JP4159521B2 - Method and apparatus for opening bag in rotary bag filling and packaging machine - Google Patents

Description

  The present invention relates to a method and an apparatus for opening a wrapping bag provided with folding folds, that is, gussets on both side surfaces, in a rotary bagging and packaging machine.

  This type of sachet has vertical folding folds called gussets on both sides for the purpose of expanding the opening area more than a flat bag. Although it is a location, the bag has four side edges at four corners. Therefore, the support of the seed bag in the packaging machine, as described in the following document 1, is supported by sucking and supporting one surface of the package bag with a vacuum sucker, and holding both side edges of the other surface with two clamps. It is the structure to do.

  And the opening is made by separating the vacuum sucker that adsorbs one surface and the two clamps that sandwich the other side edges, but the supporting force of the wrapping bag by the vacuum sucker is also physically clamped It is weaker than that of the above, and there is a drawback that when the gravity of the packaged material acts on the wrapping bag, the wrapping bag slides down from the vacuum sucker.

  Compared to that, in the following document 2, a total of four clamps, two on each side, are opened and waited, and the four corners of the gusset bag are inserted into the respective clamps from the lower area, and each of the wrapping bags is powerfully attached to each clamp. A technique for clamping the side edges of the four corners is disclosed. However, when the gusset bag is inserted into the four clamps, this type of gusset bag having a large opening area is likely to cause trouble due to the corresponding air resistance.

  In other words, in a gusset bag made of a soft film and opened, the folded folds are easy to twist due to air resistance, and the rim of the wrapping bag is likely to come into contact with each clamp when inserted between the clamps. If an attempt is made to solve the above problem by reducing the supply speed of the bag, there arises a problem that the original efficiency function of the rotary packaging machine is lowered.

  In addition, in the clamp arrangement structure in which the four corners of the gusset bag are clamped by four clamps, the clamp intervals on both sides are large, and after opening the mouth of the gusset bag with these clamps to fill the package When the gap between the clamps is reduced to narrow the bag mouth and heat sealing is performed with the seal bar, the bag mouth is not further narrowed due to the presence of the clamps sandwiching the four corners, and there is a problem in that a seal shift occurs.

Japanese Utility Model Publication No. 55-23931 Japanese Utility Model Publication No. 55-90506

  Therefore, the problem to be solved by the present invention is that the supply from the lower side of the gusset bag is avoided and the bag can be supplied horizontally from the front, thereby preventing the seal slip and at the same time improving the efficiency of the rotary packaging machine. More specifically, in the case of four clamp arrangements, when supplying the wrapping bag from the front, at least the two front-side clamps obstruct the supply of the wrapping bag. The space between the two clamps is widened to allow the bag to pass.

  The bagging machine includes two upper clamps arranged on both sides of the guide track past the center point of the rotor, and two lower clamps arranged in a lower area of the upper clamp, in each vacuum sucker and the vacuum sucker. The upper and lower clamps are formed with movable claws that approach and move away from each other, and the vacuum suction cups of the upper and lower clamps are arranged so as to face each other with a height difference, and either two of the upper and lower clamps are arranged along the guide track. And a variable configuration that can be moved back and forth.

  Prior to the action of supplying the gusset bag from the front horizontal direction to the clamps temporarily stopped in the bag feeding section of the rotation track of the rotor, the movable claws of the four clamps are opened while the variable The distance between the two clamps of the mold is widened to allow passage of the gusset bag, and then both sides of the gusset bag are sucked by the vacuum suckers of the four clamps.

  Further, the four corners of the gusset bag are sandwiched by the four vacuum suction cups adsorbed on the front and rear surfaces of the gusset bag in the rotational trajectory of the rotor after the bag feeding section and the four movable claws.

With the setting actions such as the vertical drop of the upper and lower clamps, the opening direction of the movable claw, and the retracting movement of the variable clamp, horizontal supply from the front with the gusset bag closed is possible. Since both vacuum front and back sides of the gusset bag can be supported at the same time by four vacuum suction cups, there are fewer mistakes in holding the bag compared to the prior art which only supplies the gusset bag to the four clamps in an open state. The gusset bag can be quickly moved from the feeding section to improve efficiency.

  In the rear area of the section, the four corners of the gusset bag are clamped by the vacuum suction cups and the four movable claws, and then the gusset bag is opened by the displacement of the variable clamp to prepare for filling of the package. Can be arranged.

  FIG. 10 showing a partial side view of the bagging and packaging machine is that the upper fixed clamp 12 is fixed to the guide frame 11 fixed to the lower peripheral edge of the disk-shaped rotor 10 and is slidably supported on the guide frame. The slider 13 is provided with a height difference to support the lower variable clamp 14, while the bag feeding mechanism 15 sandwiches and suspends the gusset bag 16 with respect to the upper and lower clamps 12, 14 with an arrow 17. The structure which supplies horizontally to a direction is shown.

  FIG. 2 shows the sheath-type guide frame 11 described in FIG. 10 from the back side. The long plate-like slider 13 described above is slidably supported by the frame 11 and the rotor 10 is also slidably supported. As shown in FIG. 3, the bell crank 20 is supported on the end of the arcuate bracket 18 fixed to the lower surface via the pin 19, and the pin 21 supported by one end of the bell crank is engaged with the longitudinal slit 22 of the slider 13. .

  One end of an L-shaped link 29 pivotally supported on the upper portion of the bracket 18 and the other end of the bell crank 20 are connected via a connecting rod 23, while the link 29 has the bow shape. The pulley 26 at the end of the lever 25 provided on the support shaft 24 to the bracket 18 is pressed against the upper surface of the annular cam 28 concentrically with the rotor 10 by the force of the spring 27 acting in the direction of pulling the other end of the link 29. To do.

The pulley 26 rolls and moves on the upper surface of the annular cam 28 by the rotation of the rotor 10, but the gradient of the upper surface of the cam 28 acts on the pulley 26 and the levers 20, 25, 29 swing. , the slider 13 reciprocates in the direction of arrow 30, with respect to the fixed clamp 12 fixed to the Oite Gaito frame 11 in FIG. 10, the extrusion variable clamp 14 provided on the slider 13 forward, also the The clamp 14 can be retracted in the reverse direction.

The auxiliary cam 31 disposed inside the annular cam 28 is rotationally displaced independently by the power applied to the annular cam 28 and operates the slider 13 alone under the condition that the rotor 10 is stopped. That is, in other words, the variable clamp 14 shown in FIG. 10 is pushed forward alone and retracted in the reverse direction when the rotor 10 is stopped.

As shown in FIG. 4, two pairs of guide frames 11 already described are installed at a predetermined interval under the rotor 10, and the slider 13 described above is supported on each of the guide frames 11, while A clamp arm 34 is fixed to each of the guide frames 11 with screws 33.

  FIG. 5 is a perspective view of the entire fixed clamp 12 fixed to the guide frame 11 with screws 33, and the clamp arm 34 has a small volume chamber 37 formed at the tip thereof, and a movable claw 35 is formed in the chamber 37. Are pivotally supported by pins 36 so that they face each other.

  As shown in FIGS. 6 and 7, a more detailed structure of the fixed clamp 12 is provided with a suction cup 39 that opens a number of suction holes 38 on the front surface of a chamber 37, and the chamber is connected to a vacuum pump via a tube 40. The gusset bag 16 is sandwiched between the suction cup 39 and the movable claw 35 facing the suction cup 39.

In FIG. 5, one end of a lever 42 supported by a pin 41 on the upper surface of the clamp arm 34 and the movable claw 35 are connected via a link 43, and the attraction force of a coil spring 44 that pulls the other end of the lever 42 together. Thus, the movable claw 35 is pressed against the suction surface of the chamber 37, and the movable claw 35 is separated from the suction cup 37 by the operation force 46 applied to the pin roll 45 at one end of the lever 42 against this pressure contact force (see FIG. 11).

  On the other hand, the variable clamp located below is shown in FIGS. 8 and 9, and the clamp arm 50 can be freely rotated via the vertical pin 49 to the shelf head 48 at the tip of the slider 13 supported by the guide frame 11. The end of the arm 50 is pressed against the stopper 52 installed on the slider 13 and held in position by the pulling force of the torsion coil spring 51 that is supported by the coil 49 and wound around the pin 49. This position holding can be released by applying an operating force 54 acting on the end of the main lever 53 fixed to the lower end of the pin 49 as a reaction force of the bow of the torsion coil spring 51 (see FIG. 12).

A movable claw 57 pivotally supported by a pin 56 to the chamber 55 at the tip of the clamp arm 50 in FIG. 8 and an end of a lever 60 supported by a pin 59 in the middle of the clamp arm 50 are connected via a link 61. The movable claw 57 is pressed against the chamber 55 by the attractive force of the spring 62 that draws the end of the lever 60 . The movable claw 57 is separated from the chamber 55 by the operation power 64 acting on the pin roll 63 at one end of the lever 60 against the pressing force (see FIG. 12).

The chamber 55 in the variable clamp 14 at the lower stage in FIG. 6 is also provided with a suction cup 68 that opens a number of suction holes 67 on the front surface as in the upper chamber 37 already described with reference to FIG. The movable claw 57 is configured to face the suction cup 68 while being connected to the pump.

  As shown in FIG. 1, the fixed clamp 12 fixed to the periphery of the circular rotor 10 has a pair of clamp arms 34 arranged symmetrically on both sides of the guide track 70 passing the center of the rotor 10. In the lower region, the arms 50 of the pair of variable clamps 14 are arranged symmetrically. The rotor 10 is intermittently rotated in the direction of the arrow 71 while being temporarily stopped at 10 sections integrally with the upper and lower clamps 12 and 14 supported at equal intervals at 10 positions on the periphery.

In the case described above, the mechanism 72 arranged on the endless track controls the pressing force against the pin roll 45 that opens the movable claw 35 of the fixed clamp 12 in FIG. The mechanisms 73 and 74 control the opening pressure of the movable claw 37 of the variable clamp 14 and the operation of the clamp.

  Normally, as shown in FIG. 13, the fixed clamp vacuum chamber 37 and the variable clamp vacuum chamber 55 move in a circular orbit while facing each other, but in the supply section of the gusset bag, that is, the bag supply section, as shown in FIG. Corresponding to the supply operation of the gusset bag 16, the two vacuum chambers 55 of the variable clamp are retracted on both sides as the first step (see also FIG. 12), and four pieces are respectively shown in FIG. 15 as the second step. The movable claws 35 and 57 are opened (see also FIGS. 11 and 12), and in the third step, both outer surfaces of the gusset bag 16 are adsorbed to the vacuum suction cups of the vacuum chambers 37 and 55 that are relatively close to each other as shown in FIG. .

  Immediately after the clamp supporting the gusset bag is moved from the bag feeding section, the vacuum chamber 55 of the variable clamp is separated from the vacuum chamber 37 of the fixed clamp as shown in FIG. Since 16 is opened, each movable claw 35, 57 immediately moves in the closing direction to pinch the four corners of the gusset bag.

  As shown in FIG. 1, the overall view is as shown in FIG. 1. Four clamps 12 and 14 sandwich the four corners of the gusset bag 16 and push the variable clamp 14 in the direction of arrow 77 to maximize the gusset bag 16. It becomes possible to fill the packaged object.

In FIG. 7, the movable claws of the variable clamps are not shown for better understanding of the configuration . However, as shown in FIG. 16, the movable claws 35 of the variable clamps are pulled toward the front as viewed from the rotor center side. while the structure to open forward, the other of the fixed mold, a structure in which the two clamps each movable claw 57 is opened in the extrusion direction front side front as viewed from the rotor center side. In order to send the gusset bag filled with the package to the seal section in the rear region, the gusset bag 16 is closed again by bringing the upper and lower clamps 12 and 14 closer to each other as shown in FIG. In this case, since the movable claws 35 and 57 that sandwich the front and rear edges of the bag overlap each other, the thickness of the gusset bag is equivalent to one movable claw when the bag mouth is clamped by the pair of seal bars 78 and 79. It is thinner than the one in which the gusset bag is supported by four flat-level clamps in Patent Document 2, and is effective in eliminating the seal deviation at the time of pinching by both seal bars 78 and 49 .

  When the width of the gusset bag used for packaging is changed according to the application, the screw rod 82 of both screw type in FIG. 4 is rotated to adjust the distance between the guide frames 11. In this case, as shown in FIG. 2, since the guide frame 11 is engaged with the dovetail guide rail 81 on the lower surface of the rotor 10, the guided frame 11 is displaced by the rotation of the screw rod 82. The screw rod 82 and the guide rail 81 constitute a symmetrical displacement motion adjusting mechanism according to the claims.

  The bagging machine shown in the first embodiment is configured to move the clamp along a circular path with a circular rotor. However, as a rotary type bag filling machine, there is a configuration that circulates a clamp supported by an endless chain around two foils along an elliptical orbit, so as a packaging machine for rotary bag filling of the present application, Such a configuration is also assumed. In other words, the rotor described in the claims also means the foil and the endless chain.

Top view of bag clamping clamp Side view of slider operating mechanism Slope view of the previous figure Front view of guide frame Perspective view of fixed clamp Detailed view of vacuum chamber of upper and lower clamps Partial perspective view of the previous figure Perspective view of variable clamp Partial illustration of the previous figure Side view of the entire device Single top view of fixed clamp Single top view of variable clamp Top view showing the arrangement of the upper and lower clamps Top view showing the arrangement of the upper and lower clamps Top view showing the action of the upper and lower clamps Enlarged action diagram of upper and lower clamps

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rotor 11 ... Guide frame 12 ... Upper solid type clamp 13 ... Slider 14 ... Lower movable type clamp 16 ... Gazette bag 37 ... Vacuum sucker 35 ... Moving claw 34, 50 ... Clamp arm 49 ... Pin 51 ... Coil spring 52 ... Stopper 55 ... Vacuum sucker 57 ... Movable claw 70 ... Guide tracks 71, 72 ... Vacuum sucker 80 ... Guide rail (symmetric displacement motion adjustment mechanism)
82 ... Screw rod (symmetric displacement motion adjustment mechanism)

Claims (5)

Oite the guide tracks on both sides past the center point of the rotor, the two fixed clamp arm fixed to the rotor, the other two variable clamping arm so as to be located in upper or lower of the clamp arm A first vacuum sucker that is supported by the rotor so as to be displaceable along the guide track, and that faces away from the center of the rotor at the tip of the fixed clamp, and the first clamp on the variable clamp arm. The second vacuum suction cups that face the vacuum suction cups are respectively installed, and the first vacuum suction cups are further provided with movable claws that move toward and away from each other by rotating a pin about an axis. A movable claw that rotates toward and away from the suction cup around a pin is provided to form a variable clamp.
1. Prior to the action of supplying the gusset bag from the front horizontal direction to the clamps temporarily stopped in the bag feeding section of the rotor rotation trajectory, the movable claws of the clamps on both sides are opposed to each other. While rotating in the direction to separate from each vacuum suction cup, and further expanding the interval between the two clamps of the variable type to a state that allows the passage of the gusset bag, the front and back surfaces of the supplied gusset bag, Adsorbed by the four first and second vacuum suckers,
2. In the rotation trajectory of the rotor after the bag feeding section, four movable claws are brought close to the four vacuum suction cups adsorbed on the front and rear surfaces of the gusset bag, and the four corners of the gusset bag are sandwiched. An apparatus configured to open the gusset bag with a stroke of the variable clamp along both sides of the guide track .   A pair of guide frames arranged in parallel on the guide track are fixed to the rotor, and two fixed clamps are supported on both guide frames, while the sliders are slidably supported on the two guide frames. The two clamps of the mold are pivotally supported through pins so as to be opened and closed in both directions, and the two variable clamps are provided on the slider by the elasticity of a torsion coil spring wound around the pins. The apparatus according to claim 1, wherein the position of the variable clamp is facilitated by pressing the stopper against a position of the stopper and resisting the coil spring.   A pair of guide frames arranged in parallel on the guide track passing through the center point of the rotor are engaged with guide rails in a direction perpendicular to the guide track, and are supported on both guide frames by a symmetrical displacement motion adjusting mechanism. The apparatus according to claim 1, wherein two clamp intervals can be adjusted along the guide rail.   The apparatus according to claim 1, wherein the first vacuum suction surface of the fixed clamp and the second vacuum suction surface of the variable clamp can be matched on the same vertical surface. Two fixed clamps on both sides fixed to the rotor, and two variable clamps arranged in parallel to the rotor so as to be slidable in the direction of the fixed clamps either above or below the two fixed clamps. The gusset bag is supplied from the front horizontal direction between the clamps on both sides in accordance with the timing of reaching the bag feeding section with the rotation of
1. Prior to supplying the gusset bag to the clamp, the movable claw in contact with the first vacuum suction cups in the two fixed clamps is rotated in a direction opposite to the supply movement of the gusset bag. While moving away from the vacuum suction cup 1, the movable claws of the two variable clamps that are in contact with the second vacuum suction cup are rotated in the direction opposite to the opening of the movable claws in the fixed clamp. After separating from the vacuum sucker and expanding the interval between the variable side clamps to a state allowing the passage of the gusset bag, the front and rear surfaces of the gusset bag supplied between the fixed type and variable type clamps are Adsorbed and supported by the vacuum suction cups of the upper and lower clamps,
2. The four movable suction claws are brought close to the four vacuum suction cups adsorbed on the front and rear surfaces of the gusset bag to sandwich the four corners of the gusset bag, and the rotor in the rotational trajectory of the rotor after the bag feeding section. A method of opening the gusset bag with a displacement of a variable clamp.