JP4567506B2 - Bag opening device for rotary bagging and packaging machine - Google Patents

Description

  The present invention relates to an apparatus for opening a wrapping bag provided with folded 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, as a support for this seed bag in the packaging machine, the following Patent Document 1 discloses that a total of four clamps, two on each side, are opened and waited, and the four corners of the gusset bag are placed on the four clamps from below. A technique is disclosed in which the side edges of the four corners of the wrapping bag are strongly clamped by the clamps. 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, the gusset bag formed by a soft film and opened, the folding fold portion is easily twisted by air resistance, and there is a high possibility that the mouth of the wrapping bag contacts each clamp when inserted between each clamp, If an attempt is made to solve the above problem by reducing the supply speed of the packaging bag, the problem arises 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 gusset bag with these clamps to fill the package Further, when the gap between the clamps is reduced to narrow the bag mouth and heat sealing is performed by the seal bar, there is a problem that the bag mouth is not further narrowed due to the presence of the clamps sandwiching the four corners and the seal is displaced.

Japanese Utility Model Publication No. 55-90506

  Accordingly, the problem to be solved by the present invention is that the gusset bag can be supplied to the four clamps for opening from below in a thin state without being affected by wind pressure, and the gusset bag can be supplied even when the bag mouth is sealed. The opening of the bag can be made thin.

  In order to achieve the above object, two upper clamps disposed on both sides of the guide track past the center point of the rotor and supported by the rotor, and two lower clamps disposed below the upper clamp. And each of these clamps is formed by a vacuum sucker and a movable claw that approaches and separates from the vacuum sucker by rotating a pin as an axis, and the vacuum sucker surface of the upper clamp and the lower clamp A rotary bagging machine having a variable configuration in which either one of the four clamps is reciprocally movable along the guide track. When the intermittently rotating clamp temporarily stops in the bag feeding section on the rotor rotation path, the four movable claws are separated between the upper and lower vacuum suction cups. After supplying a gusset bag and adsorbing both side surfaces of the gusset bag to the four vacuum sucker surfaces, opening the gusset bag adsorbed to the vacuum sucker surface by movement of the two variable clamps; After holding the four corners of the gusset bag with the four movable claws, the gusset bag is greatly opened by the further movement of the two variable clamps, and the gusset bag is carried into the filling section of the package. It is comprised so that it may do.

  Prior to the action of supplying a gusset bag from below to each clamp that is temporarily stopped in the bag feeding section of the rotor rotation track, the movable claws of each of the four clamps are released from the vacuum suction surface and separated. The front and rear surfaces of the gusset bag are adsorbed by the vacuum suction surface of the four clamps.

  In the rotational trajectory of the rotor after the bag feeding section, the gusset bag is opened by moving the movable clamp, the front and rear surfaces of the bag are separated, and the four corners of the bag are pulled apart. After being sandwiched between the vacuum suction surfaces, the bag is greatly opened by further movement of the movable clamp. In the case of inserting the four corners of the gusset bag between the four open clamps described in Patent Document 1, the wind pressure received by the bag is large, but the clamp of the present application is supplied from below on the vacuum sucker surface. Since both the front and rear side surfaces are captured, the bag can be supplied in a thin state, and the operation is efficient.

  FIG. 1 which is a perspective view of a part of the clamp shows two clamps on one side, and the upper clamp 12 includes a vacuum sucker 65 at the tip of the clamp arm 34 and a movable claw 35 having a pin 36 as an axis. Is configured to come into contact with and away from the vacuum suction surface 65 due to rotational movement. On the other hand, the lower clamp 14 is also provided with a vacuum suction cup 66 at the tip of the arm 50. The suction cup 66 faces the vacuum suction cup 65 of the upper clamp, and the lower clamp 14 also has a movable claw 57 (not shown). 2) is rotatably installed via a pin 56. By inserting the gusset bag 16 between the vacuum suction cups 65 and 66 from below as indicated by an arrow 67, the suction cups 65 and 66 are adsorbed on both front and rear surfaces of the bag 16 in the direction of the arrow 68 of the lower clamp. Thus, the bag 16 is opened.

  The entire clamp is shown in FIG. 3, and a pair of upper clamps 12 on both sides of the circular rotor 10 are provided on both sides of a guide track 70 past the center of the rotor 10 with a pair of clamp arms 34. It is fixed to the rotor 10. On the other hand, each of the pair of variable clamps 14 is slidably disposed under the both clamps via the arm 50. The rotor 10 sandwiches and opens four corners of the gusset bag 16 as will be described later by the four clamps. However, as shown in FIG. Four clamps are supported, and the clamps rotate intermittently in the direction of the arrow 69 while temporarily stopping at the sections 1 to 8.

  FIG. 5 showing the side surface of the clamp shows an upper fixed clamp 12 fixed to a guide frame 11 fixed to the lower peripheral edge of the rotor 10 formed of a disk and slidable on the guide frame 11. A gusset bag 16 that supports a lower variable clamp 14 on the supported slider 13 with a height difference, is sandwiched between a pair of suction cups 15 and is supplied from below as indicated by an arrow 67, and the upper and lower clamps 12, 14 are provided. It shows the state of support.

  FIG. 6 shows the sheath-shaped guide frame 11 described in the previous figure, and the previously described elongated plate-like slider 13 is slidably supported, and at the end of the arcuate bracket 18 fixed to the lower surface of the rotor 10. As shown in FIG. 7, the bell crank 20 is supported 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 supported by the bracket 18 via a support shaft 24 and the other end of the bell crank 20 are connected via a connecting rod 23, while a lever 25 provided on the support shaft 24. The pulley 26 at the other end is pressed on the upper surface of the annular cam 28 concentric with the rotor 10 by the force of the spring 27 acting in the direction of pulling the other end of the link 29.

  As the rotor 10 rotates, the pulley 26 rolls and moves on the upper surface of the annular cam 28 provided concentrically with the rotor. However, the gradient of the upper surface of the cam 28 acts on the pulley 26 so that the levers 20, 25, When the slider 29 swings, the slider 13 reciprocates in the direction of the arrow 30. In FIG. 3, the variable clamp 14 is pushed forward with respect to the fixed clamp 12 and retracted in the reverse direction. It becomes.

  The auxiliary cam 31 disposed inside the annular cam 28 is rotationally displaced independently by the power applied to itself, and makes the slider 13 reciprocate independently in a state where the rotor 10 is stopped. That is, in FIG. 3, the variable clamp 14 is pushed forward alone when the rotor 10 is stopped, and retracted in the reverse direction.

As shown in FIG. 8, under the rotor 10, as described above, two pairs of guide frames 11 having the sliders 13 are installed at predetermined intervals, and each of these guide frames 11 is provided with screws 33. A fixed clamp arm 34 is fixed, and as shown in FIG. 9, the clamp arm 34 is provided with a small-capacity chamber 37 and a movable claw 35 supported by a pin 36 at its tip. One end of a lever 42 supported by a pin 41 and the movable claw 35 are connected to the upper surface of a clamp arm 34 that supports the upper clamp 12 via a link 43, and the coil spring 44 attracts the other end of the lever 42. The movable claw 35 is pressed against the suction surface of the chamber 37 by force, and the pin at one end of the lever 42 is against this pressing force. The operating force 46 applied to Lumpur 45, the movable claw 35 is to away from the suction cup 37. (In FIG. 5, the pusher 71 acts on the pin roll 45 to open the fixed clamp 12).

  On the other hand, as shown in FIG. 10, the variable clamp 14 positioned below is pivotally supported by a pin 56 in a chamber 55 at the tip of the clamp arm 50 extending from the tip of the slider 13 supported by the guide frame 11. The movable claw 57 is connected to the end of the lever 60 supported by the pin 59 in the middle of the clamp arm 50 via a link 61, and the movable claw 57 is moved by the attraction force of the spring 62 that draws the end of the lever 52. Press contact with the chamber 55. The movable claw 57 is separated from the chamber 55 by the operating power 64 acting on the pin roll 63 at one end of the lever 60 against the pressure contact force. (In FIG. 5, the pusher 72 moved by the bell crank 73 acts on the pin roll 63 to release the lower clamp 14.)

  When the set of four clamps is temporarily stopped in the bag supply section 1 by the rotation of the rotor 10 in FIG. 4, the gusset bags 16 supplied as shown by arrows 67 from below as shown in FIG. The vacuum suction cups 65, 66 are adsorbed and supported. After that, the clamp that sucks and supports the gusset bag 16 starts to rotate from the bag feeding section. In the moving process, as shown in FIG. 11, the displacement of the variable clamp 14 in the arrow direction 90 causes a vacuum. The bag 16 adsorbed in the chambers 37 and 55 is slightly unfolded, and the four corners of the folding fold 77 are held by the movable claws 35 and 57, respectively (see FIG. 2). Such an action during the movement of the clamp can also take place while the clamp is paused in the gripping section 2 in FIG. 1, but before the clamp reaches the rear filling section 3, FIG. The opening of the gusset bag 16 is further enlarged by the movement of the variable clamp 14, and the filling hopper 80 is inserted into the bag mouth in the same section 3 to fill the object to be packaged.

  As the clamp moves from the closing section 5 to the sealing section 6, the mouth of the bag filling the package is closed flat by the displacement of the variable clamp. In this case, by moving 83 the gusset clamping surface 66 of the variable clamp 14 shown in FIG. 2 to a position flush with the clamping surface 65 of the fixed clamp 12, the bag mouth can be gathered thinly and flatly. The pair of seal bars 84 can be heat-sealed by pinching without forming a large ridge in the bag mouth.

    When the width of the gusset bag used for packaging is changed according to the application, the distance between the guide frames 11 and the dovetail guide 81 can be adjusted by rotating both screw-type screw rods 82 in FIG. it can.

  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 filling a rotary bag 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.

Partial perspective view of bag clamping clamp Cross section of previous figure Overall view of the previous clamp Simplified plan view of rotary bagging and packaging machine Clamp side view Illustration of the operation mechanism of the variable clamp Perspective view of the previous figure Front view of FIG. Perspective view of fixed clamp Perspective view of variable clamp Plane action diagram of clamp

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 25 ... Lever 28 ... Ring cam 31 ... Auxiliary cam 37 ... Vacuum chamber 35 ... Moving claw 34, 50 ... Clamp arm 49 ... Pin 51 ... Coil spring 52 ... Stopper 55 ... Vacuum chamber 57 ... Moveable claw 65,66 ... Vacuum suction cup 70 ... Guide track 71,72 ... Vacuum suction cup 81 ... Guide rail 82 ... Screw rod 84 ... Seal bar

Claims (5)

The guide tracks on both sides past the center point of the rotor, the while supporting the rotor, and two upper clamps, said with arranging the two lower clamp the upper clamping under range, vacuum suction cups each of these clamps respectively And a movable claw that rotates toward and away from the vacuum sucker with a pin as an axis, while the vacuum sucker surface of the vacuum sucker in the two upper clamps and the vacuum sucker surface of the vacuum sucker in the lower clamp Are arranged so as to face each other with a height difference, and either one of the four clamps above and below is a fixed type, and the other two are variable types capable of reciprocating along the guide track. Because
When the clamp that rotates integrally with the rotor is temporarily stopped in the bag feeding section in the rotation track of the rotor, between the vacuum sucker surfaces and the four movable claws separated from the vacuum sucker surfaces , The gusset bag is supplied from below, and both side surfaces of the gusset bag are adsorbed to the four vacuum sucker surfaces, and then the two variable clamps are adsorbed to each vacuum sucker surface by moving from the fixed clamp. opening in the gusset bag, further after clamping the four corners of the gusset bag in the vacuum suction surface by four each movable claw of the, by increasing open the gusset bag in a further movement of the two variable clamp A device that carries the gusset bag into the filling section of the package. Two variable clamp is moved from the fixed clamp, while supporting the two clamps respectively fixed to the two guide frames arranged parallel to the rotor, slidably supported on each of the two guide frames Two variable clamps are slidably supported on the slider, and a lever in contact with the annular cam arranged around the central axis of the rotor is swung in accordance with the shape of the annular cam by the rotational movement of the rotor. is allowed, the oscillating motion of the lever apparatus of claim 1 along the guide frame so as to move the variable clamp integrally with the slider. The independent cam of the auxiliary cam installed along the annular cam causes the lever to swing even when the rotor is stopped, and the variable clamp is moved along with the slider along the guide frame . The apparatus of claim 2. The distance between the fixed clamps provided on the two guide frames and the variable clamps is adjusted by engaging the two guide frames with the guide rails formed on the rotor and setting them parallel to the guide rails. The apparatus according to claim 2 or 3, wherein the operation is performed along the guide rail by rotating a screw rod.   2. The apparatus according to claim 1, wherein in the seal section, the vacuum sucker surfaces of the upper and lower clamps having a height difference are aligned on the same surface, and the opening edge of the gusset bag supported by the upper and lower clamps is welded by a pair of seal bars.