JPH06102454B2 - Film welding equipment for packaging equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film welding device of a packaging device for welding a folded portion of a stretch film folded at the bottom of the packaging device of a packaging device for packaging an article to be wrapped with a stretch film.

[0002]

2. Description of the Related Art Conventionally, as this kind of technique, Japanese Patent Laid-Open No. 63-
There is a packaging device disclosed in Japanese Patent No. 24816. In the packaging device, the film device for welding the folded portion of the stretch film folded to the bottom of the article to be packaged has a heater roller arranged at the carry-out portion of the packaging device, and the heater roller is attached to the heater body from a heater plate. It had a structure in which it was heated by radiant heat and the folded portion of the stretch film was welded by the heat of the heater roller.

[0003]

However, in the above structure, since the heater roller is rotated to transfer the package, no sound is produced unless a gap is designed between the heater plate and the heater roller. Since this gap acts as a heat insulating layer for heat due to air, heat is difficult to be transmitted to the heater roller, so that there is a problem that the temperature of the heater main body must be raised to maintain the temperature at which the heater roller can be film-welded. there were.

Since the heater main body is heated to a high temperature, the peripheral members of the heater roller are also heated, which not only lowers the commercial value of the packaging device, but also heats members other than the heater roller, which makes the operator uncomfortable. There was an occasion.

The present invention has been made in view of the above points, and an object of the present invention is to provide a film welding apparatus for a packaging apparatus, which can eliminate the above problems and efficiently transfer heat from the heater body to the heater roller. .

[0006]

In order to solve the above-mentioned problems, the present invention has a heater roller provided in a conveying path of a carry-out section of a packaging device for packaging an article to be packaged with a stretch film so that the bottom portion of the article is packaged. In the film welding device of the packaging device for welding the overlapping portion of the folded film, the heater roller has a structure in which a shaft is inserted into a cylindrical heater roller body or a structure in which the heater roller body and the shaft are integrally formed, A heater main body is arranged in the lower part of the conveying path, a heater plate is attached on the heater main body, and a plurality of the heater rollers are arranged in parallel by a bearing arranged on the heater plate so as to be orthogonal to the conveying direction of the conveying path. The heat generated in the heater main body is guided to the heater roller body through the heater plate and the bearing and folded into the bottom portion of the packaged portion carried out on the heater roller body. Characterized by welding the overlapped portion of the beam.

The heater roller body of the heater roller is characterized in that the central portion of the conveying path is small and many heater roller bodies are arranged on both sides thereof.

The heater roller of the heater roller is characterized in that irregularities are formed on its surface.

[0009]

According to the film welding apparatus of the present invention, the heat generated in the heater body is guided to the heater roller body through the heater plate, the bearing and the shaft of the heater roller, so that they are made of an aluminum material having a high thermal conductivity. With this, the heat generated in the heater body can be efficiently transferred to the heater roller body.

Further, by arranging the heater roller bodies at the center of the transport path in a small number and arranging a large number on both sides thereof, a large amount of heat is applied to a portion where the films are overlapped at the front and rear and the left and right of the bottom of the packaging section to ensure welding. Since the films do not overlap each other and a small amount of heat is applied to the central part, it is possible to prevent the film from being melted, that is, torn.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the overall configuration of a packaging device using the film welding heater device of the present invention will be described. FIG. 7 is a view showing the outer appearance of the packaging device, FIG. 9 is a partial cross-sectional plan view of the packaging machine, and FIG.

The packaging device has a carry-in section 10 for carrying in an article to be packaged.
0, Elevator unit 2 for raising the loaded packaged object
00, a wrapping section 300 for wrapping the raised object to be wrapped with a stretch film, a unloading section 400 for unloading the wrapped article, a console section 500 for controlling the operation of the wrapping apparatus, and various information on the upper part of the wrapping article. It is provided with a labeling section 600 for attaching a printed label.

The carry-in section 100 is a pusher conveyor 101.
And the weight detection unit 102 and the like are provided, and after the loaded packaged object is weighed, it is transferred to the elevator head 201 of the elevator unit 200 by the pusher conveyor 101. The elevator section 200 raises the article to be packaged on the elevator head 201 to the packaging section 300 and pushes up the stretch film stretched in advance.

The packaging unit 300 includes left and right folding plates 301, 3
02, a rear folding roller 303, a front folding roller 304, a pusher 305, and the like. The left and right ends of the stretch film, which covers the article to be wrapped with the left and right folding plates 301 and 302, are folded into the bottom of the article to be wrapped, and subsequently, the rear ends of the stretch film are folded into the bottom of the article to be wrapped with a rear folding roller 303, and further, The pusher 305 pushes out the article to be packaged, and the front folding roller 304 folds the rear end of the stretch film to the bottom of the article to be packaged and is delivered to the carry-out section 400.

The labeling section 600 is a label printer 60.
1, a column 602, a label issuing port 603, and a label printer supporting unit 604. The label printer 601 is rotatably suspended by the label printer supporting unit 604, and a label is issued on the upper portion of the packaging unit carried out to the carry-out unit 400. Mouth 603
Apply the label by spraying.

Since the details of the packaging device having the above structure are disclosed in Japanese Patent Application No. 62-77113 previously filed by the present applicant, the detailed description thereof will be omitted here.

The carry-out section 400 includes a roller conveyor 410 adjacent to the packaging section 300, a heater section 420 for welding the folded section of the film folded at the bottom of the article to be packaged, a carry-out conveyor 450 adjacent to the roller conveyor 410,
A carry-out roller conveyor 470 is arranged adjacent to the carry-out conveyor 450.

1 to 6 are views showing details of the carry-out section 400. FIG. 1 shows a roller conveyor 410 and a heater section 420.
2 is a partial cross-sectional plan view showing the structure of FIG. 2 (X-X cross-sectional view of FIG. 2), FIG. 2 is a Y-Y cross-sectional view of FIG. 1, and FIG. 4, FIG. 4 is a partial cross-sectional plan view of the entire carry-out section, FIG. 5 is a cross-sectional view taken along the line XX in FIG. 4, and FIG.
7A and 7B are perspective views of the heater roller, respectively.

The roller conveyor 410 has a structure in which a plurality of rollers 416 are arranged in parallel on bearing members 411 and 411 arranged on both sides and are rotatably supported. A timing pulley 412 is fixed to the shaft end of each roller 416, and the timing pulley 412 and the timing pulley 41
An idle roller 413 is interposed between the two.
The drive timing pulley 414 is rotated through a drive gear 427 fixed to the end of a shaft 472, which will be described later, and a gear 415 that is integrally connected to the timing pulley 414.
The roller 416 rotates in the same direction by winding and rotating the timing belt 418 around the roller.

A heater section 420 is arranged below the roller conveyor 410 on the downstream side. The heater section 420 includes a heater body 421, and a central portion of the heater body 421 is fixed to a heater body mounting plate 423 with a heat insulating material 422 interposed. Reference numeral 424 denotes a heater plate, and heater rollers 425 are arranged on the heater plate 424 at predetermined intervals. The shaft 425a of the heater roller 425 rotatably supports both ends of the shaft 425a on the bearing members 411 and 411, and the shaft 425 between the heater roller bodies 425b.
A bearing 426 that rotatably supports a is provided. The bottom surface of the warp bearing 426 is in contact with the heater plate 424. The timing pulley 4 is also provided at the end of the shaft 425a.
12 is fixed, and like the roller 416, the rotational force is obtained from the timing belt 418 to rotate in the same direction as the roller 416. By using this timing belt, the driving is less noisy than the power transmission by gears.

The heater roller 425 has a structure in which a shaft 425a is inserted through a plurality of heater roller bodies 425b (four in the figure). The heater roller body 425b is shown in FIG.
As shown in FIG. 7A, a ring-shaped protrusion is provided to form irregularities on the surface, or as shown in FIG. 7B, rectangular protrusions are provided to form irregularities on the surface. As a result, the contact area of the heater roller body 425b with the film is reduced, so that the surface pressure is increased and welding can be performed in a short time. The protrusion is not limited to a ring shape around the heater roller body 425b as shown in FIG. 7A, or a rectangular surface as shown in FIG. 7B. May be circular or polygonal.

In the case of the two heater rollers 425 located on the upstream side as shown in FIG. 1, the heater roller body 425b is inserted through the shaft 425a at equal intervals, but the heater roller located on the downstream side is formed. 425 is arranged so as to cover between the heater roller body 425b and the heater roller body 425b on the upstream side, and the heater roller body 425b in the central portion of the conveyance path is small and many are arranged on both sides thereof.

The heater plate 424, the bearing 426, and the heater roller body 425b are made of an aluminum material having good thermal conductivity, and the surface of the heater roller body 425b is coated with Teflon to prevent sticking of a film. . The heat generated by the heater main body 421 is generated by the heater plate 42.
4, the bearing 426 and the shaft 425a, and is transmitted to the heater roller body 425b. Therefore, the heat of the heater plate 424 is
It does not reach the members around the bearing members 411 and 411 at both ends of the shaft 425.

A plurality of bearings 42 inserted in the shaft 425a
6 is difficult to assemble when the bearing 426 is fixed to the heater plate 424, so that it is difficult to assemble the heater plate 424.
Do not fix to 4 with screws. Therefore, a guide member is arranged between the shafts 425a and 425a, the guide member is fixed to the heater plate 424, and the guide member and the guide member hold the optimum position of the bearing 426. Therefore,
Despite the large number of bearings 426, the assemblability is improved. Further, since this guide member surrounds the Heroler body 425b from both sides, it also has the function of heating the heater roller body 425b by heat radiation from the guide member.

If a heat transfer material such as silicon is interposed between the heater plate 424 and the bearing 426, the heat transfer property is further improved. If the bearing 426 is small,
It may be fixed to the heater plate 424 with screws or the like. A carry-out conveyor 450 is arranged adjacent to the downstream side of the heater unit 420. The carry-out conveyor 450 includes a plurality of rollers 4.
51 and a timing belt 452 arranged between the roller 451 and the roller 451. Further, a pusher 453 is provided on the timing belt 452,
The pusher belt conveyor 454 is configured.

A plurality of side rollers 455 are provided at the downstream end of the rollers 451 of the carry-out conveyor 450, and the articles carried out from the roller conveyor 410 onto the carry-out conveyor 450 are pushed by the pushers 453 of the pusher belt conveyor 454. The transfer is carried out in a direction perpendicular to the carrying-out direction of the roller conveyor 410. A pusher initial position detector 457 (transmissive sensor) fixed to a support member 456 is provided below the carry-out conveyor 450. The pusher initial position detector 457 detects the initial position of the pusher 453 of the pusher belt conveyor 454.

Adjacent to the downstream side of the carry-out conveyor 450,
An unloading roller conveyor 470 including a plurality of unloading rollers 471 is arranged. The carry-out conveyor 45
0 and a shaft 472 below the carry-out roller conveyor 470.
A drive pulley 458 for driving the roller 451 and a drive pulley 473 for driving the carry-out roller 471 are fixed to the shaft 472. The drive gear 427 is fixed to one end of the shaft 472.

A rubber belt 459 is wound around the drive pulley 458, and a rubber belt 474 is wound around the drive pulley 473. The rubber belt 459 is in contact with the lower surface of the roller 451, and the roller 451 is subjected to frictional force.
It is designed to transmit power to the rubber belt 474.
Also comes into contact with the carry-out roller 471, and similarly, power is transmitted by frictional force. The roller 45
In order to ensure the transmission of power to the roller 1 and the roller 471, a plurality of idle pulleys 458a and 473a are arranged below the rubber belt 459 and the rubber belt 474 to receive the rubber belt 459 and the rubber belt 474.

The motor M1 includes a carry-out roller 471, a roller 451, a heater roller 425 and a roller 41.
6 is a motor for driving 6. That is, the rotation force of the motor M1 is transmitted to the shaft 472 via the timing pulley 475 and the timing belt 476, and further transmitted from the drive pulley 458 to the roller 451 via the rubber belt 459 to rotate the roller 451. Further, the rotational force is transmitted from the drive pulley 473 attached to the shaft 472 to the carry-out roller 471 via the rubber belt 474, and the carry-out roller 471 rotates. Further, by the drive gear 414 attached to the shaft 472 described above, the roller 416 of the roller conveyor 410 and the heater section 42.
The zero heater roller 425 rotates.

The motor M2 is a motor for driving the pusher belt conveyor 454. That is, the motor M2
Due to the rotation, the rotational force is transmitted to the timing drive pulley 461 via the timing belt 477, and the pusher belt conveyor 454 wound around the timing drive pulley 461 and the timing driven pulley 462 is rotated. The carry-out conveyor 45
0, the roller 451, and the unloading roller conveyor 470 toward the unloading roller 471, in order to smoothly transfer the package, the timing belt 45 of the unloading conveyor 450
A delivery plate (not shown) is arranged between the two.

Further, in the figure, S1 is a reflection type sensor, and S2 is a reflection mirror which reflects the light from the reflection type sensor S1. Further, S3 is a reflection type sensor, S4 is a reflection mirror for bending the light from the reflection type sensor S3 by 45 °,
S5 is a reflecting mirror that reflects the light from the reflective sensor S3. That is, the reflective sensor S1 is the roller conveyor 41.
The sensor is a sensor that detects an article carried out from 0, and the reflective sensor S3 is a sensor that detects an article carried out from the carry-out conveyor 450. The reflective sensor S1,
The reflective sensor S3 uses a detector made of glass fiber to prevent noise from the outside.

FIG. 11 is a view for explaining the outline of the operation of the carry-out section 400 having the above structure. First, when the pusher initial position detector 457 detects the pusher 453, the pusher belt conveyor 454 is stopped. In this state, the to-be-packaged object A in which the left and right ends and the front and rear ends of the film are folded at the bottom in the wrapping section 300 of the wrapping machine is carried out by the pusher 305 onto the roller conveyor 410 as shown by an arrow F1.

When the pusher reverse rotation position detector 312 detects that the pusher 305 has pushed the package completely onto the roller conveyor 410 by detecting the flag 313 attached to the pusher drive shaft 310, the motor M is detected by this detection signal.
1 is started, and the roller 416, the roller 451 and the carry-out roller 471 are started. At this time, the folded film portion at the bottom of the package faces the heater roller 425.
Next, when the light emission sensor S1 detects the front end of the article A to be packaged,
After a predetermined time (the front end of the packaged object is the heater roller 425
The motor M1 is stopped, and the roller 416, the heater roller 425, the roller 451 and the carry-out roller 471 are stopped for a predetermined time. This causes the heat of the heater roller body 425b of the heater roller 425 to weld the overlapping portion of the folded film.

Next, the motor M1 is activated, the rollers 416, the rollers 451 and the carry-out rollers 471 are activated again, and they are stopped after a predetermined time. This predetermined time is the time required for the objects to be packaged wrapped by the rollers 416 and 451 to be transferred and to completely strike the side rollers 455. As a result, the article A to be packaged 45
0, and hits the side roller 455. Then, the motor M2 is started, and the pusher belt conveyor 4
54 is activated. As a result, the encapsulated package is pushed by the pusher 453 while being carried out by the unloading roller conveyor 470.
Be delivered to. At this time, the pusher initial position detector 45
When 7 detects the pusher 453 or the package, the motor M2 is stopped and the pusher belt conveyor 454 is stopped.

When the light emitting sensor S3 detects the front end of the article A to be packaged, a label ejected from the label issuing port 603 of the labeling section 600 after a predetermined time is sprayed and attached to the upper surface of the article A to be packaged. The motor M1 is activated to activate the carry-out roller 471, and the packaged object is carried out to the outside or the next working device. In this case, although the label is attached on the basis of the front end of the object to be packaged A, the label may be attached on the basis of the rear end of the object to be packaged.

If the operator presses the product number key, the motor M1 is activated as the final processing (the packaging machine also enters the final processing and repeats a predetermined operation even if the weight of the object to be packaged is not detected). The package is carried out by the carry-out roller conveyor, and the activation of the motor M1 is stopped after a predetermined time. If the product number key is not pressed, pusher 30
By the detection of the flag of the reverse rotation position detector for detecting the reverse rotation position of No. 5, the previous package is carried out by the carry-out roller conveyor 470 when the motor M1 is started, and the motor M1 is stopped when the next package is detected by the light emission sensor S1. Let Although the detection is performed by the reverse rotation position detector 312 of the starter pusher 305 of the roller conveyor 410, it may be started by the detection of the pusher 305.

The stop time of the heater roller 425 is
When the weight of the package is large, it is short, and when it is small, it is long. That is, as the weight increases, the heater roller 4
Since the pressure contact force between the heater roller body 425b of No. 25 and the package is large, proper welding can be performed even if the time is short. Further, it is further effective to use a bearing bush made of a material such as a copper-based metal or a fluorine-processed aluminum metal having good thermal conductivity for the bearing 426 and a bearing bush made of a material having poor thermal conductivity for the bearing member 411. Target.

Further, the stop time of the heater roller 425 is preset according to the weight of the packaged product (product), the product number, and the tray type, and the stop time (welding time) can be controlled by setting the product number and the like. Good.

In the above embodiment, the bearing 426 is only mounted on the heater plate 424.
By fixing 6 to the heater plate, the thermal conductivity can be further improved.

Further, in the above embodiment, the heater roller 4
25 has a structure in which it is rotated by a timing belt 418 via a timing pulley 412, but a bearing 426 that fixes a heater roller 425 to a heater plate 424.
Needless to say, the structure may be rotatably supported only by itself and rotatably supported by other rotating means. Further, the package may be moved on the heater roller 425 by a manual operation of the operator without providing the driving means for the heater roller 425.

Further, in the above embodiment, the heater roller 4
No. 25 heater rotor body 425b and shaft 425a are separate bodies and the shaft 425a is inserted through the heater rotor body 425b.
Of course, it is also possible to process and together.

[0042]

As described above, according to the present invention, the heat generated in the heater body is guided to the heater roller body through the heater plate, the bearing and the shaft of the heater roller, and the heat of the heater body is efficiently transmitted. Therefore, the heat required for film welding can be obtained without raising the temperature of the heater main body as in the conventional example.

Further, since the heat of the heater plate is transferred to the bearing and the heater roller body, it is difficult to transfer the heat to both ends of the shaft. Therefore, even if an operator touches this part, the package does not feel uncomfortable. Improve the commercial value of the device.

Further, since the heat is efficiently transferred to the heater roller, the temperature above the heater roller does not become high, the commercial value of the packaged product is not lowered, and the overlapped portion of the film can be reliably welded. . Since the temperature around the heater roller does not become high, the overlapping parts of the film are reliably welded without reducing the commercial value of the packaged product.

By arranging the heater roller bodies at the center of the transport path in a small amount and arranging a large number on both sides thereof, a large amount of heat is applied to the overlapped portions of the films at the front and rear and the left and right of the bottom of the packaging section to ensure welding. A little heat is applied to the central part where there are few overlapping parts of the film, and the film melts,
That is, breakage can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing the structure of a carry-out section roller conveyor of a packaging apparatus of the present invention.

FIG. 2 is a sectional view taken along the line YY of FIG.

FIG. 3 is a sectional view taken along the line ZZ of FIG.

FIG. 4 is a partial cross-sectional plan view showing the overall structure of the carry-out section of the packaging device of the present invention.

5 is a cross-sectional view taken along the line XX of FIG.

6 is a cross-sectional view taken along the line VV of FIG.

FIG. 7 is a perspective view of a heater roller body of a heater roller.

FIG. 8 is an external view of the packaging device of the present invention.

FIG. 9 is a partial cross-sectional plan view of the packaging machine of the packaging device of the present invention.

10 is a cross-sectional view taken along the line WW of FIG.

FIG. 11 is a view for explaining the outline of the operation of the carry-out section of the packaging device of the present invention.

[Explanation of symbols]

 100 carry-in section 200 elevator section 300 packaging section 400 carry-out section 500 console section 600 labeling section

Claims (3)

[Claims] 1. A film welding device for a packaging device, wherein a heater roller provided on a conveying path of a carry-out portion of a packaging device for packaging an article to be packaged with a stretch film welds an overlapping portion of films folded at the bottom of the packaged portion. In the device,
The heater roller has a structure in which a shaft is inserted into a cylindrical heater roller body or a structure in which the heater roller body and the shaft are integrally formed. A heater plate is attached to the heater plate, and a plurality of the heater rollers are arranged and supported in parallel by the bearings arranged on the heater plate so as to be orthogonal to the conveyance direction of the conveyance path. A film welding apparatus for a packaging device, which guides a heater roller through the heater plate and the bearing to a heater roller body, and welds an overlapping portion of the film folded on the bottom portion of the packaged portion carried out on the heater roller body. 2. The film welding device of a packaging apparatus according to claim 1, wherein the heater roller body of the heater roller is provided in a small number in the central portion of the conveying path and is arranged on both sides thereof. 3. The film welding apparatus for a packaging device according to claim 1, wherein the heater roller body of the heater roller has irregularities formed on a surface thereof.