JPH06247456A - Apparatus for forming axial slit for breaking non-opening guarantee ring of plastic screw cap - Google Patents

Abstract

(57) [Summary] [Purpose] Between the retaining means inside the unopened assurance ring of the plastic screw cap so that the unopened assurance ring can be crushed and removed when the plastic screw cap is removed by twisting. An apparatus for forming an axial slit is provided. [Structure] A plastic screw cap 1 is eccentrically arranged on an upper portion of a mandrel 22, and the peripheral walls of a cup-shaped portion 2 and an unopened assurance ring 3 are pressed against a peripheral surface of an arc of a receiving portion 11 and are fitted along the peripheral surface. The screw cap 1 made of plastic is moved while being rotated by the engagement of the teeth 9 serving as a holding means and the pulling peripheral teeth 30, and the unopened assurance ring is formed by the cutting end of the blade 18 which is concentrically attached to the peripheral surface of the receiving portion 11. A circumferential slit for separating 3 is formed, and an axial slit for crushing the unopened stopper guarantee ring 3 is formed by a chisel 21 arranged at a right angle to the blade 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming an axial slit for crushing in an unopened guarantee ring of a plastic screw cap (screw cap; screw cap).

[0002]

Plastic screw caps are commonly known for closing containers. Such a cap consists of a cup-shaped part with an internal thread inside so that it can be screwed into the threaded part of the neck of the bottle,
An unopened guarantee ring is detachably attached to the lower end of the cup-shaped portion by a plurality of narrow bridging portions separated from each other by circumferential slits.

Inside the unopened assurance ring, holding means such as a plurality of teeth or elastic tabs are provided equiangularly, and these holding means are formed on the outside of the neck of the bottle by a collar portion ( (Ring) is projected inward so as to engage with the lower side.

According to the above structure, when the cap is twisted and removed from the container, the unopened assurance ring is retained by engaging with the collar portion, so that the unopened assurance ring is along the crush line by the circumferential slit. Is separated from the cup-shaped part and remains attached to the container. This kind of cap is
For example, US Pat. No. 4,343,754.

On the other hand, as a metal screw cap, it is known that a plurality of axial slits are formed in an unopened stopper ring, and when this type of metal screw cap is twisted and removed, the axial slit causes The unopened assurance ring can be removed from the container along with the cup-shaped portion while the unopened assurance ring is split and the edge of the cup-shaped portion remains attached.

[0006]

In the case of such a metallic screw cap, the unopened assurance ring can be engaged with the collar portion of the container by plastically deforming the unopened assurance ring. It is not necessary to provide a holding means such as a plastic screw cap, and the angular position of the axial slit attached to the unopened assurance ring can be arbitrarily determined, but in the case of a plastic screw cap, Since the axial slit must be formed while avoiding the position of the holding means, it is impossible to divert the method of arbitrarily determining the angular position of the axial slit, such as a metal screw cap, as it is.

However, recently, the tendency to recycle used containers has progressed, and even in the case of a container closed with a plastic screw cap, it is necessary to return it without the unopened guarantee ring attached to the neck. There is.

The technical object of the present invention is to hold the plastic screw cap inside the unopened assurance ring so that the unopened assurance ring can be crushed and removed when the plastic screw cap is unscrewed. It is to provide a device for forming an axial slit therebetween.

Within this aim, the object of the invention is to provide a device which is structurally simple and which can be easily adapted to caps of various shapes.

[0010]

According to the present invention, there is provided a cup-shaped portion and an unopened stopper guarantee ring detachably attached to the lower end of the cup-shaped portion by a plurality of bridging portions separated from each other by circumferential slits. And an axial slit for crushing is formed in the unopened assurance ring of the plastic screw cap in which a plurality of holding means for engaging with the collar portion of the container are formed at circumferentially equidistant positions inside the unopened assurance ring. A device, which is concentrically mounted to the receiving portion having a circular arc-shaped peripheral surface such that a cutting end projects from the peripheral surface, and a distance corresponding to a distance between the bridging portions. A blade having a plurality of notches formed therein, at least one chisel angularly arranged so as to be positioned between the notches adjacent to each other at right angles to the blade, and a rotation axis perpendicular to the plane of the blade. And eccentrically dispose the screw cap on the upper part, and while pressing the peripheral wall of the cup-shaped portion and the unopened assurance ring against the peripheral surface of the receiving portion, move the screw cap along the peripheral surface while rotating the screw cap. An integral mandrel with a mandrel to be obtained and a plurality of equiangularly spaced traction peripheral teeth having an edge portion in tangential contact with the cutting end of the blade and engaging with a part of the retaining means inside the unopened assurance ring. It is characterized in that it is constituted by a crown that is fitted on the outside.

The mandrel has a thread for screwing into a hollow shaft mounted on a carousel that rotates concentrically with the receiving part, and a shoulder for fixing the crown to the top of the hollow shaft. Preferably has a collar in tangential contact with the cutting edge on the same plane as the blade, and a plurality of recesses provided under the collar and forming traction teeth for engagement with the holding means.

Further, the crown includes a collar that is in tangential contact with the cutting edge on the same plane as the blade, and a plurality of teeth that protrude radially from below the collar and engage with a recess formed inside the unopened assurance ring. May be included.

Further, the chisel may have a recess in order to form a bridge across the axial slit of the unopened assurance ring.

It is also preferred that the mandrel top is constructed as a tongue which supports the screw cap such that the blade is located at a height between the cup-shaped portion of the screw cap and the unopened assurance ring. .

Further, a plurality of equidistantly spaced chisels may be provided in the uncapped assurance ring of the screw cap to form a plurality of equiangularly spaced axial slits.

Further, it is preferable to provide a notch at the cutting end of the blade so as to form a thicker bridging portion adjacent to the axial slit of the unopened stopper guarantee ring.

[0017]

Therefore, according to the present invention, the screw cap is eccentrically arranged on the upper part of the mandrel, and the cup-shaped portion and the peripheral wall of the unopened guarantee ring are pressed against the peripheral surface of the receiving portion, and the screw is moved along the peripheral surface. When the cap is rotated and moved by the engagement of the holding means and the pulling tooth, the cutting edge of the blade attached to the receiving part forms a circumferential slit for separating the unopened guarantee ring, and the chisel crushes the unopened guarantee ring. An axial slit for is formed.

At this time, if the rotational movement of the mandrel is synchronized with the circular movement along the peripheral surface of the receiving portion, the angular distance of the pulling tooth from the chisel at each contact position between the screw cap and the blade becomes different at each contact position. Since the angular distance from the chisel of the holding means that meshes with the pulling peripheral teeth is also fixed for each contact position, the two axially adjacent slits formed in the unopened assurance ring are always held. It becomes possible to form between means.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a plastic screw cap composed of a cup-shaped portion 2 formed by molding a plastic material and an unopened guarantee ring 3.

The cup-shaped portion 2 has an internal thread 4 for screwing into the neck of the container and an external knurled portion 5 for facilitating gripping. A disk-shaped gasket 6 is placed inside the cup-shaped part to tightly seal the mouth of the container.

The unopened guarantee ring 3 is detachably attached to the lower end of the cup-shaped portion 2 by a plurality of bridging portions 8 separated from each other by a circumferential slit 7.

A plurality of teeth 9, which are holding means for engaging with the collar portion of the container, are provided at equal intervals in the circumferential direction inside the unopened assurance ring 3, and the cap 1 is attached to the container. To be able to hold.

When the cap 1 is twisted and the container is removed and the container is opened, the unopened guarantee ring 3 remains attached to the container, and the bridging portion 8 is crushed by the axial component of the twisting and removing force, and the cup-shaped portion 2 The holding means can take various forms, such that they are separated.

When the container needs to be reused, when the cap 1 is twisted and removed, the unopened guarantee ring 3 is divided so that a part of the edge of the cup-shaped portion 2 remains attached. And the unopened assurance ring 3 together with the cup-shaped part 2 must be removable from the container.

In the device according to the invention, an axial slit 10 is formed axially through the unopened assurance ring 3 so that the axial slit 1 can be removed when the cap 1 is twisted off.
0 is divided and the axial slit 10
Between the two adjacent teeth 9 and intersect one of the circumferential slits 7 so that the remaining part remains attached to the cup-shaped part 2 at one bridging part, The bridging portion 8a adjacent to the direction slit 10 is made larger than (other bridging portions) so that the peripheral portion can be reliably separated at other locations.

2 to 4 show an example of this apparatus.
Receiving portions 11 having arcuate peripheral surfaces are stacked on each other and connected by screw means 14 and are cylindrical front surface portion 1
It is composed of two plates 12 and 13 respectively having 5 and 16 (see FIG. 4).

A cut end 19 is provided between the plates 12 and 13 so as to protrude from the front portions 15 and 16 by the same thickness as the unopened guarantee ring 3 and to be concentric with the front portions 15 and 16.
The blades 18 having the above are attached through the thin layer 17, the notches 20 are formed at the cutting ends 19 at equal intervals, and as will be described later, the blades 18 form the circumferential slits 7 of the cap 1. The circumferential slit 7 is formed by the notch 20.
A bridging portion 8 is formed between them.

Further, inside the lower plate 13, the blade 1
The chisel 21 which is at a right angle to the notch 8 and is positioned between the notches 20 adjacent to each other,
9 is equipped with a cutting end 21a corresponding to 9.

Further, a mandrel 22 is arranged outside the receiving portion 11, the mandrel 22 supports the cap 1 to be processed on the upper part thereof, and has a rotation axis perpendicular to the surface of the blade 18. I have it.

The mandrel 22 is mounted on a circular conveyor (not shown) that rotates in the direction A about the rotation axis and rotates concentrically with the front portions 15 and 16 of the receiving portion 11 so as to make a circular motion in the direction B. A required number of them are mounted, and in the illustrated example, the hollow shaft 26 is screwed into the female thread portion 27 of the hollow shaft 26 mounted on the carousel. It should be noted that any conventional motor means can be used to rotate the mandrel 22 and carousel.

A crown 23 is fitted onto each mandrel 22 so as to rotate integrally with each mandrel 22 via a key 24, and the crown 23 is mounted on the front surface portions 15 and 16 of the receiving portion 11. The rotational speed of the mandrel 22 and the circular motion speed of the carousel are selected so that they rotate at zero relative speed and both are synchronized.

Further, the crown 23 is a mandrel 22.
Is fixed in the axial direction between the shoulder (shoulder portion) 25 and the upper portion of the hollow shaft 26, and the crown 23
The edge, i.e., the collar 28, is in tangential contact with the cutting edge 19 flush with the blade 18.

A recess 29 is formed below the collar 28, and traction peripheral teeth 30 are formed at an angle inside the peripheral portion of the collar 28. The pulling tooth 30 is provided with a radial front surface portion 31 having a width larger than the height at which the tooth 9 as the holding means projects from the inner surface of the unopened assurance ring 3.

The operation of the device is as follows.

During the circular movement of the mandrel 22 in the B direction by the carousel, the mandrel 22 is separated from the receiving portion 11 in the opposite position where it does not face the front surfaces 15 and 16 of the receiving portion 11. The cap 1 is attached to the upper portion of the mandrel 22 located at such a position.

At this time, a tongue 32 (see FIG. 3) is formed on the upper part of the mandrel 22, and the tongue 32 has a height such that the cut end 19 is located between the cup-shaped portion 2 and the ring 3. .

Further, the mandrel 22 having the cap 1 attached to the upper portion thereof undergoes a circular motion in the B direction to cause the front portion 1 of the receiving portion 11 to move.
When moved to the side facing 5 and 16, the cap 1 moves in a direction away from the receiving portion 11 with respect to the mandrel 22 and becomes an eccentric state (see FIG. 4), and the cylindrical wall of the cup-shaped portion 2 becomes 12 is sandwiched between the front surface portion 15 of the dowel 12 and the surface of the tongue 32, while the unopened guarantee ring 3 is sandwiched between the front surface portion 16 of the lower plate 13 and the portion of the crown 23 having the traction circumferential teeth 30. Attached.

At this time, the cap 1 which has been co-rotated by the rotational movement of the mandrel 22 in the A direction is stopped for a moment by coming into contact with the blade 18, but immediately the mandrel 22 continues in the cap 1 in the A direction. By rotating, the pulling circumferential teeth 30 mesh with the teeth 9 that are holding means, so that the cap 1 rotates in conjunction with the mandrel 22.

Thus, the thrust force of the collar 28 of the crown 23 acts on the wall surface of the cap 1, and the cut end 19 of the blade 18 and the notch 20 cause the circumferential slit 7 and the bridging portion 8 to be formed.
Is formed.

Further, since the rotational movement of the mandrel 22 in the A direction is synchronized with the circular movement of the carousel in the B direction, the pulling tooth 30 from the chisel 21 at each contact position between the cap 1 and the blade 18 is increased. The angular distance of is fixed for each contact position, and the angular distance from the chisel 21 of the tooth 9 which is the holding means meshing with the pulling peripheral tooth 30 is also naturally fixed for each contact position. It is possible to form an axial slit 10 formed between the two teeth 9 that are adjacent to each other at all times, so that when the cap 1 is twisted and removed, the cap 1 is securely crushed so that the unopened assurance ring 3 is crushed. It can be processed.

The number and angular distance of the pulling circumferential teeth 30 of the mandrel 22 are such that when the cap 1 rotates on the blade 18, the pulling circumferential teeth 30 are meshed with the ring gears having inner teeth when the cap 1 rotates on the blade 18. Is important to ensure that it works in cooperation with the tooth 9 which is the holding means, so that when the cap 1 is mounted on the mandrel 22 it will The cap 1 can be reliably rotated even in the angular position.

Various modifications and variations can be made in the actual implementation of this device without departing from the spirit of the invention. In particular, after removing the mandrel 22, it is possible to replace the crown 23 with another crown having a number of teeth, a shape and an angular arrangement corresponding to the teeth 9 inside the unopened guarantee ring 3.

In order to form a bridging portion in the chisel 21, a concave portion 33 (see FIG. 2) is arranged laterally with respect to the axial slit 10 so that the unopened guarantee ring 3 is more firmly fixed before crushing. It is advantageous to fix it.

As another embodiment, in order to open the unopened guarantee ring 3 at a place where a plurality of angles are arranged, the ring 2 is opened.
It is also possible to have more than one chisel.

Therefore, according to the above-mentioned embodiment, when the screw cap 1 is twisted and removed, the unopened assurance ring 3 can be crushed and removed securely between the teeth 9 of the plastic screw cap 1. Axial slits 10 can be formed.

FIG. 5 shows a modification suitable for a plastic screw cap 1 having an inner recess 34 under the tooth 9 which is a holding means. In this modified example, the teeth 35 are radially projected from the lower peripheral portion of the collar 28 of the crown 23, and mesh with the inside of the recess 34 to move the cap 1.

[0048]

As described above, according to the device for forming the axial slit for crushing in the unopened cap guarantee ring of the plastic screw cap of the present invention, when the screw cap is twisted and removed, the unopened cap is opened. This has the great advantage of ensuring that an axial slit can be formed between the teeth of the plastic screw cap so that the security ring can be crushed and removed.

[Brief description of drawings]

1 is a cross-sectional view of a plastic screw cap with an unopened assurance ring.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a state in an operation stage after the state shown in FIG.

FIG. 4 is a plan view of this device taken along line IV-IV in FIG.

FIG. 5 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic screw cap 2 Cup-shaped part 3 Unopened guarantee ring 7 Circumferential slit 8 Bridging part 8a Bridging part 9 Teeth (holding means) 10 Axial slit 11 Receiving part 15 Front part (circumferential surface) 16 Front part (circumferential surface) ) 18 blades 19 cutting ends 20 notches 21 chisels 22 mandrels 23 crowns 25 shoulders (shoulders) 26 hollow shafts 27 screw threads 28 collars 29 recesses 30 traction peripheral teeth 32 tongues (tongues) 33 recesses 34 recesses 35 teeth

Front Page Continuation (72) Inventor Rodiero Arieri Italy (Province of Bologna) 40026 Imola Via Riverani 7

Claims (7)

[Claims] 1. A cup-shaped portion, and an unopened-guaranteed ring detachably attached to the lower end of the cup-shaped portion by a plurality of bridging portions separated from each other by circumferential slits. A device for forming an axial slit for crushing in an unopened guarantee ring of a plastic screw cap, which has a plurality of holding means for engaging with a collar portion of a container at equidistant inner circumferential positions, and forms an arc. A receiving part having a peripheral surface, and a blade which is concentrically mounted on the receiving part so that a cutting end projects from the peripheral surface and has a plurality of notches formed at the cutting end at intervals corresponding to the distance between the bridging parts. And at least one chisel angled at right angles to the blade and between adjacent notches, and a rotation axis perpendicular to the plane of the blade and above the screw cap. A mandrel capable of moving while rotating the screw cap along the peripheral surface while pressing the peripheral wall of the cup-shaped portion and the unopened assurance ring against the peripheral surface of the receiving portion by eccentrically disposing the cup. The edge of the blade is in tangential contact with the cutting edge of the blade, and a plurality of equiangularly spaced traction teeth meshing with a part of the retaining means inside the unopened assurance ring, which is integrally fitted onto the mandrel. A device for forming an axial slit for crushing in an unopened guarantee ring of a plastic screw cap, which is constituted by a crown. 2. The mandrel has a thread for screwing into a hollow shaft mounted on a carousel that rotates concentrically with the receiving part, and a shoulder for fixing the crown to the top of the hollow shaft. , The crown has a collar that makes tangential contact with the cutting edge on the same plane as the blade, and a plurality of recesses that are provided under the collar and that form traction circumferential teeth for engaging with the holding means. The device for forming an axial slit for crushing in the unopened guarantee ring of the plastic screw cap according to claim 1. 3. A mandrel having a thread for screwing into a hollow shaft mounted on a carousel which rotates concentrically with the receiving part, and a shoulder for fixing the crown to the top of said hollow shaft. , The crown has a collar that is in tangential contact with the cutting edge in the same plane as the blade, and a plurality of teeth that protrude radially from below the collar and that mesh with a recess formed inside the unopened assurance ring. An apparatus for forming an axial slit for crushing in an unopened assurance ring of a plastic screw cap according to claim 1. 4. An unopened assurance ring for a plastic screw cap according to claim 1, wherein the chisel has a recess for forming a bridge across the axial slit of the unopened assurance ring. A device for forming axial slits for crushing. 5. The mandrel top is configured as a tongue which supports the screw cap such that the blade is positioned at a height between the cup-shaped portion of the screw cap and the unopened assurance ring. An apparatus for forming an axial slit for crushing in the unopened guarantee ring of the plastic screw cap according to claim 1. 6. The uncapped assurance ring of the screw cap is provided with a plurality of equidistantly spaced chisels to form a plurality of equiangularly spaced axial slits. A device for forming an axial slit for crushing on the unopened assurance ring of the plastic screw cap described in 1. 7. The cut end of the blade is provided with a notch adapted to form a thicker bridging portion adjacent to the axial slit of the unopened guarantee ring. A device that forms an axial slit for crushing in the unopened assurance ring of a plastic screw cap.