JPH042490A - Cutting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, ginnies, soft drinks, jams, dried foods, etc., and are rigid containers with particularly excellent sealing and preservation functions. However, metal cans have the following points to be improved. That is, (1) Since it is a metal can, there is a limit to its weight reduction.

■ If it is crushed by an impact, it will not recover and will be deformed.

■ Compared to plastic containers, the energy cost for manufacturing them is high.

■ 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,
Containers with metal lids have 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. The method used is to reduce the thickness of the flange (sheet forming), then cut the flange 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.

(Problems to be Solved by the Invention) As mentioned above, when manufacturing a plastic container body, in order to obtain a highly accurate container with a metal lid by properly seaming the periphery of the metal lid, 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, when cutting the outer periphery of the flange portion, the container body is repeatedly mounted on a guide fixed to the upper part of the male cutting die, and in this state, cutting is performed between the male cutting die and the female cutting die. After the cutting is completed, the container body is separated from the guide by blowing air through a communication pipe provided in the guide.

However, since the above-mentioned guide fixes the container main body in a predetermined position, the attachment state between the guide and the container main body is relatively rigid. For this reason, the container body may not be separated from the guide even by air blowing after cutting, and in this case, there is a problem that the newly cut container body cannot be attached to the guide.

The present invention has been made in consideration of these points,
To provide a cutting device capable of reliably separating a container body from a guide after cutting and performing a quick and reliable cutting operation.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a method for placing a plastic container body having a flange portion in an inverted state, and a cutting male mold that is supported by a cutting table and moves in the vertical direction. A cutting female mold is disposed above the mold and stores the cut container body therein, and a guide is fixed to the upper part of the cutting male mold and installed inside the container body, and the cutting table is set at a predetermined height. A cylinder space is provided inside the cylinder space and extends in the vertical direction, and a piston is slidably provided in the cylinder space, and the piston has a cylinder space that extends upwardly by passing through the cutting table, the male cutting die, and the guide. This is a cutting device characterized by a fixed extending protrusion rod.

(Function) According to the present invention, after the flange portion is cut between the male cutting die and the female cutting die, the piston is moved upward and the container body is pushed up by the protruding rod, thereby lifting the container body from the guide. It can be pulled apart and reliably stored in the cutting female mold.

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

FIG. 1 is a diagram showing an embodiment of a cutting device according to the present invention, and FIG. 2 is a side view of the entire press cutting device in which the cutting device is incorporated.

First, the entire press cutting apparatus will be explained with reference to FIG. In FIG. 2, the 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. 2, 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 23g 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. 1). The guides 25, 26, 27 have shapes corresponding to the body 47 and bottom 48 of the container body 45 shown in FIG. 1, and are used to fix the container body 45 in a predetermined position.

Furthermore, as shown in FIG. 2, on the right side of the upper fixing 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 stage 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 cut female die 23b having an open top, 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 FIG.

The male cutting die 23a of the cutting device 23 is connected to the intermediate bed 13.
A guide 27 is attached to the male cutting die 23a via a cutting table 41. Cut male die 23a
The cut female die 23b is the flange portion 4 of the container body 45.
6. The width of the flange portion 46 is set to a predetermined width by cutting the outer periphery of the flange portion 46.

Further, on the outer periphery of the cutting table 41, an ejector 40 is provided so as to be able to freely slide in the vertical direction for pushing up the cutting residue 46a of the cut flange portion 46 and separating it from the male cutting die 23a. Furthermore, a plurality of holders 44 that hold the container body 45 with the flange portion 46 cut out are attached to the lower end 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.

Further, as shown in FIG. 1, a conveying device 17 that moves in a direction perpendicular to the bottom surface is disposed between the male cutting die 23a and the female cutting die 23b. The conveying device 17 has a pair of grips 50 that are movable in the radial direction (left and right directions in FIG. 1), and are adapted to press and hold the container body 45 from the sides. The ejector 40 has a cylindrical shape, and has a protrusion 40a that protrudes outward at its upper part.
is provided. A plurality of protrusions 40a are provided at predetermined intervals in the circumferential direction. This protrusion 40a
This is to separate the cut residue 46a formed into a cylindrical shape by the thrust of the ejector 40 from the male cutting die 23a.

The grip 50 also has a notch 5 corresponding to the protrusion 40a.
0a is formed, and when the male cutting die 23a descends, the protrusion 40a enters the notch 50a of the grip 50, and only the cut dregs 46a are placed on the grip 50.

Further, as shown in FIG. 1, a support stand 64 is fixed on the intermediate bed 13, and a cutting stand 41 holding the male cut die 23a is also fixed on the support stand 64. The cutting table 41 has a male cutting die 23a and an outer diameter of a joint.
The cutting table 41 corresponds to the vertical movement stroke of the intermediate bed 13, and has a predetermined height between this stroke and the turning rotation.

Further, a cylinder space 5 extending vertically in the cutting table 41 is provided.
1 is formed, and a piston 55 that is movable in the vertical direction is disposed within this cylinder space 51. Furthermore, a protruding rod 58 that extends upwardly through the cutting table 41, the male mold 23a1, and the guide 27 is disposed on the upper part of the piston 55.
5 is integrally fixed.

Further, a spring 60 is disposed in the cylinder space 51a above the piston 55 to bias the piston 55 downward.

Further, a vacuum pipe 61 is provided passing through the cutting table 41, the male cutting die 23a1, and the guide 27, and this vacuum pipe 61 is opened at the upper end of the guide 27. Further, the support base 64 includes a cylinder space 51b below the piston 55.
An air supply pipe 63 for supplying air for driving the piston 55 is provided inside.

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 is raised to the upper position through the intermediate 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. After that, the intermediate bed 13 is further lowered to a lower position,
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 main body 45 held by the grips 50 of the transport device 17 is attached to the guide 27 and fixed, and at the same time, the pair of grips 50 of the transport device 17 are opened.

In this case, the inside of the container body 45 is evacuated by the vacuum pipe 61 opening at the upper end of the guide 27, and the container body 45 is tightly attached to the guide 27 and fixed at an accurate position.

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.

In this state (with the intermediate bed 13 in the upper position!), air is supplied from the air supply pipe 63 into the cylinder space 51b, and the piston 51 moves upward against the force of the spring 60. The container body 45 is mechanically pushed upward by a protruding rod 58 provided at the upper part of the piston 55, and the container body 45 enters the cutting female mold 23b and is held by the holder 44.

Then, the container main body 45 that has entered the cutting female mold 2Bb is sequentially sent upward by the next container main body 45 that newly enters the cutting female mold 23b, and the upper opening (not shown) of the cutting female mold 23b is opened. The liquid is then discharged to the outside through the discharge pipe 29.

Thereafter, while the intermediate bed 13 descends from the upper position to the lower position via the intermediate position, the cut residue 46a remaining on the outer periphery of the male cutting die 23a is pushed upward by the ejector 40 and placed on the grip 50, and then It is discharged to the outside by the transport device 17.

As described above, according to this embodiment, by evacuating the inside of the container body 45 using the vacuum piping 61, the container body 45 can be evacuated.
is brought into close contact with the guide 27 and fixed at an accurate position, so that the outer periphery of the flange portion 46 of the container body 45 can be cut with high precision. Further, after the cutting operation is completed, by supplying air into the cylinder space 51b, the container body 45 can be mechanically pushed up and inserted into the female cutting die 23b by the pushing rod 58. In this case, the cylinder space 51
As described above, since the cutting base 41 has a predetermined height, the length of the cylinder space can be increased, and the movement stroke of the piston 55 and the protruding rod 58 can be increased. By this, the container body 4
5 can penetrate deep into the cutting female die 23b and be reliably held by the holding body 44.

〔Effect of the invention〕

As explained above, according to the present invention, since the cylinder space is provided in the cutting table having a predetermined height, the movement stroke of the piston and the protruding rod is made large to allow the container body to penetrate deep into the cutting female mold. It can be stored.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of a cutting device according to the present invention, and FIG. 2 is a side view showing the entire press cutting device. 10... Press cutting device, 23... Cutting device,
23a...Cut male type, 23b...Cut female type, 2
7...Guide, 45...Plastic container body,
46...Flange part, 51...Cylinder space, 55
... Piston, 58 ... Protrusion rod, 60 ... Spring, 61 ... Vacuum piping, 63 ... Air supply pipe.

Claims (1)

[Scope of Claims] 1. A plastic container main body having a flange portion is placed in an inverted state, and a male cutting mold is supported on a cutting table and moves in the vertical direction, and a male cutting mold is placed above the male cutting mold. The cutter has a predetermined height and an inner cutter. A cylinder space is provided that extends in the vertical direction, and a piston is slidably provided in the cylinder space, and a protruding rod that extends upward through the cutting table, the male cutting die, and the guide is fixed to the piston. A cutting device that is characterized by: 2. The cutting device according to claim 1, wherein the cutting table has approximately the same height as the moving stroke of the male cutting die.