JPH032735B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a top sealing device for thermally welding a cylindrical tip film that wraps around a packaged item when packaging with a film, and between the front and back of the packaged item, the end seal, and the top seal. The purpose is to minimize the amount of space created.

Conventional general pillow packaging machines using film are fed sequentially by a feed conveyor, etc.
The item to be packaged is placed in a bag-making device and wrapped in a packaging film that has been unwound from a film roll, and then both longitudinal edges of the packaging film are continuously welded by a sealer adjacent to the bag-making device. Form into a cylinder.

On the other hand, the objects to be packaged are enclosed within the cylindrical film at regular intervals, and the welding device welds the top and end portions of the cylindrical film that is not enclosed within the cylindrical film, and cuts the welded portion. By separating, film packaging is completed.

That is, a method is adopted in which the end sealing of the preceding cylindrical film to be packaged and the top sealing of the succeeding cylindrical film to be packaged are performed simultaneously by a welding device, and the welded portion is cut at the center with a cutter to separate them.

However, in the above method, since one side of the cylindrical film of the adjacent items to be packaged is sealed at the same time, it is necessary to set the welding position with a sufficient margin so as not to contact both items. This creates a space between the packaging and the packaging, making it difficult to handle and giving an unsightly appearance.

In addition, in shrink-type packaging machines for the purpose of sealed packaging, the above-mentioned doubleness is corrected by passing it through shrinkage, but the packaged items may be limited or deformation due to shrinkage may occur. It was not possible to fully eliminate the shortcomings.

Therefore, in the present invention, each item to be packaged is individually end-sealed and top-sealed, and after the end-sealing, the item to be packaged is pushed toward the end-seal side, and the top-seal is welded while the end of the top-seal is suctioned. A first pushing mechanism is provided with a stopper that can be opened and closed at the tip of a cylindrical film supply conveyor that accommodates the object to be packaged and has an open top edge; a second pushing mechanism provided with a group of rotating rollers that press the packaged items against a holding plate erected at the front thereof; and a lateral movement mechanism for feeding the cylindrical film from the second pushing mechanism to the top seal mechanism.

Next, to explain the operation, a cylindrical film that wraps around the packaged item and leaves only an end seal and has an open top edge is conveyed by a supply conveyor, presses against a stopper that can be opened and closed at the tip of the supply conveyor, and the cylindrical film The items to be packaged inside are moved to the rear end. Then, the stopper opens and the cylindrical film is further conveyed from the supply conveyor in the same direction by a group of rotating rollers, the cylindrical film hits the holding plate, the packaged items are further pushed into the end part, and the seal created by the movement of the packaged items is closed. The wrinkles are gradually smoothed out toward the top edge using a group of rotating rollers.

Further, the cylindrical film is transferred to a top sealing mechanism arranged side by side by a lateral movement mechanism, and while the top edge is pulled by a suction port, the front part of the packaged item is thermally welded.

The drawing shows an embodiment of the apparatus of the present invention, in which 4 wraps the packaged object 1 with a film in the same way as a conventional packaging machine, seals the center, and then seals the ends with the welding mechanism 3, and then wraps the packaged object 1 in a film to form a cut cylinder. This is a supply conveyor that sequentially conveys the films 2, and a stopper 6 that can be opened and closed is installed at the tip of the supply conveyor 4.

The stopper 5 opens and closes in response to a signal from a phototube 6 set at the tip of the supply conveyor 4, and after holding down the cylindrical film 2 for a certain period of time, opens and sends the cylindrical film 2 to the successively installed rotating rollers 7, 7, . . .

The rotating rollers 7, 7, . . . actively rotate individually, and a restraining plate 8 is erected in front of the most advanced roller 7. A proximity switch 9 is attached to the holding plate 8, and after holding down the cylindrical film 2 for a certain period of time, it sends an activation signal to the lateral movement mechanism.

The lateral movement mechanism consists of a transfer arm 10, a vertical cylinder, and a transfer cylinder 12, and the cylindrical film 2 is lifted by the transfer arm 10 located below between the rotating rollers 7, 7, A transfer cylinder supporting the cylinders transfers the cylinders to the top seal mechanism installed in parallel.

The top seal mechanism is opposed to the heat plate 1.
3 and 13 are brought into contact with cylinders 14 and 14, and the open top part of the sandwiched cylindrical film 2 is welded. The structure is such that the open top end of the film 2 is sucked.

After the top seal is applied, the remaining end is cut off and the process moves on to the packaging process.

As described above, in the device of the present invention, the cylindrical film that is supplied leaving a space between the end seal section and the rear part of the packaged object hits the stopper of the first pushing mechanism, and the packaged object is pushed toward the end seal section. This has the effect of filling the space between the end portion and the second pushing mechanism, and the space is almost completely eliminated by the holding plate of the second pushing mechanism.

Since the second pushing mechanism transports and presses the cylindrical film as self-rotating rollers that actively rotate individually, wrinkles that occur in the cylindrical film as it moves toward the end of the packaged object can be removed from the open top of the cylindrical film. This has the effect of pushing the

In addition, if the rotation speed of the rotating roller is suppressed, and the rotating roller closer to the plate is rotated at a higher speed, the cylindrical film will hit the holding plate at an increased speed, which will have the effect of increasing the pushing action of the packaged object, and will also increase the speed of the cylindrical film. It also becomes more effective in elongating wrinkles that occur at the top of the skin.

Furthermore, since the top end of the cylindrical film is drawn into the suction port during top sealing and welded while being pulled, the cylindrical film is prevented from loosening and can be welded in close contact with the packaged item.

Therefore, the apparatus of the present invention can provide packages with a high degree of sealing, which could not be obtained with conventional pillow packaging machines, and can provide packages with good appearance.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the device of the present invention, and FIG. 2 is a side view of the lateral movement mechanism. Code, 1 is the packaged object, 2 is the cylindrical film, {4
is a supply stopper, 5 is a stopper, 6 is a phototube} first pushing mechanism, {7 is a rotating roller, 8 is a holding plate, 9 is a proximity switch} second pushing mechanism,
{10 is the arm, 11 is the vertical cylinder, 12
is a transfer cylinder} Lateral movement mechanism, {13 is a heat plate, 14 is a cylinder, 15 is a suction port,
16 is the blower top seal mechanism.

Claims (1)

[Scope of Claims] 1. A first pushing mechanism that is provided with a stopper that can be opened and closed at the tip of a cylindrical film supply conveyor that accommodates an object to be packaged and has an open top edge; a second pushing mechanism provided with a group of rotating rollers that press the packaged item against a restraining plate erected at the front while transporting the package; a top sealing mechanism having a cylindrical film top end suction port disposed in parallel with the second pushing mechanism; and a lateral movement mechanism for feeding the cylindrical film from the second pushing mechanism to the top sealing mechanism. 2. The top sealing device for a cylindrical film for packaging according to claim 1, wherein the number of revolutions of the group of rotating rollers of the second pushing mechanism is set such that the rollers located closer to the restraining plate have a higher number of revolutions.