JPH042491A - Cutting device - Google Patents

Abstract

PURPOSE:To discharge a cut residue to the external part quickly and surely, by carrying out to the external part by a grip after thrusting the cut residue left on the cut male die outer periphery by the ejector having a pair of projections coming between the grips. CONSTITUTION:A cut residue 46a left on the cut male die 23a outer periphery is thrusted by the 1st projection 60 and 2nd projection 62 of an ejector 40, when the ejector 40 slides the male die 23a outer periphery upward, and placed on a step part 60a and the 2nd projection 62. At this time, a pair of grips 50 of a transfer device 17 become open. Thereafter, the grips 50 become closed, when the cutting male die 23a comes to the position of the transfer device 17 with an intermediate bed being descended to the intermediate position, a cutting male die 23b is descended by passing through the insides of a pair of the grips 50, the 1st projection 60 is also passed through the gap between the grips 50 and the 2nd projection 62 is passed through the notch 50a of the grip 50. On the other hand, the cut residue 46a stops on the grip 50 and is discharged to the external part by the transfer device 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cutting device for cutting a flange portion of a plastic container body used in a container with a metal lid.

(Prior Art) Metal containers, such as metal cans, have various shapes, but can be classified into three-piece cans and two-piece cans based on the structure of the can body. A three-piece can, also known as a tin solder can, has a cylindrical body, lid, and bottom sealed with double seams.

On the other hand, a two-piece can is also called a stamped tin can, and has a structure in which the body and bottom (container body) are integrally molded, and the lid is double-sealed.

These metal cans are used as food packaging containers for various canned foods, juices, soft drinks, jams, dried foods, etc., and are rigid containers with particularly excellent sealing and preservation functions. However, metal cans have some points that should be improved as described below. That is, (1) Since it is a metal can, there is a limit to its weight reduction.

■ When subjected to impact, if it is crushed, it will not be able to recover and will be deformed.

■ Compared to plastic containers, the energy cost of manufacturing them is higher.

■ If the display effect of the container exterior is made of metal, it cannot be changed freely, and the only means of exterior packaging is printing.

■ It is impossible to create transparent containers that allow the contents to be checked without opening the can.

In order to solve these drawbacks of conventional metal cans, a container with a metal lid has been developed in which the peripheral edge of a metal lid is wrapped around the flange of a plastic container body.

In addition, as a method for manufacturing plastic container bodies, a plastic sheet having the thickness necessary for container formation is heated using a general thermoforming method, and a mold is used to form a molded product of the container body with a flange. A method has been developed in which the thickness of the flange portion is reduced and the width of the flange portion is further cut to a predetermined width. The reason why the flange portion is press-cut in this way is to perform appropriate seaming and tightening between the flange portion and the peripheral edge portion of the metal lid.

(Issue 8 to be Solved by the Invention) As mentioned above, when manufacturing a plastic container body, it is necessary to properly seal the container with the peripheral edge of the metal lid to obtain a container with a metal lid with high precision. A method has been developed in which the flange portion of the container body is pressed to a predetermined thickness using a press device, and the outer periphery of the flange portion is cut to a predetermined width using a cutting device.

By the way, it is considered that the outer periphery of the flange portion is cut by a cutting device consisting of a male cutting die and a female cutting die. Further, this cutting operation generates cutting residue, and in order to perform the cutting operation quickly and accurately, it is necessary to quickly discharge the cutting residue to the outside.

The present invention has been made in consideration of these points,
To provide a cutting device capable of quickly and surely discharging cut waste to the outside after cutting a flange part of a plastic container body.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a male cut mold on which a plastic container body having a flange portion is placed in an inverted state, and a female cut mold disposed above the male cut mold. , a pair of grips for gripping and transporting the container body up to the male cut mold; and a pair of grips slidably disposed around the outer periphery of the male cut mold, protruding radially outward from the upper end and between the pair of grips. This cutting device is characterized by comprising: an ejector for ejecting cut scraps and having a pair of first protrusions that enter into the cut scraps.

(Function) After the cutting operation is completed, the ejector slides upward on the outer periphery of the male cut mold, and the cut particles remaining on the outer periphery of the male cut mold are pushed up by the first protrusion and separated from the male cut mold. This cut piece is transported outside by a pair of grips.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4 are views showing one embodiment of a cutting device according to the present invention, and FIG. 5 is a side view of the entire press cutting device in which the cutting device is incorporated.

First, the entire press cutting device will be explained with reference to FIG. In FIG. 5, a press cutting device 10 is provided on a base 11 via a crank mechanism 12, and includes an intermediate bed 13 that reciprocates in the vertical direction. This intermediate bed 13 has three positions: an upper position, an intermediate position, and a lower position. Also, intermediate bet 1
An upper fixing base 15 is disposed above 3.

Further, as shown in FIG. 5, a male press die 21a is provided on the upper right side of the intermediate bed 13, and a female press die 21b is provided in the lower part of the upper fixing table 15 in correspondence with the male press die 21a. Press male die 21a and press female die 21
A press device 21 is formed by b. On the other hand, a male cutting die 23a is provided on the upper left side of the intermediate bed 13, and a female cutting die 23b is provided at the lower part of the upper fixing base 15 in correspondence with the male cutting die 23a.
A cutting device 23 is formed by the cutting female mold 3a and the cutting female die 23b. Furthermore, a cooling stand 22 is provided at the center of the upper part of the intermediate bed 13.

In addition, a plastic container body 45 (
A guide 25, 26, 27 is provided which is mounted within the guide (FIG. 4). The guides 25, 26, 27 have shapes corresponding to the body 47 and bottom 48 of the container body 45 shown in FIG. 4, and are used to fix the container body 45 in a predetermined position.

Furthermore, as shown in FIG. 5, on the right side of the upper fixed base 15,
A supply pipe 28 for supplying the container body 45 is provided, and a supply stand 30 is provided on the intermediate bed 13 in correspondence with the supply pipe 28. This supply pipe 28 supplies a container body 45 molded from a plastic sheet by a general thermoforming method to the supply table 30. Also, the upper fixed base 15
A discharge pipe 29 for discharging the container body 45 is provided at the upper left side of the container body 45 . The discharge pipe 29 communicates with the upper end opening 54 of the cut female die 23b and discharges the cut container body 45 to the outside.

Between the intermediate bed 13 and the upper fixing table 15, the container body 45 is transferred from the supply table 30 to the press male die 21 of the press device 21.
a1 cooling stand 22 and cutting male mold 2 of cutting device 23
A conveying device 17 is provided for sequentially conveying in the horizontal direction up to 3a.

Note that the base 11, crank mechanism 12, and intermediate bed 13 are covered as a whole with a cover 16.

Next, the cutting device 23 will be explained with reference to FIGS. 1 to 4.

As shown in FIG. 4, the male cutting die 23 of the cutting device 23
a is provided on the intermediate bed 13 via a cutting table 41, and a guide 27 is attached on the male cutting die 23a. The male cutting die 23a and the female cutting die 23b cut the outer periphery of the flange portion 46 of the container body 45 to form the flange portion 4.
6 is set as a predetermined width.

Further, the cut dregs 46a of the cut flange portion 46 are pushed up on the outer periphery of the cut male die 23a.
An ejector 40 is provided to be slidable in the axial direction for separating the ejector 40 from the a. Furthermore, a plurality of holders 44 for holding container bodies 45 are attached to the lower part of the inner surface of the cut female mold 23b facing upward. This holder 44 is made of an elastic body such as a hanging string, and can be passed through above the container body 45.

In addition, as shown in FIGS. 3 and 4, the cut male die 2
A conveying device 17 for conveying the container body 45 is disposed between the cutting female mold 3a and the cutting female die 23b.
7 has a pair of grips 50 that are movable in the radial direction (in the left and right directions in FIGS. 3 and 4), and are configured to press and hold the container body 45 from the sides.

Moreover, as shown in FIGS. 2 and 3, the ejector 4
0 has a cylindrical shape, and a first protrusion 60 that protrudes radially outward is provided at the upper end. This first
A plurality of protrusions 60, for example two, are provided at predetermined intervals in the circumferential direction.

The first protruding portion 60 removes the cutting residue 46a formed into a cylindrical shape by pushing up the ejector 40 from the male die 23a.
It is separated from the body and lifted upward. In addition, the first
The protrusion 60 is disposed between the pair of grips 50 and is configured to fit into the gap between the pair of grips 50.

Further, as shown in FIGS. 1 to 3, an ejector 40
A plurality of protruding plates 61, for example two protruding plates 61 extending in the axial direction (longitudinal direction) of the ejector 40, are fixed to the outer circumferential surface of the ejector 40 at circumferential positions different from the disposed positions of the first protruding parts 60.

This projecting plate 61 is provided separately from the ejector 40,
It is attached to the outer periphery of the ejector 40 with bolts 63.

Further, the upper end of the protruding plate 61 extends at substantially the same height as the first protruding portion 60, and the upper end of the protruding plate 61 is bent radially outward to form the second protruding portion 62.

That is, the first protruding part 60 and the second protruding part 62 are each provided as a pair, and are arranged circumferentially offset by 90'' (FIG. 3). 6
2 is placed on the path-plane.

In addition, a notch 50a is formed in the pair of grips 50 corresponding to the second protrusion 62, and when the male cutting die 23a descends, the second protrusion 62 passes through the notch 50a of the grip 50, and the cut scraps are removed. Only 46a is placed on the grip 50.

Next, the operation of this embodiment having such a configuration will be explained.

First, a plastic sheet having a thickness necessary for forming a container is heated in advance by a general thermoforming method, and a container body 45 having a flange portion 46 is formed using a mold.

Subsequently, this container body 45 is transferred to the supply stand 3 via the supply pipe 28.
0, the intermediate bed 13 is placed at an intermediate position, and the container body 45 is gripped by the grip 50 of the conveying device 17. Subsequently, the intermediate bed 13 is lowered to the lower position, and the container body 45 is transported by the transport device 17 to above the male press die 21a.

Subsequently, the intermediate bed 13 moves up through the intermediate position to the upper position, and the guide 25 is installed inside the container body 45, and the container body 45 is fixed by this guide 25. Subsequently, the female press die 21b is lowered slightly by hydraulic pressure, and the male press die 21a is inserted into the female press die 21b. The flange portion 46 of the container body 45 is then pressed between these, and the thickness of the flange portion 46 is adjusted to a predetermined thickness.

Subsequently, the intermediate bed 13 is lowered to the intermediate position, and the container body 45 is gripped by the grip 50 of the conveying device 17.
The container body 45 is transported by the transport device 17 to the top of the cooling table 22, where it is cooled.

Subsequently, with the intermediate bed 13 in the intermediate position, the container body 45 is gripped again by the grip 50 of the conveying device 17. Thereafter, the intermediate bed 13 is lowered to the lower position, and the container body 45 is transported by the transport device 17 from the cooling stand 22 to above the male cut mold 23a.

Next, the operation of the cutting device will be explained in detail.

When the container body 45 is transported by the transport device 17 to above the male cutting die 23a, the intermediate bed 13 is raised from the lower position to the intermediate position. When the intermediate bed 13 rises to the intermediate position, the container body 45 gripped by the grip 50 of the conveying device 17 is attached to the guide 27 and fixed.
At the same time, the pair of grips 50 of the transport device 17 are opened.

Thereafter, while the intermediate bed 13 rises from the intermediate position to the upper position, the outer periphery of the flange portion 46 of the container body 45 is cut between the male cutting die 23a and the female cutting die 23b, and in this way, the width of the flange portion 46 is cut. is adjusted to a predetermined width. During this time, since the guide 27 is provided with the vacuum hole 56, the container main body 45 is brought into close contact with the guide 27 and fixed at an accurate position, making it possible to perform accurate cutting.

The container main body 45 whose width of the flange portion 46 has been adjusted by the cutting device 23 in this manner is pressed by the male cutting die 23a and enters the female cutting die 23b, and is held by the holder 44. As shown in FIG. 4, the container body 45 that has entered this female cut mold 2Bb is transferred to the upper end opening 5 of the next container body 23b that newly enters the female cut mold 23b.
4 and is discharged to the outside via a discharge pipe 29.

Next, while the intermediate bed 13 is lowered from the upper position, the ejector 40 slides upward on the outer periphery of the male cutting die 23a. As a result, cut residue 4 remaining on the outer periphery of the cutting male die 23a
6a is pushed up by the first protrusion 60 and second protrusion 62 of the ejector 40 and separated from the male cutting die 23a. The cut scraps 46a separated from the male cutting die 23a are removed from the stepped portion 60a of the first protrusion 60 and the second
It is placed on the protrusion 62. At this time, the pair of grips 50 of the transport device 17 are open (separated from each other).

After that, when the intermediate bed 13 is lowered to the intermediate position and the male cutting die 23a reaches the position of the conveying device 17, the pair of grips 50 of the conveying device 17 are closed, and the male cutting die 23a is closed.
b descends through the inside of the pair of grips 50. When the male cutting die 23a descends inside the pair of grips 50, the first protrusion 60 of the ejector 40 moves inside the pair of grips 5.
0, and the second protrusion 62 passes through the notch 50a of the pair of grips 50. On the other hand, the cut scraps 46a on the first protrusion 60 and the second protrusion 62 stop on the pair of grips 50. Next, in this state, cut scraps 4
6a is discharged to the outside by the conveyance device 17.

As described above, according to this embodiment, the outer periphery of the flange portion 46 of the container body 45 can be accurately cut by the cutting device 23. In addition, the cut residue 46g remaining on the outer periphery of the male cutting die 23a is pushed up by the pair of first protruding parts 60 and the pair of second protruding parts 62 which are arranged 90 degrees apart from each other, so that the cut residue 46a is tilted. It allows you to push up with good balance while maintaining your horizontal position. Therefore, the cut residue 46a can be placed at predetermined positions on the stepped portion 60a of the first protrusion 60 and the second protrusion 62, and thereby can be reliably discharged to the outside by the conveyance device 17. Furthermore, the second protrusion 6
2 is attached to the ejector 40 with bolts 63, so that the attachment of the projecting plate 61 can be carried out easily.

〔Effect of the invention〕

As explained above, according to the present invention, after the cutting operation is completed, the ejector slides upward on the outer periphery of the male cutting die, so that the cut remaining on the outer periphery of the male cutting die is pushed up by the first protruding part and cut. Separated from the male mold. Therefore, the cut scraps separated from the male cutting mold can be quickly and reliably discharged to the outside by the pair of grips.

[Brief explanation of drawings]

FIG. 1 is a side view showing the ejector portion of the cutting device according to the present invention, FIG. 2 is a side view in the direction of the ■ line in FIG. 1, FIG. 3 is a plan view of the ejector portion, and FIG. is a side view of the cutting device, and FIG. 5 is a side view showing the entire press cutting device. 10... Press cutting device, 17... Conveying device, 2
1...Press device, 23...Cut device, 23a.
...Cut male type, 23b...Cut female type, 27...
Guide, 40... Ejector, 45... Plastic container body, 46... Flange portion, 50... Pair of grips, 60... First protruding portion, 61... Projection plate, 62 ...Second protrusion. Figure 1

Claims (1)

[Scope of Claims] 1. A male cut mold on which a plastic container body having a flange portion is placed in an inverted state; a female cut mold disposed above the male cut mold; a pair of grips for gripping and transporting the male cut die, and a pair of grips slidably disposed on the outer periphery of the male cut die, projecting outward in the radial direction from the upper end and entering between the pair of grips. A cutting device comprising: an ejector for ejecting cut scraps having one protrusion. 2. A pair of protrusion plates extending in the longitudinal direction are fixed to the outer peripheral surface of the ejector at a circumferential position different from that of the first protrusion, and the upper ends of the protrusion plates are extended to the first protrusion. 2. The cutting device according to claim 1, wherein the upper end of the projecting plate is bent radially outward to form a second projecting portion, and a notch is formed in the pair of grips to allow the second projecting portion to pass through.