JP5911281B2 - Bag opening device - Google Patents

Description

  The present invention relates to a bag opening device, and more specifically to a technique for opening an upper opening of a bag in the middle of conveyance.

  As one of the packaging forms, there is a self-supporting package called a standing pouch or the like. The self-supporting package is excellent in ease of product display and display effect, and has recently been in demand. Some of the self-supporting packages have gussets in which standing side edges are folded inward.

  This type of self-supporting package includes, for example, a bag making process for manufacturing a bag body using a sheet-like packaging film, a bag opening process for receiving the manufactured bag and opening an upper opening, and a bag from the opened opening. Manufactured through a filling process for filling the inside of the body with an article to be packaged such as a snack, and a sealing process for closing and sealing the opened opening. For example, as shown in Patent Document 1 or the like, a bag making and filling machine that performs each process continuously in one of these systems, or a separately manufactured bag shown in Patent Document 2 or the like is received and opened. There is a filling and packaging machine that performs each process after the process.

  And as a bag opening apparatus which performs said bag opening process, patent document 1, 2 is equipped with a pair of adsorption | suction means, makes each adsorption | suction member adsorb | suck hold | maintain on the both outer surfaces of the opening part of a bag, and then a pair of The idea of opening by separating the adsorbing member is disclosed.

  Moreover, as an apparatus which opens the opening part of a bag, there exists a bag opening apparatus disclosed by the "opening method of the package body with a chuck | zipper" of patent document 3, for example. This bag opening device includes a structure that operates so as to move the adsorbing member closer to and away from each other using a rack and a pinion.

  Further, for example, in “Paper mouth opening device for continuously transported bags” in Patent Document 4, a pair of suction members are maintained so that the suction surfaces face each other in order to support a bag that is continuously transported. On the other hand, a rotary mechanism has been disclosed that revolves along a predetermined trajectory (circle) to move forward in accordance with approach / separation and bag transfer.

Japanese Patent Laid-Open No. 2001-72004 JP-A-8-119210 JP 2006-256658 A Japanese Patent No. 4707848

  The device disclosed in Patent Document 3 performs a bag opening process when a bag to be processed is stopped, and is premised on a device that is applied to a system for intermittently transferring a bag. Therefore, it cannot be applied to a system such as a bag making and packaging machine or a filling and packaging machine that performs each process while continuously transferring bags for high speed, productivity, and other reasons.

  Moreover, although the apparatus disclosed by patent document 4 is an apparatus which opens the bag body continuously conveyed, since there are many parts and it becomes large sized, a place is taken, bag making filling packaging machines, filling packaging machines, etc. There are problems such as increasing the overall size of the packaging system and limiting the layout of the apparatus that performs each process.

In order to solve the above-described problems, a bag opening device according to the present invention is (1) a pair of bag opening devices that open an opening of a moving bag body and are arranged along the moving direction of the bag body. A pair of connecting members that are linked to eccentric positions with respect to the pair of rotating bodies and that extend so as to extend toward the movement path of the bag, and at the tips of the connecting members The suction means attached to the pair of connecting members approach each other while maintaining the state in which the suction faces face each other as the pair of rotating members rotate. A line connecting the rotation center of the rotating body , contacting and adsorbing to both outer surfaces of the opening of the bag body, separating while moving forward following the movement of the bag body in the adsorbed state LM guide extending in a direction parallel to the LM, and the LM guide A guide mechanism having another LM guide extending in the orthogonal direction, the pair of connecting members being guided by the guide mechanism and maintaining a parallel state, in a direction orthogonal to the direction parallel to the moving direction of the bag body It was configured to reciprocate in two directions . The suction means corresponds to the suction cup of the embodiment. The connecting member corresponds to the first lever 50 and the second lever 60 of the embodiment. The rotating body corresponds to the first gear 41 and the second gear 42 in the embodiment. In the embodiment, the connecting member is directly attached to the gear. However, for example, it may be attached to a plate-like connecting plate that is attached coaxially with the gear and rotates integrally with the gear, and various other configurations are possible. In the embodiment, the gears constituting the rotating body are directly meshed with each other. However, the gears may be connected via other gears, or may not be linked with another drive source. Further, in the embodiment, the rotating body is rotated in a horizontal plane, but is not limited thereto.

  In this way, both the suction means are cantilevered, and a mechanism for moving the suction means along a predetermined locus (revolution movement) can be integrated on one side of the movement path of the bag. As a result, the entire apparatus is compactly collected. Further, the suction means separates while the pair of suction means move forward in the same direction as the movement direction of the bag body with the suction surface approaching and sucking the opening of the bag body from both sides. With this separation, the opening of the bag body is urged in the separation direction to open. And since an adsorption | suction means advances along the moving direction of a bag body when separating, it can open the bag body which moves continuously, without pausing.

  (2) The pair of rotating bodies rotate in opposite directions, the eccentric position is a position that is 180 degrees out of phase, and the movement of the pair of connecting members accompanying the rotation of the rotating body is The reciprocating movement in the direction parallel to the moving direction is performed in the same direction, the reciprocating movement in the direction orthogonal to the moving direction of the bag body is performed in the reverse direction, and the suction means attached to the pair of connecting members is a suction surface. It is good to comprise so that it may oppose, and it approaches and separates with the forward-backward movement of the pair of connecting members with respect to the direction orthogonal to the movement direction of the bag. Thus, the operation of the invention (1) can be performed with a simple configuration.

The present invention includes a line connecting the rotational center of the pre-Symbol rotor and LM guide extending in a direction parallel to a guide mechanism with another LM guide extending in a direction orthogonal with the LM guide, the paired connecting members Since it is configured to reciprocate in two directions, a direction parallel to the direction of movement of the bag body and a direction orthogonal to the direction of movement of the bag body while maintaining a parallel state guided by the guide mechanism, The movement is guided in two directions following the movement of the rotating body while reliably maintaining the pair of connecting members in a parallel state. That is, the connecting member is prevented from rotating (rotation around the connecting position to the rotating body is suppressed).

(3) It is preferable that at least a part of the pair of connecting members overlap with each other, and the pair of connecting members are connected to be movable in the axial direction. If it does in this way, since a pair of connecting members are connected directly, a state where it is mutually parallel can be maintained with a more reliable and simple composition. In addition, in order to implement | achieve invention of (1), the structure which makes a pair of connection member overlap in the upper and lower sides is not essential, and may be separated, and it is not necessary to connect connection members directly. .

(4) The rotating body may be a gear having a common drive source. This is preferable because it has a simple configuration and is more compact.

  The present invention can open the opening without temporarily stopping the continuously moving bag, and has a compact configuration.

It is a top view which shows an example of the system with which the bag opening apparatus which concerns on this invention is applied. It is a figure which shows the bag body of a process target, (a) is the front view, (b) is the side view. It is a perspective view showing one suitable embodiment of a bag opening device concerning the present invention. It is the front view. FIG. It is the left view. It is the right view. It is AA sectional drawing. It is BB sectional drawing. It is CC sectional drawing. It is a figure explaining an effect | action. It is a perspective view which shows another embodiment of a bag opening apparatus. It is the front view. FIG. It is the side view.

  FIG. 1 shows an example of a bag making and filling machine to which a bag opening device according to the present invention is applied. As shown in FIG. 1, this bag making filling and packaging machine includes a bag making apparatus 11 that manufactures a bag body using a belt-like packaging film disposed on the upstream side, and a bag that is sequentially carried out from the bag making apparatus 11. And a filling and packaging apparatus 12 that opens an opening to the body, fills the product, and performs a sealing process.

  The bag making apparatus 11 of the present embodiment folds the position as appropriate while continuously transporting the belt-shaped packaging film and seals and cuts the bag body with the upper part opened and the lower part and the left and right side edges closed. Make a bag. For example, as shown in FIG. 2, the bag body 1 has a rectangular shape as a whole and is folded back on the bottom side to have a W-shaped cross section. Both side edges 1a are sealed in a substantially band shape, and the bottom 1b side is sealed in an arc shape. Thereby, when it finally becomes a package, a bottom part opens and it becomes possible to become independent. And the manufactured bag 1 is continuously carried out from the bag making apparatus 11 without pausing at regular intervals.

  The filling and packaging apparatus 12 receives a bag body sequentially carried out from the bag making apparatus 11 one by one and continuously conveys the bag body through a predetermined path, and is disposed in the middle of the conveyance path of the conveying apparatus 13. A bag opening device 14 that opens the opening, a package supply device 15 that is disposed on the downstream side of the bag opening device 14 and that fills the package in the bag with the opening open, and downstream of the package supply device 15 A sealing device 16 or the like is provided that closes and seals the opening of the opened bag body disposed on the side.

  The transport device 13 is configured such that clamps 21 are attached at regular intervals to an endless chain 20 that continuously travels horizontally along a predetermined locus. In the present embodiment, the movement trajectory (arrangement layout) of the chain 20 is not a general circle or ellipse, but is a shape in which the travel path is bent. In this configuration, chain guides that define the trajectory of the travel path are arranged on both the left and right sides of the travel path constituting the chain 20. A pair of rollers is arranged on the pins constituting the chain with a gap in the axial direction of the pins, and these rollers come into contact with any of the inner surfaces of the chain guides arranged on the left and right sides of the traveling path. That is, a step is provided on the inner surface of the inner chain guide, a portion facing the upper roller is dented, and a portion facing the lower roller protrudes. Further, a step is provided on the inner surface of the outer chain guide, and the portion facing the upper roller protrudes and the portion facing the lower roller is dented. Therefore, when the chain travels, the upper roller contacts the outer chain guide but does not contact the inner chain guide. On the other hand, the lower roller contacts the inner chain guide, but does not contact the outer chain guide. As a result, the chain is guided by the chain guide and moves along a route defined by the chain guide.

  The package supply device 15 tilts the cup by gradually tilting the cup while moving the semicircular locus while holding the cup to which the packaged items such as snacks are supplied in a fixed amount. The article to be packaged supplied inside is supplied into the bag body from the opening of the bag body. This packaged article supply apparatus 15 conveys the rotary product filling apparatus main body 17 in which the traveling path of the chain 20 is arranged inside the arc-shaped region, and the cup 3 to which the packaged article is supplied, and the cup 3 is provided with a cup transport and supply device 18 for sequentially passing 3 to the rotary product filling device main body 17 and a cup unloading device 19 for receiving and transporting empty cups 3 transported from the rotary product filling device main body 17. Although not shown, an article supply device for the cup is arranged between the downstream side of the cup carry-out device 19 and the upstream side of the cup conveyance supply device 18, and a plurality of quantified amounts constituting the packaged item are arranged. Articles are fed into the cup. Thereby, the to-be-packaged product supply apparatus 15 supplies a fixed quantity of to-be-packaged object to a cup with the said article supply apparatus first. And the cup conveyance supply apparatus 18 conveys the cup containing the to-be-packaged article in a single line, and passes the said cup to the rotary type product filling apparatus main body 17 one by one from the head in time. The cup passed to the rotary product filling device main body 17 moves along the circumference. At this time, the cup is tilted by gradually inwardly inclining from the horizontal state while the bottom is held by one of a plurality of circulating carriers, and finally the entire bottom of the cup is Located above the upper opening of the cup. Therefore, the article to be packaged in the cup falls from the cup and fills the bag. Thereafter, the carrier gradually returns to a horizontal state, so that the bottom of the empty cup is lowered and the cup posture is restored. The cup carry-out device 19 receives the empty cup 2 carried out from the rotary product filling device main body 17 and conveys it in a single row to carry the article supply device for the cup.

  The sealing device 16 for sealing includes a primary sealing device 22 and a secondary sealing device (cooling device) 23 that are arranged along the transfer direction of the bag body 1. Both the primary seal device 22 and the cooling device 23 include a pair of bar sealers and a drive device that revolves the bar sealers along a predetermined locus in a horizontal plane. The bar sealer is disposed so as to extend in the same direction as the direction in which the bag is transferred. Then, the pair of bar sealers approach each other to pinch the upper end of the bag body 1 and move in the transfer direction in accordance with the transfer of the bag body 1 in that state, and then the bar sealers separate from each other and the phase direction of the bag body Moves in the opposite direction to return to the original position. As a result, the upper end of the bag body is sandwiched between a pair of bar sealers for a certain period of time in the primary seal device 22 and heated and pressurized, and then the seal portion is sandwiched and cooled by the water-cooled bar sealer in the cooling device 23 and formed on the seal surface. The seal eyes are formed with the formed goza eyes. Stable sealing can be performed by cooling the sealing part.

  Further, a hole punch device 24 and a trimming cutter device 25 are disposed on the downstream side of the sealing device 16. The hole punch device 24 punches out the central portion sealed by the seal device 16 to form a hole. The trimming cutter device 25 performs a process of cutting the corners of the bag body into a curved shape. As a result, the pouch 4 in which the item to be packaged is hermetically stored is manufactured. The non-defective pouch 4 is discharged to the carry-out conveyor 26. The defective pouch 4 ′ is discharged by the defective product discharge conveyor 27. Further, the pass / fail judgment of the pouch manufactured by the pass / fail judgment device provided at a predetermined position of the transfer path of the transport device 13 is performed, and the pouch 4/4 ′ is discharged to any conveyor 26/27 in response to the pass / fail judgment result. The

  Next, a more specific embodiment of the bag opening device 14 will be described based on FIG. 3 and subsequent drawings. The bag opening device 14 includes a pair of suction cups (first suction cup 31 and second suction cup 32) and a drive device that rotates the first and second suction cups 31 and 32 along a predetermined locus in a horizontal plane. A servo motor 35 serving as a drive source of the drive device is suspended and fixed to a mounting base 34 installed on the first base 33. Above the first base 33, a second base 37 supported by a column portion 36 standing upright on the upper surface of the first base 33 is disposed.

  As shown in FIG. 8 and the like, a first bearing portion 45 and a second bearing portion 46 are installed at predetermined positions on the upper surface of the second base 37. The first gear 41 is supported by the first bearing portion 45, and the second gear 42 is supported by the second bearing portion 46. The first gear 41 is linked to the output shaft of the servo motor 35 via the speed reducer 39 and rotates as the servo motor 35 rotates. The first gear 41 and the second gear 42 mesh with each other, and the rotation of the first gear 41 is transmitted to the second gear 42. As a result, when the servo motor 35 rotates, the first and second gears 41 and 42 rotate in synchronization. Further, disk-shaped gear covers 47 and 48 are attached to the upper surfaces of the first and second gears 41 and 42, respectively.

  A gear cover 38 is disposed on the second base 37 so as to cover the first and second gears 41 and 42. A circular opening is provided at a position facing the first and second gears 41 and 42 (gear covers 47 and 48) on the top surface of the gear cover 38. By exposing the gear covers 47 and 48 from the opening, the rotating part including the first and second gears 41 and 42 is covered.

  The base end side of the first lever 50 is linked to the first gear 41, and the first suction cup 31 is attached to the tip of the first lever 50. Similarly, the base end side of the second lever 60 is linked to the second gear 42, and the second suction cup 32 is attached to the tip of the second lever 60. The first lever 50 and the second lever 60 are linked to positions deviated from the center of rotation with respect to the first gear 41 and the second gear 42, respectively, and the levers 50 and 60 are set in a positional relationship that is 180 degrees out of phase. Is done.

  The first lever 50 is configured as follows. First, the first connecting pin 51 is attached to a predetermined position of the first gear 41. The third bearing portion 52 is mounted on the upper end of the first connecting pin 51. Then, the base end portion 53 a of the first connection bar 53 is fixed to the upper end of the third bearing portion 52. The first connecting bar 53 has a substantially planar shape in which one end (base end 53a) of the main body of the elongated strip is wide, and is arranged in a horizontal plane. The first suction cup mounting plate 54 is connected to the tip of the first connection bar 53, and the first suction cup 31 is attached to the tip of the first suction cup mounting plate 54. The first suction cup mounting plate 54 is positioned in a plane orthogonal to the first connecting bar 53 and is mounted in a downward inclined shape with the tip lowered.

  The second lever 60 is configured as follows. First, the second connecting pin 61 is attached to a predetermined position of the second gear 42. The fourth bearing portion 62 is attached to the upper end of the second connecting pin 61. And the center connection part 63a of the 2nd connection bar 63 is fixed to the lower end of the 4th bearing part 62. As shown in FIG. The second connecting bar 63 has a shape in which one side near the center of the main body of the elongated strip is protruded outward to provide a central connecting portion 63a, and is arranged in a horizontal plane. The height position of the second connection bar 63 is lower than that of the first connection bar 53. The second suction cup mounting plate 64 is connected to the tip of the second connection bar 63, and the second suction cup 32 is attached to the tip of the second suction cup mounting plate 64. The second suction cup mounting plate 64 is positioned in a plane orthogonal to the second connecting bar 63 and is mounted in a downward inclined shape with the tip lowered. The inclination angle of the second suction cup mounting plate 64 is smaller than the inclination angle of the first suction cup mounting plate 54, and the height positions of the tips of the two suction cup mounting plates 54 and 64 are equal (see FIG. 4 and the like). Furthermore, the front end of the first suction cup mounting plate 54 and the front end of the second suction cup mounting plate 64, that is, the first suction cup 31 and the second suction cup 32 are shifted back and forth along the bag transfer direction (FIG. 3). (See FIG. 6). Further, the first connection bar 53 and the second connection bar 63 are arranged so as to overlap vertically.

  Further, the first lever 50 (first connection bar 53) and the second lever 60 (second connection bar 63) are linked by an LM guide that regulates two axes, the X axis and the Y axis that are orthogonal to each other, and prevent rotation. doing. That is, both the connecting bars 53 and 63 are linked in parallel and relatively move forward and backward in the axial direction. The cooperation mechanism using this LM guide is as follows.

  First, both receiving members 71 standing on both sides of the first base 33 and the second base 37 are connected, and the first LM mounting plate 72 is installed so as to span the upper ends of the receiving members 71. The first LM mounting plate 72 extends over the gear cover 38 and is disposed in parallel with a line connecting the rotation centers of both the gears 41 and 42. The line connecting the rotation centers of both gears 41 and 42 is parallel to the transfer direction of the bag 1.

  A first LM rail 73a constituting a first LM guide 73 is mounted at the center of the upper surface of the first LM mounting plate 72, and the first LM block 73b reciprocates on the first LM rail 73a. Since the first LM rail 73a is disposed along the first LM mounting plate 72, the moving direction of the first LM block 73b is parallel to the transfer direction of the bag body 1 (X-axis direction for convenience).

  One end of the LM joint 74 is connected to the first LM block 73b. The other end of the LM joint 74 is connected to the second LM block 75 b that constitutes the second LM guide 75. And the 2nd LM rail 75a which comprises the 2nd LM guide 75 is arrange | positioned so that it may extend in the orthogonal direction (Y-axis direction) with the 1st LM rail 73a. The second LM rail 75a is connected to the first connecting bar 53 via the LM mounting plate 76, and the second LM rail 75a and the first connecting bar 53 are arranged in parallel.

  On the other hand, a third LM rail 77a constituting the third LM guide 77 is mounted on the upper surface of the second connecting bar 63, and the third LM block 77b reciprocates on the third LM rail 77a. Further, since the first connection bar 53 and the second connection bar 63 are arranged so as to overlap each other, the third LM block 77 b is linked to the first connection bar 53. That is, relative movement of the first connecting bar 53 and the second connecting bar 63 is allowed in the axial direction (Y-axis direction). The first connection bar 53 and the second connection bar 63 are prevented from moving relative to each other in the direction orthogonal to the axial direction (X-axis direction: the direction in which the bag is transported), and are integrated in the direction along the first LM guide. And reciprocates.

  Accordingly, as the first gear 41 and the second gear 42 rotate in synchronization, the first connection pin 51 and the second connection pin 61 attached to each gear also rotate (phase difference 180 degrees). And the 1st gear 41 and the 2nd gear 42 are arrange | positioned along the transfer direction of the bag body 1 (The line which connects both the gears 41 and 42 rotation center, and the transfer direction of a bag body are parallel). Therefore, the first connecting pin 51 and the second connecting pin 61 move forward and backward while maintaining the relative position (the separation distance in the X-axis direction) of both in the X-axis direction parallel to the bag transfer direction. To do. This movement in the X-axis direction is guided by the first LM guide 73.

  In addition, the first connecting pin 51 and the second connecting pin 61 are moved forward and backward with a 180-degree shift in the Y-axis direction orthogonal to the bag transfer direction. That is, when the first connection pin 51 is located on the most front side (bag transfer path side), the second connection pin 61 is located on the most rear side (side away from the bag transfer path) and the first connection pin When the pin 51 is located on the most rear side (side away from the bag transfer path), the second connecting pin 61 is located on the most front side (bag transfer path side). Therefore, the difference between the length from the first connecting pin 51 to the tip of the first connecting bar 53 and the length from the second connecting pin 61 to the tip of the second connecting bar 63 is determined from each gear 41, 42 to each connecting pin. When the length of the first connection pin 51 is set to the foremost side, the distance between the first and second suction cups 31 and 32 is widest and the first connection pin 51 is the rearmost side. Between the first and second suction cups 31 and 32 is the narrowest (both suction cups 31 and 32 are in contact with the upper portion of the bag body 1 and are adsorbed). This movement in the Y-axis direction is guided by the second LM guide 75 and the third LM guide 77.

  Further, the first and second suction cups 31 and 32 are connected to a suction tube 78, and are linked to an external suction pump (not shown) via the suction tube 78. Suction by a suction pump is performed at an appropriate timing, so that the first and second suction cups 31 and 32 can be sucked, and the film part (opening portion of the bag body) where the first and second suction cups 31 and 32 are in contact Hold by adsorption. Further, when suction by the suction pump is released at an appropriate timing, the first and second suction cups 31 and 32 can be separated from the bag body.

A detection plate 82 is attached to the rotation shaft (detection shaft) of the second gear 42. A sensor 81 arranged adjacent to the detection plate 82 detects the detection plate 82. Based on the output of the sensor 81, the controller in the control panel (not shown) recognizes that the second gear 42 (the second connecting pin 61 and thus the second lever 60) has come to the reference position, and the controller The rotational angle positions of the second gear 42 and the fourth gear 41 are obtained, and the rotational operation of the servo motor 35 is controlled. Thus, while the first and second suction cups 31 and 32 are in contact with the bag body 1, the moving speed of the first and second suction cups 31 and 32 is controlled to be equal to the transfer speed of the bag body 1. To do.
Further, on the carry-out side of the bag opening device 14, a bag opening detection device 83 including a photoelectric sensor or the like is installed so as to straddle the travel path of the bag body 1 to inspect whether or not the bag body 1 is correctly opened.

  Next, the operation of the bag opening device configured as described above will be described. As shown in FIG. 11 (a), the clamp 21 sandwiches and supports the front and rear of the bag body 1 in the transfer direction (the arrow direction in the figure) with a pair of sandwiching claws 21a and 21a. In the state shown to Fig.11 (a), although the distance of the 1st suction cup 31 and the 2nd suction cup 32 is approaching, it is separated by the predetermined distance. The bag body 1 supported by the clamp 21 is transferred into the space between the first suction cup 31 and the second suction cup 32.

  From this state, the first and second gears 41 and 42 further rotate, the first connecting pin 51 is farthest from the traveling path of the bag body, and the second connecting pin 61 reaches the position closest to the traveling path of the bag body. As shown in FIG. 11 (b), the first suction cup 31 and the second suction cup 32 are in contact with the bag body 1. This position is referred to as a reference position (0 degree) for convenience. When suction from the suction pump is connected to the first and second suction cups 31 and 32 at this timing, the suction cups 31 and 32 suck and hold the film surface of the bag body 1.

  When both gears 41 and 42 rotate from this reference position, both levers 50 and 60 and thus both suction cups 31 and 32 move forward in synchronism with the forward movement of the bag, and gradually move away with the forward movement. Therefore, when the suction cups 31 and 32 are maintained in the state of being sucked and held, the opening of the bag body 1 opens (see FIG. 11C). At this time, the clamp 21 narrows the distance between the pair of clamping claws 21a and 21a to facilitate opening the opening of the bag body 1. Furthermore, when opening the opening of the bag body 1, air is blown toward the opening from an upper nozzle (not shown) to assist in opening the bag.

  When the suction is subsequently released, the suction cups 31 and 32 are separated from the bag body, but the state in which the opening of the bag body 1 is opened by keeping the distance between the pair of clamping claws 21a and 21a narrowed. Maintain (see FIG. 11D). As the clamp 21 moves forward in the transfer direction of the bag body, the bag body 1 is transferred with the opening portion opened, and is supplied to the package supply device 15 at the next stage.

  FIG. 12 and subsequent figures show other embodiments. In this embodiment, a function of opening the lower side of the bag body is provided. First, three first suction cups 31 and three first suction cups 32 were arranged along the bag body transfer direction. Thereby, the upper part of the bag which is an opening can be firmly adsorbed and opened. In addition, the first suction cup mounting plate 54 ′ for mounting the first suction cup 31 is inclined obliquely as a whole as in the above-described embodiment. However, since three first suction cups 31 are attached, the tip thereof is horizontal. It extends in the direction. Further, the second suction cup mounting plate 64 ′ for mounting the second suction cup 32 extends in the horizontal direction as a whole, and the width of the second suction cup mounting plate 64 ′ is wide so that the front end portion (the portion for mounting the second suction cup 32) protrudes downward. L-shaped.

  Further, the front end portion of the first suction cup mounting plate 54 'is provided with a strip-shaped vertical portion 54'a extending downward. Three lower suction cups 91 are vertically attached to the vertical portion 54a 'so as to be lined up and down. As a result, the lower first suction cup 91 revolves along a predetermined locus together with the first suction cup 31. That is, when the first suction cup 31 contacts the upper opening of the bag body, the lower first suction cup 91 also contacts the lower central portion of the bag body. The suction cups 31 and 91 are both linked to the suction pump via the suction tube 78 and are started / released at the same timing. Therefore, when the suction cups 31 and 91 are attracted and pulled, the upper opening of the bag 1 is opened. While opening, the lower part of the bag can also be opened, and then the suction cups 31 and 91 are separated from the bag when suction is released.

  On the other hand, the lower second suction cup 92 for opening the lower part of the bag body on the second suction cup 32 side is the same as the lower first suction cup 91, and the second suction cup mounting plate 64 'for mounting the second suction cup 32 is used. If it is integrally attached to the space, it will not be possible to move it back in space. Therefore, the lower second suction cup 92 is arranged independently of the second suction cup 32.

  Specifically, one end of the connection bracket 90 is connected to the LM joint 74 connected to the first LM block 73b of the first LM guide 73, and a connection bar 94 extending downward is connected to the other end of the connection bracket 90. An L-shaped plate 95 is connected to the lower end of the bar 94. A cylinder 96 is attached to the tip of the L-shaped plate 95. Then, the lower second sucker mounting plate 97 is connected to the cylinder rod of the cylinder 96, and the lower second sucker mounting plate 97 is mounted with three lower second suckers 92 in a vertical row.

  As a result, the L-shaped plate 95 and the cylinder 96 from the connecting bracket 90 reciprocate in parallel with the bag transfer direction as the first gear 41 rotates. That is, since it is linked to the first LM guide 73, it is reciprocated while being guided by the guide. When the cylinder lot of the cylinder 96 is contracted, the lower second suction cup 92 is in a state of being close to and in contact with the bag body. Therefore, when suction is started in this state, the lower part of the bag is adsorbed by the lower second suction cup 92. Then, by operating the cylinder 96 and extending the cylinder rod, the lower second suction cup 92 is moved to the back, and the lower portion of the bag body is opened.

In this embodiment, the second LM guide 77 attached to the second connection bar 63 is linked to the first LM block 73c linked to the first LM rail 73a of the first LM guide 73 via the LM joint 74 '. Yes.
In addition, since the other structure and effect are the same as that of embodiment mentioned above, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

14 bag opening device 31 first sucker 32 second sucker 35 servo motor 41 first gear 42 second gear 50 first lever 53 first connection bar 60 second lever 63 second connection bar 73 first LM guide 75 second LM guide 77 3rd LM Guide

Claims (4)

A bag opening device for opening an opening of a moving bag body,
A pair of rotating bodies arranged along the direction of movement of the bag,
A pair of connecting members that are linked to the eccentric positions with respect to the pair of rotating bodies and arranged to extend toward the movement path of the bag body;
A suction means attached to the tip of the connecting member,
The suction means attached to the pair of connecting members approach each other while maintaining the state where the suction surfaces face each other with the rotation of the pair of rotating bodies, and the suction surfaces approach both outer surfaces of the opening of the bag body. So that the bag body moves away while following the movement of the bag body in the adsorbed state ,
A guide mechanism including an LM guide extending in a direction parallel to a line connecting the rotation centers of the rotating body, and another LM guide extending in a direction orthogonal to the LM guide;
The pair of connecting members are reciprocated in two directions, a direction parallel to a direction of movement of the bag body and a direction orthogonal to the direction of movement of the bag body, while being guided and guided by the guide mechanism. . The pair of rotating bodies rotate in opposite directions,
The eccentric position is a position that is 180 degrees out of phase, and the movement of the pair of connecting members accompanying the rotation of the rotating body is performed in the same direction as the reciprocating movement in the direction parallel to the moving direction of the bag body. The reciprocating movement in the direction orthogonal to the moving direction of the bag body is performed in the opposite direction,
The adsorbing means attached to the pair of connecting members are configured such that the adsorbing surfaces face each other and approach and separate as the pair of connecting members move forward and backward relative to a direction orthogonal to the direction of movement of the bag body. The bag opening apparatus according to claim 1. The pair of connecting members are in a state in which at least a part thereof overlaps vertically,
3. The bag opening device according to claim 1, wherein the pair of connecting members are connected so as to be movable in the axial direction.   The bag opening device according to any one of claims 1 to 3, wherein the rotating body is a gear having a common drive source.

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