JPS6141738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording medium manufacturing apparatus for manufacturing high-density information recording media such as video disks and digital audio disks.

Generally, in audio record manufacturing equipment, a pair of separated record labels are first sent to an extruder, and then the extruder molds the material for one record between the labels. The package or biscuit is extruded and sent to a press, which is responsive to the extrusion and starts its molding cycle to produce a given audio record.

On the other hand, high-density information recording media, such as video disks (of course, the audio information corresponding to the video information is recorded on them), are mixed with about 5% to 30% carbon to make them conductive. FM modulated signals are transmitted through multiple pits on a flat disc made of vinyl chloride resin.
For example, the pits are carved in a spiral pattern with a track pitch of 1.35 μm, and the signal is read out by tracing the pits with a diamond needle equipped with a metal film electrode, and using the static formed between the disk and the needle electrode. It is designed to reproduce using changes in capacitance. The outer diameter of the disk is approximately 26 cm and the speed is 900 per minute.
Rotate times.

As mentioned above, video discs are completely different from general audio records, in that they contain not only audio information but also video information in high density. It is clear that, like audio records, if these could be mass-produced, it would be very convenient and would greatly contribute to the development and improvement of education and culture.

Therefore, the present inventors proposed that, for example, 5% to
Even under difficult conditions, such as using vinyl chloride resin mixed with about 30% carbon to make it conductive, high-density information recording media such as video discs can be mass-produced in the same way as ordinary audio records. The general objective is to provide such a manufacturing device.

Another object of the present invention is to configure the preforming means for preforming the material to be molded extruded by the extrusion means to be in the same direction as the extrusion direction of the extrusion means, and to form the material to be molded by the extrusion means. The present invention provides an information recording medium manufacturing apparatus configured to form a molded part having a predetermined shape having a through hole in the center.

According to the device of the present invention, the entire device can be downsized;
This improves the space factor, simplifies the process, and improves the accuracy of the center hole.

Another object of the present invention is to configure the case (mold) structure for pressing the preformed parts so that it is larger than the final external shape of the information recording medium, and to concentrate strain on this large part. An object of the present invention is to provide an apparatus for manufacturing an information recording medium.

According to the apparatus of the present invention, since heat is uniformly transmitted to the molded information recording medium, distortion at the outer circumferential portion is eliminated and the flatness is improved, so that a good information recording medium of this type can be obtained.

Still another object of the present invention is to provide an information recording medium manufacturing apparatus in which means for discharging the bordered overflow portion is comprised of a flow table, a flow stopper, and a chute.

According to the device of the present invention, the overflow portion is smoothly discharged and recovered outside the device.

Further objects and features of the present invention will become clear from the description given below in conjunction with the drawings.

In the following explanation, the explanation will be focused on an apparatus for manufacturing video discs, but it will be clear from the following explanation that the apparatus is not limited to this.

FIG. 1 is a system diagram for explaining the information recording medium manufacturing apparatus according to the present invention, in which the extrusion means for the material to be molded, the preforming means, the pressing means, the edging means, and the discharging means are shown. Means means checking means and means storing means.

The following explanation will be given based on this system diagram.

FIG. 2 shows a schematic configuration of an information recording medium manufacturing apparatus according to the present invention.

As shown in FIGS. 2A to 2C, the configurations of the information recording medium manufacturing apparatus according to the present invention can be roughly divided into three groups.

In the figure, A is a plan view, B is a front view, and C is a front view.
is its side view.

2A and 2B are a plan view and a front view showing the extrusion mechanism for the material to be molded which is the first group in the present invention, and a press mechanism part, and FIG. 3 is a sectional view showing the nozzle part of the extruder. be.

On the upper side of the extruder 1, a supply section 2 for a vinyl chloride or carbon-based conductive resin material is provided.
The material to be molded is supplied by a supply means (not shown). Continuously connected to this supply section 2, a cylinder 4 is attached which is rotatably driven by a drive means (not shown) and fitted with a spiral screw 3 that extrudes the material to be molded supplied from the supply section 2. There is. A nozzle 5 is attached to the tip of the cylinder 4 on the downstream side (press machine side).

This nozzle 5 is provided with a nozzle opening 6 so that the material to be molded extruded from the cylinder 4 can be extruded.

The cylinder 4 is provided with a steam flow path 7 heated to about 100° C. to 200° C. in order to prevent the material to be molded supplied from the supply section 2 from cooling and hardening.

The material to be molded, which is supplied from the supply section 2 by the extruder 1 configured as described above, flows into the cylinder 4 and is appropriately kneaded by the screw 3 to have an appropriate viscosity for a video disc. It is extruded in the direction of the nozzle 5 and is extruded from the nozzle opening 6.

The material to be molded for one disk extruded from the nozzle port 6 is supplied to a cake cup 12 for preforming.

If these cake cups 12 are lined up, the upper cup 1
2A and a lower cup 12B, and further includes a movable cup 13 arranged at predetermined positions of the upper and lower cups 12A and 12B.

Next, the specific structure of the cake cup 12 and the movable cup 13 will be explained in detail with reference to FIGS. 4A to 4E and FIG. 5.

FIG. 4A is a side view of the previous stage in which the cake cup 12 is constructed by the upper and lower cups 12A, 12B and the movable cup 13, and FIG. 4B is a side view of the upper and lower cups 12.
A side view showing a state in which A and 12B have been moved up and down to predetermined positions, respectively; FIG. D shows a state in which the preform placed on the moving cup 13 has been moved onto the case (upper and lower mold) surfaces by the movement of the moving cup. The side view shown in FIG.

FIG. 5 shows an upper cup 12A and a lower cup 12.
FIG. 6 is an enlarged side view showing a state in which B is moved up and down in the direction of the movable cup 13 and a predetermined cake cup 12 is formed.

As described above, the cake cup 12 is composed of an upper cup 12A and a lower cup 12B, and the upper and lower cups 12A and 12B are connected to the plate 14, respectively.
A, 14B, and have predetermined circular curved recesses 12 each having a different curved shape inside.
C, 12D, and a protrusion 12E slightly tapered upward is provided approximately at the center of the lower cup 12B. Note that 20 is a concave groove provided inside the lower cup 12B for inserting a movable cup.

Here, the operation of forming the cake cup 12 will be explained.

First, the movable cup 13 is placed in a state as shown in FIG.
By operating the air cylinders 15 and 16 connected to the upper and lower plates 14A and 14B to move the plate 14A to which the cup 2A is fixed and the plate 14B to which the lower cup 12B is fixed up and down, respectively. As shown in FIG.
is inserted to form a cake cup 12 in which a space 17 is formed for the material to be molded to enter. At this time, the tip of the protrusion 12E is inserted into the through hole 18 provided in the upper cup 12A as shown in FIG.

Furthermore, in this embodiment, the material to be molded that is injected into the space 17 is fed in from a direction perpendicular to the plane of the drawing in FIG.

A flat part 13A is provided at one end of the movable cup 13 on which a cake 21 formed in a predetermined shape is placed. A predetermined circularly curved concave portion 13B is formed to form a cake.

The other end of the movable cup 13 has an arm 13C for placing the cake 21 on the flat surface 13A and transferring it onto the upper and lower molds (cases) 23 and 24 of the press 22; A connected air cylinder 19 is arranged. This movable cup 13 is normally in a position as shown in FIGS.
When placed on A, this is the air cylinder 19
As a result of the operation, the arm portion 13C protrudes forward, and as shown in FIG. 4D, the upper and lower mold cases 23, 2
4.

As shown in FIG. 4E, the cake 21 formed by the above-mentioned preforming means has, for example, an outer diameter D of the flat portion 21A on the lower side of the cake that is the diameter of the innermost circumference of the signal groove of the disk (for example, 85φ). ), and the other portions are formed into circular convex portions 21B and 21C.

21D is a through hole formed by a convex portion 21E provided at the center of the lower cup 12B during preforming.

By forming the cake 21 in this way,
During press molding, this cake 21 is heated under pressure for a predetermined period of time by upper and lower molds (press cases), and extends toward the outer circumference. It comes into contact with the case surface (stamper surface) toward the outer periphery,
This is because the protrusions 21B and 21C are provided.
Air is not introduced during molding, and therefore, no blistering due to air bubbles occurs on the surface of the disc after it is molded into a disc shape.

Next, a press machine for press-molding the preformed parts formed by the above-mentioned preforming device 12 to form a predetermined disk will be explained with reference to FIG. 2B.

This press machine 22 is movable up and down by a hydraulic cylinder 26 installed on a base 25, and is installed on a mounting plate 28 installed at one end of the upper part of the hydraulic cylinder 26 installed on the base 25. Consists of an operating plate (moving frame) 30 slidably supported by the guide post 29, and an upper plate (upper frame) 31 attached to one end of the upper part of the guide post 29 facing the operating plate 30. . A lower mold 24 for molding a required disk is attached to one side of the upper part of the operating plate 30 at a predetermined interval. Similarly, an upper mold 23 is attached to one side of the upper plate 31 facing the operating plate 30, which forms a disk together with the lower mold 24. These upper and lower molds 23 and 24 are entirely formed into a circular shape corresponding to the outer periphery of the disk, and a stamper (not shown) for forming image information, etc. of the disk is arranged on one side of each outer periphery. Set up

The preformed parts (hereinafter referred to as cakes) supplied onto the upper and lower molds by the molding material supply device are shaped into disks of a predetermined shape by the operation (upward movement) of the hydraulic cylinder 26. Press molded. Also, in the upper plate 31, a center pin 33 is inserted into the through hole 21D in the cake 21 and serves as a guide for forming the final inner diameter shape by press molding.
On the other hand, the lower mold (case 24) is provided with a hole 34 for accommodating the center pin 33.

The reason why the relatively large through hole 21D and the center pin 33 inserted therein are provided in the cake 21 is as follows.

That is, for example, in a video disc,
Due to the mechanism of the playback device and the accuracy of the center hole required for the disk itself, the diameter of the hole in the center of the disk is considerably larger than that of ordinary audio records.

By the way, when forming a center hole in a video disc, for example, conventionally, a small diameter hole is first formed as in the case of an audio record, and then a large hole is drilled based on this hole in the next step.

However, according to such conventional methods, there is a limit to the eccentricity value of the small hole initially formed, and
When punching a large hole, since the small hole is used as a basis for punching, deformation, burrs, etc. are added to the eccentricity of the small hole, so there is a drawback that the lateral vibration of the disk becomes large during playback. Ta.

Therefore, in order to eliminate the drawbacks of the conventional method, the present invention forms the through holes 21D in a predetermined shape in advance when making the cake, and the through holes 21D during press molding.
A pin 33 having a predetermined external shape is inserted into D to form a predetermined hole diameter, and then press molding is performed.

In this way, the upper mold 23 is provided with a pin 33 having a predetermined outer shape, for example, approximately the same diameter as the center hole of a video disc, and the upper mold is provided with a hole 34 into which the pin 33 is inserted. Because of this, the process can be simplified compared to the conventional center hole forming method, and the overall labor can be saved.Also, since there is no need to form a small hole, the dimensional accuracy of the center hole can be improved and the hole size can be reduced. Variations can also be reduced.

In this way, by providing the center pin 33 and the opposing hole 34 into which the center pin 33 is inserted at predetermined positions of the upper and lower molds 23 and 24, the cake 21 can be pressed into the press 22. When transferred to predetermined positions on the upper and lower molds 23 and 24,
The center pin 33 is easily inserted into the through hole 21D provided in the cake 21.

According to the present invention, the through hole 2 of the cake 21
Since the hole diameter of 1D is relatively large, there is no need to center punch a large diameter with a large pressing force during pressing, and therefore it is easy to punch the specified size even with a small pressing force during pressing. A through hole is formed. This is an important point when forming the center hole of this type of information recording medium.

In other words, since the information recording medium is made of vinyl chloride or carbon-based conductive resin material as described above, it is a hard material to be molded. This is because the impact force has a considerable effect on the video information portion and the like. Furthermore, when the pressing force is small, it is naturally advantageous in terms of pin life.

Next, the case (mold) will be explained with reference to FIG. 2B and FIGS. 6A to 6E.

6A is a front view of the press machine 22, and FIG. 6B shows the state in which the preformed cake 21 is transported by the moving cup 13 to predetermined positions of the upper and lower molds 23 and 24 of the press machine 22. Partially enlarged front view, C is an enlarged front view showing the arrangement of the center pin 33 and cake 21, D is an enlarged front view showing the state in which the lower mold 24 moves upward and the cake 21 is pressed, FIG. 6E is a front view showing a state in which the center pin 33 and the lower mold 24 have returned to their original positions after press molding.

The state in which the cake 21 is press-molded by the press 22 will be described in detail below using FIGS. 6A to 6E.

First, the preformed cake 21 is shown in FIG.
As shown in FIG. 2, the moving cup 13 is brought to a predetermined position on the lower case 24 of the press 22. In this way, when the cake 21 is brought to a predetermined position, a switch (not shown) is activated, which activates the cylinder 32, and the center pin 33 moves downward to move the cake 21 into the through hole 21D. is inserted, and this cake 21 is held in a predetermined position in the lower mold 24. (FIG. 6C) In this way, when the cake 21 is held in a predetermined position, a switch (not shown) is activated, which causes the hydraulic cylinder 26 to move upward to move the cake 21 held in place.
1 is pressed (press molded) at a predetermined pressure. (6th
Figure D) When press-molded at a predetermined pressure for a predetermined period of time, a disk D with information signals etc. recorded in a predetermined portion is formed, but this disk has a so-called overflow portion and the final external shape is different. do not have.

When the disk with overflow is molded, the disk D is held by grippers, which will be described later, and the center pin 33 moves upward to return to its original position, and the lower mold 24 descends to return to its original position. do. (Fig. 6E) As mentioned above, the disk that has been press-molded for a predetermined period of time under a predetermined pressure has a so-called overflow portion, so in order to give it its final external shape, the overflow portion must be hemmed (trimmed). )Must.

However, in a general trimming process, a molded part with a predetermined shape is trimmed with a cutter to give the desired external shape, but in the case of information recording media, the material to be molded is hard and the above-mentioned As described above, video signals are recorded along with audio signals on a flat disk at a high density from the outer circumference to the inner circumference of the disk, and this trimming is performed only on the outer circumference where video information is recorded. Therefore, careful attention must be paid to the effect of this trimming on the video information section.

Therefore, the inventors of the present invention have designed the upper and lower cases (molds) 23 and 24 in order to prevent the video information from being affected in any way during the trimming process.
The structure was solved as follows, and this point will be explained in detail using FIGS. 7A to 7D.

In addition, in the drawings, the same parts will be explained using the same reference numerals.

First, we will discuss how precision is necessary in information recording media.

As described above, the information recording medium is composed of a plurality of pit rows recorded on a flat disk surface, and is reproduced in a spiral manner from the outer circumference to the inner circumference with a track pitch of, for example, 1.35 μm. The pit has the same width as the pit, 1.35 μm, and a depth of 0.3 to 0.4
Recorded in μm. Therefore, there is no guard band between each track, and the disk surface can be used without waste. The tracking signal pit row is centered on the boundary between tracks, has a width of 0.6 to 0.7 .mu.m, and a depth of 0.05 .mu.m, and is recorded at the position of the horizontal synchronizing signal, superimposed on the information signal at 15.74 KHz sampling. The information signal pit train is a main pit train in which a total of three different signals, video and audio having two frequency-modulated channels, are frequency-modulated and recorded using one carrier wave, and the tracking signal is This is an auxiliary pit row that allows the reproducing needle to correctly trace the information pit row on a disk whose surface is flat and has no mechanical guide grooves. The tracking signal is composed of three different frequencies, two of which control the playback needle to always be in the correct position, and the third signal to control one rotation of the disk. It is made detectable. In the NTSC system, the disk rotates at 900 revolutions per minute, or 15 revolutions per second. Four fields (two frames) are recorded in one rotation, and four vertical synchronization signals are positioned radially at 90 degrees each. The diameter of the disc is 26
cm (10.2 inches), and a maximum of 2 hours of programs can be recorded on the front and back sides of the disc.Therefore, there are 50 billion pits on one disk compared to the number of information pits, making it extremely dense.

These high-density information recording media are produced using the same press production equipment as conventional audio records, but as mentioned above, the information recording media are molded from ordinary materials due to carbon contamination. It is harder than other audio records, and video information signals are recorded at a higher density, and depending on the case (mold) structure, heat may not be transferred uniformly to the information recording medium. The distortion and flatness of the disk outer periphery caused by this will be reflected directly on the screen, so great care must be taken in manufacturing the upper and lower cases (molds).

It should be noted that the information recording medium is not limited to those described above, but can of course also be applied to, for example, a video disc having a guide groove.

Further, the above-mentioned trimming method also requires consideration. Therefore, the inventors of the present invention devised a way to distribute heat uniformly inside the case (mold), and configured the size of the mold to be larger than the final external shape of the information recording medium, thereby causing distortion in this large portion. The aim is to solve this problem by concentrating on
This point will be explained below with reference to FIGS. 7A to 7D.
Here, FIGS. 7A to 7D are a longitudinal side view of the press case, an explanatory view of the case of molding an information recording medium using the press case, and a side view of the completed information recording medium, respectively. That is, above,
The size of the lower case (mold) 23 and 24 is 12 inches (30 cm) larger than the final external dimensions, and the area up to 10.2 inches (26 cm) from the inner circumference is filled with video information, and the rest is blank. It is designed to serve as a recording section. That is, the upper and lower cases 23, 2
In the structure of 4, 36 and 37 are 30cm parts, 3
8 and 39 indicate the 26cm portion, respectively. In addition, 2
3A......23N, 24A...24N are grooves for heating and cooling, respectively. Among these grooves, for example, 23A, 24A, 23N, 24N are media portions (non-recorded portions) 40, 41 that are continuous with the final outer shape. It is provided to the outside of the part where it is formed. As a result, uniform heat is transmitted to the necessary video information areas, and the distorted areas are concentrated on the outer circumferential side of the 26 cm sections 38 and 39, which is the final external shape, so that the required flatness of the disk can be obtained. This seems to be due to the following reasons.

In other words, to mold a disk, first a mold is heated to a predetermined temperature, a preformed part (cake) is brought onto the heated mold, and after being pressed for a certain period of time (approximately 20 seconds), the case ( This heating and cooling process involves cooling the inside of the case (mold), but this heating and cooling is performed by grooves 23A...23N, 24A...
...It is carried out by flowing steam and water through 24N, and it is believed that the temperature is not uniform near the outermost periphery, which is the final part of this heating and cooling, which causes distortion in the outer periphery. Seem.

Therefore, according to the present invention, since strain can be concentrated on the outermost circumferential portion, for example, the non-recorded portions 40 and 41, which are formed to be larger than the final external shape, the final external dimension is considerably inward from the outermost circumferential portion. In the case of an information recording medium press-molded by the manufacturing apparatus of the present invention, which is provided with a portion corresponding to It is unaffected.

In addition, FIG. 7B shows the state when the cake 21 of FIG. 7A is press-molded. As is clear from this, the overflow portion 45 is the unrecorded portion 4.
4 and a flow section 46. This overflow portion 45 is then edged with a knife 47, which will be described later, in section A of FIG. 7C, and is formed into a final external shape of 10.2 inches (26 cm) as shown in FIG. 7D.

In addition, in the present invention, the position of the overflow part is
Although we have explained the example of installing it on the outside of 12 inches (30 cm), this position can be changed by changing the upper and lower cases.
Of course, it is also possible to provide it outside the 26 cm portion, and in that case, the press cycle can be shortened compared to the above-mentioned one, and at the same time, the material can be saved.

In this way, the information recording medium formed to have an outer shape larger than a predetermined outer shape is then moved to the gripper 35.
Accordingly, it is transferred to the trimming mechanism section which is the second group in the present invention.

Here, the mechanism for transporting the disk in the manufacturing process of the information recording medium will be explained using mainly FIGS. 2C and 2A.

48 is a pressure table suspended from a pressure table cylinder 50 fixed to the main slide 49, and when the pressure table cylinder 50 is operated, the gripper 35 fixed to the main slide 49 is operated. The disk with overflow brought onto the turntable 51 is pressed down from above, and the information recording medium, which has been trimmed into a desired shape by a edging mechanism such as a knife 47 (described later), is conveyed to the next process, a check table (sensor table). It is something to do. Note that 52 is a rail on which the main slide 49 slides, and 53 is a suction cup provided on the pressure table 48.

Reference numeral 54 designates a flow slide which is fixed to the main slide 49 and has a shaft 55 at its tip that is operated by a flow slide air cylinder (not shown).The shaft 55 is pushed by the operation of the flow slide air cylinder, and an overflow edged by a knife 47 is formed. The portion is dropped onto an overflow discharge means.

Note that, of course, the gripper 35 releases the grip when the disk with an overflow is brought to a predetermined position.

Reference numeral 56 denotes a transport arm fixed to the main slide 49, which carries out checks on the disks during the process.
It is transported to the next process, such as the stock section 88. Next, the point of trimming the disk with an overflow brought onto the turntable 51 by the gripper 35 fixed to the main slide 49 and the discharge process of discharging the trimmed portion will be explained using FIG.

FIG. 8A is a vertical sectional side view showing the relationship between the trimming means and the main parts of the ejection means, and FIG. 8B shows the disk with an overflow pressed by the press means in A described above is transferred to a predetermined part of the trimming means by the main slide, As a result, the trimmer pin 60 is raised to hold the disk with overflow, and FIG. The side view D shows a state in which the pressure plate and the flow pusher are activated (lowered) to clamp a disc with an overflow on the turntable, and the clamped overflow portion is trimmed by a cutter blade. Figure E shows a state in which a disk that has been shaped into a desired external shape by a trimming device is held by a disk holding device, and the disk holding device is raised to a predetermined position, the trimming device is lowered to a predetermined position, and the disk is trimmed. A side view showing a state in which the overflow part is placed on the support stand, F shows a state in which the overflow part on the flow table that was trimmed in the previous process is discharged by the discharge case, and a front view after the flow table has returned. It is a side view which shows the state where the overflow part which was mounted on the support stand in E is mounted.

In addition, 58 is a trimmer pin cylinder provided on the lower surface of the turntable 51, 59 is a sub trimmer pin cylinder, 59A is a tip provided at the tip of this sub trimmer pin cylinder, and 60 is provided at the center of the turntable 51. A trimmer pin with a tapered tip.

61 and 62 are air cylinders, 63 and 64 are
This is a shaft connected to this air cylinder.

Reference numeral 65 denotes a mounting table on which a turntable rotation means and the like are placed, and 66 is a ring having a plurality of claws 67 that normally protrude toward the turntable.

68 is a flow table cylinder, and a flow table 69 is connected to this cylinder.

70 is a flow stopper, and 71 is a chute for receiving the falling flow portion.

Reference numeral 57 indicates a check means for checking the completed disk edged by the edger, which includes a check table 73, a check table cylinder 74 and a sub-check table cylinder 75 for moving the check table up and down. It is made up of. In addition,
76 is a pin provided on the check table.

Furthermore, the disks checked by this checking means are transferred to the stock section, but as a preliminary step, a partition plate is placed between a predetermined number of completed disks, and the partition plate The transfer will be explained with reference to FIGS. 9A to 9D.

Fig. 9A is a side view showing the state before operation, Fig. 9B is a side view showing the operating state, Fig. 9C is a side view showing the state in which the suction cup is activated and suctioned one partition plate, and Fig. 9D is a side view showing the suction cup. It is a side view which shows the state made into multiple.

77 is an air cylinder placed on the support base 84, and a suction cup 78 is fixed to the tip thereof. Note that 79 is an air nozzle.

80 is a center shaft fixed to the center of the pallet 82, and a required number of partition plates 81 are placed inside this center shaft.

83 is a rail on which the air cylinder 77 is placed and the support base 84 slides; 85 is a slider cylinder; the tip end 86 of this air cylinder is configured to push the support base 84;

Next, the operation of manufacturing a video disc by the information recording medium manufacturing apparatus of the present invention constructed and installed as described above will be explained with reference to FIGS. 2A to 3D and FIG.

First, after the main power switch is turned on, the extruder motor, which is the driving means of the extruder 1, is rotated, and the screw 3 is rotated, and the material to be molded by this rotation is heated to about 100℃ to 200℃. The mixture is appropriately kneaded in the heated steam flow path 7 to have an appropriate viscosity for use in video discs, and is intermittently extruded from the nozzle opening 6. This intermittently extruded material to be molded flows into a cake cup 12 in which a space 17 is formed for the material to be molded to enter, as shown in FIG.

Since this space has the shape described above, the material to be molded comes into contact with the protrusion, and then gradually moves into the recess 12 of the space, which is the outer periphery of the material.
It expands in the C and 12D directions.

When a predetermined amount is fed, a switch (not shown) provided in the cylinder is activated to stop feeding the material to be molded, and the material to be molded filled in this space 17 is left in this state for a predetermined period of time. .

Then, after a predetermined period of time has elapsed, the filled material to be molded becomes a predetermined molded (preformed) state. This shaped (preformed) cake has approximately the same shape as the space 17 inside the cake cup.

Here, to explain in detail the requirements for the cake, firstly, the outer periphery must be a smooth surface with no protrusions, secondly, there must be no temperature unevenness around the circumference, and thirdly, there must be no small depressions. It is required that there be no voids or voids. Incidentally, the cake cups conventionally used have a generally cylindrical shape having a flat top surface and a bottom surface that completely extend to the peripheral surface. This type of cake cup is difficult to shape into a cake without protrusions on the outer periphery.
In addition, it is difficult to form a cake with uniform temperature around the circumference, and there is also the disadvantage that small depressions and voids are easily formed in the cake. As a result, air and gas are trapped in the protrusions, recesses, and voids between the flat surface of the cake and the press case. The trapped air or gas cannot escape when the press case is closed and is forced against the cake side, forming defects such as voids, bulges, and depressions on the disk surface. Such a defect may cause, for example, a misalignment in the molding of the pit, making it impossible for the needle to track correctly. Such defects are a very big problem, especially when the number of information pits is 1 as mentioned above.
There are 50 billion pits on a single disc, which is extremely undesirable for high-density video discs.

In addition, since conventional cake cups are simply cylindrical, there is temperature unevenness around the circumference between the part that is fed first and hardens first, and the part that is fed last and hardens last, so it is not press-formed. In some cases, the elongation is different and the thickness is not uniform, and the outer periphery is distorted. Such a defect of distortion on the outer periphery is fatal for a video disc in which video information is recorded from the outer periphery to the inner periphery, and is completely unacceptable.

According to the cake cup according to the present invention, FIG.
As is clearer, the shape is approximately circular, and the through hole 21D is provided in the center, and the outer diameter of the flat part on the lower side of the cake is made smaller than the diameter of the innermost circumference of the signal groove of the disk. The other portions are formed into circular convex portions.

Therefore, even when the cake formed using the cake cup according to the present invention is brought onto the press 35 and press-formed, the convex portions 21B, 21
Since C is provided, air is not drawn in during molding, and bulges due to air bubbles do not occur on the disk surface.

When the cake is shaped (preformed) into a predetermined shape using the cake cup, the upper cylinder 1
5, the upper cup 12A is moved upward to a predetermined position. This upward movement activates the switch, and the air cylinder 19 slides from FIG. 4C to the right as shown in FIG. 4D. As a result, the movable cup 13 with a predetermined cake placed thereon is brought onto the press 22.

When the movable cup 13 is brought onto the press machine 22, the upper frame 31 and the upper center pin 33 which also serves as a guide in the movable frame 30 are projected.
The cake in this movable cup 13 is inserted from above to hold the cake. When the cake is held by the upper center pin and the through hole 34, the switch is actuated, and the movable cup 19 returns to its original position. Thereafter, the hydraulic cylinder 26 is moved upward by actuation of the switch, and the cake held by the upper pin and the through hole is press-molded using the upper and lower molds that have been heated in advance. The molding time is about 20 seconds of heating and pressing after pressing, followed by about 10 seconds of cooling.

Then, as mentioned above, the upper and lower cases 23 and 24
each has grooves for heating and cooling inside thereof, and the grooves are provided at least to the outside of the portion where the medium portion continuous with the final outer diameter of the disk is formed. Due to its nature, a press-molded disk is formed into a shape that is considerably larger than its final external shape, and furthermore, the outermost portions, for example, the cutout portions 42, 4,
3 has an overflow that concentrates distortion.

Therefore, in the case of an information recording medium press-molded by the manufacturing apparatus of the present invention in which a portion corresponding to the final external dimension is provided considerably inward from this outermost periphery, The effect of distortion is not transmitted, and the cutout portions 42 and 43 are edged by trimming means, so there is no problem.

When a predetermined press cycle is completed, the hydraulic cylinder 26 descends, and as the hydraulic cylinder 26 descends, a limit switch (not shown) is activated, thereby moving the main slide 49 in a predetermined direction. and,
This movement of the main slide 49 activates a separate limit switch, which causes the trimmer pin cylinder 5 to receive the overflow disk.
8. The sub trimmer pin cylinder 59, check table cylinder 74, and sub check table cylinder 75 all rise. When the gripper 35 fixed on the main slide 49 is operated, the fingers (not shown) of the disk with an overflow are closed to grip the disk with an overflow.

The fingers of the gripper are configured to close during the press molding cycle shortly before the end of cooling.

Then, the main slide 49 moves forward (Fig. 2A
(the direction of the middle arrow is the forward direction), the disk with the overflow is transferred to a edging mechanism such as a knife 47, which is the next step. As the main slide 49 moves, the cake cup 12 containing the next cake is moved to the press 22.
brought to the top.

At the bottom of the edging mechanism section consisting of the knife 47 and the like, there is a disk with an overflow gripped by the gripper 35 of the main slide 49 as described above, when the main slide 49 is moved to this position (edging mechanism section). Since the trimmer pin cylinder 58 and the sub-trimmer pin cylinder 59 are provided, which move upward together when the timer is activated, the trimmer pin 60 is brought to the highest position by moving the main slide 49 to a predetermined position. Ru. When the trimmer pin 60 is brought to the highest position, the gripper 35
Release the grip on the disk with overflow,
The disk with the overflow is moved down along the trimmer pin 60 and placed on the turntable 51. (Fig. 8B) (Fig. 8C) When a disk with an overflow is placed on the turntable 51 and the main slide 49 returns in the direction opposite to the arrow, a limit switch (not shown) attached to the frame 52 is activated. As a result of this operation, the sub trimmer pin cylinder 59 is lowered by one step, and this lowering lowers the trimmer pin 60 and closes the fingers of the gripper 35 to facilitate the return of the main slide 49.

Note that with the return of the main slide 49, the gripper 35 is moved again to the upper frame 31 and the moving frame 3.
Return to 0 and prepare to grasp the next overflow disk.

When the main slide 49 returns, the pressure plate cylinder 50 operates, and the pressure table 48 has a suction cup 53 attached to its tip.
descends to the position of the overflowing disc, and this disc is sucked by the suction cup 53, and is pressed onto the turntable 51. (Fig. 8D) By the time the pressure table 48 begins to descend and reaches the overflow disk position on the turntable 51, the turntable 51 has been rotated by a known rotation means. It is. When the pressure table 48 descends to a position where it presses the disk with an overflow, the turntable 51 moves downward a little, so that the overflow portion comes into contact with the knife 47 and edge cutting begins. At this time, the shaft 55 is
This flow portion is pressed downward so that the overflow portion immediately after being cut does not go above the upper surface of the turntable 51.

The disk with overflow is knife 47
It is trimmed to the required external shape by the trimming mechanism section, and the next disk with an overflow is press-formed by the press machine 22, and the hydraulic cylinder 26 is lowered, and the switch is activated as the hydraulic cylinder lowers. Then, the air cylinder for the float shear becomes inactive, and the shaft 55
returns to its original position.

That is, the above-mentioned edging is completed by the time the press molding cycle on the press machine 22 is completed.

Of course, at this time, the next cake brought onto the press 22 by the cake cup as described above is being subjected to predetermined press forming there.

On the other hand, the trimmed overflow portion is located slightly below the top surface of the turntable 51, and is located at a claw portion 67 that is slidably provided on the ring 66.
will be placed on.

When the disc, which has been sucked by the suction cup 53 and trimmed to a predetermined external dimension, rises and returns to the predetermined position, a switch (not shown) is activated, which activates the air cylinders 61 and 62, and the shaft connected thereto. 63 and 64 descend.

As the shafts 63 and 64 descend, the mounting table 65 on which the turntable 51, turntable rotation means, etc. are mounted also descends to a position below the flow table 69, which will be described later. When the turntable 51 and the like are lowered to a predetermined position, a switch (not shown) is activated, which activates the flow table cylinder 68, causing the flow table 69 connected thereto to engage the pawl 67 on which the flow portion is placed and the turntable. It gets between it and the table 51. When the flow table 69 enters between the claw 67 and the turntable 51, the claw 67, which is connected to a mechanism not shown in the ring 66 and is normally locked at the positions shown in FIGS. It is released and stored in the ring 66.

Therefore, the flow portion resting on the claw 67 falls onto the flow table 69. (FIG. 8F) When the cut flow portion falls onto the flow table 69, a switch (not shown) is activated, which activates the flow table cylinder 68, and the flow table 69 connected thereto is moved to the flow portion. Return to the original position (E position in Fig. 8) with the item still placed on it.

When the flow table 69 returns to its original position, a switch (not shown) is activated, which causes the flow stopper 70 to move downward (in the direction of the arrow in FIG. 8F) and intersect with a notch (not shown) provided in the flow table 69. Get into it like you do. As a result, the flow part is controlled by this flow stopper 70.
It is stopped on the flow table 69 by the following steps.

Therefore, when the flow table 69 moves to a predetermined position above the turntable 51 to collect the next flow part, this flow part is prevented from advancing by the flow stopper 70 and falls into the chute 71. .

Since the chute 71 is inclined, the flow portion dropped onto the chute 71 falls freely on the chute 71 and is discharged and collected outside the apparatus. Note that this discharge and recovery is performed while the edging process and predetermined press forming are being performed.

On the other hand, when the flow table 69 returns to its original position, a switch (not shown) is activated, which causes the turntable cylinder 58 to operate again and the turntable 51 to rise and return to the position A in FIG.

When the predetermined press molding is completed and a disk with an overflow is formed, the disk with an overflow is gripped by the fingers of the gripper 35 on the main slide 49 by the same operation as described above. By advancing, it is transferred to a edging mechanism such as a knife 47. That is, at this time, the main slide 49
Above, the first disc which has already been trimmed and the next disc which has been pressed are held by the pressure table and gripper 35, respectively.

Therefore, the first disk being trimmed by the movement of the main slide 49 is moved to the next check table section (sensor table section 57).
Further, the next disk having an overflow portion is conveyed to a respective predetermined position of a edging mechanism such as a knife 47. However, when the trimmed first disk is brought to point Z by moving the main slide 49 in the direction of the arrow in FIG. The hold table cylinder 74, trimmer pin cylinder 58, and sub trimmer cylinder 59 each rise on the lower surface of the first disk and the next disk with overflow, and accordingly, the trimmer pin 60 and check table 73 rise, The first disk and the next disk with overflow are lowered along trimmer pins 60 and 76, respectively, and are prepared to be placed on their respective tables.

Incidentally, the disk with an overflow brought to the edging mechanism section such as the knife 47 is trimmed in the same manner as described above, and is sucked to the suction cup 53 of the pressure table 48, and is placed on standby for the next process.

On the other hand, when the first disk trimmed into the desired shape is brought onto the check table 73, the suction cup 53 of the pressure table 48 is deactivated and the disk is placed on the check table 73. . At this time, the main slide 49 is of course returned to its original position. Note that when the main slide returns, the check table 7
3 has been lowered, and the sub trimmer pin cylinder 59 has been lowered by one step, so the main slide easily returns to its original position. The main slide 49 also includes the gripper 35 as described above.
Pressure table 48, flow pressure 5
4. A transport arm 49 is provided, and the grippers 35 of the transport arm 56 are mounted on the main slide 49 at equal intervals at points X, Y, Z, and W in the figure.

When a disk is placed on the check table 73, only the check table cylinder 74 is lowered, that is, the check table 73 is lowered one step, and a check means (not shown) performs a process check on the disk.

When the disk has been checked by the checking means, the sub-check cylinder is operated again and the check table 73 is raised to a position directly below the suction cup 87 provided at the tip 86 of the transfer arm 49.

Thereafter, a timer (not shown) is activated in response to this upward movement, and the suction cup 87 provided at the tip 86 of the transfer arm acts to suction the disk D on the check table 73, leading to the next process. The storage unit 88 is then placed on standby.

When the disk is suctioned by the suction cup 87, a timer is activated and both the check table cylinder 74 and the sub-check table cylinder 75 are lowered (two steps) to facilitate sliding of the main slide 49 to the next process. . In addition, this check process is
Of course, the process ends within the press molding cycle of the press machine 22. Similarly, the next disk of the desired shape that has been trimmed by the edging mechanism such as the knife 47 is also trimmed by the pressure table 4.
Of course, it is also attracted to the suction cup 53 of No. 8 and is waiting for the next process.

In this way, when the first disk and the second disk, which is the next disk, have finished the checking process and the edging process and are waiting for the next process, the third disk is released from the press machine 22. It is press-molded and gripped by grippers 35 in the same manner as above. When the limit switch is activated as the hydraulic cylinder 26 is lowered, the main slide 49 moves forward. As a result, the first disk is brought to point W in FIG. 2A, the second disk to point Z, and the third disk to point Y. Note that the respective operations at point Y and point Z are the same as described above, so they will not be described here.

When the main slide 49 moves forward due to the actuation of the limit switch as the hydraulic cylinder 26 descends and brings the first disk to point W in FIG. The suction of the suction cup 87 on the tip portion 86 is released. When the suction of the suction cup 87 is released, the first disk falls naturally and is placed on the disk receiving pallet 89 at point W. When the first disk released from suction is placed on the disk receiver 89, a switch (not shown) is activated and the main slide 49 returns to the predetermined position shown in FIG. wait.

When a predetermined number of completed disks (5 disks) are placed on the disk receiving pallet 89, a limit switch (not shown) is activated, which activates the air cylinder 77, and the suction cup 78 is moved from the position A in FIG. Descend to position B.

Incidentally, when the air cylinder 77 is operated, the suction cup 78 is communicated with a vacuum mechanism (not shown).

The suction cup 78 descends to position B in FIG. 9 and the partition plate 8
1, this suction cup 78 attracts this partition plate 81 because it communicates with the vacuum mechanism as described above. When the suction cup 78 attracts the partition plate 81, a limit switch (not shown) is activated, and the air cylinder 77 is returned to its original position (FIG. 9A).
Return to position direction. (Fig. 9C) When this suction cup 78 suctions the partition plate 81, the number of partition plates 81 is more than the required number (1 piece), for example, 2 pieces.
In order to prevent the sheets from being attracted, air is blown out from the air nozzle 79 onto the upper part of the partition plate 81 placed on the partition plate 81 at the same time as the sheet is being attracted.

Further, in the state shown in FIG. 9C, it goes without saying that the structure is such that air does not blow out.

In this way, when the suction cup 78 attracts the partition plate 81 and returns to the position C in FIG. 9, a limit switch (not shown) is activated, and thereby the slider cylinder 85 is activated. This slider cylinder 85
The tip portion 85A is connected to this by the operation of
moves forward, and this tip portion 85A pushes the support base 84 to move the support base 84 to a predetermined position, as shown in FIG. 2A.
The discs are transferred to a position above a disc tray (pallet) on which five completed discs are placed.

When the support stand 84 having the suction cup 78 that has sucked the partition plate 81 is transferred to the disk receiving position, a limit switch (not shown) is activated and the upper and lower cylinders 77 are moved down to a predetermined position near the shaft (not shown) on the pallet 89. . Upper and lower cylinder 77
When the partition plate 81 moves down to a predetermined position, a switch (not shown) is operated to release the suction cup 78, and as a result, the partition plate 81 that was suctioned thereto falls onto the completed fifth disk. At the same time, the slider cylinder 85 is deactivated and the support base 84 returns to its original position, ie, the position A in FIG. 2. The movement of the partition plate placed on the completed fifth disk is performed in accordance with the press cycle.

In this way, disk D is placed on palette 89.
When 50 sheets are placed, a relay (not shown) is activated to lower the pallet table 90 holding the pallet 89. This lowering activates a switch, which activates a pallet pusher (not shown). The pallet table 90 is pushed out by the operation, and this pallet table slides along a tilted table (not shown) and is stored in a predetermined stocker section.

As described above, according to the information recording medium manufacturing apparatus of the present invention, extremely high-density information recording media can be produced efficiently and in large quantities.

It should be noted that the above is merely a basic example of the present invention, and the present invention is not limited to the above-described example, and various changes may be made within the scope of the claims of the present invention. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a system diagram for explaining the information recording medium manufacturing apparatus according to the present invention, and FIGS. 2A, B, and C are plan, front, and side views of the main parts of the manufacturing apparatus, respectively. Figure 3 is a sectional view of the nozzle part of the extrusion mechanism, Figure 4A is a side view of the front staircase that makes up the cake cup, Figure 4B is a side view showing the part that makes up the cake cup has been moved to a predetermined position, and Figure 4C is a side view of the nozzle part of the extrusion mechanism.
is a side view showing the preformed product placed on the moving cup, D is a side view showing the preform moved onto the case (mold) surface, and E is the side view showing the preformed product placed on the moving cup. FIG. 5 is an enlarged side view showing the state in which a predetermined cake cup has been formed, FIG. 6A is a front view of the press, and FIG. Partially enlarged front view showing the state in which the cake has been transported to the position, C is an enlarged front view showing the arrangement of the center pin and cake, and D is an enlarged front view showing the state in which the lower mold has moved upward and the cake has been pressed. Figure 7E is a front view showing the center pin and lower die having returned to their original positions, and Figures 7A, B, C, and D are longitudinal side views of the press case and the state in which the press case is used. FIG. 8A is a longitudinal sectional side view showing the relationship between the edging means and the main parts of the ejecting means;
FIGS. 9B to 9F are explanatory diagrams showing a part of the edging process and the discharge process, respectively, for edging the overflow part, and FIGS. 9A to 9D are explanatory diagrams showing the relationship between the partition plate and its transfer means. 1... Extrusion mechanism, 12... Cake cup, 2
2...press machine, 35...gripper, 49...main slide, 60...trimmer pin.

Claims (1)

[Claims] 1. An information recording medium manufacturing apparatus that manufactures high-density information recording media using conductive resin, which comprises extrusion means for extruding material to be molded for one information recording medium, and an extrusion direction of this extrusion means. Information recording medium preforming means provided in the same direction and forming a molded part having a predetermined shape with a through hole in the center from the material to be molded supplied by the extrusion means; a transfer means for transferring the preformed part; a press means provided parallel to the extrusion means for pressing the preformed part brought between the press cases by the transfer means; A conveyance means for conveying an information recording medium onto a turntable, an edging means for edging the information recording medium with an overflow conveyed onto the turntable into a predetermined shape, and an overflow portion edged by the edging means is discharged. 1. An information recording medium manufacturing apparatus comprising: an ejection means.