JPH0840420A - Method for opening bag and table-rotating apparatus for bagging and packing - Google Patents

Abstract

PURPOSE:To reliably open a bag having a folded part at the bottom and avoid the inability in identifying whether a bag can be opened even if a machine speed varies by opening in two stages a pair of suction disks sucked to both faces of a lower part of the bag for expanding the bag. CONSTITUTION:Films on both upper faces and lower upper faces of a bag 1 having a folded part interposed by a fastener 2 are sucked by respective pairs of suction disks 3, 4, a lever 5 is inserted into the bag 1 while the suction disks are retreated, and air is blown for expanding the bag 1. At that time, opening of the lower suction disk 4 is such that it is opened to a distance S1 shorter than a regulated distance first, stopped once at this position, and then opened to the regulated value S. Time required for the lower suction disk 4 to open by the distance S1 is set so that it is equal to time required since the lower suction disk 4 is sucked until a vacuum pressure in a vacuum duct is stabilized, the opening by S1 is sensed to output a synchronous signal and also sense the vacuum pressure, and whether the bag has been opened is identified based on both the sensing signal and the synchronous signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag opening method for a bag body having a folded portion at the bottom and having high rigidity and making it difficult to open the bag, and a table rotary type bag filling and packaging machine to which the method is applied.

[0002]

2. Description of the Related Art When a bag having an opening at the top and a folding portion at the bottom is opened before loading the filling material, a film on both upper and lower surfaces of the bag having both upper side edges clamped by a chuck is used. Adsorption is performed by a pair of suction cups, and then the suction cups are retracted to blow air into the bag body to expand the bag body.
Further, in JP-A-4-339730, a male body and a female body are sandwiched at both lower edge portions of the bag body and bent into a U-shape, thereby correcting the curvature of the bag body and holding it in a vertical state, The suction cup is designed so that it can be securely attached to the film on both lower surfaces of the bag.

However, since the bag body as described above has a high rigidity at the bottom and a large opening resistance, the suction cup adsorbed to the lower part of the bag comes off from the film during the expanding operation, and the bag bottom is not sufficiently opened. After the bag opening process is completed, the bag body may be sent to the next filling step and then the sealing step, and the bag body in which the bag bottom is not sufficiently opened overflows the filling material, This caused insufficient quantity and poor sealing.

On the other hand, in Japanese Utility Model Laid-Open No. 5-81005,
An intermittent rotary table having a plurality of chucks for gripping a bag body, and a table rotary type bag filling and packaging machine in which devices for performing a bag opening process, a filling process, a sealing process, and the like are arranged around the table, respectively, in the bag opening process, A vacuum sensor is installed in the vacuum line between the suction cup and the vacuum pump, the success or failure of bag opening is identified based on the detection signal from this vacuum sensor, and the result is used to control the packaging operation after the next process. Has been done. In other words, when the vacuum sensor detects that the vacuum degree of the vacuum line is maintained during the opening operation of the suction cup, it is determined that the bag opening has been successfully performed by this, and the next step and subsequent steps are performed for this bag. If you continue the normal packaging operation (filling of the filling and sealing of the mouth) with the vacuum sensor and detect that the vacuum level of the vacuum pipeline has dropped during the opening operation,
As a result, it was identified that the bag did not come loose from the bag surface during the opening of the suction cup, and the bag was not loosened. And reuse.

In addition, such a table rotary type bag filling and packaging machine is provided with a synchronizing signal generating means, which outputs a synchronizing signal at an appropriate timing when the suction cup is opened and opens based on both the synchronizing signal and the vacuum sensor. The success or failure of the bag is identified. Specifically, as shown in (a) and (c) of FIG.
Simultaneously with the stop of the table, the operation signal of the electromagnetic switching valve that is interposed between the air cylinder that moves the suction cup toward and away from the bag and the air compressor turns on, turns off after a predetermined period of time, and then synchronizes after t1. The signal is set to "ON" and to "OFF" after a lapse of a predetermined time.The suction cup moves forward with the operation signal "ON" of the electromagnetic switching valve and sticks to the bag body, and retracts with "OFF". Open the bag body. Then, when the vacuum sensor detects a decrease in the degree of vacuum while the synchronization signal is being output, it is determined that the bag opening has not been successful.

In actual operation, the time t1 from when the electromagnetic switching valve is turned "OFF" until when the synchronization signal is turned "ON", the degree of vacuum in the vacuum pipe line is stable after the suction cup is adsorbed by the bag body. It is set so as to substantially match the time t (determined in advance depending on the capacity of the vacuum pump 38, the length of the pipeline, etc.).
In other words, there is a time of t0 + t1 (t0 margin) after the suction cup is adsorbed on the bag until the synchronization signal becomes "ON", and the degree of vacuum in the vacuum pipeline is stable before the synchronization signal becomes "ON". Then
It will be ready for detection by the vacuum sensor. Note that the stable degree of vacuum means that the degree of vacuum is at least higher than the degree of vacuum checked by the vacuum sensor.

By the way, in the conventional table-rotating bag-filling packaging machine, the timing of "ON" and "OFF" of the operation signal and the synchronizing signal of the electromagnetic switching valve for the air cylinder is during one cycle of rotation and stop of the table. Since it is set based on the rotation angle of the rotating shaft that makes one rotation (see the numbers in FIG. 6),
For example, when shortening the time of one cycle (increasing the machine speed), the rotation speed of the rotary shaft is increased and both t0 and t1 are shortened. On the other hand, since t is constant, when the machine speed increases, finally t> t0 + t1 and the synchronization signal becomes “ON” before the degree of vacuum in the vacuum pipeline becomes stable. At this time, if the vacuum sensor detects a low degree of vacuum that does not fully rise, it is identified that the bag opening was not successful even though the suction cup was not actually removed. The reliability is reduced or the state becomes unidentifiable. In that case, the setting of t1 is changed (the rotation angle is made large) so that the degree of vacuum is stable within the time of t0 + t1 at the machine speed, but this is actually a very troublesome work. .

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. The bag body having a folding portion at the bottom is surely opened to overflow the filling material and the quantity is insufficient. In addition, it is not necessary to reconfigure the output timing of the synchronization signal relating to the identification of the success or failure of bag opening even if the machine speed changes, and it is highly reliable in identification and becomes indistinguishable. The purpose of the present invention is to obtain a bag-filling packaging device that does not have any problems.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a bag having an opening at the upper end and a folding portion at the bottom is sandwiched by chucks above both side edges of the bag to form films on both upper and lower surfaces of the bag. In the bag opening method of adsorbing with each pair of suction cups and expanding the bag body by blowing air into the bag body while retracting the suction cups, the pair of suction cups adsorbed on both lower surfaces of the bag body is specified. A first opening operation for opening a space S1 narrower than the space,
It is characterized in that a stop at that position and a second opening operation for opening to a specified interval S are subsequently performed, and preferably,
When the air is blown into the bag body, the blowing means is inserted into the upper end opening portion of the bag body to close the opening portion.

Further, instead of the above-mentioned opening operation, a pair of suction cups sucked on both lower surfaces of the bag body are opened at a space S1 narrower than the specified space, followed by a slower speed than the first opening motion. A second opening operation for opening up to the specified interval S may be performed. Here, the second opening operation for opening from the interval S1 to S is
Intervals S1 and S
Even if the speed changes in the middle of,
It may follow another predetermined speed-time program, but in any case, it is set so that the average speed when opening from S1 to S is slower than the speed when opening to S1.

Further, according to the present invention, the time required for the first opening operation of the lower suction cup is substantially equal to the time from the suction of the lower suction cup to the bag body until the vacuum pressure acting on the lower suction cup becomes stable. Then, the end of the first opening operation of the suction cup is detected, a synchronizing signal is output, and the vacuum pressure acting on the lower suction cup is detected by the vacuum sensor. Based on both the detection signal from the vacuum sensor and the synchronizing signal, the bag body The feature is that the success or failure of opening the bag is identified.

The present invention also relates to a packaging machine suitable for carrying out the above method, in which a pair of films on both upper and lower surfaces of the bag body, in which both side edges are clamped by chucks, are provided at the bag opening position. In the table rotary bag filling and packaging machine equipped with the bag opening means adapted to suck the air with the suction cup and blow the air into the bag body while retracting the suction cup to expand both lower sides of the bag body. The pair of suction cups is provided with a drive means for performing a first opening operation for opening at a space S1 narrower than a specified space, a stop at that position, and a second opening operation for opening up to the specified space S, further, A vacuum sensor for detecting a vacuum pressure acting on the suction cup in a vacuum line between the suction cup and the vacuum pump; a synchronization signal generating means for detecting a completion of the first opening operation of the suction cup and outputting a synchronization signal; Of the detection signal and sync signal from the sensor It is characterized by comprising a control device for identifying the success or failure of bag opening based on both of them and controlling the subsequent bag packing process. It should be noted that, instead of the driving means, a first opening operation in which the pair of suction cups for expanding both lower surfaces of the bag body are opened at an interval narrower than a specified interval, and then a specified interval at a slower speed than the first opening operation is performed. Drive means for performing the second opening operation for opening up to may be provided.

[0013]

In the bag opening method of the bag body, the pair of suction cups sucked on both lower surfaces of the bag body perform the first and second opening operations, so that the suction cups open at a stretch as compared with the conventional method. The movement of the suction cup is softened in a particularly large resistance range (S1 to). When the suction cup temporarily stops after the first opening operation, sufficient air is blown into the bag body even while the suction cup is stopped, and the suction cup comes off from the bag body during the second opening operation. Hateful. In addition, the first opening operation is followed by the first
Even when the opening speed is set to the specified interval S at a slower speed than the opening operation of No. 2, sufficient air is blown into the bag body at the time of the second opening operation, and the opening speed is slow, so that the suction cup does not easily come off from the bag body. When the suction cup is temporarily stopped after the first opening operation, the speed of the second opening operation cannot be slowed down because of the stop time, but the second opening operation is continued after the first opening operation. When the opening operation is performed, the opening speed of the entire opening can be slowed by taking no stop time. Then, when air is blown into the bag body, if the upper end opening of the bag body is closed by the blowing means, the internal pressure in the bag body rises, the expansion of the bag body is assisted, and the sucker does not come off. The bag opening process is performed more reliably.

In the above method, preferably, the output timing of the synchronizing signal is not set based on the rotation angle of the rotating shaft that makes one rotation during one rotation-stop cycle of the table, but rather the first opening of the suction cup. Detects the end of operation and outputs it. Therefore, for example, by adjusting the piston speed of the air cylinder that drives the suction cup, the time from the start to the end of the first opening operation of the suction cup is the If the initial setting is made to be almost the same as the time until the degree of vacuum stabilizes, even if the machine speed is increased, the time required for the first opening operation of the suction cup does not change, so the synchronization signal must always be in the vacuum pipeline. After the degree of vacuum becomes stable, it becomes “on”, and the reliability of identification does not deteriorate or become unidentifiable as in the conventional case. The details of the timing setting and operation in the present invention will be described in the following embodiments.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. The table intermittent rotation type bag filling and packaging machine according to the present embodiment (see FIG. 1) holds a bag body 1 having an opening at the upper end and a folding portion at the bottom to rotate intermittently on a table T.
And each apparatus arranged around the table T to perform each step (I to VIII) as a main configuration, and in the bag feeding step (I), a chuck on the table T side from the bag storage device A by a gripping device (not shown). The bag body 1 transferred to 2 is intermittently rotated together with the table T, is forwarded to the marking step (II), and the manufacturing date is imprinted on the surface thereof by the marking device B.
In the bag opening process (III), the bag 1 is expanded, and in the packing feeding process (IV), the solid packing passes through the hopper C to form the bag 1.
It is charged into the tank and is filled with tank D in the liquid filling step (V).
The filling liquid in the bag 1 is filled into the bag 1 and the mouth sealing step (V
In I and VII), the mouth of the bag body 1 is sealed by the sealing device E, and finally the bag body 1 completed in the discharging step (VIII) is discharged to the outside.

At the bag opening position (the position where the bag opening step (III) is performed) of the bag filling and packaging machine, as shown in FIG.
An upper suction cup 3 for adsorbing on both upper sides of the bag body 1 sandwiched by the chuck 2 above both side edges thereof, a lower suction cup 4 for adsorbing on both lower side surfaces thereof, and an air blowing punch 5 (above the air at the center of the bag body 1). (With a passageway 6). Reference numeral 7 is a female body having the same structure and operation as described in JP-A-4-339730, and 8 is a male body, which are positioned so as to sandwich the lower suction cup 4 and move forward and backward at the same time.

In FIG. 2, A is an explanatory view of the upper suction cup 3 viewed from above, B is an explanatory view of the entire side view, and C is an explanatory view of the lower suction cup 4 viewed from above. , The operation of the lower suction cup 4 and the blowing punch 5 (a) ~
It shows in order in (e). (A) is when the bag body 1 is stopped at the bag opening position, the upper suction cup 3 and the lower suction cup 4 are at the side standby position, and the blowing punch 5 is at the upper standby position. (B) shows the case where the upper and lower suction cups 3 and 4 are advanced and adsorbed to the films on both upper and lower surfaces of the bag body 1.
At this time, at the same time, the female body 7 and the male body 8 advance to sandwich the lower edges of the bag body 1 and bend the bag body 1 in a U-shape to correct the curvature of the bag body 1 and hold it in a vertical state.

In (c), when the upper suction cup 3 is opened, the chuck 2 is moved inward, and the blowing punch 5 is inserted into the opening of the expanded bag 1 to close it, and air is blown into the bag 1. , The lower suction cup 4 is opened for the distance S1 by performing the first opening operation. (D) is a case where air is blown into the bag body 1 from the blowing punch 5 and the lower suction cup 4 is opened to the distance S by performing the second opening operation. (E) shows a state in which the expansion of the bag body 1 is completed, the blowing punch 5 is raised, and the lower suction cups 4 are also separated from both surfaces of the bag body 1.

FIG. 3 shows the lower suction cup 4 and its driving means. The driving means 10 includes a frame 12 attached to a column 11 (see FIG. 4 or 5) and a cylinder having a rear end attached to the frame 12. 13 and an oscillating body 1 connected to the tip of the piston rod 14 via an angle adjusting piece 15.
6 and a shaft 17 that rotates according to the swing of the swing body 16.
A rocking plate 19 fixed to the shaft 17 and having pins 18 attached to both ends, a pair of rods 20 having one end rotatably attached to the pins 18, and rotatably attached to the other ends of the respective rods 20. Pin 21, a pair of slide members 22 fixed to the upper ends of the pins 21, a guide rail 23 extending along the frame 12 for slidably guiding the slide members 22 so that they can move toward and away from each other, and each slide. The lower suction cup 4 is provided horizontally at the upper end of the member 22 and the female body 7 is provided at both ends.
Alternatively, a bar 24 or the like to which the male body 8 is attached is provided. In addition, 2
Reference numeral 5 is a vacuum suction port connected to the lower suction cup 4, which is connected to a vacuum pump (see FIG. 1) via a vacuum pipe line (not shown), and 26 is a bolt for adjusting the position of the angle adjusting piece 15.

The air inlet and outlet of the cylinder 13 are connected to an air pipe and an air compressor 32 via electromagnetic switching valves 30 and 31. Incidentally, 33 is a synchronizing signal generating means, and 34 is a control panel. The cylinder 13 is a dual type air cylinder, and the position of the piston rod 14 can be set at three positions in a stepwise manner.

The cylinder 13 is operated as follows.
That is, when both the electromagnetic switching valves 30 and 31 are turned "on", air enters the chamber on the rear side of the first-stage cylinder 13a, the piston rod 14 moves forward, and the rear side of the second-stage cylinder 13b moves. Air enters the chamber and the piston rod 35 moves forward (position shown by the solid line in FIG. 3). Next, when the electromagnetic switching valve 30 is turned off, air enters the chamber on the front side of the first stage cylinder 13a and the piston rod 14 retracts.
The piston is stopped at the tip of the piston rod 35 on the way,
The retreat distance is L1. Then, turn off the electromagnetic switching valve 31.
Then, air enters the chamber on the front side of the second-stage cylinder 13b and the piston rod 35 retreats a distance L2, and at the same time the piston rod 14 also retreats, and the total retreat distance of the piston rod 14 at this time becomes L1 + L2.

At the most advanced position of the piston rod 14 (the position shown by the solid line in FIG. 3), the pair of slide members 22 are closest to each other, and the lower suction cup 4 is attracted to both lower surfaces of the bag body 1, so that the female body 7 and The male body 8 sandwiches both lower edges of the bag body 1 and bends it into a U-shape. When the piston rod 14 retreats a distance L1 from that, the shaft 17 rotates by an angle θ1 and the lower suction cup 4 opens a distance S1. Subsequently, when the piston rod 14 retreats a further distance L2, the shaft 17 rotates.
Further rotates an angle θ2, and the lower suction cup opens a distance S.

FIG. 4 is a plan view of FIG. 3, in which the lower suction cup 4 adsorbs to both lower surfaces of the bag body 1, and the female body 7 and the male body 8 sandwich the lower both edges of the bag body 1 to form a U shape. Shows the folded state,
FIG. 5 is a side view showing a state in which the upper suction cup 3 is sucked on both upper surfaces of the bag body 1 held by the chuck 2 attached to the table T and the lower suction cup 4 is sucked on both lower surfaces.

6 (a) and 6 (b), the electromagnetic switching valve 30,
The operation timing of 31, etc. is shown. Solenoid switching valve 30, 31
The timing of "ON" and "OFF" of the table T
Is set based on the rotation angle of the rotating shaft that makes one rotation during one rotation-stop cycle of the control panel 3 based on the setting.
It operates by receiving the signal from 4. Both electromagnetic switching valves 30, 31
Becomes "ON" at the same time as the table T stops, then the electromagnetic switching valve 30 becomes "OFF" after a lapse of a predetermined time (rotation angle), and the piston rod 14 retracts L1 (that is, the lower suction cup 4 opens S1). At this time, a synchronization signal is output (the sensor 14a is installed in the vicinity of the cylinder 13a, and the sensor 14a detects the backward movement of the piston to output the synchronization signal). Then, the electromagnetic switching valve 31
Is "OFF", and the piston 14 moves backward by L2 as the piston 35 moves backward by the distance L2 (that is, the lower suction cup 4 moves to S
open).

Further, FIG. 1 shows a vacuum sensor 36, an electromagnetic switching valve 37, and a vacuum pump 38 which are installed in the middle of a vacuum pipe line connected to the lower suction cup 4. The operation timing of the electromagnetic switching valve 37 is set based on the rotation angle of the rotating shaft that makes one rotation during one rotation-stop cycle of the table T, like the electromagnetic switching valves 30 and 31 (for example, the timing at which the table T stops). Then, the control panel 33 receives a signal based on the setting and operates.

The sync signal from the sync signal generating means 33 and the signal from the vacuum sensor are input to the control panel 34 and used to identify the success or failure of the expansion of the bag 1 as in the conventional case, and the identification result is used to control the subsequent steps. To be done. That is, the synchronization signal generating means 33
When the vacuum sensor 36 detects a decrease in the degree of vacuum and the signal is input to the control panel 34 while the synchronization signal from is ON,
The suction plate 4 is separated from the surface of the bag body 1 and it is identified that the bag has not been opened successfully, and the bag body 1 is discharged to the outside of the apparatus in the discharging step without performing a normal packaging operation in the subsequent steps. And reuse. On the other hand, when the vacuum sensor 36 does not detect a decrease in the degree of vacuum, it is determined that the bag has been opened successfully, and the bag 1 is subjected to the normal packaging operation in the subsequent steps.

By the way, in this embodiment, the electromagnetic switching valve 30 is used.
The time t2 from when the "off" signal is generated until the piston 14 retracts by the distance L1 is predetermined until the degree of vacuum in the vacuum pipeline stabilizes (the capacity of the vacuum pump 38, the length of the pipeline, etc.). The speed of the piston 14 of the air cylinder 13 is adjusted in advance so as to substantially match With this, the time from when the lower suction cup 4 is adsorbed to the bag body 1 until the synchronizing signal becomes “ON” is t0 (the electromagnetic switching valve 30 “OFF” signal is generated after the lower suction cup 4 is adsorbed to the bag body 1). Time) + t2, and this time is always larger than t2 no matter how high the machine speed is, so the vacuum pressure in the vacuum pipeline is always stable at the timing when the sync signal is "ON" ( When the machine speed is increased, the electromagnetic switching valve 30 is controlled based on the rotation angle of the rotating shaft that makes one rotation during one cycle of rotation / stop of the table T, so t0 is shortened, but t2 remains unchanged. ). Therefore, even if the machine speed is increased, it is not necessary to reset the timing of "ON" of the synchronization signal, and the reliability of the success or failure of opening the bag does not decrease or cannot be identified.

In the above embodiment, the lower suction cup 4 was stopped after the distance S1 was opened, and then the piston rod 14 was driven so as to be opened to the distance S. However, as shown in FIG. It is also possible to drive the piston rod 14 so that the suction cup 4 opens the distance S1 and then continues to open to the distance S at a slower speed. In that case, the piston rod 14
When L1 moves backward, it is detected by the sensor 14a, and based on the detection signal, the electromagnetic switching valve 31 is controlled to be "OFF", and the backward speed of the piston rod 35 of the cylinder 13b is controlled. The speed of the second opening operation of the lower suction cup 4 is slowed down.

In the above embodiment, the dual cylinder is used as the drive means for the suction cup, but if the actuator is an actuator whose drive speed can be freely set and whose absolute position can be detected, for example, an air servo. It goes without saying that other driving means such as a cylinder or a servo motor can be used. In that case, for example, as shown in FIG. 7 (b), the opening operation of the suction cup when opening from S1 to S is started to be very loose and the speed is increased in the middle, or as shown in (c), it is very loose at the beginning. The speed can be gradually increased, or an arbitrary speed can be set in the second opening operation.

[0030]

According to the present invention, it is possible to surely open the bag having the folded portion at the bottom to prevent overflow of the filling material, lack of the quantity, defective sealing and the like, and machine speed. Even if the value changes, it is not necessary to reset the output timing of the synchronizing signal for identifying whether the bag has been opened or closed, and the bag filling and packaging apparatus can be highly reliable in identification.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a table-rotating bag-filling packaging machine according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of a suction cup, an air blowing punch, and the like in the bag opening process.

FIG. 3 is a perspective view illustrating driving means for a lower suction cup.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view of FIG. 3;

FIG. 6 is an operation timing chart of the table rotary type bag filling and packaging machine according to the embodiment.

FIG. 7 is a diagram showing another example of the operation of the lower suction cup.

[Explanation of symbols]

 1 bag body 2 chuck 4 lower suction cup 5 air blowing punch 13 air cylinder 13a that drives the lower suction cup 13a first stage air cylinder 13b second stage air cylinder 14 first stage air cylinder piston rod 30, 31 solenoid switching valve 32 Air Compressor 33 Synchronous Signal Generating Means 34 Control Panel 35 Piston Rod of Second Stage Air Cylinder 36 Vacuum Sensor 38 Vacuum Pump

Claims (6)

[Claims] 1. A zipper holds both upper side edges of a bag having an opening at the upper end and a folding part at the bottom, and sucks films on both upper and lower surfaces of the bag with a pair of suction cups, respectively. In a bag opening method in which air is blown into the bag to expand the bag while retracting the sucker, a pair of suction cups adsorbed on both lower surfaces of the bag open at intervals S1 narrower than the specified interval. 1. A bag opening method of a bag body, which is characterized in that the opening operation 1), the stop operation at that position, and the second opening operation for opening to a specified interval S are subsequently performed. 2. A pair of suction cups attached to both lower surfaces of the bag,
The first opening operation for opening the space S1 narrower than the specified space, and the second opening for opening the space S at a slower speed than the first opening motion.
The bag opening method according to claim 1, wherein the bag opening operation is performed. 3. When the air is blown into the bag, a blowing means is inserted into the upper end opening of the bag to close the opening, and the opening of the bag according to claim 1 or 2. Method. 4. The time required for the first opening operation of the lower suction cup is made substantially equal to the time from when the lower suction cup is adsorbed by the bag body until the vacuum pressure acting on the lower suction cup becomes stable. The completion of the first opening operation is detected, a synchronizing signal is output, and the vacuum pressure acting on the lower suction cup is detected by a vacuum sensor. Based on both the detection signal and the synchronizing signal from the vacuum sensor, the success or failure of bag opening. The bag-disassembling method according to any one of claims 1 to 3, wherein: 5. At the opening position of the bag body, a pair of suction cups respectively adsorb the films on both upper and lower surfaces of the bag body having both side edge portions sandwiched by chucks, and air is sucked into the bag body while retracting the suction cups. In a table intermittent rotation type bag filling and packaging machine having a bag opening means adapted to expand the bag body,
The pair of suction cups for expanding both lower surfaces of the bag body perform a first opening operation for opening at a space S1 narrower than the specified space, a stop at that position, and then a second opening operation for opening up to the specified space S. A vacuum sensor for detecting a vacuum pressure acting on the suction cup in a vacuum line between the suction cup and the vacuum pump, and a synchronization signal for detecting the end of the first opening operation of the suction cup. It is characterized by comprising a synchronizing signal generating means for outputting and a control device for identifying the success or failure of bag opening based on both the detection signal and the synchronizing signal from the vacuum sensor and controlling the subsequent bag filling and packaging process. Table rotation type bagging and packaging machine. 6. In place of the driving means, the pair of suction cups for expanding both lower surfaces of the bag body have a spacing S1 narrower than a prescribed spacing.
6. The driving device according to claim 5, further comprising drive means for performing a first opening operation of opening the first opening operation and a second opening operation of opening the first opening operation to a specified interval S at a slower speed than the first opening operation. Table rotation type bagging and packaging machine.