JP4430196B2 - Bag bottom receiving device in rotary type bag filling and packaging machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a rotary type bag filling and packaging machine, and more particularly to a bag bottom receiving device in the packaging machine.
[0002]
[Prior art]
Conventionally, a bagging and packaging machine for automatically bagging and packaging foods and the like has been used. As one type, a gripper for gripping a bag is mounted on a rotating table, and a predetermined circumference is provided around the table. Each device for performing operations such as opening the bag mouth, filling the contents, sealing the bag mouth, etc. at intervals of, and gripping the bag with the gripper, rotating this table while holding it, 2. Description of the Related Art A rotary type bag filling and packaging machine (hereinafter simply referred to as a packaging machine) in which bags are sequentially passed and packed and packaged is known.
[0003]
By the way, some of the products packaged and packaged in this way have a relatively small weight, but some products have a weight of 3 kg or more. The gripper usually has a configuration in which both side edges of the bag are clamped near the bag mouth of the bag. And in order to improve working efficiency, the rotation of the table is increased. When the speed is increased in this way, and particularly in the case of a heavy product, the inertial force acting on the bag containing the contents exceeds the gripping force by the gripper, and the gripper and the bag are rotated during rotation or at the start and stop of rotation. Even when the bag is detached from the gripper or does not come off, the posture of the bag is deviated. In this case, for example, the bag mouth seal or the like is hindered.
[0004]
In order to solve such a problem, for example, a structure is conceivable in which a cradle for receiving and supporting the bottom of the bag is attached to the rotary table so as to be movable up and down and rotated integrally with the table. However, when this configuration is adopted, interference with other devices used in each process occurs. For example, after the contents are filled, the air is removed from the bag. As a deaeration device for this purpose, there are many cases of using a pressing plate that is spaced in the radial direction of the rotary table, faces each other, and sandwiches a bag therebetween. On the other hand, the cradle is provided with an elevating mechanism including a vertically extending guide shaft for moving it up and down, etc., and these rotate with the rotary table, so that they interfere with the deaeration device, and the arrangement of the deaeration device Cause difficulties.
[0005]
Japanese Patent Laid-Open No. 11-157502 shows a configuration in which a support plate for supporting the bottom of a bag is provided on a machine base, not a transfer table, in a device for filling a gusset type bag with liquid food. Yes. The support plate is provided only at the filling station or over the range from the filling station to the cap supply station or the cap clamping station. And this support plate raises when the conveyance table which holds a container and performs intermittent rotational movement stops at a predetermined position, and descends before starting rotation for moving to the next position. . Accordingly, a large force acts on the member holding the bag from the bag during rotation or at the start or stop of rotation. In Japanese Patent Application Laid-Open No. 11-157502, it is applied to a gusset type bag with a cap, and a configuration in which the flange of the cap is inserted into a notch of the transfer table and is suspended is employed. There is little possibility of coming off the transfer table due to impact or the like. However, since a large impact force acts on the holding portion of the bag as described above, the same problem as described above arises in the type in which the stopper is not attached and the bag is suspended by holding the vicinity of the bag mouth. In addition, there is a possibility that the contents spill due to an impact at the start or stop of rotation. If the container is slid on the support plate while the support plate is raised during the rotation, a pinhole may be formed on the bottom of the bag, or the bag may be inclined and the contents may be spilled.
[0006]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and the bag gripping device is caused by a large impact caused by the inertia of the bag containing the contents during the rotation of the rotary table and at the start and stop of the rotation. It is an object of the present invention to provide a bag bottom receiving device in a rotary type bag filling and packaging machine so as not to be added to the bag.
[0007]
It is another object of the present invention to provide a bag bottom receiving device that secures a space for arranging various devices provided for each process and does not interfere with these devices during rotation of the rotary table.
[0008]
Furthermore, it is another object of the present invention to reduce the impact at the time of starting and stopping the rotation of the rotary table and prevent the contents in the bag from splashing out.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a rotary table, a rotary table driving device that drives the rotary table , and both side edges near the bag mouth of the packaging bag that are attached to the rotary table are gripped. In the bag bottom receiving device in the rotary type bag filling and packaging machine provided with a plurality of grippers for holding the packaging bag in a suspended state, the bag is disposed around the same axis as the rotary table below the rotary table. An annular rotating rail, a plurality of support columns that are positioned inside the rotating rail, and that rotatably support the rotating rail by engaging rotatable supporting rollers provided at the respective upper ends of the rotating rail, and the rotating rail A rotating rail driving device for driving the rotating table is provided, and the rotating rail is rotated in a predetermined relationship with the rotating state of the rotary table. Then, on the outer peripheral side of the rotary rail, a bag bottom cradle is mounted on the outer peripheral side of the rotary table at a position corresponding to the gripper so that it can be raised and lowered, and as the rotary rail rotates, the bag bottom cradle An elevating device for elevating and lowering was provided. The lifting device lifts and lowers the bag bottom receiving base between a rising position where the bag bottom receiving base abuts against the bottom of the bag and a lowering position that is lowered from the rising position and separated from the bottom of the bag. The bag bottom cradle is maintained in the raised position within a predetermined range of the rotation range in which the bag bottom cradle rotates together with the rotating rail. A groove extending in the circumferential direction is formed on the inner periphery of the rotating rail or the outer periphery of the support roller, and the member on the side where the groove is not formed is fitted into this groove, so that the rotating rail is supported by the support column. It has become so.
[0010]
In one embodiment, the portion of the rotating roller and the support roller on the side where the groove is not formed is formed as a protruding portion extending in the circumferential direction.
In still another embodiment, the groove is formed on the outer periphery of the rotating rail, and the protrusion is formed on the outer periphery of the support roller.
[0011]
In still another embodiment, the lifting device is rotatable on each of the lifting cam and the cradle , the cam surface having an upper surface displaced vertically along the circumferential direction of the rotating rail. And a roller driven by a lifting cam.
[0012]
In another embodiment, the rotary rail and the rotary table are rotationally driven by the same drive device at the same rotational speed.
[0013]
In another embodiment, the rotating rail is driven by a driving device different from the rotating table, and the rotating rail is in a rotating state different from the rotating state of the rotating table, for example, the rotating body starts rotating at a slower speed than the rotating table. After that, the motor rotates at a speed exceeding the speed of the rotary table, decelerates again, and stops at a speed slower than the rotary table.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the embodiments described below.
[0015]
FIG. 1 is a schematic configuration diagram of a packaging machine 1 that employs a cradle device according to a first embodiment of the present invention, and FIG. 2 is a process explanatory diagram showing each process. In the figure, reference numeral 4 denotes a base of the box-like machine base 3, and 5 denotes an upper plate of the machine base 3. The rotary table 7 is positioned above the table rotary shaft support stand 11 that rotatably supports the table rotary shaft 9 inserted therein, and is attached to the upper end of the table rotary shaft 9 so as to rotate integrally. The lower side of the support stand 11 extends to the inside of the machine base 3 through an attachment hole 5a formed in the upper plate 5 of the machine base 3, and is attached to the machine base 3 with the flange 12 placed on the upper board 5. It has been.
[0016]
Reference numeral 13 denotes an index device for giving a predetermined intermittent rotation to the table rotation shaft 9, and a drive gear 17 connected to a drive source (not shown) is attached to the input shaft 15. On the other hand, an output gear 18 is attached to the output shaft 16 of the indexing device 13, which meshes with a rotary table gear 19 attached to the lower end of the table rotary shaft 9, so that the rotary table 7 performs predetermined intermittent rotation. It has become. In the present embodiment, ten grippers 23 as gripping devices for the bag 21 are provided on the table 7 at equal intervals in the circumferential direction on the outer peripheral portion of the table 7. The bag 21 is held in a suspended state. The gripper 23 can be of a conventional type, and the description thereof is omitted.
[0017]
Here, the process of the packaging machine in the present embodiment will be described with reference to FIG. 2. Process 1 is a bag supply process, and a bag for packaging using a bag supply device (not shown) which may be of a known type. 21 is supplied to the rotary table side, and the gripper 23 sandwiches the vicinity of both side edges of the upper bag mouth. Step 2 is an opening step, which also uses a known opening device (not shown) using a suction cup or the like to open the bag mouth and send air into the bag through the nozzle to make the bag 21 open. Step 3 is a charging step in which a solid material is charged into the bag 21, and a known charging device (not shown) can also be used for this. Steps 4 to 6 are liquid filling steps. In this embodiment, since the amount of liquid to be filled is large, the working time is increased by dividing the liquid filling process into three processes. Each liquid filling device may be a known one, and the same or different ones can be used. Step 7 is a deaeration and sealing step, and a conventional type deaeration device (not shown) is used to press the bag 21 from both sides with the two pressing plates to release the air in the bag 21 and to seal it. Primary sealing of the bag mouth is performed using a pair of hot rods (not shown) of the apparatus. Then, secondary sealing is performed in step 8, cooling is performed in step 9, and the product packaged in step 10 is discharged onto a conveyor.
[0018]
Next, the bag bottom receiving device 31 of the present invention will be described with reference to FIG. 3 and FIG. The pedestal device (hereinafter referred to as a cradle device) 31 includes an annular rotating rail 33 disposed below the rotary table 7, and the annular rotating rail 33 protrudes toward the center on the inner peripheral portion. A protruding portion 35 is formed. A stand 37 is erected on the upper plate 5 of the machine base 3 and protrudes into a groove 41 formed to extend in the circumferential direction on the outer periphery of a rotating rail support roller 39 rotatably attached to the upper end of the stand 37. By fitting 35, the annular rotating rail 33 is supported at the illustrated position. In the present embodiment, eight stands 37 are provided at positions where the center of the rotary rail 33 coincides with the rotational axis of the rotary table 7.
[0019]
Reference numeral 43 is an annular rack gear fixed integrally to the lower surface side of the rotating rail 33. On the other hand, the rotary rail drive shaft stand 47 is attached to the machine base with its flange 48 placed on the upper plate 5 of the machine base 3, and rotatably supports the rotary rail drive shaft 49 extending through the stand 47. ing. A rail drive shaft gear 53 that is driven by the rotary table gear 19 via an intermediate gear 51 is attached to the lower end side of the drive shaft 49, and a pinion gear 55 that meshes with the rack gear 43 is attached to the upper end side. That is, in this embodiment, the rotary table 7 and the rotary rail 33 are driven by the same drive source via the same index 13 and are simultaneously rotated by the same angle.
[0020]
Reference numeral 57 denotes a bag bottom cradle that receives the bottom 21a of the bag 21 and operates as described below. Then, the center part is depressed, and the horizontal bars 59a, 59b, 59c arranged in parallel with the central part extending obliquely upward are received by the vertical bars 61 that join these horizontal bars at the central part. A portion 63 is configured (FIG. 2), and a pedestal shaft 65 provided downward from the central portion of the receiving portion 63 is provided. Reference numeral 67 denotes a cradle mounting bracket, which includes an outer plate 67a and an inner plate 67b. A shaft guide 69 provided integrally with the bracket 67 is provided on the outer surface of the outer plate 67a, and a pedestal shaft 65 is inserted through a through hole (not shown) formed in the shaft guide 69, not shown. The cradle 57 is positioned and fixed at an appropriate position in the vertical direction with respect to the bracket 67 by appropriate means such as screws. The position can be changed as required. A slide block 71 is attached to the outer surface of the inner plate 67b of the shaft guide 69 of the bracket 67, and a guide rail 73 extending in the vertical direction is provided to the rack gear 43 via a guide rail mounting bracket 75 having an L-shaped cross section. The slide block 71 is fitted in a groove (not shown) which is attached and formed in the guide rail 73 and extends in the vertical direction, and the slide block 71 is guided so as to be movable up and down. Further, with this configuration, the pedestal 57 is positioned in the circumferential direction with respect to the rotating rail 33 and rotates integrally with the rotating rail 33. The circumferential position of the rotating rail 33 of the cradle 57 is positioned below the bag 21 held by the gripper 23. The slide block 71 is moved up and down as will be described later, but the lower limit position can be limited by providing a protrusion (not shown) on the guide rail 73, for example.
[0021]
Reference numerals 77a and 77b denote cradle lift cam mounting stands, and the cradle lift cams 79 are attached to the stands 77a and 77b. On the other hand, on the inner side surface of the inner plate 67 b of the cradle mounting bracket 67, a cradle raising / lowering roller 83 rotatably attached to a roller shaft 81 planted there is attached. When the rack gear 43 and the annular rail 33 are rotated together with the rotary table 7 and the cradle 57 is also rotated, the cradle 57 is moved up and down by rolling the roller 83 on the elevating cam 79. ing.
[0022]
That is, the lifting cam 79 is arranged concentrically with the rotary table 7 as shown in FIG. 2, and from the entrance end 79 a located slightly before the stopping position of the lifting roller 83 in step 3, the lifting roller 83. It extends to the exit side end 79b slightly ahead of the stop position in step 10. And the height is low at the entrance end 79a, and when the roller 83 is loaded while the cradle 57 is moved from the step 2 to the step 3, the cradle 57 is still not as shown in FIG. The bag 21 is located away from the bottom 21a. Then, the cam 79 gradually increases as it advances from the entrance end, and when the cradle 57 stops at the position of the solid material charging step of step 3, the cradle 57 is positioned at the bottom of the bag 21 as shown in FIG. It has reached the height to catch 21a. Then, the height of the cam 79 is gradually lowered slightly before the position corresponding to the stop position of the step 10 with the height exceeding the steps 4 to 9, and when the cradle 57 stops at the position of the discharge step of the step 10, the cradle 57 is located away from the bottom 21a of the bag 21 as shown in FIG. However, it does not necessarily have to be the same height. As described above, the lower limit position of the slide block 71 is appropriately set by means, but the lower limit position may be set at the height of FIG. 3, or slightly lower or slightly lower than that. It may be high. Further, in this embodiment, the lifting cam 79 does not extend over the entire circumference, and the lifting cam 79 is not provided in a range from a little before Step 10 to a position slightly before Step 3, but this range is also included. You may extend and provide in the same height as FIG. In this case, the lower limit position of the cradle 57 is restricted by this portion of the elevating cam 79, and a separate restricting member such as a protrusion provided on the guide rail 73 as described above is unnecessary. Although only two of the cradle raising / lowering cam attachment stands 77a and 77b are shown, an appropriate number of stands 77 are provided as necessary.
[0023]
In the packaging device 1 configured as described above, the receiving table 57 supports the bottom portion 21a of the bag 21 from the solid material charging process 3 to immediately before the discharging process 10, and this receiving table 57 is combined with the turntable 7. Since the rotating table 7 rotates, the inertial force of the bag containing the contents is received by the cradle, both when the rotating table 7 starts rotating and when the rotating table 7 starts rotating. 23, so that the bag 21 is not displaced or detached from the gripping device.
[0024]
FIG. 5 is a schematic configuration diagram of a packaging machine 101 according to the second embodiment of the present invention. In this embodiment, unlike the first embodiment, the drive device for the rotary table 7 and the drive device for the cradle device 31 are separate. That is, the drive device of the rotary table 7 uses the same drive source and index device 13 (not shown) as in the first embodiment, but the servo motor 103 is used as the drive device for the cradle device 31. Yes. The rail drive shaft gear 107 attached to the lower end of the rotary rail drive shaft 49 is meshed with the gear 105 attached to the output shaft of the servo motor 103. Of course, the intermediate gear 51 used in the first embodiment is not used. Description of other configurations is omitted.
[0025]
By using the servo motor 103 in this way, the rotation state of the turntable 7 and the rotation state of the cradle 57 can be made different. In other words, the index used in the rotary type packaging machine determines the rotation angle per rotation when intermittently rotating, and reduces the impact at the start and stop of rotation to reduce the impact at the start and stop of rotation. Usually, the speed is made smaller than the intermediate rotational speed. However, if the weight of the bag is still large, a considerable impact is generated and the contents are splashed out. However, since the servo motor 103 is used as a driving device for the cradle device 31 in the present embodiment, the cradle 57 is set to a lower speed state than the rotary table 7 at the start and stop of rotation, and from the rotary table 7 in the middle. As the high speed, the required rotation time can be substantially the same. The state of movement of the bag 21, gripper 23, and cradle 57 in this case is shown in FIG. As can be seen from the figure, the bottom side starts to rotate at a low speed with respect to the upper side of the bag 21, that is, the bag mouth side, and the movement seems to be delayed at the start of the rotation. However, the delay in the movement of the lower portion of the bag 21 due to the speed difference from the upper portion is absorbed by the deformation of the middle portion of the bag 21, and a large impact due to the weight of the delayed bottom portion does not act on the gripper 23. Then, it becomes high speed, overtakes the upper side of the bag in the middle of the two steps, and it seems to move forward. Also in this case, the shift of the position between the upper portion and the bottom portion of the bag 21 is absorbed by the deformation of the intermediate portion of the bag 21, and a large impact does not act on the gripper 23. When stopped, the speed becomes lower than that of the rotary table 7 again, and the rotary table 7 and the cradle 57 are stopped almost simultaneously. Thereby, when the rotation of the cradle 57 is started and stopped, the impact applied to the bottom 21a side of the bag 21 clogged with the contents becomes extremely small, and the filling material is prevented from jumping out before the bag mouth is sealed. it can.
[0026]
Further, in the first embodiment, the cradle 57 may be attached to the cradle mounting bracket 67 via an elastic body such as a spring so as to absorb the impact at the time of starting and stopping the rotation. Further, the cradle 57 may be provided with a slip stopper that prevents the bag bottom 21a from slipping.
[0027]
【The invention's effect】
As is clear from the above description, according to the present invention, even if the rotary table is rotated while holding the bag containing the heavy contents with the gripping device, the rotation table is rotated during each process and at each process position. When the rotation is started and stopped, a large impact is not applied to the gripping device, so that the bag is not detached from the gripping device or shifted in position.
[0028]
In addition, the rotating body is an annular rotating rail, and a cradle is attached to the outer periphery of the rotating body, so that a space is secured inside the rotating rail and other necessary devices are arranged without interfering with the rotating cradle. It becomes possible.
[0029]
Further, the rotating body drive device is driven by a driving device different from the rotating table, and the rotating body starts rotating at a lower speed than the rotating table, for example, the rotating body starts rotating at a lower speed than the rotating table. By rotating at a speed exceeding the speed of the rotary table, again decelerating to a lower speed than the rotary table and stopping the rotation, the impact generated by the bag containing the contents is kept small, and the contents are prevented from splashing. can do.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a rotary bag filling and packaging apparatus using a cradle device according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining each step.
FIG. 3 is an enlarged view of a substantially 1/3 portion on the left side of FIG. 1;
4 is an enlarged view of a substantially 1/3 portion on the right side of FIG. 1. FIG.
FIG. 5 is a schematic configuration diagram of a rotary-type bag filling and packaging apparatus using a cradle device according to a second embodiment.
FIG. 6 is a diagram showing a state of movement of the bag in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary type bag filling and packaging apparatus 7 Rotary table 9 Rotary table drive shaft 13 Index device 21 Packaging bag 23 Gripper 33 Rotating rail 43 Rack gear 49 Rotating rail drive shaft 57 Receiving base 71 Slide block 73 Guide rail 79 Receiving base lifting cam 83 Roller 103 Servo motor (rotary rail drive)

Claims (7)

A rotary table, a rotary table driving device that intermittently drives the rotary table, and the side table that is mounted on the rotary table, grips both side edges near the bag mouth, and holds the packaging bag in a suspended state. In a bag bottom cradle device in a rotary bag filling and packaging machine provided with a plurality of grippers
Below the rotary table, an annular rotary rail disposed around the same axis as the rotary table;
A plurality of support columns that are positioned inside the rotating rail, each having a rotatable support roller that engages with the rotating rail at an upper end, and rotatably supporting the rotating rail;
A plurality of bag bottom pedestals mounted on the outer peripheral side of the rotary rail so as to be movable up and down at positions corresponding to the grippers in the circumferential direction of the rotary table ;
A rotating rail driving device for rotating the rotating rail in a predetermined relationship with the rotating state of the rotating table;
As the rotating rail rotates, the bag bottom cradle supports the bag bottom cradle in contact with and supports the bottom of the bag, and a lower position that is lowered from the raised position and separated from the bottom of the bag. An elevating device that moves up and down between positions, and maintains the bag bottom cradle in the raised position within a predetermined range of a rotation range in which the bag bottom cradle rotates together with the rotating rail ;
With
A groove extending in the circumferential direction is formed on the inner periphery of the rotating rail or the outer periphery of the supporting roller, and a member on the side of the rotating rail and the supporting roller where the groove is not formed fits in the groove. Accordingly, the rotary rail is supported by the support column, and the bag bottom receiving device in the rotary type bag filling and packaging machine. 2. The bag bottom receiving device according to claim 1, wherein a portion of the rotating rail and the support roller that fits into the groove of the member not formed with the groove is formed as a protrusion extending in a circumferential direction. A bag bottom receiving device in a rotary type bag filling and packaging machine. The rotary bag according to claim 2, wherein the protrusion is formed on an inner periphery of the rotating rail, and the groove is formed on an outer periphery of the support roller. Bag bottom receiving device for stuffing and packaging machines. The bag bottom cradle device according to any one of claims 1 to 3, wherein the elevating device is arranged extending along a circumferential direction of the rotating rail , and an upper surface thereof is a cam surface that is displaced vertically. A bag bottom cradle device in a rotary type bag filling and packaging machine, comprising: a lift cam, and a roller rotatably mounted on each of the cradle and contacting the cam surface. The bag bottom cradle device according to any one of claims 1 to 4, wherein the rotary rail drive device and the rotary table drive device are configured by the same drive device, and the rotary rail and the rotary table rotate the same. A bag bottom receiving device in a rotary type bag filling and packaging machine, characterized by rotating at a speed. 5. The bag bottom cradle device according to claim 1, wherein the rotating rail driving device is provided separately from the rotating table driving device, and the rotating rail is in a rotating state different from a rotating state of the rotating table. A bag bottom cradle device in a rotary type bag filling and packaging machine, wherein The bag bottom cradle device according to claim 6, wherein the rotating rail starts rotating at a speed slower than the rotating table, and then rotates at a speed exceeding the speed of the rotating table, and then decelerates again to rotate the rotating table. A bag bottom pedestal device in a rotary type bag filling and packaging machine, characterized in that the rotation is stopped after a slower speed than the table.

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