JPH0688294B2 - 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.

11 and 12 show a conventional information recording disk injection molding apparatus.

As shown in FIG. 11, in such a conventional device, a fixed mold body 1 having a mold 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 11 having the other surface of the substrate to be molded, that is, a surface carrying the stamper 11, and the movable mirror plate 11 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. 12, 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 the 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 center portion of the substrate to be punched. 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 releasing step, a pressurized gas is supplied to the air blow groove 21a, so that the substrate is slightly lifted from the molding surface of the movable mold 2. After that, the ejector 21 projects and the substrate 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 of the present invention is to enable easy and quick replacement of a stamper and to achieve cost reduction of an information recording disk injection molding. It is to provide a device.

The information recording disk injection molding apparatus according to the present invention is a locking means that locks a clamp member that is capable of protruding and retracting with respect to the molding surface of a mold body and that fixes the inner peripheral portion of the stamper to the mold body at the clamp position. Is a pair of movably provided between a locking position and a locking release position for locking the clamp member in a direction substantially perpendicular to the protruding / retracting direction of the clamp member and inclined with respect to the moving direction. A locking member having an inclined surface, a piston rod movably provided in a chamber formed in the mold body in a direction substantially parallel to the protruding / retracting direction of the clamp member, and capable of slidingly contacting the one inclined surface at the tip end portion; Pressurized gas supply means for supplying a pressurized gas into the chamber to drive the piston rod, a piece member slidably contacting the other slope, and the piece member in the projecting and retracting direction toward the other slope. Almost parallel Consists of a biasing means for biasing the direction, is characterized in that the clamping state of the stamper in the peripheral portion by the clamp member is released by the following Te cut off the supply of pressurized gas into the said chamber.

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. 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 forming 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 described above, the inner peripheral clamp 77 is formed in a cylindrical shape, and the locking groove 77b is formed on the outer periphery thereof. Movable template 6
A locking member 80 that fits in the locking groove 77b at one end 80a and locks the inner peripheral clamp 77 at a clamp position, that is, a position where the stamper 75 is pressed, is provided in the inside 3 of the inner peripheral clamp 77. Direction perpendicular to (direction of arrow S) (direction of arrow R)
It is movably provided in. The locking member 80 is at the position shown by the solid line in FIG.
A locking position where the inner peripheral clamp is engaged with and locked to the inner peripheral clamp 77 and a releasing position where the inner peripheral clamp is released from the inner peripheral clamp 77. Move between. The locking member 80 has its moving direction (arrow R
A pair of parallel inclined surfaces 80b and 80c inclined with respect to the (direction) are formed so as to be located on opposite sides. A chamber 63a is formed in the movable mold plate 63 behind the locking member 80, and a piston rod is movably provided in the chamber 63a in the direction in which the inner peripheral clamp 77 appears and disappears (direction of arrow S).
81 is provided. The tip end portion of the piston rod 81 can slidably contact one slope 80b of the locking member 80. Pressurized gas is supplied into the chamber 63a by unillustrated pressurized gas supply means, and the piston rod 81 is driven in the protruding direction by this. A piece member 82 is in sliding contact with the other slope 80c of the locking member 80. In the movable back plate 67, the piece member 82 faces the other slope 80c of the locking member 80 and the inner peripheral clamp 7
A coil spring 83 is provided that biases the 7 in the protruding / retracting direction (arrow S direction).

The locking member 80, the pneumatic cylinder including the piston rod 81, the piece member 82, and the coil spring 83 constitute a locking means for locking the inner peripheral clamp 77 when it is in the clamp position. There is.

On the other hand, on the outer peripheral surface of an annular pressing member, that is, the outer peripheral clamp 78 that 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. As also shown in FIG. 3, 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. 3, 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 89a and 9a.
A plurality of circular through holes 85a and 85b into which 0a 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,
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. 3, a handle 95 is projectingly provided on the outer periphery of the clamp ring 85, and the clamp ring 85 has 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. This makes it easy to reduce the cost in the information recording disk injection molding apparatus including many pneumatic 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 formed on 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 such a 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, with respect to the minute gap 103, a plurality of, for example, spherical rolling bearing members 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.
105 are inserted at equal intervals along the moving direction of the ejector 100. In addition, each of these rolling bearing members
A retainer 106 made of a cylindrical resin or the like for holding the rolling bearing members is provided so that the distance between the 105 does not change. 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, as a 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, whereby a central hole is formed in the substrate. It

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. 4 to 6. 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. 4, 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. 5, each piston rod 89 and
90 is moved in the storing direction by the urging force of the coil springs 92 and 93, and the clamp ring 85 is the outer peripheral clamp 78.
Together with the large diameter portion 89a of the piston rod 89, the fixed mold body 41
And is released from the locked state with respect to the movable mold body 42, 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, by operating the other switches, the chamber inside the movable template 63
The supply of pressurized gas into 63a is cut off. As a result, the piece member 8
The locking member 80 is moved from the locking position shown by the solid line in FIG. 2 to the locking release position shown by the chain double-dashed line in FIG. 2 by the urging force applied by the coil spring 83 via 2.
Remove from inner clamp 77. 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, and if the movable mold body 42 is separated from the fixed mold body 41 as shown in FIG. 6, the stamper 75 is removed from the movable mirror surface plate 69 and recovered. You can do it. After this, a process completely opposite to the above is followed to attach a new stamper, and the stamper replacement work is completed.

As described above, in the embodiment shown in FIGS. 1 to 6, by interrupting the supply of the pressurized gas into the chamber 63a, the biasing force applied by the coil spring 83 via the bridge member 82 is used. Locking member 80 is inner clamp 77
The inner peripheral clamp 77 releases the clamped state of the inner peripheral portion of the stamper 75. On the contrary, when pressurized gas is supplied into the chamber 63, the inner peripheral clamp 77 clamps the inner peripheral portion of the 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.

As an information recording disk injection molding apparatus having another structure capable of rapidly exchanging the stamper 75, one shown in FIGS. 7 to 10 can be considered.

The information recording disk injection molding apparatus shown in FIGS. 7 to 10 is constructed in exactly the same manner as the information recording disk injection molding apparatus shown in FIGS. 1 to 6 except for the portions described below. , Will not be detailed. Further, in the following description, the same reference numerals are used for the same or corresponding portions as those of the information recording disk injection molding apparatus shown in FIGS. 1 to 6.

As shown in FIGS. 7 to 10, in the information recording disk injection molding apparatus, a generally L-shaped locking groove 77e is formed on the outer periphery of the rear end portion of the cylindrical inner peripheral clamp 77. ing. As is clear from FIGS. 9 and 10,
The locking groove 77e extends in parallel to the central axis of the inner peripheral clamp 77, and one end of the first groove 77f has a rectangular cross section open toward the rear of the inner peripheral clamp 77 and the inner peripheral clamp 77 in the circumferential direction. And a second groove 77g having a rectangular cross section and extending at one end thereof to communicate with the other end of the first groove 77f.

On the other hand, a locking member 80 is provided in the movable mold plate 63,
The locking projection 80e having a rectangular cross section of the locking member 80 can be engaged with the locking groove 77e. The locking member 80 engages with the second groove 77g of the locking groove 77e of the inner peripheral clamp 77 by the locking projection 80e thereof, so that the inner peripheral clamp 77 is clamped, that is, the stamper 75 is fixed to the movable mirror surface plate 69. Lock at the position where it is pressed toward. 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.
Moves between a locking position for locking and the position shown by a chain double-dashed line in FIG. 8, that is, a locking release position for unlocking the locked state of the inner peripheral clamp 77.

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 (direction of arrow S) of 7, and the tip of this piston rod 81 is in contact with the rear end of the locking member 80. Chamber 63a
Pressurized gas is supplied to the inside by pressurized gas supply means (not shown), whereby the piston rod 81 is driven in the protruding direction, and the locking member 80 is moved to the locking release 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 above-mentioned locking member 80, the pneumatic cylinder including the piston rod 81, and the coil spring 83 constitute a locking means for locking the inner peripheral clamp 77 when it is in the clamp position.

Next, an operation for replacing the stamper 75 in the information recording disk injection molding apparatus shown in FIGS. 7 to 10 will be described. Since the operation of the information recording disk injection molding apparatus at the time of disk substrate injection molding is the same as the operation of the information recording disk injection molding apparatus shown in FIGS. 1 to 6, its description is omitted. The pressing and releasing of the outer peripheral portion of the stamper 75 by the outer peripheral clamp 78 are performed in the same manner as in the information recording disk injection molding apparatus shown in FIGS. 1 to 6, and therefore the description thereof is omitted.

As shown in FIG. 10, the locking projection 80e of the locking member 80 is engaged with the second groove 77g of the locking groove 77e of the inner peripheral clamp 77, whereby the inner peripheral clamp 77 moves to the clamp position, It is locked at a position where the stamper 75 is pressed against the movable mirror surface plate 69.

However, the locking projection 80e is loosely fitted in the second groove 77g, and is strongly pressed against the rear surface of the second groove 77g by the biasing 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 resists the urging force of the coil spring 83 and moves to the eighth position.
It is moved to the unlocked position shown by the chain double-dashed line in the figure. As a result, the inner clamp 77 is released from the locked state. From this state, the inner peripheral clamp 77 is rotated in the arrow S direction. Then, the locking projection 80e of the locking member 80 is bent at the bent portion of the L-shaped locking groove 77e, that is, the first groove 77f and the second groove 77g.
It is located at the engaging part with. As shown in FIG. 9, 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 is disengaged from the inner peripheral clamp 77 via the first 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 can be removed from the movable mirror surface plate 69 and recovered. After this, a process completely opposite to the above is followed to attach a new stamper, and the stamper replacement work is completed. As shown in FIG. 9 and FIG. 10, the inner peripheral clamp 77 has a first engaging groove 77e with a locking groove 77e.
In order to smoothly fit the locking projection 80e of the locking member 80 into the groove 77f, a guide slope 77h for guiding the locking projection 80e is formed at the open end of the first groove 77f. Also, the first groove 7
The joint between the 7f and the second groove 77g is also provided with a guide slope 77i for facilitating the transition of the locking projection 80e between the both grooves.

Effects of the Invention As described in detail above, in the information recording disk injection molding apparatus according to the present invention, the clamp member, which is capable of protruding and retracting with respect to the molding surface of the mold body and fixing the inner peripheral portion of the stamper to the mold body, is at the clamp position. The locking means that locks this at a certain time,
A pair of slopes is provided movably between a locking position and a locking release position for locking the clamp member in a direction substantially perpendicular to the retracting direction of the clamp member and inclined with respect to the moving direction. An engaging member, a piston rod movably provided in the chamber formed in the mold body in a direction substantially parallel to the protruding and retracting direction of the clamp member, and capable of slidingly contacting the one inclined surface at the tip end; A pressurized gas supply means for supplying a pressurized gas to drive the piston rod, a piece member slidingly contacting the other slope, and a substantially parallel to the projecting / retracting direction with the piece member facing the other slope. Urging means for urging in different directions.

That is, by stopping the supply of the pressurized gas into the chamber, the locking member is separated from the clamp member by the urging force applied by the urging means via the piece member, and the inner peripheral portion of the stamper by the clamp member is released. The clamp state is released, and conversely, when the pressurized gas is supplied into the chamber, the clamp member clamps the inner peripheral portion of the stamper.

With such a structure, the stamper is clamped and released by simply operating the switch for controlling the supply and stop of the supply of the pressurized gas, 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 machine, or if the main switch itself is used as a switch for controlling the clamp operation, the clamp is switched before the main switch is turned off when the stamper is replaced. It is not necessary to turn off the 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, since the stamper clamping operation is controlled by using the pressure of the pressurized gas in this way, an expensive rotating member having a complicated tooth portion, which is provided in the conventional apparatus, or a large-scale member to which a handle is connected is used. Therefore, it is possible to reduce the cost by eliminating the difficult process of forming a deep insertion hole for inserting a large rod.

[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 FIGS. 2 and 3 are main parts of the information recording disk injection molding apparatus shown in FIG. Enlarged sectional views and perspective views, respectively, and FIGS.
FIG. 7 is an operation explanatory view of the information recording disk injection molding apparatus shown in FIG. 3 and FIG. 7 is another information recording disk having the same effect as the information recording disk injection molding apparatus shown in FIG. 1 to FIG. 8 to 10 are enlarged views of a part of the information recording disk injection molding apparatus shown in FIG. 7, and FIG. 11 is a conventional information recording disk injection molding. A side view, including a partial cross section of the device,
FIG. 12 is an enlarged cross-sectional view of the 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 …… Movable template 69 …… Movable mirror plate 75 …… Stamper, 77 …… Inner circumference clamp 78 …… Outer circumference clamp 80 …… Locking member 81,89,90… … Piston rod 82 …… Piece member 85 …… Clamp ring 97 …… Punch 98 …… Eject pin 100 …… Ejector 101 …… Fixed sleep

Claims (1)

[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. A stamper that forms a part of the mold forming surface, and a clamp member that is provided in the one mold body so as to be retractable from the mold forming surface and that fixes the inner peripheral portion of the stamper to the one mold body. An information recording disk injection molding apparatus, comprising: locking means for locking the clamp member when the clamp member is at the clamp position, wherein the locking means is in a direction substantially perpendicular to the protruding / retracting direction of the clamp member. Lock the clamp member Locking member provided between the locking position and the unlocking position, the locking member having a pair of inclined surfaces inclined with respect to the moving direction, and the clamping member protruding and retracting in the chamber formed in the mold body. A piston rod that is movably provided in a direction substantially parallel to the direction and that can slidably contact the one slope at the tip, and a pressurized gas supply that supplies pressurized gas into the chamber and drives the piston rod. Information recording means, a piece member slidably contacting the other slope, and a biasing means for biasing the piece member toward the other slope in a direction substantially parallel to the protruding / retracting direction. Disc injection molding equipment.