JPH02258227A - Mold for molding disc - Google Patents

Abstract

PURPOSE:To exchange stampers in a very short time by a method wherein a gap is provided between a holding pin and an engaging hole part, both of which are not engaged each other and an outer peripheral stamper presser is elastically energized across the gap when a mold is in open state and, at the same time, the outer peripheral stamper presser is held on a mold side, on the mold of which no stamper is held. CONSTITUTION:By opening a mold, an outer peripheral stamper presser 30 is transferred to a fixed mold 2 side. After that, the stepped part 91A of the outer peripheral stamper presser 30 is pressed against a gap (delta) by energizing springs 101 through copper balls 100 so as to be brought into an abutting and engaging state with the stepped part of the head 80A of a fixed holding pin 80, resulting in laying the outer peripheral stamper presser 30 on the fixed mold 2. The inner peripheral stamper presser 15 of a movable mold 4 is disassembled in order to disassemble a stamper 14. A new stamper is mounted by means of the inner peripheral stamper presser 15 and, after that, the mold is closed. By depressing a bar-like member 40 so far until a handle 40A abuts against a holding-up part 4B, the outer peripheral stamper presser 30 is transferred again to the movable mold 4 side so as to hold the outer peripheral part of the stamper. A copper ball 60, which is energized by a spring 61, fits in the concave part 40E of the bar-like member 40, resulting in locking the outer peripheral stamper presser 30 motionless.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a mold for an injection molding machine, and more specifically, it is used for injection molding of video discs, audio discs, or memory discs (hereinafter referred to as discs, etc.). The present invention relates to a support means for a stamper for forming a signal on a mold.

(Prior art) Prior art for injection molding molds for video discs, etc. include Japanese Patent Publication No. 58-58214 and Japanese Patent Application Laid-open No. 59-2307.
There is an invention disclosed in No. 31.

In all of the mold structures disclosed in these inventions, stamper holders for fixing the stamper to the bottom surface of the mold cavity are fixed to the inner and outer peripheries of the mold with screws or the like.

(Problem M to be Solved by the Invention) When molding compact discs, there are factories that are required to mold many types of discs in one day, and the stamper is replaced on average five to six times a day.

To replace the stamper, it is necessary to remove the inner stamper holder and the outer stamper holder, and then install them.In this case, the work time required for installation and removal is also an issue from a productivity standpoint, but in addition, the outer stamper holder must be removed. If the outer circumferential stamper holder comes into contact with the cavity surface during installation or removal and causes scratches, the mold cannot be used due to the need for precision molding of the disk.

(Means for Solving the Problems) In order to solve such problems, the present invention provides a plurality of holding pins at a predetermined position of one mold and a predetermined position of the other mold, and a plurality of holding pins are provided respectively in a predetermined position of one mold and the other mold, and a plurality of holding pins are provided respectively in a predetermined position of one mold and the other mold. When the mold is engaged with the plurality of holding pins of the one mold and is held by one of the molds, it is disengaged from the plurality of holding pins of the other mold and engaged with the plurality of holding pins of the other mold. A predetermined number of engagement holes are provided in the outer peripheral stamper holder to disengage the plurality of holding pins of one mold when the plurality of holding pins of the one mold or the plurality of holding pins of the other mold are in a possible state. Rotating means for the outer circumferential stamper holder is provided for selectively selecting engagement with a plurality of holding pins, and a rotating means for the outer periphery stamper holder is provided between the holding pin that is not in the engaged state and the engagement hole portion. A gap δ is provided to easily allow the outer stamper holder to be elastically biased across the gap δ when the outer periphery stamper holder is held on the other side of the mold where there is no stamper while the mold is open. We have provided means.

(Example) In order to specifically clarify the present invention, examples will be described below in detail based on the drawings.

1 is a stationary plate of an injection molding machine, and 2 is a stationary mold fixed to the stationary plate 1. 3 is a movable platen, and 4 is a movable mold fixed to the movable platen 3. The movable platen 3 is fixed by the action of a ram 5 inserted into a mold clamping cylinder (not shown).
6 is a heating cylinder into which an injection screw is rotatably and reciprocatably inserted, and 7 is a nozzle provided at the tip of the heating cylinder 6, which performs mold closing, pressing, and mold opening operations for W1. .

First, the movable mold will be explained based mainly on FIGS. 2 and 4. 10 is a tapered convex portion provided from the end surface of the body portion 4A of the movable mold. 11 is the body part 4A of the movable mold
This is an annular recess formed concentrically with the tapered convex portion 10 from the end face of the taper convex portion 10 . The annular recess 11 includes a pack plate 12,
The mirror plate 13 is inserted without any play. A stamper 14 is fixed to the mirror plate 13 around the center opening by an inner stamper holder 15. Stamper foot 1
An ejector sleeve 16 and a punch 17 for opening the center of the molded disk are inserted into the inner hole 5 so that they can reciprocate independently. Reference numeral 20 designates movable side holding pins, which are provided at four locations in this embodiment as shown in FIG. The head portion 2OA and bottom portion 20C of the movable holding pin 20 have a radius larger than that of the leg portions 20B, and each form a stepped portion. The movable side holding pin 20 has the shape of a round pin divided approximately in half lengthwise and is provided in contact with the wall surface of the annular recess 11, and is attached to the holding portion 1 formed on the mirror plate 13.
3A, the bottom part 20C and leg part 2 of the movable side holding pin 20
After holding a part of 0B, the mirror plate 1st is fixed at a predetermined position, thereby being positioned and fixed. 3
Reference numeral 0 denotes an outer circumference stamper retainer that holds the outer circumference of the stamper 14 when it is engaged with the movable side holding pin 20. Reference numeral 31 denotes an engagement hole provided on the outer periphery of the outer stamper holder 30. As shown in particular detail in FIGS. 7 and 8, the engagement hole 31 has a stepped portion 31A from the surface side of the paper.
The stepped portion 31A has a small radius portion 31B at one end.
, the other end is a large rounded portion 31C, and a notch is formed that connects them almost straight in the middle. The small a part 31B
The radius of the movable holding pin 20 is slightly larger than the radius of the leg portion 20B, and the radius of the approximate portion 31C is larger than the radius of the head portion 2OA.

Further, the space extending from the surface side of the retaining hole portion 31 in the plane of the drawing to the stepped portion 31A is formed in a shape that does not interfere with the outer periphery of the head 2OA of the movable side holding pin 20. That is, as shown in FIG. 2, the stepped portions 31A of the engagement holes 31 provided at four locations on the outer peripheral stamper holder 30 corresponding to the four locations of the movable-side holding pins 20 fixedly provided on the movable-side mold 4 are small. When in engagement with the stepped portion of the head 2OA of the movable side holding pin 20 in the vicinity of the R section 31B, the outer stamper presser 30 is not allowed to move toward the surface of the page, but rotates clockwise on the page. When the movable holding pin 20 is rotated and disengaged from the head 2OA of the movable holding pin 20 in the vicinity of the general portion 31C, it can freely move toward the surface of the page.

Next, a configuration for rotating the outer stamper holder 30 will be explained.

40 is a rod-shaped member, which includes a round rod-shaped handle portion 40A;
It consists of a square bar-shaped guide part 40B following the handle part 4OA and a stopper part 40C at the end. When the step surface at the boundary between the round bar-shaped handle part 40A and the square bar-shaped guide part 40B is in contact with the contact part 4B provided on the body part 4A of the movable mold 4 as shown in FIG. A stopper portion 4 is located at a predetermined distance from the other contact portion 4C provided.
0C is located. The guide portion 40B of the rod-shaped member 40 can slide freely in a guide groove 50 provided through the body portion 4A of the movable mold 4 and the mirror plate 13 without any play. As shown in an enlarged view in FIG. 9, the guide groove 50 in the mirror plate 13 is
It is a three-sided groove opening toward the 0 side, and its depth is the same as the thickness of the rectangular bar-shaped guide portion 40B.

40D is a round bar-shaped projection fixed to the guide portion 40. 30A is a mirror plate 13II of the outer stamper holder 30 facing toward the center of the outer periphery stamper holder 30.
This is a slit cut at the bottom of the J, and its width is such that it engages with the outer diameter of the protrusion 40D with almost no play, and its depth is deeper than the height of the protrusion 40D. The guide portion 40B of the rod-shaped member 40 is further provided with two spherical recesses 40.
E and 40F are provided a predetermined distance apart. Reference numeral 60 has a steel ball holder, and 61 shows the steel ball 60 being held in the guide portion 40 of the rod-shaped member 40.
A spring 62 for biasing toward B is a stopper for the spring 61, and is provided inside the body 4A of the movable mold 4, so that the steel ball 60 is connected to the spherical recess 40E or 40F. It is possible to engage.

Next, the stationary mold will be explained based on FIG. 6, which shows a state in which the outer stamper holder 30 has been moved from the movable mold 4 to the fixed mold 2. Reference numeral 70 denotes a tapered recess provided from the end surface of the body portion 2A of the stationary mold 2, which has the same taper as the tapered convex portion 10 of the movable mold 4, and allows the taper convex portion 10 to be inserted while being centered. ing. 71 is a tapered recess 70
Next is an annular recess formed to have the same diameter as the annular recess 11 of the movable mold 4, into which the pack plate 72 and mirror plate 73 are fitted without any play. 74 is Sprubutush. 80 is a fixed side holding pin corresponding to the movable side holding pin 20 of the movable side mold 4! Therefore, in this embodiment, there are provided two locations (the locations are shown in FIG. 3). 80A is the head of the fixed side holding pin 80, 80B is the leg, and 80C is the bottom. Reference numeral 73A denotes holding portions formed on the mirror plate 73, which are provided at two locations. Figure 2, especially the 7th
As shown in detail in the drawings and FIG. 8, 91 is an engagement hole provided at two locations in the outer stamper holder 30, 91A is a stepped portion of the engagement hole 91, 91B is a small R portion, and 91C is an engagement hole. This is the general part. As shown in FIG. 2, the engagement hole 91 is formed upside down from the engagement hole 31 already described in detail, and the movable side holding pin 20 and the engagement hole 31 are formed in the movable mold 4. does not interfere with the fixed-side holding pin 80 of the fixed-side mold 2 when the movable-side holding pin 20 and the engagement hole 3 are in the engaged state.
1 is disengaged from the fixed side mold 2, and the shapes of the fixed side holding pin 80 and the engagement hole 91 are in accordance with the contents described in the head and the movable side mold 2. Therefore, the explanation is omitted here. However, when holding the outer stamper holder 30 on the stationary mold 2 in the mold open state, the stepped part of the engagement hole 91 of the outer stamper holder 30 is attached to the stepped part of the head 80A of the stationary side holding pin 80. 91A is engaged while being pressed by the biasing force of the spring 101. That is, the outer stamper holder 30 is attached to the movable mold 4
When the mold is closed while being held in place, the head 20 of the movable side holding pin 20 of the movable side mold 4 is
The stepped portion of A and the stepped portion 31A of the engagement hole 31 of the outer stand bar presser 30 are in an engaged state, but the stepped portion of the head 80A of the fixed-side holding pin 80 of the fixed-side mold 2 and A gap δ is provided between the outer stamper holder 30 and the stepped portion 91A of the engagement hole 91 in order to facilitate movement when the outer periphery stamper holder 30 is rotated and transferred to the stationary mold 2. When the outer stamper holder 30 is moved to the fixed side and the mold is opened, the spring 101 biases the gap δ. Reference numeral 100 denotes a steel ball that comes into contact with the surface of the outer stamper holder 30 on the fixed platen 1 side while being biased by a spring 101. In this embodiment, the steel balls are provided at four locations (the positions are shown in FIG. 3). There is. Of course the steel ball 100
is a mirror play so that the outer stamper holder 30 does not come off and fly out even when it is not on the fixed side mold 2)
It is provided in 7311.

Next, the operation will be explained.

The state shown in FIG. 4 is the mirror plate 13 of the movable mold 4.
The stamper 14 is held on the surface by an inner stamper holder 15 and an outer stamper holder 30. The movable platen 3 is moved forward by the ram 5, and the movable mold 4 and the fixed mold 2 are closed and clamped, resulting in the cavity 200 in the state shown in FIG.
is formed.

At the same time, a nozzle touch is performed, and a screw (not shown) inserted into the heating part 6 moves forward to inject raw resin from the nozzle 7 into the cavity 200 to form a disk.
Open the mold and take out the molded product.

When a predetermined number of disks have been molded and the stamper 14 is to be replaced, the mold is closed again as shown in FIG. Pull the handle portion 40A of the rod-shaped member 40 until the stopper portion 40C abuts against the abutting portion 4C. Outer stamper holder 30
Since the slit 30A and the outer periphery of the protrusion 40D of the bar member 40 are engaged, the outer stamper holder 30 rotates clockwise in FIG.

The steel ball 60 biased by the spring 61 fits into the spherical recess 40F provided in the guide portion 40B of the rod-shaped member 40, and the rod-shaped member 40 is locked so that it does not move. The stepped part of the head 20A of the movable holding pin 20 of the movable mold 4 is disengaged from the stepped part 31A of the engagement hole 31 of the outer stamper holder 30, and the fixed mold 2 is held on the fixed side. Head 80 of pin 80
The stepped portion A and the stepped portion 91A of the engagement hole 91 of the outer stamper holder 30 are in an engageable state. When the mold is opened, the sixth
As shown in the figure, the outer stamper holder 80 has been moved to the stationary mold 2 side, and the outer stamper holder is pressed by a spring 101 through a steel ball 100 to fill the gap δ provided to facilitate movement. The stepped portion 91A of the fixed side holding pin 80 is pressed and brought into contact and engagement with the stepped portion of the head 80A of the fixed side holding pin 80, and the outer stamper holder 30 is held by the fixed side mold 2.

Remove the inner peripheral stamper holder 15 of the movable mold 4 and remove the stamper 1.
To attach a new stamper using the inner stamper holder 15, close the mold and push the bar member 40 until the handle 40A abuts the contact part 4B, and the outer stamper holder 30 is moved to the movable mold 4 side again. Hold the outer periphery of the new stamper.

The copper ball 60 biased by the spring 61 fits into the spherical recess 40E of the rod-shaped member 40 and locks the rod-shaped member and thus the outer stamper holder 30 so that it does not move.

(Effect) In this way, the outer stamper holder 30 remains concentric,
Since the stamper can be transferred without manual intervention, the stamper 14 and the mirror surface are not scratched by the outer stamper holder 30, and the stamper can be replaced in a much shorter time than in the past.

[Brief explanation of drawings]

FIG. 1 is a front view for explaining one embodiment of the present invention, and FIG. 2 is a view taken along arrows II-II in FIG.
The figure is a view taken in the direction of the lll-1■ arrow in FIG. Figure 4 is a partial cross section (the movable side is the cross section taken along arrow A-A in Figure 2)
FIG. 5 is an enlarged view of FIG. 1 including FIG. 1, and FIG. 5 is a view showing a different operating state of FIG. FIG. 6 is a diagram showing a state in which the outer stamper holder has been moved to the fixed mold side, taken along the line B--B in FIG. 3 (in this figure, the outer periphery stamper holder is not on the fixed mold side). FIG. 7 and FIG. 8, which is a view taken from the ■-■ arrow in FIG. It is a diagram. 1: Fixed plate 2: Fixed side mold 3: Movable plate
4: Movable side mold 4B = contact part
4C: Abutment part 13: Mirror brake) 13A: Holding part 14 Stamper 15: Inner circumference stamper holder 20: Movable side holding pin 20A Two-headed part 20B: Leg part 20C: Bottom part 30: Outer periphery stamper holder 30A Nishiri slit 31A: Step part 31C Two general parts 40A: Handle part 40C: Stopper part 40E: Spherical recessed part 50 Guide groove 31: Engagement hole part 31B: Small R part 40: Rod test member 408 Guide part 40D = Projection part 40F: Spherical recessed part 60: Steel ball 61 Spring 73: Mirror plate 80: Fixed side holding pin 80B: Leg portion 91: Engagement hole portion 91B: Small R portion 100: Steel Ball 200: Cavity

Claims (1)

[Claims] A mold for forming a disk by holding the center of the stamper on the bottom of the cavity of one mold with an inner stamper holder, and holding the outer periphery with an outer stamper holder, and clamping the stamper with the other mold. A plurality of holding pins are provided at a predetermined position of one mold and a predetermined position of the other mold, respectively,
When the mold is held in one mold by engaging with the plurality of holding pins of the one mold in the closed state, the plurality of holding pins of the other mold are disengaged and the plurality of holding pins of the other mold are disengaged. The outer stamper holder is provided with a predetermined number of engagement holes that disengage the plurality of holding pins of one of the molds when the plurality of holding pins of the one mold or the plurality of holding pins of the one mold or Rotating means for the outer circumference stamper holder is provided for selectively selecting engagement with the plurality of holding pins of the other mold, and the outer circumferential stamper holder is provided between the holding pins that are not in the engaged state and the engagement hole. A gap δ is provided to easily allow rotation of the stamper holder, and when the outer stamper holder is held on the other side of the mold with the mold open and there is no stamper, the outer periphery stamper holder is moved across the gap δ. A disk molding die characterized in that it is provided with means for elastically biasing.