JP6823536B2 - Manufacturing equipment and manufacturing method for pilfer proof caps - Google Patents

Description

The present invention relates to a manufacturing apparatus and a manufacturing method for a pilfer proof cap that seals a container for beverages and the like.

As a cap to be attached to a container made of steel, aluminum alloy, etc., a plurality of slits formed at a predetermined interval in the circumferential direction of the cap at the lower end of the skirt portion hanging from the peripheral edge of the top surface portion and adjacent slits. A pilfer proof cap with a bridge located between them is known. These slits and bridges are formed between the upper bead and the lower bead formed in the circumferential direction on the skirt portion of the cap. The pilfer proof cap is attached by locking the lower end of the cap (skirt part) to the bulging part of the container mouth, and the bridge is divided when the cap is opened, so that it is more than the bridge. Only the part located above is removed from the container, leaving the part below the bridge in the container.

For such a pilfer-proof cap, for example, as described in Patent Document 1, a cap material (cap) obtained by molding an aluminum alloy plate or the like into a cup shape is formed, and a plurality of slits and a plurality of slits are formed in the cap material. Manufactured by forming a plurality of bridges and the like. Further, these a plurality of slits and a plurality of bridges are formed between an outer tool in which a plurality of cutting edge portions are formed at intervals in the circumferential direction and an inner tool fitted to the inner peripheral surface of the cap material. It is formed by sandwiching the cap material and rolling the cap material together with the inner tool along the outer tool.

Japanese Unexamined Patent Publication No. 2011-143973 JP-A-2015-81115

By the way, as described in Patent Document 2, in order to process the cap material (cap body) into the skirt portion (cylindrical portion) without leaving a gap on the entire circumference of the skirt portion, molding is started. It is processed so that the molding start end and the molding end at the end of molding overlap. For this reason, an overlap portion (double processed portion) in which slits and the like are doubly processed is formed in a part of the skirt portion of the cap material.

However, when the skirt portion is processed in order in the circumferential direction, the cap height (the axial length of the skirt portion) changes (shrinks) with the molding of the skirt portion, so that the molding start end and the molding end The processing position may deviate from the portion, and elongated burrs and whiskers may be formed in the overlap portion. When such burrs and whiskers occur, the opening person may feel uncomfortable when opening the capped container.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an apparatus for producing a pilfer proof cap capable of suppressing the generation of burrs and whiskers in an overlapping portion, and a method for producing the same.

The apparatus for manufacturing a pilfer proof cap of the present invention is arranged alternately on the skirt portion of a cap body having a top surface portion and a skirt portion substantially hung from the peripheral edge of the top surface portion in the circumferential direction of the skirt portion. It is a device for manufacturing a pilfer proof cap in which a plurality of slits and a plurality of bridges are formed, and has a first cutting edge portion, and has a top surface portion and a cylindrical portion serving as the skirt portion. The inner tool has an inner tool that fits inside the cap material, and a plurality of second cutting edge portions that are arranged at intervals in the axial direction of the cylindrical portion from the first cutting edge portion. An outer tool that sandwiches the cylindrical portion between the two, forms the slit between the first cutting edge portion and the second cutting edge portion while processing the cylindrical portion, and forms the skirt portion. The first cutting edge portion and the plurality of the second cutting edge portions are formed into the cylindrical portion by rolling the cap material together with the inner tool from the start end side to the end side of the outer tool by one or more turns. The cylindrical portion is intermittently cut between the first cutting edge portion and the plurality of second cutting edge portions to form a plurality of the slits so as to form a plurality of the second cutting edges. Of the cutting edge portions, the start end portion of the start end side second cutting edge portion arranged on the start end side of the outer tool and the end portion of the end side second cutting edge portion arranged on the end side of the outer tool. Therefore, a part of the slits is processed so as to be overlapped in the circumferential direction, and the axial distance between the end portion of the second cutting edge portion on the terminal side and the first cutting edge portion is the starting end. It is formed to be smaller than the axial distance between the start end portion of the side second cutting edge portion and the first cutting edge portion.

When a part of the slit is overlapped in the circumferential direction by the start end portion of the second cutting edge portion on the start end side and the end portion of the second cutting edge portion on the termination side, the end portion of the second cutting edge portion on the termination side is started. By arranging the first cutting edge portion closer to the first cutting edge portion than the starting end portion of the second cutting edge portion on the side, the height position of the cylindrical portion in the axial direction changes as the machining to the cylindrical portion progresses. Also, a slit machined by the end portion of the second cutting edge portion on the termination side and the first cutting edge portion at the start end portion of the slit machined by the start end portion of the second cutting edge portion on the start end side and the first cutting edge portion. The machining position of the end part of the can be adjusted. Therefore, in the overlap portion of the slits, the end portion of the slit to be machined last can be machined to match the substantially same height position of the start end portion of the slit machined first, and the end portion is continuously formed at the start end portion. Therefore, it is possible to suppress the formation of burrs and whiskers in the overlapping portion of the slit processed by the second cutting edge portion on the start end side and the second cutting edge portion on the end end side.

In this way, the axial distance between the end portion of the second cutting edge portion on the end side and the first cutting edge portion is set to the axial distance between the start end portion and the first cutting edge portion of the second cutting edge portion on the start end side. In order to form the size smaller than that, only the end portion of the end side second cutting edge portion of the plurality of second cutting edge portions may be arranged close to the first cutting edge portion, or the start end side first portion may be arranged. 2 Only the starting end portion of the cutting edge portion may be arranged away from the first cutting edge portion.

In the pilfer proof cap manufacturing apparatus of the present invention, the axial distance between the first cutting edge portion and the second cutting edge portion is gradually reduced from the start end side to the end side of the outer tool. Good.

The axial distance between the first cutting edge and the second cutting edge is formed small from the start end side to the end side of the outer tool, and the axial distance between the first cutting edge and the second cutting edge is gradually increased. By narrowing the slits to, a plurality of slits formed in the circumferential direction of the skirt portion of the cap body can be continuously formed by gradually changing the height position along the circumferential direction. Therefore, the bridge formed between the slits can be formed to have a uniform width in the circumferential direction of the skirt portion.

In the method for manufacturing a pilfer proof cap of the present invention, the skirt portion of a cap body having a top surface portion and a skirt portion substantially hung from the peripheral edge of the top surface portion is alternately arranged in the circumferential direction of the skirt portion. A method for manufacturing a pilfer-proof cap in which a plurality of slits and a plurality of bridges are formed, the cap material having a first cutting edge portion and having a top surface portion and a cylindrical portion serving as the skirt portion. It has an inner tool that fits inside the tool and a plurality of second cutting edge portions that are arranged at intervals from the first cutting edge portion in the axial direction of the cylindrical portion, and is between the inner tool. Using an outer tool that sandwiches the cylindrical portion, forms the slit between the first cutting edge portion and the second cutting edge portion while processing the cylindrical portion, and forms the skirt portion. By rolling the cap material together with the inner tool from the start end side to the end side of the outer tool by one or more turns, the first cutting edge portion and the plurality of second cutting edge portions are brought into the radial direction of the cylindrical portion. The cylindrical portion is cut between the first cutting edge portion and the plurality of second cutting edge portions to form the plurality of slits, and among the plurality of the second cutting edge portions. One of the slits by the start end portion of the start end side second cutting edge portion arranged on the start end side of the outer tool and the end portion of the end side second cutting edge portion arranged on the end side of the outer tool. It has a slit forming step of laminating the portions in the circumferential direction, and in the slit forming step, the axial distance between the end portion of the second cutting edge portion on the terminal side and the first cutting edge portion is set. It is formed to be smaller than the axial distance between the start end portion of the second cutting edge portion on the start end side and the first cutting edge portion.

In the method for manufacturing a pilfer proof cap of the present invention, the axial distance between the first cutting edge portion and the second cutting edge portion is gradually reduced from the start end side to the end side of the outer tool. Good.

According to the present invention, since the height position in the axial direction of the start end portion of the slit formed first and the end portion of the slit formed last can be aligned, burrs and whiskers can be aligned in the overlap portion of the slits. Can be suppressed from being formed.

It is a top view which shows typically the inner tool and the outer tool which constitute the manufacturing apparatus of the pilfer proof cap of 1st Embodiment of this invention. It is a cross-sectional view of a main part along the line AA of FIG. 1 explaining the positional relationship between the cap material before the start of molding and the inner tool and the outer tool in the first embodiment. It is sectional drawing of the main part along the line BB of FIG. 1 explaining the positional relationship between the cap material during formation of an upper bead and a lower bead in 1st Embodiment, and an inner tool and an outer tool. FIG. 5 is a cross-sectional view of a main part along the line CC of FIG. 1 for explaining the positional relationship between the cap material during slit formation in the first embodiment and the inner tool and the outer tool. It is sectional drawing of the main part along the DD line of FIG. 1 explaining the positional relationship between the cap material of the slit formation start position (the start end portion of a slit) of 1st Embodiment, and an inner tool and an outer tool. It is sectional drawing of the main part along the line EE of FIG. 1 explaining the positional relationship between the cap material of the slit formation end position (the end part of a slit) in 1st Embodiment, and an inner tool and an outer tool. It is sectional drawing of the main part explaining the positional relationship between the cap material, the inner tool and the outer tool at the same position as FIG. 4, and shows the state just before the outer tool moves inward in the radial direction and cuts a cylindrical part. .. FIG. 6 is a cross-sectional view of a main part for explaining the positional relationship between the cap material and the inner tool and the outer tool at the same positions as in FIG. 6, showing a state immediately before the outer tool moves inward in the radial direction to cut the cylindrical part. .. It is a developed view of the 2nd cutting edge part of the outer tool seen from the F arrow view direction shown in FIG. It is a development view of the main part of the outer peripheral surface of the cylindrical part of the cap material at the slit formation start position in the process of processing a slit and a bridge. It is a side view which broke half of the pilfer proof cap formed by the manufacturing method of embodiment of this invention. It is a side view which broke half of the cap material. It is a side view which broke half of the cap material which formed the upper bead and the lower bead. It is a top view which shows typically the inner tool and the outer tool which constitute the manufacturing apparatus of the pilfer proof cap of the 2nd Embodiment of this invention. FIG. 5 is a cross-sectional view of a main part along the GG line of FIG. 14 for explaining the positional relationship between the inner tool and the outer tool of the cap material during slit formation in the second embodiment. It is a development view of the 2nd cutting edge part of the outer tool of 2nd Embodiment, and is the development view of the 2nd cutting edge part corresponding to FIG. 9 of 1st Embodiment. It is a developed view of the 2nd cutting edge part corresponding to FIG. 16 of the outer tool used in the manufacturing method of embodiment of this invention.

Hereinafter, embodiments of the pilfer proof cap manufacturing apparatus and manufacturing method of the present invention will be described with reference to the drawings.

FIG. 11 shows the pilfer proof cap 3 (also referred to as PP cap) manufactured in the present embodiment, and shows the state before mounting the container. The pilfer proof cap 3 is attached to the mouth of a container such as a bottle can made of aluminum or an aluminum alloy (metal) having a diameter of 38 mm, and seals the mouth.

As shown in FIG. 11, the pilfer-proof cap 3 has a cap body 4 formed by molding an aluminum or aluminum alloy plate having a painted inner and outer surfaces into a cup shape, and a liner 5 provided on the inner surface of the cap body 4. And. Further, when the pilfer proof cap 3 is attached to the mouth of the container, the upper 48 (top surface 41 and skirt) of the cap body 4 is screwed into a male screw portion (not shown) formed at the mouth of the container. The upper portion 43 of the cylinder of the portion 42) and the lower portion 49 of the cap body 4 (the lower portion 44 of the cylinder of the skirt portion 42) locked to the bulging portion (not shown) formed at the mouth of the container are connected by the bridge 22. It has a linked pilfer proof function.

The cap body 4 includes a disk-shaped top surface portion 41 and a cylindrical skirt portion 42 substantially hanging from the peripheral edge of the top surface portion 41 along the axial direction O. As shown in FIG. 11, the skirt portion 42 of the cap body 4 has a knurled recess 11, an opening 12, a hook portion 13, and an upper groove portion 14a in this order from the base end side to the tip end side on the top surface portion 41 side. A female screw forming portion 15, a lower groove portion 14b, an upper bead 16, a slit 21, a bridge 22, a lower bead 17, and a hem portion 18 are formed. Of these, the upper groove portion 14a, the female thread forming portion 15, the lower groove portion 14b, the upper bead 16, the lower bead 17, and the hem portion 18 are continuously formed along the circumferential direction of the skirt portion 42 over the entire circumference. There is.

A plurality of slits 21 formed between the upper bead 16 and the lower bead 17 are intermittently formed in the circumferential direction of the skirt portion 42 by making cuts along the circumferential direction of the skirt portion 42. Further, the bridge 22 is formed between the adjacent slits 21, and the plurality of slits 21 and the plurality of bridges 22 are alternately arranged in the circumferential direction of the skirt portion 42. Then, the upper cylinder upper 43 of the skirt portion 42 and the lower cylinder 44 of the lower portion of the skirt portion 42 are connected via the bridge 22.

Of these, the lower portion 44 of the cylinder is locked to the bulging portion when the pilfer proof cap 3 is attached to the mouth portion of the container as described above. Further, the upper portion 43 of the cylinder is screwed into the male screw portion of the container when the pilfer proof cap 3 is attached to the mouth portion of the container. Then, when the upper portion 48 of the cap body 4 is rotated in the circumferential direction of the skirt portion 42 (the direction in which the screw is released) with the pilfer proof cap 3 attached to the container, the lower portion 44 of the cylinder expands. Since it is locked to the protruding portion, the bridge 22 is broken and the upper portion 43 of the cylinder is separated from the lower portion 44 of the cylinder. Then, the upper portion 48 (top surface portion 41 and the cylinder upper portion 43) of the cap body 4 is removed from the container, and the cylinder lower portion 44 is left in the container.

A plurality of knurled recesses 11 and hook portions 13 formed in the upper portion 43 of the cylinder are formed at intervals in the circumferential direction of the skirt portion 42, and the skirt portion is formed by the knurled recesses 11 and the hook portion 13. An uneven surface is formed on the outer peripheral surface of 42. By forming an uneven surface on the outer peripheral surface of the skirt portion 42 in this way, when the pilfer proof cap 3 is rotated in the circumferential direction to open the container, the finger holding the pill fur proof cap 3 is used. The frictional resistance between them can be increased, and the pilfer proof cap 3 can be easily rotated to open the cap.

Further, the hook portion 13 is formed by pushing the upper portion of the notch formed intermittently along the circumferential direction of the skirt portion 42 inward in the radial direction, and the opening 12 is formed by opening the notch. ing. The opening 12 functions as a vent hole for releasing the gas inside the container to the outside and releasing the internal pressure when the pilfer proof cap 3 is rotated during opening. Further, the tip position of the hook portion 13 is arranged inward in the radial direction with respect to the outer diameter of the liner 5, and the outer peripheral portion of the liner 5 is arranged between the hook portion 13 and the inner surface of the top surface portion 41. The liner 5 is attached to the cap body 4 as supported by.

The liner 5 shown in FIG. 11 has a multi-layer structure composed of a sliding layer 51 and a sealing layer 52. Of these, the sliding layer 51 is arranged on the inner surface side of the top surface portion 41 of the cap body 4, is formed in a disk shape by polypropylene or the like, and is slidably formed on the inner surface of the top surface portion 41. Further, the sealing layer 52 is formed of an elastomer resin or the like softer than the sliding layer 51, and is configured to come into contact with the mouth of the container when the cap is closed so that the inside of the container can be sealed. Further, in FIG. 11, the sealing layer 52 is composed of an annular and thick sealing portion 54 that is in close contact with the mouth portion and a thin portion 55 that is formed inside the sealing portion 54 and is thinner than the sealing portion 54. ing.

Next, the apparatus and method for manufacturing the pilfer proof cap of the first embodiment, which manufactures the pilfer proof cap 3 in which the plurality of slits 21 and the plurality of bridges 22 are formed in the circumferential direction of the skirt portion 42 in this way. Will be described.

In the method for manufacturing a pilfer proof cap according to the first embodiment, as shown in FIG. 12, a disk-shaped top surface portion 41 and a cylindrical cylindrical portion 42A formed by hanging straight from the peripheral edge of the top surface portion 41. A bead forming step of forming the upper bead 16 and the lower bead 17 on the cylindrical portion 42A of the cap material 4A using the cap material 4A having the above, and the upper bead 16 and the lower bead 17 are formed as shown in FIG. The cap material 4B is provided with a slit forming step of forming a plurality of slits 21 and a plurality of bridges 22. Then, in the method for manufacturing a pilfer proof cap according to the first embodiment, as shown in FIG. 1, a pilfer proof cap manufacturing apparatus 101 having a movable inner tool 6 and a fixed outer tool 7A (hereinafter referred to as “Pilfer proof cap”). , The manufacturing apparatus 101), the bead molding step and the slit molding step are continuously performed, and as shown in FIG. 11, a pilfer proof cap 3 having a slit 21 and a bridge 22 is manufactured.

In the following description, regarding the cap body 4 in which the slit 21 and the bridge 22 are formed, the state before bead molding, that is, as shown in FIG. 12, the upper bead 16, the lower bead 17, the slit 21 and the bridge 22 are The state before being formed is referred to as a cap material 4A, and the portion of the cap material 4A that becomes the skirt portion 42 is referred to as a cylindrical portion 42A. Further, the state before the slit forming step, that is, the state after the bead forming step in which the upper bead 16 and the lower bead 17 are formed and before the slit 21 and the bridge 22 are formed, as shown in FIG. The cap material 4B is used, and the portion of the cap material 4B that becomes the skirt portion 42 is a cylindrical portion 42B.

(Overall configuration of pilfer proof cap manufacturing equipment)
As described above, the manufacturing apparatus 101 includes an inner tool 6 on the movable side and an outer tool 7A on the fixed side. As shown in FIG. 1, the cap material 4A and the cap material 4B are commonly fitted to the inner tool 6 on the movable side. The outer peripheral surface 70A of the outer tool 7A has a first region 81 for processing the upper bead 16 and the lower bead 17 on the cap material 4A, and a slit 21 and a slit 21 on the cap material 4B on which the upper bead 16 and the lower bead 17 are formed. A second region 82 for processing the bridge 22 is provided, and the second region 82 is continuously arranged in the first region 81. Further, both the first region 81 and the second region 82 are formed with a peripheral length capable of rolling the inner tool 6 one or more rotations.

Then, the manufacturing apparatus 101 sandwiches the cylindrical portion 42A of the cap material 4A between the inner tool 6 and the first region 81 of the outer tool 7A, and the cap material 4A and the inner tool 6 are the first of the outer tool 7A. By rolling from the start end side to the end side of the region 81, the cylindrical portion 42A is sequentially processed in the circumferential direction along with the rotational movement of the cap material 4A, and the cylindrical portion 42B is formed. Further, following the molding of the cylindrical portion 42B, the cap material 4B and the inner tool 6 are rolled from the start end side to the end side of the second region 82 of the outer tool 7A to accompany the rotational movement of the cap material 4B. The cylindrical portion 42B is sequentially processed in the circumferential direction to form the skirt portion 42 in which the slit 21 and the bridge 22 are formed.

Further, in the manufacturing apparatus 101, in the first region 81 of the outer tool 7A, a part of the cylindrical portion 42A of the cap material 4A in the circumferential direction is processed so as to overlap the upper bead 16 and the lower bead 17 with the cylindrical portion 42B. It is processed continuously without leaving a gap around the entire circumference of. Further, in the second region 82 of the outer tool 7A, the slit 21 and the bridge 22 are intermittently formed along the circumferential direction by processing a part of the cylindrical portion 42B of the cap material 4B in the circumferential direction in an overlapping manner. , The entire circumference of the skirt portion 42 is processed without leaving a gap. Note that FIG. 1 schematically shows a series of states during molding of the cap materials 4A and 4B, and a plurality of inner tools 6 and cap materials 4A and 4B are shown on the drawing.

2 to 6 are cross-sectional views taken along the line AA, BB, CC, DD, and EE in FIG. 1, and the cap material 4A and the cap material 4B are taken. It is a figure which showed the state at the time of molding together with the inner tool 6 and the outer tool 7A of the manufacturing apparatus 101, respectively. Further, FIG. 7 is a cross-sectional view of a main part for explaining the positional relationship between the cap material 4B and the inner tool 6 and the outer tool 7A at the same positions as in FIG. 4, as the inner tool 6 and the cap material 4B roll. , The state immediately before the outer tool 7A moves inward in the radial direction of the cylindrical portion 42B and cuts the cylindrical portion 42B is shown. Further, FIG. 8 is a cross-sectional view of a main part for explaining the positional relationship between the cap material 4B and the inner tool 6 and the outer tool 7A at the same positions as in FIG. 6, and is shown as a rolling of the inner tool 6 and the cap material 4B. , The state immediately before the outer tool 7A moves inward in the radial direction of the cylindrical portion 42B and cuts the cylindrical portion 42B is shown. FIG. 9 is a developed view of the outer peripheral surface 70 of the outer tool 7A as seen from the direction of arrow F in FIG. Further, FIG. 10 is a development view of a main part of the outer peripheral surface of the cylindrical portion 42B of the cap material 4B at the slit formation start position during the processing of the slit 21 and the bridge 22.

In the manufacturing apparatus 101, the inner tool 6 is fitted from the upper side of the cap material 4A with the top surface portion 41 of the cap material 4A arranged on the lower side and the opening (tip portion) of the cylindrical portion 42A arranged on the upper side. It has become like. Therefore, in FIGS. 2 to 10, only the vicinity of the tip portion of the cylindrical portion 42A and the cylindrical portion 42B is shown, but in both cases, the top surface portion 41 side of the cap members 4A and 42B is located on the lower side, and the cylindrical portion 42A. , The figure shows that the tip side of 42B is located on the upper side. In the following description, the same direction as the orientation with respect to the paper surface in FIGS. 2 to 10 will be described in the upward and downward directions.

(Inner tool configuration)
The inner tool 6 on the movable side is formed by laminating a plurality of ring-shaped plates 61 to 63 as shown in FIGS. 2 to 4, and is formed in a cylindrical shape as a whole as shown in FIG. As shown in FIGS. 2 to 4, the inner tool 6 has an inner lower bead plate 61 for forming a lower bead 17 on a cylindrical portion 42A and an inner for forming an upper bead 16 on a cylindrical portion 42A with the outer tool 7A. It includes at least an upper bead plate 62.

Reference numeral 63 in FIGS. 2 to 4 indicates an inner intermediate plate laminated on the inner bead plate 62. Although not shown, the inner tool 6 is configured by sequentially laminating a plurality of plates for forming a knurl recess 11, a hook portion 13, an upper groove portion 14a, and the like, in addition to the inner intermediate plate 63.

As shown in FIGS. 2 to 4, the outer peripheral surface of the inner lower bead plate 61 constituting the inner tool 6 has a lower bead forming convex portion 612 for forming the lower bead 17 and an inner side hem for forming the hem 18. The forming portion 611 and the slit relief groove portion 617 forming a space capable of accommodating the second cutting edge portions 725a to 725c in the second region 82 of the outer tool 7A described later are continuously provided along the circumferential direction over the entire circumference. It is formed.

As shown in FIGS. 2 to 6, the lower bead forming convex portion 612 has a substantially triangular shape in vertical cross-sectional view, and has a convex shape protruding outward in the radial direction, and has a convex shape protruding outward in the radial direction. Between the first inclined surface 613 having a downward slope slope, the second inclined surface 614 having a downward slope inward in the radial direction, and these first inclined surface 613 and the second inclined surface 614. It has an arcuate top 615 (see FIGS. 2, 5 and 6) to connect. Then, the lower bead 17 is formed by pressing the inner surface of the cylindrical portion 42A by the top portion 615 located at the outermost outer peripheral end of the lower bead forming convex portion 612. Further, the lower end of the second inclined surface 614 is arranged inward in the radial direction from the inner side hem forming portion 611 and the first inclined surface 613, and the lower end surface 616 of the inner lower bead plate 61 has a smaller diameter than the other portions. Is formed in. The slit relief groove portion 617 is formed between the second inclined surface 614, which is largely cut inward in the radial direction, and the upper end surface 621 of the inner upper bead plate 62.

As shown in FIGS. 2 to 4, the outer peripheral surface of the inner upper bead plate 62 is surrounded by a first cutting edge portion 623 for forming the slit 21 and an upper bead forming convex portion 624 for forming the upper bead 16. It is formed continuously along the entire circumference along the direction. The first cutting edge portion 623 is formed on a ridge line between an upper end surface 621 laminated on the lower end surface 616 of the inner lower bead plate 61 and a first surface 622 extending linearly upward. The inner tool 6 is continuously formed around the entire circumference without interruption. Further, an upper bead forming convex portion 624 is formed at a position below the first cutting edge portion 623.

The upper bead forming convex portion 624 has a convex shape protruding radially outward from the first surface 622 forming the first cutting edge portion 623, and as shown in FIG. 2, the upper bead forming convex portion 624 is directed outward in the radial direction. The first inclined surface 625 having a downward slope, the second inclined surface 627 having a downward slope inward in the radial direction, and the first inclined surface 625 and the second inclined surface 627 are connected to each other. It has an arcuate top 626 and. Then, the upper bead 16 is formed by pressing the inner surface of the cylindrical portion 42A by the top portion 626 located at the outermost peripheral edge of the upper bead forming convex portion 624.

(Outer tool configuration)
As shown in FIGS. 2 to 4, the outer tool 7A on the fixed side has a configuration in which a plurality of plates 71A, 72A, 73A are laminated, and as shown in FIG. 1, the outer peripheral surface 60 of the inner tool 6 is formed. It has an outer peripheral surface 70 formed by an arc having a radius of curvature larger than that of the outer peripheral surface 70. As shown in FIGS. 2 to 4, the outer tool 7A includes an outer lower bead plate 71A for forming a lower bead 17 and a hem 18 on a cylindrical portion 42A with the inner tool 6 in the first region 81, and a cylinder. The outer upper bead plate 73A for forming the upper bead 16 in the portion 42A, and the slit 21 and the bridge 22 are provided in the cylindrical portion 42B in the second region 82, which is arranged between the outer lower bead plate 71A and the outer upper bead plate 73A. It includes at least a slit plate 72A to be molded. The outer tool 7A is fixed to the device main body 111 as shown in FIG.

Although not shown, the outer tool 7A is configured by sequentially laminating a plurality of plates for forming the knurl recess 11, the hook portion 13, the upper groove portion 14a, etc., in addition to the plates 71A, 72A, 73A. ..

As shown in FIGS. 2 to 4, the outer lower bead plate 71A is arranged so as to face the inner lower bead plate 61. Further, on the outer peripheral surface of the outer lower bead plate 71A, as shown in FIGS. 3 and 4, a lower bead forming portion 713 for forming the lower bead 17 and an outer hem forming portion 711 for forming the hem portion 18 are formed. , Are continuously formed in the first region 81 and the second region 82 over the entire area along the circumferential direction. As shown in FIGS. 3 and 4, the lower bead forming portion 713 connects the outer side hem forming portion 711 and the lower end surface 712 laminated on the upper end surface 728 of the slit plate 72A in a vertical cross-sectional view. It is formed in an arc shape. The lower bead forming portion 713 is arranged slightly above the lower bead forming convex portion 612 of the inner lower bead plate 61.

The outer upper bead plate 73A is arranged so as to face both the inner upper bead plate 62 and the inner intermediate plate 63 of the inner tool 6. Further, on the outer peripheral surface of the outer upper bead plate 73A, as shown in FIGS. 3 and 4, an upper bead forming portion 733 for forming the upper bead 16 is continuous with the first region 81 and the second region 82. It is formed over the entire area along the circumferential direction. As shown in FIGS. 3 and 4, the upper bead forming portion 733 is located between the outer peripheral surface 731 of the outer upper bead plate 73A and the upper end surface 732 laminated on the lower end surface 729 of the slit plate 72A in a vertical cross-sectional view. It is formed in an arcuate shape to connect the two, and is arranged slightly below the top 626 of the upper bead forming convex portion 624 of the inner upper bead plate 62.

As shown in FIGS. 3 and 4, the slit plate 72A is arranged so as to face both the inner lower bead plate 61 and the inner upper bead plate 62. Further, the outer peripheral surface of the slit plate 72A is formed in a different shape in the first region 81 and the second region 82.

In the first region 81, as shown in FIG. 3, the first lower bead accommodating portion 742A arranged to face the lower bead forming convex portion 612 of the inner lower bead plate 61 and the slit relief of the inner lower bead plate 61. The bent portion forming convex portion 811 arranged to face the groove portion 617 (second inclined surface 614) and the first upper bead accommodating portion 743A arranged to face the upper bead forming convex portion 624 of the inner upper bead plate 62. And are continuously formed over the entire area along the circumferential direction.

Further, as shown in FIG. 3, the bent portion forming convex portion 811 is formed so as to project outward in the radial direction of the slit plate 72A. In this case, the bent portion forming convex portion 811 is formed in a substantially triangular shape in a vertical cross-sectional view, and has a first inclined surface 812 that inclines upward in the radial direction and an inward direction in the radial direction. It has a second inclined surface 813 that inclines upward, and an arcuate top 814 that connects between the first inclined surface 812 and the second inclined surface 813.

Further, the upper end of the second inclined surface 813 is arranged radially inward with respect to the outer peripheral surface of the first inclined surface 812 and the outer bead plate 71A, and the upper end surface 728 of the slit plate 72A is larger than the other portions. It is formed with a small diameter. The first lower bead accommodating portion 742A is formed between the second inclined surface 813, which is largely cut inward in the radial direction, and the lower end surface 712 of the outer lower bead plate 71A. The first lower bead accommodating portion 742A is arranged away from the outer surface of the cylindrical portion 42A when the cylindrical portion 42A is sandwiched between the inner tool 6 and the first region 81 of the outer tool 7A.

Further, the first upper bead accommodating portion 743A is formed between the first inclined surface 812 and the upper end surface 732 of the outer upper bead plate 73A, and is formed between the base end of the first inclined surface 812 and the lower end surface of the slit plate 72A. It is connected to the 729 by a flat surface 721 extending linearly upward. The flat surface 721 is arranged inward in the radial direction with respect to the outer peripheral surface of the outer bead plate 73A. The first upper bead accommodating portion 743A is arranged away from the outer surface of the cylindrical portion 42A when the cylindrical portion 42A is sandwiched between the inner tool 6 and the first region 81 of the outer tool 7A.

In the second region 82, as shown in FIGS. 4 to 8, a second lower bead accommodating portion 742B arranged to face the lower bead forming convex portion 612 of the inner lower bead plate 61 and an inner lower bead plate 61. 722a to 722c of projecting pieces arranged to face the slit relief groove portion 617 (second inclined surface 614) of the inner and the second upper bead accommodating arranged to face the upper bead forming convex portion 624 of the inner upper bead plate 62. A portion 743B and a portion 743B are formed.

As shown in FIGS. 1 and 9, each of the protruding pieces 722a to 722c is formed intermittently along the circumferential direction of the outer peripheral surface of the slit plate 72A, and the slit plate 72A has a plurality of protruding pieces 722a to 722c. It is arranged. Each of the protruding pieces 722a to 722c has a second cutting edge portion 725a to 725c that cuts the cylindrical portion 42B with the first cutting edge portion 623. In this case, a total of 11 projecting pieces 722a to 722c are provided, and the projecting pieces 722a on the starting end side arranged on the starting end side of the second region 82 of the outer tool 7A and the protruding pieces 722a arranged on the terminal side of the second region 82. The terminal-side projecting piece 722c to be formed has a shorter peripheral length than the nine projecting pieces 722b arranged between them.

Further, the protruding pieces 722a to 722c are arranged at intervals of a peripheral length corresponding to the width of the bridge 22, and the bridge 22 is not contacted between the adjacent protruding pieces 722a to 722c when the slit 21 is formed. A bridge accommodating portion 741 for accommodating is formed. In this case, as shown in FIGS. 4 to 6, the projecting pieces 722a to 722c are formed in the shape of a thin, substantially triangular wedge in a vertical cross-sectional view, and are first extending linearly outward in the radial direction. A surface 723, a second surface 724 extending linearly upward, an inclined surface 726 inclined upward in the radial direction, and a second surface 724 and an inclined surface 726 are connected to each other. It has an arcuate convex surface portion 727 and. The second cutting edge portions 725a to 725c are formed on the ridge line between the first surface 723 and the second surface 724, and the second cutting edge portions 725a to 725c and the second surface 724 are protruding pieces. It is arranged at the tip (outermost diameter position) of 722a to 722c. Further, the adjacent second cutting edge portions 725a to 725c are arranged by the bridge accommodating portion 741 at intervals of a peripheral length corresponding to the width of the bridge 22, like the protruding pieces 722a to 722c.

Further, as shown in FIGS. 4 to 8, the second cutting edge portions 725a to 725c are arranged at intervals in the axial direction O of the cylindrical portion 42B from the first cutting edge portion 623 of the inner tool 6. There is. Further, as shown in FIG. 9 by a two-dot chain line at the position where the first cutting edge portion 623 of the inner tool 6 moves, each of the second cutting edge portions 725a to 725c is located above the first cutting edge portion 623. It is arranged. The second cutting edge portions 725a to 725c can be accommodated in the slit relief groove portion 617 of the inner tool 6 when the cylindrical portion 42B is sandwiched between the inner tool 6 and the second region 82 of the outer tool 7A. By intersecting the first cutting edge portion 623 and the second cutting edge portions 725a to 725c in the radial direction of the cylindrical portion 42B, the first cutting edge portion 623 and each of the second cutting edge portions 725a to 725c are provided. The cylindrical portion 42B is intermittently cut between the two slits 21 and a plurality of bridges 22 are formed between the slits 21 together with the plurality of slits 21.

Specifically, as shown in FIGS. 4 and 7, the cylindrical portion 42B is pressed from the outer side to the inner side in the radial direction by the second surface 724 and the convex surface portion 727 of the tip portions of the protruding pieces 722a to 722c. As a result, a plurality of slits 21 are formed by cutting (breaking) between the first cutting edge portion 623 and the second cutting edge portions 725a to 725c arranged at the tips of the protruding pieces 722a to 722c.

Further, as described above, in the manufacturing apparatus 101, the cap material 4B is rolled one or more turns from the start end side to the end side of the second region 82 of the outer tool 7A, thereby causing the entire cylindrical portion 42B (skirt portion 42). Machining is performed without leaving a gap in the circumference, and the start end of the start end side second cutting edge portion 725a arranged on the start end side of the second region 82 of the second cutting edge portions 725a to 725c. A part of the slit 21 is overlapped in the circumferential direction of the cylindrical portion 42B by the portion and the terminal portion of the terminal side second cutting edge portion 725c arranged on the terminal side of the second region 82. ing.

In the manufacturing apparatus 101 of the present embodiment, as shown in FIG. 9, the outer tool 7A is arranged so as to be inclined with respect to the rotation direction of the inner tool 6 (rolling direction, circumferential direction of the cylindrical portions 42A and 42B). doing. In this case, by sandwiching the spacer 112 between the apparatus main body 111 and the outer tool 7A on the start end side of the second region 82 of the outer tool 7A, the outer tool 7A is outer from the start end side to the end side of the second region 82. The entire tool 7A is arranged so as to be inclined downward. As a result, the axial distance O of the cylindrical portion 42B between the first cutting edge portion 623 and the second cutting edge portions 725a to 725c gradually decreases from the start end side to the end side of the second region 82 of the outer tool 7A. It is formed. Then, as shown in FIG. 9, the distance Hc in the axial direction O of the cylindrical portion 42B between the terminal portion of the terminal end side second cutting edge portion 725c and the first cutting edge portion 623 is set to that of the starting end side second cutting edge portion 725a. It is formed to be smaller than the distance Ha of the cylindrical portion 42B between the starting end portion and the first cutting edge portion 623 in the axial direction O.

In the manufacturing apparatus 101 of the present embodiment that manufactures the pilfer proof cap 3 mounted on a container having a diameter of 38 mm, for example, the plate thickness of the spacer 112 sandwiched between the apparatus main body 111 and the outer tool 7A is 0.05 mm. It is said that. In this case, when the distance Ha between the start end portion of the start end side second cutting edge portion 725a and the first cutting edge portion 623 is 0.10 mm, the end portion and the first cutting edge portion of the end side second cutting edge portion 725c The distance Hc from 623 is (Ha-0.05) = 0.05 mm. Therefore, the distance Hc between the end portion of the end side second cutting edge portion 725c and the first cutting edge portion 623 is the start end portion of the start end side second cutting edge portion 725a by the plate thickness (0.05 mm) of the spacer 112. It is formed to be smaller than the distance Ha between the first cutting edge portion 623 and the first cutting edge portion 623.

Further, the upper end of the inclined surface 726 of the slit plate 72A is arranged inward in the radial direction with respect to the first surface 723 and the outer peripheral surface of the outer bead plate 71A, and the upper end surface 728 of the slit plate 72A is more than the other portion. Is also formed with a small diameter. The second lower bead accommodating portion 742B is formed between an inclined surface 726 that is largely cut inward in the radial direction and a lower end surface 712 of the outer lower bead plate 71A. The second lower bead accommodating portion 742B is arranged away from the outer surface of the cylindrical portion 42B when the cylindrical portion 42B is sandwiched between the inner tool 6 and the second region 82 of the outer tool 7A. ing.

The second upper bead accommodating portion 743B is formed between the first surface 723 and the upper end surface 732 of the outer upper bead plate 73A, and is formed with the base end of the first surface 723 and the lower end surface 729 of the slip plate 72A. The space is connected by a flat surface 721 extending linearly upward. The flat surface 721 is arranged inward in the radial direction with respect to the outer peripheral surface of the outer bead plate 73A. The second upper bead accommodating portion 743B is arranged away from the outer surface of the cylindrical portion 42B when the cylindrical portion 42B is sandwiched between the inner tool 6 and the second region 82 of the outer tool 7A. It has become.

(Manufacturing method of pilfer proof cap)
Next, a method of manufacturing a pilfer proof cap using the manufacturing apparatus 101 configured as described above will be described. In the method for manufacturing the pilfer proof cap of the present embodiment, as described above, the bead forming step of forming the upper bead 16 and the lower bead 17 on the cylindrical portion 42A of the cap material 4A and the upper bead 16 and the lower bead 17 are formed. A slit forming step of forming a plurality of slits 21 and a plurality of bridges 22 in the cylindrical portion 42B of the cap material 4B is provided.

[Bead molding process]
First, as shown in FIGS. 1 and 2, the inner tool 6 is fitted inside the cap material 4A, and the cap material 4A is moved together with the inner tool 6 toward the outer peripheral surface 70A of the outer tool 7A. Then, as shown in FIG. 1, the cap material 4A is brought into contact with the start end side of the first region 81 of the outer tool 7A, and the cylinder of the cap material 4A is placed between the inner tool 6 and the first region 81 of the outer tool 7A. The part 42A is sandwiched. Then, the cap material 4A is moved together with the inner tool 6 while rolling from the start end side to the end side of the first region 81 of the outer tool 7A. That is, the cap material 4A and the inner tool 6 are rolled from the start end side to the end side of the first region 81 of the outer tool 7A.

As shown in FIG. 3, when the cylindrical portion 42A is sandwiched between the inner tool 6 and the first region 81 of the outer tool 7A, the inner surface of the cylindrical portion 42A becomes the lower bead forming convex portion 612 and the upper bead forming of the inner tool 6. It is pressed by the convex portion 624, and the outer surface of the cylindrical portion 42A is pressed by the lower bead forming portion 713, the bent portion forming convex portion 811 and the upper bead forming portion 733 of the outer tool 7A. As a result, the cylindrical portion 42A is formed with an upper bead 16 and a lower bead 17 projecting outward in the radial direction, and a bent portion projecting inward in the radial direction between the upper bead 16 and the lower bead 17. 19 is formed. Then, as shown in FIG. 13, a cap material 4B having a cylindrical portion 42B on which the upper bead 16, the bent portion 19, and the lower bead 17 are formed is formed.

[Slit molding process]
Subsequently, as shown in FIG. 1, with the inner tool 6 fitted inside the cap material 4B, the inner tool 6 and the cap material 4B are placed from the start end side to the end side of the second region 82 of the outer tool 7A. The skirt portion 42 is formed by rolling it over.

For example, as shown in FIGS. 4 and 7, when the cylindrical portion 42B is sandwiched between the inner tool 6 and the second region 82 of the outer tool 7A, the second surface 724 and the convex surface portion 727 of the tip end portion of the protruding piece 722b are sandwiched. As a result, the bent portion 19 between the upper bead 16 and the lower bead 17 is pressed from the outer to the inward in the radial direction, and the inner surface of the bent portion 19 is pressed against the first cutting edge portion 623. Then, the bent portion 19 is further pressed inward in the radial direction by the protruding piece 722b, so that the first cutting edge portion 623 and the second cutting edge portion 725b intersect in the radial direction, and the first cutting edge portion The cylindrical portion 42B is cut (broken) between the 623 and the second cutting edge portion 725b to form the slit 21. At this time, as shown in FIG. 7, the slit 21 is formed at a substantially intermediate position in the axial direction O between the first cutting edge portion 623 and the second cutting edge portion 725b.

Then, the cylindrical portion 42B is sandwiched between the inner tool 6 and the second region 82 of the outer tool 7A, and as shown in FIG. 1, the cap material 4B is placed from the start end side to the end side of the second region 82 of the outer tool 7A. The first cutting edge portion 623 and the second cutting edge portions 725a to 725c are sequentially intersected with each other in the radial direction of the cylindrical portion 42B by rolling one or more turns. As a result, the cylindrical portion 42B is intermittently cut between the first cutting edge portion 623 and each of the second cutting edge portions 725a to 725c to form a plurality of slits 21 and between the slits 21. The bridge 22 is formed and the skirt portion 42 is formed.

Further, among the plurality of slits 21, the slits 21 arranged in the overlapping portion of the skirt portion 42 are partially peripheralized by the start end side second cutting edge portion 725a and the end end side second cutting edge portion 725c. It is processed by stacking in the direction. That is, as shown in the developed view of the cylindrical portion 42B of FIG. 10, the second cutting edge portion 725c on the ending side overlaps the starting end portion 21a of the slit 21 that is first machined by the second cutting edge portion 725a on the starting end side. By processing the end portion 21c of the slit 21 by the end portion, the end portion 21c is continuously formed at the start end portion 21a, and the start end portion 21a and the end portion 21c are connected to form one slit 21.

More specifically, as the machining to the cylindrical portion 42B progresses, that is, as the cap material 4B is rolled from the start end side to the end side of the second region 82 of the outer tool 7A, the cylindrical portion 42B is machined in the axial direction O. The height position of the cylinder changes. In this case, the height of the cylindrical portion 42B in the axial direction O is reduced, and as shown in FIG. 8, the positions of the start end portion 21a of the slit 21 are also the first cutting edge portion 623 and the start end side second cutting edge portion 725a. It changes to the lower side (top surface portion 41 side) than the intermediate position in the axial direction O between and.

In the manufacturing apparatus 101, the distance between the first cutting edge portion 623 and the second cutting edge portions 725a to 725c in the axial direction O of the cylindrical portion 42A is set from the start end side to the end side of the second region 82 of the outer tool 7A. The distance between the first cutting edge portion 623 and the second cutting edge portions 725a to 725c in the axial direction O is gradually narrowed. Then, as shown in FIGS. 8 and 9, the end portion of the end side second cutting edge portion 725c is arranged closer to the first cutting edge portion 623 than the start end portion of the start end side second cutting edge portion 725a. Then, the end portion of the second cutting edge portion 725c on the end side is arranged at a position corresponding to the amount of contraction of the height of the cylindrical portion 42A in the axial direction O due to machining and the amount of downward movement of the start end portion 21a of the slit 21. ing.

That is, as described above, each slit 21 is formed at a substantially intermediate position in the axial direction O between the first cutting edge portion 623 and each of the second cutting edge portions 725a to 725c, but the second cutting on the starting end side. By arranging the second cutting edge portion 725c on the terminal side closer to the first cutting edge portion 623 than the blade portion 725a, the height of the cylindrical portion 42B in the axial direction O as the machining to the cylindrical portion 42B progresses. Even if the position of the start end portion 21a of the first processed slit 21 changes (descends), the end portion 21c of the slit 21 processed by the second cutting edge portion 725c on the terminal side and the first cutting edge portion 623 is processed. The position (a substantially intermediate position in the axial direction O between the end portion of the second cutting edge portion 725a on the end side and the first cutting edge portion 623) can be aligned with the start end portion 21a of the slit 21. Therefore, as shown in FIG. 10, the end side second cutting edge portion 725c finally aligns with the substantially same height position of the starting end portion 21a of the slit 21 first machined by the starting end side second cutting edge portion 725a. The end portion 21c of the slit 21 to be machined can be machined.

Further, when the end portion 21c of the slit 21 is processed by the end side second cutting edge portion 725a, the start end portion 21a of the slit 21 is already formed by the start end side second cutting edge portion 725a. Therefore, when the end portion 21c of the slit 21 is machined at a position substantially the same height as the start end portion 21a by the first cutting edge portion 623 and the end side second cutting edge portion 725a, the unprocessed portion in front of the start end portion 21a is processed. Only the cylindrical portion 42B of the above is cut. As a result, the end portion 21c is continuously formed at the start end portion 21a, and one slit 21 in which the start end portion 21a and the end end portion 21c are connected is formed. Therefore, it is possible to suppress the formation of burrs and whiskers in the slit 21 of the overlapping portion processed by the second cutting edge portion 725a on the start end side and the second cutting edge portion 725c on the end side.

Further, in the manufacturing apparatus 101 of the present embodiment, the distance between the first cutting edge portion 623 and the second cutting edge portions 725a to 725c in the axial direction O of the cylindrical portion 42B is set from the start end side of the second region 82 of the outer tool 7A. The shape is gradually reduced toward the end side, and the distance between the first cutting edge portion 623 and each of the second cutting edge portions 725a to 725c in the axial direction O is gradually narrowed. Therefore, the circumferential direction of the skirt portion 42 of the cap body 4 is formed. A plurality of slits 21 formed in the above can be continuously formed by gradually changing the height position along the circumferential direction thereof. Therefore, the bridge 22 formed between the slits 21 can be formed into a uniform width and a uniform shape in the circumferential direction of the skirt portion 42.

Further, in the manufacturing apparatus 101, as described above, the outer lower bead plate 71A and the outer upper bead plate 73A are formed in the first region 81 and the second region 82 in the same shape over the entire area, so that in the slit forming step, When forming the slit 21, the upper bead 16 and the lower bead 17 formed in the first region 81 can be supported by the upper bead forming portion 733 and the lower bead forming portion 713. Therefore, when the slit 21 is machined in the slit forming step, the cylindrical portion 42B can be suppressed from being deformed, and the dimension of the skirt portion 42 in the axial direction O can be stabilized.

In the first embodiment described above, the upper bead 16 and the lower bead 17 are formed in advance in the bead forming step, and then the slit 21 and the bridge 22 are formed between the upper bead 16 and the lower bead 17 in the slit forming step. However, these shapes can also be processed at once. Hereinafter, in the slit forming step of forming the slit 21 and the bridge 22, the manufacturing apparatus and manufacturing method of the pilfer proof cap of the second embodiment in which the upper bead 16 and the lower bead 17 are molded at the same time as the slit 21 will be described.

In the method for manufacturing a pilfer proof cap of the second embodiment, the pilfer proof cap 3 is subjected to a slit forming step of forming an upper bead 16, a lower bead 17, a slit 21 and a bridge 22 on a cylindrical portion 42A of the cap material 4A. To manufacture. Further, in the second embodiment, as shown in FIG. 14, a pilfer proof cap manufacturing apparatus 102 having a movable inner tool 6 and a fixed outer tool 7B (hereinafter referred to as a manufacturing apparatus 102). ) Is used.

(Overall configuration of pilfer proof cap manufacturing equipment)
The manufacturing apparatus 102 includes an inner tool 6 on the movable side and an outer tool 7B on the fixed side, similarly to the manufacturing apparatus 101 of the first embodiment. Hereinafter, in the description of the second embodiment, the same reference numerals as those of the first embodiment will be used for the same parts as the configuration of the first embodiment, and some description will be omitted.

As shown in FIG. 14, the manufacturing apparatus 102 sandwiches the cylindrical portion 42A of the cap material 4A between the inner tool 6 and the outer tool 7B, and holds the cap material 4A and the inner tool 6 on the starting end side of the outer tool 7B. The upper bead 16, the lower bead 17, the slit 21, and the bridge 22 were formed by rolling the cap material 4A one or more turns from the to the terminal side and processing the cylindrical portion 42A in order in the circumferential direction as the cap material 4A rotated. The skirt portion 42 is molded. Further, in the manufacturing apparatus 102, by laminating a part of the cylindrical portion 42A in the circumferential direction, the machining is performed without leaving a gap on the entire circumference of the cylindrical portion 42A.

Note that FIG. 14 schematically shows a series of states during molding of the cap material 4A, and a plurality of inner tools 6 and the cap material 4A are shown on the drawing. Further, FIG. 15 is a cross-sectional view taken along the line GG in FIG. 14, showing the state of the cap material 4A at the time of molding together with the inner tool 6 and the outer tool 7B of the manufacturing apparatus 102. FIG. 16 is a developed view of the outer peripheral surface 70B of the outer tool 7B.

As the inner tool 6 on the movable side, the one having the same configuration as that of the first embodiment is used.
Further, as shown in FIG. 14, the outer tool 7B on the fixed side has an outer peripheral surface 70B formed by an arc having a radius of curvature larger than the outer peripheral surface 60 of the inner tool 6, and is an outer peripheral surface of the outer tool 7B. The 70B is formed with a circumferential length that allows the inner tool 6 to roll one or more turns. Further, the outer tool 7B has a configuration in which a plurality of plates are laminated, and as shown in FIG. 15, includes at least an outer lower bead plate 71B, a slit plate 72B, and an outer upper bead plate 73B. Of these, the outer peripheral surfaces of the outer lower bead plate 71B and the outer upper bead plate 73B are formed to have the same shape as the outer lower bead plate 71A and the outer upper bead plate 73A of the outer tool 7A of the first embodiment in a vertical cross-sectional view. ing.

As shown in FIG. 15, the slit plate 72B is arranged so as to face both the inner lower bead plate 61 and the inner upper bead plate 62. Further, as shown in FIGS. 14 and 16, a plurality of second cutting edge portions 725a to 725c for cutting the cylindrical portion 42A with the first cutting edge portion 623 are provided on the outer peripheral surface of the slit plate 72B, respectively. The protruding pieces 722a to 722c, the lower bead accommodating portion 742B arranged to face the lower bead forming convex portion 612, and the upper bead accommodating portion 743B arranged to face the upper bead forming convex portion 624 are formed. ing.

As shown in the developed view of the outer peripheral surface 70B of the outer tool 7B of FIG. 16, in the manufacturing apparatus 102 of the second embodiment, the second cutting edge portions 725a to 725c are formed horizontally in the circumferential direction. It is formed parallel to the first cutting edge portion 623. Further, only the terminal second cutting edge portion 725c out of the plurality of second cutting edge portions 725a to 725c provided is arranged close to the first cutting edge portion 623. As a result, the distance Hc in the axial direction O of the cylindrical portion 42A between the end portion of the second cutting edge portion 725c on the end side and the first cutting edge portion 623 is set to the start end portion and the first cutting of the second cutting edge portion 725a on the start end side. The distance between the cylindrical portion 42A and the blade portion 623 in the axial direction O is smaller than Ha. As described above, since the end-side second cutting edge portion 725c is formed in parallel with the first cutting edge portion 623, the shafts of the end-side second cutting edge portion 725c and the first cutting edge portion 623 The interval of the direction O is a constant interval Hc in the circumferential direction. Further, since all the other second cutting edge portions 725a and 725c except the second cutting edge portion 725c on the terminal side are arranged at the same height position, these second cutting edge portions 725a and 725b and the first The distance between the cutting edge portion 623 and the axial direction O is set to a constant distance Ha in the circumferential direction.

(Manufacturing method of pilfer proof cap)
The inner tool 6 is fitted inside the cap material 4A, and as shown in FIG. 14, the cap material 4A is moved toward the outer tool 7B together with the inner tool 6. The cap material 4A is brought into contact with the outer tool 7B from the start end side, and the cylindrical portion 42A of the cap material 4A is sandwiched between the inner tool 6 and the outer tool 7B. Then, the cap material 4A is rolled together with the inner tool 6 from the start end side to the end end side of the outer tool 7B.

As shown in FIG. 15, when the cylindrical portion 42A is sandwiched between the inner tool 6 and the outer tool 7B, the inner surface of the cylindrical portion 42A is pressed by the lower bead forming convex portion 612 and the upper bead forming convex portion 624 of the inner tool 6. The outer surface of the cylindrical portion 42A is pressed by the lower bead forming portion 713 of the outer tool 7B, the upper bead forming portion 733, and the convex surface portion 727 of the protruding pieces 722b (722a, 722c), and the upper bead 16 and the lower bead are pressed against the cylindrical portion 42A. 17 is formed.

Further, the second surface 724 and the convex surface 727 at the tip of the protruding piece 722b further press the cylindrical portion 42A between the upper bead 16 and the lower bead 17 from the outer side in the radial direction to the inner side. , The inner surface of the cylindrical portion 42A is pressed against the first cutting edge portion 623. Then, the cylindrical portion 42A is further pressed inward in the radial direction by the protruding piece 722b, so that the first cutting edge portion 623 and the second cutting edge portion 725b intersect in the radial direction, and the first cutting edge portion The cylindrical portion 42A is broken between the 623 and the second cutting edge portion 725b to form a slit 21.

Further, as shown in FIG. 14, by rolling the cap material 4A one or more turns from the start end side to the end side of the outer tool 7B, the first cutting edge portion 623 and the second cutting edge portions 725a to 725c are formed. Are sequentially intersected in the radial direction of the cylindrical portion 42A. As a result, the cylindrical portion 42A is intermittently cut between the first cutting edge portion 623 and each of the second cutting edge portions 725a to 725c to form a plurality of slits 21 and between the slits 21. The bridge 22 is formed.

Further, the slits 21 arranged in the overlapping portion of the skirt portion 42 among the plurality of slits 21 are partially located in the circumferential direction by the second cutting edge portion 725a on the start end side and the second cutting edge portion 725c on the end side. It is processed in layers. That is, by superimposing the end portion of the end side second cutting edge portion 725c on the start end portion 21a of the start end side slit 21 that is first machined by the start end side second cutting edge portion 725a, the start end portion 21a is formed. The end portion 21c is continuously formed, and one slit 21 is formed by connecting the start end portion 21a and the end portion 21c.

Also in the second embodiment, the end side second cutting edge portion 725c arranged on the end side of the outer tool 7B is the second rather than the start end side second cutting edge portion 725a arranged on the start end side of the outer tool 7B. 1 By arranging it close to the cutting edge portion 623, the machining position of the termination portion 21c of the slit 21 machined by the second cutting edge portion 725c on the terminal side and the first cutting edge portion 623 can be set to the cylindrical portion accompanying the machining. It is arranged according to the position corresponding to the amount of contraction of the height of the axial direction O of 42A and the amount of downward movement of the slit 21. Therefore, even if the height of the cylindrical portion 42B in the axial direction O or the position of the start end portion 21a of the first processed slit 21 changes as the machining to the cylindrical portion 42A progresses, the second cutting edge portion on the start end side The end portion 21c of the slit 21 finally machined by the second cutting edge portion 725c on the terminal side can be machined so as to be aligned with the substantially same height position of the start end portion 21a of the slit 21 first machined by the 725a. Therefore, it is possible to suppress the formation of burrs and whiskers in the slit 21 of the overlapping portion processed by the second cutting edge portion 725a on the start end side and the second cutting edge portion 725c on the end side.

The configuration of the present invention is not limited to the above embodiment.
For example, in the manufacturing apparatus 102 of the second embodiment, as shown in the developed view of the outer tool 7B of FIG. 16, only the terminal second cutting edge portion 725c of the plurality of second cutting edge portions 725a to 725c provided is provided. Was arranged close to the first cutting edge portion 623, but as shown in the developed view of the outer tool 7C of FIG. 17, only the starting end side second cutting edge portion 725a was arranged away from the first cutting edge portion 623. You may. Further, similarly to the outer tool 7A of the first embodiment, the entire outer tool is arranged so as to be inclined downward from the start end side to the end side, and the end portion and the first cutting edge of the end side second cutting edge portion 725c. The distance Hc in the axial direction O from the portion 623 may be formed to be smaller than the distance H in the axial direction O between the start end portion of the second cutting edge portion 725a on the starting end side and the first cutting edge portion 623.

Further, as shown in FIGS. 16 and 17, in addition to changing the height position in units of the second cutting edge portion, only the end portion of the end side second cutting edge portion for processing the overlap portion of the slit is formed. It may be arranged close to the first cutting edge portion, or only the starting end portion of the second cutting edge portion on the starting end side may be arranged away from the first cutting edge portion. In either case, the end portion of the second cutting edge portion on the termination side and the first cutting edge are placed on the start end portion of the slit first machined by the start end portion of the second cutting edge portion on the start end side and the first cutting edge portion. The processing position of the end portion of the slit processed by the portion can be aligned. Therefore, the second cutting edge portion on the ending side and the first cutting edge portion are aligned with the substantially same height position of the starting end portion of the slit first machined by the second cutting edge portion on the starting end side and the first cutting edge portion. Allows the end of the slit to be machined last to be machined.

Further, in the manufacturing apparatus 101 of the above embodiment, by disposing a spacer 112 having a plate thickness of 0.05 mm between the apparatus main body 111 and the outer tool 7A, the second cutting edge portion 725a on the starting end side of the outer tool 7A is provided. The position of the start end portion is arranged at a position 0.05 mm higher than the position of the end portion of the end side second cutting edge portion 725c, and the end side second cutting edge portion 725c is arranged with respect to the position of the start end side second cutting edge portion 725a. However, the amount of movement of the end portion of the second cutting edge portion 725c on the end side is not limited to this, and the manufactured pilfer proof cap 3 (cap material 4A, It is appropriately adjusted according to the processing amount of 4B).

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the bottle can with a cap and the pilfer proof cap attached to the bottle can have been described, but the container of the container with a cap according to the present invention is not limited to the bottle can. , Bottle cans, as well as containers such as glass bottles and PET bottles.

Further, in the above embodiment, the second cutting edge portions 725a to 725c are arranged on the upper side of the first cutting edge portion 623, but the second cutting edge portion can also be arranged on the lower side of the first cutting edge portion. is there.

3 Pilfer proof cap 4 Cap body 4A, 4B Cap material 5 Liner 6 Inner tool 7A, 7B, 7C Outer tool 11 Nar recess 12 Opening 13 Hook part 14a Upper groove part 14b Lower groove part 15 Female thread formation planned part 16 Upper bead 17 Lower bead 18 Hem 19 Bend 21 Slit 21a Start end 21b End 22 Bridge 41 Top 42 Skirt 42A, 42B Cylindrical 43 Cylinder upper 44 Cylinder lower 48 Upper 49 Lower 51 Sliding layer 52 Sealing layer 61 Under inner Bead plate 62 Inner upper bead plate 63 Inner intermediate plate 71A, 71B, 71C Outer lower bead plate 72A, 72B, 72C Slit plate 73A, 73B, 73C Outer upper bead plate 81 1st area 82 2nd area 101,102 Pilfer proof Cap manufacturing equipment (manufacturing equipment)
111 Device body 112 Spacer 611 Inner side hem forming part 612 Lower bead forming convex part 617 Slit relief groove part 623 First cutting edge part 624 Upper bead forming convex part 711 Outer side hem forming part 713 Lower bead forming part 722a, 722b, 722c Piece 725a 2nd cutting edge on the starting end side (2nd cutting edge)
725b 2nd cutting edge part 725c Terminal side 2nd cutting edge part (2nd cutting edge part)
733 Upper bead forming part 741 Bridge accommodating part 742A First lower bead accommodating part 742B Second lower bead accommodating part (lower bead accommodating part)
743A 1st upper bead housing 743B 2nd upper bead housing (upper bead housing)
811 Bent part molding convex part

Claims (4)

A plurality of slits and a plurality of bridges alternately arranged in the circumferential direction of the skirt portion are formed on the skirt portion of the cap body having a top surface portion and a skirt portion substantially hanging from the peripheral edge of the top surface portion. A device for manufacturing pilfer proof caps
An inner tool that has a first cutting edge portion formed along the circumferential direction and is fitted inside a cap material having a cylindrical portion that serves as the top surface portion and the skirt portion.
It has a plurality of second cutting edge portions arranged at intervals from the first cutting edge portion in the axial direction of the cylindrical portion, sandwiches the cylindrical portion with the inner tool, and holds the cylindrical portion. An outer tool for forming the slit between the first cutting edge portion and the second cutting edge portion to form the skirt portion while processing the skirt portion.
By rolling the cap material together with the inner tool from the start end side to the end side of the outer tool by one or more turns, the first cutting edge portion and the plurality of the second cutting edge portions are brought into the radial direction of the cylindrical portion. The cylindrical portion is intermittently cut between the first cutting edge portion and the plurality of second cutting edge portions to form the plurality of slits, and the plurality of the second cutting edge portions are formed. By the start end portion of the start end side second cutting edge portion disposed on the start end side of the outer tool and the end portion of the end side second cutting edge portion arranged on the end side of the outer tool. It is configured to overlap a part of the slit in the circumferential direction and process it.
The axial distance between the end portion of the second cutting edge portion on the end side and the first cutting edge portion is the axial direction between the start end portion of the second cutting edge portion on the start end side and the first cutting edge portion. A device for manufacturing pilfer proof caps, which is characterized by being formed smaller than the distance between the blades. The pill according to claim 1, wherein the axial distance between the first cutting edge portion and the second cutting edge portion is gradually reduced from the start end side to the end side of the outer tool. Fur proof cap manufacturing equipment. A plurality of slits and a plurality of bridges alternately arranged in the circumferential direction of the skirt portion are formed on the skirt portion of the cap body having a top surface portion and a skirt portion substantially hanging from the peripheral edge of the top surface portion. How to make a pilfer proof cap
An inner tool that has a first cutting edge portion and is fitted inside a cap material having a cylindrical portion that serves as the top surface portion and the skirt portion.
It has a plurality of second cutting edge portions arranged at intervals from the first cutting edge portion in the axial direction of the cylindrical portion, sandwiches the cylindrical portion with the inner tool, and holds the cylindrical portion. With an outer tool that forms the slit between the first cutting edge portion and the second cutting edge portion and forms the skirt portion while processing.
By rolling the cap material together with the inner tool from the start end side to the end side of the outer tool by one or more turns, the first cutting edge portion and the plurality of second cutting edge portions are brought into the radial direction of the cylindrical portion. The cylindrical portion is cut between the first cutting edge portion and the plurality of second cutting edge portions to form the plurality of slits, and among the plurality of the second cutting edge portions. One of the slits by the start end portion of the start end side second cutting edge portion arranged on the start end side of the outer tool and the end portion of the end side second cutting edge portion arranged on the end side of the outer tool. It has a slit forming process in which parts are overlapped in the circumferential direction and processed.
In the slit forming step, the axial distance between the end portion of the second cutting edge portion on the end side and the first cutting edge portion is set between the start end portion of the second cutting edge portion on the start end side and the first cutting edge. A method for manufacturing a pilfer proof cap, which is characterized in that it is formed to be smaller than the axial distance from the portion. The pill according to claim 3, wherein the axial distance between the first cutting edge portion and the second cutting edge portion is gradually reduced from the start end side to the end side of the outer tool. How to make a fur proof cap.

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