JPH072345B2 - Information recording disk injection molding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an information recording disk injection molding apparatus.

BACKGROUND ART Most transparent substrates of information recording disks such as optical disks are formed by injection molding equipment using PC (polycarbonate) or PMMA (polymethylmethacrylate) as a material.

9 and 10 show a conventional information recording disk injection molding apparatus.

As shown in FIG. 9, in such a conventional apparatus, a fixed mold body 1 having a molding surface and fixed on a base (not shown).
And a movable mold body 2 provided on the base such that the fixed mold body 1 and the mold molding surfaces face each other and are movable in a direction perpendicular to the mold molding surface. Although not shown, a hydraulic cylinder is provided as mold clamping means for moving the movable mold body 2 and clamping the fixed mold body 1 and the movable mold body 2 together.

The fixed mold body 1 includes a fixed mold plate 3, a disk-shaped fixed mirror plate 4 that forms one surface of a substrate to be molded, and a mounting mold plate 5 that attaches the fixed mirror plate 4 to the fixed mold plate 3. . A hollow cooling sleeve 6 is inserted so as to penetrate the center of the fixed mirror plate 4, and a cylindrical spool 7 is provided in the cooling sleeve. The spool 7 guides the molten material to be molded injected from the nozzle 8 of the injection means into the mold space 9 defined by the molding surface.

On the other hand, the movable mold body 2 includes a movable mold plate 10, a disk-shaped movable mirror plate 12 having the other surface of the substrate to be molded, that is, a surface carrying the stamper 11, and the movable mirror plate 12 on the movable mold plate 10. And a mounting template 13 for mounting. The stamper 11 is a thin plate-shaped and annular member for forming a signal recording pit,
In the portion corresponding to the inner peripheral portion and the outer peripheral portion of the movable mirror plate 12,
The inner peripheral portion and the outer peripheral portion of the stamper 11 are respectively attached to the movable mirror plate 12
A cylindrical inner peripheral clamp 14 and an annular outer peripheral clamp 15 which are pressed against and fixed to are respectively provided. Perimeter clamp
15 has a mold molding surface that defines the outer peripheral surface of the substrate to be molded, and is fastened to the movable mold plate 10 with bolts (not shown). Further, the inner peripheral clamp 14 has an annular protrusion 14a that protrudes into the mold space 9, and the stamper 11 is formed by the protrusion.
The inner peripheral portion of is pressed against the movable mirror plate 12. The inner peripheral clamp 14 is locked to the movable mold body 2 by a locking pin 16 at the clamp position.

Inside the cylindrical inner peripheral clamp 14, a tubular punch 17 is provided so as to be movable in the direction of arrow S, which is a direction perpendicular to the molding surfaces of the mold bodies 1 and 2. The tip portion of the punch 17 forms a part of the die forming surface, in this case, a portion corresponding to the center hole of the substrate formed by cooling and solidifying the material to be formed. The punch 17 is connected to the output shaft of the hydraulic cylinder and driven in the direction of arrow S, and cooperates with the die 18 provided on the fixed mold body 1 side to punch the center hole of the substrate. The cooling sleeve 6 and the spool 7 located inside the die 18 are retracted in accordance with this punching operation.

Inside the punch 17, an eject pin 20 is provided for reciprocating in the direction of arrow S to separate a portion corresponding to the substrate center hole punched by the punch 17 from the punch 17. The eject pin 20 is also driven by a hydraulic cylinder (not shown).

A cylindrical ejector 21 and a stationary sleeve 22 are provided between the inner peripheral clamp 14 and the punch 17, respectively. The ejector 21 is for ejecting the molded substrate to separate it from the movable mirror surface plate 12 and the stamper 11, is movable in the direction of arrow S, and is also driven by a hydraulic cylinder. The fixed sleeve 22 is fixed to the movable mold body 2 by a bolt or the like, and guides the movement of the ejector 21. An air blow groove 21a is formed on the outer peripheral surface of the ejector 21. Pressurized gas is supplied to the air blow groove 21a from a gas supply pump (not shown), and the pressurized gas is ejected from a minute gap between the ejector 21 and the fixed sleeve 22 when the molded substrate is released from the mold, The molded substrate is extruded and separated from the movable mirror plate 12 and the stamper 11.

Next, a locking means for locking the inner peripheral clamp of the stamper 11 against the movable mold body 2 when the inner peripheral clamp 14 for pressing the inner peripheral portion of the stamper 11 against the movable mirror surface plate 12 is in the clamp position will be described.

As shown in FIG. 10, a plurality of locking pins 16 for locking the inner peripheral clamp 14 at the clamp position are arranged in the movable mold plate 10 at equal pitches in the circumferential direction of the inner peripheral clamp 14.
Moreover, it is movable in the arrow R direction, which is the radial direction of the inner peripheral clamp 14. A disk-shaped rotating member 25 is rotatably provided around the inner peripheral clamp 14 on the side of each locking pin 16. The rotating member 25 has a spiral tooth portion on one main surface thereof, and the tooth portion formed on each locking pin 16 meshes with the spiral tooth portion. Radial teeth are formed on the other main surface of the rotary member 25 to form a so-called face gear, and the pinion 26 meshes with the radial teeth. The pinion 26 is fitted to one end of a rod member 27, the other end of the rod member projects outside the movable template 10, and a handle 28 is attached to the other end.

Next, the operation of the information recording disk injection molding apparatus having the above configuration will be described.

First, the movable mold body 2 is strongly pressed against the fixed mold body 1 to perform mold clamping to form a mold space 9. Then, the molten material to be molded is injected from the nozzle 8 and guided by the spool 7 into the mold space 9. The material to be molded which has reached the mold space 9 is cooled and solidified to mold the substrate. After this, as a punching step, the punch 17 is projected, and at the same time, the cooling sleeve 6 and the spool 7 are retracted together with the central portion of the substrate to be removed. This forms a central hole in the substrate.

Next, the fixed mold body 1 is formed together with the substrate on which the movable mold body 2 is molded.
At the same time, the eject pin 20 protrudes, and at the same time, the center portion of the substrate that has been punched out and attached to the tip of the punch 17 is separated from the punch 17. Then, as a mold releasing step, the pressurized gas is supplied to the air blow groove 21a, whereby the supply slightly floats from the molding surface of the movable mold body 2. After this, the ejector 21 projects and the supply is separated from the movable mold body 2 and collected.

Next, in the injection molding apparatus having the above-described configuration, the stamper 11
The work for replacing is explained.

First, the movable mold body 2 is largely separated from the fixed mold body 1. Then, the outer peripheral clamp 15 pressing and fixing the outer peripheral portion of the stamper 11 to the movable mirror surface plate 12 is removed from the movable mirror surface plate 12 by removing a fastening bolt (not shown). After this,
Rotate the rotating member 25 via the handle 28, and
The locked state of the inner clamp 14 by 16 is released. As a result, the clamping of the inner peripheral portion of the stamper by the protrusion 14a of the inner peripheral clamp 14 is released, and the stamper 11 can be removed. After that, a new stamper is attached by following the procedure reverse to the above.

In the above-mentioned conventional apparatus, the operator needs to manually rotate the handle 28 every time the stamper 11 is replaced, which gives the operator a feeling of trouble. Also,
A rotary member 25 having a complicated tooth portion can be manufactured or a rod 27 can be manufactured.
Since expensive processing such as forming a deep hole in the movable mold plate 10 to insert the through hole is required, the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is an information recording disk injection molding apparatus capable of easily and quickly exchanging a stamper and reducing cost. Is to provide.

The information recording disk injection molding apparatus according to the present invention is configured so that a cylindrical clamp member, which is retractable and rotatable with respect to the mold molding surface of the mold body and that fixes the inner peripheral portion of the stamper to the mold body, is at the clamp position. A locking means for locking is provided on the outer peripheral portion of the clamp member so as to extend substantially parallel to the retracting direction of the clamp member, and the guide groove is open at the end in the retracting direction, and the guide groove is provided on the outer peripheral portion. A locking groove provided in communication with each other and extending substantially parallel to the circumferential direction of the clamp member, and a movable groove provided between the locking position and the non-locking position in the protruding / retracting direction of the clamp member with respect to the mold body. A locking member having a locking projection that can be inserted into the guide groove and freely inserted into the locking groove, and positioning for positioning the locking member at either the locking position or the non-locking position It is characterized by comprising means and.

Embodiment An information recording disk injection molding apparatus as an embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the information recording disk injection molding apparatus includes a fixed mold body 41 fixed on a base (not shown), and a fixed mold body 41 and a mold molding surface on the base facing each other. In addition, the movable mold body 42 is provided so as to be movable in a direction perpendicular to the molding surface. Further, although not shown, a hydraulic cylinder is provided as a mold clamping means for moving the movable mold body 42 and strongly pressing the movable mold body 42 against the fixed mold body 41 to clamp the two mold bodies to each other. There is.

The fixed mold body 41 is connected to the fixed mold plate 44, a disk-shaped fixed back plate 47 fastened to the main surface of the fixed mold plate 44 by bolts 45 and 46, and the main surface of the fixed back plate 47 by bolts 48. A disk-shaped fixed mirror surface plate 49 forming one surface of the substrate to be molded, and an annular ring fixed to the fixed mold plate 44 with bolts 51 to prevent the fixed back plate 47 and the fixed mirror surface plate 49 from shifting in the radial direction. And a fixed mounting template 52.
A die 54 is provided at the center of the fixed mirror plate 49 so as to form a part of the molding surface. The die 54 cooperates with a punch described later to punch out the center hole of the substrate.
A counter punch 55, a cooling sleeve 56, and a spool 57 each formed in a cylindrical shape so as to be surrounded by the die 54.
Are concentrically provided. Further, a heater 59 is provided between the cooling sleeve 56 and the spool 57. In the spool 57, a material to be molded, such as PMMA (polymethylmethacrylate), in a molten state, which is injected from a nozzle 60 by an injection unit (not shown in the figure), is molded into a fixed mold body 41 and a movable mold body 42. Guide into the mold space 61 defined by the surface. Further, the heater 59 is for preventing solidification of the material to be molded in the spool 57. Further, the counter punch 55 gives a reverse pressing force to a punching force by the punch described later.

On the other hand, the movable mold body 42 includes three movable mold plates 63, 64 and 65 which are fastened to each other by bolts 62, and a disc-shaped movable mold which is fixed to the main surface of the innermost movable mold plate 63 by a bolt 66. A back plate 67, a disk-shaped movable mirror plate 69 connected to the main surface of the movable back plate 67 with bolts 68, and a movable back plate fixed to the movable template 63 with bolts 71.
67 and an annular movable mounting template 72 that prevents the movable mirror surface plate 69 from shifting in the radial direction.

A stamper 75 that forms the other surface of the substrate to be molded is provided on the main surface of the movable mirror plate 69. The stamper 75 is for forming signal recording pits, and is formed in a thin plate shape and in an annular shape.

In addition, a water channel is provided on each of the rear surfaces of the fixed mirror plate 49 and the movable mirror plate 69.
49a and 69a are formed, and cooling and solidification of the material to be molded is promoted by water that is circulated and supplied into the water channel by a water supply means (not shown).

The inner peripheral portion and the outer peripheral portion of the stamper 75 have a cylindrical inner peripheral clamp 77 and an annular shape that press and fix the inner peripheral portion and the outer peripheral portion of the stamper 75 toward the movable mirror surface plate 69, respectively. Outer peripheral clamps 78 are provided respectively. The inner peripheral clamp 77 is provided so as to be retractable from the mold forming surface of the stamper 75 on the movable mirror surface plate 69, and has an annular protrusion 77a protruding into the mold space 61 as shown in FIG. The inner peripheral portion of the stamper 75 is pressed against the movable mirror surface plate 69 by the protrusion.

As is apparent from FIG. 3, an L-shaped groove 77e as a whole is formed on the outer periphery of the rear end portion of the inner peripheral clamp 77 formed in a cylindrical shape. The groove 77e extends in a direction parallel to the central axis of the inner peripheral clamp 77, that is, in the protruding / retracting direction of the inner peripheral clamp 77, and one end of which extends toward the rear of the inner peripheral clamp 77. The circumferential clamp 77 includes a locking groove 77g having a rectangular cross section, which extends in the circumferential direction and communicates with the other end of the guide groove 77f at one end thereof.

On the other hand, a locking member 80 is provided in the movable mold plate 63,
The locking projection having a rectangular cross section, that is, the locking projection 80e of the locking member 80 can be engaged with the groove 77e.
The locking protrusion 80e is smoothly inserted into the guide groove 77f, and is loosely inserted into the locking groove 77g with a relatively large gap. The locking member 80 is provided in the groove 77e of the inner peripheral clamp 77.
Engaging with the inner wall surface of the locking groove 77g of the locking projection 80e,
The inner peripheral clamp 77 is locked at a clamp position, that is, a position where the stamper 75 is pressed toward the movable mirror surface plate 69. In addition,
The inner clamp 77 is rotatable.

The locking member 80 is movable in the protruding / retracting direction of the inner peripheral clamp 77 (direction of arrow S). The locking member 80 is at the position shown by the solid line in FIG.
2 is moved between a locking position for locking and a position shown by a chain double-dashed line in FIG. 2, that is, a non-locking position for releasing the locked state of the inner peripheral clamp 77. At this time, the locking projection 80
e moves within the locking groove 77g.

A chamber 63a formed in the movable template 63 is provided with an inner clamp 7
A piston rod 81 is provided so as to be movable in the protruding and retracting direction of 7 (direction of arrow S), and the tip of the piston rod 81 is in contact with the rear end of the forming member 80. Chamber 63a
Pressurized gas is supplied to the inside by pressurized gas supply means (not shown), which drives the piston rod 81 in the protruding direction and moves the forming member 80 to the unlocked position.

On the other hand, inside the movable back plate 67, a coil spring 83 for urging the locking member 80 toward the locking position is provided.

The pneumatic cylinder including the piston rod 81 and the chamber 63a, the pressurized gas supply unit, and the coil spring 83 serve as a positioning unit that positions the locking member 80 at either the locking position or the non-locking position. It is configured. Further, the positioning means and the locking member 80 constitute locking means for locking the inner peripheral clamp 77 when it is in the clamp position.

On the other hand, on the outer peripheral surface of the annular pressing member, that is, the outer peripheral clamp 8, which presses and fixes the outer peripheral portion of the stamper 75 to the movable mirror surface plate 69, an annular groove 78a is formed over the entire circumference thereof. As shown in FIG. 4, an annular clamp ring 85 as a locked member is provided so as to be fitted onto the outer peripheral clamp 78. The clamp ring 85 is arranged so as to be sandwiched by the fixed mounting die plate 52 and the movable mounting die plate 72 which are the respective constituent members of the fixed die body 41 and the movable die body 42. A plurality of sliding pins 86 are fixedly mounted on the clamp ring 85 at equal intervals in the circumferential direction, and the tip ends of the sliding pins 86 are slidably engaged with an annular groove 78 a formed in the outer peripheral clamp 78. I am fit. That is, the clamp ring 85 is slidable with respect to the outer peripheral clamp 78 in the planes parallel to the molding surfaces of the fixed mold body 41 and the movable mold body 42.

As shown in FIG. 1, the chambers 52a and 7 are provided in the fixed mounting template 52 and the movable mounting template 72 sandwiching the clamp ring 85.
2a is formed. A plurality of chambers 52a and 72a are provided at equal intervals along the circumferential direction of the fixed mounting die plate 52 and the movable mounting die plate 72, respectively, so as to be alternately arranged.
Each chamber 52a and 72a has a fixed mold body 41 and a movable mold body 42.
Locking members, that is, piston rods 89 and 90 are provided so as to be movable in the direction of the arrow S orthogonal to the respective molding surfaces and projectable from the molding surfaces. The locked member or clamp ring 85 is
Fixed mold body 41 and movable mold body by engaging 89 and 90
It is locked to 42. Pressurized gas is supplied into the chambers 52a and 72a by a pressurized gas supply means (not shown), whereby the piston rods 89 and 90 are driven toward the protruding direction, that is, toward the unlocked position. In addition, coil springs 92 and 93 are provided in the chambers 52a and 72a for applying a biasing force to the piston rods 89 and 90 in the storage direction, that is, toward the locking position.

As shown in FIG. 4, the piston rods 89 and 90 described above are used.
The circular large diameter portions 89a and 90a are provided in the. The clamp ring 85 as a locked member has the large diameter portions 9a and 90.
A plurality of circular through holes 85a and 85b into which a can be inserted are formed. Further, the clamp ring 85 is formed with a long hole 85c communicating at one end with a through hole 85a into which the large diameter portion 89a of one piston rod 89 can be fitted. This long hole 85c is
It extends in the moving direction of the clamp ring 85 with respect to the outer peripheral clamp 78 (direction of arrow Q), and
It has a width diameter smaller than that of the large diameter portion 89a of 89, and the portion other than the large diameter portion of the piston rod 89 can be inserted therethrough. In addition, a long hole 85d communicating at one end with a through hole 85b into which the large diameter portion 90a of the other piston rod 90 can be fitted is formed. The long hole 85d is disposed so as to be sandwiched between the through hole 85b which communicates with itself and the above-mentioned other long hole 85c, extends in parallel with the other long hole 85c (direction of arrow Q), and has a piston shape. The rod 90 has a width diameter smaller than that of the large-diameter portion 90a, and a portion other than the large-diameter portion of the piston rod 90 can be inserted therethrough. As shown in FIG.
The large diameter portion 89a of one piston rod 89 is clamp ring 8
When the piston rod 90 can be inserted into and removed from the through hole 85a of 5, the other piston rod 90 has a portion other than the large diameter portion 90a inserted into the tip of the elongated hole 85d. That is, the clamp ring 85, which is the locked member, together with the held outer peripheral clamp 78, is formed by the large diameter portion 90a of the piston rod 90 so that one mold body, in this case,
The movable mold 42 is locked. This makes the stamper
The outer peripheral portion of 75 is fixed to the movable mold body 42. The position of the clamp ring 85 at this time is referred to as a first position. The second position is the position where the clamp ring 85 is rotated from the first position by a predetermined angle with respect to the outer peripheral clamp 78 so that the large diameter portion 90a of the piston rod 90 can be inserted into and removed from the through hole 85b of the clamp ring 85. Called. Clamp ring 85
When the piston rod 89 is in the second position, contrary to the above, the piston rod 89 has the portion other than the large diameter portion 89a inserted into the tip portion of the elongated hole 85c. Therefore, the clamp ring 85 is locked to the fixed mold body 41 by the large diameter portion 89a of the piston rod 89 together with the outer peripheral clamp 78 and released from the locked state to the movable mold body 42, whereby the stamper 75 by the outer peripheral clamp 78 is released. The pressed state of is released.

As shown in FIG. 4, a handle 95 is projectingly provided on the outer circumference of the clamp ring 85, and the clamp ring 85 is provided with the handle 95.
Is operated to move the outer peripheral clamp 78 between the first position and the second position.

As shown in FIG. 1, a guide pin 96 is screwed into the clamp ring 85 at its threaded portion, and is guided in a guide hole formed in the movable back plate 67 and the movable mirror plate 69. The pin 96 can fit smoothly.

Further, as described above, the fixing of the clamp ring 85 to the fixed mold body 41 and the movable mold body 42 and the transition of the clamp ring 85 between the mold bodies are made by the pneumatic cylinder including the piston rods 89 and 90. As a result, the cost can be easily reduced in the information recording disk injection molding apparatus including many air voltage cylinders for moving other movable members.

As shown in FIG. 1 and FIG. 2, in the inner peripheral clamp 77 formed in a cylindrical shape, an arrow that is a direction perpendicular to each molding surface of the fixed mold body 41 and the movable mold body 42 is shown. A tubular punch 97 is provided so as to be movable in the S direction. Punch 97
Forms a part of the molding surface, in this case, a portion corresponding to the center hole of the substrate formed by cooling and solidifying the material to be molded. The punch 97 is driven in the direction of arrow S by a hydraulic cylinder (not shown), and the fixed mold body 41
The center hole of the substrate is punched in cooperation with a die 54 provided on the side. The counter punch 55, the cooling sleeve 56, and the spool 57 located inside the die 54 are retracted in the protruding direction of the punch 97 in accordance with this punching operation.

In the inside of the punch 97, an eject pin 98 for reciprocating in the direction of arrow S is provided for removing a portion corresponding to the substrate center hole which is punched by the punch 97 and attached to the tip of the punch from the punch 97. There is. The eject pin 98 is also driven by a hydraulic cylinder (not shown).

A cylindrical ejector 100 and a stationary sleeve 101 are concentrically arranged between the inner peripheral clamp 77 and the punch 97. The retractable member or ejector 100 is
The molded substrate is pushed out and separated from the stamper 75, is movable in the direction of arrow S, and is also driven by a hydraulic cylinder (not shown).

The fixed sleeve 101 is fixed to the movable mold body 42 by bolts or the like, and is fitted onto the ejector 100 to guide the movement of the ejector. An air blow groove 101a is fixed to the outer peripheral surface of the fixed sleeve 101. Air blow groove 101a
Is supplied with pressurized air from a gas supply pump (not shown),
The pressurized air is clamped on the inner circumference when the molded substrate is released from the mold.
The substrate, which has been ejected from the minute gap 102 between the 77 and the fixed sleeve 101, is extruded and separated from the stamper 75.

As is particularly clear from FIG. 2, between the ejector 100 as a retractable member provided to project and retract from the mold molding surface of the movable mold body 42 and the fixed sleeve 101 forming a part of the mold body,
A minute gap 103 is provided in the vicinity of the molding surface. By providing the minute gap 103, the molten molding material is prevented from entering between the ejector 100 and the fixed sleeve 101, and the occurrence of burrs is reduced. Further, a plurality of, for example, spherical rolling bearing members 105 made of, for example, steel or resin are provided between the ejector 100 and the fixed sleeve 101 on the side opposite to the molding surface with respect to the minute gap 103 in the moving direction of the ejector 100. Are installed at regular intervals along. Further, a retainer 106 made of a cylindrical resin or the like that holds the rolling bearing members so that the distance between the rolling bearing members 105 does not change.
Is provided. Thus, the rolling bearing member 105 is interposed between the ejector 100 that moves in and out of the mold forming surface of the movable mold body 42 and the fixed sleeve 101 that guides the movement of the ejector 100. It is prevented that abrasion powder is generated between the fixing sleeve 101 and the fixing sleeve 101. The rolling bearing member 105 may be provided between the punch 97 and the ejector 100.

As is clear from the above description, the minute gap 102 that ejects the pressurized air to separate the molded substrate from the stamper 75 is provided outside the ejector 100 that appears and disappears. Therefore, the ejected pressurized air is ejected by the ejector 100.
It is not supplied toward the center hole of the substrate formed by being blocked by, but is supplied toward the outer peripheral portion of the substrate. This effectively releases the substrate.

Next, the operation of the information recording disk injection molding apparatus having the above configuration will be described.

First, the movable mold body 42 is brought close to the fixed mold body 41 by the mold clamping means, and is pressed by a strong hydraulic pressure to perform mold clamping. As a result, the mold space 61 is formed. Then, the molten material to be molded is injected through the nozzle 60, is guided into the mold space 61 via the spool 57, and the mold material is filled into the mold space with a predetermined pressure. The material to be molded in a molten state is cooled and solidified in the mold space 61 to form a substrate. Information recording pits are formed by the stamper 75 on this substrate. After that, in the punching step, the punch 97 is made to project into the mold space 61, and at the same time, the counter punch 55, the cooling sleeve 56 and the spool 57 are retracted while being pressed by the punch 97, thereby forming a central hole in the substrate. To be done.

After that, the mold clamping means separates the movable mold body 42 from the fixed mold body 41 with the molded substrate attached. At the same time, the eject pin 98 protrudes and punches 97 from the substrate body.
The central portion of the substrate that has been punched out and attached to the tip of the punch is separated from the punch. Then, as a mold releasing step, pressurized air is supplied to the air blow groove 101a formed on the outer peripheral surface of the fixed sleeve 101, and the minute gap 102 is formed.
This pressurized air jetted through the substrate moves the movable mold 42.
Slightly lifted from the upper stamper 75. After this, the ejector 100 is projected and the substrate is separated from the stamper 75 and the movable mold body 42 and collected.

Next, the operation of exchanging the stamper 75 in the information recording disk injection molding apparatus having the above-described configuration will be described with reference to FIGS. 5 to 8. The stamper 75 is fixed to the movable mold 42 during the injection molding operation.

First, the movable mold body 42 is brought close to the fixed mold body 41 by the mold clamping means to perform mold clamping. Then, by operating a predetermined switch, each chamber 52 in the fixed mounting mold plate 52 and the movable mounting mold plate 72 is operated.
Pressurized gas is supplied into a and 72a. As a result, the piston rods 89 and 90 are projected as shown in FIG. 5, and the clamp ring 85 and the outer periphery which are locked to the movable mold body 42 by the large diameter portion 90a of the piston rod 90 by the urging force of the coil spring 93. The locked state of the clamp 78 is released. Therefore, since the clamp ring 85 is rotatable with respect to the outer peripheral clamp 78, the handle 95 of the clamp ring 85 is operated to rotate the clamp ring 85 and bring the clamp ring 85 from the first position to the second position described above. You Thus, the large-diameter portion 90a of the piston rod 90 has the through hole 8 of the clamp ring 85.
The piston rod 89 can be inserted into and removed from the piston rod 5b, and the portion of the piston rod 89 other than the large diameter portion 89a is inserted into the tip of the elongated hole 85c of the clamp ring 85. Then, the switch is operated to cut off the supply of the pressurized gas into the chambers 52a and 72a. Therefore, as shown in FIG. 6, each piston rod 89 and
90 is moved in the storage direction by the coil spring 92 and the urging force, and the clamp ring 85 is fixed to the fixed mold body 41 by the large diameter portion 89a of the piston rod 89 together with the outer peripheral clamp 78 and locked to the movable mold body 42. The state is released, whereby the pressed state of the outer peripheral portion of the stamper 75 by the outer peripheral clamp 78 is released.

On the other hand, as shown in FIG. 3, the locking projection 80e of the locking member 80
Engages with the locking groove 77g of the groove 77e of the inner peripheral clamp 77,
As a result, the inner peripheral clamp 77 is locked at the clamp position, that is, at the position where the stamper 75 is pressed against the movable mirror surface plate 69.

However, the locking projection 80e is loosely inserted in the locking groove 77g, and is strongly pressed against the rear side surface of the locking groove 77g by the urging force of the coil spring 83. In this state, a switch or the like is operated to supply the pressurized gas into the chamber 63a in the movable mold plate 63 to cause the piston rod 81 to project. Then, the locking member 80 is moved to the locking release position shown by the chain double-dashed line in FIG. 2 against the biasing force of the coil spring 83. As a result, the inner clamp 77 is released from the locked state. From this state, move the inner clamp 77 to the arrow M
Rotate in the direction. Then, the locking protrusion 80e of the locking member 80
Is the bent portion of the L-shaped groove 77e, that is, the guide groove 77f and the locking groove.
Located at the junction with 77g. As shown in FIG. 7, in this state, the inner peripheral clamp 77 is pulled out forward (direction of arrow T). Then, the locking projection 80e of the locking member 80 separates from the inner peripheral clamp 77 via the guide groove 77f. As a result, the pressed state of the inner peripheral portion of the stamper 75 by the inner peripheral clamp 77 is released. Thus, the stamper 75 is released from both the pressed state of the inner peripheral portion and the outer peripheral portion thereof, and the movable mold body 42 is released as shown in FIG.
The stamper 75 can be detached from the movable mirror surface plate 69 and collected by separating the stamper 75 from the fixed mold body 41. After this,
The process opposite to the above is followed to install a new stamper, and the stamper replacement work is completed. As shown in FIGS. 3 and 7, the inner clamp 77 has a groove.
In order to smoothly fit the locking projection 80e of the locking member 80 into the guide groove 77f of the 77e, a guide slope 77h for guiding the locking projection 80e is formed at the open end of the guide groove 77f. In addition, a guide slope 77i is provided at the joint between the guide groove 77f and the locking groove 77g to facilitate the transition of the locking projection 80e between the two grooves.

As described above, in the above-described embodiment, the chamber 63
If pressurized gas is supplied into a, the locking member 80 will
7 and the clamped state of the inner peripheral portion of the stamper 75 by the inner peripheral clamp 77 is released. Conversely, chamber 63
By cutting off the supply of pressurized gas into a, the inner peripheral clamp 7
7 clamps the inner periphery of stamper 75.

As described above, the clamping and unclamping of the inner peripheral portion of the stamper 75 are performed only by supplying and stopping the supply of the pressurized gas to the chamber 63a by operating the switch, for example, and it is extremely easy to replace the stamper 75. Can be done quickly.

EFFECTS OF THE INVENTION As described in detail above, in the information recording disk injection molding apparatus according to the present invention, there is provided a clamp member that can be retracted and rotated with respect to the molding surface of the mold body and that can fix the inner peripheral portion of the stamper to the mold body. A locking means for locking the clamp member at the clamp position is provided on the outer peripheral portion of the clamp member so as to extend substantially parallel to the retracting direction of the clamp member, and the guide groove is open at the end in the retracting direction. A locking groove provided on the outer peripheral portion so as to communicate with the guide groove and extending substantially parallel to the circumferential direction of the clamp member, and a locking position and a non-locking position with respect to the die pair in the retracting direction of the clamp member. A locking member having a locking protrusion that is movably provided between the locking groove and can be inserted into the guide groove and loosely inserted in the locking groove; And positioning means for positioning in any of It

With such a structure, the stamper can be clamped and released by simply operating the switch that drives the locking member, and the stamper can be replaced very easily and quickly. Also, if the switch is made to interlock with the main switch that controls the operation and stop of the operation of the entire injection molding apparatus, or if the main switch itself is a switch for controlling the clamp operation, the main switch is turned off before the stamper is replaced. It is not necessary to turn off the clamp operation control switch, which saves time and labor, and the main switch is always turned off when the stamper is replaced, which is preferable from the viewpoint of safety.

Further, with such a configuration, it is difficult to form an expensive rotating member having a complicated tooth portion as provided in a conventional device or a deep insertion hole for inserting a long rod to which a handle is connected. No processing is required, and cost reduction is achieved.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross section of an information recording disk injection molding apparatus as an embodiment of the present invention, and FIG. 2 is an enlarged cross sectional view of a main part of the information recording disk injection molding apparatus shown in FIG. 3 and 4 are perspective views of the essential parts of the information recording disk injection molding apparatus shown in FIG. 1, and FIGS. 5 to 8 are information recording disk injection molding shown in FIGS. 1 to 4. FIG. 9 is a side view including a partial cross section of a conventional information recording disk injection molding device, and FIG. 10 is an enlarged cross-sectional view of a main part of the conventional device shown in FIG. Explanation of symbols for main parts 41 …… Fixed mold, 42 …… Movable mold 44 …… Fixed mold plate 47 …… Fixed back plate 49 …… Fixed mirror plate, 54 …… Die 55 …… Counter punch 56 …… Cooling sleeve 57 …… Spool 63,64,65 …… Moveable template 69 …… Movable mirror plate 75 …… Stamper, 77 …… Inner peripheral clamp 77f …… Guide groove, 77g …… Locking groove 78 …… Outer peripheral clamp 80 …… Locking member, 80e …… Locking projection 81,89,90 …… Piston rod 82 …… Piece member 83 …… Coil spring 85 …… Clamp ring 97 …… Punch 98 …… Eject pin 100 …… Ejector 101 ...... Fixed sleeve

Claims (2)

[Claims] 1. A mold forming surface is formed, and said mold forming surfaces are arranged so as to face each other, move relative to each other in a direction substantially perpendicular to said mold forming surface, and form a mold space by said mold forming surface. Provided on one of the pair of mold bodies, a mold clamping means for clamping the mold body, an injection means for injecting a molten material to be molded into the mold space after the mold is clamped. And a stamper forming a part of the die molding surface, and provided on the one die body so as to be retractable and rotatable with respect to the die molding surface and to fix the inner peripheral portion of the stamper to the one die body. An information recording disk injection molding apparatus comprising: a cylindrical clamp member for clamping; and a locking means for locking the clamp member when the clamp member is in a clamp position, wherein the locking means is provided on an outer peripheral portion of the clamp member. Substantially flat in the direction in which the clamp members A guide groove extended to and opened at an end in the retraction direction, and a locking groove provided in communication with the guide groove on the outer peripheral portion and extending substantially parallel to the circumferential direction of the clamp member, A locking protrusion that is movably provided between the locking position and the non-locking position in the projecting / retracting direction with respect to the mold body and that can be inserted into the guide groove and loosely inserted into the locking groove. An information recording disk injection molding apparatus comprising a stop member and a positioning means for positioning the locking member at either the locking position or the non-locking position. 2. The positioning means is movably provided in a chamber formed in the mold body in a direction substantially parallel to the protruding / retracting direction, and the locking member is positioned at either the locking position or the non-locking position. A piston rod that moves toward one side, a pressurized gas supply means that supplies a pressurized gas into the chamber to drive the piston rod, and a biasing force for the locking member toward the other side. The information recording disk injection molding apparatus according to claim 1, further comprising a biasing means.