JP3147936U - Ejector device - Google Patents

Abstract

The present invention provides an ejector device that can reduce the burden on a user as a structure that does not require additional work on a slide base or the like. An ejector plate disposed between a core and a pedestal plate provided under the core, a slide path formed in the ejector plate, a slide base connected to a lower end of the loose core, and a lower end of the loose core And a guide rod for applying a moving force in the sliding path. The slide base is formed of a metal whose surface is nitrided, and is formed by connecting two opposing side plates by a connecting member whose ends are press-fitted into connecting holes provided in these side plates. And a guide bush supported between the opposing side plates so as to be rotatable in the direction of inclination of the loose core. A guide rod that forcibly slides the slide base as the ejector plate moves up and down is inserted into the guide bush. [Selection] Figure 2

Description

  The present invention moves through a loose core installed through a core that constitutes a part of a resin mold to form an undercut part in a resin molded product, and is movable obliquely and longitudinally with respect to the surface. The present invention relates to an ejector device.

  Conventionally, a device that moves a loose core that obliquely penetrates a core that constitutes one part of a resin molding die to form an undercut portion in a resin molded product and is movable in a longitudinal direction is called an ejector device. And JP-A-10-95019.

  By the way, the inclination angle K ° of the loose core 5 (FIG. 12) in the ejector device described in Japanese Patent Application Laid-Open No. 10-95019 is changed in an arbitrary range by the resin molded product 11 to be molded. The inclination angle K ° is determined by a user who molds the resin molded product 11 using this ejector apparatus.

When the conventional ejector device is assembled, when the lower end portion 5c of the loose core 5 is fixed to the slide base 33, the inclination angle (K °) of the guide rod 38 and the loose core 5 is the same inclination angle (= K °). The following work was performed so that it might become.
First, the lower end portion 5c of the loose core 5 is inserted into an insertion hole provided on the upper surface of the shaft coupling (referred to as a universal nut) 6, the length of the loose core 5 in the axial direction is adjusted, and assembly work is performed. At this time, the slide base 33 is incorporated in the ejector plate 1.
Next, an operation of inserting the guide rod 38 into the insertion hole of the guide bush 36 is performed. That is, in this insertion operation, the guide rod 38 is inserted into the insertion hole of the guide bush 36 that is rotatably supported with respect to the slide base 33 in a state where the slide base 33 is incorporated in the ejector plate 1.

  However, in the ejector device in which the universal nut 6 and the guide bush 36 are rotatable in the inclination angle direction of the loose core 5 with respect to the slide base 33, the assembly work of the lower end portion 5c of the loose core 5 and the insertion assembly work of the guide rod 38 are performed. Sometimes, the inclination angle of the universal nut 6 or the guide bush 36 does not always coincide with a desired inclination angle (K °) to which the loose core 5 is to be assembled.

  Therefore, when the direction of the insertion hole of the universal nut 6 does not match the desired inclination angle (K °), the direction of the insertion hole of the universal nut 6 is adjusted to match the inclination angle (K °). Must be assembled. This operation is very troublesome because the slide base 33 is already incorporated in the ejector plate 1.

  The assembling operation of the lower end portion 5c of the loose core 5 and the inserting and assembling operation of the guide rod 38 are not only performed when the ejector device is assembled for the first time, but also when assembling after being temporarily disassembled for maintenance. It must be repeated each time.

On the other hand, in use, it is necessary to change the inclination angle (K °) of the loose core 5 to be larger than the initial setting of the universal nut 6 and the guide bush 36 with respect to the slide base 33 due to the shape of the synthetic resin to be molded. May occur.
However, there is a limit in making it possible to cope with the case where the inclination angle (K °) is increased beyond, for example, 30 ° when the ejector device is manufactured. The reason is that the conventional integrated slide base is manufactured by cutting out from the block, and it is difficult to expand the rotatable range of the guide bush attached to this slide base beyond a certain inclination angle. is there.

  Originally, the pivotable range of the guide bush is manufactured so that the inclination angle is not limited as much as possible in order to reduce the burden on the user's additional work such as cutting to avoid interference between the guide bush and the slide base. It is desirable to keep it. However, with the structure of the conventional slide base, it is difficult to secure a sufficient space in the slide base assuming the above-described interference escape at the time of manufacture.

  Therefore, conventionally, when a fine tilt angle is required for the loose core, if further fine adjustment is required for the slide base, additional processing such as cutting is appropriately performed, and further nitriding treatment is performed as necessary. . Such additional work is a burden on the user, and it is most desirable to finish in such a state that no additional work is required at the time of manufacture.

On the other hand, in a resin mold that requires precise accuracy, the surface of a necessary portion is subjected to a so-called nitriding treatment, whereby the hardness of the metal surface is increased and the wear resistance is improved. As a result, accuracy can be maintained over a long period of time, and there is an effect that the mold life is extended. In particular, in a slide base that slides in the sliding path while holding the guide bush rotatably, it is desirable to perform nitriding treatment on the surface in order to improve the wear resistance. In the nitriding treatment, nitrogen is penetrated into steel or cast iron to form a compound layer of iron and nitrogen and a diffusion layer on the surface.
However, in consideration of the necessity for the additional work as described above, the nitriding process is often performed for the first time at the additional process without performing the nitriding process at the time of manufacturing, which is not preferable because the burden on the user who performs the additional process increases. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ejector device that can reduce the burden on the user as a structure that does not require additional work on a slide base or the like. .

The present invention has the following configuration in order to solve the above technical problem.
That is, the ejector device of the present invention is installed so as to penetrate the core, which is a constituent part of the resin molding die, to form an undercut portion in the resin molded product, and to move obliquely and longitudinally with respect to the surface. In the ejector device that moves the loose core,
Between the core and a pedestal plate provided at the lower part thereof, an ejector plate arranged to be movable up and down;
A sliding path formed in the ejector plate, extending in the relative horizontal movement direction of the lower end of the loose core when the loose core is raised and lowered;
A slide base that is movably disposed in the sliding path and connected to the lower end of the loose core;
A guide rod that applies a moving force in the sliding path to the lower end of the loose core when the ejector plate is raised and lowered, and the slide base is formed of a metal whose surface is subjected to nitriding treatment, A base body in which two side plates facing each other at a predetermined interval are connected by a connecting member whose ends are press-fitted into connecting holes provided in these side plates, and the loose core between the two facing side plates. The guide bush is rotatably supported in an inclined direction, and an insertion hole is formed in the guide bush along an axis perpendicular to the rotation axis, and the slide base is inserted into the insertion hole. The guide rod that is forcibly slid with the vertical movement of the ejector plate is slidably inserted,
The lower end of the loose core is attached to be rotatably supported in the tilt direction so that the guide rod and the loose core have the same tilt angle.

Here, press-fitting refers to press-inserting the end of a connecting member made of metal or the like into a shaft support hole having an inner diameter smaller than the outer diameter.
If the slide base is assembled by press-fitting the end of the connection member into the connection hole of the side plate, it is easy to widen the space in the slide base from the beginning of manufacture, so a resin mold that incorporates an ejector device As a result, the degree of freedom in user design is widened, and the need for additional machining is extremely reduced. For example, the inclination angle of the guide rod and the loose core can be set to rotate up to 45 °. Thus, if the rotation is set to 45 ° from the beginning, the user needs to further cut a part of the slide base to avoid interference with the slide base as required. Disappear. Therefore, nitriding treatment can be performed on the slide base from the beginning of manufacture.

The connecting hole is circular, and the cross section of the end of the connecting member press-fitted into the connecting hole can be formed in a circle having a diameter larger than the diameter of the connecting hole.
By rounding the end of the connecting hole and the connecting member that is press-fitted into it, when assembling the slide base by connecting the side plate and the connecting member, the left and right side plates are slightly rotated so that they are completely Fine adjustments can be made to be parallel.

In the two side plates, a rotation inhibiting member that contacts the guide bush and inhibits the guide bush from freely rotating in the inclined direction can be provided.
In addition, shaft pins inserted into bearing holes respectively provided on opposing inner walls in the side plate and rotatably supporting the guide bush, the rotation restraining member is an O-ring or a washer, the O-ring Alternatively, a washer can be provided around the shaft pin.

According to the present invention, during the initial assembly of the ejector device, the rotation direction of the guide bush insertion hole and the shaft coupling insertion hole is adjusted in advance so that the inclination angle is the same as the inclination angle of the loose core and the guide rod. Since it can hold | maintain with the suppression force by a member, each assembly | attachment operation | work can be performed smoothly. In particular, when inserting the guide rod into the insertion hole on the guide bush side, even when the slide base is incorporated in the ejector plate, there is an operation to make the direction of the insertion hole coincide with a predetermined inclination angle. As a result, the assembly work can be performed smoothly.
In addition, since the tilt angle at the time of the first assembly is maintained at the time of assembly after disassembly, the operation of matching the direction of the insertion hole with the predetermined tilt angle can be omitted.

  Furthermore, since the slide base has a structure in which two opposing side plates are connected by a connecting member, it is easy to widen the space in the slide base from the beginning. Therefore, the degree of freedom in designing the mold is widened for the user, and the slide base cutting and nitriding treatment conventionally performed on the user side is not required, so that the burden on the user can be reduced.

Hereinafter, in order to describe the present invention in more detail, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.
[Embodiment 1]
FIG. 1 shows an ejector device 100 according to a first embodiment of the present invention, and FIG. 2 shows an entire resin molding die incorporating the ejector device of FIG.
[Resin Mold A]
First, the resin molding die A provided with the ejector device 100 will be described. The overall shape of the resin molding die A is the same as that of a normal resin molding die, and a core 21b is disposed below the upper mold body 21a, and the resin molding is performed by the mold body 21a and the core 21b. The space 11 (FIG. 1) is partitioned. FIG. 1 partially shows a state where the resin molding die A shown in FIG. 2 is broken along the line II.

  A pedestal plate 23 is disposed below the core 21b. A spacer 24 is disposed between the core 21b and the pedestal plate 23 so as to be separated into left and right, and a chamber 25 is formed between the spacers 24 on both sides. Has been. The ejector plate 1 is disposed in the chamber 25 so as to be movable up and down.

  In this resin molding die A, the angle setting hole 12 (inclination angle K) of the core 21b constituting the resin molding die A is formed in order to form an undercut portion in the resin molding product formed in the resin molding space 11 described above. A long loose core 5 is provided, which is inserted into the angle (°) and extends obliquely and is movable in the longitudinal direction.

  The upper end portion of the loose core 5 functions as a mold portion 5a for molding a resin molded product in cooperation with the core 21b, and an L-shaped flange portion (also part of the undercut) is formed on the side portion of the resin molded product. ) Is integrally formed. The loose core 5 is inserted into a guide hole (angle setting hole) 12 formed obliquely in the core 21b and extends downward from the core 21b.

  Such a loose core 5 is slid in the up-down direction by being inclined at an inclination angle K ° in the angle setting hole 12 of the core 21 b by the ejector device 100. The ejector apparatus 100 for that purpose includes an ejector plate 1 configured by overlapping two plates 1a and 1b.

  The ejector plate 1 is provided with a sliding path 32 that extends in the relative horizontal movement direction at the lower end when the loose core 5 is raised and lowered. A slide base 33 is slidably disposed in the slide path 32, and the lower end of the loose core 5 is held at one end of the slide base 33 on the slide direction side. Details of the slide base 33 will be described later.

  Further, the ejector device 100 that raises and lowers the loose core 5 is provided with an angular guide rod (hereinafter simply referred to as a guide rod) 38 that is adjacent to and parallel to the loose core 5. V-shaped notches 39 are formed at both ends of the guide rod 38. The upper end of the guide rod 38 is supported by engaging a notch 39 with the pin.

[Slide base]
By the way, the detailed structure of the slide base 33 slidably provided on the ejector plate 1 described above is shown in FIGS.

  In the slide base 80 shown in FIGS. 4 and 9, the base body 81, which is entirely H-shaped, is formed of a steel material whose surface has been previously nitrided. Nitriding is a process in which nitrogen is penetrated into a steel material and a compound layer of iron and nitrogen and a diffusion layer are formed on the surface thereof. Such nitriding treatment increases the hardness of the surface of the slide base 80 and improves the wear resistance. Accordingly, the accuracy can be maintained over a long period of time, and as a result, the life as an ejector can be extended. In particular, it is preferable that the slide base 80 is easily abraded because it moves in the sliding path while holding the guide bush rotatably, and is preferably subjected to the nitriding treatment as described above.

The left and right rectangular side plates 81a and 81b of the base body 81 are arranged to face each other with a predetermined interval. Each of the side plates 81a and 81b is provided with circular connection holes 82a and 82b at the center thereof.
On the other hand, a connecting member 83 having a cylindrical shape as a whole and having both end portions 84a and 84b smaller in diameter than the central portion is provided. Both end portions 84a and 84b of the connecting member 83 are formed so that the outer diameter is slightly larger than the inner diameter of the connecting holes 82a and 82b provided in the side plates 81a and 81b. It is press-fitted into. By this press-fitting, the side plates 81a and 81b are connected by a connecting member 83 at a certain distance, and an H-shaped base body 81 is formed. The surface of the base body 81 can be subjected to the above nitriding treatment.

  Further, as shown in FIG. 9, between the two opposing side plates 81a, 81b in the base body 81 subjected to nitriding treatment, the guide bush 36 and the universal nut 6 are rotated on both sides of the central connecting member 83. It is pivotally supported. At this time, there is no space between the side plates 81a and 81b other than the connecting member 83, and there is nothing that prevents the rotation of the guide bush 36 and the universal nut 6. Therefore, these inclination angles can be set freely. The selected inclination angle is held by the rotation restraining members 48 and 49 made of O-rings or washers.

As described above, the completed slide base 80 has already been nitrided, and the inclination angle of the guide bush 36 and the universal nut 6 can be easily changed at any time. It is possible to eliminate the need for additional processing such as.
Further, it can be finished with an accuracy comparable to that of an integrated base body manufactured by cutting out from a block, and the side plates 81a and 81b and the connecting member 83 are firmly fitted in terms of strength. Therefore, it is possible to easily obtain an equivalent to the integrated base body.

  Further, when an integral base body is used, the long slide base 200 can be manufactured corresponding to a resin molded product in which a plurality of undercut portions are arranged in parallel as shown in FIG. Even a structure that supports a plurality of universal nuts 6 in a rotatable manner can be easily manufactured. In the slide base 200, the side plates 81 a and 81 b are connected by two connecting members 83, and three universal nuts 6 are arranged in parallel between the connecting members 83 and 83.

The example shown in FIG. 11 is compatible with a resin molding die in which undercut portions are arranged side by side by 90 ° in comparison with the example of FIG. In this example, a plurality of holes 111 for fixing a plurality of loose cores to the central base plate 112 are provided. The side plates 81a and 81b are respectively connected to the base plate 112 by a connecting member 83, and a guide bush 36 is rotatably supported between them. Such a slide base is also very difficult to manufacture by shaving from a block, but according to the present invention, it can be easily manufactured.
As described above, according to the present invention, the ejector device can be easily configured to meet various requirements in the resin molding die, and the application range of resin molding can be further expanded.

[Rotation suppression member]
Next, the rotation suppression member will be described.
As shown in FIG. 4, on the inner surface of the side plate 81a, a storage hole (O-ring storage hole) for storing an O-ring (rotation inhibiting member) 48 inserted in the shaft pin 46 and a shaft pin 47 are rotatable. An engaging hole is provided. The O-ring 48 is made of synthetic rubber (for example, nitrile rubber or fluororubber), and the O-ring 48 has a wire diameter on both the guide bush 36 in the bifurcated portion 34b and the inner wall of the bifurcated portion 34b. Use a size that allows frictional engagement. The outer diameter surface of the O-ring 48 is frictionally engaged with the storage hole (O-ring storage hole), and the inner diameter surface of the O-ring 48 is frictionally engaged with the shaft pin 47. The rotation of the guide bush 36 is inhibited by the rotation inhibition force caused by the friction engagement, but the rotation inhibition force caused by the friction engagement is only required to be manually rotated.

  On the other hand, the universal nut 6 also has a storage hole (O-ring storage hole) for storing an O-ring (rotation suppression member) 49 inserted into the shaft pin 47 on the side plate 81a side, as in the case of the guide bush 36 described above. A hole for rotatably engaging the pin 47 is provided. The O-ring 48 is made of synthetic rubber (for example, nitrile rubber or fluororubber), and the O-ring 49 has a wire diameter that is frictionally engaged with both the universal nut 6 and the hole of the side plate 81a. Use one. The O-ring 49 has an outer diameter surface frictionally engaged with the storage hole (O-ring storage hole), and an inner diameter surface frictionally engaged with the shaft pin 47. Then, the rotation of the universal nut 6 is inhibited by the rotation inhibition force caused by frictional engagement. The rotation deterrence force due to the frictional engagement is suitably such that the guide bush or the like can be manually rotated and stopped at an arbitrary position.

The slide base 33, the universal nut 6 and the guide bush 36, and the O-rings 48 and 49 are in a unit form assembled in advance.
A seat 5 a that is a recess for receiving the lower end portion of the loose core 5 is formed at the upper end portion of the universal nut 6. Furthermore, the universal nut 6 is provided with a through hole 35b having a central axis that is orthogonal to the rotational axis thereof and that coincides with the central line of the recess 35a described above. The lower end of the loose core 5 is supported by the adjustment joint 110 so as to expand and contract in the longitudinal direction with respect to the base body 34 and to be rotatable in the tilt direction.

[Guide rod 38]
Similarly, an insertion hole is formed in the guide bush 36 that is rotatably attached to the bifurcated portion 34b of the base body 34 along an axis perpendicular to the rotation axis, and the guide hole described above is formed in the insertion hole. The rod 38 is slidably inserted.

  An upper end portion is supported and fixed to the guide holder 40, and the guide rod 38 inserted through the insertion hole of the guide bush 36 in the slide base 33 extends to the pedestal plate 23 through the escape hole 41 formed in the lower plate 1b. The lower end portion is supported and fixed by engaging the notch portion with the pin 43 of the holder bush 42 attached to the base plate 23.

  The holder bush 42 is inserted into an opening 44 formed in the base plate 23 and fixed by a bolt 45. Although it has been described that the guide rod 38 is arranged parallel to the loose core 5, that is, at the same inclination angle, the angle of the guide rod 38 is set between the core 21b and the pedestal plate 23 as apparent from FIG. That is, since the height is determined (the height of the spacer 24 (see FIG. 2)), the lateral position, that is, the distance between the pin 39 provided on the guide holder 40 and the pin 43 provided on the holder bush 42. Depends on. In FIG. 1, the intersections (axis center points) 39 and 36c of the guide rod 38 and the intersections (axis center points) 5c and 6c of the loose core 5 form a parallelogram.

  That is, by establishing the parallelogram as described above, the ejector plate 1 can be moved while the guide rod 38 and the axial center points 39, 36c, 5c, and 6c of the loose core 5 maintain the same inclination angle (that is, parallel). The slide base 33 can be forcibly moved in the horizontal direction while being forcibly moved up and down. At this time, since the slide base 33 receives horizontal and vertical movement forces simultaneously, a force acts to rotate the slide base 32 in the slide path 32, but the four axial center points form a parallelogram. A parallel state with respect to the sliding path 32 can be maintained by the automatic alignment function that can be performed.

[Adjustment coupling 110]
Next, the adjustment joint 110 will be described with reference to FIGS. 1, 3, and 5.
The adjustment joint 110 includes a universal nut 6 that is a support member that supports the lower end portion 5 c of the loose core 5 on the base main body 34 and is rotatable in an inclined direction, and an adjustment screw 53 that contacts the lower end portion 5 c of the loose core 5. Furthermore, the outer peripheral surface of the adjusting screw 53 until it abuts against the bolt member (cap bolt) 51 and washer (spacer collar) 52 that fasten the adjusting screw 53 and the lower end portion 5c of the loose core 5 and the other end portion of the universal nut 6. And a lock nut 55 that is screwed together.

  The universal nut 6 disposed in the bifurcated portion 34a is rotatably attached to the opposing wall surface of the bifurcated portion 34a by a shaft pin 46. The universal nut 6 is provided with a through hole 6b that coincides with a central axis perpendicular to the rotation axis. In addition, the thread part is formed in the internal peripheral surface of the through-hole 6b.

  As shown in FIG. 5, the adjusting screw 53 is a hollow cylinder having a threaded portion 53a on the outer peripheral surface. Further, the adjustment screw 53 is provided with an inner hexagon wrench hole 54 on the inner peripheral surface of one end of the hollow cylinder, screwed into the through hole 6 b of the universal nut 6, and is in contact with the lower end portion 5 c of the loose core 5.

  The adjustment screw 53 and the lower end portion 5 c of the loose core 5 are fastened by the cap bolt 51 after fine adjustment of the axial length of the loose core 5 is completed. When fastening with the cap bolt 51, the spacer collar 52 is inserted between the adjustment screw 53. This is to prevent the hexagonal hole of the adjustment screw 53 from being crushed.

  The lock nut 55 has a hollow cylindrical shape having a threaded portion 56a on the inner peripheral surface. The lock nut 55 is provided with an inner hexagon wrench hole 56 on the inner peripheral surface of one end of the hollow cylinder.

Next, in the work process of assembling the ejector device 100, the work of assembling the lower end portion 5c of the loose core 5 and the work of inserting and assembling the guide rod 38 will be described.
First, the rotation of the universal nut 6 and the guide bush 36 is inhibited by the rotation inhibition force due to the frictional engagement of the O-rings 47 and 48, and the angle K ° is maintained. Therefore, when the ejector device 100 is assembled, the loose core 5 Based on the design inclination angle K °, the universal nut 6 is previously set so that the angle between the vertical line of the slide base 33 and the axial direction of the insertion hole provided on the upper surface of the universal nut 6 becomes K °. Position it. Similarly, the guide bush 36 is positioned in advance so that the angle between the vertical line of the slide base 33 and the axial direction of the insertion hole of the guide bush 36 is K °.

[Assembly of the lower end of the loose core 5]
First, an assembling operation of the lower end portion of the loose core 5 will be described.
In the operation of fixing the lower end portion of the loose core 5 to the slide base 33, the inclination angle of the insertion hole provided on the upper surface of the universal nut 6 is set to be the same as the inclination angle (K °) of the loose core 5. The lower end of the loose core 5 can be smoothly inserted into the insertion hole provided in the upper surface of the universal nut 6. Next, the adjustment joint 110 is used to adjust the rod length of the loose core 5 and perform the assembly work. The rod length of the loose core 5 can be adjusted by adjusting the screw in the range A shown in FIG. As described above, the rod of the loose core 5 manufactured based on the design value is not cut after assembly, and the length is adjusted within the range of adjustment of the adjustment joint 110. For example, the thermal expansion amount B of the rod of the loose core (FIG. 3) can be absorbed. After adjusting the rod length of the loose core 5, the slide base 33 is incorporated into the ejector plate 1.

[Guide rod 38 insertion and assembly work]
Next, an operation for inserting the guide rod 38 into the insertion hole of the guide bush 36 will be described. This insertion operation is an operation of inserting the guide rod 38 into the insertion hole of the guide bush 36 that is rotatably supported with respect to the slide base 33 in a state in which the slide base 33 is incorporated in the ejector plate 1. .

  In such an operation of inserting the guide rod 38 into the insertion hole of the guide bush 36, the inclination angle of the insertion hole of the guide bush 36 is already set and held so as to be the inclination angle (K °) of the guide rod 38. Therefore, even when the slide base 33 is incorporated in the ejector plate 1, the operation of making the direction of the insertion hole coincide with K ° can be omitted, and the guide rod 38 can be smoothly inserted into the insertion hole of the guide bush 36. Can be inserted into.

  In addition, even when the ejector device 100 is assembled after disassembly, the tilt angle of the universal nut 6 and the guide bush 36 is maintained as it was during the initial assembly, so that the work of finding the direction of the insertion hole and matching it is omitted. Therefore, each assembling operation can be performed more smoothly.

[Embodiment 2]

[Rotation suppression member]
The rotation restraining member is not limited to a synthetic rubber O-ring. For example, a spring washer 51 may be used instead of the O-ring. Further, as long as the rotation of the universal nut 6 or the guide bush 36 can be suppressed, the other can be inserted into the shaft pins 46 and 47.
The spring spring washer 51 inserted into the shaft pins 46 and 47 is in the bifurcated portions 34a and 34b, and either one of the circular faces of the spring spring washer 51 also rubs against the universal nut 6 (or the guide bush 36). You may comprise so that it may engage and the other surface may frictionally engage with the inner wall of the forked part 34a, 34b. Then, the rotation of the universal nut 6 (or the guide bush 36) is inhibited by the rotation inhibition force due to the frictional engagement of the countersunk spring washer 51. In addition, when using a washer in this way, a corrugated washer, a spring washer, a toothed washer, and the like may be used in addition to the spring washer.

[Embodiment 3]
Furthermore, in the above-described first embodiment, the rotation suppression member inserted into the shaft pins 46 and 47 is described as being used. However, the rotation suppression member is limited to the case where the rotation suppression member is inserted into the shaft pins 46 and 47. It is not a thing. For example, as another embodiment of the first friction member and / or the second friction member, as shown in the enlarged side view of the universal nut 6 (or the guide bush 36) in FIG. A total of four synthetic rubber blocks 71 that are engaged with both the universal nut 6 (or the guide bush 36) and the inner walls of the bifurcated portions 34a, 34b are attached to the 180 ° symmetrical positions of the shaft pins 46, 47. It is good also as composition which is doing.

[Embodiment 4]
As another embodiment of the rotation restraining member, as shown in the enlarged side view of the universal nut 6 (or guide bush 36) of FIG. 8B, the universal nut 6 (or Two synthetic rubber bands 72 having a thickness that engages both the guide bush 36) and the inner walls of the bifurcated portions 34a, 34b are connected to the universal nut 6 (or guide bush) from the vertical direction of the shaft pins 46, 47. 36). The band 72 is frictionally engaged with the universal nut 6 (or the guide bush 36), and the other surface is frictionally engaged with the inner walls of the bifurcated portions 34a and 34b.

    In the above-described embodiments, the shaft coupling (the universal nut 6 is rotatably disposed in the bifurcated portion 34a of the base body 34 has been described. However, the lower end portion of the loose core 5 uses the universal nut 6. In addition, the present invention also includes a configuration in which the base body 34 is directly and rotatably locked with the base body 34. In the case of this other embodiment, only the guide bush 36 is rotated by the rotation suppression force due to the frictional engagement of the rotation suppression member. That rotation is suppressed.

  The ejector apparatus of the present invention is incorporated in a resin molding die and used for manufacturing a resin molded product provided with an undercut portion. This device actively moves the lower end of the loose core in the lateral direction when the ejector plate is raised and lowered, and obtains the combined force of the lifting force and lateral movement force of the ejector plate to actively move the loose core in the longitudinal direction. Move. Therefore, by using this device, rubbing between the loose core and the edge of the opening of the insertion hole of the core is prevented, and wear of the loose core is suppressed, so that the amount of undercut can be increased as compared with the prior art.

It is sectional drawing which shows the outline | summary of the ejector apparatus of this invention. It is a perspective view which shows the whole resin molding die provided with the ejector apparatus shown by FIG. It is an expanded sectional view of the slide base which comprises the ejector apparatus shown by FIG. It is a disassembled perspective view of a slide base. It is a longitudinal cross-sectional view of the parts which comprise an adjustment coupling. It is a XI-XI arrow line view of FIG. FIG. 6 is an enlarged side view of a first friction member and / or a second friction member according to another embodiment of the present invention. FIG. 6 is an enlarged side view of a first friction member and / or a second friction member according to another embodiment of the present invention. It is a whole perspective view of a slide base. It is a perspective view which shows the example which provided multiple universal nuts. It is a perspective view which shows the other example which provided multiple universal nuts. It is a perspective view which shows the whole structure of the conventional ejector apparatus.

Explanation of symbols

1 Ejector plate 5 Loose core 6 Universal nut 12 Angle setting hole (guide hole)
23 Base plate 24 Spacer 25 Chamber 32 Sliding path 33, 80, 200 Slide base 34, 81 Base body 34b Fork 36 Guide bush 38 Guide rod 39 Notch 40 Guide holder 46, 47 Shaft pin 46
48, 49 O-ring 53 Adjustment screw 55 Lock nut 83 Connecting member 100 Ejector device 112 Base plate

Claims (4)

In an ejector device that moves through a core that is a constituent part of a resin molding die to form an undercut part in a resin molded product, and moves a loose core that is obliquely and longitudinally movable with respect to its surface,
Between the core and a pedestal plate provided at the lower part thereof, an ejector plate arranged to be movable up and down;
A sliding path formed in the ejector plate, extending in the relative horizontal movement direction of the lower end of the loose core when the loose core is raised and lowered;
A slide base that is movably disposed in the sliding path and connected to the lower end of the loose core;
A guide rod that applies a moving force in the sliding path to the lower end of the loose core when the ejector plate is raised and lowered, and the slide base is formed of a metal whose surface is subjected to nitriding treatment, A base body in which two side plates facing each other at a predetermined interval are connected by a connecting member whose ends are press-fitted into connecting holes provided in these side plates, and the loose core between the two facing side plates. The guide bush is rotatably supported in an inclined direction, and an insertion hole is formed in the guide bush along an axis perpendicular to the rotation axis, and the slide base is inserted into the insertion hole. The guide rod that is forcibly slid with the vertical movement of the ejector plate is slidably inserted,
An ejector device, wherein the lower end of the loose core is attached to be rotatably supported in the tilt direction so that the guide rod and the loose core have the same tilt angle.   The connection hole is circular, and a cross section of an end portion of a connection member press-fitted into the connection hole is formed in a circle having a diameter larger than the diameter of the connection hole. The ejector apparatus of 1.   3. The ejector according to claim 1, wherein the side plate is provided with a rotation restraining member that contacts the guide bush and prevents the guide bush from freely pivoting in the tilt direction. apparatus. A shaft pin inserted into a bearing hole provided in each of the opposing inner walls of the base body, and rotatably supporting the guide bush;
The ejector device according to any one of claims 1 to 3, wherein the rotation restraining member is an O-ring or a washer, and the O-ring or the washer is provided around the shaft pin.

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