JP4250118B2 - Packaging bag pressing mechanism and seal check device having the same - Google Patents

Description

  The present invention relates to a pressing mechanism for pressing a packaging bag and a seal check device including the same, and belongs to the technical field of quality inspection of packaging bags.

  In general, in a packaging bag in which contents such as snacks are packaged, a seal check may be performed in order to find an item whose contents are likely to deteriorate quickly due to a seal failure. As a device for performing such a seal check, for example, there is a seal check device disclosed in Patent Document 1.

  In the seal check device described in Patent Document 1, in the process of transporting the packaging bag supplied by the upstream transport conveyor while being sandwiched by the upper and lower transport conveyors, the packaging bag is removed by the pressing member assembled to the upper transport conveyor. A seal check of the packaging bag is performed by detecting the amount of displacement of the pressing member at that time or the pressing reaction force acting on the pressing member.

  And even if there are minute holes, tears, etc. in the vertical seal part of the packaging bag supplied with the vertical seal part facing the upper conveyor, the air inside the packaging bag is exposed to the outside when pressed. The transport belt on the upper transport conveyor side is mesh-shaped so that an escape path is secured, and a number of grooves that are inclined in a direction different from the transport direction are formed on the top plate that presses the packaging bag via the belt. Thus, the seal check of the packaging bag supplied in the above-described direction is properly performed.

JP 2003-156403 A

  By the way, in the seal check device described in Patent Document 1, even if a top plate having a mesh and a groove is used, the vertical seal portion is pressed by a pressing plate via the conveyance belt. However, it is still difficult to reliably detect a packaging bag having a seal failure in the pressed portion.

  Therefore, in view of the above situation, the present invention provides a packaging bag pressing mechanism and a seal check device including the packaging bag pressing mechanism for reliably detecting a seal failure of a vertical seal portion when performing a seal check of a packaging bag. Is an issue.

  In order to solve the above problems, the present invention is configured as follows.

First, the invention according to claim 1 is directed to a packaging bag having a horizontal seal portion at both ends and a vertical seal portion in a direction orthogonal to the horizontal seal portion at the center of one surface, at least one of which is has a conveying means for conveying said packaging bag, and by the mutual spacing to the cooperating variable upper and lower pair of clamping means, is supplied toward the upstream side in a generally conveying direction the longitudinal sealing portion The present invention relates to a packaging bag pressing mechanism that clamps and transports a packaging bag, and the at least one clamping means is provided with a pressing missing portion that extends in the transport direction and avoids pressing of a vertical seal portion of the packaging bag. The pressed missing portion is configured to become wider toward the downstream side .

  Next, according to a second aspect of the present invention, in the packaging bag pressing mechanism according to the first aspect, each of the pair of upper and lower clamping means has a conveying means for conveying the packaging bag. It is characterized by.

  Further, the invention according to claim 3 is the packaging bag pressing mechanism according to claim 1 or claim 2, wherein the at least one conveying means is provided with the pressing missing portion, It is a gap formed by separating and arranging the conveying member forming the conveying surface in the conveying means on both the left and right sides so as to sandwich the vertical seal portion of the packaging bag supplied from the upstream side.

According to a fourth aspect of the present invention, in the packaging bag pressing mechanism according to the third aspect, the conveying member is a round belt .

The invention according to claim 5 is the packaging bag pressing mechanism according to claim 3 , wherein the conveying member is a mesh belt .

The invention according to claim 6 is the packaging bag pressing mechanism according to any one of claims 3 to 5 , wherein the at least one transport means is a top plate for supporting the transport member. It is characterized by not having.

The invention according to claim 7 is the packaging bag pressing mechanism according to any one of claims 3 to 6, wherein the upper holding means drives the conveying member provided in the holding means. The drive means for doing is assembled | attached .

The invention according to claim 8 is the packaging bag pressing mechanism according to any one of claims 1 to 7, wherein the pair of upper and lower clamping means is configured such that the distance between the upper and lower pairs becomes wider toward the upstream side. It is characterized by.

The invention according to claim 9 is the packaging bag pressing mechanism according to any one of claims 1 to 8, wherein the pair of upper and lower clamping means are connected by a parallel link mechanism. And

The invention according to claim 10 is the packaging bag pressing mechanism according to any one of claims 1 to 9, wherein the pair of upper and lower clamping means is configured such that an initial interval can be adjusted. It is characterized by.

The invention according to claim 11 is the packaging bag pressing mechanism according to any one of claims 1 to 10, wherein an interval between the pair of upper and lower clamping means or a load caused by pressing by the both clamping means is detected. And detecting means for determining the sealing property of the packaging bag based on the interval or load detected by the detecting means .

The invention according to claim 12 relates to a seal check device that performs a seal check of the packaging bag by a pressing operation, and the packaging bag pressing mechanism according to any one of claims 1 to 10 is provided upstream. It is provided.

  First, according to the first aspect of the present invention, at least one clamping means is provided with a press missing portion so as not to press the vertical seal portion of the packaging bag supplied with the vertical seal portion substantially directed in the transport direction. Therefore, when the packaging bag is sandwiched and pressed by a pair of upper and lower clamping means, leakage of air or the like through minute holes or tears in the vertical seal portion of the packaging bag is not hindered. Therefore, since the thickness of the packaging bag having minute holes or tears in the vertical seal portion can be reduced by this pressing process, for example, a seal check device of a type that presses the vertical seal portion with a top plate on the downstream side is connected. Even in such a case, it becomes possible to reliably detect a sealing failure in the vertical seal portion.

In particular, since the pressing missing portion is wider toward the downstream side, for example, the vertical sealing portion of the packaging bag sandwiched between the upper and lower clamping means has a force in the direction of peeling the vertical sealing portion as it is conveyed. Works. Therefore, it is possible to reliably detect the vertical seal portion having a weak sealing property.

In addition, according to the invention described in claim 2 , since the pair of upper and lower sandwiching means has the transport means for transporting the packaging bag, the packaging bag is smoother by the transporting force of both the sandwiching means. It is conveyed to.

According to the third aspect of the present invention, the conveying member forming the conveying surface in the conveying means is separately arranged on both the left and right sides so as to sandwich the vertical seal portion of the packaging bag supplied from the upstream side, thereby forming Since the gap thus formed is used as the pressing missing portion, the pressing missing portion is reliably formed with a relatively simplified configuration.

According to the invention described in claim 4 , the conveying member is a round belt. On the other hand, according to the invention described in claim 5 , the conveying member is a mesh belt. Even when there is a defect such as a minute hole or a tear in a portion other than the vertical seal portion when pressed by the means, a good escape path to the outside such as air in the packaging bag is formed.

According to the invention described in claim 6 , since at least one clamping means does not include a top plate for supporting the conveying member, the conveying member presses along the outer shape of the packaging bag at the time of pressing. When pressing the packaging bag with the top plate across the transport member, if the contents are hard or if the contents are too much and there is little air etc., the top plate is blocked from moving strokes by the contents, and the air etc. in the packaging bag Although it may be difficult to smoothly leak to the outside and detection of defective seals may be difficult, the present invention solves this problem.

According to the seventh aspect of the present invention, since the driving means for driving the conveying member is assembled to the upper clamping means, the weight of the driving means is loaded on the upper clamping means. Therefore, the packaging bag can be favorably pressed by the upper clamping means without providing special pressing means.

According to the invention described in claim 8 , since the distance between the pair of upper and lower clamping means is wider toward the upstream side, the packaging bag is supplied between the clamping means so that the impact is alleviated, and the packaging bag is damaged. Is reduced.

According to the ninth aspect of the present invention, since the pair of upper and lower clamping means are connected by the parallel link mechanism, both the clamping means can operate while stably maintaining a predetermined positional relationship. In addition, when the packaging bag is clamped by the both clamping means, the pressing force acts on the packaging bag more uniformly.

Further, according to the invention described in claim 10 , since the initial interval between the pair of upper and lower holding means waiting for the supply of the packaging bag is adjustable, it is possible to cope with the pressing of the packaging bag having various thicknesses. it can.

According to the eleventh aspect of the present invention, the detection means for detecting the distance between the pair of upper and lower clamping means or the load caused by the pressing by the both clamping means, and the packaging based on the interval or the load detected by the detection means. Since the determination means for determining the sealing property of the bag is provided, the packaging bag pressing mechanism itself has a seal check function, and the apparatus can be made compact.

According to the twelfth aspect of the present invention, since the packaging bag pressing mechanism described above is provided on the upstream side of the seal check device, the packaging bag having a defect in the vertical seal portion is thinned in advance by the pressing mechanism. Therefore, it is possible to reliably detect a packaging bag having a poor seal during a seal check. Further, there is an advantage that a top plate having a simple configuration for pressing the vertical seal portion can be used for the seal check.

  Hereinafter, the packaging bag inspection line according to the embodiment of the present invention will be described.

  First, the packaging bag handled here is manufactured by, for example, a vertical bag making and packaging machine. As shown in FIG. 1, the packaging bag X includes a vertical seal portion X1 and a pair of horizontal seal portions X2, X2. Is provided.

  As shown in FIG. 2, this packaging bag inspection line 1 is arranged between a vertical bag making and packaging machine (not shown) and a boxing device, and is manufactured by a bag making and packaging machine in order from the upstream side. The receiving device 2 for receiving the packaging bag X filled with the contents falling in the direction, the posture correcting device 3 for correcting the posture of the packaging bag X received by the receiving device 2, and the posture correcting device 3 A seal check device 4 having a packaging bag pressing portion 4A for sandwiching and pressing the modified packaging bag X from above and below, and an inspection portion 4B for checking the seal of the packaging bag X previously pressed by the pressing portion 4A, and the seal check A sorting device 5 that sorts the packaging bags X based on the inspection result by the device 4 and an operation unit 6 that is operated to operate the inspection line 1 are provided. Each of these devices 2 to 5 is assembled on a gantry 1a, and the seal check device 4 is generally accommodated in a box-shaped case 1b.

  The receiving device 2 is connected to the posture correcting device 3 immediately downstream, and is a flat belt-type transport conveyor 2a that is inclined downward toward the downstream side, and a pop-out prevention guide that is erected on both the left and right sides of the conveyor 2a. (Only one is shown) 2b, 2b. In this case, the packaging bag X is transferred to the conveyor 2a with the vertical seal portion X1 facing upward.

  The posture correcting device 3 is inclined to the upper side toward the downstream side, and the downstream end thereof rushes to the vicinity of the center in the case 1b, and is a flat belt type lower transport conveyor 11 that also serves as one clamping means of the packaging bag pressing portion 4A. 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, 3b, and 3b, a pair of left and right pairs along the conveying direction b of the packaging bag X suspended and supported by the support member 3a. Restricting members (only one shown) 3c... 3c, a rotating brush 3d for cleaning the lower running surface of the flat belt of the conveyor 11, and the heights of the posture correcting device 3 and the receiving device 2 through the operation of the handle 3e ' And a height adjusting mechanism 3e for adjusting.

  The packaging bag pressing portion 4A, which is a characteristic part of the present invention, shares the above-described lower conveyance conveyor 11 with the posture correction device 3 as a lower holding means, and also serves as a holding means that is opposed to the upper side of the conveyor 11. The upper conveyor 12 is provided.

  The lower conveyor 11 will be described again. The conveyor 11 has a configuration in which an endless flat belt 23 is wound between a pair of rollers 21 and 22. As shown in FIGS. 3 and 4, the flat belt 23 provided on the lower transport conveyor 11 of the packaging bag pressing portion 4A includes an intermediate roller 25 and a guide roller 26 supported by a bracket 24 provided on the gantry 1a. Thus, it is possible to travel stably between the rollers 21 and 22.

  The support frame 27 provided on the downstream side of the lower conveyor 11 is generally box-shaped, and as shown in FIG. 5, a large substantially rectangular opening 27a ′ is provided on the upper surface 27a. An intermediate roller 25 that supports the flat belt 23 is rotatably provided at the upstream end of the support frame 27.

  As shown in FIGS. 3 and 4, a motor 29 is accommodated in a case 28 provided on the gantry 1a. A timing belt 32 is wound around a pulley 30 assembled to the output shaft 29 a of the motor 29 and a pulley 31 assembled coaxially with the downstream roller 21, and the driving force of the motor 29 is applied to the roller 21. To be communicated to. The downstream end of the lower conveyor 11 is supported by a bracket 33 fixed to the case 28.

  The upper transport conveyor 12 has six pulleys 44... 44 assembled to a pair of shafts 42 and 43 rotatably mounted on both ends of a pair of left and right side frames 41 and 41 extending in the transport direction b of the packaging bag X. In addition, two endless round belts 45 and 45 are wound around the corresponding pulleys 44 and 44 along the conveyance direction b. In order to make it possible to adjust the assembly position of the pulleys 44... 44 on the shafts 42 and 43, the D-cut shafts 42 and 43 are used, and the pulleys 44.

  The six round belts 45... 45 are separated and arranged on the left and right sides so as to be separated toward the downstream side with respect to the approximate center in the transport direction b. That is, a gap G is formed between the left and right conveying surfaces formed by the six round belts 45... 45 group, which is a distance s1 on the upstream side and a distance s2 larger on the downstream side than the upstream side. This gap G is set to a dimension wider than the vertical seal portion X1 of the packaging bag X.

  A box-shaped reinforcing frame 46 having four rectangular openings 46a ′... 46a ′ is installed between the side frames 41 and 41 on the upper surface 46a. A motor 48 is attached to the upstream end of one side frame 41 via a bracket 47. A timing belt 51 is wound between a pulley 49 assembled to the output shaft 48a of the motor 48 and a pulley 50 assembled to the end of the upstream shaft 43, and the driving force of the motor 48 is increased. It is transmitted to the shaft 43. The driving of the motors 48 and 29 is controlled so that the round belts 45... 45 of the upper conveyor 12 and the flat belt 23 of the lower conveyor 11 run at the same speed.

  The upper and lower transport conveyors 12 and 11 are connected by a parallel link mechanism 61, and as shown in the figure, the interval is t1 on the upstream side and the interval t2 is smaller on the downstream side than the upstream side. In that case, the interval t1 is set smaller than the thickness of the packaging bag X introduced into the packaging bag pressing portion 4A.

  The parallel link mechanism 61 has three link members 62... 62 having the same dimensions arranged in the front, rear, left and right, and one link member 63 longer than these. A pair of shafts 64 and 65 are installed on the support frame 27 of the lower conveyor 11. On the other hand, a pair of shafts 66 and 67 are installed on the side frames 41 and 41 of the upper conveyor 12, and the installation positions of these shafts 66 and 67 can be changed on each side frame 41. Three holes 41a to 41c and 41d to 41f are provided on the upstream and downstream sides, respectively. In the illustrated example, a shaft 66 is installed via a pair of downstream holes 41b and 41b, and a shaft 67 is installed via a pair of upstream holes 41e and 41e.

  The lower end portions of the downstream link members 62, 62 are connected to the end portion of the downstream shaft 64 of the lower transport conveyor 11, and the upper end portion is connected to the end portion of the downstream shaft 66 of the upper transport conveyor 12. The lower end of one upstream link member 62 is connected to the end of the upstream shaft 65 of the lower conveyor 11 and the upper end is connected to the end of the upstream shaft 67 of the upper conveyor 12. ing.

  On the other hand, the lower end of the upstream long link member 63 is connected to the end of the upstream shaft 65 of the lower transport conveyor 11 in the vicinity of the center, and the upper end is the end of the upstream shaft 67 of the upper transport conveyor 12. It is connected to the part. A stopper 68 is provided so as to be in contact with the lower end portion. This stopper 68 gives the bottom dead center of the upper conveyor 12 by restricting the swing of the link member 63 swinging in the direction of arrow c with the shaft 65 as a fulcrum, and moves to the support frame 27 in the upstream and downstream directions. The initial values of the intervals t1 and t2 are set by appropriately adjusting the installation position.

  As shown in FIG. 6, the inspection unit 4 </ b> B performs a seal check of the packaging bag X by a pressing operation, and includes a transport unit 71 and a pressing unit 72 disposed above the unit 71.

  The transport unit 71 includes a lower transport conveyor 81. The lower conveyance conveyor 81 is an endless flat between a pair of rollers 83 and 84 rotatably supported at both ends of a pair of left and right side frames (only one shown) 82 and 82 extending in the conveyance direction b of the packaging bag X. The belt 85 is wound around. A motor 86 is attached below the lower end of the lower conveyor 81. A timing belt 89 is wound between a pulley 87 assembled on the output shaft of the motor 86 and a pulley 88 assembled coaxially with the downstream roller 83, and the driving force of the motor 86 is applied to the roller 83. It is to be transmitted.

  In the vicinity of the upstream end of the lower conveyor 81, a line sensor type bag sensor 90 including a light emitting unit and a light receiving unit for detecting the carry-in of the packaging bag X is disposed.

  The pressing unit 72 includes an upper transport conveyor 91, an upper main body 92, and a parallel link mechanism 93 that connects the two, and is supported by the case 1b via a support mechanism 94 so as to be movable up and down.

  The upper conveyer 91 cooperates with the lower conveyer 81 to convey the packaging bag X while pressing it. The upper conveyer 91 includes a pair of left and right side frames (only one shown) 101, 101 whose upper side is inclined upward. A flat belt 105 forming a conveying surface is wound around rollers 102, 103, 104 that are rotatably supported at both end portions and intermediate portions of the side frames 101, 101, respectively, and the side frames A top plate 106 for supporting the flat belt 105 is attached to the lower part of the 101, 101.

  The upper conveyor 91 is connected to the parallel link mechanism 93 via a connecting frame 107. The connecting frame 107 is attached to the upper conveyor 91 via knob bolts 108... 108, and a roller 109 for pressing the flat belt 105 from above is rotatably supported at the upstream end of the connecting frame 107.

  The parallel link mechanism 93 has four link members (only two on the front side are shown) 111, 112,. That is, the upper ends of the three link members 112... 112 are connected to a pair of shafts 113 and 114 installed on the main body 92, and the lower ends are connected to a pair of shafts 115 and 116 installed on the connection frame 107. It is connected. However, the upper end portion of the link member 112 on the front side in the figure is fixed to the shaft 114.

  The vicinity of the upper end portion of one link member 111 on the downstream side is connected to the shaft 113, and the lower end portion is connected to the shaft 115. This link member 111 is longer than the other link members 112... 112, and an upper end portion thereof can be brought into contact with a stopper 117 provided in the vicinity. The stopper 117 gives the bottom dead center of the upper transport conveyor 91 by restricting the swing of the link member 111 swinging in the direction of arrow d with the shaft 113 as a fulcrum. An initial height u with respect to the transfer conveyor 81 is set. The height u is smaller than the thickness of the packaging bag X introduced into the inspection unit 4B.

A motor 121 for driving the upper conveyor 91 is accommodated in the main body 92, and a pulley 122 assembled to the output shaft of the motor 121 and one end of the shaft 113 installed on the main body 92. A first timing belt 124 is wound around the assembled pulley 123. A second timing belt 125 is provided between a pulley (not shown) assembled to the other end of the shaft 113 and a pulley (not shown) assembled to one end of the shaft 115 installed on the connecting frame 107. It is wrapped around. A third timing belt 128 is wound between a pulley 126 assembled at the other end of the shaft 115 and a pulley 127 assembled coaxially with the downstream roller 102 of the upper conveyor 91. Accordingly, the driving force of the motor 121 is transmitted to the roller 102 via the first to third timing belts 124, 125, and 128, and the flat belt 105 can travel. The driving of the motors 121 and 86 is controlled so that the flat belt 105 of the upper transfer conveyor 91 and the flat belt 85 of the lower transfer conveyor 81 travel at the same speed.

  A servo motor 131 for detecting a displacement amount based on a pressing reaction force acting on the upper conveyor 91 by pressing the packaging bag X is accommodated in the main body 92. The shaft 131a of the motor 131 and the main body 92 are accommodated. Are connected to the upstream shaft 114 by first to third connecting members 132 to 134. In that case, the first connecting member 132 is fixed to the shaft 131 a and the third connecting member 134 is fixed to the shaft 114. As a result, the displacement of the upper conveyor 91 becomes the rotation indicated by the arrow d of the shaft 114 via the link member 112 on the front side in the figure, and this rotation is caused by the servo motor 131 via the first to third connecting members 132 to 134. As a result, a rotational force corresponding to the displacement acts on the shaft 131a.

  As shown in FIGS. 6 and 7, the support mechanism 94 supports the pressing unit 72 in the case 1 b via the main body 92, and includes three attachment members 142 installed between the main body 92 and the base member 141. ... cantilevered via 142. A female screw block 144 is attached to the base member 141 via a bracket 143, and a screw shaft 145 extending vertically is screwed into the female screw block 144.

  Guide blocks 146 and 146 are fixed to both sides of the base member 141 with the bracket 143 interposed therebetween, and guide rods 147 and 147 extending vertically are provided on the guide blocks 146 and 146, respectively. Fixed frames 148 and 148 are attached to upper and lower ends of the screw shaft 145 and guide rods 147 and 147, respectively. As a result, when the screw shaft 145 rotates, the female screw block 144 moves up and down along the screw shaft 145, and as a result, the main body 92 and thus the upper transport conveyor 91 move up and down, and the initial height of the upper transport conveyor 91 with respect to the lower transport conveyor 81. u can be adjusted.

  As shown in FIG. 2, the sorting device 5 includes a flat belt type conveyor 5a and air jets arranged on both sides of the conveyor 5a at locations near the upstream end of the conveyor 5a (only one is shown). 5b, 5b. Thereby, based on the inspection result by the seal check device 4, for example, a normal packaging bag X is passed through and led to a downstream packaging device, or one of the air jets 5b and 5b is operated, thereby causing an abnormal packaging bag. X can be distributed to any side along the conveyance direction b.

  In addition to the power switch (not shown), the operation unit 6 includes an operation panel 6a for performing various settings and operations necessary for operation of the packaging bag inspection line 1, and a printer 6b for printing out the inspection results, for example. Have.

  Next, the operation of the packaging bag inspection line 1 will be described.

  When the packaging bag X filled with the contents is manufactured by the upstream bag making and packaging machine, the dropped packaging bag X is received by the receiving device 2 and delivered to the posture correcting device 3 with the vertical seal portion X1 facing upward. It is. In the posture correcting device 3, the packaging bag X is moderated in content by the rotating brushes 3b... 3b, and the rotating brushes 3b... 3b and the regulating members 3c. After the seal portion X1 is set in a posture substantially along the transport direction b, it is delivered to the packaging bag pressing portion 4A of the seal check device 4.

  When the packaging bag X is supplied to the packaging bag pressing portion 4A, the upper transport conveyor 12 waiting at the initial intervals t1 and t2 smaller than the thickness of the packaging bag X is pushed up, and the packaging bag X is moved up and down by the upper and lower transport conveyors 12 and 11. Are conveyed while being pressed by the weight of the upper conveyor 12 and delivered to the inspection unit 4B.

  When the packaging bag X is supplied to the inspection unit 4B, the upper transport conveyor 91 waiting at an initial height u smaller than the thickness of the packaging bag X is pushed up, and the packaging bag X is sandwiched between the upper and lower transport conveyors 91 and 81. The upper conveyance conveyor 91 is pressed while being conveyed, and the displacement amount in the height direction of the upper conveyance conveyor 91 is detected by the servo motor 131, and a seal check is performed based on the detection result. In that case, in the packaging bag X with a normal seal, since the pressing reaction force by the packaging bag X is large, the displacement amount of the upper transport conveyor 91 during the pressing is small or does not fluctuate. Since the pressing reaction force by the packaging bag X decreases due to leakage of air or the like, the amount of displacement of the upper transport conveyor 91 during pressing is large.

  The packaging bag X for which the seal check by the inspection unit 4B has been completed is delivered to the sorting device 5, and the packaging bag X determined to be abnormal as a result of the inspection is actuated by the air jets 5b and 5b in a predetermined direction, that is, the conveying direction. Sorted to the side of b and collected. And the packaging bag X determined to be normal passes through and is supplied to the downstream boxing device.

  In that case, a packaging bag pressing portion 4A is provided on the upstream side of the inspection portion 4B of the seal check device 4, and as shown in FIG. 8, the vertical seal portion X1 is generally conveyed in the conveying direction on the upper conveying conveyor 12 of the pressing portion 4A. Since a gap G is provided as a press missing part so as not to press the vertical seal part X1 of the packaging bag X conveyed on the flat belt 23 of the lower conveyor 11 toward b, the upper and lower conveyors 12, 11, that is, when the packaging bag X is sandwiched and pressed by the round belt 45... 45 and the flat belt 23, leakage of air or the like through a minute hole or tear in the vertical seal portion X1 of the packaging bag X is obstructed. Not. Accordingly, since the thickness of the packaging bag X having minute holes or tears in the vertical seal portion X1 can be reduced by this pressing process, the top plate 106 having a simple configuration on the downstream side as in the present embodiment can be used. Even when the inspection unit 4B that performs the seal check of the type that presses the vertical seal portion X1 is connected, it is possible to reliably detect the seal failure of the vertical seal portion X1.

  Further, since the packaging bag X is sandwiched between the upper and lower transport conveyors 12 and 11 in the packaging bag pressing portion 4A, the packaging bag X is transported more smoothly by the transport force of both the transport conveyors 12 and 11.

  Further, the round belts 45... 45 forming the conveyance surface in the upper conveyance conveyor 12 are separately arranged on the left and right sides so as to sandwich the vertical seal portion X1 of the packaging bag X supplied from the upstream side, and the gap G formed thereby. Therefore, the pressing missing portion is reliably formed with a relatively simplified configuration.

  Further, since the gap G of the round belts 45... 45 group separated on the left and right sides is wider toward the downstream side, that is, the downstream distance s2 is larger than the upstream distance s1, the upper round belt 45. For example, a force in a direction to peel off the vertical seal portion X1 acts on the vertical seal portion X1 of the packaging bag X sandwiched between the flat belts 23, for example, in the form of a palm. Therefore, in the case of the packaging bag X having the vertical seal portion X1 having a weak sealability, the vertical seal portion X1 is peeled off by pressing and air or the like leaks, so that the thickness is reduced, and this kind of inspection in the downstream inspection portion 4B is performed. Anomaly detection is ensured.

  Moreover, since the conveyance member which forms the conveyance surface of the upper conveyance conveyor 12 is the round belt 45 ... 45, even if there is a defect such as a minute hole or tear in a portion other than the vertical seal portion X1, the inside of the packaging bag X The escape route to the outside such as air is well formed. In particular, by using the round belts 45... 45, the gap G, that is, the missing press portion is made wider toward the downstream side while the round belts 45. Easy to configure.

  Further, since the upper and lower conveyors 12 and 11 do not include a round belt 45... 45 or a top plate for supporting the flat belt 23, the round belt 45. Press along. When the packaging bag X is pressed with the top plate with the round belt 45... 45 or the flat belt 23 sandwiched between them, if the contents are hard or the contents are too much and there is little air etc., the top plate is prevented from moving by the contents. The air in the packaging bag X may not be smoothly leaked to the outside and it may be difficult to detect a sealing failure. However, this problem is solved by not providing a top plate as in this embodiment. .

  That is, as shown in FIG. 9, the upper and lower transport conveyors 12 and 11 that transport the packaging bag X in the direction of the arrow b do not include a top plate, so that round belts (one on the near side) that form the respective transport surfaces are provided. (Only shown) 45... 45 and the flat belt 23 are sandwiched and pressed so as to be appropriately along the packaging bag X. Accordingly, a pressing force is applied to the packaging bag X relatively evenly as indicated by an arrow, and if there is an abnormality, leakage of air or the like from the packaging bag X becomes smooth.

  Further, as shown in FIG. 3, the motor 48 for driving the round belts 45... 45 is assembled to the upper transport conveyor 12, so that the weight of the motor 48 is loaded on the upper transport conveyor 12. Therefore, the packaging bag X can be favorably pressed by the upper transport conveyor 12 without providing special pressing means. In addition, when further pressing force is required, an appropriate means such as a weight, a spring, or a cylinder may be added.

  Moreover, since the space | interval of the upper and lower conveyors 12 and 11 is so wide that it is upstream, that is, the space | interval t1 of upstream is larger than the space | interval t2 of downstream, both the conveyors 12 and 11 so that an impact may be eased in the packaging bag X. In this way, damage to the packaging bag X is reduced.

  Moreover, since the upper and lower conveyors 12 and 11 are connected by the parallel link mechanism 61, both the conveyors 12 and 11 can operate while maintaining a predetermined positional relationship stably. In addition, when the packaging bag X is sandwiched between the conveyors 12 and 11, the pressing force acts on the packaging bag X more uniformly.

  That is, as shown in FIG. 10, the packaging bag X is introduced between the lower transport conveyor 11 and the upper transport conveyor 12 indicated by the chain line that waits while maintaining the initial intervals t1 and t2 above the lower transport conveyor 11. Then, the link member (only two on the front side) 62... 62, 63 of the parallel link mechanism 61 are moved in the direction of the arrow c 'with the shafts 64, 65 as fulcrums by the entry of the packaging bag X having a thickness larger than the interval t1. As a result of swinging, the upper transport conveyor 12 connected to the link members 62... 62, 63 via the shafts 66, 67 presses the packaging bag X by its own weight while being pushed up as shown by the solid line. As described above, since the parallel link mechanism 61 is provided, the positional relationship of the upper transport conveyor 12 being pushed up or being pressed with respect to the lower transport conveyor 11 is stably maintained. Note that the bottom dead center of the upper conveyor 12 is realized by contact between the stopper 68 and the lower end of the long link member 63.

  In addition, since the initial interval between the upper and lower transport conveyors 12 and 11 waiting for the supply of the packaging bag X can be adjusted, it is possible to cope with pressing of the packaging bags X having various thicknesses.

  That is, first, as shown in FIG. 11A, the shafts 66 and 67 are respectively connected through the holes 41c and 41f of the six convenient holes 41a to 41f provided in the side frames 41 of the upper conveyor 12. Erection. Then, link members (only two on the front side are shown) 62... 62, 63 extending from the lower conveyor 11 are attached to the ends of these shafts 66, 67. Thereby, when the lower end portion of the upstream side link member 63 swinging around the shaft 65 abuts against the stopper 68, the interval t3 larger than the interval t1 between the upper and lower conveyors 12, 11 shown in FIG. An interval t4 smaller than the interval t2 is obtained, and the inclination of the upper conveyor 12 with respect to the lower conveyor 11 is set large.

  On the other hand, as shown in FIG. 11 (b), shafts 66 and 67 are installed via holes 41a and 41d, among the six holes 41a to 41f provided on each side frame 41 of the upper conveyor 12, respectively. To do. And the link members 62 ... 62, 63 extended from the lower conveyance conveyor 11 are attached to the edge part of these shafts 66,67. As a result, when the lower end portion of the upstream link member 63 swinging around the shaft 65 abuts against the stopper 68, the upstream end and the downstream end of the upper and lower transfer conveyors 12 and 11 become the same interval t5, and both transfer The conveyor surfaces of the conveyors 12 and 11 are parallel to each other. The positions and number of the holes 41a to 41f are merely examples, and may be appropriately changed according to the size and shape of the packaging bag X to be handled.

  In the above-described embodiment, the round belts 45... 45 are used as the transport members of the upper transport conveyor 12 of the packaging bag pressing unit 4A, but a mesh belt may be used instead.

  That is, as shown in FIG. 4, instead of the side frames 41 and 41 that are parallel to each other, like the side frames 41 'and 41' of the upper conveyor 12 'shown in FIG. A predetermined section is inclined with respect to the conveying direction b by a predetermined angle, and a roller 43 'and a motor 48' are attached to each inclined portion on the upstream side, and a roller 42 'is attached on the downstream side. An endless mesh belt 45 ′ is wound around the corresponding rollers 42 ′ and 43 ′. In that case, the angle of the inclined portion is set so that the gap G between the pair of mesh belts 45 ′ and 45 ′ is a distance s 1 on the upstream side and a distance s 2 slightly larger on the downstream side.

  The driving force of each motor 48 'is transmitted to each upstream roller 43' by a driving force transmission mechanism (not shown), and each mesh belt 45 'travels. In that case, the pair of mesh belts 45 'and 45' arranged separately travel at the same speed.

  Thereby, the same operation as that obtained when the conveying surfaces separated and arranged by the round belts 45... 45 are formed can be obtained. In particular, the use of the mesh belts 45 ′ and 45 ′ has an advantage that the packaging bag X can be stably held in cooperation with the lower flat belt 23.

  Moreover, in the said embodiment, the round belt 45 ... 45 which forms the conveyance surface of the upper conveyance conveyor 12 of the packaging bag press part 4A is driven with the motor 48, or the mesh which forms the conveyance surface of the upper conveyance conveyor 12 ' Although the belts 45 ′ and 45 ′ are driven by the motors 48 ′ and 48 ′, the conveyance surface may be formed by a large number of small free rollers to maintain the smooth conveyance of the packaging bag X.

  Moreover, in the said embodiment, although the top plate was not provided in the upper and lower conveyance conveyors 12 and 11 of the packaging bag press part 4A, according to the property of the packaging bag X supplied, for example, a top plate is set to the lower conveyance conveyor 11 You may make it provide.

  Further, a seal check function may be added to the packaging bag pressing portion 4A. For example, as shown in FIG. 13, the packaging bag pressing portion 4A ′ thus provided is provided with a servo motor 131 ′ having a displacement detection function in the same manner as the servo motor 131 of the above-described embodiment. That is, a connecting member is provided between the link member 62 and the shaft of the servo motor 131 'so that the displacement of the upper conveyor 12 is detected as the rotation of the servo motor 131'.

  A control unit 150 is provided for outputting control signals to the motors 48 and 29 for driving the upper and lower transport conveyors 12 and 11 and for inputting detection signals from the servo motor 131 '. Then, the control unit 150 determines whether the seal of the packaging bag X is normal or abnormal based on the input detection signal. Thereby, the packaging bag pressing portion 4A ′ itself has a seal check function, and the packaging bag pressing portion 4A and the inspection portion 4B in the above-described seal checking device 4 are integrated, so that the device can be made compact. .

  As described above, according to the present invention, when performing a seal check on a packaging bag, a packaging bag pressing mechanism and a seal check device including the same are provided so that a seal failure in a vertical seal portion can be reliably detected. Is done. That is, the present invention is widely suitable for the technical field of quality inspection of packaging bags.

It is a top view of the packaging bag handled with the packaging bag inspection line which concerns on embodiment of this invention. It is a side view which shows schematic structure of a packaging bag test | inspection line. It is a side view of a packaging bag press part. It is also a plan view. It is a top view of the support frame of a lower conveyance conveyor similarly. It is a side view of an inspection part. It is a principal part expanded arrow line view by the II-II line of FIG. It is a principal part top view for demonstrating the effect | action which provided the clearance gap in the packaging bag press part. It is a principal part side view for demonstrating the effect | action of not providing the top plate similarly. It is a principal part side view for demonstrating the effect | action of the parallel link mechanism in a packaging bag press part. It is a principal part side view for demonstrating the effect | action of having made the space | interval of the upper and lower conveyance conveyors in a packaging bag press part variable, Comprising: When (a) enlarges the inclination of an upper conveyance conveyor, (b) This shows a case in which the conveyors are parallel to each other. It is a schematic plan view at the time of using a mesh belt for the upper conveyance conveyor in a packaging bag press part. It is a block diagram which shows the control system of the packaging bag press part provided with the seal | sticker check function.

Explanation of symbols

4 Seal check device 4A Packaging bag pressing part (packaging bag pressing mechanism)
11 Lower transport conveyor (clamping means, transport means)
12 Upper conveying conveyor (Nipping means, conveying means)
45 Round belt (conveying member)
45 'mesh belt (conveying member)
48 Motor (drive means)
61 Parallel link mechanism 131 ′ Servo motor (detection means)
150 Control unit (determination means)
G Gap (Press missing part)
X Packaging bag X1 Vertical seal

Claims (12)

Both ends has a transverse seal portion directed to a packaging bag having a vertical seal portion in a direction orthogonal to the transverse seal portion substantially at the center of one surface, the conveying means for at least one of transporting the packaging bag a, and by mutual interval has the cooperating variable upper and lower pair of clamping means, for pressing while conveying by sandwiching the packaging bag to be supplied toward the generally conveying direction the vertical seal portion from the upstream side A packaging bag pressing mechanism, wherein the at least one clamping means is provided with a pressing missing portion that extends in the transport direction and avoids pressing of the vertical seal portion of the packaging bag, and the pressing missing portion is provided on the downstream side. A packaging bag pressing mechanism characterized in that it is configured to become wider .   2. The packaging bag pressing mechanism according to claim 1, wherein each of the pair of upper and lower clamping means has a conveying means for conveying the packaging bag.   The at least one conveying means is provided with the press missing portion, and the missing portion sandwiches the vertical seal portion of the packaging bag supplied from the upstream side with the conveying member forming the conveying surface in the conveying means. The packaging bag pressing mechanism according to claim 1, wherein the packing bag pressing mechanism is a gap formed by separately arranging the left and right sides of the packaging bag. The packaging bag pressing mechanism according to claim 3, wherein the conveying member is a round belt . The packaging bag pressing mechanism according to claim 3 , wherein the conveying member is a mesh belt . The packaging bag pressing mechanism according to any one of claims 3 to 5, wherein the at least one transport unit does not include a top plate for supporting the transport member . The packaging bag press according to any one of claims 3 to 6, wherein a driving means for driving the conveying member provided in the clamping means is assembled to the upper clamping means. mechanism. The upper and lower pair of clamping means, packaging bag pressing mechanism according to any one of claims 1 to 7, characterized in that it is configured as upstream interval becomes wider. The packaging bag pressing mechanism according to any one of claims 1 to 8, wherein the pair of upper and lower clamping means are connected by a parallel link mechanism. The packaging bag pressing mechanism according to any one of claims 1 to 9, wherein the pair of upper and lower clamping means is configured such that an initial interval can be adjusted . Detection means for detecting a load between the pair of upper and lower clamping means or a pressure caused by pressing by both clamping means , and determination means for judging the sealing performance of the packaging bag based on the interval or load detected by the detection means packaging bag pressing mechanism as claimed in any one of claims 10, characterized in that are. A seal check device for performing a seal check on a packaging bag by a pressing operation, wherein the seal check device is provided with the packaging bag pressing mechanism according to any one of claims 1 to 10 on the upstream side. .

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