capacitor 115 in the second modification. Therefore, the capacity of the capacitor 115 corresponds to three times the capacity of the capacitor 113. The capacitor 115 is provided on the rotating side, but may be provided on the non-rotating side.

  As described above, according to the present invention, power is supplied to a plurality of vibration elements mounted on one rotating body through only one slip ring, so that the apparatus does not increase in size and is low in cost. is there. Therefore, it is useful not only for the horizontal sealing device of a packaging machine but also for power supply or signal transmission to a rotating object equipped with a plurality of electric actuators.

17 Horizontal seal mechanism 50a First rotating body 50b Second rotating body 51a First horn 51b First anvil 52a Second anvil 52b Second horn 101 First slip ring 102 Second slip ring 111, 112 Transformer 511 Vibration element 521 Vibration element

WO2007 / 012917A1

Claims (4)

A transverse sealing device for a packaging machine that performs transverse sealing by sandwiching a packaging material in a direction intersecting the conveying direction while a horn and an anvil for ultrasonic sealing are turned,
A pair of rotating bodies in which the horn and the anvil are disposed;
A plurality of vibration elements coupled to the horn and transmitting vibration energy to the horn;
A fixing member disposed in the vicinity of a node of ultrasonic vibration of the resonator of the horn unit including the horn and the plurality of vibration elements and the resonator, and fixing the horn unit to the rotating body;
A plurality of transformers that are attached to the rotating body where the horn is disposed, and that supply a driving voltage to each of the plurality of vibration elements,
Comprising
Horizontal sealing device for packaging machines. Power supply to the primary winding of the plurality of transformers is performed via a slip ring,
The horizontal sealing device of the packaging machine according to claim 1. Primary windings of the plurality of transformers are connected in series.
The horizontal sealing device of the packaging machine according to claim 2. The slip ring is a mercury slip ring,
The horizontal sealing device of the packaging machine according to claim 2.

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