JP2020037443A - Bag processing machine, bag opening method, nozzle device for bag opening processing and nozzle attachment - Google Patents

Abstract

To provide a bag processing machine capable of easily increasing an accuracy of bag opening processing.SOLUTION: A bag processing device 10 according to an embodiment includes a bag holding device 11 for holding a bag 100, and a nozzle device 12 for opening a mouth part 101 of the bag held by the bag holding device 11. The nozzle device 12 has a nozzle 50 for blowing gas toward the mouth part 101 of the bag 100, and a turbulence generator 61 that is provided between a gas outlet 50A of the nozzle 50 and the mouth part 101 of the bag 100 and generates turbulence in the flow of gas blown out by the nozzle 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bag processing machine, a bag opening method, a nozzle device for bag opening processing, and a nozzle attachment.

  2. Description of the Related Art A device that utilizes a gas when a bag is opened is conventionally known. For example, Patent Literature 1 discloses an apparatus that opens a mouth of a bag by blowing air from a blower to the mouth of the bag. In this device, a take-out plate is provided for taking out the film-shaped bags stocked one by one with the mouth facing upward, the take-out plate has an adhesive portion, a reference position away from the bag, and a It is swingable between a contact position where the contact is made via the adhesive portion. When opening the mouth of the bag, the take-out plate is moved to the contact position to bring the adhesive portion into contact with the bag, then returned to the reference position, and then, at the reference position, the blower blows air to the mouth of the bag. Send.

  Further, in the device of Patent Document 1, a cylindrical guide frame for inputting agricultural products and regulating air blowing is provided between the blower and the bag. The guide frame has a function of guiding the wind from the blower to the mouth of the bag, and a function of guiding the crop inside the bag when the crop is inserted into the opened bag.

  On the other hand, Patent Literature 2 discloses a device that opens a mouth portion of a bag by using a pair of rollers each having a built-in one-way clutch that physically contacts the bag and jetting air. . In this device, air is injected into the bag after a pair of rollers partially open the mouth of the bag.

  Patent Literature 3 discloses an apparatus that opens a bag by using air injection and a pair of suction cups that physically contact the bag. In this device, a pair of fall prevention members are provided so as to be opposed to each other in the thickness direction of the bag, and are detachable from the bag. Extends beyond the mouth. Further, the pair of suction cups are also arranged so as to face each other in the thickness direction of the bag, and can be separated from and contacted with each other.

  In the device of Patent Document 3, when opening the mouth of the bag, the pair of fall prevention members approach the bag, and the pair of suction cups contact the bag. Air is jetted toward. Accordingly, the bag is prevented from falling down due to the air, and the air is intensively blown to the mouth. Thereafter, the pair of fall prevention members separate from the bag, and the pair of suction cups move to pull the bag toward both sides in the thickness direction. Thus, the mouth of the bag can be reliably opened.

JP 2003-231508 A Japanese Utility Model Publication No. 3-22084 Japanese Patent No. 5913992

  In the apparatus disclosed in Patent Document 1, since the object to be packaged in the bag is an agricultural product, it is considered that the apparatus is supposed to open a thin soft bag such as a so-called plastic bag. Therefore, it is not assumed that the bag is opened like a so-called pouch and the opening of the bag is tightly closed. Therefore, it cannot be said that the device of Patent Document 1 is sufficiently devised to reliably open the mouth of the bag.

  Further, the devices disclosed in Patent Literatures 2 and 3 use a jet of air and a member that physically contacts the bag, so that the structure is complicated. In addition, since the pair of fall prevention members and the pair of suction cups, which are members that are in physical contact with each other, need to perform an operation of separating and contacting each other, it takes time for the bag opening process for this operation. Therefore, there is room for improvement in increasing the speed of the opening process.

  The present invention has been made in view of the above circumstances, and provides a bag processing machine, a bag opening method, a nozzle device for bag opening processing, and a nozzle attachment that can easily increase the accuracy of bag opening processing. Aim.

  A bag processing machine according to the present invention includes a bag holding device for holding a bag, and a nozzle device for opening a mouth portion of the bag held by the bag holding device, wherein the nozzle device includes the bag. A nozzle that blows out gas toward the mouth of the bag held by a holding device, and at least one of an internal flow path of gas formed in the nozzle between the outlet of the nozzle and the mouth of the bag. And a turbulence generator configured to generate turbulence in the flow of gas blown out by the nozzle.

  The bag holding device may hold a pair of side edges of the bag located on both sides of the mouth portion, and may have a pair of grippers configured to be detachable from each other. The pair of grippers may be brought close to each other simultaneously with or after the start of the gas blowing by the nozzle.

  The turbulence generating portion may be a rod-shaped member, and the turbulence generating portion may extend so as to cross the center axis when viewed in an axial direction of a center axis of the outlet of the nozzle.

  When viewed in the axial direction of the central axis of the outlet of the nozzle, the longitudinal direction of the turbulence generating portion is orthogonal to the direction in which both side edges of the bag located on both sides of the mouth face each other. Good.

  The nozzle device may further include a holding portion fixed to the nozzle and holding the turbulence generating portion, wherein the turbulence generating portion is configured such that the turbulence generating portion has an outlet of the nozzle and a mouth of the bag. The turbulence generating section may be held so as to be arranged between the turbulence generating section.

  The turbulence generating section may be held by the holding section such that a position with respect to the outlet is freely adjustable.

  The relative position between the outlet and the bag holding device may be adjustable.

  Further, in the bag opening method according to the present invention, the holding step of holding the bag, and blowing the gas in a turbulent state toward the mouth of the held bag to open the mouth of the bag. Bag opening step.

  In addition, the nozzle device for bag opening processing according to the present invention includes a nozzle that blows gas toward the mouth of the bag, a position outside the nozzle facing the outlet of the nozzle, and a gas formed in the nozzle. And a turbulence generating section that is arranged in at least one of the internal flow paths and generates turbulence in the flow of gas blown out by the nozzle.

  Further, the nozzle attachment according to the present invention is a nozzle attachment detachably attached to a nozzle that blows gas toward the mouth of the bag, and a holding portion detachably fixed to the nozzle, and an outside of the nozzle. And a turbulence generating unit that is held by the holding unit so as to face the outlet of the nozzle and generates turbulence in the flow of gas blown out by the nozzle.

  According to the present invention, the accuracy of the bag opening process can be easily increased.

It is a perspective view showing the schematic structure of the bag processing machine provided with the nozzle device concerning a 1st embodiment of the present invention. It is the figure which looked at the nozzle device concerning a 1st embodiment, and the bag positioned with respect to the nozzle device concerned in the direction of arrow II of Drawing 1. FIG. 3 is a view of the nozzle device and the bag shown in FIG. 2 as viewed in a direction of an arrow III in FIG. 2. FIG. 4 is a view of the nozzle device and the bag shown in FIG. 2 as viewed in the direction of arrow IV in FIG. 2. It is a figure explaining bag opening processing in a bag processing machine concerning a 1st embodiment, and (A) is a figure showing signs that air was blown out toward a bag from the nozzle device shown in Drawing 2. (B) is a diagram showing a state where both side edges of the bag are approached by the gripper while blowing air from the nozzle device toward the bag. 5A is a view of the nozzle device shown in FIG. 5A as viewed from above, and FIG. 5B is a view of the nozzle device shown in FIG. 5B as viewed from above. FIG. 7A is a diagram showing a nozzle of a nozzle device according to a second embodiment, and FIG. 7B is a diagram of the nozzle as viewed in the direction of arrow VIIB in FIG. 7A. It is a perspective view of a nozzle attachment in a nozzle device concerning a 3rd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
First, a first embodiment will be described.
(Bag processing machine)
FIG. 1 is a perspective view showing a schematic configuration of a bag processing machine 10 according to a first embodiment of the present invention. The bag processing machine 10 shown in FIG. 1 is a packaging machine as an example, and a bag holding device 11 for holding and transferring the bag 100, and a bag for opening an opening 101 of the bag 100 held by the bag holding device 11. A nozzle device 12 for opening processing, a contents filling device 13 for filling contents into the opened bag 100, and the like are provided.

  The bag holding device 11 holds the bag 100 with a pair of grippers 22 for gripping the bag 100, intermittently moves the pair of grippers 22, and sequentially transfers the bag 100 to a plurality of stations S1 to S8. In each of steps S8 to S8, the pair of grippers 22 and the bag 100 are intermittently stopped. The illustrated bag holding device 11 has a plurality of pairs of grippers 22 and a circular rotary table 20 indicated by a two-dot chain line to which each pair of grippers 22 is attached, and transfers the bags 100 along a curved path. A rotary transfer system is adopted. The bag 100, together with the pair of grippers 22, sequentially goes around a plurality of stations S1 to S8 set around the turntable 20.

  A plurality of pairs of the pair of grippers 22 (specifically, the same number of pairs as the plurality of stations S <b> 1 to S <b> 8) are attached to the periphery of the turntable 20 at equal intervals in the circumferential direction. The method of transferring the bag 100 by the bag holding device 11 is not limited. For example, a linear transfer method of transferring the bag 100 along a linear path, or a method in which the rotary transfer method and the linear transfer method are combined is used in the bag holding device 11. May be adopted. Further, the bag holding device 11 may adopt a method of continuously transferring the bags 100. In this case, the above-described nozzle device 12 and the content filling device 13 may move so as to follow the bag 100 being transferred.

  The plurality of stations illustrated in FIG. 1 include a first station S1 to an eighth station S8.

  In the first station S1, the bags 100 taken out one by one from the conveyor magazine 31 are transferred to the pair of grippers 22 via the take-out sucker pair 32, and the bags 100 are gripped by the pair of grippers 22.

  The bag 100 transported in the present embodiment is a rectangular bag in a front view, and the peripheries of a pair of rectangular films opposed to each other are directly or indirectly joined via another member. It is formed in a bag shape. Immediately after the bag 100 has been transferred from the conveyor magazine 31 to the pair of grippers 22, one side of the bag 100 is not joined, and the opening 101 that opens to the outside is formed.

  In the illustrated example, the bag 100 is gripped by the gripper 22 so that the mouth 101 faces upward. At this time, the pair of grippers 22 extend downward from the mouth 101 side of the bag 100 and face each other in the horizontal direction. In other words, a pair of side edges (hereinafter, sometimes referred to as both side edges) of the bag 100 located on both sides of the mouth 101 are separately gripped. Here, the pair of grippers 22 according to the present embodiment are configured to be able to freely contact and separate from each other in a direction in which both side edges of the bag 100 face each other, while gripping both side edges of the bag 100. In the first station S1, the pair of grippers 22 are located at reference positions separated from each other by a predetermined distance, and grip the bag 100 so that the bag 100 is flat and the mouth 101 is closed. The pair of grippers 22 can be separated from and brought into contact with each other between the reference position and an approaching position approaching each other from the reference position. The shape of the bag 100 is not particularly limited, and the bag 100 may be, for example, a circle, a triangle, a trapezoid, or the like.

  At the second station S2, information such as the date of manufacture is printed by the printer 33 on the bag 100 held by the pair of grippers 22.

  In the third station S3, the nozzle device 12 performs a bag opening process on the bag 100. Although details will be described later, the nozzle device 12 blows out gas, in this example, air, from the nozzle 50 toward the mouth 101 of the bag 100. In the present embodiment, the mouth 101 of the bag 100 is opened by the pair of grippers 22 moving from the reference position to the approach position while the nozzle device 12 blows out air. At this time, the pair of grippers 22 approach each other so as to approach both side edges of the bag 100 at the same time as or after the start of the air blowing by the nozzle 50. The gas blown out by the nozzle 50 is not limited to air, but may be, for example, nitrogen gas.

  In the fourth station S4, the contents are filled into the bag 100 by the contents filling device 13. At the fifth station S5, no specific processing is performed, but the pair of grippers 22 return to the reference position apart from the approach position. Thus, the mouth portion 101 of the bag 100 is closed although it is not sealed. In the sixth station S6, the closed mouth portion 101 is sandwiched by the first hot plate 37 to perform a first thermocompression bonding process. Subsequently, in the seventh station S7, the closed mouth portion 101 is further moved to the second hot plate 37. The second thermocompression bonding process is performed while being sandwiched between the hot plates 38.

  In the eighth station S8, the thermocompression-bonded portion of the bag 100 is sandwiched and cooled by the cooling plate 39, and the mouth portion 101 is hermetically sealed. Then, the inside of the bag 100 is isolated from the outside. Thereafter, at the eighth station S8, the bag 100 is released from the pair of grippers 22, and the bag 100 falls along the discharge chute 40 and is sent to the subsequent stage.

(Nozzle device)
Next, the nozzle device 12 for bag opening processing will be described. FIG. 2 is a view of the bag 100 positioned with respect to the nozzle device 12 by the nozzle device 12 and the bag holding device 11, as viewed in the direction of arrow II in FIG. FIG. 3 is a view of the nozzle device 12 and the bag 100 shown in FIG. 2 as viewed in the direction of arrow III in FIG. FIG. 4 is a view of the nozzle device 12 and the bag 100 shown in FIG. 2 as viewed in the direction of arrow IV in FIG. FIGS. 2 to 4 show a state in which the bag 100 is transferred to the third station S3 as the bag opening position. When the bag 100 is transferred in a continuous manner, the above-described bag opening position may be referred to as a bag opening section.

  As shown in FIGS. 2 to 4, the nozzle device 12 according to the present embodiment includes a nozzle 50 that blows out a gas (air in this example) toward the mouth 101 of the bag 100 gripped by the pair of grippers 22. A nozzle attachment 60 having a turbulence generator 61 disposed between the outlet 50A of the nozzle 50 and the mouth 101 of the bag 100 to generate turbulence in the flow of air blown out by the nozzle 50; And a pipe 52 connecting the nozzle 50 and the compressed air supply source 51, and an on-off valve 53 provided on the pipe 52.

  The nozzle 50 is a bag opening processing nozzle, and blows out the air from the compressed air supply source 51 from the blowout port 50A through an internal flow path 50B (see FIGS. 3 and 4) indicated by a broken line. The nozzle 50 in the present embodiment is cylindrical, and has a circular outlet 50A at one end in the axial direction. 2 to 4, reference numeral C1 indicates a central axis of the outlet 50A, and air blown from the outlet 50A flows along the central axis C1. The compressed air supply source 51 is, for example, a compressed air tank, and the on-off valve 53 is, for example, an electromagnetic on-off valve. For example, when a controller (not shown) opens the on-off valve 53, air from the compressed air supply source 51 can flow into the internal flow path 50B of the nozzle 50, and then flow out from the outlet 50A.

  As shown in FIG. 2, the nozzle 50 is supported by the Fourem F via the bracket 55, and in this supported state, the outlet 50A faces downward in the vertical direction. In a state before the air is blown out by the nozzle 50, the pair of grippers 22 are located at the reference positions separated from each other by a predetermined distance, and the bag 100 is flat and the mouth 101 is closed. Here, the nozzle 50 is arranged so that the central axis C1 of the outlet 50A is included in a plane where the flat bag 100 extends and spreads as shown in FIG.

  The “plane in which the flattened bag 100 extends and spreads” means a planar region having a thickness determined by a distance between respective surfaces of a pair of rectangular films facing each other which constitute the bag 100. Note that such an arrangement of the nozzles 50 is a preferable embodiment, and the central axis C1 of the outlet 50A does not necessarily have to be included in a plane where the flat bag 100 extends and spreads. However, even when the center axis C1 is not included in the plane, the center axis C1 is preferably parallel to the plane.

  Subsequently, the nozzle attachment 60 includes a turbulence generating portion 61 and a holding portion 62 detachably fixed to the nozzle 50 and holding the turbulence generating portion 61. The holding portion 62 includes the turbulence generating portion 61. It is held outside the nozzle 50 at a position facing the outlet 50A. Thus, the turbulence generating section 61 is arranged between the outlet 50A and the mouth 101 of the bag 100. The holding portion 62 in the present embodiment is opposed to a cylindrical base 63 attached so as to surround the outer peripheral surface of the nozzle 50 with the center of the base 63 interposed therebetween and extends in the axial direction of the base 63 from the outer peripheral surface of the base 63. A pair of leg portions 64 extending therefrom, and a turbulence generating portion 61 is provided between the distal end portions of the pair of leg portions 64.

  As shown in FIG. 3, a bolt hole 63 </ b> A penetrating from the outer peripheral surface to the inner peripheral surface is formed in the base 63, and the bolt 63 </ b> B inserted into the bolt hole 63 </ b> A is pressed against the nozzle 50 so that the nozzle attachment 60 It is detachably fixed to 50. The base 63 has one end directed in the direction in which the outlet 50A of the nozzle 50 opens, and the leg 64 extends in the axial direction of the base 63 so as to exceed the one end. Thus, when the nozzle attachment 60 is fixed to the nozzle 50, the turbulence generating portion 61 is located so as to face the outlet 50A. The shape of the holding portion 62 and the manner of attachment to the nozzle 50 are not particularly limited. For example, the holding portion 62 may support the turbulence generating portion 61 in a cantilevered state.

  On the other hand, the turbulence generating section 61 interferes with the air blown out from the nozzle 50 and is provided to blow the turbulent air to the mouth 101 of the bag 100. The turbulence generating section 61 may be configured to, for example, divert a straight flow from the outlet 50A in an oblique direction or generate a Karman vortex. As shown in FIGS. 2 and 3, the turbulence generating section 61 in the present embodiment is a rod-shaped member, specifically, a round bar having a circular cross section. The shape of the turbulence generating portion 61 is not particularly limited. However, when the turbulence generating portion 61 is a rod-shaped member, it may be a prismatic member having a rectangular cross section or a triangular prism member having a triangular cross section. The turbulence generator 61 may be a columnar member having a streamlined or semicircular cross section.

  In the side view shown in FIG. 3, turbulence generating section 61 in the present embodiment extends so as to be orthogonal to central axis C1 of outlet 50A of nozzle 50. As shown in FIG. 4, when viewed in the axial direction of the central axis C1 of the outlet 50A, the turbulence generating portion 61 extends so as to cross the central axis C1, and more specifically, the turbulence generating portion 61. Is orthogonal to the direction D2 in which both side edges of the bag 100 face each other. In addition, since the turbulence generating section 61 needs to cause the air blown out from the nozzle 50 to reach the bag 100 in a state where the flow is disturbed, if it is too large, the air reaching the bag 100 decreases, and The opening process cannot be performed. Therefore, when viewed in the axial direction of the center axis C1 of the outlet 50A, the maximum width dimension of the turbulence generating portion 61 in a direction orthogonal to the longitudinal direction is, for example, not more than the outer diameter of the outlet 50A of the nozzle 50. Is desirable.

(motion)
Next, an operation of the bag processing machine 10 according to the present embodiment, in particular, a bag opening process will be described with reference to FIGS. 1, 5 and 6.

  As shown in FIG. 1, the bag 100 taken out of the conveyor magazine 31 at the first station S1 is gripped by the pair of grippers 22 and is first transferred to the second station S2 and printed by the printer 33.

  Thereafter, at the third station S3, a bag opening process is performed on the bag 100. Here, the mouth 101 of the bag 100 is opened by blowing out the air with the flow disturbed toward the mouth 101 of the bag 100. In the present embodiment, as shown in FIGS. 5A and 6A, first, a pair of grippers 22 in a reference state holds the mouth of bag 100 in a state where mouth 101 is closed. Air is blown from nozzle 50 toward 101. Immediately after the air is blown out, the pair of grippers 22 shift to the approaching state and approach each other, as shown by the direction of the arrow α in FIGS. 5B and 6B, and the mouth 101 is opened. .

  Here, in the present embodiment, since the turbulence generating portion 61 is disposed between the outlet 50A of the nozzle 50 and the mouth portion 101 of the bag, a plurality of turbulence generating portions 61 are provided in FIG. 5 (A) and FIG. As shown by the arrows in the drawing, the flow of the air blown out from the nozzle 50 is disturbed, and the disturbed air is blown to the mouth 101. Accordingly, air directed in various directions hits the mouth 101, and the mouth 101 is more easily opened than when air flowing linearly hits the mouth 101. The present inventor has confirmed this in an experiment. In the present embodiment, the pair of grippers 22 approach each other after the nozzle 50 starts blowing air, but the pair of grippers 22 may approach each other at the same time as the nozzle 50 starts blowing air.

  Then, in the fourth station S4, the contents are filled into the bag 100 having the opening 101 opened by the contents filling device 13. Thereafter, at the fifth station S5, the pair of grippers 22 move away from the approach position and return to the reference position. Thereby, the mouth part 101 of the bag 100 is closed. Then, at the sixth station S6 and the seventh station S7, the mouth portion 101 is thermocompression-bonded. Then, at the eighth station S8, the thermocompression-bonded portion of the bag 100 is sandwiched between the cooling plates 39 and cooled. The part 101 is hermetically sealed.

  According to the present embodiment described above, turbulence is generated in the flow of air blown out from nozzle 50 by turbulence generating portion 61 arranged between blowout opening 50A of nozzle 50 and mouth portion 101 of the bag. I do. The mouth 101 is easily opened by blowing the air whose flow is disturbed to the mouth 101. Therefore, the accuracy of the bag opening process can be easily increased. The present inventor has confirmed that the accuracy of the bag opening process can be particularly effectively increased when the Karman vortex is generated behind the turbulence generating section 61.

  In addition, in the present embodiment, since the bag opening process can be performed without using a member such as a suction cup which is separated and attached while being in physical contact with the bag 100, the speed of the bag opening process can be increased. Can be.

  Further, the pair of grippers 22 grip both side edges of the bag 100, and the pair of grippers 22 approach each other simultaneously with or after the start of the air blowing by the nozzle 50. Thus, after the opening 101 is partially opened by the air from the nozzle 50, the pair of grippers 22 move so as to separate the pair of films forming the opening 101 from the partial opening. Thereby, the opening 101 can be reliably opened.

  Further, the turbulence generating portion 61 is a rod-shaped member, and when viewed in the axial direction of the central axis C1 of the outlet 50A of the nozzle 50, the turbulence generating portion 61 extends so as to cross the central axis C1. Thereby, the turbulent flow can be concentrated on the surface orthogonal to the longitudinal direction of the turbulence generating section 61, and the air of the turbulent flow can be efficiently blown to the mouth 101. In particular, when viewed in the axial direction of the central axis C1, when the longitudinal direction of the turbulence generating portion 61 is orthogonal to the direction in which both side edges of the bag 100 are opposed, air escapes in the thickness direction of the bag 100. Instead, the flow toward the center in the longitudinal direction of the closed mouth portion 101 and the flow toward the direction away from the center are intensively blown to the mouth portion 101, so that the mouth portion 101 can be more reliably opened.

  The turbulence generator 61 is a part of the nozzle attachment 60 and is detachable from the nozzle 50. Thereby, the adjustment and maintenance of the position of the turbulence generating section 61 can be easily performed, and the convenience can be improved.

<Second embodiment>
Next, a second embodiment will be described. The same components as those in the first embodiment among the components in the present embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only a configuration different from the first embodiment will be described.

  FIG. 7A is a diagram showing the nozzle 50 of the nozzle device according to the second embodiment, and FIG. 7B is a diagram of the nozzle 50 as viewed in the direction of arrow VIIB in FIG. 7A. is there. As shown in FIGS. 7A and 7B, in the present embodiment, the turbulence generator 61 is arranged in the gas internal flow path 50 </ b> B formed in the nozzle 50. More specifically, a bar-shaped turbulence generator 61 is provided between the wall surfaces facing each other across the center of the internal flow path 50B having a circular cross section.

  In the present embodiment, the turbulence generating section 61 can be incorporated into the nozzle 50 in a compact manner. Note that the turbulence generating section 61 may be arranged both on the outside of the nozzle 50 and on the internal flow path 50B of the nozzle 50.

<Third embodiment>
Next, a third embodiment will be described. The same components as those of the first and second embodiments in the present embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Hereinafter, only different configurations from the first and second embodiments will be described.

  FIG. 8 is a perspective view of a nozzle attachment 60 in the nozzle device according to the third embodiment. In the nozzle attachment 60 according to the present embodiment, the turbulence generating section 61 is held by the holding section 62 so that the position with respect to the outlet 50A can be adjusted. Specifically, a long hole 64 </ b> A extending in the longitudinal direction of the leg portion 64 is formed in each of the pair of leg portions 64 of the holding portion 62 in the nozzle attachment 60. Bolt holes are formed at both ends of the rod-shaped disturbance generating portion 61, and each bolt 64B inserted into the pair of elongated holes 64A is fastened to the corresponding bolt hole of the disturbance generating portion 61, so that the disturbance generating portion 61 is formed. Are held by the holding portion 62. That is, in the present embodiment, the position of the turbulence generator 61 can be adjusted within the range of the elongated hole 64A.

  In the present embodiment, since the position of the turbulence generating section 61 can be adjusted on the holding section 62, the appropriate position of the turbulence generating section 61 can be easily and flexibly adjusted in the bag opening process. Note that the position adjustment mechanism of the turbulence generating section 61 with respect to the holding section 62 is not particularly limited.

  As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various changes may be added to the above embodiment. For example, in the above-described third embodiment, the turbulence generating unit 61 is held by the holding unit 62 so that the position of the nozzle 50 with respect to the outlet 50A can be adjusted, so that the turbulence generating unit can be properly adjusted in the bag opening process. The position of 61 can be easily and flexibly adjusted. Instead of such an embodiment, by making the relative position between the outlet 50A and the bag holding device 11 adjustable, the position of the turbulence generating portion 61 can be adjusted appropriately in the bag opening process. Good. In this case, for example, the nozzle 50 may be configured to be able to be separated from and attached to the gripper 22 of the bag holding device 11, or the gripper 22 may be configured to be able to be separated and connected to the nozzle 50. Is also good.

DESCRIPTION OF SYMBOLS 10 ... Bag processing machine 11 ... Bag holding device 12 ... Nozzle device 22 ... Gripper 50 ... Nozzle 50A ... Outlet 50B ... Internal channel 51 ... Compressed air supply source 52 ... Tube 53 ... Open / close valve 60 ... Nozzle attachment 61 ... Generating part 62 ... holding part 63 ... base 63A ... bolt hole 63B ... bolt 64 ... leg 64A ... long hole 64B ... bolt 100 ... bag 101 ... mouth

Claims (11)

A bag holding device for holding bags,
A nozzle device for opening the mouth of the bag held by the bag holding device,
The nozzle device is a nozzle that blows out a gas toward the mouth of the bag held by the bag holding device, and a gas that is formed between the blowout opening of the nozzle and the mouth of the bag and in the nozzle. And a turbulence generating unit that is arranged in at least one of the internal flow paths and generates turbulence in the flow of gas blown out by the nozzle. The bag holding device grips both side edges of the bag located on both sides of the mouth, and has a pair of grippers configured to be able to be separated from and connected to each other,
The bag processing machine according to claim 1, wherein the bag holding device causes the pair of grippers to approach each other at the same time as or after the start of blowing of gas by the nozzle. The turbulence generator is a rod-shaped member,
3. The bag processing machine according to claim 1, wherein the turbulence generating portion extends across the center axis when viewed in an axial direction of a center axis of the outlet of the nozzle. 4.   When viewed in the axial direction of the central axis of the outlet of the nozzle, a longitudinal direction of the turbulence generating portion is orthogonal to a direction in which both side edges of the bag located on both sides of the mouth face each other. Item 3. A bag processing machine according to Item 3. The nozzle device is fixed to the nozzle, and further includes a holding unit that holds the turbulence generating unit,
The bag according to any one of claims 1 to 4, wherein the holding unit holds the turbulence generating unit such that the turbulence generating unit is disposed between the outlet of the nozzle and the mouth of the bag. Processing machine.   The bag processing machine according to claim 5, wherein the turbulence generating unit is held by the holding unit such that a position with respect to the outlet is freely adjustable.   The bag processor according to any one of claims 1 to 6, wherein a relative position between the outlet and the bag holding device is adjustable. A holding step of holding the bag,
A bag opening step of opening the mouth of the bag by blowing out the gas in a turbulent state toward the mouth of the held bag. In the holding step, both side edges of the bag located on both sides of the mouth are gripped by a pair of grippers configured to be detachable from each other,
The bag opening method according to claim 8, wherein in the bag opening step, the pair of grippers are brought close to each other at the same time as or after the start of blowing of the gas. A nozzle that blows gas toward the mouth of the bag,
Disturbance that is arranged at least outside the nozzle at a position facing the outlet of the nozzle and at an internal flow path of gas formed in the nozzle, and generates a disturbance in the flow of gas blown out by the nozzle. And a nozzle unit for bag opening processing. A nozzle attachment detachably attached to a nozzle that blows gas toward the mouth of the bag,
A holding portion detachably fixed to the nozzle,
A nozzle attachment, comprising: a turbulence generating unit that is held by the holding unit so as to face the outlet of the nozzle outside the nozzle and generates turbulence in the flow of gas blown out by the nozzle.