JP2005096842A - Capping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capping device for forming a deeper level difference on a cap top face keeping the soundness of the male screw part and the can body part of a bottle can. <P>SOLUTION: This capping device relates to a throttling member 21 provided with a step forming means which forms a step 12 near the outer edge of a top face 3a in its peripheral direction by covering the mouthpiece part 2d of a bottle can 2 having a male screw part with a bottomed-tubular cap 3 and by pressing the top face 3a of the cap 3 toward the can bottom of the bottle can 2 and a female screw forming part which forms a female screw part on the outer peripheral face of the cap 3 patterned after the male screw part. The level step forming means is supported rotatively to press the outer peripheral edge of the top face 3a and to rotate around the outer peripheral edge of the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a capping device for attaching a cap to a cap portion of a bottle can in order to seal the cap portion of the bottle can.

  In recent years, all-aluminium beverage bottle cans have become widespread, and for these bottle cans, a one-piece bottle can formed by squeezing and ironing an aluminum alloy (also called a two-piece bottle can when a cap is included) Has become mainstream. As shown in FIG. 5, these bottle cans have a shoulder portion 2b with a gradually decreasing diameter at the tip of a bottomed cylindrical can body portion 2a and a diameter smaller than that of the can body portion 2a. And a cap portion 2d formed with 2c. Furthermore, after these bottle cans 2 are filled with various beverages, the cap 3 formed in a bottomed cylindrical shape is attached to the base part 2d by using a capping device. Even a cap once opened can be resealed.

Conventionally, in this type of capping device, as shown in FIG. 5, a cylindrical pressure block 101 and a center of the pressure block 101 are provided so as to be movable in the axial direction, and the top surface 3 a of the cap 3 is pressed. The pressure block insert 102, the RO roller (female screw portion forming means) 103 for forming the female screw portion 3b shown in FIG. 7 on the peripheral surface of the cap following the male screw portion 2c, and the cap 3 shown in FIG. A configuration is known in which a flare 3c at the front end edge portion is bent toward the inside in the radial direction and is provided with a PP roller 104 that is wound around the fogged portion 2f of the base portion 2d.
By this capping device, capping is performed as follows.

  That is, as shown in FIGS. 6 and 7, the top surface 3 a of the cap 3 placed on the cap portion 2 d of the bottle can 2 is pressed and fixed by the pressure block insert 102 toward the bottom of the can. Then, the outer peripheral portion of the top surface 3a is pressed uniformly toward the bottom of the can by the cylindrical pressure block 101, and the top surface 3a is drawn by drawing in the desired depth and radially inward direction. A step 12 is formed on the surface. As shown in FIG. 8, the stepped portion 12 is formed with a large contact area between the liner 11 provided on the inner bottom of the cap 3 and the curled portion 2e formed by folding the tip edge portion of the cap portion 2d. In order to improve the sealing performance.

Further, the tip of the RO roller 103 is brought into contact with the peripheral surface of the cap 3, and the RO roller 103 is rotated in accordance with the male screw portion 2 c from that state, thereby forming the female screw portion 3 b on the peripheral surface of the cap 3. At the same time, the tip of the PP roller 104 is brought into contact with the flare 3c and rotated, so that the flare 3c is bent inward in the radial direction and is wound around the fogged portion 2f. As a result, the cap 3 is attached to the base portion 2d, and the liner 11 provided on the inner bottom of the cap 3 is in close contact with the curled portion 2e at the front end edge of the base portion 2d, thereby ensuring sealing performance. In FIG. 5, reference numeral 105 denotes a spring that biases the pressure block insert 102 toward the bottom of the can.
Various prior arts related to these capping devices 1 have been proposed (see, for example, Patent Document 1).
About these bottle cans 2, in order to prevent the contents from leaking out from the gap between the liner 11 and the curled portion 2e after the cap 3 is mounted, there is a demand for a higher sealing property between the two. For this, it is necessary to deepen the stepped portion 12 and increase the contact area between the liner 11 and the curled portion 2e.
JP 2001-301888 A

  However, in order to form the stepped portion 12 deeply, it is necessary to increase the pressing force toward the bottom of the cap 3 covering the cap portion 2d. When the pressing force is increased, the bottle made of a soft metal such as aluminum is used. There is a problem that the can body 2a of the can 2 is buckled, and the male screw portion 2c is deformed, and the sealing performance is hindered.

  The present invention has been made in view of such circumstances, and it is possible to form a deeper stepped portion on the top surface of the cap while maintaining the soundness of the male screw portion of the bottle can and the can body. An object of the present invention is to provide a capping device that can be used.

In order to solve the above problems, the present invention provides the following means.
According to the first aspect of the present invention, the top of the bottle can is covered with a cap having a bottomed cylindrical shape and the top surface of the cap is pressed toward the bottom of the bottle can. Stepped portion forming means for forming a stepped portion in the vicinity of the outer edge portion of the surface, and female threaded portion forming means for forming a female threaded portion on the outer peripheral surface of the cap following the male threaded portion. The step portion forming means is a throttle member that is supported so as to rotate around the outer peripheral edge portion by pressing the outer peripheral edge portion of the top surface.

  According to the capping device of the present invention, in the state where the cap portion of the bottom of the bottle can is covered with the bottomed cylindrical cap, the throttle member causes the outer peripheral edge portion of the top surface to be canned by the stepped portion forming means. While pressing in the bottom direction, the cap is rotated around the outer peripheral edge of the cap.

According to a second aspect of the present invention, in the capping device according to the first aspect, the throttle member is a disc member formed in a substantially disc shape.
According to the capping device of the present invention, the disk member presses the outer peripheral edge of the top surface and rotates so as to turn on the outer peripheral edge, thereby forming a step portion on the outer peripheral edge. Is done.

According to a third aspect of the present invention, in the capping device according to the first aspect, the throttle member is formed of a spherical member formed in a substantially spherical shape.
According to the capping device of the present invention, the spherical member presses the outer peripheral edge of the top surface and rotates so as to turn on the outer peripheral edge, thereby forming a step portion on the outer peripheral edge. Is done.

According to a fourth aspect of the present invention, in the capping device according to the second aspect, the disk member includes a protrusion directed radially outward at an outer peripheral edge thereof.
According to the capping device of the present invention, the disk member moves while rotating so as to press and rotate the outer peripheral edge of the top surface. Here, since the outer circumferential edge of the disk member is provided with a projecting portion directed outward in the radial direction, the projecting portion bites into the top surface, whereby a deep stepped portion and a shallow stepped portion. Are intermittently formed in the circumferential direction.

As described above, according to the first to third aspects of the present invention, since the step portion is formed by rotating the diaphragm member on the top surface, the overall load on the top surface is reduced. It is possible to form a deeper stepped portion.
According to the invention of claim 4, since the deep step portion and the shallow step portion are intermittently formed in the circumferential direction of the top surface, the internal pressure of the bottle can rises and the top surface portion is outside. Even when it swells, the pressure can be released from a shallow step portion having a weak sealing property, and the explosion-proof property can be improved.

Hereinafter, a capping device according to an embodiment of the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected to what is shown in FIGS. 5-8, and the description is abbreviate | omitted.
In FIG. 1, reference numeral 1 denotes a capping device according to the present embodiment, reference numeral 2 denotes a bottle can, and reference numeral 3 denotes a cap.
The capping device 1 includes a main shaft 6 that is directed downward along an axis L, a cone cam 5 that is attached to an upper side of one end of the main shaft 6, and a substantially cylindrical main frame that is provided so as to surround the main shaft 6. 4.
The main shaft 6 is provided so as to be movable up and down by driving a first driving device (not shown), and a cylindrical pressure block 9 having a step portion 9b at the center is fixed to the lower end thereof.

  A pressure block insert 10 having a substantially bottomed cylindrical shape and having a rubber sheet 26 is attached to the lower end of the pressure block 9. That is, it crosses the axis L formed on the outer peripheral surface of the pressure block insert 10 and the long hole 9a for mounting penetrating the pressure block 9 in the direction crossing the axis L formed near the lower end of the pressure block 9. The mounting pin 22 is inserted into the mounting hole 10b penetrating the outer peripheral surface in the direction, and the pressure block insert 10 is moved in the direction of the axis L by moving the mounting pin 22 between the diameters of the mounting long holes 9a. It is supported movably. Moreover, the convex part 10a orient | assigned upwards is formed in the bottom wall outer surface of the pressure block insert 10, The state which has located the convex part 10a in between the pressure block insert 10 and the step part 9b Thus, a coil spring 23 is interposed. As a result, the pressure block insert 10 is urged downward in the direction of the axis L, and the lower end of the pressure block insert 10 projects from the lower end of the pressure block 9.

  With such a configuration, by driving the first drive device, the main shaft 6 can be moved downward by a predetermined distance, that is, in a direction approaching the cap 3, and at the same time, the pressure block 9 can be used for pressure. The block insert 10 is also moved in the same direction, and the top surface 3 a is pressed and held by the pressure block insert 10 via the rubber sheet 26.

  The main frame 4 is supported so as to be rotatable about the axis L with respect to the main shaft 6 via a ball bearing 7 and movable up and down by driving a second driving device (not shown). At the lower end of the main frame 4, a recess 4b directed upward along the axis L direction is formed along the circumferential direction, and a long hole 4c is formed in a direction intersecting the recess 4b. At the lower end of the main frame 4, a roller arm 20 composed of a protrusion 20a and a main body bearing 20b is attached. That is, the protrusion 20a is fitted into the recess 4b, and the attachment pin 25 is inserted into the attachment hole 20c formed in the protrusion 20a and penetrating in the direction intersecting the axis L, and the elongated hole 4c. The roller arm 20 is supported so as to be movable along the direction of the axis L by moving 25 between the diameters of the long holes 4c. In addition, a coil spring 26 is interposed between the upper end of the recess 4b and the tip of the projection 20a, and the roller arm 20 is biased downward. In the present embodiment, these roller arms As shown in FIG. 2, four 20 are provided at equal intervals along the circumferential direction of the main frame 4. Further, the main body bearing portion 20b is formed with a concave portion 20d directed upward at the lower end thereof. In the concave portion 20d, a squeezing roller 21 (stepped portion forming means) for drawing the top surface 3a of the cap 3 is drawn. , Diaphragm member, disk member).

The squeezing roller 21 is formed in a substantially disk shape, and as shown in FIG. 1, a shaft portion 21a provided in the center and extending in a direction intersecting with the radial direction is directed in a direction intersecting with the axis L direction. In the state, the concave portion 20 is supported so as to be rotatable about the shaft portion 21a and movable up and down. Further, the squeezing roller 21 is urged downward by a urging member (not shown), and a part of the outer peripheral edge of the squeezing roller 21 in a circumferential direction protrudes from the lower end of the main body bearing portion 20b. .
Reference numeral 24 denotes a protective member made of metal for preventing wear caused by relative rotation between the squeezing roller 21 and the pressure block 9.

  With such a configuration, by driving the second driving device, the main frame 4 is moved up and down and rotated about the axis L, whereby the aperture is reduced via the roller arm 20. The roller 21 is revolved around the axis L.

Next, the operation of the capping device 1 according to this embodiment configured as described above will be described.
First, in a state where the cap 3 is put on the cap portion 2d of the bottle can 2, the bottle can 2 is transported to a position coincident with the capping device 1 by a transport device (not shown).
From this state, a stepped portion 12 is formed on the top surface 3a as will be described later, and similarly to the conventional case, processing is performed by a RO roller and a PP roller (not shown), and the cap 3 is attached to the base portion 2d. When the mounting is completed, the bottle can 2 is transported to another position by the transport device, and a new bottle can 2 before the mounting is transported to a position that matches the capping device 1. By repeating these steps, capping is performed on a large number of bottle cans 2.

And in this embodiment, the level | step-difference part 12 is formed as follows.
That is, as described above, when the bottle can 2 is transported to a position coinciding with the capping device 1 with the cap 3 covered, by driving the first driving device, the main shaft 6 moves downward, that is, A predetermined distance is moved in the direction approaching the cap 3, and the pressure block insert 10 is also moved in the same direction via the pressure block 9. Then, the rubber sheet 26 provided at the lower end of the pressure block insert 10 contacts the top surface 3 a of the cap 3. At this time, the coil spring 23 and the rubber sheet 26 that are biased downward serve as cushions, absorb the impact at the time of contact, and prevent the top surface 3a from being damaged. The pressure block insert 10 further moves downward from here, and the movement of the main shaft 6 is stopped at a predetermined time when the top surface 3a is pressed by the pressure block insert 10 via the rubber sheet 26. Thereby, the cap 3 is hold | maintained so that it may not shake.

  Next, by driving the second drive device, the main frame 4 is moved downward by a predetermined distance and at the same time rotated around the axis L, as described above. As a result, as shown in FIG. 2, the four squeezing rollers 21 are also moved downward through the roller arm 20 while revolving around the axis L. Then, the outer peripheral edge of the squeezing roller 21 contacts the four locations near the outer edge portion of the top surface 3a while revolving. Also at this time, the impact is absorbed by the urging member (not shown) provided on the squeeze roller 21 and the coil spring 26 in the same manner as described above. Further, the four squeezing rollers 21 are gradually moved downward and revolved on the top surface 3a, whereby the squeezing rollers 21 are rotated about the shaft portion 21a. Thereby, the drawing roller 21 gradually draws the top surface 3a while rolling on the top surface 3a, and the deeper stepped portion 12 is gradually formed. As shown in FIG. 1, a rising wall portion 3d is formed along the axis L direction inside the step portion 12, and the area of the rising wall portion 3d increases as the depth of the step portion 12 increases. While increasing, the contact area of the curl part 2e formed in the front-end | tip of the bottle can 2 and the liner 11 also becomes large. And if the level | step-difference part 12 is formed in desired depth, the drawing process of the top | upper surface 3a will be complete | finished.

  As described above, according to the capping device 1 according to the present embodiment, only the four portions of the top surface 3a are pressed by the revolution and rotation of the four squeezing rollers 21, and the processing is gradually performed. The load can be reduced, and the deeper stepped portion 12 can be formed without deforming the male screw portion or buckling the can body. And thereby, the contact area of the liner 11 and the curl part 2e can be enlarged, and both sealing performance can be improved.

In the above embodiment, the outer peripheral edge of the squeeze roller 21 is formed in a perfect circle shape, but instead of this configuration, as shown in FIG. 3, as a member corresponding to the squeeze roller 21 of the above embodiment, Another squeezing roller 30 may be provided, and a plurality of protrusions 30 a directed outward in the radial direction may be formed on the outer peripheral edge of the roller 30.
Under such a configuration, when the other squeezing roller 30 is rotated on the top surface 3a, the protrusion 30a is not easily inward of the top surface 3a, and the deep stepped portion 12 and the shallow surface are shallow on the top surface 3a. The step portion 12 is intermittently formed.
Thereby, even when the internal pressure of the bottle can 2 rises and the top surface 3a swells outward, the pressure can be released from the shallow step portion 12 having a weak sealing property, and the explosion-proof property can be improved. Become.

In the above embodiment, four squeezing rollers 21 are provided. However, the number is not limited to this, and the number of the squeezing rollers 21 may be changed as appropriate.
Further, although the squeezing roller 21 has a substantially disk shape, it may be replaced with a spherical member 31 formed in a substantially spherical shape as shown in FIG.

It is a schematic structure figure showing one embodiment of a capping device concerning the present invention. It is explanatory drawing which shows the aperture roller in the same embodiment. It is explanatory drawing which shows the other aperture roller in the same embodiment. It is explanatory drawing which shows the spherical member provided instead of the aperture roller in the same embodiment. It is a schematic block diagram which shows the conventional capping apparatus. It is the figure which showed the mode of mounting | wearing processing of the conventional capping apparatus, and is explanatory drawing which shows the state before forming a level | step-difference part. It is the figure which showed the mode of the mounting process of the conventional capping apparatus, and is explanatory drawing which shows the state in which the level | step-difference part was formed. It is explanatory drawing which shows the state which the curl part and the liner are contacting by forming a level | step-difference part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capping apparatus 2 Bottle can 2c Male thread part 2d Cap part 3 Cap 3a Top surface 3b Female thread part 12 Step part 21 Squeezing roller (step part formation means, squeeze member, disk member)
30 Other squeezing rollers 30a Protruding portion 31 Spherical member 103 RO roller (internal thread portion forming means)
L axis

Claims (4)

Covering the base of the bottle can with a male threaded portion with a bottomed cylindrical cap and pressing the top surface of the cap toward the bottom of the bottle can, near the outer edge of the top surface, Stepped portion forming means for forming a stepped portion in the circumferential direction, and female threaded portion forming means for forming a female threaded portion on the outer peripheral surface of the cap following the male threaded portion,
The capping device, wherein the stepped portion forming means is a throttle member that is supported so as to rotate around the outer peripheral edge by pressing the outer peripheral edge of the top surface.   The capping device according to claim 1, wherein the aperture member is a disk member formed in a substantially disk shape.   2. The capping device according to claim 1, wherein the throttle member is formed of a spherical member formed in a substantially spherical shape. The capping device according to claim 2, wherein the disk member includes a protrusion directed outward in the radial direction at an outer peripheral edge thereof.

Images