JPS6031692B2 - Packaging bag opening tension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging bag opening tensioning device, and more particularly, the present invention relates to a packaging bag opening tensioning device, and more specifically, a device for pulling the opening of a packaging bag in the width direction as a step before sealing the opening of a packaging bag after filling the contents with a sealing machine. The present invention relates to a device for introducing the swell into a sealing loom while removing the bulge.

Conventionally, in automatic packaging machines, packaging bags after filling with contents are
It was simply held by its upper part and introduced into the loom.

However, as is well known, the packaging bag after being filled with contents swells significantly in its thickness direction. Therefore, the opening part for filling the contents, that is, the mouth part, also swells so that the opposing walls are most separated at the center in the width direction, and as a result, it is difficult to simply seal the opening part of the packaging bag in such a state. If the upper part is just covered and it is introduced into the sealing loom as it is, the opening will be sewn and sealed, or the opening will be folded back and sealed by adhesive. Wrinkles or bends may occur in the woven portion, resulting in poor sealing or a decrease in the strength of the sealed portion. Therefore, an object of the present invention is to make the opening of the packaging bag wide enough so that the opposing walls touch each other, in order to remove the bulge at the opening of the packaging bag that is transported toward the sealing machine after filling the contents. An object of the present invention is to provide a packaging bag opening tensioning device that introduces the packaging bag into a sealing loom while pulling it in the direction of the packaging bag.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the packaging bag opening tensioning device of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

1 to 4 show an embodiment of the packaging bag opening tensioning device of the present invention.

This packaging bag opening tensioning device 10 includes two rails 11a and 11b made of round bars arranged parallel to each other with an increased interval,
The truck 12 is disposed between the rails and is movable along the rails. This trolley 12 consists of a tubular frame main body 13 with a rectangular cross section, and flanges 14a, 14b extending vertically at spaced intervals in the longitudinal direction of the tubular frame main body 13 are provided on both sides of the upper and bottom parts of the frame main body 13, respectively. 14c, 14d, 14e, 14f
is formed integrally with the tubular frame body 13.

On the outside of each of these flange portions 14a to 14f, rollers or wheels 15a to 15f are rotatably supported by shafts fixedly attached to the flange portions. Then, the upper and lower rollers on each side of the trolley 12 sandwich each rail 11a, 11b in the vertical direction, and thereby,
The trolley 12 runs on a rail. In order to further ensure stable running of the bogie 12 on the rail, that is, to prevent the bogie 12 from coming off the rail, the upper two rollers 15a and 15c on one inner side of these rollers have flanges on both sides. It is a grooved roller, and the other rollers have smooth circumferential surfaces. Next, a support plate member 16 is disposed at one end of the truck 12 (the left end in FIG. 1), separate from the truck 12 and spaced apart from the truck 12.

This support plate member 16 has an inverted L-shape in longitudinal section, and a box-shaped bearing portion 17 is fixed to its upper surface. On the other hand, two rods 18 and 19 extend from the one end of the truck 12, and one of the rods 18
is slidably inserted into the common opening 20 of the bearing portion 17. In order to prevent the trolley 12 and the support plate member 16 from being separated by more than a predetermined distance, the rod 18 is provided at the end face with a spacer on the right side of the trolley 12 as viewed in FIG. In order to move the support plate member 16 along with the movement in the direction, the disk 2 has an outer diameter larger than the inner diameter of the customs clearance port 20 of the bearing part 17.
1 is attached as a stopper plate with bolts. Further, a coil spring 22 is disposed between the end surface of the truck 12 and the opposite end surface of the bearing portion 17 so as to surround the rod 18, and this spring 22 connects the support plate member 16 and the truck 12 to each other. It gives an acting force that tries to separate them. That is, when the force that compresses the coil spring 22 and causes the truck 12 to approach the support plate member 16 is released, the coil spring 2
Due to the repulsive force of 2, the trolley 12 and the support plate member 16 are relatively separated and maintained at a constant distance. Further, an L-shaped bracket 23 is also fixed to the side wall of the bearing part 17 with bolts, and one bent plate part 24 of the bracket 23 is arranged to stand up vertically from the side wall of the bearing part 17. .

That is, it protrudes laterally from the side wall. As shown in FIG. 3, a U-shaped notch 25 is formed in the plate piece 24 of the bracket 23 from the lateral direction. A circular flanged bearing 26 having a through hole in the center is installed in the notch 25 of the plate piece 24 so that the peripheral edge of the notch fits into the groove formed by the flanges on both sides. The other rod 19 extending from the aforementioned truck 12 is slidably inserted into the central through hole of the bearing 26 . In this way, the support plate member 16 is supported by the two rods 18 and 19 extending from the truck 12 so as to be able to move toward and away from the truck 12.

In addition, since the support plate member 16 is supported by the trolley 12, 2
The reason why two rods 18 and 19 are arranged is that the support plate member 16 is relatively heavy as will be described later, and also to prevent the support plate member 16 from swinging. Therefore, in principle, a plurality of such rods are required, but as long as the rod has a rectangular cross section or a rod with a circular cross section with a spline groove, it has cantilever support strength and torsional strength. It may be one rod. Next, a holding device 28 for holding the opening of the packaging bag is attached to a skirt portion 27 that is integrally formed with a portion forming the upper surface of the support plate portion 16. There is.
This clamping device 28 has gears 29a and 29 on the side, respectively.
The rotating members 30a, 30b include a pair of rotating members 30a, 30b having fixed gears 29a, 29b.
b are rotatably supported by the skirt portion 27 so as to be engaged with each other. Each of the rotating members 30a and 30b has a finger-like portion 31a extending outward in the direction from the peripheral surface thereof.
, 31b, and a holding piece 3 is provided on the opposite side of the finger-like part.
2a and 32b are attached with bolts or the like. Finger-shaped portions 31a integrally formed on the rotating members 30a and 30b
, 31b and a clamping piece 32a bolted thereto,
32b, etc., and the positional relationship is such that, as shown in FIG. 3, when the rotating members 30a and 30b are in the predetermined positions, the opposing surfaces of the holding pieces 32a and 32b are in close contact with each other in a state of close contact. Designed to get you. Further, a hydraulic motor 33 is attached to the inside of the skirt portion 27, and its rotating shaft passes through the skirt portion 27 and extends outward, and a gear 29b fixed to the rotating member 30b is also attached to the end of the hydraulic motor 33. A meshing small gear 34 is attached.

As a result, due to the operation of this hydraulic motor 33, the small gear 34
The rotation is transmitted to the rotating members 30a and 30b via the rotating members 30a and 30b. As a result, each rotating member 30a, 30b rotates in the opposite direction, so that
2a and 32b will open and close. Such a clamping device 28 is also provided on a plate member 36 fixed to the end wall 35 of the tubular frame body 13 with bolts or the like at the other end of the truck 12 (the right end in FIG. 1). .
The structure of the holding device provided at the other end of the trolley 12 is exactly the same as the above-mentioned holding device 28, but in order to distinguish between the two, the same reference numerals are given the same reference numerals with a dash. It is shown as follows. Furthermore, the packaging bag opening tensioning device 10 is mounted on a cart 1 as shown in FIGS. 1 and 3.
The bracket 37 is fixed to a shaft that rotatably supports the rollers 15a, 15c at the top of one side of the carriage 12, and extends along the carriage 12. Via the cylinder device 3
9 piston rods 401 are connected.

This air cylinder device 39 will be better understood from the operation of the present device 10 described later, but its position will be briefly explained here. It is placed and fixed in place on the support member. The air cylinder device 39 serves as a power source used only to return the carriage 12 from the end position of the loom on the side of the loom to the start position shown in FIG. Therefore, the carriage 12 is moved in the direction of the loom by a drive device which is another power source. This drive device 41 includes a chain 42 arranged on the upper part of the truck 12 along the rails 11a and 11b. This chain 42 is connected to two sprockets 43 (
(only one sprocket is shown in FIG. 1), each end 44a of this chain 42,
44b is a screw thread 4 formed with threads formed in opposite directions.
5a and 45b. This one screw 45
a is fixed to the end wall 35 at the end of the truck 12 with bolts or the like, and extends upward through a hole formed in the upper part of the mounting flange 46.
It is fixed to this mounting flange 46 by two nuts 47a, 47b screwed onto the threaded fins 45a on both sides.

These two threaded rods 45a and 45b are screwed into a tightening screw or turnbuckle 48 made of the longest nut, so that the slack of the chain 42 can be adjusted. In addition, the trolley 1 on which this device 101 can be moved
At the start position of No. 2 (Fig. 1), an end support plate 49 attached to a separate support member nearby is disposed on one end side, that is, on the left end side as seen in Fig. 1. There is.

As shown in FIG. 2, this end support plate 49 has a U-shaped cutout in the lower green part, and the support plate member 16 supported by the truck 12 passes through this cutout part 50. The box-shaped bearing portion 17 and the like pass through. However, a bolt 52 is screwed into one of the slope portions 51a and 51b on both sides of the notch portion 50 from the outside, and the tip of the bolt 52 is connected to the skirt portion 27 of the support plate member 16 as shown in FIG. We will support you. That is, this bolt 52
acts as a stop for this support plate member 16. This end support plate 49 also has both side plate portions 51a.
, 51b, the end portions of the rails 11a, 11b are inserted through and supported.

Then, a plate 5 is fitted so as to fit into a notch groove formed in the upper part of the rail to stop the rotation of the rails 11a and 11b.
3a and 53b are bolted to the end support plate 49. The operation of the packaging bag opening tensioning device 10 constructed in this manner is illustrated in FIG.
Referring to the figures and FIG. 6, the device 10 is mounted on top of a conveyor device C, which is preferably arranged between a filling machine A and a binding machine B.

Then, the cart 12 of the present device 10 is placed on standby at a position above the introduction end of the conveyor device C, which is close to the content filling machine A. This standby position is the starting position of the trolley 12,
The state at this time is shown in FIG. Next, the packaging bag D filled with the contents filling machine A is transferred to the introduction end of the conveyor device C by the plunger of the extrusion device E.

At this time, the opening of the packaging bag D passes between the open clamping pieces 32a and 32b and between 32a' and 32b' of the holding devices 28 and 28' of the present apparatus, and It is positioned so that the vicinity of both ends in the width direction is located between the holding pieces. In this state, the hydraulic motors 33, 33' of the clamping devices 28, 28' are operated to operate the clamping pieces 32a, 32b.
Then, 32a' and 32b' are closed, and the vicinity of both ends in the width direction at the opening of the packaging bag D is pressed as shown in FIG. Thereafter, the drive sprocket for the chain and the transfer conveyor device are operated synchronously, and the truck 12 is moved to the rail 11.
a, 11b begins to run.

However, at the starting position of the device 10, the support plate member 16 is prevented from moving toward the filling machine A side by the stopper bolt 52, but the carriage 12 is moved against the spring 22 by the air cylinder device 39, and the end face of the carriage 12 is prevented from moving toward the filling machine A side. and the skirt member 27 are brought close to each other to the extent that they come into contact with each other (this point will be described further later). Therefore, even if the carriage 12 starts to move in the direction of the loom B from this state, the support plate member 16 will not immediately move due to the repulsive force of the spring 22. Therefore, trolley 12
One clamping device 28' fixed to the support plate member 16 and the clamping device 28 attached to the support plate member 16 are relatively separated,
Therefore, the holder pieces 32a, 32 of the holder devices 28, 28'
The opening of the packaging bag D, which is held between b and 32 and 32b', is pulled in opposite directions at both ends. As a result, the mouth, which had been swollen due to filling with the contents, is stretched in the width direction and made flat. Next, as the truck 12 moves, the rod 18 extending from the end of the truck 12 engages the bearing portion 17 and is pulled out, and as shown in FIG. When the support plate member 16 comes into contact with the end face of the support plate member 16, the truck 12 moves along with the support plate member 16.

At this point, the two clamping devices 28, 28' are no longer separated, and the packaging bag D is transported toward the sealing machine B in cooperation with the conveyor device C while keeping the opening of the packaging bag in a tensioned state. do. In this way, when the cart 12 of the present device 10 approaches the sealing machine B, the packaging bags D with their openings stretched are introduced into the pair of V-belt devices extending from the sealing machine B so as to overlap. As a result, the opening of the packaging bag held flat is sandwiched between the pair of V-belts, and the delivery is completed.

At the same time, the hydraulic motor 33 of each clamping device 28, 28'
, 33' rotate in the opposite direction, and the ball holding pieces 32a, 32b and 3
2a' and 32b' are opened to release the seal at the opening of the packaging bag. Then, the chain drive is stopped, its drive source is freed, and the share cylinder device 39 is activated to quickly return the truck 12 to its original starting position.

When the truck 12 is returned to the starting position together with the support plate member 16, the situation shown in FIG. will be stopped. However, the preset piston stroke of the air cylinder device 39 continues to push the truck 12 toward the starting position. As a result, while only the truck 12 compresses the spring 22 and the rods 18 and 19 slide on the bearing portion 17 and the flanged bearing 26, as shown in FIG. move closer. The stroke of the air cylinder device 39 is set so that the return travel of the truck 12 is stopped when the vehicle approaches within a certain range. As can be understood from the above, since the stroke of the air cylinder device 39 is set in advance, by adjusting the position of the stopper port 52 that comes into contact with the skirt portion 27 of the support plate portion 16, the bogie at the starting position can be adjusted. 12 and the support plate member 16 are adjusted.

This means that the two holder devices 28, 2
The distance at the starting position of 8' is adjusted,
Therefore, the amount of tension at the opening of the packaging bag changes. Also, in FIG. 7, another embodiment of the packaging bag opening tensioning device of the present invention is schematically shown generally at 55.

The difference between the packaging bag opening tensioning device 55 in this embodiment and the device 10 shown in FIG.
8' is not fixedly attached to the carriage 12, but this clamping device 28' is also slidably supported by a rod 19' extending from the carriage 12, like one of the holding devices 28. . The support structure thereof is the same as the support structure of the clamping device 28 for the carriage 12 in the embodiment shown in FIG. However, the chain 42 that drives the truck 12 and the piston rods of the air cylinder device 39 during return travel are not directly attached to the truck 12, but are instead attached to the vertical flange 56 extending from the support plate member 16' of the clamping device 28'. is connected to.

As a result, at the starting position of the device 55, the clamping device 2
The skirt part 27' of the carriage 12 compresses the spring 22' disposed between the bearing part 17' and the end face of the carriage 12, and the spring 22' is applied to the end flange of the carriage 12, thereby causing the carriage 12 to further compress the spring 22'. It is compressed and pushed toward the side of the filling machine A, that is, the side of the holding device 28, and similarly comes into contact with the skirt portion 27 of the holding device 28, so that these three parts 12, 28, 28' are all in close contact with each other. Positioned. Next, the two-way support devices 28, 28
′ clamps the opening of the packaging bag, the holding device 28 ′ is pulled in the running direction by the tensile force of the chain 42 , whereby both the holding devices 28 , 28 ′ are separated together from the trolley 12 , and as a result, The gap between the clamping devices 28, 28' widens and the opening of the packaging bag is pulled outward in the width direction.

According to the packaging bag opening tensioning device 50 according to this embodiment, the carriage 12 supports the two clamping devices 28 and 28' slidably relative to the carriage 12, so that the clamping device 28 , 28' can be set to a very large length, so that the opening of the packaging bag, which is relatively inflated to a large extent, is pulled and flattened very effectively.

As described above, according to the packaging bag opening tensioning device of the present invention, while the packaging bag whose opening is swollen after being filled with contents is introduced into the sealing loom, both ends of the opening in the width direction are pulled. This allows the bag to be introduced into the sealing machine with its mouth flattened (to the extent that both walls of the bag are in contact with each other). There are no wrinkles or bends in the sealed portion, so there is no possibility of poor sealing or a decrease in the strength of the sealed portion.

[Brief explanation of drawings]

FIG. 1 is a front view showing the packaging bag opening tensioning device of the present invention in its starting position, FIG. 2 is a left side view of the packaging bag opening tensioning device of FIG. 1, and FIG. FIG. 2 is a side view showing the device with the end support plate removed; FIG. 4 is a top view of the device shown in FIG. 1; and FIG. FIG. 6 is a partial front view showing the state in which the device is running independently from the current position, FIG. It is a front view which shows the packaging bag opening tensioning device of another Example. 10...Packaging bag opening tension device, 11a, 11b
...Rail, 12...Dolly, 16...
... Support plate member, 17... Bearing part, 18...
...Rod, 22...Spring, 28, 28'...
...Autumn holding device, B...Sealing loom, C...Conveyor device, D...Packaging bag. Figure 6 Figure 1 Figure 4 Figure 2 Figure 3 Figure 5 Figure 7

Claims (1)

[Claims] 1. Packaging bag opening tensioning, in which the opening of the packaging bag is pulled in the width direction after being filled with contents while being conveyed toward the sealing machine to remove bulges at the opening, and the bag is then introduced into the sealing machine. The device includes a rail disposed along the device for conveying the packaging bag to the sealing machine, a trolley mounted on the rail and movable along the rail, and a trolley supported by the trolley for transporting the packaging bag. two clamping devices that respectively clamp one end and the other end of the mouth in the width direction, at least one of which is supported so as to be slidable in the moving direction of the cart; and one of the gripping devices that is slidable. a spring member provided to press one clamping device away from the other clamping device to maintain a constant distance between the two clamping devices; a stopper that pushes back the one gripping device that is slidable at the start position against the spring member to shorten the distance between the two gripping devices; and a power device that returns the cart to its original position after moving the cart a certain distance. and a packaging bag opening tensioning device.