JPH0977015A - Device for gathering packaging film in packaging machine for spherical object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an object to be packaged in a substantially square packaging film in good trim and with regularity in the gathering by providing under a throw-in hole four elastic bars in a cross in plan with each extended from the periphery halfway toward the center. SOLUTION: Under a throw-in hole 1 formed in a top plate 2 there are provided four elastic bars 6 which are capable of restitution to a horizontal position and each of which extends halfway toward the center O1 and obliquely at angles of about 45 deg. to the diagonals of a film F. When the film F is spread on the top plate 2 and a spherical object is dropped into the throw-in hole 1, the respective tips 6a of the four elastic bars 6 come into contact in a bent state with the underside of the film F in four directions and the film is attached tightly by friction to the outside surface of the spherical object. With further fall of the spherical object, the four elastic bars 6 recover their horizontal position and press the upper side of the film F toward the center. The parts of the film bent in four directions in this manner are gathered up tightly and made to adhere together by use of a heater. Then by cutting the film a neat package free of an opening in the gathering is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film squeezing device for a spherical packaging machine for packaging spherical vegetables such as lettuce and spherical fruits such as pomelo with a film.

[0002]

2. Description of the Related Art Conventionally, a substantially square film is placed on a top plate having an input port so that the center of the input port and the center of the film are substantially aligned with each other. A spherical object package that can be dropped onto a pedestal that moves up and down while passing through the input port, and can also be cut by a heater that has narrowed down the peripheral edge side of the film that is the upper side of the spherical object with a narrowing mechanism. In the machine
As seen in Japanese Patent Application No. 6-195223 filed by the present applicant, a charging sheet made of rubber or synthetic resin having a central hole and radial slits is provided below the charging port. There is.

[0003]

However, when the film dropped from the charging port together with the spherical object passes through the charging sheet, the charging sheet squeezes the entire periphery of the film at random without regularity. In that case, the entire peripheral side of the film becomes wrinkled, and it becomes difficult for the film to adhere to the spherical object due to friction, after which it is further narrowed down by the narrowing mechanism and cut by the heater. And the peripheral edge side, which is longer than the center of the diagonal side of the film, is packaged in a so-called sleeve-opening state, which results in packaging failure that can not be packaged cleanly, and the center hole of the input sheet and the radial direction. Since the size of the slit is limited, spheres larger than the prescribed size cannot be packaged. It was.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves such a problem and makes it possible to effectively package spherical objects while squeezing them well by providing regularity to the packaging film. Place a substantially square film on the top plate having a center so that the center and the center of the input port are substantially aligned, and move the spherical object together with the film from above the center of the film up and down while passing through the input port. In the spherical object packaging machine capable of cutting and packaging the peripheral side of the film, which is the upper side of the spherical object, with a heater that is narrowed down by a narrowing mechanism, while dropping it onto the cradle. In the downward direction, the bases of the four elastic bars that extend to the midpoint where the tips approach the center of the insertion port and can be restored to the horizontal posture are fixed, respectively, and the flaps of each of the four elastic bars are fixed. And flat inclined at approximately 45 degrees to the diagonal of Lum is constructed by arranged in a plan view cross-shaped so as to extend.

[0005]

Therefore, while the central portion of the film on which the spherical object is placed is dropped into the feeding port and placed on the pedestal below it, the tips of the four elastic bars are shorter from the center to the peripheral portion. While bending and contacting the lower surface of the film in four directions, the film surface in the four directions can be pressed so as to be brought into close contact with the outer surface of the spherical object by friction. When the spherical object is restored to the horizontal posture in the upper direction and the film surface is pressed to the center side as it is, the four peripheral edges of the film, which are longer than the center on both diagonal sides, hit the elastic bar. Without it, the spherical object will bend away from the outer surface,
Immediately after that, the bent portion can be regularly bonded and cut by the heater while the squeezing mechanism squeezes strongly with regularity, so that so-called sleeve opening does not occur and clean packaging can be performed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A circular charging port 1 having a diameter larger than that of a spherical object W is formed at the center of a top plate 2 of the spherical object packaging machine shown in FIGS. A roll R of the film F is placed on the top of the top plate 2, and an upper and lower clamp capable of gripping one end side of the film F and deploying the film F from the roll R onto the top plate 2 above the top plate 2. Nail 7a,
7a and a deployment mechanism 7 having a fan portion 7b capable of blowing air downwardly of the charging port 1 is reciprocally provided and disposed at a portion above the top plate 2 and approaching the roll R. The center O _{2 of the} film F that is spread on the top plate 2 by the spreading mechanism 7 is the center O of the input port 1.
_A cutting mechanism 8 capable of cutting in a substantially regular square shape substantially in conformity with ₁ is provided to have the same structure as the conventional structure.

In addition, a narrowing mechanism 4 having both upper shutters 4a, 4a and both lower shutters 4b, 4b is provided in the upper direction of the vertically moving cradle 3 and in the lower direction of the inlet 1, and both Upper shutters 4a, 4a and both lower shutters 4
A heater 5 having a pair of heaters 5a and 5b is provided between b and 4b, and a discharge port 9 for the film residue Fa is provided at the end of the machine body to have the same structure as the conventional structure.

As shown in FIGS. 3 and 4, in the downward direction around the inlet 1, a rounded tip 6a is provided.
The bases 6b of the four elastic bars 6 having elasticity that can extend back to the center O ₁ of the film F and have the elasticity capable of being restored to the horizontal posture, and the four elastic bars 6 are formed on the diagonal line of the film F. A and A are arranged in a cross shape in a plan view so as to overlap and extend on both straight lines B and B which are inclined by about 45 degrees with respect to A.

Therefore, as shown in FIGS. 2 and 5, the film F is unfolded on the top plate 2 and the pedestal 3 is moved up to the highest position as indicated by the phantom line B, and the film F is moved upward. When the spherical object W is dropped onto the center O _{2 of} the film, as shown in FIG.
The tips 6a of the four elastic bars 6 are placed on the lower surface of the film F in the four directions in the direction of the straight line B in which the length from the center O ₂ to the peripheral edge is shortened while being dropped onto the pedestal 3 below. While bending and contacting, the film F surface in the four directions can be pressed against the outer surface of the spherical object W so as to be in close contact with the outer surface of the spherical object W by friction. When it is slightly lowered, as shown in FIGS. 7 and 8, the four elastic bars 6 are restored to the horizontal posture in the upward direction of the spherical object W, and the film F surface is pressed to the center side as it is. In this state, the four peripheral edges of the film F, which are longer than the center O ₂ on both sides of the diagonal lines A and A, do not contact the elastic bars 6 as shown by C, and the adjacent elastic bars 6 and 6 do not contact each other. Bending away from the outer surface of the spherical object W become.

Immediately after that, as shown in FIG. 9, the diaphragm mechanism 4 can strongly narrow the portion bent in the four directions with regularity, and then, as shown in FIG. Since it can be adhered and cut, it can be packaged cleanly without causing so-called sleeve opening, and since it has such a structure, it is possible to package even larger spherical objects.

[0011]

As described above, according to the present invention, while the center portion of the film F on which the spherical object W is placed is dropped into the inlet 1 and placed on the pedestal 3 below it, four elastic bars are provided. The tip 6a of 6 bends and contacts the lower surface of the film F in four directions, which becomes shorter from the center O ₂ to the peripheral edge portion, and frictionally adheres the film F surface in the four directions to the outer surface of the spherical object W. After that, the four elastic bars 6 are restored to the horizontal posture in the upward direction of the spherical object W, and the film F surface is pressed to the center side as it is. Center O on the side of diagonal A, A
The four-direction peripheral edge of the film F, which is longer than _2, does not hit the elastic bar 6 and is in a state of being bent away from the outer surface of the spherical object W. Immediately after that, the bent portion is narrowed down by the narrowing mechanism 4 It is possible to cut and bond with the heater 5 in an orderly manner while strongly squeezing it with regularity, and it is possible to perform clean packaging so that so-called sleeve opening does not occur at the cut portion as in the conventional case. It has a feature that it can be suitably implemented with a simple structure in which four elastic bars 6 are attached to the mouth 11.

[Brief description of drawings]

FIG. 1 is a perspective view showing a spherical object packaging machine.

FIG. 2 is a cross-sectional view showing a part of a spherical object packaging machine.

3 is a plan view showing a part of FIG. 1. FIG.

FIG. 4 is a plan view showing a film and an input port.

FIG. 5 is a cross-sectional view showing a part of FIG.

FIG. 6 is an operation explanatory view showing the operation state of FIG. 5;

FIG. 7 is an operation explanatory view showing an operation state of FIG. 6;

8 is a plan view showing the top surface of FIG. 7. FIG.

FIG. 9 is an operation explanatory view showing an operation state of FIG. 7;

FIG. 10 is an operation explanatory view showing the operation state of FIG. 9;

[Explanation of symbols]

1 Input Port 2 Top Plate O _1, O ₂ Center F Film W Spherical 3 Cradle 4 Narrowing Mechanism 5 Heater 6 Elastic Bar 6a Tip 6b Base

Claims (1)

[Claims] 1. A substantially regular quadrangular film F is placed on a top plate 2 having an input port 1 such that the center O ₁ and the center O ₂ of the input port 1 are substantially coincident with each other, and the center O of the film F is placed. While dropping the spherical object W together with the film F from above ₂ onto the vertically moving pedestal 3 while passing through the feeding port 1, the peripheral side of the film F, which is the upper side of the spherical object W, is narrowed down. In a spherical object packaging machine that can be cut and wrapped by the heater 5 that has been narrowed down by the above, in the downward direction around the input port 1, the tip 6a extends to an intermediate position approaching the center O ₁ of the input port 1. The bases 6b of the four elastic bars 6 that can be restored to the horizontal posture by
A packaging film squeezing device, which is arranged in a cross shape in plan view so as to extend so as to be inclined at about 45 degrees with respect to the diagonal lines A, A of the film F of each elastic bar 6 of the book. .