JPH01291915A - Ejecting device for injection molding die and its ejecting method - Google Patents

Abstract

PURPOSE:To carry out ejection and returning of a molded product in the given way even when there is pressure variation of an elastic material or unevenness of molded product molding conditions in a cavity by providing independent ejection means in each of a plurality of cavities. CONSTITUTION:Ejection means 34 are provided in each of two cavities 3, and the structure of said ejection means 34 is identical and constituted independently. Ejection is carried out by the movement of inserts 11 for molding product. It is not necessary to provide sections to which ejector components such as ejector pins or the like is set on the peripheral end of a lens, and ejection can be carried out while the molded product is prevented from getting damaged. As the following injection molding work is started after all the returnings of all the ejection means 34 are confirmed by respective sensing means 65, the ejection means 34 are prevented from getting damaged because of the defective returning of the ejections means 34 when mold clamping is carried out for starting injection molding work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an eject device provided in an injection mold and an eject method thereof.

[Conventional technology]

A cavity is provided inside the injection mold, and the molded product formed in this cavity is ejected by an ejector after the mold is divided. In an injection mold having a plurality of cavities, an ejecting means is disposed in each cavity.For example, in a mold for lens molding, etc., pressing of the ejecting means for ejecting the molded product, An elastic body (spring, etc.) returns to the previous position after being pressed.
energizing and restoring effects are utilized.

Furthermore, JP-A-57-187223 discloses that as an ejecting means, an ejector pin and a contact portion against which the ejector pin is applied are integrally formed on the peripheral end of a plastic lens that is an injection molded product. .

[Problem to be solved by the invention]

However, in an injection mold equipped with multiple eject means, for example, when all the eject means are combined and integrated, and these eject means are operated all at once to eject the molded product from each cavity. , pressure fluctuations occur in the individual elastic bodies themselves acting on the ejecting means, and furthermore, the pressure distribution acting on the individually disposed elastic bodies is not constant due to variations in the molding conditions of the molded product in the cavity, etc. There is a problem that the force applied to each ejecting means cannot be equalized, and furthermore, because of this, the ejection force cannot be applied to the center of the molded product, and in that case, the ejection force may enter the gap between the mold components during ejection. A problem arises in that the resin cannot be separated reliably.

Furthermore, the plastic lens shown in the above-mentioned Japanese Patent Application Laid-Open No. 57-187223, which is molded with a contact part of the extrusion pin provided at the peripheral end, requires secondary processing to remove the contact part after molding. The problem arises that the structure of the mold insert becomes complicated.

The present invention has been made to solve such problems, and an object of the present invention is to enable the eject means provided in each cavity to operate as expected, and to eject and extrude a molded product from the cavity. An object of the present invention is to provide an ejecting device for an injection mold in which the subsequent return of the ejecting means is performed in a predetermined manner. Another object of the present invention is to provide a method for ejecting a mold for injection molding, which makes it possible to eject a molded product without providing an abutting portion for applying an ejection pin to the end of the molded product.

[Means to solve the problem]

For this reason, the injection mold eject device according to the present invention has a plurality of cavities formed inside and at least two cavities.
The injection mold can be divided into two parts, and the injection mold is characterized in that each of the plurality of cavities is independently provided with an ejecting means.

Further, this injection mold ejecting device includes a detection means for detecting return of the ejecting means, and this detection means is provided for each ejecting means.

The method for ejecting an injection mold according to the present invention is to mold a molded product in a cavity inside the mold, then divide the mold, and insert the molding insert of the molded product in a direction perpendicular to the parting line of the mold. Move it to eject the molded product.

The above-described ejecting device and ejecting method can be applied to a lens molding mold, and an insert for lens molding is used in the lens molding mold.

[Effect]

In the ejecting device according to the present invention, since the ejecting means provided in each cavity is independent, even if there is the pressure fluctuation of the elastic body mentioned above or variations in the molding conditions of the molded product in the cavity, it is not affected by this. First, the ejecting means ejects the molded product in a predetermined manner and returns after ejection.

In addition, since the return of each eject means is detected by the detection means, all the detection means release the interlock of the controller that drives and controls the injection molding machine based on the detection signal that detects the return of the eject means, and the next injection molding is started. This makes it possible to prevent damage to the ejecting means and generation of defective molded products due to failure of the ejecting means to return.

Furthermore, in the ejecting method according to the present invention, the molded product is ejected by moving the molding insert of the molded product.
It is not necessary to provide a contact portion for an extrusion member such as an extrusion pin at the end of the molded product, so secondary processing for removing this contact portion can be omitted, and the structure of the insert is also simplified.

[Example] The drawing shows an injection mold to which a device according to an example of the present invention is applied, and this injection mold is made of thermoplastic resin such as PMMA (polymethyl methacrylate) or PC (polycarbonate). Lenses can be molded as molten resin.

Note that the mold here refers not only to metal, but also to glass,
This includes all molds made from other materials such as ceramics.

Furthermore, the injection mold according to this example is as shown in FIG.
This mold is for molding two lenses in which two cavities 3 are formed between an upper mold 1 and a lower mold 2, and the upper mold 1 and the lower mold 2 are divided at a horizontal parting line PL. The mold body 4 of the upper mold 1 consists of an insert guide member 5, a template 6, and a template 7, and the mold body 8 of the lower mold 2 consists of an insert guide member 9 and a template 1O. The inserts 11.12 of the upper mold 1 and the lower mold 2 are slidably arranged in insert fittings 13.14 inside a vertically arranged cylindrical insert guide member 5.9. 12 is movable in a direction perpendicular to the parting line PL.

The lower mold 2 is a fixed mold, and the mold body 8 of the lower mold 2 is fixed to a mold mounting member 15. Mold body 4 of upper mold 1 which is a movable mold
is a mold mounting member 16 consisting of an upper member 16A and a lower member 16B.
are connected by a bolt 17 shown in FIG. 2, and a disc spring 17A disposed around the outer periphery of the bolt 17 is interposed between the mold body 4 and the mold mounting member 16. Since the mold clamping device for the injection mold according to this embodiment is a direct pressure type, the mold mounting member 16
The downward clamping force of a clamping cylinder (not shown) is directly applied to the clamping cylinder. Moreover, since the injection molding die according to this embodiment is for injection compression molding, there is a gap S between the mold body 4 of the upper mold 1 and the mold mounting member 16 as shown in FIG. The upper mold 1
The mold body 4 and the mold mounting member 16 are opened and closed vertically by a gap of 5 minutes while being guided by guide pins 18.

Therefore, this injection mold is divided into three parts in total. A cylinder (not shown) is disposed below the mold attachment member 15 of the mold body 8 of the lower mold 2, and the cylinder pushes up the mold attachment member 16 against the clamping force of the clamping cylinder, thereby closing the gap S. It is beginning to form.

As shown in FIG. 1, a hydraulic cylinder 19 is provided in the mold mounting member 16 facing downward, and a piston rod 21 of a piston 20 of this cylinder 19 passes through a back insert 22 fixedly installed on the lower surface of the cylinder 19, and is attached to the lower end of the hydraulic cylinder 19. The 1-character clamp member 23 is attached. This '1-shaped clamp member 2
3 can be fitted into a T-shaped groove 24 formed in the insert 11. As shown in FIG. 4, one end of this T-shaped groove 24 is an open end 24A that opens on the outer peripheral surface of the insert 11, and the 1-shaped clamp member 23 is inserted into the T-shaped groove 24 from this open end 24A. It can be guaranteed. After making this bond,
By supplying and discharging oil to the hydraulic cylinder 19 and moving the piston rod 21 up and down, the inserter 11 is inserted into the insert fitting part 13 of the mold body 4 when dividing the upper mold 1 and the lower mold 2.
When the upper end surface of the insert 11 in which the T-shaped groove 24 is formed comes into contact with the lower surface of the back insert 22, the insert 11 becomes in a clamped state.

As described above, the hydraulic cylinder 19, the piston rod 21 of the piston 20, the back insert 22, the single-shaped clamp member 23, and the T-shaped groove 24 constitute the upper insert clamping means 25 for clamping the insert 11. , the hydraulic cylinder 19, and the piston rod 21 of the piston 20 constitute an upper insert moving means 25A that moves the insert 11 in a direction perpendicular to the parting line PL and inserts and removes it into the insert fitting part 13. Since the insert 22 receives the insert 11 by abutting the upper end surface of the insert 11, the insert receiver is a member.

The insert 12 of the lower mold 2 is also provided with a structure similar to that described above, and a hydraulic cylinder 26 is fixed upwardly on the mold mounting member 15, and the piston rod 28 of the piston 27 of this cylinder 26 is connected to the mold mounting member 15. A T-shaped ramp member 29 is attached to the upper end of the T-shaped ramp member 29, which is engaged with a T-shaped groove 30 formed in the lower end surface of the insert 12. These hydraulic cylinder 26, piston rod 28 of piston 27, T-shaped lamp member 29,
The T-shaped groove 30 and the mold mounting member 15 constitute a lower mold insert clamping means 31, of which the hydraulic cylinder 2
6. The piston rod 28 of the piston 27 constitutes a lower die insert moving means 31A that moves the insert 12 in a direction perpendicular to the parting line PL to insert and remove it into the insert fitting portion 14, and the die mounting member 15 constitutes a lower die insert moving means 31A that moves the insert 12 in a direction perpendicular to the parting line PL. The insert receiver, which receives the insert 12 by contacting the lower end surface thereof, is a member.

In the above, the hydraulic cylinder 19 is provided with a necessary sealing structure to prevent the oil in the cylinder 19 from leaking and reaching the insert 11, and the upper and lower thickness dimensions of the insert 11.12 are the same as those of the insert 11.12. Even if the temperature is raised to a predetermined temperature, the insert 1
1.12 is set such that no asymmetric thermal distortion occurs.

The hydraulic cylinder 19 is arranged to be able to slide vertically on the mold mounting member 16, and a pressure receiving member 32 for ejecting is fixedly installed at the upper end of the hydraulic cylinder 19. When the eject rod is inserted and the pressure receiving member 32 is pushed down, the hydraulic cylinder 19, back insert 22, and insert 11 are also pushed down, and the lens molded in the cavity 3 protrudes when the upper mold 1 and the lower mold 2 are separated. It is now possible to do so.

Therefore, the eject rod, the pressure receiving member 32, the hydraulic cylinder 19, the bank insert 22, the insert 11, and the piston rod 21 of the piston 20 for fixing the insert 11 to the back insert 22, the T-shaped ramp member 23, and the T-shaped groove 24. The ejecting means 34 is composed of the hydraulic cylinder 19, the back insert 22, the piston rod 21 of the piston 20, and the T-shaped ramp member 23.
, the T-shaped groove 24 is a component of the upper die insert clamping means 25, and the ejecting means 34.
The piston rod 21 is built into the center of both means 25 and 34.

The above ejecting means 34 is provided for each of the two cavities 3, and these ejecting means 3
4 have the same structure and are independent from each other.

As shown in FIG. 1, an eject pin 35 is also arranged in the center of the injection mold so as to be able to slide vertically.
The eject pin 35 is pushed down by being pushed down by the eject rod inserted through the hole 37 .

As shown in FIGS. 2 and 3, the spring force of the springs 40 and 41 wound around the eject return pins 38 and 39 acts on the pressure receiving members 32 and 36, so that when the eject rod rises, the pressure receiving members 32 and 36 32.36 mag is also ascending and returning to its old position.

As shown in FIG. 2, a cylindrical case 60 is fixed to the mold mounting member 16, and a detection rod 61 inserted into the case 60 is slidable in the horizontal direction while being guided by a guide member 62. There is. In addition, the detection rod 61 is connected to the spring 6
3, the ejecting means 34 is always urged toward the pressure receiving member 32, and the tip 61A of the detection rod 61 comes into contact with the guide slope 32A formed on the side surface of the pressure receiving member 32.

When the pressure receiving member 32 is lowered, the locking portion 61B of the detection rod 61 is locked to the protrusion 60A of the case 60, thereby preventing the detection rod 61 from moving forward.

A detector 64 is disposed behind the detection rod 61 and is attached to the mold mounting member 16 with a bracket (not shown), and this detector 64 is a limit switch. A proximity switch or the like may be used instead of the limit switch. When the ejecting means 34 returns upward by the spring 40 after ejecting the lens molded in the cavity 3, the detector 64 is actuated by the detection rod 61 which is retracted by the guide inclined surface 32A of the pressure receiving member 32.

The case 60, the detection roller 1 guide member 62, the spring 63, and the detector 64 constitute a detection means 65 for detecting the return of the ejecting means 34, and this detection means 65 is arranged in each of the two cavities 3. The ejecting means 34 is provided for each ejecting means 34.

FIG. 7 shows a control block diagram after the detector 64 of the detection means 65, and signals from the two detectors 64 are sent to a signal processing device 66. This signal processing device 66 is, for example, an AND
When signals from the two detectors 64, which are composed of circuits and other logic circuits and detect the return of the respective eject means 34, are input, the signal processing device 66 outputs a signal to the controller 67.

This controller 67 drives and controls the injection molding machine 68 according to a program. Further, the drive control of the injection molding machine 68 by this controller 67 is performed by the controller 6
7 is interlocked until a predetermined signal is input. Here, the predetermined signals are signals indicating that the injection mold is ready for the next injection molding operation, and one of the signals is transmitted to the signal processing device 66.
The other signal is, for example, a signal regarding the magnitude of the oil pressure from a hydraulic circuit supplying oil pressure to the hydraulic cylinder 19.26.

Although the signal processing device 66 and the controller 67 are shown separately in FIG. 7, it is of course possible to provide the signal processing device 66 as a part of the controller 67.

As shown in FIG. 2, the inserts 11 and 12 have a stepped shape with large diameter parts 11A and 12A and small diameter parts 11B and 12B.
Guide taper surface 1 is between 2A and small diameter portions 11B and 12B.
1C and 12C, and insert 11 like this
．． Guide tapered surface 11C2 provided on the entire circumferential side surface of 12
"i2C is inclined so as to form a tapered tapered surface toward the fitting direction when the insert 11.12 is fitted into the insert fitting part 13.14.

Since the injection molding die according to this embodiment is for lens molding as described above, the insert 11.12 and the insert fitting portion 13.14 are both formed into round shapes, and the insert fitting portion 13.14 is formed into a round shape. The diameter dimensions of parts 13 and 14 are those of insert 1.
-11. Smaller than the large diameter parts IIA and 12A of 12! Therefore, the insert fitting portion 13.14 is formed to have a shape and size compatible with the insert 11.12.

As shown in FIG. 6, a C-shaped circulation groove 42 is formed on the upper end surface of the insert 11, and this circulation groove 42 allows a temperature-regulating fluid such as steam, water, or air to flow, for example, before molding or during molding. Furthermore, it is a temperature regulating fluid circulation groove for adjusting the temperature of the insert 11 to a predetermined value after molding, and passages 43 and 44 are provided inside the back insert 22 to allow temperature regulating fluid to flow in and out of this circulation groove 42. It is being

As mentioned above, when the upper end surface of the insert 11 comes into contact with the back insert 22, the inlet 43A of the passage 43 opening on the lower surface of the bank insert 22, the outlet 44A of the passage 44, and the two-sided part 42A of the circulation groove 42, 42B, and a positioning member 45 for making this match is fixed to the lower surface of the back insert 22. This positioning member 45 is inserted into a portion of the T-shaped groove 24 near the open end 24A, that is, a portion out of the locking position with the one-shaped clamp member 23, to position the insert 11. . Specifically, the lower part of the positioning member 45 has a conical tapered surface 45A that tapers toward the insert 11.
An inclined surface 24B that widens toward the positioning member 45 is formed in a portion of the T-shaped groove 24 into which the positioning member 45 is inserted.

A thermocouple temperature sensor 46 is attached to the positioning member 45 so as to protrude from the bottom surface thereof, and as shown in FIG. There is. The temperature sensor 46 is for detecting the temperature near the molding surface of the insert II.

The insert 12 is also provided with a structure similar to that described above, that is, as shown in FIG.
When the lower end surface of the flow groove 48 comes into contact with the mold attachment member 15, the flow groove 48
A positioning member 49 is fixed to the mold mounting member I5 for aligning both ends of the same with the inflow/outlet of a hot fluid passage (not shown) provided inside the mold mounting member 15, and this positioning member 49 has a taper. The surface 49A is also the T-shaped groove 30.
Each has an inclined surface 30B.

A temperature sensor 50 is attached to the positioning member 49,
A small diameter hole 51 for inserting a temperature sensor 50 is provided at the bottom of the T-shaped groove 30.

As shown in FIG. 1, temperature regulating fluid circulation passages 52.53, 54.55 are also provided inside the mold bodies 4.8 of the upper mold 1 and the lower mold 2,
The temperature of these mold bodies 4.8 is kept at a predetermined level.

In the above, since a large number of lenses with different curvatures are molded, a large number of upper and lower inserts 11 and 12 having lens molding surfaces with different curvatures are prepared.

Next, we will discuss the effect.

When the inserts 11 and 12 are replaced, the upper mold 1 including the mold mounting member 16 rises and the upper mold 1 and the lower mold 2 are separated from the parting line PL, and the piston rod of the hydraulic cylinder 19 21 is lowered, the piston rods 2B of the hydraulic cylinder 26 are raised, and the T-shaped ramp members 23.29 attached to the tips of these piston rods 21.28 protrude from the insert fitting portions 13.14. The inserts II and 12 that are newly attached to the mold bodies 4 and 8 of the upper mold 1 and lower mold 2 are held by an arm of a robot (not shown) and are transferred horizontally from left to right in FIG.
As a result, the T-shaped lamp member 23.29 is inserted into the inserter 1-
11. These T-shaped grooves 24.
The open ends of the inserts 11 and 12 begin to engage.
The terminal end of the T-shaped groove 24.30 reaches the center of the groove.

This state is shown in FIG.

After this, the piston rod 21 of the hydraulic cylinder 19 is raised to pull up the insert 11, and the hydraulic cylinder 2
The piston rod 28 of No. 6 is lowered to pull down the insert 12. As a result, the insert 11.12 is fitted into the insert fitting part 13.14, which has a shape and dimensions compatible with the insert 11.12, but the insert 1
As described above, the guide tapered surfaces 11C and 12C that taper toward the fitting direction are provided on the side surfaces of 1.12, so the insert 11°12 can be inserted smoothly into the insert fitting portions 13, 14 without any force.

By moving the insert 11.12 in the direction perpendicular to the parting line PL in this manner, the insert 11.12 is inserted into the insert fitting portion 13.14 having a shape and size compatible with the insert 11.12. After this insertion is completed, the insert 11.12 is placed in precise position relative to the insert mating portion 13.14, and the insert 11. j2 is attached to the mold bodies 4.8 of the upper mold 1 and lower mold 2 with predetermined positioning accuracy.

In addition, the inserts 11.12 are connected to the insert fitting portions 13.
14, the tapered surfaces 45A, 49A of the positioning member 45.49 align with the inclined surface 2 of the T-shaped groove 24.30.
4B, 30B, the insert 11.12 has these tapered surfaces 45A, 49A, inclined surfaces 24B, 30
Positioned in the circumferential direction by the guiding action of B, and therefore when the upper end surface of the insert 11 comes into contact with the back insert 22 and the insert 11 is clamped, both ends 42A of the circulation groove 42 of the insert 11 shown in FIG. 42B
exactly coincide with the inlet 43A and outlet 44A.

When the lower end surface of the insert 12 comes into contact with the mold attachment member 15 and the insert 12 is clamped, both ends of the flow groove 48 and the unillustrated inlet and outlet coincide with each other in the same manner as described above. At this time, the temperature sensors 46, 50 are inserted into the small diameter holes 47,51.

The diametrical positioning of inserts ll and 12 is as follows:
As mentioned above, the T-shaped lamp member 23.29 is connected to the T-shaped groove 24,
This is done when the terminal end of 30 is engaged.

Next, the upper mold 1 is lowered by the mold clamping cylinder, and the upper mold 1 and the lower mold 2 are clamped while aligning with the guide pin 18 and the positioning pin 56 shown in FIG.
Lose it. Thereafter, molten resin is injected from a nozzle of an injection molding machine connected to the sprue bush 57, and the molten resin is passed through the sprue 58 and the runner 59 to fill the cavity 3. At this time, the mold mounting member 16 is raised by a gap of 3 by the cylinder (not shown) against the mold clamping force of the mold clamping cylinder, thereby increasing the vertical dimension of the cavity 3. In addition, the temperature of the upper mold 11 and the lower mold 2 is controlled by the flow grooves 42, 48 and the flow passages 52, 53.
, 54, 55 is set to the required temperature, and the temperature near the molding surface of the insert 11, 12 is detected by temperature sensors 46 and 50.

The molten resin in the cavity 3 gradually solidifies, and this solidification is performed while the molten resin receives the pressurizing force of the insert 11 due to the mold clamping force of the mold clamping cylinder, and the insert 11 follows the contraction of the molten resin as it solidifies. The insert 11 is lowered by the amount of compression.

After the molten resin solidifies in the cavity 3, the upper mold 1 including the mold attachment member 16 is raised by the mold clamping cylinder to separate the upper mold 1 and the lower mold 2, and the ejector inserted through the holes 33 and 37 is By pushing down the pressure receiving members 32, 36 with the rod, the hydraulic cylinder 19 including the piston rod 21, the back insert 22, the insert 11, and further the eject pin 35 are lowered, and the insert 11,
The molded product is ejected from the cavity 3 by the eject pin 35.

In this way, the molded product is ejected from the cavity 3 by the ejecting means 34, and during this ejection, the ejecting means 34 provided in each of the two cavities 3 are independently configured and actuated individually. Therefore, even if there are variations in the lens molding conditions within each cavity 3, the ejection force will not be affected by this, and the ejection force will be applied to each molded lens in a state biased from the center of the lens. without, i.e.
The ejection force can be applied accurately to the center of the lens, and the lens can be ejected while reliably cutting off the resin that has entered the small gap between the insert 11 and the insert fitting part 13.

In addition, the protrusion of the lens is made using the lens molding insert 11.
Therefore, there is no need to provide a contact portion on the peripheral edge of the lens for a pushing member such as an pushing pin, and the pushing can be carried out while preventing the lens from being scratched.

When the pressure receiving members 32 and 36 are released from being pressed down by the eject rod, the eject means 34 and the eject pin 3 are released.
5 is returned to its original position by the springs 40 and 41, and this return is also performed individually for each ejecting means 34, and as this return of the ejecting means 34 is performed, the detection roller 1 of the detecting means 65 becomes the first position. As shown twice, the pressure receiving member 32
This causes the detector 64 to move backward on the guide slope 32A.

When the detector 64 provided in each ejecting means 34 operates as described above and the signal from the detector 64 is input to the signal processing device 66, the signal from the signal processing device 66 and the other predetermined signals are input to the signal processing device 66. signal controller 6
7, the interlock of the controller 67 of the injection molding machine 6, which was performed after the above-mentioned filling of the molten resin into the cavity 3, is released. The mold is clamped by a mold clamping cylinder for the next injection molding operation, and the nozzle of the injection molding machine 68 is connected to the sprue bush 57 to begin the next injection molding operation.

Even if each of the ejecting means 34 is configured independently in this way, the next injection molding operation is started only after the return of all the ejecting means 34 is confirmed by the respective detection means 65. Even if the mold is clamped to start the process, it is possible to prevent damage to the ejecting means 34 due to failure of the ejecting means 34 to return, and it is also possible to prevent the occurrence of defects in the molded product.

After repeating the above injection molding and molding the required number of lenses, insert 11.1 is used to mold the next lens.
2, after separating the upper mold 1 and lower mold 2, the piston rod 21 of the hydraulic cylinder 19 is landed,
The piston rod 28 of the hydraulic cylinder 26 is raised, thereby causing the used insert (11.12) to protrude from the insert fitting 13.14. After this, hold inserts 11 and 12 with the arm of the robot and insert insert 1.
By moving 1.12 horizontally to the left from the cloth in Figure 2, the T-shaped lamp member 23.29 is moved from the T-shaped groove 24.30.
The inserts 11, 12 are removed.

By holding the new insert 11.12 with the robot arm and moving it horizontally from left to right in FIG.
0 is engaged with the T-shaped ramp member 23.29.

In the above embodiment, the detection means 65 was composed of the detection rod 61, the detector 64, etc., but this detection means 65
The configuration is not limited to this and is arbitrary, and if necessary, the detection means may be of any type as long as it can detect the return of the ejecting means 34, and the configuration of the ejecting means is also arbitrary.

Furthermore, although the molds in the above embodiments were for injection compression molding, the present invention can also be applied to ordinary injection molding molds in which no compression allowance is provided. Furthermore, the present invention can be applied to molds other than lens molding molds, and furthermore, the insert can be used in the upper mold,
The present invention can also be applied to a case in which the parting line is provided only on one of the lower molds, and furthermore, the present invention can be applied to a mold in which the parting line is vertical.

〔Effect of the invention〕

According to the present invention, since the ejecting means is provided in each cavity with an independent structure, it is possible to eject the molded product by the ejecting means and return the ejecting means after ejection in a predetermined manner. Since a detection means for detecting the return of the ejector is provided, it is possible to perform the next injection molding operation after confirming that all ejectors have returned, thereby preventing damage to the ejector or defective molded products due to failure of the ejector to return. It can be prevented. Further, according to the present invention, since the molded product is ejected by moving the molding insert of the molded product, there is no need to provide a contact portion against which an extrusion member such as an ejection pin is applied to the molded product. The secondary work of removal can be omitted, and the structure of the insert can also be simplified.

[Brief explanation of the drawing]

Figure 1 is a front cross-sectional view of the injection mold, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view taken along the line ■-■ in Figure 1. 5 is a sectional view taken along line V-V in FIG. 4, FIG. 6 is a perspective view showing the positional relationship between the insert and the positioning member, FIG. 7 is a control block diagram after the detection means, and FIG. 8 is a sectional view. is a partial cross-sectional view showing the time of mold division. 1... Upper mold, 2... Lower mold, 3... Cavity, 4
, 8... Mold body, 11.12... Insert, 13
．． 14... Insert fitting part, 25.31... Insert clamping means, 34... Ejecting means, 61
... detection rod, 64 ... detector, 65 ... detection means, 66 ... signal processing device, 67 ... controller, 68 ... injection molding machine. Applicant AIDA Engineering Co., Ltd.
Ya Stock Company Agent Patent Attorney Sanzo Kinoshita (and 2 others) Figure 3 Figure 4 Figure 5 Figure 6

Claims (4)

[Claims] (1) An injection molding mold having a plurality of cavities formed therein and capable of being divided into at least two parts, characterized in that each of the plurality of cavities is independently provided with an ejecting means. Eject device for molds. (2) The ejecting device for an injection mold according to claim 1, further comprising a detecting means for detecting return of the ejecting means, and the detecting means is provided for each ejecting means. (3) A molded product is molded in a cavity inside an injection mold, after which the mold is divided, and the molding insert of the molded product is moved in a direction perpendicular to the parting line of the mold to form the molded product. A method for ejecting an injection mold, characterized by ejecting. (4) An ejecting device or an ejecting method for an injection mold according to any one of claims 1, 2, and 3, wherein the injection mold is for molding a lens.