JPH05221424A - Fitting bag - Google Patents

Abstract

PURPOSE:To prevent a slack from occurring to a place between the bottom of an empty box and a film bag fitted therein when the bag made of thin film is put upside down on top of the empty box and the bag is fitted to the inside of the empty box by air blown thereon from above. CONSTITUTION:Nozzles 29, 33 through which air is blown in are provided not only on both ends in the longitudinal direction of a rectangular bottom of an empty box 25, but also to the center of the bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a bag made of a thin film is placed upside down on an empty box, and air is blown from above to attach the bag to the inner surface of the empty box.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Laid-Open No. 62-251324 discloses an automatic device for mounting a bag made of polyethylene or the like on the inner surface of an empty box for storing items. This automatic device is provided with an air blower device, and a method of mounting the bag on the inner surface of the empty box by blowing air from above the bag which is placed upside down on the empty box is adopted.

That is, as shown in FIG. 4, the film 3 unwound from the roll of film 1 by the rotation of a motor (not shown) is applied to the roller 5, and then returned once to be applied to the tension bar 7 and then to the next roller 9. Both ends in the vicinity of the tip are gripped by the first chuck 11 which works as a pair through
First chain 1 provided with a first chuck 11
It moves with the movement of 3. Film 3 is a stack of 2 sheets,
It has a cylindrical shape when opened. The moved film 3 is sealed by welding by the sealing / cutting device 15 and simultaneously cut into a single bag 17. The tip of the bag 17 is held downward by the first chuck 11 while being held downward, and is sucked and spread by the pair of suction pads 19 from both sides. In the unfolded state, two pairs are unfolded by the second chuck 21 working in pairs, and the four corners of the mouth edge facing downward are grasped. Then, the bag 17 is put on the box 25 by moving with the movement of the second chain 23 provided with the second chuck 21. In the process, air is blown into the box 25 from above the bag 17 by the air blower device 27.
Is turned upside down and is gradually lowered and mounted on the inner surface of the box 25.

The air blower device 27 had four air nozzles 29. That is, when the bottom surface of the box 25 has a rectangular shape, for example, a pair of air nozzles 29 (one in which the central air nozzle is not provided in FIG. 1) are arranged at both ends of the rectangular shape in the longitudinal direction. Then, the air is blown all at once by these four air nozzles 29.

[0005]

The air blower device of the prior art described above is provided with a pair of air nozzles 29 at both longitudinal ends of the rectangle so as to correspond to the rectangle of the bottom of the empty box 25. With such an arrangement of air nozzles, for example, as shown in FIG. 5, a slack 31 may occur at the center of the bottom surface of the attached bag 17. When such slack occurs, the folded portion at the edge of the bag is insufficient,
As a result, the bag cannot be kept attached to the box, and it is difficult to store the product through the bag inside the box.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a bag mounting method which does not cause slack in the center of the mounted bag.

[0007]

In order to achieve the above object, a bag mounting method according to the present invention is directed to an upper part of an empty box in which an opening edge portion of a bag made of a thin film is opened upward in a downward state. From the upper part of the bag, air is blown toward the inside of the empty box by the air blower device, so that the bag turns inside out of the empty box and is folded back to the outside. In the wearing method,
The air blower device has an air nozzle group that is oriented at a right angle to the bottom surface of the empty box, and each of the air nozzle groups includes a pair of air nozzles arranged at both ends in the forming direction of the bottom surface of the box and a bottom surface forming direction of the box. The air blowing is a bag mounting method in which the central air nozzle is started earlier.

[0008]

From the upper side of the bag covered with the mouth in the empty box, the central nozzle first starts blowing air, and then the pair of air nozzles at both ends starts blowing air.

[0009]

Embodiments of the present invention will now be described with reference to FIGS. FIG. 1 is a plan view showing the arrangement of air nozzle groups on the bottom surface of an empty box. That is, the bottom of the empty box 25 has a rectangular shape. The air nozzle group faces the direction perpendicular to the bottom surface. The rectangular bottom has a long side dimension L ₁ of 400 mm and a short side dimension L ₂ of 250 mm. Also, a pair of air nozzles 2 are provided at both ends of the rectangular end face in the longitudinal direction.
9 are arranged. The distance L ₃ between each pair of air nozzles 29 is 315 mm. The distance between the pair of air nozzles 29 is 45 mm in the short side direction. Further, a pair of air nozzles 33 is arranged at the center in the longitudinal direction. The mutual distance L ₅ between the pair of air nozzles 33 is 20 mm in the long side direction. The inner diameter of all nozzles is 4 mm.

Then, as shown in FIG. 2, immediately after the start of air blowing from the central air nozzle 33, that is, after a delay of t seconds (t = 0.1 seconds), the two pairs of air nozzles at both ends blow air. The total time T of blowing air from the central air nozzle is 0.5 seconds, and the blowing time of air from the air nozzles at both ends is 0.4 seconds. As described above, the central air nozzle 3
By sequentially blowing air from 3 to the air nozzles 29 at both ends, the bag 17 is attached to the bottom surface of the box 25 so as to be in close contact from the center toward the periphery.
It is possible to avoid the accumulation of air between 7 and the box 25. As a result, it was possible to prevent the slack 31 from being generated in the bag as in the conventional case (FIG. 3).

It is not always necessary to provide one pair of central air nozzles 33, and one or three or more may be provided. Further, in the embodiment of the present application, the empty box is rectangular, but not limited to this,
It may have a box shape such as a square, an ellipse, a circle, and a polygon.

[0012]

As is apparent from the above description, in the bag mounting method according to the present invention, not only one pair of air nozzles are arranged at both ends in the forming direction of the bottom surface of the box, but also at the center in the longitudinal direction. Also, by arranging an air nozzle and starting the blowing of air from this center air nozzle quickly, the bag can be attached from the center of the bottom surface to the outer periphery, and the air accumulation between the bag and the bottom surface of the box. Therefore, since it is possible to prevent the sagging of the bag from occurring in the center unlike the conventional case, the bag can be attached to the inner surface of the bottom of the box and the inner surface of the side wall and can be kept folded back to the outside of the box. Items can be easily stored in a bag inside the box.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of air nozzle groups used in a bag mounting method according to an embodiment of the present invention with respect to a bottom surface of a box.

FIG. 2 is a diagram showing the timing of blowing air from the air nozzle of FIG.

FIG. 3 is a vertical cross-sectional view showing a state in which the bag is attached to the empty box without slack according to this embodiment.

FIG. 4 is a schematic side view of an entire conventional automatic device for mounting a bag on the inner surface of an empty box.

FIG. 5 is a diagram showing problems that the bag mounting method adopted in the automatic device of FIG. 4 may have.

[Explanation of symbols]

 1 roll 3 film 7 tension bar 11 first chuck 13 first chain 15 seal / cut device 19 suction pad 21 second chuck 25 box 27 air blower device 29, 33 air nozzle 31 slack

Claims (1)

[Claims] 1. An opening edge of a bag made of a thin film is spread downward while being lowered from above an empty box that opens upward, and air is directed from above the bag into the empty box by an air blower device. When the bag is blown in, the bag is turned inside out to be put on the inner surface of the empty box, and in the bag mounting method in which the bag is folded back to the outside, the air blower device includes an air nozzle group that is oriented at a right angle to the bottom surface of the empty box. The air nozzle group includes a pair of air nozzles arranged at both ends of the bottom surface of the box in the forming direction and an air nozzle arranged at the center of the bottom surface forming direction of the box. How to put the bag on quickly.