JPH04239609A - Compression molding apparatus - Google Patents

Abstract

PURPOSE:To improve a compression molding apparatus for compression molding a synthetic resin handle body and integrally coupling it to the coupling projection member of a vessel cap main body whereby a synthetic resin raw material is allowed to sufficiently flow over both surfaces of the coupling projection member thereby to enable the handle body to be compression molded excellently, and also improve the apparatus so that the vessel cap main body and compression molded handle body can be discharge readily promptly from the mold. CONSTITUTION:A compression molding apparatus is equipped with a mold comprising a first mold part 94 and a second mold part. The first mold part 94 includes a movable material 99 which can move freely between the molding position and the spacing position. On the movable material 99, a support surface is formed which functions to support the skirt wall of the vessel cap main body, and thereon a supporting projection is also formed which serves to support the coupling projection member of the vessel cap main body. Furthermore, a movable material shifting mechanism 127 is disposed therein which acts to position the movable material to the molding position and spacing position selectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding device for molding a synthetic resin grip for a container lid and simultaneously connecting it integrally to a connecting protrusion on a container lid body.

[0002] Japanese Unexamined Patent Publication No. 1787730/1987 states that
As a preferred example of an easy-to-open container lid, a container lid that includes a metal container lid body and a synthetic resin grip is disclosed. The container lid body, which is formed from a suitable thin metal plate such as an aluminum-based alloy thin plate, has a circular top wall, a skirt wall that hangs down from the periphery of the circular top wall, and a connecting protrusion that projects from the lower end of the skirt wall. The synthetic resin gripper is molded from a suitable synthetic resin such as polyethylene or polypropylene, and includes a connecting base that surrounds at least the free end of the connecting protrusion of the container lid body, and a ring-shaped extension extending from the connecting base. It has a ring part.

On the other hand, Japanese Patent Application Laid-Open No. 63-302010 discloses a compression molding apparatus for molding a synthetic resin gripping body and simultaneously connecting it integrally to a connecting protrusion of a container lid body. Such a compression molding apparatus includes a mold consisting of a first mold part and a second mold part that are relatively moved in a predetermined opening/closing direction to open and close. The first mold section has a housing space and a first molding recess. The second mold section has a second molding recess and a through-hole extending in a predetermined direction from the second molding recess, and a compression rod is slidably inserted into the through-hole. The first molding recess and the second molding recess cooperate to define a molding space. The container lid main body is accommodated in the accommodation space of the first mold part, and at least the free end of the connecting protruding piece of the container lid main body is made to protrude into the molding space. A synthetic resin in a heated and molten state is supplied to the through-hole of the second mold part, and the synthetic resin is compressed by a compression rod and compression-molded into a gripping body having a shape corresponding to the molding space.

0004

SUMMARY OF THE INVENTION The conventional compression molding apparatus described above has the following problems to be solved. First, according to the experience of the present inventors, the synthetic resin flowing into the molding space from the through-hole of the second mold part collides with one side of the connecting protrusion piece of the container lid main body. Press the connecting protruding piece against the bottom of the first molded recess,
Due to this, the synthetic resin does not flow sufficiently to the other side of the connecting protruding piece, and the synthetic resin covering the other side of the connecting protruding piece becomes extremely thin, or the other side of the connecting protruding piece becomes localized. It tends to be exposed. When such occurrence occurs, the connection strength of the gripping body to the container lid main body is reduced, and the appearance of the container lid deteriorates, resulting in the production of a defective container lid that is not acceptable as a product.

Second, when the mold is opened after the synthetic resin grip is compression-molded, the molded grip is separated from the second mold part and is inserted into the first mold part together with the container lid body. be placed above. Therefore, following the opening movement of the mold, it is necessary to eject the molded grip body together with the container lid body from the first mold part. However, at the time of opening of the mold, since the gripping body is partially embedded in the first molding recess in the first mold part,
It is not easy to quickly discharge the gripper together with the container lid body from the first mold section. Furthermore, according to the experience of the present inventors, undesirable deformation is often generated in the gripping body when it is discharged from the first mold section.

The present invention has been made in view of the above-mentioned facts, and its main technical problem is to make the synthetic resin sufficiently flow on the other side of the connecting protrusion of the container lid main body; Therefore, the occurrence of defective container lids can be reliably avoided, and after the mold is opened, the grip body, which is integrally connected to the container lid body and its connecting protrusion, can be removed sufficiently quickly without causing any undesirable deformation. To provide an improved compression molding device for compression molding a synthetic resin gripping body which can be discharged from a first mold part and simultaneously connecting it integrally to a connecting projection piece of a container lid body. .

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned main technical problem, in the present invention, (1) the first mold part has a space between the molding position and the remote position in the opening/closing movement direction. A movable member is disposed to be movable, and includes a supporting surface that supports at least a portion of the skirt wall of the container lid body, and a supporting surface that supports at least a portion of the skirt wall of the container lid body, and also protrudes into the first molding recess at the molding position to support the connecting protrusion piece of the container lid body. (2) a movable member moving mechanism for selectively positioning the movable member of the first mold portion between the molding position and the separated position; (3) Compression molding of the gripper is performed while the movable member of the first mold section is positioned at the molding position, and the first mold section and the second mold section are The movable member is moved to the separated position simultaneously with or following the relative opening movement.

That is, according to the present invention, there is provided a mold consisting of a first mold part and a second mold part which are moved relative to each other in a predetermined opening/closing direction to open and close. The first mold part has a housing space and a first molding recess,
The second mold section has a second molding recess and a through introduction hole extending in a predetermined direction from the second molding recess, and a compression rod is slidably inserted into the through introduction hole. ,
The first molding recess and the second molding recess cooperate to define a molding space for molding a synthetic resin grip, and the housing space of the first mold part has a circular shape. A metal container lid main body having a top wall, a cylindrical skirt wall hanging down from the periphery of the top wall, and a connecting protruding piece protruding from the lower end of the skirt wall is housed, and the connecting protruding piece of the container lid main body is At least the free end portion is made to protrude into the molding space, a synthetic resin is supplied to the through-introduction hole of the second mold part, and the synthetic resin is compressed by the compression rod to correspond to the molding space. In a compression molding device for compression molding a synthetic resin gripping body, which is compression molded into a shaped gripping body, and simultaneously connecting it integrally to a connecting protrusion piece of a container lid body,
The first mold part is composed of a mold member in which the first molding recess is formed and a movable member mounted so as to be movable between a molding position and a remote position in the opening/closing direction, and The movable member includes a support surface that supports at least a portion of the skirt wall of the container lid body, and a support surface that protrudes into the first molding recess at the molding position to support the connecting protrusion piece of the container lid body. A support protrusion is formed to separate the first molding recess from the bottom surface, and a movable member moving mechanism is provided for selectively positioning the movable member of the first mold portion between the molding position and the separated position. is arranged, compression molding of the gripper is performed while the movable member of the first mold section is positioned at the molding position, and the first mold section and the first mold section are Simultaneously with or following the relative opening movement with the second mold part, the movable member is moved to the separation position, whereby the compression-molded grip body is separated from the first molding recess. A compression molding apparatus is provided.

[0009]

[Function] In the compression molding apparatus of the present invention, the movable member of the first mold section is formed so that the connecting projection piece projected into the molding space is pressed against the bottom surface of the first molding recess. Therefore, a synthetic resin flow gap is reliably maintained between the bottom surface of the first molded recess and the connecting protrusion, and thus the synthetic resin also flows on the other side of the connecting protruding piece. is made to flow sufficiently, and a good gripping body as required is compression molded.

[0010] Furthermore, in the compression molding apparatus of the present invention,
Simultaneously with or following the opening movement of the mold, the movable member of the first mold section is moved to the separating position, thereby separating the compression-molded gripper from the first molding recess and thus The state in which the grip body is buried in the first molding recess disappears, and thus the grip body integrally connected to the connecting protrusion piece is sufficiently easily and quickly discharged from the first mold part together with the container lid body. be able to. Since the movable member acts on the container lid body rather than on the molded gripper, no undesirable deformations of the gripper are created.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a molding apparatus constructed according to the present invention will be described in detail below.

Overview of a System Including a Molding Apparatus FIG. 1 schematically depicts a portion of a molding system including a preferred embodiment of a molding apparatus improved in accordance with the present invention. The system includes a forming device 6 improved according to the invention, as well as a perforation device 2 and a rotary container lid body transport device 4, of which part is shown.

FIGS. 2 and 3 show an example of a container lid main body 8 carried from the punching device 2 to the molding device 6 via the container lid conveying device 4. The container lid body 8, which can be formed from a suitable metal sheet such as an aluminum-based alloy sheet, a chromic acid-treated steel sheet, or a tin plate, has a circular top wall 10.
, a cylindrical skirt wall 12 that hangs down from the periphery of the top wall 10, and a connecting protrusion piece 14 that protrudes from the lower end of the skirt wall 12. Conveniently, the projecting piece 14 projects downwardly from the lower end of the skirt wall 12 and then slopes downwardly and radially outwardly at an angle of inclination α which may be between 15 and 60 degrees. A plurality of (three in the illustrated case) holes 18 are formed in the inclined extending portion of the protruding piece 14 in order to increase the connection strength of the grip body, which will be described later. Such a hole 18 is drilled by the punching device 2. The configuration of the punching device 2 itself is disclosed in, for example, Japanese Patent Application Laid-open No. 15237/1982 or Japanese Patent Application No. 121361/1999 filed by the present applicant (filing date: May 1, 1999).
The invention may be disclosed in the specification and drawings of the invention (Title of invention: perforation device) on the 7th, and its detailed explanation will be left to those disclosures and will be omitted in this specification. In the illustrated container lid main body 8, a substantially triangular notch 20 is further formed in the skirt wall 12 on both sides of the proximal end of the protruding piece 14, and a breaking line 22 is formed extending upward from the notch 20. Further, a breaking line 24 extending upward from the lower end of the skirt wall 12 is also formed at each portion of the projecting piece 14 at an angular interval of approximately 90 degrees on both circumferential sides from the circumferential center. The breaking lines 22 and 24 may be so-called scores or slits. The peripheral edge of the top wall 10 is raised upward, and a synthetic resin annular liner 26 is disposed on the inner surface of the raised part.

Continuing the explanation with reference to FIG. 1, the rotary container lid body conveying device 4 has a rotary support 30 that is continuously rotated in the direction shown by an arrow 28. This support 3
0, a plurality of container lid body receiving portions 32 are arranged at intervals in the circumferential direction. In the container lid body receiving area indicated by numeral 34, the container lid body 8, in which the hole 18 is bored in the protruding piece 14, is attached to the support with its top wall 10 facing radially inward and its protruding piece 14 facing upward. It is carried into each of the 30 container lid main body receiving parts 32. The container lid body 8 is conveyed from the container lid receiving area 34 to the container lid body delivery area indicated by the number 38 as the support body 30 rotates, and is transferred from the container lid body conveying device 4 in the container lid body delivery area 38. It is transferred to the molding device 6. The structure of the container lid main body conveying device 4 itself is disclosed in Japanese Patent Application No. 2-235592 filed by the present applicant.
(Filing date: September 7, 1990, Title of invention: Rotary container lid conveying device), and the detailed explanation thereof may be disclosed in the specification and drawings of , and will be omitted in this specification.

Referring to FIG. 1, the illustrated molding device 6 includes a rotary compression molding means 40 and a resin material supplying means 4.
2 and a discharge means 44. Compression molding means 40
is a stationary support shaft 46 extending substantially vertically;
The rotary support 48 is rotatably mounted on the rotary support 48 . A plurality of molds 50 (the molds 50 will be described in more detail later) are arranged on the rotary support 48 at intervals in the circumferential direction. The rotary support 48 of the compression molding means 40 is continuously rotated in the direction shown by the arrow 52, so that each of the molds 50 has a container lid body receiving area 54, a resin material receiving area 56, a compression molding area 58, and an ejection area. The area 60 is sequentially conveyed. In the container lid body receiving area 54 corresponding to the container lid body delivery area 38 of the rotary container lid conveying device 4, the container lid body 8 is carried into each of the molds 50. In the resin material receiving area 56,
A synthetic resin material in a heated and molten state is supplied from the resin material supply means 42 to each of the molds 50 (the supply of the synthetic resin material from the synthetic resin material supply means 42 to each of the molds 50 will be further described later). . While the mold 50 is moved through the compression molding area 58, the synthetic resin material is compression molded into the desired gripping body, and the protruding piece 1 of the container lid body 8 is compressed.
4 is integrally connected. In the discharge area 60, a container lid equipped with a synthetic resin grip is placed in the mold 50.
is discharged from. The ejection means 44 is composed of a conveyor belt mechanism including an endless conveyor belt 62 driven in the direction shown by an arrow 61. A switching lever 64 is disposed above the endless conveyor belt 62 and can be selectively positioned between a non-operating position indicated by a solid line and an operating position indicated by a two-dot chain line. When the container lid manufactured as required is discharged from the mold 50 onto the endless conveyor belt 62, the switching lever 64 is positioned in the non-active position shown by the solid line. In this case, the container lid discharged onto the endless conveyor belt 62 is conveyed by the endless conveyor belt 62 to a required area (for example, an inspection/counting/packaging area). On the other hand, if the container lid discharged from the mold 50 is an incomplete, defective product, the switching lever 64 is positioned at the operating position shown by the two-dot chain line. In this case, the container lid discharged onto the endless conveyor belt 62 is introduced into the collection box 66 by the action of the switching lever 64 without being conveyed on the endless conveyor belt.

FIGS. 4 and 5 illustrate a container lid 70 having a synthetic resin handle 68 molded as required in the compression molding means 40. As shown in FIGS. A gripping body 6 compression molded from a suitable synthetic resin such as polypropylene or polyethylene.
8 has a connecting base 72 and a ring portion 74 extending from the connecting base 72 in a ring shape. The connecting base 72 of the grip 68 surrounds the tip of the protruding piece 14 of the container lid body 8,
It is integrally connected to this. The synthetic resin material molded into the grip body 68 also flows into the hole 18 formed in the protrusion piece 14 of the container lid body 8 and is hardened, so that the grip body 68 is molded into the protrusion piece 14 of the container lid body 8. is sufficiently firmly connected to the

Molding Apparatus Next, the improved molding apparatus 6 according to the present invention, and in particular its compression molding means 40, will be described in detail.

Referring to FIG. 6, the rotary compression molding means 40 in the molding apparatus 6 includes a stationary support block 78 having a substantially disk shape, and the stationary support shaft 46 is fixed to the stationary support block 78. ing. An annular flange 80 is formed at the lower end of the support shaft 46 , and the flange 80 is inserted into a recess 82 formed on the upper surface of the support block 78 and fixed to the support block 78 with fastening bolts 84 . . The rotary support body 48 has a substantially cylindrical shape surrounding the support shaft 46, and the support block 7
8 and a support shaft 46 fixed thereto via an upper bearing 86 and a lower bearing 88 so as to be freely rotatable. An input gear 9 is provided at the lower end of the rotation support 48.
0 is fixed, and the input gear 90 is drivingly connected to a drive source 92, which may be an electric motor, via a suitable transmission mechanism (not shown). Thus, when the drive source 92 is energized, the rotary support 48 is driven to rotate at a predetermined speed in the direction shown by the arrow 52 in FIG.

The rotary support body 48 is provided with the mold 50.
A plurality of (in the illustrated embodiment, 12 as shown in FIG. 1) are mounted at equal intervals in the circumferential direction. Each of the molds 50 includes a first mold part 94 and a second mold part 96. More specifically, an annular support flange 98 is formed at the lower part of the rotary support 48, and a first mold part 94 of each of the molds 50 is fixed to the upper surface of the annular support flange 98. . To explain with reference to FIGS. 8 and 9, the first mold part 94
Each includes a support member 95, a mold member 97, and a movable member 99. A circular hole 101 penetrating vertically is formed in the support member 95, and the circular hole 101 is formed in the mold member 97.
A screw hole 103 is formed that vertically penetrates through the support member 95 by screwing a fastening bolt 105 into the screw hole 103 through the circular hole 101.
7 is fixed. The support member 95 itself is inserted into the support member 95 through the annular support flange 98 of the rotating support 48.
It is fixed in position on the annular support flange 98 by threading a fastening bolt (not shown) into the annular support flange 98 . On the upper surface of the mold member 95 in the first mold section 94, there is a horizontal portion 106 that extends substantially horizontally, and an inclined portion 108 that slopes somewhat downwardly from the horizontal portion 106 toward the outside in the radial direction.
exists. Then, from the inclined part 108 to the horizontal part 106
a first molded recess 110 extending in a ring shape toward
is formed. A pair of short shafts 118 are also provided on the upper surface of the support member 95 on both sides of the first molding recess 110 in the circumferential direction and protrude substantially vertically upward.

Continuing the explanation with reference to FIGS. 8 and 9,
A groove 102 extending substantially horizontally in an arc shape is formed on the front surface, that is, the outer circumferential surface of the support member 95 in the first mold portion 94 . Further, a recessed portion for mounting the movable member 99 is formed in the circumferential center of the outer circumferential surface of the support member 95 . The radial depth of this recessed portion is greater than the radial depth of the groove 102. Movable member 9
A lower receiving part 107 and an upper restraining part 89 are arranged on the front surface of the lower receiving part 107, and an arcuate support surface 109 facing upward is formed in the lower receiving part 107, and the upper restraining part 89 has a circumferential direction. A pair of arcuate restraint surfaces 11 facing each other with an interval of
1 is formed. The curvature of the support surface 109 and the restraint surface 111 corresponds to the curvature of the skirt wall 12 of the container lid body 8. The support surface 109 and the restraint surface 111 define an accommodation space 93 for receiving the container lid body 8. A vertically intermediate region between the lower receiving part 107 and the upper restraining part 89 is retracted radially inward. The recessed surface in the intermediate region is positioned substantially radially in alignment with, or somewhat radially inward from, the radial bottom surface of the groove 102 formed in the support member 95. A support projection 115 is formed at the center of the upper surface of the movable member 99 and projects substantially vertically upward. Furthermore, a hanging piece 119 is formed at the center of the lower surface of the movable member 99 and projects substantially vertically downward. On the other hand, the mold member 97
A through hole 121 extending in the vertical direction is formed in the front surface of the holder. As clearly shown in FIGS. 8 and 9, the movable member 99 inserts its support protrusion 115 into a through hole 121 formed in the mold member 97, and positions its hanging piece 119 in front of the support member 95. Then, it is attached to a recessed portion formed in the support member 95. The movable member 99 moves vertically between the molding position shown by the solid line in FIGS. 8 and 9 and the separated position shown by the two-dot chain line in FIG. It is mounted so as to be movable in the opening/closing direction with respect to the mold part 96). The support protrusion 115 formed on the upper surface of the movable member 99
Even when the mold member 9 is positioned at the molding position, the mold member 97 is projected upwardly beyond the upper surface of the mold member 97 and therefore beyond the bottom surface of the first molding recess 110 formed therein. is important. As shown in FIG. 9, the rear part of the movable member 99 has a blind hole 123 extending downward from the top surface.
is formed, and the blind hole 123 accommodates an elastic biasing means 125, which may be a compression coil spring. The upper end of this elastic biasing means 125 is brought into contact with the lower surface of the mold member 97, and the elastic biasing means 125 moves the movable member 99 downwardly with respect to the mold member 97, thus causing the molding shown in solid lines in FIGS. Elastically biased into position. First mold part 94
The cam mechanism 1 is associated with the movable member 99 in each of the
27 are arranged. The cam mechanism 127 and the elastic biasing means 125 constitute a movable member moving mechanism. Continuing the explanation with reference to FIGS. 8 and 9, the rotating support 4
The annular support flange 98 of No. 8 is formed with a through hole 129 that is aligned with the hanging piece 119 of the movable member 99 and extends in the vertical direction. The hanging piece 119 of the movable member 99 is inserted into this through hole 129. A cam rod 131 is also inserted into the through hole 129 formed in the annular support flange 98 . The cam rod 131 projects downward beyond the lower surface of the annular support flange 98, and has a horizontal short shaft 1 at its lower end.
33 is fixed, and a cam roller 135 is rotatably mounted on this short shaft 133. On the other hand, the annular support flange 9
An annular stationary cam member 137 is disposed below 8. This stationary cam member 137 is fixed to the support block 78 (FIG. 6) via a suitable support member (not shown). An annular cam groove 139 is formed on the outer peripheral surface of the stationary cam member 137, and the cam roller 135 is accommodated in this cam groove 139. In the normal state, as shown by the solid line in FIGS. 8 and 9, the cam rod 131
The upper end of the movable member 99 is located slightly below the lower end of the hanging piece 119, and therefore the movable member 99 is positioned at the forming position by the elastic biasing action of the elastic biasing means 125. On the other hand, as will be further described later, when discharging the gripper 68 molded together with the container lid body 8 from the first mold section 94, the cam rod 131 is raised and the elastic biasing action of the elastic biasing means 125 is applied. In response, the movable member 99 is raised to the separated position shown by the two-dot chain line in FIG. 9 (see also FIG. 17). When the container lid body 8 is supplied to the mold 50 in the container lid body receiving area 54, the movable member 99 is returned to the molding position, and as shown by the two-dot chain line in FIGS. The main body 8 is accommodated in the accommodation space 93 with the skirt wall 12 placed on the support surface 109 with the top wall 10 facing outward in the radial direction and the connecting protrusion piece 14 facing upward. . The restraining surface 111 is brought into close proximity to or in contact with the outer peripheral surface of the skirt wall 12. The connecting protruding piece 14 of the container lid body 8 is connected to the first molding recess 11 formed on the upper surface of the mold member 97.
0 and is supported by the support protrusion 115 of the movable member 99. The support protrusion 115 that protrudes upward beyond the upper surface of the mold member 97 supports the connecting support protrusion piece 14 of the container lid body 8 and maintains it separated upward from the bottom surface of the first molding recess 110. do. The container lid main body 8 accommodated in the accommodation space 93 of the first mold part 94 is moved radially outward by a stationary guide 111 extending in an arc shape adjacent to the outer peripheral surface of the first mold part 94. (Fig. 1).

Continuing the explanation with reference to FIG. 6, a relatively thick support flange 120 is provided on the upper part of the rotary support 48.
is formed. This support flange 120 includes a plurality of support flanges (12 in the illustrated case) at equal intervals in the circumferential direction.
2) substantially vertically extending grooves 122 are formed. Each such groove 122 is located in substantially vertical alignment with each of the first mold sections 94 . Groove 12
2 each has a rectangular cross-sectional shape and its outer surface is open. Plate members 124 are fixed to the outer peripheral surface of the support flange 120 in correspondence with each of the grooves 122. Each of the plate members 124 closes off the outer surface of the groove 122. A substantially vertically extending groove 126 is also formed on the outer surface of each plate member 124 . The groove 126 also has a rectangular cross-sectional shape, and its outer surface is open. Furthermore, the plate member 1
A plate-like member 128 that closes the outer surface of the groove 126 is provided on the outer surface of the groove 24.
is fixed. Grooves 122 and 126 are arranged in radial alignment. A main elevating member 130 is accommodated in the groove 122 so as to be movable up and down, and a sub elevating member 132 is accommodated in the groove 126 so as to be movable up and down. Each of the main elevating member 130 and the sub elevating member 132 has a support flange 12
0 and has substantially horizontally extending shafts 134 and 136 fixed to their upper ends. Rollers 138 and 140 are rotatably mounted on the shaft 134, and a roller 142 is rotatably mounted on the shaft 136. Rollers 138, 140 and 142 constitute cam followers. On the other hand, a substantially cylindrical cam block 144 is fixed to the upper end of the stationary support shaft 46, and a cam groove 1 is formed on the outer peripheral surface of the cam block 144.
46 and 148 are formed. The rollers 138 and 140 disposed on the main elevating member 130 are acted on by the lower and upper surfaces of the cam groove 146, respectively, so that the auxiliary elevating member 13
The roller 142 disposed at the cam groove 148 is actuated by the upper and lower surfaces of the cam groove 148, and when the rotary support 48 is rotated in the direction indicated by the arrow 52 in FIG. It can be moved up and down as required.

Continuing the explanation with reference to FIG. 7 as well as FIG. 6, a suspension shaft 150 is fixed to the lower end of the main elevating member 130. Specifically, the main elevating member 130 is formed with a female threaded hole 152 extending upward from its lower end.
A male thread is formed in the upper part of the suspension shaft 150. Screw the male thread of the suspension shaft 150 into the female thread hole 152,
Then, by screwing the locking nut 154 onto the male thread of the suspension shaft 150, the suspension shaft 150 is attached to the main elevating member 13.
Fixed to 0. A connecting member 156 is attached to the lower part of the hanging shaft 150. The connecting member 156 has a horizontal upper wall portion 158, a vertical wall portion 160, and a horizontal lower wall portion 162. The horizontal upper wall portion 158 has a through hole 1 extending in the vertical direction.
64 is formed, and the lower part of the suspension shaft 150 is slidably inserted into the through hole 164. Hanging shaft 150
A male thread is formed at the lower end of the nut 1.
66 and 168 are screwed together, thus preventing the connecting member 156 from falling off from the suspension shaft 150. Hanging shaft 1
An overhanging flange 170 is integrally formed in the vertically intermediate portion of 50, and the flange 170 and the connecting member 15
A plurality of plate springs 172 are disposed between the upper surface of the horizontal upper wall portion 158 of No. 6 and the upper surface of the horizontal upper wall portion 158 of No. 6. The disc spring 172 elastically biases the connecting member 156 downward, and the horizontal upper wall portion 1 of the connecting member 156 is biased downwardly.
58 is elastically held in the illustrated position where the lower surface of nut 166 abuts.

The second mold part 96 is fixed to the lower surface of the horizontal lower wall part 162 of the connecting member 156. Such fixing is achieved by passing through the horizontal lower wall portion 162 of the connecting member 156 and screwing a fastening bolt (not shown) into a female screw hole 174 (FIG. 12) extending downward from the upper surface of the second mold portion 96. It is carried out by urging. Referring to FIGS. 10 to 12 together with FIG. 7, the second mold portion 96 has a substantially fan shape. A main portion 176 and a main portion 17 extending substantially horizontally are provided on the lower surface of the second mold portion 96.
There is a ramp 178 that slopes radially outwardly from 6 and somewhat downwardly. Such main portion 176 and inclined portion 17
8 correspond to the main portion 106 and the inclined portion 108 on the upper surface of the first mold portion 94, respectively. A second molding recess 180 extending in a ring shape is formed on the lower surface of the second mold portion 96 . When the second mold part 96 is lowered as described below and the lower surface of the second mold part 96 is brought into close contact with the upper surface of the first mold part 94, the second mold part 96 A second molding recess 180 formed in the mold part 96 cooperates with a first molding recess 110 formed in the first mold part 94 to define a molding space. The connecting protruding piece 14 of the container lid main body 8 supplied to the first mold part 94 enters the molding space from the outside in the radial direction. The second mold portion 96 is further formed with a through-hole 182 extending substantially vertically from the radially outer side of the second molding recess 180 . Figures 11 and 12
As clearly shown in the figure, the cross-sectional shape of the through-hole 182 is approximately trapezoidal, and an arcuate convex portion 184 is present at the center of the radially inner side (the base of the trapezoid). Therefore, the through-introduction hole 182 is formed in the middle part of the second mold part 96 when viewed in the conveyance direction indicated by the arrow 52, and has the minimum radial dimension, that is, the width (W2
) has the minimum width part. As clearly shown in FIG. 10, a relatively large notch 186 is formed in the outer peripheral surface of the second mold section 96. The notches 186 are approximately L-shaped as a whole, and include a full circumferential notch 188 that extends over the entire circumferential direction of the outer circumferential surface of the second mold part 96, and a full circumferential notch 188 extending below the full circumferential notch 188. It has a semicircular notch 190 that exists only in the front half of the outer peripheral surface of the second mold part 96 in the conveying direction. The full circumference notch 188 opens the entire circumference of the through-hole introduction hole 182. The semicircular notch 190 opens the front half of the through-hole 182 in the conveyance direction. This portion of the through-hole 182, that is, the portion whose front side in the conveying direction is opened by the semicircular cutout portion 190, constitutes a resin receiving portion 192 that receives the synthetic resin in a heat-softened state, as will be described in detail later. As can be understood by referring to FIG. 7 together with FIGS. 10 and 11, the second mold section 96 further includes a second mold section 96 on both circumferential sides of the second mold recess 180 formed on its lower surface. A pair of holes 194 are formed that extend substantially vertically upward from the main portion 176 on the lower surface, and a metal bush 196 is press-fitted into each of the holes 194 . Figure 7
As shown in FIG.
8 is inserted, thus positioning the mutually cooperating first mold part 94 and second mold part 96 relative to each other as desired.

Continuing the explanation with reference to FIGS. 6 and 7,
A suspension member 200 is connected to the lower end of the sub-elevating member 132 via an adjustment mechanism 198. Specifically, the sub-elevating member 132 has a female threaded hole 202 extending upward from its lower surface, and the suspension member 200 has a female threaded hole 204 extending downward from its upper surface. The female threaded hole 202 has a right-handed thread, and the female threaded hole 204 has a left-handed thread. A shaft member 208 having a hexagonal flange portion 206 integrally formed in the vertically intermediate portion thereof has a right-handed male thread formed in its upper half, and a left-handed male thread formed in its lower half. The upper half of the shaft member 208 is screwed into the female screw hole 202 of the sub-elevating member 132 and fastened with a locking nut 210, and the lower half of the shaft member 208 is screwed into the female screw hole 204 of the suspension member 200. hand,
It is fastened with a locking nut 212. When the locking nuts 210 and 212 are loosened and the shaft member 208 is rotated in a clockwise direction, the suspension member 200 (therefore, the compression rod 216, which will be described later) is raised relative to the sub-elevating member 132, and conversely, the shaft member 208 When is rotated in the left-hand thread direction, the suspension member 200 (therefore, the compression rod 216 described later) is lowered with respect to the sub-elevating member 132. A notch 214 that is open downward is formed in the radially inner lower part of the suspension member 200.
14 houses an enlarged head 218 of a compression rod 216. A guide pin 220 having a shaft portion that hangs down substantially vertically is fixed in the notch 214, while a through guided hole 222 that extends in the vertical direction is formed in the enlarged head 218 of the compression rod 216. , through guided hole 22
The shaft portion of the guide pin 220 is slidably inserted through the guide pin 220. A plurality of disc springs 22 are arranged around the shaft portion of the guide pin 220.
4 is placed. The disc spring 224 resiliently biases the compression rod 216 downwardly. A stop plate 226 located below the enlarged head 218 of the compression rod 216 is fixed to the lower surface of the suspension member 200 by a bolt 228, and the lower surface of the enlarged head 218 of the compression rod 216 hits this stop plate 226. By being in contact with the compression rod 21
6 is restricted from descending. The compression rod 216 has a rod main portion 230 extending downward beyond the stop plate 226, and the rod main portion 230 is inserted into the through-hole 182. As shown in FIG. 11, the cross-sectional shape of the rod main portion 230 of the compression rod 216 is made to be substantially the same as the cross-sectional shape of the through-hole 182.

Referring to FIGS. 13 and 14 as well as FIG. 1, the resin material supplying means 42 disposed in relation to the resin material receiving area 56 is connected to the extruder main body 232.
and an extrusion block 234 fixed to the tip of the extruder main body 232. The extrusion block 234 has a base 236 that extends substantially vertically and a protrusion 238 that extends substantially horizontally from the upper end of the base 236 . A fastening bolt 240 is threaded through the lower part of the base 236 to the front end surface of the extruder main body 232, thereby fixing the extrusion block 234 to the front end of the extruder main body 232. The protrusion 238 of the extrusion block 234 has a substantially horizontally extending lower surface 242. An extrusion path 246 is formed in the extrusion block 234 and extends inside the protrusion 238 from an inlet end connected to the downstream end of an extrusion path 244 formed in the extruder main body 232. The extrusion channel 246 extends substantially horizontally within the protrusion 238 from the inlet end to the tip and then downwardly to the lower surface 242 .
It is open to The extrusion port 248 of the extrusion path 246 that opens on the lower surface 242 is arranged in the conveying direction of the second mold part 96,
That is, it extends in a long and narrow direction in the direction indicated by the arrow 52, and gradually becomes wider toward the downstream side when viewed in the conveying direction.

To explain the operation in the resin material receiving area 56, when passing through the resin material receiving area 56, the mold 5
Component 0 is in the position shown in FIG. That is, the second mold part 96 attached to the main lifting member 130 is in a raised position separated upward from the first mold part 94,
The compression rod 216 attached to the sub-elevating member 132 is raised such that the lower end of the rod main portion 230 is located above the circumferential notch 188 formed in the second mold portion 96. . As understood by referring to FIG. 13 together with FIG. 14, the protruding portion 238 of the extrusion block 234 in the resin material supplying means 42 is a circumferential notch 188 formed on the outer peripheral surface of the second mold portion 96. The lower surface 242 protrudes inward and has an extrusion port 248 formed therein.
It is located in contact with or close to the upper surface of the resin receiving portion 192 of the through-hole introduction hole 182 . When the resin receiving portion 192 of the through-hole introduction hole 182 moves in the direction shown by the arrow 52 due to the rotation of the rotary support 48, the extrusion port 248 of the extrusion block 234 moves.
The resin material 250 extruded downward from the resin receiving part 1
It is received into the resin receiving part 192 through the open front half of the resin 92 in the conveyance direction. The resin receiving portion 192 is further
When further moved in the direction indicated by 2, the lower surface 242 of the protruding portion 238 of the extrusion block 234 and the resin receiving portion 192
The cutting action in cooperation with the upper surface of the resin receiving part 1
The resin material 250 received in the resin material 92 is cut, and thus the resin material 250 is supplied into the resin receiving portion 192 and is moved together with the resin receiving portion 192.

Continuing the explanation with reference to FIGS. 15 and 16 together with FIGS. 1 and 6, the mold 50 of the compression molding means 40
When passing through the compression molding area 58, the main elevating member 130 and the sub elevating member 132 are appropriately lowered. In the state shown in FIG. 15, the second mold part 96 is lowered by lowering the main elevating member 130, and the lower surface of the second mold part 96 is brought into close contact with the upper surface of the first mold part 94. ,
The first mold part 94 and the second mold part 96 cooperate to define a molding space that extends in a ring shape. On the other hand, the lower end of the rod main portion 230 of the compression rod 216 is located above the resin receiving portion 192 (the resin material 250 has already been received in the resin receiving portion 192) in the through introduction hole 182. The sub-lifting member 132 continues to be lowered further, and the compression rod 216 is lowered to the position shown in FIG. 16. At this time, the rod main portion 230 of the compression rod 216 acts on the resin material 250 existing in the resin receiving portion 192, forcing the resin material 250 into the molding space through the through-introduction hole 182 and compressing it. . In this way, the resin material 250 has a shape that corresponds to the molding space.
That is, it is molded into a grip 68 as shown in FIGS. 4 and 5. At the same time, since the protruding piece 14 of the container lid main body 8 is made to protrude into the molding space, the connecting base 72 of the molded grip 68 surrounds the tip of the protruding piece 14, thereby causing the grip 68 to protrude. It is integrally connected to the piece 14. As is well known to those skilled in the art, it is extremely difficult, if not impossible, to precisely control the amount of resin material 250 supplied to resin receiving portion 192 to a predetermined value, and the amount of resin material 250 is Some errors exist. In the illustrated embodiment,
The amount of resin material 250 supplied is set slightly excessively,
The excess amount of the resin material 250 is compensated by the compression rod 216 rising slightly against the elastic biasing action of the disc spring 224 at the end of compression molding.

As can be easily understood by referring to FIGS. 15 and 16, the resin material 250 is inserted into the through-hole 18 by the action of the rod main portion 230 of the compression rod 216.
2 into the molding space, the resin material 250 collides with the upper surface of the protruding piece 14 of the container lid body 8 that protrudes into the molding space, so that the protruding piece 14 is forced downward. The pressure to do so is applied. However, in the compression molding device 6 improved according to the present invention, the support protrusion 11 formed on the movable member 99 of the first mold section 94
5 is made to protrude upward from the bottom surface of the first molding recess 110, and the protruding piece 14 of the container lid body 8 is supported by this support protrusion 115. Therefore, the pressure applied to the protruding piece 14 from the resin material 250 reliably prevents the protruding piece 14 from being forced downward and coming into contact with or approaching the bottom surface of the first molded recess 110. It continues to be reliably maintained in a state separated from the bottom surface of the molded recess 110. Therefore, the resin material 250 forced into the molding space from the through-hole introduction hole 182 is sufficiently flowed to the lower surface of the protruding piece 14, sufficiently surrounding the protruding piece 14, and forming the desired gripping body 68. molded. However, since the protruding piece 14 continues to be supported by the supporting protrusion 115,
As clearly shown in the figure, a blind hole 76 extending to the protruding piece 14 is formed on the lower surface side of the connecting base 72 of the molded grip 68. On the other hand, if the support protrusion 115 is not provided on the movable member 99 of the first mold section 94, the protrusion piece 14 is moved downward by the pressure applied to the protrusion piece 14 from the resin material 250 flowing into the molding space. The resin material 250 is forced to come into contact with or come close to the bottom surface of the first molding recess 110, and therefore the resin material 250 does not flow sufficiently toward the bottom surface of the protruding piece 14.
There is a considerable possibility that defective products may be produced in which there is too little synthetic resin covering the lower surface of the protruding piece 14 or in which the lower surface of the protruding piece 14 is partially exposed.

Continuing the explanation with reference to FIG. 17 as well as FIGS. 1, 8 and 9, when the mold 50 is moved from the compression molding area 58 to the discharge area 60, the main elevating member 13
0 and the sub-elevating member 132 (FIG. 7) are raised, and the second mold part 96 and the compression rod 216 are moved to the first mold part 94.
The mold 50 is opened (the container lid body 8 and the compression-molded grip 68 are separated upward from the first mold part 9).
4). Furthermore, in the first mold section 94, the movable member 99 is moved by the action of the cam mechanism 127.
is raised to the separated position shown by the two-dot chain line in FIG. 9 and shown by the solid line in FIG. Thus, the support surface 109 of the movable member 99 acts on the skirt wall 12 of the container lid body 8, and the support protrusion 115 also acts on the protruding piece 14 of the container lid body 8, raising the container lid body 8 somewhat. urge The gripping body 68 compression-molded by this rise also moves to the first mold part 9.
4 is raised from the first molding recess 110 and separated upwardly, and thus the container lid main body 8 and the molded grip 68 can be sufficiently easily discharged from the first mold part 94. Established.

As shown by the two-dot chain line in FIG. 17, the downstream end of the stationary guide 116 for preventing the container lid body 8 from falling off in the radial direction from the first mold part 94 is connected to the discharge area 6.
0, and there is no stationary guide 116 in the discharge area 60. On the other hand, emission area 60
A stationary evacuation member 252 is disposed at. The guide surface of this discharge member 252 is connected to the support member 9 of the first mold part 94.
The groove 102 formed in the movable member 99 extends gradually radially outward from the upstream end located within the recess between the lower receiving portion 107 and the upper restraining portion 89 in the movable member 99 . When the mold 50 passes through the discharge zone 60 , the container lid body 8 is gradually forced radially outward from the first mold section 94 by the action of the guide surface of the discharge member 252 , and thus the container lid body 8 A container lid 70 having a gripping piece 68 integrally connected to its protruding piece 14 is discharged onto an endless conveyor belt 62 (FIG. 1).

Although one embodiment of the compression molding apparatus constructed according to the present invention has been described above in detail, the present invention is not limited to this embodiment, and various modifications may be made without departing from the scope of the present invention. It goes without saying that it can be modified or modified.

[0032]

Effects of the Invention In the compression molding apparatus improved according to the present invention, the projecting piece of the container lid body projecting into the molding space can be moved by the supporting protrusion formed on the movable member of the first mold section. Supported. Therefore, the pressure applied to the protruding piece from the resin material flowing into the molding space from one side of the protruding piece reliably prevents the other side of the protruding piece from coming into contact with or approaching the bottom surface of the first molding recess; The protruding piece is maintained spaced apart from the bottom surface of the first molded recess. Therefore, the resin material sufficiently flows into the other side of the protruding piece, and a desired and good gripping body is compression-molded.

Furthermore, in the compression molding apparatus constructed according to the present invention, before the container lid is ejected from the first mold section, the movable member of the first mold section is moved to a position away from the molding position. By being moved, the container lid body is moved in a desired direction, and the compression-molded grip body is separated from the first molded recess. Therefore, the container lid having the container lid main body and the gripper integrally connected thereto can be discharged from the first mold section with sufficient ease and speed. Since the movable member acts on the container lid body rather than the compression-molded gripper, no undesirable deformation or the like is produced in the compression-molded gripper.

[Brief explanation of the drawing]

FIG. 1 is a simplified plan view of a compression molding system including one embodiment of a compression molding apparatus constructed in accordance with the present invention.

FIG. 2 is a perspective view showing a container lid body processed in the compression molding system of FIG. 1;

FIG. 3 is a cross-sectional view of the container lid body of FIG. 2;

FIG. 4 is a perspective view of a container lid having a grip that is compression molded and integrally connected to a protruding piece of the container lid body.

FIG. 5 is a cross-sectional view of the container lid of FIG. 4.

FIG. 6 is a sectional view showing rotary compression molding means of the compression molding apparatus in the compression molding system of FIG. 1;

FIG. 7 is a sectional view showing a mold and its related configuration in the compression molding means of FIG. 6;

8 is a perspective view showing a first mold portion of the mold in the compression molding means of FIG. 6; FIG.

FIG. 9 is a cross-sectional view of the first mold section of FIG. 8;

FIG. 10 is a perspective view showing a second mold portion of the mold in the compression molding means of FIG. 6;

FIG. 11 is a cross-sectional view taken along line A-A in FIG. 7;

FIG. 12 is a cross-sectional view taken along line BB in FIG. 7;

13 is a partial perspective view showing a resin material receiving area of the compression molding device in the compression molding system of FIG. 1. FIG.

14 is a partial sectional view showing a resin material receiving area of the compression molding device in the compression molding system of FIG. 1. FIG.

15 is a partial sectional view showing the state of the compression molding device at the upstream end of the compression molding zone in the compression molding system of FIG. 1. FIG.

16 is a partial sectional view showing the mold in the compression molding means of FIG. 6 in a state in which a resin material is compression molded into a desired gripping body.

17 is a partial perspective view showing the first mold section of FIG. 8 in a state in which the container lid is to be ejected; FIG.

[Explanation of symbols]

2: Perforation device 4: Rotary container lid body conveying device 6: Compression molding device 8: Container lid body 10: Top wall of the container lid body 12: Skirt wall of the container lid body 14: Connection protruding piece 40 of the container lid body : Rotary compression molding device 42 : Resin material supply device 44 : Discharge device 48 : Rotating support 50 : Molding die 68 : Grip 70 : Container lid (container lid main body and grip) 72 : Connection base of grip 74 : Ring part 93 of the gripper: Accommodation space 94: First mold part 95: Support member 96 of the first mold part: Second mold part 97: Mold member 99 of the first mold part: Movable member 109 of the first mold part: Support surface 110 of the movable member: First molding recess 115: Support protrusion 125 of the movable member: Elastic biasing means (movable member moving mechanism) 127: Cam mechanism (movable member moving mechanism) 131: Cam rod 135: Cam roller 137: Annular stationary cam member 139: Cam groove 180: Second molded recess 182: Penetration introduction hole 216: Compression rod 250: Synthetic resin material

Claims (4)

[Claims] 1. A mold comprising a first mold part and a second mold part that are relatively moved in a predetermined opening/closing direction to open and close, the first mold part has a housing space and a first molding recess, the second molding part has a second molding recess and a through-introduction hole extending in a predetermined direction from the second molding recess, and the through-introduction hole extends in a predetermined direction from the second molding recess. A compression rod is slidably inserted into the hole, and the first molding recess and the second molding recess cooperate to define a molding space for molding the synthetic resin grip. , the housing space of the first mold section has a circular top wall, a cylindrical skirt wall hanging from the periphery of the top wall, and a metal container lid main body having a connecting protrusion piece projecting from the lower end of the skirt wall. is accommodated, at least the free end of the connecting protruding piece of the container lid body is made to protrude into the molding space, a synthetic resin is supplied to the through-introduction hole of the second mold part, and the synthetic resin is The resin is compressed by the compression rod and compression-molded into a gripping body having a shape corresponding to the molding space, and the synthetic resin gripping body is compression-molded and at the same time is integrally connected to the connecting protrusion piece of the container lid main body. In the compression molding device, the first mold section includes a mold member in which the first molding recess is formed and a movable member mounted so as to be movable between a molding position and a remote position in the opening/closing direction. The movable member includes a support surface that supports at least a portion of the skirt wall of the container lid body, and a connecting protrusion of the container lid body that projects into the first molding recess even in the molding position. A support protrusion is formed to support the piece and separate it from the bottom surface of the first molding recess, and for selectively positioning the movable member of the first mold part in the molding position and the separated position. A movable member moving mechanism is provided, and while the movable member of the first mold section is positioned at the molding position, compression molding of the gripping body is performed, and the first molding Simultaneously with or following the relative opening movement of the mold part and the second mold part, the movable member is moved to the separated position, whereby the compression-molded grip body is removed from the first molding recess. A compression molding device characterized by being separated. 2. The movable member moving mechanism includes elastic biasing means for elastically biasing the movable member to the molding position, and forcing the movable member to the separated position against the elastic biasing action of the elastic biasing means. Claim 1, comprising a cam mechanism that causes
Compression molding equipment as described. 3. A rotary support body that is rotated in a predetermined direction, a plurality of molds are disposed on the rotary support body at intervals in the circumferential direction, and the cam mechanism is arranged on the rotary support body to rotate in a predetermined direction. 3. The compression molding apparatus of claim 2 including a stationary cam member extending along. 4. The gripping body has a connecting base surrounding at least a free end of the connecting protruding piece of the container lid body, and a ring portion extending in a ring shape from the connecting base. 3. The compression molding apparatus according to any one of items 3 to 3.