JPH1059394A - Device to form annular double-wall on synthetic resin product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately form an annular cut face at a high speed. SOLUTION: An annular body 110 is cut off while leaving a bridging part 118 after a synthetic resin cap 100 has been integrally formed, by this device. A rotary turret 10 provided with a notch receiving the cap is fixed on a rotary anvil 12 and a positioning member 40 of the cap 100 is arranged in the rotary anvil 12. The cap 100 is positioned in a position for the cutting process or a position for non-cutting by a first lifting means in the positioning member 40. A cutter holder 66 rotataing together with the rotary anvil 12, provided with a stopper 80 and a circular cuter 70 is arranged at the upper part of respective notches. The cutter holder 66 is positioned at an actuation position where the stopper 80 presses the cap 100 and the cutter 70 cuts the annular body 110 by the second lifting means, and a non-actuation position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin product such as a synthetic resin cap applied to a container containing contents such as liquid or a synthetic resin cover member applied to a spouting container. The present invention relates to an apparatus for forming a heavy wall.

[0002]

2. Description of the Related Art An opening of a container containing contents such as a liquid is sealed with a cap made of, for example, a synthetic resin to prevent the contents from leaking. Sealing with a cap must be performed with sufficient reliability. In addition, the cap is required to have TE (tamper evidence) characteristics. Further, when the container is discarded as waste after the contents are consumed, it is desired to separate and discard the material as much as possible from the viewpoint of resource reuse and the like. That is, the synthetic resin cap has a TE characteristic and is locked while maintaining a sufficiently secure sealing state with respect to the container. It is required that they can be separated easily enough without using any.

A cap made of a synthetic resin for satisfying the above requirements is disclosed in, for example, Japanese Patent Application No. 7-120108 and Japanese Patent Application No.
No. -30929 and Japanese Patent Application No. 8-66536 have already been filed by the present applicant. Each of the synthetic resin caps disclosed in the specifications in these applications has an annular body having an annular inner wall and an annular outer wall surrounding the periphery of the annular inner wall. The inner wall of the inner wall is provided with locking means for locking the locked means provided on the outer peripheral portion on the container side, and the inner wall has a plurality of slits extending upward from the lower end thereof. They are formed at intervals in the circumferential direction. The inner wall and the outer wall are configured to be interconnected via a plurality of breakable bridging portions arranged at circumferentially spaced intervals. The plurality of bridging portions may be arranged on the opening end side of the cap, or may be arranged on the opposite side in the axial direction to the opening end side of the cap, that is, on the top wall side.

On the other hand, when the synthetic resin cover member applied to the ejection container is discarded as a waste product despite being sufficiently securely locked to the container, a special device such as a knife is used. It is required to be easily separable without performing the above. For example, Japanese Patent Application No. 8-118563 and Japanese Patent Application No. 8-118563 disclose cover members for satisfying this requirement.
No. 186148 has already been filed by the present applicant. This cover member also has a double wall structure substantially similar to the cap.

[0005]

In order to form an inner wall and an outer wall, that is, a double wall, in a synthetic resin product such as a cap or a cover member having the above-described form,
After integrally molding the product by injection molding or compression molding, it is necessary to form an annular cut surface by annularly cutting the annular body at the radially intermediate portion, leaving each of the bridging portions. The formation of such an annular cut surface must be performed at high speed and accurately, and there has been a demand for the development of a new device for that purpose. It is also desired that this device be relatively inexpensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a main object of the present invention is to form an annular cut surface at high speed and accurately, and therefore to achieve high efficiency and high productivity.
An object of the present invention is to provide an apparatus for forming an annular double wall in a novel synthetic resin product.

Another object of the present invention is to provide an apparatus for forming an annular double wall in a novel synthetic resin product, which can form an annular cut surface at a relatively low cost.

[0008]

According to the present invention, there is provided, in accordance with the present invention, an annular body having an annular inner wall and an annular outer wall surrounding the periphery of the annular inner wall. On the peripheral surface, locking means for locking with a locked means provided on the outer peripheral portion on the container side is formed, and the inner side wall and the outer side wall are arranged at least in the circumferential direction with a space therebetween. Forming the inner and outer walls of a synthetic resin product interconnected via a plurality of rupturable bridges, forming at least each of the bridges after integrally molding the product. An apparatus for forming an annular double wall in a synthetic resin product for cutting the annular body into an annular shape at a radially intermediate portion while leaving a rotary anvil, and a product fixed on the rotary anvil and the product A plurality of notches that accept and transport a part of the outer circumference of the A rotary turret plate, and a positioning member for the product disposed on the rotary anvil corresponding to each of the notches; and cutting the product by raising the positioning member to engage the product. A first raising / lowering means for positioning an operating position positioned at a processing position, and a non-operating position for lowering the positioning member from the operating position to release the engagement; and rotating integrally with the rotary anvil. Cutter holding means disposed above and corresponding to each of the notches and provided with a stripper and an annular cutter, and by lowering the cutter holding means, the stripper presses the product; An operating position where the cutter cuts the intermediate portion of the annular body in an annular shape, and a non-operating position where the cutter and the stripper are lifted away from the product by raising the cutter holding means from the operating position. And a second elevation motion means because, apparatus for forming an annular double wall plastic product characterized in that, is provided.

In the above invention, the positioning member of the synthetic resin product is positioned at the operating position by the first lifting / lowering means, whereby the product is positioned at the cutting position, and the cutter is held by the second lifting / lowering means. By positioning the means in the operative position, the stripper is pressed against the product and the cutter cuts the middle portion of the toroidal ring. It is easy to operate the first elevating means and the second elevating means at appropriate timing. Thus, while the product is received and transported in the notches of the rotating turret plate, the product is successively subjected to annular cutting, and the annular cutting surface defining the boundary surface of the annular double wall is fast and accurate. Formed. Therefore, according to the present invention, an apparatus for forming an annular double wall in a novel synthetic resin product with high efficiency and high productivity can be obtained.

According to the present invention, in addition to the above configuration,
The cutter is formed by processing a blade on one side of the rectangular flat plate member having a predetermined width and length over the entire length in the width direction, and then forming the flat plate member into an annular shape. An apparatus for forming an annular double wall in a synthetic resin product.

In the present invention, since the cutter is formed by processing the blade on the flat plate member and then forming the same into an annular shape, the cutter is formed by processing the blade on the endless annular plate member. In comparison, the manufacturing cost can be significantly reduced. In the latter cutter, it is considerably difficult to chuck the blade when machining the blade, and the manufacturing cost is considerably high in order to secure a predetermined accuracy. Since a plurality of (for example, nine) cutters are used per apparatus and are consumables, the cost reduction effect of the present invention becomes proportionally greater as the number of processed workpieces increases. Therefore, according to the present invention, an apparatus for forming an annular double wall on a novel synthetic resin product, which can form an annular cut surface at a relatively low cost, is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an apparatus for forming an annular double wall in a synthetic resin product constituted according to the present invention will be described below in more detail with reference to the accompanying drawings. First,
An embodiment of a synthetic resin cap which is a synthetic resin product having an annular double wall formed by the apparatus according to the present invention will be described with reference to FIGS.

A synthetic resin cap generally designated by the reference numeral 100 includes a top wall 102 and a skirt wall 104 hanging down from the periphery of the top wall 102. Skirt wall 10
4 has an annular inner wall 106 and an annular inner wall 10
6 having an annular outer wall 108 surrounding the periphery of the annular body 6
0. The lower end of the outer wall 108 is located at a position extending further below the lower end of the inner wall 106. The container 1 shown by a two-dot chain line in FIG.
An annular projection 116 (locking means) is formed to be locked by an annular recess 114 (locked means) provided on the outer periphery of the 12 mouths. A plurality of slits 117 extending upward from the lower end of the inner wall 106 are formed at intervals in the circumferential direction.

At the lower end of the boundary region between the inner wall 106 and the outer wall 108, a plurality of circumferentially extending arc-shaped grooves 115 are formed. The inner side wall 106 and the outer side wall 108 are interconnected via a plurality of breakable bridging portions 118 arranged at circumferentially spaced intervals. The inner wall 106 and the outer wall 108 are separated by an annular cut surface 120 except for each of the bridging portions 118. Thus, the annular body 110 forms a double wall. Each of the bridging portions 118
The arc-shaped groove 115 is formed between a substantially lower end portion of the outer peripheral surface of the inner wall 106 and a corresponding inner peripheral surface of the outer wall 108. On the outer side wall 108, a tab 122 for opening protruding radially outward is formed over a part in the circumferential direction.

When the cap 100 constructed as described above is locked (attached) to the mouth of the container 112 as shown in FIG. 11, the inner wall 106 has a cut surface 120 at the periphery of the outer wall. 108, so that despite the presence of the slit 117, the inner wall 10
6 is sufficiently reliably prevented from spreading radially outward. Therefore, the convex portion 116 formed on the inner peripheral surface of the inner wall 106 is sufficiently firmly engaged with the concave portion 114 formed at the mouth of the container 112.

In order to detach the cap 100 from the mouth of the container 112, a finger is put on the tab 122 to forcibly move it upward. As a result, the outer wall 108 is forced upward, so that considerable stress is generated in each of the bridging portions 118,
Is broken. Since the inner wall 106 is locked to the container 112, only the outer wall 108 is separated from the cap 100. Next, the inner wall 106 can be easily separated from the container 112 by forcing upward with a finger (due to the presence of the slit 117 formed in the inner wall 106).

Next, the synthetic resin cap 1 as described above
An embodiment of a novel apparatus for forming an annular cut surface 120 on the annular body 110 of FIG. The cut surface 120 is formed in a cutting process after injection molding or compression molding of the cap 100.

Referring to FIG. 1, reference numeral 2 designates an apparatus for forming an annular double wall in a cap 100, which is constructed in accordance with the present invention, and is arranged downstream of a conveying apparatus 4. 6
Is a transport chute for continuously supplying the cap 100, and is arranged on the upstream side of the transport device 4. The cap 100 on which the cut surface 120 is not formed is moved by the transport chute 6 so that its opening is downward and the tab 12
2 are sequentially conveyed in a state where they are directed to the upstream side. The cap 100 discharged from the discharge end of the transport chute 6 is transferred to the rotating turret plate 8 of the transport device 4. The cap 100 transferred to the rotary turret plate 8 is conveyed in a state in which the tab 122 faces outward in the radial direction according to the clockwise rotation of the rotary turret plate 8, and in the transfer region R, the rotary turret of the device 2 of the present invention is transferred. It is delivered to the board 10. The rotating turret plate 10 is fixed on the rotating anvil 12,
It is rotated integrally with the rotating anvil 12. The cap 100 transferred to the rotary turret plate 10 on the upper surface of the rotary anvil 12 is transferred with the tab 122 directed inward in the radial direction according to the counterclockwise rotation of the rotary turret plate 10 and discharged in the discharge area E. It is discharged toward the chute 13. While the cap 100 is rotationally transferred from the delivery area R to the discharge area E in the apparatus 2, a cut surface 120 is formed in the annular body 110 of the cap 100 as described later in detail.

The transport chute 6, the transport device 4, and the transport mechanism of the cap 100 in the device 2 of the present invention may be a well-known transport mechanism, and a detailed description thereof will be omitted. FIG.
In the figure, reference numeral 14 denotes an arc-shaped stationary substrate disposed on the transfer device 4, and the cap 100 is transferred on its upper surface. Reference numeral 16 denotes a stationary guide arranged so as to extend in an arc shape along a radially outer side of the rotary turret plate 8, and its downstream end extends to the delivery area R of the device 2. Reference numeral 18 denotes a stationary guide arranged so as to extend in a circular arc shape along the radially outer side of the rotating turret plate 10 of the apparatus 2, and extends from the delivery area R to the discharge area E. Stationary guide 1
8 is positioned so as to be continuous with one guide 13a of the discharge chute 13 in the discharge area E. The other guide 13 b of the discharge chute 13 extends to the discharge area E of the device 2.

Next, the device 2 according to the present invention will be described in more detail. Referring mainly to FIG. 2, a support 22 having a cylindrical portion is fixed to a stationary substrate 20 fixed on a floor (not shown). A shaft 24 is fixed upright in the cylindrical portion of the support 22. Therefore axis 2
4 is a fixed axis. 26 is a cylindrical driven shaft,
It is arranged so as to cover the outer peripheral surface of the fixed shaft 24 with a gap. A lower end of the driven shaft 26 is rotatably supported by the support 22 via a bearing 28, and an annular holder 30 is connected to an upper end of the driven shaft 26 via a key so as to be able to rotate integrally therewith. Reference numeral 30 denotes a fixed shaft 24 via a bearing 32.
It is supported rotatably. A driven gear 34 is connected to the vicinity of the lower end of the driven shaft 26 via a key so as to be integrally rotatable. The driven gear 34 is drivingly connected to a driving motor as a driving source via another gear (neither is shown).

The annular rotating anvil 12 is connected to a substantially central portion of the driven shaft 26 in the vertical axis direction so as to be integrally rotatable. The rotating turret plate 10 is fixed on the rotating anvil 12. Nine arc-shaped notches 36 for receiving and transporting a part of the outer periphery of the cap 100 are formed in the peripheral edge of the rotary turret plate 10. In addition, as shown in FIG.
A similar notch 38 is also provided on the periphery of the rotary turret plate 10.
Are formed. Each of the notches 38 of the transport device 4 and each of the notches 38 of the device 2 are defined in a mutual positional relationship so as to be aligned with each other in the delivery area R.

Referring to FIG. 2 and FIG.
2, a positioning member 40 is provided corresponding to each of the notches 36 of the rotary turret plate 10. Each of the positioning members 40 has a plunger shape, and is inserted movably in the vertical axis direction into a large-diameter hole 42 formed in the rotary anvil 12 correspondingly. A small-diameter hole 44 is formed below each of the large-diameter holes 42 of the rotary anvil 12, and a spindle 46 is inserted into each of the small-diameter holes 44 so as to be movable in the vertical axis direction and cannot rotate. The lower end of each of the positioning members 40 and the upper end of the corresponding spindle 46 are detachably connected. A yoke 47 is formed at the lower end of each of the spindles 46, and a roller follower (cam follower) 48 is rotatably mounted on each of the yokes 47. A coil spring 49 is interposed between each of the yokes 47 and the lower surface of the rotating anvil 12, so that each of the roller followers 48 has an annular cam member 50 disposed below them as described later. Is pressed by the cam surface 52. Accordingly, the vertical movement of each of the spindles 46 (ie, each of the positioning members 40) is controlled by the cam surface 52. The downward movement of each of the positioning members 40 is regulated by an annular step formed between each of the large-diameter holes 42 and the corresponding small-diameter hole 44.

Referring to FIGS. 1-3, as will be readily understood from the following description, during the rotation of one notch 36 of the rotary turret plate 10 from the delivery area R to the discharge area E. When the roller follower 48 corresponding to the notch 36 is rotated along the cam surface 52 of the cam member 50, the corresponding positioning member 40 has a predetermined height against the urging force of the coil spring 49. The operation position is raised at a predetermined timing and the non-operation position is lowered from the operation position. The positioning member 40 is engaged (fitted) with the inner peripheral surface of the outer wall 108 of the cap 100 received in the notch 36 in the above-described operation position, so that the cap 100 is accurately positioned at the cutting position. Be positioned. In addition, the positioning member 40 is disengaged from the inside of the inner wall 108 of the cap 100 in the above-mentioned non-operating position by disengaging downward. When the positioning member 40 is in the inoperative position, its upper surface is aligned with the upper surface of the rotating anvil 12. The cam member 50, the cam surface 52, the roller follower 48, the spindle 4
The 6 and the coil spring 49 constitute a first elevating means for positioning the positioning member 40 at the predetermined position at the operation position and the non-operation position.

On the stationary substrate 20, an annular support member 5 is provided.
The lower end of the support member 4 is fixed, and an annular support plate 56 is fixed to the upper end of the support member 54. The cam member 50 is fixed to the support plate 56 on the radially inner side. An annular support plate 58 is fixed to the support plate 56 on the outer side in the radial direction. An arc-shaped support member 59 is fixed on the support plate 58, and the stationary guide 18 is fixed on the support member 59. The stationary guide 18 is spaced from the upper surface of the rotating anvil 12.

At a position corresponding to each of the notches 36 on the periphery of the holder 30 integrally rotatably connected to the driven shaft 26, the spindle 60 is movable in the vertical axis direction via a bush 62. It is attached to. An adapter 64 is detachably attached to the lower end of each of the spindles 60, and each of the adapters 64 is provided with a cutter holding means 66.
Is detachably mounted. Each of the cutter holding means 66 includes a cutter holder 68 detachably attached to the corresponding adapter 64 and a pair of clamp members 72 and 74 described later for detachably attaching the annular cutter 70 to the lower end of the cutter holder 68. (See FIGS. 6 and 7).

Each of the cutter holders 68 forms an annular body having a large-diameter portion and a small-diameter portion as a whole, and a through hole 76 is formed in the axial center portion.
Is formed, and an outer peripheral surface (circumferential surface) 78 for supporting the cutter is formed in the small diameter portion at the lower end. The through-hole 76 includes a large-diameter hole formed to extend upward and a small-diameter hole formed to extend downward, and a step is formed between the two holes. A retainer 79 is mounted above the large diameter hole, and a stripper 80 is fitted into the small diameter hole so as to be movable in the vertical axis direction. An annular flange extending radially outward is formed at the upper end of the stripper 80, and a lower end closing hole that opens at the upper end is formed.
The annular flange of the stripper 80 is fitted into the large-diameter hole movably in the axial direction. A coil spring 82 is interposed between the retainer 79 and the lower end closing hole of the stripper 80, and the stripper 80 is urged downward. As a result, the annular flange of the stripper 80 is pressed against the stepped portion of the through hole 76, and the lower end surface of the stripper 80 is
Is held so as to protrude downward from the lower end of the.

Referring to FIG. 8 and FIG.
0 is a rectangular flat plate member 70 having a predetermined width and length.
a (see FIG. 9). That is, a blade (sharp edge) 70b is formed by polishing on one side in the width direction of the flat plate member 70a over the entire length in the longitudinal direction. Next, the flat plate member 70a is formed into an annular shape to form an annular cutter 70 (see FIG. 8). The cutter 70 formed as described above is detachably mounted on the outer peripheral surface 78 of the corresponding cutter holder 68 by a pair of clamp members 72 and 74 described below.

Referring to FIG. 6 and FIG.
Reference numerals 2 and 74 each have a shape obtained by cutting the annular body along the axis and dividing it into two parts, and have the same semicircular shape when viewed from the axial direction. The clamp member 72 includes a large-diameter outer peripheral surface 72a, a small-diameter outer peripheral surface 72b, and a small-diameter inner peripheral surface 72b.
c, large-diameter inner peripheral surface 72d, two end surfaces 72e and 72f
It has. Outer peripheral surfaces 72a and 72b, inner peripheral surface 72c
And 72d each form a semicircular surface. Small diameter inner peripheral surface 7
A step 73 is formed between 2c and the large-diameter inner peripheral surface 72d, and the difference between the radii of the two (radial length of the step 73) is defined to be substantially equal to the plate thickness of the cutter 70. I have. End face 7
2e and 72f are on one plane passing through the axis and parallel to the axis. The clamp member 72 has an axis perpendicular to the end face 72e and has one end open to the end face 72e, the other end having a screw hole 72g opening to the outer peripheral face 72a, and an axis perpendicular to the end face 72f, and one end thereof. A screw hole 72h opening to the end face 72f and the other end opening to the outer peripheral face 72a is formed.

The clamp member 74 has a large-diameter outer peripheral surface 74.
a, a small-diameter outer peripheral surface 74b, a small-diameter inner peripheral surface 74c, a large-diameter inner peripheral surface 74d, and two end surfaces 74e and 74f. Outer peripheral surfaces 74a and 74b, inner peripheral surfaces 74c and 74d
Each form a semicircular surface. A step 75 is formed between the small-diameter inner peripheral surface 74c and the large-diameter inner peripheral surface 74d, and the difference between the radii of the two (radial length of the step 75) is determined by the cutter 7.
It is defined substantially equal to a plate thickness of zero. End faces 74e and 7
4f exists on one surface that passes through the axis and is parallel to the axis.
The clamp member 74 has an axis perpendicular to the end surface 74e, and has one end opened to the end surface 74e and the other end connected to the outer peripheral surface 74a.
A mounting hole 74g opening in the counterbore 77a formed in
It has an axis perpendicular to the end face 74f and has one end at the end face 74f.
Counterbore 77 having the other end formed on the outer peripheral surface 74a.
74b is formed with a mounting hole 74h that opens to b.

When the clamp members 72 and 74 abut the opposing end surfaces 72e and 74e and the end surfaces 72f and 74f, respectively, the outer peripheral surface and the inner peripheral surface thereof form a circular surface, respectively. The screw holes 72 facing each other are also provided.
g and the mounting hole 74g, and the screw hole 72h and the mounting hole 74h are configured to be positioned on a common axis.

Referring to FIGS. 3, 6 to 8, the annular cutter 70 has its inner peripheral surface fitted to the outer peripheral surface 78 of the cutter holder 68 of the corresponding cutter holding means 66, and its outer peripheral surface is clamped. Large diameter inner peripheral surface 72 of members 72 and 74
d and 74d. The clamp members 72 and 74 are connected to the end faces 72e and 74e,
4f are opposed to each other and detachably fastened by bolts (not shown). As described above, the cutter 70 is firmly detachably mounted on the outer peripheral surface 78 of the cutter holder 68 (see FIG. 3). As is clear from the above description, the mounting of the cutter 70 can be performed easily and quickly. In the mounted state of the cutter 70 shown in FIG.
The lower end of the cutter 70 is positioned above the lower end of the stripper 80.

Referring again to FIG. 2, the spindle 60
A roller follower (cam follower) 84 is rotatably mounted on the upper end of each of them. On the other hand, an annular cam member 86 is fixed to the upper end of the fixed shaft 24. A channel-shaped cam groove 88 is formed on the entire outer peripheral surface of the cam member 86. Cam groove 8
Inside the roller 8, each of the roller followers 84 is movably fitted and supported. Therefore, the vertical movement of each of the spindles 60 (that is, each of the cutter holding means 66) is controlled by the cam groove 88.

As will be readily understood from the following description, as described above, one notch 36 in the rotating turret plate 10
Is rotated from the delivery area R to the discharge area E, the roller follower 84 corresponding to the notch 36 is rotated along the cam groove 88 of the cam member 86, so that the corresponding cutter holding means 66 is rotated. Are positioned at a predetermined timing between a lowered operation position and a non-operation position raised from the operation position. Cutter holding means 6
6 is positioned in the working position, the stripper 8
The lower surface of the cap 0 presses the top wall 102 of the cap 100 via the coil spring 82, and the cutter 70 cuts the intermediate portion of the annular body 110 of the cap 100 into an annular shape while leaving the bridging portion 118. When the cutter holding means 66 is located at the non-operation position, the cutter 70 and the stripper 80 are separated upward from the cap 100. The cam member 86, the cam groove 88, the roller follower 84, the spindle 60 and the like constitute a second elevating / lowering means for positioning the cutter holding means 66 at the above-mentioned working position and the non-working position at a predetermined timing.

Next, the operation of the device 2 of the present invention will be described. Referring mainly to FIGS. 1 and 2, when a driving force from a drive motor (not shown) is transmitted to a driven gear 34 via a gear (not shown), the rotary anvil 12 and the rotary turret plate 10 are driven via a driven shaft 26. , Cutter holding means 66
Are integrally driven to rotate. The rotating turret plate 8 of the transport device 4 is also rotated at the same peripheral speed in synchronization with the rotating turret plate 10. In the delivery area R, the cap 100 transferred from one notch 38 of the rotary turret plate 8 of the transport device 4 to one notch 36 of the rotary turret plate 10 of the device 2 is placed on the rotary anvil 12. In this state, it is transferred counterclockwise in FIG. Cap 100
While (the axis of) is transferred from the delivery area R to the position P1,
The cutter holding means 66 and the positioning member 40 are both held at the non-operating position (the state shown in FIG. 3) (the fact that the shapes of the cam surface 52 and the cam groove 88 are defined as described below) In the description, a supplementary explanation to that effect is omitted.)

While the cap 100 is transferred from the position P1 to the position P3, the cutter holding means 66 is lowered by a part of the total strokes and is positioned at the cap holding position. The lower surface of the stripper 80 is brought into contact with the upper surface of the top wall 102 of the cap 100. At this time, the cutter 70 is located at a position above the cap 100.

While the cap 100 is being transferred from the position P2 to the position P3, the positioning member 40 is raised by a predetermined full stroke and held at the above-mentioned working position. The positioning member 40 projects from the upper surface of the rotating anvil 12 by a predetermined height, and is engaged with the inner peripheral surface of the outer wall 108 of the cap 100. The cap 100 is sandwiched from above and below by the stripper 80 and the positioning member 40, and the axis of the cap 100 is aligned with the axis of the cutter holding means 66, that is, the axis of the cutter 70 by the positioning member 40. Accurately positioned.
The above state is shown in FIG.

While the cap 100 is transferred from the position P3 to the position P6, the elevation of the positioning member 40 is stopped, and the state of the position P3 (the state shown in FIG. 4) is maintained.
On the other hand, while the cap 100 is transferred from the position P3 to the position P4, the raising and lowering movement of the cutter holding means 66 is also stopped, and the state of the position P3 (the state shown in FIG. 4) is maintained. The cutter holding means 6
6, the remaining stroke of the total stroke is lowered and positioned in the operating position. This lowering causes the stripper 80, which is in contact with the upper surface of the top wall 102 of the cap 100, to rise relatively against the urging force of the coil spring 82, and the spring force causes the cap 100 to be more strongly rotated. Pressed on the top of. At the same time, the cutter 70 cuts the intermediate portion of the annular body 108 of the cap 100 into an annular shape while leaving the bridging portion 118. This state is shown in FIG. Cap 100 is at position P
During the transfer from the position 5 to the position P6, the cutter holding means 66
Is stopped and maintained at the above-mentioned operation position.

While the cap 100 is transferred from the position P6 to the position P7, the positioning member 40 is lowered by a full stroke and is positioned at the non-operating position (the position shown in FIG. 3). Thereafter, the positioning member 40 is maintained at the non-operating position until the position P2 is reached.

When the cap 100 is moved from the position P6 to the position P8.
During the transfer to the (discharge area E), the cutter holding means 66 is raised by the entire stroke and is positioned at the non-operation position (the position shown in FIG. 3). In addition, at the time of this rising action, first,
When the cutter 70 moves upward from the annular body 110 of the cap 100, the stripper 80 is still held in a state where the cap 100 is pressed. Then, the cutter holding means 66 is further raised, and the stripper 80 is moved.
Is separated upward from the cap 100. Thereafter, the cutter holding means 66 is maintained at the non-operation position until reaching the position P1. The above operation is automatically performed sequentially for all of the caps 100 received in the notches 36 of the rotary turret plate 10.

The preferred embodiment of the apparatus for forming an annular double wall on a synthetic resin product constituted according to the present invention has been described with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Rather, various changes and modifications can be made without departing from the scope of the invention. For example,
As the synthetic resin product in which the formation of the annular double wall, that is, the formation of the annular cut surface is performed by the device 2, the cap 100 in the form shown in FIGS. 10 and 11 is exemplified. An annular cut surface can be similarly formed on the synthetic resin product of the embodiment. In another form of the synthetic resin product to which the apparatus of the present invention can be applied, unlike the illustrated cap 100, the bridging portion is arranged above the annular body (on the top wall side), and the annular cut surface is from the opening end side to the top. One formed toward the face wall side can be cited. A synthetic resin product of this form is disclosed in, for example, the specification of Japanese Patent Application No. 8-30929.

Still another example of a synthetic resin product to which the apparatus of the present invention can be applied is one in which an unbreakable connection portion is formed on the illustrated cap 100 on the side opposite to the tab 122 in the radial direction. Can be. The connecting portion is formed to have a longer axial length than the other annular portion (specifically, the connecting portion does not have the arc-shaped groove 115 in the cap 100). Although the cut surface is formed, a part in the axial direction is connected without being cut. Therefore, even if another annular portion is broken at the bridging portion, the connecting portion is not broken and the connected state is maintained. A synthetic resin product of this form is disclosed in, for example, the specification of Japanese Patent Application No. 8-30929. In addition, the said unbreakable connection part is also formed by using the annular cutter which a part of the circumferential direction was notched. The cut surface cut by such a cutter does not form a complete ring, and no cut surface is formed at a portion (connecting portion) corresponding to the cutout portion of the cutter. In this case, "annular cutter",
"Circular cutting", "Circular cutting surface", "Circular double wall", "Circular inner wall", "Circular" in "Circular outer wall" and the like is not completely continuous over the entire circumference,
Discontinuous at the connection. Therefore, the term “annular” in the present specification includes both those that are completely continuous over the entire circumference and those that are partially discontinuous.

[0042]

According to the present invention, a circular double wall can be formed on a novel synthetic resin product by which an annular cut surface can be formed at high speed and accurately on a synthetic resin product. An apparatus for forming is obtained. According to the present invention,
An apparatus for forming an annular double wall in a novel synthetic resin product, which can form an annular cut surface at relatively low cost, is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a part of a system for transporting a synthetic resin cap including the apparatus of the present invention.

FIG. 2 is a cross-sectional view illustrating a preferred embodiment of an apparatus constructed in accordance with the present invention.

FIG. 3 is a sectional view of a main part showing one operation mode of the device shown in FIG. 2;

FIG. 4 is a sectional view of a main part showing another operation mode of the device shown in FIG. 2;

FIG. 5 is a sectional view of a main part showing still another operation mode of the device shown in FIG. 2;

FIG. 6 is an exploded plan view of a clamp member provided in the device shown in FIG. 2;

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

8 is a perspective view of a cutter mounted on the device shown in FIG.

FIG. 9 is a perspective view showing a state before molding of the cutter shown in FIG. 8;

10 is a view of a synthetic resin cap having an annular double wall formed by the apparatus shown in FIG. 2 as viewed from the opening side.

FIG. 11 is a sectional view taken along the line BB of FIG. 10;

[Explanation of symbols]

 2 device of the present invention 10 rotating turret plate 12 rotating anvil 26 driven shaft 36 notch 40 positioning member 50 cam member 52 cam surface 66 cutter holding means 70 cutter 80 stripper 88 cam groove 100 synthetic resin cap 106 annular inner side wall 108 annular outer side Wall 110 Annular body 118 Bridge 120 Cut surface R Delivery area E Emission area

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 27, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

According to the present invention, there is provided, in accordance with the present invention, an annular body having an annular inner wall and an annular outer wall surrounding the annular inner wall. The outer wall is used to form the inner wall and the outer wall of a synthetic resin product that is interconnected via a plurality of breakable bridging portions arranged at least in a circumferential direction. An apparatus for forming an annular double wall on a synthetic resin product for cutting the annular body into an annular shape at a radially intermediate portion while leaving at least each of the bridging portions after integrally molding the product. A rotary anvil, a rotary turret plate fixed on the rotary anvil and having a plurality of notches on a peripheral edge thereof for receiving and transporting a part of the outer periphery of the product; and a rotating turret plate corresponding to each of the notches. Positioning of the product on the rotating anvil A working position for positioning the product at the cutting position by raising the positioning member to engage the product, and a non-working position for lowering the positioning member from the working position to release the engagement. And a cutter holder comprising a stripper and an annular cutter disposed above and corresponding to each of the notches so as to rotate integrally with the rotary anvil. Means, the cutter holding means is lowered, the stripper presses the product, the cutting position of the cutter cuts the intermediate portion of the annular body into an annular shape, and the cutter holding means is raised from the operating position. A second lifting means for positioning the cutter and the stripper in a non-operating position where the cutter and the stripper are separated upward from the product, forming an annular double wall in the synthetic resin product. Do Location, is provided.

Claims (2)

[Claims] 1. An annular body having an annular inner wall and an annular outer wall surrounding the periphery of the annular inner wall, and a locked means provided on an inner peripheral surface of the inner wall at an outer peripheral portion on the container side. Locking means to be locked to the inner wall and the outer wall,
Forming the inner and outer walls of a synthetic resin product interconnected via a plurality of breakable bridging portions arranged at least circumferentially apart from each other to form the product. An apparatus for forming an annular double wall in a synthetic resin product for cutting the annular body into an annular shape at a radially intermediate portion while leaving at least each of the bridging portions after molding, comprising: a rotating anvil; A rotating turret plate having a plurality of notches on its periphery fixed on the rotating anvil and receiving and transporting a part of the outer periphery of the product; and disposed on the rotating anvil corresponding to each of the notches. A positioning member for positioning the product at the cutting position by raising the positioning member to engage with the product; and positioning the product by lowering the positioning member from the operation position. Cancel A first lifting / lowering means for positioning the cutting device in a non-operating position, and a stripper and an annular cutter disposed above each of the notches so as to be integrally rotated with the rotary anvil. The cutter holding means, the cutter holding means is lowered, the stripper presses the product, the cutting position of the cutter cuts the intermediate portion of the annular body in an annular shape, and the cutter holding means comprises: A second lifting means for raising the cutter and the stripper from a working position to a non-working position in which the cutter and the stripper are separated upward from the product. Equipment for forming heavy walls. 2. The cutter according to claim 1, wherein a blade is formed on one side in the width direction of a rectangular flat plate member having a predetermined width and length over the entire length in the longitudinal direction, and then the flat plate member is formed into an annular shape. The apparatus for forming an annular double wall in the synthetic resin product according to claim 1, which is formed by performing the following steps.