JPH02276610A - Injection molding equipment of information recording disc - Google Patents

Abstract

PURPOSE:To easily and rapidly exchange stamper by a method wherein a positioning means, which positions an engaging member having engaging projection inserted in a guide groove shiftably provided between engaging position and non-engaging position and, at the same time, loosely inserted in an engaging groove, in the advancing and retreating direction of a clamping member to a mold body to either one of the engaging position and the non-engaging position, is provided. CONSTITUTION:When pressing gas is fed in a chamber 63a, an engaging member 80 is separated from an inner peripheral clamp 77 and the clamped state of the inner peripheral part of a stamper 75 with the inner peripheral clamp 77 is released. On the contrary, when the supply of the pressing gas to the chamber 63a is stopped, the inner peripheral clamp 77 clamps the inner peripheral part of the stamper 75. Thus, the clamping and the release of clamping of the inner peripheral part of the stamper 75 is performed only by supplying pressing gas and stopping the supply of the pressing gas to the chamber 63a through the actuation of a switch, for example, resulting in allowing to very easily and rapidly exchange the stamper 75.

Description

[Detailed description of the invention] Technical field The present invention relates to an information recording disk injection molding apparatus.

BACKGROUND OF THE INVENTION Most transparent substrates of information recording disks such as optical disks are formed by injection molding equipment using materials such as PC (polycarbonate) and PMMA (polymethyl methacrylate).

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

As shown in FIG. 9, in such a conventional device, a fixed mold body 1 having a molding surface and fixed on a base (not shown)
It has a fixed mold body 1 and a movable mold body 2 provided on the base so that the molding surfaces thereof face each other and are movable in a direction perpendicular to the molding surfaces. 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 to each other.

The fixed mold body l consists of a fixed mold plate 3, a disk-shaped fixed mirror plate 4 forming one side of the substrate to be molded, and a mounting template 5 for attaching the fixed mirror plate 4 to the fixed mold plate 3. . A hollow cooling sleeve 6 is inserted through the center of the fixed mirror plate 4, and a cylindrical spool 7 is provided within the cooling sleeve. The spool 7 guides the molten material to be molded, which is 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 a surface for supporting the other surface of the substrate to be molded, that is, a stand bar 11, and a movable mirror plate 11 attached to the movable mold plate 10. It consists of a mounting template 13 to be attached. Standby 1
Reference numeral 1 denotes a thin plate-shaped and annular member for forming a signal recording bit, and the inner and outer circumferential parts of this stand bar 11 are respectively attached to the inner and outer circumferential parts of the movable mirror plate 12. A cylindrical inner circumferential clamp 14 and an annular outer circumferential clamp 15 are provided, respectively, to press and fix the movable mirror plate 12. The outer peripheral clamp 15 has a 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 projection 14a projecting into the mold space 9, and presses the inner peripheral portion of the stand bar 11 against the movable mirror plate 12 with the projection. Note that the inner peripheral clamp 14 is locked to the movable mold body 2 by a locking pin 16 at the clamp position.

A tubular punch air is provided within the cylindrical inner peripheral clamp 14 so as to be movable in the direction of arrow S, which is a direction perpendicular to the molding surface of each of the mold bodies 1 and 2. The tip of the bunch air forms a part of the molding surface, in this case a part corresponding to the center hole of the substrate to be molded by cooling and solidifying the material to be molded. The punch 17 is connected to the output shaft of a hydraulic cylinder and driven in the direction of arrow S, and the fixed mold body 1
In cooperation with a die 18 provided on the side, a center hole is bored in the substrate. Note that the cooling sleeve 6 and spool 7 located within the die 18 are retracted along with this drilling operation.

An eject pin 20 is provided inside the punch 17 so as to be able to reciprocate in the direction of the arrow S for ejecting from the punch 17 a portion corresponding to the center hole of the substrate punched out by the bunch air. This eject pin 20 is also driven by a hydraulic cylinder (not shown).

An ejector 21 and a fixed sleeve 22 each having a cylindrical shape are provided between the inner peripheral clamp 14 and the punch 17. The ejector 21 is for extruding the molded substrate to separate it from the movable mirror surface l1i212 and the stand bar 11, and 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 body 2 with bolts 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 stand bar 11.

Next, a description will be given of a locking means for locking the inner peripheral clamp 14, which presses the inner peripheral portion of the stand bar 11 against the movable mirror plate 12, to the movable mold body 2 when the inner peripheral clamp 14 is in the clamp position.

As shown in FIG. 10, a plurality of locking pins 16 for locking the inner clamp 14 at the clamp position are arranged at equal pitches in the circumferential direction of the inner clamp 14 in the movable mold plate 10. Moreover, it is movable in the direction of arrow R, which is the radial direction of the inner peripheral clamp 14. On the side of each locking pin 16, a disc-shaped rotating member 25 is attached to the inner peripheral clamp 1.
It is rotatably provided around 4. The rotating member 25 has spiral teeth on one main surface, and each locking pin 16
The teeth formed in the spiral teeth mesh with the spiral teeth. The other main surface of the rotating member 25 has radial teeth formed thereon to form a so-called face gear, and a pinion 26 meshes with the radial teeth. Binion 26 is rod member 2
7, the other end of the rod member protrudes outside the movable mold plate 10, and a handle 2 is attached to the other end.
8 is attached.

Next, the operation of the information recording disk injection molding apparatus configured as described above will be explained.

First, the movable mold body 2 is strongly pressed against the fixed mold body 1 to clamp the mold and form a mold space 9. Then, the molten material to be molded is injected from the nozzle 8 and guided into the mold space 9 by the spool 7. The material to be molded that has reached the mold space 9 is cooled and solidified to form a substrate. After this, as a perforation process, punch air is ejected,
At the same time, the cooling sleeve 6 and the spool 7 are retracted together with the center of the substrate to be punched out. This forms a central hole in the substrate.

Next, the fixed mold body 1 is attached together with the substrate on which the movable mold body 2 is molded.
At the same time, the eject bin 20 protrudes and the center portion of the substrate, which has already been punched out and attached to the tip of the punch 17, is separated from the bunch air. Then, as a mold release step, pressurized gas is supplied to the air blow groove 21a, whereby the substrate is slightly lifted from the molding surface of the movable mold body 2. Thereafter, the ejector 21 protrudes and the substrate is peeled off from the movable body 2 and recovered.

Next, in the injection molding apparatus having the above-described configuration, the standby 1
The work involved in replacing item 1 will be explained.

First, the movable mold body 2 is separated from the fixed mold body 1 by a large distance. Then, the outer peripheral clamp 15 that clamps and fixes the outer peripheral portion of the stand bar 11 to the movable mirror plate 12 is removed from the movable mirror plate 12 by removing the fastening bolt (not shown). Thereafter, the rotating member 25 is rotated via the knob 28 to release the locking state of the inner peripheral clamp 14 by the locking pin 16.

As a result, the clamping of the inner peripheral portion of the stamper by the projection 14H of the inner peripheral clamp 14 is released, and the stamper 11 can be removed. Thereafter, attach a new standby by following the process in reverse to the above.

In the conventional device described above, the operator is required to manually rotate the handle 28 each time the stand bar 11 is replaced, which is a nuisance for the operator. Furthermore, expensive processing is required, such as manufacturing the rotating member 25 with complicated teeth and forming a deep hole in the movable mold plate 10 to insert the rod 27, resulting in an increase in costs. .

Summary of the Invention The present invention has been made in view of the above points, and includes:
The purpose is to provide an information recording disk injection molding apparatus that allows standby bars to be replaced easily and quickly and that also achieves cost reduction.

The information recording disk injection molding apparatus according to the present invention has a cylindrical clamp member that is movable in and out of the molding surface of the mold body and is rotatable to fix the inner peripheral part of the stand bar to the mold body when it is in the clamp position. A locking means is provided on the outer periphery of the clamp member, and includes a guide groove extending substantially parallel to the direction in which the clamp member protrudes and retracts, and is open at the end in the retraction direction; A locking groove that is provided in communication and extends substantially parallel to the circumferential direction of the clamp member, and a locking groove that is provided so as to be movable between a locking position and a non-locking position in the direction in which the clamp member extends and retracts with respect to the mold body. a locking member having a locking protrusion that can be inserted into the guide groove and loosely inserted into the locking groove; and positioning for positioning the locking member in either the locking position or the non-locking position. It is characterized by consisting of means.

Embodiment Hereinafter, an information recording disk injection molding apparatus as an embodiment of the present invention will be described 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 mounted on the base so that the molding surfaces of the mold body 41 face each other. It also has a movable mold body 42 that is movable in a direction perpendicular to the molding surface. Although not shown, a hydraulic cylinder is provided as mold clamping means for moving the movable mold body 42 and strongly pressing it against the fixed mold body 41 to clamp the two mold bodies together. There is.

The fixed mold body 41 includes a 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 a fixed mold plate 47 connected to the main surface of the fixed back plate 47 by bolts 48. a disk-shaped fixed mirror plate 49 that forms one side of the substrate to be molded; and a fixed mold plate 44.
The fixed back plate 47 is fixed by bolts 51 to
and an annular fixed mounting plate 52 that prevents the fixed mirror plate 49 from shifting in the radial direction. A die 54 is provided in the center of the fixed mirror plate 49 so as to form a part of the molding surface. The die 54 functions to punch out the center hole of the substrate in cooperation with a punch to be described later. A counter punch 55, a cooling sleeve 56, and a spool 57 each having a cylindrical shape are provided concentrically so as to be surrounded by the die 54. Further, a heater 59 is interposed between the cooling sleeve 56 and the spool 57. The spool 57 has an injection means (not shown in its entirety) connected to its nozzle 60.
A molding material such as PMMA (polymethyl methacrylate) in a molten state is injected by a fixed mold body 41.
and guide the movable mold body 42 into a mold space 61 defined by each mold forming surface. Further, the heater 59 is provided to prevent the material to be molded from coagulating within the spool 57. Also,
The counter punch 55 applies a counter-insertion force to the punching force produced by the punch, which will be described later.

On the other hand, the movable mold body 42 includes three movable mold plates 63, 64 and 65 fastened to each other by bolts 62, etc., and a disk-shaped movable mold plate fixed to the main surface of the innermost movable mold plate 63 by bolts 66. A back plate 67, a disk-shaped movable mirror plate 69 connected to the main surface of the movable back plate 67 by bolts 68, and a radius of the movable back plate 67 and movable mirror plate 69 fixed to the movable mold plate 63 by bolts 71. It consists of an annular movable mounting plate 72 that prevents directional displacement.

A stand bar 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 standber 75 is for forming signal recording pits,
It is formed into a thin plate and annular shape.

Water channels 49a and 69a are formed on the back surfaces of the fixed mirror plate 49 and the movable mirror plate 69, and the material to be formed is cooled and solidified by water that is circulated and supplied into the water channels by a water supply means (not shown). is encouraged.

In the parts corresponding to the inner and outer peripheral parts of the stand bar 75,
A cylindrical inner circumferential clamp 77 and an annular outer circumferential clamp 78 are provided, respectively, for pressing and fixing the inner circumferential portion and the outer circumferential portion of the stand bar 75 toward the movable mirror plate 69, respectively. The inner circumferential clamp 77 is provided so as to be able to protrude and retract from the molding surface of the stand bar 75 on the movable mirror plate 69, and as shown in FIG.
7a, and the inner peripheral portion of the stand bar 75 is pressed against the movable mirror plate 69 by the protrusion.

As is clear from FIG. 3, an L-shaped groove 77e is formed on the outer periphery of the rear end of the cylindrical inner clamp 77.
is formed. The groove 77e has a rectangular cross-sectional guide groove 77f that extends parallel to the central axis of the inner clamp 77, that is, in the direction of protrusion and retraction of the inner clamp 77, and has one end open toward the rear of the inner clamp 77; It consists of a locking groove 77g extending in the circumferential direction of the circumferential clamp 77 and having a rectangular cross-section, one end of which communicates with the other end of the guide groove 77f.

On the other hand, a locking member 80 is provided in the movable mold plate 63, and a locking protrusion 80e having a rectangular cross section, which the locking member 80 has, can engage with the groove 77e. ing. Note that the locking protrusion 80e is smoothly inserted into the guide groove 77f, and loosely inserted into the locking groove 77g with a relatively large gap. This locking member 80 engages with the inner wall surface of the locking groove 77g of the groove 77e of the inner peripheral clamp 77 with its locking protrusion 80e, and
7 to the clamp position, that is, the stand bar 75 to the movable mirror plate 6
Lock it at the position where you press it towards 9.

Note that the inner peripheral clamp 77 is rotatable.

The locking member 80 moves in the direction of protrusion and retraction of the inner peripheral clamp 77 (arrow S
It is movable in both directions.

The locking member 80 is located at a position shown by a solid line in FIG. 2, that is, a locking position where the inner peripheral clamp 77 is locked, and at a position shown by a two-dot chain line in FIG. 8, that is, a locking position of the inner peripheral clamp 77. and the unlocked position. Note that at this time, the locking protrusion 80e moves within the locking groove 77g.

A piston rod 81 is provided in a chamber 63 a formed in the movable mold plate 63 so as to be movable in the direction of protrusion and retraction of the inner peripheral clamp 77 (direction of arrow S), and the tip of this piston rod 81 is located behind the locking member 80 . It touches the edge.

Pressurized gas is supplied into the chamber 63a by a pressurized gas supply means (not shown), whereby the piston rod 8
1 is driven in the protruding direction, and the locking member 80 is moved to the non-locking position.

On the other hand, a coil spring 83 is provided within the movable back plate 67 to bias the locking member 80 toward the locking position.

A positioning means for positioning the locking member 80 at either the locking position or the non-locking position is provided by the pneumatic cylinder consisting of the piston rod 81 and the chamber 63a, the pressurized gas supply means, and the coil spring 83. It is configured. Further, this positioning means and the locking member 80 constitute a locking means that locks the inner peripheral clamp 77 when it is in the clamp position.

On the other hand, an annular suppressing member, that is, an outer peripheral clamp 78 that presses and fixes the outer peripheral part of the stamper 75 to the movable mirror plate 69.
An annular groove 78a is formed on the outer circumferential surface of the groove 78a. As shown in FIG. 3, an annular clamp ring 85 as a locked member is provided so as to fit around the outer peripheral clamp 78. The crumbling ring 85 is arranged so as to be sandwiched between the fixed mounting template 52 and the movable mounting template 72, which are the respective constituent members of the fixed mold body 41 and the movable mold body 42. A plurality of sliding pins 86 are fixed to the clamping ring 85 at equal intervals in the circumferential direction, and the tips of the sliding pins 86 are slidably engaged in an annular groove 78a formed in the outer peripheral clamp 78. It matches. That is, the clamp ring 85 is slidable with respect to the outer peripheral clamp 78 in a plane parallel to each molding surface of the fixed mold body 41 and the movable mold body 42.

As shown in FIG.
2a and 72a are formed.

A plurality of both chambers 52a and 72a are provided along the circumferential direction of the fixed mounting template 52 and the movable mounting template 72 so as to be arranged at regular intervals and alternately. Each chamber 52a and 72a includes 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 arrow S perpendicular to each molding surface and protrude from the molding surface. The locked member, that is, the clamping ring 85 locks the fixed mold body 41 by engaging with these piston rods 89 and 90.
and is locked to the movable mold body 42. Pressurized gas is supplied into each chamber 52a and 72a by a pressurized gas supply means (not shown), thereby driving each piston rod 89 and 90 in the projecting direction, that is, toward the unlocked position. Further, coil springs 92 and 93 are provided in the chambers 52a and 72a to apply a bias force to each piston rod 89 and 90 in the storage direction, that is, toward the locking position.

As shown in FIG. 4, each of the piston rods 89 and 90 described above is provided with circular large diameter portions 89a and 90a. A plurality of circular through holes 85a and 85b are formed in the clamp ring 85 as a member to be locked, into which the large diameter portions 89a and 90a can be inserted. The clamp ring 85 also includes a large diameter portion 89 of one piston rod 89.
A long hole 8 that communicates at one end with a through hole 85a into which a can be inserted.
5C is formed. This elongated hole 85c is formed in the direction of movement of the clamping ring 85 with respect to the outer peripheral clamp 78 (arrow Q
direction) and has a width diameter smaller than the large diameter portion 89a of the piston rod 89,
A portion other than the large diameter portion of No. 9 can be inserted. Also, a through hole 85 into which the large diameter portion 90a of the other piston rod 90 can be inserted is provided.
A long hole 85d communicating at one end is formed in b. The elongated hole 85d is arranged so as to be sandwiched between the through hole 85b communicating with itself and the other elongated hole 85C described above, and extends parallel to the other elongated hole 85c (in the direction of arrow Q), and It has a width smaller than the large diameter portion 90a of the piston rod 90, and a portion of the piston rod 90 other than the large diameter portion can be inserted therethrough. As shown in FIG. 4, when the large diameter portion 89a of one piston rod 89 can be inserted into and removed from the through hole 85a of the crumbling ring 85, the portion of the other piston rod 90 other than the large diameter portion 90a is long. It is inserted into the tip of the hole 85d. That is, the clamping ring 8 which is the member to be locked
5 is one mold body, in this case, by the large diameter portion 90a of the piston rod 90 together with the outer peripheral clamp 78 held therein.
It is locked to the movable mold body 42. As a result, the outer peripheral portion of the stamper 75 is fixed to the movable mold body 42. The position of the crumbling ring 85 at this time is referred to as a first position. A second position is a position where the clamp ring 85 is rotated by a predetermined angle from the first position relative to the outer peripheral clamp 78 and 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. It is called. When the crumbling ring 85 is in this second position, the piston rod 89 is in its large diameter portion 89, contrary to the above.
The portion other than a is inserted into the tip of the elongated hole 85c. Therefore, 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.
The stamper 75 is released from the state of being locked to the movable mold body 42, thereby releasing the pressing state of the stamper 75 by the outer peripheral clamp 78.

As shown in FIG. 4, a handle 95 is protruded from the outer periphery of the clamp ring 85, and by operating the handle 95, the clamp ring 85 can be moved to the first and second positions with respect to the outer clamp 78. be moved between

As shown in FIG. 1, a guide pin 96 is attached to the crumbling ring 85 by threading its threaded portion, and the guide pin 96 is inserted into the guide hole formed in the movable back plate 67 and the movable mirror plate 69. The pin 96 can be fitted smoothly.

Further, as described above, the piston rod 89 controls the fixation 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 two mold bodies.
, 90, it is easy to reduce costs in the information recording disk injection molding apparatus that includes many pneumatic cylinders for moving other movable members.

As shown in FIGS. 1 and 2, a fixed mold body 41 and a movable mold body 4 are contained in the inner peripheral clamp 77 formed in a cylindrical shape.
A tubular punch 97 is provided so as to be movable in the direction of arrow S, which is a direction perpendicular to the molding surface of each of the two molds.

The tip of the punch 97 is a part of the molding surface, in this case,
A portion corresponding to the center hole of the substrate to be molded is 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 cooperates with the die 54 provided on the fixed mold body 41 side to punch a center hole in the substrate. Note that the counter bunch 55, cooling sleeve 56, and spool 57 located within the die 54 are retracted in the direction in which the bunch 97 protrudes as a result of this punching operation.

Inside the bunch 97, an eject bin 98 is provided so as to be able to reciprocate in the direction of arrow S for removing from the bunch 97 a portion corresponding to the center hole of the substrate punched out by the bunch 97 and attached to the tip of the bunch. There is. This eject bin 98 is also driven by a hydraulic cylinder (not shown).

An ejector 100 and a fixed sleeve 101 each having a cylindrical shape are disposed between the inner peripheral clamp 77 and the bunch 97.
are arranged concentrically. The ejector 100 extrudes the molded substrate to the stamper 75.
It is for peeling off from the surface, 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 body 42 with 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. Pressurized air is supplied to the air blow groove 101a from a gas supply pump (not shown), and the pressurized air is blown out from the minute gap 102 between the inner peripheral clamp 77 and the fixing sleeve 101 when the molded substrate is released from the mold. The molded substrate is extruded and peeled from the stand bar 75.

As is particularly clear from FIG. 2, there is a gap between the ejector 100, which is a protruding and retractable member provided to protrude and retract from the molding surface of the movable mold body 42, and the fixed sleeve 101, which forms a part of the mold body. A minute gap 103 is provided near the molding surface. By providing such a minute gap 103, the melted material to be molded is prevented from entering between the ejector 100 and the fixed sleeve 101, and the occurrence of flash is reduced. Furthermore, the ejector 100 and the fixed sleeve 10 are connected to each other on the opposite side of the molding surface with respect to the minute gap 103.
A plurality of, for example, spherical transfer bearing members 105 made of, for example, steel or resin are arranged between the ejector 100 and the ejector 100.
They are interposed at equal intervals along the direction of movement.

Further, a cylindrical retainer 106 made of resin or the like is provided to hold each rolling bearing member so that the distance between the rolling bearing members 105 does not change. In this way, the bearing member 10 is transferred between the ejector 100 that moves in and out of the molding surface of the movable mold body 42 and the fixed sleeve 101 that guides its movement.
5 prevents abrasion powder from being generated between the ejector 100 and the fixed sleeve 101. Note that the transfer bearing member 105 may also be provided between the bunch 97 and the ejector 100.

As is clear from the above description, the minute gap 102 through which pressurized air is ejected to separate the molded substrate from the stand bar 75 is provided outside the ejector 100 that appears and retracts. Therefore, the ejected pressurized air is blocked by the ejector 100 and is not supplied toward the center hole of the molded substrate, but is supplied toward the outer periphery of the substrate. Thereby, the substrate can be effectively released from the mold.

Next, the operation of the information recording disk injection molding apparatus configured as described above will be explained.

First, the movable mold body 42 is brought close to the fixed mold body 41 by the mold clamping means, and is pressed against the fixed mold body 41 by strong hydraulic pressure, thereby clamping the mold. A mold space 61 is thereby formed. Then, the molten material to be molded is injected through the nozzle 60, and passes through the spool 57 into the mold space 6.
1, and the material to be molded is filled into the mold space under a predetermined pressure. The molten material to be molded is cooled and solidified in the mold space 61, thereby forming a substrate. Note that information recording pits are formed on this substrate by a stamper 75. After this, as a drilling process, the bunch 97
are made to protrude into the mold space 61, and at the same time the counter bunch 55, the cooling sleeve 56 and the spool 57 are inserted into the bunch 9.
7 and retreats, thereby forming a central hole in the substrate.

Thereafter, the movable mold body 42 is separated from the fixed mold body 41 with the molded substrate attached thereto by the mold clamping means.

At the same time, the eject pin 98 protrudes, and the center portion of the substrate, which has been punched out from the main body of the substrate by the punch 97 and attached to the tip of the punch, is separated from the punch. Then, in the mold release process, pressurized air is supplied to the air blow groove 101a formed on the outer peripheral surface of the fixed sleeve 101, and this pressurized air blows out through the minute gap 102 to blow the substrate to the stand bar 75 on the movable mold body 42. It rises slightly from. Thereafter, the ejector lOO is made to protrude, and the substrate is peeled off from the stand bar 75 and the movable mold body 42 and recovered.

Next, the operation for replacing the standby bar 75 in the information recording disk injection molding apparatus having the above-described structure will be described with reference to FIGS. 5 to 8. Note that the stand bar 75 is fixed to the movable mold body 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 and the mold is clamped. Then, a predetermined switch is operated to supply pressurized gas into each chamber 52a, 72a in the fixed mounting template 52 and the movable mounting template 72. As a result, the piston rods 89 and 90 are made to protrude as shown in FIG.
The clamping state of the clamp ring 85 and the outer circumferential clamp 78, which had been locked, is released. Therefore, crumbling 8
5 is rotatable relative to the outer peripheral clamp 78, the handle 95 of the clamp ring 85 is operated to rotate the clamp ring 85, and the clamp ring 85 is brought from the first position to the second position. Thus, the large diameter portion 90a of the piston rod 90 fits into the through hole 8 of the clamp ring 85.
5b, and a portion of the other 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. Thereafter, the above switch is operated to cut off the supply of pressurized gas into the chambers 52a, 72a. Therefore, as shown in FIG. 6, each piston rod 89 and 90 has a coil spring 92 and
3, the clamping ring 85 is moved in the storage direction by the urging force of the piston rod 8 together with the outer peripheral clamp 78.
The stand bar 75 is fixed to the fixed mold body 41 by the large diameter portion 89a of 9 and released from the locked state to the movable mold body 42, thereby releasing the state in which the outer peripheral portion of the stand bar 75 is suppressed by the outer peripheral clamp 78.

On the other hand, as shown in FIG. 3, the locking protrusion 8 of the locking member 80
0e is engaged with the locking groove 77g of the groove 77e of the inner peripheral clamp 77, whereby the inner peripheral clamp 77 is locked at the clamp position, that is, the position where the stand bar 75 is pressed against the movable mirror plate 69. .

However, the locking protrusion 80e is locked? m 77 g, and is strongly pressed against the rear side surface of the locking groove 77g by the biasing force of the coil spring 83. In this state, a switch or the like is operated to supply pressurized gas into the chamber 63a in the movable mold plate 63, causing the piston rod 81 to protrude.

Then, the locking member 80 is moved to the lock release position shown by the two-dot chain line in FIG. 2 against the biasing force of the coil spring 83. As a result, the inner peripheral clamp 77
is released from the locked state. From this state, the inner peripheral clamp 77 is rotated in the direction of arrow M. Then, the locking member 80
The locking protrusion 80e is located at the bent portion of the L-shaped groove 77e, that is, at the joint between the guide groove 77f and the locking groove 77g.

As shown in FIG. 7, in this state, the inner peripheral clamp 77
Pull it forward (in the direction of arrow T). Then, the locking member 8
The locking protrusion 80e of 0 is detached from the inner peripheral clamp 77 via the guide groove 77f. As a result, the state in which the inner peripheral portion of the stand bar 75 is suppressed by the inner peripheral clamp 77 is released. In this way, the suppressed state of both the inner and outer peripheral parts of the stand bar 75 is released, and when the movable mold body 42 is separated from the fixed mold body 41 as shown in FIG. It can be recovered. After this,
A new standber is installed by following the completely opposite process to the above, and the standby replacement work is completed. In addition, as shown in FIGS. 3 and 7, the inner peripheral clamp 77 includes:
In order to smoothly fit the locking protrusion 80e of the locking member 80 into the guide groove 77f of the groove 77e, a guide slope 77h that guides the locking protrusion 80e is provided at the open end of the guide groove 77f.
is formed. In addition, the guide groove 77f and the locking groove 77g
A guide slope 77i is also provided at the joint portion of the guide plate 77i to facilitate smooth transition of the locking protrusion 80e between the two grooves.

As mentioned above, in the embodiment described above, the chamber 6
When pressurized gas is supplied into 3a, the locking member 80 is disengaged from the inner circumferential clamp 77, and the state in which the inner circumferential portion of the stamper 75 is clamped by the inner circumferential clamp 77 is released. And vice versa,
By cutting off the supply of pressurized gas into the chamber 63a, the inner peripheral clamp 77 clamps the inner peripheral portion of the stamper 75.

In this way, the inner peripheral portion of the stamper 75 can be clamped and unclamped by simply supplying and stopping the supply of pressurized gas to the chamber 63a by operating a switch, for example, making it extremely easy to replace the stamper 75. It can be done quickly.

Effects of the Invention As detailed above, in the information recording disk injection molding apparatus according to the present invention, there is provided a clamp member that is movable in and out of the molding surface of the mold body and rotatable for fixing the inner circumferential portion of the stamper to the mold body. A locking means for locking the clamp member when it is in the clamp position includes a guide groove that is provided on the outer periphery of the clamp member and extends substantially parallel to the direction of protrusion and retraction of the clamp member and that is open at the end in the retraction direction; a locking groove provided on the outer periphery 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 in the direction of protrusion and retraction of the clamp member with respect to the mold pair; a locking member having a locking protrusion that is movably provided between the guide grooves and can be inserted loosely into the locking groove; and the locking member is moved between the locking position and the non-locking position. and positioning means for positioning at either one of the two positions.

Because of this configuration, the stamper can be clamped and unclamped simply by operating a switch that controls the driving of the locking member, and the stamper can be replaced extremely easily and quickly. In addition, if the switch is linked to the main switch that controls the operation and stop of the entire injection molding machine, or if the main switch itself is used to control the clamp operation, it is possible to It is not necessary to turn off the clamp operation control switch, which saves time and effort, and the main switch is always turned off when replacing the stamper, which is preferable from the viewpoint of safety.

In addition, with this configuration, it is difficult to form a deep insertion hole for inserting an expensive rotating member with complicated teeth or a long rod to which a handle is connected, as in conventional devices. This eliminates the need for machining and reduces costs.

[Brief explanation 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, FIG. 2 is an enlarged sectional view of main parts of the information recording disk injection molding apparatus shown in FIG. 1, 3 and 4 are perspective views of main parts of the information recording disk injection molding apparatus shown in FIG. 1, and FIGS. 5 to 8 are information recording disk injection molding apparatus shown in FIGS. 1 to 4. An explanatory diagram of the operation of the apparatus, FIG. 9 is a side view including a partial cross section of a conventional information recording disk injection molding apparatus, and FIG. 10 is an enlarged sectional view of the main part of the conventional apparatus shown in FIG. Description of symbols of main parts 41...Fixed body 42...Movable body 44...Fixed plate 47...Fixed back plate 49... ... Fixed mirror plate 54 ... Dice 55 ... Counter punch 56 ... Cooling sleeve 57 ... Spool 63.64.65 ...・Movable template 69...
- Movable mirror plate 75... Stamper 77... Inner circumferential clamp 77f... Guide groove 77g...
...Latching groove 78...Outer circumference clamp 80...Locking member 80e...Latching protrusion 81.89.90...Piston rod 8
2... Bridge member 83... Coil spring 85... Crumbling 97... Punch 98... Eject bin 100...・Ejector 101... Fixed sleeve

Claims (2)

[Claims] (1) A pair that forms a molding surface, is arranged so that the molding surfaces face each other, moves relatively to the molding surface in a direction substantially perpendicular to the molding surface, and forms a mold space by the molding surface. a mold body, 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 clamping, and a a stamper forming a part of the molding surface; and a cylinder provided on the one molding body so as to be able to move in and out of the molding surface and rotatably, and fixing an inner peripheral part of the stamper to the one molding body. An information recording disk injection molding apparatus comprising: a clamp member having a shape of 1, and a locking means for locking the clamp member when the clamp member is in the clamp position, the locking means having the clamp member at an outer peripheral portion of the clamp member. a guide groove extending substantially parallel to the direction of protrusion and retraction of the member and open at an end in the retraction direction; and a guide groove provided in the outer peripheral portion so as to communicate with the guide groove and extending substantially parallel to the circumferential direction of the clamp member. an elongated locking groove; the mold body is provided movably between a locking position and a non-locking position in the protruding and retracting direction, and can be inserted into the guide groove and loosely inserted into the locking groove; An information recording disk injection molding apparatus comprising: a locking member having a locking protrusion; and positioning means for positioning the locking member at either the locking position or the non-locking position. (2) The positioning means is provided in a chamber formed in the mold body so as to be movable in a direction substantially parallel to the projecting and retracting direction, and the locking member is moved to either the locking position or the non-locking position. a pressurized gas supply means for supplying pressurized gas into the chamber to drive the piston rod; and an urging force for urging the locking member toward the one side relative to the other side. 2. The information recording disk injection molding apparatus according to claim 1, further comprising means.