JPH0790614B2 - Welding device for facing edges of sheet material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the case where, when molding products such as flexible containers used for the mass transportation of minerals and food powders, the opposite edges of sheet materials as raw materials are heated and welded to each other. The present invention relates to a welding device used in.

[0002]

2. Description of the Related Art A flexible container usually has a cylindrical body and a disk-shaped ceiling and a bottom that close the upper and lower openings of the body. These are flexible sheet materials. It is configured.

In the above structure, conventionally, there is one in which each opening edge of the body portion and the peripheral edges of the ceiling portion and the bottom portion are overlapped with each other and heat-welded.

In the case of molding the flexible container, for example, the work for welding the body and the ceiling is performed as follows.

That is, the body portion and the ceiling portion are arranged on the left and right of a heater such as a high-frequency welder, and the opening edge of the body portion to be welded and the peripheral edge of the ceiling portion are opposed to each other, and are vertically arranged. Overlaid.

Next, the overlapping portion is sandwiched by the heater from above and below, and the portion is welded.
Next, after pulling the heater up and down from the welded portion, the welded portion is moved forward, and both unwelded opposing edges are overlapped at a position corresponding to the heater, and then the above operation is repeated. The body and the ceiling are welded together.

[0007]

By the way, since the flexible container, which is an example of a product, has a large shape and is heavy, in the welding work of the body portion and the ceiling portion, conventionally, workers are arranged before and after the heater. By the cooperation work of these two, the overlapping of both facing edges and the sending of these to the front after welding are manually performed . As this, the welding operation described above, the operator more necessary and, since the object is heavy, the molding operation of the above product has become cumbersome.

[0008]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned circumstances, and the number of operations for welding the facing edges of a plurality of sheet materials, which are the materials of a product, is small and can be easily performed by a worker. The purpose is to be able to.

[0009]

The features of the present invention for achieving the above object are as follows.

That is, the welding devices are opposed to each other in the left-right direction.
Superposition portion where the left and right opposite edges of the sheet material stacked together vertically to, in a case provided with a heater to allow welded across the top and bottom, parts of the right and left sides of the upper SL overlapping portions
Towards the position, provided the pair of first chuck hand which reciprocates in the back-and-forth direction, the respective first chuck hand was moved forward to the site of each side of said overlapping portion is a portion of the sheet material to enable backward by sandwiching, the second chuck hand to allow clamping the portion of the same sheet material between backward and right and left first chuck hand provided to sandwich a portion of the sheet material, the second chuck the hand was freely lateral position adjustment
In point.

[0011]

[Operation] The operation of the above configuration is as follows.

In the "action" section, the terms in the following parentheses correspond to the terms in the claims.

The welding apparatus 1 heats the body (sheet material) 2 and the ceiling portion (sheet material) 3 so that the left and right opposing edges 2a, 3a of the body 2 are vertically overlapped and sandwiched from above and below to enable welding. in the case of providing a vessel 9, towards the site of the left and right sides of the upper SL overlapping portions, left to reciprocate back and forth direction
The provided first chuck hand 26 of the right pair, forward the above first chuck hand 26 and 26 above body portion to a portion of each side of said overlapping part (sheet) 2 and the ceiling ( A part of the sheet material 3 (2b, 3b) is sandwiched so that it can be moved back.

Therefore, when the opposing edges 2a, 3a of the body portion (sheet material) 2 and the ceiling portion (sheet material) 3 are welded together, first, the opposing edges 2a, 3a superposed on each other.
Are sandwiched by the heater 9 and welded (shown by phantom lines in FIG. 6).

Next, towards the site of the body part (sheet) 2 and the ceiling section (sheet material) each side of the overlapping portion of the opposite edge 2a, 3a of 3, that is, each of the welding portions 38 side of the
The first chuck hands 26, 26 are moved forward toward the site , and here, by these respective first chuck hands 26, respective parts 2b, 3b of the body part (sheet material) 2 and the ceiling part (sheet material) 3 are moved. Are clamped (shown in FIG. 5).

In this state, the first chuck hand 2
When 6 and 26 are moved back, the trunk (sheet material)
2 and the ceiling portion (sheet material) 3 are also moved, and the opposing edges 2a, 3 of the body portion (sheet material) 2 and the ceiling portion (sheet material) 3 are moved.
The unwelded portion of a is carried to a predetermined position to be fused by the heater 9 (shown in FIG. 6).

From this state, the opposing edges 2a and 3 are again formed.
A is sandwiched between the heaters 9 and welded (shown by phantom lines in FIG. 6), and the above operation is repeated to weld the body portion (sheet material) 2 and the ceiling portion (sheet material) 3 to each other.

Therefore, welding of the body portion (sheet material) 2 and the ceiling portion (sheet material) 3 is mechanized.

Further, the portions 2c, 3c between the left and right first chuck hands 26, 26 which are moved back by sandwiching the portions 2b, 3b of the body portion (sheet material) 2 and the ceiling portion (sheet material) 3 respectively. a second chuck hand 32 to allow clamping the provided is the second chuck hand 32 as lifting the left and right alignment.

[0020] For this reason, the first chuck hand 26, 26
Body part (sheet material) 2 and ceiling part (sheet material) 3 between
Some 2c, the left and right positioning Te <br/> is pinched by the second chuck hand 32 3c, each opposite edge 2a at a predetermined position of the same heater 9, 3a a Ru is positioned (FIG. 5 a point Chain line,
(See FIG. 6).

Then, the opposed edges 2a and 3a can be mechanically positioned at predetermined positions on the left and right sides of the heater 9 with higher accuracy.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a flexible container 1 as a product, which is a cylindrical body 2
A disc-shaped ceiling portion 3 for closing the upper and lower openings of the body portion 2, a bottom portion 4, a small-diameter cylindrical injection portion 5 attached to the ceiling portion 3, and a small-diameter portion attached to the bottom portion 4. The discharge part 6 and the discharge part 6 are made of resin and are made of a thermoplastic flexible sheet material.

In FIGS. 1 and 3 to 6, reference numeral 8 in the drawings is a welding device for adjoining opposite edges of the sheet material, and the welding device 8 connects the sheet materials which are the respective constituent parts of the flexible container 1 to each other. Weld them together.
For convenience of explanation, the direction of the arrow Fr in the drawing is the front,
The right and left described below means the direction toward the front.

The welding device 8 has a heater 9.
The heater 9 is a high frequency welder, and includes a lower electrode 10
And the upper electrode 11. The lower electrode 10 is fixed on a worktable 12 fixed on the work floor, and the upper electrode 1
1 is directly above the lower electrode 10 and can be moved up and down by a pneumatic first cylinder 13. The following cylinders are all pneumatic cylinders, and these are automatically controlled by an electronic control unit (not shown).

On the left and right sides of the heater 9, a body portion 2 which is a sheet material and a ceiling portion 3 are arranged, and are opposed to each other in the left-right direction.
The facing edges 2a, 3a of the two facing sides 2 , 3 are vertically stacked and placed on the lower electrode 10, and this overlapping portion is sandwiched between the descending upper electrode 11 and the lower electrode 10. And can be welded.

On the right side of the heater 9, one end of a rotating arm 15 is pivotally supported by the first pivot shaft 14 with respect to the work floor, and the other rotating end of the rotating arm 15 is the above-mentioned heater. It is rotatable forward and backward around the first pivot shaft 14 in front of 9. Further, a second cylinder 16 for rotating the rotating arm 15 is provided.

On the rotating end of the rotating arm 15, a left and right rotating base 19 is pivotally supported by a second pivot shaft 18 so as to be rotatable in the left and right directions, and the left and right rotating base 19 is rotated. Three cylinders 20 are provided.

A third pivot shaft 22 is mounted on the left and right turntable 19.
Upper and lower front and rear intermediate portion of the turntable 23 is pivotally supported, before the upper and lower turntable 23, the rear end side is rotatable in the vertical direction respectively by. Further, a fourth cylinder 24 for rotating the up-and-down rotating table 23 is provided.

The rear turning end side 23a of the vertical turning table 23
A pair of left and right first chuck hands 26, 26 are attached to the. Each of these first chuck hands 26 has a pair of left and right gripping claws 27, 27, and these gripping claws 27, 27 can be contacted and separated from each other right and left by a fifth cylinder 28.

The front turning end side 23b of the vertical turning table 23
A sixth cylinder 30 is attached to. This 6th
The piston rod 31 of the cylinder 30 is movable rearward and downward, and the second chuck hand 32 is attached to the piston rod 31. The second chuck hand 32 has a pair of upper and lower gripping claws 33, 33, and these gripping claws 33, 33 are vertically movable by a seventh cylinder 34.

On each of the left and right sides of the work table 12, a forked claw 3 which can be raised and lowered by an eighth cylinder 36 is provided.
7 is provided. When the two-pronged claw 37 rises, its upper end projects above the upper surface of the lower electrode 10, and when it falls, it is located below the upper surface of the workbench 12.

When the rotating arm 15 is rotated back and forth, the first chuck hand 2 is moved along with this.
6 and 26 is toward the site of right and left side of the overlapping part of the two facing edges 2a, 3a, and that reciprocates in the longitudinal direction
Has become. More specifically, the first chuck hand
26, 26 are located in front of the above-mentioned parts,
By the rotation of the rotating arm 15, it is possible to move backward (forward) or forward (return) while drawing an arc around the first pivot shaft 14. The first chuck hand 2
When 6, 26 reaches the above part by its backward movement,
A stopper (not shown) that prevents further rearward movement is provided. Then, the first chuck hand 26,
When 26 reaches the above-mentioned region by its rearward rotation, the above-mentioned forked claw 3 is provided below these first chuck hands 26, 26.
7, 37 are to be located.

By the welding device 8, the body portion 2 and the ceiling portion 3 are
A procedure for welding the two to each other will be described.

First, as indicated by the phantom line in FIG. 3 and the phantom line in FIG. 6, the rotation arm 15 is moved forward by the operation of the second cylinder 16 to move the first chuck hand 26 and the second chuck. The hand 32 is pulled forward from the heater 9.
At this time, the operation of the fourth cylinder 24 causes the rear turning end side 23a of the vertical turning table 23 to move toward the first chuck hand 2.
Rotate upward together with 6.

Further, as shown by the solid line in FIG. 6, the operation of the first cylinder 13 raises the upper electrode 11 to separate the upper electrode 11 from the lower electrode 10.

1 and 3 to 5, the body portion 2 and the ceiling portion 3 are manually arranged to the left and right of the heater 9, and the body portion 2 and the ceiling portion 3 are opposed to each other in the left-right direction.
The opposing edges 2a and 3a of the above are vertically stacked on the lower electrode 10. In this case, the center of the ceiling 3 is the first pivot 1
It is configured to be substantially coaxial with the No. 4. Then, the upper electrode 11 is lowered by the operation of the same first cylinder 13, and the opposing edges 2a and 3a are sandwiched between the upper electrode 11 and the lower electrode 10 and welded.

Next, as shown by the solid line in FIG. 6, the upper electrode 11 is moved up by the operation of the first cylinder 13 of the above. In this case, the portion indicated by reference numeral 38 in FIGS. 2 and 5 is the welded portion.

As shown by the phantom line in FIG. 1, FIG. 3, and FIG. 4, the rotation arm 15 is moved by the operation of the second cylinder 16.
Is rotated rearward, whereby each first chuck hand 2
6 is moved backward (forward) to a predetermined portion on each of the left and right sides of the welded portion 38.

On the other hand, the operation of the eighth cylinder 36 raises the bifurcated claw 37, and the parts 2b, 3b of the body 2 and the ceiling 3 corresponding to the bifurcated claw 37 are connected to the lower electrode 10.
Push up above the upper surface of.

As shown by the solid line in FIG. 1 and FIG. 5, the operation of the fourth cylinder 24 causes the rear rotation end side 23a of the vertical rotation base 23 to rotate downward so that the first chuck hand 26 moves to the left and right. The grip claws 27, 27 are externally fitted to the parts 2b, 3b. Next, by operating the fifth cylinder 28, the first cylinder
The chuck hands 26 hold the parts 2b and 3b. After that, the forked claw 37 is lowered by the operation of the eighth cylinder 36.

From the above state, as shown by the phantom line in FIG. 3 and the solid line in FIG. 6, the second cylinder 16 is actuated to rotate the rotating arm 15 forward, and along with this, each first The chuck hand 26 is moved forward (backward).

Then, the opposing edges 2 of the body 2 and the ceiling 3
The a and 3a are moved forward by the left and right first chuck hands 26 and 26 on the lower electrode 10 and the work table 12 while drawing an arc around the first pivot shaft 14. in this case,
The amount of forward movement of each first chuck hand 26 is determined by the welding portion 38.
This is until the rear end reaches the front end of the joint between the lower electrode 10 and the upper electrode 11. As a result, the non-welded opposing edges 2a and 3a subsequent to the welded portion 38 are positioned on the lower electrode 10. Further, since the center of each of the first chuck hands 26 moving in an arc shape and the center of the ceiling portion 3 are substantially coaxial, the facing edge 3a thereof is more accurately guided onto the lower electrode 10. It

As described above, the left and right first chuck hands
26, 26 pinch each part 2b, 3b to move forward (return
Motion), as indicated by the alternate long and short dash line in FIGS. 5 and 6,
By the operation of the sixth cylinder 30, the second chuck hand 32
Moves rearward and downward, and then, by operating the seventh cylinder 34, the body portion 2 between the left and right first chuck hands 26, 26 and the portions 2c, 3c of the ceiling portion 3 are clamped.

Then, as shown in FIG. 4, by the operation of the third cylinder 20, the left and right turntable 1 is rotated around the second pivot shaft 18.
9 is rotated to the left and right, and along with this, the second
The grip claw 33 of the chuck hand 32 is rotated left and right to adjust the left and right position of the second chuck hand 32.
It That is, the above-mentioned process is performed so that the overlapping portion of the opposed edges 2a and 3a reaches a predetermined position on the lower electrode 10 of the heater 9 .
The horizontal position is adjusted. In this case, a worker who is behind the heater 9 makes a hand so that the facing edges 2a and 3a are accurately overlapped on the lower electrode 10.

In FIG. 6, the upper electrode 11 descends from the above-mentioned state, and again, the upper electrodes 11 and the lower electrode 10 are welded with the opposite edges 2a and 3a on the lower electrode 10 sandwiched therebetween.

Thereafter, the above operation is repeated to weld the body 2 and the ceiling 3 to each other. Also, as in the above, the body 2
The bottom part 4 can also be welded.

Although the above is based on the illustrated example, all or some of the cylinders may be hydraulic or electric, or may be solenoid. Further, each first chuck hand 26 has a pair of grasping claws 27, 27 in front and rear.
It may be equipped with. Further, although each of the above cylinders is automatically controlled, for example, the first cylinder 13 may be manually operated. Further, both sheet materials welded to each other may be a combination of circular or rectangular flat plates, tubular bodies, and the like.

[0049]

According to the present invention, the welding device can be installed in the left and right directions.
In the case of providing the overlapping portion obtained by superimposing the right and left opposing edges of the opposing sheet one above the other in the direction, the heater is capable welded across the top and bottom, parts of the right and left sides of the upper SL overlapping portions toward the provided left and right <br/> pair of first chuck hand which reciprocates in the back-and-forth direction, said overlapping portions each first chuck hand was moved forward to the site of each side of the of the sheet material It is possible to move back by pinching a part.

For this reason, when welding the facing edges of the sheet material, first, the facing edges that are superposed on each other are sandwiched by a heater and then welded, and then, the welding portions of the facing edges of the sheet material are welded. The first chuck hand is moved forward toward the side portion , where each part of the sheet material is held by each of the first chuck hands.

When the first chuck hand is moved back in this state, the sheet material also moves accordingly, and the unwelded portions of the opposing edges of the sheet material are attempted to be welded by the heater. It is carried to a predetermined position.

From this state, the opposing edges are again sandwiched by the heaters and welded, and the above operation is repeated thereafter,
The sheet material is welded.

Therefore, when welding the sheet material ,
In the past, many workers were required, but this is mechanized, so that the number of workers is sufficient, and the welding work can be easily performed even when the sheet material is heavy.

In addition, the above-mentioned welding device focuses on the characteristic that the sheet material is flexible and moves and positions it by gripping a part of it with a chuck hand. Since each chuck hand has a simple structure, there is an advantage in that the welding device also has a simple structure.

Further, a second chuck hand is provided between the left and right first chuck hands that hold back a part of each of the above-mentioned sheet materials to hold a part of the same sheet material.
Certain chuck hand as lifting the left and right alignment.

[0056] Therefore, a portion of the sheet material between the first chuck hand and the left and right positions adjusted by sandwiching the second chuck hand, when the positioning of the respective opposite edge at a predetermined position of the same heater, the upper Symbol Each opposing edge can be mechanically positioned at a predetermined position on the left and right of the heater with higher accuracy.

Therefore, the molding of the product is further mechanized and a high quality product is obtained.

[Brief description of drawings]

FIG. 1 is an overall side view.

FIG. 2 is a perspective view of a flexible container.

FIG. 3 is an overall plan view.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a perspective view showing a welded state of a body portion and a ceiling portion.

FIG. 6 is an explanatory view of the operation corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible container (product) 2 Body part (sheet material) 2a Opposite edge 2b Part 2c Part 3 Ceiling part (sheet material) 3a Opposite edge 3b Part 3c Part 8 Welding device 9 Heater 15 Rotating arm 26 No. 1 chuck hand 32 second chuck hand 37 bifurcated claw

Claims (1)

[Claims] 1. A welding device for opposing edges of a sheet material, comprising a heater for sandwiching an overlapping portion in which the left and right opposing edges of sheet materials facing each other in the left-right direction are vertically sandwiched from above and below to be welded. in, toward the site of right and left side of the upper SL overlapping portions, front and rear
Providing a pair of left and right first chuck hands that reciprocate in one direction ,
It said overlapping portions each first chuck hand was moved forward to the site of the lateral of the possible backward by sandwiching a portion of the sheet material, and backward by holding a portion of the sheet material left and right portions of the same sheet material between the first chuck hand providing the second chuck hand to enable clamping, welding apparatus of the opposite edges to each other in the second chuck hand lateral positions adjustable with the sheet over preparative material.