Bag-filling packaging device and bag-filling packaging method

Abstract

To solve the problem that with a conventional bag filling and packaging device which includes a rotary filling and packaging machine having a first filling machine for high-speed filling of to-be-packaged objects and a second filling machine for subsequent low-speed filling, and has an auto-checker that is placed on the downstream of the filling machine and checks the weight of filled bags, errors in the actual filling volume by the auto-checker are inaccurate, for example the errors cannot be directly corrected in the second filling machine, and the cost is increased if a separate weighing device is installed to weigh the bags filled by the second filling machine.SOLUTION: A bag filling and packaging device of the present invention includes a rotary filling and packaging machine having a first filling machine 16, a weighing device 17 for weighing the bags after filling, a second filling machine 19 for further filling the bags after weighing. In the bag filling and packaging method, the bags filled by the second filling machine 19 are re-conveyed on a conveying path without being discharged from the conveying path of the rotary filling and packaging machine, weighed by the weighing device 17 of the rotary filling and packaging machine, and based on the weighing value, the filling state of the second filling machine 19 is corrected.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bagging packaging apparatus and a bagging packaging method for continuously filling and packaging items to be packaged. [Background technology]

[0002] Bag-filling packaging devices and methods for continuously filling and packaging powder or granular material into bags at predetermined weights are already widely known. In addition, it is also well known that in such bag-filling packaging devices and methods, an auger-type filling machine is used as a type of filling machine for filling the packaged material. This auger-type filling machine fills bags with the packaged material of the desired weight by pulse-controlling the output torque and rotation speed (number of revolutions) of a servo motor that rotates an auger (auger screw). In order to perform high-precision filling, a bag-filling packaging device is known that has two auger-type filling machines, one large and one small, and one weighing device disposed between the two auger-type filling machines, and this bag-filling packaging device performs feedback control to accurately fill the packaged material.

[0003] For example, Patent Document 1 discloses a bag filling and packaging device that includes two filling machines 51, 52, a first filling machine 51 that roughly fills a large volume of packaged material into a bag 50 and a second filling machine 52 that correctively fills a small volume of packaged material, and a weighing device (only the bag gripping part of the weighing device is shown in simplified form) 53 between the filling machines 51, 52. Then, after the first filling machine 51 roughly fills the bag 50 with the packaged material at high speed, the bag is weighed by the weighing device 53, and the bag 50 is correctively filled with the packaged material by the second filling machine 52 by the weight obtained by subtracting the weighing value of the weighing device 53 from the final target filling amount (calculated filling). The bag filling and packaging device of Patent Document 1 has an advantage that it can be done at a high speed, since the weighing-only section can concentrate on the weighing work of the bag 50 after the rough filling by the weighing device 53, as described below.

[0004] Incidentally, when auger filling is performed using pulse control, if the packaging and filling work is carried out continuously for a long period of time, the bulk density (mass / volume) of the packaged goods may fluctuate due to changes in humidity in the air, etc. Therefore, the tendency for the filling amount to fluctuate is judged based on the measurement value of the weighing device 53, and the rotation speed of the servo motor of the first filling machine 51 is feedback controlled so that the accurate amount of packaged goods is filled.

[0005] Furthermore, in Patent Document 1, an autochecker (not shown in Fig. 4) is installed downstream of the rotary packaging machine to measure the weight of the product after packaging is completed, making it possible to correct fluctuations in bulk density. In this case, the autochecker measures the weight of the product packed in a bag, calculates a correction amount for the corrected filling amount based on the measurement data from the autochecker every few times, and feedback controls the control unit of the second filling machine 52 with the trend pulse number corresponding to the correction amount, and repeats control so that the next filling is corrected and the changed amount is filled.

[0006] In the above-mentioned Patent Document 1, the control unit of the second filling machine 52 is feedback-controlled based on the measurement of the autochecker, but as a modified example of this Patent Document 1, there is a rotary-type packaging machine in which a second weighing device 55 is arranged instead of the autochecker, as in Patent Document 2. That is, as shown simply in FIG. 5, the second weighing device 55 is arranged in a process following the calculation and filling by the second filling machine 52 (a dripping nozzle in Patent Document 2) of the rotary-type packaging machine, and the bag 50 filled with the packaged material is transferred and measured by this second weighing device 55, and the control unit of the second filling machine 52 is feedback-controlled based on this measured value. That is, as described above, if the packaging and filling work is performed for a long period of time, the bulk specific gravity may vary, so the tendency of variation in the filling amount of the second filling machine 52 is judged based on the measurement value detected by the second weighing device 55, and the second filling machine 52 is feedback-controlled based on this tendency of variation to fill an accurate amount.

[0007] Unlike the above-mentioned Patent Documents 1 and 2, a simplified diagram of another bagging packaging device that is not affected by fluctuations in bulk density is shown in Fig. 6. Patent Document 3 discloses a weighing, filling and packaging method and device configured as described above. The bagging packaging device in Fig. 6 is a method in which, after a first filling machine 51 fills the packaged material, a second filling machine 52 transfers the contents to be packed and weighs them using a weighing device 56 (only the bag gripping portion is shown) (weighing and filling). That is, filling is performed while controlling the rotation of the auger of the second filling machine 52 based on the weighing value from the weighing device 56.

[0008] According to the bag filling packaging device of Fig. 6, since the bag is filled while being weighed, even if there is a change in the bulk density, the bag can be filled accurately without being affected by the change in the bulk density. Also, since the filling is not calculated as in Fig. 4 and Fig. 5, even if the first filling machine 51 has been filled with all the packaged goods as the filling work approaches the end, the second filling machine 52 can continue filling only, so that the first and second filling machines 51, 52 can be filled to the end without leaving any packaged goods behind.

[0009] 4 and 6, as shown in Fig. 7, after filling with first filling machine 51, weighing with weighing device (first weighing device) 53 and calculation by a control device or the like, and then further, filling while weighing with weighing device 56 (second weighing device: only the bag gripping part is shown) is considered (calculation filling + weighing filling). The bag filling packaging device in Fig. 7 has the same advantages as the bag filling packaging device in Fig. 6. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2008-239190 A [Patent Document 2] Utility Model Registration No. 3181414 [Patent Document 3] Japanese Patent Application Publication No. 11-314602 Summary of the Invention [Problem to be solved by the invention]

[0011] As described above, in the conventional bag filling packaging apparatus disclosed in Figure 4, the second filling machine 52 for supplying small volumes is feedback controlled based on the tendency of changes in the filling amount detected by an auto-checker located quite far from the second filling machine 52. Therefore, it is not possible to directly correct and control the second filling machine 52 for errors in the actual filling amount by the auto-checker, resulting in the problem that multiple products are produced that are underweight.

[0012] As a method for dealing with this, in Fig. 5, a second weighing device 55 is installed immediately after the filling process by the second filling device 52 in the rotary filling packaging machine, which prevents the production of multiple products that are underweight. However, in the case of the rotary filling packaging machine in Fig. 5, two weighing devices 53, 55 are required in the rotary filling packaging machine, which has the disadvantage of increasing the manufacturing costs of the machine.

[0013] 4 and 5, when the filling operation is completed, the supply of packaged materials such as powdered or granular materials to the hoppers of the first and second filling machines 51 and 52 is stopped, but after the stopping, many packaged materials are discharged from the hopper of the first filling machine 51, so the hopper of the first filling machine 51 is emptied first. Conversely, many powdered or granular materials remain in the hopper of the second filling machine 52, so there was a problem that the burden of cleaning up the remaining packaged materials was heavy for the workers.

[0014] In contrast, the rotary-type filling and packaging machine of Figures 6 and 7 is capable of weighing the packaged items without being affected by fluctuations in bulk density, as described above, and does not leave a large amount of powdered packaged items in the hopper of the second filling machine 52 at the end of the filling operation. However, in the rotary-type filling and packaging machine of Figures 6 and 7, the packaged items are weighed while being filled by the second filling machine 52, so that the packaged items are weighed while shaking as they fall, which causes problems such as a slow weighing speed and difficulty in pursuing weighing accuracy. Furthermore, the rotary-type filling and packaging machine of Figure 7 requires two weighing devices 53 and 56, which increases the cost of the equipment and is not practical.

[0015] In view of the above problems, the present invention has an object to provide a bagging packaging apparatus and a bagging packaging method that can improve filling accuracy while suppressing increases in manufacturing costs. [Means for solving the problem]

[0016] The bagging packaging apparatus of the present invention is a bagging packaging apparatus including a filling and packaging machine that continuously fills and packages a predetermined weight of packaged items into bags, and a control device, The filling and packaging machine has a conveying device that moves and conveys bags along a conveying path, a first filling machine that fills the bags being conveyed with a packaged item, a weighing device that is arranged downstream of the first filling machine on the conveying path and weighs the bags filled by the first filling machine, and a second filling machine that is arranged downstream of the weighing device on the conveying path and fills the bags filled by the first filling machine with a packaged item whose weight is calculated by subtracting the weighing value of the weighing device from a filling target value; The control device conveys the bags filled by the second filling device back to the conveying path of the filling and packaging machine without discharging them from the conveying path, and measures the amount of the bags by a weighing device of the filling and packaging machine. Weighed weight value The present invention is characterized by having a re-weighing correction function that judges and controls the filling state of the second filling machine based on the measured value.

[0017] In addition, the bag-packing method of the present invention includes a filling section where the bag is conveyed along a conveyance path and the bag is filled with an object to be packed by a first filling machine, a weighing section for weighing the filled bag, and a filling section for filling the bag filled by the first filling machine with a weight obtained by subtracting the measured value of the weighing device from the filling target value by a second filling machine. Using a filling and packaging machine having these sections, the bag-packing method continuously fills the bag with the object to be packed by a predetermined weight and packs it, The bag filled by the second filling machine is conveyed again along the conveyance path of the filling and packaging machine without being discharged from the conveyance path of the filling and packaging machine, and is weighed by the weighing device of the filling and packaging machine Weighed weight value Based on this, reweighing correction for correcting the filling state of the second filling machine is performed.

Effect of the Invention

[0018] According to the bag-packing device and the bag-packing method of the present invention, without increasing the number of weighing devices in the filling and packaging machine from one to two, the weight filled by the second filling machine can be measured. Then, based on the measured value, by correcting the filling state of the second filling machine, the influence of the fluctuation of the bulk specific gravity can be minimized, and the filling accuracy of the bag-packing device and the bag-packing method can be improved.

Brief Description of the Drawings

[0019] [Figure 1] Plan view schematically showing the bag-packing device of the present invention [Diagram 2] Diagram schematically showing the bag-packing method of the present invention [Diagram 3] Diagram schematically showing another bag-packing method of the present invention [Figure 4] Diagram schematically showing a conventional bag-packing method [Diagram 5] Diagram schematically showing another conventional bag-packing method [Figure 6] Diagram schematically showing still another conventional bag-packing method [Figure 7] Diagram schematically showing yet another conventional bag-packing method

Embodiments for Carrying Out the Invention

[0020] As shown simply in Figures 1 and 2, a bag filling packaging apparatus according to an embodiment of the present invention includes a rotary filling packaging machine 1 that continuously fills bags 5 with predetermined amounts of powder or granular material and packages them, an autochecker (weight inspection device) 2 that is disposed downstream of the rotary filling packaging machine 1 and measures the weight of the bags 5 filled and packaged by the rotary filling packaging machine 1, an output conveyor 3 that outputs (output direction Q) the bags 5 filled and packaged by the rotary filling packaging machine 1 to the autochecker 2 side, and a control device (not shown) that controls each of the components of the bag filling packaging apparatus including the rotary filling packaging machine 1. Note that the present invention is not limited to the rotary filling packaging machine 1, and may be a circulating packaging machine, for example, an elliptical packaging machine.

[0021] In the rotary-type filling and packaging machine 1, eight sets of clamp arms, each set of two with clamps attached to the tip for clamping both side edges of the bag 5, are axially supported on the periphery of a circular rotor 11. The driving force of a drive motor disposed below the circular rotor 11 is transmitted to the circular rotor 11, causing the circular rotor 11 to intermittently rotate clockwise (rotation direction R) at a pitch of 45°.

[0022] The sections of the circular rotor 11 include a bag supply section (1) in which empty bags 5 are supplied from a bag box 13 by a bag supply device 12, a bag opening section (2) in which a printing operation for printing expiration dates and the like on the bags 5 and an opening operation for the bags 5 are performed, a first filling section (3) having a large-capacity hopper 15 and in which the first filling machine 16 roughly fills the bags 5 with the packaged material at high speed (higher than the second filling machine 19 described later), and a weighing device 17 disposed downstream of the first filling section (3) for transferring the filled bags 5 to the first filling machine 16. The machine is provided with a weighing section (4) which weighs the bags 5 filled with the filling material, a second filling section (5) which is arranged downstream of the weighing section (4) and has a small-volume hopper 18 for filling a small volume of packaged goods at a low speed with high accuracy, a degassing section (6) which degasses the air in the bags 5 with a degassing device 20, a sealing section (7) which seals the mouths of the bags 5 with a sealing device 21, and a cooling and carrying-out section (8) which cools the sealed parts of the bags 5 with a seal cooling device 22 and carries the packaged bags 5 out of the conveying path of the circular rotor 11 to the carrying-out conveyor 3 side. The filling and packaging operations are carried out in sequence in these sections (1) to (8).

[0023] The basic filling and packaging operations performed in these sections (1) to (8) will be briefly explained below. First, the bag supplying device 12 arranged corresponding to the bag supplying section (1) supplies empty bags 5 stacked in a bag box 13 to the clamp arm of the circular rotor 11. That is, the bags 5 stacked in the bag box 13 are sucked one by one from the top by a suction cup and supplied to the clamp arm of the bag supplying section (1), and the bag 5 is hung by clamping both side edges of the bag 5. In addition, in the printing operation performed in the bag opening section (2), the printer 14 prints, for example, the expiration date and the date of manufacture on the surface of the bag 5 at appropriate positions, and in the bag opening operation, the suction cups suck the front and rear surfaces of the bag 5 to open the bag mouth, and four metal wires called spatulas hold the bag mouth open. The bag supplying device 12, bag box 13, printer 14, deaeration device 20, sealing device 21, seal cooling device 22, etc. are already known.

[0024] In the first filling section (3), a first filling machine 16 is disposed, which is composed of a filling auger equipped with a pulse-controlled servo motor, a large-capacity hopper 15, etc. The auger of this first filling machine 16 has a large diameter and fills the packaged material in a large volume at high speed, roughly filling the bag 5 with the packaged material such as powder or granular material at a smaller amount than the target filling amount (first filling step). In contrast, the auger of the second filling machine 19 in the subsequent second filling section (5) has a small diameter and adds and fills the packaged material at a relatively low speed with high precision.

[0025] A weighing device 17 such as a load cell is disposed in the weighing section (4). The weighing device 17 transfers the bag 5 filled with the packaged goods in the first filling section (3) to the bag gripper of the weighing device 17, weighs the bag 5, and outputs the weighed value to the control device (weighing process). The control device subtracts the weighed value of the weighing device 17 from the target filling value of the packaged goods to calculate the additional filling amount (calculated filling amount) in the second filling section (5). Since the bulk specific gravity (mass / volume) may vary when the packaging and filling operation is performed over a long period of time, the tendency of the filling amount to vary is determined based on the weighed value of the weighing device 17, and the first and second filling machines 16 and 19 for large-volume supply and small-volume supply are feedback-controlled based on this tendency of variation to adjust the filling amount to be filled accurately.

[0026] In the second filling section (5), a second filling machine 19 is disposed, which has a small-volume hopper 18 and fills small volumes of packaged goods at a low speed with high accuracy. In this second filling section (5), as described above, only the calculated filling amount obtained by subtracting the weighing value of the weighing device 17 from the filling target value is filled (second filling step). The second filling machine 19 also has a filling auger equipped with a pulse-controlled servo motor.

[0027] The second filling machine 19 is configured to be arranged in the second filling section (5) for filling when filling starts or during the filling operation, but as shown by the imaginary line in Fig. 1, when filling is completed, the second filling machine 19 can move to the measuring section (4) and fill using the second filling machine 19 while measuring using the measuring device 17 (the operation at this time will be described later). In this embodiment, the rotating shaft 19a supporting the second filling machine 19 is arranged on the outer periphery side of the intermediate part between the measuring section (4) and the second filling section (5), and the auger of the second filling machine 19 can be moved to a position above the measuring device 17 in the measuring section (4) by rotating the support arm 19b supporting the second filling machine 19 around the rotating shaft 19a (rotation direction T).

[0028] After the second filling machine 19 fills the bags 5 with the packaged items, the air inside the bags 5 is removed by a degassing device 20 in the degassing section (6), and the openings of the bags 5 are sealed by a sealing device 21 in the sealing section (7). In the cooling and carrying-out section (8), the sealed portions of the bags 5 are first cooled by a seal cooling device 22, after which the clamping action is released and the packaged products are placed on the carrying-out conveyor 3 from the conveying path of the circular rotor 11 and carried to the autochecker (weight inspection device) 2.

[0029] In the auto checker (weight inspection device) 2, the weight of the packaged bag 5 is measured and inspected. If the filled and packaged bag 5 is within a preset filling amount range, it is shipped as a non-defective product (product is discharged), but if it is not within the filling amount range, it is determined to be a defective product and is processed as such.

[0030] In the bag-filling packaging apparatus and bag-filling method of the present invention, as shown in FIG. 2, a weighing device 17 is disposed between a first filling machine 16 and a second filling machine 19, and the servo motors of the first filling machine 16 and the second filling machine 19 are pulse-controlled. Furthermore, the servo motor of the first filling machine 16 is caused to correct the number of pulses based on the measured value measured by the weighing device 17 immediately after filling by the control device. The feature of the present invention is that the bag 5 calculated and filled by the second filling machine 19 is recirculated to the conveying path without being discharged from the conveying path of the rotary filling and packaging machine 1, weighed by the weighing device 17 of the rotary filling and packaging machine 1, and a re-weighing correction operation is performed to determine the filling state of the second filling machine 19 based on the measured value and correct the number of pulses. The function of performing such a re-weighing correction operation is called a re-weighing correction function.

[0031] Then, at the start of the refilling operation (start-up), a start-up correction mode including a re-measurement correction operation is implemented, and thereafter, when the normal refilling operation is continued for a predetermined time or a predetermined amount of refilling operation is performed, a work correction mode including a re-measurement correction operation is implemented, and at the end of the refilling operation, a work end mode is implemented. However, this is not limited to this, and instead, the start-up correction mode, work correction mode, and work end mode may be selectively implemented (the control contents of each mode may be executed by an operation button or an operation panel, etc.), and the start-up correction mode, work correction mode, and work end mode may be executed by the operator, respectively. These modes will be described below.

[0032] [Start-of-work correction mode] In order to optimize the filling amount of the packaged items at the start of work (when the bagging and packaging device is started up), the pulse value of the servo motor of each of the augers of the first and second filling machines 16 and 19 is controlled by a control device. As a control method, first, before normal filling operation, based on the data from the previous filling, the first filling process by the first filling machine 16, the weighing process by the weighing device 17, and the second filling process by the second filling machine 19 are carried out multiple times (for example, about 3 to 5 bags) on a trial basis using test bags 5. Then, the measured values ​​by the weighing device 17 in the weighing process are averaged, and the pulse value of the first filling machine 16 is updated by correcting the error amount using this average value.

[0033] As shown in Fig. 2, in the cooling and conveying section (8), the filled bags 5 are not discharged from the conveying path of the rotary filling and packaging machine 1, but are recirculated along this conveying path. In other words, the filled bags 5 are passed through each section (bag supply section (1), bag opening section (2), first filling section (3)) without undergoing the bag supply operation, printing operation, bag opening operation, or first filling operation. Meanwhile, a second weighing is performed by the weighing device 17 in the weighing section (4), and the pulse value of the second filling machine 19 is corrected using this weighing value (re-weighing correction operation is performed at the start of work). This correction makes it possible to correct errors due to fluctuations in bulk specific gravity for the second filling machine 19.

[0034] [Work correction mode] During the filling and packaging work, the basic filling operation is carried out as a rule. That is, feedback control to the first filling machine 16 is carried out by the weighing operation of the weighing device 17, and the second filling machine 19 performs only calculation filling of the weight obtained by subtracting the weighing value of the weighing device 17 from the target filling value.

[0035] If a predetermined condition is satisfied during this operation, the control device executes a re-weighing correction operation as shown in FIG. 2. The condition for executing the re-weighing correction operation is set to be performed after filling by the rotary filling and packaging machine 1 has been performed a predetermined number of times (e.g., several thousand or tens of thousands of times) or after filling has been performed for a predetermined time (e.g., several hours). If this condition is satisfied, the re-weighing correction operation is automatically performed as in the start-of-work correction mode. That is, if the above-mentioned execution condition is satisfied, after the first filling operation, the weighing operation, and the second filling operation are performed a predetermined number of times (e.g., about 3 to 5 bags), the pulse value of the first filling machine 16 is corrected and updated by the amount of error. Furthermore, the bags 5 are not discharged from the conveying path of the rotary filling and packaging machine 1, but are recirculated along this conveying path. At that time, the filled bags 5 are weighed a second time by the weighing device 17 in the weighing section (4) without carrying out the bag supplying operation, printing operation, bag opening operation, and first filling operation, and the pulse value of the second filler 19 is corrected with this weighing value (re-weighing correction operation during filling work).This makes it possible to correct errors due to fluctuations in bulk specific gravity not only in the first filler 16 but also in the second filler 19, thereby improving filling accuracy.

[0036] [Auto checker operation correction mode] During the filling operation, the conditions for executing the re-weighing correction function may be, instead of the number of fillings or the filling time as described above, the re-weighing correction operation may be executed only when the filling weight tends to fluctuate as shown in FIG. 3 by the autochecker 2 provided downstream of the rotary-type filling and packaging machine 1 (re-weighing correction operation by the autochecker during the filling operation). In other words, if the working environment such as temperature and humidity does not fluctuate significantly, there is often no need to execute the re-weighing correction operation because there is little fluctuation in the bulk density during the operation. Therefore, the re-weighing correction operation may be executed only when the filling amount tends to fluctuate and it is necessary to execute the re-weighing correction operation as shown in FIG. 3. If the filling amount does not tend to fluctuate, a signal to stop recirculation is issued. The operation unit may be configured so that the re-weighing correction operation can be executed or stopped manually from a panel for executing or stopping the re-weighing correction operation.

[0037] [Work completion mode] 4 and 5, when the filling operation is completed, after the supply of powdered or granular material to the hoppers of the first and second filling machines 16 and 19 is stopped, the hopper of the first filling machine 16 empties first, and conversely, a large amount of powdered or granular material to be packaged remains in the hopper of the second filling machine 19. Therefore, the second filling machine 19 is structured to be movable between the position of the second filling section (5) and the position of the weighing section (4) where the powdered or granular material is weighed by the weighing device 17, and while powdered or granular material remains in the hopper of the first filling machine 16, the second filling machine 19 is placed in the weighing section (4), and the filling operation is continued until the hopper of the first filling machine 16 is emptied.

[0038] When the hopper of the first filling machine 16 becomes empty, the second filling machine 19 moves to the weighing section (4) in response to a command signal from the control device, and fills the packaged items using the second filling machine 19 while weighing using the weighing device 17. This method can minimize the amount of powder remaining in the second filling machine 19 at the end of the operation. As described above, it is preferable to install and control a rotation drive motor so that the support arm 19b of the second filling machine 19 automatically rotates when switching to the operation end mode, but instead of rotating automatically, it may be configured to stop temporarily and rotate the support arm 19b manually.

[0039] In the above embodiment, the second filling machine 19 is moved from the second filling section (5) to the weighing section (4) only when the work is nearing completion, but this is not limited to this. When the amount of packaged items is small from the beginning, the first filling machine 16 may not be used, and the packaged items may be filled by the second filling machine 19 while being weighed by the weighing device 17 in the weighing section (4). [Industrial Applicability]

[0040] INDUSTRIAL APPLICABILITY The present invention is useful in various bagging packaging apparatuses and bagging methods that have a filling and packaging machine and continuously fill and package items to be packaged. [Explanation of symbols]

[0041] 1 Rotary type filling and packaging machine 2 Auto checker (weight inspection device) 3. Discharge conveyor 5 bags 11 Circular rotor (transport device) 12 Bag feeding device 14 Printing device 15 Large capacity hopper 16 First filling machine 17 Weighing device 18 Small Capacity Hopper 19 Second filling machine 20 Deaeration device 21 Sealing device 22 Seal cooling device

Claims

1. A bagging and packaging device including a filling and packaging machine that continuously fills and packages a bag with a predetermined weight of packaged items, and a control device, The filling and packaging machine has a conveying device that moves and conveys bags along a conveying path, a first filling machine that fills the bags being conveyed with a packaged item, a weighing device that is arranged downstream of the first filling machine on the conveying path and weighs the bags filled by the first filling machine, and a second filling machine that is arranged downstream of the weighing device on the conveying path and fills the bags filled by the first filling machine with a packaged item whose weight is obtained by subtracting the weighing value of the weighing device from a filling target value, The control device is characterized in that it has a re-weighing correction function that controls the bag filling packaging device to transport the bag filled by the second filling machine back to the transport path without discharging it from the transport path of the filling packaging machine, and to judge and correct the filling status of the second filling machine based on the measurement value measured by the weighing device of the filling packaging machine.

2. The bag filling packaging device described in claim 1, characterized in that, when performing the re-weighing correction function, the control device transports the bag filled by the second filling machine along the conveying path without sealing it with the sealing device, and passes the bag along the conveying path without performing the bag supplying operation by the bag supplying device and the filling operation by the first filling machine, and controls the filled bag to be weighed by the weighing device.

3. 3. A bag filling packaging device as claimed in claim 1 or 2, characterized in that the control device has a start-up correction mode in which a re-weighing correction function is performed at the start of filling work, and an operation correction mode in which the re-weighing correction function is performed when a predetermined condition is satisfied during filling work, or has either one of these modes.

4. a second filling machine is arranged movably between a second filling section position where only filling is performed but not metering, and a metering section position where metering is performed by a metering device; The bag filling packaging apparatus according to any one of claims 1 to 3, characterized in that, when a second filling machine is arranged in the weighing section, filling is performed by the second filling machine while measuring by the weighing device.

5. An auto-checker is provided to measure and inspect the filling weight of the bags discharged from the conveying path of the filling and packaging machine. The bag filling packaging device according to any one of claims 1 to 4, further comprising an auto-checker operation correction mode for determining whether or not to carry out a re-weighing correction operation based on a result of judging a fluctuation trend in the filling amount based on the measurement value of the auto-checker.

6. A bag packaging method for continuously filling and packaging a predetermined weight of a packaged item into bags using a filling and packaging machine having a filling section in which bags are conveyed along a conveying path and a first filling machine fills the bags with a packaged item, a weighing section in which the filled bags are weighed, and a filling section in which a second filling machine fills the bags filled by the first filling machine with a weight obtained by subtracting a weighing value of a weighing device from a filling target value, comprising: A bag filling and packaging method characterized in that the bag filled by the second filling machine is transported again along the transport path without being discharged from the transport path of the filling and packaging machine, and a re-weighing correction is performed to correct the filling state of the second filling machine based on the measured value measured by a weighing device of the filling and packaging machine.

7. The bag filling packaging method described in claim 6, characterized in that when performing re-weighing correction, the bags filled by the second filling machine are transported along the conveying path without being sealed by the sealing device, and are passed through the conveying path without being subjected to the bag supplying operation by the bag supplying device and the filling operation by the first filling machine, and the filled bags are weighed by a weighing device in the weighing section.

8. 8. The bagging packaging method according to claim 6, further comprising the step of: performing a re-weighing correction operation at the start of filling and / or during the filling operation.

9. The second filling machine is movable between a second filling section position where filling is only performed and no metering is performed, and a metering section position where metering is performed by a metering device, A bag-filling packaging method according to any one of claims 6 to 8, characterized in that, when a second filling machine is arranged in the weighing section, filling is carried out by the second filling machine while measuring by a weighing device in the weighing section.

10. A bag filling packaging method according to any one of claims 6 to 9, characterized in that the filling weight of a bag discharged from the conveying path of the filling packaging machine is measured by an autochecker, and a decision is made as to whether or not to carry out a re-weighing correction operation based on the result of judging the trend of fluctuations in the filling amount based on this measurement value.

11. A bag filling packaging method according to any one of claims 6 to 10, characterized in that a first filling machine has a large-capacity hopper and roughly fills the material to be packaged into a bag at high speed with the material to be packaged, and then a second filling machine, which is arranged downstream of the first filling machine and has a small-capacity hopper, fills a small volume of the material to be packaged accurately at a low speed.

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