JP2006255739A - Method and device for forming pilfer-proof cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming method and a forming device for a pilfer-proof cap which ensure the rigidity and the forming accuracy of a predetermined part to be formed with a screw and a skirt part, thereby achieving stable forming. <P>SOLUTION: The predetermined part 11k to be formed with the screw and the skirt part 11m are formed by rolling a peripheral wall part 11a equivalent to the predetermined part 11k to be formed with the screw and the peripheral wall part 11a equivalent to the skirt part 11m at approximately the same circumferential speed by pressing them all around the periphery with an outer tool 3 and an inner tool 5 by pressing a first outer periphery holding surface 3d and a first inner periphery holding surface 5e against each other through the peripheral wall part 11a and also pressing a second outer periphery holding surface 3k and a second inner periphery holding surface 5m against each other through the peripheral wall part 11a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a pill fur proof suitable for a case where a peripheral wall portion of a cap material fitted to a screw thread formed in a mouth portion of a container is subjected to a molding process in a beverage container such as a bottle can, a plastic bottle, or a glass bottle. The present invention relates to a cap forming method and a pill fur proof cap forming apparatus.

  For example, when forming a cap for a bottle can used as a container for beverages, a plurality of cutting blades are formed at intervals in the circumferential direction of the peripheral wall portion of the cap material obtained by punching aluminum or an aluminum alloy plate into a cup shape. The cap material is rolled along the outer tool while being sandwiched between the outer tool and the inner tool fitted to the inner peripheral surface of the cap material, over the entire circumference of the peripheral wall portion of the cap material, Form at least a part to be screw-molded, an easy-to-break part with multiple slits recessed radially inward in the circumferential direction via a bridge, and a skirt part, thereby forming a cap with a pill fur proof function A molding apparatus is known (see, for example, Patent Document 1).

FIG. 5 is a conceptual diagram showing a state in which a thread forming scheduled portion and the like are formed on the cap 11 by the bottle can cap forming apparatus 101 (hereinafter simply referred to as “forming apparatus 101”) disclosed in Patent Document 1. The molding apparatus 101 is fixedly attached to an apparatus main body (not shown), and can be rotated in the A direction in the figure with the outer tool 3 forming a part of a substantially fan shape in plan view and the axis L as a center. And an inner tool 105 having a substantially cylindrical shape that is advanced and retracted in the direction B in the drawing so that the locus of the axis L in a plan view draws an arc P that is concentric with the outer peripheral molded portion 3a of the outer tool 3. The cap 11 having the cylindrical peripheral wall portion 11 a is configured to be sandwiched between the outer tool 3 and the inner tool 105.
The diameter of the inner peripheral molded portion 105a of the inner tool 105 is smaller than the inner diameter of the cap 11, and the inner tool 105 advances and retreats in the B direction while the inner peripheral molded portion 105a is pressed against the inner surface side of the peripheral wall portion 11a. Is done.
When the inner tool 105 is located at a position where the inner peripheral molding portion 105a and the outer peripheral molding portion 3a correspond via the cap 11 (dotted line position in FIG. 5), the cap 11 has the outer peripheral molding portion 3a and the inner peripheral molding portion 105a. It is rolled while being pinched by.
And the predetermined | prescribed screw formation plan part etc. are formed over the perimeter of the surrounding wall part 11a by rolling the surrounding wall part 11a of the cap 11 over the perimeter.

Referring to FIG. 6 which is a view taken in the direction of the arrow X in FIG. 5, the state in which the thread forming scheduled portion and the like are formed will be described. In FIG. And a plurality of knurled cutting blades 3b projecting toward the peripheral wall portion 11a, and a groove forming convexity 3c connected to the knurled cutting blade 3b.
The outer tool 3 is connected to the groove-forming convex portion 3c, and is formed on a first outer peripheral holding surface 3d formed to extend substantially parallel to the axis L, and the first outer peripheral holding surface 3d. The upper bead portion forming recess 3f provided continuously and a plurality of slit forming portions that are provided continuously to the upper bead portion forming recess 3f and project toward the peripheral wall portion 11a at intervals in the arc P direction. 3g for cutting edges, and the lower bead part shaping | molding recess 3h provided in a row by this slit shaping cutting blade part 3g.

Further, the outer tool 3 includes a second outer peripheral holding surface 3k which is connected to the lower bead portion forming recess 3h and extends while being inclined in a direction away from the axis L.
The knurled part cutting edge 3b, the groove part forming convex part 3c, the first outer peripheral holding surface 3d, the slit forming cutting edge part 3g, and the second outer peripheral holding surface 3k make the outer periphery. A molding part 3a is configured.

The inner tool 105 has a substantially cylindrical shape with an upper end surface 105c that is in contact with the inner surface of the disk-shaped top plate portion 11b of the cap 11 and a shaft 7 that is fitted to the inner tool 105. And.
Further, the inner tool 105 includes a knurled portion / groove portion forming recess 105d formed to extend to positions corresponding to both the knurled portion forming cutting edge 3b and the groove portion forming convex portion 3c, A first opposing wall surface 105e formed to extend to a position corresponding to the outer peripheral holding surface 3d, and an upper bead formed to protrude toward the peripheral wall portion 11a at a position corresponding to the upper bead portion forming recess 3f. 105 g of part forming convex part, 105 h of slit forming recessed parts formed in the position corresponding to the cutting blade part 3 g for slit forming, and the lower bead part formed in the position corresponding to the recessed part 3 h for lower bead part forming And a molding convex portion 105k.

Furthermore, the inner tool 105 is formed at a position corresponding to the second outer peripheral holding surface 3k, and extends in a direction away from the axis L with an inclination equal to that of the second outer peripheral holding surface 3k. It has.
The upper bead portion forming convex portion 105g and the lower bead portion forming convex portion 105k constitute the inner peripheral formed portion 105a.

At the time of molding, the cap 11 is rolled while being sandwiched between the outer tool 3 and the inner tool 105, and the outer peripheral molded portion 3a and the inner peripheral molded portion 105a respectively shear or press the peripheral wall portion 11a.
Thus, the knurled cutting blade 3b and the slit-shaped cutting blade 3g are penetrated by shearing the peripheral wall portion 11a, and a plurality of the knurled portions 11c and the circumferential wall portion 11a are spaced apart in the circumferential direction. Each of the slit portions 11d is formed.
The plurality of slit portions 11d and the bridge portion 11p disposed between the slit portions 11d constitute an easy break portion, and the upper portion and the lower portion of the easy break portion are connected.
Further, when the groove portion forming convex portion 3c presses the peripheral wall portion 11a, the groove portion 11e is formed to bulge inward in the radial direction.

Further, the upper bead portion forming convex portion 105g and the lower bead portion forming convex portion 105k press the peripheral wall portion 11a, so that the upper bead portion 11g and the lower bead portion 11h swell outward in the radial direction. Formed out.
The first outer peripheral holding surface 3d and the second outer peripheral holding surface 3k are in contact with the outer side of the peripheral wall portion 11a, and these contact portions are a screw forming scheduled portion 11k and a skirt portion 11m, respectively.

The cap 11 on which the thread forming scheduled portion 11k and the like are formed is put on a bottle can base portion (not shown) and then capped on the bottle can base portion.
JP 7-89562 A

However, in the conventional molding apparatus 101, since the outer tool 3 and the inner tool 105 are both rigid bodies, the knurling blade 3b and the slit blade 3g are pushed to the peripheral wall 11a to a predetermined depth. If it tries to insert, it is inevitable that clearance CL1 and clearance CL2 will occur between the peripheral wall portion 11a and the first opposing wall surface 105e and between the peripheral wall portion 11a and the second opposing wall surface 105m, respectively. (See FIG. 6).
Therefore, since the screw forming scheduled portion 11k and the skirt portion 11m are hardly pressed, work hardening hardly occurs, and the rigidity of the screw forming planned portion 11k and the skirt portion 11m cannot be improved.
Further, since only the outside of the peripheral wall portion 11a is constrained when the screw forming planned portion 11k and the skirt portion 11m are formed, the forming accuracy of the screw forming planned portion 11k and the skirt portion 11m also varies.

For example, if the rigidity of the thread forming planned portion 11k is low, when a female screw is formed by a screw roll (not shown) at the time of capping, the screw roll goes too deep into the thread forming planned section 11k, and the upper bead portion 11g and the bridge 11p connected to this. And the like are lifted upward, and the bridge 11p may be twisted and broken.
Similarly, even when the rigidity of the skirt portion 11m is low, when a skirt winding process is performed on the skirt portion 11m at the time of capping, a hem winding roll (not shown) enters the skirt portion 11m too deeply and is connected to the lower bead portion. Since 11h, the bridge 11p, and the like are pulled downward, the bridge 11p may be twisted and broken.

Further, since only the outside of the peripheral wall portion 11a is constrained when the screw forming scheduled portion 11k and the skirt portion 11m are formed, a peripheral speed difference is generated between the screw forming planned portion 11k and the skirt portion 11m, and the bridge 11p In some cases, twisting occurred and the material broke.
Further, if the molding accuracy of the skirt portion 11m, particularly roundness, is low, the cap 11 is removed before the bridge 11p is broken when the bottle can is opened even if the skirt portion 11m is subjected to a hem winding process at the time of capping. The so-called slip-out problem that occurs when the skirt part 11m is detached from the bottle can occurs, and the skirt part 11m and the bottle can interfere with each other, so that the customer can attach the cap to the bottle can again (reseal). It was difficult.

  In view of the above-described problems, the present invention provides a method for forming a pill fur proof cap and a pill fur proof cap forming apparatus capable of ensuring the rigidity and forming accuracy of a thread forming scheduled portion and a skirt portion and performing stable forming. The purpose is to provide.

  In order to solve the above-described problems and achieve such an object, a method for forming a pill fur proof cap according to claim 1 includes a top plate portion and a peripheral wall portion suspended from the peripheral portion of the top plate portion. And rolling the cap material with the outer tool and the inner tool, and forming the entire circumferential wall portion while sandwiching the circumferential wall portion, so that at least the thread forming portion and the screw An easily breakable portion in which a plurality of slit portions that are recessed inward in the radial direction are formed in the circumferential direction via a bridge, and a skirt portion that is continuously provided at the lower end portion of the easily breakable portion. And forming the screw molding scheduled portion by using the outer tool and the inner tool, the inner and outer portions of the peripheral wall portion forming the screw molding scheduled portion. A surface, is characterized in that the pressing in the thickness direction over the entire region in the axial direction of the cap member.

According to the first aspect of the present invention, since the inner and outer surfaces of the portion forming the screw forming scheduled portion are formed while being pressed over the entire area in the axial direction of the cap material by the outer tool and the inner tool, this screw forming Work hardening occurs on the inner and outer surfaces of the portion forming the planned portion.
Therefore, at the time of capping, the screw roll does not go deeper than necessary into the thread forming portion, and the easy breakable portion connected to the lower end portion of the thread forming portion is lifted upward and the bridge is twisted. Nor.
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion where the screw forming scheduled portion is formed, the forming accuracy of the screw forming planned portion can be determined by the outer tool and the inner tool.

  The method for forming a cap for a pilfer proof according to claim 2 rolls a cap member comprising a top plate portion and a peripheral wall portion suspended from the peripheral edge portion of the top plate portion, and the outer tool and the inner tool are used to roll the cap material. While sandwiching the peripheral wall portion, the peripheral wall portion is molded over the entire circumference, so that at least a thread forming portion and a slit recessed inward in the radial direction are provided at least at the lower end portion of the screw forming portion. A method of forming a plurality of easily breakable portions formed in a circumferential direction via a bridge and a skirt portion connected to a lower end portion of the easily breakable portion, when forming the skirt portion, With the outer tool and the inner tool, the inner and outer surfaces of the part forming the skirt portion of the peripheral wall portion are extended in the thickness direction over the entire region in the axial direction of the cap material. It is characterized in that the pressure.

According to the second aspect of the present invention, the inner and outer surfaces of the portion forming the skirt portion are molded while being pressed over the entire area in the axial direction of the cap material by the outer tool and the inner tool. Work hardening occurs on the inner and outer surfaces of the part to be performed.
Therefore, at the time of capping, the skirt winding roll does not go deeper than necessary into the skirt portion, and the easily breakable portion connected to the upper end portion of the skirt portion is pulled downward and the bridge is not twisted. .
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion forming the skirt portion, the molding accuracy of the skirt portion can be determined by the outer tool and the inner tool.

  The method for forming a cap for a pilfer proof according to claim 3 is the molding method according to claim 1, wherein when the skirt portion is formed, the outer tool and the inner tool are used to form the skirt portion of the peripheral wall portion. The inner and outer surfaces of the portion forming the skirt portion are pressed in the thickness direction over the entire region in the axial direction of the cap material.

According to the invention described in claim 3, since the inner and outer surfaces of the portion forming the screw forming scheduled portion are formed while being pressed over the entire area in the axial direction of the cap material by the outer tool and the inner tool, this screw forming Work hardening occurs on the inner and outer surfaces of the portion forming the planned portion.
Therefore, at the time of capping, the screw roll does not go deeper than necessary into the thread forming portion, and the easy breakable portion connected to the lower end portion of the thread forming portion is lifted upward and the bridge is twisted. Nor.
In addition, the inner and outer surfaces of the part that forms the skirt part are molded while being pressed over the entire area in the axial direction of the cap material by the outer tool and the inner tool, so the inner and outer surfaces of the part that forms the skirt part are processed. Curing occurs.
Therefore, at the time of capping, the skirt winding roll does not go deeper than necessary into the skirt portion, and the easily breakable portion connected to the upper end portion of the skirt portion is pulled downward and the bridge is not twisted. .
Furthermore, the inner and outer surfaces of the peripheral wall portion forming the thread forming portion and the inner and outer surfaces forming the skirt portion are both constrained and rolled at the same peripheral speed. There is no twist.

According to the invention of claim 3, since there is no clearance between the peripheral wall portion and the inner tool in the portion where the screw forming planned portion is formed, the forming accuracy of the screw forming planned portion is determined by the outer tool and the inner tool. Can be determined.
Furthermore, since there is no clearance between the peripheral wall portion and the inner tool in the portion forming the skirt portion, the molding accuracy of the skirt portion can also be determined by the outer tool and the inner tool.

  The apparatus for forming a cap for a pilfer proof according to claim 4 rolls a cap member including a top plate portion and a peripheral wall portion suspended from the peripheral edge portion of the top plate portion, and the outer tool and the inner tool are used to roll the cap material. While sandwiching the peripheral wall portion, the peripheral wall portion is molded over the entire circumference, so that at least a thread forming portion and a slit recessed inward in the radial direction are provided at least at the lower end portion of the screw forming portion. A plurality of easily breakable portions formed in a circumferential direction via a bridge, and a skirt portion continuously provided at a lower end portion of the easily breakable portion, wherein the thread forming scheduled portion is the outer portion The cap material is formed by being sandwiched in the thickness direction by the first outer peripheral holding surface of the tool and the first inner peripheral holding surface of the inner tool, and the first outer peripheral holding surface is formed. At least one of the surface and the first inner peripheral holding surface is supported by the first deformation allowance portion so as to be movable in the radial direction, and when forming the screw forming scheduled portion, the first deformation allowance portion Is elastically deformed in the radial direction.

According to the fourth aspect of the present invention, the thread forming scheduled portion is formed while being pressed by the first outer peripheral holding surface of the outer tool and the first inner peripheral holding surface of the inner tool. Work hardening occurs in the part.
Therefore, at the time of capping, the screw roll does not go deeper than necessary into the thread forming portion, and the easy breakable portion connected to the lower end portion of the thread forming portion is lifted upward and the bridge is twisted. Nor.
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion where the screw forming scheduled portion is formed, the forming accuracy of the screw forming planned portion can be determined by the outer tool and the inner tool.
Further, by providing the first deformation allowance portion, the thread forming scheduled portion is formed so as to be sandwiched between the first outer peripheral holding surface of the outer tool and the first inner peripheral holding surface of the inner tool without clearance. Since the first deformation allowing portion is elastically deformed in the radial direction and at least one of the first outer peripheral holding surface and the first inner peripheral holding surface is moved in the radial direction, the cutting blade for forming the slit portion is The movement in the radial direction is not restricted and can be pushed into the peripheral wall portion to a predetermined depth.

  The apparatus for forming a cap for a pilfer proof according to claim 5 rolls a cap member including a top plate portion and a peripheral wall portion suspended from a peripheral portion of the top plate portion, and the outer tool and the inner tool are used to roll the cap material. While sandwiching the peripheral wall portion, the peripheral wall portion is formed over the entire circumference thereof, so that at least a screw forming planned portion and a slit that is continuously provided at the lower end portion of the screw forming planned portion and recessed inward in the radial direction. A plurality of easily breakable portions formed in a circumferential direction via a bridge, and a skirt portion continuously provided at a lower end portion of the easily breakable portion, the skirt portion of the outer tool The second outer periphery holding surface and the second inner periphery holding surface of the inner tool are formed by being sandwiched in the thickness direction by the cap material, and the second outer periphery holding surface. And at least one of the second inner peripheral holding surfaces is supported by the second deformation allowance portion so as to be movable in the radial direction, and when the skirt portion is formed, the second deformation allowance portion has a diameter. It is characterized by elastic deformation in the direction.

According to the invention of claim 5, the skirt portion is molded while being pressed by the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool. Occurs.
Therefore, at the time of capping, the skirt winding roll does not go deeper than necessary into the skirt portion, and the easily breakable portion connected to the upper end portion of the skirt portion is pulled downward and the bridge is not twisted. .
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion forming the skirt portion, the molding accuracy of the skirt portion can be determined by the outer tool and the inner tool.
Furthermore, by providing the second deformation allowing portion, even if the skirt portion is molded so as to be sandwiched between the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool without clearance, Since the second deformation allowing portion is elastically deformed in the radial direction and at least one of the second outer peripheral holding surface and the second inner peripheral holding surface is moved in the radial direction, the cutting blade for forming the slit portion is in the radial direction. Can be pushed into the peripheral wall portion to a predetermined depth without being restricted.

  According to a sixth aspect of the present invention, there is provided a molding apparatus for a pilfer proof cap according to the fourth aspect, wherein the skirt portion includes a second outer peripheral holding surface of the outer tool and a second outer tool holding surface. The cap material is formed by being sandwiched in the thickness direction by the inner peripheral holding surface, and at least one of the second outer peripheral holding surface and the second inner peripheral holding surface is the second The second deformation permission portion is elastically deformed in the radial direction when the skirt portion is formed.

According to the sixth aspect of the present invention, the thread forming scheduled portion is molded while being pressed by the first outer peripheral holding surface of the outer tool and the first inner peripheral holding surface of the inner tool. Work hardening occurs in the part.
Therefore, at the time of capping, the screw roll does not go deeper than necessary into the thread forming portion, and the easy breakable portion connected to the lower end portion of the thread forming portion is lifted upward and the bridge is twisted. Nor.
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion where the screw forming scheduled portion is formed, the forming accuracy of the screw forming planned portion can be determined by the outer tool and the inner tool.
In addition, by providing the first deformation allowance portion, the thread forming scheduled portion is formed so as to be sandwiched between the first outer peripheral holding surface of the outer tool and the first inner peripheral holding surface of the inner tool without clearance. Since the first deformation allowing portion is elastically deformed in the radial direction and at least one of the first outer peripheral holding surface and the first inner peripheral holding surface is moved in the radial direction, the cutting blade for forming the slit portion is The movement in the radial direction is not restricted and can be pushed into the peripheral wall portion to a predetermined depth.

According to the invention of claim 6, the skirt portion is molded while being pressed by the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool. Work hardening occurs.
Therefore, at the time of capping, the skirt winding roll does not go deeper than necessary into the skirt portion, and the easily breakable portion connected to the upper end portion of the skirt portion is pulled downward and the bridge is not twisted. .
Further, since there is no clearance between the peripheral wall portion and the inner tool in the portion forming the skirt portion, the molding accuracy of the skirt portion can be determined by the outer tool and the inner tool.
Further, by providing the second deformation allowing portion, even if the skirt portion is molded so as to be sandwiched between the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool without clearance, Since the second deformation allowing portion is elastically deformed in the radial direction and at least one of the second outer peripheral holding surface and the second inner peripheral holding surface is moved in the radial direction, the cutting blade for forming the slit portion is in the radial direction. Can be pushed into the peripheral wall portion to a predetermined depth without being restricted.

  Furthermore, according to the sixth aspect of the present invention, since the thread forming scheduled portion and the skirt portion are both constrained and rolled at the same peripheral speed, the bridge is not twisted even during forming.

According to the method for forming a pilfer proof cap and the apparatus for forming a pilfer proof cap according to the present invention, it is possible to improve the rigidity of the thread forming scheduled portion and the skirt portion, and thus the bridge is twisted during capping. Can be prevented from breaking.
In addition, according to the pilfer proof cap molding method and the pillfer proof cap molding apparatus according to the present invention, it is possible to roll at the same peripheral speed while constraining both the thread molding scheduled portion and the skirt portion during molding. Therefore, it is possible to more reliably prevent the bridge from being twisted.
Furthermore, according to the method for forming a pill fur proof cap and the device for forming a pill fur proof cap according to the present invention, the thread forming scheduled portion and the skirt portion can be accurately formed, so that the bridge is broken when the bottle can is opened. It is possible to prevent so-called slipping off, in which the cap is detached from the bottle can together with the skirt portion, and to improve resealability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 4 show a bottle can cap forming apparatus 1 to which the present invention is applied (hereinafter simply referred to as “forming apparatus 1”).
As shown in FIG. 1, the forming apparatus 1 is fixedly attached to an apparatus main body (not shown) and rotates in the direction A about an axis L with an outer tool 3 forming a part of a substantially fan shape in plan view. An inner tool 5 that has a substantially cylindrical shape that is made to move forward and backward in the direction B in the drawing so that the locus in a plan view of the axis L draws a circular arc P concentric with the outer peripheral molded portion 3a of the outer tool 3. The cap 11 having a cylindrical peripheral wall portion 11a is sandwiched between the outer tool 3 and the inner tool 5.
The diameter of the inner peripheral molded portion 5a of the inner tool 5 is smaller than the inner diameter of the cap 11, and the inner tool 5 advances and retreats in the B direction while the inner peripheral molded portion 5a is pressed against the inner surface side of the peripheral wall portion 11a. Is done.
When the inner tool 5 is located at a position (a dotted line position in FIG. 1) where the inner peripheral molded portion 5a and the outer peripheral molded portion 3a correspond via the cap 11, the cap 11 is connected to the outer peripheral molded portion 3a and the inner peripheral molded portion 5a. It is rolled while being pinched by.
And the predetermined | prescribed screw formation plan part etc. are formed over the perimeter of the surrounding wall part 11a by rolling the surrounding wall part 11a of the cap 11 over the perimeter.

  Since the configuration of the molding apparatus 1 is the same as that of the conventional molding apparatus 101 shown in FIG. 6 described above except for the inner tool 5, the same parts as those in the configuration shown in FIG. Hereinafter, the inner tool 5 different from FIG. 6 will be mainly described.

FIG. 2 shows a state in which a thread forming scheduled portion and the like are formed in the embodiment of the present invention, and corresponds to FIG. 6 in the conventional forming apparatus 101.
The inner tool 5 has an upper end surface 5c that is in contact with the inner surface of the disc-shaped top plate portion 11b of the cap 11 and an upper end portion 5b that has a substantially cylindrical shape to which a shaft 7 that is fitted to the inner tool 5 is attached. And.
The inner tool 5 includes a knurled portion / groove portion forming recess 5d formed extending to a position corresponding to both the knurled portion forming cutting edge 3b and the groove portion forming convex portion 3c, and a first portion. A first inner peripheral holding surface 5e formed in contact with the inner side of the peripheral wall portion 11a at a position corresponding to the outer peripheral holding surface 3d and extending substantially parallel to the axis L, and an upper bead portion forming recess 3f And an upper bead portion forming convex portion 5g formed to protrude toward the peripheral wall portion 11a, a slit forming recess portion 5h formed at a position corresponding to the slit forming cutting blade portion 3g, A bead portion forming recess 3h and a lower bead portion forming convex portion 5k formed at a corresponding position are provided.

Furthermore, the inner tool 5 is in contact with the inner side of the peripheral wall portion 11a at a position corresponding to the second outer peripheral holding surface 3k, and is formed with a second outer peripheral holding surface 3k formed so as to extend substantially parallel to the axis L. And a second inner peripheral holding surface 5m extending with an equal inclination.
The first inner peripheral holding surface 5e, the upper bead portion forming convex portion 5g, the lower bead portion forming convex portion 5k, and the second inner peripheral holding surface 5m constitute the inner peripheral molded portion 5a. Has been.

  In the present embodiment, the first deformation allowing portion D1 is provided between the first inner peripheral holding surface 5e of the inner tool 5 and the shaft 7, and the second inner peripheral holding of the inner tool 5 is maintained. The point from which the 2nd deformation | transformation permission part D2 is provided between the surface 5m and the shaft 7 differs from the conventional shaping | molding apparatus 101. FIG.

FIG. 3A is an enlarged view of the first deformation allowing portion D1, and in FIG. 3A, the inner tool 5 is a first inner annular member that is fitted to the shaft 7 and is rotatable. 9a and a first outer annular member disposed concentrically with the first inner annular member 9a in a radial direction so as to surround the outer periphery of the first inner annular member 9a and to be movable in the radial direction And a member 9b.
Here, in the present embodiment, in order to make the first outer annular member 9b movable in the radial direction, the thickness of the first outer annular member 9b in the axis L direction is set to the first inner annular member 9a. And a clearance is provided in the vertical direction of the first outer annular member 9b.

A first outer circumferential recess 9c is formed on the outer circumferential surface of the first inner annular member 9a so as to extend in the circumferential direction, and the first outer circumferential recess 9c and the first outer annular member 9b are the first. A first O-ring 9e is mounted between the inner peripheral wall surface 9d.
And the 1st deformation | transformation permission part D1 is comprised by the 1st inner side annular member 9a, the 1st outer periphery recessed part 9c, and the 1st O-ring 9e.
The outer peripheral surface of the first outer annular member 9b is the first inner peripheral holding surface 5e.

Similarly, FIG. 3B is an enlarged view of the second deformation allowing portion D2, and in FIG. 3B, the inner tool 5 is fitted to the shaft 7 and is rotatable. An inner annular member 21a and a second inner annular member 21a are disposed concentrically with a gap in the radial direction, surround the outer periphery of the second inner annular member 21a, and are movable in the radial direction. The outer annular member 21b.
Here, in order to make the second outer annular member 21b movable in the radial direction, in the present embodiment, the thickness of the second outer annular member 21b in the axis L direction is the second inner annular member 21a. And a clearance is provided in the vertical direction of the second outer annular member 21b.

A second outer peripheral recess 21c is formed on the outer peripheral surface of the second inner annular member 21a so as to extend in the circumferential direction, and the second outer peripheral recess 21c and the second outer annular member 21b are second. A second O-ring 21e is attached to the inner peripheral wall surface 21d.
And the 2nd deformation | transformation tolerance part D2 is comprised by the 2nd inner side annular member 21a, the 2nd outer periphery recessed part 21c, and the 2nd O-ring 21e.
The outer peripheral surface of the second outer annular member 21b is the second inner peripheral holding surface 5m.

Operation | movement of the shaping | molding apparatus 1 comprised as mentioned above is demonstrated.
In FIG. 2, at the time of molding, the cap 11 is rolled while being sandwiched between the outer tool 3 and the inner tool 5, and the outer peripheral molded part 3a and the inner peripheral molded part 5a respectively shear or press the peripheral wall part 11a. .
Thus, the knurled cutting blade 3b and the slit-shaped cutting blade 3g are penetrated by shearing the peripheral wall portion 11a, and a plurality of the knurled portions 11c and the circumferential wall portion 11a are spaced apart in the circumferential direction. Each of the slit portions 11d is formed.
The plurality of slit portions 11d and the bridge portion 11p disposed between the slit portions 11d constitute an easy break portion, and the upper portion and the lower portion of the easy break portion are connected.

Further, when the groove portion forming convex portion 3c presses the peripheral wall portion 11a, the groove portion 11e is formed to bulge inward in the radial direction.
Further, the upper bead portion forming convex portion 5g and the lower bead portion forming convex portion 5k press the peripheral wall portion 11a, so that the upper bead portion 11g and the lower bead portion 11h swell outward in the radial direction, respectively. Formed out.

  Next, the thread forming scheduled portion 11k and the skirt portion 11m will be described. As described above, in the conventional forming apparatus 101, the outer tool 3 and the inner tool 105 are both rigid bodies. In order to push 3b and the slit-forming cutting edge part 3g into the peripheral wall part 11a to a predetermined depth, the clearance CL1 is provided between the peripheral wall part 11a and the first opposing wall surface 105e, and the peripheral wall part 11a and the first Since the clearance CL2 is generated between the two opposing wall surfaces 105m, the tool configuration has to be made.

However, in the present embodiment, the first deformation allowing portion D1 is provided, and the inner surface side of the peripheral wall portion 11a and the first inner peripheral holding surface 5e are positively abutted during molding. .
That is, even if the inner surface side of the peripheral wall portion 11a and the first inner peripheral holding surface 5e come into contact with each other before the knurled cutting blade 3b and the slit forming cutting portion 3g are pushed to a predetermined depth, At the contact portion, a radially inward force acts on the first outer annular member 9b of the inner tool 5, so that the first outer annular member 9b compresses the first O-ring 9e as shown in FIG. It is moved in the direction of the shaft 7 from the initial position of the one-dot chain line in a) to the position of the solid line.
As a result, the knurling blade 3b and the slit forming blade 3g can be pushed into the peripheral wall portion 11a to a predetermined depth.

Similarly, in the present embodiment, by providing the second deformation allowing portion D2, the peripheral wall is formed before the knurling cutting blade 3b and the slit forming cutting blade portion 3g are pushed to a predetermined depth. Even if the inner surface side of the portion 11a and the second inner peripheral holding surface 5m come into contact with each other, a force directed radially inward acts on the second outer annular member 21b of the inner tool 5 at this contact portion. The second outer annular member 21b is moved in the direction of the shaft 7 from the initial position of the one-dot chain line in FIG. 3B to the position of the solid line while crushing the second O-ring 21e.
As a result, the knurling blade 3b and the slit forming blade 3g can be pushed into the peripheral wall portion 11a to a predetermined depth.

  By providing the first deformation allowing portion D1 and the second deformation allowing portion D2, the thread forming scheduled portion 11k is formed while being pressed by the first outer peripheral holding surface 3d and the first inner peripheral holding surface 5e. Since the skirt portion 11m is molded while being pressed by the second outer peripheral holding surface 3k and the second inner peripheral holding surface 5m, work hardening occurs on the inner and outer surfaces of the thread forming scheduled portion 11k and the skirt portion 11m. Thus, the rigidity is improved, and the forming accuracy of the thread forming scheduled portion 11k and the skirt portion 11m is also well determined by the outer tool 3 and the inner tool 5.

When the rigidity of the thread forming part 11k is improved, the screw roll does not go deeper than necessary when capping, and the upper bead part 11g and the bridge 11p connected to the upper part are lifted upward and the bridge 11p is twisted. There is no participation.
Further, when the rigidity of the skirt portion 11m is improved, the hem winding roll does not go deeper than necessary at the time of capping, and the lower bead portion 11h and the bridge 11p, etc. connected to the skirt roll are pulled downward to the bridge 11p. There is no twist.
Furthermore, both the thread forming scheduled portion 11k and the skirt portion 11m are formed while being rolled at the same peripheral speed while being constrained by the inner tool 3 and the outer tool 5, so that the bridge 11p is also twisted during forming. There is no.

  And as FIG. 4 shows, when shaping | molding of the cap 11 is completed and the inner tool 5 is spaced apart from the surrounding wall part 11a, the 1st O-ring 9e will be from the pressing force by the 1st outer side annular member 9b. Since the second O-ring 21e is released from the pressing force by the second outer annular member 21b, the first outer annular member 9b and the second outer annular member are restored by the restoring force of these O-rings. 21b is returned to the initial position.

  The cap 11 formed as described above is capped on the bottle can by being plastically deformed so as to follow the shape of the bottle can base after being put on a bottle can base not shown. When rotated with respect to the bottle can base part, the upper part of the cap 11 rotates while moving upward according to the thread lead formed on the bottle can base part, while the lower part of the cap 11 is the bottle can base part. The cap 11 is separated from the upper and lower portions by only being rotated by being locked to the bulging portion and not moving upward, and the bridge 11p is torn off.

As described above, according to the present embodiment, since the rigidity of the thread forming scheduled portion 11k and the skirt portion 11m can be improved, it is possible to prevent the bridge 11p from being twisted and broken during capping. it can.
In addition, according to the present embodiment, since the rolling can be performed at the same peripheral speed while constraining both the thread forming portion 11k and the skirt portion 11m at the time of forming, the bridge 11p is twisted, and the bridge 11p at the time of subsequent capping. Can be more reliably prevented from breaking.
In addition, according to the present embodiment, since the thread forming scheduled portion 11k and the skirt portion 11m can be accurately formed, the cap 11 is detached from the bottle can together with the skirt portion 11m before the bridge 11p is broken when the bottle can is opened. The so-called slip-off can be prevented and the resealability can be improved.

  Further, according to the present embodiment, the first deformation allowing portion D1 includes the first O-ring 9e between the first inner annular member 9a and the first outer annular member 9b. In addition, since the second deformation allowing portion D2 includes the second O-ring 21e between the second inner annular member 21a and the second outer annular member 21b, these first deformation allowing portions The part D1 and the second deformation allowance part D2 do not need to have a large configuration.

The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist.
Specifically, in the above-described embodiment, the first deformation permissible portion D1 and the second deformation permissible portion D2 are provided, but if provided in at least one of them, the above-described required effect is achieved. can do.
Further, in the above-described embodiment, the first deformation allowance portion D1 and the second deformation allowance portion D2 are provided on the inner tool 5 side, but instead of this, the outer tool 3 may be provided. You may provide in both the outer tool 3 side and the inner tool 5 side.
Further, in the above-described embodiment, the case where the first deformation allowing portion D1 and the second deformation allowing portion D2 are configured using an O-ring as an elastic member has been described. However, instead of this, a spring or a fluid damper is used. You may comprise a deformation | transformation permission part by.

  It is possible to provide a method for forming a pill fur proof cap and an apparatus for forming a pill fur proof cap, which can secure the rigidity and forming accuracy of a thread forming scheduled portion and a skirt portion and can perform stable forming.

In embodiment of this invention, it is a conceptual diagram which shows a mode that a knurl part, a slit part, etc. are shape | molded by the cap 11. As shown in FIG. In embodiment of this invention, it is a figure which shows a mode that the surrounding wall part 11a of the cap 11 is shape | molded by the outer tool 3 and the inner tool 5. FIG. (A) is the detail of the 1st deformation | transformation permission part D1 of the inner tool 5 in FIG. 2, (b) is a figure which shows the detail of the 2nd deformation | transformation permission part D2 of the inner tool 5 in FIG. In embodiment of this invention, it is a figure which shows a mode that shaping | molding was completed and the inner tool 5 was spaced apart from the surrounding wall part 11a. It is a conceptual diagram which shows a mode that a knurled part, a slit part, etc. are shape | molded by the conventional shaping | molding apparatus 101 at the cap 11. FIG. It is a figure which shows a mode that the surrounding wall part 11a of the cap 11 is shape | molded by the outer tool 3 and the inner tool 105 in the conventional shaping | molding apparatus 101. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding device 3 Outer tool 3a Outer periphery forming part 3d 1st outer periphery holding surface 3k 2nd outer periphery holding surface 5 Inner tool 5a Inner periphery forming part 5e 1st inner periphery holding surface 5m 2nd inner periphery holding surface 9a 1st 1 inner annular member 9b first outer annular member 9c first outer peripheral recess 9d first inner peripheral wall surface 9e first O-ring 11 cap material 11a peripheral wall portion 11k thread forming portion 11m skirt portion 21a second inner side Annular member 21b Second outer annular member 21c Second outer peripheral recess 21d Second inner peripheral wall surface 21e Second O-ring D1 First deformation allowable part D2 Second deformation allowable part

Claims (6)

A cap member having a top plate portion and a peripheral wall portion suspended from the peripheral edge of the top plate portion is rolled, and the peripheral wall portion is sandwiched between the outer tool and the inner tool, and the peripheral wall portion extends over the entire circumference. By applying the forming process, it is easy to break with a plurality of slit portions that are continuously connected to at least the screw forming portion and the lower end portion of the screw forming portion, and are recessed inward in the radial direction via the bridge. A method for forming a cap for pilfer proof that forms a portion and a skirt portion provided continuously to the lower end portion of the easily breakable portion,
When forming the thread forming scheduled portion, the outer tool and the inner tool allow the outer and inner surfaces of the peripheral wall portion to form the thread forming planned portion over the entire region in the axial direction of the cap material. A method for forming a cap for pilfer proof, characterized by pressing in the thickness direction. A cap member having a top plate portion and a peripheral wall portion suspended from the peripheral edge of the top plate portion is rolled, and the peripheral wall portion is sandwiched between the outer tool and the inner tool, and the peripheral wall portion extends over the entire circumference. By applying the forming process, it is easy to break with a plurality of slit portions that are continuously connected to at least the screw forming portion and the lower end portion of the screw forming portion, and are recessed inward in the radial direction via the bridge. A method for forming a cap for pilfer proof that forms a portion and a skirt portion provided continuously to the lower end portion of the easily breakable portion,
When forming the skirt portion, the outer tool and the inner tool allow the inner and outer surfaces of the peripheral wall portion to form the skirt portion to extend in the thickness direction over the entire area in the axial direction of the cap material. A method for forming a cap for pilfer proof, wherein the cap is pressed against the cap.   When forming the skirt portion, the outer tool and the inner tool allow the inner and outer surfaces of the peripheral wall portion to form the skirt portion to extend in the thickness direction over the entire area in the axial direction of the cap material. The method for forming a cap for pilfer proof according to claim 1, wherein the cap is pressed against the cap. A cap member having a top plate portion and a peripheral wall portion suspended from the peripheral edge of the top plate portion is rolled, and the peripheral wall portion is sandwiched between the outer tool and the inner tool, and the peripheral wall portion extends over the entire circumference. By applying the forming process, it is easy to break with a plurality of slit portions that are continuously connected to at least the screw forming portion and the lower end portion of the screw forming portion, and are recessed inward in the radial direction via the bridge. A pilfer proof cap forming apparatus for forming a portion and a skirt portion provided continuously to a lower end portion of the easily breakable portion,
The thread forming part is formed by the cap material being sandwiched in the thickness direction by the first outer peripheral holding surface of the outer tool and the first inner peripheral holding surface of the inner tool. ,
At least one of the first outer peripheral holding surface and the first inner peripheral holding surface is supported by the first deformation permitting portion so as to be movable in the radial direction,
A molding apparatus for a cap for a pilfer proof, wherein the first deformation allowing portion is elastically deformed in a radial direction when the thread forming portion is formed. A cap member having a top plate portion and a peripheral wall portion suspended from the peripheral edge of the top plate portion is rolled, and the peripheral wall portion is sandwiched between the outer tool and the inner tool, and the peripheral wall portion extends over the entire circumference. By applying the forming process, it is easy to break with a plurality of slit portions that are continuously connected to at least the screw forming portion and the lower end portion of the screw forming portion, and are recessed inward in the radial direction via the bridge. A pilfer proof cap forming apparatus for forming a portion and a skirt portion provided continuously to a lower end portion of the easily breakable portion,
The skirt portion is formed by the cap material being sandwiched in the thickness direction between the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool,
At least one of the second outer peripheral holding surface and the second inner peripheral holding surface is supported by the second deformation allowing portion so as to be movable in the radial direction,
In forming the skirt portion, the second deformation-permitting portion is elastically deformed in the radial direction. The skirt portion is formed by the cap material being sandwiched in the thickness direction between the second outer peripheral holding surface of the outer tool and the second inner peripheral holding surface of the inner tool,
At least one of the second outer peripheral holding surface and the second inner peripheral holding surface is supported by the second deformation allowing portion so as to be movable in the radial direction,
5. The apparatus for forming a cap for a pilfer proof according to claim 4, wherein, when the skirt portion is formed, the second deformation allowing portion is elastically deformed in a radial direction.

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