JP2007320635A - Sealer for packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly deaerate a packaging bag A while carrying the bag A between a pair of conveyer belts. <P>SOLUTION: While the starting ends of the pair of conveyer belts 31a and 31a are opened and an intake nozzle 60 is located to protrude between them, the packaging bag A is manually inserted through the pair of conveyer belts so that the intake nozzle enters an opening of the bag. By moving the bag A to the left, an optical sensor 70 detects the bag A, and the starting ends of a pair of belt pulleys close. At the same time, the inside of the packaging bag is deaerated by the intake nozzle 60. Thereafter, as soon as the intake nozzle retreats, the pair of conveyer belts and a conveyer 20a drive to move the packaging bag to the left. The packaging bag is transferred from the pair of belt pulleys and the conveyer to a pair of belt pulleys 32b and 32b and a conveyer 20b on the backside, sent to a trowel 50 by the travel of the pair of belt pulleys and the conveyer, sealed there, and sent out from the other end of the conveyer 20b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sealing device for a packaging bag that deaerates the inside of a packaging bag containing an article such as a product and seals its opening.

  This type of sealing device normally transports a sealed packaging bag in the lateral direction and seals the opening of the packaging bag in the middle of the transportation. An example of this sealing device is an embodiment of the present invention. Referring to FIGS. 1 and 2, a conveying conveyor 20 is provided on the apparatus frame 10, and a sealing machine 30 is provided on the upper part of the apparatus frame 10 so as to face the upper surface of the conveyor 20.

The sealing machine 30 has a pair of opposed conveyor belts 31 and 31 and a seal basket 50, and when the sheet is placed on the conveyor 20 with the opening a of the packaging bag A sandwiched between the pair of conveyor belts 31 and 31 ( 1 and 4), the conveyor 20 and the pair of conveyor belts 31 move in synchronization (move at the same conveying speed), and the packaging bag A is moved from one end to the other end by the conveyor 20 (from right to left in FIG. 1). And the opening a is sandwiched between the conveyor belts 31 and 31, and the opening a of the packaging bag A is sealed by the sealing bar 50 in the middle (Patent Document). 1 Paragraphs 0012 to 0014, FIG. 1 and FIG. 2 (see Patent Document 2 Paragraphs 0026 to 0029 FIG. 2 and FIG. 4).
JP-A-10-291511 JP 11-348933 A

In the sealing operation of the packaging bag A, the inside of the bag A may be degassed from the viewpoint of reducing the bulk of the bag. As a means for degassing, it is common to suck the inside of the bag A by an intake nozzle (see Paragraph 0008 in FIG. 1 to FIG. 6 and Patent Document 4 Paragraph 0014 in FIG. 1).
JP 7-187144 A JP 2004-345656 A

The conventional deaeration in this type of sealing device can be advanced and retracted as described in Patent Document 4 and as described in Patent Document 3 in which the intake nozzle faces the opening of the packaging bag A for intake. In some cases, the air intake nozzle is inserted into the opening of the packaging bag to inhale, and the latter is more efficient than the former. In addition, if the packaging bag is highly flexible, such as a resin film, it is flattened by the air intake. There is an advantage that even if it becomes, it can inhale smoothly.
However, since the deaeration means in the sealing device of Patent Document 3 is not configured to convey a packaging bag between a pair of conveyor belts, the deaeration means cannot be applied to the configuration as it is.

  This invention makes it a subject to apply the deaeration effect | action by the intake nozzle which can be advanced / retracted of the patent document 3 to the sealing device which conveys a packaging bag on a pair of conveyor belts.

In order to achieve the above object, according to the present invention, first, both start ends of the pair of conveyor belts can be opened and closed, and an intake nozzle can be projected and retracted between both start ends.
In this way, with both start ends of the pair of conveyor belts being opened, the intake nozzle is advanced between the both start ends, and the intake port of the intake nozzle enters the opening of the packaging bag. The part can be placed between the beginnings of the pair of conveyor belts. For this reason, if the opening part of the packaging bag containing the suction nozzle is located between the both ends of the pair of conveyor belts, the opening part of the packaging bag is sandwiched between the pair of conveyor belts if the both ends are closed. Blocked.

Next, in the present invention, in the state where the opening of the packaging bag is sandwiched and closed by the pair of conveyor belts, the inside of the packaging bag is deaerated by the intake of the intake nozzle, and after the deaeration is completed, the intake nozzle is It was made to withdraw from the opening of the packaging bag (pulling out) and proceed to the sealing process for the opening.
In this way, if the air is sucked while the opening portion of the packaging bag is sandwiched and closed by the pair of conveyor belts, the air flow is prevented from flowing into the opening portion due to the blockage, so that the air intake is smoothly performed. Done. Also, when pulling out the intake nozzle, the elasticity of the conveyor belt causes the intake nozzle to be pulled out to close the portion of the opening where the intake nozzle has entered, so the outside air flows into the packaging bag. Is also effectively prevented.

  Incidentally, since the conventional pair of conveyor belts is a belt, the present invention has a structure in which the opening of the packaging bag is sandwiched between them. In the same way, in the opening where the intake nozzle is inserted, the opening of the packaging bag is blocked by the pair of conveyor belts. It has both functions of bag transport. On the other hand, like the deaeration means described in Patent Document 3, the member that closes the opening of the packaging bag only has its closing action, and does not have another action such as a transport action. Absent. For this reason, the present invention is not merely applied to the apparatus for sealing the sandwiching bag opening between the conventional degassing means of Patent Document 3 with a pair of conveyor belts.

  In the present invention, as described above, the pair of conveyor belts are responsible for both the closure of the packaging bag opening and the conveyance of the packaging bag, so that the deaeration in the packaging bag and the sealing of the opening are continuously performed. And can be performed smoothly.

As an embodiment of the present invention, it comprises a conveyor for transporting a sealed packaging bag in the lateral direction and a sealing machine for sealing the packaging bag sent by the conveyor. The pair of conveyor belts are transported across the opening of the packaging bag, and both start ends thereof can be opened and closed. In the state where both ends of the pair of conveyor belts are open and the intake nozzle protrudes between them, the intake port of the intake nozzle enters the opening of the packaging bag (the packaging bag is set) After closing both ends of the pair of conveyor belts and sandwiching the opening of the packaging bag between the two, the intake air is sucked by the intake nozzle, the inside of the packaging bag is deaerated, and the intake nozzle is connected to the pair of conveyor belts. Is exited between the beginning of Beaberuto, then it is possible to adopt a configuration for driving in synchronization the conveyor belt of the conveyor pair.
At this time, the packaging bag may be set between the two start ends of the pair of conveyor belts manually or automatically.

  In this configuration, a sensor for detecting that the intake port of the intake nozzle has entered the opening of the packaging bag is provided, and the operation of closing both ends of the pair of conveyor belts and the subsequent operation are detected by the detection signal of the sensor. If the opening of the packaging bag is set between the two start ends of the pair of conveyor belts, the deaeration action and the sealing action can be automatically performed.

  As a means for opening and closing both ends of the pair of conveyor belts, the entire pair of conveyor belts may be contacted and separated, but the structure becomes large and leads to an increase in cost. For this reason, it is preferable that both ends of the pair of conveyor belts are fixed, and only the starting ends are moved to open both ends.

The means for opening and closing both start ends of the pair of conveyor belts can be performed by moving the belt pulleys at the start ends in the opening and closing directions, respectively. A well-known configuration such as attaching and moving a screw jack, a motor, or the like can be employed.
For example, a pair of conveyor belts can be run with both ends thereof being stretched over belt pulleys, and a pair of belt pulleys on the start side can be contacted and separated, and both start ends of a pair of conveyor belts The pair of belt pulley bearings on the start end side of the pair of conveyor belts are supported so as to be movable only in the contact and separation direction, and the shaft of the belt pulley is provided with a cam floor, The cam floor is slidable on the cam surface of the cam plate, and movement of the cam plate causes the bearings of the pair of belt pulleys to contact and separate through the cam floor to open and close both start ends of the pair of conveyor belts. A configuration can also be adopted.
The cam plate may be appropriately moved by a driving machine such as the air cylinder, and there are advantages that the opening and closing action of the both ends of the pair of conveyor belts by the cam structure by the cam plate is inexpensive and reliable.

In addition, when the belt pulley at the end of the pair of conveyor belts is fixed and the belt pulley at the start end is movable and the both start ends can be opened and closed, the intake nozzle is near the end side of the belt pulley at the start end Can be located.
In this way, if the intake nozzle is located near the beginning of the pair of conveyor belts to be opened and closed, the opening degree of the packaging bag is adjusted by appropriately adjusting the degree of opening thereof, so that the intake port of the intake nozzle enters therein. It can be smoothly inserted (set) between the two start ends of the pair of conveyor belts. If the position of the intake nozzle is separated from the beginning of the pair of conveyor belts, the opening / closing degree of the beginning must be increased in order to obtain a space (interval between the pair of conveyor belts) for smoothly setting the opening of the packaging bag. In addition, it is disadvantageous not only in terms of design but also in terms of cost, such as requiring space for that amount.

The conveyor belt and the pair of conveyor belts may have a single action of feeding from the intake nozzle to the seal rod, but are divided into a portion where the intake nozzle can be projected and retracted and another portion, respectively, The front pair of conveyor belts can be opened and closed at both ends, and an intake nozzle can be projected and retracted between the two ends. In a state where both start ends are open and the intake nozzle protrudes between them, the intake port of the intake nozzle enters into the opening of the packaging bag, closes both start ends of the former pair of split conveyor belts and opens the packaging bag Between the two ends of the former pair of split conveyor belts. , It can then be adapted to drive in synchronism with the divided conveyor belt with dividing conveyor and the latter pair split conveyor belt pairs in the former division conveyor.
In this way, there is an advantage that the deaeration process and the conventional sealing process become separate, and the conventional mechanism and control method of the sealing process can be used. At this time, both divided conveyors can be divided into one conveyor without being divided.

  Even if the rear end of the former pair of split conveyor belts and the start end of the latter pair of split conveyor belts are on the same axis in the lateral direction, the packaging bag can be delivered, but the axial direction of the belt pulley. In the state where the packaging bag opening is sandwiched between the rear ends of the former pair of split conveyor belts, the packaging bag opening is sandwiched between the starting ends of the latter pair of split conveyor belts. And the delivery is sure.

Also, the latter divided conveyor and the pair of divided conveyor belts are driven after the intake nozzles are retreated from both the start ends of the former divided conveyor belt and the pair of divided conveyor belts. However, it can always be driven synchronously.
Since the conventional conveyor, the pair of conveyor belts, and the seal rod are always driven and controlled for ease of control, the latter divided conveyor and the pair of divided conveyor belts are preferably made to do so. It is. Incidentally, since the insertion of the nozzle into the bag opening portion is in the front-rear direction, when the belt is moving, it is difficult to move the opening sideways by touching the belt, and it is dangerous if it is done manually.

  If the intake nozzle can be moved at the same speed in the direction of travel in synchronization with the pair of conveyor belts, if the packaging bag opening is set between the start ends of the pair of conveyor belts, the pair of conveyor belts travels. Since it can be driven, the workability is good. However, since the nozzle is inhaling while moving, a mechanism for moving the nozzle in the traveling direction is required, and a travel distance is required to ensure degassing. Connected.

  An embodiment is shown in FIGS. 1 to 5. In this embodiment, a conveying conveyor 20 is provided on the front surface of the apparatus frame 10, and a sealing machine 30 is provided on the upper portion of the apparatus frame 10 so as to face the upper surface of the conveyor 20. ing. The sealing machine 30 has a pair of opposed conveyor belts 31, 31, a seal rod 50 and an intake nozzle 60 along the conveyor 20.

  The conveyor 20 and the pair of conveyor belts 31 and 31 are divided into left and right parts, respectively, and the front conveyor 20a and the rear conveyor 20b, the front pair of conveyor belts 31a and 31a, and the rear pair of conveyor belts 31b. , 31b. The belts 21a and 21b of the conveyors 20a and 20b and the conveyor belts 31a, 31a, 31b and 31b are stretched over pulleys 22a, 22b, 32a and 32b, and the driving pulleys 22a (right side), 22b (left side), Sprockets 23 and 33 are provided on the shafts 32a (right side) and 32b (left side), respectively. The sprockets 23 and 33 are rotated by motors M1 and M2 via chains (chain belts) 24 and 34, and the conveyor belts 21a, 21b, 31a, 31a and 31b are connected to the sprockets 23 and 33 and pulleys 22a and 32a. , 31b travel at the same speed.

  The conveyor 20a and the conveyor belt 31a, and the conveyor 20b and the conveyor belt 31b are respectively driven by one motor M1 and M2, and the conveyor 20a and the conveyor belt 31a run at the same speed synchronously by driving one motor M1, By driving the other motor M2, the conveyor 20b and the conveyor belt 31b are always driven at the same speed in synchronization. Each conveyor 20a, 20b and conveyor belt 31a, 31b are individually driven by one motor to synchronize each motor, or all the conveyors 20a, 20b and conveyor belts 31a, 31b are driven by one motor. The respective conveyors 20a and the conveyor belts 31a or the conveyors 20b and the conveyor belts 31b can be selectively driven by turning the clutch on and off.

  The rear end (left side in FIGS. 1 and 2) of the former pair of split conveyor belts 31a and 31a and the start end (right side in FIGS. 1 and 2) of the latter pair of split conveyor belts 31b and 31b are belt pulleys 32a. , 32b are overlapped in the axial direction (front and back direction in FIG. 2) (see FIG. 3), and the packaging bag A opening a is sandwiched between the rear ends of the former pair of divided conveyor belts 31a and 31a, The packaging bag opening a is sandwiched between the starting ends of the latter pair of split conveyor belts 31b, 31b, and the packaging bag A is delivered reliably.

  As shown in FIG. 5, the bearing unit 40 at both starting ends of the pair of conveyor belts 31 a and 31 a on the front side has a pulley shaft 35 of the pair of belt pulleys 32 a and 32 a of the unit frame 41 via the front and rear bearings 35 a and 35 a. It is supported in the long hole 42 'so as to be movable in the vertical direction. A cam floor 42 is provided between both bearings 35a, 35a of the shaft 35 so as to be rotatable and immovable in the axial direction. A cam plate 43 is provided in the unit frame 41 so as to be movable in the left-right direction (FIG. 2). The cam plate 43 is advanced and retracted in the left-right direction by an air cylinder 44 (see FIGS. 1 and 2).

  A cam plate 45 is formed in the cam plate 43, and the cam floor 42 is fitted in the cam hole 45 so as to be movable in the length direction. The inner surface of the cam hole 45 becomes the cam surface 45a, and the cam plate 43 moves to the left and right, whereby the upper and lower cam floors 42 roll on the cam surface 45a and come in contact with each other. By this contact / separation, the pair of belt pulleys 32a, 32a is also contacted / separated. That is, both start ends of the front pair of conveyor belts 31a and 31a are opened and closed. This opening / closing degree is appropriately set in consideration of the ease of insertion of the packaging bag, the size of the opening / closing mechanism, and the like.

  The sprocket 33 (located in the middle of the belt pulleys 32a and 32a at both ends in FIG. 2) connected to the belt pulley 32a and the chain 34 on the start end side of the conveyor belts 31a and 31a is the bearing unit 40 in FIG. There is no cam plate 43 and cam floor 42, and the bearing 35a is supported by a bearing unit 40a (see FIG. 2) that cannot move up and down.

The intake nozzle 60 is positioned on the conveying direction in the vicinity of the end side of the belt pulley 32a at the start end of the conveyor belt 31a (see FIGS. 1 and 2). As shown in FIGS. 1 and 3, the intake nozzle 60 is moved back and forth (up and down direction in FIG. 3) by an air cylinder 61.
Further, a downward optical sensor 70 is installed in the middle of the belt pulleys 32a and 32a at both ends. When the optical sensor 70 detects the packaging bag A (solid line state in FIG. 3), the air cylinder 44 is driven. Then, the start ends of the pair of belt pulleys 32a and 32a are closed, and the entire length in the width direction of the packaging bag A is sandwiched and closed by the pair of conveyor belts 31a and 31a (see FIG. 6C). Instead of the optical sensor 70, a known device such as a photoelectric switch can be adopted.

  The sealing device of this embodiment is configured as described above. As shown in FIG. 6A, the front ends of the pair of conveyor belts 31a, 31a are opened, and the intake nozzle 60 (intake port 60a) protrudes therebetween. The packaging bag A made of a resin film is inserted between the pair of conveyor belts 31a and 31a by hand so that the intake port 60a of the intake nozzle 60 enters the opening a (see FIG. 3). 6 (b), when moved leftward as indicated by the one-dot chain line arrow (from the solid line state of FIG. 3 to the two-dot chain line state), the optical sensor 70 causes the packaging bag A to move. Upon detection, the start ends of the pair of belt pulleys 32a and 32a are closed (FIG. 6C).

At the same time, the air is sucked from the intake nozzle 60 and the inside of the packaging bag A is deaerated. This deaeration time is set appropriately so that sufficient and necessary deaeration is performed according to the size, contents, etc. of the packaging bag A, and when that time elapses, the intake nozzle 60 moves away. The pair of belt pulleys 32a and 32a and the front conveyor 20a are driven to move the packaging bag A to the left (FIG. 6D).
The packaging bag A is transferred from the pair of belt pulleys 32a and 32a and the conveyor 20a to the rear pair of belt pulleys 32b and 32b and the conveyor 20b, and the pair of belt pulleys 32b and 32b and the conveyor 20b. As the vehicle travels, it is fed into the seal rod 50, sealed, and fed out from the other end of the conveyor 20 (20b).

After the packaging bag A is transferred from the pair of belt pulleys 32a and 32a and the conveyor 20a to the pair of belt pulleys 32b and 32b and the conveyor 20b on the rear side, the front pair of conveyor belts 31a and 31a While being opened, it stops and the intake nozzle 60 protrudes and returns to the initial state (FIG. 6A). Thereafter, sealing with degassing of the packaging bag A is performed by the same action.
At this time, when the packaging bag opening a passes between each pair of belt pulleys 22a, 22b, 32a, 32b, the thickness of the opening a is absorbed by the elasticity (dent) of the belt to allow the passage. However, a known tension mechanism such as an elastic body (for example, a spring) that urges the pair of pulleys (only one is acceptable) slightly upward and downward and biases the pair of pulleys in contact with the pulley is provided. The thickness can be absorbed and an appropriate clamping force can be obtained.

  In this embodiment, the deaeration is performed in a state where the pair of belt pulleys 32a and 32a and the conveyor 20a are stopped. However, the intake nozzle 60 is synchronized with the pair of belt pulleys 32a and 32a to the left at the same speed. It is possible to move and inhale. At this time, the lengths, traveling speeds, and the like of the belt pulleys 32a and 32a are appropriately set so as to obtain a moving distance that allows sufficient and necessary degassing of the packaging bag A by intake air.

Further, the pair of conveyor belts 31, 31 and the conveyor 20 can be performed by one pair of the conveyor belts 31, 31 and the conveyor 20 without being divided (31a, 31b, 20a, 20b).
In this case, since the pair of conveyor belts 31 and 31 become long, a guide roller is provided in the middle (for example, provided at the end position of the conveyor belt 31a), and the start end side can be opened and closed from the guide roller. it can. Further, the conveyor belt 31 and the conveyor 20 can be stopped during deaeration, or can be always driven.

Furthermore, the opening and closing of the pair of conveyor belts 31, 31, 31a, 31a is not limited to the cam mechanism, and other well-known ones such as a configuration in which the bearing 35a is directly moved up and down by an air cylinder or the like can be used. .
Moreover, although the Example was a case where the packaging bag A was sideways (horizontal placement), even if it is the case where the packaging bag A is placed and moved on the conveyor 20 (see Patent Document 1), the present invention. Of course, can be adopted. At this time, the pair of conveyor belts 31 and 31 are opposed to each other, and the intake nozzle 60 moves up and down.

The principal part perspective view of one Example Outline front view of the same embodiment Main part plan view of the same embodiment Side view of the main part of the same example The principal part expansion perspective view of the Example Operational diagram of this embodiment Action diagram Action diagram Action diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Apparatus frame 20 Conveyor 20a Front conveyor 20b Rear conveyor 21a, 21b Conveyor belt 22a, 22b Belt pulley 30 Sealing machine 31 Pair of conveyor belts 31a Front pair of conveyor belts 31b Rear pair of conveyor belts 32a, 32b Belt pulley 35 Pulley shaft 35a Bearing 40, 40a Bearing unit 42 Cam floor 43 Cam plate 45a Cam surface 50 Sealing cage 60 Intake nozzle 60a Intake nozzle intake port 70 Sensor A Packaging bag a Packaging bag opening

Claims (7)

Consists of a conveyor (20) for conveying the sealed packaging bag (A) in the lateral direction and a sealing machine (30) for sealing the packaging bag (A) sent by the conveyor (20),
The sealing machine (30) includes a pair of opposing conveyor belts (31, 31), a seal rod (50) and an intake nozzle (60) along the conveyor (20), and the pair of conveyor belts (31, 31). 31) is carried while sandwiching the opening (a) of the packaging bag (A), and both start ends thereof can be opened and closed, and the intake nozzle (60) can be projected and retracted between the both start ends. And
In a state in which both start ends of the pair of conveyor belts (31, 31) are open and the intake nozzle (60) is located between them, the intake port (60a) of the intake nozzle (60) is a packaging bag (A). Into the opening (a) of the pair, the both ends of the pair of conveyor belts (31, 31) are closed, the packaging bag opening (a) is sandwiched between them, and the air is sucked in by the intake nozzle (60). The inside of the packaging bag (A) is degassed, and the suction nozzle (60) is withdrawn from between the both ends of the pair of conveyor belts (31, 31), and then the conveyor belt (31) and the pair of conveyor belts (31, 31). 31) is driven in synchronization with the packaging bag sealing device.   A sensor (70) for detecting that the intake port (60a) of the intake nozzle (60) has entered the opening (a) of the packaging bag (A) is provided, and the detection signal of the sensor (70) 2. The packaging bag sealing device according to claim 1, wherein the closing action of both starting ends of the pair of conveyor belts (31, 31) and the subsequent action are automatically performed.   The pair of conveyor belts (31, 31) has fixed belt pulleys (32a, 32b) at the end thereof, the belt pulley (32a) at the start end is movable, and both the start ends can be opened and closed. 3. The packaging bag sealing device according to claim 1, wherein the intake nozzle (60) is positioned in the vicinity of the end side of the belt pulley (32 a) at the start end. Both ends of the pair of conveyor belts (31, 31) are stretched over belt pulleys (32a, 32b), respectively, and the pair of conveyor belts (32a, 32a) on the start end side are allowed to run. It is possible to contact and separate, and both start ends of the pair of conveyor belts (31, 31) can be opened and closed,
The bearings (35a) of the pair of belt pulleys (32a, 32a) on the starting end side of the pair of conveyor belts (31, 31) are supported so as to be movable only in the contact / separation direction, and the belt pulley (32a) The shaft (35) is provided with a cam floor (42), and the cam floor (42) can slide on the cam surface (45a) of the cam plate (43). The bearings (35a, 35a) of the pair of belt pulleys (32a, 32a) are brought into contact with and separated from each other via the cam floor (42) to open and close both start ends of the pair of conveyor belts (31, 31). The sealing device of the packaging bag in any one of Claims 1 thru | or 3. The conveyor (20) and the pair of conveyor belts (31, 31) have a portion (20a, 31a, 31a) in which the intake nozzle (60) can be projected and retracted and another portion (20b, 31b, 31b). Each comprising a front and rear conveyor (20a, 20b) and a pair of front and rear conveyor belts (31a, 31a, 31b, 31b),
Both front ends of the pair of conveyor belts (31a, 31a) on the front side can be opened and closed, and the intake nozzle (60) can be projected and retracted between the both ends.
In a state where both start ends of the pair of divided conveyor belts (31a, 31a) are opened and the intake nozzle (60) is located therebetween, the intake port (60a) of the intake nozzle (60) is a packaging bag. After entering the opening (a) of (A), closing the both ends of the former pair of split conveyor belts (31a, 31a) and sandwiching the packaging bag opening (a) therebetween, the intake nozzle (60), the inside of the packaging bag (A) is evacuated, and the suction nozzle (60) is retracted from between the both ends of the former pair of divided conveyor belts (31a, 31a), and then the former pair The divided conveyor belts (31a, 31a) and the divided conveyor (20a) and the latter pair of divided conveyor belts (31b, 31b) and the divided conveyor (20b) are driven synchronously. Packaging bag sealing apparatus according to any one of claim 1 to 4.   The rear end of the former pair of split conveyor belts (31a, 31a) and the start end of the latter pair of split conveyor belts (31b, 31b) overlap in the axial direction of the belt pulley (32a, 32b), and In the state where the packaging bag opening (a) is sandwiched between the rear ends of the former pair of divided conveyor belts (31a, 31a), the packaging bag opening (a) is connected to the latter pair of divided conveyor belts (31b, 31a, 31a, 31a, 31a). The sealing device for a packaging bag according to claim 5, wherein the sealing device is sandwiched between the starting ends of 31b).   The latter split conveyor belt (20b) and the pair of split conveyor belts (31b, 31b) are always driven synchronously, and the former split conveyor belt (31a, 31a) and the split conveyor belt (20a). The packaging according to claim 5 or 6, wherein the intake nozzle (60) is driven in synchronism after retreating from between the start ends of the former pair of divided conveyor belts (31a, 31a). Bag sealing device.

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