JP2011068040A - Undercut processing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an undercut processing mechanism capable of easily performing mold-removal even when the escape direction of an ruggedness shape of an outer surface or an inner surface of a molding and the escape direction of an undercut part are different from each other. <P>SOLUTION: A slider 40 which supports an undercut molding core 30, a base member 50 which movably connects the slider 40 and a holder 60 which is driven to be movable in the mold removing direction of the molding P while surrounding the slider 40 are disposed on a movable mold 13, a first guide means for guiding the slider 40 in the escape direction from the undercut part P1 is disposed in the holder 60, and a second guide means for guiding the slider 40 in an oblique direction where the slider 40 is moved simultaneously in the mold removing direction and in the escape direction when the slider 40 is drawn via the first guide means in accordance with a drive in the mold removing direction of the holder 60 is disposed on a base member 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an undercut processing mechanism that enables a die cut to be performed on an undercut portion that is recessed in a direction that intersects with a die-cutting direction of a molded product in a mold including a fixed die and a movable die.

  Conventionally, as this type of molding die device, for example, a loose core ejector device described in Patent Document 1 is known. That is, it is locked to a mold core that forms the inner surface of the molded product, a movable loose core support rod that penetrates the core and is inclined with respect to the core surface, a movable mold plate, and a pedestal plate. And a slide base disposed in the slide path of the ejector plate so as to be slidable relative to the guide means rod, and the loose core support rod is interlocked with the movement of the slide base. .

  In such a loose core ejector device, one end of the guide means rod is locked to a holder that is tightly fitted in a recess formed in the lower surface of the movable side template, and the loose core support rod is attached to the core. The insertion hole formed at substantially the same inclination angle as that of the guide means rod is slidably inserted, and this insertion hole is the only angle setting hole for setting the inclination angle of the loose core support rod.

JP 2002-326233 A

  However, in the conventional technique as described above, not only the loose core support rod but also the guide means rod are inclined, and the mechanism for moving each rod at the same inclination angle is the ejector plate and the movable side type. It is comprised so that it may disperse | distribute to a board. Therefore, a large installation space is required compared to the amount of movement of the piece with the undercut part shape necessary for die-cutting of the undercut part of the molded product, and the overall structure is complicated, requiring time and labor for assembly. There was a problem that it was difficult to reduce costs.

  In addition, it is possible to cope only when the undercut portion is in one direction of the outer side or the inner side of the molded product. For example, the relief direction of the uneven shape on the outer surface or inner surface of the molded product and the relief direction of the undercut portion. In such a case, it was impossible to punch out such a molded product. Therefore, in addition to the shape of the undercut portion in the moldable molded product, there is a problem that the position and number are limited to a very narrow range.

  The present invention has been made paying attention to the problems of the prior art as described above, can be configured compactly, can meet the demand for space saving, and can be processed and incorporated into a mold. It is easy to remove the die even when the relief direction of the concave and convex shape on the outer surface or inner surface of the molded product is different from the relief direction of the undercut part. An object of the present invention is to provide an undercut processing mechanism that can be used.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In a mold (11) composed of a fixed mold (12) and a movable mold (13), an undercut portion (P1) that is recessed in a direction crossing the mold cutting direction of the molded product (P) can be punched. An undercut processing mechanism,
An undercut molding core (30) for molding the undercut portion (P1);
A slider (40) for supporting the undercut molding core (30);
A base member (50) fixed to the movable mold (13) and movably connecting the slider (40);
A part of the inner surface of the molded product (P) is molded by being driven by the movable mold (13) so as to be movable in the mold-release direction of the molded product (P) in a state of surrounding the slider (40). And a holder (60) having a through-hole (63) through which the undercut core (30) protrudes and retracts to the outside,
In the holder (60), the slider (40) is moved in the escape direction in which the undercut portion (P1) is inserted into the holder (60) through the through hole (63) so as to intersect the die cutting direction. Providing a first guide means for guiding,
When the slider (40) is pulled by the base member (50) through the first guide means as the holder (60) is driven in the die-cutting direction, the slider (40) is pulled by the die-cutting member. An undercut processing mechanism, characterized in that second guide means is provided for guiding in a tilt direction that simultaneously moves in the direction and the escape direction.

  [2] The holder (60) is externally fitted to the base member (50) so as to be movable in the mold-release direction in a state of surrounding the slider (40) together with the base member (50). The undercut processing mechanism according to [1], wherein the undercut processing mechanism is guided by the base member (50) when driven in the die-cutting direction.

[3] One of the holder (60) and the slider (40) is provided with a first lateral groove (65) extending in the clearance direction in which the slider (40) is movable with respect to the holder (60). ,
In either one of them, a first horizontal line (42) that extends in the escape direction and is slidably fitted in the first horizontal groove (65) is provided,
The undercut processing mechanism according to [1] or [2], wherein the first lateral groove (65) or the first lateral strip (42) in the holder (60) is the first guide means.

[4] A second oblique groove (41) extending in the inclined direction in which the slider (40) is movable with respect to the base member (50) is provided in any one of the base member (50) and the slider (40). )
On either one of them, a second oblique line (51) that extends in the inclined direction and fits slidably into the second oblique groove (41) is provided,
[1], [2] or [3], wherein the second inclined groove (41) or the second oblique line (51) in the base member (50) is the second guide means. Undercut processing mechanism.

[5] It has an ejector pin (20) which is driven in the die-cutting direction and moves out, and the holder (60) is fixed to the tip of the ejector pin (20).
The undercut processing mechanism according to [1], [2], [3], or [4], wherein the holder (60) is driven by an ejecting operation of the ejector pin (20).

The present invention operates as follows.
According to the undercut processing mechanism described in [1], the undercut molding core (30) is supported by the slider (40), and the slider (40) is a base member fixed to the movable die (13). (50) is movably connected. Furthermore, the movable die (13) is provided with a holder (60) that is driven in the die-cutting direction while surrounding the slider (40). The holder (60) itself forms a part of the inner surface of the molded product (P), and the through-hole (30) that allows the undercut molding core (30) that fits inside together with the slider (40) 63).

  A first guide means is provided in the holder (60), and the slider (40) allows the undercut portion (P1) to pass through the through hole (63) of the holder (60). Guided in the direction of escape to immerse inside. Here, the escape direction is a direction intersecting with the die cutting direction. On the other hand, the base member (50) is provided with second guide means, and the second guide means guides the slider (40) in an inclined direction that moves simultaneously in the die-cutting direction and the escape direction. The

  That is, at the time of molding, the holder (60) itself also molds a part of the inner surface of the molded product (P), and the undercut molding core (30) protrudes to the outside from the through hole (63) of the holder (60) and is under. A cut part (P1) is shape | molded. At the time of die cutting, the holder (60) itself is driven in the die cutting direction, and the slider (40) is moved in the tilt direction via the first guide means and the second guide means as the holder (60) is driven. Guided. Thereby, even when the relief direction of the concavo-convex shape of the outer surface or the inner surface of the molded product (P) and the relief direction of the undercut part (P1) are different from each other, it is possible to easily perform die cutting.

  According to the undercut processing mechanism as described above, the overall structure can be simplified, and the manufacturing cost can be greatly reduced. Further, the member that supports the undercut molding core (30) is concentrated only on the movable die (13) via the holder (60) without being distributed to the ejector base plate (15) and the movable die (13). Can be arranged. As a result, a compact configuration can be achieved, a space-saving request can be met, and processing and incorporation into the mold (11) are facilitated.

  According to the undercut mechanism described in [2] above, the holder (60) surrounds the slider (40) together with the base member (50) in the die-cutting direction with respect to the base member (50). The outer fitting is movable. The holder (60) is guided to the base member (50) when driven in the mold release direction. This eliminates the need for a special structure for guiding the holder (60) in the die-cutting direction, and can reliably guide the holder (60) in the die-cutting direction.

  According to the undercut processing mechanism described in [3] above, the one of the holder (60) and the slider (40) extends in the escape direction in which the slider (40) can move with respect to the holder (60). One horizontal groove (65) is provided, and on one of the other, a first horizontal line (42) extending in the escape direction and slidably fitted in the first horizontal groove (65) is provided, and the holder (60) is provided. One of the first lateral grooves (65) or the first lateral strip (42) is used as the first guide means.

  Due to the fitting relationship between the first lateral groove (65) and the first lateral strip (42), the slider (40) is connected to the holder (60) so as to be able to be pushed and pulled. Along with this, the slider (40) can also be simultaneously interlocked in the mold release direction. Furthermore, the slider (40) can be guided to the holder (60) in the escape direction.

  According to the undercut mechanism described in [4] above, either the base member (50) or the slider (40) is inclined in a direction in which the slider (40) can move relative to the base member (50). A second oblique groove (41) extending is provided, and a second oblique line (51) extending in the same inclination direction and slidably fitted into the second oblique groove (41) is provided on either one of the base and the base. The second oblique groove (41) or the second oblique line (51) on the member (50) is used as the second guide means.

  Due to the fitting relationship between the second oblique groove (41) and the second oblique line (51), when the slider (40) is interlocked with the drive of the holder (60), its moving direction is restricted to the inclined direction. The For this reason, the slider (40) can be guided to a position where the undercut molding core (30) enters the inside through the through hole (63) of the holder (60) and separates from the undercut portion (P1).

  Further, according to the undercut processing mechanism described in [5], when the molded product (P) is die-cut, it operates according to the ejecting operation of the ejector pin (20) driven in the die-cutting direction. When molding is finished and the fixed mold (12) is separated from the movable mold (13), the outside of the molded product (P) appears. Next, the ejector pin (20) is pushed out so as to separate the molded product (P) from the movable die (13) for die cutting.

  Along with the ejecting operation of the ejector pin (20), the holder (60) fixed to the tip of the ejector pin (20) is driven in the die-cutting direction as it is, and the holder (60) itself is a molded product. (P) is separated from the movable mold (13). In conjunction with this, inside the holder (60), as described above, the undercut molding core (30) relatively moves via the slider (40), and the undercut molding core (30) is moved to the holder (60). ) Enters the inside through the through-hole (63) and leaves the undercut portion (P1). Thereby, the whole molded article (P) can be removed from the mold (11).

  According to the undercut processing mechanism according to the present invention, among the molded products having an undercut portion that is recessed in the direction intersecting with the die-cutting direction of the molded product, in particular, the relief direction of the uneven shape of the outer surface or the inner surface of the molded product, Even a molded product in which the undercut portions have different escape directions can be easily punched.

  In addition, the entire mechanism can be configured in a compact manner, meeting the demand for space saving, easy to process and incorporate into the mold, and simple in configuration, requiring time and labor for assembly. Therefore, cost reduction can be realized.

It is a partial cross section explaining the operation | movement at the time of shaping | molding of the metal mold apparatus and embodiment of an undercut process which concern on embodiment of this invention. It is a partial cross section explaining the operation | movement at the time of die cutting of the shaping die apparatus which concerns on embodiment of this invention, and an undercut process mechanism. It is a perspective view which shows the external appearance of the whole at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the external appearance of the whole at the time of die cutting of the undercut processing mechanism which concerns on embodiment of this invention. It is a perspective view which shows the mode in the holder at the time of die cutting of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the mode in the holder at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which shows the relative positional relationship of a slider and a base member at the time of shaping | molding of the undercut process mechanism which concerns on embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the principal part of the undercut process mechanism which concerns on embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments representing the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 are longitudinal sectional views for explaining the operation of the mold 11 and the undercut processing mechanism constituting the molding apparatus 10 according to the present embodiment. FIG. 1 shows a state during molding of the molded product P, and FIG. 2 shows a state during die cutting of the molded product P.

  The molding die apparatus 10 is an apparatus that molds a molded product P having an undercut portion P <b> 1 with a mold 11. As shown in FIG. 1, the molded product P according to the present embodiment is a plate-like member as a whole, one end edge side of which is bent downward, and a circle is formed on the lower end side of the bent portion. An undercut portion P1 that is a hole is formed. The undercut portion P1 is recessed in a direction (left-right direction) that intersects the die-cutting direction (vertical direction) of the molded product P.

  A corner P2 where one end edge side of the molded product P is bent downward protrudes slightly upward from the horizontal reference surface of the molded product P. In such a molded product P, the relief direction from the undercut portion P1 (left-right direction) and the relief direction of the concave or convex shape on the outer surface or inner surface including the corner portion P2 of the molded product P (mainly the direction separating from the corner portion P2). ) Are different from each other. The material of the molded product P is not limited to a synthetic resin such as plastic, and a metal such as iron or copper is also applicable.

  As shown in FIGS. 1 and 2, the mold 11 includes a fixed mold 12 that molds the outer surface side of the molded product P and a movable mold 13 that molds the inner surface side of the molded product P. The undercut processing mechanism includes an undercut molding core 30 that molds the undercut portion P1, a slider 40 that supports the undercut molding core 30, a base member 50 that movably connects the slider 40, and a die cutting Holder 60 driven in the direction.

  A movable mounting plate 14 is installed below the movable mold 13, and an ejector base plate 15 made of a double-layered plate material can be driven in the vertical direction between the movable mold 13 and the movable mounting plate 14. It is arranged. The ejector base plate 15 is provided with four ejector pins 20 that are driven in the die-cutting direction and project in accordance with the drive of the ejector base plate 15. Each ejector pin 20 is formed of a round bar member, and a base end portion 22 is fixed to the ejector base plate 15 via a knock pin 21.

  The distal end portion 23 of each ejector pin 20 penetrates through the movable mold 13 and is fixed to the lower four corners of the holder 60. The movable die 13 is provided with a recess 13a for interior mounting the holder 60 so as to be movable in the mold release direction, and a base member 50 is fixed to the bottom of the storage portion 13a via a knock pin 52. Has been. The base member 50 is a member that connects the slider 40 so as to be movable, and is a member in which a holder 60 that surrounds the slider 40 is externally fitted and guided in a die-cutting direction. Is formed.

  A slider 40 is movably connected to the upper end side of the base member 50. The upper end side of the base member 50 is inclined in the direction in which the slider 40 moves, that is, in the inclined direction in which the slider 40 moves simultaneously in the die-cutting direction and the escape direction from the undercut portion P1, and along the inclined upper edge. A second oblique line 51 is provided to which the slider 40 is movably connected. Here, the second oblique line 51 is formed as a protrusion that is slidably fitted into the dovetail groove.

  The slider 40 is a member that supports the undercut molding core 30, and is formed in a piece shape as shown in FIGS. The lower end side of the slider 40 is connected to the upper end side of the base member 50 so as to be movable in the tilt direction. The lower end side of the slider 40 is inclined in the inclined direction, which is the direction in which the slider 40 moves with respect to the base member 50, and slides on the second oblique line 51 along the inclined lower edge. A second oblique groove 41 that is movably fitted is provided. Here, the second oblique groove 41 is formed as a dovetail groove.

  The upper end side of the slider 40 is connected to the connecting member 64 provided on the ceiling side of the holder 60 in the holder 60 so as to be movable in the escape direction. The upper end side of the slider 40 extends in the left-right direction parallel to the escape direction, which is the direction in which the slider 40 moves with respect to the holder 60, and slides on the connecting member 64 along the upper edge. A first horizontal strip 42 is provided to be fitted. Here, the first horizontal stripe 42 is formed as a protrusion that is slidably fitted into the dovetail groove.

  Further, an undercut molding core 30 protrudes laterally on one side end face of the upper end side of the slider 40 and is integrally supported. The undercut molding core 30 is a part for molding the undercut portion P1, and is formed in a columnar shape that matches the circular hole that is the undercut portion P1.

  The holder 60 is externally fitted to the base member 50 so as to be movable in the mold-release direction in a state in which the slider 40 is surrounded together with the base member 50 in the storage portion 13a of the movable mold 13. As shown in FIG. 3, the holder 60 is formed by combining two symmetrical parts, and is formed in a box shape including an internal space 61 (see FIG. 8) having an open lower end side.

  The tip portions 23 of the respective ejector pins 20 are fixed to the four corners of the lower end of the holder 60, and the holder 60 is driven in the mold release direction by the respective ejector pins 20. The upper end surface of the holder 60 is a part for molding the inner surface side of the molded product P together with the movable mold 13, and in particular, one end side of the upper end surface is a tapered portion inclined upward corresponding to the corner portion P2 of the molded product P. 62.

  A through hole 63 through which the undercut molding core 30 protrudes and protrudes to the outside is formed on one end face of the holder 60. Further, a gap corresponding to a space portion (cavity) for forming a portion where the undercut portion P1 is bent downward is provided between one end face of the holder 60 and the inner wall of the storage portion 13a. Yes.

  A connecting member 64 for connecting the slider 40 so as to be able to be pushed and pulled is fixed to the ceiling portion of the internal space 61 of the holder 60. The connecting member 64 is provided with a first lateral groove 65 along which a first lateral strip 42 in the slider 40 is slidably fitted along a lower end edge extending in the left-right direction. Here, the first lateral groove 65 is formed as a dovetail groove.

  The first lateral groove 65 can move the slider 40 in the internal space 61 of the holder 60 in the escape direction in which the undercut portion P1 enters the holder 60 from the through hole 63 so as to intersect with the die-cutting direction of the molded product P. The 1st guide means to guide to is comprised. The first horizontal groove 65 may be provided on either the connecting member 64 in the holder 60 or the upper edge of the slider 40, and the first horizontal stripe 42 is provided on the other. Here, either the first transverse groove 65 or the first transverse strip 42 provided on the holder 60 side serves as the first guide means.

  In addition, the second ridge 51 provided on the base member 50 is arranged such that when the slider 40 is pulled upward via the first guide means as the holder 60 is driven in the mold release direction, the slider 40 Second guide means for guiding in the direction of inclination that simultaneously moves in the die-cutting direction and the escape direction is formed. The second oblique line 51 may be provided on either the upper end edge of the base member 50 or the lower end edge of the slider 40, and the second oblique groove 41 is provided on either one of them. Here, either the second oblique line 51 or the second oblique groove 41 provided on the base member 50 side serves as the second guide means.

Next, the operation of the present embodiment will be described.
As shown in FIG. 1, at the time of molding, the cavity between the fixed mold 12 and the movable mold 13 is filled with dissolved resin, and a molded product P having an undercut portion P1 is molded. At this time, the ejector base plate 15 is in contact with the movable mounting plate 14, and the holder 60 is held at the molding position by the ejector pins 20 on the ejector base plate 15, and the upper end surface of the holder 60 is excluding the tapered portion 62. It will be in the state which continues horizontally with the upper end face of movable mold 13.

  In such a state, the inner surface of the molded product P is molded by the upper end surface including the tapered portion 62 of the holder 60 and the upper end surface of the movable mold 13, and the outer surface of the molded product P is molded by the lower end surface of the fixed mold 12. . In the holder 60, the slider 40 is positioned on the lowermost side with respect to the inclined upper edge of the base member 50, and the undercut molding core 30 that is integrally supported by the slider 40 is formed in the through hole of the holder 60. The undercut portion P1 is formed by protruding outward from 63.

  As shown in FIG. 2, when the molding is finished and the fixed mold 12 is separated from the movable mold 13, the ejector base plate 15 is driven upward. Then, each ejector pin 20 erected on the ejector base plate 15 protrudes upward while penetrating the bottom of the movable mold 13 to drive the holder 60 in the mold release direction.

  At this time, in the internal space 61 of the holder 60, the slider 40 connected to the first lateral groove 65 of the connecting member 64 on the ceiling side is pulled upward. As a result, the slider 40 is guided in the escape direction by the first lateral groove 65 which is the first guide means with respect to the holder 60 while moving in the die-cutting direction, and at the same time, the second guide for the base member 50. It is guided in the inclination direction by the second ridge 51 as means. Thereby, even when the relief direction of the concavo-convex shape of the outer surface or the inner surface of the molded product P and the relief direction of the undercut portion P1 are different from each other, the die can be easily punched.

  Further, according to the fitting relationship with the first and second guide means described above at the upper and lower ends of the slider 40, the slider 40 can be reliably and smoothly guided from the molding position to the release position within the holder 60. In addition, since the load at the time of punching out the molded product P is also distributed without being concentrated in one place, the durability is improved. In addition, since high accuracy at the time of design is eased, further cost reduction is possible.

  Furthermore, the undercut molding core 30 and the slider 40 can be concentrated on the movable die 13 via the base member 50 and the holder 60 without being dispersed on the ejector base plate 15 and the movable die 13. As a result, the entire molding die apparatus 10 can be configured in a compact manner, and a space-saving request can be met, and processing and incorporation into the die 11 are facilitated. In particular, the undercut processing mechanism can be configured as a unit in the form of being previously incorporated in the holder 60.

  In FIG. 2, when the molded product P is removed, as each ejector pin 20 returns to the molding position, the slider 40 and the undercut molding core 30 together with the holder 60 are pulled to the initial position. Return. Further, the fixed mold 12 also returns to the molding position, and the next molded product P is molded. In addition, what is necessary is just to design the specific length of the holder 60 or the slider 40 according to the stroke which can be die-cut of the whole molded article P including the undercut part P1.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention. For example, the specific shapes of the molded product P, the holder 60, and the undercut molded core 30 are not limited to those illustrated. Moreover, in the said embodiment, although the holder 60 is provided in the movable mold | type 13, you may comprise so that it can provide not the movable mold | type 13 but the fixed mold | type 12 so that it can drive in a die-drawing direction.

  Since it can be configured compactly and can meet the demands for space saving, it is excellent in processing and incorporation into small molds, especially the relief direction and underside of the uneven shape on the outer surface or inner surface of the molded product The present invention can be applied to cases where the escape directions of the cut portions are different from each other.

P ... Molded product P1 ... Undercut part P2 ... Corner part 10 ... Molding device 11 ... Mold 12 ... Fixed mold 13 ... Movable mold 13a ... Storage part 14 ... Movable mounting plate 15 ... Ejector base plate 20 ... Ejector pin DESCRIPTION OF SYMBOLS 21 ... Knock pin 22 ... Base end part 23 ... Tip part 30 ... Undercut molding core 40 ... Slider 41 ... 2nd oblique groove 42 ... 1st horizontal strip 50 ... Base member 51 ... 2nd oblique strip 60 ... Holder 61 ... Internal space 62 ... Tapered portion 63 ... Through hole 64 ... Connecting member 65 ... First lateral groove

Claims (5)

An undercut processing mechanism that enables a mold to be formed in an undercut portion that is recessed in a direction intersecting with a mold release direction of a molded product in a mold including a fixed mold and a movable mold,
An undercut molding core for molding the undercut part;
A slider that supports the undercut molded core;
A base member fixed to the movable mold and movably connecting the slider;
Provided on the movable mold and driven so as to be movable in the die-cutting direction of the molded product in a state of surrounding the slider, molding a part of the inner surface of the molded product, and causing the undercut molding core to appear and disappear outside A holder having a through hole formed therein,
Provided in the holder is a first guide means for movably guiding the slider in an escape direction that intersects with the die-cutting direction and the undercut portion enters the holder from the through hole,
When the slider is pulled by the base member through the first guide means as the holder is driven in the mold drawing direction, the slider moves in an inclined direction that simultaneously moves in the mold drawing direction and the relief direction. An undercut processing mechanism characterized in that second guide means for guiding is provided.   The holder surrounds the slider together with the base member, and is externally fitted to the base member so as to be movable in the die-cutting direction, and is guided by the base member when driven in the die-cutting direction. The undercut processing mechanism according to claim 1. A first lateral groove extending in the clearance direction in which the slider is movable with respect to the holder is provided in one of the holder and the slider,
In either one of them, a first horizontal strip that extends in the escape direction and is slidably fitted in the first horizontal groove is provided,
The undercut processing mechanism according to claim 1 or 2, wherein the first horizontal groove or the first horizontal strip in the holder is the first guide means. Either one of the base member and the slider is provided with a second oblique groove extending in the inclined direction in which the slider is movable with respect to the base member,
In either one of them, a second oblique line that extends in the inclined direction and fits slidably into the second oblique groove is provided,
4. The undercut processing mechanism according to claim 1, wherein the second oblique groove or the second oblique line in the base member serves as the second guide means. 5. It has an ejector pin that is driven in the die-cutting direction and protrudes, and the holder is fixed to the tip of the ejector pin,
The undercut processing mechanism according to claim 1, 2, 3, or 4, wherein the holder is driven by an ejecting operation of the ejector pin.

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